Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 1 | /* |
| 2 | * DCCP over IPv6 |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 3 | * Linux INET6 implementation |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 4 | * |
| 5 | * Based on net/dccp6/ipv6.c |
| 6 | * |
| 7 | * Arnaldo Carvalho de Melo <acme@ghostprotocols.net> |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or |
| 10 | * modify it under the terms of the GNU General Public License |
| 11 | * as published by the Free Software Foundation; either version |
| 12 | * 2 of the License, or (at your option) any later version. |
| 13 | */ |
| 14 | |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 15 | #include <linux/module.h> |
| 16 | #include <linux/random.h> |
| 17 | #include <linux/xfrm.h> |
| 18 | |
| 19 | #include <net/addrconf.h> |
| 20 | #include <net/inet_common.h> |
| 21 | #include <net/inet_hashtables.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 22 | #include <net/inet_sock.h> |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 23 | #include <net/inet6_connection_sock.h> |
| 24 | #include <net/inet6_hashtables.h> |
| 25 | #include <net/ip6_route.h> |
| 26 | #include <net/ipv6.h> |
| 27 | #include <net/protocol.h> |
| 28 | #include <net/transp_v6.h> |
David S. Miller | aa0e4e4 | 2006-01-06 22:55:39 -0800 | [diff] [blame] | 29 | #include <net/ip6_checksum.h> |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 30 | #include <net/xfrm.h> |
| 31 | |
| 32 | #include "dccp.h" |
| 33 | #include "ipv6.h" |
Ian McDonald | 4b79f0a | 2006-07-23 23:33:28 -0700 | [diff] [blame] | 34 | #include "feat.h" |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 35 | |
Arnaldo Carvalho de Melo | 7247887 | 2006-03-20 22:00:37 -0800 | [diff] [blame] | 36 | /* Socket used for sending RSTs and ACKs */ |
| 37 | static struct socket *dccp_v6_ctl_socket; |
| 38 | |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 39 | static struct inet_connection_sock_af_ops dccp_ipv6_mapped; |
| 40 | static struct inet_connection_sock_af_ops dccp_ipv6_af_ops; |
| 41 | |
| 42 | static int dccp_v6_get_port(struct sock *sk, unsigned short snum) |
| 43 | { |
| 44 | return inet_csk_get_port(&dccp_hashinfo, sk, snum, |
| 45 | inet6_csk_bind_conflict); |
| 46 | } |
| 47 | |
| 48 | static void dccp_v6_hash(struct sock *sk) |
| 49 | { |
| 50 | if (sk->sk_state != DCCP_CLOSED) { |
| 51 | if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) { |
Arnaldo Carvalho de Melo | c985ed7 | 2006-03-20 21:23:39 -0800 | [diff] [blame] | 52 | dccp_hash(sk); |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 53 | return; |
| 54 | } |
| 55 | local_bh_disable(); |
| 56 | __inet6_hash(&dccp_hashinfo, sk); |
| 57 | local_bh_enable(); |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | static inline u16 dccp_v6_check(struct dccp_hdr *dh, int len, |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 62 | struct in6_addr *saddr, |
| 63 | struct in6_addr *daddr, |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 64 | unsigned long base) |
| 65 | { |
| 66 | return csum_ipv6_magic(saddr, daddr, len, IPPROTO_DCCP, base); |
| 67 | } |
| 68 | |
| 69 | static __u32 dccp_v6_init_sequence(struct sock *sk, struct sk_buff *skb) |
| 70 | { |
| 71 | const struct dccp_hdr *dh = dccp_hdr(skb); |
| 72 | |
| 73 | if (skb->protocol == htons(ETH_P_IPV6)) |
| 74 | return secure_tcpv6_sequence_number(skb->nh.ipv6h->daddr.s6_addr32, |
| 75 | skb->nh.ipv6h->saddr.s6_addr32, |
| 76 | dh->dccph_dport, |
| 77 | dh->dccph_sport); |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 78 | |
| 79 | return secure_dccp_sequence_number(skb->nh.iph->daddr, |
| 80 | skb->nh.iph->saddr, |
| 81 | dh->dccph_dport, |
| 82 | dh->dccph_sport); |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 83 | } |
| 84 | |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 85 | static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 86 | int type, int code, int offset, __be32 info) |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 87 | { |
| 88 | struct ipv6hdr *hdr = (struct ipv6hdr *)skb->data; |
| 89 | const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset); |
| 90 | struct ipv6_pinfo *np; |
| 91 | struct sock *sk; |
| 92 | int err; |
| 93 | __u64 seq; |
| 94 | |
| 95 | sk = inet6_lookup(&dccp_hashinfo, &hdr->daddr, dh->dccph_dport, |
YOSHIFUJI Hideaki | f2776ff | 2006-11-21 17:41:56 -0800 | [diff] [blame] | 96 | &hdr->saddr, dh->dccph_sport, inet6_iif(skb)); |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 97 | |
| 98 | if (sk == NULL) { |
| 99 | ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); |
| 100 | return; |
| 101 | } |
| 102 | |
| 103 | if (sk->sk_state == DCCP_TIME_WAIT) { |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 104 | inet_twsk_put(inet_twsk(sk)); |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 105 | return; |
| 106 | } |
| 107 | |
| 108 | bh_lock_sock(sk); |
| 109 | if (sock_owned_by_user(sk)) |
| 110 | NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS); |
| 111 | |
| 112 | if (sk->sk_state == DCCP_CLOSED) |
| 113 | goto out; |
| 114 | |
| 115 | np = inet6_sk(sk); |
| 116 | |
| 117 | if (type == ICMPV6_PKT_TOOBIG) { |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 118 | struct dst_entry *dst = NULL; |
| 119 | |
| 120 | if (sock_owned_by_user(sk)) |
| 121 | goto out; |
| 122 | if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED)) |
| 123 | goto out; |
| 124 | |
| 125 | /* icmp should have updated the destination cache entry */ |
| 126 | dst = __sk_dst_check(sk, np->dst_cookie); |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 127 | if (dst == NULL) { |
| 128 | struct inet_sock *inet = inet_sk(sk); |
| 129 | struct flowi fl; |
| 130 | |
| 131 | /* BUGGG_FUTURE: Again, it is not clear how |
| 132 | to handle rthdr case. Ignore this complexity |
| 133 | for now. |
| 134 | */ |
| 135 | memset(&fl, 0, sizeof(fl)); |
| 136 | fl.proto = IPPROTO_DCCP; |
| 137 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); |
| 138 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); |
| 139 | fl.oif = sk->sk_bound_dev_if; |
| 140 | fl.fl_ip_dport = inet->dport; |
| 141 | fl.fl_ip_sport = inet->sport; |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 142 | security_sk_classify_flow(sk, &fl); |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 143 | |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 144 | err = ip6_dst_lookup(sk, &dst, &fl); |
| 145 | if (err) { |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 146 | sk->sk_err_soft = -err; |
| 147 | goto out; |
| 148 | } |
| 149 | |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 150 | err = xfrm_lookup(&dst, &fl, sk, 0); |
| 151 | if (err < 0) { |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 152 | sk->sk_err_soft = -err; |
| 153 | goto out; |
| 154 | } |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 155 | } else |
| 156 | dst_hold(dst); |
