blob: 966763d735e9f34164a32d85b15ae9d8c0081f1a [file] [log] [blame]
Chuck Levera246b012005-08-11 16:25:23 -04001/*
2 * linux/net/sunrpc/xprtsock.c
3 *
4 * Client-side transport implementation for sockets.
5 *
Alan Cox113aa832008-10-13 19:01:08 -07006 * TCP callback races fixes (C) 1998 Red Hat
7 * TCP send fixes (C) 1998 Red Hat
Chuck Levera246b012005-08-11 16:25:23 -04008 * TCP NFS related read + write fixes
9 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
10 *
11 * Rewrite of larges part of the code in order to stabilize TCP stuff.
12 * Fix behaviour when socket buffer is full.
13 * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
Chuck Lever55aa4f52005-08-11 16:25:47 -040014 *
15 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
Chuck Lever8f9d5b12007-08-06 11:57:53 -040016 *
17 * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
18 * <gilles.quillard@bull.net>
Chuck Levera246b012005-08-11 16:25:23 -040019 */
20
21#include <linux/types.h>
Chuck Lever176e21e2011-05-09 15:22:44 -040022#include <linux/string.h>
Chuck Levera246b012005-08-11 16:25:23 -040023#include <linux/slab.h>
\"Talpey, Thomas\bc255712007-09-10 13:46:39 -040024#include <linux/module.h>
Chuck Levera246b012005-08-11 16:25:23 -040025#include <linux/capability.h>
Chuck Levera246b012005-08-11 16:25:23 -040026#include <linux/pagemap.h>
27#include <linux/errno.h>
28#include <linux/socket.h>
29#include <linux/in.h>
30#include <linux/net.h>
31#include <linux/mm.h>
Chuck Lever176e21e2011-05-09 15:22:44 -040032#include <linux/un.h>
Chuck Levera246b012005-08-11 16:25:23 -040033#include <linux/udp.h>
34#include <linux/tcp.h>
35#include <linux/sunrpc/clnt.h>
Jeff Layton59766872013-02-04 12:50:00 -050036#include <linux/sunrpc/addr.h>
Chuck Lever02107142006-01-03 09:55:49 +010037#include <linux/sunrpc/sched.h>
Rahul Iyer4cfc7e62009-09-10 17:32:28 +030038#include <linux/sunrpc/svcsock.h>
\"Talpey, Thomas\49c36fc2007-09-10 13:47:31 -040039#include <linux/sunrpc/xprtsock.h>
Chuck Levera246b012005-08-11 16:25:23 -040040#include <linux/file.h>
Trond Myklebust9e00abc2011-07-13 19:20:49 -040041#ifdef CONFIG_SUNRPC_BACKCHANNEL
Ricardo Labiaga44b98ef2009-04-01 09:23:02 -040042#include <linux/sunrpc/bc_xprt.h>
43#endif
Chuck Levera246b012005-08-11 16:25:23 -040044
45#include <net/sock.h>
46#include <net/checksum.h>
47#include <net/udp.h>
48#include <net/tcp.h>
49
Trond Myklebust40b5ea02013-09-04 12:16:23 -040050#include <trace/events/sunrpc.h>
51
Rahul Iyer4cfc7e62009-09-10 17:32:28 +030052#include "sunrpc.h"
Chuck Lever176e21e2011-05-09 15:22:44 -040053
54static void xs_close(struct rpc_xprt *xprt);
55
Chuck Lever9903cd12005-08-11 16:25:26 -040056/*
Chuck Leverc556b752005-11-01 12:24:48 -050057 * xprtsock tunables
58 */
Trond Myklebust09acfea2012-03-11 15:22:54 -040059static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
60static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
61static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
Chuck Leverc556b752005-11-01 12:24:48 -050062
Trond Myklebust09acfea2012-03-11 15:22:54 -040063static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
64static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
Chuck Leverc556b752005-11-01 12:24:48 -050065
Trond Myklebust7d1e8252009-03-11 14:38:03 -040066#define XS_TCP_LINGER_TO (15U * HZ)
Trond Myklebust25fe6142009-03-11 14:38:03 -040067static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
Trond Myklebust7d1e8252009-03-11 14:38:03 -040068
Chuck Leverc556b752005-11-01 12:24:48 -050069/*
Chuck Leverfbf76682006-12-05 16:35:54 -050070 * We can register our own files under /proc/sys/sunrpc by
71 * calling register_sysctl_table() again. The files in that
72 * directory become the union of all files registered there.
73 *
74 * We simply need to make sure that we don't collide with
75 * someone else's file names!
76 */
77
78#ifdef RPC_DEBUG
79
80static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
81static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
Trond Myklebustd9ba1312011-07-17 18:11:30 -040082static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
Chuck Leverfbf76682006-12-05 16:35:54 -050083static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
84static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
85
86static struct ctl_table_header *sunrpc_table_header;
87
88/*
89 * FIXME: changing the UDP slot table size should also resize the UDP
90 * socket buffers for existing UDP transports
91 */
Joe Perchesfe2c6332013-06-11 23:04:25 -070092static struct ctl_table xs_tunables_table[] = {
Chuck Leverfbf76682006-12-05 16:35:54 -050093 {
Chuck Leverfbf76682006-12-05 16:35:54 -050094 .procname = "udp_slot_table_entries",
95 .data = &xprt_udp_slot_table_entries,
96 .maxlen = sizeof(unsigned int),
97 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -080098 .proc_handler = proc_dointvec_minmax,
Chuck Leverfbf76682006-12-05 16:35:54 -050099 .extra1 = &min_slot_table_size,
100 .extra2 = &max_slot_table_size
101 },
102 {
Chuck Leverfbf76682006-12-05 16:35:54 -0500103 .procname = "tcp_slot_table_entries",
104 .data = &xprt_tcp_slot_table_entries,
105 .maxlen = sizeof(unsigned int),
106 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800107 .proc_handler = proc_dointvec_minmax,
Chuck Leverfbf76682006-12-05 16:35:54 -0500108 .extra1 = &min_slot_table_size,
109 .extra2 = &max_slot_table_size
110 },
111 {
Trond Myklebustd9ba1312011-07-17 18:11:30 -0400112 .procname = "tcp_max_slot_table_entries",
113 .data = &xprt_max_tcp_slot_table_entries,
114 .maxlen = sizeof(unsigned int),
115 .mode = 0644,
116 .proc_handler = proc_dointvec_minmax,
117 .extra1 = &min_slot_table_size,
118 .extra2 = &max_tcp_slot_table_limit
119 },
120 {
Chuck Leverfbf76682006-12-05 16:35:54 -0500121 .procname = "min_resvport",
122 .data = &xprt_min_resvport,
123 .maxlen = sizeof(unsigned int),
124 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800125 .proc_handler = proc_dointvec_minmax,
Chuck Leverfbf76682006-12-05 16:35:54 -0500126 .extra1 = &xprt_min_resvport_limit,
127 .extra2 = &xprt_max_resvport_limit
128 },
129 {
Chuck Leverfbf76682006-12-05 16:35:54 -0500130 .procname = "max_resvport",
131 .data = &xprt_max_resvport,
132 .maxlen = sizeof(unsigned int),
133 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800134 .proc_handler = proc_dointvec_minmax,
Chuck Leverfbf76682006-12-05 16:35:54 -0500135 .extra1 = &xprt_min_resvport_limit,
136 .extra2 = &xprt_max_resvport_limit
137 },
138 {
Trond Myklebust25fe6142009-03-11 14:38:03 -0400139 .procname = "tcp_fin_timeout",
140 .data = &xs_tcp_fin_timeout,
141 .maxlen = sizeof(xs_tcp_fin_timeout),
142 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800143 .proc_handler = proc_dointvec_jiffies,
Trond Myklebust25fe6142009-03-11 14:38:03 -0400144 },
Eric W. Biedermanf8572d82009-11-05 13:32:03 -0800145 { },
Chuck Leverfbf76682006-12-05 16:35:54 -0500146};
147
Joe Perchesfe2c6332013-06-11 23:04:25 -0700148static struct ctl_table sunrpc_table[] = {
Chuck Leverfbf76682006-12-05 16:35:54 -0500149 {
Chuck Leverfbf76682006-12-05 16:35:54 -0500150 .procname = "sunrpc",
151 .mode = 0555,
152 .child = xs_tunables_table
153 },
Eric W. Biedermanf8572d82009-11-05 13:32:03 -0800154 { },
Chuck Leverfbf76682006-12-05 16:35:54 -0500155};
156
157#endif
158
159/*
Chuck Lever03bf4b72005-08-25 16:25:55 -0700160 * Wait duration for a reply from the RPC portmapper.
161 */
162#define XS_BIND_TO (60U * HZ)
163
164/*
165 * Delay if a UDP socket connect error occurs. This is most likely some
166 * kind of resource problem on the local host.
167 */
168#define XS_UDP_REEST_TO (2U * HZ)
169
170/*
171 * The reestablish timeout allows clients to delay for a bit before attempting
172 * to reconnect to a server that just dropped our connection.
173 *
174 * We implement an exponential backoff when trying to reestablish a TCP
175 * transport connection with the server. Some servers like to drop a TCP
176 * connection when they are overworked, so we start with a short timeout and
177 * increase over time if the server is down or not responding.
178 */
179#define XS_TCP_INIT_REEST_TO (3U * HZ)
180#define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
181
182/*
183 * TCP idle timeout; client drops the transport socket if it is idle
184 * for this long. Note that we also timeout UDP sockets to prevent
185 * holding port numbers when there is no RPC traffic.
186 */
187#define XS_IDLE_DISC_TO (5U * 60 * HZ)
188
Chuck Levera246b012005-08-11 16:25:23 -0400189#ifdef RPC_DEBUG
190# undef RPC_DEBUG_DATA
Chuck Lever9903cd12005-08-11 16:25:26 -0400191# define RPCDBG_FACILITY RPCDBG_TRANS
Chuck Levera246b012005-08-11 16:25:23 -0400192#endif
193
Chuck Levera246b012005-08-11 16:25:23 -0400194#ifdef RPC_DEBUG_DATA
Chuck Lever9903cd12005-08-11 16:25:26 -0400195static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
Chuck Levera246b012005-08-11 16:25:23 -0400196{
Chuck Lever9903cd12005-08-11 16:25:26 -0400197 u8 *buf = (u8 *) packet;
198 int j;
Chuck Levera246b012005-08-11 16:25:23 -0400199
Chuck Lever46121cf2007-01-31 12:14:08 -0500200 dprintk("RPC: %s\n", msg);
Chuck Levera246b012005-08-11 16:25:23 -0400201 for (j = 0; j < count && j < 128; j += 4) {
202 if (!(j & 31)) {
203 if (j)
204 dprintk("\n");
205 dprintk("0x%04x ", j);
206 }
207 dprintk("%02x%02x%02x%02x ",
208 buf[j], buf[j+1], buf[j+2], buf[j+3]);
209 }
210 dprintk("\n");
211}
212#else
Chuck Lever9903cd12005-08-11 16:25:26 -0400213static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
Chuck Levera246b012005-08-11 16:25:23 -0400214{
215 /* NOP */
216}
217#endif
218
Chuck Leverffc2e512006-12-05 16:35:11 -0500219struct sock_xprt {
220 struct rpc_xprt xprt;
Chuck Leveree0ac0c2006-12-05 16:35:15 -0500221
222 /*
223 * Network layer
224 */
225 struct socket * sock;
226 struct sock * inet;
Chuck Lever51971132006-12-05 16:35:19 -0500227
228 /*
229 * State of TCP reply receive
230 */
231 __be32 tcp_fraghdr,
Trond Myklebustb76ce562010-06-16 13:57:32 -0400232 tcp_xid,
233 tcp_calldir;
Chuck Lever51971132006-12-05 16:35:19 -0500234
235 u32 tcp_offset,
236 tcp_reclen;
237
238 unsigned long tcp_copied,
239 tcp_flags;
Chuck Leverc8475462006-12-05 16:35:26 -0500240
241 /*
242 * Connection of transports
243 */
Trond Myklebust34161db2006-12-07 15:48:15 -0500244 struct delayed_work connect_worker;
Chuck Leverfbfffbd2009-08-09 15:09:46 -0400245 struct sockaddr_storage srcaddr;
246 unsigned short srcport;
Chuck Lever7c6e0662006-12-05 16:35:30 -0500247
248 /*
249 * UDP socket buffer size parameters
250 */
251 size_t rcvsize,
252 sndsize;
Chuck Lever314dfd72006-12-05 16:35:34 -0500253
254 /*
255 * Saved socket callback addresses
256 */
257 void (*old_data_ready)(struct sock *, int);
258 void (*old_state_change)(struct sock *);
259 void (*old_write_space)(struct sock *);
Trond Myklebust21180712013-12-31 13:22:59 -0500260 void (*old_error_report)(struct sock *);
Chuck Leverffc2e512006-12-05 16:35:11 -0500261};
262
Chuck Levere136d092006-12-05 16:35:23 -0500263/*
264 * TCP receive state flags
265 */
266#define TCP_RCV_LAST_FRAG (1UL << 0)
267#define TCP_RCV_COPY_FRAGHDR (1UL << 1)
268#define TCP_RCV_COPY_XID (1UL << 2)
269#define TCP_RCV_COPY_DATA (1UL << 3)
Ricardo Labiagaf4a2e412009-04-01 09:22:54 -0400270#define TCP_RCV_READ_CALLDIR (1UL << 4)
271#define TCP_RCV_COPY_CALLDIR (1UL << 5)
Ricardo Labiaga18dca022009-04-01 09:22:53 -0400272
273/*
274 * TCP RPC flags
275 */
Ricardo Labiagaf4a2e412009-04-01 09:22:54 -0400276#define TCP_RPC_REPLY (1UL << 6)
Chuck Levere136d092006-12-05 16:35:23 -0500277
Trond Myklebust21180712013-12-31 13:22:59 -0500278static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
279{
280 return (struct rpc_xprt *) sk->sk_user_data;
281}
282
Chuck Lever95392c52007-08-06 11:57:58 -0400283static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
Chuck Leveredb267a2006-08-22 20:06:18 -0400284{
Chuck Lever95392c52007-08-06 11:57:58 -0400285 return (struct sockaddr *) &xprt->addr;
286}
287
Chuck Lever176e21e2011-05-09 15:22:44 -0400288static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
289{
290 return (struct sockaddr_un *) &xprt->addr;
291}
292
Chuck Lever95392c52007-08-06 11:57:58 -0400293static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
294{
295 return (struct sockaddr_in *) &xprt->addr;
296}
297
298static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
299{
300 return (struct sockaddr_in6 *) &xprt->addr;
301}
302
Chuck Leverc877b842009-08-09 15:09:36 -0400303static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
Chuck Leveredb267a2006-08-22 20:06:18 -0400304{
Chuck Leverc877b842009-08-09 15:09:36 -0400305 struct sockaddr *sap = xs_addr(xprt);
Chuck Lever9dc3b092009-08-09 15:09:46 -0400306 struct sockaddr_in6 *sin6;
307 struct sockaddr_in *sin;
Chuck Lever176e21e2011-05-09 15:22:44 -0400308 struct sockaddr_un *sun;
Chuck Leverc877b842009-08-09 15:09:36 -0400309 char buf[128];
Chuck Leveredb267a2006-08-22 20:06:18 -0400310
Chuck Lever9dc3b092009-08-09 15:09:46 -0400311 switch (sap->sa_family) {
Chuck Lever176e21e2011-05-09 15:22:44 -0400312 case AF_LOCAL:
313 sun = xs_addr_un(xprt);
314 strlcpy(buf, sun->sun_path, sizeof(buf));
315 xprt->address_strings[RPC_DISPLAY_ADDR] =
316 kstrdup(buf, GFP_KERNEL);
317 break;
Chuck Lever9dc3b092009-08-09 15:09:46 -0400318 case AF_INET:
Chuck Lever176e21e2011-05-09 15:22:44 -0400319 (void)rpc_ntop(sap, buf, sizeof(buf));
320 xprt->address_strings[RPC_DISPLAY_ADDR] =
321 kstrdup(buf, GFP_KERNEL);
Chuck Lever9dc3b092009-08-09 15:09:46 -0400322 sin = xs_addr_in(xprt);
Joe Perchesfc0b57912010-03-08 12:15:28 -0800323 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
Chuck Lever9dc3b092009-08-09 15:09:46 -0400324 break;
325 case AF_INET6:
Chuck Lever176e21e2011-05-09 15:22:44 -0400326 (void)rpc_ntop(sap, buf, sizeof(buf));
327 xprt->address_strings[RPC_DISPLAY_ADDR] =
328 kstrdup(buf, GFP_KERNEL);
Chuck Lever9dc3b092009-08-09 15:09:46 -0400329 sin6 = xs_addr_in6(xprt);
Joe Perchesfc0b57912010-03-08 12:15:28 -0800330 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
Chuck Lever9dc3b092009-08-09 15:09:46 -0400331 break;
332 default:
333 BUG();
Chuck Leveredb267a2006-08-22 20:06:18 -0400334 }
Chuck Lever176e21e2011-05-09 15:22:44 -0400335
Chuck Lever9dc3b092009-08-09 15:09:46 -0400336 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
Chuck Leveredb267a2006-08-22 20:06:18 -0400337}
338
Chuck Lever9dc3b092009-08-09 15:09:46 -0400339static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
Chuck Lever4b6473f2007-08-06 11:57:12 -0400340{
Chuck Lever9dc3b092009-08-09 15:09:46 -0400341 struct sockaddr *sap = xs_addr(xprt);
342 char buf[128];
Chuck Lever4b6473f2007-08-06 11:57:12 -0400343
Joe Perches81160e662010-03-08 12:15:59 -0800344 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
Chuck Leverc877b842009-08-09 15:09:36 -0400345 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
Chuck Lever4b6473f2007-08-06 11:57:12 -0400346
Joe Perches81160e662010-03-08 12:15:59 -0800347 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
Chuck Leverc877b842009-08-09 15:09:36 -0400348 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
349}
Chuck Lever4b6473f2007-08-06 11:57:12 -0400350
Chuck Lever9dc3b092009-08-09 15:09:46 -0400351static void xs_format_peer_addresses(struct rpc_xprt *xprt,
352 const char *protocol,
353 const char *netid)
Chuck Leveredb267a2006-08-22 20:06:18 -0400354{
Chuck Leverb454ae92008-01-07 18:34:48 -0500355 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
Chuck Leverb454ae92008-01-07 18:34:48 -0500356 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
Chuck Leverc877b842009-08-09 15:09:36 -0400357 xs_format_common_peer_addresses(xprt);
Chuck Lever9dc3b092009-08-09 15:09:46 -0400358 xs_format_common_peer_ports(xprt);
Chuck Lever4b6473f2007-08-06 11:57:12 -0400359}
360
Chuck Lever9dc3b092009-08-09 15:09:46 -0400361static void xs_update_peer_port(struct rpc_xprt *xprt)
Chuck Lever4b6473f2007-08-06 11:57:12 -0400362{
Chuck Lever9dc3b092009-08-09 15:09:46 -0400363 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
364 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
Chuck Lever4b6473f2007-08-06 11:57:12 -0400365
Chuck Lever9dc3b092009-08-09 15:09:46 -0400366 xs_format_common_peer_ports(xprt);
Chuck Leveredb267a2006-08-22 20:06:18 -0400367}
368
369static void xs_free_peer_addresses(struct rpc_xprt *xprt)
370{
Chuck Lever33e01dc2008-01-14 12:32:20 -0500371 unsigned int i;
372
373 for (i = 0; i < RPC_DISPLAY_MAX; i++)
374 switch (i) {
375 case RPC_DISPLAY_PROTO:
376 case RPC_DISPLAY_NETID:
377 continue;
378 default:
379 kfree(xprt->address_strings[i]);
380 }
Chuck Leveredb267a2006-08-22 20:06:18 -0400381}
382
Chuck Leverb4b5cc82005-08-11 16:25:29 -0400383#define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
384
Trond Myklebust24c56842006-10-17 15:06:22 -0400385static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
Chuck Leverb4b5cc82005-08-11 16:25:29 -0400386{
Chuck Leverb4b5cc82005-08-11 16:25:29 -0400387 struct msghdr msg = {
388 .msg_name = addr,
389 .msg_namelen = addrlen,
Trond Myklebust24c56842006-10-17 15:06:22 -0400390 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
391 };
392 struct kvec iov = {
393 .iov_base = vec->iov_base + base,
394 .iov_len = vec->iov_len - base,
Chuck Leverb4b5cc82005-08-11 16:25:29 -0400395 };
396
Trond Myklebust24c56842006-10-17 15:06:22 -0400397 if (iov.iov_len != 0)
Chuck Leverb4b5cc82005-08-11 16:25:29 -0400398 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
399 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
400}
401
Trond Myklebusta6b31d12013-11-08 16:03:50 -0500402static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more, bool zerocopy)
Chuck Leverb4b5cc82005-08-11 16:25:29 -0400403{
Trond Myklebusta6b31d12013-11-08 16:03:50 -0500404 ssize_t (*do_sendpage)(struct socket *sock, struct page *page,
405 int offset, size_t size, int flags);
Trond Myklebust24c56842006-10-17 15:06:22 -0400406 struct page **ppage;
