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TOMOYO Linux Cross Reference
Linux/net/unix/diag.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 #include <linux/types.h>
  3 #include <linux/spinlock.h>
  4 #include <linux/sock_diag.h>
  5 #include <linux/unix_diag.h>
  6 #include <linux/skbuff.h>
  7 #include <linux/module.h>
  8 #include <linux/uidgid.h>
  9 #include <net/netlink.h>
 10 #include <net/af_unix.h>
 11 #include <net/tcp_states.h>
 12 #include <net/sock.h>
 13 
 14 static int sk_diag_dump_name(struct sock *sk, struct sk_buff *nlskb)
 15 {
 16         /* might or might not have unix_table_lock */
 17         struct unix_address *addr = smp_load_acquire(&unix_sk(sk)->addr);
 18 
 19         if (!addr)
 20                 return 0;
 21 
 22         return nla_put(nlskb, UNIX_DIAG_NAME, addr->len - sizeof(short),
 23                        addr->name->sun_path);
 24 }
 25 
 26 static int sk_diag_dump_vfs(struct sock *sk, struct sk_buff *nlskb)
 27 {
 28         struct dentry *dentry = unix_sk(sk)->path.dentry;
 29 
 30         if (dentry) {
 31                 struct unix_diag_vfs uv = {
 32                         .udiag_vfs_ino = d_backing_inode(dentry)->i_ino,
 33                         .udiag_vfs_dev = dentry->d_sb->s_dev,
 34                 };
 35 
 36                 return nla_put(nlskb, UNIX_DIAG_VFS, sizeof(uv), &uv);
 37         }
 38 
 39         return 0;
 40 }
 41 
 42 static int sk_diag_dump_peer(struct sock *sk, struct sk_buff *nlskb)
 43 {
 44         struct sock *peer;
 45         int ino;
 46 
 47         peer = unix_peer_get(sk);
 48         if (peer) {
 49                 unix_state_lock(peer);
 50                 ino = sock_i_ino(peer);
 51                 unix_state_unlock(peer);
 52                 sock_put(peer);
 53 
 54                 return nla_put_u32(nlskb, UNIX_DIAG_PEER, ino);
 55         }
 56 
 57         return 0;
 58 }
 59 
 60 static int sk_diag_dump_icons(struct sock *sk, struct sk_buff *nlskb)
 61 {
 62         struct sk_buff *skb;
 63         struct nlattr *attr;
 64         u32 *buf;
 65         int i;
 66 
 67         if (sk->sk_state == TCP_LISTEN) {
 68                 spin_lock(&sk->sk_receive_queue.lock);
 69 
 70                 attr = nla_reserve(nlskb, UNIX_DIAG_ICONS,
 71                                    sk->sk_receive_queue.qlen * sizeof(u32));
 72                 if (!attr)
 73                         goto errout;
 74 
 75                 buf = nla_data(attr);
 76                 i = 0;
 77                 skb_queue_walk(&sk->sk_receive_queue, skb) {
 78                         struct sock *req, *peer;
 79 
 80                         req = skb->sk;
 81                         /*
 82                          * The state lock is outer for the same sk's
 83                          * queue lock. With the other's queue locked it's
 84                          * OK to lock the state.