| 157 | |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 158 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 159 | dccp_sync_mss(sk, dst_mtu(dst)); |
| 160 | } /* else let the usual retransmit timer handle it */ |
| 161 | dst_release(dst); |
| 162 | goto out; |
| 163 | } |
| 164 | |
| 165 | icmpv6_err_convert(type, code, &err); |
| 166 | |
| 167 | seq = DCCP_SKB_CB(skb)->dccpd_seq; |
| 168 | /* Might be for an request_sock */ |
| 169 | switch (sk->sk_state) { |
| 170 | struct request_sock *req, **prev; |
| 171 | case DCCP_LISTEN: |
| 172 | if (sock_owned_by_user(sk)) |
| 173 | goto out; |
| 174 | |
| 175 | req = inet6_csk_search_req(sk, &prev, dh->dccph_dport, |
| 176 | &hdr->daddr, &hdr->saddr, |
| 177 | inet6_iif(skb)); |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 178 | if (req == NULL) |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 179 | goto out; |
| 180 | |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 181 | /* |
| 182 | * ICMPs are not backlogged, hence we cannot get an established |
| 183 | * socket here. |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 184 | */ |
| 185 | BUG_TRAP(req->sk == NULL); |
| 186 | |
| 187 | if (seq != dccp_rsk(req)->dreq_iss) { |
| 188 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); |
| 189 | goto out; |
| 190 | } |
| 191 | |
| 192 | inet_csk_reqsk_queue_drop(sk, req, prev); |
| 193 | goto out; |
| 194 | |
| 195 | case DCCP_REQUESTING: |
| 196 | case DCCP_RESPOND: /* Cannot happen. |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 197 | It can, it SYNs are crossed. --ANK */ |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 198 | if (!sock_owned_by_user(sk)) { |
| 199 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); |
| 200 | sk->sk_err = err; |
| 201 | /* |
| 202 | * Wake people up to see the error |
| 203 | * (see connect in sock.c) |
| 204 | */ |
| 205 | sk->sk_error_report(sk); |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 206 | dccp_done(sk); |
| 207 | } else |
| 208 | sk->sk_err_soft = err; |
| 209 | goto out; |
| 210 | } |
| 211 | |
| 212 | if (!sock_owned_by_user(sk) && np->recverr) { |
| 213 | sk->sk_err = err; |
| 214 | sk->sk_error_report(sk); |
| 215 | } else |
| 216 | sk->sk_err_soft = err; |
| 217 | |
| 218 | out: |
| 219 | bh_unlock_sock(sk); |
| 220 | sock_put(sk); |
| 221 | } |
| 222 | |
| 223 | |
| 224 | static int dccp_v6_send_response(struct sock *sk, struct request_sock *req, |
| 225 | struct dst_entry *dst) |
| 226 | { |
| 227 | struct inet6_request_sock *ireq6 = inet6_rsk(req); |
| 228 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 229 | struct sk_buff *skb; |
| 230 | struct ipv6_txoptions *opt = NULL; |
| 231 | struct in6_addr *final_p = NULL, final; |
| 232 | struct flowi fl; |
| 233 | int err = -1; |
| 234 | |
| 235 | memset(&fl, 0, sizeof(fl)); |
| 236 | fl.proto = IPPROTO_DCCP; |
| 237 | ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr); |
| 238 | ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr); |
| 239 | fl.fl6_flowlabel = 0; |
| 240 | fl.oif = ireq6->iif; |
| 241 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; |
| 242 | fl.fl_ip_sport = inet_sk(sk)->sport; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 243 | security_req_classify_flow(req, &fl); |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 244 | |
| 245 | if (dst == NULL) { |
| 246 | opt = np->opt; |
| 247 | if (opt == NULL && |
| 248 | np->rxopt.bits.osrcrt == 2 && |
| 249 | ireq6->pktopts) { |
| 250 | struct sk_buff *pktopts = ireq6->pktopts; |
| 251 | struct inet6_skb_parm *rxopt = IP6CB(pktopts); |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 252 | |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 253 | if (rxopt->srcrt) |
| 254 | opt = ipv6_invert_rthdr(sk, |
| 255 | (struct ipv6_rt_hdr *)(pktopts->nh.raw + |
| 256 | rxopt->srcrt)); |
| 257 | } |
| 258 | |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 259 | if (opt != NULL && opt->srcrt != NULL) { |
| 260 | const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt; |
| 261 | |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 262 | ipv6_addr_copy(&final, &fl.fl6_dst); |
| 263 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); |
| 264 | final_p = &final; |
| 265 | } |
| 266 | |
| 267 | err = ip6_dst_lookup(sk, &dst, &fl); |
| 268 | if (err) |
| 269 | goto done; |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 270 | |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 271 | if (final_p) |
| 272 | ipv6_addr_copy(&fl.fl6_dst, final_p); |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 273 | |
| 274 | err = xfrm_lookup(&dst, &fl, sk, 0); |
| 275 | if (err < 0) |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 276 | goto done; |
| 277 | } |
| 278 | |
| 279 | skb = dccp_make_response(sk, dst, req); |
| 280 | if (skb != NULL) { |
| 281 | struct dccp_hdr *dh = dccp_hdr(skb); |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 282 | |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 283 | dh->dccph_checksum = dccp_v6_check(dh, skb->len, |
| 284 | &ireq6->loc_addr, |
| 285 | &ireq6->rmt_addr, |
| 286 | csum_partial((char *)dh, |
| 287 | skb->len, |
| 288 | skb->csum)); |
| 289 | ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr); |
| 290 | err = ip6_xmit(sk, skb, &fl, opt, 0); |
| 291 | if (err == NET_XMIT_CN) |
| 292 | err = 0; |
| 293 | } |
| 294 | |
| 295 | done: |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 296 | if (opt != NULL && opt != np->opt) |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 297 | sock_kfree_s(sk, opt, opt->tot_len); |
David S. Miller | 0cbd782 | 2006-01-31 17:53:37 -0800 | [diff] [blame] | 298 | dst_release(dst); |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 299 | return err; |
| 300 | } |
| 301 | |
| 302 | static void dccp_v6_reqsk_destructor(struct request_sock *req) |
| 303 | { |
| 304 | if (inet6_rsk(req)->pktopts != NULL) |
| 305 | kfree_skb(inet6_rsk(req)->pktopts); |
| 306 | } |
| 307 | |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 308 | static void dccp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb) |
| 309 | { |
| 310 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 311 | struct dccp_hdr *dh = dccp_hdr(skb); |
| 312 | |
| 313 | dh->dccph_checksum = csum_ipv6_magic(&np->saddr, &np->daddr, |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 314 | len, IPPROTO_DCCP, |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 315 | csum_partial((char *)dh, |
| 316 | dh->dccph_doff << 2, |
| 317 | skb->csum)); |
| 318 | } |
| 319 | |
| 320 | static void dccp_v6_ctl_send_reset(struct sk_buff *rxskb) |
| 321 | { |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 322 | struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh; |
Arnaldo Carvalho de Melo | 118b2c9 | 2006-03-20 22:31:09 -0800 | [diff] [blame] | 323 | const u32 dccp_hdr_reset_len = sizeof(struct dccp_hdr) + |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 324 | sizeof(struct dccp_hdr_ext) + |
| 325 | sizeof(struct dccp_hdr_reset); |
