Commit | Line | Data |
---|---|---|
22931d3b PE |
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> | |
2ea744a5 | 6 | #include <linux/module.h> |
22931d3b PE |
7 | #include <net/netlink.h> |
8 | #include <net/af_unix.h> | |
9 | #include <net/tcp_states.h> | |
10 | ||
f5248b48 PE |
11 | static int sk_diag_dump_name(struct sock *sk, struct sk_buff *nlskb) |
12 | { | |
13 | struct unix_address *addr = unix_sk(sk)->addr; | |
f5248b48 | 14 | |
4245375d TG |
15 | if (!addr) |
16 | return 0; | |
f5248b48 | 17 | |
4245375d TG |
18 | return nla_put(nlskb, UNIX_DIAG_NAME, addr->len - sizeof(short), |
19 | addr->name->sun_path); | |
f5248b48 PE |
20 | } |
21 | ||
5f7b0569 PE |
22 | static int sk_diag_dump_vfs(struct sock *sk, struct sk_buff *nlskb) |
23 | { | |
40ffe67d | 24 | struct dentry *dentry = unix_sk(sk)->path.dentry; |
5f7b0569 PE |
25 | |
26 | if (dentry) { | |
4245375d TG |
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); | |
5f7b0569 PE |
33 | } |
34 | ||
35 | return 0; | |
5f7b0569 PE |
36 | } |
37 | ||
ac02be8d PE |
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 | ||
4245375d | 50 | return nla_put_u32(nlskb, UNIX_DIAG_PEER, ino); |
ac02be8d PE |
51 | } |
52 | ||
53 | return 0; | |
ac02be8d PE |
54 | } |
55 | ||
2aac7a2c PE |
56 | static int sk_diag_dump_icons(struct sock *sk, struct sk_buff *nlskb) |
57 | { | |
58 | struct sk_buff *skb; | |
4245375d | 59 | struct nlattr *attr; |
2aac7a2c PE |
60 | u32 *buf; |
61 | int i; | |
62 | ||
63 | if (sk->sk_state == TCP_LISTEN) { | |
64 | spin_lock(&sk->sk_receive_queue.lock); | |
4245375d TG |
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); | |
2aac7a2c PE |
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; | |
e09e9d18 | 84 | buf[i++] = (peer ? sock_i_ino(peer) : 0); |
2aac7a2c PE |
85 | unix_state_unlock(req); |
86 | } | |
87 | spin_unlock(&sk->sk_receive_queue.lock); | |
88 | } | |
89 | ||
90 | return 0; | |
91 | ||
4245375d | 92 | errout: |
2aac7a2c PE |
93 | spin_unlock(&sk->sk_receive_queue.lock); |
94 | return -EMSGSIZE; | |
95 | } | |
96 | ||
cbf39195 PE |
97 | static int sk_diag_show_rqlen(struct sock *sk, struct sk_buff *nlskb) |
98 | { | |
4245375d | 99 | struct unix_diag_rqlen rql; |
c9da99e6 PE |
100 | |
101 | if (sk->sk_state == TCP_LISTEN) { | |
4245375d TG |
102 | rql.udiag_rqueue = sk->sk_receive_queue.qlen; |
103 | rql.udiag_wqueue = sk->sk_max_ack_backlog; | |
c9da99e6 | 104 | } else { |
4245375d TG |
105 | rql.udiag_rqueue = (u32) unix_inq_len(sk); |
106 | rql.udiag_wqueue = (u32) unix_outq_len(sk); | |
c9da99e6 PE |
107 | } |
108 | ||
4245375d | 109 | return nla_put(nlskb, UNIX_DIAG_RQLEN, sizeof(rql), &rql); |
cbf39195 PE |
110 | } |
111 | ||
45a96b9b | 112 | static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, struct unix_diag_req *req, |
15e47304 | 113 | u32 portid, u32 seq, u32 flags, int sk_ino) |
45a96b9b | 114 | { |
45a96b9b PE |
115 | struct nlmsghdr *nlh; |
116 | struct unix_diag_msg *rep; | |
117 | ||
15e47304 | 118 | nlh = nlmsg_put(skb, portid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rep), |
4245375d | 119 | flags); |
b61bb019 | 120 | if (!nlh) |
4245375d | 121 | return -EMSGSIZE; |
45a96b9b | 122 | |
b61bb019 | 123 | rep = nlmsg_data(nlh); |
45a96b9b PE |
124 | rep->udiag_family = AF_UNIX; |
125 | rep->udiag_type = sk->sk_type; | |
126 | rep->udiag_state = sk->sk_state; | |
