inet6_connection_sock.c revision 35ad9b9cf7d8a2e6259a0d24022e910adb6f3489
18129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo/* 28129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo * INET An implementation of the TCP/IP protocol suite for the LINUX 38129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo * operating system. INET is implemented using the BSD Socket 48129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo * interface as the means of communication with the user level. 58129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo * 68129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo * Support for INET6 connection oriented protocols. 78129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo * 88129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo * Authors: See the TCPv6 sources 98129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo * 108129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo * This program is free software; you can redistribute it and/or 118129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo * modify it under the terms of the GNU General Public License 128129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo * as published by the Free Software Foundation; either version 138129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo * 2 of the License, or(at your option) any later version. 148129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo */ 158129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo 168129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo#include <linux/module.h> 178129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo#include <linux/in6.h> 188129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo#include <linux/ipv6.h> 198129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo#include <linux/jhash.h> 205a0e3ad6af8660be21ca98a971cd00f331318c05Tejun Heo#include <linux/slab.h> 218129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo 228129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo#include <net/addrconf.h> 238129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo#include <net/inet_connection_sock.h> 24b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo#include <net/inet_ecn.h> 25b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo#include <net/inet_hashtables.h> 26b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo#include <net/ip6_route.h> 278129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo#include <net/sock.h> 289f5336e21893fafd232a9a02cfa7588ad153889aAdrian Bunk#include <net/inet6_connection_sock.h> 298129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo 30b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Meloint inet6_csk_bind_conflict(const struct sock *sk, 31aacd9289af8b82f5fb01bcdd53d0e3406d1333c7Alex Copot const struct inet_bind_bucket *tb, bool relax) 32b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo{ 33b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo const struct sock *sk2; 34b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo const struct hlist_node *node; 35b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo 36b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo /* We must walk the whole port owner list in this case. -DaveM */ 377477fd2e6b676fcd15861c2a96a7172f71afe0a5Pavel Emelyanov /* 387477fd2e6b676fcd15861c2a96a7172f71afe0a5Pavel Emelyanov * See comment in inet_csk_bind_conflict about sock lookup 397477fd2e6b676fcd15861c2a96a7172f71afe0a5Pavel Emelyanov * vs net namespaces issues. 