| /* |
| * linux/net/sunrpc/svcsock.c |
| * |
| * These are the RPC server socket internals. |
| * |
| * The server scheduling algorithm does not always distribute the load |
| * evenly when servicing a single client. May need to modify the |
| * svc_xprt_enqueue procedure... |
| * |
| * TCP support is largely untested and may be a little slow. The problem |
| * is that we currently do two separate recvfrom's, one for the 4-byte |
| * record length, and the second for the actual record. This could possibly |
| * be improved by always reading a minimum size of around 100 bytes and |
| * tucking any superfluous bytes away in a temporary store. Still, that |
| * leaves write requests out in the rain. An alternative may be to peek at |
| * the first skb in the queue, and if it matches the next TCP sequence |
| * number, to extract the record marker. Yuck. |
| * |
| * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/sched.h> |
| #include <linux/module.h> |
| #include <linux/errno.h> |
| #include <linux/fcntl.h> |
| #include <linux/net.h> |
| #include <linux/in.h> |
| #include <linux/inet.h> |
| #include <linux/udp.h> |
| #include <linux/tcp.h> |
| #include <linux/unistd.h> |
| #include <linux/slab.h> |
| #include <linux/netdevice.h> |
| #include <linux/skbuff.h> |
| #include <linux/file.h> |
| #include <linux/freezer.h> |
| #include <net/sock.h> |
| #include <net/checksum.h> |
| #include <net/ip.h> |
| #include <net/ipv6.h> |
| #include <net/udp.h> |
| #include <net/tcp.h> |
| #include <net/tcp_states.h> |
| #include <linux/uaccess.h> |
| #include <asm/ioctls.h> |
| #include <trace/events/skb.h> |
| |
| #include <linux/sunrpc/types.h> |
| #include <linux/sunrpc/clnt.h> |
| #include <linux/sunrpc/xdr.h> |
| #include <linux/sunrpc/msg_prot.h> |
| #include <linux/sunrpc/svcsock.h> |
| #include <linux/sunrpc/stats.h> |
| #include <linux/sunrpc/xprt.h> |
| |
| #include "sunrpc.h" |
| |
| #define RPCDBG_FACILITY RPCDBG_SVCXPRT |
| |
| |
| static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *, |
| int flags); |
| static int svc_udp_recvfrom(struct svc_rqst *); |
| static int svc_udp_sendto(struct svc_rqst *); |
| static void svc_sock_detach(struct svc_xprt *); |
| static void svc_tcp_sock_detach(struct svc_xprt *); |
| static void svc_sock_free(struct svc_xprt *); |
| |
| static struct svc_xprt *svc_create_socket(struct svc_serv *, int, |
| struct net *, struct sockaddr *, |
| int, int); |
| #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
| static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int, |
| struct net *, struct sockaddr *, |
| int, int); |
| static void svc_bc_sock_free(struct svc_xprt *xprt); |
| #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
| |
| #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| static struct lock_class_key svc_key[2]; |
| static struct lock_class_key svc_slock_key[2]; |
| |
| static void svc_reclassify_socket(struct socket *sock) |
| { |
| struct sock *sk = sock->sk; |
| |
| if (WARN_ON_ONCE(!sock_allow_reclassification(sk))) |
| return; |
| |
| switch (sk->sk_family) { |
| case AF_INET: |
| sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD", |
| &svc_slock_key[0], |
| "sk_xprt.xpt_lock-AF_INET-NFSD", |
| &svc_key[0]); |
| break; |
| |
| case AF_INET6: |
| sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD", |
| &svc_slock_key[1], |
| "sk_xprt.xpt_lock-AF_INET6-NFSD", |
| &svc_key[1]); |
| break; |
| |
| default: |
| BUG(); |
| } |
| } |
| #else |
| static void svc_reclassify_socket(struct socket *sock) |
| { |
| } |
| #endif |
| |
| /* |
| * Release an skbuff after use |
| */ |
| static void svc_release_skb(struct svc_rqst *rqstp) |
| { |
| struct sk_buff *skb = rqstp->rq_xprt_ctxt; |
| |
| if (skb) { |
| struct svc_sock *svsk = |
| container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); |
| rqstp->rq_xprt_ctxt = NULL; |
| |
| dprintk("svc: service %p, releasing skb %p\n", rqstp, skb); |
| skb_free_datagram_locked(svsk->sk_sk, skb); |
| } |
| } |
| |
| static void svc_release_udp_skb(struct svc_rqst *rqstp) |
| { |
| struct sk_buff *skb = rqstp->rq_xprt_ctxt; |
| |
| if (skb) { |
| rqstp->rq_xprt_ctxt = NULL; |
| |
| dprintk("svc: service %p, releasing skb %p\n", rqstp, skb); |
| consume_skb(skb); |
| } |
| } |
| |
| union svc_pktinfo_u { |
| struct in_pktinfo pkti; |
| struct in6_pktinfo pkti6; |
| }; |
| #define SVC_PKTINFO_SPACE \ |
| CMSG_SPACE(sizeof(union svc_pktinfo_u)) |
| |
| static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh) |
| { |
| struct svc_sock *svsk = |
| container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); |
| switch (svsk->sk_sk->sk_family) { |
| case AF_INET: { |
| struct in_pktinfo *pki = CMSG_DATA(cmh); |
| |
| cmh->cmsg_level = SOL_IP; |
| cmh->cmsg_type = IP_PKTINFO; |
| pki->ipi_ifindex = 0; |
| pki->ipi_spec_dst.s_addr = |
| svc_daddr_in(rqstp)->sin_addr.s_addr; |
| cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); |
| } |
| break; |
| |
| case AF_INET6: { |
| struct in6_pktinfo *pki = CMSG_DATA(cmh); |
| struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp); |
| |
| cmh->cmsg_level = SOL_IPV6; |
| cmh->cmsg_type = IPV6_PKTINFO; |
| pki->ipi6_ifindex = daddr->sin6_scope_id; |
| pki->ipi6_addr = daddr->sin6_addr; |
| cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); |
| } |
| break; |
| } |
| } |
| |
| /* |
| * send routine intended to be shared by the fore- and back-channel |
| */ |
| int svc_send_common(struct socket *sock, struct xdr_buf *xdr, |
| struct page *headpage, unsigned long headoffset, |
| struct page *tailpage, unsigned long tailoffset) |
| { |
| int result; |
| int size; |
| struct page **ppage = xdr->pages; |
| size_t base = xdr->page_base; |
| unsigned int pglen = xdr->page_len; |
| unsigned int flags = MSG_MORE | MSG_SENDPAGE_NOTLAST; |
| int slen; |
| int len = 0; |
| |
| slen = xdr->len; |
| |
| /* send head */ |
| if (slen == xdr->head[0].iov_len) |
