11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * common UDP/RAW code 31da177e4SLinus Torvalds * Linux INET6 implementation 41da177e4SLinus Torvalds * 51da177e4SLinus Torvalds * Authors: 61da177e4SLinus Torvalds * Pedro Roque <roque@di.fc.ul.pt> 71da177e4SLinus Torvalds * 81da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or 91da177e4SLinus Torvalds * modify it under the terms of the GNU General Public License 101da177e4SLinus Torvalds * as published by the Free Software Foundation; either version 111da177e4SLinus Torvalds * 2 of the License, or (at your option) any later version. 121da177e4SLinus Torvalds */ 131da177e4SLinus Torvalds 144fc268d2SRandy Dunlap #include <linux/capability.h> 151da177e4SLinus Torvalds #include <linux/errno.h> 161da177e4SLinus Torvalds #include <linux/types.h> 171da177e4SLinus Torvalds #include <linux/kernel.h> 181da177e4SLinus Torvalds #include <linux/interrupt.h> 191da177e4SLinus Torvalds #include <linux/socket.h> 201da177e4SLinus Torvalds #include <linux/sockios.h> 211da177e4SLinus Torvalds #include <linux/in6.h> 221da177e4SLinus Torvalds #include <linux/ipv6.h> 231da177e4SLinus Torvalds #include <linux/route.h> 245a0e3ad6STejun Heo #include <linux/slab.h> 25a495f836SChris Elston #include <linux/export.h> 261da177e4SLinus Torvalds 271da177e4SLinus Torvalds #include <net/ipv6.h> 281da177e4SLinus Torvalds #include <net/ndisc.h> 291da177e4SLinus Torvalds #include <net/addrconf.h> 301da177e4SLinus Torvalds #include <net/transp_v6.h> 311da177e4SLinus Torvalds #include <net/ip6_route.h> 32c752f073SArnaldo Carvalho de Melo #include <net/tcp_states.h> 33e7219858SYOSHIFUJI Hideaki / 吉藤英明 #include <net/dsfield.h> 341da177e4SLinus Torvalds 351da177e4SLinus Torvalds #include <linux/errqueue.h> 361da177e4SLinus Torvalds #include <asm/uaccess.h> 371da177e4SLinus Torvalds 38a50feda5SEric Dumazet static bool ipv6_mapped_addr_any(const struct in6_addr *a) 39c15fea2dSMax Matveev { 40a50feda5SEric Dumazet return ipv6_addr_v4mapped(a) && (a->s6_addr32[3] == 0); 41c15fea2dSMax Matveev } 42c15fea2dSMax Matveev 4380fbdb20SMartin KaFai Lau static void ip6_datagram_flow_key_init(struct flowi6 *fl6, struct sock *sk) 4480fbdb20SMartin KaFai Lau { 4580fbdb20SMartin KaFai Lau struct inet_sock *inet = inet_sk(sk); 4680fbdb20SMartin KaFai Lau struct ipv6_pinfo *np = inet6_sk(sk); 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_oif = sk->sk_bound_dev_if; 5380fbdb20SMartin KaFai Lau fl6->flowi6_mark = sk->sk_mark; 5480fbdb20SMartin KaFai Lau fl6->fl6_dport = inet->inet_dport; 5580fbdb20SMartin KaFai Lau fl6->fl6_sport = inet->inet_sport; 5680fbdb20SMartin KaFai Lau fl6->flowlabel = np->flow_label; 5780fbdb20SMartin KaFai Lau 5880fbdb20SMartin KaFai Lau if (!fl6->flowi6_oif) 5980fbdb20SMartin KaFai Lau fl6->flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; 6080fbdb20SMartin KaFai Lau 6180fbdb20SMartin KaFai Lau if (!fl6->flowi6_oif && ipv6_addr_is_multicast(&fl6->daddr)) 6280fbdb20SMartin KaFai Lau fl6->flowi6_oif = np->mcast_oif; 6380fbdb20SMartin KaFai Lau 6480fbdb20SMartin KaFai Lau security_sk_classify_flow(sk, flowi6_to_flowi(fl6)); 6580fbdb20SMartin KaFai Lau } 6680fbdb20SMartin KaFai Lau 6733c162a9SMartin KaFai Lau int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr) 687e2040dbSMartin KaFai Lau { 697e2040dbSMartin KaFai Lau struct ip6_flowlabel *flowlabel = NULL; 707e2040dbSMartin KaFai Lau struct in6_addr *final_p, final; 717e2040dbSMartin KaFai Lau struct ipv6_txoptions *opt; 727e2040dbSMartin KaFai Lau struct dst_entry *dst; 737e2040dbSMartin KaFai Lau struct inet_sock *inet = inet_sk(sk); 747e2040dbSMartin KaFai Lau struct ipv6_pinfo *np = inet6_sk(sk); 757e2040dbSMartin KaFai Lau struct flowi6 fl6; 767e2040dbSMartin KaFai Lau int err = 0; 777e2040dbSMartin KaFai Lau 787e2040dbSMartin KaFai Lau if (np->sndflow && (np->flow_label & IPV6_FLOWLABEL_MASK)) { 797e2040dbSMartin KaFai Lau flowlabel = fl6_sock_lookup(sk, np->flow_label); 