407 unsigned int remainder;
408 int err, sent = 0;
Chuck Leverb4b5cc82005-08-11 16:25:29 -0400409
Trond Myklebust24c56842006-10-17 15:06:22 -0400410 remainder = xdr->page_len - base;
411 base += xdr->page_base;
412 ppage = xdr->pages + (base >> PAGE_SHIFT);
413 base &= ~PAGE_MASK;
Trond Myklebusta6b31d12013-11-08 16:03:50 -0500414 do_sendpage = sock->ops->sendpage;
415 if (!zerocopy)
416 do_sendpage = sock_no_sendpage;
Trond Myklebust24c56842006-10-17 15:06:22 -0400417 for(;;) {
418 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
419 int flags = XS_SENDMSG_FLAGS;
420
421 remainder -= len;
422 if (remainder != 0 || more)
423 flags |= MSG_MORE;
Trond Myklebusta6b31d12013-11-08 16:03:50 -0500424 err = do_sendpage(sock, *ppage, base, len, flags);
Trond Myklebust24c56842006-10-17 15:06:22 -0400425 if (remainder == 0 || err != len)
426 break;
427 sent += err;
428 ppage++;
429 base = 0;
430 }
431 if (sent == 0)
432 return err;
433 if (err > 0)
434 sent += err;
435 return sent;
Chuck Leverb4b5cc82005-08-11 16:25:29 -0400436}
437
Chuck Lever9903cd12005-08-11 16:25:26 -0400438/**
439 * xs_sendpages - write pages directly to a socket
440 * @sock: socket to send on
441 * @addr: UDP only -- address of destination
442 * @addrlen: UDP only -- length of destination address
443 * @xdr: buffer containing this request
444 * @base: starting position in the buffer
Trond Myklebusta6b31d12013-11-08 16:03:50 -0500445 * @zerocopy: true if it is safe to use sendpage()
Chuck Lever9903cd12005-08-11 16:25:26 -0400446 *
Chuck Levera246b012005-08-11 16:25:23 -0400447 */
Trond Myklebusta6b31d12013-11-08 16:03:50 -0500448static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, bool zerocopy)
Chuck Levera246b012005-08-11 16:25:23 -0400449{
Trond Myklebust24c56842006-10-17 15:06:22 -0400450 unsigned int remainder = xdr->len - base;
451 int err, sent = 0;
Chuck Levera246b012005-08-11 16:25:23 -0400452
Chuck Lever262965f2005-08-11 16:25:56 -0400453 if (unlikely(!sock))
Trond Myklebustfba91af2009-03-11 14:06:41 -0400454 return -ENOTSOCK;
Chuck Lever262965f2005-08-11 16:25:56 -0400455
456 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
Trond Myklebust24c56842006-10-17 15:06:22 -0400457 if (base != 0) {
458 addr = NULL;
459 addrlen = 0;
460 }
Chuck Lever262965f2005-08-11 16:25:56 -0400461
Trond Myklebust24c56842006-10-17 15:06:22 -0400462 if (base < xdr->head[0].iov_len || addr != NULL) {
463 unsigned int len = xdr->head[0].iov_len - base;
464 remainder -= len;
465 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
466 if (remainder == 0 || err != len)
Chuck Levera246b012005-08-11 16:25:23 -0400467 goto out;
Trond Myklebust24c56842006-10-17 15:06:22 -0400468 sent += err;
Chuck Levera246b012005-08-11 16:25:23 -0400469 base = 0;
470 } else
Trond Myklebust24c56842006-10-17 15:06:22 -0400471 base -= xdr->head[0].iov_len;
Chuck Levera246b012005-08-11 16:25:23 -0400472
Trond Myklebust24c56842006-10-17 15:06:22 -0400473 if (base < xdr->page_len) {
474 unsigned int len = xdr->page_len - base;
475 remainder -= len;
Trond Myklebusta6b31d12013-11-08 16:03:50 -0500476 err = xs_send_pagedata(sock, xdr, base, remainder != 0, zerocopy);
Trond Myklebust24c56842006-10-17 15:06:22 -0400477 if (remainder == 0 || err != len)
Chuck Levera246b012005-08-11 16:25:23 -0400478 goto out;
Trond Myklebust24c56842006-10-17 15:06:22 -0400479 sent += err;
Chuck Levera246b012005-08-11 16:25:23 -0400480 base = 0;
Trond Myklebust24c56842006-10-17 15:06:22 -0400481 } else
482 base -= xdr->page_len;
483
484 if (base >= xdr->tail[0].iov_len)
485 return sent;
486 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
Chuck Levera246b012005-08-11 16:25:23 -0400487out:
Trond Myklebust24c56842006-10-17 15:06:22 -0400488 if (sent == 0)
489 return err;
490 if (err > 0)
491 sent += err;
492 return sent;
Chuck Levera246b012005-08-11 16:25:23 -0400493}
494
Trond Myklebustb6ddf642008-04-17 18:52:19 -0400495static void xs_nospace_callback(struct rpc_task *task)
496{
497 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
498
499 transport->inet->sk_write_pending--;
500 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
501}
502
Chuck Lever9903cd12005-08-11 16:25:26 -0400503/**
Chuck Lever262965f2005-08-11 16:25:56 -0400504 * xs_nospace - place task on wait queue if transmit was incomplete
505 * @task: task to put to sleep
Chuck Lever9903cd12005-08-11 16:25:26 -0400506 *
Chuck Levera246b012005-08-11 16:25:23 -0400507 */
Trond Myklebust5e3771c2009-03-11 14:38:01 -0400508static int xs_nospace(struct rpc_task *task)
Chuck Levera246b012005-08-11 16:25:23 -0400509{
Chuck Lever262965f2005-08-11 16:25:56 -0400510 struct rpc_rqst *req = task->tk_rqstp;
511 struct rpc_xprt *xprt = req->rq_xprt;
Chuck Leveree0ac0c2006-12-05 16:35:15 -0500512 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
Trond Myklebust06ea0bf2014-02-11 09:15:54 -0500513 struct sock *sk = transport->inet;
Trond Myklebust24ca9a82011-11-22 14:44:28 +0200514 int ret = -EAGAIN;
Chuck Levera246b012005-08-11 16:25:23 -0400515
Chuck Lever46121cf2007-01-31 12:14:08 -0500516 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
Chuck Lever262965f2005-08-11 16:25:56 -0400517 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
518 req->rq_slen);
519
Trond Myklebustb6ddf642008-04-17 18:52:19 -0400520 /* Protect against races with write_space */
521 spin_lock_bh(&xprt->transport_lock);
Chuck Lever262965f2005-08-11 16:25:56 -0400522
Trond Myklebustb6ddf642008-04-17 18:52:19 -0400523 /* Don't race with disconnect */
524 if (xprt_connected(xprt)) {
525 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
526 /*
527 * Notify TCP that we're limited by the application
528 * window size
529 */
530 set_bit(SOCK_NOSPACE, &transport->sock->flags);
Trond Myklebust06ea0bf2014-02-11 09:15:54 -0500531 sk->sk_write_pending++;
Trond Myklebustb6ddf642008-04-17 18:52:19 -0400532 /* ...and wait for more buffer space */
533 xprt_wait_for_buffer_space(task, xs_nospace_callback);
534 }
535 } else {
536 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
Trond Myklebust5e3771c2009-03-11 14:38:01 -0400537 ret = -ENOTCONN;
Trond Myklebustb6ddf642008-04-17 18:52:19 -0400538 }
Chuck Lever262965f2005-08-11 16:25:56 -0400539
Trond Myklebustb6ddf642008-04-17 18:52:19 -0400540 spin_unlock_bh(&xprt->transport_lock);
Trond Myklebust06ea0bf2014-02-11 09:15:54 -0500541
542 /* Race breaker in case memory is freed before above code is called */
543 sk->sk_write_space(sk);
Trond Myklebust5e3771c2009-03-11 14:38:01 -0400544 return ret;
Chuck Lever262965f2005-08-11 16:25:56 -0400545}
546
Chuck Lever61677ee2011-05-09 15:22:34 -0400547/*
548 * Construct a stream transport record marker in @buf.
549 */
550static inline void xs_encode_stream_record_marker(struct xdr_buf *buf)
551{
552 u32 reclen = buf->len - sizeof(rpc_fraghdr);
553 rpc_fraghdr *base = buf->head[0].iov_base;
554 *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen);
555}
556
Chuck Lever262965f2005-08-11 16:25:56 -0400557/**
Chuck Lever176e21e2011-05-09 15:22:44 -0400558 * xs_local_send_request - write an RPC request to an AF_LOCAL socket
559 * @task: RPC task that manages the state of an RPC request
560 *
561 * Return values:
562 * 0: The request has been sent
563 * EAGAIN: The socket was blocked, please call again later to
564 * complete the request
565 * ENOTCONN: Caller needs to invoke connect logic then call again
566 * other: Some other error occured, the request was not sent
567 */
568static int xs_local_send_request(struct rpc_task *task)
569{
570 struct rpc_rqst *req = task->tk_rqstp;
571 struct rpc_xprt *xprt = req->rq_xprt;
572 struct sock_xprt *transport =
573 container_of(xprt, struct sock_xprt, xprt);
574 struct xdr_buf *xdr = &req->rq_snd_buf;
575 int status;
576
577 xs_encode_stream_record_marker(&req->rq_snd_buf);
578
579 xs_pktdump("packet data:",
580 req->rq_svec->iov_base, req->rq_svec->iov_len);
581
582 status = xs_sendpages(transport->sock, NULL, 0,
Trond Myklebusta6b31d12013-11-08 16:03:50 -0500583 xdr, req->rq_bytes_sent, true);
Chuck Lever176e21e2011-05-09 15:22:44 -0400584 dprintk("RPC: %s(%u) = %d\n",
585 __func__, xdr->len - req->rq_bytes_sent, status);
586 if (likely(status >= 0)) {
587 req->rq_bytes_sent += status;
588 req->rq_xmit_bytes_sent += status;
589 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
590 req->rq_bytes_sent = 0;
591 return 0;
592 }
593 status = -EAGAIN;
594 }
595
596 switch (status) {
597 case -EAGAIN:
598 status = xs_nospace(task);
599 break;
600 default:
601 dprintk("RPC: sendmsg returned unrecognized error %d\n",
602 -status);
603 case -EPIPE:
604 xs_close(xprt);
605 status = -ENOTCONN;
606 }
607
608 return status;
609}
610
611/**
Chuck Lever262965f2005-08-11 16:25:56 -0400612 * xs_udp_send_request - write an RPC request to a UDP socket
613 * @task: address of RPC task that manages the state of an RPC request
614 *
615 * Return values:
616 * 0: The request has been sent
617 * EAGAIN: The socket was blocked, please call again later to
618 * complete the request
619 * ENOTCONN: Caller needs to invoke connect logic then call again
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300620 * other: Some other error occurred, the request was not sent
Chuck Lever262965f2005-08-11 16:25:56 -0400621 */
622static int xs_udp_send_request(struct rpc_task *task)
623{
624 struct rpc_rqst *req = task->tk_rqstp;
625 struct rpc_xprt *xprt = req->rq_xprt;
Chuck Leveree0ac0c2006-12-05 16:35:15 -0500626 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
Chuck Lever262965f2005-08-11 16:25:56 -0400627 struct xdr_buf *xdr = &req->rq_snd_buf;
628 int status;
Chuck Levera246b012005-08-11 16:25:23 -0400629
Chuck Lever9903cd12005-08-11 16:25:26 -0400630 xs_pktdump("packet data:",
Chuck Levera246b012005-08-11 16:25:23 -0400631 req->rq_svec->iov_base,
632 req->rq_svec->iov_len);
633
Trond Myklebust01d37c42009-03-11 14:09:39 -0400634 if (!xprt_bound(xprt))
635 return -ENOTCONN;
Chuck Leveree0ac0c2006-12-05 16:35:15 -0500636 status = xs_sendpages(transport->sock,
Chuck Lever95392c52007-08-06 11:57:58 -0400637 xs_addr(xprt),
Chuck Leveree0ac0c2006-12-05 16:35:15 -0500638 xprt->addrlen, xdr,
Trond Myklebusta6b31d12013-11-08 16:03:50 -0500639 req->rq_bytes_sent, true);
Chuck Levera246b012005-08-11 16:25:23 -0400640
Chuck Lever46121cf2007-01-31 12:14:08 -0500641 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
Chuck Lever262965f2005-08-11 16:25:56 -0400642 xdr->len - req->rq_bytes_sent, status);
Chuck Levera246b012005-08-11 16:25:23 -0400643
Trond Myklebust21997002007-10-01 11:43:37 -0400644 if (status >= 0) {
Trond Myklebustd60dbb22010-05-13 12:51:49 -0400645 req->rq_xmit_bytes_sent += status;
Trond Myklebust21997002007-10-01 11:43:37 -0400646 if (status >= req->rq_slen)
647 return 0;
648 /* Still some bytes left; set up for a retry later. */
Chuck Lever262965f2005-08-11 16:25:56 -0400649 status = -EAGAIN;
Trond Myklebust21997002007-10-01 11:43:37 -0400650 }
Chuck Levera246b012005-08-11 16:25:23 -0400651
Chuck Lever262965f2005-08-11 16:25:56 -0400652 switch (status) {
Trond Myklebustfba91af2009-03-11 14:06:41 -0400653 case -ENOTSOCK:
654 status = -ENOTCONN;
655 /* Should we call xs_close() here? */
656 break;
Trond Myklebustb6ddf642008-04-17 18:52:19 -0400657 case -EAGAIN:
Trond Myklebust5e3771c2009-03-11 14:38:01 -0400658 status = xs_nospace(task);
Trond Myklebustb6ddf642008-04-17 18:52:19 -0400659 break;
Trond Myklebustc8485e42009-03-11 14:37:59 -0400660 default:
661 dprintk("RPC: sendmsg returned unrecognized error %d\n",
662 -status);
Chuck Lever262965f2005-08-11 16:25:56 -0400663 case -ENETUNREACH:
664 case -EPIPE:
Chuck Levera246b012005-08-11 16:25:23 -0400665 case -ECONNREFUSED:
666 /* When the server has died, an ICMP port unreachable message
Chuck Lever9903cd12005-08-11 16:25:26 -0400667 * prompts ECONNREFUSED. */
Trond Myklebustb6ddf642008-04-17 18:52:19 -0400668 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
Chuck Levera246b012005-08-11 16:25:23 -0400669 }
Bian Naimeng5fe46e92010-03-08 14:49:01 +0800670
Chuck Lever262965f2005-08-11 16:25:56 -0400671 return status;
Chuck Levera246b012005-08-11 16:25:23 -0400672}
673
Trond Myklebuste06799f2007-11-05 15:44:12 -0500674/**
675 * xs_tcp_shutdown - gracefully shut down a TCP socket
676 * @xprt: transport
677 *
678 * Initiates a graceful shutdown of the TCP socket by calling the
679 * equivalent of shutdown(SHUT_WR);
680 */
681static void xs_tcp_shutdown(struct rpc_xprt *xprt)
682{
683 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
684 struct socket *sock = transport->sock;
685
Trond Myklebust40b5ea02013-09-04 12:16:23 -0400686 if (sock != NULL) {
Trond Myklebuste06799f2007-11-05 15:44:12 -0500687 kernel_sock_shutdown(sock, SHUT_WR);
Trond Myklebust40b5ea02013-09-04 12:16:23 -0400688 trace_rpc_socket_shutdown(xprt, sock);
689 }
Trond Myklebuste06799f2007-11-05 15:44:12 -0500690}
691
Chuck Lever9903cd12005-08-11 16:25:26 -0400692/**
Chuck Lever262965f2005-08-11 16:25:56 -0400693 * xs_tcp_send_request - write an RPC request to a TCP socket
Chuck Lever9903cd12005-08-11 16:25:26 -0400694 * @task: address of RPC task that manages the state of an RPC request
695 *
696 * Return values:
Chuck Lever262965f2005-08-11 16:25:56 -0400697 * 0: The request has been sent
698 * EAGAIN: The socket was blocked, please call again later to
699 * complete the request
700 * ENOTCONN: Caller needs to invoke connect logic then call again
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300701 * other: Some other error occurred, the request was not sent
Chuck Lever9903cd12005-08-11 16:25:26 -0400702 *
703 * XXX: In the case of soft timeouts, should we eventually give up
Chuck Lever262965f2005-08-11 16:25:56 -0400704 * if sendmsg is not able to make progress?
Chuck Lever9903cd12005-08-11 16:25:26 -0400705 */
Chuck Lever262965f2005-08-11 16:25:56 -0400706static int xs_tcp_send_request(struct rpc_task *task)
Chuck Levera246b012005-08-11 16:25:23 -0400707{
708 struct rpc_rqst *req = task->tk_rqstp;
709 struct rpc_xprt *xprt = req->rq_xprt;
Chuck Leveree0ac0c2006-12-05 16:35:15 -0500710 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
Chuck Lever262965f2005-08-11 16:25:56 -0400711 struct xdr_buf *xdr = &req->rq_snd_buf;
Trond Myklebusta6b31d12013-11-08 16:03:50 -0500712 bool zerocopy = true;
Chuck Leverb595bb12007-08-06 11:56:42 -0400713 int status;
Chuck Levera246b012005-08-11 16:25:23 -0400714
Chuck Lever61677ee2011-05-09 15:22:34 -0400715 xs_encode_stream_record_marker(&req->rq_snd_buf);
Chuck Levera246b012005-08-11 16:25:23 -0400716
Chuck Lever262965f2005-08-11 16:25:56 -0400717 xs_pktdump("packet data:",
718 req->rq_svec->iov_base,
719 req->rq_svec->iov_len);
Trond Myklebusta6b31d12013-11-08 16:03:50 -0500720 /* Don't use zero copy if this is a resend. If the RPC call
721 * completes while the socket holds a reference to the pages,
722 * then we may end up resending corrupted data.
723 */
724 if (task->tk_flags & RPC_TASK_SENT)
725 zerocopy = false;
Chuck Levera246b012005-08-11 16:25:23 -0400726
727 /* Continue transmitting the packet/record. We must be careful
728 * to cope with writespace callbacks arriving _after_ we have
Chuck Lever262965f2005-08-11 16:25:56 -0400729 * called sendmsg(). */
Chuck Levera246b012005-08-11 16:25:23 -0400730 while (1) {
Chuck Leveree0ac0c2006-12-05 16:35:15 -0500731 status = xs_sendpages(transport->sock,
Trond Myklebusta6b31d12013-11-08 16:03:50 -0500732 NULL, 0, xdr, req->rq_bytes_sent,
733 zerocopy);
Chuck Levera246b012005-08-11 16:25:23 -0400734
Chuck Lever46121cf2007-01-31 12:14:08 -0500735 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
Chuck Lever262965f2005-08-11 16:25:56 -0400736 xdr->len - req->rq_bytes_sent, status);
737
738 if (unlikely(status < 0))
Chuck Levera246b012005-08-11 16:25:23 -0400739 break;
740
Chuck Lever262965f2005-08-11 16:25:56 -0400741 /* If we've sent the entire packet, immediately
742 * reset the count of bytes sent. */
743 req->rq_bytes_sent += status;
Trond Myklebustd60dbb22010-05-13 12:51:49 -0400744 req->rq_xmit_bytes_sent += status;
Chuck Lever262965f2005-08-11 16:25:56 -0400745 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
746 req->rq_bytes_sent = 0;
747 return 0;
Chuck Levera246b012005-08-11 16:25:23 -0400748 }
749
Trond Myklebust06b4b682008-04-16 16:51:38 -0400750 if (status != 0)
751 continue;
Chuck Levera246b012005-08-11 16:25:23 -0400752 status = -EAGAIN;
Trond Myklebust06b4b682008-04-16 16:51:38 -0400753 break;
Chuck Levera246b012005-08-11 16:25:23 -0400754 }
755
Chuck Lever262965f2005-08-11 16:25:56 -0400756 switch (status) {
Trond Myklebustfba91af2009-03-11 14:06:41 -0400757 case -ENOTSOCK:
758 status = -ENOTCONN;
759 /* Should we call xs_close() here? */
760 break;
Chuck Lever262965f2005-08-11 16:25:56 -0400761 case -EAGAIN:
Trond Myklebust5e3771c2009-03-11 14:38:01 -0400762 status = xs_nospace(task);
Chuck Lever262965f2005-08-11 16:25:56 -0400763 break;
764 default:
Chuck Lever46121cf2007-01-31 12:14:08 -0500765 dprintk("RPC: sendmsg returned unrecognized error %d\n",
Chuck Lever262965f2005-08-11 16:25:56 -0400766 -status);
Chuck Lever262965f2005-08-11 16:25:56 -0400767 case -ECONNRESET:
Trond Myklebuste06799f2007-11-05 15:44:12 -0500768 xs_tcp_shutdown(xprt);
Chuck Lever262965f2005-08-11 16:25:56 -0400769 case -ECONNREFUSED:
770 case -ENOTCONN:
Trond Myklebustb9d2bb22012-10-23 11:40:02 -0400771 case -EPIPE:
Chuck Lever262965f2005-08-11 16:25:56 -0400772 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
Chuck Levera246b012005-08-11 16:25:23 -0400773 }
Bian Naimeng5fe46e92010-03-08 14:49:01 +0800774
Chuck Levera246b012005-08-11 16:25:23 -0400775 return status;
776}
777
Chuck Lever9903cd12005-08-11 16:25:26 -0400778/**
Trond Myklebuste0ab53d2006-07-27 17:22:50 -0400779 * xs_tcp_release_xprt - clean up after a tcp transmission
780 * @xprt: transport
781 * @task: rpc task
782 *
783 * This cleans up if an error causes us to abort the transmission of a request.