407477fd2e6b676fcd15861c2a96a7172f71afe0a5Pavel Emelyanov */ 41b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo sk_for_each_bound(sk2, node, &tb->owners) { 42b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo if (sk != sk2 && 43b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo (!sk->sk_bound_dev_if || 44b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo !sk2->sk_bound_dev_if || 458d238b25b1ec22a73b1c2206f111df2faaff8285David S. Miller sk->sk_bound_dev_if == sk2->sk_bound_dev_if) && 468d238b25b1ec22a73b1c2206f111df2faaff8285David S. Miller (!sk->sk_reuse || !sk2->sk_reuse || 473e8c806a08c7beecd972e7ce15c570b9aba64baaDavid S. Miller sk2->sk_state == TCP_LISTEN) && 488d238b25b1ec22a73b1c2206f111df2faaff8285David S. Miller ipv6_rcv_saddr_equal(sk, sk2)) 498d238b25b1ec22a73b1c2206f111df2faaff8285David S. Miller break; 50b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo } 51b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo 52b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo return node != NULL; 53b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo} 54b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo 55b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de MeloEXPORT_SYMBOL_GPL(inet6_csk_bind_conflict); 56b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo 57ae4694b2d3e4c0f47c0e804a68417be57e5daf85David S. Millerstruct dst_entry *inet6_csk_route_req(struct sock *sk, 583840a06e6046aaee95f33a120499d2dc8c054b9dNeal Cardwell struct flowi6 *fl6, 59ae4694b2d3e4c0f47c0e804a68417be57e5daf85David S. Miller const struct request_sock *req) 60ae4694b2d3e4c0f47c0e804a68417be57e5daf85David S. Miller{ 61ae4694b2d3e4c0f47c0e804a68417be57e5daf85David S. Miller struct inet6_request_sock *treq = inet6_rsk(req); 62ae4694b2d3e4c0f47c0e804a68417be57e5daf85David S. Miller struct ipv6_pinfo *np = inet6_sk(sk); 63ae4694b2d3e4c0f47c0e804a68417be57e5daf85David S. Miller struct in6_addr *final_p, final; 64ae4694b2d3e4c0f47c0e804a68417be57e5daf85David S. Miller struct dst_entry *dst; 654c9483b2fb5d2548c3cc1fe03cdd4484ceeb5d1cDavid S. Miller 663840a06e6046aaee95f33a120499d2dc8c054b9dNeal Cardwell memset(fl6, 0, sizeof(*fl6)); 673840a06e6046aaee95f33a120499d2dc8c054b9dNeal Cardwell fl6->flowi6_proto = IPPROTO_TCP; 683840a06e6046aaee95f33a120499d2dc8c054b9dNeal Cardwell fl6->daddr = treq->rmt_addr; 693840a06e6046aaee95f33a120499d2dc8c054b9dNeal Cardwell final_p = fl6_update_dst(fl6, np->opt, &final); 703840a06e6046aaee95f33a120499d2dc8c054b9dNeal Cardwell fl6->saddr = treq->loc_addr; 713840a06e6046aaee95f33a120499d2dc8c054b9dNeal Cardwell fl6->flowi6_oif = treq->iif; 723840a06e6046aaee95f33a120499d2dc8c054b9dNeal Cardwell fl6->flowi6_mark = sk->sk_mark; 733840a06e6046aaee95f33a120499d2dc8c054b9dNeal Cardwell fl6->fl6_dport = inet_rsk(req)->rmt_port; 743840a06e6046aaee95f33a120499d2dc8c054b9dNeal Cardwell fl6->fl6_sport = inet_rsk(req)->loc_port; 753840a06e6046aaee95f33a120499d2dc8c054b9dNeal Cardwell security_req_classify_flow(req, flowi6_to_flowi(fl6)); 764c9483b2fb5d2548c3cc1fe03cdd4484ceeb5d1cDavid S. Miller 773840a06e6046aaee95f33a120499d2dc8c054b9dNeal Cardwell dst = ip6_dst_lookup_flow(sk, fl6, final_p, false); 7868d0c6d34d586a893292d4fb633a3bf8c547b222David S. Miller if (IS_ERR(dst)) 79ae4694b2d3e4c0f47c0e804a68417be57e5daf85David S. Miller return NULL; 80ae4694b2d3e4c0f47c0e804a68417be57e5daf85David S. Miller 81ae4694b2d3e4c0f47c0e804a68417be57e5daf85David S. Miller return dst; 82ae4694b2d3e4c0f47c0e804a68417be57e5daf85David S. Miller} 83ae4694b2d3e4c0f47c0e804a68417be57e5daf85David S. Miller 848129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo/* 858129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo * request_sock (formerly open request) hash tables. 