12874c5fdSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 21da177e4SLinus Torvalds /* 31da177e4SLinus Torvalds * common UDP/RAW code 41da177e4SLinus Torvalds * Linux INET6 implementation 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Authors: 71da177e4SLinus Torvalds * Pedro Roque <roque@di.fc.ul.pt> 81da177e4SLinus Torvalds */ 91da177e4SLinus Torvalds 104fc268d2SRandy Dunlap #include <linux/capability.h> 111da177e4SLinus Torvalds #include <linux/errno.h> 121da177e4SLinus Torvalds #include <linux/types.h> 131da177e4SLinus Torvalds #include <linux/kernel.h> 141da177e4SLinus Torvalds #include <linux/interrupt.h> 151da177e4SLinus Torvalds #include <linux/socket.h> 161da177e4SLinus Torvalds #include <linux/sockios.h> 171da177e4SLinus Torvalds #include <linux/in6.h> 181da177e4SLinus Torvalds #include <linux/ipv6.h> 191da177e4SLinus Torvalds #include <linux/route.h> 205a0e3ad6STejun Heo #include <linux/slab.h> 21a495f836SChris Elston #include <linux/export.h> 2201370434SWillem de Bruijn #include <linux/icmp.h> 231da177e4SLinus Torvalds 241da177e4SLinus Torvalds #include <net/ipv6.h> 251da177e4SLinus Torvalds #include <net/ndisc.h> 261da177e4SLinus Torvalds #include <net/addrconf.h> 271da177e4SLinus Torvalds #include <net/transp_v6.h> 281da177e4SLinus Torvalds #include <net/ip6_route.h> 29c752f073SArnaldo Carvalho de Melo #include <net/tcp_states.h> 30e7219858SYOSHIFUJI Hideaki / 吉藤英明 #include <net/dsfield.h> 31acdcecc6SWillem de Bruijn #include <net/sock_reuseport.h> 321da177e4SLinus Torvalds 331da177e4SLinus Torvalds #include <linux/errqueue.h> 347c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 351da177e4SLinus Torvalds 36a50feda5SEric Dumazet static bool ipv6_mapped_addr_any(const struct in6_addr *a) 37c15fea2dSMax Matveev { 38a50feda5SEric Dumazet return ipv6_addr_v4mapped(a) && (a->s6_addr32[3] == 0); 39c15fea2dSMax Matveev } 40c15fea2dSMax Matveev 41*5bc67a85SGuillaume Nault static void ip6_datagram_flow_key_init(struct flowi6 *fl6, 42*5bc67a85SGuillaume Nault const struct sock *sk) 4380fbdb20SMartin KaFai Lau { 44*5bc67a85SGuillaume Nault const struct inet_sock *inet = inet_sk(sk); 45*5bc67a85SGuillaume Nault const struct ipv6_pinfo *np = inet6_sk(sk); 46526682b4SRichard Gobert int oif = sk->sk_bound_dev_if; 4780fbdb20SMartin KaFai Lau 4880fbdb20SMartin KaFai Lau memset(fl6, 0, sizeof(*fl6)); 4980fbdb20SMartin KaFai Lau fl6->flowi6_proto = sk->sk_protocol; 5080fbdb20SMartin KaFai Lau fl6->daddr = sk->sk_v6_daddr; 5180fbdb20SMartin KaFai Lau fl6->saddr = np->saddr; 5280fbdb20SMartin KaFai Lau fl6->flowi6_mark = sk->sk_mark; 5380fbdb20SMartin KaFai Lau fl6->fl6_dport = inet->inet_dport; 5480fbdb20SMartin KaFai Lau fl6->fl6_sport = inet->inet_sport; 55e010ae08SGuillaume Nault fl6->flowlabel = ip6_make_flowinfo(np->tclass, np->flow_label); 56e2d118a1SLorenzo Colitti fl6->flowi6_uid = sk->sk_uid; 5780fbdb20SMartin KaFai Lau 58526682b4SRichard Gobert if (!oif) 59526682b4SRichard Gobert oif = np->sticky_pktinfo.ipi6_ifindex; 6080fbdb20SMartin KaFai Lau 61526682b4SRichard Gobert if (!oif) { 62526682b4SRichard Gobert if (ipv6_addr_is_multicast(&fl6->daddr)) 63526682b4SRichard Gobert oif = np->mcast_oif; 64526682b4SRichard Gobert else 65526682b4SRichard Gobert oif = np->ucast_oif; 66526682b4SRichard Gobert } 6780fbdb20SMartin KaFai Lau 68526682b4SRichard Gobert fl6->flowi6_oif = oif; 693df98d79SPaul Moore security_sk_classify_flow(sk, flowi6_to_flowi_common(fl6)); 7080fbdb20SMartin KaFai Lau } 7180fbdb20SMartin KaFai Lau 7233c162a9SMartin KaFai Lau int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr) 737e2040dbSMartin KaFai Lau { 747e2040dbSMartin KaFai Lau struct ip6_flowlabel *flowlabel = NULL; 757e2040dbSMartin KaFai Lau struct in6_addr *final_p, final; 767e2040dbSMartin KaFai Lau struct ipv6_txoptions *opt; 777e2040dbSMartin KaFai Lau struct dst_entry *dst; 787e2040dbSMartin KaFai Lau struct inet_sock *inet = inet_sk(sk); 797e2040dbSMartin KaFai Lau struct ipv6_pinfo *np = inet6_sk(sk); 807e2040dbSMartin KaFai Lau struct flowi6 fl6; 817e2040dbSMartin KaFai Lau int err = 0; 827e2040dbSMartin KaFai Lau 837e2040dbSMartin KaFai Lau if (np->sndflow && (np->flow_label & IPV6_FLOWLABEL_MASK)) { 847e2040dbSMartin KaFai Lau flowlabel = fl6_sock_lookup(sk, np->flow_label); 858975a3abSEric Dumazet if (IS_ERR(flowlabel)) 867e2040dbSMartin KaFai Lau return -EINVAL; 877e2040dbSMartin KaFai Lau } 887e2040dbSMartin KaFai Lau ip6_datagram_flow_key_init(&fl6, sk); 897e2040dbSMartin KaFai Lau 907e2040dbSMartin KaFai Lau rcu_read_lock(); 917e2040dbSMartin KaFai Lau opt = flowlabel ? flowlabel->opt : rcu_dereference(np->opt); 927e2040dbSMartin KaFai Lau final_p = fl6_update_dst(&fl6, opt, &final); 937e2040dbSMartin KaFai Lau rcu_read_unlock(); 947e2040dbSMartin KaFai Lau 95c4e85f73SSabrina Dubroca dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p); 967e2040dbSMartin KaFai Lau if (IS_ERR(dst)) { 977e2040dbSMartin KaFai Lau err = PTR_ERR(dst); 987e2040dbSMartin KaFai Lau goto out; 997e2040dbSMartin KaFai Lau } 1007e2040dbSMartin KaFai Lau 10133c162a9SMartin KaFai Lau if (fix_sk_saddr) { 1027e2040dbSMartin KaFai Lau if (ipv6_addr_any(&np->saddr)) 1037e2040dbSMartin KaFai Lau np->saddr = fl6.saddr; 1047e2040dbSMartin KaFai Lau 1057e2040dbSMartin KaFai Lau if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { 1067e2040dbSMartin KaFai Lau sk->sk_v6_rcv_saddr = fl6.saddr; 1077e2040dbSMartin KaFai Lau inet->inet_rcv_saddr = LOOPBACK4_IPV6; 1087e2040dbSMartin KaFai Lau if (sk->sk_prot->rehash) 1097e2040dbSMartin KaFai Lau sk->sk_prot->rehash(sk); 1107e2040dbSMartin KaFai Lau } 11133c162a9SMartin KaFai Lau } 1127e2040dbSMartin KaFai Lau 1137d6850f7SAlexey Kodanev ip6_sk_dst_store_flow(sk, dst, &fl6); 1147e2040dbSMartin KaFai Lau 1157e2040dbSMartin KaFai Lau out: 1167e2040dbSMartin KaFai Lau fl6_sock_release(flowlabel); 1177e2040dbSMartin KaFai Lau return err; 1187e2040dbSMartin KaFai Lau } 1197e2040dbSMartin KaFai Lau 120e646b657SMartin KaFai Lau void ip6_datagram_release_cb(struct sock *sk) 121e646b657SMartin KaFai Lau { 122e646b657SMartin KaFai Lau struct dst_entry *dst; 123e646b657SMartin KaFai Lau 124e646b657SMartin KaFai Lau if (ipv6_addr_v4mapped(&sk->sk_v6_daddr)) 125e646b657SMartin KaFai Lau return; 126e646b657SMartin KaFai Lau 127e646b657SMartin KaFai Lau rcu_read_lock(); 128e646b657SMartin KaFai Lau dst = __sk_dst_get(sk); 129e646b657SMartin KaFai Lau if (!dst || !dst->obsolete || 130e646b657SMartin KaFai Lau dst->ops->check(dst, inet6_sk(sk)->dst_cookie)) { 131e646b657SMartin KaFai Lau rcu_read_unlock(); 132e646b657SMartin KaFai Lau return; 133e646b657SMartin KaFai Lau } 134e646b657SMartin KaFai Lau rcu_read_unlock(); 135e646b657SMartin