| flags = 0; |
| len = kernel_sendpage(sock, headpage, headoffset, |
| xdr->head[0].iov_len, flags); |
| if (len != xdr->head[0].iov_len) |
| goto out; |
| slen -= xdr->head[0].iov_len; |
| if (slen == 0) |
| goto out; |
| |
| /* send page data */ |
| size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen; |
| while (pglen > 0) { |
| if (slen == size) |
| flags = 0; |
| result = kernel_sendpage(sock, *ppage, base, size, flags); |
| if (result > 0) |
| len += result; |
| if (result != size) |
| goto out; |
| slen -= size; |
| pglen -= size; |
| size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen; |
| base = 0; |
| ppage++; |
| } |
| |
| /* send tail */ |
| if (xdr->tail[0].iov_len) { |
| result = kernel_sendpage(sock, tailpage, tailoffset, |
| xdr->tail[0].iov_len, 0); |
| if (result > 0) |
| len += result; |
| } |
| |
| out: |
| return len; |
| } |
| |
| |
| /* |
| * Generic sendto routine |
| */ |
| static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr) |
| { |
| struct svc_sock *svsk = |
| container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); |
| struct socket *sock = svsk->sk_sock; |
| union { |
| struct cmsghdr hdr; |
| long all[SVC_PKTINFO_SPACE / sizeof(long)]; |
| } buffer; |
| struct cmsghdr *cmh = &buffer.hdr; |
| int len = 0; |
| unsigned long tailoff; |
| unsigned long headoff; |
| RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
| |
| if (rqstp->rq_prot == IPPROTO_UDP) { |
| struct msghdr msg = { |
| .msg_name = &rqstp->rq_addr, |
| .msg_namelen = rqstp->rq_addrlen, |
| .msg_control = cmh, |
| .msg_controllen = sizeof(buffer), |
| .msg_flags = MSG_MORE, |
| }; |
| |
| svc_set_cmsg_data(rqstp, cmh); |
| |
| if (sock_sendmsg(sock, &msg) < 0) |
| goto out; |
| } |
| |
| tailoff = ((unsigned long)xdr->tail[0].iov_base) & (PAGE_SIZE-1); |
| headoff = 0; |
| len = svc_send_common(sock, xdr, rqstp->rq_respages[0], headoff, |
| rqstp->rq_respages[0], tailoff); |
| |
| out: |
| dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n", |
| svsk, xdr->head[0].iov_base, xdr->head[0].iov_len, |
| xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf))); |
| |
| return len; |
| } |
| |
| /* |
| * Report socket names for nfsdfs |
| */ |
| static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining) |
| { |
| const struct sock *sk = svsk->sk_sk; |
| const char *proto_name = sk->sk_protocol == IPPROTO_UDP ? |
| "udp" : "tcp"; |
| int len; |
| |
| switch (sk->sk_family) { |
| case PF_INET: |
| len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n", |
| proto_name, |
| &inet_sk(sk)->inet_rcv_saddr, |
| inet_sk(sk)->inet_num); |
| break; |
| #if IS_ENABLED(CONFIG_IPV6) |
| case PF_INET6: |
| len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n", |
| proto_name, |
| &sk->sk_v6_rcv_saddr, |
| inet_sk(sk)->inet_num); |
| break; |
| #endif |
| default: |
| len = snprintf(buf, remaining, "*unknown-%d*\n", |
| sk->sk_family); |
| } |
| |
| if (len >= remaining) { |
| *buf = '\0'; |
| return -ENAMETOOLONG; |
| } |
| return len; |
| } |
| |
| /* |
| * Generic recvfrom routine. |
| */ |
| static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr, |
| int buflen) |
| { |
| struct svc_sock *svsk = |
| container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); |
| struct msghdr msg = { |
| .msg_flags = MSG_DONTWAIT, |
| }; |
| int len; |
| |
| rqstp->rq_xprt_hlen = 0; |
| |
| clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
| len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen, |
| msg.msg_flags); |
| /* If we read a full record, then assume there may be more |
| * data to read (stream based sockets only!) |
| */ |
| if (len == buflen) |
| set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
| |
| dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n", |
| svsk, iov[0].iov_base, iov[0].iov_len, len); |
| return len; |
| } |
| |
| static int svc_partial_recvfrom(struct svc_rqst *rqstp, |
| struct kvec *iov, int nr, |
| int buflen, unsigned int base) |
| { |
| size_t save_iovlen; |
| void *save_iovbase; |
| unsigned int i; |
| int ret; |
| |
| if (base == 0) |
| return svc_recvfrom(rqstp, iov, nr, buflen); |
| |
| for (i = 0; i < nr; i++) { |
| if (iov[i].iov_len > base) |
| break; |
| base -= iov[i].iov_len; |
| } |
| save_iovlen = iov[i].iov_len; |
| save_iovbase = iov[i].iov_base; |
| iov[i].iov_len -= base; |
| iov[i].iov_base += base; |
| ret = svc_recvfrom(rqstp, &iov[i], nr - i, buflen); |
| iov[i].iov_len = save_iovlen; |
| iov[i].iov_base = save_iovbase; |
| return ret; |
| } |
| |
| /* |
| * Set socket snd and rcv buffer lengths |
| */ |
| static void svc_sock_setbufsize(struct socket *sock, unsigned int snd, |
| unsigned int rcv) |
| { |
| #if 0 |
| mm_segment_t oldfs; |
| oldfs = get_fs(); set_fs(KERNEL_DS); |
| sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF, |
| (char*)&snd, sizeof(snd)); |
| sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF, |
| (char*)&rcv, sizeof(rcv)); |
| #else |
| /* sock_setsockopt limits use to sysctl_?mem_max, |
| * which isn't acceptable. Until that is made conditional |
| * on not having CAP_SYS_RESOURCE or similar, we go direct... |
| * DaveM said I could! |
| */ |
| lock_sock(sock->sk); |
| sock->sk->sk_sndbuf = snd * 2; |
| sock->sk->sk_rcvbuf = rcv * 2; |
| sock->sk->sk_write_space(sock->sk); |
| release_sock(sock->sk); |
| #endif |
| } |
| |
| static int svc_sock_secure_port(struct svc_rqst *rqstp) |
| { |
| return svc_port_is_privileged(svc_addr(rqstp)); |
| } |
| |
| /* |
| * INET callback when data has been received on the socket. |
| */ |
| static void svc_data_ready(struct sock *sk) |
| { |
| struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
| |
| if (svsk) { |
| dprintk("svc: socket %p(inet %p), busy=%d\n", |
| svsk, sk, |
| test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); |
| svsk->sk_odata(sk); |
| if (!test_and_set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags)) |