127 | rep->udiag_ino = sk_ino; | |
128 | sock_diag_save_cookie(sk, rep->udiag_cookie); | |
129 | ||
f5248b48 | 130 | if ((req->udiag_show & UDIAG_SHOW_NAME) && |
257b5298 | 131 | sk_diag_dump_name(sk, skb)) |
b61bb019 | 132 | goto out_nlmsg_trim; |
f5248b48 | 133 | |
5f7b0569 | 134 | if ((req->udiag_show & UDIAG_SHOW_VFS) && |
257b5298 | 135 | sk_diag_dump_vfs(sk, skb)) |
b61bb019 | 136 | goto out_nlmsg_trim; |
5f7b0569 | 137 | |
ac02be8d | 138 | if ((req->udiag_show & UDIAG_SHOW_PEER) && |
257b5298 | 139 | sk_diag_dump_peer(sk, skb)) |
b61bb019 | 140 | goto out_nlmsg_trim; |
ac02be8d | 141 | |
2aac7a2c | 142 | if ((req->udiag_show & UDIAG_SHOW_ICONS) && |
257b5298 | 143 | sk_diag_dump_icons(sk, skb)) |
b61bb019 | 144 | goto out_nlmsg_trim; |
2aac7a2c | 145 | |
cbf39195 | 146 | if ((req->udiag_show & UDIAG_SHOW_RQLEN) && |
257b5298 | 147 | sk_diag_show_rqlen(sk, skb)) |
b61bb019 | 148 | goto out_nlmsg_trim; |
257b5298 PE |
149 | |
150 | if ((req->udiag_show & UDIAG_SHOW_MEMINFO) && | |
151 | sock_diag_put_meminfo(sk, skb, UNIX_DIAG_MEMINFO)) | |
b61bb019 | 152 | goto out_nlmsg_trim; |
cbf39195 | 153 | |
e4e541a8 PE |
154 | if (nla_put_u8(skb, UNIX_DIAG_SHUTDOWN, sk->sk_shutdown)) |
155 | goto out_nlmsg_trim; | |
156 | ||
4245375d | 157 | return nlmsg_end(skb, nlh); |
45a96b9b | 158 | |
b61bb019 | 159 | out_nlmsg_trim: |
4245375d | 160 | nlmsg_cancel(skb, nlh); |
45a96b9b PE |
161 | return -EMSGSIZE; |
162 | } | |
163 | ||
164 | static int sk_diag_dump(struct sock *sk, struct sk_buff *skb, struct unix_diag_req *req, | |
15e47304 | 165 | u32 portid, u32 seq, u32 flags) |
45a96b9b PE |
166 | { |
167 | int sk_ino; | |
168 | ||
169 | unix_state_lock(sk); | |
170 | sk_ino = sock_i_ino(sk); | |
171 | unix_state_unlock(sk); | |
172 | ||
173 | if (!sk_ino) | |
174 | return 0; | |
175 | ||
15e47304 | 176 | return sk_diag_fill(sk, skb, req, portid, seq, flags, sk_ino); |
45a96b9b PE |
177 | } |
178 | ||
22931d3b PE |
179 | static int unix_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) |
180 | { | |
45a96b9b PE |
181 | struct unix_diag_req *req; |
182 | int num, s_num, slot, s_slot; | |
51d7cccf | 183 | struct net *net = sock_net(skb->sk); |
45a96b9b | 184 | |
b61bb019 | 185 | req = nlmsg_data(cb->nlh); |
45a96b9b PE |
186 | |
187 | s_slot = cb->args[0]; | |
188 | num = s_num = cb->args[1]; | |
189 | ||
190 | spin_lock(&unix_table_lock); | |
7123aaa3 ED |
191 | for (slot = s_slot; |
192 | slot < ARRAY_SIZE(unix_socket_table); | |
193 | s_num = 0, slot++) { | |
45a96b9b | 194 | struct sock *sk; |
45a96b9b PE |
195 | |
196 | num = 0; | |
b67bfe0d | 197 | sk_for_each(sk, &unix_socket_table[slot]) { |
51d7cccf AV |
198 | if (!net_eq(sock_net(sk), net)) |
199 | continue; | |
45a96b9b PE |
200 | if (num < s_num) |
201 | goto next; | |
202 | if (!(req->udiag_states & (1 << sk->sk_state))) | |
203 | goto next; | |
204 | if (sk_diag_dump(sk, skb, req, | |
15e47304 | 205 | NETLINK_CB(cb->skb).portid, |
257b5298 PE |
206 | cb->nlh->nlmsg_seq, |
207 | NLM_F_MULTI) < 0) | |
45a96b9b PE |
208 | goto done; |
209 | next: | |
210 | num++; | |
211 | } | |
212 | } | |
213 | done: | |
214 | spin_unlock(&unix_table_lock); | |
215 | cb->args[0] = slot; | |
216 | cb->args[1] = num; | |
217 | ||
218 | return skb->len; | |
22931d3b PE |
219 | } |
220 | ||
5d3cae8b PE |
221 | static struct sock *unix_lookup_by_ino(int ino) |
