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Commit | Line | Data |
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eaaa3139 AV |
1 | #include <linux/module.h> |
2 | ||
3 | #include <net/sock.h> | |
4 | #include <linux/netlink.h> | |
5 | #include <linux/sock_diag.h> | |
6 | #include <linux/netlink_diag.h> | |
e341694e | 7 | #include <linux/rhashtable.h> |
eaaa3139 AV |
8 | |
9 | #include "af_netlink.h" | |
10 | ||
11 | static int sk_diag_dump_groups(struct sock *sk, struct sk_buff *nlskb) | |
12 | { | |
13 | struct netlink_sock *nlk = nlk_sk(sk); | |
14 | ||
15 | if (nlk->groups == NULL) | |
16 | return 0; | |
17 | ||
18 | return nla_put(nlskb, NETLINK_DIAG_GROUPS, NLGRPSZ(nlk->ngroups), | |
19 | nlk->groups); | |
20 | } | |
21 | ||
457c79e5 AV |
22 | static int sk_diag_put_flags(struct sock *sk, struct sk_buff *skb) |
23 | { | |
24 | struct netlink_sock *nlk = nlk_sk(sk); | |
25 | u32 flags = 0; | |
26 | ||
27 | if (nlk->cb_running) | |
28 | flags |= NDIAG_FLAG_CB_RUNNING; | |
29 | if (nlk->flags & NETLINK_F_RECV_PKTINFO) | |
30 | flags |= NDIAG_FLAG_PKTINFO; | |
31 | if (nlk->flags & NETLINK_F_BROADCAST_SEND_ERROR) | |
32 | flags |= NDIAG_FLAG_BROADCAST_ERROR; | |
33 | if (nlk->flags & NETLINK_F_RECV_NO_ENOBUFS) | |
34 | flags |= NDIAG_FLAG_NO_ENOBUFS; | |
35 | if (nlk->flags & NETLINK_F_LISTEN_ALL_NSID) | |
36 | flags |= NDIAG_FLAG_LISTEN_ALL_NSID; | |
37 | if (nlk->flags & NETLINK_F_CAP_ACK) | |
38 | flags |= NDIAG_FLAG_CAP_ACK; | |
39 | ||
40 | return nla_put_u32(skb, NETLINK_DIAG_FLAGS, flags); | |
41 | } | |
42 | ||
eaaa3139 AV |
43 | static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, |
44 | struct netlink_diag_req *req, | |
45 | u32 portid, u32 seq, u32 flags, int sk_ino) | |
46 | { | |
47 | struct nlmsghdr *nlh; | |
48 | struct netlink_diag_msg *rep; | |
49 | struct netlink_sock *nlk = nlk_sk(sk); | |
50 | ||
51 | nlh = nlmsg_put(skb, portid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rep), | |
52 | flags); | |
53 | if (!nlh) | |
54 | return -EMSGSIZE; | |
55 | ||
56 | rep = nlmsg_data(nlh); | |
57 | rep->ndiag_family = AF_NETLINK; | |
58 | rep->ndiag_type = sk->sk_type; | |
59 | rep->ndiag_protocol = sk->sk_protocol; | |
60 | rep->ndiag_state = sk->sk_state; | |
61 | ||
62 | rep->ndiag_ino = sk_ino; | |
63 | rep->ndiag_portid = nlk->portid; | |
64 | rep->ndiag_dst_portid = nlk->dst_portid; | |
65 | rep->ndiag_dst_group = nlk->dst_group; | |
66 | sock_diag_save_cookie(sk, rep->ndiag_cookie); | |
67 | ||
68 | if ((req->ndiag_show & NDIAG_SHOW_GROUPS) && | |
69 | sk_diag_dump_groups(sk, skb)) | |
70 | goto out_nlmsg_trim; | |
71 | ||
72 | if ((req->ndiag_show & NDIAG_SHOW_MEMINFO) && | |
73 | sock_diag_put_meminfo(sk, skb, NETLINK_DIAG_MEMINFO)) | |
74 | goto out_nlmsg_trim; | |
75 | ||
457c79e5 AV |
