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 | ||
45a96b9b PE |
13 | static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, struct unix_diag_req *req, |
14 | u32 pid, u32 seq, u32 flags, int sk_ino) | |
15 | { | |
16 | unsigned char *b = skb_tail_pointer(skb); | |
17 | struct nlmsghdr *nlh; | |
18 | struct unix_diag_msg *rep; | |
19 | ||
20 | nlh = NLMSG_PUT(skb, pid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rep)); | |
21 | nlh->nlmsg_flags = flags; | |
22 | ||
23 | rep = NLMSG_DATA(nlh); | |
24 | ||
25 | rep->udiag_family = AF_UNIX; | |
26 | rep->udiag_type = sk->sk_type; | |
27 | rep->udiag_state = sk->sk_state; | |
28 | rep->udiag_ino = sk_ino; | |
29 | sock_diag_save_cookie(sk, rep->udiag_cookie); | |
30 | ||
31 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; | |
32 | return skb->len; | |
33 | ||
34 | nlmsg_failure: | |
35 | nlmsg_trim(skb, b); | |
36 | return -EMSGSIZE; | |
37 | } | |
38 | ||
39 | static int sk_diag_dump(struct sock *sk, struct sk_buff *skb, struct unix_diag_req *req, | |
40 | u32 pid, u32 seq, u32 flags) | |
41 | { | |
42 | int sk_ino; | |
43 | ||
44 | unix_state_lock(sk); | |
45 | sk_ino = sock_i_ino(sk); | |
46 | unix_state_unlock(sk); | |
47 | ||
48 | if (!sk_ino) | |
49 | return 0; | |
50 | ||
51 | return sk_diag_fill(sk, skb, req, pid, seq, flags, sk_ino); | |
52 | } | |
53 | ||
22931d3b PE |
54 | static int unix_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) |
55 | { | |
45a96b9b PE |
56 | struct unix_diag_req *req; |
57 | int num, s_num, slot, s_slot; | |
58 | ||
59 | req = NLMSG_DATA(cb->nlh); | |
60 | ||
61 | s_slot = cb->args[0]; | |
62 | num = s_num = cb->args[1]; | |
63 | ||
64 | spin_lock(&unix_table_lock); | |
65 | for (slot = s_slot; slot <= UNIX_HASH_SIZE; s_num = 0, slot++) { | |
66 | struct sock *sk; | |
67 | struct hlist_node *node; | |
68 | ||
69 | num = 0; | |
70 | sk_for_each(sk, node, &unix_socket_table[slot]) { | |
71 | if (num < s_num) | |
72 | goto next; | |
73 | if (!(req->udiag_states & (1 << sk->sk_state))) | |
74 | goto next; | |
75 | if (sk_diag_dump(sk, skb, req, | |
76 | NETLINK_CB(cb->skb).pid, | |
77 | cb->nlh->nlmsg_seq, | |
78 | NLM_F_MULTI) < 0) | |
79 | goto done; | |
80 | next: | |
81 | num++; | |
82 | } | |
83 | } | |
84 | done: | |
85 | spin_unlock(&unix_table_lock); | |
86 | cb->args[0] = slot; | |
87 | cb->args[1] = num; | |
88 | ||
89 | return skb->len; | |
22931d3b PE |
90 | } |
91 | ||
5d3cae8b PE |
92 | static struct sock *unix_lookup_by_ino(int ino) |
93 | { | |
94 | int i; | |
95 | struct sock *sk; | |
96 | ||
97 | spin_lock(&unix_table_lock); | |
98 | for (i = 0; i <= UNIX_HASH_SIZE; i++) { | |
99 | struct hlist_node *node; | |
100 | ||
101 | sk_for_each(sk, node, &unix_socket_table[i]) | |
102 | if (ino == sock_i_ino(sk)) { | |
103 | sock_hold(sk); | |
104 | spin_unlock(&unix_table_lock); | |
105 | ||
106 | return sk; | |
107 | } | |
108 | } | |
109 | ||
110 | spin_unlock(&unix_table_lock); | |
111 | return NULL; | |
112 | } | |
113 | ||
22931d3b PE |
114 | static int unix_diag_get_exact(struct sk_buff *in_skb, |
115 | const struct nlmsghdr *nlh, | |
116 | struct unix_diag_req *req) | |
117 | { | |
5d3cae8b PE |
118 | int err = -EINVAL; |
119 | struct sock *sk; | |
120 | struct sk_buff *rep; | |
121 | unsigned int extra_len; | |
122 | ||
123 | if (req->udiag_ino == 0) | |
124 | goto out_nosk; | |
125 | ||
126 | sk = unix_lookup_by_ino(req->udiag_ino); | |
127 | err = -ENOENT; | |
128 | if (sk == NULL) | |
129 | goto out_nosk; | |
130 | ||
131 | err = sock_diag_check_cookie(sk, req->udiag_cookie); | |
132 | if (err) | |
133 | goto out; | |
134 | ||
135 | extra_len = 256; | |
136 | again: | |
137 | err = -ENOMEM; | |
138 | rep = alloc_skb(NLMSG_SPACE((sizeof(struct unix_diag_msg) + extra_len)), | |
139 | GFP_KERNEL); | |
140 | if (!rep) | |
141 | goto out; | |
142 | ||
143 | err = sk_diag_fill(sk, rep, req, NETLINK_CB(in_skb).pid, | |
144 | nlh->nlmsg_seq, 0, req->udiag_ino); | |
145 | if (err < 0) { | |
146 | kfree_skb(rep); | |
147 | extra_len += 256; | |
148 | if (extra_len >= PAGE_SIZE) | |
149 | goto out; | |
150 | ||
151 | goto again; | |
152 | } | |
153 | err = netlink_unicast(sock_diag_nlsk, rep, NETLINK_CB(in_skb).pid, | |
154 | MSG_DONTWAIT); | |
155 | if (err > 0) | |
156 | err = 0; | |
157 | out: | |
158 | if (sk) | |
159 | sock_put(sk); | |
160 | out_nosk: | |
161 | return err; | |
22931d3b PE |
162 | } |
163 | ||
164 | static int unix_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h) | |
165 | { | |
166 | int hdrlen = sizeof(struct unix_diag_req); | |
167 | ||
168 | if (nlmsg_len(h) < hdrlen) | |
169 | return -EINVAL; | |
170 | ||
171 | if (h->nlmsg_flags & NLM_F_DUMP) | |
172 | return netlink_dump_start(sock_diag_nlsk, skb, h, | |
173 | unix_diag_dump, NULL, 0); | |
174 | else | |
175 | return unix_diag_get_exact(skb, h, (struct unix_diag_req *)NLMSG_DATA(h)); | |
176 | } | |
177 | ||
178 | static struct sock_diag_handler unix_diag_handler = { | |
179 | .family = AF_UNIX, | |
180 | .dump = unix_diag_handler_dump, | |
181 | }; | |
182 | ||
183 | static int __init unix_diag_init(void) | |
184 | { | |
185 | return sock_diag_register(&unix_diag_handler); | |
186 | } | |
187 | ||
188 | static void __exit unix_diag_exit(void) | |
189 | { | |
190 | sock_diag_unregister(&unix_diag_handler); | |
191 | } | |
192 | ||
193 | module_init(unix_diag_init); | |
194 | module_exit(unix_diag_exit); | |
195 | MODULE_LICENSE("GPL"); | |
196 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 1 /* AF_LOCAL */); |