1// SPDX-License-Identifier: GPL-2.0-only
2#include <linux/module.h>
3
4#include <linux/inet_diag.h>
5#include <linux/sock_diag.h>
6
7#include <net/inet_sock.h>
8#include <net/raw.h>
9#include <net/rawv6.h>
10
11#ifdef pr_fmt
12# undef pr_fmt
13#endif
14
15#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
16
17static struct raw_hashinfo *
18raw_get_hashinfo(const struct inet_diag_req_v2 *r)
19{
20 if (r->sdiag_family == AF_INET) {
21 return &raw_v4_hashinfo;
22#if IS_ENABLED(CONFIG_IPV6)
23 } else if (r->sdiag_family == AF_INET6) {
24 return &raw_v6_hashinfo;
25#endif
26 } else {
27 return ERR_PTR(error: -EINVAL);
28 }
29}
30
31/*
32 * Due to requirement of not breaking user API we can't simply
33 * rename @pad field in inet_diag_req_v2 structure, instead
34 * use helper to figure it out.
35 */
36
37static bool raw_lookup(struct net *net, const struct sock *sk,
38 const struct inet_diag_req_v2 *req)
39{
40 struct inet_diag_req_raw *r = (void *)req;
41
42 if (r->sdiag_family == AF_INET)
43 return raw_v4_match(net, sk, num: r->sdiag_raw_protocol,
44 raddr: r->id.idiag_dst[0],
45 laddr: r->id.idiag_src[0],
46 dif: r->id.idiag_if, sdif: 0);
47#if IS_ENABLED(CONFIG_IPV6)
48 else
49 return raw_v6_match(net, sk, num: r->sdiag_raw_protocol,
50 loc_addr: (const struct in6_addr *)r->id.idiag_src,
51 rmt_addr: (const struct in6_addr *)r->id.idiag_dst,
52 dif: r->id.idiag_if, sdif: 0);
53#endif
54 return false;
55}
56
57static struct sock *raw_sock_get(struct net *net, const struct inet_diag_req_v2 *r)
58{
59 struct raw_hashinfo *hashinfo = raw_get_hashinfo(r);
60 struct hlist_head *hlist;
61 struct sock *sk;
62 int slot;
63
64 if (IS_ERR(ptr: hashinfo))
65 return ERR_CAST(ptr: hashinfo);
66
67 rcu_read_lock();
68 for (slot = 0; slot < RAW_HTABLE_SIZE; slot++) {
69 hlist = &hashinfo->ht[slot];
70 sk_for_each_rcu(sk, hlist) {
71 if (raw_lookup(net, sk, req: r)) {
72 /*
73 * Grab it and keep until we fill
74 * diag message to be reported, so
75 * caller should call sock_put then.
76 */
77 if (refcount_inc_not_zero(r: &sk->sk_refcnt))
78 goto out_unlock;
79 }
80 }
81 }
82 sk = ERR_PTR(error: -ENOENT);
83out_unlock:
84 rcu_read_unlock();
85
86 return sk;
87}
88
89static int raw_diag_dump_one(struct netlink_callback *cb,
90 const struct inet_diag_req_v2 *r)
91{
92 struct sk_buff *in_skb = cb->skb;
93 struct sk_buff *rep;
94 struct sock *sk;
95 struct net *net;
96 int err;
97
98 net = sock_net(sk: in_skb->sk);
99 sk = raw_sock_get(net, r);
100 if (IS_ERR(ptr: sk))
101 return PTR_ERR(ptr: sk);
102
103 rep = nlmsg_new(payload: nla_total_size(payload: sizeof(struct inet_diag_msg)) +
104 inet_diag_msg_attrs_size() +
105 nla_total_size(payload: sizeof(struct inet_diag_meminfo)) + 64,
106 GFP_KERNEL);
107 if (!rep) {
108 sock_put(sk);
109 return -ENOMEM;
110 }
111
112 err = inet_sk_diag_fill(sk, NULL, skb: rep, cb, req: r, nlmsg_flags: 0,
113 net_admin: netlink_net_capable(skb: in_skb, CAP_NET_ADMIN));
114 sock_put(sk);
115
116 if (err < 0) {
117 kfree_skb(skb: rep);
118 return err;
119 }
120
121 err = nlmsg_unicast(sk: net->diag_nlsk, skb: rep, NETLINK_CB(in_skb).portid);
122
123 return err;
124}
125
126static int sk_diag_dump(struct sock *sk, struct sk_buff *skb,
127 struct netlink_callback *cb,
128 const struct inet_diag_req_v2 *r,
129 bool net_admin)
130{
131 if (!inet_diag_bc_sk(cb_data: cb->data, sk))
132 return 0;
133
134 return inet_sk_diag_fill(sk, NULL, skb, cb, req: r, NLM_F_MULTI, net_admin);
135}
136
137static void raw_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