807e2040dbSMartin KaFai Lau if (!flowlabel) 817e2040dbSMartin KaFai Lau return -EINVAL; 827e2040dbSMartin KaFai Lau } 837e2040dbSMartin KaFai Lau ip6_datagram_flow_key_init(&fl6, sk); 847e2040dbSMartin KaFai Lau 857e2040dbSMartin KaFai Lau rcu_read_lock(); 867e2040dbSMartin KaFai Lau opt = flowlabel ? flowlabel->opt : rcu_dereference(np->opt); 877e2040dbSMartin KaFai Lau final_p = fl6_update_dst(&fl6, opt, &final); 887e2040dbSMartin KaFai Lau rcu_read_unlock(); 897e2040dbSMartin KaFai Lau 907e2040dbSMartin KaFai Lau dst = ip6_dst_lookup_flow(sk, &fl6, final_p); 917e2040dbSMartin KaFai Lau if (IS_ERR(dst)) { 927e2040dbSMartin KaFai Lau err = PTR_ERR(dst); 937e2040dbSMartin KaFai Lau goto out; 947e2040dbSMartin KaFai Lau } 957e2040dbSMartin KaFai Lau 9633c162a9SMartin KaFai Lau if (fix_sk_saddr) { 977e2040dbSMartin KaFai Lau if (ipv6_addr_any(&np->saddr)) 987e2040dbSMartin KaFai Lau np->saddr = fl6.saddr; 997e2040dbSMartin KaFai Lau 1007e2040dbSMartin KaFai Lau if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { 1017e2040dbSMartin KaFai Lau sk->sk_v6_rcv_saddr = fl6.saddr; 1027e2040dbSMartin KaFai Lau inet->inet_rcv_saddr = LOOPBACK4_IPV6; 1037e2040dbSMartin KaFai Lau if (sk->sk_prot->rehash) 1047e2040dbSMartin KaFai Lau sk->sk_prot->rehash(sk); 1057e2040dbSMartin KaFai Lau } 10633c162a9SMartin KaFai Lau } 1077e2040dbSMartin KaFai Lau 1087e2040dbSMartin KaFai Lau ip6_dst_store(sk, dst, 1097e2040dbSMartin KaFai Lau ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ? 1107e2040dbSMartin KaFai Lau &sk->sk_v6_daddr : NULL, 1117e2040dbSMartin KaFai Lau #ifdef CONFIG_IPV6_SUBTREES 1127e2040dbSMartin KaFai Lau ipv6_addr_equal(&fl6.saddr, &np->saddr) ? 1137e2040dbSMartin KaFai Lau &np->saddr : 1147e2040dbSMartin KaFai Lau #endif 1157e2040dbSMartin KaFai Lau NULL); 1167e2040dbSMartin KaFai Lau 1177e2040dbSMartin KaFai Lau out: 1187e2040dbSMartin KaFai Lau fl6_sock_release(flowlabel); 1197e2040dbSMartin KaFai Lau return err; 1207e2040dbSMartin KaFai Lau } 1217e2040dbSMartin KaFai Lau 12203645a11SEric Dumazet static int __ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) 1231da177e4SLinus Torvalds { 1241da177e4SLinus Torvalds struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; 1251da177e4SLinus Torvalds struct inet_sock *inet = inet_sk(sk); 1261da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 1277e2040dbSMartin KaFai Lau struct in6_addr *daddr; 1281da177e4SLinus Torvalds int addr_type; 1291da177e4SLinus Torvalds int err; 13080fbdb20SMartin KaFai Lau __be32 fl6_flowlabel = 0; 1311da177e4SLinus Torvalds 1321da177e4SLinus Torvalds if (usin->sin6_family == AF_INET) { 1331da177e4SLinus Torvalds if (__ipv6_only_sock(sk)) 1341da177e4SLinus Torvalds return -EAFNOSUPPORT; 13503645a11SEric Dumazet err = __ip4_datagram_connect(sk, uaddr, addr_len); 1361da177e4SLinus Torvalds goto ipv4_connected; 1371da177e4SLinus Torvalds } 1381da177e4SLinus Torvalds 1391da177e4SLinus Torvalds if (addr_len < SIN6_LEN_RFC2133) 1401da177e4SLinus Torvalds return -EINVAL; 1411da177e4SLinus Torvalds 1421da177e4SLinus Torvalds if (usin->sin6_family != AF_INET6) 1431da177e4SLinus Torvalds return -EAFNOSUPPORT; 1441da177e4SLinus Torvalds 1457e2040dbSMartin KaFai Lau if (np->sndflow) 14680fbdb20SMartin KaFai Lau fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK; 1471da177e4SLinus Torvalds 1481da177e4SLinus Torvalds addr_type = ipv6_addr_type(&usin->sin6_addr); 1491da177e4SLinus Torvalds 1501da177e4SLinus Torvalds if (addr_type == IPV6_ADDR_ANY) { 1511da177e4SLinus Torvalds /* 1521da177e4SLinus Torvalds * connect to self 1531da177e4SLinus Torvalds */ 1541da177e4SLinus Torvalds usin->sin6_addr.s6_addr[15] = 0x01; 1551da177e4SLinus Torvalds } 1561da177e4SLinus Torvalds 1571da177e4SLinus Torvalds daddr = &usin->sin6_addr; 1581da177e4SLinus Torvalds 1591da177e4SLinus Torvalds if (addr_type == IPV6_ADDR_MAPPED) { 1601da177e4SLinus Torvalds struct sockaddr_in sin; 1611da177e4SLinus Torvalds 