784 * In this case, the socket may need to be reset in order to avoid confusing
785 * the server.
786 */
787static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
788{
789 struct rpc_rqst *req;
790
791 if (task != xprt->snd_task)
792 return;
793 if (task == NULL)
794 goto out_release;
795 req = task->tk_rqstp;
Trond Myklebust43cedbf0e2011-07-17 16:01:03 -0400796 if (req == NULL)
797 goto out_release;
Trond Myklebuste0ab53d2006-07-27 17:22:50 -0400798 if (req->rq_bytes_sent == 0)
799 goto out_release;
800 if (req->rq_bytes_sent == req->rq_snd_buf.len)
801 goto out_release;
Trond Myklebusta4f08352013-01-08 09:10:21 -0500802 set_bit(XPRT_CLOSE_WAIT, &xprt->state);
Trond Myklebuste0ab53d2006-07-27 17:22:50 -0400803out_release:
804 xprt_release_xprt(xprt, task);
805}
806
Trond Myklebust2a9e1cf2008-10-28 15:21:39 -0400807static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
808{
809 transport->old_data_ready = sk->sk_data_ready;
810 transport->old_state_change = sk->sk_state_change;
811 transport->old_write_space = sk->sk_write_space;
Trond Myklebust21180712013-12-31 13:22:59 -0500812 transport->old_error_report = sk->sk_error_report;
Trond Myklebust2a9e1cf2008-10-28 15:21:39 -0400813}
814
815static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
816{
817 sk->sk_data_ready = transport->old_data_ready;
818 sk->sk_state_change = transport->old_state_change;
819 sk->sk_write_space = transport->old_write_space;
Trond Myklebust21180712013-12-31 13:22:59 -0500820 sk->sk_error_report = transport->old_error_report;
821}
822
823/**
824 * xs_error_report - callback to handle TCP socket state errors
825 * @sk: socket
826 *
827 * Note: we don't call sock_error() since there may be a rpc_task
828 * using the socket, and so we don't want to clear sk->sk_err.
829 */
830static void xs_error_report(struct sock *sk)
831{
832 struct rpc_xprt *xprt;
833 int err;
834
835 read_lock_bh(&sk->sk_callback_lock);
836 if (!(xprt = xprt_from_sock(sk)))
837 goto out;
838
839 err = -sk->sk_err;
840 if (err == 0)
841 goto out;
842 dprintk("RPC: xs_error_report client %p, error=%d...\n",
843 xprt, -err);
Trond Myklebuste8353c762013-12-31 13:39:22 -0500844 trace_rpc_socket_error(xprt, sk->sk_socket, err);
Trond Myklebust21180712013-12-31 13:22:59 -0500845 xprt_wake_pending_tasks(xprt, err);
846 out:
847 read_unlock_bh(&sk->sk_callback_lock);
Trond Myklebust2a9e1cf2008-10-28 15:21:39 -0400848}
849
Chuck Leverfe315e72009-03-11 14:10:21 -0400850static void xs_reset_transport(struct sock_xprt *transport)
Chuck Levera246b012005-08-11 16:25:23 -0400851{
Chuck Leveree0ac0c2006-12-05 16:35:15 -0500852 struct socket *sock = transport->sock;
853 struct sock *sk = transport->inet;
Chuck Levera246b012005-08-11 16:25:23 -0400854
Chuck Leverfe315e72009-03-11 14:10:21 -0400855 if (sk == NULL)
856 return;
Chuck Lever9903cd12005-08-11 16:25:26 -0400857
Trond Myklebust246408d2011-03-22 18:40:10 -0400858 transport->srcport = 0;
859
Chuck Levera246b012005-08-11 16:25:23 -0400860 write_lock_bh(&sk->sk_callback_lock);
Chuck Leveree0ac0c2006-12-05 16:35:15 -0500861 transport->inet = NULL;
862 transport->sock = NULL;
Chuck Levera246b012005-08-11 16:25:23 -0400863
Chuck Lever9903cd12005-08-11 16:25:26 -0400864 sk->sk_user_data = NULL;
Trond Myklebust2a9e1cf2008-10-28 15:21:39 -0400865
866 xs_restore_old_callbacks(transport, sk);
Chuck Levera246b012005-08-11 16:25:23 -0400867 write_unlock_bh(&sk->sk_callback_lock);
868
Chuck Lever9903cd12005-08-11 16:25:26 -0400869 sk->sk_no_check = 0;
Chuck Levera246b012005-08-11 16:25:23 -0400870
Trond Myklebust40b5ea02013-09-04 12:16:23 -0400871 trace_rpc_socket_close(&transport->xprt, sock);
Chuck Levera246b012005-08-11 16:25:23 -0400872 sock_release(sock);
Chuck Leverfe315e72009-03-11 14:10:21 -0400873}
874
875/**
876 * xs_close - close a socket
877 * @xprt: transport
878 *
879 * This is used when all requests are complete; ie, no DRC state remains
880 * on the server we want to save.
Trond Myklebustf75e6742009-04-21 17:18:20 -0400881 *
882 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
883 * xs_reset_transport() zeroing the socket from underneath a writer.
Chuck Leverfe315e72009-03-11 14:10:21 -0400884 */
885static void xs_close(struct rpc_xprt *xprt)
886{
887 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
888
889 dprintk("RPC: xs_close xprt %p\n", xprt);
890
NeilBrown93dc41b2013-10-31 16:14:36 +1100891 cancel_delayed_work_sync(&transport->connect_worker);
892
Chuck Leverfe315e72009-03-11 14:10:21 -0400893 xs_reset_transport(transport);
Neil Brown61d0a8e2009-09-23 14:36:37 -0400894 xprt->reestablish_timeout = 0;
Chuck Leverfe315e72009-03-11 14:10:21 -0400895
Trond Myklebust632e3bd2006-01-03 09:55:55 +0100896 smp_mb__before_clear_bit();
Trond Myklebust7d1e8252009-03-11 14:38:03 -0400897 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
Trond Myklebust632e3bd2006-01-03 09:55:55 +0100898 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
Trond Myklebust3b948ae2007-11-05 17:42:39 -0500899 clear_bit(XPRT_CLOSING, &xprt->state);
Trond Myklebust632e3bd2006-01-03 09:55:55 +0100900 smp_mb__after_clear_bit();
Trond Myklebust62da3b22007-11-06 18:44:20 -0500901 xprt_disconnect_done(xprt);
Chuck Levera246b012005-08-11 16:25:23 -0400902}
903
Trond Myklebustf75e6742009-04-21 17:18:20 -0400904static void xs_tcp_close(struct rpc_xprt *xprt)
905{
906 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state))
907 xs_close(xprt);
908 else
909 xs_tcp_shutdown(xprt);
910}
911
Chuck Lever9903cd12005-08-11 16:25:26 -0400912/**
913 * xs_destroy - prepare to shutdown a transport
914 * @xprt: doomed transport
915 *
916 */
917static void xs_destroy(struct rpc_xprt *xprt)
Chuck Levera246b012005-08-11 16:25:23 -0400918{
Chuck Lever46121cf2007-01-31 12:14:08 -0500919 dprintk("RPC: xs_destroy xprt %p\n", xprt);
Chuck Lever9903cd12005-08-11 16:25:26 -0400920
Trond Myklebusta1311d82013-10-31 09:18:49 -0400921 xs_close(xprt);
922 xs_free_peer_addresses(xprt);
923 xprt_free(xprt);
924 module_put(THIS_MODULE);
Chuck Levera246b012005-08-11 16:25:23 -0400925}
926
Chuck Lever176e21e2011-05-09 15:22:44 -0400927static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb)
928{
929 struct xdr_skb_reader desc = {
930 .skb = skb,
931 .offset = sizeof(rpc_fraghdr),
932 .count = skb->len - sizeof(rpc_fraghdr),
933 };
934
935 if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0)
936 return -1;
937 if (desc.count)
938 return -1;
939 return 0;
940}
941
942/**
943 * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets
944 * @sk: socket with data to read
945 * @len: how much data to read
946 *
947 * Currently this assumes we can read the whole reply in a single gulp.
948 */
949static void xs_local_data_ready(struct sock *sk, int len)
950{
951 struct rpc_task *task;
952 struct rpc_xprt *xprt;
953 struct rpc_rqst *rovr;
954 struct sk_buff *skb;
955 int err, repsize, copied;
956 u32 _xid;
957 __be32 *xp;
958
959 read_lock_bh(&sk->sk_callback_lock);
960 dprintk("RPC: %s...\n", __func__);
961 xprt = xprt_from_sock(sk);
962 if (xprt == NULL)
963 goto out;
964
965 skb = skb_recv_datagram(sk, 0, 1, &err);
966 if (skb == NULL)
967 goto out;
968
Chuck Lever176e21e2011-05-09 15:22:44 -0400969 repsize = skb->len - sizeof(rpc_fraghdr);
970 if (repsize < 4) {
971 dprintk("RPC: impossible RPC reply size %d\n", repsize);
972 goto dropit;
973 }
974
975 /* Copy the XID from the skb... */
976 xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid);
977 if (xp == NULL)
978 goto dropit;
979
980 /* Look up and lock the request corresponding to the given XID */
981 spin_lock(&xprt->transport_lock);
982 rovr = xprt_lookup_rqst(xprt, *xp);
983 if (!rovr)
984 goto out_unlock;
985 task = rovr->rq_task;
986
987 copied = rovr->rq_private_buf.buflen;
988 if (copied > repsize)
989 copied = repsize;
990
991 if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) {
992 dprintk("RPC: sk_buff copy failed\n");
993 goto out_unlock;
994 }
995
996 xprt_complete_rqst(task, copied);
997
998 out_unlock:
999 spin_unlock(&xprt->transport_lock);
1000 dropit:
1001 skb_free_datagram(sk, skb);
1002 out:
1003 read_unlock_bh(&sk->sk_callback_lock);
1004}
1005
Chuck Lever9903cd12005-08-11 16:25:26 -04001006/**
1007 * xs_udp_data_ready - "data ready" callback for UDP sockets
1008 * @sk: socket with data to read
1009 * @len: how much data to read
1010 *
1011 */
1012static void xs_udp_data_ready(struct sock *sk, int len)
1013{
1014 struct rpc_task *task;
1015 struct rpc_xprt *xprt;
Chuck Levera246b012005-08-11 16:25:23 -04001016 struct rpc_rqst *rovr;
Chuck Lever9903cd12005-08-11 16:25:26 -04001017 struct sk_buff *skb;
Chuck Levera246b012005-08-11 16:25:23 -04001018 int err, repsize, copied;
Alexey Dobriyand8ed0292006-09-26 22:29:38 -07001019 u32 _xid;
1020 __be32 *xp;
Chuck Levera246b012005-08-11 16:25:23 -04001021
Eric Dumazetf064af12010-09-22 12:43:39 +00001022 read_lock_bh(&sk->sk_callback_lock);
Chuck Lever46121cf2007-01-31 12:14:08 -05001023 dprintk("RPC: xs_udp_data_ready...\n");
Chuck Lever9903cd12005-08-11 16:25:26 -04001024 if (!(xprt = xprt_from_sock(sk)))
Chuck Levera246b012005-08-11 16:25:23 -04001025 goto out;
Chuck Levera246b012005-08-11 16:25:23 -04001026
1027 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
1028 goto out;
1029
Chuck Levera246b012005-08-11 16:25:23 -04001030 repsize = skb->len - sizeof(struct udphdr);
1031 if (repsize < 4) {
Chuck Lever46121cf2007-01-31 12:14:08 -05001032 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
Chuck Levera246b012005-08-11 16:25:23 -04001033 goto dropit;
1034 }
1035
1036 /* Copy the XID from the skb... */
1037 xp = skb_header_pointer(skb, sizeof(struct udphdr),
1038 sizeof(_xid), &_xid);
1039 if (xp == NULL)
1040 goto dropit;
1041
1042 /* Look up and lock the request corresponding to the given XID */
Chuck Lever4a0f8c02005-08-11 16:25:32 -04001043 spin_lock(&xprt->transport_lock);
Chuck Levera246b012005-08-11 16:25:23 -04001044 rovr = xprt_lookup_rqst(xprt, *xp);
1045 if (!rovr)
1046 goto out_unlock;
1047 task = rovr->rq_task;
1048
Chuck Levera246b012005-08-11 16:25:23 -04001049 if ((copied = rovr->rq_private_buf.buflen) > repsize)
1050 copied = repsize;
1051
1052 /* Suck it into the iovec, verify checksum if not done by hw. */
Herbert Xu1781f7f2007-12-11 11:30:32 -08001053 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1054 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
Chuck Levera246b012005-08-11 16:25:23 -04001055 goto out_unlock;
Herbert Xu1781f7f2007-12-11 11:30:32 -08001056 }
1057
1058 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
Chuck Levera246b012005-08-11 16:25:23 -04001059
Trond Myklebust6a24dfb2013-01-08 09:48:15 -05001060 xprt_adjust_cwnd(xprt, task, copied);
Chuck Lever1570c1e2005-08-25 16:25:52 -07001061 xprt_complete_rqst(task, copied);
Chuck Levera246b012005-08-11 16:25:23 -04001062
1063 out_unlock:
Chuck Lever4a0f8c02005-08-11 16:25:32 -04001064 spin_unlock(&xprt->transport_lock);
Chuck Levera246b012005-08-11 16:25:23 -04001065 dropit:
1066 skb_free_datagram(sk, skb);
1067 out:
Eric Dumazetf064af12010-09-22 12:43:39 +00001068 read_unlock_bh(&sk->sk_callback_lock);
Chuck Levera246b012005-08-11 16:25:23 -04001069}
1070
Trond Myklebusta519fc72012-09-12 16:49:15 -04001071/*
1072 * Helper function to force a TCP close if the server is sending
1073 * junk and/or it has put us in CLOSE_WAIT
1074 */
1075static void xs_tcp_force_close(struct rpc_xprt *xprt)
1076{
1077 set_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
1078 xprt_force_disconnect(xprt);
1079}
1080
Chuck Leverdd456472006-12-05 16:35:44 -05001081static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
Chuck Levera246b012005-08-11 16:25:23 -04001082{
Chuck Lever51971132006-12-05 16:35:19 -05001083 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
Chuck Levera246b012005-08-11 16:25:23 -04001084 size_t len, used;
1085 char *p;
1086
Chuck Lever51971132006-12-05 16:35:19 -05001087 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
1088 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
Chuck Lever9d292312006-12-05 16:35:41 -05001089 used = xdr_skb_read_bits(desc, p, len);
Chuck Lever51971132006-12-05 16:35:19 -05001090 transport->tcp_offset += used;
Chuck Levera246b012005-08-11 16:25:23 -04001091 if (used != len)
1092 return;
Chuck Lever808012f2005-08-25 16:25:49 -07001093
Chuck Lever51971132006-12-05 16:35:19 -05001094 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
1095 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
Chuck Levere136d092006-12-05 16:35:23 -05001096 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
Chuck Levera246b012005-08-11 16:25:23 -04001097 else
Chuck Levere136d092006-12-05 16:35:23 -05001098 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
Chuck Lever51971132006-12-05 16:35:19 -05001099 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
Chuck Lever808012f2005-08-25 16:25:49 -07001100
Chuck Levere136d092006-12-05 16:35:23 -05001101 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
Chuck Lever51971132006-12-05 16:35:19 -05001102 transport->tcp_offset = 0;
Chuck Lever808012f2005-08-25 16:25:49 -07001103
Chuck Levera246b012005-08-11 16:25:23 -04001104 /* Sanity check of the record length */
Ricardo Labiaga18dca022009-04-01 09:22:53 -04001105 if (unlikely(transport->tcp_reclen < 8)) {
Chuck Lever46121cf2007-01-31 12:14:08 -05001106 dprintk("RPC: invalid TCP record fragment length\n");
Trond Myklebusta519fc72012-09-12 16:49:15 -04001107 xs_tcp_force_close(xprt);
Chuck Lever9903cd12005-08-11 16:25:26 -04001108 return;
Chuck Levera246b012005-08-11 16:25:23 -04001109 }
Chuck Lever46121cf2007-01-31 12:14:08 -05001110 dprintk("RPC: reading TCP record fragment of length %d\n",
Chuck Lever51971132006-12-05 16:35:19 -05001111 transport->tcp_reclen);
Chuck Levera246b012005-08-11 16:25:23 -04001112}
1113
Chuck Lever51971132006-12-05 16:35:19 -05001114static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
Chuck Levera246b012005-08-11 16:25:23 -04001115{
Chuck Lever51971132006-12-05 16:35:19 -05001116 if (transport->tcp_offset == transport->tcp_reclen) {
Chuck Levere136d092006-12-05 16:35:23 -05001117 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
Chuck Lever51971132006-12-05 16:35:19 -05001118 transport->tcp_offset = 0;
Chuck Levere136d092006-12-05 16:35:23 -05001119 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
1120 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1121 transport->tcp_flags |= TCP_RCV_COPY_XID;
Chuck Lever51971132006-12-05 16:35:19 -05001122 transport->tcp_copied = 0;
Chuck Levera246b012005-08-11 16:25:23 -04001123 }
1124 }
1125}
1126
Chuck Leverdd456472006-12-05 16:35:44 -05001127static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
Chuck Levera246b012005-08-11 16:25:23 -04001128{
1129 size_t len, used;
1130 char *p;
1131
Chuck Lever51971132006-12-05 16:35:19 -05001132 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
Chuck Lever46121cf2007-01-31 12:14:08 -05001133 dprintk("RPC: reading XID (%Zu bytes)\n", len);
Chuck Lever51971132006-12-05 16:35:19 -05001134 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
Chuck Lever9d292312006-12-05 16:35:41 -05001135 used = xdr_skb_read_bits(desc, p, len);
Chuck Lever51971132006-12-05 16:35:19 -05001136 transport->tcp_offset += used;
Chuck Levera246b012005-08-11 16:25:23 -04001137 if (used != len)
1138 return;
Chuck Levere136d092006-12-05 16:35:23 -05001139 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
Ricardo Labiagaf4a2e412009-04-01 09:22:54 -04001140 transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
Chuck Lever51971132006-12-05 16:35:19 -05001141 transport->tcp_copied = 4;
Ricardo Labiaga18dca022009-04-01 09:22:53 -04001142 dprintk("RPC: reading %s XID %08x\n",
1143 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
1144 : "request with",
Chuck Lever51971132006-12-05 16:35:19 -05001145 ntohl(transport->tcp_xid));
1146 xs_tcp_check_fraghdr(transport);
Chuck Levera246b012005-08-11 16:25:23 -04001147}
1148
Ricardo Labiaga18dca022009-04-01 09:22:53 -04001149static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
1150 struct xdr_skb_reader *desc)
Chuck Levera246b012005-08-11 16:25:23 -04001151{
Ricardo Labiaga18dca022009-04-01 09:22:53 -04001152 size_t len, used;
1153 u32 offset;
Trond Myklebustb76ce562010-06-16 13:57:32 -04001154 char *p;
Ricardo Labiaga18dca022009-04-01 09:22:53 -04001155
1156 /*
1157 * We want transport->tcp_offset to be 8 at the end of this routine
1158 * (4 bytes for the xid and 4 bytes for the call/reply flag).
1159 * When this function is called for the first time,
1160 * transport->tcp_offset is 4 (after having already read the xid).