| svc_xprt_enqueue(&svsk->sk_xprt); |
| } |
| } |
| |
| /* |
| * INET callback when space is newly available on the socket. |
| */ |
| static void svc_write_space(struct sock *sk) |
| { |
| struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data); |
| |
| if (svsk) { |
| dprintk("svc: socket %p(inet %p), write_space busy=%d\n", |
| svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); |
| svsk->sk_owspace(sk); |
| svc_xprt_enqueue(&svsk->sk_xprt); |
| } |
| } |
| |
| static int svc_tcp_has_wspace(struct svc_xprt *xprt) |
| { |
| struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
| |
| if (test_bit(XPT_LISTENER, &xprt->xpt_flags)) |
| return 1; |
| return !test_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); |
| } |
| |
| static void svc_tcp_kill_temp_xprt(struct svc_xprt *xprt) |
| { |
| struct svc_sock *svsk; |
| struct socket *sock; |
| struct linger no_linger = { |
| .l_onoff = 1, |
| .l_linger = 0, |
| }; |
| |
| svsk = container_of(xprt, struct svc_sock, sk_xprt); |
| sock = svsk->sk_sock; |
| kernel_setsockopt(sock, SOL_SOCKET, SO_LINGER, |
| (char *)&no_linger, sizeof(no_linger)); |
| } |
| |
| /* |
| * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo |
| */ |
| static int svc_udp_get_dest_address4(struct svc_rqst *rqstp, |
| struct cmsghdr *cmh) |
| { |
| struct in_pktinfo *pki = CMSG_DATA(cmh); |
| struct sockaddr_in *daddr = svc_daddr_in(rqstp); |
| |
| if (cmh->cmsg_type != IP_PKTINFO) |
| return 0; |
| |
| daddr->sin_family = AF_INET; |
| daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr; |
| return 1; |
| } |
| |
| /* |
| * See net/ipv6/datagram.c : ip6_datagram_recv_ctl |
| */ |
| static int svc_udp_get_dest_address6(struct svc_rqst *rqstp, |
| struct cmsghdr *cmh) |
| { |
| struct in6_pktinfo *pki = CMSG_DATA(cmh); |
| struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp); |
| |
| if (cmh->cmsg_type != IPV6_PKTINFO) |
| return 0; |
| |
| daddr->sin6_family = AF_INET6; |
| daddr->sin6_addr = pki->ipi6_addr; |
| daddr->sin6_scope_id = pki->ipi6_ifindex; |
| return 1; |
| } |
| |
| /* |
| * Copy the UDP datagram's destination address to the rqstp structure. |
| * The 'destination' address in this case is the address to which the |
| * peer sent the datagram, i.e. our local address. For multihomed |
| * hosts, this can change from msg to msg. Note that only the IP |
| * address changes, the port number should remain the same. |
| */ |
| static int svc_udp_get_dest_address(struct svc_rqst *rqstp, |
| struct cmsghdr *cmh) |
| { |
| switch (cmh->cmsg_level) { |
| case SOL_IP: |
| return svc_udp_get_dest_address4(rqstp, cmh); |
| case SOL_IPV6: |
| return svc_udp_get_dest_address6(rqstp, cmh); |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Receive a datagram from a UDP socket. |
| */ |
| static int svc_udp_recvfrom(struct svc_rqst *rqstp) |
| { |
| struct svc_sock *svsk = |
| container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); |
| struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
| struct sk_buff *skb; |
| union { |
| struct cmsghdr hdr; |
| long all[SVC_PKTINFO_SPACE / sizeof(long)]; |
| } buffer; |
| struct cmsghdr *cmh = &buffer.hdr; |
| struct msghdr msg = { |
| .msg_name = svc_addr(rqstp), |
| .msg_control = cmh, |
| .msg_controllen = sizeof(buffer), |
| .msg_flags = MSG_DONTWAIT, |
| }; |
| size_t len; |
| int err; |
| |
| if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags)) |
| /* udp sockets need large rcvbuf as all pending |
| * requests are still in that buffer. sndbuf must |
| * also be large enough that there is enough space |
| * for one reply per thread. We count all threads |
| * rather than threads in a particular pool, which |
| * provides an upper bound on the number of threads |
| * which will access the socket. |
| */ |
| svc_sock_setbufsize(svsk->sk_sock, |
| (serv->sv_nrthreads+3) * serv->sv_max_mesg, |
| (serv->sv_nrthreads+3) * serv->sv_max_mesg); |
| |
| clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
| skb = NULL; |
| err = kernel_recvmsg(svsk->sk_sock, &msg, NULL, |
| 0, 0, MSG_PEEK | MSG_DONTWAIT); |
| if (err >= 0) |
| skb = skb_recv_udp(svsk->sk_sk, 0, 1, &err); |
| |
| if (skb == NULL) { |
| if (err != -EAGAIN) { |
| /* possibly an icmp error */ |
| dprintk("svc: recvfrom returned error %d\n", -err); |
| set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
| } |
| return 0; |
| } |
| len = svc_addr_len(svc_addr(rqstp)); |
| rqstp->rq_addrlen = len; |
| if (skb->tstamp == 0) { |
| skb->tstamp = ktime_get_real(); |
| /* Don't enable netstamp, sunrpc doesn't |
| need that much accuracy */ |
| } |
| svsk->sk_sk->sk_stamp = skb->tstamp; |
| set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */ |
| |
| len = skb->len; |
| rqstp->rq_arg.len = len; |
| |
| rqstp->rq_prot = IPPROTO_UDP; |
| |
| if (!svc_udp_get_dest_address(rqstp, cmh)) { |
| net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n", |
| cmh->cmsg_level, cmh->cmsg_type); |
| goto out_free; |
| } |
| rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp)); |
| |
| if (skb_is_nonlinear(skb)) { |
| /* we have to copy */ |
| local_bh_disable(); |
| if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) { |
| local_bh_enable(); |
| /* checksum error */ |
| goto out_free; |
| } |
| local_bh_enable(); |
| consume_skb(skb); |
| } else { |
| /* we can use it in-place */ |
| rqstp->rq_arg.head[0].iov_base = skb->data; |
| rqstp->rq_arg.head[0].iov_len = len; |
| if (skb_checksum_complete(skb)) |
| goto out_free; |
| rqstp->rq_xprt_ctxt = skb; |
| } |
| |
| rqstp->rq_arg.page_base = 0; |
| if (len <= rqstp->rq_arg.head[0].iov_len) { |
| rqstp->rq_arg.head[0].iov_len = len; |
| rqstp->rq_arg.page_len = 0; |
| rqstp->rq_respages = rqstp->rq_pages+1; |
| } else { |
| rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len; |
| rqstp->rq_respages = rqstp->rq_pages + 1 + |
| DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE); |
