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
17 static struct raw_hashinfo *
raw_get_hashinfo(const struct inet_diag_req_v2 * r)18 raw_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(-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
raw_lookup(struct net * net,struct sock * from,const struct inet_diag_req_v2 * req)37 static struct sock *raw_lookup(struct net *net, struct sock *from,
38 const struct inet_diag_req_v2 *req)
39 {
40 struct inet_diag_req_raw *r = (void *)req;
41 struct sock *sk = NULL;
42
43 if (r->sdiag_family == AF_INET)
44 sk = __raw_v4_lookup(net, from, r->sdiag_raw_protocol,
45 r->id.idiag_dst[0],
46 r->id.idiag_src[0],
47 r->id.idiag_if, 0);
48 #if IS_ENABLED(CONFIG_IPV6)
49 else
50 sk = __raw_v6_lookup(net, from, r->sdiag_raw_protocol,
51 (const struct in6_addr *)r->id.idiag_src,
52 (const struct in6_addr *)r->id.idiag_dst,
53 r->id.idiag_if, 0);
54 #endif
55 return sk;
56 }
57
raw_sock_get(struct net * net,const struct inet_diag_req_v2 * r)58 static struct sock *raw_sock_get(struct net *net, const struct inet_diag_req_v2 *r)
59 {
60 struct raw_hashinfo *hashinfo = raw_get_hashinfo(r);
61 struct sock *sk = NULL, *s;
62 int slot;
63
64 if (IS_ERR(hashinfo))
65 return ERR_CAST(hashinfo);
66
67 read_lock(&hashinfo->lock);
68 for (slot = 0; slot < RAW_HTABLE_SIZE; slot++) {
69 sk_for_each(s, &hashinfo->ht[slot]) {
70 sk = raw_lookup(net, s, r);
71 if (sk) {
72 /*
73 * Grab it and keep until we fill
74 * diag meaage to be reported, so
75 * caller should call sock_put then.
76 * We can do that because we're keeping
77 * hashinfo->lock here.
78 */
79 sock_hold(sk);
80 goto out_unlock;
81 }
82 }
83 }
84 out_unlock:
85 read_unlock(&hashinfo->lock);
86
87 return sk ? sk : ERR_PTR(-ENOENT);
88 }
89
raw_diag_dump_one(struct netlink_callback * cb,const struct inet_diag_req_v2 * r)90 static int raw_diag_dump_one(struct netlink_callback *cb,
91 const struct inet_diag_req_v2 *r)
92 {
93 struct sk_buff *in_skb = cb->skb;
94 struct sk_buff *rep;
95 struct sock *sk;
96 struct net *net;
97 int err;
98
99 net = sock_net(in_skb->sk);
100 sk = raw_sock_get(net, r);
101 if (IS_ERR(sk))
102 return PTR_ERR(sk);
103
104 rep = nlmsg_new(nla_total_size(sizeof(struct inet_diag_msg)) +
105 inet_diag_msg_attrs_size() +
106 nla_total_size(sizeof(struct inet_diag_meminfo)) + 64,
107 GFP_KERNEL);
108 if (!rep) {
109 sock_put(sk);
110 return -ENOMEM;
111 }
112
113 err = inet_sk_diag_fill(sk, NULL, rep, cb, r, 0,
114 netlink_net_capable(in_skb, CAP_NET_ADMIN));
115 sock_put(sk);
116
117 if (err < 0) {
118 kfree_skb(rep);
119 return err;
120 }
121
122 err = netlink_unicast(net->diag_nlsk, rep,
123 NETLINK_CB(in_skb).portid,
124 MSG_DONTWAIT);
125 if (err > 0)
126 err = 0;
127 return err;
128 }
129
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)130 static int sk_diag_dump(struct sock *sk, struct sk_buff *skb,
131 struct netlink_callback *cb,
132 const struct inet_diag_req_v2 *r,
133 struct nlattr *bc, bool net_admin)
134 {
135 if (!inet_diag_bc_sk(bc, sk))
136 return 0;
137
138 return inet_sk_diag_fill(sk, NULL, skb, cb, r, NLM_F_MULTI, net_admin);
139 }
140
raw_diag_dump(struct sk_buff * skb,struct netlink_callback * cb,const struct inet_diag_req_v2 * r)141 static void raw_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
142 const struct inet_diag_req_v2 *r)
143 {
144 bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
145 struct raw_hashinfo *hashinfo = raw_get_hashinfo(r);