1621da177e4SLinus Torvalds if (__ipv6_only_sock(sk)) { 1631da177e4SLinus Torvalds err = -ENETUNREACH; 1641da177e4SLinus Torvalds goto out; 1651da177e4SLinus Torvalds } 1661da177e4SLinus Torvalds sin.sin_family = AF_INET; 1671da177e4SLinus Torvalds sin.sin_addr.s_addr = daddr->s6_addr32[3]; 1681da177e4SLinus Torvalds sin.sin_port = usin->sin6_port; 1691da177e4SLinus Torvalds 17003645a11SEric Dumazet err = __ip4_datagram_connect(sk, 1711da177e4SLinus Torvalds (struct sockaddr *) &sin, 1721da177e4SLinus Torvalds sizeof(sin)); 1731da177e4SLinus Torvalds 1741da177e4SLinus Torvalds ipv4_connected: 1751da177e4SLinus Torvalds if (err) 1761da177e4SLinus Torvalds goto out; 1771da177e4SLinus Torvalds 178efe4208fSEric Dumazet ipv6_addr_set_v4mapped(inet->inet_daddr, &sk->sk_v6_daddr); 1791da177e4SLinus Torvalds 180c15fea2dSMax Matveev if (ipv6_addr_any(&np->saddr) || 181c15fea2dSMax Matveev ipv6_mapped_addr_any(&np->saddr)) 182c720c7e8SEric Dumazet ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); 1831da177e4SLinus Torvalds 184efe4208fSEric Dumazet if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) || 185efe4208fSEric Dumazet ipv6_mapped_addr_any(&sk->sk_v6_rcv_saddr)) { 186c720c7e8SEric Dumazet ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, 187efe4208fSEric Dumazet &sk->sk_v6_rcv_saddr); 188719f8358SEric Dumazet if (sk->sk_prot->rehash) 189719f8358SEric Dumazet sk->sk_prot->rehash(sk); 190719f8358SEric Dumazet } 191b301e82cSBrian Haley 1921da177e4SLinus Torvalds goto out; 1931da177e4SLinus Torvalds } 1941da177e4SLinus Torvalds 195842df073SHannes Frederic Sowa if (__ipv6_addr_needs_scope_id(addr_type)) { 1961da177e4SLinus Torvalds if (addr_len >= sizeof(struct sockaddr_in6) && 1971da177e4SLinus Torvalds usin->sin6_scope_id) { 1981da177e4SLinus Torvalds if (sk->sk_bound_dev_if && 1991da177e4SLinus Torvalds sk->sk_bound_dev_if != usin->sin6_scope_id) { 2001da177e4SLinus Torvalds err = -EINVAL; 2011da177e4SLinus Torvalds goto out; 2021da177e4SLinus Torvalds } 2031da177e4SLinus Torvalds sk->sk_bound_dev_if = usin->sin6_scope_id; 2041da177e4SLinus Torvalds } 2051da177e4SLinus Torvalds 2061ac4f008SBrian Haley if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST)) 2071ac4f008SBrian Haley sk->sk_bound_dev_if = np->mcast_oif; 2081ac4f008SBrian Haley 2091da177e4SLinus Torvalds /* Connect to link-local address requires an interface */ 2101da177e4SLinus Torvalds if (!sk->sk_bound_dev_if) { 2111da177e4SLinus Torvalds err = -EINVAL; 2121da177e4SLinus Torvalds goto out; 2131da177e4SLinus Torvalds } 2141da177e4SLinus Torvalds } 2151da177e4SLinus Torvalds 216efe4208fSEric Dumazet sk->sk_v6_daddr = *daddr; 21780fbdb20SMartin KaFai Lau np->flow_label = fl6_flowlabel; 2181da177e4SLinus Torvalds 219c720c7e8SEric Dumazet inet->inet_dport = usin->sin6_port; 2201da177e4SLinus Torvalds 2211da177e4SLinus Torvalds /* 2221da177e4SLinus Torvalds * Check for a route to destination an obtain the 2231da177e4SLinus Torvalds * destination cache for it. 2241da177e4SLinus Torvalds */ 2251da177e4SLinus Torvalds 22633c162a9SMartin KaFai Lau err = ip6_datagram_dst_update(sk, true); 2277e2040dbSMartin KaFai Lau if (err) 2281da177e4SLinus Torvalds goto out; 2291da177e4SLinus Torvalds 2301da177e4SLinus Torvalds sk->sk_state = TCP_ESTABLISHED; 231877d1f62STom Herbert sk_set_txhash(sk); 2321da177e4SLinus Torvalds out: 2331da177e4SLinus Torvalds return err; 2341da177e4SLinus Torvalds } 23503645a11SEric Dumazet 23603645a11SEric Dumazet int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) 23703645a11SEric Dumazet { 23803645a11SEric Dumazet int res; 23903645a11SEric Dumazet 24003645a11SEric Dumazet lock_sock(sk); 24103645a11SEric Dumazet res = __ip6_datagram_connect(sk, uaddr, addr_len); 24203645a11SEric Dumazet release_sock(sk); 24303645a11SEric Dumazet return res; 24403645a11SEric Dumazet } 245a495f836SChris Elston EXPORT_SYMBOL_GPL(ip6_datagram_connect); 2461da177e4SLinus Torvalds 24782b276cdSHannes