868129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo */ 87fede70b9862635ab1bed84ab3d765e9069616b02Al Virostatic u32 inet6_synq_hash(const struct in6_addr *raddr, const __be16 rport, 88c16a98ed91597b40b22b540c6517103497ef8e74Eric Dumazet const u32 rnd, const u32 synq_hsize) 898129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo{ 9082a39eb6b3829a02e235656feddb4542517fcabcJozsef Kadlecsik u32 c; 918129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo 9282a39eb6b3829a02e235656feddb4542517fcabcJozsef Kadlecsik c = jhash_3words((__force u32)raddr->s6_addr32[0], 9382a39eb6b3829a02e235656feddb4542517fcabcJozsef Kadlecsik (__force u32)raddr->s6_addr32[1], 9482a39eb6b3829a02e235656feddb4542517fcabcJozsef Kadlecsik (__force u32)raddr->s6_addr32[2], 9582a39eb6b3829a02e235656feddb4542517fcabcJozsef Kadlecsik rnd); 968129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo 9782a39eb6b3829a02e235656feddb4542517fcabcJozsef Kadlecsik c = jhash_2words((__force u32)raddr->s6_addr32[3], 9882a39eb6b3829a02e235656feddb4542517fcabcJozsef Kadlecsik (__force u32)rport, 9982a39eb6b3829a02e235656feddb4542517fcabcJozsef Kadlecsik c); 1008129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo 1018129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo return c & (synq_hsize - 1); 1028129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo} 1038129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo 1048129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melostruct request_sock *inet6_csk_search_req(const struct sock *sk, 1058129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo struct request_sock ***prevp, 106fede70b9862635ab1bed84ab3d765e9069616b02Al Viro const __be16 rport, 1078129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo const struct in6_addr *raddr, 1088129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo const struct in6_addr *laddr, 1098129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo const int iif) 1108129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo{ 1118129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo const struct inet_connection_sock *icsk = inet_csk(sk); 1128129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; 1138129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo struct request_sock *req, **prev; 1148129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo 1158129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo for (prev = &lopt->syn_table[inet6_synq_hash(raddr, rport, 1168129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo lopt->hash_rnd, 1178129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo lopt->nr_table_entries)]; 1188129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo (req = *prev) != NULL; 1198129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo prev = &req->dl_next) { 120ca304b6104ffdd120bb6687a88a0625e58bc71cdArnaldo Carvalho de Melo const struct inet6_request_sock *treq = inet6_rsk(req); 1218129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo 1228129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo if (inet_rsk(req)->rmt_port == rport && 1238129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo req->rsk_ops->family == AF_INET6 && 1248129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo ipv6_addr_equal(&treq->rmt_addr, raddr) && 1258129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo ipv6_addr_equal(&treq->loc_addr, laddr) && 1268129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo (!treq->iif || treq->iif == iif)) { 127547b792cac0a038b9dbf958d3c120df3740b5572Ilpo Järvinen WARN_ON(req->sk != NULL); 1288129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo *prevp = prev; 1298129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo return req; 1308129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo } 1318129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo } 1328129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo 1338129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo return NULL; 1348129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo} 1358129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo 1368129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de