Commit | Line | Data |
---|---|---|
2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
3df80d93 ACM |
2 | /* |
3 | * DCCP over IPv6 | |
45329e71 | 4 | * Linux INET6 implementation |
3df80d93 ACM |
5 | * |
6 | * Based on net/dccp6/ipv6.c | |
7 | * | |
8 | * Arnaldo Carvalho de Melo <acme@ghostprotocols.net> | |
3df80d93 ACM |
9 | */ |
10 | ||
3df80d93 ACM |
11 | #include <linux/module.h> |
12 | #include <linux/random.h> | |
5a0e3ad6 | 13 | #include <linux/slab.h> |
3df80d93 | 14 | #include <linux/xfrm.h> |
323fbd0e | 15 | #include <linux/string.h> |
3df80d93 ACM |
16 | |
17 | #include <net/addrconf.h> | |
18 | #include <net/inet_common.h> | |
19 | #include <net/inet_hashtables.h> | |
14c85021 | 20 | #include <net/inet_sock.h> |
3df80d93 ACM |
21 | #include <net/inet6_connection_sock.h> |
22 | #include <net/inet6_hashtables.h> | |
23 | #include <net/ip6_route.h> | |
24 | #include <net/ipv6.h> | |
25 | #include <net/protocol.h> | |
26 | #include <net/transp_v6.h> | |
aa0e4e4a | 27 | #include <net/ip6_checksum.h> |
3df80d93 | 28 | #include <net/xfrm.h> |
6e5714ea | 29 | #include <net/secure_seq.h> |
b98b3304 | 30 | #include <net/netns/generic.h> |
323fbd0e | 31 | #include <net/sock.h> |
3df80d93 ACM |
32 | |
33 | #include "dccp.h" | |
34 | #include "ipv6.h" | |
4b79f0af | 35 | #include "feat.h" |
3df80d93 | 36 | |
b98b3304 FW |
37 | struct dccp_v6_pernet { |
38 | struct sock *v6_ctl_sk; | |
39 | }; | |
40 | ||
41 | static unsigned int dccp_v6_pernet_id __read_mostly; | |
42 | ||
43 | /* The per-net v6_ctl_sk is used for sending RSTs and ACKs */ | |
72478873 | 44 | |
3b401a81 SH |
45 | static const struct inet_connection_sock_af_ops dccp_ipv6_mapped; |
46 | static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops; | |
3df80d93 | 47 | |
6f4e5fff | 48 | /* add pseudo-header to DCCP checksum stored in skb->csum */ |
868c86bc | 49 | static inline __sum16 dccp_v6_csum_finish(struct sk_buff *skb, |
b71d1d42 ED |
50 | const struct in6_addr *saddr, |
51 | const struct in6_addr *daddr) | |
3df80d93 | 52 | { |
6f4e5fff GR |
53 | return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum); |
54 | } | |
55 | ||
bb296246 | 56 | static inline void dccp_v6_send_check(struct sock *sk, struct sk_buff *skb) |
6f4e5fff GR |
57 | { |
58 | struct ipv6_pinfo *np = inet6_sk(sk); | |
59 | struct dccp_hdr *dh = dccp_hdr(skb); | |
60 | ||
61 | dccp_csum_outgoing(skb); | |
efe4208f | 62 | dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &sk->sk_v6_daddr); |
3df80d93 ACM |
63 | } |
64 | ||
6e5714ea | 65 | static inline __u64 dccp_v6_init_sequence(struct sk_buff *skb) |
d7f7365f | 66 | { |
0660e03f ACM |
67 | return secure_dccpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, |
68 | ipv6_hdr(skb)->saddr.s6_addr32, | |
d7f7365f GR |
69 | dccp_hdr(skb)->dccph_dport, |
70 | dccp_hdr(skb)->dccph_sport ); | |
71 | ||
3df80d93 ACM |
72 | } |
73 | ||
32bbd879 | 74 | static int dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 75 | u8 type, u8 code, int offset, __be32 info) |
3df80d93 | 76 | { |
b71d1d42 | 77 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
1aa9d1a0 | 78 | const struct dccp_hdr *dh; |
e0bcfb0c | 79 | struct dccp_sock *dp; |
3df80d93 ACM |
80 | struct ipv6_pinfo *np; |
81 | struct sock *sk; | |
82 | int err; | |
83 | __u64 seq; | |
ca12a1a4 | 84 | struct net *net = dev_net(skb->dev); |
3df80d93 | 85 | |
1aa9d1a0 ED |
86 | /* Only need dccph_dport & dccph_sport which are the first |
87 | * 4 bytes in dccp header. | |
88 | * Our caller (icmpv6_notify()) already pulled 8 bytes for us. | |
89 | */ | |
90 | BUILD_BUG_ON(offsetofend(struct dccp_hdr, dccph_sport) > 8); | |
91 | BUILD_BUG_ON(offsetofend(struct dccp_hdr, dccph_dport) > 8); | |
92 | dh = (struct dccp_hdr *)(skb->data + offset); | |
860239c5 | 93 | |
52036a43 ED |
94 | sk = __inet6_lookup_established(net, &dccp_hashinfo, |
95 | &hdr->daddr, dh->dccph_dport, | |
96 | &hdr->saddr, ntohs(dh->dccph_sport), | |
4297a0ef | 97 | inet6_iif(skb), 0); |
3df80d93 | 98 | |
52036a43 | 99 | if (!sk) { |
a16292a0 ED |
100 | __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), |
101 | ICMP6_MIB_INERRORS); | |
32bbd879 | 102 | return -ENOENT; |
3df80d93 ACM |
103 | } |
104 | ||
105 | if (sk->sk_state == DCCP_TIME_WAIT) { | |
9469c7b4 | 106 | inet_twsk_put(inet_twsk(sk)); |
32bbd879 | 107 | return 0; |
3df80d93 | 108 | } |
52036a43 | 109 | seq = dccp_hdr_seq(dh); |
32bbd879 SB |
110 | if (sk->sk_state == DCCP_NEW_SYN_RECV) { |
111 | dccp_req_err(sk, seq); | |
112 | return 0; | |
113 | } | |
3df80d93 ACM |
114 | |
115 | bh_lock_sock(sk); | |
116 | if (sock_owned_by_user(sk)) | |
02a1d6e7 | 117 | __NET_INC_STATS(net, LINUX_MIB_LOCKDROPPEDICMPS); |
3df80d93 ACM |
118 | |
119 | if (sk->sk_state == DCCP_CLOSED) | |
120 | goto out; | |
121 | ||
e0bcfb0c | 122 | dp = dccp_sk(sk); |
e0bcfb0c WY |
123 | if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) && |
124 | !between48(seq, dp->dccps_awl, dp->dccps_awh)) { | |
02a1d6e7 | 125 | __NET_INC_STATS(net, LINUX_MIB_OUTOFWINDOWICMPS); |
e0bcfb0c WY |
126 | goto out; |
127 | } | |
128 | ||
3df80d93 ACM |
129 | np = inet6_sk(sk); |
130 | ||
ec18d9a2 | 131 | if (type == NDISC_REDIRECT) { |
45caeaa5 JM |
132 | if (!sock_owned_by_user(sk)) { |
133 | struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie); | |
ec18d9a2 | 134 | |
45caeaa5 JM |
135 | if (dst) |
136 | dst->ops->redirect(dst, sk, skb); | |
137 | } | |
bd784a14 | 138 | goto out; |
ec18d9a2 DM |
139 | } |
140 | ||
3df80d93 | 141 | if (type == ICMPV6_PKT_TOOBIG) { |
3df80d93 ACM |
142 | struct dst_entry *dst = NULL; |
143 | ||
93b36cf3 HFS |
144 | if (!ip6_sk_accept_pmtu(sk)) |
145 | goto out; | |
146 | ||
3df80d93 ACM |
147 | if (sock_owned_by_user(sk)) |
148 | goto out; | |
149 | if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED)) | |
