Commit | Line | Data |
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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> | |
6 | #include <net/netlink.h> | |
7 | #include <net/af_unix.h> | |
8 | #include <net/tcp_states.h> | |
9 | ||
10 | #define UNIX_DIAG_PUT(skb, attrtype, attrlen) \ | |
11 | RTA_DATA(__RTA_PUT(skb, attrtype, attrlen)) | |
12 | ||
f5248b48 PE |
13 | static int sk_diag_dump_name(struct sock *sk, struct sk_buff *nlskb) |
14 | { | |
15 | struct unix_address *addr = unix_sk(sk)->addr; | |
16 | char *s; | |
17 | ||
18 | if (addr) { | |
19 | s = UNIX_DIAG_PUT(nlskb, UNIX_DIAG_NAME, addr->len - sizeof(short)); | |
20 | memcpy(s, addr->name->sun_path, addr->len - sizeof(short)); | |
21 | } | |
22 | ||
23 | return 0; | |
24 | ||
25 | rtattr_failure: | |
26 | return -EMSGSIZE; | |
27 | } | |
28 | ||
5f7b0569 PE |
29 | static int sk_diag_dump_vfs(struct sock *sk, struct sk_buff *nlskb) |
30 | { | |
31 | struct dentry *dentry = unix_sk(sk)->dentry; | |
32 | struct unix_diag_vfs *uv; | |
33 | ||
34 | if (dentry) { | |
35 | uv = UNIX_DIAG_PUT(nlskb, UNIX_DIAG_VFS, sizeof(*uv)); | |
36 | uv->udiag_vfs_ino = dentry->d_inode->i_ino; | |
37 | uv->udiag_vfs_dev = dentry->d_sb->s_dev; | |
38 | } | |
39 | ||
40 | return 0; | |
41 | ||
42 | rtattr_failure: | |
43 | return -EMSGSIZE; | |
44 | } | |
45 | ||
45a96b9b PE |
46 | static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, struct unix_diag_req *req, |
47 | u32 pid, u32 seq, u32 flags, int sk_ino) | |
48 | { | |
49 | unsigned char *b = skb_tail_pointer(skb); | |
50 | struct nlmsghdr *nlh; | |
51 | struct unix_diag_msg *rep; | |
52 | ||
53 | nlh = NLMSG_PUT(skb, pid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rep)); | |
54 | nlh->nlmsg_flags = flags; | |
55 | ||
56 | rep = NLMSG_DATA(nlh); | |
57 | ||
58 | rep->udiag_family = AF_UNIX; | |
59 | rep->udiag_type = sk->sk_type; | |
60 | rep->udiag_state = sk->sk_state; | |
61 | rep->udiag_ino = sk_ino; | |
62 | sock_diag_save_cookie(sk, rep->udiag_cookie); | |
63 | ||
f5248b48 PE |
64 | if ((req->udiag_show & UDIAG_SHOW_NAME) && |
65 | sk_diag_dump_name(sk, skb)) | |
66 | goto nlmsg_failure; | |
67 | ||
5f7b0569 PE |
68 | if ((req->udiag_show & UDIAG_SHOW_VFS) && |
69 | sk_diag_dump_vfs(sk, skb)) | |
70 | goto nlmsg_failure; | |
71 | ||
45a96b9b PE |
72 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
73 | return skb->len; | |
74 | ||
75 | nlmsg_failure: | |
76 | nlmsg_trim(skb, b); | |
77 | return -EMSGSIZE; | |
78 | } | |
79 | ||
80 | static int sk_diag_dump(struct sock *sk, struct sk_buff *skb, struct unix_diag_req *req, | |
81 | u32 pid, u32 seq, u32 flags) | |
82 | { | |
83 | int sk_ino; | |
84 | ||
85 | unix_state_lock(sk); | |
86 | sk_ino = sock_i_ino(sk); | |
87 | unix_state_unlock(sk); | |
88 | ||
89 | if (!sk_ino) | |
90 | return 0; | |
91 | ||
92 | return sk_diag_fill(sk, skb, req, pid, seq, flags, sk_ino); | |
93 | } | |
94 | ||
22931d3b PE |
95 | static int unix_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) |
96 | { | |
45a96b9b PE |
97 | struct unix_diag_req *req; |
98 | int num, s_num, slot, s_slot; | |
99 | ||
100 | req = NLMSG_DATA(cb->nlh); | |
101 | ||
102 | s_slot = cb->args[0]; | |
103 | num = s_num = cb->args[1]; | |
104 | ||
105 | spin_lock(&unix_table_lock); | |
106 | for (slot = s_slot; slot <= UNIX_HASH_SIZE; s_num = 0, slot++) { | |
107 | struct sock *sk; | |
108 | struct hlist_node *node; | |
109 | ||
110 | num = 0; | |
111 | sk_for_each(sk, node, &unix_socket_table[slot]) { | |
112 | if (num < s_num) | |
113 | goto next; | |