KaFai Lau 136e646b657SMartin KaFai Lau ip6_datagram_dst_update(sk, false); 137e646b657SMartin KaFai Lau } 138e646b657SMartin KaFai Lau EXPORT_SYMBOL_GPL(ip6_datagram_release_cb); 139e646b657SMartin KaFai Lau 1400382a25aSGuillaume Nault int __ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, 1410382a25aSGuillaume Nault int addr_len) 1421da177e4SLinus Torvalds { 1431da177e4SLinus Torvalds struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; 1441da177e4SLinus Torvalds struct inet_sock *inet = inet_sk(sk); 1451da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 1462f987a76SPaolo Abeni struct in6_addr *daddr, old_daddr; 1472f987a76SPaolo Abeni __be32 fl6_flowlabel = 0; 1482f987a76SPaolo Abeni __be32 old_fl6_flowlabel; 1495f2fb802SStefano Brivio __be16 old_dport; 1501da177e4SLinus Torvalds int addr_type; 1511da177e4SLinus Torvalds int err; 1521da177e4SLinus Torvalds 1531da177e4SLinus Torvalds if (usin->sin6_family == AF_INET) { 15489e9c728SKuniyuki Iwashima if (ipv6_only_sock(sk)) 1551da177e4SLinus Torvalds return -EAFNOSUPPORT; 15603645a11SEric Dumazet err = __ip4_datagram_connect(sk, uaddr, addr_len); 1571da177e4SLinus Torvalds goto ipv4_connected; 1581da177e4SLinus Torvalds } 1591da177e4SLinus Torvalds 1601da177e4SLinus Torvalds if (addr_len < SIN6_LEN_RFC2133) 1611da177e4SLinus Torvalds return -EINVAL; 1621da177e4SLinus Torvalds 1631da177e4SLinus Torvalds if (usin->sin6_family != AF_INET6) 1641da177e4SLinus Torvalds return -EAFNOSUPPORT; 1651da177e4SLinus Torvalds 1667e2040dbSMartin KaFai Lau if (np->sndflow) 16780fbdb20SMartin KaFai Lau fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK; 1681da177e4SLinus Torvalds 169052d2369SJonathan T. Leighton if (ipv6_addr_any(&usin->sin6_addr)) { 1701da177e4SLinus Torvalds /* 1711da177e4SLinus Torvalds * connect to self 1721da177e4SLinus Torvalds */ 173052d2369SJonathan T. Leighton if (ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr)) 174052d2369SJonathan T. Leighton ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK), 175052d2369SJonathan T. Leighton &usin->sin6_addr); 176052d2369SJonathan T. Leighton else 177052d2369SJonathan T. Leighton usin->sin6_addr = in6addr_loopback; 1781da177e4SLinus Torvalds } 1791da177e4SLinus Torvalds 180052d2369SJonathan T. Leighton addr_type = ipv6_addr_type(&usin->sin6_addr); 181052d2369SJonathan T. Leighton 1821da177e4SLinus Torvalds daddr = &usin->sin6_addr; 1831da177e4SLinus Torvalds 184052d2369SJonathan T. Leighton if (addr_type & IPV6_ADDR_MAPPED) { 1851da177e4SLinus Torvalds struct sockaddr_in sin; 1861da177e4SLinus Torvalds 18789e9c728SKuniyuki Iwashima if (ipv6_only_sock(sk)) { 1881da177e4SLinus Torvalds err = -ENETUNREACH; 1891da177e4SLinus Torvalds goto out; 1901da177e4SLinus Torvalds } 1911da177e4SLinus Torvalds sin.sin_family = AF_INET; 1921da177e4SLinus Torvalds sin.sin_addr.s_addr = daddr->s6_addr32[3]; 1931da177e4SLinus Torvalds sin.sin_port = usin->sin6_port; 1941da177e4SLinus Torvalds 19503645a11SEric Dumazet err = __ip4_datagram_connect(sk, 1961da177e4SLinus Torvalds (struct sockaddr *) &sin, 1971da177e4SLinus Torvalds sizeof(sin)); 1981da177e4SLinus Torvalds 1991da177e4SLinus Torvalds ipv4_connected: 2001da177e4SLinus Torvalds if (err) 2011da177e4SLinus Torvalds goto out; 2021da177e4SLinus Torvalds 203efe4208fSEric Dumazet ipv6_addr_set_v4mapped(inet->inet_daddr, &sk->sk_v6_daddr); 2041da177e4SLinus Torvalds 205c15fea2dSMax Matveev if (ipv6_addr_any(&np->saddr) || 206c15fea2dSMax Matveev ipv6_mapped_addr_any(&np->saddr)) 207c720c7e8SEric Dumazet ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); 2081da177e4SLinus Torvalds 209efe4208fSEric Dumazet if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) || 210efe4208fSEric Dumazet ipv6_mapped_addr_any(&sk->sk_v6_rcv_saddr)) { 211c720c7e8SEric Dumazet ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, 212efe4208fSEric Dumazet &sk->sk_v6_rcv_saddr); 213719f8358SEric Dumazet if (sk->sk_prot->rehash) 214719f8358SEric Dumazet sk->sk_prot->rehash(sk); 215719f8358SEric Dumazet } 216b301e82cSBrian Haley 2171da177e4SLinus Torvalds goto out; 2181da177e4SLinus Torvalds } 2191da177e4SLinus Torvalds 220842df073SHannes Frederic Sowa if (__ipv6_addr_needs_scope_id(addr_type)) { 2211da177e4SLinus Torvalds if (addr_len >= sizeof(struct sockaddr_in6) && 2221da177e4SLinus Torvalds usin->sin6_scope_id) { 22354dc3e33SDavid Ahern if (!sk_dev_equal_l3scope(sk, usin->sin6_scope_id)) { 2241da177e4SLinus Torvalds err = -EINVAL; 2251da177e4SLinus Torvalds goto out; 2261da177e4SLinus Torvalds } 2274c971d2fSEric Dumazet WRITE_ONCE(sk->sk_bound_dev_if, usin->sin6_scope_id); 2281da177e4SLinus Torvalds } 2291da177e4SLinus Torvalds 2301ac4f008SBrian Haley if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST)) 2314c971d2fSEric Dumazet WRITE_ONCE(sk->sk_bound_dev_if, np->mcast_oif); 2321ac4f008SBrian Haley 2331da177e4SLinus Torvalds /* Connect to link-local address requires an interface */ 2341da177e4SLinus Torvalds if (!sk->sk_bound_dev_if) { 2351da177e4SLinus Torvalds err = -EINVAL; 2361da177e4SLinus Torvalds goto out; 2371da177e4SLinus Torvalds } 2381da177e4SLinus Torvalds } 2391da177e4SLinus Torvalds 2402f987a76SPaolo Abeni /* save the current peer information before updating it */ 2412f987a76SPaolo Abeni old_daddr = sk->sk_v6_daddr; 2422f987a76SPaolo Abeni old_fl6_flowlabel = np->flow_label; 2432f987a76SPaolo Abeni old_dport = inet->inet_dport; 2442f987a76SPaolo Abeni 245efe4208fSEric Dumazet sk->sk_v6_daddr = *daddr; 24680fbdb20SMartin KaFai Lau np->flow_label = fl6_flowlabel; 247c720c7e8SEric Dumazet inet->inet_dport = usin->sin6_port; 2481da177e4SLinus Torvalds 2491da177e4SLinus Torvalds /* 2501da177e4SLinus Torvalds * Check for a route to destination an obtain the 2511da177e4SLinus Torvalds * destination cache for it. 2521da177e4SLinus Torvalds */ 2531da177e4SLinus Torvalds 25433c162a9SMartin KaFai Lau err = ip6_datagram_dst_update(sk, true); 25585cb73ffSWei Wang if (err) { 2562f987a76SPaolo Abeni /* Restore the socket peer info, to keep it consistent with 2572f987a76SPaolo Abeni * the old socket state 25885cb73ffSWei Wang */ 2592f987a76SPaolo Abeni sk->sk_v6_daddr = old_daddr; 2602f987a76SPaolo Abeni np->flow_label = old_fl6_flowlabel; 2612f987a76SPaolo Abeni inet->inet_dport = old_dport; 2621da177e4SLinus Torvalds goto out; 26385cb73ffSWei Wang } 2641da177e4SLinus Torvalds 26569421bf9SKuniyuki Iwashima reuseport_has_conns_set(sk); 2661da177e4SLinus Torvalds sk->sk_state = TCP_ESTABLISHED; 267877d1f62STom Herbert sk_set_txhash(sk); 2681da177e4SLinus Torvalds out: 2691da177e4SLinus Torvalds return err; 2701da177e4SLinus Torvalds } 2710382a25aSGuillaume Nault EXPORT_SYMBOL_GPL(__ip6_datagram_connect); 