1161 */
1162 offset = transport->tcp_offset - sizeof(transport->tcp_xid);
Trond Myklebustb76ce562010-06-16 13:57:32 -04001163 len = sizeof(transport->tcp_calldir) - offset;
Ricardo Labiaga18dca022009-04-01 09:22:53 -04001164 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len);
Trond Myklebustb76ce562010-06-16 13:57:32 -04001165 p = ((char *) &transport->tcp_calldir) + offset;
1166 used = xdr_skb_read_bits(desc, p, len);
Ricardo Labiaga18dca022009-04-01 09:22:53 -04001167 transport->tcp_offset += used;
1168 if (used != len)
1169 return;
Ricardo Labiagaf4a2e412009-04-01 09:22:54 -04001170 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
Ricardo Labiagaf4a2e412009-04-01 09:22:54 -04001171 /*
1172 * We don't yet have the XDR buffer, so we will write the calldir
1173 * out after we get the buffer from the 'struct rpc_rqst'
1174 */
Trond Myklebustb76ce562010-06-16 13:57:32 -04001175 switch (ntohl(transport->tcp_calldir)) {
1176 case RPC_REPLY:
1177 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1178 transport->tcp_flags |= TCP_RCV_COPY_DATA;
Ricardo Labiaga18dca022009-04-01 09:22:53 -04001179 transport->tcp_flags |= TCP_RPC_REPLY;
Trond Myklebustb76ce562010-06-16 13:57:32 -04001180 break;
1181 case RPC_CALL:
1182 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1183 transport->tcp_flags |= TCP_RCV_COPY_DATA;
Ricardo Labiaga18dca022009-04-01 09:22:53 -04001184 transport->tcp_flags &= ~TCP_RPC_REPLY;
Trond Myklebustb76ce562010-06-16 13:57:32 -04001185 break;
1186 default:
1187 dprintk("RPC: invalid request message type\n");
Trond Myklebusta519fc72012-09-12 16:49:15 -04001188 xs_tcp_force_close(&transport->xprt);
Trond Myklebustb76ce562010-06-16 13:57:32 -04001189 }
Ricardo Labiaga18dca022009-04-01 09:22:53 -04001190 xs_tcp_check_fraghdr(transport);
1191}
1192
Ricardo Labiaga44b98ef2009-04-01 09:23:02 -04001193static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
1194 struct xdr_skb_reader *desc,
1195 struct rpc_rqst *req)
Chuck Levera246b012005-08-11 16:25:23 -04001196{
Ricardo Labiaga44b98ef2009-04-01 09:23:02 -04001197 struct sock_xprt *transport =
1198 container_of(xprt, struct sock_xprt, xprt);
Chuck Levera246b012005-08-11 16:25:23 -04001199 struct xdr_buf *rcvbuf;
1200 size_t len;
1201 ssize_t r;
1202
Chuck Levera246b012005-08-11 16:25:23 -04001203 rcvbuf = &req->rq_private_buf;
Ricardo Labiagaf4a2e412009-04-01 09:22:54 -04001204
1205 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
1206 /*
1207 * Save the RPC direction in the XDR buffer
1208 */
Ricardo Labiagaf4a2e412009-04-01 09:22:54 -04001209 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
Trond Myklebustb76ce562010-06-16 13:57:32 -04001210 &transport->tcp_calldir,
1211 sizeof(transport->tcp_calldir));
1212 transport->tcp_copied += sizeof(transport->tcp_calldir);
Ricardo Labiagaf4a2e412009-04-01 09:22:54 -04001213 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
Chuck Levera246b012005-08-11 16:25:23 -04001214 }
1215
Chuck Levera246b012005-08-11 16:25:23 -04001216 len = desc->count;
Chuck Lever51971132006-12-05 16:35:19 -05001217 if (len > transport->tcp_reclen - transport->tcp_offset) {
Chuck Leverdd456472006-12-05 16:35:44 -05001218 struct xdr_skb_reader my_desc;
Chuck Levera246b012005-08-11 16:25:23 -04001219
Chuck Lever51971132006-12-05 16:35:19 -05001220 len = transport->tcp_reclen - transport->tcp_offset;
Chuck Levera246b012005-08-11 16:25:23 -04001221 memcpy(&my_desc, desc, sizeof(my_desc));
1222 my_desc.count = len;
Chuck Lever51971132006-12-05 16:35:19 -05001223 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
Chuck Lever9d292312006-12-05 16:35:41 -05001224 &my_desc, xdr_skb_read_bits);
Chuck Levera246b012005-08-11 16:25:23 -04001225 desc->count -= r;
1226 desc->offset += r;
1227 } else
Chuck Lever51971132006-12-05 16:35:19 -05001228 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
Chuck Lever9d292312006-12-05 16:35:41 -05001229 desc, xdr_skb_read_bits);
Chuck Levera246b012005-08-11 16:25:23 -04001230
1231 if (r > 0) {
Chuck Lever51971132006-12-05 16:35:19 -05001232 transport->tcp_copied += r;
1233 transport->tcp_offset += r;
Chuck Levera246b012005-08-11 16:25:23 -04001234 }
1235 if (r != len) {
1236 /* Error when copying to the receive buffer,
1237 * usually because we weren't able to allocate
1238 * additional buffer pages. All we can do now
Chuck Levere136d092006-12-05 16:35:23 -05001239 * is turn off TCP_RCV_COPY_DATA, so the request
Chuck Levera246b012005-08-11 16:25:23 -04001240 * will not receive any additional updates,
1241 * and time out.
1242 * Any remaining data from this record will
1243 * be discarded.
1244 */
Chuck Levere136d092006-12-05 16:35:23 -05001245 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
Chuck Lever46121cf2007-01-31 12:14:08 -05001246 dprintk("RPC: XID %08x truncated request\n",
Chuck Lever51971132006-12-05 16:35:19 -05001247 ntohl(transport->tcp_xid));
Chuck Lever46121cf2007-01-31 12:14:08 -05001248 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1249 "tcp_offset = %u, tcp_reclen = %u\n",
1250 xprt, transport->tcp_copied,
1251 transport->tcp_offset, transport->tcp_reclen);
Ricardo Labiaga44b98ef2009-04-01 09:23:02 -04001252 return;
Chuck Levera246b012005-08-11 16:25:23 -04001253 }
1254
Chuck Lever46121cf2007-01-31 12:14:08 -05001255 dprintk("RPC: XID %08x read %Zd bytes\n",
Chuck Lever51971132006-12-05 16:35:19 -05001256 ntohl(transport->tcp_xid), r);
Chuck Lever46121cf2007-01-31 12:14:08 -05001257 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1258 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1259 transport->tcp_offset, transport->tcp_reclen);
Chuck Levera246b012005-08-11 16:25:23 -04001260
Chuck Lever51971132006-12-05 16:35:19 -05001261 if (transport->tcp_copied == req->rq_private_buf.buflen)
Chuck Levere136d092006-12-05 16:35:23 -05001262 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
Chuck Lever51971132006-12-05 16:35:19 -05001263 else if (transport->tcp_offset == transport->tcp_reclen) {
Chuck Levere136d092006-12-05 16:35:23 -05001264 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1265 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
Chuck Levera246b012005-08-11 16:25:23 -04001266 }
Ricardo Labiaga44b98ef2009-04-01 09:23:02 -04001267}
1268
1269/*
1270 * Finds the request corresponding to the RPC xid and invokes the common
1271 * tcp read code to read the data.
1272 */
1273static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
1274 struct xdr_skb_reader *desc)
1275{
1276 struct sock_xprt *transport =
1277 container_of(xprt, struct sock_xprt, xprt);
1278 struct rpc_rqst *req;
1279
1280 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid));
1281
1282 /* Find and lock the request corresponding to this xid */
1283 spin_lock(&xprt->transport_lock);
1284 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
1285 if (!req) {
1286 dprintk("RPC: XID %08x request not found!\n",
1287 ntohl(transport->tcp_xid));
1288 spin_unlock(&xprt->transport_lock);
1289 return -1;
1290 }
1291
1292 xs_tcp_read_common(xprt, desc, req);
1293
Chuck Levere136d092006-12-05 16:35:23 -05001294 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
Chuck Lever51971132006-12-05 16:35:19 -05001295 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
Ricardo Labiaga44b98ef2009-04-01 09:23:02 -04001296
Chuck Lever4a0f8c02005-08-11 16:25:32 -04001297 spin_unlock(&xprt->transport_lock);
Ricardo Labiaga44b98ef2009-04-01 09:23:02 -04001298 return 0;
1299}
1300
Trond Myklebust9e00abc2011-07-13 19:20:49 -04001301#if defined(CONFIG_SUNRPC_BACKCHANNEL)
Ricardo Labiaga44b98ef2009-04-01 09:23:02 -04001302/*
1303 * Obtains an rpc_rqst previously allocated and invokes the common
1304 * tcp read code to read the data. The result is placed in the callback
1305 * queue.
1306 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1307 * connection and return -1.
1308 */
Trond Myklebust2ea24492014-02-10 11:18:39 -05001309static int xs_tcp_read_callback(struct rpc_xprt *xprt,
Ricardo Labiaga44b98ef2009-04-01 09:23:02 -04001310 struct xdr_skb_reader *desc)
1311{
1312 struct sock_xprt *transport =
1313 container_of(xprt, struct sock_xprt, xprt);
1314 struct rpc_rqst *req;
1315
Trond Myklebust2ea24492014-02-10 11:18:39 -05001316 /* Look up and lock the request corresponding to the given XID */
1317 spin_lock(&xprt->transport_lock);
1318 req = xprt_lookup_bc_request(xprt, transport->tcp_xid);
Ricardo Labiaga44b98ef2009-04-01 09:23:02 -04001319 if (req == NULL) {
Trond Myklebust2ea24492014-02-10 11:18:39 -05001320 spin_unlock(&xprt->transport_lock);
Ricardo Labiaga44b98ef2009-04-01 09:23:02 -04001321 printk(KERN_WARNING "Callback slot table overflowed\n");
1322 xprt_force_disconnect(xprt);
1323 return -1;
1324 }
1325
Ricardo Labiaga44b98ef2009-04-01 09:23:02 -04001326 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid));
1327 xs_tcp_read_common(xprt, desc, req);
1328
Trond Myklebust2ea24492014-02-10 11:18:39 -05001329 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1330 xprt_complete_bc_request(req, transport->tcp_copied);
1331 spin_unlock(&xprt->transport_lock);
Ricardo Labiaga44b98ef2009-04-01 09:23:02 -04001332
1333 return 0;
1334}
1335
1336static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1337 struct xdr_skb_reader *desc)
1338{
1339 struct sock_xprt *transport =
1340 container_of(xprt, struct sock_xprt, xprt);
1341
1342 return (transport->tcp_flags & TCP_RPC_REPLY) ?
1343 xs_tcp_read_reply(xprt, desc) :
1344 xs_tcp_read_callback(xprt, desc);
1345}
1346#else
1347static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1348 struct xdr_skb_reader *desc)
1349{
1350 return xs_tcp_read_reply(xprt, desc);
1351}
Trond Myklebust9e00abc2011-07-13 19:20:49 -04001352#endif /* CONFIG_SUNRPC_BACKCHANNEL */
Ricardo Labiaga44b98ef2009-04-01 09:23:02 -04001353
1354/*
1355 * Read data off the transport. This can be either an RPC_CALL or an
1356 * RPC_REPLY. Relay the processing to helper functions.
1357 */
1358static void xs_tcp_read_data(struct rpc_xprt *xprt,
1359 struct xdr_skb_reader *desc)
1360{
1361 struct sock_xprt *transport =
1362 container_of(xprt, struct sock_xprt, xprt);
1363
1364 if (_xs_tcp_read_data(xprt, desc) == 0)
1365 xs_tcp_check_fraghdr(transport);
1366 else {
1367 /*
1368 * The transport_lock protects the request handling.
1369 * There's no need to hold it to update the tcp_flags.
1370 */
1371 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1372 }
Chuck Levera246b012005-08-11 16:25:23 -04001373}
1374
Chuck Leverdd456472006-12-05 16:35:44 -05001375static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
Chuck Levera246b012005-08-11 16:25:23 -04001376{
1377 size_t len;
1378
Chuck Lever51971132006-12-05 16:35:19 -05001379 len = transport->tcp_reclen - transport->tcp_offset;
Chuck Levera246b012005-08-11 16:25:23 -04001380 if (len > desc->count)
1381 len = desc->count;
1382 desc->count -= len;
1383 desc->offset += len;
Chuck Lever51971132006-12-05 16:35:19 -05001384 transport->tcp_offset += len;
Chuck Lever46121cf2007-01-31 12:14:08 -05001385 dprintk("RPC: discarded %Zu bytes\n", len);
Chuck Lever51971132006-12-05 16:35:19 -05001386 xs_tcp_check_fraghdr(transport);
Chuck Levera246b012005-08-11 16:25:23 -04001387}
1388
Chuck Lever9903cd12005-08-11 16:25:26 -04001389static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
Chuck Levera246b012005-08-11 16:25:23 -04001390{
1391 struct rpc_xprt *xprt = rd_desc->arg.data;
Chuck Lever51971132006-12-05 16:35:19 -05001392 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
Chuck Leverdd456472006-12-05 16:35:44 -05001393 struct xdr_skb_reader desc = {
Chuck Levera246b012005-08-11 16:25:23 -04001394 .skb = skb,
1395 .offset = offset,
1396 .count = len,
Chuck Lever9903cd12005-08-11 16:25:26 -04001397 };
Chuck Levera246b012005-08-11 16:25:23 -04001398
Chuck Lever46121cf2007-01-31 12:14:08 -05001399 dprintk("RPC: xs_tcp_data_recv started\n");
Chuck Levera246b012005-08-11 16:25:23 -04001400 do {
1401 /* Read in a new fragment marker if necessary */
1402 /* Can we ever really expect to get completely empty fragments? */
Chuck Levere136d092006-12-05 16:35:23 -05001403 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
Chuck Lever9903cd12005-08-11 16:25:26 -04001404 xs_tcp_read_fraghdr(xprt, &desc);
Chuck Levera246b012005-08-11 16:25:23 -04001405 continue;
1406 }
1407 /* Read in the xid if necessary */
Chuck Levere136d092006-12-05 16:35:23 -05001408 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
Chuck Lever51971132006-12-05 16:35:19 -05001409 xs_tcp_read_xid(transport, &desc);
Chuck Levera246b012005-08-11 16:25:23 -04001410 continue;
1411 }
Ricardo Labiaga18dca022009-04-01 09:22:53 -04001412 /* Read in the call/reply flag */
Ricardo Labiagaf4a2e412009-04-01 09:22:54 -04001413 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
Ricardo Labiaga18dca022009-04-01 09:22:53 -04001414 xs_tcp_read_calldir(transport, &desc);
1415 continue;
1416 }
Chuck Levera246b012005-08-11 16:25:23 -04001417 /* Read in the request data */
Chuck Levere136d092006-12-05 16:35:23 -05001418 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
Ricardo Labiaga44b98ef2009-04-01 09:23:02 -04001419 xs_tcp_read_data(xprt, &desc);
Chuck Levera246b012005-08-11 16:25:23 -04001420 continue;
1421 }
1422 /* Skip over any trailing bytes on short reads */
Chuck Lever51971132006-12-05 16:35:19 -05001423 xs_tcp_read_discard(transport, &desc);
Chuck Levera246b012005-08-11 16:25:23 -04001424 } while (desc.count);
Chuck Lever46121cf2007-01-31 12:14:08 -05001425 dprintk("RPC: xs_tcp_data_recv done\n");
Chuck Levera246b012005-08-11 16:25:23 -04001426 return len - desc.count;
1427}
1428
Chuck Lever9903cd12005-08-11 16:25:26 -04001429/**
1430 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1431 * @sk: socket with data to read
1432 * @bytes: how much data to read
1433 *
1434 */
1435static void xs_tcp_data_ready(struct sock *sk, int bytes)
Chuck Levera246b012005-08-11 16:25:23 -04001436{
1437 struct rpc_xprt *xprt;
1438 read_descriptor_t rd_desc;
Trond Myklebustff2d7db2008-02-25 21:40:51 -08001439 int read;
Chuck Levera246b012005-08-11 16:25:23 -04001440
Chuck Lever46121cf2007-01-31 12:14:08 -05001441 dprintk("RPC: xs_tcp_data_ready...\n");
1442
Eric Dumazetf064af12010-09-22 12:43:39 +00001443 read_lock_bh(&sk->sk_callback_lock);
Chuck Lever9903cd12005-08-11 16:25:26 -04001444 if (!(xprt = xprt_from_sock(sk)))
Chuck Levera246b012005-08-11 16:25:23 -04001445 goto out;
Neil Brown61d0a8e2009-09-23 14:36:37 -04001446 /* Any data means we had a useful conversation, so
1447 * the we don't need to delay the next reconnect
1448 */
1449 if (xprt->reestablish_timeout)
1450 xprt->reestablish_timeout = 0;
1451
Chuck Lever9903cd12005-08-11 16:25:26 -04001452 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
Chuck Levera246b012005-08-11 16:25:23 -04001453 rd_desc.arg.data = xprt;
Trond Myklebustff2d7db2008-02-25 21:40:51 -08001454 do {
1455 rd_desc.count = 65536;
1456 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1457 } while (read > 0);
Chuck Levera246b012005-08-11 16:25:23 -04001458out:
Eric Dumazetf064af12010-09-22 12:43:39 +00001459 read_unlock_bh(&sk->sk_callback_lock);
Chuck Levera246b012005-08-11 16:25:23 -04001460}
1461
Trond Myklebust7d1e8252009-03-11 14:38:03 -04001462/*
1463 * Do the equivalent of linger/linger2 handling for dealing with
1464 * broken servers that don't close the socket in a timely
1465 * fashion
1466 */
1467static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt,
1468 unsigned long timeout)
1469{
1470 struct sock_xprt *transport;
1471
1472 if (xprt_test_and_set_connecting(xprt))
1473 return;
1474 set_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1475 transport = container_of(xprt, struct sock_xprt, xprt);
1476 queue_delayed_work(rpciod_workqueue, &transport->connect_worker,
1477 timeout);
1478}
1479
1480static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt)
1481{
1482 struct sock_xprt *transport;
1483
1484 transport = container_of(xprt, struct sock_xprt, xprt);
1485
1486 if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) ||
1487 !cancel_delayed_work(&transport->connect_worker))
1488 return;
1489 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1490 xprt_clear_connecting(xprt);
1491}
1492
Trond Myklebust4bc1e682012-10-23 17:50:07 -04001493static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
Trond Myklebust7d1e8252009-03-11 14:38:03 -04001494{
1495 smp_mb__before_clear_bit();
Trond Myklebusta519fc72012-09-12 16:49:15 -04001496 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1497 clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
Trond Myklebust7d1e8252009-03-11 14:38:03 -04001498 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1499 clear_bit(XPRT_CLOSING, &xprt->state);
1500 smp_mb__after_clear_bit();
Trond Myklebust4bc1e682012-10-23 17:50:07 -04001501}
1502
1503static void xs_sock_mark_closed(struct rpc_xprt *xprt)
1504{
1505 xs_sock_reset_connection_flags(xprt);
Trond Myklebust7d1e8252009-03-11 14:38:03 -04001506 /* Mark transport as closed and wake up all pending tasks */
1507 xprt_disconnect_done(xprt);
1508}
1509
Chuck Lever9903cd12005-08-11 16:25:26 -04001510/**
1511 * xs_tcp_state_change - callback to handle TCP socket state changes
1512 * @sk: socket whose state has changed
1513 *
1514 */
1515static void xs_tcp_state_change(struct sock *sk)
Chuck Levera246b012005-08-11 16:25:23 -04001516{
Chuck Lever9903cd12005-08-11 16:25:26 -04001517 struct rpc_xprt *xprt;
Chuck Levera246b012005-08-11 16:25:23 -04001518
Eric Dumazetf064af12010-09-22 12:43:39 +00001519 read_lock_bh(&sk->sk_callback_lock);
Chuck Levera246b012005-08-11 16:25:23 -04001520 if (!(xprt = xprt_from_sock(sk)))
1521 goto out;
Chuck Lever46121cf2007-01-31 12:14:08 -05001522 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
Andy Chittenden669502f2010-08-10 10:19:53 -04001523 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
Chuck Lever46121cf2007-01-31 12:14:08 -05001524 sk->sk_state, xprt_connected(xprt),
1525 sock_flag(sk, SOCK_DEAD),
Andy Chittenden669502f2010-08-10 10:19:53 -04001526 sock_flag(sk, SOCK_ZAPPED),
1527 sk->sk_shutdown);
Chuck Levera246b012005-08-11 16:25:23 -04001528
Trond Myklebust40b5ea02013-09-04 12:16:23 -04001529 trace_rpc_socket_state_change(xprt, sk->sk_socket);
Chuck Levera246b012005-08-11 16:25:23 -04001530 switch (sk->sk_state) {
1531 case TCP_ESTABLISHED:
Eric Dumazetf064af12010-09-22 12:43:39 +00001532 spin_lock(&xprt->transport_lock);
Chuck Levera246b012005-08-11 16:25:23 -04001533 if (!xprt_test_and_set_connected(xprt)) {
Chuck Lever51971132006-12-05 16:35:19 -05001534 struct sock_xprt *transport = container_of(xprt,
1535 struct sock_xprt, xprt);
1536
Chuck Levera246b012005-08-11 16:25:23 -04001537 /* Reset TCP record info */
Chuck Lever51971132006-12-05 16:35:19 -05001538 transport->tcp_offset = 0;
1539 transport->tcp_reclen = 0;
1540 transport->tcp_copied = 0;
Chuck Levere136d092006-12-05 16:35:23 -05001541 transport->tcp_flags =
1542 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
Trond Myklebust8b717982013-09-26 10:18:04 -04001543 xprt->connect_cookie++;
Chuck Lever51971132006-12-05 16:35:19 -05001544
Trond Myklebust2a491992009-03-11 14:38:00 -04001545 xprt_wake_pending_tasks(xprt, -EAGAIN);
Chuck Levera246b012005-08-11 16:25:23 -04001546 }
Eric Dumazetf064af12010-09-22 12:43:39 +00001547 spin_unlock(&xprt->transport_lock);
Chuck Levera246b012005-08-11 16:25:23 -04001548 break;
Trond Myklebust3b948ae2007-11-05 17:42:39 -05001549 case TCP_FIN_WAIT1:
1550 /* The client initiated a shutdown of the socket */
Trond Myklebust7c1d71c2008-04-17 16:52:57 -04001551 xprt->connect_cookie++;
Trond Myklebust663b8852008-01-01 18:42:12 -05001552 xprt->reestablish_timeout = 0;
Trond Myklebust3b948ae2007-11-05 17:42:39 -05001553 set_bit(XPRT_CLOSING, &xprt->state);
1554 smp_mb__before_clear_bit();
1555 clear_bit(XPRT_CONNECTED, &xprt->state);
Trond Myklebustef803672007-12-31 16:19:17 -05001556 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
Trond Myklebust3b948ae2007-11-05 17:42:39 -05001557 smp_mb__after_clear_bit();
Trond Myklebust25fe6142009-03-11 14:38:03 -04001558 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
Chuck Levera246b012005-08-11 16:25:23 -04001559 break;
Trond Myklebust632e3bd2006-01-03 09:55:55 +01001560 case TCP_CLOSE_WAIT:
Trond Myklebust3b948ae2007-11-05 17:42:39 -05001561 /* The server initiated a shutdown of the socket */
Trond Myklebust7c1d71c2008-04-17 16:52:57 -04001562 xprt->connect_cookie++;
Trond Myklebustd0bea452012-10-23 11:35:47 -04001563 clear_bit(XPRT_CONNECTED, &xprt->state);
Trond Myklebusta519fc72012-09-12 16:49:15 -04001564 xs_tcp_force_close(xprt);
Trond Myklebust663b8852008-01-01 18:42:12 -05001565 case TCP_CLOSING:
1566 /*
1567 * If the server closed down the connection, make sure that
1568 * we back off before reconnecting
1569 */
1570 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1571 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
Trond Myklebust3b948ae2007-11-05 17:42:39 -05001572 break;
1573 case TCP_LAST_ACK:
Trond Myklebust670f9452009-03-11 14:37:58 -04001574 set_bit(XPRT_CLOSING, &xprt->state);
Trond Myklebust25fe6142009-03-11 14:38:03 -04001575 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
Trond Myklebust3b948ae2007-11-05 17:42:39 -05001576 smp_mb__before_clear_bit();
1577 clear_bit(XPRT_CONNECTED, &xprt->state);
1578 smp_mb__after_clear_bit();
1579 break;
1580 case TCP_CLOSE:
Trond Myklebust7d1e8252009-03-11 14:38:03 -04001581 xs_tcp_cancel_linger_timeout(xprt);
1582 xs_sock_mark_closed(xprt);
Chuck Levera246b012005-08-11 16:25:23 -04001583 }
1584 out:
Eric Dumazetf064af12010-09-22 12:43:39 +00001585 read_unlock_bh(&sk->sk_callback_lock);
Chuck Levera246b012005-08-11 16:25:23 -04001586}
1587
Ilpo Järvinen1f0fa152009-02-06 23:48:33 -08001588static void xs_write_space(struct sock *sk)
1589{
1590 struct socket *sock;
1591 struct rpc_xprt *xprt;
1592
1593 if (unlikely(!(sock = sk->sk_socket)))
1594 return;
1595 clear_bit(SOCK_NOSPACE, &sock->flags);
1596
1597 if (unlikely(!(xprt = xprt_from_sock(sk))))
1598 return;
1599 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1600 return;
1601
1602 xprt_write_space(xprt);
1603}
1604
Trond Myklebust2a9e1cf2008-10-28 15:21:39 -04001605/**
Chuck Leverc7b2cae2005-08-11 16:25:50 -04001606 * xs_udp_write_space - callback invoked when socket buffer space
1607 * becomes available
Chuck Lever9903cd12005-08-11 16:25:26 -04001608 * @sk: socket whose state has changed
1609 *
Chuck Levera246b012005-08-11 16:25:23 -04001610 * Called when more output buffer space is available for this socket.
