blob: 8cbe6de1f07531b03edfd1ff0094e387607fb343 [file] [log] [blame]
Andrey Vagineaaa3132013-03-21 20:33:48 +04001#include <linux/module.h>
2
3#include <net/sock.h>
4#include <linux/netlink.h>
5#include <linux/sock_diag.h>
6#include <linux/netlink_diag.h>
Thomas Grafe3416942014-08-02 11:47:45 +02007#include <linux/rhashtable.h>
Andrey Vagineaaa3132013-03-21 20:33:48 +04008
9#include "af_netlink.h"
10
11static int sk_diag_dump_groups(struct sock *sk, struct sk_buff *nlskb)
12{
13 struct netlink_sock *nlk = nlk_sk(sk);
14
15 if (nlk->groups == NULL)
16 return 0;
17
18 return nla_put(nlskb, NETLINK_DIAG_GROUPS, NLGRPSZ(nlk->ngroups),
19 nlk->groups);
20}
21
Andrey Vagin457c79e2017-04-03 18:13:32 -070022static int sk_diag_put_flags(struct sock *sk, struct sk_buff *skb)
23{
24 struct netlink_sock *nlk = nlk_sk(sk);
25 u32 flags = 0;
26
27 if (nlk->cb_running)
28 flags |= NDIAG_FLAG_CB_RUNNING;
29 if (nlk->flags & NETLINK_F_RECV_PKTINFO)
30 flags |= NDIAG_FLAG_PKTINFO;
31 if (nlk->flags & NETLINK_F_BROADCAST_SEND_ERROR)
32 flags |= NDIAG_FLAG_BROADCAST_ERROR;
33 if (nlk->flags & NETLINK_F_RECV_NO_ENOBUFS)
34 flags |= NDIAG_FLAG_NO_ENOBUFS;
35 if (nlk->flags & NETLINK_F_LISTEN_ALL_NSID)
36 flags |= NDIAG_FLAG_LISTEN_ALL_NSID;
37 if (nlk->flags & NETLINK_F_CAP_ACK)
38 flags |= NDIAG_FLAG_CAP_ACK;
39
40 return nla_put_u32(skb, NETLINK_DIAG_FLAGS, flags);
41}
42
Andrey Vagineaaa3132013-03-21 20:33:48 +040043static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
44 struct netlink_diag_req *req,
45 u32 portid, u32 seq, u32 flags, int sk_ino)
46{
47 struct nlmsghdr *nlh;
48 struct netlink_diag_msg *rep;
49 struct netlink_sock *nlk = nlk_sk(sk);
50
51 nlh = nlmsg_put(skb, portid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rep),
52 flags);
53 if (!nlh)
54 return -EMSGSIZE;
55
56 rep = nlmsg_data(nlh);
57 rep->ndiag_family = AF_NETLINK;
58 rep->ndiag_type = sk->sk_type;
59 rep->ndiag_protocol = sk->sk_protocol;
60 rep->ndiag_state = sk->sk_state;
61
62 rep->ndiag_ino = sk_ino;
63 rep->ndiag_portid = nlk->portid;
64 rep->ndiag_dst_portid = nlk->dst_portid;
65 rep->ndiag_dst_group = nlk->dst_group;
66 sock_diag_save_cookie(sk, rep->ndiag_cookie);
67
68 if ((req->ndiag_show & NDIAG_SHOW_GROUPS) &&
69 sk_diag_dump_groups(sk, skb))
70 goto out_nlmsg_trim;
71
72 if ((req->ndiag_show & NDIAG_SHOW_MEMINFO) &&
73 sock_diag_put_meminfo(sk, skb, NETLINK_DIAG_MEMINFO))
74 goto out_nlmsg_trim;
75
Andrey Vagin457c79e2017-04-03 18:13:32 -070076 if ((req->ndiag_show & NDIAG_SHOW_FLAGS) &&
77 sk_diag_put_flags(sk, skb))
78 goto out_nlmsg_trim;
79
Johannes Berg053c0952015-01-16 22:09:00 +010080 nlmsg_end(skb, nlh);
81 return 0;
Andrey Vagineaaa3132013-03-21 20:33:48 +040082
83out_nlmsg_trim:
84 nlmsg_cancel(skb, nlh);
85 return -EMSGSIZE;
86}
87
88static int __netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
89 int protocol, int s_num)
90{