114 | if (!(req->udiag_states & (1 << sk->sk_state))) | |
115 | goto next; | |
116 | if (sk_diag_dump(sk, skb, req, | |
117 | NETLINK_CB(cb->skb).pid, | |
118 | cb->nlh->nlmsg_seq, | |
119 | NLM_F_MULTI) < 0) | |
120 | goto done; | |
121 | next: | |
122 | num++; | |
123 | } | |
124 | } | |
125 | done: | |
126 | spin_unlock(&unix_table_lock); | |
127 | cb->args[0] = slot; | |
128 | cb->args[1] = num; | |
129 | ||
130 | return skb->len; | |
22931d3b PE |
131 | } |
132 | ||
5d3cae8b PE |
133 | static struct sock *unix_lookup_by_ino(int ino) |
134 | { | |
135 | int i; | |
136 | struct sock *sk; | |
137 | ||
138 | spin_lock(&unix_table_lock); | |
139 | for (i = 0; i <= UNIX_HASH_SIZE; i++) { | |
140 | struct hlist_node *node; | |
141 | ||
142 | sk_for_each(sk, node, &unix_socket_table[i]) | |
143 | if (ino == sock_i_ino(sk)) { | |
144 | sock_hold(sk); | |
145 | spin_unlock(&unix_table_lock); | |
146 | ||
147 | return sk; | |
148 | } | |
149 | } | |
150 | ||
151 | spin_unlock(&unix_table_lock); | |
152 | return NULL; | |
153 | } | |
154 | ||
22931d3b PE |
155 | static int unix_diag_get_exact(struct sk_buff *in_skb, |
156 | const struct nlmsghdr *nlh, | |
157 | struct unix_diag_req *req) | |
158 | { | |
5d3cae8b PE |
159 | int err = -EINVAL; |
160 | struct sock *sk; | |
161 | struct sk_buff *rep; | |
162 | unsigned int extra_len; | |
163 | ||
164 | if (req->udiag_ino == 0) | |
165 | goto out_nosk; | |
166 | ||
167 | sk = unix_lookup_by_ino(req->udiag_ino); | |
168 | err = -ENOENT; | |
169 | if (sk == NULL) | |
170 | goto out_nosk; | |
171 | ||
172 | err = sock_diag_check_cookie(sk, req->udiag_cookie); | |
173 | if (err) | |
174 | goto out; | |
175 | ||
176 | extra_len = 256; | |
177 | again: | |
178 | err = -ENOMEM; | |
179 | rep = alloc_skb(NLMSG_SPACE((sizeof(struct unix_diag_msg) + extra_len)), | |
180 | GFP_KERNEL); | |
181 | if (!rep) | |
182 | goto out; | |
183 | ||
184 | err = sk_diag_fill(sk, rep, req, NETLINK_CB(in_skb).pid, | |
185 | nlh->nlmsg_seq, 0, req->udiag_ino); | |
186 | if (err < 0) { | |
187 | kfree_skb(rep); | |
188 | extra_len += 256; | |
189 | if (extra_len >= PAGE_SIZE) | |
190 | goto out; | |
191 | ||
192 | goto again; | |
193 | } | |
194 | err = netlink_unicast(sock_diag_nlsk, rep, NETLINK_CB(in_skb).pid, | |
195 | MSG_DONTWAIT); | |
196 | if (err > 0) | |
197 | err = 0; | |
198 | out: | |
199 | if (sk) | |
200 | sock_put(sk); | |
201 | out_nosk: | |
202 | return err; | |
22931d3b PE |
203 | } |
204 | ||
205 | static int unix_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h) | |
206 | { | |
207 | int hdrlen = sizeof(struct unix_diag_req); | |
208 | ||
209 | if (nlmsg_len(h) < hdrlen) | |
210 | return -EINVAL; | |
211 | ||
212 | if (h->nlmsg_flags & NLM_F_DUMP) | |
213 | return netlink_dump_start(sock_diag_nlsk, skb, h, | |
214 | unix_diag_dump, NULL, 0); | |
215 | else | |
216 | return unix_diag_get_exact(skb, h, (struct unix_diag_req *)NLMSG_DATA(h)); | |
217 | } | |
218 | ||
219 | static struct sock_diag_handler unix_diag_handler = { | |
220 | .family = AF_UNIX, | |
221 | .dump = unix_diag_handler_dump, | |
222 | }; | |
223 | ||
224 | static int __init unix_diag_init(void) | |
225 | { | |
226 | return sock_diag_register(&unix_diag_handler); | |
227 | } | |
228 | ||
229 | static void __exit unix_diag_exit(void) | |
230 | { | |
231 | sock_diag_unregister(&unix_diag_handler); | |
232 | } | |
233 | ||
234 | module_init(unix_diag_init); | |
235 | module_exit(unix_diag_exit); | |
236 | MODULE_LICENSE("GPL"); | |
237 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 1 /* AF_LOCAL */); |