| } |
| rqstp->rq_next_page = rqstp->rq_respages+1; |
| |
| if (serv->sv_stats) |
| serv->sv_stats->netudpcnt++; |
| |
| return len; |
| out_free: |
| kfree_skb(skb); |
| return 0; |
| } |
| |
| static int |
| svc_udp_sendto(struct svc_rqst *rqstp) |
| { |
| int error; |
| |
| error = svc_sendto(rqstp, &rqstp->rq_res); |
| if (error == -ECONNREFUSED) |
| /* ICMP error on earlier request. */ |
| error = svc_sendto(rqstp, &rqstp->rq_res); |
| |
| return error; |
| } |
| |
| static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp) |
| { |
| } |
| |
| static int svc_udp_has_wspace(struct svc_xprt *xprt) |
| { |
| struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
| struct svc_serv *serv = xprt->xpt_server; |
| unsigned long required; |
| |
| /* |
| * Set the SOCK_NOSPACE flag before checking the available |
| * sock space. |
| */ |
| set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); |
| required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg; |
| if (required*2 > sock_wspace(svsk->sk_sk)) |
| return 0; |
| clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); |
| return 1; |
| } |
| |
| static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt) |
| { |
| BUG(); |
| return NULL; |
| } |
| |
| static void svc_udp_kill_temp_xprt(struct svc_xprt *xprt) |
| { |
| } |
| |
| static struct svc_xprt *svc_udp_create(struct svc_serv *serv, |
| struct net *net, |
| struct sockaddr *sa, int salen, |
| int flags) |
| { |
| return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags); |
| } |
| |
| static struct svc_xprt_ops svc_udp_ops = { |
| .xpo_create = svc_udp_create, |
| .xpo_recvfrom = svc_udp_recvfrom, |
| .xpo_sendto = svc_udp_sendto, |
| .xpo_release_rqst = svc_release_udp_skb, |
| .xpo_detach = svc_sock_detach, |
| .xpo_free = svc_sock_free, |
| .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr, |
| .xpo_has_wspace = svc_udp_has_wspace, |
| .xpo_accept = svc_udp_accept, |
| .xpo_secure_port = svc_sock_secure_port, |
| .xpo_kill_temp_xprt = svc_udp_kill_temp_xprt, |
| }; |
| |
| static struct svc_xprt_class svc_udp_class = { |
| .xcl_name = "udp", |
| .xcl_owner = THIS_MODULE, |
| .xcl_ops = &svc_udp_ops, |
| .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP, |
| .xcl_ident = XPRT_TRANSPORT_UDP, |
| }; |
| |
| static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv) |
| { |
| int err, level, optname, one = 1; |
| |
| svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class, |
| &svsk->sk_xprt, serv); |
| clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
| svsk->sk_sk->sk_data_ready = svc_data_ready; |
| svsk->sk_sk->sk_write_space = svc_write_space; |
| |
| /* initialise setting must have enough space to |
| * receive and respond to one request. |
| * svc_udp_recvfrom will re-adjust if necessary |
| */ |
| svc_sock_setbufsize(svsk->sk_sock, |
| 3 * svsk->sk_xprt.xpt_server->sv_max_mesg, |
| 3 * svsk->sk_xprt.xpt_server->sv_max_mesg); |
| |
| /* data might have come in before data_ready set up */ |
| set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
| set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
| |
| /* make sure we get destination address info */ |
| switch (svsk->sk_sk->sk_family) { |
| case AF_INET: |
| level = SOL_IP; |
| optname = IP_PKTINFO; |
| break; |
| case AF_INET6: |
| level = SOL_IPV6; |
| optname = IPV6_RECVPKTINFO; |
| break; |
| default: |
| BUG(); |
| } |
| err = kernel_setsockopt(svsk->sk_sock, level, optname, |
| (char *)&one, sizeof(one)); |
| dprintk("svc: kernel_setsockopt returned %d\n", err); |
| } |
| |
| /* |
| * A data_ready event on a listening socket means there's a connection |
| * pending. Do not use state_change as a substitute for it. |
| */ |
| static void svc_tcp_listen_data_ready(struct sock *sk) |
| { |
| struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
| |
| dprintk("svc: socket %p TCP (listen) state change %d\n", |
| sk, sk->sk_state); |
| |
| if (svsk) |
| svsk->sk_odata(sk); |
| /* |
| * This callback may called twice when a new connection |
| * is established as a child socket inherits everything |
| * from a parent LISTEN socket. |
| * 1) data_ready method of the parent socket will be called |
| * when one of child sockets become ESTABLISHED. |
| * 2) data_ready method of the child socket may be called |
| * when it receives data before the socket is accepted. |
| * In case of 2, we should ignore it silently. |
| */ |
| if (sk->sk_state == TCP_LISTEN) { |
| if (svsk) { |
| set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
| svc_xprt_enqueue(&svsk->sk_xprt); |
| } else |
| printk("svc: socket %p: no user data\n", sk); |
| } |
| } |
| |
| /* |
| * A state change on a connected socket means it's dying or dead. |
| */ |
| static void svc_tcp_state_change(struct sock *sk) |
| { |
| struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
| |
| dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n", |
| sk, sk->sk_state, sk->sk_user_data); |
| |
| if (!svsk) |
| printk("svc: socket %p: no user data\n", sk); |
| else { |
| svsk->sk_ostate(sk); |
| if (sk->sk_state != TCP_ESTABLISHED) { |
| set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
| svc_xprt_enqueue(&svsk->sk_xprt); |
| } |
| } |
| } |
| |
| /* |
| * Accept a TCP connection |
| */ |
| static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt) |
| { |
| struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
| struct sockaddr_storage addr; |
| struct sockaddr *sin = (struct sockaddr *) &addr; |
| struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
| struct socket *sock = svsk->sk_sock; |
| struct socket *newsock; |
| struct svc_sock *newsvsk; |
| int err, slen; |
| RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
| |
| dprintk("svc: tcp_accept %p sock %p\n", svsk, sock); |
| if (!sock) |
| return NULL; |
| |
| clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
