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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 */); |
228 |
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Tags:
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