76 | if ((req->ndiag_show & NDIAG_SHOW_FLAGS) && |
77 | sk_diag_put_flags(sk, skb)) | |
78 | goto out_nlmsg_trim; | |
79 | ||
053c095a JB |
80 | nlmsg_end(skb, nlh); |
81 | return 0; | |
eaaa3139 AV |
82 | |
83 | out_nlmsg_trim: | |
84 | nlmsg_cancel(skb, nlh); | |
85 | return -EMSGSIZE; | |
86 | } | |
87 | ||
88 | static int __netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, | |
89 | int protocol, int s_num) | |
90 | { | |
ad202074 | 91 | struct rhashtable_iter *hti = (void *)cb->args[2]; |
eaaa3139 | 92 | struct netlink_table *tbl = &nl_table[protocol]; |
eaaa3139 AV |
93 | struct net *net = sock_net(skb->sk); |
94 | struct netlink_diag_req *req; | |
e341694e | 95 | struct netlink_sock *nlsk; |
eaaa3139 | 96 | struct sock *sk; |
ad202074 HX |
97 | int num = 2; |
98 | int ret = 0; | |
eaaa3139 AV |
99 | |
100 | req = nlmsg_data(cb->nlh); | |
101 | ||
ad202074 HX |
102 | if (s_num > 1) |
103 | goto mc_list; | |
88d6ed15 | 104 | |
ad202074 | 105 | num--; |
e341694e | 106 | |
ad202074 HX |
107 | if (!hti) { |
108 | hti = kmalloc(sizeof(*hti), GFP_KERNEL); | |
109 | if (!hti) | |
110 | return -ENOMEM; | |
111 | ||
112 | cb->args[2] = (long)hti; | |
113 | } | |
114 | ||
115 | if (!s_num) | |
116 | rhashtable_walk_enter(&tbl->hash, hti); | |
117 | ||
118 | ret = rhashtable_walk_start(hti); | |
119 | if (ret == -EAGAIN) | |
120 | ret = 0; | |
121 | if (ret) | |
122 | goto stop; | |
123 | ||
124 | while ((nlsk = rhashtable_walk_next(hti))) { | |
125 | if (IS_ERR(nlsk)) { | |
126 | ret = PTR_ERR(nlsk); | |
127 | if (ret == -EAGAIN) { | |
128 | ret = 0; | |
eaaa3139 AV |
129 | continue; |
130 | } | |
ad202074 HX |
131 | break; |
132 | } | |
eaaa3139 | 133 | |
ad202074 | 134 | sk = (struct sock *)nlsk; |
eaaa3139 | 135 | |
ad202074 HX |
136 | if (!net_eq(sock_net(sk), net)) |
137 | continue; | |
138 | ||
139 | if (sk_diag_fill(sk, skb, req, | |
140 | NETLINK_CB(cb->skb).portid, | |
141 | cb->nlh->nlmsg_seq, | |
142 | NLM_F_MULTI, | |
143 | sock_i_ino(sk)) < 0) { | |
144 | ret = 1; | |
145 | break; | |
eaaa3139 AV |
146 | } |
147 | } | |
148 | ||
ad202074 HX |
149 | stop: |
150 | rhashtable_walk_stop(hti); | |
151 | if (ret) | |
152 | goto done; | |
153 | ||
154 | rhashtable_walk_exit(hti); | |
ad202074 HX |
155 | num++; |
156 | ||
157 | mc_list: | |
158 | read_lock(&nl_table_lock); | |
eaaa3139 AV |
159 | sk_for_each_bound(sk, &tbl->mc_list) { |
160 | if (sk_hashed(sk)) | |
161 | continue; | |
162 | if (!net_eq(sock_net(sk), net)) | |
163 | continue; | |
164 | if (num < s_num) { | |
165 | num++; | |
166 | continue; | |
167 | } | |
168 | ||
169 | if (sk_diag_fill(sk, skb, req, | |
170 | NETLINK_CB(cb->skb).portid, | |
171 | cb->nlh->nlmsg_seq, | |
172 | NLM_F_MULTI, | |
173 | sock_i_ino(sk)) < 0) { | |
174 | ret = 1; | |