| 326 | struct sk_buff *skb; |
| 327 | struct flowi fl; |
| 328 | u64 seqno; |
| 329 | |
| 330 | if (rxdh->dccph_type == DCCP_PKT_RESET) |
| 331 | return; |
| 332 | |
| 333 | if (!ipv6_unicast_destination(rxskb)) |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 334 | return; |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 335 | |
Arnaldo Carvalho de Melo | 118b2c9 | 2006-03-20 22:31:09 -0800 | [diff] [blame] | 336 | skb = alloc_skb(dccp_v6_ctl_socket->sk->sk_prot->max_header, |
| 337 | GFP_ATOMIC); |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 338 | if (skb == NULL) |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 339 | return; |
| 340 | |
Arnaldo Carvalho de Melo | 118b2c9 | 2006-03-20 22:31:09 -0800 | [diff] [blame] | 341 | skb_reserve(skb, dccp_v6_ctl_socket->sk->sk_prot->max_header); |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 342 | |
Gerrit Renker | 9b42078 | 2006-11-10 11:22:32 -0200 | [diff] [blame] | 343 | dh = dccp_zeroed_hdr(skb, dccp_hdr_reset_len); |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 344 | |
| 345 | /* Swap the send and the receive. */ |
| 346 | dh->dccph_type = DCCP_PKT_RESET; |
| 347 | dh->dccph_sport = rxdh->dccph_dport; |
| 348 | dh->dccph_dport = rxdh->dccph_sport; |
| 349 | dh->dccph_doff = dccp_hdr_reset_len / 4; |
| 350 | dh->dccph_x = 1; |
| 351 | dccp_hdr_reset(skb)->dccph_reset_code = |
| 352 | DCCP_SKB_CB(rxskb)->dccpd_reset_code; |
| 353 | |
Gerrit Renker | 0e64e94 | 2006-10-24 16:17:51 -0700 | [diff] [blame] | 354 | /* See "8.3.1. Abnormal Termination" in RFC 4340 */ |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 355 | seqno = 0; |
| 356 | if (DCCP_SKB_CB(rxskb)->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ) |
| 357 | dccp_set_seqno(&seqno, DCCP_SKB_CB(rxskb)->dccpd_ack_seq + 1); |
| 358 | |
| 359 | dccp_hdr_set_seq(dh, seqno); |
| 360 | dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), |
| 361 | DCCP_SKB_CB(rxskb)->dccpd_seq); |
| 362 | |
| 363 | memset(&fl, 0, sizeof(fl)); |
| 364 | ipv6_addr_copy(&fl.fl6_dst, &rxskb->nh.ipv6h->saddr); |
| 365 | ipv6_addr_copy(&fl.fl6_src, &rxskb->nh.ipv6h->daddr); |
| 366 | dh->dccph_checksum = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst, |
| 367 | sizeof(*dh), IPPROTO_DCCP, |
| 368 | skb->csum); |
| 369 | fl.proto = IPPROTO_DCCP; |
| 370 | fl.oif = inet6_iif(rxskb); |
| 371 | fl.fl_ip_dport = dh->dccph_dport; |
| 372 | fl.fl_ip_sport = dh->dccph_sport; |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 373 | security_skb_classify_flow(rxskb, &fl); |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 374 | |
| 375 | /* sk = NULL, but it is safe for now. RST socket required. */ |
| 376 | if (!ip6_dst_lookup(NULL, &skb->dst, &fl)) { |
| 377 | if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) { |
Arnaldo Carvalho de Melo | 7247887 | 2006-03-20 22:00:37 -0800 | [diff] [blame] | 378 | ip6_xmit(dccp_v6_ctl_socket->sk, skb, &fl, NULL, 0); |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 379 | DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS); |
| 380 | DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS); |
| 381 | return; |
| 382 | } |
| 383 | } |
| 384 | |
| 385 | kfree_skb(skb); |
| 386 | } |
| 387 | |
Gerrit Renker | 73c9e02 | 2006-11-10 13:01:31 -0200 | [diff] [blame] | 388 | static struct request_sock_ops dccp6_request_sock_ops = { |
| 389 | .family = AF_INET6, |
| 390 | .obj_size = sizeof(struct dccp6_request_sock), |
| 391 | .rtx_syn_ack = dccp_v6_send_response, |
| 392 | .send_ack = dccp_reqsk_send_ack, |
| 393 | .destructor = dccp_v6_reqsk_destructor, |
| 394 | .send_reset = dccp_v6_ctl_send_reset, |
| 395 | }; |
| 396 | |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 397 | static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) |
| 398 | { |
| 399 | const struct dccp_hdr *dh = dccp_hdr(skb); |
| 400 | const struct ipv6hdr *iph = skb->nh.ipv6h; |
| 401 | struct sock *nsk; |
| 402 | struct request_sock **prev; |
| 403 | /* Find possible connection requests. */ |
| 404 | struct request_sock *req = inet6_csk_search_req(sk, &prev, |
| 405 | dh->dccph_sport, |
| 406 | &iph->saddr, |
| 407 | &iph->daddr, |
| 408 | inet6_iif(skb)); |
| 409 | if (req != NULL) |
| 410 | return dccp_check_req(sk, skb, req, prev); |
| 411 | |
| 412 | nsk = __inet6_lookup_established(&dccp_hashinfo, |
| 413 | &iph->saddr, dh->dccph_sport, |
| 414 | &iph->daddr, ntohs(dh->dccph_dport), |
| 415 | inet6_iif(skb)); |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 416 | if (nsk != NULL) { |
| 417 | if (nsk->sk_state != DCCP_TIME_WAIT) { |
| 418 | bh_lock_sock(nsk); |
| 419 | return nsk; |
| 420 | } |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 421 | inet_twsk_put(inet_twsk(nsk)); |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 422 | return NULL; |
| 423 | } |
| 424 | |
| 425 | return sk; |
| 426 | } |
| 427 | |
| 428 | static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb) |
| 429 | { |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 430 | struct request_sock *req; |
| 431 | struct dccp_request_sock *dreq; |
| 432 | struct inet6_request_sock *ireq6; |
| 433 | struct ipv6_pinfo *np = inet6_sk(sk); |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 434 | const __be32 service = dccp_hdr_request(skb)->dccph_req_service; |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 435 | struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); |
| 436 | __u8 reset_code = DCCP_RESET_CODE_TOO_BUSY; |
| 437 | |
| 438 | if (skb->protocol == htons(ETH_P_IP)) |
| 439 | return dccp_v4_conn_request(sk, skb); |
| 440 | |
| 441 | if (!ipv6_unicast_destination(skb)) |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 442 | goto drop; |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 443 | |
| 444 | if (dccp_bad_service_code(sk, service)) { |
| 445 | reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE; |
| 446 | goto drop; |
| 447 | } |
| 448 | /* |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 449 | * There are no SYN attacks on IPv6, yet... |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 450 | */ |
| 451 | if (inet_csk_reqsk_queue_is_full(sk)) |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 452 | goto drop; |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 453 | |
| 454 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) |
| 455 | goto drop; |
| 456 | |
Gerrit Renker | 8270953 | 2006-10-11 16:26:54 +0100 | [diff] [blame] | 457 | req = inet6_reqsk_alloc(&dccp6_request_sock_ops); |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 458 | if (req == NULL) |
| 459 | goto drop; |
| 460 | |
Gerrit Renker | cf55792 | 2006-11-10 16:08:37 -0200 | [diff] [blame] | 461 | if (dccp_parse_options(sk, skb)) |
| 462 | goto drop_and_free; |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 463 | |
Gerrit Renker | cf55792 | 2006-11-10 16:08:37 -0200 | [diff] [blame] | 464 | dccp_reqsk_init(req, skb); |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 465 | |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 466 | if (security_inet_conn_request(sk, skb, req)) |