27203645a11SEric Dumazet 27303645a11SEric Dumazet int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) 27403645a11SEric Dumazet { 27503645a11SEric Dumazet int res; 27603645a11SEric Dumazet 27703645a11SEric Dumazet lock_sock(sk); 27803645a11SEric Dumazet res = __ip6_datagram_connect(sk, uaddr, addr_len); 27903645a11SEric Dumazet release_sock(sk); 28003645a11SEric Dumazet return res; 28103645a11SEric Dumazet } 282a495f836SChris Elston EXPORT_SYMBOL_GPL(ip6_datagram_connect); 2831da177e4SLinus Torvalds 28482b276cdSHannes Frederic Sowa int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr, 28582b276cdSHannes Frederic Sowa int addr_len) 28682b276cdSHannes Frederic Sowa { 28782b276cdSHannes Frederic Sowa DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr); 28882b276cdSHannes Frederic Sowa if (sin6->sin6_family != AF_INET6) 28982b276cdSHannes Frederic Sowa return -EAFNOSUPPORT; 29082b276cdSHannes Frederic Sowa return ip6_datagram_connect(sk, uaddr, addr_len); 29182b276cdSHannes Frederic Sowa } 29282b276cdSHannes Frederic Sowa EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only); 29382b276cdSHannes Frederic Sowa 29401370434SWillem de Bruijn static void ipv6_icmp_error_rfc4884(const struct sk_buff *skb, 29501370434SWillem de Bruijn struct sock_ee_data_rfc4884 *out) 29601370434SWillem de Bruijn { 29701370434SWillem de Bruijn switch (icmp6_hdr(skb)->icmp6_type) { 29801370434SWillem de Bruijn case ICMPV6_TIME_EXCEED: 29901370434SWillem de Bruijn case ICMPV6_DEST_UNREACH: 30001370434SWillem de Bruijn ip_icmp_error_rfc4884(skb, out, sizeof(struct icmp6hdr), 30101370434SWillem de Bruijn icmp6_hdr(skb)->icmp6_datagram_len * 8); 30201370434SWillem de Bruijn } 30301370434SWillem de Bruijn } 30401370434SWillem de Bruijn 3051da177e4SLinus Torvalds void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 306e69a4adcSAl Viro __be16 port, u32 info, u8 *payload) 3071da177e4SLinus Torvalds { 3081da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 309cc70ab26SArnaldo Carvalho de Melo struct icmp6hdr *icmph = icmp6_hdr(skb); 3101da177e4SLinus Torvalds struct sock_exterr_skb *serr; 3111da177e4SLinus Torvalds 3121da177e4SLinus Torvalds if (!np->recverr) 3131da177e4SLinus Torvalds return; 3141da177e4SLinus Torvalds 3151da177e4SLinus Torvalds skb = skb_clone(skb, GFP_ATOMIC); 3161da177e4SLinus Torvalds if (!skb) 3171da177e4SLinus Torvalds return; 3181da177e4SLinus Torvalds 319d40a4de0SBrian Haley skb->protocol = htons(ETH_P_IPV6); 320d40a4de0SBrian Haley 3211da177e4SLinus Torvalds serr = SKB_EXT_ERR(skb); 3221da177e4SLinus Torvalds serr->ee.ee_errno = err; 3231da177e4SLinus Torvalds serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6; 3241da177e4SLinus Torvalds serr->ee.ee_type = icmph->icmp6_type; 3251da177e4SLinus Torvalds serr->ee.ee_code = icmph->icmp6_code; 3261da177e4SLinus Torvalds serr->ee.ee_pad = 0; 3271da177e4SLinus Torvalds serr->ee.ee_info = info; 3281da177e4SLinus Torvalds serr->ee.ee_data = 0; 329d56f90a7SArnaldo Carvalho de Melo serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) - 330d56f90a7SArnaldo Carvalho de Melo skb_network_header(skb); 3311da177e4SLinus Torvalds serr->port = port; 3321da177e4SLinus Torvalds 3331da177e4SLinus Torvalds __skb_pull(skb, payload - skb->data); 33401370434SWillem de Bruijn 33501370434SWillem de Bruijn if (inet6_sk(sk)->recverr_rfc4884) 33601370434SWillem de Bruijn ipv6_icmp_error_rfc4884(skb, &serr->ee.ee_rfc4884); 33701370434SWillem de Bruijn 338bd82393cSArnaldo Carvalho de Melo skb_reset_transport_header(skb); 3391da177e4SLinus Torvalds 3401da177e4SLinus Torvalds if (sock_queue_err_skb(sk, skb)) 3411da177e4SLinus Torvalds kfree_skb(skb); 3421da177e4SLinus Torvalds } 34342fb06b3SDavid Howells EXPORT_SYMBOL_GPL(ipv6_icmp_error); 3441da177e4SLinus Torvalds 3454c9483b2SDavid S. Miller void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info) 3461da177e4SLinus Torvalds { 3471c1e9d2bSEric Dumazet const struct ipv6_pinfo *np = inet6_sk(sk); 3481da177e4SLinus Torvalds struct sock_exterr_skb *serr; 3491da177e4SLinus Torvalds struct ipv6hdr *iph; 3501da177e4SLinus Torvalds struct sk_buff *skb; 3511da177e4SLinus Torvalds 3521da177e4SLinus Torvalds if (!np->recverr) 3531da177e4SLinus Torvalds return; 3541da177e4SLinus Torvalds 3551da177e4SLinus Torvalds skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 3561da177e4SLinus Torvalds if (!skb) 3571da177e4SLinus Torvalds return; 3581da177e4SLinus Torvalds 359d40a4de0SBrian Haley skb->protocol = htons(ETH_P_IPV6); 360d40a4de0SBrian Haley 3611ced98e8SArnaldo Carvalho de Melo skb_put(skb, sizeof(struct ipv6hdr)); 3621ced98e8SArnaldo Carvalho de Melo skb_reset_network_header(skb); 3630660e03fSArnaldo Carvalho de Melo iph = ipv6_hdr(skb); 3644e3fd7a0SAlexey Dobriyan iph->daddr = fl6->daddr; 3657d033c9fSEric Dumazet ip6_flow_hdr(iph, 0, 0); 3661da177e4SLinus Torvalds 3671da177e4SLinus Torvalds serr = SKB_EXT_ERR(skb); 3681da177e4SLinus Torvalds serr->ee.ee_errno = err; 3691da177e4SLinus Torvalds serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 3701da177e4SLinus Torvalds serr->ee.ee_type = 0; 3711da177e4SLinus Torvalds serr->ee.ee_code = 0; 3721da177e4SLinus Torvalds serr->ee.ee_pad = 0; 3731da177e4SLinus Torvalds serr->ee.ee_info = info; 3741da177e4SLinus Torvalds serr->ee.ee_data = 0; 375d56f90a7SArnaldo Carvalho de Melo serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); 3761958b856SDavid S. Miller serr->port = fl6->fl6_dport; 3771da177e4SLinus Torvalds 37827a884dcSArnaldo Carvalho de Melo __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 379bd82393cSArnaldo Carvalho de Melo skb_reset_transport_header(skb); 3801da177e4SLinus Torvalds 3811da177e4SLinus Torvalds if (sock_queue_err_skb(sk, skb)) 3821da177e4SLinus Torvalds kfree_skb(skb); 3831da177e4SLinus Torvalds } 3841da177e4SLinus Torvalds 3854c9483b2SDavid S. Miller void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu) 3864b340ae2SBrian Haley { 3874b340ae2SBrian Haley struct ipv6_pinfo *np = inet6_sk(sk); 3884b340ae2SBrian Haley struct ipv6hdr *iph; 3894b340ae2SBrian Haley struct sk_buff *skb; 3904b340ae2SBrian Haley struct ip6_mtuinfo *mtu_info; 3914b340ae2SBrian Haley 3924b340ae2SBrian Haley if (!np->rxopt.bits.rxpmtu) 3934b340ae2SBrian Haley return; 3944b340ae2SBrian Haley 3954b340ae2SBrian Haley skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 3964b340ae2SBrian Haley if (!skb) 3974b340ae2SBrian Haley return; 3984b340ae2SBrian Haley 3994b340ae2SBrian Haley skb_put(skb, sizeof(struct ipv6hdr)); 4004b340ae2SBrian Haley skb_reset_network_header(skb); 4014b340ae2SBrian Haley iph = ipv6_hdr(skb); 4024e3fd7a0SAlexey Dobriyan iph->daddr = fl6->daddr; 