150 | goto out; | |
151 | ||
35ad9b9c DM |
152 | dst = inet6_csk_update_pmtu(sk, ntohl(info)); |
153 | if (!dst) | |
154 | goto out; | |
155 | ||
156 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) | |
3df80d93 | 157 | dccp_sync_mss(sk, dst_mtu(dst)); |
3df80d93 ACM |
158 | goto out; |
159 | } | |
160 | ||
161 | icmpv6_err_convert(type, code, &err); | |
162 | ||
3df80d93 ACM |
163 | /* Might be for an request_sock */ |
164 | switch (sk->sk_state) { | |
3df80d93 ACM |
165 | case DCCP_REQUESTING: |
166 | case DCCP_RESPOND: /* Cannot happen. | |
45329e71 | 167 | It can, it SYNs are crossed. --ANK */ |
3df80d93 | 168 | if (!sock_owned_by_user(sk)) { |
aa62d76b | 169 | __DCCP_INC_STATS(DCCP_MIB_ATTEMPTFAILS); |
3df80d93 ACM |
170 | sk->sk_err = err; |
171 | /* | |
172 | * Wake people up to see the error | |
173 | * (see connect in sock.c) | |
174 | */ | |
e3ae2365 | 175 | sk_error_report(sk); |
3df80d93 | 176 | dccp_done(sk); |
9a25f0cb ED |
177 | } else { |
178 | WRITE_ONCE(sk->sk_err_soft, err); | |
179 | } | |
3df80d93 ACM |
180 | goto out; |
181 | } | |
182 | ||
183 | if (!sock_owned_by_user(sk) && np->recverr) { | |
184 | sk->sk_err = err; | |
e3ae2365 | 185 | sk_error_report(sk); |
9a25f0cb ED |
186 | } else { |
187 | WRITE_ONCE(sk->sk_err_soft, err); | |
188 | } | |
3df80d93 ACM |
189 | out: |
190 | bh_unlock_sock(sk); | |
191 | sock_put(sk); | |
32bbd879 | 192 | return 0; |
3df80d93 ACM |
193 | } |
194 | ||
195 | ||
ea3bea3a | 196 | static int dccp_v6_send_response(const struct sock *sk, struct request_sock *req) |
3df80d93 | 197 | { |
634fb979 | 198 | struct inet_request_sock *ireq = inet_rsk(req); |
3df80d93 ACM |
199 | struct ipv6_pinfo *np = inet6_sk(sk); |
200 | struct sk_buff *skb; | |
20c59de2 | 201 | struct in6_addr *final_p, final; |
4c9483b2 | 202 | struct flowi6 fl6; |
3df80d93 | 203 | int err = -1; |
fd80eb94 | 204 | struct dst_entry *dst; |
3df80d93 | 205 | |
4c9483b2 DM |
206 | memset(&fl6, 0, sizeof(fl6)); |
207 | fl6.flowi6_proto = IPPROTO_DCCP; | |
634fb979 ED |
208 | fl6.daddr = ireq->ir_v6_rmt_addr; |
209 | fl6.saddr = ireq->ir_v6_loc_addr; | |
4c9483b2 | 210 | fl6.flowlabel = 0; |
634fb979 ED |
211 | fl6.flowi6_oif = ireq->ir_iif; |
212 | fl6.fl6_dport = ireq->ir_rmt_port; | |
b44084c2 | 213 | fl6.fl6_sport = htons(ireq->ir_num); |
3df98d79 | 214 | security_req_classify_flow(req, flowi6_to_flowi_common(&fl6)); |
3df80d93 | 215 | |
3df80d93 | 216 | |
45f6fad8 ED |
217 | rcu_read_lock(); |
218 | final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt), &final); | |
219 | rcu_read_unlock(); | |
3df80d93 | 220 | |
c4e85f73 | 221 | dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p); |
68d0c6d3 DM |
222 | if (IS_ERR(dst)) { |
223 | err = PTR_ERR(dst); | |
224 | dst = NULL; | |
fd80eb94 | 225 | goto done; |
68d0c6d3 | 226 | } |
3df80d93 ACM |
227 | |
228 | skb = dccp_make_response(sk, dst, req); | |
229 | if (skb != NULL) { | |
230 | struct dccp_hdr *dh = dccp_hdr(skb); | |
56ac42bc | 231 | struct ipv6_txoptions *opt; |
45329e71 | 232 | |
6f4e5fff | 233 | dh->dccph_checksum = dccp_v6_csum_finish(skb, |
634fb979 ED |
234 | &ireq->ir_v6_loc_addr, |
235 | &ireq->ir_v6_rmt_addr); | |
236 | fl6.daddr = ireq->ir_v6_rmt_addr; | |
45f6fad8 | 237 | rcu_read_lock(); |
56ac42bc HD |
238 | opt = ireq->ipv6_opt; |
239 | if (!opt) | |
240 | opt = rcu_dereference(np->opt); | |
4f6570d7 ED |
241 | err = ip6_xmit(sk, skb, &fl6, sk->sk_mark, opt, np->tclass, |
242 | sk->sk_priority); | |
45f6fad8 | 243 | rcu_read_unlock(); |
b9df3cb8 | 244 | err = net_xmit_eval(err); |
3df80d93 ACM |
245 | } |
246 | ||
247 | done: | |
0cbd7825 | 248 | dst_release(dst); |
3df80d93 ACM |
249 | return err; |
250 | } | |
251 | ||
252 | static void dccp_v6_reqsk_destructor(struct request_sock *req) | |
253 | { | |
d99a7bd2 | 254 | dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg); |
56ac42bc | 255 | kfree(inet_rsk(req)->ipv6_opt); |
634fb979 | 256 | kfree_skb(inet_rsk(req)->pktopts); |
3df80d93 ACM |
257 | } |
258 | ||
a00e7444 | 259 | static void dccp_v6_ctl_send_reset(const struct sock *sk, struct sk_buff *rxskb) |
3df80d93 | 260 | { |
b71d1d42 | 261 | const struct ipv6hdr *rxip6h; |
3df80d93 | 262 | struct sk_buff *skb; |
4c9483b2 | 263 | struct flowi6 fl6; |
adf30907 | 264 | struct net *net = dev_net(skb_dst(rxskb)->dev); |
b98b3304 FW |
265 | struct dccp_v6_pernet *pn; |
266 | struct sock *ctl_sk; | |
adf30907 | 267 | struct dst_entry *dst; |
3df80d93 | 268 | |
e356d37a | 269 | if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET) |
3df80d93 ACM |
270 | return; |
271 | ||
272 | if (!ipv6_unicast_destination(rxskb)) | |
45329e71 | 273 | return; |
3df80d93 | 274 | |
b98b3304 FW |
275 | pn = net_generic(net, dccp_v6_pernet_id); |
276 | ctl_sk = pn->v6_ctl_sk; | |
02047741 | 277 | skb = dccp_ctl_make_reset(ctl_sk, rxskb); |
45329e71 | 278 | if (skb == NULL) |
8109b02b | 279 | return; |
3df80d93 | 280 | |
0660e03f | 281 | rxip6h = ipv6_hdr(rxskb); |
e356d37a GR |
282 | dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr, |
283 | &rxip6h->daddr); | |
6f4e5fff | 284 | |
4c9483b2 | 285 | memset(&fl6, 0, sizeof(fl6)); |
4e3fd7a0 AD |
286 | fl6.daddr = rxip6h->saddr; |
287 | fl6.saddr = rxip6h->daddr; | |
6f4e5fff | 288 | |
4c9483b2 DM |
289 | fl6.flowi6_proto = IPPROTO_DCCP; |
290 | fl6.flowi6_oif = inet6_iif(rxskb); | |
1958b856 DM |
291 | fl6.fl6_dport = dccp_hdr(skb)->dccph_dport; |
292 | fl6.fl6_sport = dccp_hdr(skb)->dccph_sport; | |
3df98d79 | 293 | security_skb_classify_flow(rxskb, flowi6_to_flowi_common(&fl6)); |
3df80d93 ACM |
294 | |
295 | /* sk = NULL, but it is safe for now. RST socket required. */ | |
c4e85f73 | 296 | dst = ip6_dst_lookup_flow(sock_net(ctl_sk), ctl_sk, &fl6, NULL); |
68d0c6d3 DM |
297 | if (!IS_ERR(dst)) { |
298 | skb_dst_set(skb, dst); | |