Frederic Sowa int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr, 24882b276cdSHannes Frederic Sowa int addr_len) 24982b276cdSHannes Frederic Sowa { 25082b276cdSHannes Frederic Sowa DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr); 25182b276cdSHannes Frederic Sowa if (sin6->sin6_family != AF_INET6) 25282b276cdSHannes Frederic Sowa return -EAFNOSUPPORT; 25382b276cdSHannes Frederic Sowa return ip6_datagram_connect(sk, uaddr, addr_len); 25482b276cdSHannes Frederic Sowa } 25582b276cdSHannes Frederic Sowa EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only); 25682b276cdSHannes Frederic Sowa 2571da177e4SLinus Torvalds void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 258e69a4adcSAl Viro __be16 port, u32 info, u8 *payload) 2591da177e4SLinus Torvalds { 2601da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 261cc70ab26SArnaldo Carvalho de Melo struct icmp6hdr *icmph = icmp6_hdr(skb); 2621da177e4SLinus Torvalds struct sock_exterr_skb *serr; 2631da177e4SLinus Torvalds 2641da177e4SLinus Torvalds if (!np->recverr) 2651da177e4SLinus Torvalds return; 2661da177e4SLinus Torvalds 2671da177e4SLinus Torvalds skb = skb_clone(skb, GFP_ATOMIC); 2681da177e4SLinus Torvalds if (!skb) 2691da177e4SLinus Torvalds return; 2701da177e4SLinus Torvalds 271d40a4de0SBrian Haley skb->protocol = htons(ETH_P_IPV6); 272d40a4de0SBrian Haley 2731da177e4SLinus Torvalds serr = SKB_EXT_ERR(skb); 2741da177e4SLinus Torvalds serr->ee.ee_errno = err; 2751da177e4SLinus Torvalds serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6; 2761da177e4SLinus Torvalds serr->ee.ee_type = icmph->icmp6_type; 2771da177e4SLinus Torvalds serr->ee.ee_code = icmph->icmp6_code; 2781da177e4SLinus Torvalds serr->ee.ee_pad = 0; 2791da177e4SLinus Torvalds serr->ee.ee_info = info; 2801da177e4SLinus Torvalds serr->ee.ee_data = 0; 281d56f90a7SArnaldo Carvalho de Melo serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) - 282d56f90a7SArnaldo Carvalho de Melo skb_network_header(skb); 2831da177e4SLinus Torvalds serr->port = port; 2841da177e4SLinus Torvalds 2851da177e4SLinus Torvalds __skb_pull(skb, payload - skb->data); 286bd82393cSArnaldo Carvalho de Melo skb_reset_transport_header(skb); 2871da177e4SLinus Torvalds 2881da177e4SLinus Torvalds if (sock_queue_err_skb(sk, skb)) 2891da177e4SLinus Torvalds kfree_skb(skb); 2901da177e4SLinus Torvalds } 2911da177e4SLinus Torvalds 2924c9483b2SDavid S. Miller void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info) 2931da177e4SLinus Torvalds { 2941c1e9d2bSEric Dumazet const struct ipv6_pinfo *np = inet6_sk(sk); 2951da177e4SLinus Torvalds struct sock_exterr_skb *serr; 2961da177e4SLinus Torvalds struct ipv6hdr *iph; 2971da177e4SLinus Torvalds struct sk_buff *skb; 2981da177e4SLinus Torvalds 2991da177e4SLinus Torvalds if (!np->recverr) 3001da177e4SLinus Torvalds return; 3011da177e4SLinus Torvalds 3021da177e4SLinus Torvalds skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 3031da177e4SLinus Torvalds if (!skb) 3041da177e4SLinus Torvalds return; 3051da177e4SLinus Torvalds 306d40a4de0SBrian Haley skb->protocol = htons(ETH_P_IPV6); 307d40a4de0SBrian Haley 3081ced98e8SArnaldo Carvalho de Melo skb_put(skb, sizeof(struct ipv6hdr)); 3091ced98e8SArnaldo Carvalho de Melo skb_reset_network_header(skb); 3100660e03fSArnaldo Carvalho de Melo iph = ipv6_hdr(skb); 3114e3fd7a0SAlexey Dobriyan iph->daddr = fl6->daddr; 3121da177e4SLinus Torvalds 3131da177e4SLinus Torvalds serr = SKB_EXT_ERR(skb); 3141da177e4SLinus Torvalds serr->ee.ee_errno = err; 3151da177e4SLinus Torvalds serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 3161da177e4SLinus Torvalds serr->ee.ee_type = 0; 3171da177e4SLinus Torvalds serr->ee.ee_code = 0; 3181da177e4SLinus Torvalds serr->ee.ee_pad = 0; 3191da177e4SLinus Torvalds serr->ee.ee_info = info; 3201da177e4SLinus Torvalds serr->ee.ee_data = 0; 321d56f90a7SArnaldo Carvalho de Melo serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); 