4034b340ae2SBrian Haley 4044b340ae2SBrian Haley mtu_info = IP6CBMTU(skb); 4054b340ae2SBrian Haley 4064b340ae2SBrian Haley mtu_info->ip6m_mtu = mtu; 4074b340ae2SBrian Haley mtu_info->ip6m_addr.sin6_family = AF_INET6; 4084b340ae2SBrian Haley mtu_info->ip6m_addr.sin6_port = 0; 4094b340ae2SBrian Haley mtu_info->ip6m_addr.sin6_flowinfo = 0; 4104c9483b2SDavid S. Miller mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif; 4114e3fd7a0SAlexey Dobriyan mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr; 4124b340ae2SBrian Haley 4134b340ae2SBrian Haley __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 4144b340ae2SBrian Haley skb_reset_transport_header(skb); 4154b340ae2SBrian Haley 4164b340ae2SBrian Haley skb = xchg(&np->rxpmtu, skb); 4174b340ae2SBrian Haley kfree_skb(skb); 4184b340ae2SBrian Haley } 4194b340ae2SBrian Haley 42034b99df4SJulian Anastasov /* For some errors we have valid addr_offset even with zero payload and 42134b99df4SJulian Anastasov * zero port. Also, addr_offset should be supported if port is set. 42234b99df4SJulian Anastasov */ 42334b99df4SJulian Anastasov static inline bool ipv6_datagram_support_addr(struct sock_exterr_skb *serr) 42434b99df4SJulian Anastasov { 42534b99df4SJulian Anastasov return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6 || 42634b99df4SJulian Anastasov serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || 42734b99df4SJulian Anastasov serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port; 42834b99df4SJulian Anastasov } 42934b99df4SJulian Anastasov 430c247f053SWillem de Bruijn /* IPv6 supports cmsg on all origins aside from SO_EE_ORIGIN_LOCAL. 431c247f053SWillem de Bruijn * 432c247f053SWillem de Bruijn * At one point, excluding local errors was a quick test to identify icmp/icmp6 433c247f053SWillem de Bruijn * errors. This is no longer true, but the test remained, so the v6 stack, 434c247f053SWillem de Bruijn * unlike v4, also honors cmsg requests on all wifi and timestamp errors. 435c247f053SWillem de Bruijn */ 436c247f053SWillem de Bruijn static bool ip6_datagram_support_cmsg(struct sk_buff *skb, 437c247f053SWillem de Bruijn struct sock_exterr_skb *serr) 438829ae9d6SWillem de Bruijn { 439c247f053SWillem de Bruijn if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || 440c247f053SWillem de Bruijn serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) 441c247f053SWillem de Bruijn return true; 442c247f053SWillem de Bruijn 443c247f053SWillem de Bruijn if (serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL) 444c247f053SWillem de Bruijn return false; 445c247f053SWillem de Bruijn 4461862d620SWillem de Bruijn if (!IP6CB(skb)->iif) 447c247f053SWillem de Bruijn return false; 448829ae9d6SWillem de Bruijn 449c247f053SWillem de Bruijn return true; 450829ae9d6SWillem de Bruijn } 451829ae9d6SWillem de Bruijn 4521da177e4SLinus Torvalds /* 4531da177e4SLinus Torvalds * Handle MSG_ERRQUEUE 4541da177e4SLinus Torvalds */ 45585fbaa75SHannes Frederic Sowa int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 4561da177e4SLinus Torvalds { 4571da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 4581da177e4SLinus Torvalds struct sock_exterr_skb *serr; 459364a9e93SWillem de Bruijn struct sk_buff *skb; 460342dfc30SSteffen Hurrle DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); 4611da177e4SLinus Torvalds struct { 4621da177e4SLinus Torvalds struct sock_extended_err ee; 4631da177e4SLinus Torvalds struct sockaddr_in6 offender; 4641da177e4SLinus Torvalds } errhdr; 4651da177e4SLinus Torvalds int err; 4661da177e4SLinus Torvalds int copied; 4671da177e4SLinus Torvalds 4681da177e4SLinus Torvalds err = -EAGAIN; 469364a9e93SWillem de Bruijn skb = sock_dequeue_err_skb(sk); 47063159f29SIan Morris if (!skb) 4711da177e4SLinus Torvalds goto out; 4721da177e4SLinus Torvalds 4731da177e4SLinus Torvalds copied = skb->len; 4741da177e4SLinus Torvalds if (copied > len) { 4751da177e4SLinus Torvalds msg->msg_flags |= MSG_TRUNC; 4761da177e4SLinus Torvalds copied = len; 4771da177e4SLinus Torvalds } 47851f3d02bSDavid S. Miller err = skb_copy_datagram_msg(skb, 0, msg, copied); 479960a2628SEric Dumazet if (unlikely(err)) { 480960a2628SEric Dumazet kfree_skb(skb); 481960a2628SEric Dumazet return err; 482960a2628SEric Dumazet } 4831da177e4SLinus Torvalds sock_recv_timestamp(msg, sk, skb); 4841da177e4SLinus Torvalds 4851da177e4SLinus Torvalds serr = SKB_EXT_ERR(skb); 4861da177e4SLinus Torvalds 48734b99df4SJulian Anastasov if (sin && ipv6_datagram_support_addr(serr)) { 488d56f90a7SArnaldo Carvalho de Melo const unsigned char *nh = skb_network_header(skb); 4891da177e4SLinus Torvalds sin->sin6_family = AF_INET6; 4901da177e4SLinus Torvalds sin->sin6_flowinfo = 0; 4911da177e4SLinus Torvalds sin->sin6_port = serr->port; 492d40a4de0SBrian Haley if (skb->protocol == htons(ETH_P_IPV6)) { 4936c40d100SYOSHIFUJI Hideaki / 吉藤英明 const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset), 4946c40d100SYOSHIFUJI Hideaki / 吉藤英明 struct ipv6hdr, daddr); 4956c40d100SYOSHIFUJI Hideaki / 吉藤英明 sin->sin6_addr = ip6h->daddr; 4961da177e4SLinus Torvalds if (np->sndflow) 4976502ca52SYOSHIFUJI Hideaki / 吉藤英明 sin->sin6_flowinfo = ip6_flowinfo(ip6h); 498842df073SHannes Frederic Sowa sin->sin6_scope_id = 499842df073SHannes Frederic Sowa ipv6_iface_scope_id(&sin->sin6_addr, 500842df073SHannes Frederic Sowa IP6CB(skb)->iif); 5011da177e4SLinus Torvalds } else { 502b301e82cSBrian Haley ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset), 503b301e82cSBrian Haley &sin->sin6_addr); 504842df073SHannes Frederic Sowa sin->sin6_scope_id = 0; 5051da177e4SLinus Torvalds } 50685fbaa75SHannes Frederic Sowa *addr_len = sizeof(*sin); 5071da177e4SLinus Torvalds } 5081da177e4SLinus Torvalds 5091da177e4SLinus Torvalds memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 5101da177e4SLinus Torvalds sin = &errhdr.offender; 511f812116bSWillem de Bruijn memset(sin, 0, sizeof(*sin)); 512c247f053SWillem de Bruijn 513c247f053SWillem de Bruijn if (ip6_datagram_support_cmsg(skb, serr)) { 5141da177e4SLinus Torvalds sin->sin6_family = AF_INET6; 515c247f053SWillem de Bruijn if (np->rxopt.all) 5164b261c75SHannes Frederic Sowa ip6_datagram_recv_common_ctl(sk, msg, skb); 517d40a4de0SBrian Haley if (skb->protocol == htons(ETH_P_IPV6)) { 5184e3fd7a0SAlexey Dobriyan sin->sin6_addr = ipv6_hdr(skb)->saddr; 5191da177e4SLinus Torvalds if (np->rxopt.all) 5204b261c75SHannes Frederic Sowa ip6_datagram_recv_specific_ctl(sk, msg, skb); 521842df073SHannes Frederic Sowa sin->sin6_scope_id = 522842df073SHannes Frederic Sowa ipv6_iface_scope_id(&sin->sin6_addr, 523842df073SHannes Frederic Sowa IP6CB(skb)->iif); 5241da177e4SLinus Torvalds } else { 525b301e82cSBrian Haley ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 526b301e82cSBrian Haley &sin->sin6_addr); 527f812116bSWillem de Bruijn if (inet_sk(sk)->cmsg_flags) 5281da177e4SLinus Torvalds ip_cmsg_recv(msg, skb); 5291da177e4SLinus Torvalds } 5301da177e4SLinus Torvalds } 5311da177e4SLinus Torvalds 5321da177e4SLinus Torvalds put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr); 5331da177e4SLinus Torvalds 5341da177e4SLinus Torvalds /* Now we could try to dump offended packet options */ 5351da177e4SLinus Torvalds 5361da177e4SLinus Torvalds msg->msg_flags |= MSG_ERRQUEUE; 5371da177e4SLinus Torvalds err = copied; 5381da177e4SLinus Torvalds 539960a2628SEric Dumazet consume_skb(skb); 5401da177e4SLinus Torvalds out: 5411da177e4SLinus Torvalds return err; 5421da177e4SLinus Torvalds } 543a495f836SChris Elston EXPORT_SYMBOL_GPL(ipv6_recv_error); 5441da177e4SLinus Torvalds 5454b340ae2SBrian Haley /* 5464b340ae2SBrian Haley * Handle IPV6_RECVPATHMTU 5474b340ae2SBrian Haley */ 54885fbaa75SHannes Frederic Sowa int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len, 54985fbaa75SHannes Frederic Sowa int *addr_len) 5504b340ae2SBrian Haley { 5514b340ae2SBrian Haley struct ipv6_pinfo *np = inet6_sk(sk); 5524b340ae2SBrian Haley struct sk_buff *skb; 5534b340ae2SBrian Haley struct ip6_mtuinfo mtu_info; 554342dfc30SSteffen Hurrle DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); 5554b340ae2SBrian Haley int err; 5564b340ae2SBrian Haley int copied; 5574b340ae2SBrian Haley 5584b340ae2SBrian Haley err = -EAGAIN; 5594b340ae2SBrian Haley skb = xchg(&np->rxpmtu, NULL); 56063159f29SIan Morris if (!skb) 5614b340ae2SBrian Haley goto out; 5624b340ae2SBrian Haley 5634b340ae2SBrian Haley copied = skb->len; 5644b340ae2SBrian Haley if (copied > len) { 5654b340ae2SBrian Haley msg->msg_flags |= MSG_TRUNC; 5664b340ae2SBrian Haley copied = len; 5674b340ae2SBrian Haley } 56851f3d02bSDavid S. Miller err = skb_copy_datagram_msg(skb, 0, msg, copied); 5694b340ae2SBrian Haley if (err) 5704b340ae2SBrian Haley goto out_free_skb; 5714b340ae2SBrian Haley 5724b340ae2SBrian Haley sock_recv_timestamp(msg, sk, skb); 5734b340ae2SBrian Haley 5744b340ae2SBrian Haley memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info)); 5754b340ae2SBrian Haley 5764b340ae2SBrian Haley if (sin) { 5774b340ae2SBrian Haley sin->sin6_family = AF_INET6; 5784b340ae2SBrian Haley sin->sin6_flowinfo = 0; 5794b340ae2SBrian Haley sin->sin6_port = 0; 5804b340ae2SBrian Haley sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id; 5814e3fd7a0SAlexey Dobriyan sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr; 58285fbaa75SHannes Frederic Sowa *addr_len = sizeof(*sin); 5834b340ae2SBrian Haley } 5844b340ae2SBrian Haley 5854b340ae2SBrian Haley put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info); 5864b340ae2SBrian Haley 5874b340ae2SBrian Haley err = copied; 5884b340ae2SBrian Haley 5894b340ae2SBrian Haley out_free_skb: 5904b340ae2SBrian Haley kfree_skb(skb); 5914b340ae2SBrian Haley out: 5924b340ae2SBrian Haley return err; 5934b340ae2SBrian Haley } 5941da177e4SLinus Torvalds 5951da177e4SLinus Torvalds 5964b261c75SHannes Frederic Sowa void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg, 5974b261c75SHannes Frederic Sowa struct sk_buff *skb) 5984b261c75SHannes Frederic Sowa { 5994b261c75SHannes Frederic Sowa struct ipv6_pinfo *np = inet6_sk(sk); 6004b261c75SHannes Frederic Sowa bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6); 6014b261c75SHannes Frederic Sowa 6024b261c75SHannes Frederic Sowa if (np->rxopt.bits.rxinfo) { 6034b261c75SHannes Frederic Sowa struct in6_pktinfo src_info; 6044b261c75SHannes Frederic Sowa 6054b261c75SHannes Frederic Sowa if (is_ipv6) { 6064b261c75SHannes Frederic Sowa src_info.ipi6_ifindex = IP6CB(skb)->iif; 6074b261c75SHannes Frederic Sowa src_info.ipi6_addr = ipv6_hdr(skb)->daddr; 6084b261c75SHannes Frederic Sowa } else { 6094b261c75SHannes Frederic Sowa src_info.ipi6_ifindex = 6104b261c75SHannes Frederic Sowa PKTINFO_SKB_CB(skb)->ipi_ifindex; 6114b261c75SHannes Frederic Sowa ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr, 6124b261c75SHannes Frederic Sowa &src_info.ipi6_addr); 6134b261c75SHannes Frederic Sowa } 614829ae9d6SWillem de Bruijn 615829ae9d6SWillem de Bruijn if (src_info.ipi6_ifindex >= 0) 616829ae9d6SWillem de Bruijn put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, 617829ae9d6SWillem de Bruijn sizeof(src_info), &src_info); 6184b261c75SHannes Frederic Sowa } 6194b261c75SHannes Frederic Sowa } 6204b261c75SHannes Frederic Sowa 6214b261c75SHannes Frederic Sowa void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg, 62273df66f8STom Parkin struct sk_buff *skb) 6231da177e4SLinus Torvalds { 6241da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 6251da177e4SLinus Torvalds struct inet6_skb_parm *opt = IP6CB(skb); 626d56f90a7SArnaldo Carvalho de Melo unsigned char *nh = skb_network_header(skb); 6271da177e4SLinus Torvalds 6281da177e4SLinus Torvalds if (np->rxopt.bits.rxhlim) { 6290660e03fSArnaldo Carvalho de Melo int hlim = ipv6_hdr(skb)->hop_limit; 6301da177e4SLinus Torvalds put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 6311da177e4SLinus Torvalds } 6321da177e4SLinus Torvalds 63341a1f8eaSYOSHIFUJI Hideaki if (np->rxopt.bits.rxtclass) { 634e7219858SYOSHIFUJI Hideaki / 吉藤英明 int tclass = ipv6_get_dsfield(ipv6_hdr(skb)); 63541a1f8eaSYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 63641a1f8eaSYOSHIFUJI Hideaki } 63741a1f8eaSYOSHIFUJI Hideaki 6386502ca52SYOSHIFUJI Hideaki / 吉藤英明 if (np->rxopt.bits.rxflow) { 6396502ca52SYOSHIFUJI Hideaki / 吉藤英明 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh); 6406502ca52SYOSHIFUJI Hideaki / 吉藤英明 if (flowinfo) 6411da177e4SLinus Torvalds put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 6421da177e4SLinus Torvalds } 643333fad53SYOSHIFUJI Hideaki 644333fad53SYOSHIFUJI Hideaki /* HbH is allowed only once */ 6458b58a398SFlorian Westphal if (np->rxopt.bits.hopopts && (opt->flags & IP6SKB_HOPBYHOP)) { 6468b58a398SFlorian Westphal u8 *ptr = nh + sizeof(struct ipv6hdr); 6471da177e4SLinus Torvalds put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); 6481da177e4SLinus Torvalds } 649333fad53SYOSHIFUJI Hideaki 650333fad53SYOSHIFUJI Hideaki if (opt->lastopt && 651333fad53SYOSHIFUJI Hideaki (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { 652333fad53SYOSHIFUJI Hideaki /* 653333fad53SYOSHIFUJI Hideaki * Silly enough, but we need to reparse in order to 654333fad53SYOSHIFUJI Hideaki * report extension headers (except for HbH) 655333fad53SYOSHIFUJI Hideaki * in order. 