| err = kernel_accept(sock, &newsock, O_NONBLOCK); |
| if (err < 0) { |
| if (err == -ENOMEM) |
| printk(KERN_WARNING "%s: no more sockets!\n", |
| serv->sv_name); |
| else if (err != -EAGAIN) |
| net_warn_ratelimited("%s: accept failed (err %d)!\n", |
| serv->sv_name, -err); |
| return NULL; |
| } |
| set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
| |
| err = kernel_getpeername(newsock, sin, &slen); |
| if (err < 0) { |
| net_warn_ratelimited("%s: peername failed (err %d)!\n", |
| serv->sv_name, -err); |
| goto failed; /* aborted connection or whatever */ |
| } |
| |
| /* Ideally, we would want to reject connections from unauthorized |
| * hosts here, but when we get encryption, the IP of the host won't |
| * tell us anything. For now just warn about unpriv connections. |
| */ |
| if (!svc_port_is_privileged(sin)) { |
| dprintk("%s: connect from unprivileged port: %s\n", |
| serv->sv_name, |
| __svc_print_addr(sin, buf, sizeof(buf))); |
| } |
| dprintk("%s: connect from %s\n", serv->sv_name, |
| __svc_print_addr(sin, buf, sizeof(buf))); |
| |
| /* Reset the inherited callbacks before calling svc_setup_socket */ |
| newsock->sk->sk_state_change = svsk->sk_ostate; |
| newsock->sk->sk_data_ready = svsk->sk_odata; |
| newsock->sk->sk_write_space = svsk->sk_owspace; |
| |
| /* make sure that a write doesn't block forever when |
| * low on memory |
| */ |
| newsock->sk->sk_sndtimeo = HZ*30; |
| |
| newsvsk = svc_setup_socket(serv, newsock, |
| (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY)); |
| if (IS_ERR(newsvsk)) |
| goto failed; |
| svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen); |
| err = kernel_getsockname(newsock, sin, &slen); |
| if (unlikely(err < 0)) { |
| dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err); |
| slen = offsetof(struct sockaddr, sa_data); |
| } |
| svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen); |
| |
| if (sock_is_loopback(newsock->sk)) |
| set_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags); |
| else |
| clear_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags); |
| if (serv->sv_stats) |
| serv->sv_stats->nettcpconn++; |
| |
| return &newsvsk->sk_xprt; |
| |
| failed: |
| sock_release(newsock); |
| return NULL; |
| } |
| |
| static unsigned int svc_tcp_restore_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) |
| { |
| unsigned int i, len, npages; |
| |
| if (svsk->sk_datalen == 0) |
| return 0; |
| len = svsk->sk_datalen; |
| npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
| for (i = 0; i < npages; i++) { |
| if (rqstp->rq_pages[i] != NULL) |
| put_page(rqstp->rq_pages[i]); |
| BUG_ON(svsk->sk_pages[i] == NULL); |
| rqstp->rq_pages[i] = svsk->sk_pages[i]; |
| svsk->sk_pages[i] = NULL; |
| } |
| rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]); |
| return len; |
| } |
| |
| static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) |
| { |
| unsigned int i, len, npages; |
| |
| if (svsk->sk_datalen == 0) |
| return; |
| len = svsk->sk_datalen; |
| npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
| for (i = 0; i < npages; i++) { |
| svsk->sk_pages[i] = rqstp->rq_pages[i]; |
| rqstp->rq_pages[i] = NULL; |
| } |
| } |
| |
| static void svc_tcp_clear_pages(struct svc_sock *svsk) |
| { |
| unsigned int i, len, npages; |
| |
| if (svsk->sk_datalen == 0) |
| goto out; |
| len = svsk->sk_datalen; |
| npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
| for (i = 0; i < npages; i++) { |
| if (svsk->sk_pages[i] == NULL) { |
| WARN_ON_ONCE(1); |
| continue; |
| } |
| put_page(svsk->sk_pages[i]); |
| svsk->sk_pages[i] = NULL; |
| } |
| out: |
| svsk->sk_tcplen = 0; |
| svsk->sk_datalen = 0; |
| } |
| |
| /* |
| * Receive fragment record header. |
| * If we haven't gotten the record length yet, get the next four bytes. |
| */ |
| static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp) |
| { |
| struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
| unsigned int want; |
| int len; |
| |
| if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) { |
| struct kvec iov; |
| |
| want = sizeof(rpc_fraghdr) - svsk->sk_tcplen; |
| iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen; |
| iov.iov_len = want; |
| if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0) |
| goto error; |
| svsk->sk_tcplen += len; |
| |
| if (len < want) { |
| dprintk("svc: short recvfrom while reading record " |
| "length (%d of %d)\n", len, want); |
| return -EAGAIN; |
| } |
| |
| dprintk("svc: TCP record, %d bytes\n", svc_sock_reclen(svsk)); |
| if (svc_sock_reclen(svsk) + svsk->sk_datalen > |
| serv->sv_max_mesg) { |
| net_notice_ratelimited("RPC: fragment too large: %d\n", |
| svc_sock_reclen(svsk)); |
| goto err_delete; |
| } |
| } |
| |
| return svc_sock_reclen(svsk); |
| error: |
| dprintk("RPC: TCP recv_record got %d\n", len); |
| return len; |
| err_delete: |
| set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
| return -EAGAIN; |
| } |
| |
| static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp) |
| { |
| struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt; |
| struct rpc_rqst *req = NULL; |
| struct kvec *src, *dst; |
| __be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base; |
| __be32 xid; |
| __be32 calldir; |
| |
| xid = *p++; |
| calldir = *p; |
| |
| if (!bc_xprt) |
| return -EAGAIN; |
| spin_lock_bh(&bc_xprt->transport_lock); |
| req = xprt_lookup_rqst(bc_xprt, xid); |
| if (!req) |
| goto unlock_notfound; |
| |
| memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf)); |
| /* |
| * XXX!: cheating for now! Only copying HEAD. |
| * But we know this is good enough for now (in fact, for any |
| * callback reply in the forseeable future). |
| */ |
| dst = &req->rq_private_buf.head[0]; |
| src = &rqstp->rq_arg.head[0]; |
| if (dst->iov_len < src->iov_len) |
| goto unlock_eagain; /* whatever; just giving up. */ |
| memcpy(dst->iov_base, src->iov_base, src->iov_len); |