4f6570d7 | 299 | ip6_xmit(ctl_sk, skb, &fl6, 0, NULL, 0, 0); |
7309f882 ED |
300 | DCCP_INC_STATS(DCCP_MIB_OUTSEGS); |
301 | DCCP_INC_STATS(DCCP_MIB_OUTRSTS); | |
68d0c6d3 | 302 | return; |
3df80d93 ACM |
303 | } |
304 | ||
305 | kfree_skb(skb); | |
306 | } | |
307 | ||
73c9e02c GR |
308 | static struct request_sock_ops dccp6_request_sock_ops = { |
309 | .family = AF_INET6, | |
310 | .obj_size = sizeof(struct dccp6_request_sock), | |
311 | .rtx_syn_ack = dccp_v6_send_response, | |
312 | .send_ack = dccp_reqsk_send_ack, | |
313 | .destructor = dccp_v6_reqsk_destructor, | |
314 | .send_reset = dccp_v6_ctl_send_reset, | |
c72e1183 | 315 | .syn_ack_timeout = dccp_syn_ack_timeout, |
73c9e02c GR |
316 | }; |
317 | ||
3df80d93 ACM |
318 | static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb) |
319 | { | |
3df80d93 ACM |
320 | struct request_sock *req; |
321 | struct dccp_request_sock *dreq; | |
634fb979 | 322 | struct inet_request_sock *ireq; |
3df80d93 | 323 | struct ipv6_pinfo *np = inet6_sk(sk); |
8109b02b | 324 | const __be32 service = dccp_hdr_request(skb)->dccph_req_service; |
3df80d93 | 325 | struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); |
3df80d93 ACM |
326 | |
327 | if (skb->protocol == htons(ETH_P_IP)) | |
328 | return dccp_v4_conn_request(sk, skb); | |
329 | ||
330 | if (!ipv6_unicast_destination(skb)) | |
4a5409a5 | 331 | return 0; /* discard, don't send a reset here */ |
3df80d93 | 332 | |
dcc32f4f JK |
333 | if (ipv6_addr_v4mapped(&ipv6_hdr(skb)->saddr)) { |
334 | __IP6_INC_STATS(sock_net(sk), NULL, IPSTATS_MIB_INHDRERRORS); | |
335 | return 0; | |
336 | } | |
337 | ||
3df80d93 | 338 | if (dccp_bad_service_code(sk, service)) { |
4a5409a5 | 339 | dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE; |
3df80d93 | 340 | goto drop; |
8109b02b | 341 | } |
3df80d93 | 342 | /* |
45329e71 | 343 | * There are no SYN attacks on IPv6, yet... |
3df80d93 | 344 | */ |
4a5409a5 | 345 | dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY; |
3df80d93 | 346 | if (inet_csk_reqsk_queue_is_full(sk)) |
45329e71 | 347 | goto drop; |
3df80d93 | 348 | |
5ea8ea2c | 349 | if (sk_acceptq_is_full(sk)) |
3df80d93 ACM |
350 | goto drop; |
351 | ||
a1a5344d | 352 | req = inet_reqsk_alloc(&dccp6_request_sock_ops, sk, true); |
3df80d93 ACM |
353 | if (req == NULL) |
354 | goto drop; | |
355 | ||
ac75773c GR |
356 | if (dccp_reqsk_init(req, dccp_sk(sk), skb)) |
357 | goto drop_and_free; | |
3df80d93 | 358 | |
8b819412 GR |
359 | dreq = dccp_rsk(req); |
360 | if (dccp_parse_options(sk, dreq, skb)) | |
361 | goto drop_and_free; | |
362 | ||
4237c75c VY |
363 | if (security_inet_conn_request(sk, skb, req)) |
364 | goto drop_and_free; | |
365 | ||
634fb979 ED |
366 | ireq = inet_rsk(req); |
367 | ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr; | |
368 | ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr; | |
3f66b083 | 369 | ireq->ireq_family = AF_INET6; |
b855ff82 | 370 | ireq->ir_mark = inet_request_mark(sk, skb); |
3df80d93 | 371 | |
a224772d | 372 | if (ipv6_opt_accepted(sk, skb, IP6CB(skb)) || |
3df80d93 ACM |
373 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || |
374 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
63354797 | 375 | refcount_inc(&skb->users); |
634fb979 | 376 | ireq->pktopts = skb; |
3df80d93 | 377 | } |
36f7cec4 | 378 | ireq->ir_iif = READ_ONCE(sk->sk_bound_dev_if); |
3df80d93 ACM |
379 | |
380 | /* So that link locals have meaning */ | |
36f7cec4 | 381 | if (!ireq->ir_iif && |
634fb979 ED |
382 | ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL) |
383 | ireq->ir_iif = inet6_iif(skb); | |
3df80d93 | 384 | |
45329e71 | 385 | /* |
3df80d93 ACM |
386 | * Step 3: Process LISTEN state |
387 | * | |
d83ca5ac | 388 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie |
3df80d93 | 389 | * |
f541fb7e | 390 | * Setting S.SWL/S.SWH to is deferred to dccp_create_openreq_child(). |
3df80d93 | 391 | */ |
3df80d93 | 392 | dreq->dreq_isr = dcb->dccpd_seq; |
f541fb7e | 393 | dreq->dreq_gsr = dreq->dreq_isr; |
865e9022 | 394 | dreq->dreq_iss = dccp_v6_init_sequence(skb); |
f541fb7e | 395 | dreq->dreq_gss = dreq->dreq_iss; |
3df80d93 ACM |
396 | dreq->dreq_service = service; |
397 | ||
1a2c6181 | 398 | if (dccp_v6_send_response(sk, req)) |
3df80d93 ACM |
399 | goto drop_and_free; |
400 | ||
079096f1 | 401 | inet_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT); |
0c2232b0 | 402 | reqsk_put(req); |
3df80d93 ACM |
403 | return 0; |
404 | ||
405 | drop_and_free: | |
406 | reqsk_free(req); | |
407 | drop: | |
aa62d76b | 408 | __DCCP_INC_STATS(DCCP_MIB_ATTEMPTFAILS); |
3df80d93 ACM |
409 | return -1; |
410 | } | |
411 | ||
0c27171e | 412 | static struct sock *dccp_v6_request_recv_sock(const struct sock *sk, |
3df80d93 ACM |
413 | struct sk_buff *skb, |
414 | struct request_sock *req, | |
5e0724d0 ED |
415 | struct dst_entry *dst, |
416 | struct request_sock *req_unhash, | |
417 | bool *own_req) | |
3df80d93 | 418 | { |
634fb979 | 419 | struct inet_request_sock *ireq = inet_rsk(req); |
0c27171e ED |
420 | struct ipv6_pinfo *newnp; |
421 | const struct ipv6_pinfo *np = inet6_sk(sk); | |
45f6fad8 | 422 | struct ipv6_txoptions *opt; |
3df80d93 | 423 | struct inet_sock *newinet; |
3df80d93 ACM |
424 | struct dccp6_sock *newdp6; |
425 | struct sock *newsk; | |
3df80d93 ACM |
426 | |
427 | if (skb->protocol == htons(ETH_P_IP)) { | |
428 | /* | |
429 | * v6 mapped | |
430 | */ | |
5e0724d0 ED |
431 | newsk = dccp_v4_request_recv_sock(sk, skb, req, dst, |
432 | req_unhash, own_req); | |
45329e71 | 433 | if (newsk == NULL) |
3df80d93 ACM |
434 | return NULL; |
435 | ||
436 | newdp6 = (struct dccp6_sock *)newsk; | |
3df80d93 ACM |
437 | newinet = inet_sk(newsk); |
438 | newinet->pinet6 = &newdp6->inet6; | |
439 | newnp = inet6_sk(newsk); | |
440 | ||