3221958b856SDavid S. Miller serr->port = fl6->fl6_dport; 3231da177e4SLinus Torvalds 32427a884dcSArnaldo Carvalho de Melo __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 325bd82393cSArnaldo Carvalho de Melo skb_reset_transport_header(skb); 3261da177e4SLinus Torvalds 3271da177e4SLinus Torvalds if (sock_queue_err_skb(sk, skb)) 3281da177e4SLinus Torvalds kfree_skb(skb); 3291da177e4SLinus Torvalds } 3301da177e4SLinus Torvalds 3314c9483b2SDavid S. Miller void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu) 3324b340ae2SBrian Haley { 3334b340ae2SBrian Haley struct ipv6_pinfo *np = inet6_sk(sk); 3344b340ae2SBrian Haley struct ipv6hdr *iph; 3354b340ae2SBrian Haley struct sk_buff *skb; 3364b340ae2SBrian Haley struct ip6_mtuinfo *mtu_info; 3374b340ae2SBrian Haley 3384b340ae2SBrian Haley if (!np->rxopt.bits.rxpmtu) 3394b340ae2SBrian Haley return; 3404b340ae2SBrian Haley 3414b340ae2SBrian Haley skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 3424b340ae2SBrian Haley if (!skb) 3434b340ae2SBrian Haley return; 3444b340ae2SBrian Haley 3454b340ae2SBrian Haley skb_put(skb, sizeof(struct ipv6hdr)); 3464b340ae2SBrian Haley skb_reset_network_header(skb); 3474b340ae2SBrian Haley iph = ipv6_hdr(skb); 3484e3fd7a0SAlexey Dobriyan iph->daddr = fl6->daddr; 3494b340ae2SBrian Haley 3504b340ae2SBrian Haley mtu_info = IP6CBMTU(skb); 3514b340ae2SBrian Haley 3524b340ae2SBrian Haley mtu_info->ip6m_mtu = mtu; 3534b340ae2SBrian Haley mtu_info->ip6m_addr.sin6_family = AF_INET6; 3544b340ae2SBrian Haley mtu_info->ip6m_addr.sin6_port = 0; 3554b340ae2SBrian Haley mtu_info->ip6m_addr.sin6_flowinfo = 0; 3564c9483b2SDavid S. Miller mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif; 3574e3fd7a0SAlexey Dobriyan mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr; 3584b340ae2SBrian Haley 3594b340ae2SBrian Haley __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 3604b340ae2SBrian Haley skb_reset_transport_header(skb); 3614b340ae2SBrian Haley 3624b340ae2SBrian Haley skb = xchg(&np->rxpmtu, skb); 3634b340ae2SBrian Haley kfree_skb(skb); 3644b340ae2SBrian Haley } 3654b340ae2SBrian Haley 36634b99df4SJulian Anastasov /* For some errors we have valid addr_offset even with zero payload and 36734b99df4SJulian Anastasov * zero port. Also, addr_offset should be supported if port is set. 36834b99df4SJulian Anastasov */ 36934b99df4SJulian Anastasov static inline bool ipv6_datagram_support_addr(struct sock_exterr_skb *serr) 37034b99df4SJulian Anastasov { 37134b99df4SJulian Anastasov return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6 || 37234b99df4SJulian Anastasov serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || 37334b99df4SJulian Anastasov serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port; 37434b99df4SJulian Anastasov } 37534b99df4SJulian Anastasov 376c247f053SWillem de Bruijn /* IPv6 supports cmsg on all origins aside from SO_EE_ORIGIN_LOCAL. 377c247f053SWillem de Bruijn * 378c247f053SWillem de Bruijn * At one point, excluding local errors was a quick test to identify icmp/icmp6 379c247f053SWillem de Bruijn * errors. This is no longer true, but the test remained, so the v6 stack, 380c247f053SWillem de Bruijn * unlike v4, also honors cmsg requests on all wifi and timestamp errors. 381c247f053SWillem de Bruijn * 382c247f053SWillem de Bruijn * Timestamp code paths do not initialize the fields expected by cmsg: 383c247f053SWillem de Bruijn * the PKTINFO fields in skb->cb[]. Fill those in here. 384c247f053SWillem de Bruijn */ 385c247f053SWillem de Bruijn static bool ip6_datagram_support_cmsg(struct sk_buff *skb, 386c247f053SWillem de Bruijn struct sock_exterr_skb *serr) 387829ae9d6SWillem de Bruijn { 388c247f053SWillem de Bruijn if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || 389c247f053SWillem de Bruijn serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) 390c247f053SWillem de Bruijn return true; 391c247f053SWillem de Bruijn 392c247f053SWillem de