1611 * We try not to wake our writers until they can make "significant"
Chuck Leverc7b2cae2005-08-11 16:25:50 -04001612 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
Chuck Levera246b012005-08-11 16:25:23 -04001613 * with a bunch of small requests.
1614 */
Chuck Leverc7b2cae2005-08-11 16:25:50 -04001615static void xs_udp_write_space(struct sock *sk)
Chuck Levera246b012005-08-11 16:25:23 -04001616{
Eric Dumazetf064af12010-09-22 12:43:39 +00001617 read_lock_bh(&sk->sk_callback_lock);
Chuck Levera246b012005-08-11 16:25:23 -04001618
Chuck Leverc7b2cae2005-08-11 16:25:50 -04001619 /* from net/core/sock.c:sock_def_write_space */
Ilpo Järvinen1f0fa152009-02-06 23:48:33 -08001620 if (sock_writeable(sk))
1621 xs_write_space(sk);
Chuck Leverc7b2cae2005-08-11 16:25:50 -04001622
Eric Dumazetf064af12010-09-22 12:43:39 +00001623 read_unlock_bh(&sk->sk_callback_lock);
Chuck Leverc7b2cae2005-08-11 16:25:50 -04001624}
Chuck Levera246b012005-08-11 16:25:23 -04001625
Chuck Leverc7b2cae2005-08-11 16:25:50 -04001626/**
1627 * xs_tcp_write_space - callback invoked when socket buffer space
1628 * becomes available
1629 * @sk: socket whose state has changed
1630 *
1631 * Called when more output buffer space is available for this socket.
1632 * We try not to wake our writers until they can make "significant"
1633 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1634 * with a bunch of small requests.
1635 */
1636static void xs_tcp_write_space(struct sock *sk)
1637{
Eric Dumazetf064af12010-09-22 12:43:39 +00001638 read_lock_bh(&sk->sk_callback_lock);
Chuck Leverc7b2cae2005-08-11 16:25:50 -04001639
1640 /* from net/core/stream.c:sk_stream_write_space */
Eric Dumazet64dc6132013-07-22 20:26:31 -07001641 if (sk_stream_is_writeable(sk))
Ilpo Järvinen1f0fa152009-02-06 23:48:33 -08001642 xs_write_space(sk);
Chuck Leverc7b2cae2005-08-11 16:25:50 -04001643
Eric Dumazetf064af12010-09-22 12:43:39 +00001644 read_unlock_bh(&sk->sk_callback_lock);
Chuck Levera246b012005-08-11 16:25:23 -04001645}
1646
Chuck Lever470056c2005-08-25 16:25:56 -07001647static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
Chuck Levera246b012005-08-11 16:25:23 -04001648{
Chuck Leveree0ac0c2006-12-05 16:35:15 -05001649 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1650 struct sock *sk = transport->inet;
Chuck Levera246b012005-08-11 16:25:23 -04001651
Chuck Lever7c6e0662006-12-05 16:35:30 -05001652 if (transport->rcvsize) {
Chuck Levera246b012005-08-11 16:25:23 -04001653 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
Chuck Lever7c6e0662006-12-05 16:35:30 -05001654 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
Chuck Levera246b012005-08-11 16:25:23 -04001655 }
Chuck Lever7c6e0662006-12-05 16:35:30 -05001656 if (transport->sndsize) {
Chuck Levera246b012005-08-11 16:25:23 -04001657 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
Chuck Lever7c6e0662006-12-05 16:35:30 -05001658 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
Chuck Levera246b012005-08-11 16:25:23 -04001659 sk->sk_write_space(sk);
1660 }
1661}
1662
Chuck Lever43118c22005-08-25 16:25:49 -07001663/**
Chuck Lever470056c2005-08-25 16:25:56 -07001664 * xs_udp_set_buffer_size - set send and receive limits
Chuck Lever43118c22005-08-25 16:25:49 -07001665 * @xprt: generic transport
Chuck Lever470056c2005-08-25 16:25:56 -07001666 * @sndsize: requested size of send buffer, in bytes
1667 * @rcvsize: requested size of receive buffer, in bytes
Chuck Lever43118c22005-08-25 16:25:49 -07001668 *
Chuck Lever470056c2005-08-25 16:25:56 -07001669 * Set socket send and receive buffer size limits.
Chuck Lever43118c22005-08-25 16:25:49 -07001670 */
Chuck Lever470056c2005-08-25 16:25:56 -07001671static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
Chuck Lever43118c22005-08-25 16:25:49 -07001672{
Chuck Lever7c6e0662006-12-05 16:35:30 -05001673 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1674
1675 transport->sndsize = 0;
Chuck Lever470056c2005-08-25 16:25:56 -07001676 if (sndsize)
Chuck Lever7c6e0662006-12-05 16:35:30 -05001677 transport->sndsize = sndsize + 1024;
1678 transport->rcvsize = 0;
Chuck Lever470056c2005-08-25 16:25:56 -07001679 if (rcvsize)
Chuck Lever7c6e0662006-12-05 16:35:30 -05001680 transport->rcvsize = rcvsize + 1024;
Chuck Lever470056c2005-08-25 16:25:56 -07001681
1682 xs_udp_do_set_buffer_size(xprt);
Chuck Lever43118c22005-08-25 16:25:49 -07001683}
1684
Chuck Lever46c0ee82005-08-25 16:25:52 -07001685/**
1686 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1687 * @task: task that timed out
1688 *
1689 * Adjust the congestion window after a retransmit timeout has occurred.
1690 */
Trond Myklebust6a24dfb2013-01-08 09:48:15 -05001691static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
Chuck Lever46c0ee82005-08-25 16:25:52 -07001692{
Trond Myklebust6a24dfb2013-01-08 09:48:15 -05001693 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
Chuck Lever46c0ee82005-08-25 16:25:52 -07001694}
1695
Chuck Leverb85d8802006-05-25 01:40:49 -04001696static unsigned short xs_get_random_port(void)
1697{
1698 unsigned short range = xprt_max_resvport - xprt_min_resvport;
Aruna-Hewapathirane63862b52014-01-11 07:15:59 -05001699 unsigned short rand = (unsigned short) prandom_u32() % range;
Chuck Leverb85d8802006-05-25 01:40:49 -04001700 return rand + xprt_min_resvport;
1701}
1702
Chuck Lever92200412006-01-03 09:55:51 +01001703/**
1704 * xs_set_port - reset the port number in the remote endpoint address
1705 * @xprt: generic transport
1706 * @port: new port number
1707 *
1708 */
1709static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1710{
Chuck Lever46121cf2007-01-31 12:14:08 -05001711 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
Chuck Leverc4efcb12006-08-22 20:06:19 -04001712
Chuck Lever9dc3b092009-08-09 15:09:46 -04001713 rpc_set_port(xs_addr(xprt), port);
1714 xs_update_peer_port(xprt);
Chuck Lever92200412006-01-03 09:55:51 +01001715}
1716
Pavel Emelyanov5d4ec932010-10-04 16:51:23 +04001717static unsigned short xs_get_srcport(struct sock_xprt *transport)
Trond Myklebust67a391d2007-11-05 17:40:58 -05001718{
Chuck Leverfbfffbd2009-08-09 15:09:46 -04001719 unsigned short port = transport->srcport;
Trond Myklebust67a391d2007-11-05 17:40:58 -05001720
1721 if (port == 0 && transport->xprt.resvport)
1722 port = xs_get_random_port();
1723 return port;
1724}
1725
Pavel Emelyanovbaaf4e42010-10-04 16:51:56 +04001726static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
Trond Myklebust67a391d2007-11-05 17:40:58 -05001727{
Chuck Leverfbfffbd2009-08-09 15:09:46 -04001728 if (transport->srcport != 0)
1729 transport->srcport = 0;
Trond Myklebust67a391d2007-11-05 17:40:58 -05001730 if (!transport->xprt.resvport)
1731 return 0;
1732 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1733 return xprt_max_resvport;
1734 return --port;
1735}
Pavel Emelyanovbeb59b62010-10-05 15:53:08 +04001736static int xs_bind(struct sock_xprt *transport, struct socket *sock)
Chuck Levera246b012005-08-11 16:25:23 -04001737{
Pavel Emelyanovbeb59b62010-10-05 15:53:08 +04001738 struct sockaddr_storage myaddr;
Trond Myklebust67a391d2007-11-05 17:40:58 -05001739 int err, nloop = 0;
Pavel Emelyanov5d4ec932010-10-04 16:51:23 +04001740 unsigned short port = xs_get_srcport(transport);
Trond Myklebust67a391d2007-11-05 17:40:58 -05001741 unsigned short last;
Chuck Levera246b012005-08-11 16:25:23 -04001742
Pavel Emelyanovbeb59b62010-10-05 15:53:08 +04001743 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
Chuck Levera246b012005-08-11 16:25:23 -04001744 do {
Pavel Emelyanovbeb59b62010-10-05 15:53:08 +04001745 rpc_set_port((struct sockaddr *)&myaddr, port);
1746 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1747 transport->xprt.addrlen);
Trond Myklebust67a391d2007-11-05 17:40:58 -05001748 if (port == 0)
Frank van Maarseveend3bc9a12007-07-09 22:23:35 +02001749 break;
Chuck Levera246b012005-08-11 16:25:23 -04001750 if (err == 0) {
Chuck Leverfbfffbd2009-08-09 15:09:46 -04001751 transport->srcport = port;
Frank van Maarseveend3bc9a12007-07-09 22:23:35 +02001752 break;
Chuck Levera246b012005-08-11 16:25:23 -04001753 }
Trond Myklebust67a391d2007-11-05 17:40:58 -05001754 last = port;
Pavel Emelyanovbaaf4e42010-10-04 16:51:56 +04001755 port = xs_next_srcport(transport, port);
Trond Myklebust67a391d2007-11-05 17:40:58 -05001756 if (port > last)
1757 nloop++;
1758 } while (err == -EADDRINUSE && nloop != 2);
Pavel Emelyanovbeb59b62010-10-05 15:53:08 +04001759
Chuck Lever4232e862010-10-20 11:52:51 -04001760 if (myaddr.ss_family == AF_INET)
Pavel Emelyanovbeb59b62010-10-05 15:53:08 +04001761 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1762 &((struct sockaddr_in *)&myaddr)->sin_addr,
1763 port, err ? "failed" : "ok", err);
1764 else
1765 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1766 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1767 port, err ? "failed" : "ok", err);
Chuck Levera246b012005-08-11 16:25:23 -04001768 return err;
1769}
1770
Chuck Lever176e21e2011-05-09 15:22:44 -04001771/*
1772 * We don't support autobind on AF_LOCAL sockets
1773 */
1774static void xs_local_rpcbind(struct rpc_task *task)
1775{
Trond Myklebust3dc0da22013-01-08 09:31:13 -05001776 rcu_read_lock();
1777 xprt_set_bound(rcu_dereference(task->tk_client->cl_xprt));
1778 rcu_read_unlock();
Chuck Lever176e21e2011-05-09 15:22:44 -04001779}
1780
1781static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1782{
1783}
Chuck Levera246b012005-08-11 16:25:23 -04001784
Peter Zijlstraed075362006-12-06 20:35:24 -08001785#ifdef CONFIG_DEBUG_LOCK_ALLOC
1786static struct lock_class_key xs_key[2];
1787static struct lock_class_key xs_slock_key[2];
1788
Chuck Lever176e21e2011-05-09 15:22:44 -04001789static inline void xs_reclassify_socketu(struct socket *sock)
1790{
1791 struct sock *sk = sock->sk;
1792
Chuck Lever176e21e2011-05-09 15:22:44 -04001793 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1794 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
1795}
1796
Chuck Lever8945ee52007-08-06 11:58:04 -04001797static inline void xs_reclassify_socket4(struct socket *sock)
Peter Zijlstraed075362006-12-06 20:35:24 -08001798{
1799 struct sock *sk = sock->sk;
Chuck Lever8945ee52007-08-06 11:58:04 -04001800
Chuck Lever8945ee52007-08-06 11:58:04 -04001801 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1802 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1803}
Peter Zijlstraed075362006-12-06 20:35:24 -08001804
Chuck Lever8945ee52007-08-06 11:58:04 -04001805static inline void xs_reclassify_socket6(struct socket *sock)
1806{
1807 struct sock *sk = sock->sk;
Peter Zijlstraed075362006-12-06 20:35:24 -08001808
Chuck Lever8945ee52007-08-06 11:58:04 -04001809 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1810 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
Peter Zijlstraed075362006-12-06 20:35:24 -08001811}
Pavel Emelyanov6bc96382010-10-04 16:56:38 +04001812
1813static inline void xs_reclassify_socket(int family, struct socket *sock)
1814{
Weston Andros Adamson1b7a1812012-10-23 10:43:39 -04001815 WARN_ON_ONCE(sock_owned_by_user(sock->sk));
1816 if (sock_owned_by_user(sock->sk))
1817 return;
1818
Chuck Lever4232e862010-10-20 11:52:51 -04001819 switch (family) {
Chuck Lever176e21e2011-05-09 15:22:44 -04001820 case AF_LOCAL:
1821 xs_reclassify_socketu(sock);
1822 break;
Chuck Lever4232e862010-10-20 11:52:51 -04001823 case AF_INET:
Pavel Emelyanov6bc96382010-10-04 16:56:38 +04001824 xs_reclassify_socket4(sock);
Chuck Lever4232e862010-10-20 11:52:51 -04001825 break;
1826 case AF_INET6:
Pavel Emelyanov6bc96382010-10-04 16:56:38 +04001827 xs_reclassify_socket6(sock);
Chuck Lever4232e862010-10-20 11:52:51 -04001828 break;
1829 }
Pavel Emelyanov6bc96382010-10-04 16:56:38 +04001830}
Peter Zijlstraed075362006-12-06 20:35:24 -08001831#else
Chuck Lever176e21e2011-05-09 15:22:44 -04001832static inline void xs_reclassify_socketu(struct socket *sock)
1833{
1834}
1835
Chuck Lever8945ee52007-08-06 11:58:04 -04001836static inline void xs_reclassify_socket4(struct socket *sock)
1837{
1838}
1839
1840static inline void xs_reclassify_socket6(struct socket *sock)
Peter Zijlstraed075362006-12-06 20:35:24 -08001841{
1842}
Pavel Emelyanov6bc96382010-10-04 16:56:38 +04001843
1844static inline void xs_reclassify_socket(int family, struct socket *sock)
1845{
1846}
Peter Zijlstraed075362006-12-06 20:35:24 -08001847#endif
1848
NeilBrown93dc41b2013-10-31 16:14:36 +11001849static void xs_dummy_setup_socket(struct work_struct *work)
1850{
1851}
1852
Pavel Emelyanov6bc96382010-10-04 16:56:38 +04001853static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1854 struct sock_xprt *transport, int family, int type, int protocol)
Pavel Emelyanov22f79322010-10-04 16:54:26 +04001855{
1856 struct socket *sock;
1857 int err;
1858
Pavel Emelyanov6bc96382010-10-04 16:56:38 +04001859 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
Pavel Emelyanov22f79322010-10-04 16:54:26 +04001860 if (err < 0) {
1861 dprintk("RPC: can't create %d transport socket (%d).\n",
1862 protocol, -err);
1863 goto out;
1864 }
Pavel Emelyanov6bc96382010-10-04 16:56:38 +04001865 xs_reclassify_socket(family, sock);
Pavel Emelyanov22f79322010-10-04 16:54:26 +04001866
Ben Hutchings4cea2882011-02-22 21:54:34 +00001867 err = xs_bind(transport, sock);
1868 if (err) {
Pavel Emelyanov22f79322010-10-04 16:54:26 +04001869 sock_release(sock);
1870 goto out;
1871 }
1872
1873 return sock;
1874out:
1875 return ERR_PTR(err);
1876}
1877
Chuck Lever176e21e2011-05-09 15:22:44 -04001878static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1879 struct socket *sock)
1880{
1881 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1882 xprt);
1883
1884 if (!transport->inet) {
1885 struct sock *sk = sock->sk;
1886
1887 write_lock_bh(&sk->sk_callback_lock);
1888
1889 xs_save_old_callbacks(transport, sk);
1890
1891 sk->sk_user_data = xprt;
1892 sk->sk_data_ready = xs_local_data_ready;
1893 sk->sk_write_space = xs_udp_write_space;
Trond Myklebust21180712013-12-31 13:22:59 -05001894 sk->sk_error_report = xs_error_report;
Chuck Lever176e21e2011-05-09 15:22:44 -04001895 sk->sk_allocation = GFP_ATOMIC;
1896
1897 xprt_clear_connected(xprt);
1898
1899 /* Reset to new socket */
1900 transport->sock = sock;
1901 transport->inet = sk;
1902
1903 write_unlock_bh(&sk->sk_callback_lock);
1904 }
1905
1906 /* Tell the socket layer to start connecting... */
1907 xprt->stat.connect_count++;
1908 xprt->stat.connect_start = jiffies;
1909 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
1910}
1911
1912/**
1913 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1914 * @xprt: RPC transport to connect
1915 * @transport: socket transport to connect
1916 * @create_sock: function to create a socket of the correct type
Chuck Lever176e21e2011-05-09 15:22:44 -04001917 */
J. Bruce Fieldsdc107402013-02-20 17:52:19 -05001918static int xs_local_setup_socket(struct sock_xprt *transport)
Chuck Lever176e21e2011-05-09 15:22:44 -04001919{
Chuck Lever176e21e2011-05-09 15:22:44 -04001920 struct rpc_xprt *xprt = &transport->xprt;
1921 struct socket *sock;
1922 int status = -EIO;
1923
Jeff Layton5cf02d02012-07-23 13:58:51 -04001924 current->flags |= PF_FSTRANS;
1925
Chuck Lever176e21e2011-05-09 15:22:44 -04001926 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1927 status = __sock_create(xprt->xprt_net, AF_LOCAL,
1928 SOCK_STREAM, 0, &sock, 1);
1929 if (status < 0) {
1930 dprintk("RPC: can't create AF_LOCAL "
1931 "transport socket (%d).\n", -status);
1932 goto out;
1933 }
1934 xs_reclassify_socketu(sock);
1935
1936 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
1937 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1938
1939 status = xs_local_finish_connecting(xprt, sock);
Trond Myklebust40b5ea02013-09-04 12:16:23 -04001940 trace_rpc_socket_connect(xprt, sock, status);
Chuck Lever176e21e2011-05-09 15:22:44 -04001941 switch (status) {
1942 case 0:
1943 dprintk("RPC: xprt %p connected to %s\n",
1944 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1945 xprt_set_connected(xprt);
1946 break;
1947 case -ENOENT:
1948 dprintk("RPC: xprt %p: socket %s does not exist\n",
1949 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1950 break;
Trond Myklebust4a20a982012-12-15 17:02:29 -05001951 case -ECONNREFUSED:
1952 dprintk("RPC: xprt %p: connection refused for %s\n",
1953 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1954 break;
Chuck Lever176e21e2011-05-09 15:22:44 -04001955 default:
1956 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
1957 __func__, -status,
1958 xprt->address_strings[RPC_DISPLAY_ADDR]);
1959 }
1960
1961out:
1962 xprt_clear_connecting(xprt);
1963 xprt_wake_pending_tasks(xprt, status);
Jeff Layton5cf02d02012-07-23 13:58:51 -04001964 current->flags &= ~PF_FSTRANS;
J. Bruce Fieldsdc107402013-02-20 17:52:19 -05001965 return status;
1966}
1967
Linus Torvaldsb6669732013-02-28 18:02:55 -08001968static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task)
J. Bruce Fieldsdc107402013-02-20 17:52:19 -05001969{
J. Bruce Fieldsdc107402013-02-20 17:52:19 -05001970 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1971 int ret;
1972
1973 if (RPC_IS_ASYNC(task)) {
1974 /*
1975 * We want the AF_LOCAL connect to be resolved in the
1976 * filesystem namespace of the process making the rpc
1977 * call. Thus we connect synchronously.
