Merge tag 'tag-chrome-platform-fixes-for-v5.7-rc2' of git://git.kernel.org/pub/scm...
[linux-2.6-microblaze.git] / net / ipv4 / raw_diag.c
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 *
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
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
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
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
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
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
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
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
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
249 static int __init raw_diag_init(void)
250 {
251         return inet_diag_register(&raw_diag_handler);
252 }
253
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 */);