 85                          */
 86                         unix_state_lock_nested(req);
 87                         peer = unix_sk(req)->peer;
 88                         buf[i++] = (peer ? sock_i_ino(peer) : 0);
 89                         unix_state_unlock(req);
 90                 }
 91                 spin_unlock(&sk->sk_receive_queue.lock);
 92         }
 93 
 94         return 0;
 95 
 96 errout:
 97         spin_unlock(&sk->sk_receive_queue.lock);
 98         return -EMSGSIZE;
 99 }
100 
101 static int sk_diag_show_rqlen(struct sock *sk, struct sk_buff *nlskb)
102 {
103         struct unix_diag_rqlen rql;
104 
105         if (sk->sk_state == TCP_LISTEN) {
106                 rql.udiag_rqueue = sk->sk_receive_queue.qlen;
107                 rql.udiag_wqueue = sk->sk_max_ack_backlog;
108         } else {
109                 rql.udiag_rqueue = (u32) unix_inq_len(sk);
110                 rql.udiag_wqueue = (u32) unix_outq_len(sk);
111         }
112 
113         return nla_put(nlskb, UNIX_DIAG_RQLEN, sizeof(rql), &rql);
114 }
115 
116 static int sk_diag_dump_uid(struct sock *sk, struct sk_buff *nlskb)
117 {
118         uid_t uid = from_kuid_munged(sk_user_ns(nlskb->sk), sock_i_uid(sk));
119         return nla_put(nlskb, UNIX_DIAG_UID, sizeof(uid_t), &uid);
120 }
121 
122 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, struct unix_diag_req *req,
123                 u32 portid, u32 seq, u32 flags, int sk_ino)
124 {
125         struct nlmsghdr *nlh;
126         struct unix_diag_msg *rep;
127 
128         nlh = nlmsg_put(skb, portid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rep),
129                         flags);
130         if (!nlh)
131                 return -EMSGSIZE;
132 
133         rep = nlmsg_data(nlh);
134         rep->udiag_family = AF_UNIX;
135         rep->udiag_type = sk->sk_type;
136         rep->udiag_state = sk->sk_state;
137         rep->pad = 0;
138         rep->udiag_ino = sk_ino;
139         sock_diag_save_cookie(sk, rep->udiag_cookie);
140 
141         if ((req->udiag_show & UDIAG_SHOW_NAME) &&
142             sk_diag_dump_name(sk, skb))
143                 goto out_nlmsg_trim;
144 
145         if ((req->udiag_show & UDIAG_SHOW_VFS) &&
146             sk_diag_dump_vfs(sk, skb))
147                 goto out_nlmsg_trim;
148 
149         if ((req->udiag_show & UDIAG_SHOW_PEER) &&
150             sk_diag_dump_peer(sk, skb))
151                 goto out_nlmsg_trim;
152 
153         if ((req->udiag_show & UDIAG_SHOW_ICONS) &&
154             sk_diag_dump_icons(sk, skb))
155                 goto out_nlmsg_trim;
156 
157         if ((req->udiag_show & UDIAG_SHOW_RQLEN) &&
158             sk_diag_show_rqlen(sk, skb))
159                 goto out_nlmsg_trim;
160 
161         if ((req->udiag_show & UDIAG_SHOW_MEMINFO) &&
162             sock_diag_put_meminfo(sk, skb, UNIX_DIAG_MEMINFO))
163                 goto out_nlmsg_trim;
164 
165         if (nla_put_u8(skb, UNIX_DIAG_SHUTDOWN, sk->sk_shutdown))
166                 goto out_nlmsg_trim;
167 
168         if ((req->udiag_show & UDIAG_SHOW_UID) &&
169             sk_diag_dump_uid(sk, skb))
170                 goto out_nlmsg_trim;
171 
172         nlmsg_end(skb, nlh);
173         return 0;
174 
175 out_nlmsg_trim:
176         nlmsg_cancel(skb, nlh);
177         return -EMSGSIZE;
178 }
179 
180 static int sk_diag_dump(struct sock *sk, struct sk_buff *skb, struct unix_diag_req *req,
181                 u32 portid, u32 seq, u32 flags)
182 {
183         int sk_ino;
184 
185         unix_state_lock(sk);
186         sk_ino = sock_i_ino(sk);
187         unix_state_unlock(sk);
188 
189         if (!sk_ino)
190                 return 0;
191 
192         return sk_diag_fill(sk, skb, req, portid, seq, flags, sk_ino);
193 }
194 
195 static int unix_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
196 {
197         struct unix_diag_req *req;
198         int num, s_num, slot, s_slot;
199         struct net *net = sock_net(skb->sk);
200 
201         req = nlmsg_data(cb->nlh);
202 
203         s_slot = cb->args[0];
204         num = s_num = cb->args[1];
205 
206         spin_lock(&unix_table_lock);
207         for (slot = s_slot;
208              slot < ARRAY_SIZE(unix_socket_table);
209              s_num = 0, slot++) {
210                 struct sock *sk;
211 
212                 num = 0;
213                 sk_for_each(sk, &unix_socket_table[slot]) {