222 | { | |
223 | int i; | |
224 | struct sock *sk; | |
225 | ||
226 | spin_lock(&unix_table_lock); | |
7123aaa3 | 227 | for (i = 0; i < ARRAY_SIZE(unix_socket_table); i++) { |
b67bfe0d | 228 | sk_for_each(sk, &unix_socket_table[i]) |
5d3cae8b PE |
229 | if (ino == sock_i_ino(sk)) { |
230 | sock_hold(sk); | |
231 | spin_unlock(&unix_table_lock); | |
232 | ||
233 | return sk; | |
234 | } | |
235 | } | |
236 | ||
237 | spin_unlock(&unix_table_lock); | |
238 | return NULL; | |
239 | } | |
240 | ||
22931d3b PE |
241 | static int unix_diag_get_exact(struct sk_buff *in_skb, |
242 | const struct nlmsghdr *nlh, | |
243 | struct unix_diag_req *req) | |
244 | { | |
5d3cae8b PE |
245 | int err = -EINVAL; |
246 | struct sock *sk; | |
247 | struct sk_buff *rep; | |
248 | unsigned int extra_len; | |
51d7cccf | 249 | struct net *net = sock_net(in_skb->sk); |
5d3cae8b PE |
250 | |
251 | if (req->udiag_ino == 0) | |
252 | goto out_nosk; | |
253 | ||
254 | sk = unix_lookup_by_ino(req->udiag_ino); | |
255 | err = -ENOENT; | |
256 | if (sk == NULL) | |
257 | goto out_nosk; | |
258 | ||
259 | err = sock_diag_check_cookie(sk, req->udiag_cookie); | |
260 | if (err) | |
261 | goto out; | |
262 | ||
263 | extra_len = 256; | |
264 | again: | |
265 | err = -ENOMEM; | |
4245375d | 266 | rep = nlmsg_new(sizeof(struct unix_diag_msg) + extra_len, GFP_KERNEL); |
5d3cae8b PE |
267 | if (!rep) |
268 | goto out; | |
269 | ||
15e47304 | 270 | err = sk_diag_fill(sk, rep, req, NETLINK_CB(in_skb).portid, |
5d3cae8b PE |
271 | nlh->nlmsg_seq, 0, req->udiag_ino); |
272 | if (err < 0) { | |
4245375d | 273 | nlmsg_free(rep); |
5d3cae8b PE |
274 | extra_len += 256; |
275 | if (extra_len >= PAGE_SIZE) | |
276 | goto out; | |
277 | ||
278 | goto again; | |
279 | } | |
15e47304 | 280 | err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid, |
5d3cae8b PE |
281 | MSG_DONTWAIT); |
282 | if (err > 0) | |
283 | err = 0; | |
284 | out: | |
285 | if (sk) | |
286 | sock_put(sk); | |
287 | out_nosk: | |
288 | return err; | |
22931d3b PE |
289 | } |
290 | ||
291 | static int unix_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h) | |
292 | { | |
293 | int hdrlen = sizeof(struct unix_diag_req); | |
51d7cccf | 294 | struct net *net = sock_net(skb->sk); |
22931d3b PE |
295 | |
296 | if (nlmsg_len(h) < hdrlen) | |
297 | return -EINVAL; | |
298 | ||
80d326fa PNA |
299 | if (h->nlmsg_flags & NLM_F_DUMP) { |
300 | struct netlink_dump_control c = { | |
301 | .dump = unix_diag_dump, | |
302 | }; | |
51d7cccf | 303 | return netlink_dump_start(net->diag_nlsk, skb, h, &c); |
80d326fa | 304 | } else |
b61bb019 | 305 | return unix_diag_get_exact(skb, h, nlmsg_data(h)); |
22931d3b PE |
306 | } |
307 | ||
8dcf01fc | 308 | static const struct sock_diag_handler unix_diag_handler = { |
22931d3b PE |
309 | .family = AF_UNIX, |
310 | .dump = unix_diag_handler_dump, | |
311 | }; | |
312 | ||
313 | static int __init unix_diag_init(void) | |
314 | { | |
315 | return sock_diag_register(&unix_diag_handler); | |
316 | } | |
317 | ||
318 | static void __exit unix_diag_exit(void) | |
319 | { | |
320 | sock_diag_unregister(&unix_diag_handler); | |
321 | } | |
322 | ||
323 | module_init(unix_diag_init); | |
324 | module_exit(unix_diag_exit); | |
325 | MODULE_LICENSE("GPL"); | |
326 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 1 /* AF_LOCAL */); |