441 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
442 | ||
d1e559d0 | 443 | newnp->saddr = newsk->sk_v6_rcv_saddr; |
3df80d93 ACM |
444 | |
445 | inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped; | |
446 | newsk->sk_backlog_rcv = dccp_v4_do_rcv; | |
447 | newnp->pktoptions = NULL; | |
448 | newnp->opt = NULL; | |
83eaddab WC |
449 | newnp->ipv6_mc_list = NULL; |
450 | newnp->ipv6_ac_list = NULL; | |
451 | newnp->ipv6_fl_list = NULL; | |
e0aa6770 ED |
452 | newnp->mcast_oif = inet_iif(skb); |
453 | newnp->mcast_hops = ip_hdr(skb)->ttl; | |
3df80d93 ACM |
454 | |
455 | /* | |
456 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
457 | * here, dccp_create_openreq_child now does this for us, see the comment in | |
458 | * that function for the gory details. -acme | |
459 | */ | |
460 | ||
461 | /* It is tricky place. Until this moment IPv4 tcp | |
462 | worked with IPv6 icsk.icsk_af_ops. | |
463 | Sync it now. | |
464 | */ | |
d83d8461 | 465 | dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
3df80d93 ACM |
466 | |
467 | return newsk; | |
468 | } | |
469 | ||
3df80d93 ACM |
470 | |
471 | if (sk_acceptq_is_full(sk)) | |
472 | goto out_overflow; | |
473 | ||
f76b33c3 | 474 | if (!dst) { |
4c9483b2 DM |
475 | struct flowi6 fl6; |
476 | ||
f76b33c3 ED |
477 | dst = inet6_csk_route_req(sk, &fl6, req, IPPROTO_DCCP); |
478 | if (!dst) | |
3df80d93 | 479 | goto out; |
45329e71 | 480 | } |
3df80d93 ACM |
481 | |
482 | newsk = dccp_create_openreq_child(sk, req, skb); | |
483 | if (newsk == NULL) | |
093d2823 | 484 | goto out_nonewsk; |
3df80d93 ACM |
485 | |
486 | /* | |
487 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
488 | * count here, dccp_create_openreq_child now does this for us, see the | |
489 | * comment in that function for the gory details. -acme | |
490 | */ | |
491 | ||
6bd4f355 | 492 | ip6_dst_store(newsk, dst, NULL, NULL); |
45329e71 ACM |
493 | newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM | |
494 | NETIF_F_TSO); | |
3df80d93 ACM |
495 | newdp6 = (struct dccp6_sock *)newsk; |
496 | newinet = inet_sk(newsk); | |
497 | newinet->pinet6 = &newdp6->inet6; | |
3df80d93 ACM |
498 | newnp = inet6_sk(newsk); |
499 | ||
500 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
501 | ||
634fb979 ED |
502 | newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr; |
503 | newnp->saddr = ireq->ir_v6_loc_addr; | |
504 | newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr; | |
505 | newsk->sk_bound_dev_if = ireq->ir_iif; | |
3df80d93 | 506 | |
45329e71 | 507 | /* Now IPv6 options... |
3df80d93 ACM |
508 | |
509 | First: no IPv4 options. | |
510 | */ | |
f6d8bd05 | 511 | newinet->inet_opt = NULL; |
3df80d93 ACM |
512 | |
513 | /* Clone RX bits */ | |
514 | newnp->rxopt.all = np->rxopt.all; | |
515 | ||
83eaddab WC |
516 | newnp->ipv6_mc_list = NULL; |
517 | newnp->ipv6_ac_list = NULL; | |
518 | newnp->ipv6_fl_list = NULL; | |
3df80d93 | 519 | newnp->pktoptions = NULL; |
3df80d93 ACM |
520 | newnp->opt = NULL; |
521 | newnp->mcast_oif = inet6_iif(skb); | |
0660e03f | 522 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
3df80d93 | 523 | |
45329e71 ACM |
524 | /* |
525 | * Clone native IPv6 options from listening socket (if any) | |
526 | * | |
527 | * Yes, keeping reference count would be much more clever, but we make | |
528 | * one more one thing there: reattach optmem to newsk. | |
3df80d93 | 529 | */ |
56ac42bc HD |
530 | opt = ireq->ipv6_opt; |
531 | if (!opt) | |
532 | opt = rcu_dereference(np->opt); | |
45f6fad8 ED |
533 | if (opt) { |
534 | opt = ipv6_dup_options(newsk, opt); | |
535 | RCU_INIT_POINTER(newnp->opt, opt); | |
536 | } | |
d83d8461 | 537 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
45f6fad8 ED |
538 | if (opt) |
539 | inet_csk(newsk)->icsk_ext_hdr_len = opt->opt_nflen + | |
540 | opt->opt_flen; | |
3df80d93 ACM |
541 | |
542 | dccp_sync_mss(newsk, dst_mtu(dst)); | |
543 | ||
c720c7e8 ED |
544 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
545 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
3df80d93 | 546 | |
093d2823 | 547 | if (__inet_inherit_port(sk, newsk) < 0) { |
e337e24d CP |
548 | inet_csk_prepare_forced_close(newsk); |
549 | dccp_done(newsk); | |
093d2823 BS |
550 | goto out; |
551 | } | |
01770a16 | 552 | *own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash), NULL); |
ce105008 ED |
553 | /* Clone pktoptions received with SYN, if we own the req */ |
554 | if (*own_req && ireq->pktopts) { | |
ca43ccf4 | 555 | newnp->pktoptions = skb_clone_and_charge_r(ireq->pktopts, newsk); |
ce105008 ED |
556 | consume_skb(ireq->pktopts); |
557 | ireq->pktopts = NULL; | |
ce105008 | 558 | } |
3df80d93 ACM |
559 | |
560 | return newsk; | |
561 | ||
562 | out_overflow: | |
02a1d6e7 | 563 | __NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 BS |
564 | out_nonewsk: |
565 | dst_release(dst); | |
3df80d93 | 566 | out: |
02a1d6e7 | 567 | __NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENDROPS); |
3df80d93 ACM |
568 | return NULL; |
569 | } | |
570 | ||
571 | /* The socket must have it's spinlock held when we get | |
572 | * here. | |
573 | * | |
574 | * We have a potential double-lock case here, so even when | |
575 | * doing backlog processing we use the BH locking scheme. | |
576 | * This is because we cannot sleep with the original spinlock | |
577 | * held. | |
578 | */ | |
579 | static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
580 | { | |
581 | struct ipv6_pinfo *np = inet6_sk(sk); | |
582 | struct sk_buff *opt_skb = NULL; | |
583 | ||
584 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
585 | goes to IPv4 receive handler and backlogged. | |
586 | From backlog it always goes here. Kerboom... | |
587 | Fortunately, dccp_rcv_established and rcv_established | |
588 | handle them correctly, but it is not case with | |