1978 *
1979 * If we want to support asynchronous AF_LOCAL calls,
1980 * we'll need to figure out how to pass a namespace to
1981 * connect.
1982 */
1983 rpc_exit(task, -ENOTCONN);
1984 return;
1985 }
1986 ret = xs_local_setup_socket(transport);
1987 if (ret && !RPC_IS_SOFTCONN(task))
1988 msleep_interruptible(15000);
Chuck Lever176e21e2011-05-09 15:22:44 -04001989}
1990
Mel Gormana564b8f2012-07-31 16:45:12 -07001991#ifdef CONFIG_SUNRPC_SWAP
1992static void xs_set_memalloc(struct rpc_xprt *xprt)
1993{
1994 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1995 xprt);
1996
1997 if (xprt->swapper)
1998 sk_set_memalloc(transport->inet);
1999}
2000
2001/**
2002 * xs_swapper - Tag this transport as being used for swap.
2003 * @xprt: transport to tag
2004 * @enable: enable/disable
2005 *
2006 */
2007int xs_swapper(struct rpc_xprt *xprt, int enable)
2008{
2009 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
2010 xprt);
2011 int err = 0;
2012
2013 if (enable) {
2014 xprt->swapper++;
2015 xs_set_memalloc(xprt);
2016 } else if (xprt->swapper) {
2017 xprt->swapper--;
2018 sk_clear_memalloc(transport->inet);
2019 }
2020
2021 return err;
2022}
2023EXPORT_SYMBOL_GPL(xs_swapper);
2024#else
2025static void xs_set_memalloc(struct rpc_xprt *xprt)
2026{
2027}
2028#endif
2029
Chuck Lever16be2d22007-08-06 11:57:38 -04002030static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
Chuck Levera246b012005-08-11 16:25:23 -04002031{
Chuck Lever16be2d22007-08-06 11:57:38 -04002032 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
Chuck Leveredb267a2006-08-22 20:06:18 -04002033
Chuck Leveree0ac0c2006-12-05 16:35:15 -05002034 if (!transport->inet) {
Chuck Leverb0d93ad2005-08-11 16:25:53 -04002035 struct sock *sk = sock->sk;
2036
2037 write_lock_bh(&sk->sk_callback_lock);
2038
Trond Myklebust2a9e1cf2008-10-28 15:21:39 -04002039 xs_save_old_callbacks(transport, sk);
2040
Chuck Leverb0d93ad2005-08-11 16:25:53 -04002041 sk->sk_user_data = xprt;
Chuck Leverb0d93ad2005-08-11 16:25:53 -04002042 sk->sk_data_ready = xs_udp_data_ready;
2043 sk->sk_write_space = xs_udp_write_space;
2044 sk->sk_no_check = UDP_CSUM_NORCV;
Trond Myklebustb079fa7b2005-12-13 16:13:52 -05002045 sk->sk_allocation = GFP_ATOMIC;
Chuck Leverb0d93ad2005-08-11 16:25:53 -04002046
2047 xprt_set_connected(xprt);
2048
2049 /* Reset to new socket */
Chuck Leveree0ac0c2006-12-05 16:35:15 -05002050 transport->sock = sock;
2051 transport->inet = sk;
Chuck Leverb0d93ad2005-08-11 16:25:53 -04002052
Mel Gormana564b8f2012-07-31 16:45:12 -07002053 xs_set_memalloc(xprt);
2054
Chuck Leverb0d93ad2005-08-11 16:25:53 -04002055 write_unlock_bh(&sk->sk_callback_lock);
2056 }
Chuck Lever470056c2005-08-25 16:25:56 -07002057 xs_udp_do_set_buffer_size(xprt);
Chuck Lever16be2d22007-08-06 11:57:38 -04002058}
2059
Pavel Emelyanov8c14ff22010-10-04 16:58:02 +04002060static void xs_udp_setup_socket(struct work_struct *work)
Chuck Levera246b012005-08-11 16:25:23 -04002061{
2062 struct sock_xprt *transport =
2063 container_of(work, struct sock_xprt, connect_worker.work);
2064 struct rpc_xprt *xprt = &transport->xprt;
2065 struct socket *sock = transport->sock;
Pavel Emelyanovb65c0312010-10-04 16:53:46 +04002066 int status = -EIO;
Chuck Levera246b012005-08-11 16:25:23 -04002067
Jeff Layton5cf02d02012-07-23 13:58:51 -04002068 current->flags |= PF_FSTRANS;
2069
Chuck Levera246b012005-08-11 16:25:23 -04002070 /* Start by resetting any existing state */
Chuck Leverfe315e72009-03-11 14:10:21 -04002071 xs_reset_transport(transport);
Pavel Emelyanov8c14ff22010-10-04 16:58:02 +04002072 sock = xs_create_sock(xprt, transport,
2073 xs_addr(xprt)->sa_family, SOCK_DGRAM, IPPROTO_UDP);
Pavel Emelyanovb65c0312010-10-04 16:53:46 +04002074 if (IS_ERR(sock))
Chuck Levera246b012005-08-11 16:25:23 -04002075 goto out;
Chuck Lever68e220b2007-08-06 11:57:48 -04002076
Chuck Leverc740eff2009-08-09 15:09:46 -04002077 dprintk("RPC: worker connecting xprt %p via %s to "
2078 "%s (port %s)\n", xprt,
2079 xprt->address_strings[RPC_DISPLAY_PROTO],
2080 xprt->address_strings[RPC_DISPLAY_ADDR],
2081 xprt->address_strings[RPC_DISPLAY_PORT]);
Chuck Lever68e220b2007-08-06 11:57:48 -04002082
2083 xs_udp_finish_connecting(xprt, sock);
Trond Myklebust40b5ea02013-09-04 12:16:23 -04002084 trace_rpc_socket_connect(xprt, sock, 0);
Chuck Levera246b012005-08-11 16:25:23 -04002085 status = 0;
Chuck Leverb0d93ad2005-08-11 16:25:53 -04002086out:
Chuck Leverb0d93ad2005-08-11 16:25:53 -04002087 xprt_clear_connecting(xprt);
Trond Myklebust7d1e8252009-03-11 14:38:03 -04002088 xprt_wake_pending_tasks(xprt, status);
Jeff Layton5cf02d02012-07-23 13:58:51 -04002089 current->flags &= ~PF_FSTRANS;
Chuck Leverb0d93ad2005-08-11 16:25:53 -04002090}
2091
Chuck Lever3167e122005-08-25 16:25:55 -07002092/*
2093 * We need to preserve the port number so the reply cache on the server can
2094 * find our cached RPC replies when we get around to reconnecting.
2095 */
Pavel Emelyanov58dddac2010-10-04 16:52:55 +04002096static void xs_abort_connection(struct sock_xprt *transport)
Chuck Lever3167e122005-08-25 16:25:55 -07002097{
2098 int result;
Chuck Lever3167e122005-08-25 16:25:55 -07002099 struct sockaddr any;
2100
Pavel Emelyanov58dddac2010-10-04 16:52:55 +04002101 dprintk("RPC: disconnecting xprt %p to reuse port\n", transport);
Chuck Lever3167e122005-08-25 16:25:55 -07002102
2103 /*
2104 * Disconnect the transport socket by doing a connect operation
2105 * with AF_UNSPEC. This should return immediately...
2106 */
2107 memset(&any, 0, sizeof(any));
2108 any.sa_family = AF_UNSPEC;
Chuck Leveree0ac0c2006-12-05 16:35:15 -05002109 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
Trond Myklebust40b5ea02013-09-04 12:16:23 -04002110 trace_rpc_socket_reset_connection(&transport->xprt,
2111 transport->sock, result);
Trond Myklebust7d1e8252009-03-11 14:38:03 -04002112 if (!result)
Trond Myklebust4bc1e682012-10-23 17:50:07 -04002113 xs_sock_reset_connection_flags(&transport->xprt);
2114 dprintk("RPC: AF_UNSPEC connect return code %d\n", result);
Chuck Lever3167e122005-08-25 16:25:55 -07002115}
2116
Pavel Emelyanov58dddac2010-10-04 16:52:55 +04002117static void xs_tcp_reuse_connection(struct sock_xprt *transport)
Trond Myklebust40d25492009-03-11 14:37:58 -04002118{
2119 unsigned int state = transport->inet->sk_state;
2120
Andy Chittenden669502f2010-08-10 10:19:53 -04002121 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) {
2122 /* we don't need to abort the connection if the socket
2123 * hasn't undergone a shutdown
2124 */
2125 if (transport->inet->sk_shutdown == 0)
2126 return;
2127 dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n",
2128 __func__, transport->inet->sk_shutdown);
2129 }
2130 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) {
2131 /* we don't need to abort the connection if the socket
2132 * hasn't undergone a shutdown
2133 */
2134 if (transport->inet->sk_shutdown == 0)
2135 return;
2136 dprintk("RPC: %s: ESTABLISHED/SYN_SENT "
2137 "sk_shutdown set to %d\n",
2138 __func__, transport->inet->sk_shutdown);
2139 }
Pavel Emelyanov58dddac2010-10-04 16:52:55 +04002140 xs_abort_connection(transport);
Trond Myklebust40d25492009-03-11 14:37:58 -04002141}
2142
Chuck Lever16be2d22007-08-06 11:57:38 -04002143static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
Chuck Leverb0d93ad2005-08-11 16:25:53 -04002144{
Chuck Lever16be2d22007-08-06 11:57:38 -04002145 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
Trond Myklebustfe19a962011-03-18 20:21:23 -04002146 int ret = -ENOTCONN;
Chuck Leveredb267a2006-08-22 20:06:18 -04002147
Chuck Leveree0ac0c2006-12-05 16:35:15 -05002148 if (!transport->inet) {
Chuck Leverb0d93ad2005-08-11 16:25:53 -04002149 struct sock *sk = sock->sk;
Trond Myklebust7f260e82013-09-24 11:25:22 -04002150 unsigned int keepidle = xprt->timeout->to_initval / HZ;
2151 unsigned int keepcnt = xprt->timeout->to_retries + 1;
2152 unsigned int opt_on = 1;
2153
2154 /* TCP Keepalive options */
2155 kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
2156 (char *)&opt_on, sizeof(opt_on));
2157 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE,
2158 (char *)&keepidle, sizeof(keepidle));
2159 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL,
2160 (char *)&keepidle, sizeof(keepidle));
2161 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT,
2162 (char *)&keepcnt, sizeof(keepcnt));
Chuck Leverb0d93ad2005-08-11 16:25:53 -04002163
2164 write_lock_bh(&sk->sk_callback_lock);
2165
Trond Myklebust2a9e1cf2008-10-28 15:21:39 -04002166 xs_save_old_callbacks(transport, sk);
2167
Chuck Leverb0d93ad2005-08-11 16:25:53 -04002168 sk->sk_user_data = xprt;
Chuck Leverb0d93ad2005-08-11 16:25:53 -04002169 sk->sk_data_ready = xs_tcp_data_ready;
2170 sk->sk_state_change = xs_tcp_state_change;
2171 sk->sk_write_space = xs_tcp_write_space;
Trond Myklebust21180712013-12-31 13:22:59 -05002172 sk->sk_error_report = xs_error_report;
Trond Myklebustb079fa7b2005-12-13 16:13:52 -05002173 sk->sk_allocation = GFP_ATOMIC;
Chuck Lever3167e122005-08-25 16:25:55 -07002174
2175 /* socket options */
2176 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
2177 sock_reset_flag(sk, SOCK_LINGER);
2178 tcp_sk(sk)->linger2 = 0;
2179 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
Chuck Leverb0d93ad2005-08-11 16:25:53 -04002180
2181 xprt_clear_connected(xprt);
2182
2183 /* Reset to new socket */
Chuck Leveree0ac0c2006-12-05 16:35:15 -05002184 transport->sock = sock;
2185 transport->inet = sk;
Chuck Leverb0d93ad2005-08-11 16:25:53 -04002186
2187 write_unlock_bh(&sk->sk_callback_lock);
2188 }
2189
Trond Myklebust01d37c42009-03-11 14:09:39 -04002190 if (!xprt_bound(xprt))
Trond Myklebustfe19a962011-03-18 20:21:23 -04002191 goto out;
Trond Myklebust01d37c42009-03-11 14:09:39 -04002192
Mel Gormana564b8f2012-07-31 16:45:12 -07002193 xs_set_memalloc(xprt);
2194
Chuck Leverb0d93ad2005-08-11 16:25:53 -04002195 /* Tell the socket layer to start connecting... */
Chuck Lever262ca072006-03-20 13:44:16 -05002196 xprt->stat.connect_count++;
2197 xprt->stat.connect_start = jiffies;
Trond Myklebustfe19a962011-03-18 20:21:23 -04002198 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2199 switch (ret) {
2200 case 0:
2201 case -EINPROGRESS:
2202 /* SYN_SENT! */
Trond Myklebustfe19a962011-03-18 20:21:23 -04002203 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2204 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2205 }
2206out:
2207 return ret;
Chuck Lever16be2d22007-08-06 11:57:38 -04002208}
2209
2210/**
Trond Myklebustb61d59f2009-03-11 14:38:04 -04002211 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2212 * @xprt: RPC transport to connect
2213 * @transport: socket transport to connect
2214 * @create_sock: function to create a socket of the correct type
Chuck Lever16be2d22007-08-06 11:57:38 -04002215 *
2216 * Invoked by a work queue tasklet.
2217 */
Pavel Emelyanovcdd518d2010-10-04 16:57:40 +04002218static void xs_tcp_setup_socket(struct work_struct *work)
Chuck Lever16be2d22007-08-06 11:57:38 -04002219{
Pavel Emelyanovcdd518d2010-10-04 16:57:40 +04002220 struct sock_xprt *transport =
2221 container_of(work, struct sock_xprt, connect_worker.work);
Chuck Lever16be2d22007-08-06 11:57:38 -04002222 struct socket *sock = transport->sock;
Pavel Emelyanova9f5f0f2010-10-04 16:52:25 +04002223 struct rpc_xprt *xprt = &transport->xprt;
Trond Myklebustb61d59f2009-03-11 14:38:04 -04002224 int status = -EIO;
Chuck Lever16be2d22007-08-06 11:57:38 -04002225
Jeff Layton5cf02d02012-07-23 13:58:51 -04002226 current->flags |= PF_FSTRANS;
2227
Chuck Lever16be2d22007-08-06 11:57:38 -04002228 if (!sock) {
Trond Myklebust7d1e8252009-03-11 14:38:03 -04002229 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
Pavel Emelyanovcdd518d2010-10-04 16:57:40 +04002230 sock = xs_create_sock(xprt, transport,
2231 xs_addr(xprt)->sa_family, SOCK_STREAM, IPPROTO_TCP);
Trond Myklebustb61d59f2009-03-11 14:38:04 -04002232 if (IS_ERR(sock)) {
2233 status = PTR_ERR(sock);
Chuck Lever16be2d22007-08-06 11:57:38 -04002234 goto out;
2235 }
Trond Myklebust7d1e8252009-03-11 14:38:03 -04002236 } else {
2237 int abort_and_exit;
2238
2239 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT,
2240 &xprt->state);
Chuck Lever16be2d22007-08-06 11:57:38 -04002241 /* "close" the socket, preserving the local port */
Pavel Emelyanov58dddac2010-10-04 16:52:55 +04002242 xs_tcp_reuse_connection(transport);
Chuck Lever16be2d22007-08-06 11:57:38 -04002243
Trond Myklebust7d1e8252009-03-11 14:38:03 -04002244 if (abort_and_exit)
2245 goto out_eagain;
2246 }
2247
Chuck Leverc740eff2009-08-09 15:09:46 -04002248 dprintk("RPC: worker connecting xprt %p via %s to "
2249 "%s (port %s)\n", xprt,
2250 xprt->address_strings[RPC_DISPLAY_PROTO],
2251 xprt->address_strings[RPC_DISPLAY_ADDR],
2252 xprt->address_strings[RPC_DISPLAY_PORT]);
Chuck Lever16be2d22007-08-06 11:57:38 -04002253
2254 status = xs_tcp_finish_connecting(xprt, sock);
Trond Myklebust40b5ea02013-09-04 12:16:23 -04002255 trace_rpc_socket_connect(xprt, sock, status);
Chuck Lever46121cf2007-01-31 12:14:08 -05002256 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2257 xprt, -status, xprt_connected(xprt),
2258 sock->sk->sk_state);
Trond Myklebust2a491992009-03-11 14:38:00 -04002259 switch (status) {
Trond Myklebustf75e6742009-04-21 17:18:20 -04002260 default:
2261 printk("%s: connect returned unhandled error %d\n",
2262 __func__, status);
2263 case -EADDRNOTAVAIL:
2264 /* We're probably in TIME_WAIT. Get rid of existing socket,
2265 * and retry
2266 */
Trond Myklebusta519fc72012-09-12 16:49:15 -04002267 xs_tcp_force_close(xprt);
Trond Myklebust88b5ed72009-06-17 13:22:57 -07002268 break;
Trond Myklebust2a491992009-03-11 14:38:00 -04002269 case 0:
2270 case -EINPROGRESS:
2271 case -EALREADY:
Trond Myklebust7d1e8252009-03-11 14:38:03 -04002272 xprt_clear_connecting(xprt);
Jeff Layton5cf02d02012-07-23 13:58:51 -04002273 current->flags &= ~PF_FSTRANS;
Trond Myklebust7d1e8252009-03-11 14:38:03 -04002274 return;
Trond Myklebust9fcfe0c2010-03-02 13:06:21 -05002275 case -EINVAL:
2276 /* Happens, for instance, if the user specified a link
2277 * local IPv6 address without a scope-id.
2278 */
Trond Myklebust3ed5e2a2013-03-04 17:29:33 -05002279 case -ECONNREFUSED:
2280 case -ECONNRESET:
2281 case -ENETUNREACH:
2282 /* retry with existing socket, after a delay */
Trond Myklebust9fcfe0c2010-03-02 13:06:21 -05002283 goto out;
Chuck Levera246b012005-08-11 16:25:23 -04002284 }
Trond Myklebust7d1e8252009-03-11 14:38:03 -04002285out_eagain:
Trond Myklebust2a491992009-03-11 14:38:00 -04002286 status = -EAGAIN;
Chuck Levera246b012005-08-11 16:25:23 -04002287out:
Chuck Lever2226feb2005-08-11 16:25:38 -04002288 xprt_clear_connecting(xprt);
Trond Myklebust7d1e8252009-03-11 14:38:03 -04002289 xprt_wake_pending_tasks(xprt, status);
Jeff Layton5cf02d02012-07-23 13:58:51 -04002290 current->flags &= ~PF_FSTRANS;
Chuck Levera246b012005-08-11 16:25:23 -04002291}
2292
Chuck Lever68e220b2007-08-06 11:57:48 -04002293/**
Chuck Lever9903cd12005-08-11 16:25:26 -04002294 * xs_connect - connect a socket to a remote endpoint
Trond Myklebust1b092092013-01-08 09:26:49 -05002295 * @xprt: pointer to transport structure
Chuck Lever9903cd12005-08-11 16:25:26 -04002296 * @task: address of RPC task that manages state of connect request
2297 *
2298 * TCP: If the remote end dropped the connection, delay reconnecting.
Chuck Lever03bf4b72005-08-25 16:25:55 -07002299 *
2300 * UDP socket connects are synchronous, but we use a work queue anyway
2301 * to guarantee that even unprivileged user processes can set up a
2302 * socket on a privileged port.
2303 *
2304 * If a UDP socket connect fails, the delay behavior here prevents
2305 * retry floods (hard mounts).