Herbert Xuad202072016-08-19 16:21:37 +080091 struct rhashtable_iter *hti = (void *)cb->args[2];
Andrey Vagineaaa3132013-03-21 20:33:48 +040092 struct netlink_table *tbl = &nl_table[protocol];
Andrey Vagineaaa3132013-03-21 20:33:48 +040093 struct net *net = sock_net(skb->sk);
94 struct netlink_diag_req *req;
Thomas Grafe3416942014-08-02 11:47:45 +020095 struct netlink_sock *nlsk;
Eric Dumazetc09e8e32023-06-21 15:43:37 +000096 unsigned long flags;
Andrey Vagineaaa3132013-03-21 20:33:48 +040097 struct sock *sk;
Herbert Xuad202072016-08-19 16:21:37 +080098 int num = 2;
99 int ret = 0;
Andrey Vagineaaa3132013-03-21 20:33:48 +0400100
101 req = nlmsg_data(cb->nlh);
102
Herbert Xuad202072016-08-19 16:21:37 +0800103 if (s_num > 1)
104 goto mc_list;
Thomas Graf88d6ed12015-01-02 23:00:16 +0100105
Herbert Xuad202072016-08-19 16:21:37 +0800106 num--;
Thomas Grafe3416942014-08-02 11:47:45 +0200107
Herbert Xuad202072016-08-19 16:21:37 +0800108 if (!hti) {
109 hti = kmalloc(sizeof(*hti), GFP_KERNEL);
110 if (!hti)
111 return -ENOMEM;
112
113 cb->args[2] = (long)hti;
114 }
115
116 if (!s_num)
117 rhashtable_walk_enter(&tbl->hash, hti);
118
119 ret = rhashtable_walk_start(hti);
120 if (ret == -EAGAIN)
121 ret = 0;
122 if (ret)
123 goto stop;
124
125 while ((nlsk = rhashtable_walk_next(hti))) {
126 if (IS_ERR(nlsk)) {
127 ret = PTR_ERR(nlsk);
128 if (ret == -EAGAIN) {
129 ret = 0;
Andrey Vagineaaa3132013-03-21 20:33:48 +0400130 continue;
131 }
Herbert Xuad202072016-08-19 16:21:37 +0800132 break;
133 }
Andrey Vagineaaa3132013-03-21 20:33:48 +0400134
Herbert Xuad202072016-08-19 16:21:37 +0800135 sk = (struct sock *)nlsk;
Andrey Vagineaaa3132013-03-21 20:33:48 +0400136
Herbert Xuad202072016-08-19 16:21:37 +0800137 if (!net_eq(sock_net(sk), net))
138 continue;
139
140 if (sk_diag_fill(sk, skb, req,
141 NETLINK_CB(cb->skb).portid,
142 cb->nlh->nlmsg_seq,
143 NLM_F_MULTI,
144 sock_i_ino(sk)) < 0) {
145 ret = 1;
146 break;
Andrey Vagineaaa3132013-03-21 20:33:48 +0400147 }
148 }
149
Herbert Xuad202072016-08-19 16:21:37 +0800150stop:
151 rhashtable_walk_stop(hti);
152 if (ret)
153 goto done;
154
155 rhashtable_walk_exit(hti);
Herbert Xuad202072016-08-19 16:21:37 +0800156 num++;
157
158mc_list:
Eric Dumazetc09e8e32023-06-21 15:43:37 +0000159 read_lock_irqsave(&nl_table_lock, flags);
Andrey Vagineaaa3132013-03-21 20:33:48 +0400160 sk_for_each_bound(sk, &tbl->mc_list) {
161 if (sk_hashed(sk))
162 continue;
163 if (!net_eq(sock_net(sk), net))
164 continue;
165 if (num < s_num) {
166 num++;
167 continue;
168 }
169
170 if (sk_diag_fill(sk, skb, req,
171 NETLINK_CB(cb->skb).portid,
172 cb->nlh->nlmsg_seq,
173 NLM_F_MULTI,
Kuniyuki Iwashima62c204a2023-06-26 09:43:13 -0700174 __sock_i_ino(sk)) < 0) {
Andrey Vagineaaa3132013-03-21 20:33:48 +0400175 ret = 1;
Herbert Xuad202072016-08-19 16:21:37 +0800176 break;
Andrey Vagineaaa3132013-03-21 20:33:48 +0400177 }
178 num++;
179 }