| 467 | goto drop_and_free; |
| 468 | |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 469 | ireq6 = inet6_rsk(req); |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 470 | ipv6_addr_copy(&ireq6->rmt_addr, &skb->nh.ipv6h->saddr); |
| 471 | ipv6_addr_copy(&ireq6->loc_addr, &skb->nh.ipv6h->daddr); |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 472 | ireq6->pktopts = NULL; |
| 473 | |
| 474 | if (ipv6_opt_accepted(sk, skb) || |
| 475 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || |
| 476 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { |
| 477 | atomic_inc(&skb->users); |
| 478 | ireq6->pktopts = skb; |
| 479 | } |
| 480 | ireq6->iif = sk->sk_bound_dev_if; |
| 481 | |
| 482 | /* So that link locals have meaning */ |
| 483 | if (!sk->sk_bound_dev_if && |
| 484 | ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL) |
| 485 | ireq6->iif = inet6_iif(skb); |
| 486 | |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 487 | /* |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 488 | * Step 3: Process LISTEN state |
| 489 | * |
Gerrit Renker | d83ca5a | 2006-11-10 16:29:14 -0200 | [diff] [blame^] | 490 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 491 | * |
Gerrit Renker | d83ca5a | 2006-11-10 16:29:14 -0200 | [diff] [blame^] | 492 | * In fact we defer setting S.GSR, S.SWL, S.SWH to |
| 493 | * dccp_create_openreq_child. |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 494 | */ |
| 495 | dreq = dccp_rsk(req); |
| 496 | dreq->dreq_isr = dcb->dccpd_seq; |
| 497 | dreq->dreq_iss = dccp_v6_init_sequence(sk, skb); |
| 498 | dreq->dreq_service = service; |
| 499 | |
| 500 | if (dccp_v6_send_response(sk, req, NULL)) |
| 501 | goto drop_and_free; |
| 502 | |
| 503 | inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT); |
| 504 | return 0; |
| 505 | |
| 506 | drop_and_free: |
| 507 | reqsk_free(req); |
| 508 | drop: |
| 509 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); |
| 510 | dcb->dccpd_reset_code = reset_code; |
| 511 | return -1; |
| 512 | } |
| 513 | |
| 514 | static struct sock *dccp_v6_request_recv_sock(struct sock *sk, |
| 515 | struct sk_buff *skb, |
| 516 | struct request_sock *req, |
| 517 | struct dst_entry *dst) |
| 518 | { |
| 519 | struct inet6_request_sock *ireq6 = inet6_rsk(req); |
| 520 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
| 521 | struct inet_sock *newinet; |
| 522 | struct dccp_sock *newdp; |
| 523 | struct dccp6_sock *newdp6; |
| 524 | struct sock *newsk; |
| 525 | struct ipv6_txoptions *opt; |
| 526 | |
| 527 | if (skb->protocol == htons(ETH_P_IP)) { |
| 528 | /* |
| 529 | * v6 mapped |
| 530 | */ |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 531 | newsk = dccp_v4_request_recv_sock(sk, skb, req, dst); |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 532 | if (newsk == NULL) |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 533 | return NULL; |
| 534 | |
| 535 | newdp6 = (struct dccp6_sock *)newsk; |
| 536 | newdp = dccp_sk(newsk); |
| 537 | newinet = inet_sk(newsk); |
| 538 | newinet->pinet6 = &newdp6->inet6; |
| 539 | newnp = inet6_sk(newsk); |
| 540 | |
| 541 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); |
| 542 | |
| 543 | ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF), |
| 544 | newinet->daddr); |
| 545 | |
| 546 | ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF), |
| 547 | newinet->saddr); |
| 548 | |
| 549 | ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr); |
| 550 | |
| 551 | inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped; |
| 552 | newsk->sk_backlog_rcv = dccp_v4_do_rcv; |
| 553 | newnp->pktoptions = NULL; |
| 554 | newnp->opt = NULL; |
| 555 | newnp->mcast_oif = inet6_iif(skb); |
| 556 | newnp->mcast_hops = skb->nh.ipv6h->hop_limit; |
| 557 | |
| 558 | /* |
| 559 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count |
| 560 | * here, dccp_create_openreq_child now does this for us, see the comment in |
| 561 | * that function for the gory details. -acme |
| 562 | */ |
| 563 | |
| 564 | /* It is tricky place. Until this moment IPv4 tcp |
| 565 | worked with IPv6 icsk.icsk_af_ops. |
| 566 | Sync it now. |
| 567 | */ |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 568 | dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 569 | |
| 570 | return newsk; |
| 571 | } |
| 572 | |
| 573 | opt = np->opt; |
| 574 | |
| 575 | if (sk_acceptq_is_full(sk)) |
| 576 | goto out_overflow; |
| 577 | |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 578 | if (np->rxopt.bits.osrcrt == 2 && opt == NULL && ireq6->pktopts) { |
| 579 | const struct inet6_skb_parm *rxopt = IP6CB(ireq6->pktopts); |
| 580 | |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 581 | if (rxopt->srcrt) |
| 582 | opt = ipv6_invert_rthdr(sk, |
| 583 | (struct ipv6_rt_hdr *)(ireq6->pktopts->nh.raw + |
| 584 | rxopt->srcrt)); |
| 585 | } |
| 586 | |
| 587 | if (dst == NULL) { |
| 588 | struct in6_addr *final_p = NULL, final; |
| 589 | struct flowi fl; |
| 590 | |
| 591 | memset(&fl, 0, sizeof(fl)); |
| 592 | fl.proto = IPPROTO_DCCP; |
| 593 | ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr); |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 594 | if (opt != NULL && opt->srcrt != NULL) { |
| 595 | const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt; |
| 596 | |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 597 | ipv6_addr_copy(&final, &fl.fl6_dst); |
| 598 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); |
| 599 | final_p = &final; |
| 600 | } |
| 601 | ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr); |
| 602 | fl.oif = sk->sk_bound_dev_if; |
| 603 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; |
| 604 | fl.fl_ip_sport = inet_sk(sk)->sport; |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 605 | security_sk_classify_flow(sk, &fl); |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 606 | |
| 607 | if (ip6_dst_lookup(sk, &dst, &fl)) |
| 608 | goto out; |
| 609 | |
| 610 | if (final_p) |
| 611 | ipv6_addr_copy(&fl.fl6_dst, final_p); |
| 612 | |
| 613 | if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0) |
| 614 | goto out; |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 615 | } |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 616 | |
| 617 | newsk = dccp_create_openreq_child(sk, req, skb); |
| 618 | if (newsk == NULL) |
| 619 | goto out; |
| 620 | |
| 621 | /* |
| 622 | * No need to charge this sock to the relevant IPv6 refcnt debug socks |
| 623 | * count here, dccp_create_openreq_child now does this for us, see the |
| 624 | * comment in that function for the gory details. -acme |
| 625 | */ |
| 626 | |
YOSHIFUJI Hideaki | 8e1ef0a | 2006-08-29 17:15:09 -0700 | [diff] [blame] | 627 | __ip6_dst_store(newsk, dst, NULL, NULL); |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 628 | newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM | |
| 629 | NETIF_F_TSO); |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 630 | newdp6 = (struct dccp6_sock *)newsk; |
| 631 | newinet = inet_sk(newsk); |
| 632 | newinet->pinet6 = &newdp6->inet6; |
| 633 | newdp = dccp_sk(newsk); |
| 634 | newnp = inet6_sk(newsk); |
| 635 | |
| 636 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); |
| 637 | |
| 638 | ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr); |
| 639 | ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr); |
| 640 | ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr); |
| 641 | newsk->sk_bound_dev_if = ireq6->iif; |
| 642 | |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 643 | /* Now IPv6 options... |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 644 | |
| 645 | First: no IPv4 options. |
| 646 | */ |
| 647 | newinet->opt = NULL; |
| 648 | |
| 649 | /* Clone RX bits */ |
| 650 | newnp->rxopt.all = np->rxopt.all; |
| 651 | |
| 652 | /* Clone pktoptions received with SYN */ |
| 653 | newnp->pktoptions = NULL; |
| 654 | if (ireq6->pktopts != NULL) { |
| 655 | newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC); |
| 656 | kfree_skb(ireq6->pktopts); |
| 657 | ireq6->pktopts = NULL; |
| 658 | if (newnp->pktoptions) |
| 659 | skb_set_owner_r(newnp->pktoptions, newsk); |
| 660 | } |
| 661 | newnp->opt = NULL; |
| 662 | newnp->mcast_oif = inet6_iif(skb); |
| 663 | newnp->mcast_hops = skb->nh.ipv6h->hop_limit; |
| 664 | |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 665 | /* |
| 666 | * Clone native IPv6 options from listening socket (if any) |
| 667 | * |
| 668 | * Yes, keeping reference count would be much more clever, but we make |
| 669 | * one more one thing there: reattach optmem to newsk. |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 670 | */ |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 671 | if (opt != NULL) { |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 672 | newnp->opt = ipv6_dup_options(newsk, opt); |
| 673 | if (opt != np->opt) |
| 674 | sock_kfree_s(sk, opt, opt->tot_len); |
| 675 | } |
| 676 | |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 677 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 678 | if (newnp->opt != NULL) |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 679 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
| 680 | newnp->opt->opt_flen); |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 681 | |
| 682 | dccp_sync_mss(newsk, dst_mtu(dst)); |
| 683 | |
| 684 | newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6; |
| 685 | |
| 686 | __inet6_hash(&dccp_hashinfo, newsk); |
| 687 | inet_inherit_port(&dccp_hashinfo, sk, newsk); |
| 688 | |
| 689 | return newsk; |
| 690 | |
| 691 | out_overflow: |
| 692 | NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS); |
| 693 | out: |
| 694 | NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS); |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 695 | if (opt != NULL && opt != np->opt) |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 696 | sock_kfree_s(sk, opt, opt->tot_len); |
| 697 | dst_release(dst); |
| 698 | return NULL; |
| 699 | } |
| 700 | |
| 701 | /* The socket must have it's spinlock held when we get |
| 702 | * here. |
| 703 | * |
| 704 | * We have a potential double-lock case here, so even when |
| 705 | * doing backlog processing we use the BH locking scheme. |
| 706 | * This is because we cannot sleep with the original spinlock |
| 707 | * held. |
| 708 | */ |
| 709 | static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) |
| 710 | { |
| 711 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 712 | struct sk_buff *opt_skb = NULL; |
| 713 | |
| 714 | /* Imagine: socket is IPv6. IPv4 packet arrives, |
| 715 | goes to IPv4 receive handler and backlogged. |
| 716 | From backlog it always goes here. Kerboom... |
| 717 | Fortunately, dccp_rcv_established and rcv_established |
| 718 | handle them correctly, but it is not case with |
| 719 | dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK |
| 720 | */ |
| 721 | |
| 722 | if (skb->protocol == htons(ETH_P_IP)) |
| 723 | return dccp_v4_do_rcv(sk, skb); |
| 724 | |
Dmitry Mishin | fda9ef5 | 2006-08-31 15:28:39 -0700 | [diff] [blame] | 725 | if (sk_filter(sk, skb)) |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 726 | goto discard; |
| 727 | |
| 728 | /* |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 729 | * socket locking is here for SMP purposes as backlog rcv is currently |
| 730 | * called with bh processing disabled. |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 731 | */ |
| 732 | |
| 733 | /* Do Stevens' IPV6_PKTOPTIONS. |
| 734 | |
| 735 | Yes, guys, it is the only place in our code, where we |
| 736 | may make it not affecting IPv4. |
| 737 | The rest of code is protocol independent, |
| 738 | and I do not like idea to uglify IPv4. |
| 739 | |
| 740 | Actually, all the idea behind IPV6_PKTOPTIONS |
| 741 | looks not very well thought. For now we latch |
| 742 | options, received in the last packet, enqueued |
| 743 | by tcp. Feel free to propose better solution. |
| 744 | --ANK (980728) |
| 745 | */ |
| 746 | if (np->rxopt.all) |
Gerrit Renker | 89e7e57 | 2006-11-10 11:13:33 -0200 | [diff] [blame] | 747 | /* |
| 748 | * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below |
| 749 | * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example. |
| 750 | */ |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 751 | opt_skb = skb_clone(skb, GFP_ATOMIC); |
| 752 | |
| 753 | if (sk->sk_state == DCCP_OPEN) { /* Fast path */ |
| 754 | if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len)) |
| 755 | goto reset; |
David S. Miller | fd169f1 | 2006-10-20 19:44:17 -0700 | [diff] [blame] | 756 | if (opt_skb) { |
Gerrit Renker | 89e7e57 | 2006-11-10 11:13:33 -0200 | [diff] [blame] | 757 | /* XXX This is where we would goto ipv6_pktoptions. */ |
David S. Miller | fd169f1 | 2006-10-20 19:44:17 -0700 | [diff] [blame] | 758 | __kfree_skb(opt_skb); |
| 759 | } |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 760 | return 0; |
| 761 | } |
| 762 | |
Gerrit Renker | d83ca5a | 2006-11-10 16:29:14 -0200 | [diff] [blame^] | 763 | /* |
| 764 | * Step 3: Process LISTEN state |
| 765 | * If S.state == LISTEN, |
| 766 | * If P.type == Request or P contains a valid Init Cookie option, |
| 767 | * (* Must scan the packet's options to check for Init |
| 768 | * Cookies. Only Init Cookies are processed here, |
| 769 | * however; other options are processed in Step 8. This |
| 770 | * scan need only be performed if the endpoint uses Init |
| 771 | * Cookies *) |
| 772 | * (* Generate a new socket and switch to that socket *) |
| 773 | * Set S := new socket for this port pair |
| 774 | * S.state = RESPOND |
| 775 | * Choose S.ISS (initial seqno) or set from Init Cookies |
| 776 | * Initialize S.GAR := S.ISS |
| 777 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies |
| 778 | * Continue with S.state == RESPOND |
