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 return nlmsg_end(skb, nlh);
95
96out_nlmsg_trim:
97 nlmsg_cancel(skb, nlh);
98 return -EMSGSIZE;
99}
100
101static int __netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
102 int protocol, int s_num)
103{
104 struct netlink_table *tbl = &nl_table[protocol];
105 struct rhashtable *ht = &tbl->hash;
106 const struct bucket_table *htbl = rht_dereference(ht->tbl, ht);
107 struct net *net = sock_net(skb->sk);
108 struct netlink_diag_req *req;
109 struct netlink_sock *nlsk;
110 struct sock *sk;
111 int ret = 0, num = 0, i;
112
113 req = nlmsg_data(cb->nlh);
114
115 for (i = 0; i < htbl->size; i++) {
116 rht_for_each_entry(nlsk, htbl->buckets[i], ht, node) {
117 sk = (struct sock *)nlsk;
118
119 if (!net_eq(sock_net(sk), net))
120 continue;
121 if (num < s_num) {
122 num++;
123 continue;
124 }
125
126 if (sk_diag_fill(sk, skb, req,
127 NETLINK_CB(cb->skb).portid,
128 cb->nlh->nlmsg_seq,
129 NLM_F_MULTI,
130 sock_i_ino(sk)) < 0) {
131 ret = 1;
132 goto done;
133 }
134
135 num++;
136 }
137 }
138
139 sk_for_each_bound(sk, &tbl->mc_list) {
140 if (sk_hashed(sk))
141 continue;
142 if (!net_eq(sock_net(sk), net))
143 continue;
144 if (num < s_num) {
145 num++;
146 continue;
147 }
148
149 if (sk_diag_fill(sk, skb, req,
150 NETLINK_CB(cb->skb).portid,
151 cb->nlh->nlmsg_seq,
152 NLM_F_MULTI,
153 sock_i_ino(sk)) < 0) {
154 ret = 1;
155 goto done;
156 }
157 num++;
158 }
159done:
160 cb->args[0] = num;
161 cb->args[1] = protocol;
162
163 return ret;
164}
165
166static int netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
167{
168 struct netlink_diag_req *req;
169 int s_num = cb->args[0];
170
171 req = nlmsg_data(cb->nlh);
172
173 mutex_lock(&nl_sk_hash_lock);
174 read_lock(&nl_table_lock);
175
176 if (req->sdiag_protocol == NDIAG_PROTO_ALL) {
177 int i;
178
179 for (i = cb->args[1]; i < MAX_LINKS; i++) {
180 if (__netlink_diag_dump(skb, cb, i, s_num))
181 break;
182 s_num = 0;
183 }
184 } else {
185 if (req->sdiag_protocol >= MAX_LINKS) {
186 read_unlock(&nl_table_lock);
187 mutex_unlock(&nl_sk_hash_lock);
188 return -ENOENT;
189 }
190
191 __netlink_diag_dump(skb, cb, req->sdiag_protocol, s_num);
192 }
193
194 read_unlock(&nl_table_lock);
195 mutex_unlock(&nl_sk_hash_lock);
196
197 return skb->len;
198}
199
200static int netlink_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
201{
202 int hdrlen = sizeof(struct netlink_diag_req);
203 struct net *net = sock_net(skb->sk);
204
205 if (nlmsg_len(h) < hdrlen)
206 return -EINVAL;
207
208 if (h->nlmsg_flags & NLM_F_DUMP) {
209 struct netlink_dump_control c = {
210 .dump = netlink_diag_dump,
211 };
212 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
213 } else
214 return -EOPNOTSUPP;
215}
216
217static const struct sock_diag_handler netlink_diag_handler = {
218 .family = AF_NETLINK,
219 .dump = netlink_diag_handler_dump,
220};
221
222static int __init netlink_diag_init(void)
223{
224 return sock_diag_register(&netlink_diag_handler);
225}
226
227static void __exit netlink_diag_exit(void)
228{
229 sock_diag_unregister(&netlink_diag_handler);
230}
231
232module_init(netlink_diag_init);
233module_exit(netlink_diag_exit);
234MODULE_LICENSE("GPL");
235MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 16
236