MeloEXPORT_SYMBOL_GPL(inet6_csk_search_req); 1378129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo 1388129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melovoid inet6_csk_reqsk_queue_hash_add(struct sock *sk, 1398129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo struct request_sock *req, 1408129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo const unsigned long timeout) 1418129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo{ 1428129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo struct inet_connection_sock *icsk = inet_csk(sk); 1438129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; 144ca304b6104ffdd120bb6687a88a0625e58bc71cdArnaldo Carvalho de Melo const u32 h = inet6_synq_hash(&inet6_rsk(req)->rmt_addr, 1458129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo inet_rsk(req)->rmt_port, 1468129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo lopt->hash_rnd, lopt->nr_table_entries); 1478129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo 1488129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout); 1498129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo inet_csk_reqsk_queue_added(sk, timeout); 1508129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo} 1518129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de Melo 1528129765ac07c2455c927051e3a8b048b619b56eeArnaldo Carvalho de MeloEXPORT_SYMBOL_GPL(inet6_csk_reqsk_queue_hash_add); 153b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo 154b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melovoid inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr * uaddr) 155b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo{ 156b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo struct ipv6_pinfo *np = inet6_sk(sk); 157b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr; 158b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo 159b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo sin6->sin6_family = AF_INET6; 1604e3fd7a06dc20b2d8ec6892233ad2012968fe7b6Alexey Dobriyan sin6->sin6_addr = np->daddr; 161c720c7e8383aff1cb219bddf474ed89d850336e3Eric Dumazet sin6->sin6_port = inet_sk(sk)->inet_dport; 162b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo /* We do not store received flowlabel for TCP */ 163b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo sin6->sin6_flowinfo = 0; 164b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo sin6->sin6_scope_id = 0; 165b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo if (sk->sk_bound_dev_if && 166b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 167b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo sin6->sin6_scope_id = sk->sk_bound_dev_if; 168b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo} 169b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo 170b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de MeloEXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr); 171b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo 172a47ed4cd8cb0709723392f5b841e9015f765d0a6Noriaki TAKAMIYAstatic inline 173a47ed4cd8cb0709723392f5b841e9015f765d0a6Noriaki TAKAMIYAvoid __inet6_csk_dst_store(struct sock *sk, struct dst_entry *dst, 174a47ed4cd8cb0709723392f5b841e9015f765d0a6Noriaki TAKAMIYA struct in6_addr *daddr, struct in6_addr *saddr) 175a47ed4cd8cb0709723392f5b841e9015f765d0a6Noriaki TAKAMIYA{ 176a47ed4cd8cb0709723392f5b841e9015f765d0a6Noriaki TAKAMIYA __ip6_dst_store(sk, dst, daddr, saddr); 177a47ed4cd8cb0709723392f5b841e9015f765d0a6Noriaki TAKAMIYA 178a47ed4cd8cb0709723392f5b841e9015f765d0a6Noriaki TAKAMIYA#ifdef CONFIG_XFRM 1791dff92e09eb3adfcf3d3dffd0507b850f911f280Adrian Bunk { 180a47ed4cd8cb0709723392f5b841e9015f765d0a6Noriaki TAKAMIYA struct rt6_info *rt = (struct rt6_info *)dst; 181a47ed4cd8cb0709723392f5b841e9015f765d0a6Noriaki TAKAMIYA rt->rt6i_flow_cache_genid = atomic_read(&flow_cache_genid); 182a47ed4cd8cb0709723392f5b841e9015f765d0a6Noriaki TAKAMIYA } 183a47ed4cd8cb0709723392f5b841e9015f765d0a6Noriaki TAKAMIYA#endif 184a47ed4cd8cb0709723392f5b841e9015f765d0a6Noriaki TAKAMIYA} 185a47ed4cd8cb0709723392f5b841e9015f765d0a6Noriaki TAKAMIYA 186a47ed4cd8cb0709723392f5b841e9015f765d0a6Noriaki TAKAMIYAstatic inline 187a47ed4cd8cb0709723392f5b841e9015f765d0a6Noriaki TAKAMIYAstruct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie) 188a47ed4cd8cb0709723392f5b841e9015f765d0a6Noriaki TAKAMIYA{ 189a47ed4cd8cb0709723392f5b841e9015f765d0a6Noriaki TAKAMIYA struct dst_entry *dst; 190a47ed4cd8cb0709723392f5b841e9015f765d0a6Noriaki TAKAMIYA 191a47ed4cd8cb0709723392f5b841e9015f765d0a6Noriaki TAKAMIYA dst = __sk_dst_check(sk, cookie); 192a47ed4cd8cb0709723392f5b841e9015f765d0a6Noriaki TAKAMIYA 193a47ed4cd8cb0709723392f5b841e9015f765d0a6Noriaki TAKAMIYA#ifdef CONFIG_XFRM 194a47ed4cd8cb0709723392f5b841e9015f765d0a6Noriaki TAKAMIYA if (dst) { 195a47ed4cd8cb0709723392f5b841e9015f765d0a6Noriaki TAKAMIYA struct rt6_info *rt = (struct rt6_info *)dst; 196a47ed4cd8cb0709723392f5b841e9015f765d0a6Noriaki TAKAMIYA if (rt->rt6i_flow_cache_genid != atomic_read(&flow_cache_genid)) { 197f04c8276248d3dd3e15a9a72f9711ba5e4069049Krishna Kumar __sk_dst_reset(sk); 198a47ed4cd8cb0709723392f5b841e9015f765d0a6Noriaki TAKAMIYA dst = NULL; 199a47ed4cd8cb0709723392f5b841e9015f765d0a6Noriaki TAKAMIYA } 200a47ed4cd8cb0709723392f5b841e9015f765d0a6Noriaki TAKAMIYA } 201a47ed4cd8cb0709723392f5b841e9015f765d0a6Noriaki TAKAMIYA#endif 202a47ed4cd8cb0709723392f5b841e9015f765d0a6Noriaki TAKAMIYA 203a47ed4cd8cb0709723392f5b841e9015f765d0a6Noriaki TAKAMIYA return dst; 204a47ed4cd8cb0709723392f5b841e9015f765d0a6Noriaki TAKAMIYA} 205a47ed4cd8cb0709723392f5b841e9015f765d0a6Noriaki TAKAMIYA 20635ad9b9cf7d8a2e6259a0d24022e910adb6f3489David S. Millerstatic struct dst_entry *inet6_csk_route_socket(struct sock *sk) 207b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo{ 208b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo struct inet_sock *inet = inet_sk(sk); 209b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo struct ipv6_pinfo *np = inet6_sk(sk); 21020c59de2e6b6bc74bbf714dcd4e720afe8d516cfArnaud Ebalard struct in6_addr *final_p, final; 21135ad9b9cf7d8a2e6259a0d24022e910adb6f3489David S. Miller struct dst_entry *dst; 21235ad9b9cf7d8a2e6259a0d24022e910adb6f3489David S. Miller struct flowi6 fl6; 213b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo 2144c9483b2fb5d2548c3cc1fe03cdd4484ceeb5d1cDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 2154c9483b2fb5d2548c3cc1fe03cdd4484ceeb5d1cDavid S. Miller fl6.flowi6_proto = sk->sk_protocol; 2164e3fd7a06dc20b2d8ec6892233ad2012968fe7b6Alexey Dobriyan fl6.daddr = np->daddr; 2174e3fd7a06dc20b2d8ec6892233ad2012968fe7b6Alexey Dobriyan fl6.saddr = np->saddr; 2184c9483b2fb5d2548c3cc1fe03cdd4484ceeb5d1cDavid S. Miller fl6.flowlabel = np->flow_label; 2194c9483b2fb5d2548c3cc1fe03cdd4484ceeb5d1cDavid S. Miller IP6_ECN_flow_xmit(sk, fl6.flowlabel); 2204c9483b2fb5d2548c3cc1fe03cdd4484ceeb5d1cDavid S. Miller fl6.flowi6_oif = sk->sk_bound_dev_if; 2214c9483b2fb5d2548c3cc1fe03cdd4484ceeb5d1cDavid S. Miller fl6.flowi6_mark = sk->sk_mark; 2221958b856c1a59c0f1e892b92debb8c9fe4f364dcDavid S. Miller fl6.fl6_sport = inet->inet_sport; 2231958b856c1a59c0f1e892b92debb8c9fe4f364dcDavid S. Miller fl6.fl6_dport = inet->inet_dport; 2244c9483b2fb5d2548c3cc1fe03cdd4484ceeb5d1cDavid S. Miller security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 225b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo 2264c9483b2fb5d2548c3cc1fe03cdd4484ceeb5d1cDavid S. Miller final_p = fl6_update_dst(&fl6, np->opt, &final); 227b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo 228a47ed4cd8cb0709723392f5b841e9015f765d0a6Noriaki TAKAMIYA dst = __inet6_csk_dst_check(sk, np->dst_cookie); 22935ad9b9cf7d8a2e6259a0d24022e910adb6f3489David S. Miller if (!dst) { 2304c9483b2fb5d2548c3cc1fe03cdd4484ceeb5d1cDavid S. Miller dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false); 231b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo 23235ad9b9cf7d8a2e6259a0d24022e910adb6f3489David S. Miller if (!IS_ERR(dst)) 23335ad9b9cf7d8a2e6259a0d24022e910adb6f3489David S. Miller __inet6_csk_dst_store(sk, dst, NULL, NULL); 23435ad9b9cf7d8a2e6259a0d24022e910adb6f3489David S. Miller } 23535ad9b9cf7d8a2e6259a0d24022e910adb6f3489David S. Miller return dst; 23635ad9b9cf7d8a2e6259a0d24022e910adb6f3489David S. Miller} 237b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo 23835ad9b9cf7d8a2e6259a0d24022e910adb6f3489David S. Millerint inet6_csk_xmit(struct sk_buff *skb, struct flowi *fl_unused) 23935ad9b9cf7d8a2e6259a0d24022e910adb6f3489David S. Miller{ 24035ad9b9cf7d8a2e6259a0d24022e910adb6f3489David S. Miller struct sock *sk = skb->sk; 24135ad9b9cf7d8a2e6259a0d24022e910adb6f3489David S. Miller struct ipv6_pinfo *np = inet6_sk(sk); 24235ad9b9cf7d8a2e6259a0d24022e910adb6f3489David S. Miller struct flowi6 fl6; 24335ad9b9cf7d8a2e6259a0d24022e910adb6f3489David S. Miller struct dst_entry *dst; 24435ad9b9cf7d8a2e6259a0d24022e910adb6f3489David S. Miller int res; 24535ad9b9cf7d8a2e6259a0d24022e910adb6f3489David S. Miller 24635ad9b9cf7d8a2e6259a0d24022e910adb6f3489David S. Miller dst = inet6_csk_route_socket(sk); 24735ad9b9cf7d8a2e6259a0d24022e910adb6f3489David S. Miller if (IS_ERR(dst)) { 24835ad9b9cf7d8a2e6259a0d24022e910adb6f3489David S. Miller sk->sk_err_soft = -PTR_ERR(dst); 24935ad9b9cf7d8a2e6259a0d24022e910adb6f3489David S. Miller sk->sk_route_caps = 0; 25035ad9b9cf7d8a2e6259a0d24022e910adb6f3489David S. Miller kfree_skb(skb); 25135ad9b9cf7d8a2e6259a0d24022e910adb6f3489David S. Miller return PTR_ERR(dst); 252b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo } 253b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo 254d14730b8e9117c9b77aacd391c049b50163e9b61Eric Dumazet rcu_read_lock(); 255d14730b8e9117c9b77aacd391c049b50163e9b61Eric Dumazet skb_dst_set_noref(skb, dst); 256b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo 257b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo /* Restore final destination back after routing done */ 2584e3fd7a06dc20b2d8ec6892233ad2012968fe7b6Alexey Dobriyan fl6.daddr = np->daddr; 259b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo 260b903d324bee2627036d024dceed73b3c96558795Eric Dumazet res = ip6_xmit(sk, skb, &fl6, np->opt, np->tclass); 261d14730b8e9117c9b77aacd391c049b50163e9b61Eric Dumazet rcu_read_unlock(); 262d14730b8e9117c9b77aacd391c049b50163e9b61Eric Dumazet return res; 263b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de Melo} 264b9750ce13c08aa8a71a9b138d741f3046aefd991Arnaldo Carvalho de MeloEXPORT_SYMBOL_GPL(inet6_csk_xmit); 26535ad9b9cf7d8a2e6259a0d24022e910adb6f3489David S. Miller 26635ad9b9cf7d8a2e6259a0d24022e910adb6f3489David S. Millerstruct dst_entry *inet6_csk_update_pmtu(struct sock *sk, u32 mtu) 26735ad9b9cf7d8a2e6259a0d24022e910adb6f3489David S. Miller{ 26835ad9b9cf7d8a2e6259a0d24022e910adb6f3489David S. Miller struct dst_entry *dst = inet6_csk_route_socket(sk); 26935ad9b9cf7d8a2e6259a0d24022e910adb6f3489David S. Miller 27035ad9b9cf7d8a2e6259a0d24022e910adb6f3489David S. Miller if (IS_ERR(dst)) 27135ad9b9cf7d8a2e6259a0d24022e910adb6f3489David S. Miller return NULL; 27235ad9b9cf7d8a2e6259a0d24022e910adb6f3489David S. Miller dst->ops->update_pmtu(dst, mtu); 27335ad9b9cf7d8a2e6259a0d24022e910adb6f3489David S. Miller 27435ad9b9cf7d8a2e6259a0d24022e910adb6f3489David S. Miller return inet6_csk_route_socket(sk); 27535ad9b9cf7d8a2e6259a0d24022e910adb6f3489David S. Miller} 27635ad9b9cf7d8a2e6259a0d24022e910adb6f3489David S. MillerEXPORT_SYMBOL_GPL(inet6_csk_update_pmtu); 277