146 struct net *net = sock_net(skb->sk);
147 struct inet_diag_dump_data *cb_data;
148 int num, s_num, slot, s_slot;
149 struct sock *sk = NULL;
150 struct nlattr *bc;
151
152 if (IS_ERR(hashinfo))
153 return;
154
155 cb_data = cb->data;
156 bc = cb_data->inet_diag_nla_bc;
157 s_slot = cb->args[0];
158 num = s_num = cb->args[1];
159
160 read_lock(&hashinfo->lock);
161 for (slot = s_slot; slot < RAW_HTABLE_SIZE; s_num = 0, slot++) {
162 num = 0;
163
164 sk_for_each(sk, &hashinfo->ht[slot]) {
165 struct inet_sock *inet = inet_sk(sk);
166
167 if (!net_eq(sock_net(sk), net))
168 continue;
169 if (num < s_num)
170 goto next;
171 if (sk->sk_family != r->sdiag_family)
172 goto next;
173 if (r->id.idiag_sport != inet->inet_sport &&
174 r->id.idiag_sport)
175 goto next;
176 if (r->id.idiag_dport != inet->inet_dport &&
177 r->id.idiag_dport)
178 goto next;
179 if (sk_diag_dump(sk, skb, cb, r, bc, net_admin) < 0)
180 goto out_unlock;
181 next:
182 num++;
183 }
184 }
185
186 out_unlock:
187 read_unlock(&hashinfo->lock);
188
189 cb->args[0] = slot;
190 cb->args[1] = num;
191 }
192
raw_diag_get_info(struct sock * sk,struct inet_diag_msg * r,void * info)193 static void raw_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
194 void *info)
195 {
196 r->idiag_rqueue = sk_rmem_alloc_get(sk);
197 r->idiag_wqueue = sk_wmem_alloc_get(sk);
198 }
199
200 #ifdef CONFIG_INET_DIAG_DESTROY
raw_diag_destroy(struct sk_buff * in_skb,const struct inet_diag_req_v2 * r)201 static int raw_diag_destroy(struct sk_buff *in_skb,
202 const struct inet_diag_req_v2 *r)
203 {
204 struct net *net = sock_net(in_skb->sk);
205 struct sock *sk;
206 int err;
207
208 sk = raw_sock_get(net, r);
209 if (IS_ERR(sk))
210 return PTR_ERR(sk);
211 err = sock_diag_destroy(sk, ECONNABORTED);
212 sock_put(sk);
213 return err;
214 }
215 #endif
216
217 static const struct inet_diag_handler raw_diag_handler = {
218 .dump = raw_diag_dump,
219 .dump_one = raw_diag_dump_one,
220 .idiag_get_info = raw_diag_get_info,
221 .idiag_type = IPPROTO_RAW,
222 .idiag_info_size = 0,
223 #ifdef CONFIG_INET_DIAG_DESTROY
224 .destroy = raw_diag_destroy,
225 #endif
226 };
227
__check_inet_diag_req_raw(void)228 static void __always_unused __check_inet_diag_req_raw(void)
229 {
230 /*
231 * Make sure the two structures are identical,
232 * except the @pad field.
233 */
234 #define __offset_mismatch(m1, m2) \
235 (offsetof(struct inet_diag_req_v2, m1) != \
236 offsetof(struct inet_diag_req_raw, m2))
237
238 BUILD_BUG_ON(sizeof(struct inet_diag_req_v2) !=
239 sizeof(struct inet_diag_req_raw));
240 BUILD_BUG_ON(__offset_mismatch(sdiag_family, sdiag_family));
241 BUILD_BUG_ON(__offset_mismatch(sdiag_protocol, sdiag_protocol));
242 BUILD_BUG_ON(__offset_mismatch(idiag_ext, idiag_ext));
243 BUILD_BUG_ON(__offset_mismatch(pad, sdiag_raw_protocol));
244 BUILD_BUG_ON(__offset_mismatch(idiag_states, idiag_states));
245 BUILD_BUG_ON(__offset_mismatch(id, id));
246 #undef __offset_mismatch
247 }
248
raw_diag_init(void)249 static int __init raw_diag_init(void)
250 {
251 return inet_diag_register(&raw_diag_handler);
252 }
253
raw_diag_exit(void)254 static void __exit raw_diag_exit(void)
255 {
256 inet_diag_unregister(&raw_diag_handler);
257 }
258
259 module_init(raw_diag_init);
260 module_exit(raw_diag_exit);
261 MODULE_LICENSE("GPL");
262 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-255 /* AF_INET - IPPROTO_RAW */);
263 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10-255 /* AF_INET6 - IPPROTO_RAW */);
264