656333fad53SYOSHIFUJI Hideaki * 657333fad53SYOSHIFUJI Hideaki * Also note that IPV6_RECVRTHDRDSTOPTS is NOT 658333fad53SYOSHIFUJI Hideaki * (and WILL NOT be) defined because 659333fad53SYOSHIFUJI Hideaki * IPV6_RECVDSTOPTS is more generic. --yoshfuji 660333fad53SYOSHIFUJI Hideaki */ 661333fad53SYOSHIFUJI Hideaki unsigned int off = sizeof(struct ipv6hdr); 6620660e03fSArnaldo Carvalho de Melo u8 nexthdr = ipv6_hdr(skb)->nexthdr; 663333fad53SYOSHIFUJI Hideaki 664333fad53SYOSHIFUJI Hideaki while (off <= opt->lastopt) { 66595c96174SEric Dumazet unsigned int len; 666d56f90a7SArnaldo Carvalho de Melo u8 *ptr = nh + off; 667333fad53SYOSHIFUJI Hideaki 668333fad53SYOSHIFUJI Hideaki switch (nexthdr) { 669333fad53SYOSHIFUJI Hideaki case IPPROTO_DSTOPTS: 670333fad53SYOSHIFUJI Hideaki nexthdr = ptr[0]; 671333fad53SYOSHIFUJI Hideaki len = (ptr[1] + 1) << 3; 672333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.dstopts) 673333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr); 674333fad53SYOSHIFUJI Hideaki break; 675333fad53SYOSHIFUJI Hideaki case IPPROTO_ROUTING: 676333fad53SYOSHIFUJI Hideaki nexthdr = ptr[0]; 677333fad53SYOSHIFUJI Hideaki len = (ptr[1] + 1) << 3; 678333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.srcrt) 679333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr); 680333fad53SYOSHIFUJI Hideaki break; 681333fad53SYOSHIFUJI Hideaki case IPPROTO_AH: 682333fad53SYOSHIFUJI Hideaki nexthdr = ptr[0]; 683a3059893SVille Nuorvala len = (ptr[1] + 2) << 2; 684333fad53SYOSHIFUJI Hideaki break; 685333fad53SYOSHIFUJI Hideaki default: 686333fad53SYOSHIFUJI Hideaki nexthdr = ptr[0]; 687333fad53SYOSHIFUJI Hideaki len = (ptr[1] + 1) << 3; 688333fad53SYOSHIFUJI Hideaki break; 689333fad53SYOSHIFUJI Hideaki } 690333fad53SYOSHIFUJI Hideaki 691333fad53SYOSHIFUJI Hideaki off += len; 692333fad53SYOSHIFUJI Hideaki } 693333fad53SYOSHIFUJI Hideaki } 694333fad53SYOSHIFUJI Hideaki 695333fad53SYOSHIFUJI Hideaki /* socket options in old style */ 696333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.rxoinfo) { 697333fad53SYOSHIFUJI Hideaki struct in6_pktinfo src_info; 698333fad53SYOSHIFUJI Hideaki 699333fad53SYOSHIFUJI Hideaki src_info.ipi6_ifindex = opt->iif; 7004e3fd7a0SAlexey Dobriyan src_info.ipi6_addr = ipv6_hdr(skb)->daddr; 701333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 702333fad53SYOSHIFUJI Hideaki } 703333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.rxohlim) { 7040660e03fSArnaldo Carvalho de Melo int hlim = ipv6_hdr(skb)->hop_limit; 705333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 706333fad53SYOSHIFUJI Hideaki } 7078b58a398SFlorian Westphal if (np->rxopt.bits.ohopopts && (opt->flags & IP6SKB_HOPBYHOP)) { 7088b58a398SFlorian Westphal u8 *ptr = nh + sizeof(struct ipv6hdr); 709333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr); 710333fad53SYOSHIFUJI Hideaki } 711333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.odstopts && opt->dst0) { 712d56f90a7SArnaldo Carvalho de Melo u8 *ptr = nh + opt->dst0; 713333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 7141da177e4SLinus Torvalds } 715333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.osrcrt && opt->srcrt) { 716d56f90a7SArnaldo Carvalho de Melo struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt); 717333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr); 7181da177e4SLinus Torvalds } 719333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.odstopts && opt->dst1) { 720d56f90a7SArnaldo Carvalho de Melo u8 *ptr = nh + opt->dst1; 721333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 7221da177e4SLinus Torvalds } 7236c468622SBalazs Scheidler if (np->rxopt.bits.rxorigdstaddr) { 7246c468622SBalazs Scheidler struct sockaddr_in6 sin6; 7254a06fa67SWillem de Bruijn __be16 _ports[2], *ports; 7266c468622SBalazs Scheidler 7274a06fa67SWillem de Bruijn ports = skb_header_pointer(skb, skb_transport_offset(skb), 7284a06fa67SWillem de Bruijn sizeof(_ports), &_ports); 7294a06fa67SWillem de Bruijn if (ports) { 7306c468622SBalazs Scheidler /* All current transport protocols have the port numbers in the 7316c468622SBalazs Scheidler * first four bytes of the transport header and this function is 7326c468622SBalazs Scheidler * written with this assumption in mind. 7336c468622SBalazs Scheidler */ 7346c468622SBalazs Scheidler sin6.sin6_family = AF_INET6; 7354e3fd7a0SAlexey Dobriyan sin6.sin6_addr = ipv6_hdr(skb)->daddr; 7366c468622SBalazs Scheidler sin6.sin6_port = ports[1]; 7376c468622SBalazs Scheidler sin6.sin6_flowinfo = 0; 7383868b7aaSHannes Frederic Sowa sin6.sin6_scope_id = 7393868b7aaSHannes Frederic Sowa ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr, 7403868b7aaSHannes Frederic Sowa opt->iif); 7416c468622SBalazs Scheidler 7426c468622SBalazs Scheidler put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6); 7436c468622SBalazs Scheidler } 7446c468622SBalazs Scheidler } 7450cc0aa61SWillem de Bruijn if (np->rxopt.bits.recvfragsize && opt->frag_max_size) { 7460cc0aa61SWillem de Bruijn int val = opt->frag_max_size; 7470cc0aa61SWillem de Bruijn 7480cc0aa61SWillem de Bruijn put_cmsg(msg, SOL_IPV6, IPV6_RECVFRAGSIZE, sizeof(val), &val); 7490cc0aa61SWillem de Bruijn } 7504b261c75SHannes Frederic Sowa } 7514b261c75SHannes Frederic Sowa 7524b261c75SHannes Frederic Sowa void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg, 7534b261c75SHannes Frederic Sowa struct sk_buff *skb) 7544b261c75SHannes Frederic Sowa { 7554b261c75SHannes Frederic Sowa ip6_datagram_recv_common_ctl(sk, msg, skb); 7564b261c75SHannes Frederic Sowa ip6_datagram_recv_specific_ctl(sk, msg, skb); 7571da177e4SLinus Torvalds } 7588e72d37eSTom Parkin EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl); 7591da177e4SLinus Torvalds 76073df66f8STom Parkin int ip6_datagram_send_ctl(struct net *net, struct sock *sk, 7614c9483b2SDavid S. Miller struct msghdr *msg, struct flowi6 *fl6, 7625fdaa88dSWillem de Bruijn struct ipcm6_cookie *ipc6) 7631da177e4SLinus Torvalds { 7641da177e4SLinus Torvalds struct in6_pktinfo *src_info; 7651da177e4SLinus Torvalds struct cmsghdr *cmsg; 7661da177e4SLinus Torvalds struct ipv6_rt_hdr *rthdr; 7671da177e4SLinus Torvalds struct ipv6_opt_hdr *hdr; 76826879da5SWei Wang struct ipv6_txoptions *opt = ipc6->opt; 7691da177e4SLinus Torvalds int len; 7701da177e4SLinus Torvalds int err = 0; 7711da177e4SLinus Torvalds 772f95b414eSGu Zheng for_each_cmsghdr(cmsg, msg) { 7731da177e4SLinus Torvalds int addr_type; 7741da177e4SLinus Torvalds 7751da177e4SLinus Torvalds if (!CMSG_OK(msg, cmsg)) { 7761da177e4SLinus Torvalds err = -EINVAL; 7771da177e4SLinus Torvalds goto exit_f; 7781da177e4SLinus Torvalds } 7791da177e4SLinus Torvalds 780ad1e46a8SSoheil Hassas Yeganeh if (cmsg->cmsg_level == SOL_SOCKET) { 781233baf9aSxu xin err = __sock_cmsg_send(sk, cmsg, &ipc6->sockc); 7822632616bSEric Dumazet