Chuck Lever9903cd12005-08-11 16:25:26 -04002306 */
Trond Myklebust1b092092013-01-08 09:26:49 -05002307static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
Chuck Levera246b012005-08-11 16:25:23 -04002308{
Chuck Leveree0ac0c2006-12-05 16:35:15 -05002309 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
Chuck Levera246b012005-08-11 16:25:23 -04002310
Chuck Lever09a21c42009-12-03 15:58:56 -05002311 if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) {
Chuck Lever46121cf2007-01-31 12:14:08 -05002312 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2313 "seconds\n",
Chuck Lever03bf4b72005-08-25 16:25:55 -07002314 xprt, xprt->reestablish_timeout / HZ);
Trond Myklebustc1384c92007-06-14 18:00:42 -04002315 queue_delayed_work(rpciod_workqueue,
2316 &transport->connect_worker,
2317 xprt->reestablish_timeout);
Chuck Lever03bf4b72005-08-25 16:25:55 -07002318 xprt->reestablish_timeout <<= 1;
Neil Brown61d0a8e2009-09-23 14:36:37 -04002319 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2320 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
Chuck Lever03bf4b72005-08-25 16:25:55 -07002321 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
2322 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
Chuck Leverb0d93ad2005-08-11 16:25:53 -04002323 } else {
Chuck Lever46121cf2007-01-31 12:14:08 -05002324 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
Trond Myklebustc1384c92007-06-14 18:00:42 -04002325 queue_delayed_work(rpciod_workqueue,
2326 &transport->connect_worker, 0);
Chuck Levera246b012005-08-11 16:25:23 -04002327 }
2328}
2329
Chuck Lever262ca072006-03-20 13:44:16 -05002330/**
Chuck Lever176e21e2011-05-09 15:22:44 -04002331 * xs_local_print_stats - display AF_LOCAL socket-specifc stats
2332 * @xprt: rpc_xprt struct containing statistics
2333 * @seq: output file
2334 *
2335 */
2336static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2337{
2338 long idle_time = 0;
2339
2340 if (xprt_connected(xprt))
2341 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2342
2343 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
Andy Adamson15a45202012-02-14 16:19:18 -05002344 "%llu %llu %lu %llu %llu\n",
Chuck Lever176e21e2011-05-09 15:22:44 -04002345 xprt->stat.bind_count,
2346 xprt->stat.connect_count,
2347 xprt->stat.connect_time,
2348 idle_time,
2349 xprt->stat.sends,
2350 xprt->stat.recvs,
2351 xprt->stat.bad_xids,
2352 xprt->stat.req_u,
Andy Adamson15a45202012-02-14 16:19:18 -05002353 xprt->stat.bklog_u,
2354 xprt->stat.max_slots,
2355 xprt->stat.sending_u,
2356 xprt->stat.pending_u);
Chuck Lever176e21e2011-05-09 15:22:44 -04002357}
2358
2359/**
Chuck Lever262ca072006-03-20 13:44:16 -05002360 * xs_udp_print_stats - display UDP socket-specifc stats
2361 * @xprt: rpc_xprt struct containing statistics
2362 * @seq: output file
2363 *
2364 */
2365static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2366{
Chuck Leverc8475462006-12-05 16:35:26 -05002367 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2368
Andy Adamson15a45202012-02-14 16:19:18 -05002369 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2370 "%lu %llu %llu\n",
Chuck Leverfbfffbd2009-08-09 15:09:46 -04002371 transport->srcport,
Chuck Lever262ca072006-03-20 13:44:16 -05002372 xprt->stat.bind_count,
2373 xprt->stat.sends,
2374 xprt->stat.recvs,
2375 xprt->stat.bad_xids,
2376 xprt->stat.req_u,
Andy Adamson15a45202012-02-14 16:19:18 -05002377 xprt->stat.bklog_u,
2378 xprt->stat.max_slots,
2379 xprt->stat.sending_u,
2380 xprt->stat.pending_u);
Chuck Lever262ca072006-03-20 13:44:16 -05002381}
2382
2383/**
2384 * xs_tcp_print_stats - display TCP socket-specifc stats
2385 * @xprt: rpc_xprt struct containing statistics
2386 * @seq: output file
2387 *
2388 */
2389static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2390{
Chuck Leverc8475462006-12-05 16:35:26 -05002391 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
Chuck Lever262ca072006-03-20 13:44:16 -05002392 long idle_time = 0;
2393
2394 if (xprt_connected(xprt))
2395 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2396
Andy Adamson15a45202012-02-14 16:19:18 -05002397 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2398 "%llu %llu %lu %llu %llu\n",
Chuck Leverfbfffbd2009-08-09 15:09:46 -04002399 transport->srcport,
Chuck Lever262ca072006-03-20 13:44:16 -05002400 xprt->stat.bind_count,
2401 xprt->stat.connect_count,
2402 xprt->stat.connect_time,
2403 idle_time,
2404 xprt->stat.sends,
2405 xprt->stat.recvs,
2406 xprt->stat.bad_xids,
2407 xprt->stat.req_u,
Andy Adamson15a45202012-02-14 16:19:18 -05002408 xprt->stat.bklog_u,
2409 xprt->stat.max_slots,
2410 xprt->stat.sending_u,
2411 xprt->stat.pending_u);
Chuck Lever262ca072006-03-20 13:44:16 -05002412}
2413
Rahul Iyer4cfc7e62009-09-10 17:32:28 +03002414/*
2415 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2416 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2417 * to use the server side send routines.
2418 */
H Hartley Sweeten5a51f132010-01-14 15:38:31 -07002419static void *bc_malloc(struct rpc_task *task, size_t size)
Rahul Iyer4cfc7e62009-09-10 17:32:28 +03002420{
2421 struct page *page;
2422 struct rpc_buffer *buf;
2423
Weston Andros Adamsonb8a13d02012-10-23 10:43:43 -04002424 WARN_ON_ONCE(size > PAGE_SIZE - sizeof(struct rpc_buffer));
2425 if (size > PAGE_SIZE - sizeof(struct rpc_buffer))
2426 return NULL;
Rahul Iyer4cfc7e62009-09-10 17:32:28 +03002427
Weston Andros Adamsonb8a13d02012-10-23 10:43:43 -04002428 page = alloc_page(GFP_KERNEL);
Rahul Iyer4cfc7e62009-09-10 17:32:28 +03002429 if (!page)
2430 return NULL;
2431
2432 buf = page_address(page);
2433 buf->len = PAGE_SIZE;
2434
2435 return buf->data;
2436}
2437
2438/*
2439 * Free the space allocated in the bc_alloc routine
2440 */
H Hartley Sweeten5a51f132010-01-14 15:38:31 -07002441static void bc_free(void *buffer)
Rahul Iyer4cfc7e62009-09-10 17:32:28 +03002442{
2443 struct rpc_buffer *buf;
2444
2445 if (!buffer)
2446 return;
2447
2448 buf = container_of(buffer, struct rpc_buffer, data);
2449 free_page((unsigned long)buf);
2450}
2451
2452/*
2453 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2454 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2455 */
2456static int bc_sendto(struct rpc_rqst *req)
2457{
2458 int len;
2459 struct xdr_buf *xbufp = &req->rq_snd_buf;
2460 struct rpc_xprt *xprt = req->rq_xprt;
2461 struct sock_xprt *transport =
2462 container_of(xprt, struct sock_xprt, xprt);
2463 struct socket *sock = transport->sock;
2464 unsigned long headoff;
2465 unsigned long tailoff;
2466
Chuck Lever61677ee2011-05-09 15:22:34 -04002467 xs_encode_stream_record_marker(xbufp);
Rahul Iyer4cfc7e62009-09-10 17:32:28 +03002468
2469 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
2470 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
2471 len = svc_send_common(sock, xbufp,
2472 virt_to_page(xbufp->head[0].iov_base), headoff,
2473 xbufp->tail[0].iov_base, tailoff);
2474
2475 if (len != xbufp->len) {
2476 printk(KERN_NOTICE "Error sending entire callback!\n");
2477 len = -EAGAIN;
2478 }
2479
2480 return len;
2481}
2482
2483/*
2484 * The send routine. Borrows from svc_send
2485 */
2486static int bc_send_request(struct rpc_task *task)
2487{
2488 struct rpc_rqst *req = task->tk_rqstp;
2489 struct svc_xprt *xprt;
Rahul Iyer4cfc7e62009-09-10 17:32:28 +03002490 u32 len;
2491
2492 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
2493 /*
2494 * Get the server socket associated with this callback xprt
2495 */
2496 xprt = req->rq_xprt->bc_xprt;
Rahul Iyer4cfc7e62009-09-10 17:32:28 +03002497
2498 /*
2499 * Grab the mutex to serialize data as the connection is shared
2500 * with the fore channel
2501 */
2502 if (!mutex_trylock(&xprt->xpt_mutex)) {
2503 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
2504 if (!mutex_trylock(&xprt->xpt_mutex))
2505 return -EAGAIN;
2506 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
2507 }
2508 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2509 len = -ENOTCONN;
2510 else
2511 len = bc_sendto(req);
2512 mutex_unlock(&xprt->xpt_mutex);
2513
2514 if (len > 0)
2515 len = 0;
2516
2517 return len;
2518}
2519
2520/*
2521 * The close routine. Since this is client initiated, we do nothing
2522 */
2523
2524static void bc_close(struct rpc_xprt *xprt)
2525{
Rahul Iyer4cfc7e62009-09-10 17:32:28 +03002526}
2527
2528/*
2529 * The xprt destroy routine. Again, because this connection is client
2530 * initiated, we do nothing
2531 */
2532
2533static void bc_destroy(struct rpc_xprt *xprt)
2534{
Rahul Iyer4cfc7e62009-09-10 17:32:28 +03002535}
2536
Chuck Lever176e21e2011-05-09 15:22:44 -04002537static struct rpc_xprt_ops xs_local_ops = {
2538 .reserve_xprt = xprt_reserve_xprt,
2539 .release_xprt = xs_tcp_release_xprt,
Trond Myklebustf39c1bf2012-09-07 11:08:50 -04002540 .alloc_slot = xprt_alloc_slot,
Chuck Lever176e21e2011-05-09 15:22:44 -04002541 .rpcbind = xs_local_rpcbind,
2542 .set_port = xs_local_set_port,
J. Bruce Fieldsdc107402013-02-20 17:52:19 -05002543 .connect = xs_local_connect,
Chuck Lever176e21e2011-05-09 15:22:44 -04002544 .buf_alloc = rpc_malloc,
2545 .buf_free = rpc_free,
2546 .send_request = xs_local_send_request,
2547 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2548 .close = xs_close,
Trond Myklebusta1311d82013-10-31 09:18:49 -04002549 .destroy = xs_destroy,
Chuck Lever176e21e2011-05-09 15:22:44 -04002550 .print_stats = xs_local_print_stats,
2551};
2552
Chuck Lever262965f2005-08-11 16:25:56 -04002553static struct rpc_xprt_ops xs_udp_ops = {
Chuck Lever43118c22005-08-25 16:25:49 -07002554 .set_buffer_size = xs_udp_set_buffer_size,
Chuck Lever12a80462005-08-25 16:25:51 -07002555 .reserve_xprt = xprt_reserve_xprt_cong,
Chuck Lever49e9a892005-08-25 16:25:51 -07002556 .release_xprt = xprt_release_xprt_cong,
Trond Myklebustf39c1bf2012-09-07 11:08:50 -04002557 .alloc_slot = xprt_alloc_slot,
Chuck Lever45160d62007-07-01 12:13:17 -04002558 .rpcbind = rpcb_getport_async,
Chuck Lever92200412006-01-03 09:55:51 +01002559 .set_port = xs_set_port,
Chuck Lever9903cd12005-08-11 16:25:26 -04002560 .connect = xs_connect,
Chuck Lever02107142006-01-03 09:55:49 +01002561 .buf_alloc = rpc_malloc,
2562 .buf_free = rpc_free,
Chuck Lever262965f2005-08-11 16:25:56 -04002563 .send_request = xs_udp_send_request,
Chuck Leverfe3aca22005-08-25 16:25:50 -07002564 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
Chuck Lever46c0ee82005-08-25 16:25:52 -07002565 .timer = xs_udp_timer,
Chuck Levera58dd392005-08-25 16:25:53 -07002566 .release_request = xprt_release_rqst_cong,
Chuck Lever262965f2005-08-11 16:25:56 -04002567 .close = xs_close,
2568 .destroy = xs_destroy,
Chuck Lever262ca072006-03-20 13:44:16 -05002569 .print_stats = xs_udp_print_stats,
Chuck Lever262965f2005-08-11 16:25:56 -04002570};
2571
2572static struct rpc_xprt_ops xs_tcp_ops = {
Chuck Lever12a80462005-08-25 16:25:51 -07002573 .reserve_xprt = xprt_reserve_xprt,
Trond Myklebuste0ab53d2006-07-27 17:22:50 -04002574 .release_xprt = xs_tcp_release_xprt,
Trond Myklebustf39c1bf2012-09-07 11:08:50 -04002575 .alloc_slot = xprt_lock_and_alloc_slot,
Chuck Lever45160d62007-07-01 12:13:17 -04002576 .rpcbind = rpcb_getport_async,
Chuck Lever92200412006-01-03 09:55:51 +01002577 .set_port = xs_set_port,
Trond Myklebust0b9e7942010-04-16 16:41:57 -04002578 .connect = xs_connect,
Chuck Lever02107142006-01-03 09:55:49 +01002579 .buf_alloc = rpc_malloc,
2580 .buf_free = rpc_free,
Chuck Lever262965f2005-08-11 16:25:56 -04002581 .send_request = xs_tcp_send_request,
Chuck Leverfe3aca22005-08-25 16:25:50 -07002582 .set_retrans_timeout = xprt_set_retrans_timeout_def,
Trond Myklebustf75e6742009-04-21 17:18:20 -04002583 .close = xs_tcp_close,
Chuck Lever9903cd12005-08-11 16:25:26 -04002584 .destroy = xs_destroy,
Chuck Lever262ca072006-03-20 13:44:16 -05002585 .print_stats = xs_tcp_print_stats,
Chuck Levera246b012005-08-11 16:25:23 -04002586};
2587
Rahul Iyer4cfc7e62009-09-10 17:32:28 +03002588/*
2589 * The rpc_xprt_ops for the server backchannel
2590 */
2591
2592static struct rpc_xprt_ops bc_tcp_ops = {
2593 .reserve_xprt = xprt_reserve_xprt,
2594 .release_xprt = xprt_release_xprt,
Bryan Schumaker84e28a32012-09-24 13:39:01 -04002595 .alloc_slot = xprt_alloc_slot,
Rahul Iyer4cfc7e62009-09-10 17:32:28 +03002596 .buf_alloc = bc_malloc,
2597 .buf_free = bc_free,
2598 .send_request = bc_send_request,
2599 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2600 .close = bc_close,
2601 .destroy = bc_destroy,
2602 .print_stats = xs_tcp_print_stats,
2603};
2604
Chuck Lever92476852010-10-20 11:53:01 -04002605static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2606{
2607 static const struct sockaddr_in sin = {
2608 .sin_family = AF_INET,
2609 .sin_addr.s_addr = htonl(INADDR_ANY),
2610 };
2611 static const struct sockaddr_in6 sin6 = {
2612 .sin6_family = AF_INET6,
2613 .sin6_addr = IN6ADDR_ANY_INIT,
2614 };
2615
2616 switch (family) {
Chuck Lever176e21e2011-05-09 15:22:44 -04002617 case AF_LOCAL:
2618 break;
Chuck Lever92476852010-10-20 11:53:01 -04002619 case AF_INET:
2620 memcpy(sap, &sin, sizeof(sin));
2621 break;
2622 case AF_INET6:
2623 memcpy(sap, &sin6, sizeof(sin6));
2624 break;
2625 default:
2626 dprintk("RPC: %s: Bad address family\n", __func__);
2627 return -EAFNOSUPPORT;
2628 }
2629 return 0;
2630}
2631
\"Talpey, Thomas\3c341b0b2007-09-10 13:47:07 -04002632static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
Trond Myklebustd9ba1312011-07-17 18:11:30 -04002633 unsigned int slot_table_size,
2634 unsigned int max_slot_table_size)
Chuck Leverc8541ec2006-10-17 14:44:27 -04002635{
2636 struct rpc_xprt *xprt;
Chuck Leverffc2e512006-12-05 16:35:11 -05002637 struct sock_xprt *new;
Chuck Leverc8541ec2006-10-17 14:44:27 -04002638
Frank van Maarseveen96802a02007-07-08 13:08:54 +02002639 if (args->addrlen > sizeof(xprt->addr)) {
Chuck Lever46121cf2007-01-31 12:14:08 -05002640 dprintk("RPC: xs_setup_xprt: address too large\n");
Chuck Leverc8541ec2006-10-17 14:44:27 -04002641 return ERR_PTR(-EBADF);
2642 }
2643
Trond Myklebustd9ba1312011-07-17 18:11:30 -04002644 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
2645 max_slot_table_size);
Pavel Emelyanovbd1722d2010-09-29 16:02:43 +04002646 if (xprt == NULL) {
Chuck Lever46121cf2007-01-31 12:14:08 -05002647 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2648 "rpc_xprt\n");
Chuck Leverc8541ec2006-10-17 14:44:27 -04002649 return ERR_PTR(-ENOMEM);
2650 }
2651
Pavel Emelyanovbd1722d2010-09-29 16:02:43 +04002652 new = container_of(xprt, struct sock_xprt, xprt);
Frank van Maarseveen96802a02007-07-08 13:08:54 +02002653 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2654 xprt->addrlen = args->addrlen;
Frank van Maarseveend3bc9a12007-07-09 22:23:35 +02002655 if (args->srcaddr)
Chuck Leverfbfffbd2009-08-09 15:09:46 -04002656 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
Chuck Lever92476852010-10-20 11:53:01 -04002657 else {
2658 int err;
2659 err = xs_init_anyaddr(args->dstaddr->sa_family,
2660 (struct sockaddr *)&new->srcaddr);
Stanislav Kinsbursky2aa13532011-11-10 14:33:23 +03002661 if (err != 0) {
2662 xprt_free(xprt);
Chuck Lever92476852010-10-20 11:53:01 -04002663 return ERR_PTR(err);
Stanislav Kinsbursky2aa13532011-11-10 14:33:23 +03002664 }
Chuck Lever92476852010-10-20 11:53:01 -04002665 }
Chuck Leverc8541ec2006-10-17 14:44:27 -04002666
2667 return xprt;
2668}
2669
Chuck Lever176e21e2011-05-09 15:22:44 -04002670static const struct rpc_timeout xs_local_default_timeout = {
2671 .to_initval = 10 * HZ,
2672 .to_maxval = 10 * HZ,
2673 .to_retries = 2,
2674};
2675
2676/**
2677 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2678 * @args: rpc transport creation arguments
2679 *
2680 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2681 */
2682static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
2683{
2684 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
2685 struct sock_xprt *transport;
2686 struct rpc_xprt *xprt;
2687 struct rpc_xprt *ret;
2688
Trond Myklebustd9ba1312011-07-17 18:11:30 -04002689 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2690 xprt_max_tcp_slot_table_entries);
Chuck Lever176e21e2011-05-09 15:22:44 -04002691 if (IS_ERR(xprt))
2692 return xprt;
2693 transport = container_of(xprt, struct sock_xprt, xprt);
2694
2695 xprt->prot = 0;
2696 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2697 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2698
2699 xprt->bind_timeout = XS_BIND_TO;
2700 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2701 xprt->idle_timeout = XS_IDLE_DISC_TO;
2702
2703 xprt->ops = &xs_local_ops;
2704 xprt->timeout = &xs_local_default_timeout;
2705
NeilBrown93dc41b2013-10-31 16:14:36 +11002706 INIT_DELAYED_WORK(&transport->connect_worker,
2707 xs_dummy_setup_socket);
2708
Chuck Lever176e21e2011-05-09 15:22:44 -04002709 switch (sun->sun_family) {
2710 case AF_LOCAL:
2711 if (sun->sun_path[0] != '/') {
2712 dprintk("RPC: bad AF_LOCAL address: %s\n",
2713 sun->sun_path);
2714 ret = ERR_PTR(-EINVAL);
2715 goto out_err;
2716 }
2717 xprt_set_bound(xprt);
Chuck Lever176e21e2011-05-09 15:22:44 -04002718 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
J. Bruce Fields7073ea82013-02-21 10:14:22 -05002719 ret = ERR_PTR(xs_local_setup_socket(transport));
2720 if (ret)
2721 goto out_err;
Chuck Lever176e21e2011-05-09 15:22:44 -04002722 break;
2723 default:
2724 ret = ERR_PTR(-EAFNOSUPPORT);
2725 goto out_err;
2726 }
2727
2728 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2729 xprt->address_strings[RPC_DISPLAY_ADDR]);
2730
2731 if (try_module_get(THIS_MODULE))
2732 return xprt;
2733 ret = ERR_PTR(-EINVAL);
2734out_err:
2735 xprt_free(xprt);
2736 return ret;
2737}
2738
Trond Myklebust2881ae72007-12-20 16:03:54 -05002739static const struct rpc_timeout xs_udp_default_timeout = {
2740 .to_initval = 5 * HZ,
2741 .to_maxval = 30 * HZ,
2742 .to_increment = 5 * HZ,
2743 .to_retries = 5,
2744};
2745
Chuck Lever9903cd12005-08-11 16:25:26 -04002746/**
2747 * xs_setup_udp - Set up transport to use a UDP socket
Frank van Maarseveen96802a02007-07-08 13:08:54 +02002748 * @args: rpc transport creation arguments