Bruijn if (serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL) 393c247f053SWillem de Bruijn return false; 394c247f053SWillem de Bruijn 395c247f053SWillem de Bruijn if (!skb->dev) 396c247f053SWillem de Bruijn return false; 397829ae9d6SWillem de Bruijn 398829ae9d6SWillem de Bruijn if (skb->protocol == htons(ETH_P_IPV6)) 399c247f053SWillem de Bruijn IP6CB(skb)->iif = skb->dev->ifindex; 400829ae9d6SWillem de Bruijn else 401c247f053SWillem de Bruijn PKTINFO_SKB_CB(skb)->ipi_ifindex = skb->dev->ifindex; 402c247f053SWillem de Bruijn 403c247f053SWillem de Bruijn return true; 404829ae9d6SWillem de Bruijn } 405829ae9d6SWillem de Bruijn 4061da177e4SLinus Torvalds /* 4071da177e4SLinus Torvalds * Handle MSG_ERRQUEUE 4081da177e4SLinus Torvalds */ 40985fbaa75SHannes Frederic Sowa int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 4101da177e4SLinus Torvalds { 4111da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 4121da177e4SLinus Torvalds struct sock_exterr_skb *serr; 413364a9e93SWillem de Bruijn struct sk_buff *skb; 414342dfc30SSteffen Hurrle DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); 4151da177e4SLinus Torvalds struct { 4161da177e4SLinus Torvalds struct sock_extended_err ee; 4171da177e4SLinus Torvalds struct sockaddr_in6 offender; 4181da177e4SLinus Torvalds } errhdr; 4191da177e4SLinus Torvalds int err; 4201da177e4SLinus Torvalds int copied; 4211da177e4SLinus Torvalds 4221da177e4SLinus Torvalds err = -EAGAIN; 423364a9e93SWillem de Bruijn skb = sock_dequeue_err_skb(sk); 42463159f29SIan Morris if (!skb) 4251da177e4SLinus Torvalds goto out; 4261da177e4SLinus Torvalds 4271da177e4SLinus Torvalds copied = skb->len; 4281da177e4SLinus Torvalds if (copied > len) { 4291da177e4SLinus Torvalds msg->msg_flags |= MSG_TRUNC; 4301da177e4SLinus Torvalds copied = len; 4311da177e4SLinus Torvalds } 43251f3d02bSDavid S. Miller err = skb_copy_datagram_msg(skb, 0, msg, copied); 4331da177e4SLinus Torvalds if (err) 4341da177e4SLinus Torvalds goto out_free_skb; 4351da177e4SLinus Torvalds 4361da177e4SLinus Torvalds sock_recv_timestamp(msg, sk, skb); 4371da177e4SLinus Torvalds 4381da177e4SLinus Torvalds serr = SKB_EXT_ERR(skb); 4391da177e4SLinus Torvalds 44034b99df4SJulian Anastasov if (sin && ipv6_datagram_support_addr(serr)) { 441d56f90a7SArnaldo Carvalho de Melo const unsigned char *nh = skb_network_header(skb); 4421da177e4SLinus Torvalds sin->sin6_family = AF_INET6; 4431da177e4SLinus Torvalds sin->sin6_flowinfo = 0; 4441da177e4SLinus Torvalds sin->sin6_port = serr->port; 445d40a4de0SBrian Haley if (skb->protocol == htons(ETH_P_IPV6)) { 4466c40d100SYOSHIFUJI Hideaki / 吉藤英明 const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset), 4476c40d100SYOSHIFUJI Hideaki / 吉藤英明 struct ipv6hdr, daddr); 4486c40d100SYOSHIFUJI Hideaki / 吉藤英明 sin->sin6_addr = ip6h->daddr; 4491da177e4SLinus Torvalds if (np->sndflow) 4506502ca52SYOSHIFUJI Hideaki / 吉藤英明 sin->sin6_flowinfo = ip6_flowinfo(ip6h); 451842df073SHannes Frederic Sowa sin->sin6_scope_id = 452842df073SHannes Frederic Sowa ipv6_iface_scope_id(&sin->sin6_addr, 453842df073SHannes Frederic Sowa IP6CB(skb)->iif); 4541da177e4SLinus Torvalds } else { 455b301e82cSBrian Haley ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset), 456b301e82cSBrian Haley &sin->sin6_addr); 457842df073SHannes Frederic Sowa sin->sin6_scope_id = 0; 4581da177e4SLinus Torvalds } 45985fbaa75SHannes Frederic Sowa *addr_len = sizeof(*sin); 4601da177e4SLinus Torvalds } 4611da177e4SLinus Torvalds 4621da177e4SLinus Torvalds memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 4631da177e4SLinus Torvalds sin = &errhdr.offender; 464f812116bSWillem de Bruijn memset(sin, 0, sizeof(*sin)); 465c247f053SWillem de Bruijn 466c247f053SWillem de Bruijn if (ip6_datagram_support_cmsg(skb, serr)) { 4671da177e4SLinus Torvalds sin->sin6_family = AF_INET6; 468c247f053SWillem de Bruijn if (np->rxopt.all) 4694b261c75SHannes Frederic Sowa ip6_datagram_recv_common_ctl(sk, msg, skb); 