1 // SPDX-License-Identifier: GPL-2.0-only
2 #include <linux/module.h>
4 #include <linux/inet_diag.h>
5 #include <linux/sock_diag.h>
7 #include <net/inet_sock.h>
15 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
17 static struct raw_hashinfo *
18 raw_get_hashinfo(const struct inet_diag_req_v2 *r)
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;
27 return ERR_PTR(-EINVAL);
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.
37 static struct sock *raw_lookup(struct net *net, struct sock *from,
38 const struct inet_diag_req_v2 *req)
40 struct inet_diag_req_raw *r = (void *)req;
41 struct sock *sk = NULL;
43 if (r->sdiag_family == AF_INET)
44 sk = __raw_v4_lookup(net, from, r->sdiag_raw_protocol,
48 #if IS_ENABLED(CONFIG_IPV6)
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,
58 static struct sock *raw_sock_get(struct net *net, const struct inet_diag_req_v2 *r)
60 struct raw_hashinfo *hashinfo = raw_get_hashinfo(r);
61 struct sock *sk = NULL, *s;
65 return ERR_CAST(hashinfo);
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);
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.
85 read_unlock(&hashinfo->lock);
87 return sk ? sk : ERR_PTR(-ENOENT);
90 static int raw_diag_dump_one(struct netlink_callback *cb,
91 const struct inet_diag_req_v2 *r)
93 struct sk_buff *in_skb = cb->skb;
99 net = sock_net(in_skb->sk);
100 sk = raw_sock_get(net, r);
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,
113 err = inet_sk_diag_fill(sk, NULL, rep, cb, r, 0,
114 netlink_net_capable(in_skb, CAP_NET_ADMIN));
122 err = netlink_unicast(net->diag_nlsk, rep,
123 NETLINK_CB(in_skb).portid,
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)
135 if (!inet_diag_bc_sk(bc, sk))
138 return inet_sk_diag_fill(sk, NULL, skb, cb, r, NLM_F_MULTI, net_admin);
141 static void raw_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
142 const struct inet_diag_req_v2 *r)
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;
152 if (IS_ERR(hashinfo))
156 bc = cb_data->inet_diag_nla_bc;
157 s_slot = cb->args[0];
158 num = s_num = cb->args[1];
160 read_lock(&hashinfo->lock);
161 for (slot = s_slot; slot < RAW_HTABLE_SIZE; s_num = 0, slot++) {
164 sk_for_each(sk, &hashinfo->ht[slot]) {
165 struct inet_sock *inet = inet_sk(sk);
167 if (!net_eq(sock_net(sk), net))
171 if (sk->sk_family != r->sdiag_family)
173 if (r->id.idiag_sport != inet->inet_sport &&
176 if (r->id.idiag_dport != inet->inet_dport &&
179 if (sk_diag_dump(sk, skb, cb, r, bc, net_admin) < 0)
187 read_unlock(&hashinfo->lock);
193 static void raw_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
196 r->idiag_rqueue = sk_rmem_alloc_get(sk);
197 r->idiag_wqueue = sk_wmem_alloc_get(sk);
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)
204 struct net *net = sock_net(in_skb->sk);
208 sk = raw_sock_get(net, r);
211 err = sock_diag_destroy(sk, ECONNABORTED);
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,
228 static void __always_unused __check_inet_diag_req_raw(void)
231 * Make sure the two structures are identical,
232 * except the @pad field.
234 #define __offset_mismatch(m1, m2) \
235 (offsetof(struct inet_diag_req_v2, m1) != \
236 offsetof(struct inet_diag_req_raw, m2))
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
249 static int __init raw_diag_init(void)
251 return inet_diag_register(&raw_diag_handler);
254 static void __exit raw_diag_exit(void)
256 inet_diag_unregister(&raw_diag_handler);
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 */);