589 | dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK | |
590 | */ | |
591 | ||
592 | if (skb->protocol == htons(ETH_P_IP)) | |
593 | return dccp_v4_do_rcv(sk, skb); | |
594 | ||
fda9ef5d | 595 | if (sk_filter(sk, skb)) |
3df80d93 ACM |
596 | goto discard; |
597 | ||
598 | /* | |
45329e71 ACM |
599 | * socket locking is here for SMP purposes as backlog rcv is currently |
600 | * called with bh processing disabled. | |
3df80d93 ACM |
601 | */ |
602 | ||
603 | /* Do Stevens' IPV6_PKTOPTIONS. | |
604 | ||
605 | Yes, guys, it is the only place in our code, where we | |
606 | may make it not affecting IPv4. | |
607 | The rest of code is protocol independent, | |
608 | and I do not like idea to uglify IPv4. | |
609 | ||
610 | Actually, all the idea behind IPV6_PKTOPTIONS | |
611 | looks not very well thought. For now we latch | |
612 | options, received in the last packet, enqueued | |
613 | by tcp. Feel free to propose better solution. | |
c9eaf173 | 614 | --ANK (980728) |
3df80d93 ACM |
615 | */ |
616 | if (np->rxopt.all) | |
ca43ccf4 | 617 | opt_skb = skb_clone_and_charge_r(skb, sk); |
3df80d93 ACM |
618 | |
619 | if (sk->sk_state == DCCP_OPEN) { /* Fast path */ | |
620 | if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len)) | |
621 | goto reset; | |
323fbd0e A |
622 | if (opt_skb) |
623 | goto ipv6_pktoptions; | |
3df80d93 ACM |
624 | return 0; |
625 | } | |
626 | ||
d83ca5ac GR |
627 | /* |
628 | * Step 3: Process LISTEN state | |
629 | * If S.state == LISTEN, | |
630 | * If P.type == Request or P contains a valid Init Cookie option, | |
631 | * (* Must scan the packet's options to check for Init | |
632 | * Cookies. Only Init Cookies are processed here, | |
633 | * however; other options are processed in Step 8. This | |
634 | * scan need only be performed if the endpoint uses Init | |
635 | * Cookies *) | |
636 | * (* Generate a new socket and switch to that socket *) | |
637 | * Set S := new socket for this port pair | |
638 | * S.state = RESPOND | |
639 | * Choose S.ISS (initial seqno) or set from Init Cookies | |
640 | * Initialize S.GAR := S.ISS | |
641 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies | |
642 | * Continue with S.state == RESPOND | |
643 | * (* A Response packet will be generated in Step 11 *) | |
644 | * Otherwise, | |
645 | * Generate Reset(No Connection) unless P.type == Reset | |
646 | * Drop packet and return | |
647 | * | |
648 | * NOTE: the check for the packet types is done in | |
649 | * dccp_rcv_state_process | |
650 | */ | |
3df80d93 ACM |
651 | |
652 | if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len)) | |
653 | goto reset; | |
323fbd0e A |
654 | if (opt_skb) |
655 | goto ipv6_pktoptions; | |
3df80d93 ACM |
656 | return 0; |
657 | ||
658 | reset: | |
cfb6eeb4 | 659 | dccp_v6_ctl_send_reset(sk, skb); |
3df80d93 | 660 | discard: |
45329e71 | 661 | if (opt_skb != NULL) |
3df80d93 ACM |
662 | __kfree_skb(opt_skb); |
663 | kfree_skb(skb); | |
664 | return 0; | |
323fbd0e A |
665 | |
666 | /* Handling IPV6_PKTOPTIONS skb the similar | |
667 | * way it's done for net/ipv6/tcp_ipv6.c | |
668 | */ | |
669 | ipv6_pktoptions: | |
670 | if (!((1 << sk->sk_state) & (DCCPF_CLOSED | DCCPF_LISTEN))) { | |
671 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) | |
672 | np->mcast_oif = inet6_iif(opt_skb); | |
673 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) | |
674 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; | |
675 | if (np->rxopt.bits.rxflow || np->rxopt.bits.rxtclass) | |
676 | np->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(opt_skb)); | |
677 | if (np->repflow) | |
678 | np->flow_label = ip6_flowlabel(ipv6_hdr(opt_skb)); | |
679 | if (ipv6_opt_accepted(sk, opt_skb, | |
680 | &DCCP_SKB_CB(opt_skb)->header.h6)) { | |
323fbd0e A |
681 | memmove(IP6CB(opt_skb), |
682 | &DCCP_SKB_CB(opt_skb)->header.h6, | |
683 | sizeof(struct inet6_skb_parm)); | |
684 | opt_skb = xchg(&np->pktoptions, opt_skb); | |
685 | } else { | |
686 | __kfree_skb(opt_skb); | |
687 | opt_skb = xchg(&np->pktoptions, NULL); | |
688 | } | |
689 | } | |
690 | ||
691 | kfree_skb(opt_skb); | |
692 | return 0; | |
3df80d93 ACM |
693 | } |
694 | ||
e5bbef20 | 695 | static int dccp_v6_rcv(struct sk_buff *skb) |
3df80d93 ACM |
696 | { |
697 | const struct dccp_hdr *dh; | |
3b24d854 | 698 | bool refcounted; |
3df80d93 | 699 | struct sock *sk; |
6f4e5fff | 700 | int min_cov; |
3df80d93 | 701 | |
6f4e5fff | 702 | /* Step 1: Check header basics */ |
3df80d93 ACM |
703 | |
704 | if (dccp_invalid_packet(skb)) | |
705 | goto discard_it; | |
706 | ||
6f4e5fff | 707 | /* Step 1: If header checksum is incorrect, drop packet and return. */ |
0660e03f ACM |
708 | if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr, |
709 | &ipv6_hdr(skb)->daddr)) { | |
59348b19 | 710 | DCCP_WARN("dropped packet with invalid checksum\n"); |
6f4e5fff GR |
711 | goto discard_it; |
712 | } | |
713 | ||
3df80d93 ACM |
714 | dh = dccp_hdr(skb); |
715 | ||
fde20105 | 716 | DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh); |
3df80d93 ACM |
717 | DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type; |
718 | ||
719 | if (dccp_packet_without_ack(skb)) | |
720 | DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ; | |
721 | else | |
722 | DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb); | |
723 | ||
4bdc3d66 | 724 | lookup: |
a583636a | 725 | sk = __inet6_lookup_skb(&dccp_hashinfo, skb, __dccp_hdr_len(dh), |
870c3151 | 726 | dh->dccph_sport, dh->dccph_dport, |
4297a0ef | 727 | inet6_iif(skb), 0, &refcounted); |
4bdc3d66 | 728 | if (!sk) { |
d23c7107 GR |
729 | dccp_pr_debug("failed to look up flow ID in table and " |
730 | "get corresponding socket\n"); | |
3df80d93 | 731 | goto no_dccp_socket; |
d23c7107 | 732 | } |
3df80d93 | 733 | |