| 779 | * (* A Response packet will be generated in Step 11 *) |
| 780 | * Otherwise, |
| 781 | * Generate Reset(No Connection) unless P.type == Reset |
| 782 | * Drop packet and return |
| 783 | * |
| 784 | * NOTE: the check for the packet types is done in |
| 785 | * dccp_rcv_state_process |
| 786 | */ |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 787 | if (sk->sk_state == DCCP_LISTEN) { |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 788 | struct sock *nsk = dccp_v6_hnd_req(sk, skb); |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 789 | |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 790 | if (nsk == NULL) |
| 791 | goto discard; |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 792 | /* |
| 793 | * Queue it on the new socket if the new socket is active, |
| 794 | * otherwise we just shortcircuit this and continue with |
| 795 | * the new socket.. |
| 796 | */ |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 797 | if (nsk != sk) { |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 798 | if (dccp_child_process(sk, nsk, skb)) |
| 799 | goto reset; |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 800 | if (opt_skb != NULL) |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 801 | __kfree_skb(opt_skb); |
| 802 | return 0; |
| 803 | } |
| 804 | } |
| 805 | |
| 806 | if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len)) |
| 807 | goto reset; |
David S. Miller | fd169f1 | 2006-10-20 19:44:17 -0700 | [diff] [blame] | 808 | if (opt_skb) { |
Gerrit Renker | 89e7e57 | 2006-11-10 11:13:33 -0200 | [diff] [blame] | 809 | /* XXX This is where we would goto ipv6_pktoptions. */ |
David S. Miller | fd169f1 | 2006-10-20 19:44:17 -0700 | [diff] [blame] | 810 | __kfree_skb(opt_skb); |
| 811 | } |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 812 | return 0; |
| 813 | |
| 814 | reset: |
| 815 | dccp_v6_ctl_send_reset(skb); |
| 816 | discard: |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 817 | if (opt_skb != NULL) |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 818 | __kfree_skb(opt_skb); |
| 819 | kfree_skb(skb); |
| 820 | return 0; |
| 821 | } |
| 822 | |
Patrick McHardy | 951dbc8 | 2006-01-06 23:02:34 -0800 | [diff] [blame] | 823 | static int dccp_v6_rcv(struct sk_buff **pskb) |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 824 | { |
| 825 | const struct dccp_hdr *dh; |
| 826 | struct sk_buff *skb = *pskb; |
| 827 | struct sock *sk; |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 828 | |
| 829 | /* Step 1: Check header basics: */ |
| 830 | |
| 831 | if (dccp_invalid_packet(skb)) |
| 832 | goto discard_it; |
| 833 | |
| 834 | dh = dccp_hdr(skb); |
| 835 | |
| 836 | DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(skb); |
| 837 | DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type; |
| 838 | |
| 839 | if (dccp_packet_without_ack(skb)) |
| 840 | DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ; |
| 841 | else |
| 842 | DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb); |
| 843 | |
| 844 | /* Step 2: |
| 845 | * Look up flow ID in table and get corresponding socket */ |
| 846 | sk = __inet6_lookup(&dccp_hashinfo, &skb->nh.ipv6h->saddr, |
| 847 | dh->dccph_sport, |
| 848 | &skb->nh.ipv6h->daddr, ntohs(dh->dccph_dport), |
| 849 | inet6_iif(skb)); |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 850 | /* |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 851 | * Step 2: |
| 852 | * If no socket ... |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 853 | */ |
Gerrit Renker | d23c710 | 2006-11-10 11:46:34 -0200 | [diff] [blame] | 854 | if (sk == NULL) { |
| 855 | dccp_pr_debug("failed to look up flow ID in table and " |
| 856 | "get corresponding socket\n"); |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 857 | goto no_dccp_socket; |
Gerrit Renker | d23c710 | 2006-11-10 11:46:34 -0200 | [diff] [blame] | 858 | } |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 859 | |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 860 | /* |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 861 | * Step 2: |
| 862 | * ... or S.state == TIMEWAIT, |
| 863 | * Generate Reset(No Connection) unless P.type == Reset |
| 864 | * Drop packet and return |
| 865 | */ |
Gerrit Renker | d23c710 | 2006-11-10 11:46:34 -0200 | [diff] [blame] | 866 | if (sk->sk_state == DCCP_TIME_WAIT) { |
| 867 | dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n"); |
| 868 | inet_twsk_put(inet_twsk(sk)); |
| 869 | goto no_dccp_socket; |
| 870 | } |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 871 | |
| 872 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
| 873 | goto discard_and_relse; |
| 874 | |
Arnaldo Carvalho de Melo | 25995ff | 2005-12-27 02:42:22 -0200 | [diff] [blame] | 875 | return sk_receive_skb(sk, skb) ? -1 : 0; |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 876 | |
| 877 | no_dccp_socket: |
| 878 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
| 879 | goto discard_it; |
| 880 | /* |
| 881 | * Step 2: |
Gerrit Renker | d83ca5a | 2006-11-10 16:29:14 -0200 | [diff] [blame^] | 882 | * If no socket ... |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 883 | * Generate Reset(No Connection) unless P.type == Reset |
| 884 | * Drop packet and return |
| 885 | */ |
| 886 | if (dh->dccph_type != DCCP_PKT_RESET) { |
| 887 | DCCP_SKB_CB(skb)->dccpd_reset_code = |
| 888 | DCCP_RESET_CODE_NO_CONNECTION; |
| 889 | dccp_v6_ctl_send_reset(skb); |
| 890 | } |
Gerrit Renker | d23c710 | 2006-11-10 11:46:34 -0200 | [diff] [blame] | 891 | |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 892 | discard_it: |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 893 | kfree_skb(skb); |
| 894 | return 0; |
| 895 | |
| 896 | discard_and_relse: |
| 897 | sock_put(sk); |
| 898 | goto discard_it; |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 899 | } |
| 900 | |
Gerrit Renker | 73c9e02 | 2006-11-10 13:01:31 -0200 | [diff] [blame] | 901 | static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
| 902 | int addr_len) |
| 903 | { |
| 904 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr; |
| 905 | struct inet_connection_sock *icsk = inet_csk(sk); |
| 906 | struct inet_sock *inet = inet_sk(sk); |
| 907 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 908 | struct dccp_sock *dp = dccp_sk(sk); |
| 909 | struct in6_addr *saddr = NULL, *final_p = NULL, final; |
| 910 | struct flowi fl; |
| 911 | struct dst_entry *dst; |
| 912 | int addr_type; |
| 913 | int err; |
| 914 | |
| 915 | dp->dccps_role = DCCP_ROLE_CLIENT; |
| 916 | |
| 917 | if (addr_len < SIN6_LEN_RFC2133) |
| 918 | return -EINVAL; |
| 919 | |
| 920 | if (usin->sin6_family != AF_INET6) |
| 921 | return -EAFNOSUPPORT; |
| 922 | |
| 923 | memset(&fl, 0, sizeof(fl)); |
| 924 | |
| 925 | if (np->sndflow) { |
| 926 | fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK; |
| 927 | IP6_ECN_flow_init(fl.fl6_flowlabel); |
| 928 | if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) { |
