1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
|
// SPDX-License-Identifier: GPL-2.0-only
#include <linux/module.h>
#include <linux/inet_diag.h>
#include <linux/sock_diag.h>
#include <net/inet_sock.h>
#include <net/raw.h>
#include <net/rawv6.h>
#ifdef pr_fmt
# undef pr_fmt
#endif
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
static struct raw_hashinfo *
raw_get_hashinfo(const struct inet_diag_req_v2 *r)
{
if (r->sdiag_family == AF_INET) {
return &raw_v4_hashinfo;
#if IS_ENABLED(CONFIG_IPV6)
} else if (r->sdiag_family == AF_INET6) {
return &raw_v6_hashinfo;
#endif
} else {
return ERR_PTR(-EINVAL);
}
}
/*
* Due to requirement of not breaking user API we can't simply
* rename @pad field in inet_diag_req_v2 structure, instead
* use helper to figure it out.
*/
static bool raw_lookup(struct net *net, struct sock *sk,
const struct inet_diag_req_v2 *req)
{
struct inet_diag_req_raw *r = (void *)req;
if (r->sdiag_family == AF_INET)
return raw_v4_match(net, sk, r->sdiag_raw_protocol,
r->id.idiag_dst[0],
r->id.idiag_src[0],
r->id.idiag_if, 0);
#if IS_ENABLED(CONFIG_IPV6)
else
return raw_v6_match(net, sk, r->sdiag_raw_protocol,
(const struct in6_addr *)r->id.idiag_src,
(const struct in6_addr *)r->id.idiag_dst,
r->id.idiag_if, 0);
#endif
return false;
}
static struct sock *raw_sock_get(struct net *net, const struct inet_diag_req_v2 *r)
{
struct raw_hashinfo *hashinfo = raw_get_hashinfo(r);
struct hlist_nulls_head *hlist;
struct hlist_nulls_node *hnode;
struct sock *sk;
int slot;
if (IS_ERR(hashinfo))
return ERR_CAST(hashinfo);
rcu_read_lock();
for (slot = 0; slot < RAW_HTABLE_SIZE; slot++) {
hlist = &hashinfo->ht[slot];
sk_nulls_for_each(sk, hnode, hlist) {
if (raw_lookup(net, sk, r)) {
/*
* Grab it and keep until we fill
* diag message to be reported, so
* caller should call sock_put then.
*/
if (refcount_inc_not_zero(&sk->sk_refcnt))
goto out_unlock;
}
}
}
sk = ERR_PTR(-ENOENT);
out_unlock:
rcu_read_unlock();
return sk;
}
static int raw_diag_dump_one(struct netlink_callback *cb,
const struct inet_diag_req_v2 *r)
{
struct sk_buff *in_skb = cb->skb;
struct sk_buff *rep;
struct sock *sk;
struct net *net;
int err;
net = sock_net(in_skb->sk);
sk = raw_sock_get(net, r);
if (IS_ERR(sk))
return PTR_ERR(sk);
rep = nlmsg_new(nla_total_size(sizeof(struct inet_diag_msg)) +
inet_diag_msg_attrs_size() +
nla_total_size(sizeof(struct inet_diag_meminfo)) + 64,
GFP_KERNEL);
if (!rep) {
sock_put(sk);
return -ENOMEM;
}
err = inet_sk_diag_fill(sk, NULL, rep, cb, r, 0,
netlink_net_capable(in_skb, CAP_NET_ADMIN));
sock_put(sk);
if (err < 0) {
kfree_skb(rep);
return err;
}
err = nlmsg_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid);
return err;
}
static int sk_diag_dump(struct sock *sk, struct sk_buff *skb,
struct netlink_callback *cb,
const struct inet_diag_req_v2 *r,
struct nlattr *bc, bool net_admin)
{
if (!inet_diag_bc_sk(bc, sk))
return 0;
return inet_sk_diag_fill(sk, NULL, skb, cb, r, NLM_F_MULTI, net_admin);
}
static void raw_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
