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>
7#include <linux/rhashtable.h>
8
9#include "af_netlink.h"
10
11#ifdef CONFIG_NETLINK_MMAP
12static int sk_diag_put_ring(struct netlink_ring *ring, int nl_type,
13 struct sk_buff *nlskb)
14{
15 struct netlink_diag_ring ndr;
16
17 ndr.ndr_block_size = ring->pg_vec_pages << PAGE_SHIFT;
18 ndr.ndr_block_nr = ring->pg_vec_len;
19 ndr.ndr_frame_size = ring->frame_size;
20 ndr.ndr_frame_nr = ring->frame_max + 1;
21
22 return nla_put(nlskb, nl_type, sizeof(ndr), &ndr);
23}
24
25static int sk_diag_put_rings_cfg(struct sock *sk, struct sk_buff *nlskb)
26{
27 struct netlink_sock *nlk = nlk_sk(sk);
28 int ret;
29
30 mutex_lock(&nlk->pg_vec_lock);
31 ret = sk_diag_put_ring(&nlk->rx_ring, NETLINK_DIAG_RX_RING, nlskb);
32 if (!ret)
33 ret = sk_diag_put_ring(&nlk->tx_ring, NETLINK_DIAG_TX_RING,
34 nlskb);
35 mutex_unlock(&nlk->pg_vec_lock);
36
37 return ret;
38}
39#else
40static int sk_diag_put_rings_cfg(struct sock *sk, struct sk_buff *nlskb)
41{
42 return 0;
43}
44#endif
45
46static int sk_diag_dump_groups(struct sock *sk, struct sk_buff *nlskb)
47{
48 struct netlink_sock *nlk = nlk_sk(sk);
49
50 if (nlk->groups == NULL)
51 return 0;
52
53 return nla_put(nlskb, NETLINK_DIAG_GROUPS, NLGRPSZ(nlk->ngroups),
54 nlk->groups);
55}
56
57static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
58 struct netlink_diag_req *req,
59 u32 portid, u32 seq, u32 flags, int sk_ino)
60{
61 struct nlmsghdr *nlh;
62 struct netlink_diag_msg *rep;
63 struct netlink_sock *nlk = nlk_sk(sk);
64
65 nlh = nlmsg_put(skb, portid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rep),
66 flags);
67 if (!nlh)
68 return -EMSGSIZE;
69
70 rep = nlmsg_data(nlh);
71 rep->ndiag_family = AF_NETLINK;
72 rep->ndiag_type = sk->sk_type;
73 rep->ndiag_protocol = sk->sk_protocol;
74 rep->ndiag_state = sk->sk_state;
75
76 rep->ndiag_ino = sk_ino;
77 rep->ndiag_portid = nlk->portid;
78 rep->ndiag_dst_portid = nlk->dst_portid;
79 rep->ndiag_dst_group = nlk->dst_group;
80 sock_diag_save_cookie(sk, rep->ndiag_cookie);
81
82 if ((req->ndiag_show & NDIAG_SHOW_GROUPS) &&
83 sk_diag_dump_groups(sk, skb))
84 goto out_nlmsg_trim;
85
86 if ((req->ndiag_show & NDIAG_SHOW_MEMINFO) &&
87 sock_diag_put_meminfo(sk, skb, NETLINK_DIAG_MEMINFO))
88 goto out_nlmsg_trim;
89
90 if ((req->ndiag_show & NDIAG_SHOW_RING_CFG) &&
91 sk_diag_put_rings_cfg(sk, skb))
92 goto out_nlmsg_trim;
93
94 nlmsg_end(skb, nlh);
95 return 0;
96
97out_nlmsg_trim:
98 nlmsg_cancel(skb, nlh);
99 return -EMSGSIZE;
100}
101
102static int __netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
103 int protocol, int s_num)
104{
105 struct netlink_table *tbl = &nl_table[protocol];
106 struct rhashtable *ht = &tbl->hash;
107 const struct bucket_table *htbl = rht_dereference_rcu(ht->tbl, ht);
108 struct net *net = sock_net(skb->sk);
109 struct netlink_diag_req *req;
110 struct netlink_sock *nlsk;
111 struct sock *sk;
112 int ret = 0, num = 0, i;
113
114 req = nlmsg_data(cb->nlh);
115
116 for (i = 0; i < htbl->size; i++) {
117 struct rhash_head *pos;
118
119 rht_for_each_entry_rcu(nlsk, pos, htbl, i, node) {
120 sk = (struct sock *)nlsk;
121
122 if (!net_eq(sock_net(sk), net))
123 continue;
124 if (num < s_num) {
125 num++;
126 continue;
127 }
128
129 if (sk_diag_fill(sk, skb, req,
130 NETLINK_CB(cb->skb).portid,
131 cb->nlh->nlmsg_seq,
132 NLM_F_MULTI,
133 sock_i_ino(sk)) < 0) {
134 ret = 1;
135 goto done;
136 }
137
138 num++;
139 }
140 }
141
142 sk_for_each_bound(sk, &tbl->mc_list) {
143 if (sk_hashed(sk))
144 continue;
145 if (!net_eq(sock_net(sk), net))
146 continue;
147 if (num < s_num) {
148 num++;
149 continue;
150 }
151
152 if (sk_diag_fill(sk, skb, req,
153 NETLINK_CB(cb->skb).portid,
154 cb->nlh->nlmsg_seq,
155 NLM_F_MULTI,
156 sock_i_ino(sk)) < 0) {
157 ret = 1;
158 goto done;
159 }
160 num++;
161 }
162done:
163 cb->args[0] = num;
164 cb->args[1] = protocol;
165
166 return ret;
167}
168
169static int netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
170{
171 struct netlink_diag_req *req;
172 int s_num = cb->args[0];
173
174 req = nlmsg_data(cb->nlh);
175
176 rcu_read_lock();
177 read_lock(&nl_table_lock);
178
179 if (req->sdiag_protocol == NDIAG_PROTO_ALL) {
180 int i;
181
182 for (i = cb->args[1]; i < MAX_LINKS; i++) {
183 if (__netlink_diag_dump(skb, cb, i, s_num))
184 break;
185 s_num = 0;
186 }
187 } else {
188 if (req->sdiag_protocol >= MAX_LINKS) {
189 read_unlock(&nl_table_lock);
190 rcu_read_unlock();
191 return -ENOENT;
192 }
193
194 __netlink_diag_dump(skb, cb, req->sdiag_protocol, s_num);
195 }
196
197 read_unlock(&nl_table_lock);
198 rcu_read_unlock();
199
200 return skb->len;
201}
202
203static int netlink_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
204{
205 int hdrlen = sizeof(struct netlink_diag_req);
206 struct net *net = sock_net(skb->sk);
207
208 if (nlmsg_len(h) < hdrlen)
209 return -EINVAL;
210
211 if (h->nlmsg_flags & NLM_F_DUMP) {
212 struct netlink_dump_control c = {
213 .dump = netlink_diag_dump,
214 };
215 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
216 } else
217 return -EOPNOTSUPP;
218}
219
220static const struct sock_diag_handler netlink_diag_handler = {
221 .family = AF_NETLINK,
222 .dump = netlink_diag_handler_dump,
223};
224
225static int __init netlink_diag_init(void)
226{
227 return sock_diag_register(&netlink_diag_handler);
228}
229
230static void __exit netlink_diag_exit(void)
231{
232 sock_diag_unregister(&netlink_diag_handler);
233}
234
235module_init(netlink_diag_init);
236module_exit(netlink_diag_exit);
237MODULE_LICENSE("GPL");
238MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 16
239
