Commit | Line | Data |
---|---|---|
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 | ||
22 | static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, | |
23 | struct netlink_diag_req *req, | |
24 | u32 portid, u32 seq, u32 flags, int sk_ino) | |
25 | { | |
26 | struct nlmsghdr *nlh; | |
27 | struct netlink_diag_msg *rep; | |
28 | struct netlink_sock *nlk = nlk_sk(sk); | |
29 | ||
30 | nlh = nlmsg_put(skb, portid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rep), | |
31 | flags); | |
32 | if (!nlh) | |
33 | return -EMSGSIZE; | |
34 | ||
35 | rep = nlmsg_data(nlh); | |
36 | rep->ndiag_family = AF_NETLINK; | |
37 | rep->ndiag_type = sk->sk_type; | |
38 | rep->ndiag_protocol = sk->sk_protocol; | |
39 | rep->ndiag_state = sk->sk_state; | |
40 | ||
41 | rep->ndiag_ino = sk_ino; | |
42 | rep->ndiag_portid = nlk->portid; | |
43 | rep->ndiag_dst_portid = nlk->dst_portid; | |
44 | rep->ndiag_dst_group = nlk->dst_group; | |
45 | sock_diag_save_cookie(sk, rep->ndiag_cookie); | |
46 | ||
47 | if ((req->ndiag_show & NDIAG_SHOW_GROUPS) && | |
48 | sk_diag_dump_groups(sk, skb)) | |
49 | goto out_nlmsg_trim; | |
50 | ||
51 | if ((req->ndiag_show & NDIAG_SHOW_MEMINFO) && | |
52 | sock_diag_put_meminfo(sk, skb, NETLINK_DIAG_MEMINFO)) | |
53 | goto out_nlmsg_trim; | |
54 | ||
053c095a JB |
55 | nlmsg_end(skb, nlh); |
56 | return 0; | |
eaaa3139 AV |
57 | |
58 | out_nlmsg_trim: | |
59 | nlmsg_cancel(skb, nlh); | |
60 | return -EMSGSIZE; | |
61 | } | |
62 | ||
63 | static int __netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, | |
64 | int protocol, int s_num) | |
65 | { | |
ad202074 | 66 | struct rhashtable_iter *hti = (void *)cb->args[2]; |
eaaa3139 | 67 | struct netlink_table *tbl = &nl_table[protocol]; |
eaaa3139 AV |
68 | struct net *net = sock_net(skb->sk); |
69 | struct netlink_diag_req *req; | |
e341694e | 70 | struct netlink_sock *nlsk; |
eaaa3139 | 71 | struct sock *sk; |
ad202074 HX |
72 | int num = 2; |
73 | int ret = 0; | |
eaaa3139 AV |
74 | |
75 | req = nlmsg_data(cb->nlh); | |
76 | ||
ad202074 HX |
77 | if (s_num > 1) |
78 | goto mc_list; | |
88d6ed15 | 79 | |
ad202074 | 80 | num--; |
e341694e | 81 | |
ad202074 HX |
82 | if (!hti) { |
83 | hti = kmalloc(sizeof(*hti), GFP_KERNEL); | |
84 | if (!hti) | |
85 | return -ENOMEM; | |
86 | ||
87 | cb->args[2] = (long)hti; | |
88 | } | |
89 | ||
90 | if (!s_num) | |
91 | rhashtable_walk_enter(&tbl->hash, hti); | |
92 | ||
93 | ret = rhashtable_walk_start(hti); | |
94 | if (ret == -EAGAIN) | |
95 | ret = 0; | |
96 | if (ret) | |
97 | goto stop; | |
98 | ||
99 | while ((nlsk = rhashtable_walk_next(hti))) { | |
100 | if (IS_ERR(nlsk)) { | |
101 | ret = PTR_ERR(nlsk); | |
102 | if (ret == -EAGAIN) { | |
103 | ret = 0; | |
eaaa3139 AV |
104 | continue; |
105 | } | |
ad202074 HX |
106 | break; |
107 | } | |
eaaa3139 | 108 | |
ad202074 | 109 | sk = (struct sock *)nlsk; |
eaaa3139 | 110 | |
ad202074 HX |
111 | if (!net_eq(sock_net(sk), net)) |
112 | continue; | |
113 | ||
114 | if (sk_diag_fill(sk, skb, req, | |
115 | NETLINK_CB(cb->skb).portid, | |
116 | cb->nlh->nlmsg_seq, | |
117 | NLM_F_MULTI, | |
118 | sock_i_ino(sk)) < 0) { | |
119 | ret = 1; | |
120 | break; | |
eaaa3139 AV |
121 | } |
122 | } | |
123 | ||
ad202074 HX |
124 | stop: |
125 | rhashtable_walk_stop(hti); | |
126 | if (ret) | |
127 | goto done; | |
128 | ||
129 | rhashtable_walk_exit(hti); | |
ad202074 HX |