const struct inet_diag_req_v2 *r)
{
bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
struct raw_hashinfo *hashinfo = raw_get_hashinfo(r);
struct net *net = sock_net(skb->sk);
struct inet_diag_dump_data *cb_data;
struct hlist_nulls_head *hlist;
struct hlist_nulls_node *hnode;
int num, s_num, slot, s_slot;
struct sock *sk = NULL;
struct nlattr *bc;
if (IS_ERR(hashinfo))
return;
cb_data = cb->data;
bc = cb_data->inet_diag_nla_bc;
s_slot = cb->args[0];
num = s_num = cb->args[1];
rcu_read_lock();
for (slot = s_slot; slot < RAW_HTABLE_SIZE; s_num = 0, slot++) {
num = 0;
hlist = &hashinfo->ht[slot];
sk_nulls_for_each(sk, hnode, hlist) {
struct inet_sock *inet = inet_sk(sk);
if (!net_eq(sock_net(sk), net))
continue;
if (num < s_num)
goto next;
if (sk->sk_family != r->sdiag_family)
goto next;
if (r->id.idiag_sport != inet->inet_sport &&
r->id.idiag_sport)
goto next;
if (r->id.idiag_dport != inet->inet_dport &&
r->id.idiag_dport)
goto next;
if (sk_diag_dump(sk, skb, cb, r, bc, net_admin) < 0)
goto out_unlock;
next:
num++;
}
}
out_unlock:
rcu_read_unlock();
cb->args[0] = slot;
cb->args[1] = num;
}
static void raw_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
void *info)
{
r->idiag_rqueue = sk_rmem_alloc_get(sk);
r->idiag_wqueue = sk_wmem_alloc_get(sk);
}
#ifdef CONFIG_INET_DIAG_DESTROY
static int raw_diag_destroy(struct sk_buff *in_skb,
const struct inet_diag_req_v2 *r)
{
struct net *net = sock_net(in_skb->sk);
struct sock *sk;
int err;
sk = raw_sock_get(net, r);
if (IS_ERR(sk))
return PTR_ERR(sk);
err = sock_diag_destroy(sk, ECONNABORTED);
sock_put(sk);
return err;
}
#endif
static const struct inet_diag_handler raw_diag_handler = {
.dump = raw_diag_dump,
.dump_one = raw_diag_dump_one,
.idiag_get_info = raw_diag_get_info,
.idiag_type = IPPROTO_RAW,
.idiag_info_size = 0,
#ifdef CONFIG_INET_DIAG_DESTROY
.destroy = raw_diag_destroy,
#endif
};
static void __always_unused __check_inet_diag_req_raw(void)
{
/*
* Make sure the two structures are identical,
* except the @pad field.
*/
#define __offset_mismatch(m1, m2) \
(offsetof(struct inet_diag_req_v2, m1) != \
offsetof(struct inet_diag_req_raw, m2))
BUILD_BUG_ON(sizeof(struct inet_diag_req_v2) !=
sizeof(struct inet_diag_req_raw));
BUILD_BUG_ON(__offset_mismatch(sdiag_family, sdiag_family));
BUILD_BUG_ON(__offset_mismatch(sdiag_protocol, sdiag_protocol));
BUILD_BUG_ON(__offset_mismatch(idiag_ext, idiag_ext));
BUILD_BUG_ON(__offset_mismatch(pad, sdiag_raw_protocol));
BUILD_BUG_ON(__offset_mismatch(idiag_states, idiag_states));
BUILD_BUG_ON(__offset_mismatch(id, id));
#undef __offset_mismatch
}
static int __init raw_diag_init(void)
{
return inet_diag_register(&raw_diag_handler);
}
static void __exit raw_diag_exit(void)
{
inet_diag_unregister(&raw_diag_handler);
}
module_init(raw_diag_init);
module_exit(raw_diag_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-255 /* AF_INET - IPPROTO_RAW */);
MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10-255 /* AF_INET6 - IPPROTO_RAW */);
|