| 929 | struct ip6_flowlabel *flowlabel; |
| 930 | flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); |
| 931 | if (flowlabel == NULL) |
| 932 | return -EINVAL; |
| 933 | ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); |
| 934 | fl6_sock_release(flowlabel); |
| 935 | } |
| 936 | } |
| 937 | /* |
| 938 | * connect() to INADDR_ANY means loopback (BSD'ism). |
| 939 | */ |
| 940 | if (ipv6_addr_any(&usin->sin6_addr)) |
| 941 | usin->sin6_addr.s6_addr[15] = 1; |
| 942 | |
| 943 | addr_type = ipv6_addr_type(&usin->sin6_addr); |
| 944 | |
| 945 | if (addr_type & IPV6_ADDR_MULTICAST) |
| 946 | return -ENETUNREACH; |
| 947 | |
| 948 | if (addr_type & IPV6_ADDR_LINKLOCAL) { |
| 949 | if (addr_len >= sizeof(struct sockaddr_in6) && |
| 950 | usin->sin6_scope_id) { |
| 951 | /* If interface is set while binding, indices |
| 952 | * must coincide. |
| 953 | */ |
| 954 | if (sk->sk_bound_dev_if && |
| 955 | sk->sk_bound_dev_if != usin->sin6_scope_id) |
| 956 | return -EINVAL; |
| 957 | |
| 958 | sk->sk_bound_dev_if = usin->sin6_scope_id; |
| 959 | } |
| 960 | |
| 961 | /* Connect to link-local address requires an interface */ |
| 962 | if (!sk->sk_bound_dev_if) |
| 963 | return -EINVAL; |
| 964 | } |
| 965 | |
| 966 | ipv6_addr_copy(&np->daddr, &usin->sin6_addr); |
| 967 | np->flow_label = fl.fl6_flowlabel; |
| 968 | |
| 969 | /* |
| 970 | * DCCP over IPv4 |
| 971 | */ |
| 972 | if (addr_type == IPV6_ADDR_MAPPED) { |
| 973 | u32 exthdrlen = icsk->icsk_ext_hdr_len; |
| 974 | struct sockaddr_in sin; |
| 975 | |
| 976 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); |
| 977 | |
| 978 | if (__ipv6_only_sock(sk)) |
| 979 | return -ENETUNREACH; |
| 980 | |
| 981 | sin.sin_family = AF_INET; |
| 982 | sin.sin_port = usin->sin6_port; |
| 983 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; |
| 984 | |
| 985 | icsk->icsk_af_ops = &dccp_ipv6_mapped; |
| 986 | sk->sk_backlog_rcv = dccp_v4_do_rcv; |
| 987 | |
| 988 | err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); |
| 989 | if (err) { |
| 990 | icsk->icsk_ext_hdr_len = exthdrlen; |
| 991 | icsk->icsk_af_ops = &dccp_ipv6_af_ops; |
| 992 | sk->sk_backlog_rcv = dccp_v6_do_rcv; |
| 993 | goto failure; |
| 994 | } else { |
| 995 | ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF), |
| 996 | inet->saddr); |
| 997 | ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF), |
| 998 | inet->rcv_saddr); |
| 999 | } |
| 1000 | |
| 1001 | return err; |
| 1002 | } |
| 1003 | |
| 1004 | if (!ipv6_addr_any(&np->rcv_saddr)) |
| 1005 | saddr = &np->rcv_saddr; |
| 1006 | |
| 1007 | fl.proto = IPPROTO_DCCP; |
| 1008 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); |
| 1009 | ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr); |
| 1010 | fl.oif = sk->sk_bound_dev_if; |
| 1011 | fl.fl_ip_dport = usin->sin6_port; |
| 1012 | fl.fl_ip_sport = inet->sport; |
| 1013 | security_sk_classify_flow(sk, &fl); |
| 1014 | |
| 1015 | if (np->opt != NULL && np->opt->srcrt != NULL) { |
| 1016 | const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; |
| 1017 | |
| 1018 | ipv6_addr_copy(&final, &fl.fl6_dst); |
| 1019 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); |
| 1020 | final_p = &final; |
| 1021 | } |
| 1022 | |
| 1023 | err = ip6_dst_lookup(sk, &dst, &fl); |
| 1024 | if (err) |
| 1025 | goto failure; |
| 1026 | |
| 1027 | if (final_p) |
| 1028 | ipv6_addr_copy(&fl.fl6_dst, final_p); |
| 1029 | |
| 1030 | err = xfrm_lookup(&dst, &fl, sk, 0); |
| 1031 | if (err < 0) |
| 1032 | goto failure; |
| 1033 | |
| 1034 | if (saddr == NULL) { |
| 1035 | saddr = &fl.fl6_src; |
| 1036 | ipv6_addr_copy(&np->rcv_saddr, saddr); |
| 1037 | } |
| 1038 | |
| 1039 | /* set the source address */ |
| 1040 | ipv6_addr_copy(&np->saddr, saddr); |
| 1041 | inet->rcv_saddr = LOOPBACK4_IPV6; |
| 1042 | |
| 1043 | __ip6_dst_store(sk, dst, NULL, NULL); |
| 1044 | |
| 1045 | icsk->icsk_ext_hdr_len = 0; |
| 1046 | if (np->opt != NULL) |
| 1047 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + |
| 1048 | np->opt->opt_nflen); |
| 1049 | |
| 1050 | inet->dport = usin->sin6_port; |
| 1051 | |
| 1052 | dccp_set_state(sk, DCCP_REQUESTING); |
| 1053 | err = inet6_hash_connect(&dccp_death_row, sk); |
| 1054 | if (err) |
| 1055 | goto late_failure; |
| 1056 | /* FIXME */ |
| 1057 | #if 0 |
| 1058 | dp->dccps_gar = secure_dccp_v6_sequence_number(np->saddr.s6_addr32, |
| 1059 | np->daddr.s6_addr32, |
| 1060 | inet->sport, |
| 1061 | inet->dport); |
| 1062 | #endif |
| 1063 | err = dccp_connect(sk); |
| 1064 | if (err) |
| 1065 | goto late_failure; |
| 1066 | |
| 1067 | return 0; |
| 1068 | |
| 1069 | late_failure: |
| 1070 | dccp_set_state(sk, DCCP_CLOSED); |
| 1071 | __sk_dst_reset(sk); |
| 1072 | failure: |
| 1073 | inet->dport = 0; |
| 1074 | sk->sk_route_caps = 0; |
| 1075 | return err; |
| 1076 | } |
| 1077 | |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 1078 | static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = { |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1079 | .queue_xmit = inet6_csk_xmit, |
| 1080 | .send_check = dccp_v6_send_check, |
| 1081 | .rebuild_header = inet6_sk_rebuild_header, |
| 1082 | .conn_request = dccp_v6_conn_request, |
| 1083 | .syn_recv_sock = dccp_v6_request_recv_sock, |
| 1084 | .net_header_len = sizeof(struct ipv6hdr), |
| 1085 | .setsockopt = ipv6_setsockopt, |
| 1086 | .getsockopt = ipv6_getsockopt, |
| 1087 | .addr2sockaddr = inet6_csk_addr2sockaddr, |
| 1088 | .sockaddr_len = sizeof(struct sockaddr_in6), |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1089 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1090 | .compat_setsockopt = compat_ipv6_setsockopt, |
| 1091 | .compat_getsockopt = compat_ipv6_getsockopt, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1092 | #endif |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 1093 | }; |
| 1094 | |
| 1095 | /* |
| 1096 | * DCCP over IPv4 via INET6 API |
| 1097 | */ |
| 1098 | static struct inet_connection_sock_af_ops dccp_ipv6_mapped = { |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1099 | .queue_xmit = ip_queue_xmit, |
| 1100 | .send_check = dccp_v4_send_check, |
| 1101 | .rebuild_header = inet_sk_rebuild_header, |
| 1102 | .conn_request = dccp_v6_conn_request, |
| 1103 | .syn_recv_sock = dccp_v6_request_recv_sock, |
| 1104 | .net_header_len = sizeof(struct iphdr), |
| 1105 | .setsockopt = ipv6_setsockopt, |
| 1106 | .getsockopt = ipv6_getsockopt, |
| 1107 | .addr2sockaddr = inet6_csk_addr2sockaddr, |
| 1108 | .sockaddr_len = sizeof(struct sockaddr_in6), |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1109 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1110 | .compat_setsockopt = compat_ipv6_setsockopt, |
| 1111 | .compat_getsockopt = compat_ipv6_getsockopt, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1112 | #endif |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 1113 | }; |
| 1114 | |
| 1115 | /* NOTE: A lot of things set to zero explicitly by call to |