| xprt_complete_rqst(req->rq_task, rqstp->rq_arg.len); |
| rqstp->rq_arg.len = 0; |
| spin_unlock_bh(&bc_xprt->transport_lock); |
| return 0; |
| unlock_notfound: |
| printk(KERN_NOTICE |
| "%s: Got unrecognized reply: " |
| "calldir 0x%x xpt_bc_xprt %p xid %08x\n", |
| __func__, ntohl(calldir), |
| bc_xprt, ntohl(xid)); |
| unlock_eagain: |
| spin_unlock_bh(&bc_xprt->transport_lock); |
| return -EAGAIN; |
| } |
| |
| static int copy_pages_to_kvecs(struct kvec *vec, struct page **pages, int len) |
| { |
| int i = 0; |
| int t = 0; |
| |
| while (t < len) { |
| vec[i].iov_base = page_address(pages[i]); |
| vec[i].iov_len = PAGE_SIZE; |
| i++; |
| t += PAGE_SIZE; |
| } |
| return i; |
| } |
| |
| static void svc_tcp_fragment_received(struct svc_sock *svsk) |
| { |
| /* If we have more data, signal svc_xprt_enqueue() to try again */ |
| dprintk("svc: TCP %s record (%d bytes)\n", |
| svc_sock_final_rec(svsk) ? "final" : "nonfinal", |
| svc_sock_reclen(svsk)); |
| svsk->sk_tcplen = 0; |
| svsk->sk_reclen = 0; |
| } |
| |
| /* |
| * Receive data from a TCP socket. |
| */ |
| static int svc_tcp_recvfrom(struct svc_rqst *rqstp) |
| { |
| struct svc_sock *svsk = |
| container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); |
| struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
| int len; |
| struct kvec *vec; |
| unsigned int want, base; |
| __be32 *p; |
| __be32 calldir; |
| int pnum; |
| |
| dprintk("svc: tcp_recv %p data %d conn %d close %d\n", |
| svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags), |
| test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags), |
| test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags)); |
| |
| len = svc_tcp_recv_record(svsk, rqstp); |
| if (len < 0) |
| goto error; |
| |
| base = svc_tcp_restore_pages(svsk, rqstp); |
| want = svc_sock_reclen(svsk) - (svsk->sk_tcplen - sizeof(rpc_fraghdr)); |
| |
| vec = rqstp->rq_vec; |
| |
| pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0], |
| svsk->sk_datalen + want); |
| |
| rqstp->rq_respages = &rqstp->rq_pages[pnum]; |
| rqstp->rq_next_page = rqstp->rq_respages + 1; |
| |
| /* Now receive data */ |
| len = svc_partial_recvfrom(rqstp, vec, pnum, want, base); |
| if (len >= 0) { |
| svsk->sk_tcplen += len; |
| svsk->sk_datalen += len; |
| } |
| if (len != want || !svc_sock_final_rec(svsk)) { |
| svc_tcp_save_pages(svsk, rqstp); |
| if (len < 0 && len != -EAGAIN) |
| goto err_delete; |
| if (len == want) |
| svc_tcp_fragment_received(svsk); |
| else |
| dprintk("svc: incomplete TCP record (%d of %d)\n", |
| (int)(svsk->sk_tcplen - sizeof(rpc_fraghdr)), |
| svc_sock_reclen(svsk)); |
| goto err_noclose; |
| } |
| |
| if (svsk->sk_datalen < 8) { |
| svsk->sk_datalen = 0; |
| goto err_delete; /* client is nuts. */ |
| } |
| |
| rqstp->rq_arg.len = svsk->sk_datalen; |
| rqstp->rq_arg.page_base = 0; |
| if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) { |
| rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len; |
| rqstp->rq_arg.page_len = 0; |
| } else |
| rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len; |
| |
| rqstp->rq_xprt_ctxt = NULL; |
| rqstp->rq_prot = IPPROTO_TCP; |
| if (test_bit(XPT_LOCAL, &svsk->sk_xprt.xpt_flags)) |
| set_bit(RQ_LOCAL, &rqstp->rq_flags); |
| else |
| clear_bit(RQ_LOCAL, &rqstp->rq_flags); |
| |
| p = (__be32 *)rqstp->rq_arg.head[0].iov_base; |
| calldir = p[1]; |
| if (calldir) |
| len = receive_cb_reply(svsk, rqstp); |
| |
| /* Reset TCP read info */ |
| svsk->sk_datalen = 0; |
| svc_tcp_fragment_received(svsk); |
| |
| if (len < 0) |
| goto error; |
| |
| svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt); |
| if (serv->sv_stats) |
| serv->sv_stats->nettcpcnt++; |
| |
| return rqstp->rq_arg.len; |
| |
| error: |
| if (len != -EAGAIN) |
| goto err_delete; |
| dprintk("RPC: TCP recvfrom got EAGAIN\n"); |
| return 0; |
| err_delete: |
| printk(KERN_NOTICE "%s: recvfrom returned errno %d\n", |
| svsk->sk_xprt.xpt_server->sv_name, -len); |
| set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
| err_noclose: |
| return 0; /* record not complete */ |
| } |
| |
| /* |
| * Send out data on TCP socket. |
| */ |
| static int svc_tcp_sendto(struct svc_rqst *rqstp) |
| { |
| struct xdr_buf *xbufp = &rqstp->rq_res; |
| int sent; |
| __be32 reclen; |
| |
| /* Set up the first element of the reply kvec. |
| * Any other kvecs that may be in use have been taken |
| * care of by the server implementation itself. |
| */ |
| reclen = htonl(0x80000000|((xbufp->len ) - 4)); |
| memcpy(xbufp->head[0].iov_base, &reclen, 4); |
| |
| sent = svc_sendto(rqstp, &rqstp->rq_res); |
| if (sent != xbufp->len) { |
| printk(KERN_NOTICE |
| "rpc-srv/tcp: %s: %s %d when sending %d bytes " |
| "- shutting down socket\n", |
| rqstp->rq_xprt->xpt_server->sv_name, |
| (sent<0)?"got error":"sent only", |
| sent, xbufp->len); |
| set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags); |
| svc_xprt_enqueue(rqstp->rq_xprt); |
| sent = -EAGAIN; |
| } |
| return sent; |
| } |
| |
| /* |
| * Setup response header. TCP has a 4B record length field. |
| */ |
| static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp) |
| { |
| struct kvec *resv = &rqstp->rq_res.head[0]; |
| |
| /* tcp needs a space for the record length... */ |
| svc_putnl(resv, 0); |
| } |
| |
| static struct svc_xprt *svc_tcp_create(struct svc_serv *serv, |
| struct net *net, |
| struct sockaddr *sa, int salen, |
| int flags) |
| { |
| return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); |
| } |
| |
| #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
| static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int, |
| struct net *, struct sockaddr *, |
| int, int); |
| static void svc_bc_sock_free(struct svc_xprt *xprt); |
| |
| static struct svc_xprt *svc_bc_tcp_create(struct svc_serv *serv, |
| struct net *net, |
| struct sockaddr *sa, int salen, |
| int flags) |
| { |
