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 = nlmsg_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid);
123
124 return err;
125 }
126
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)127 static int sk_diag_dump(struct sock *sk, struct sk_buff *skb,
128 struct netlink_callback *cb,
129 const struct inet_diag_req_v2 *r,
130 struct nlattr *bc, bool net_admin)
131 {
132 if (!inet_diag_bc_sk(bc, sk))
133 return 0;
134
135 return inet_sk_diag_fill(sk, NULL, skb, cb, r, NLM_F_MULTI, net_admin);
136 }
137
raw_diag_dump(struct sk_buff * skb,struct netlink_callback * cb,const struct inet_diag_req_v2 * r)138 static void raw_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
139 const struct inet_diag_req_v2 *r)
140 {
141 bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
142 struct raw_hashinfo *hashinfo = raw_get_hashinfo(r);
143 struct net *net = sock_net(skb->sk);
144 struct inet_diag_dump_data *cb_data;
145 int num, s_num, slot, s_slot;
146 struct sock *sk = NULL;
147 struct nlattr *bc;
148
149 if (IS_ERR(hashinfo))
150 return;
151
152 cb_data = cb->data;
153 bc = cb_data->inet_diag_nla_bc;
154 s_slot = cb->args[0];
155 num = s_num = cb->args[1];
156
157 read_lock(&hashinfo->lock);
158 for (slot = s_slot; slot < RAW_HTABLE_SIZE; s_num = 0, slot++) {
159 num = 0;
160
161 sk_for_each(sk, &hashinfo->ht[slot]) {
162 struct inet_sock *inet = inet_sk(sk);
163
164 if (!net_eq(sock_net(sk), net))
165 continue;
166 if (num < s_num)
167 goto next;
168 if (sk->sk_family != r->sdiag_family)
169 goto next;
170 if (r->id.idiag_sport != inet->inet_sport &&
171 r->id.idiag_sport)
172 goto next;
173 if (r->id.idiag_dport != inet->inet_dport &&
174 r->id.idiag_dport)
175 goto next;
176 if (sk_diag_dump(sk, skb, cb, r, bc, net_admin) < 0)
177 goto out_unlock;
178 next:
179 num++;
180 }
181 }
182
183 out_unlock:
184 read_unlock(&hashinfo->lock);
185
186 cb->args[0] = slot;
187 cb->args[1] = num;
188 }
189
raw_diag_get_info(struct sock * sk,struct inet_diag_msg * r,void * info)190 static void raw_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
191 void *info)
192 {
193 r->idiag_rqueue = sk_rmem_alloc_get(sk);
194 r->idiag_wqueue = sk_wmem_alloc_get(sk);
195 }
196
197 #ifdef CONFIG_INET_DIAG_DESTROY
raw_diag_destroy(struct sk_buff * in_skb,const struct inet_diag_req_v2 * r)198 static int raw_diag_destroy(struct sk_buff *in_skb,
199 const struct inet_diag_req_v2 *r)
200 {
201 struct net *net = sock_net(in_skb->sk);
202 struct sock *sk;
203 int err;
204
205 sk = raw_sock_get(net, r);
206 if (IS_ERR(sk))
207 return PTR_ERR(sk);
208 err = sock_diag_destroy(sk, ECONNABORTED);
209 sock_put(sk);
210 return err;
211 }
212 #endif
213
214 static const struct inet_diag_handler raw_diag_handler = {
215 .dump = raw_diag_dump,
216 .dump_one = raw_diag_dump_one,
217 .idiag_get_info = raw_diag_get_info,
218 .idiag_type = IPPROTO_RAW,
219 .idiag_info_size = 0,
220 #ifdef CONFIG_INET_DIAG_DESTROY
221 .destroy = raw_diag_destroy,
222 #endif
223 };
224
__check_inet_diag_req_raw(void)225 static void __always_unused __check_inet_diag_req_raw(void)
226 {
227 /*
228 * Make sure the two structures are identical,
229 * except the @pad field.
230 */
231 #define __offset_mismatch(m1, m2) \
232 (offsetof(struct inet_diag_req_v2, m1) != \
233 offsetof(struct inet_diag_req_raw, m2))
234
235 BUILD_BUG_ON(sizeof(struct inet_diag_req_v2) !=
236 sizeof(struct inet_diag_req_raw));
237 BUILD_BUG_ON(__offset_mismatch(sdiag_family, sdiag_family));
238 BUILD_BUG_ON(__offset_mismatch(sdiag_protocol, sdiag_protocol));
239 BUILD_BUG_ON(__offset_mismatch(idiag_ext, idiag_ext));
240 BUILD_BUG_ON(__offset_mismatch(pad, sdiag_raw_protocol));
241 BUILD_BUG_ON(__offset_mismatch(idiag_states, idiag_states));
242 BUILD_BUG_ON(__offset_mismatch(id, id));
243 #undef __offset_mismatch
244 }
245
raw_diag_init(void)246 static int __init raw_diag_init(void)
247 {
248 return inet_diag_register(&raw_diag_handler);
249 }
250
raw_diag_exit(void)251 static void __exit raw_diag_exit(void)
252 {
253 inet_diag_unregister(&raw_diag_handler);
254 }
255
256 module_init(raw_diag_init);
257 module_exit(raw_diag_exit);
258 MODULE_LICENSE("GPL");
259 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-255 /* AF_INET - IPPROTO_RAW */);
260 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10-255 /* AF_INET6 - IPPROTO_RAW */);
261
