blob: 8dd836a8dd60ce67c3b2b910f18f80f28cc05b7c [file] [log] [blame]
Andrey Vagineaaa3132013-03-21 20:33:48 +04001#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>
Thomas Grafe3416942014-08-02 11:47:45 +02007#include <linux/rhashtable.h>
Andrey Vagineaaa3132013-03-21 20:33:48 +04008
9#include "af_netlink.h"
10
11static 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
22static 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
Johannes Berg053c0952015-01-16 22:09:00 +010055 nlmsg_end(skb, nlh);
56 return 0;
Andrey Vagineaaa3132013-03-21 20:33:48 +040057
58out_nlmsg_trim:
59 nlmsg_cancel(skb, nlh);
60 return -EMSGSIZE;
61}
62
63static 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];
Thomas Grafe3416942014-08-02 11:47:45 +020067 struct rhashtable *ht = &tbl->hash;
Ying Xuec5adde92015-01-12 14:52:23 +080068 const struct bucket_table *htbl = rht_dereference_rcu(ht->tbl, ht);
Andrey Vagineaaa3132013-03-21 20:33:48 +040069 struct net *net = sock_net(skb->sk);
70 struct netlink_diag_req *req;
Thomas Grafe3416942014-08-02 11:47:45 +020071 struct netlink_sock *nlsk;
Andrey Vagineaaa3132013-03-21 20:33:48 +040072 struct sock *sk;
73 int ret = 0, num = 0, i;
74
75 req = nlmsg_data(cb->nlh);
76
Thomas Grafe3416942014-08-02 11:47:45 +020077 for (i = 0; i < htbl->size; i++) {
Thomas Graf88d6ed12015-01-02 23:00:16 +010078 struct rhash_head *pos;
79
Ying Xuec5adde92015-01-12 14:52:23 +080080 rht_for_each_entry_rcu(nlsk, pos, htbl, i, node) {
Thomas Grafe3416942014-08-02 11:47:45 +020081 sk = (struct sock *)nlsk;
82
Andrey Vagineaaa3132013-03-21 20:33:48 +040083 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 }
123done:
124 cb->args[0] = num;
125 cb->args[1] = protocol;
126
127 return ret;
128}
129
130static 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
Ying Xuec5adde92015-01-12 14:52:23 +0800137 rcu_read_lock();
Andrey Vagineaaa3132013-03-21 20:33:48 +0400138 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);
Ying Xuec5adde92015-01-12 14:52:23 +0800151 rcu_read_unlock();
Andrey Vagineaaa3132013-03-21 20:33:48 +0400152 return -ENOENT;
153 }
154
155 __netlink_diag_dump(skb, cb, req->sdiag_protocol, s_num);
156 }
157
158 read_unlock(&nl_table_lock);
Ying Xuec5adde92015-01-12 14:52:23 +0800159 rcu_read_unlock();
Andrey Vagineaaa3132013-03-21 20:33:48 +0400160
161 return skb->len;
162}
163
164static 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
181static const struct sock_diag_handler netlink_diag_handler = {
182 .family = AF_NETLINK,
183 .dump = netlink_diag_handler_dump,
184};
185
186static int __init netlink_diag_init(void)
187{
188 return sock_diag_register(&netlink_diag_handler);
189}
190
191static void __exit netlink_diag_exit(void)
192{
193 sock_diag_unregister(&netlink_diag_handler);
194}
195
196module_init(netlink_diag_init);
197module_exit(netlink_diag_exit);
198MODULE_LICENSE("GPL");
199MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 16 /* AF_NETLINK */);