| return svc_bc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); |
| } |
| |
| static void svc_bc_tcp_sock_detach(struct svc_xprt *xprt) |
| { |
| } |
| |
| static struct svc_xprt_ops svc_tcp_bc_ops = { |
| .xpo_create = svc_bc_tcp_create, |
| .xpo_detach = svc_bc_tcp_sock_detach, |
| .xpo_free = svc_bc_sock_free, |
| .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, |
| .xpo_secure_port = svc_sock_secure_port, |
| }; |
| |
| static struct svc_xprt_class svc_tcp_bc_class = { |
| .xcl_name = "tcp-bc", |
| .xcl_owner = THIS_MODULE, |
| .xcl_ops = &svc_tcp_bc_ops, |
| .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, |
| }; |
| |
| static void svc_init_bc_xprt_sock(void) |
| { |
| svc_reg_xprt_class(&svc_tcp_bc_class); |
| } |
| |
| static void svc_cleanup_bc_xprt_sock(void) |
| { |
| svc_unreg_xprt_class(&svc_tcp_bc_class); |
| } |
| #else /* CONFIG_SUNRPC_BACKCHANNEL */ |
| static void svc_init_bc_xprt_sock(void) |
| { |
| } |
| |
| static void svc_cleanup_bc_xprt_sock(void) |
| { |
| } |
| #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
| |
| static struct svc_xprt_ops svc_tcp_ops = { |
| .xpo_create = svc_tcp_create, |
| .xpo_recvfrom = svc_tcp_recvfrom, |
| .xpo_sendto = svc_tcp_sendto, |
| .xpo_release_rqst = svc_release_skb, |
| .xpo_detach = svc_tcp_sock_detach, |
| .xpo_free = svc_sock_free, |
| .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, |
| .xpo_has_wspace = svc_tcp_has_wspace, |
| .xpo_accept = svc_tcp_accept, |
| .xpo_secure_port = svc_sock_secure_port, |
| .xpo_kill_temp_xprt = svc_tcp_kill_temp_xprt, |
| }; |
| |
| static struct svc_xprt_class svc_tcp_class = { |
| .xcl_name = "tcp", |
| .xcl_owner = THIS_MODULE, |
| .xcl_ops = &svc_tcp_ops, |
| .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, |
| .xcl_ident = XPRT_TRANSPORT_TCP, |
| }; |
| |
| void svc_init_xprt_sock(void) |
| { |
| svc_reg_xprt_class(&svc_tcp_class); |
| svc_reg_xprt_class(&svc_udp_class); |
| svc_init_bc_xprt_sock(); |
| } |
| |
| void svc_cleanup_xprt_sock(void) |
| { |
| svc_unreg_xprt_class(&svc_tcp_class); |
| svc_unreg_xprt_class(&svc_udp_class); |
| svc_cleanup_bc_xprt_sock(); |
| } |
| |
| static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv) |
| { |
| struct sock *sk = svsk->sk_sk; |
| |
| svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_tcp_class, |
| &svsk->sk_xprt, serv); |
| set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
| if (sk->sk_state == TCP_LISTEN) { |
| dprintk("setting up TCP socket for listening\n"); |
| set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags); |
| sk->sk_data_ready = svc_tcp_listen_data_ready; |
| set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
| } else { |
| dprintk("setting up TCP socket for reading\n"); |
| sk->sk_state_change = svc_tcp_state_change; |
| sk->sk_data_ready = svc_data_ready; |
| sk->sk_write_space = svc_write_space; |
| |
| svsk->sk_reclen = 0; |
| svsk->sk_tcplen = 0; |
| svsk->sk_datalen = 0; |
| memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages)); |
| |
| tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; |
| |
| set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
| switch (sk->sk_state) { |
| case TCP_SYN_RECV: |
| case TCP_ESTABLISHED: |
| break; |
| default: |
| set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
| } |
| } |
| } |
| |
| void svc_sock_update_bufs(struct svc_serv *serv) |
| { |
| /* |
| * The number of server threads has changed. Update |
| * rcvbuf and sndbuf accordingly on all sockets |
| */ |
| struct svc_sock *svsk; |
| |
| spin_lock_bh(&serv->sv_lock); |
| list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) |
| set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
| spin_unlock_bh(&serv->sv_lock); |
| } |
| EXPORT_SYMBOL_GPL(svc_sock_update_bufs); |
| |
| /* |
| * Initialize socket for RPC use and create svc_sock struct |
| */ |
| static struct svc_sock *svc_setup_socket(struct svc_serv *serv, |
| struct socket *sock, |
| int flags) |
| { |
| struct svc_sock *svsk; |
| struct sock *inet; |
| int pmap_register = !(flags & SVC_SOCK_ANONYMOUS); |
| int err = 0; |
| |
| dprintk("svc: svc_setup_socket %p\n", sock); |
| svsk = kzalloc(sizeof(*svsk), GFP_KERNEL); |
| if (!svsk) |
| return ERR_PTR(-ENOMEM); |
| |
| inet = sock->sk; |
| |
| /* Register socket with portmapper */ |
| if (pmap_register) |
| err = svc_register(serv, sock_net(sock->sk), inet->sk_family, |
| inet->sk_protocol, |
| ntohs(inet_sk(inet)->inet_sport)); |
| |
| if (err < 0) { |
| kfree(svsk); |
| return ERR_PTR(err); |
| } |
| |
| inet->sk_user_data = svsk; |
| svsk->sk_sock = sock; |
| svsk->sk_sk = inet; |
| svsk->sk_ostate = inet->sk_state_change; |
| svsk->sk_odata = inet->sk_data_ready; |
| svsk->sk_owspace = inet->sk_write_space; |
| |
| /* Initialize the socket */ |
| if (sock->type == SOCK_DGRAM) |
| svc_udp_init(svsk, serv); |
| else |
| svc_tcp_init(svsk, serv); |
| |
| dprintk("svc: svc_setup_socket created %p (inet %p), " |
| "listen %d close %d\n", |
| svsk, svsk->sk_sk, |
| test_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags), |
| test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags)); |
| |
| return svsk; |
| } |
| |
| bool svc_alien_sock(struct net *net, int fd) |
| { |
| int err; |
| struct socket *sock = sockfd_lookup(fd, &err); |
| bool ret = false; |
| |
| if (!sock) |
| goto out; |
| if (sock_net(sock->sk) != net) |
| ret = true; |
| sockfd_put(sock); |
| out: |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(svc_alien_sock); |
| |
| /** |
| * svc_addsock - add a listener socket to an RPC service |
| * @serv: pointer to RPC service to which to add a new listener |
| * @fd: file descriptor of the new listener |
| * @name_return: pointer to buffer to fill in with name of listener |
| * @len: size of the buffer |
| * |
| * Fills in socket name and returns positive length of name if successful. |
| * Name is terminated with '\n'. On error, returns a negative errno |