Chuck Lever9903cd12005-08-11 16:25:26 -04002749 *
2750 */
Adrian Bunk483066d2007-10-24 18:24:02 +02002751static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
Chuck Levera246b012005-08-11 16:25:23 -04002752{
Chuck Lever8f9d5b12007-08-06 11:57:53 -04002753 struct sockaddr *addr = args->dstaddr;
Chuck Leverc8541ec2006-10-17 14:44:27 -04002754 struct rpc_xprt *xprt;
Chuck Leverc8475462006-12-05 16:35:26 -05002755 struct sock_xprt *transport;
J. Bruce Fields0a68b0b2010-05-26 08:42:24 -04002756 struct rpc_xprt *ret;
Chuck Levera246b012005-08-11 16:25:23 -04002757
Trond Myklebustd9ba1312011-07-17 18:11:30 -04002758 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
2759 xprt_udp_slot_table_entries);
Chuck Leverc8541ec2006-10-17 14:44:27 -04002760 if (IS_ERR(xprt))
2761 return xprt;
Chuck Leverc8475462006-12-05 16:35:26 -05002762 transport = container_of(xprt, struct sock_xprt, xprt);
Chuck Levera246b012005-08-11 16:25:23 -04002763
Chuck Leverec739ef2006-08-22 20:06:15 -04002764 xprt->prot = IPPROTO_UDP;
Chuck Lever808012f2005-08-25 16:25:49 -07002765 xprt->tsh_size = 0;
Chuck Levera246b012005-08-11 16:25:23 -04002766 /* XXX: header size can vary due to auth type, IPv6, etc. */
2767 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2768
Chuck Lever03bf4b72005-08-25 16:25:55 -07002769 xprt->bind_timeout = XS_BIND_TO;
Chuck Lever03bf4b72005-08-25 16:25:55 -07002770 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2771 xprt->idle_timeout = XS_IDLE_DISC_TO;
Chuck Levera246b012005-08-11 16:25:23 -04002772
Chuck Lever262965f2005-08-11 16:25:56 -04002773 xprt->ops = &xs_udp_ops;
Chuck Levera246b012005-08-11 16:25:23 -04002774
Trond Myklebustba7392b2007-12-20 16:03:55 -05002775 xprt->timeout = &xs_udp_default_timeout;
Chuck Levera246b012005-08-11 16:25:23 -04002776
Chuck Lever8f9d5b12007-08-06 11:57:53 -04002777 switch (addr->sa_family) {
2778 case AF_INET:
2779 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2780 xprt_set_bound(xprt);
2781
2782 INIT_DELAYED_WORK(&transport->connect_worker,
Pavel Emelyanov8c14ff22010-10-04 16:58:02 +04002783 xs_udp_setup_socket);
Chuck Lever9dc3b092009-08-09 15:09:46 -04002784 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
Chuck Lever8f9d5b12007-08-06 11:57:53 -04002785 break;
2786 case AF_INET6:
2787 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2788 xprt_set_bound(xprt);
2789
2790 INIT_DELAYED_WORK(&transport->connect_worker,
Pavel Emelyanov8c14ff22010-10-04 16:58:02 +04002791 xs_udp_setup_socket);
Chuck Lever9dc3b092009-08-09 15:09:46 -04002792 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
Chuck Lever8f9d5b12007-08-06 11:57:53 -04002793 break;
2794 default:
J. Bruce Fields0a68b0b2010-05-26 08:42:24 -04002795 ret = ERR_PTR(-EAFNOSUPPORT);
2796 goto out_err;
Chuck Lever8f9d5b12007-08-06 11:57:53 -04002797 }
2798
Chuck Leverc740eff2009-08-09 15:09:46 -04002799 if (xprt_bound(xprt))
2800 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2801 xprt->address_strings[RPC_DISPLAY_ADDR],
2802 xprt->address_strings[RPC_DISPLAY_PORT],
2803 xprt->address_strings[RPC_DISPLAY_PROTO]);
2804 else
2805 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2806 xprt->address_strings[RPC_DISPLAY_ADDR],
2807 xprt->address_strings[RPC_DISPLAY_PROTO]);
Chuck Leveredb267a2006-08-22 20:06:18 -04002808
\"Talpey, Thomas\bc255712007-09-10 13:46:39 -04002809 if (try_module_get(THIS_MODULE))
2810 return xprt;
J. Bruce Fields0a68b0b2010-05-26 08:42:24 -04002811 ret = ERR_PTR(-EINVAL);
2812out_err:
Pavel Emelyanove204e622010-09-29 16:03:13 +04002813 xprt_free(xprt);
J. Bruce Fields0a68b0b2010-05-26 08:42:24 -04002814 return ret;
Chuck Levera246b012005-08-11 16:25:23 -04002815}
2816
Trond Myklebust2881ae72007-12-20 16:03:54 -05002817static const struct rpc_timeout xs_tcp_default_timeout = {
2818 .to_initval = 60 * HZ,
2819 .to_maxval = 60 * HZ,
2820 .to_retries = 2,
2821};
2822
Chuck Lever9903cd12005-08-11 16:25:26 -04002823/**
2824 * xs_setup_tcp - Set up transport to use a TCP socket
Frank van Maarseveen96802a02007-07-08 13:08:54 +02002825 * @args: rpc transport creation arguments
Chuck Lever9903cd12005-08-11 16:25:26 -04002826 *
2827 */
Adrian Bunk483066d2007-10-24 18:24:02 +02002828static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
Chuck Levera246b012005-08-11 16:25:23 -04002829{
Chuck Lever8f9d5b12007-08-06 11:57:53 -04002830 struct sockaddr *addr = args->dstaddr;
Chuck Leverc8541ec2006-10-17 14:44:27 -04002831 struct rpc_xprt *xprt;
Chuck Leverc8475462006-12-05 16:35:26 -05002832 struct sock_xprt *transport;
J. Bruce Fields0a68b0b2010-05-26 08:42:24 -04002833 struct rpc_xprt *ret;
Trond Myklebustb7993ce2013-04-14 11:42:00 -04002834 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
2835
2836 if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
2837 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
Chuck Levera246b012005-08-11 16:25:23 -04002838
Trond Myklebustd9ba1312011-07-17 18:11:30 -04002839 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
Trond Myklebustb7993ce2013-04-14 11:42:00 -04002840 max_slot_table_size);
Chuck Leverc8541ec2006-10-17 14:44:27 -04002841 if (IS_ERR(xprt))
2842 return xprt;
Chuck Leverc8475462006-12-05 16:35:26 -05002843 transport = container_of(xprt, struct sock_xprt, xprt);
Chuck Levera246b012005-08-11 16:25:23 -04002844
Chuck Leverec739ef2006-08-22 20:06:15 -04002845 xprt->prot = IPPROTO_TCP;
Chuck Lever808012f2005-08-25 16:25:49 -07002846 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
Chuck Lever808012f2005-08-25 16:25:49 -07002847 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
Chuck Levera246b012005-08-11 16:25:23 -04002848
Chuck Lever03bf4b72005-08-25 16:25:55 -07002849 xprt->bind_timeout = XS_BIND_TO;
Chuck Lever03bf4b72005-08-25 16:25:55 -07002850 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2851 xprt->idle_timeout = XS_IDLE_DISC_TO;
Chuck Levera246b012005-08-11 16:25:23 -04002852
Chuck Lever262965f2005-08-11 16:25:56 -04002853 xprt->ops = &xs_tcp_ops;
Trond Myklebustba7392b2007-12-20 16:03:55 -05002854 xprt->timeout = &xs_tcp_default_timeout;
Chuck Levera246b012005-08-11 16:25:23 -04002855
Chuck Lever8f9d5b12007-08-06 11:57:53 -04002856 switch (addr->sa_family) {
2857 case AF_INET:
2858 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2859 xprt_set_bound(xprt);
2860
Chuck Lever9dc3b092009-08-09 15:09:46 -04002861 INIT_DELAYED_WORK(&transport->connect_worker,
Pavel Emelyanovcdd518d2010-10-04 16:57:40 +04002862 xs_tcp_setup_socket);
Chuck Lever9dc3b092009-08-09 15:09:46 -04002863 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
Chuck Lever8f9d5b12007-08-06 11:57:53 -04002864 break;
2865 case AF_INET6:
2866 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2867 xprt_set_bound(xprt);
2868
Chuck Lever9dc3b092009-08-09 15:09:46 -04002869 INIT_DELAYED_WORK(&transport->connect_worker,
Pavel Emelyanovcdd518d2010-10-04 16:57:40 +04002870 xs_tcp_setup_socket);
Chuck Lever9dc3b092009-08-09 15:09:46 -04002871 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
Chuck Lever8f9d5b12007-08-06 11:57:53 -04002872 break;
2873 default:
J. Bruce Fields0a68b0b2010-05-26 08:42:24 -04002874 ret = ERR_PTR(-EAFNOSUPPORT);
2875 goto out_err;
Chuck Lever8f9d5b12007-08-06 11:57:53 -04002876 }
2877
Chuck Leverc740eff2009-08-09 15:09:46 -04002878 if (xprt_bound(xprt))
2879 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2880 xprt->address_strings[RPC_DISPLAY_ADDR],
2881 xprt->address_strings[RPC_DISPLAY_PORT],
2882 xprt->address_strings[RPC_DISPLAY_PROTO]);
2883 else
2884 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2885 xprt->address_strings[RPC_DISPLAY_ADDR],
2886 xprt->address_strings[RPC_DISPLAY_PROTO]);
2887
Chuck Leveredb267a2006-08-22 20:06:18 -04002888
\"Talpey, Thomas\bc255712007-09-10 13:46:39 -04002889 if (try_module_get(THIS_MODULE))
2890 return xprt;
J. Bruce Fields0a68b0b2010-05-26 08:42:24 -04002891 ret = ERR_PTR(-EINVAL);
2892out_err:
Pavel Emelyanove204e622010-09-29 16:03:13 +04002893 xprt_free(xprt);
J. Bruce Fields0a68b0b2010-05-26 08:42:24 -04002894 return ret;
Chuck Levera246b012005-08-11 16:25:23 -04002895}
Chuck Lever282b32e2006-12-05 16:35:51 -05002896
Alexandros Batsakisf300bab2009-09-10 17:33:30 +03002897/**
2898 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2899 * @args: rpc transport creation arguments
2900 *
2901 */
2902static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
2903{
2904 struct sockaddr *addr = args->dstaddr;
2905 struct rpc_xprt *xprt;
2906 struct sock_xprt *transport;
2907 struct svc_sock *bc_sock;
J. Bruce Fields0a68b0b2010-05-26 08:42:24 -04002908 struct rpc_xprt *ret;
Alexandros Batsakisf300bab2009-09-10 17:33:30 +03002909
J. Bruce Fieldsf0418aa2010-12-08 13:48:19 -05002910 if (args->bc_xprt->xpt_bc_xprt) {
2911 /*
2912 * This server connection already has a backchannel
J. Bruce Fieldse3bfab12013-10-02 09:48:15 -04002913 * transport; we can't create a new one, as we wouldn't
2914 * be able to match replies based on xid any more. So,
J. Bruce Fieldsf0418aa2010-12-08 13:48:19 -05002915 * reuse the already-existing one:
2916 */
2917 return args->bc_xprt->xpt_bc_xprt;
2918 }
Trond Myklebustd9ba1312011-07-17 18:11:30 -04002919 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2920 xprt_tcp_slot_table_entries);
Alexandros Batsakisf300bab2009-09-10 17:33:30 +03002921 if (IS_ERR(xprt))
2922 return xprt;
2923 transport = container_of(xprt, struct sock_xprt, xprt);
2924
2925 xprt->prot = IPPROTO_TCP;
2926 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2927 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2928 xprt->timeout = &xs_tcp_default_timeout;
2929
2930 /* backchannel */
2931 xprt_set_bound(xprt);
2932 xprt->bind_timeout = 0;
Alexandros Batsakisf300bab2009-09-10 17:33:30 +03002933 xprt->reestablish_timeout = 0;
2934 xprt->idle_timeout = 0;
2935
Alexandros Batsakisf300bab2009-09-10 17:33:30 +03002936 xprt->ops = &bc_tcp_ops;
2937
2938 switch (addr->sa_family) {
2939 case AF_INET:
2940 xs_format_peer_addresses(xprt, "tcp",
2941 RPCBIND_NETID_TCP);
2942 break;
2943 case AF_INET6:
2944 xs_format_peer_addresses(xprt, "tcp",
2945 RPCBIND_NETID_TCP6);
2946 break;
2947 default:
J. Bruce Fields0a68b0b2010-05-26 08:42:24 -04002948 ret = ERR_PTR(-EAFNOSUPPORT);
2949 goto out_err;
Alexandros Batsakisf300bab2009-09-10 17:33:30 +03002950 }
2951
Pavel Emelyanov50fa0d42010-10-05 20:49:35 +04002952 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2953 xprt->address_strings[RPC_DISPLAY_ADDR],
2954 xprt->address_strings[RPC_DISPLAY_PORT],
2955 xprt->address_strings[RPC_DISPLAY_PROTO]);
Alexandros Batsakisf300bab2009-09-10 17:33:30 +03002956
2957 /*
J. Bruce Fields99de8ea2010-12-08 12:45:44 -05002958 * Once we've associated a backchannel xprt with a connection,
Weng Meiling28303ca2013-11-30 17:56:44 +08002959 * we want to keep it around as long as the connection lasts,
2960 * in case we need to start using it for a backchannel again;
2961 * this reference won't be dropped until bc_xprt is destroyed.
J. Bruce Fields99de8ea2010-12-08 12:45:44 -05002962 */
2963 xprt_get(xprt);
2964 args->bc_xprt->xpt_bc_xprt = xprt;
2965 xprt->bc_xprt = args->bc_xprt;
2966 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
2967 transport->sock = bc_sock->sk_sock;
2968 transport->inet = bc_sock->sk_sk;
2969
2970 /*
Alexandros Batsakisf300bab2009-09-10 17:33:30 +03002971 * Since we don't want connections for the backchannel, we set
2972 * the xprt status to connected
2973 */
2974 xprt_set_connected(xprt);
2975
2976
2977 if (try_module_get(THIS_MODULE))
2978 return xprt;
J. Bruce Fields99de8ea2010-12-08 12:45:44 -05002979 xprt_put(xprt);
J. Bruce Fields0a68b0b2010-05-26 08:42:24 -04002980 ret = ERR_PTR(-EINVAL);
2981out_err:
Pavel Emelyanove204e622010-09-29 16:03:13 +04002982 xprt_free(xprt);
J. Bruce Fields0a68b0b2010-05-26 08:42:24 -04002983 return ret;
Alexandros Batsakisf300bab2009-09-10 17:33:30 +03002984}
2985
Chuck Lever176e21e2011-05-09 15:22:44 -04002986static struct xprt_class xs_local_transport = {
2987 .list = LIST_HEAD_INIT(xs_local_transport.list),
2988 .name = "named UNIX socket",
2989 .owner = THIS_MODULE,
2990 .ident = XPRT_TRANSPORT_LOCAL,
2991 .setup = xs_setup_local,
2992};
2993
\"Talpey, Thomas\bc255712007-09-10 13:46:39 -04002994static struct xprt_class xs_udp_transport = {
2995 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2996 .name = "udp",
2997 .owner = THIS_MODULE,
Alexandros Batsakisf300bab2009-09-10 17:33:30 +03002998 .ident = XPRT_TRANSPORT_UDP,
\"Talpey, Thomas\bc255712007-09-10 13:46:39 -04002999 .setup = xs_setup_udp,
3000};
3001
3002static struct xprt_class xs_tcp_transport = {
3003 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
3004 .name = "tcp",
3005 .owner = THIS_MODULE,
Alexandros Batsakisf300bab2009-09-10 17:33:30 +03003006 .ident = XPRT_TRANSPORT_TCP,
\"Talpey, Thomas\bc255712007-09-10 13:46:39 -04003007 .setup = xs_setup_tcp,
3008};
3009
Alexandros Batsakisf300bab2009-09-10 17:33:30 +03003010static struct xprt_class xs_bc_tcp_transport = {
3011 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
3012 .name = "tcp NFSv4.1 backchannel",
3013 .owner = THIS_MODULE,
3014 .ident = XPRT_TRANSPORT_BC_TCP,
3015 .setup = xs_setup_bc_tcp,
3016};
3017
Chuck Lever282b32e2006-12-05 16:35:51 -05003018/**
\"Talpey, Thomas\bc255712007-09-10 13:46:39 -04003019 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
Chuck Lever282b32e2006-12-05 16:35:51 -05003020 *
3021 */
3022int init_socket_xprt(void)
3023{
Chuck Leverfbf76682006-12-05 16:35:54 -05003024#ifdef RPC_DEBUG
Eric W. Biederman2b1bec52007-02-14 00:33:24 -08003025 if (!sunrpc_table_header)
Eric W. Biederman0b4d4142007-02-14 00:34:09 -08003026 sunrpc_table_header = register_sysctl_table(sunrpc_table);
Chuck Leverfbf76682006-12-05 16:35:54 -05003027#endif
3028
Chuck Lever176e21e2011-05-09 15:22:44 -04003029 xprt_register_transport(&xs_local_transport);
\"Talpey, Thomas\bc255712007-09-10 13:46:39 -04003030 xprt_register_transport(&xs_udp_transport);
3031 xprt_register_transport(&xs_tcp_transport);
Alexandros Batsakisf300bab2009-09-10 17:33:30 +03003032 xprt_register_transport(&xs_bc_tcp_transport);
\"Talpey, Thomas\bc255712007-09-10 13:46:39 -04003033
Chuck Lever282b32e2006-12-05 16:35:51 -05003034 return 0;
3035}
3036
3037/**
\"Talpey, Thomas\bc255712007-09-10 13:46:39 -04003038 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
Chuck Lever282b32e2006-12-05 16:35:51 -05003039 *
3040 */
3041void cleanup_socket_xprt(void)
3042{
Chuck Leverfbf76682006-12-05 16:35:54 -05003043#ifdef RPC_DEBUG
3044 if (sunrpc_table_header) {
3045 unregister_sysctl_table(sunrpc_table_header);
3046 sunrpc_table_header = NULL;
3047 }
3048#endif
\"Talpey, Thomas\bc255712007-09-10 13:46:39 -04003049
Chuck Lever176e21e2011-05-09 15:22:44 -04003050 xprt_unregister_transport(&xs_local_transport);
\"Talpey, Thomas\bc255712007-09-10 13:46:39 -04003051 xprt_unregister_transport(&xs_udp_transport);
3052 xprt_unregister_transport(&xs_tcp_transport);
Alexandros Batsakisf300bab2009-09-10 17:33:30 +03003053 xprt_unregister_transport(&xs_bc_tcp_transport);
Chuck Lever282b32e2006-12-05 16:35:51 -05003054}
Trond Myklebustcbf11072009-08-09 15:06:19 -04003055
Rusty Russell9bbb9e52010-08-11 23:04:12 -06003056static int param_set_uint_minmax(const char *val,
3057 const struct kernel_param *kp,
Trond Myklebustcbf11072009-08-09 15:06:19 -04003058 unsigned int min, unsigned int max)
3059{
3060 unsigned long num;
3061 int ret;
3062
3063 if (!val)
3064 return -EINVAL;
3065 ret = strict_strtoul(val, 0, &num);
3066 if (ret == -EINVAL || num < min || num > max)
3067 return -EINVAL;
3068 *((unsigned int *)kp->arg) = num;
3069 return 0;
3070}
3071
Rusty Russell9bbb9e52010-08-11 23:04:12 -06003072static int param_set_portnr(const char *val, const struct kernel_param *kp)
Trond Myklebustcbf11072009-08-09 15:06:19 -04003073{
3074 return param_set_uint_minmax(val, kp,
3075 RPC_MIN_RESVPORT,
3076 RPC_MAX_RESVPORT);
3077}
3078
Rusty Russell9bbb9e52010-08-11 23:04:12 -06003079static struct kernel_param_ops param_ops_portnr = {
3080 .set = param_set_portnr,
3081 .get = param_get_uint,
3082};
3083
Trond Myklebustcbf11072009-08-09 15:06:19 -04003084#define param_check_portnr(name, p) \
3085 __param_check(name, p, unsigned int);
3086
3087module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3088module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3089
Rusty Russell9bbb9e52010-08-11 23:04:12 -06003090static int param_set_slot_table_size(const char *val,
3091 const struct kernel_param *kp)
Trond Myklebustcbf11072009-08-09 15:06:19 -04003092{
3093 return param_set_uint_minmax(val, kp,
3094 RPC_MIN_SLOT_TABLE,
3095 RPC_MAX_SLOT_TABLE);
3096}
3097
Rusty Russell9bbb9e52010-08-11 23:04:12 -06003098static struct kernel_param_ops param_ops_slot_table_size = {
3099 .set = param_set_slot_table_size,
3100 .get = param_get_uint,
3101};
3102
Trond Myklebustcbf11072009-08-09 15:06:19 -04003103#define param_check_slot_table_size(name, p) \
3104 __param_check(name, p, unsigned int);
3105
Trond Myklebustd9ba1312011-07-17 18:11:30 -04003106static int param_set_max_slot_table_size(const char *val,
3107 const struct kernel_param *kp)
3108{
3109 return param_set_uint_minmax(val, kp,
3110 RPC_MIN_SLOT_TABLE,
3111 RPC_MAX_SLOT_TABLE_LIMIT);
3112}
3113
3114static struct kernel_param_ops param_ops_max_slot_table_size = {
3115 .set = param_set_max_slot_table_size,
3116 .get = param_get_uint,
3117};
3118
3119#define param_check_max_slot_table_size(name, p) \
3120 __param_check(name, p, unsigned int);
3121
Trond Myklebustcbf11072009-08-09 15:06:19 -04003122module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3123 slot_table_size, 0644);
Trond Myklebustd9ba1312011-07-17 18:11:30 -04003124module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3125 max_slot_table_size, 0644);
Trond Myklebustcbf11072009-08-09 15:06:19 -04003126module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3127 slot_table_size, 0644);
3128