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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 | ||
97a6ec4a | 118 | rhashtable_walk_start(hti); |
ad202074 HX |
119 | |
120 | while ((nlsk = rhashtable_walk_next(hti))) { | |
121 | if (IS_ERR(nlsk)) { | |
122 | ret = PTR_ERR(nlsk); | |
123 | if (ret == -EAGAIN) { | |
124 | ret = 0; | |
eaaa3139 AV |
125 | continue; |
126 | } | |
ad202074 HX |
127 | break; |
128 | } | |
eaaa3139 | 129 | |
ad202074 | 130 | sk = (struct sock *)nlsk; |
eaaa3139 | 131 | |
ad202074 HX |
132 | if (!net_eq(sock_net(sk), net)) |
133 | continue; | |
134 | ||
135 | if (sk_diag_fill(sk, skb, req, | |
136 | NETLINK_CB(cb->skb).portid, | |
137 | cb->nlh->nlmsg_seq, | |
138 | NLM_F_MULTI, | |
139 | sock_i_ino(sk)) < 0) { | |
140 | ret = 1; | |
141 | break; | |
eaaa3139 AV |
142 | } |
143 | } | |
144 | ||
ad202074 | 145 | rhashtable_walk_stop(hti); |
97a6ec4a | 146 | |
ad202074 HX |
147 | if (ret) |
148 | goto done; | |
149 | ||
150 | rhashtable_walk_exit(hti); | |
ad202074 HX |
151 | num++; |
152 | ||
153 | mc_list: | |
154 | read_lock(&nl_table_lock); | |
eaaa3139 AV |
155 | sk_for_each_bound(sk, &tbl->mc_list) { |
156 | if (sk_hashed(sk)) | |
157 | continue; | |
158 | if (!net_eq(sock_net(sk), net)) | |
159 | continue; | |
160 | if (num < s_num) { | |
161 | num++; | |
162 | continue; | |
163 | } | |
164 | ||
165 | if (sk_diag_fill(sk, skb, req, | |
166 | NETLINK_CB(cb->skb).portid, | |
167 | cb->nlh->nlmsg_seq, | |
168 | NLM_F_MULTI, | |
169 | sock_i_ino(sk)) < 0) { | |
170 | ret = 1; | |
ad202074 | 171 | break; |
eaaa3139 AV |
172 | } |
173 | num++; | |
174 | } | |
ad202074 HX |
175 | read_unlock(&nl_table_lock); |
176 | ||
eaaa3139 AV |
177 | done: |
178 | cb->args[0] = num; | |
eaaa3139 AV |
179 | |
180 | return ret; | |
181 | } | |
182 | ||
183 | static int netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
184 | { | |
185 | struct netlink_diag_req *req; | |
186 | int s_num = cb->args[0]; | |
ad202074 | 187 | int err = 0; |
eaaa3139 AV |
188 | |
189 | req = nlmsg_data(cb->nlh); | |
190 | ||
eaaa3139 AV |
191 | if (req->sdiag_protocol == NDIAG_PROTO_ALL) { |
192 | int i; | |
193 | ||
194 | for (i = cb->args[1]; i < MAX_LINKS; i++) { | |
ad202074 HX |
195 | err = __netlink_diag_dump(skb, cb, i, s_num); |
196 | if (err) | |
eaaa3139 AV |
197 | break; |
198 | s_num = 0; | |
199 | } | |
ad202074 | 200 | cb->args[1] = i; |
eaaa3139 | 201 | } else { |
93636d1f | 202 | if (req->sdiag_protocol >= MAX_LINKS) |
eaaa3139 | 203 | return -ENOENT; |
eaaa3139 | 204 | |
ad202074 | 205 | err = __netlink_diag_dump(skb, cb, req->sdiag_protocol, s_num); |
eaaa3139 AV |
206 | } |
207 | ||
ad202074 HX |
208 | return err < 0 ? err : skb->len; |
209 | } | |
210 | ||
211 | static int netlink_diag_dump_done(struct netlink_callback *cb) | |
212 | { | |
213 | struct rhashtable_iter *hti = (void *)cb->args[2]; | |
214 | ||
215 | if (cb->args[0] == 1) | |
216 | rhashtable_walk_exit(hti); | |
eaaa3139 | 217 | |
ad202074 HX |
218 | kfree(hti); |
219 | ||
220 | return 0; | |
eaaa3139 AV |
221 | } |
222 | ||
223 | static int netlink_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h) | |
224 | { | |
225 | int hdrlen = sizeof(struct netlink_diag_req); | |
226 | struct net *net = sock_net(skb->sk); | |
227 | ||
228 | if (nlmsg_len(h) < hdrlen) | |
229 | return -EINVAL; | |
230 | ||
231 | if (h->nlmsg_flags & NLM_F_DUMP) { | |
232 | struct netlink_dump_control c = { | |
233 | .dump = netlink_diag_dump, | |
ad202074 | 234 | .done = netlink_diag_dump_done, |
eaaa3139 AV |
235 | }; |
236 | return netlink_dump_start(net->diag_nlsk, skb, h, &c); | |
237 | } else | |
238 | return -EOPNOTSUPP; | |
239 | } | |
240 | ||
241 | static const struct sock_diag_handler netlink_diag_handler = { | |
242 | .family = AF_NETLINK, | |
243 | .dump = netlink_diag_handler_dump, | |
244 | }; | |
245 | ||
246 | static int __init netlink_diag_init(void) | |
247 | { | |
248 | return sock_diag_register(&netlink_diag_handler); | |
249 | } | |
250 | ||
251 | static void __exit netlink_diag_exit(void) | |
252 | { | |
253 | sock_diag_unregister(&netlink_diag_handler); | |
254 | } | |
255 | ||
256 | module_init(netlink_diag_init); | |
257 | module_exit(netlink_diag_exit); | |
258 | MODULE_LICENSE("GPL"); | |
259 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 16 /* AF_NETLINK */); |