if (err) 7832632616bSEric Dumazet return err; 784ad1e46a8SSoheil Hassas Yeganeh continue; 785ad1e46a8SSoheil Hassas Yeganeh } 786ad1e46a8SSoheil Hassas Yeganeh 7871da177e4SLinus Torvalds if (cmsg->cmsg_level != SOL_IPV6) 7881da177e4SLinus Torvalds continue; 7891da177e4SLinus Torvalds 7901da177e4SLinus Torvalds switch (cmsg->cmsg_type) { 7911da177e4SLinus Torvalds case IPV6_PKTINFO: 792333fad53SYOSHIFUJI Hideaki case IPV6_2292PKTINFO: 793187e3838SYOSHIFUJI Hideaki { 794187e3838SYOSHIFUJI Hideaki struct net_device *dev = NULL; 7956da5b0f0SMike Manning int src_idx; 796187e3838SYOSHIFUJI Hideaki 7971da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { 7981da177e4SLinus Torvalds err = -EINVAL; 7991da177e4SLinus Torvalds goto exit_f; 8001da177e4SLinus Torvalds } 8011da177e4SLinus Torvalds 8021da177e4SLinus Torvalds src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); 8036da5b0f0SMike Manning src_idx = src_info->ipi6_ifindex; 8041da177e4SLinus Torvalds 8056da5b0f0SMike Manning if (src_idx) { 8064c9483b2SDavid S. Miller if (fl6->flowi6_oif && 8076da5b0f0SMike Manning src_idx != fl6->flowi6_oif && 8084c971d2fSEric Dumazet (READ_ONCE(sk->sk_bound_dev_if) != fl6->flowi6_oif || 8096da5b0f0SMike Manning !sk_dev_equal_l3scope(sk, src_idx))) 8101da177e4SLinus Torvalds return -EINVAL; 8116da5b0f0SMike Manning fl6->flowi6_oif = src_idx; 8121da177e4SLinus Torvalds } 8131da177e4SLinus Torvalds 814187e3838SYOSHIFUJI Hideaki addr_type = __ipv6_addr_type(&src_info->ipi6_addr); 8151da177e4SLinus Torvalds 816536b2e92SEric Dumazet rcu_read_lock(); 8174c9483b2SDavid S. Miller if (fl6->flowi6_oif) { 8184c9483b2SDavid S. Miller dev = dev_get_by_index_rcu(net, fl6->flowi6_oif); 819536b2e92SEric Dumazet if (!dev) { 820536b2e92SEric Dumazet rcu_read_unlock(); 8211da177e4SLinus Torvalds return -ENODEV; 822536b2e92SEric Dumazet } 823536b2e92SEric Dumazet } else if (addr_type & IPV6_ADDR_LINKLOCAL) { 824536b2e92SEric Dumazet rcu_read_unlock(); 825187e3838SYOSHIFUJI Hideaki return -EINVAL; 826536b2e92SEric Dumazet } 827187e3838SYOSHIFUJI Hideaki 828187e3838SYOSHIFUJI Hideaki if (addr_type != IPV6_ADDR_ANY) { 829187e3838SYOSHIFUJI Hideaki int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL; 83083ba4645SVincent Bernat if (!ipv6_can_nonlocal_bind(net, inet_sk(sk)) && 831232378e8SDavid Ahern !ipv6_chk_addr_and_flags(net, &src_info->ipi6_addr, 832232378e8SDavid Ahern dev, !strict, 0, 833232378e8SDavid Ahern IFA_F_TENTATIVE) && 8347c90cc2dSFX Le Bail !ipv6_chk_acast_addr_src(net, dev, 8357c90cc2dSFX Le Bail &src_info->ipi6_addr)) 8361da177e4SLinus Torvalds err = -EINVAL; 837187e3838SYOSHIFUJI Hideaki else 8384e3fd7a0SAlexey Dobriyan fl6->saddr = src_info->ipi6_addr; 8391da177e4SLinus Torvalds } 840187e3838SYOSHIFUJI Hideaki 841536b2e92SEric Dumazet rcu_read_unlock(); 8421da177e4SLinus Torvalds 843187e3838SYOSHIFUJI Hideaki if (err) 844187e3838SYOSHIFUJI Hideaki goto exit_f; 845187e3838SYOSHIFUJI Hideaki 8461da177e4SLinus Torvalds break; 847187e3838SYOSHIFUJI Hideaki } 8481da177e4SLinus Torvalds 8491da177e4SLinus Torvalds case IPV6_FLOWINFO: 8501da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(4)) { 8511da177e4SLinus Torvalds err = -EINVAL; 8521da177e4SLinus Torvalds goto exit_f; 8531da177e4SLinus Torvalds } 8541da177e4SLinus Torvalds 8554c9483b2SDavid S. Miller if (fl6->flowlabel&IPV6_FLOWINFO_MASK) { 8564c9483b2SDavid S. Miller if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { 8571da177e4SLinus Torvalds err = -EINVAL; 8581da177e4SLinus Torvalds goto exit_f; 8591da177e4SLinus Torvalds } 8601da177e4SLinus Torvalds } 8614c9483b2SDavid S. Miller fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg); 8621da177e4SLinus Torvalds break; 8631da177e4SLinus Torvalds 864333fad53SYOSHIFUJI Hideaki case IPV6_2292HOPOPTS: 8651da177e4SLinus Torvalds case IPV6_HOPOPTS: 8661da177e4SLinus Torvalds if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 8671da177e4SLinus Torvalds err = -EINVAL; 8681da177e4SLinus Torvalds goto exit_f; 8691da177e4SLinus Torvalds } 8701da177e4SLinus Torvalds 8711da177e4SLinus Torvalds hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 8721da177e4SLinus Torvalds len = ((hdr->hdrlen + 1) << 3); 8731da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(len)) { 8741da177e4SLinus Torvalds err = -EINVAL; 8751da177e4SLinus Torvalds goto exit_f; 8761da177e4SLinus Torvalds } 877af31f412SEric W. Biederman if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 8781da177e4SLinus Torvalds err = -EPERM; 8791da177e4SLinus Torvalds goto exit_f; 8801da177e4SLinus Torvalds } 8811da177e4SLinus Torvalds opt->opt_nflen += len; 8821da177e4SLinus Torvalds opt->hopopt = hdr; 8831da177e4SLinus Torvalds break; 8841da177e4SLinus Torvalds 885333fad53SYOSHIFUJI Hideaki case IPV6_2292DSTOPTS: 8861da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 8871da177e4SLinus Torvalds err = -EINVAL; 8881da177e4SLinus Torvalds goto exit_f; 8891da177e4SLinus Torvalds } 8901da177e4SLinus Torvalds 8911da177e4SLinus Torvalds hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 8921da177e4SLinus Torvalds len = ((hdr->hdrlen + 1) << 3); 8931da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(len)) { 8941da177e4SLinus Torvalds err = -EINVAL; 8951da177e4SLinus Torvalds goto exit_f; 8961da177e4SLinus Torvalds } 897af31f412SEric W. Biederman if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 8981da177e4SLinus Torvalds err = -EPERM; 8991da177e4SLinus Torvalds goto exit_f; 9001da177e4SLinus Torvalds } 9011da177e4SLinus Torvalds if (opt->dst1opt) { 9021da177e4SLinus Torvalds err = -EINVAL; 9031da177e4SLinus Torvalds goto exit_f; 9041da177e4SLinus Torvalds } 9051da177e4SLinus Torvalds opt->opt_flen += len; 9061da177e4SLinus Torvalds opt->dst1opt = hdr; 9071da177e4SLinus Torvalds break; 9081da177e4SLinus Torvalds 909333fad53SYOSHIFUJI Hideaki case IPV6_DSTOPTS: 910333fad53SYOSHIFUJI Hideaki case IPV6_RTHDRDSTOPTS: 911333fad53SYOSHIFUJI Hideaki if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 912333fad53SYOSHIFUJI Hideaki err = -EINVAL; 913333fad53SYOSHIFUJI Hideaki goto exit_f; 914333fad53SYOSHIFUJI Hideaki } 915333fad53SYOSHIFUJI Hideaki 916333fad53SYOSHIFUJI Hideaki hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 917333fad53SYOSHIFUJI Hideaki len = ((hdr->hdrlen + 1) << 3); 918333fad53SYOSHIFUJI Hideaki if (cmsg->cmsg_len < CMSG_LEN(len)) { 919333fad53SYOSHIFUJI Hideaki err = -EINVAL; 920333fad53SYOSHIFUJI Hideaki goto exit_f; 921333fad53SYOSHIFUJI Hideaki } 922af31f412SEric W. Biederman if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 923333fad53SYOSHIFUJI Hideaki err = -EPERM; 924333fad53SYOSHIFUJI Hideaki goto exit_f; 925333fad53SYOSHIFUJI