| * value. |
| */ |
| int svc_addsock(struct svc_serv *serv, const int fd, char *name_return, |
| const size_t len) |
| { |
| int err = 0; |
| struct socket *so = sockfd_lookup(fd, &err); |
| struct svc_sock *svsk = NULL; |
| struct sockaddr_storage addr; |
| struct sockaddr *sin = (struct sockaddr *)&addr; |
| int salen; |
| |
| if (!so) |
| return err; |
| err = -EAFNOSUPPORT; |
| if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6)) |
| goto out; |
| err = -EPROTONOSUPPORT; |
| if (so->sk->sk_protocol != IPPROTO_TCP && |
| so->sk->sk_protocol != IPPROTO_UDP) |
| goto out; |
| err = -EISCONN; |
| if (so->state > SS_UNCONNECTED) |
| goto out; |
| err = -ENOENT; |
| if (!try_module_get(THIS_MODULE)) |
| goto out; |
| svsk = svc_setup_socket(serv, so, SVC_SOCK_DEFAULTS); |
| if (IS_ERR(svsk)) { |
| module_put(THIS_MODULE); |
| err = PTR_ERR(svsk); |
| goto out; |
| } |
| if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0) |
| svc_xprt_set_local(&svsk->sk_xprt, sin, salen); |
| svc_add_new_perm_xprt(serv, &svsk->sk_xprt); |
| return svc_one_sock_name(svsk, name_return, len); |
| out: |
| sockfd_put(so); |
| return err; |
| } |
| EXPORT_SYMBOL_GPL(svc_addsock); |
| |
| /* |
| * Create socket for RPC service. |
| */ |
| static struct svc_xprt *svc_create_socket(struct svc_serv *serv, |
| int protocol, |
| struct net *net, |
| struct sockaddr *sin, int len, |
| int flags) |
| { |
| struct svc_sock *svsk; |
| struct socket *sock; |
| int error; |
| int type; |
| struct sockaddr_storage addr; |
| struct sockaddr *newsin = (struct sockaddr *)&addr; |
| int newlen; |
| int family; |
| int val; |
| RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
| |
| dprintk("svc: svc_create_socket(%s, %d, %s)\n", |
| serv->sv_program->pg_name, protocol, |
| __svc_print_addr(sin, buf, sizeof(buf))); |
| |
| if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) { |
| printk(KERN_WARNING "svc: only UDP and TCP " |
| "sockets supported\n"); |
| return ERR_PTR(-EINVAL); |
| } |
| |
| type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM; |
| switch (sin->sa_family) { |
| case AF_INET6: |
| family = PF_INET6; |
| break; |
| case AF_INET: |
| family = PF_INET; |
| break; |
| default: |
| return ERR_PTR(-EINVAL); |
| } |
| |
| error = __sock_create(net, family, type, protocol, &sock, 1); |
| if (error < 0) |
| return ERR_PTR(error); |
| |
| svc_reclassify_socket(sock); |
| |
| /* |
| * If this is an PF_INET6 listener, we want to avoid |
| * getting requests from IPv4 remotes. Those should |
| * be shunted to a PF_INET listener via rpcbind. |
| */ |
| val = 1; |
| if (family == PF_INET6) |
| kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY, |
| (char *)&val, sizeof(val)); |
| |
| if (type == SOCK_STREAM) |
| sock->sk->sk_reuse = SK_CAN_REUSE; /* allow address reuse */ |
| error = kernel_bind(sock, sin, len); |
| if (error < 0) |
| goto bummer; |
| |
| newlen = len; |
| error = kernel_getsockname(sock, newsin, &newlen); |
| if (error < 0) |
| goto bummer; |
| |
| if (protocol == IPPROTO_TCP) { |
| if ((error = kernel_listen(sock, 64)) < 0) |
| goto bummer; |
| } |
| |
| svsk = svc_setup_socket(serv, sock, flags); |
| if (IS_ERR(svsk)) { |
| error = PTR_ERR(svsk); |
| goto bummer; |
| } |
| svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen); |
| return (struct svc_xprt *)svsk; |
| bummer: |
| dprintk("svc: svc_create_socket error = %d\n", -error); |
| sock_release(sock); |
| return ERR_PTR(error); |
| } |
| |
| /* |
| * Detach the svc_sock from the socket so that no |
| * more callbacks occur. |
| */ |
| static void svc_sock_detach(struct svc_xprt *xprt) |
| { |
| struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
| struct sock *sk = svsk->sk_sk; |
| |
| dprintk("svc: svc_sock_detach(%p)\n", svsk); |
| |
| /* put back the old socket callbacks */ |
| lock_sock(sk); |
| sk->sk_state_change = svsk->sk_ostate; |
| sk->sk_data_ready = svsk->sk_odata; |
| sk->sk_write_space = svsk->sk_owspace; |
| sk->sk_user_data = NULL; |
| release_sock(sk); |
| } |
| |
| /* |
| * Disconnect the socket, and reset the callbacks |
| */ |
| static void svc_tcp_sock_detach(struct svc_xprt *xprt) |
| { |
| struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
| |
| dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk); |
| |
| svc_sock_detach(xprt); |
| |
| if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) { |
| svc_tcp_clear_pages(svsk); |
| kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR); |
| } |
| } |
| |
| /* |
| * Free the svc_sock's socket resources and the svc_sock itself. |
| */ |
| static void svc_sock_free(struct svc_xprt *xprt) |
| { |
| struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
| dprintk("svc: svc_sock_free(%p)\n", svsk); |
| |
| if (svsk->sk_sock->file) |
| sockfd_put(svsk->sk_sock); |
| else |
| sock_release(svsk->sk_sock); |
| kfree(svsk); |
| } |
| |
| #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
| /* |
| * Create a back channel svc_xprt which shares the fore channel socket. |
| */ |
| static struct svc_xprt *svc_bc_create_socket(struct svc_serv *serv, |
| int protocol, |
| struct net *net, |
| struct sockaddr *sin, int len, |
| int flags) |
| { |
| struct svc_sock *svsk; |
| struct svc_xprt *xprt; |
| |
| if (protocol != IPPROTO_TCP) { |
| printk(KERN_WARNING "svc: only TCP sockets" |
| " supported on shared back channel\n"); |
| return ERR_PTR(-EINVAL); |
| } |
| |
| svsk = kzalloc(sizeof(*svsk), GFP_KERNEL); |
| if (!svsk) |
| return ERR_PTR(-ENOMEM); |
| |
| xprt = &svsk->sk_xprt; |
| svc_xprt_init(net, &svc_tcp_bc_class, xprt, serv); |
| |
| serv->sv_bc_xprt = xprt; |
| |
| return xprt; |
| } |
| |
| /* |
| * Free a back channel svc_sock. |
| */ |
| static void svc_bc_sock_free(struct svc_xprt *xprt) |
| { |
| if (xprt) |
| kfree(container_of(xprt, struct svc_sock, sk_xprt)); |
| } |
| #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |