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Commit | Line | Data |
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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> |
323fbd0e | 30 | #include <net/sock.h> |
3df80d93 ACM |
31 | |
32 | #include "dccp.h" | |
33 | #include "ipv6.h" | |
4b79f0af | 34 | #include "feat.h" |
3df80d93 | 35 | |
13f51d82 | 36 | /* The per-net dccp.v6_ctl_sk is used for sending RSTs and ACKs */ |
72478873 | 37 | |
3b401a81 SH |
38 | static const struct inet_connection_sock_af_ops dccp_ipv6_mapped; |
39 | static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops; | |
3df80d93 | 40 | |
6f4e5fff | 41 | /* add pseudo-header to DCCP checksum stored in skb->csum */ |
868c86bc | 42 | static inline __sum16 dccp_v6_csum_finish(struct sk_buff *skb, |
b71d1d42 ED |
43 | const struct in6_addr *saddr, |
44 | const struct in6_addr *daddr) | |
3df80d93 | 45 | { |
6f4e5fff GR |
46 | return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum); |
47 | } | |
48 | ||
bb296246 | 49 | static inline void dccp_v6_send_check(struct sock *sk, struct sk_buff *skb) |
6f4e5fff GR |
50 | { |
51 | struct ipv6_pinfo *np = inet6_sk(sk); | |
52 | struct dccp_hdr *dh = dccp_hdr(skb); | |
53 | ||
54 | dccp_csum_outgoing(skb); | |
efe4208f | 55 | dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &sk->sk_v6_daddr); |
3df80d93 ACM |
56 | } |
57 | ||
6e5714ea | 58 | static inline __u64 dccp_v6_init_sequence(struct sk_buff *skb) |
d7f7365f | 59 | { |
0660e03f ACM |
60 | return secure_dccpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, |
61 | ipv6_hdr(skb)->saddr.s6_addr32, | |
d7f7365f GR |
62 | dccp_hdr(skb)->dccph_dport, |
63 | dccp_hdr(skb)->dccph_sport ); | |
64 | ||
3df80d93 ACM |
65 | } |
66 | ||
32bbd879 | 67 | static int dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 68 | u8 type, u8 code, int offset, __be32 info) |
3df80d93 | 69 | { |
b71d1d42 | 70 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
1aa9d1a0 | 71 | const struct dccp_hdr *dh; |
e0bcfb0c | 72 | struct dccp_sock *dp; |
3df80d93 ACM |
73 | struct ipv6_pinfo *np; |
74 | struct sock *sk; | |
75 | int err; | |
76 | __u64 seq; | |
ca12a1a4 | 77 | struct net *net = dev_net(skb->dev); |
3df80d93 | 78 | |
1aa9d1a0 ED |
79 | /* Only need dccph_dport & dccph_sport which are the first |
80 | * 4 bytes in dccp header. | |
81 | * Our caller (icmpv6_notify()) already pulled 8 bytes for us. | |
82 | */ | |
83 | BUILD_BUG_ON(offsetofend(struct dccp_hdr, dccph_sport) > 8); | |
84 | BUILD_BUG_ON(offsetofend(struct dccp_hdr, dccph_dport) > 8); | |
85 | dh = (struct dccp_hdr *)(skb->data + offset); | |
860239c5 | 86 | |
52036a43 ED |
87 | sk = __inet6_lookup_established(net, &dccp_hashinfo, |
88 | &hdr->daddr, dh->dccph_dport, | |
89 | &hdr->saddr, ntohs(dh->dccph_sport), | |
4297a0ef | 90 | inet6_iif(skb), 0); |
3df80d93 | 91 | |
52036a43 | 92 | if (!sk) { |
a16292a0 ED |
93 | __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), |
94 | ICMP6_MIB_INERRORS); | |
32bbd879 | 95 | return -ENOENT; |
3df80d93 ACM |
96 | } |
97 | ||
98 | if (sk->sk_state == DCCP_TIME_WAIT) { | |
9469c7b4 | 99 | inet_twsk_put(inet_twsk(sk)); |
32bbd879 | 100 | return 0; |
3df80d93 | 101 | } |
52036a43 | 102 | seq = dccp_hdr_seq(dh); |
32bbd879 SB |
103 | if (sk->sk_state == DCCP_NEW_SYN_RECV) { |
104 | dccp_req_err(sk, seq); | |
105 | return 0; | |
106 | } | |
3df80d93 ACM |
107 | |
108 | bh_lock_sock(sk); | |
109 | if (sock_owned_by_user(sk)) | |
02a1d6e7 | 110 | __NET_INC_STATS(net, LINUX_MIB_LOCKDROPPEDICMPS); |
3df80d93 ACM |
111 | |
112 | if (sk->sk_state == DCCP_CLOSED) | |
113 | goto out; | |
114 | ||
e0bcfb0c | 115 | dp = dccp_sk(sk); |
e0bcfb0c WY |
116 | if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) && |
117 | !between48(seq, dp->dccps_awl, dp->dccps_awh)) { | |
02a1d6e7 | 118 | __NET_INC_STATS(net, LINUX_MIB_OUTOFWINDOWICMPS); |
e0bcfb0c WY |
119 | goto out; |
120 | } | |
121 | ||
3df80d93 ACM |
122 | np = inet6_sk(sk); |
123 | ||
ec18d9a2 | 124 | if (type == NDISC_REDIRECT) { |
45caeaa5 JM |
125 | if (!sock_owned_by_user(sk)) { |
126 | struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie); | |
ec18d9a2 | 127 | |
45caeaa5 JM |
128 | if (dst) |
129 | dst->ops->redirect(dst, sk, skb); | |
130 | } | |
bd784a14 | 131 | goto out; |
ec18d9a2 DM |
132 | } |
133 | ||
3df80d93 | 134 | if (type == ICMPV6_PKT_TOOBIG) { |
3df80d93 ACM |
135 | struct dst_entry *dst = NULL; |
136 | ||
93b36cf3 HFS |
137 | if (!ip6_sk_accept_pmtu(sk)) |
138 | goto out; | |
139 | ||
3df80d93 ACM |
140 | if (sock_owned_by_user(sk)) |
141 | goto out; | |
142 | if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED)) | |
143 | goto out; | |
144 | ||
35ad9b9c DM |
145 | dst = inet6_csk_update_pmtu(sk, ntohl(info)); |
146 | if (!dst) | |
147 | goto out; | |
148 | ||
149 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) | |
3df80d93 | 150 | dccp_sync_mss(sk, dst_mtu(dst)); |
3df80d93 ACM |
151 | goto out; |
152 | } | |
153 | ||
154 | icmpv6_err_convert(type, code, &err); | |
155 | ||
3df80d93 ACM |
156 | /* Might be for an request_sock */ |
157 | switch (sk->sk_state) { | |
3df80d93 ACM |
158 | case DCCP_REQUESTING: |
159 | case DCCP_RESPOND: /* Cannot happen. | |
45329e71 | 160 | It can, it SYNs are crossed. --ANK */ |
3df80d93 | 161 | if (!sock_owned_by_user(sk)) { |
aa62d76b | 162 | __DCCP_INC_STATS(DCCP_MIB_ATTEMPTFAILS); |
3df80d93 ACM |
163 | sk->sk_err = err; |
164 | /* | |
165 | * Wake people up to see the error | |
166 | * (see connect in sock.c) | |
167 | */ | |
168 | sk->sk_error_report(sk); | |
3df80d93 ACM |
169 | dccp_done(sk); |
170 | } else | |
171 | sk->sk_err_soft = err; | |
172 | goto out; | |
173 | } | |
174 | ||
175 | if (!sock_owned_by_user(sk) && np->recverr) { | |
176 | sk->sk_err = err; | |
177 | sk->sk_error_report(sk); | |
178 | } else | |
179 | sk->sk_err_soft = err; | |
180 | ||
181 | out: | |
182 | bh_unlock_sock(sk); | |
183 | sock_put(sk); | |
32bbd879 | 184 | return 0; |
3df80d93 ACM |
185 | } |
186 | ||
187 | ||
ea3bea3a | 188 | static int dccp_v6_send_response(const struct sock *sk, struct request_sock *req) |
3df80d93 | 189 | { |
634fb979 | 190 | struct inet_request_sock *ireq = inet_rsk(req); |
3df80d93 ACM |
191 | struct ipv6_pinfo *np = inet6_sk(sk); |
192 | struct sk_buff *skb; | |
20c59de2 | 193 | struct in6_addr *final_p, final; |
4c9483b2 | 194 | struct flowi6 fl6; |
3df80d93 | 195 | int err = -1; |
fd80eb94 | 196 | struct dst_entry *dst; |
3df80d93 | 197 | |
4c9483b2 DM |
198 | memset(&fl6, 0, sizeof(fl6)); |
199 | fl6.flowi6_proto = IPPROTO_DCCP; | |
634fb979 ED |
200 | fl6.daddr = ireq->ir_v6_rmt_addr; |
201 | fl6.saddr = ireq->ir_v6_loc_addr; | |
4c9483b2 | 202 | fl6.flowlabel = 0; |
634fb979 ED |
203 | fl6.flowi6_oif = ireq->ir_iif; |
204 | fl6.fl6_dport = ireq->ir_rmt_port; | |
b44084c2 | 205 | fl6.fl6_sport = htons(ireq->ir_num); |
4c9483b2 | 206 | security_req_classify_flow(req, flowi6_to_flowi(&fl6)); |
3df80d93 | 207 | |
3df80d93 | 208 | |
45f6fad8 ED |
209 | rcu_read_lock(); |
210 | final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt), &final); | |
211 | rcu_read_unlock(); | |
3df80d93 | 212 | |
0e0d44ab | 213 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 DM |
214 | if (IS_ERR(dst)) { |
215 | err = PTR_ERR(dst); | |
216 | dst = NULL; | |
fd80eb94 | 217 | goto done; |
68d0c6d3 | 218 | } |
3df80d93 ACM |
219 | |
220 | skb = dccp_make_response(sk, dst, req); | |
221 | if (skb != NULL) { | |
222 | struct dccp_hdr *dh = dccp_hdr(skb); | |
56ac42bc | 223 | struct ipv6_txoptions *opt; |
45329e71 | 224 | |
6f4e5fff | 225 | dh->dccph_checksum = dccp_v6_csum_finish(skb, |
634fb979 ED |
226 | &ireq->ir_v6_loc_addr, |
227 | &ireq->ir_v6_rmt_addr); | |
228 | fl6.daddr = ireq->ir_v6_rmt_addr; | |
45f6fad8 | 229 | rcu_read_lock(); |
56ac42bc HD |
230 | opt = ireq->ipv6_opt; |
231 | if (!opt) | |
232 | opt = rcu_dereference(np->opt); | |
92e55f41 | 233 | err = ip6_xmit(sk, skb, &fl6, sk->sk_mark, opt, np->tclass); |
45f6fad8 | 234 | rcu_read_unlock(); |
b9df3cb8 | 235 | err = net_xmit_eval(err); |
3df80d93 ACM |
236 | } |
237 | ||
238 | done: | |
0cbd7825 | 239 | dst_release(dst); |
3df80d93 ACM |
240 | return err; |
241 | } | |
242 | ||
243 | static void dccp_v6_reqsk_destructor(struct request_sock *req) | |
244 | { | |
d99a7bd2 | 245 | dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg); |
56ac42bc | 246 | kfree(inet_rsk(req)->ipv6_opt); |
634fb979 | 247 | kfree_skb(inet_rsk(req)->pktopts); |
3df80d93 ACM |
248 | } |
249 | ||
a00e7444 | 250 | static void dccp_v6_ctl_send_reset(const struct sock *sk, struct sk_buff *rxskb) |
3df80d93 | 251 | { |
b71d1d42 | 252 | const struct ipv6hdr *rxip6h; |
3df80d93 | 253 | struct sk_buff *skb; |
4c9483b2 | 254 | struct flowi6 fl6; |
adf30907 | 255 | struct net *net = dev_net(skb_dst(rxskb)->dev); |
334527d3 | 256 | struct sock *ctl_sk = net->dccp.v6_ctl_sk; |
adf30907 | 257 | struct dst_entry *dst; |
3df80d93 | 258 | |
e356d37a | 259 | if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET) |
3df80d93 ACM |
260 | return; |
261 | ||
262 | if (!ipv6_unicast_destination(rxskb)) | |
45329e71 | 263 | return; |
3df80d93 | 264 | |
02047741 | 265 | skb = dccp_ctl_make_reset(ctl_sk, rxskb); |
45329e71 | 266 | if (skb == NULL) |
8109b02b | 267 | return; |
3df80d93 | 268 | |
0660e03f | 269 | rxip6h = ipv6_hdr(rxskb); |
e356d37a GR |
270 | dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr, |
271 | &rxip6h->daddr); | |
6f4e5fff | 272 | |
4c9483b2 | 273 | memset(&fl6, 0, sizeof(fl6)); |
4e3fd7a0 AD |
274 | fl6.daddr = rxip6h->saddr; |
275 | fl6.saddr = rxip6h->daddr; | |
6f4e5fff | 276 | |
4c9483b2 DM |
277 | fl6.flowi6_proto = IPPROTO_DCCP; |
278 | fl6.flowi6_oif = inet6_iif(rxskb); | |
1958b856 DM |
279 | fl6.fl6_dport = dccp_hdr(skb)->dccph_dport; |
280 | fl6.fl6_sport = dccp_hdr(skb)->dccph_sport; | |
4c9483b2 | 281 | security_skb_classify_flow(rxskb, flowi6_to_flowi(&fl6)); |
3df80d93 ACM |
282 | |
283 | /* sk = NULL, but it is safe for now. RST socket required. */ | |
0e0d44ab | 284 | dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL); |
68d0c6d3 DM |
285 | if (!IS_ERR(dst)) { |
286 | skb_dst_set(skb, dst); | |
92e55f41 | 287 | ip6_xmit(ctl_sk, skb, &fl6, 0, NULL, 0); |
7309f882 ED |
288 | DCCP_INC_STATS(DCCP_MIB_OUTSEGS); |
289 | DCCP_INC_STATS(DCCP_MIB_OUTRSTS); | |
68d0c6d3 | 290 | return; |
3df80d93 ACM |
291 | } |
292 | ||
293 | kfree_skb(skb); | |
294 | } | |
295 | ||
73c9e02c GR |
296 | static struct request_sock_ops dccp6_request_sock_ops = { |
297 | .family = AF_INET6, | |
298 | .obj_size = sizeof(struct dccp6_request_sock), | |
299 | .rtx_syn_ack = dccp_v6_send_response, | |
300 | .send_ack = dccp_reqsk_send_ack, | |
301 | .destructor = dccp_v6_reqsk_destructor, | |
302 | .send_reset = dccp_v6_ctl_send_reset, | |
c72e1183 | 303 | .syn_ack_timeout = dccp_syn_ack_timeout, |
73c9e02c GR |
304 | }; |
305 | ||
3df80d93 ACM |
306 | static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb) |
307 | { | |
3df80d93 ACM |
308 | struct request_sock *req; |
309 | struct dccp_request_sock *dreq; | |
634fb979 | 310 | struct inet_request_sock *ireq; |
3df80d93 | 311 | struct ipv6_pinfo *np = inet6_sk(sk); |
8109b02b | 312 | const __be32 service = dccp_hdr_request(skb)->dccph_req_service; |
3df80d93 | 313 | struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); |
3df80d93 ACM |
314 | |
315 | if (skb->protocol == htons(ETH_P_IP)) | |
316 | return dccp_v4_conn_request(sk, skb); | |
317 | ||
318 | if (!ipv6_unicast_destination(skb)) | |
4a5409a5 | 319 | return 0; /* discard, don't send a reset here */ |
3df80d93 ACM |
320 | |
321 | if (dccp_bad_service_code(sk, service)) { | |
4a5409a5 | 322 | dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE; |
3df80d93 | 323 | goto drop; |
8109b02b | 324 | } |
3df80d93 | 325 | /* |
45329e71 | 326 | * There are no SYN attacks on IPv6, yet... |
3df80d93 | 327 | */ |
4a5409a5 | 328 | dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY; |
3df80d93 | 329 | if (inet_csk_reqsk_queue_is_full(sk)) |
45329e71 | 330 | goto drop; |
3df80d93 | 331 | |
5ea8ea2c | 332 | if (sk_acceptq_is_full(sk)) |
3df80d93 ACM |
333 | goto drop; |
334 | ||
a1a5344d | 335 | req = inet_reqsk_alloc(&dccp6_request_sock_ops, sk, true); |
3df80d93 ACM |
336 | if (req == NULL) |
337 | goto drop; | |
338 | ||
ac75773c GR |
339 | if (dccp_reqsk_init(req, dccp_sk(sk), skb)) |
340 | goto drop_and_free; | |
3df80d93 | 341 | |
8b819412 GR |
342 | dreq = dccp_rsk(req); |
343 | if (dccp_parse_options(sk, dreq, skb)) | |
344 | goto drop_and_free; | |
345 | ||
4237c75c VY |
346 | if (security_inet_conn_request(sk, skb, req)) |
347 | goto drop_and_free; | |
348 | ||
634fb979 ED |
349 | ireq = inet_rsk(req); |
350 | ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr; | |
351 | ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr; | |
3f66b083 | 352 | ireq->ireq_family = AF_INET6; |
b855ff82 | 353 | ireq->ir_mark = inet_request_mark(sk, skb); |
3df80d93 | 354 | |
a224772d | 355 | if (ipv6_opt_accepted(sk, skb, IP6CB(skb)) || |
3df80d93 ACM |
356 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || |
357 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
63354797 | 358 | refcount_inc(&skb->users); |
634fb979 | 359 | ireq->pktopts = skb; |
3df80d93 | 360 | } |
634fb979 | 361 | ireq->ir_iif = sk->sk_bound_dev_if; |
3df80d93 ACM |
362 | |
363 | /* So that link locals have meaning */ | |
364 | if (!sk->sk_bound_dev_if && | |
634fb979 ED |
365 | ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL) |
366 | ireq->ir_iif = inet6_iif(skb); | |
3df80d93 | 367 | |
45329e71 | 368 | /* |
3df80d93 ACM |
369 | * Step 3: Process LISTEN state |
370 | * | |
d83ca5ac | 371 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie |
3df80d93 | 372 | * |
f541fb7e | 373 | * Setting S.SWL/S.SWH to is deferred to dccp_create_openreq_child(). |
3df80d93 | 374 | */ |
3df80d93 | 375 | dreq->dreq_isr = dcb->dccpd_seq; |
f541fb7e | 376 | dreq->dreq_gsr = dreq->dreq_isr; |
865e9022 | 377 | dreq->dreq_iss = dccp_v6_init_sequence(skb); |
f541fb7e | 378 | dreq->dreq_gss = dreq->dreq_iss; |
3df80d93 ACM |
379 | dreq->dreq_service = service; |
380 | ||
1a2c6181 | 381 | if (dccp_v6_send_response(sk, req)) |
3df80d93 ACM |
382 | goto drop_and_free; |
383 | ||
079096f1 | 384 | inet_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT); |
0c2232b0 | 385 | reqsk_put(req); |
3df80d93 ACM |
386 | return 0; |
387 | ||
388 | drop_and_free: | |
389 | reqsk_free(req); | |
390 | drop: | |
aa62d76b | 391 | __DCCP_INC_STATS(DCCP_MIB_ATTEMPTFAILS); |
3df80d93 ACM |
392 | return -1; |
393 | } | |
394 | ||
0c27171e | 395 | static struct sock *dccp_v6_request_recv_sock(const struct sock *sk, |
3df80d93 ACM |
396 | struct sk_buff *skb, |
397 | struct request_sock *req, | |
5e0724d0 ED |
398 | struct dst_entry *dst, |
399 | struct request_sock *req_unhash, | |
400 | bool *own_req) | |
3df80d93 | 401 | { |
634fb979 | 402 | struct inet_request_sock *ireq = inet_rsk(req); |
0c27171e ED |
403 | struct ipv6_pinfo *newnp; |
404 | const struct ipv6_pinfo *np = inet6_sk(sk); | |
45f6fad8 | 405 | struct ipv6_txoptions *opt; |
3df80d93 | 406 | struct inet_sock *newinet; |
3df80d93 ACM |
407 | struct dccp6_sock *newdp6; |
408 | struct sock *newsk; | |
3df80d93 ACM |
409 | |
410 | if (skb->protocol == htons(ETH_P_IP)) { | |
411 | /* | |
412 | * v6 mapped | |
413 | */ | |
5e0724d0 ED |
414 | newsk = dccp_v4_request_recv_sock(sk, skb, req, dst, |
415 | req_unhash, own_req); | |
45329e71 | 416 | if (newsk == NULL) |
3df80d93 ACM |
417 | return NULL; |
418 | ||
419 | newdp6 = (struct dccp6_sock *)newsk; | |
3df80d93 ACM |
420 | newinet = inet_sk(newsk); |
421 | newinet->pinet6 = &newdp6->inet6; | |
422 | newnp = inet6_sk(newsk); | |
423 | ||
424 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
425 | ||
d1e559d0 | 426 | newnp->saddr = newsk->sk_v6_rcv_saddr; |
3df80d93 ACM |
427 | |
428 | inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped; | |
429 | newsk->sk_backlog_rcv = dccp_v4_do_rcv; | |
430 | newnp->pktoptions = NULL; | |
431 | newnp->opt = NULL; | |
83eaddab WC |
432 | newnp->ipv6_mc_list = NULL; |
433 | newnp->ipv6_ac_list = NULL; | |
434 | newnp->ipv6_fl_list = NULL; | |
e0aa6770 ED |
435 | newnp->mcast_oif = inet_iif(skb); |
436 | newnp->mcast_hops = ip_hdr(skb)->ttl; | |
3df80d93 ACM |
437 | |
438 | /* | |
439 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
440 | * here, dccp_create_openreq_child now does this for us, see the comment in | |
441 | * that function for the gory details. -acme | |
442 | */ | |
443 | ||
444 | /* It is tricky place. Until this moment IPv4 tcp | |
445 | worked with IPv6 icsk.icsk_af_ops. | |
446 | Sync it now. | |
447 | */ | |
d83d8461 | 448 | dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
3df80d93 ACM |
449 | |
450 | return newsk; | |
451 | } | |
452 | ||
3df80d93 ACM |
453 | |
454 | if (sk_acceptq_is_full(sk)) | |
455 | goto out_overflow; | |
456 | ||
f76b33c3 | 457 | if (!dst) { |
4c9483b2 DM |
458 | struct flowi6 fl6; |
459 | ||
f76b33c3 ED |
460 | dst = inet6_csk_route_req(sk, &fl6, req, IPPROTO_DCCP); |
461 | if (!dst) | |
3df80d93 | 462 | goto out; |
45329e71 | 463 | } |
3df80d93 ACM |
464 | |
465 | newsk = dccp_create_openreq_child(sk, req, skb); | |
466 | if (newsk == NULL) | |
093d2823 | 467 | goto out_nonewsk; |
3df80d93 ACM |
468 | |
469 | /* | |
470 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
471 | * count here, dccp_create_openreq_child now does this for us, see the | |
472 | * comment in that function for the gory details. -acme | |
473 | */ | |
474 | ||
6bd4f355 | 475 | ip6_dst_store(newsk, dst, NULL, NULL); |
45329e71 ACM |
476 | newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM | |
477 | NETIF_F_TSO); | |
3df80d93 ACM |
478 | newdp6 = (struct dccp6_sock *)newsk; |
479 | newinet = inet_sk(newsk); | |
480 | newinet->pinet6 = &newdp6->inet6; | |
3df80d93 ACM |
481 | newnp = inet6_sk(newsk); |
482 | ||
483 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
484 | ||
634fb979 ED |
485 | newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr; |
486 | newnp->saddr = ireq->ir_v6_loc_addr; | |
487 | newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr; | |
488 | newsk->sk_bound_dev_if = ireq->ir_iif; | |
3df80d93 | 489 | |
45329e71 | 490 | /* Now IPv6 options... |
3df80d93 ACM |
491 | |
492 | First: no IPv4 options. | |
493 | */ | |
f6d8bd05 | 494 | newinet->inet_opt = NULL; |
3df80d93 ACM |
495 | |
496 | /* Clone RX bits */ | |
497 | newnp->rxopt.all = np->rxopt.all; | |
498 | ||
83eaddab WC |
499 | newnp->ipv6_mc_list = NULL; |
500 | newnp->ipv6_ac_list = NULL; | |
501 | newnp->ipv6_fl_list = NULL; | |
3df80d93 | 502 | newnp->pktoptions = NULL; |
3df80d93 ACM |
503 | newnp->opt = NULL; |
504 | newnp->mcast_oif = inet6_iif(skb); | |
0660e03f | 505 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
3df80d93 | 506 | |
45329e71 ACM |
507 | /* |
508 | * Clone native IPv6 options from listening socket (if any) | |
509 | * | |
510 | * Yes, keeping reference count would be much more clever, but we make | |
511 | * one more one thing there: reattach optmem to newsk. | |
3df80d93 | 512 | */ |
56ac42bc HD |
513 | opt = ireq->ipv6_opt; |
514 | if (!opt) | |
515 | opt = rcu_dereference(np->opt); | |
45f6fad8 ED |
516 | if (opt) { |
517 | opt = ipv6_dup_options(newsk, opt); | |
518 | RCU_INIT_POINTER(newnp->opt, opt); | |
519 | } | |
d83d8461 | 520 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
45f6fad8 ED |
521 | if (opt) |
522 | inet_csk(newsk)->icsk_ext_hdr_len = opt->opt_nflen + | |
523 | opt->opt_flen; | |
3df80d93 ACM |
524 | |
525 | dccp_sync_mss(newsk, dst_mtu(dst)); | |
526 | ||
c720c7e8 ED |
527 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
528 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
3df80d93 | 529 | |
093d2823 | 530 | if (__inet_inherit_port(sk, newsk) < 0) { |
e337e24d CP |
531 | inet_csk_prepare_forced_close(newsk); |
532 | dccp_done(newsk); | |
093d2823 BS |
533 | goto out; |
534 | } | |
5e0724d0 | 535 | *own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash)); |
ce105008 ED |
536 | /* Clone pktoptions received with SYN, if we own the req */ |
537 | if (*own_req && ireq->pktopts) { | |
538 | newnp->pktoptions = skb_clone(ireq->pktopts, GFP_ATOMIC); | |
539 | consume_skb(ireq->pktopts); | |
540 | ireq->pktopts = NULL; | |
541 | if (newnp->pktoptions) | |
542 | skb_set_owner_r(newnp->pktoptions, newsk); | |
543 | } | |
3df80d93 ACM |
544 | |
545 | return newsk; | |
546 | ||
547 | out_overflow: | |
02a1d6e7 | 548 | __NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 BS |
549 | out_nonewsk: |
550 | dst_release(dst); | |
3df80d93 | 551 | out: |
02a1d6e7 | 552 | __NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENDROPS); |
3df80d93 ACM |
553 | return NULL; |
554 | } | |
555 | ||
556 | /* The socket must have it's spinlock held when we get | |
557 | * here. | |
558 | * | |
559 | * We have a potential double-lock case here, so even when | |
560 | * doing backlog processing we use the BH locking scheme. | |
561 | * This is because we cannot sleep with the original spinlock | |
562 | * held. | |
563 | */ | |
564 | static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
565 | { | |
566 | struct ipv6_pinfo *np = inet6_sk(sk); | |
567 | struct sk_buff *opt_skb = NULL; | |
568 | ||
569 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
570 | goes to IPv4 receive handler and backlogged. | |
571 | From backlog it always goes here. Kerboom... | |
572 | Fortunately, dccp_rcv_established and rcv_established | |
573 | handle them correctly, but it is not case with | |
574 | dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK | |
575 | */ | |
576 | ||
577 | if (skb->protocol == htons(ETH_P_IP)) | |
578 | return dccp_v4_do_rcv(sk, skb); | |
579 | ||
fda9ef5d | 580 | if (sk_filter(sk, skb)) |
3df80d93 ACM |
581 | goto discard; |
582 | ||
583 | /* | |
45329e71 ACM |
584 | * socket locking is here for SMP purposes as backlog rcv is currently |
585 | * called with bh processing disabled. | |
3df80d93 ACM |
586 | */ |
587 | ||
588 | /* Do Stevens' IPV6_PKTOPTIONS. | |
589 | ||
590 | Yes, guys, it is the only place in our code, where we | |
591 | may make it not affecting IPv4. | |
592 | The rest of code is protocol independent, | |
593 | and I do not like idea to uglify IPv4. | |
594 | ||
595 | Actually, all the idea behind IPV6_PKTOPTIONS | |
596 | looks not very well thought. For now we latch | |
597 | options, received in the last packet, enqueued | |
598 | by tcp. Feel free to propose better solution. | |
c9eaf173 | 599 | --ANK (980728) |
3df80d93 ACM |
600 | */ |
601 | if (np->rxopt.all) | |
602 | opt_skb = skb_clone(skb, GFP_ATOMIC); | |
603 | ||
604 | if (sk->sk_state == DCCP_OPEN) { /* Fast path */ | |
605 | if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len)) | |
606 | goto reset; | |
323fbd0e A |
607 | if (opt_skb) |
608 | goto ipv6_pktoptions; | |
3df80d93 ACM |
609 | return 0; |
610 | } | |
611 | ||
d83ca5ac GR |
612 | /* |
613 | * Step 3: Process LISTEN state | |
614 | * If S.state == LISTEN, | |
615 | * If P.type == Request or P contains a valid Init Cookie option, | |
616 | * (* Must scan the packet's options to check for Init | |
617 | * Cookies. Only Init Cookies are processed here, | |
618 | * however; other options are processed in Step 8. This | |
619 | * scan need only be performed if the endpoint uses Init | |
620 | * Cookies *) | |
621 | * (* Generate a new socket and switch to that socket *) | |
622 | * Set S := new socket for this port pair | |
623 | * S.state = RESPOND | |
624 | * Choose S.ISS (initial seqno) or set from Init Cookies | |
625 | * Initialize S.GAR := S.ISS | |
626 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies | |
627 | * Continue with S.state == RESPOND | |
628 | * (* A Response packet will be generated in Step 11 *) | |
629 | * Otherwise, | |
630 | * Generate Reset(No Connection) unless P.type == Reset | |
631 | * Drop packet and return | |
632 | * | |
633 | * NOTE: the check for the packet types is done in | |
634 | * dccp_rcv_state_process | |
635 | */ | |
3df80d93 ACM |
636 | |
637 | if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len)) | |
638 | goto reset; | |
323fbd0e A |
639 | if (opt_skb) |
640 | goto ipv6_pktoptions; | |
3df80d93 ACM |
641 | return 0; |
642 | ||
643 | reset: | |
cfb6eeb4 | 644 | dccp_v6_ctl_send_reset(sk, skb); |
3df80d93 | 645 | discard: |
45329e71 | 646 | if (opt_skb != NULL) |
3df80d93 ACM |
647 | __kfree_skb(opt_skb); |
648 | kfree_skb(skb); | |
649 | return 0; | |
323fbd0e A |
650 | |
651 | /* Handling IPV6_PKTOPTIONS skb the similar | |
652 | * way it's done for net/ipv6/tcp_ipv6.c | |
653 | */ | |
654 | ipv6_pktoptions: | |
655 | if (!((1 << sk->sk_state) & (DCCPF_CLOSED | DCCPF_LISTEN))) { | |
656 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) | |
657 | np->mcast_oif = inet6_iif(opt_skb); | |
658 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) | |
659 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; | |
660 | if (np->rxopt.bits.rxflow || np->rxopt.bits.rxtclass) | |
661 | np->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(opt_skb)); | |
662 | if (np->repflow) | |
663 | np->flow_label = ip6_flowlabel(ipv6_hdr(opt_skb)); | |
664 | if (ipv6_opt_accepted(sk, opt_skb, | |
665 | &DCCP_SKB_CB(opt_skb)->header.h6)) { | |
666 | skb_set_owner_r(opt_skb, sk); | |
667 | memmove(IP6CB(opt_skb), | |
668 | &DCCP_SKB_CB(opt_skb)->header.h6, | |
669 | sizeof(struct inet6_skb_parm)); | |
670 | opt_skb = xchg(&np->pktoptions, opt_skb); | |
671 | } else { | |
672 | __kfree_skb(opt_skb); | |
673 | opt_skb = xchg(&np->pktoptions, NULL); | |
674 | } | |
675 | } | |
676 | ||
677 | kfree_skb(opt_skb); | |
678 | return 0; | |
3df80d93 ACM |
679 | } |
680 | ||
e5bbef20 | 681 | static int dccp_v6_rcv(struct sk_buff *skb) |
3df80d93 ACM |
682 | { |
683 | const struct dccp_hdr *dh; | |
3b24d854 | 684 | bool refcounted; |
3df80d93 | 685 | struct sock *sk; |
6f4e5fff | 686 | int min_cov; |
3df80d93 | 687 | |
6f4e5fff | 688 | /* Step 1: Check header basics */ |
3df80d93 ACM |
689 | |
690 | if (dccp_invalid_packet(skb)) | |
691 | goto discard_it; | |
692 | ||
6f4e5fff | 693 | /* Step 1: If header checksum is incorrect, drop packet and return. */ |
0660e03f ACM |
694 | if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr, |
695 | &ipv6_hdr(skb)->daddr)) { | |
59348b19 | 696 | DCCP_WARN("dropped packet with invalid checksum\n"); |
6f4e5fff GR |
697 | goto discard_it; |
698 | } | |
699 | ||
3df80d93 ACM |
700 | dh = dccp_hdr(skb); |
701 | ||
fde20105 | 702 | DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh); |
3df80d93 ACM |
703 | DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type; |
704 | ||
705 | if (dccp_packet_without_ack(skb)) | |
706 | DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ; | |
707 | else | |
708 | DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb); | |
709 | ||
4bdc3d66 | 710 | lookup: |
a583636a | 711 | sk = __inet6_lookup_skb(&dccp_hashinfo, skb, __dccp_hdr_len(dh), |
870c3151 | 712 | dh->dccph_sport, dh->dccph_dport, |
4297a0ef | 713 | inet6_iif(skb), 0, &refcounted); |
4bdc3d66 | 714 | if (!sk) { |
d23c7107 GR |
715 | dccp_pr_debug("failed to look up flow ID in table and " |
716 | "get corresponding socket\n"); | |
3df80d93 | 717 | goto no_dccp_socket; |
d23c7107 | 718 | } |
3df80d93 | 719 | |
45329e71 | 720 | /* |
3df80d93 | 721 | * Step 2: |
8109b02b | 722 | * ... or S.state == TIMEWAIT, |
3df80d93 ACM |
723 | * Generate Reset(No Connection) unless P.type == Reset |
724 | * Drop packet and return | |
725 | */ | |
d23c7107 GR |
726 | if (sk->sk_state == DCCP_TIME_WAIT) { |
727 | dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n"); | |
728 | inet_twsk_put(inet_twsk(sk)); | |
729 | goto no_dccp_socket; | |
730 | } | |
3df80d93 | 731 | |
079096f1 ED |
732 | if (sk->sk_state == DCCP_NEW_SYN_RECV) { |
733 | struct request_sock *req = inet_reqsk(sk); | |
7716682c | 734 | struct sock *nsk; |
079096f1 ED |
735 | |
736 | sk = req->rsk_listener; | |
7716682c | 737 | if (unlikely(sk->sk_state != DCCP_LISTEN)) { |
f03f2e15 | 738 | inet_csk_reqsk_queue_drop_and_put(sk, req); |
4bdc3d66 ED |
739 | goto lookup; |
740 | } | |
7716682c | 741 | sock_hold(sk); |
3b24d854 | 742 | refcounted = true; |
7716682c | 743 | nsk = dccp_check_req(sk, skb, req); |
079096f1 ED |
744 | if (!nsk) { |
745 | reqsk_put(req); | |
7716682c | 746 | goto discard_and_relse; |
079096f1 ED |
747 | } |
748 | if (nsk == sk) { | |
079096f1 ED |
749 | reqsk_put(req); |
750 | } else if (dccp_child_process(sk, nsk, skb)) { | |
751 | dccp_v6_ctl_send_reset(sk, skb); | |
7716682c | 752 | goto discard_and_relse; |
079096f1 | 753 | } else { |
7716682c | 754 | sock_put(sk); |
079096f1 ED |
755 | return 0; |
756 | } | |
757 | } | |
6f4e5fff GR |
758 | /* |
759 | * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage | |
8109b02b ACM |
760 | * o if MinCsCov = 0, only packets with CsCov = 0 are accepted |
761 | * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov | |
6f4e5fff GR |
762 | */ |
763 | min_cov = dccp_sk(sk)->dccps_pcrlen; | |
764 | if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) { | |
765 | dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n", | |
766 | dh->dccph_cscov, min_cov); | |
767 | /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */ | |
768 | goto discard_and_relse; | |
769 | } | |
770 | ||
3df80d93 ACM |
771 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
772 | goto discard_and_relse; | |
773 | ||
c3f24cfb ED |
774 | return __sk_receive_skb(sk, skb, 1, dh->dccph_doff * 4, |
775 | refcounted) ? -1 : 0; | |
3df80d93 ACM |
776 | |
777 | no_dccp_socket: | |
778 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
779 | goto discard_it; | |
780 | /* | |
781 | * Step 2: | |
8109b02b | 782 | * If no socket ... |
3df80d93 ACM |
783 | * Generate Reset(No Connection) unless P.type == Reset |
784 | * Drop packet and return | |
785 | */ | |
786 | if (dh->dccph_type != DCCP_PKT_RESET) { | |
787 | DCCP_SKB_CB(skb)->dccpd_reset_code = | |
788 | DCCP_RESET_CODE_NO_CONNECTION; | |
cfb6eeb4 | 789 | dccp_v6_ctl_send_reset(sk, skb); |
3df80d93 | 790 | } |
3df80d93 | 791 | |
d23c7107 | 792 | discard_it: |
3df80d93 ACM |
793 | kfree_skb(skb); |
794 | return 0; | |
795 | ||
796 | discard_and_relse: | |
3b24d854 ED |
797 | if (refcounted) |
798 | sock_put(sk); | |
3df80d93 | 799 | goto discard_it; |
3df80d93 ACM |
800 | } |
801 | ||
73c9e02c GR |
802 | static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
803 | int addr_len) | |
804 | { | |
805 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr; | |
806 | struct inet_connection_sock *icsk = inet_csk(sk); | |
807 | struct inet_sock *inet = inet_sk(sk); | |
808 | struct ipv6_pinfo *np = inet6_sk(sk); | |
809 | struct dccp_sock *dp = dccp_sk(sk); | |
20c59de2 | 810 | struct in6_addr *saddr = NULL, *final_p, final; |
45f6fad8 | 811 | struct ipv6_txoptions *opt; |
4c9483b2 | 812 | struct flowi6 fl6; |
73c9e02c GR |
813 | struct dst_entry *dst; |
814 | int addr_type; | |
815 | int err; | |
816 | ||
817 | dp->dccps_role = DCCP_ROLE_CLIENT; | |
818 | ||
819 | if (addr_len < SIN6_LEN_RFC2133) | |
820 | return -EINVAL; | |
821 | ||
822 | if (usin->sin6_family != AF_INET6) | |
823 | return -EAFNOSUPPORT; | |
824 | ||
4c9483b2 | 825 | memset(&fl6, 0, sizeof(fl6)); |
73c9e02c GR |
826 | |
827 | if (np->sndflow) { | |
4c9483b2 DM |
828 | fl6.flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK; |
829 | IP6_ECN_flow_init(fl6.flowlabel); | |
830 | if (fl6.flowlabel & IPV6_FLOWLABEL_MASK) { | |
73c9e02c | 831 | struct ip6_flowlabel *flowlabel; |
4c9483b2 | 832 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
59c820b2 | 833 | if (IS_ERR(flowlabel)) |
73c9e02c | 834 | return -EINVAL; |
73c9e02c GR |
835 | fl6_sock_release(flowlabel); |
836 | } | |
837 | } | |
838 | /* | |
839 | * connect() to INADDR_ANY means loopback (BSD'ism). | |
840 | */ | |
841 | if (ipv6_addr_any(&usin->sin6_addr)) | |
842 | usin->sin6_addr.s6_addr[15] = 1; | |
843 | ||
844 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
845 | ||
846 | if (addr_type & IPV6_ADDR_MULTICAST) | |
847 | return -ENETUNREACH; | |
848 | ||
849 | if (addr_type & IPV6_ADDR_LINKLOCAL) { | |
850 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
851 | usin->sin6_scope_id) { | |
852 | /* If interface is set while binding, indices | |
853 | * must coincide. | |
854 | */ | |
855 | if (sk->sk_bound_dev_if && | |
856 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
857 | return -EINVAL; | |
858 | ||
859 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
860 | } | |
861 | ||
862 | /* Connect to link-local address requires an interface */ | |
863 | if (!sk->sk_bound_dev_if) | |
864 | return -EINVAL; | |
865 | } | |
866 | ||
efe4208f | 867 | sk->sk_v6_daddr = usin->sin6_addr; |
4c9483b2 | 868 | np->flow_label = fl6.flowlabel; |
73c9e02c GR |
869 | |
870 | /* | |
871 | * DCCP over IPv4 | |
872 | */ | |
873 | if (addr_type == IPV6_ADDR_MAPPED) { | |
874 | u32 exthdrlen = icsk->icsk_ext_hdr_len; | |
875 | struct sockaddr_in sin; | |
876 | ||
877 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
878 | ||
879 | if (__ipv6_only_sock(sk)) | |
880 | return -ENETUNREACH; | |
881 | ||
882 | sin.sin_family = AF_INET; | |
883 | sin.sin_port = usin->sin6_port; | |
884 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
885 | ||
886 | icsk->icsk_af_ops = &dccp_ipv6_mapped; | |
887 | sk->sk_backlog_rcv = dccp_v4_do_rcv; | |
888 | ||
889 | err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
890 | if (err) { | |
891 | icsk->icsk_ext_hdr_len = exthdrlen; | |
892 | icsk->icsk_af_ops = &dccp_ipv6_af_ops; | |
893 | sk->sk_backlog_rcv = dccp_v6_do_rcv; | |
894 | goto failure; | |
73c9e02c | 895 | } |
d1e559d0 | 896 | np->saddr = sk->sk_v6_rcv_saddr; |
73c9e02c GR |
897 | return err; |
898 | } | |
899 | ||
efe4208f ED |
900 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) |
901 | saddr = &sk->sk_v6_rcv_saddr; | |
73c9e02c | 902 | |
4c9483b2 | 903 | fl6.flowi6_proto = IPPROTO_DCCP; |
efe4208f | 904 | fl6.daddr = sk->sk_v6_daddr; |
4e3fd7a0 | 905 | fl6.saddr = saddr ? *saddr : np->saddr; |
4c9483b2 | 906 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
1958b856 DM |
907 | fl6.fl6_dport = usin->sin6_port; |
908 | fl6.fl6_sport = inet->inet_sport; | |
4c9483b2 | 909 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
73c9e02c | 910 | |
1e1d04e6 | 911 | opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk)); |
45f6fad8 | 912 | final_p = fl6_update_dst(&fl6, opt, &final); |
73c9e02c | 913 | |
0e0d44ab | 914 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 DM |
915 | if (IS_ERR(dst)) { |
916 | err = PTR_ERR(dst); | |
73c9e02c | 917 | goto failure; |
14e50e57 | 918 | } |
73c9e02c GR |
919 | |
920 | if (saddr == NULL) { | |
4c9483b2 | 921 | saddr = &fl6.saddr; |
efe4208f | 922 | sk->sk_v6_rcv_saddr = *saddr; |
73c9e02c GR |
923 | } |
924 | ||
925 | /* set the source address */ | |
4e3fd7a0 | 926 | np->saddr = *saddr; |
c720c7e8 | 927 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
73c9e02c | 928 | |
6bd4f355 | 929 | ip6_dst_store(sk, dst, NULL, NULL); |
73c9e02c GR |
930 | |
931 | icsk->icsk_ext_hdr_len = 0; | |
45f6fad8 ED |
932 | if (opt) |
933 | icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen; | |
73c9e02c | 934 | |
c720c7e8 | 935 | inet->inet_dport = usin->sin6_port; |
73c9e02c GR |
936 | |
937 | dccp_set_state(sk, DCCP_REQUESTING); | |
938 | err = inet6_hash_connect(&dccp_death_row, sk); | |
939 | if (err) | |
940 | goto late_failure; | |
d7f7365f GR |
941 | |
942 | dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32, | |
efe4208f | 943 | sk->sk_v6_daddr.s6_addr32, |
c720c7e8 ED |
944 | inet->inet_sport, |
945 | inet->inet_dport); | |
73c9e02c GR |
946 | err = dccp_connect(sk); |
947 | if (err) | |
948 | goto late_failure; | |
949 | ||
950 | return 0; | |
951 | ||
952 | late_failure: | |
953 | dccp_set_state(sk, DCCP_CLOSED); | |
954 | __sk_dst_reset(sk); | |
955 | failure: | |
c720c7e8 | 956 | inet->inet_dport = 0; |
73c9e02c GR |
957 | sk->sk_route_caps = 0; |
958 | return err; | |
959 | } | |
960 | ||
3b401a81 | 961 | static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = { |
543d9cfe ACM |
962 | .queue_xmit = inet6_csk_xmit, |
963 | .send_check = dccp_v6_send_check, | |
964 | .rebuild_header = inet6_sk_rebuild_header, | |
965 | .conn_request = dccp_v6_conn_request, | |
966 | .syn_recv_sock = dccp_v6_request_recv_sock, | |
967 | .net_header_len = sizeof(struct ipv6hdr), | |
968 | .setsockopt = ipv6_setsockopt, | |
969 | .getsockopt = ipv6_getsockopt, | |
970 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
971 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
3fdadf7d | 972 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
973 | .compat_setsockopt = compat_ipv6_setsockopt, |
974 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 975 | #endif |
3df80d93 ACM |
976 | }; |
977 | ||
978 | /* | |
979 | * DCCP over IPv4 via INET6 API | |
980 | */ | |
3b401a81 | 981 | static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = { |
543d9cfe ACM |
982 | .queue_xmit = ip_queue_xmit, |
983 | .send_check = dccp_v4_send_check, | |
984 | .rebuild_header = inet_sk_rebuild_header, | |
985 | .conn_request = dccp_v6_conn_request, | |
986 | .syn_recv_sock = dccp_v6_request_recv_sock, | |
987 | .net_header_len = sizeof(struct iphdr), | |
988 | .setsockopt = ipv6_setsockopt, | |
989 | .getsockopt = ipv6_getsockopt, | |
990 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
991 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
3fdadf7d | 992 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
993 | .compat_setsockopt = compat_ipv6_setsockopt, |
994 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 995 | #endif |
3df80d93 ACM |
996 | }; |
997 | ||
998 | /* NOTE: A lot of things set to zero explicitly by call to | |
999 | * sk_alloc() so need not be done here. | |
1000 | */ | |
1001 | static int dccp_v6_init_sock(struct sock *sk) | |
1002 | { | |
72478873 ACM |
1003 | static __u8 dccp_v6_ctl_sock_initialized; |
1004 | int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized); | |
3df80d93 | 1005 | |
72478873 ACM |
1006 | if (err == 0) { |
1007 | if (unlikely(!dccp_v6_ctl_sock_initialized)) | |
1008 | dccp_v6_ctl_sock_initialized = 1; | |
3df80d93 | 1009 | inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops; |
72478873 | 1010 | } |
3df80d93 ACM |
1011 | |
1012 | return err; | |
1013 | } | |
1014 | ||
7d06b2e0 | 1015 | static void dccp_v6_destroy_sock(struct sock *sk) |
3df80d93 | 1016 | { |
3e0fadc5 | 1017 | dccp_destroy_sock(sk); |
7d06b2e0 | 1018 | inet6_destroy_sock(sk); |
3df80d93 ACM |
1019 | } |
1020 | ||
73c9e02c GR |
1021 | static struct timewait_sock_ops dccp6_timewait_sock_ops = { |
1022 | .twsk_obj_size = sizeof(struct dccp6_timewait_sock), | |
1023 | }; | |
1024 | ||
3df80d93 | 1025 | static struct proto dccp_v6_prot = { |
543d9cfe ACM |
1026 | .name = "DCCPv6", |
1027 | .owner = THIS_MODULE, | |
1028 | .close = dccp_close, | |
1029 | .connect = dccp_v6_connect, | |
1030 | .disconnect = dccp_disconnect, | |
1031 | .ioctl = dccp_ioctl, | |
1032 | .init = dccp_v6_init_sock, | |
1033 | .setsockopt = dccp_setsockopt, | |