138 const struct inet_diag_req_v2 *r)
139{
140 bool net_admin = netlink_net_capable(skb: cb->skb, CAP_NET_ADMIN);
141 struct raw_hashinfo *hashinfo = raw_get_hashinfo(r);
142 struct net *net = sock_net(sk: skb->sk);
143 int num, s_num, slot, s_slot;
144 struct hlist_head *hlist;
145 struct sock *sk = NULL;
146
147 if (IS_ERR(ptr: hashinfo))
148 return;
149
150 s_slot = cb->args[0];
151 num = s_num = cb->args[1];
152
153 rcu_read_lock();
154 for (slot = s_slot; slot < RAW_HTABLE_SIZE; s_num = 0, slot++) {
155 num = 0;
156
157 hlist = &hashinfo->ht[slot];
158 sk_for_each_rcu(sk, hlist) {
159 struct inet_sock *inet = inet_sk(sk);
160
161 if (!net_eq(net1: sock_net(sk), net2: net))
162 continue;
163 if (num < s_num)
164 goto next;
165 if (sk->sk_family != r->sdiag_family)
166 goto next;
167 if (r->id.idiag_sport != inet->inet_sport &&
168 r->id.idiag_sport)
169 goto next;
170 if (r->id.idiag_dport != inet->inet_dport &&
171 r->id.idiag_dport)
172 goto next;
173 if (sk_diag_dump(sk, skb, cb, r, net_admin) < 0)
174 goto out_unlock;
175next:
176 num++;
177 }
178 }
179
180out_unlock:
181 rcu_read_unlock();
182
183 cb->args[0] = slot;
184 cb->args[1] = num;
185}
186
187static void raw_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
188 void *info)
189{
190 r->idiag_rqueue = sk_rmem_alloc_get(sk);
191 r->idiag_wqueue = sk_wmem_alloc_get(sk);
192}
193
194#ifdef CONFIG_INET_DIAG_DESTROY
195static int raw_diag_destroy(struct sk_buff *in_skb,
196 const struct inet_diag_req_v2 *r)
197{
198 struct net *net = sock_net(sk: in_skb->sk);
199 struct sock *sk;
200 int err;
201
202 sk = raw_sock_get(net, r);
203 if (IS_ERR(ptr: sk))
204 return PTR_ERR(ptr: sk);
205 err = sock_diag_destroy(sk, ECONNABORTED);
206 sock_put(sk);
207 return err;
208}
209#endif
210
211static const struct inet_diag_handler raw_diag_handler = {
212 .owner = THIS_MODULE,
213 .dump = raw_diag_dump,
214 .dump_one = raw_diag_dump_one,
215 .idiag_get_info = raw_diag_get_info,
216 .idiag_type = IPPROTO_RAW,
217 .idiag_info_size = 0,
218#ifdef CONFIG_INET_DIAG_DESTROY
219 .destroy = raw_diag_destroy,
220#endif
221};
222
223static void __always_unused __check_inet_diag_req_raw(void)
224{
225 /*
226 * Make sure the two structures are identical,
227 * except the @pad field.
228 */
229#define __offset_mismatch(m1, m2) \
230 (offsetof(struct inet_diag_req_v2, m1) != \
231 offsetof(struct inet_diag_req_raw, m2))
232
233 BUILD_BUG_ON(sizeof(struct inet_diag_req_v2) !=
234 sizeof(struct inet_diag_req_raw));
235 BUILD_BUG_ON(__offset_mismatch(sdiag_family, sdiag_family));
236 BUILD_BUG_ON(__offset_mismatch(sdiag_protocol, sdiag_protocol));
237 BUILD_BUG_ON(__offset_mismatch(idiag_ext, idiag_ext));
238 BUILD_BUG_ON(__offset_mismatch(pad, sdiag_raw_protocol));
239 BUILD_BUG_ON(__offset_mismatch(idiag_states, idiag_states));
240 BUILD_BUG_ON(__offset_mismatch(id, id));
241#undef __offset_mismatch
242}
243
244static int __init raw_diag_init(void)
245{
246 return inet_diag_register(handler: &raw_diag_handler);
247}
248
249static void __exit raw_diag_exit(void)
250{
251 inet_diag_unregister(handler: &raw_diag_handler);
252}
253
254module_init(raw_diag_init);
255module_exit(raw_diag_exit);
256MODULE_LICENSE("GPL");
257MODULE_DESCRIPTION("RAW socket monitoring via SOCK_DIAG");
258MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-255 /* AF_INET - IPPROTO_RAW */);
259MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10-255 /* AF_INET6 - IPPROTO_RAW */);
260

source code of linux/net/ipv4/raw_diag.c