ad202074 | 175 | break; |
eaaa3139 AV |
176 | } |
177 | num++; | |
178 | } | |
ad202074 HX |
179 | read_unlock(&nl_table_lock); |
180 | ||
eaaa3139 AV |
181 | done: |
182 | cb->args[0] = num; | |
eaaa3139 AV |
183 | |
184 | return ret; | |
185 | } | |
186 | ||
187 | static int netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
188 | { | |
189 | struct netlink_diag_req *req; | |
190 | int s_num = cb->args[0]; | |
ad202074 | 191 | int err = 0; |
eaaa3139 AV |
192 | |
193 | req = nlmsg_data(cb->nlh); | |
194 | ||
eaaa3139 AV |
195 | if (req->sdiag_protocol == NDIAG_PROTO_ALL) { |
196 | int i; | |
197 | ||
198 | for (i = cb->args[1]; i < MAX_LINKS; i++) { | |
ad202074 HX |
199 | err = __netlink_diag_dump(skb, cb, i, s_num); |
200 | if (err) | |
eaaa3139 AV |
201 | break; |
202 | s_num = 0; | |
203 | } | |
ad202074 | 204 | cb->args[1] = i; |
eaaa3139 | 205 | } else { |
93636d1f | 206 | if (req->sdiag_protocol >= MAX_LINKS) |
eaaa3139 | 207 | return -ENOENT; |
eaaa3139 | 208 | |
ad202074 | 209 | err = __netlink_diag_dump(skb, cb, req->sdiag_protocol, s_num); |
eaaa3139 AV |
210 | } |
211 | ||
ad202074 HX |
212 | return err < 0 ? err : skb->len; |
213 | } | |
214 | ||
215 | static int netlink_diag_dump_done(struct netlink_callback *cb) | |
216 | { | |
217 | struct rhashtable_iter *hti = (void *)cb->args[2]; | |
218 | ||
219 | if (cb->args[0] == 1) | |
220 | rhashtable_walk_exit(hti); | |
eaaa3139 | 221 | |
ad202074 HX |
222 | kfree(hti); |
223 | ||
224 | return 0; | |
eaaa3139 AV |
225 | } |
226 | ||
227 | static int netlink_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h) | |
228 | { | |
229 | int hdrlen = sizeof(struct netlink_diag_req); | |
230 | struct net *net = sock_net(skb->sk); | |
231 | ||
232 | if (nlmsg_len(h) < hdrlen) | |
233 | return -EINVAL; | |
234 | ||
235 | if (h->nlmsg_flags & NLM_F_DUMP) { | |
236 | struct netlink_dump_control c = { | |
237 | .dump = netlink_diag_dump, | |
ad202074 | 238 | .done = netlink_diag_dump_done, |
eaaa3139 AV |
239 | }; |
240 | return netlink_dump_start(net->diag_nlsk, skb, h, &c); | |
241 | } else | |
242 | return -EOPNOTSUPP; | |
243 | } | |
244 | ||
245 | static const struct sock_diag_handler netlink_diag_handler = { | |
246 | .family = AF_NETLINK, | |
247 | .dump = netlink_diag_handler_dump, | |
248 | }; | |
249 | ||
250 | static int __init netlink_diag_init(void) | |
251 | { | |
252 | return sock_diag_register(&netlink_diag_handler); | |
253 | } | |
254 | ||
255 | static void __exit netlink_diag_exit(void) | |
256 | { | |
257 | sock_diag_unregister(&netlink_diag_handler); | |
258 | } | |
259 | ||
260 | module_init(netlink_diag_init); | |
261 | module_exit(netlink_diag_exit); | |
262 | MODULE_LICENSE("GPL"); | |
263 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 16 /* AF_NETLINK */); |