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

Version: ~ [ linux-5.12-rc7 ] ~ [ linux-5.11.13 ] ~ [ linux-5.10.29 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.111 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.186 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.230 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.266 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.266 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

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

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