45329e71 | 734 | /* |
3df80d93 | 735 | * Step 2: |
8109b02b | 736 | * ... or S.state == TIMEWAIT, |
3df80d93 ACM |
737 | * Generate Reset(No Connection) unless P.type == Reset |
738 | * Drop packet and return | |
739 | */ | |
d23c7107 GR |
740 | if (sk->sk_state == DCCP_TIME_WAIT) { |
741 | dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n"); | |
742 | inet_twsk_put(inet_twsk(sk)); | |
743 | goto no_dccp_socket; | |
744 | } | |
3df80d93 | 745 | |
079096f1 ED |
746 | if (sk->sk_state == DCCP_NEW_SYN_RECV) { |
747 | struct request_sock *req = inet_reqsk(sk); | |
7716682c | 748 | struct sock *nsk; |
079096f1 ED |
749 | |
750 | sk = req->rsk_listener; | |
7716682c | 751 | if (unlikely(sk->sk_state != DCCP_LISTEN)) { |
f03f2e15 | 752 | inet_csk_reqsk_queue_drop_and_put(sk, req); |
4bdc3d66 ED |
753 | goto lookup; |
754 | } | |
7716682c | 755 | sock_hold(sk); |
3b24d854 | 756 | refcounted = true; |
7716682c | 757 | nsk = dccp_check_req(sk, skb, req); |
079096f1 ED |
758 | if (!nsk) { |
759 | reqsk_put(req); | |
7716682c | 760 | goto discard_and_relse; |
079096f1 ED |
761 | } |
762 | if (nsk == sk) { | |
079096f1 ED |
763 | reqsk_put(req); |
764 | } else if (dccp_child_process(sk, nsk, skb)) { | |
765 | dccp_v6_ctl_send_reset(sk, skb); | |
7716682c | 766 | goto discard_and_relse; |
079096f1 | 767 | } else { |
7716682c | 768 | sock_put(sk); |
079096f1 ED |
769 | return 0; |
770 | } | |
771 | } | |
6f4e5fff GR |
772 | /* |
773 | * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage | |
8109b02b ACM |
774 | * o if MinCsCov = 0, only packets with CsCov = 0 are accepted |
775 | * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov | |
6f4e5fff GR |
776 | */ |
777 | min_cov = dccp_sk(sk)->dccps_pcrlen; | |
778 | if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) { | |
779 | dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n", | |
780 | dh->dccph_cscov, min_cov); | |
781 | /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */ | |
782 | goto discard_and_relse; | |
783 | } | |
784 | ||
3df80d93 ACM |
785 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
786 | goto discard_and_relse; | |
b0e214d2 | 787 | nf_reset_ct(skb); |
3df80d93 | 788 | |
c3f24cfb ED |
789 | return __sk_receive_skb(sk, skb, 1, dh->dccph_doff * 4, |
790 | refcounted) ? -1 : 0; | |
3df80d93 ACM |
791 | |
792 | no_dccp_socket: | |
793 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
794 | goto discard_it; | |
795 | /* | |
796 | * Step 2: | |
8109b02b | 797 | * If no socket ... |
3df80d93 ACM |
798 | * Generate Reset(No Connection) unless P.type == Reset |
799 | * Drop packet and return | |
800 | */ | |
801 | if (dh->dccph_type != DCCP_PKT_RESET) { | |
802 | DCCP_SKB_CB(skb)->dccpd_reset_code = | |
803 | DCCP_RESET_CODE_NO_CONNECTION; | |
cfb6eeb4 | 804 | dccp_v6_ctl_send_reset(sk, skb); |
3df80d93 | 805 | } |
3df80d93 | 806 | |
d23c7107 | 807 | discard_it: |
3df80d93 ACM |
808 | kfree_skb(skb); |
809 | return 0; | |
810 | ||
811 | discard_and_relse: | |
3b24d854 ED |
812 | if (refcounted) |
813 | sock_put(sk); | |
3df80d93 | 814 | goto discard_it; |
3df80d93 ACM |
815 | } |
816 | ||
73c9e02c GR |
817 | static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
818 | int addr_len) | |
819 | { | |
820 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr; | |
821 | struct inet_connection_sock *icsk = inet_csk(sk); | |
822 | struct inet_sock *inet = inet_sk(sk); | |
823 | struct ipv6_pinfo *np = inet6_sk(sk); | |
824 | struct dccp_sock *dp = dccp_sk(sk); | |
20c59de2 | 825 | struct in6_addr *saddr = NULL, *final_p, final; |
45f6fad8 | 826 | struct ipv6_txoptions *opt; |
4c9483b2 | 827 | struct flowi6 fl6; |
73c9e02c GR |
828 | struct dst_entry *dst; |
829 | int addr_type; | |
830 | int err; | |
831 | ||
832 | dp->dccps_role = DCCP_ROLE_CLIENT; | |
833 | ||
834 | if (addr_len < SIN6_LEN_RFC2133) | |
835 | return -EINVAL; | |
836 | ||
837 | if (usin->sin6_family != AF_INET6) | |
838 | return -EAFNOSUPPORT; | |
839 | ||
4c9483b2 | 840 | memset(&fl6, 0, sizeof(fl6)); |
73c9e02c GR |
841 | |
842 | if (np->sndflow) { | |
4c9483b2 DM |
843 | fl6.flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK; |
844 | IP6_ECN_flow_init(fl6.flowlabel); | |
845 | if (fl6.flowlabel & IPV6_FLOWLABEL_MASK) { | |
73c9e02c | 846 | struct ip6_flowlabel *flowlabel; |
4c9483b2 | 847 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
59c820b2 | 848 | if (IS_ERR(flowlabel)) |
73c9e02c | 849 | return -EINVAL; |
73c9e02c GR |
850 | fl6_sock_release(flowlabel); |
851 | } | |
852 | } | |
853 | /* | |
854 | * connect() to INADDR_ANY means loopback (BSD'ism). | |
855 | */ | |
856 | if (ipv6_addr_any(&usin->sin6_addr)) | |
857 | usin->sin6_addr.s6_addr[15] = 1; | |
858 | ||
859 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
860 | ||
861 | if (addr_type & IPV6_ADDR_MULTICAST) | |
862 | return -ENETUNREACH; | |
863 | ||
864 | if (addr_type & IPV6_ADDR_LINKLOCAL) { | |
865 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
866 | usin->sin6_scope_id) { | |
867 | /* If interface is set while binding, indices | |
868 | * must coincide. | |
869 | */ | |
870 | if (sk->sk_bound_dev_if && | |
871 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
872 | return -EINVAL; | |
873 | ||
874 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
875 | } | |
876 | ||
877 | /* Connect to link-local address requires an interface */ | |
878 | if (!sk->sk_bound_dev_if) | |
879 | return -EINVAL; | |
880 | } | |
881 | ||
efe4208f | 882 | sk->sk_v6_daddr = usin->sin6_addr; |
4c9483b2 | 883 | np->flow_label = fl6.flowlabel; |
73c9e02c GR |
884 | |
885 | /* | |
886 | * DCCP over IPv4 | |
887 | */ | |
888 | if (addr_type == IPV6_ADDR_MAPPED) { | |
889 | u32 exthdrlen = icsk->icsk_ext_hdr_len; | |
890 | struct sockaddr_in sin; | |
891 | ||