Eric Dumazetc09e8e32023-06-21 15:43:37 +0000180 read_unlock_irqrestore(&nl_table_lock, flags);
Herbert Xuad202072016-08-19 16:21:37 +0800181
Andrey Vagineaaa3132013-03-21 20:33:48 +0400182done:
183 cb->args[0] = num;
Andrey Vagineaaa3132013-03-21 20:33:48 +0400184
185 return ret;
186}
187
188static int netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
189{
190 struct netlink_diag_req *req;
191 int s_num = cb->args[0];
Herbert Xuad202072016-08-19 16:21:37 +0800192 int err = 0;
Andrey Vagineaaa3132013-03-21 20:33:48 +0400193
194 req = nlmsg_data(cb->nlh);
195
Andrey Vagineaaa3132013-03-21 20:33:48 +0400196 if (req->sdiag_protocol == NDIAG_PROTO_ALL) {
197 int i;
198
199 for (i = cb->args[1]; i < MAX_LINKS; i++) {
Herbert Xuad202072016-08-19 16:21:37 +0800200 err = __netlink_diag_dump(skb, cb, i, s_num);
201 if (err)
Andrey Vagineaaa3132013-03-21 20:33:48 +0400202 break;
203 s_num = 0;
204 }
Herbert Xuad202072016-08-19 16:21:37 +0800205 cb->args[1] = i;
Andrey Vagineaaa3132013-03-21 20:33:48 +0400206 } else {
Eric Dumazet93636d12016-11-02 20:21:20 -0700207 if (req->sdiag_protocol >= MAX_LINKS)
Andrey Vagineaaa3132013-03-21 20:33:48 +0400208 return -ENOENT;
Andrey Vagineaaa3132013-03-21 20:33:48 +0400209
Herbert Xuad202072016-08-19 16:21:37 +0800210 err = __netlink_diag_dump(skb, cb, req->sdiag_protocol, s_num);
Andrey Vagineaaa3132013-03-21 20:33:48 +0400211 }
212
Herbert Xuad202072016-08-19 16:21:37 +0800213 return err < 0 ? err : skb->len;
214}
Andrey Vagineaaa3132013-03-21 20:33:48 +0400215
Herbert Xuad202072016-08-19 16:21:37 +0800216static int netlink_diag_dump_done(struct netlink_callback *cb)
217{
218 struct rhashtable_iter *hti = (void *)cb->args[2];
219
220 if (cb->args[0] == 1)
221 rhashtable_walk_exit(hti);
222
223 kfree(hti);
224
225 return 0;
Andrey Vagineaaa3132013-03-21 20:33:48 +0400226}
227
228static int netlink_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
229{
230 int hdrlen = sizeof(struct netlink_diag_req);
231 struct net *net = sock_net(skb->sk);
232
233 if (nlmsg_len(h) < hdrlen)
234 return -EINVAL;
235
236 if (h->nlmsg_flags & NLM_F_DUMP) {
237 struct netlink_dump_control c = {
238 .dump = netlink_diag_dump,
Herbert Xuad202072016-08-19 16:21:37 +0800239 .done = netlink_diag_dump_done,
Andrey Vagineaaa3132013-03-21 20:33:48 +0400240 };
241 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
242 } else
243 return -EOPNOTSUPP;
244}
245
246static const struct sock_diag_handler netlink_diag_handler = {
247 .family = AF_NETLINK,
248 .dump = netlink_diag_handler_dump,
249};
250
251static int __init netlink_diag_init(void)
252{
253 return sock_diag_register(&netlink_diag_handler);
254}
255
256static void __exit netlink_diag_exit(void)
257{
258 sock_diag_unregister(&netlink_diag_handler);
259}
260
261module_init(netlink_diag_init);
262module_exit(netlink_diag_exit);
263MODULE_LICENSE("GPL");
264MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 16 /* AF_NETLINK */);