214                         if (!net_eq(sock_net(sk), net))
215                                 continue;
216                         if (num < s_num)
217                                 goto next;
218                         if (!(req->udiag_states & (1 << sk->sk_state)))
219                                 goto next;
220                         if (sk_diag_dump(sk, skb, req,
221                                          NETLINK_CB(cb->skb).portid,
222                                          cb->nlh->nlmsg_seq,
223                                          NLM_F_MULTI) < 0)
224                                 goto done;
225 next:
226                         num++;
227                 }
228         }
229 done:
230         spin_unlock(&unix_table_lock);
231         cb->args[0] = slot;
232         cb->args[1] = num;
233 
234         return skb->len;
235 }
236 
237 static struct sock *unix_lookup_by_ino(unsigned int ino)
238 {
239         int i;
240         struct sock *sk;
241 
242         spin_lock(&unix_table_lock);
243         for (i = 0; i < ARRAY_SIZE(unix_socket_table); i++) {
244                 sk_for_each(sk, &unix_socket_table[i])
245                         if (ino == sock_i_ino(sk)) {
246                                 sock_hold(sk);
247                                 spin_unlock(&unix_table_lock);
248 
249                                 return sk;
250                         }
251         }
252 
253         spin_unlock(&unix_table_lock);
254         return NULL;
255 }
256 
257 static int unix_diag_get_exact(struct sk_buff *in_skb,
258                                const struct nlmsghdr *nlh,
259                                struct unix_diag_req *req)
260 {
261         int err = -EINVAL;
262         struct sock *sk;
263         struct sk_buff *rep;
264         unsigned int extra_len;
265         struct net *net = sock_net(in_skb->sk);
266 
267         if (req->udiag_ino == 0)
268                 goto out_nosk;
269 
270         sk = unix_lookup_by_ino(req->udiag_ino);
271         err = -ENOENT;
272         if (sk == NULL)
273                 goto out_nosk;
274         if (!net_eq(sock_net(sk), net))
275                 goto out;
276 
277         err = sock_diag_check_cookie(sk, req->udiag_cookie);
278         if (err)
279                 goto out;
280 
281         extra_len = 256;
282 again:
283         err = -ENOMEM;
284         rep = nlmsg_new(sizeof(struct unix_diag_msg) + extra_len, GFP_KERNEL);
285         if (!rep)
286                 goto out;
287 
288         err = sk_diag_fill(sk, rep, req, NETLINK_CB(in_skb).portid,
289                            nlh->nlmsg_seq, 0, req->udiag_ino);
290         if (err < 0) {
291                 nlmsg_free(rep);
292                 extra_len += 256;
293                 if (extra_len >= PAGE_SIZE)
294                         goto out;
295 
296                 goto again;
297         }
298         err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
299                               MSG_DONTWAIT);
300         if (err > 0)
301                 err = 0;
302 out:
303         if (sk)
304                 sock_put(sk);
305 out_nosk:
306         return err;
307 }
308 
309 static int unix_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
310 {
311         int hdrlen = sizeof(struct unix_diag_req);
312         struct net *net = sock_net(skb->sk);
313 
314         if (nlmsg_len(h) < hdrlen)
315                 return -EINVAL;
316 
317         if (h->nlmsg_flags & NLM_F_DUMP) {
318                 struct netlink_dump_control c = {
319                         .dump = unix_diag_dump,
320                 };
321                 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
322         } else
323                 return unix_diag_get_exact(skb, h, nlmsg_data(h));
324 }
325 
326 static const struct sock_diag_handler unix_diag_handler = {
327         .family = AF_UNIX,
328         .dump = unix_diag_handler_dump,
329 };
330 
331 static int __init unix_diag_init(void)
332 {
333         return sock_diag_register(&unix_diag_handler);
334 }
335 
336 static void __exit unix_diag_exit(void)
337 {
338         sock_diag_unregister(&unix_diag_handler);
339 }
340 
341 module_init(unix_diag_init);
342 module_exit(unix_diag_exit);
343 MODULE_LICENSE("GPL");
344 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 1 /* AF_LOCAL */);
345 

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