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 | ||
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 | { | |
66 | struct netlink_table *tbl = &nl_table[protocol]; | |
e341694e | 67 | struct rhashtable *ht = &tbl->hash; |
c5adde94 | 68 | const struct bucket_table *htbl = rht_dereference_rcu(ht->tbl, ht); |
eaaa3139 AV |
69 | struct net *net = sock_net(skb->sk); |
70 | struct netlink_diag_req *req; | |
e341694e | 71 | struct netlink_sock *nlsk; |
eaaa3139 AV |
72 | struct sock *sk; |
73 | int ret = 0, num = 0, i; | |
74 | ||
75 | req = nlmsg_data(cb->nlh); | |
76 | ||
e341694e | 77 | for (i = 0; i < htbl->size; i++) { |
88d6ed15 TG |
78 | struct rhash_head *pos; |
79 | ||
c5adde94 | 80 | rht_for_each_entry_rcu(nlsk, pos, htbl, i, node) { |
e341694e TG |
81 | sk = (struct sock *)nlsk; |
82 | ||
eaaa3139 AV |
83 | if (!net_eq(sock_net(sk), net)) |
84 | continue; | |
85 | if (num < s_num) { | |
86 | num++; | |
87 | continue; | |
88 | } | |
89 | ||
90 | if (sk_diag_fill(sk, skb, req, | |
91 | NETLINK_CB(cb->skb).portid, | |
92 | cb->nlh->nlmsg_seq, | |
93 | NLM_F_MULTI, | |
94 | sock_i_ino(sk)) < 0) { | |
95 | ret = 1; | |
96 | goto done; | |
97 | } | |
98 | ||
99 | num++; | |
100 | } | |
101 | } | |
102 | ||
103 | sk_for_each_bound(sk, &tbl->mc_list) { | |
104 | if (sk_hashed(sk)) | |
105 | continue; | |
106 | if (!net_eq(sock_net(sk), net)) | |
107 | continue; | |
108 | if (num < s_num) { | |
109 | num++; | |
110 | continue; | |
111 | } | |
112 | ||
113 | if (sk_diag_fill(sk, skb, req, | |
114 | NETLINK_CB(cb->skb).portid, | |
115 | cb->nlh->nlmsg_seq, | |
116 | NLM_F_MULTI, | |
117 | sock_i_ino(sk)) < 0) { | |
118 | ret = 1; | |
119 | goto done; | |
120 | } | |
121 | num++; | |
122 | } | |
123 | done: | |
124 | cb->args[0] = num; | |
125 | cb->args[1] = protocol; | |
126 | ||
127 | return ret; | |
128 | } | |
129 | ||
130 | static int netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
131 | { | |
132 | struct netlink_diag_req *req; | |
133 | int s_num = cb->args[0]; | |
134 | ||
135 | req = nlmsg_data(cb->nlh); | |
136 | ||
c5adde94 | 137 | rcu_read_lock(); |
eaaa3139 AV |
138 | read_lock(&nl_table_lock); |
139 | ||
140 | if (req->sdiag_protocol == NDIAG_PROTO_ALL) { | |
141 | int i; | |
142 | ||
143 | for (i = cb->args[1]; i < MAX_LINKS; i++) { | |
144 | if (__netlink_diag_dump(skb, cb, i, s_num)) | |
145 | break; | |
146 | s_num = 0; | |
147 | } | |
148 | } else { | |
149 | if (req->sdiag_protocol >= MAX_LINKS) { | |
150 | read_unlock(&nl_table_lock); | |
c5adde94 | 151 | rcu_read_unlock(); |
eaaa3139 AV |
152 | return -ENOENT; |
153 | } | |
154 | ||
155 | __netlink_diag_dump(skb, cb, req->sdiag_protocol, s_num); | |
156 | } | |
157 | ||
158 | read_unlock(&nl_table_lock); | |
c5adde94 | 159 | rcu_read_unlock(); |
eaaa3139 AV |
160 | |
161 | return skb->len; | |
162 | } | |
163 | ||
164 | static int netlink_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h) | |
165 | { | |
166 | int hdrlen = sizeof(struct netlink_diag_req); | |
167 | struct net *net = sock_net(skb->sk); | |
168 | ||
169 | if (nlmsg_len(h) < hdrlen) | |
170 | return -EINVAL; | |
171 | ||
172 | if (h->nlmsg_flags & NLM_F_DUMP) { | |
173 | struct netlink_dump_control c = { | |
174 | .dump = netlink_diag_dump, | |
175 | }; | |
176 | return netlink_dump_start(net->diag_nlsk, skb, h, &c); | |
177 | } else | |
178 | return -EOPNOTSUPP; | |
179 | } | |
180 | ||
181 | static const struct sock_diag_handler netlink_diag_handler = { | |
182 | .family = AF_NETLINK, | |
183 | .dump = netlink_diag_handler_dump, | |
184 | }; | |
185 | ||
186 | static int __init netlink_diag_init(void) | |
187 | { | |
188 | return sock_diag_register(&netlink_diag_handler); | |
189 | } | |
190 | ||
191 | static void __exit netlink_diag_exit(void) | |
192 | { | |
193 | sock_diag_unregister(&netlink_diag_handler); | |
194 | } | |
195 | ||
196 | module_init(netlink_diag_init); | |
197 | module_exit(netlink_diag_exit); | |
198 | MODULE_LICENSE("GPL"); | |
199 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 16 /* AF_NETLINK */); |