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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 | ||
3dec2246 | 11 | #ifdef CONFIG_NETLINK_MMAP |
4ae9fbee PM |
12 | static 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 | ||
25 | static 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 | } | |
3dec2246 DM |
39 | #else |
40 | static int sk_diag_put_rings_cfg(struct sock *sk, struct sk_buff *nlskb) | |
41 | { | |
42 | return 0; | |
43 | } | |
44 | #endif | |
4ae9fbee | 45 | |
eaaa3139 AV |
46 | static 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 | ||
57 | static 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 | ||
4ae9fbee PM |
90 | if ((req->ndiag_show & NDIAG_SHOW_RING_CFG) && |
91 | sk_diag_put_rings_cfg(sk, skb)) | |
92 | goto out_nlmsg_trim; | |
93 | ||
eaaa3139 AV |
94 | return nlmsg_end(skb, nlh); |
95 | ||
96 | out_nlmsg_trim: | |
97 | nlmsg_cancel(skb, nlh); | |
98 | return -EMSGSIZE; | |
99 | } | |
100 | ||
101 | static 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]; | |
e341694e | 105 | struct rhashtable *ht = &tbl->hash; |
c5adde94 | 106 | const struct bucket_table *htbl = rht_dereference_rcu(ht->tbl, ht); |
eaaa3139 AV |
107 | struct net *net = sock_net(skb->sk); |
108 | struct netlink_diag_req *req; | |
e341694e | 109 | struct netlink_sock *nlsk; |
eaaa3139 AV |
110 | struct sock *sk; |
111 | int ret = 0, num = 0, i; | |
112 | ||
113 | req = nlmsg_data(cb->nlh); | |
114 | ||
e341694e | 115 | for (i = 0; i < htbl->size; i++) { |
88d6ed15 TG |
116 | struct rhash_head *pos; |
117 | ||
c5adde94 | 118 | rht_for_each_entry_rcu(nlsk, pos, htbl, i, node) { |
e341694e TG |
119 | sk = (struct sock *)nlsk; |
120 | ||
eaaa3139 AV |
121 | if (!net_eq(sock_net(sk), net)) |
122 | continue; | |
123 | if (num < s_num) { | |
124 | num++; | |
125 | continue; | |
126 | } | |
127 | ||
128 | if (sk_diag_fill(sk, skb, req, | |
129 | NETLINK_CB(cb->skb).portid, | |
130 | cb->nlh->nlmsg_seq, | |
131 | NLM_F_MULTI, | |
132 | sock_i_ino(sk)) < 0) { | |
133 | ret = 1; | |
134 | goto done; | |
135 | } | |
136 | ||
137 | num++; | |
138 | } | |
139 | } | |
140 | ||
141 | sk_for_each_bound(sk, &tbl->mc_list) { | |
142 | if (sk_hashed(sk)) | |
143 | continue; | |
144 | if (!net_eq(sock_net(sk), net)) | |
145 | continue; | |
146 | if (num < s_num) { | |
147 | num++; | |
148 | continue; | |
149 | } | |
150 | ||
151 | if (sk_diag_fill(sk, skb, req, | |
152 | NETLINK_CB(cb->skb).portid, | |
153 | cb->nlh->nlmsg_seq, | |
154 | NLM_F_MULTI, | |
155 | sock_i_ino(sk)) < 0) { | |
156 | ret = 1; | |
157 | goto done; | |
158 | } | |
159 | num++; | |
160 | } | |
161 | done: | |
162 | cb->args[0] = num; | |
163 | cb->args[1] = protocol; | |
164 | ||
165 | return ret; | |
166 | } | |
167 | ||
168 | static int netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
169 | { | |
170 | struct netlink_diag_req *req; | |
171 | int s_num = cb->args[0]; | |
172 | ||
173 | req = nlmsg_data(cb->nlh); | |
174 | ||
c5adde94 | 175 | rcu_read_lock(); |
eaaa3139 AV |
176 | read_lock(&nl_table_lock); |
177 | ||
178 | if (req->sdiag_protocol == NDIAG_PROTO_ALL) { | |
179 | int i; | |
180 | ||
181 | for (i = cb->args[1]; i < MAX_LINKS; i++) { | |
182 | if (__netlink_diag_dump(skb, cb, i, s_num)) | |
183 | break; | |
184 | s_num = 0; | |
185 | } | |
186 | } else { | |
187 | if (req->sdiag_protocol >= MAX_LINKS) { | |
188 | read_unlock(&nl_table_lock); | |
c5adde94 | 189 | rcu_read_unlock(); |
eaaa3139 AV |
190 | return -ENOENT; |
191 | } | |
192 | ||
193 | __netlink_diag_dump(skb, cb, req->sdiag_protocol, s_num); | |
194 | } | |
195 | ||
196 | read_unlock(&nl_table_lock); | |
c5adde94 | 197 | rcu_read_unlock(); |
eaaa3139 AV |
198 | |
199 | return skb->len; | |
200 | } | |
201 | ||
202 | static int netlink_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h) | |
203 | { | |
204 | int hdrlen = sizeof(struct netlink_diag_req); | |
205 | struct net *net = sock_net(skb->sk); | |
206 | ||
207 | if (nlmsg_len(h) < hdrlen) | |
208 | return -EINVAL; | |
209 | ||
210 | if (h->nlmsg_flags & NLM_F_DUMP) { | |
211 | struct netlink_dump_control c = { | |
212 | .dump = netlink_diag_dump, | |
213 | }; | |
214 | return netlink_dump_start(net->diag_nlsk, skb, h, &c); | |
215 | } else | |
216 | return -EOPNOTSUPP; | |
217 | } | |
218 | ||
219 | static const struct sock_diag_handler netlink_diag_handler = { | |
220 | .family = AF_NETLINK, | |
221 | .dump = netlink_diag_handler_dump, | |
222 | }; | |
223 | ||
224 | static int __init netlink_diag_init(void) | |
225 | { | |
226 | return sock_diag_register(&netlink_diag_handler); | |
227 | } | |
228 | ||
229 | static void __exit netlink_diag_exit(void) | |
230 | { | |
231 | sock_diag_unregister(&netlink_diag_handler); | |
232 | } | |
233 | ||
234 | module_init(netlink_diag_init); | |
235 | module_exit(netlink_diag_exit); | |
236 | MODULE_LICENSE("GPL"); | |
237 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 16 /* AF_NETLINK */); |