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
sk_diag_dump_groups(struct sock * sk,struct sk_buff * nlskb)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
sk_diag_fill(struct sock * sk,struct sk_buff * skb,struct netlink_diag_req * req,u32 portid,u32 seq,u32 flags,int sk_ino)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
55 return nlmsg_end(skb, nlh);
56
57 out_nlmsg_trim:
58 nlmsg_cancel(skb, nlh);
59 return -EMSGSIZE;
60 }
61
__netlink_diag_dump(struct sk_buff * skb,struct netlink_callback * cb,int protocol,int s_num)62 static int __netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
63 int protocol, int s_num)
64 {
65 struct netlink_table *tbl = &nl_table[protocol];
66 struct rhashtable *ht = &tbl->hash;
67 const struct bucket_table *htbl = rht_dereference(ht->tbl, ht);
68 struct net *net = sock_net(skb->sk);
69 struct netlink_diag_req *req;
70 struct netlink_sock *nlsk;
71 struct sock *sk;
72 int ret = 0, num = 0, i;
73
74 req = nlmsg_data(cb->nlh);
75
76 for (i = 0; i < htbl->size; i++) {
77 rht_for_each_entry(nlsk, htbl->buckets[i], ht, node) {
78 sk = (struct sock *)nlsk;
79
80 if (!net_eq(sock_net(sk), net))
81 continue;
82 if (num < s_num) {
83 num++;
84 continue;
85 }
86
87 if (sk_diag_fill(sk, skb, req,
88 NETLINK_CB(cb->skb).portid,
89 cb->nlh->nlmsg_seq,
90 NLM_F_MULTI,
91 sock_i_ino(sk)) < 0) {
92 ret = 1;
93 goto done;
94 }
95
96 num++;
97 }
98 }
99
100 sk_for_each_bound(sk, &tbl->mc_list) {
101 if (sk_hashed(sk))
102 continue;
103 if (!net_eq(sock_net(sk), net))
104 continue;
105 if (num < s_num) {
106 num++;
107 continue;
108 }
109
110 if (sk_diag_fill(sk, skb, req,
111 NETLINK_CB(cb->skb).portid,
112 cb->nlh->nlmsg_seq,
113 NLM_F_MULTI,
114 sock_i_ino(sk)) < 0) {
115 ret = 1;
116 goto done;
117 }
118 num++;
119 }
120 done:
121 cb->args[0] = num;
122 cb->args[1] = protocol;
123
124 return ret;
125 }
126
netlink_diag_dump(struct sk_buff * skb,struct netlink_callback * cb)127 static int netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
128 {
129 struct netlink_diag_req *req;
130 int s_num = cb->args[0];
131
132 req = nlmsg_data(cb->nlh);
133
134 mutex_lock(&nl_sk_hash_lock);
135 read_lock(&nl_table_lock);
136
137 if (req->sdiag_protocol == NDIAG_PROTO_ALL) {
138 int i;
139
140 for (i = cb->args[1]; i < MAX_LINKS; i++) {
141 if (__netlink_diag_dump(skb, cb, i, s_num))
142 break;
143 s_num = 0;
144 }
145 } else {
146 if (req->sdiag_protocol >= MAX_LINKS) {
147 read_unlock(&nl_table_lock);
148 mutex_unlock(&nl_sk_hash_lock);
149 return -ENOENT;
150 }
151
152 __netlink_diag_dump(skb, cb, req->sdiag_protocol, s_num);
153 }
154
155 read_unlock(&nl_table_lock);
156 mutex_unlock(&nl_sk_hash_lock);
157
158 return skb->len;
159 }
160
netlink_diag_handler_dump(struct sk_buff * skb,struct nlmsghdr * h)161 static int netlink_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
162 {
163 int hdrlen = sizeof(struct netlink_diag_req);
164 struct net *net = sock_net(skb->sk);
165
166 if (nlmsg_len(h) < hdrlen)
167 return -EINVAL;
168
169 if (h->nlmsg_flags & NLM_F_DUMP) {
170 struct netlink_dump_control c = {
171 .dump = netlink_diag_dump,
172 };
173 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
174 } else
175 return -EOPNOTSUPP;
176 }
177
178 static const struct sock_diag_handler netlink_diag_handler = {
179 .family = AF_NETLINK,
180 .dump = netlink_diag_handler_dump,
181 };
182
netlink_diag_init(void)183 static int __init netlink_diag_init(void)
184 {
185 return sock_diag_register(&netlink_diag_handler);
186 }
187
netlink_diag_exit(void)188 static void __exit netlink_diag_exit(void)
189 {
190 sock_diag_unregister(&netlink_diag_handler);
191 }
192
193 module_init(netlink_diag_init);
194 module_exit(netlink_diag_exit);
195 MODULE_LICENSE("GPL");
196 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 16 /* AF_NETLINK */);
197