| 1116 | * sk_alloc() so need not be done here. |
| 1117 | */ |
| 1118 | static int dccp_v6_init_sock(struct sock *sk) |
| 1119 | { |
Arnaldo Carvalho de Melo | 7247887 | 2006-03-20 22:00:37 -0800 | [diff] [blame] | 1120 | static __u8 dccp_v6_ctl_sock_initialized; |
| 1121 | int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized); |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 1122 | |
Arnaldo Carvalho de Melo | 7247887 | 2006-03-20 22:00:37 -0800 | [diff] [blame] | 1123 | if (err == 0) { |
| 1124 | if (unlikely(!dccp_v6_ctl_sock_initialized)) |
| 1125 | dccp_v6_ctl_sock_initialized = 1; |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 1126 | inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops; |
Arnaldo Carvalho de Melo | 7247887 | 2006-03-20 22:00:37 -0800 | [diff] [blame] | 1127 | } |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 1128 | |
| 1129 | return err; |
| 1130 | } |
| 1131 | |
| 1132 | static int dccp_v6_destroy_sock(struct sock *sk) |
| 1133 | { |
Arnaldo Carvalho de Melo | 3e0fadc | 2006-03-20 21:23:15 -0800 | [diff] [blame] | 1134 | dccp_destroy_sock(sk); |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 1135 | return inet6_destroy_sock(sk); |
| 1136 | } |
| 1137 | |
Gerrit Renker | 73c9e02 | 2006-11-10 13:01:31 -0200 | [diff] [blame] | 1138 | static struct timewait_sock_ops dccp6_timewait_sock_ops = { |
| 1139 | .twsk_obj_size = sizeof(struct dccp6_timewait_sock), |
| 1140 | }; |
| 1141 | |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 1142 | static struct proto dccp_v6_prot = { |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1143 | .name = "DCCPv6", |
| 1144 | .owner = THIS_MODULE, |
| 1145 | .close = dccp_close, |
| 1146 | .connect = dccp_v6_connect, |
| 1147 | .disconnect = dccp_disconnect, |
| 1148 | .ioctl = dccp_ioctl, |
| 1149 | .init = dccp_v6_init_sock, |
| 1150 | .setsockopt = dccp_setsockopt, |
| 1151 | .getsockopt = dccp_getsockopt, |
| 1152 | .sendmsg = dccp_sendmsg, |
| 1153 | .recvmsg = dccp_recvmsg, |
| 1154 | .backlog_rcv = dccp_v6_do_rcv, |
| 1155 | .hash = dccp_v6_hash, |
| 1156 | .unhash = dccp_unhash, |
| 1157 | .accept = inet_csk_accept, |
| 1158 | .get_port = dccp_v6_get_port, |
| 1159 | .shutdown = dccp_shutdown, |
| 1160 | .destroy = dccp_v6_destroy_sock, |
| 1161 | .orphan_count = &dccp_orphan_count, |
| 1162 | .max_header = MAX_DCCP_HEADER, |
| 1163 | .obj_size = sizeof(struct dccp6_sock), |
| 1164 | .rsk_prot = &dccp6_request_sock_ops, |
| 1165 | .twsk_prot = &dccp6_timewait_sock_ops, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1166 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1167 | .compat_setsockopt = compat_dccp_setsockopt, |
| 1168 | .compat_getsockopt = compat_dccp_getsockopt, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1169 | #endif |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 1170 | }; |
| 1171 | |
| 1172 | static struct inet6_protocol dccp_v6_protocol = { |
Arnaldo Carvalho de Melo | 45329e7 | 2006-03-20 22:01:29 -0800 | [diff] [blame] | 1173 | .handler = dccp_v6_rcv, |
| 1174 | .err_handler = dccp_v6_err, |
| 1175 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 1176 | }; |
| 1177 | |
| 1178 | static struct proto_ops inet6_dccp_ops = { |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1179 | .family = PF_INET6, |
| 1180 | .owner = THIS_MODULE, |
| 1181 | .release = inet6_release, |
| 1182 | .bind = inet6_bind, |
| 1183 | .connect = inet_stream_connect, |
| 1184 | .socketpair = sock_no_socketpair, |
| 1185 | .accept = inet_accept, |
| 1186 | .getname = inet6_getname, |
| 1187 | .poll = dccp_poll, |
| 1188 | .ioctl = inet6_ioctl, |
| 1189 | .listen = inet_dccp_listen, |
| 1190 | .shutdown = inet_shutdown, |
| 1191 | .setsockopt = sock_common_setsockopt, |
| 1192 | .getsockopt = sock_common_getsockopt, |
| 1193 | .sendmsg = inet_sendmsg, |
| 1194 | .recvmsg = sock_common_recvmsg, |
| 1195 | .mmap = sock_no_mmap, |
| 1196 | .sendpage = sock_no_sendpage, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1197 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1198 | .compat_setsockopt = compat_sock_common_setsockopt, |
| 1199 | .compat_getsockopt = compat_sock_common_getsockopt, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1200 | #endif |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 1201 | }; |
| 1202 | |
| 1203 | static struct inet_protosw dccp_v6_protosw = { |
| 1204 | .type = SOCK_DCCP, |
| 1205 | .protocol = IPPROTO_DCCP, |
| 1206 | .prot = &dccp_v6_prot, |
| 1207 | .ops = &inet6_dccp_ops, |
| 1208 | .capability = -1, |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 1209 | .flags = INET_PROTOSW_ICSK, |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 1210 | }; |
| 1211 | |
| 1212 | static int __init dccp_v6_init(void) |
| 1213 | { |
| 1214 | int err = proto_register(&dccp_v6_prot, 1); |
| 1215 | |
| 1216 | if (err != 0) |
| 1217 | goto out; |
| 1218 | |
| 1219 | err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP); |
| 1220 | if (err != 0) |
| 1221 | goto out_unregister_proto; |
| 1222 | |
| 1223 | inet6_register_protosw(&dccp_v6_protosw); |
Arnaldo Carvalho de Melo | 7247887 | 2006-03-20 22:00:37 -0800 | [diff] [blame] | 1224 | |
Arnaldo Carvalho de Melo | c4d9390 | 2006-03-20 22:01:03 -0800 | [diff] [blame] | 1225 | err = inet_csk_ctl_sock_create(&dccp_v6_ctl_socket, PF_INET6, |
| 1226 | SOCK_DCCP, IPPROTO_DCCP); |
| 1227 | if (err != 0) |
Arnaldo Carvalho de Melo | 7247887 | 2006-03-20 22:00:37 -0800 | [diff] [blame] | 1228 | goto out_unregister_protosw; |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 1229 | out: |
| 1230 | return err; |
Arnaldo Carvalho de Melo | 7247887 | 2006-03-20 22:00:37 -0800 | [diff] [blame] | 1231 | out_unregister_protosw: |
| 1232 | inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); |
| 1233 | inet6_unregister_protosw(&dccp_v6_protosw); |
Arnaldo Carvalho de Melo | 3df80d9 | 2005-12-13 23:24:53 -0800 | [diff] [blame] | 1234 | out_unregister_proto: |
| 1235 | proto_unregister(&dccp_v6_prot); |
| 1236 | goto out; |
| 1237 | } |
| 1238 | |
| 1239 | static void __exit dccp_v6_exit(void) |
| 1240 | { |
| 1241 | inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); |
| 1242 | inet6_unregister_protosw(&dccp_v6_protosw); |
| 1243 | proto_unregister(&dccp_v6_prot); |
| 1244 | } |
| 1245 | |
| 1246 | module_init(dccp_v6_init); |
| 1247 | module_exit(dccp_v6_exit); |
| 1248 | |
| 1249 | /* |
| 1250 | * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) |
| 1251 | * values directly, Also cover the case where the protocol is not specified, |
| 1252 | * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP |
| 1253 | */ |
| 1254 | MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-33-type-6"); |
| 1255 | MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-0-type-6"); |
| 1256 | MODULE_LICENSE("GPL"); |
| 1257 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>"); |
| 1258 | MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol"); |