Hideaki } 926333fad53SYOSHIFUJI Hideaki if (cmsg->cmsg_type == IPV6_DSTOPTS) { 927333fad53SYOSHIFUJI Hideaki opt->opt_flen += len; 928333fad53SYOSHIFUJI Hideaki opt->dst1opt = hdr; 929333fad53SYOSHIFUJI Hideaki } else { 930333fad53SYOSHIFUJI Hideaki opt->opt_nflen += len; 931333fad53SYOSHIFUJI Hideaki opt->dst0opt = hdr; 932333fad53SYOSHIFUJI Hideaki } 933333fad53SYOSHIFUJI Hideaki break; 934333fad53SYOSHIFUJI Hideaki 935333fad53SYOSHIFUJI Hideaki case IPV6_2292RTHDR: 9361da177e4SLinus Torvalds case IPV6_RTHDR: 9371da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { 9381da177e4SLinus Torvalds err = -EINVAL; 9391da177e4SLinus Torvalds goto exit_f; 9401da177e4SLinus Torvalds } 9411da177e4SLinus Torvalds 9421da177e4SLinus Torvalds rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); 9431da177e4SLinus Torvalds 944280a9d34SMasahide NAKAMURA switch (rthdr->type) { 94507a93626SAmerigo Wang #if IS_ENABLED(CONFIG_IPV6_MIP6) 946280a9d34SMasahide NAKAMURA case IPV6_SRCRT_TYPE_2: 9476e093d9dSBrian Haley if (rthdr->hdrlen != 2 || 9486e093d9dSBrian Haley rthdr->segments_left != 1) { 9496e093d9dSBrian Haley err = -EINVAL; 9506e093d9dSBrian Haley goto exit_f; 9516e093d9dSBrian Haley } 952280a9d34SMasahide NAKAMURA break; 953bb4dbf9eSYOSHIFUJI Hideaki #endif 954280a9d34SMasahide NAKAMURA default: 9551da177e4SLinus Torvalds err = -EINVAL; 9561da177e4SLinus Torvalds goto exit_f; 9571da177e4SLinus Torvalds } 9581da177e4SLinus Torvalds 9591da177e4SLinus Torvalds len = ((rthdr->hdrlen + 1) << 3); 9601da177e4SLinus Torvalds 9611da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(len)) { 9621da177e4SLinus Torvalds err = -EINVAL; 9631da177e4SLinus Torvalds goto exit_f; 9641da177e4SLinus Torvalds } 9651da177e4SLinus Torvalds 9661da177e4SLinus Torvalds /* segments left must also match */ 9671da177e4SLinus Torvalds if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { 9681da177e4SLinus Torvalds err = -EINVAL; 9691da177e4SLinus Torvalds goto exit_f; 9701da177e4SLinus Torvalds } 9711da177e4SLinus Torvalds 9721da177e4SLinus Torvalds opt->opt_nflen += len; 9731da177e4SLinus Torvalds opt->srcrt = rthdr; 9741da177e4SLinus Torvalds 975333fad53SYOSHIFUJI Hideaki if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { 9761da177e4SLinus Torvalds int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); 9771da177e4SLinus Torvalds 9781da177e4SLinus Torvalds opt->opt_nflen += dsthdrlen; 9791da177e4SLinus Torvalds opt->dst0opt = opt->dst1opt; 9801da177e4SLinus Torvalds opt->dst1opt = NULL; 9811da177e4SLinus Torvalds opt->opt_flen -= dsthdrlen; 9821da177e4SLinus Torvalds } 9831da177e4SLinus Torvalds 9841da177e4SLinus Torvalds break; 9851da177e4SLinus Torvalds 986333fad53SYOSHIFUJI Hideaki case IPV6_2292HOPLIMIT: 9871da177e4SLinus Torvalds case IPV6_HOPLIMIT: 9881da177e4SLinus Torvalds if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 9891da177e4SLinus Torvalds err = -EINVAL; 9901da177e4SLinus Torvalds goto exit_f; 9911da177e4SLinus Torvalds } 9921da177e4SLinus Torvalds 99326879da5SWei Wang ipc6->hlimit = *(int *)CMSG_DATA(cmsg); 99426879da5SWei Wang if (ipc6->hlimit < -1 || ipc6->hlimit > 0xff) { 995e8766fc8SShan Wei err = -EINVAL; 996e8766fc8SShan Wei goto exit_f; 997e8766fc8SShan Wei } 998e8766fc8SShan Wei 9991da177e4SLinus Torvalds break; 10001da177e4SLinus Torvalds 100141a1f8eaSYOSHIFUJI Hideaki case IPV6_TCLASS: 100241a1f8eaSYOSHIFUJI Hideaki { 100341a1f8eaSYOSHIFUJI Hideaki int tc; 100441a1f8eaSYOSHIFUJI Hideaki 100541a1f8eaSYOSHIFUJI Hideaki err = -EINVAL; 1006b5a4257cSEldad Zack if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 100741a1f8eaSYOSHIFUJI Hideaki goto exit_f; 100841a1f8eaSYOSHIFUJI Hideaki 100941a1f8eaSYOSHIFUJI Hideaki tc = *(int *)CMSG_DATA(cmsg); 1010d0ee011fSRemi Denis-Courmont if (tc < -1 || tc > 0xff) 101141a1f8eaSYOSHIFUJI Hideaki goto exit_f; 101241a1f8eaSYOSHIFUJI Hideaki 101341a1f8eaSYOSHIFUJI Hideaki err = 0; 101426879da5SWei Wang ipc6->tclass = tc; 101541a1f8eaSYOSHIFUJI Hideaki 101641a1f8eaSYOSHIFUJI Hideaki break; 101741a1f8eaSYOSHIFUJI Hideaki } 101813b52cd4SBrian Haley 101913b52cd4SBrian Haley case IPV6_DONTFRAG: 102013b52cd4SBrian Haley { 102113b52cd4SBrian Haley int df; 102213b52cd4SBrian Haley 102313b52cd4SBrian Haley err = -EINVAL; 1024b5a4257cSEldad Zack if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 102513b52cd4SBrian Haley goto exit_f; 102613b52cd4SBrian Haley 102713b52cd4SBrian Haley df = *(int *)CMSG_DATA(cmsg); 102813b52cd4SBrian Haley if (df < 0 || df > 1) 102913b52cd4SBrian Haley goto exit_f; 103013b52cd4SBrian Haley 103113b52cd4SBrian Haley err = 0; 103226879da5SWei Wang ipc6->dontfrag = df; 103313b52cd4SBrian Haley 103413b52cd4SBrian Haley break; 103513b52cd4SBrian Haley } 10361da177e4SLinus Torvalds default: 1037ba7a46f1SJoe Perches net_dbg_ratelimited("invalid cmsg type: %d\n", 103864ce2073SPatrick McHardy cmsg->cmsg_type); 10391da177e4SLinus Torvalds err = -EINVAL; 10404a36702eSMiao Xie goto exit_f; 10413ff50b79SStephen Hemminger } 10421da177e4SLinus Torvalds } 10431da177e4SLinus Torvalds 10441da177e4SLinus Torvalds exit_f: 10451da177e4SLinus Torvalds return err; 10461da177e4SLinus Torvalds } 104773df66f8STom Parkin EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl); 104817ef66afSLorenzo Colitti 10496c206b20SPaolo Abeni void __ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp, 10506c206b20SPaolo Abeni __u16 srcp, __u16 destp, int rqueue, int bucket) 105117ef66afSLorenzo Colitti { 105217ef66afSLorenzo Colitti const struct in6_addr *dest, *src; 105317ef66afSLorenzo Colitti 1054efe4208fSEric Dumazet dest = &sp->sk_v6_daddr; 1055efe4208fSEric Dumazet src = &sp->sk_v6_rcv_saddr; 105617ef66afSLorenzo Colitti seq_printf(seq, 105717ef66afSLorenzo Colitti "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 1058ea9a0379SPatrick Talbert "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %u\n", 105917ef66afSLorenzo Colitti bucket, 106017ef66afSLorenzo Colitti src->s6_addr32[0], src->s6_addr32[1], 106117ef66afSLorenzo Colitti src->s6_addr32[2], src->s6_addr32[3], srcp, 106217ef66afSLorenzo Colitti dest->s6_addr32[0], dest->s6_addr32[1], 106317ef66afSLorenzo Colitti dest->s6_addr32[2], dest->s6_addr32[3], destp, 106417ef66afSLorenzo Colitti sp->sk_state, 106517ef66afSLorenzo Colitti sk_wmem_alloc_get(sp), 10666c206b20SPaolo Abeni rqueue, 106717ef66afSLorenzo Colitti 0, 0L, 0, 106817ef66afSLorenzo Colitti from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), 106917ef66afSLorenzo Colitti 0, 107017ef66afSLorenzo Colitti sock_i_ino(sp), 107141c6d650SReshetova, Elena refcount_read(&sp->sk_refcnt), sp, 107217ef66afSLorenzo Colitti atomic_read(&sp->sk_drops)); 107317ef66afSLorenzo Colitti } 1074