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