892 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
893 | ||
89e9c728 | 894 | if (ipv6_only_sock(sk)) |
73c9e02c GR |
895 | return -ENETUNREACH; |
896 | ||
897 | sin.sin_family = AF_INET; | |
898 | sin.sin_port = usin->sin6_port; | |
899 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
900 | ||
901 | icsk->icsk_af_ops = &dccp_ipv6_mapped; | |
902 | sk->sk_backlog_rcv = dccp_v4_do_rcv; | |
903 | ||
904 | err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
905 | if (err) { | |
906 | icsk->icsk_ext_hdr_len = exthdrlen; | |
907 | icsk->icsk_af_ops = &dccp_ipv6_af_ops; | |
908 | sk->sk_backlog_rcv = dccp_v6_do_rcv; | |
909 | goto failure; | |
73c9e02c | 910 | } |
d1e559d0 | 911 | np->saddr = sk->sk_v6_rcv_saddr; |
73c9e02c GR |
912 | return err; |
913 | } | |
914 | ||
efe4208f ED |
915 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) |
916 | saddr = &sk->sk_v6_rcv_saddr; | |
73c9e02c | 917 | |
4c9483b2 | 918 | fl6.flowi6_proto = IPPROTO_DCCP; |
efe4208f | 919 | fl6.daddr = sk->sk_v6_daddr; |
4e3fd7a0 | 920 | fl6.saddr = saddr ? *saddr : np->saddr; |
4c9483b2 | 921 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
1958b856 DM |
922 | fl6.fl6_dport = usin->sin6_port; |
923 | fl6.fl6_sport = inet->inet_sport; | |
3df98d79 | 924 | security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6)); |
73c9e02c | 925 | |
1e1d04e6 | 926 | opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk)); |
45f6fad8 | 927 | final_p = fl6_update_dst(&fl6, opt, &final); |
73c9e02c | 928 | |
c4e85f73 | 929 | dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p); |
68d0c6d3 DM |
930 | if (IS_ERR(dst)) { |
931 | err = PTR_ERR(dst); | |
73c9e02c | 932 | goto failure; |
14e50e57 | 933 | } |
73c9e02c GR |
934 | |
935 | if (saddr == NULL) { | |
4c9483b2 | 936 | saddr = &fl6.saddr; |
8c5dae4c KI |
937 | |
938 | err = inet_bhash2_update_saddr(sk, saddr, AF_INET6); | |
939 | if (err) | |
940 | goto failure; | |
73c9e02c GR |
941 | } |
942 | ||
943 | /* set the source address */ | |
4e3fd7a0 | 944 | np->saddr = *saddr; |
c720c7e8 | 945 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
73c9e02c | 946 | |
6bd4f355 | 947 | ip6_dst_store(sk, dst, NULL, NULL); |
73c9e02c GR |
948 | |
949 | icsk->icsk_ext_hdr_len = 0; | |
45f6fad8 ED |
950 | if (opt) |
951 | icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen; | |
73c9e02c | 952 | |
c720c7e8 | 953 | inet->inet_dport = usin->sin6_port; |
73c9e02c GR |
954 | |
955 | dccp_set_state(sk, DCCP_REQUESTING); | |
956 | err = inet6_hash_connect(&dccp_death_row, sk); | |
957 | if (err) | |
958 | goto late_failure; | |
d7f7365f GR |
959 | |
960 | dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32, | |
efe4208f | 961 | sk->sk_v6_daddr.s6_addr32, |
c720c7e8 ED |
962 | inet->inet_sport, |
963 | inet->inet_dport); | |
73c9e02c GR |
964 | err = dccp_connect(sk); |
965 | if (err) | |
966 | goto late_failure; | |
967 | ||
968 | return 0; | |
969 | ||
970 | late_failure: | |
971 | dccp_set_state(sk, DCCP_CLOSED); | |
e0833d1f | 972 | inet_bhash2_reset_saddr(sk); |
73c9e02c GR |
973 | __sk_dst_reset(sk); |
974 | failure: | |
c720c7e8 | 975 | inet->inet_dport = 0; |
73c9e02c GR |
976 | sk->sk_route_caps = 0; |
977 | return err; | |
978 | } | |
979 | ||
3b401a81 | 980 | static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = { |
543d9cfe ACM |
981 | .queue_xmit = inet6_csk_xmit, |
982 | .send_check = dccp_v6_send_check, | |
983 | .rebuild_header = inet6_sk_rebuild_header, | |
984 | .conn_request = dccp_v6_conn_request, | |
985 | .syn_recv_sock = dccp_v6_request_recv_sock, | |
986 | .net_header_len = sizeof(struct ipv6hdr), | |
987 | .setsockopt = ipv6_setsockopt, | |
988 | .getsockopt = ipv6_getsockopt, | |
989 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
990 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
3df80d93 ACM |
991 | }; |
992 | ||
993 | /* | |
994 | * DCCP over IPv4 via INET6 API | |
995 | */ | |
3b401a81 | 996 | static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = { |
543d9cfe ACM |
997 | .queue_xmit = ip_queue_xmit, |
998 | .send_check = dccp_v4_send_check, | |
999 | .rebuild_header = inet_sk_rebuild_header, | |
1000 | .conn_request = dccp_v6_conn_request, | |
1001 | .syn_recv_sock = dccp_v6_request_recv_sock, | |
1002 | .net_header_len = sizeof(struct iphdr), | |
1003 | .setsockopt = ipv6_setsockopt, | |
1004 | .getsockopt = ipv6_getsockopt, | |
1005 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1006 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
3df80d93 ACM |
1007 | }; |
1008 | ||
1651951e KI |
1009 | static void dccp_v6_sk_destruct(struct sock *sk) |
1010 | { | |
1011 | dccp_destruct_common(sk); | |
1012 | inet6_sock_destruct(sk); | |
1013 | } | |
1014 | ||
3df80d93 ACM |
1015 | /* NOTE: A lot of things set to zero explicitly by call to |
1016 | * sk_alloc() so need not be done here. | |
1017 | */ | |
1018 | static int dccp_v6_init_sock(struct sock *sk) | |
1019 | { | |
72478873 ACM |
1020 | static __u8 dccp_v6_ctl_sock_initialized; |
1021 | int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized); | |
3df80d93 | 1022 | |
72478873 ACM |
1023 | if (err == 0) { |
1024 | if (unlikely(!dccp_v6_ctl_sock_initialized)) | |
1025 | dccp_v6_ctl_sock_initialized = 1; | |
3df80d93 | 1026 | inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops; |
1651951e | 1027 | sk->sk_destruct = dccp_v6_sk_destruct; |
72478873 | 1028 | } |
3df80d93 ACM |
1029 | |
1030 | return err; | |
1031 | } | |
1032 | ||
73c9e02c GR |
1033 | static struct timewait_sock_ops dccp6_timewait_sock_ops = { |
1034 | .twsk_obj_size = sizeof(struct dccp6_timewait_sock), | |
1035 | }; | |
1036 | ||
3df80d93 | 1037 | static struct proto dccp_v6_prot = { |
543d9cfe ACM |
1038 | .name = "DCCPv6", |
1039 | .owner = THIS_MODULE, | |
1040 | .close = dccp_close, | |