1034 | .getsockopt = dccp_getsockopt, | |
1035 | .sendmsg = dccp_sendmsg, | |
1036 | .recvmsg = dccp_recvmsg, | |
1037 | .backlog_rcv = dccp_v6_do_rcv, | |
496611d7 | 1038 | .hash = inet6_hash, |
ab1e0a13 | 1039 | .unhash = inet_unhash, |
543d9cfe | 1040 | .accept = inet_csk_accept, |
ab1e0a13 | 1041 | .get_port = inet_csk_get_port, |
543d9cfe ACM |
1042 | .shutdown = dccp_shutdown, |
1043 | .destroy = dccp_v6_destroy_sock, | |
1044 | .orphan_count = &dccp_orphan_count, | |
1045 | .max_header = MAX_DCCP_HEADER, | |
1046 | .obj_size = sizeof(struct dccp6_sock), | |
5f0d5a3a | 1047 | .slab_flags = SLAB_TYPESAFE_BY_RCU, |
543d9cfe ACM |
1048 | .rsk_prot = &dccp6_request_sock_ops, |
1049 | .twsk_prot = &dccp6_timewait_sock_ops, | |
39d8cda7 | 1050 | .h.hashinfo = &dccp_hashinfo, |
3fdadf7d | 1051 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1052 | .compat_setsockopt = compat_dccp_setsockopt, |
1053 | .compat_getsockopt = compat_dccp_getsockopt, | |
3fdadf7d | 1054 | #endif |
3df80d93 ACM |
1055 | }; |
1056 | ||
41135cc8 | 1057 | static const struct inet6_protocol dccp_v6_protocol = { |
45329e71 ACM |
1058 | .handler = dccp_v6_rcv, |
1059 | .err_handler = dccp_v6_err, | |
1060 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, | |
3df80d93 ACM |
1061 | }; |
1062 | ||
5708e868 | 1063 | static const struct proto_ops inet6_dccp_ops = { |
543d9cfe ACM |
1064 | .family = PF_INET6, |
1065 | .owner = THIS_MODULE, | |
1066 | .release = inet6_release, | |
1067 | .bind = inet6_bind, | |
1068 | .connect = inet_stream_connect, | |
1069 | .socketpair = sock_no_socketpair, | |
1070 | .accept = inet_accept, | |
1071 | .getname = inet6_getname, | |
a11e1d43 | 1072 | .poll = dccp_poll, |
543d9cfe | 1073 | .ioctl = inet6_ioctl, |
c7cbdbf2 | 1074 | .gettstamp = sock_gettstamp, |
543d9cfe ACM |
1075 | .listen = inet_dccp_listen, |
1076 | .shutdown = inet_shutdown, | |
1077 | .setsockopt = sock_common_setsockopt, | |
1078 | .getsockopt = sock_common_getsockopt, | |
1079 | .sendmsg = inet_sendmsg, | |
1080 | .recvmsg = sock_common_recvmsg, | |
1081 | .mmap = sock_no_mmap, | |
1082 | .sendpage = sock_no_sendpage, | |
3fdadf7d | 1083 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1084 | .compat_setsockopt = compat_sock_common_setsockopt, |
1085 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 1086 | #endif |
3df80d93 ACM |
1087 | }; |
1088 | ||
1089 | static struct inet_protosw dccp_v6_protosw = { | |
1090 | .type = SOCK_DCCP, | |
1091 | .protocol = IPPROTO_DCCP, | |
1092 | .prot = &dccp_v6_prot, | |
1093 | .ops = &inet6_dccp_ops, | |
d83d8461 | 1094 | .flags = INET_PROTOSW_ICSK, |
3df80d93 ACM |
1095 | }; |
1096 | ||
2c8c1e72 | 1097 | static int __net_init dccp_v6_init_net(struct net *net) |
8231bd27 | 1098 | { |
d14a0ebd GR |
1099 | if (dccp_hashinfo.bhash == NULL) |
1100 | return -ESOCKTNOSUPPORT; | |
334527d3 | 1101 | |
d14a0ebd GR |
1102 | return inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6, |
1103 | SOCK_DCCP, IPPROTO_DCCP, net); | |
8231bd27 PE |
1104 | } |
1105 | ||
2c8c1e72 | 1106 | static void __net_exit dccp_v6_exit_net(struct net *net) |
8231bd27 | 1107 | { |
334527d3 | 1108 | inet_ctl_sock_destroy(net->dccp.v6_ctl_sk); |
8231bd27 PE |
1109 | } |
1110 | ||
ec7cb62d AR |
1111 | static void __net_exit dccp_v6_exit_batch(struct list_head *net_exit_list) |
1112 | { | |
1113 | inet_twsk_purge(&dccp_hashinfo, AF_INET6); | |
1114 | } | |
1115 | ||
8231bd27 PE |
1116 | static struct pernet_operations dccp_v6_ops = { |
1117 | .init = dccp_v6_init_net, | |
1118 | .exit = dccp_v6_exit_net, | |
ec7cb62d | 1119 | .exit_batch = dccp_v6_exit_batch, |
8231bd27 PE |
1120 | }; |
1121 | ||
3df80d93 ACM |
1122 | static int __init dccp_v6_init(void) |
1123 | { | |
1124 | int err = proto_register(&dccp_v6_prot, 1); | |
1125 | ||
a0f9a4c2 | 1126 | if (err) |
3df80d93 ACM |
1127 | goto out; |
1128 | ||
3df80d93 | 1129 | inet6_register_protosw(&dccp_v6_protosw); |
72478873 | 1130 | |
8231bd27 | 1131 | err = register_pernet_subsys(&dccp_v6_ops); |
a0f9a4c2 | 1132 | if (err) |
8231bd27 | 1133 | goto out_destroy_ctl_sock; |
a0f9a4c2 XL |
1134 | |
1135 | err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP); | |
1136 | if (err) | |
1137 | goto out_unregister_proto; | |
1138 | ||
3df80d93 ACM |
1139 | out: |
1140 | return err; | |
a0f9a4c2 XL |
1141 | out_unregister_proto: |
1142 | unregister_pernet_subsys(&dccp_v6_ops); | |
8231bd27 | 1143 | out_destroy_ctl_sock: |
72478873 | 1144 | inet6_unregister_protosw(&dccp_v6_protosw); |
3df80d93 ACM |
1145 | proto_unregister(&dccp_v6_prot); |
1146 | goto out; | |
1147 | } | |
1148 | ||
1149 | static void __exit dccp_v6_exit(void) | |
1150 | { | |
1151 | inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); | |
a0f9a4c2 | 1152 | unregister_pernet_subsys(&dccp_v6_ops); |
3df80d93 ACM |
1153 | inet6_unregister_protosw(&dccp_v6_protosw); |
1154 | proto_unregister(&dccp_v6_prot); | |
1155 | } | |
1156 | ||
1157 | module_init(dccp_v6_init); | |
1158 | module_exit(dccp_v6_exit); | |
1159 | ||
1160 | /* | |
1161 | * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) | |
1162 | * values directly, Also cover the case where the protocol is not specified, | |
1163 | * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP | |
1164 | */ | |
7131c6c7 JD |
1165 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6); |
1166 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6); | |
3df80d93 ACM |
1167 | MODULE_LICENSE("GPL"); |
1168 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>"); | |
1169 | MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol"); |