130 | num++; |
131 | ||
132 | mc_list: | |
133 | read_lock(&nl_table_lock); | |
eaaa3139 AV |
134 | sk_for_each_bound(sk, &tbl->mc_list) { |
135 | if (sk_hashed(sk)) | |
136 | continue; | |
137 | if (!net_eq(sock_net(sk), net)) | |
138 | continue; | |
139 | if (num < s_num) { | |
140 | num++; | |
141 | continue; | |
142 | } | |
143 | ||
144 | if (sk_diag_fill(sk, skb, req, | |
145 | NETLINK_CB(cb->skb).portid, | |
146 | cb->nlh->nlmsg_seq, | |
147 | NLM_F_MULTI, | |
148 | sock_i_ino(sk)) < 0) { | |
149 | ret = 1; | |
ad202074 | 150 | break; |
eaaa3139 AV |
151 | } |
152 | num++; | |
153 | } | |
ad202074 HX |
154 | read_unlock(&nl_table_lock); |
155 | ||
eaaa3139 AV |
156 | done: |
157 | cb->args[0] = num; | |
eaaa3139 AV |
158 | |
159 | return ret; | |
160 | } | |
161 | ||
162 | static int netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
163 | { | |
164 | struct netlink_diag_req *req; | |
165 | int s_num = cb->args[0]; | |
ad202074 | 166 | int err = 0; |
eaaa3139 AV |
167 | |
168 | req = nlmsg_data(cb->nlh); | |
169 | ||
eaaa3139 AV |
170 | if (req->sdiag_protocol == NDIAG_PROTO_ALL) { |
171 | int i; | |
172 | ||
173 | for (i = cb->args[1]; i < MAX_LINKS; i++) { | |
ad202074 HX |
174 | err = __netlink_diag_dump(skb, cb, i, s_num); |
175 | if (err) | |
eaaa3139 AV |
176 | break; |
177 | s_num = 0; | |
178 | } | |
ad202074 | 179 | cb->args[1] = i; |
eaaa3139 AV |
180 | } else { |
181 | if (req->sdiag_protocol >= MAX_LINKS) { | |
182 | read_unlock(&nl_table_lock); | |
c5adde94 | 183 | rcu_read_unlock(); |
eaaa3139 AV |
184 | return -ENOENT; |
185 | } | |
186 | ||
ad202074 | 187 | err = __netlink_diag_dump(skb, cb, req->sdiag_protocol, s_num); |
eaaa3139 AV |
188 | } |
189 | ||
ad202074 HX |
190 | return err < 0 ? err : skb->len; |
191 | } | |
192 | ||
193 | static int netlink_diag_dump_done(struct netlink_callback *cb) | |
194 | { | |
195 | struct rhashtable_iter *hti = (void *)cb->args[2]; | |
196 | ||
197 | if (cb->args[0] == 1) | |
198 | rhashtable_walk_exit(hti); | |
eaaa3139 | 199 | |
ad202074 HX |
200 | kfree(hti); |
201 | ||
202 | return 0; | |
eaaa3139 AV |
203 | } |
204 | ||
205 | static int netlink_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h) | |
206 | { | |
207 | int hdrlen = sizeof(struct netlink_diag_req); | |
208 | struct net *net = sock_net(skb->sk); | |
209 | ||
210 | if (nlmsg_len(h) < hdrlen) | |
211 | return -EINVAL; | |
212 | ||
213 | if (h->nlmsg_flags & NLM_F_DUMP) { | |
214 | struct netlink_dump_control c = { | |
215 | .dump = netlink_diag_dump, | |
ad202074 | 216 | .done = netlink_diag_dump_done, |
eaaa3139 AV |
217 | }; |
218 | return netlink_dump_start(net->diag_nlsk, skb, h, &c); | |
219 | } else | |
220 | return -EOPNOTSUPP; | |
221 | } | |
222 | ||
223 | static const struct sock_diag_handler netlink_diag_handler = { | |
224 | .family = AF_NETLINK, | |
225 | .dump = netlink_diag_handler_dump, | |
226 | }; | |
227 | ||
228 | static int __init netlink_diag_init(void) | |
229 | { | |
230 | return sock_diag_register(&netlink_diag_handler); | |
231 | } | |
232 | ||
233 | static void __exit netlink_diag_exit(void) | |
234 | { | |
235 | sock_diag_unregister(&netlink_diag_handler); | |
236 | } | |
237 | ||
238 | module_init(netlink_diag_init); | |
239 | module_exit(netlink_diag_exit); | |
240 | MODULE_LICENSE("GPL"); | |
241 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 16 /* AF_NETLINK */); |