1041 | .connect = dccp_v6_connect, | |
1042 | .disconnect = dccp_disconnect, | |
1043 | .ioctl = dccp_ioctl, | |
1044 | .init = dccp_v6_init_sock, | |
1045 | .setsockopt = dccp_setsockopt, | |
1046 | .getsockopt = dccp_getsockopt, | |
1047 | .sendmsg = dccp_sendmsg, | |
1048 | .recvmsg = dccp_recvmsg, | |
1049 | .backlog_rcv = dccp_v6_do_rcv, | |
496611d7 | 1050 | .hash = inet6_hash, |
ab1e0a13 | 1051 | .unhash = inet_unhash, |
543d9cfe | 1052 | .accept = inet_csk_accept, |
ab1e0a13 | 1053 | .get_port = inet_csk_get_port, |
543d9cfe | 1054 | .shutdown = dccp_shutdown, |
1651951e | 1055 | .destroy = dccp_destroy_sock, |
543d9cfe ACM |
1056 | .orphan_count = &dccp_orphan_count, |
1057 | .max_header = MAX_DCCP_HEADER, | |
1058 | .obj_size = sizeof(struct dccp6_sock), | |
5f0d5a3a | 1059 | .slab_flags = SLAB_TYPESAFE_BY_RCU, |
543d9cfe ACM |
1060 | .rsk_prot = &dccp6_request_sock_ops, |
1061 | .twsk_prot = &dccp6_timewait_sock_ops, | |
39d8cda7 | 1062 | .h.hashinfo = &dccp_hashinfo, |
3df80d93 ACM |
1063 | }; |
1064 | ||
41135cc8 | 1065 | static const struct inet6_protocol dccp_v6_protocol = { |
45329e71 ACM |
1066 | .handler = dccp_v6_rcv, |
1067 | .err_handler = dccp_v6_err, | |
1068 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, | |
3df80d93 ACM |
1069 | }; |
1070 | ||
5708e868 | 1071 | static const struct proto_ops inet6_dccp_ops = { |
543d9cfe ACM |
1072 | .family = PF_INET6, |
1073 | .owner = THIS_MODULE, | |
1074 | .release = inet6_release, | |
1075 | .bind = inet6_bind, | |
1076 | .connect = inet_stream_connect, | |
1077 | .socketpair = sock_no_socketpair, | |
1078 | .accept = inet_accept, | |
1079 | .getname = inet6_getname, | |
a11e1d43 | 1080 | .poll = dccp_poll, |
543d9cfe | 1081 | .ioctl = inet6_ioctl, |
c7cbdbf2 | 1082 | .gettstamp = sock_gettstamp, |
543d9cfe ACM |
1083 | .listen = inet_dccp_listen, |
1084 | .shutdown = inet_shutdown, | |
1085 | .setsockopt = sock_common_setsockopt, | |
1086 | .getsockopt = sock_common_getsockopt, | |
1087 | .sendmsg = inet_sendmsg, | |
1088 | .recvmsg = sock_common_recvmsg, | |
1089 | .mmap = sock_no_mmap, | |
1090 | .sendpage = sock_no_sendpage, | |
3fdadf7d | 1091 | #ifdef CONFIG_COMPAT |
3986912f | 1092 | .compat_ioctl = inet6_compat_ioctl, |
3fdadf7d | 1093 | #endif |
3df80d93 ACM |
1094 | }; |
1095 | ||
1096 | static struct inet_protosw dccp_v6_protosw = { | |
1097 | .type = SOCK_DCCP, | |
1098 | .protocol = IPPROTO_DCCP, | |
1099 | .prot = &dccp_v6_prot, | |
1100 | .ops = &inet6_dccp_ops, | |
d83d8461 | 1101 | .flags = INET_PROTOSW_ICSK, |
3df80d93 ACM |
1102 | }; |
1103 | ||
2c8c1e72 | 1104 | static int __net_init dccp_v6_init_net(struct net *net) |
8231bd27 | 1105 | { |
b98b3304 FW |
1106 | struct dccp_v6_pernet *pn = net_generic(net, dccp_v6_pernet_id); |
1107 | ||
d14a0ebd GR |
1108 | if (dccp_hashinfo.bhash == NULL) |
1109 | return -ESOCKTNOSUPPORT; | |
334527d3 | 1110 | |
b98b3304 | 1111 | return inet_ctl_sock_create(&pn->v6_ctl_sk, PF_INET6, |
d14a0ebd | 1112 | SOCK_DCCP, IPPROTO_DCCP, net); |
8231bd27 PE |
1113 | } |
1114 | ||
2c8c1e72 | 1115 | static void __net_exit dccp_v6_exit_net(struct net *net) |
8231bd27 | 1116 | { |
b98b3304 FW |
1117 | struct dccp_v6_pernet *pn = net_generic(net, dccp_v6_pernet_id); |
1118 | ||
1119 | inet_ctl_sock_destroy(pn->v6_ctl_sk); | |
8231bd27 PE |
1120 | } |
1121 | ||
04c494e6 ED |
1122 | static void __net_exit dccp_v6_exit_batch(struct list_head *net_exit_list) |
1123 | { | |
1124 | inet_twsk_purge(&dccp_hashinfo, AF_INET6); | |
1125 | } | |
1126 | ||
8231bd27 PE |
1127 | static struct pernet_operations dccp_v6_ops = { |
1128 | .init = dccp_v6_init_net, | |
1129 | .exit = dccp_v6_exit_net, | |
04c494e6 | 1130 | .exit_batch = dccp_v6_exit_batch, |
b98b3304 FW |
1131 | .id = &dccp_v6_pernet_id, |
1132 | .size = sizeof(struct dccp_v6_pernet), | |
8231bd27 PE |
1133 | }; |
1134 | ||
3df80d93 ACM |
1135 | static int __init dccp_v6_init(void) |
1136 | { | |
1137 | int err = proto_register(&dccp_v6_prot, 1); | |
1138 | ||
a0f9a4c2 | 1139 | if (err) |
3df80d93 ACM |
1140 | goto out; |
1141 | ||
3df80d93 | 1142 | inet6_register_protosw(&dccp_v6_protosw); |
72478873 | 1143 | |
8231bd27 | 1144 | err = register_pernet_subsys(&dccp_v6_ops); |
a0f9a4c2 | 1145 | if (err) |
8231bd27 | 1146 | goto out_destroy_ctl_sock; |
a0f9a4c2 XL |
1147 | |
1148 | err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP); | |
1149 | if (err) | |
1150 | goto out_unregister_proto; | |
1151 | ||
3df80d93 ACM |
1152 | out: |
1153 | return err; | |
a0f9a4c2 XL |
1154 | out_unregister_proto: |
1155 | unregister_pernet_subsys(&dccp_v6_ops); | |
8231bd27 | 1156 | out_destroy_ctl_sock: |
72478873 | 1157 | inet6_unregister_protosw(&dccp_v6_protosw); |
3df80d93 ACM |
1158 | proto_unregister(&dccp_v6_prot); |
1159 | goto out; | |
1160 | } | |
1161 | ||
1162 | static void __exit dccp_v6_exit(void) | |
1163 | { | |
1164 | inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); | |
a0f9a4c2 | 1165 | unregister_pernet_subsys(&dccp_v6_ops); |
3df80d93 ACM |
1166 | inet6_unregister_protosw(&dccp_v6_protosw); |
1167 | proto_unregister(&dccp_v6_prot); | |
1168 | } | |
1169 | ||
1170 | module_init(dccp_v6_init); | |
1171 | module_exit(dccp_v6_exit); | |
1172 | ||
1173 | /* | |
1174 | * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) | |
1175 | * values directly, Also cover the case where the protocol is not specified, | |
1176 | * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP | |
1177 | */ | |
7131c6c7 JD |
1178 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6); |
1179 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6); | |
3df80d93 ACM |
1180 | MODULE_LICENSE("GPL"); |
1181 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>"); | |
1182 | MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol"); |