470d40a4de0SBrian Haley if (skb->protocol == htons(ETH_P_IPV6)) { 4714e3fd7a0SAlexey Dobriyan sin->sin6_addr = ipv6_hdr(skb)->saddr; 4721da177e4SLinus Torvalds if (np->rxopt.all) 4734b261c75SHannes Frederic Sowa ip6_datagram_recv_specific_ctl(sk, msg, skb); 474842df073SHannes Frederic Sowa sin->sin6_scope_id = 475842df073SHannes Frederic Sowa ipv6_iface_scope_id(&sin->sin6_addr, 476842df073SHannes Frederic Sowa IP6CB(skb)->iif); 4771da177e4SLinus Torvalds } else { 478b301e82cSBrian Haley ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 479b301e82cSBrian Haley &sin->sin6_addr); 480f812116bSWillem de Bruijn if (inet_sk(sk)->cmsg_flags) 4811da177e4SLinus Torvalds ip_cmsg_recv(msg, skb); 4821da177e4SLinus Torvalds } 4831da177e4SLinus Torvalds } 4841da177e4SLinus Torvalds 4851da177e4SLinus Torvalds put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr); 4861da177e4SLinus Torvalds 4871da177e4SLinus Torvalds /* Now we could try to dump offended packet options */ 4881da177e4SLinus Torvalds 4891da177e4SLinus Torvalds msg->msg_flags |= MSG_ERRQUEUE; 4901da177e4SLinus Torvalds err = copied; 4911da177e4SLinus Torvalds 4921da177e4SLinus Torvalds out_free_skb: 4931da177e4SLinus Torvalds kfree_skb(skb); 4941da177e4SLinus Torvalds out: 4951da177e4SLinus Torvalds return err; 4961da177e4SLinus Torvalds } 497a495f836SChris Elston EXPORT_SYMBOL_GPL(ipv6_recv_error); 4981da177e4SLinus Torvalds 4994b340ae2SBrian Haley /* 5004b340ae2SBrian Haley * Handle IPV6_RECVPATHMTU 5014b340ae2SBrian Haley */ 50285fbaa75SHannes Frederic Sowa int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len, 50385fbaa75SHannes Frederic Sowa int *addr_len) 5044b340ae2SBrian Haley { 5054b340ae2SBrian Haley struct ipv6_pinfo *np = inet6_sk(sk); 5064b340ae2SBrian Haley struct sk_buff *skb; 5074b340ae2SBrian Haley struct ip6_mtuinfo mtu_info; 508342dfc30SSteffen Hurrle DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); 5094b340ae2SBrian Haley int err; 5104b340ae2SBrian Haley int copied; 5114b340ae2SBrian Haley 5124b340ae2SBrian Haley err = -EAGAIN; 5134b340ae2SBrian Haley skb = xchg(&np->rxpmtu, NULL); 51463159f29SIan Morris if (!skb) 5154b340ae2SBrian Haley goto out; 5164b340ae2SBrian Haley 5174b340ae2SBrian Haley copied = skb->len; 5184b340ae2SBrian Haley if (copied > len) { 5194b340ae2SBrian Haley msg->msg_flags |= MSG_TRUNC; 5204b340ae2SBrian Haley copied = len; 5214b340ae2SBrian Haley } 52251f3d02bSDavid S. Miller err = skb_copy_datagram_msg(skb, 0, msg, copied); 5234b340ae2SBrian Haley if (err) 5244b340ae2SBrian Haley goto out_free_skb; 5254b340ae2SBrian Haley 5264b340ae2SBrian Haley sock_recv_timestamp(msg, sk, skb); 5274b340ae2SBrian Haley 5284b340ae2SBrian Haley memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info)); 5294b340ae2SBrian Haley 5304b340ae2SBrian Haley if (sin) { 5314b340ae2SBrian Haley sin->sin6_family = AF_INET6; 5324b340ae2SBrian Haley sin->sin6_flowinfo = 0; 5334b340ae2SBrian Haley sin->sin6_port = 0; 5344b340ae2SBrian Haley sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id; 5354e3fd7a0SAlexey Dobriyan sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr; 53685fbaa75SHannes Frederic Sowa *addr_len = sizeof(*sin); 5374b340ae2SBrian Haley } 5384b340ae2SBrian Haley 5394b340ae2SBrian Haley put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info); 5404b340ae2SBrian Haley 5414b340ae2SBrian Haley err = copied; 5424b340ae2SBrian Haley 5434b340ae2SBrian Haley out_free_skb: 5444b340ae2SBrian Haley kfree_skb(skb); 5454b340ae2SBrian Haley out: 5464b340ae2SBrian Haley return err; 5474b340ae2SBrian Haley } 5481da177e4SLinus Torvalds 5491da177e4SLinus Torvalds 5504b261c75SHannes Frederic Sowa void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg, 5514b261c75SHannes Frederic Sowa struct sk_buff *skb) 5524b261c75SHannes Frederic Sowa { 5534b261c75SHannes Frederic Sowa struct ipv6_pinfo *np = inet6_sk(sk); 5544b261c75SHannes Frederic Sowa bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6); 5554b261c75SHannes Frederic Sowa 5564b261c75SHannes Frederic Sowa if (np->rxopt.bits.rxinfo) { 5574b261c75SHannes Frederic Sowa struct in6_pktinfo src_info; 5584b261c75SHannes Frederic Sowa 5594b261c75SHannes Frederic Sowa if (is_ipv6) { 5604b261c75SHannes Frederic Sowa src_info.ipi6_ifindex = IP6CB(skb)->iif; 5614b261c75SHannes Frederic Sowa src_info.ipi6_addr = ipv6_hdr(skb)->daddr; 5624b261c75SHannes Frederic Sowa } else { 5634b261c75SHannes Frederic Sowa src_info.ipi6_ifindex = 5644b261c75SHannes Frederic Sowa PKTINFO_SKB_CB(skb)->ipi_ifindex; 5654b261c75SHannes Frederic Sowa ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr, 5664b261c75SHannes Frederic Sowa &src_info.ipi6_addr); 5674b261c75SHannes Frederic Sowa } 568829ae9d6SWillem de Bruijn 569829ae9d6SWillem de Bruijn if (src_info.ipi6_ifindex >= 0) 570829ae9d6SWillem de Bruijn put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, 571829ae9d6SWillem de Bruijn sizeof(src_info), &src_info); 5724b261c75SHannes Frederic Sowa } 5734b261c75SHannes Frederic Sowa } 5744b261c75SHannes Frederic Sowa 5754b261c75SHannes Frederic Sowa void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg, 57673df66f8STom Parkin struct sk_buff *skb) 5771da177e4SLinus Torvalds { 5781da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 5791da177e4SLinus Torvalds struct inet6_skb_parm *opt = IP6CB(skb); 580d56f90a7SArnaldo Carvalho de Melo unsigned char *nh = skb_network_header(skb); 5811da177e4SLinus Torvalds 5821da177e4SLinus Torvalds if (np->rxopt.bits.rxhlim) { 5830660e03fSArnaldo Carvalho de Melo int hlim = ipv6_hdr(skb)->hop_limit; 5841da177e4SLinus Torvalds put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 5851da177e4SLinus Torvalds } 5861da177e4SLinus Torvalds 58741a1f8eaSYOSHIFUJI Hideaki if (np->rxopt.bits.rxtclass) { 588e7219858SYOSHIFUJI Hideaki / 吉藤英明 int tclass = ipv6_get_dsfield(ipv6_hdr(skb)); 58941a1f8eaSYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 59041a1f8eaSYOSHIFUJI Hideaki } 59141a1f8eaSYOSHIFUJI Hideaki 5926502ca52SYOSHIFUJI Hideaki / 吉藤英明 if (np->rxopt.bits.rxflow) { 5936502ca52SYOSHIFUJI Hideaki / 吉藤英明 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh); 5946502ca52SYOSHIFUJI Hideaki / 吉藤英明 if (flowinfo) 5951da177e4SLinus Torvalds put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 5961da177e4SLinus Torvalds } 597333fad53SYOSHIFUJI Hideaki 598333fad53SYOSHIFUJI Hideaki /* HbH is allowed only once */ 5998b58a398SFlorian Westphal if (np->rxopt.bits.hopopts && (opt->flags & IP6SKB_HOPBYHOP)) { 6008b58a398SFlorian Westphal u8 *ptr = nh + sizeof(struct ipv6hdr); 6011da177e4SLinus Torvalds put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); 6021da177e4SLinus Torvalds } 603333fad53SYOSHIFUJI Hideaki 604333fad53SYOSHIFUJI Hideaki if (opt->lastopt && 605333fad53SYOSHIFUJI Hideaki (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { 606333fad53SYOSHIFUJI Hideaki /* 607333fad53SYOSHIFUJI Hideaki * Silly enough, but we need to reparse in order to 608333fad53SYOSHIFUJI Hideaki * report extension headers (except for HbH) 609333fad53SYOSHIFUJI Hideaki * in order. 610333fad53SYOSHIFUJI Hideaki * 611333fad53SYOSHIFUJI Hideaki * Also note that IPV6_RECVRTHDRDSTOPTS is NOT 612333fad53SYOSHIFUJI Hideaki * (and WILL NOT be) defined because 613333fad53SYOSHIFUJI Hideaki * IPV6_RECVDSTOPTS is more generic. --yoshfuji 614333fad53SYOSHIFUJI Hideaki */ 615333fad53SYOSHIFUJI Hideaki unsigned int off = sizeof(struct ipv6hdr); 6160660e03fSArnaldo Carvalho de Melo u8 nexthdr = ipv6_hdr(skb)->nexthdr; 617333fad53SYOSHIFUJI Hideaki 618333fad53SYOSHIFUJI Hideaki while (off <= opt->lastopt) { 61995c96174SEric Dumazet unsigned int len; 620d56f90a7SArnaldo Carvalho de Melo u8 *ptr = nh + off; 621333fad53SYOSHIFUJI Hideaki 622333fad53SYOSHIFUJI Hideaki switch (nexthdr) { 623333fad53SYOSHIFUJI Hideaki case IPPROTO_DSTOPTS: 624333fad53SYOSHIFUJI Hideaki nexthdr = ptr[0]; 625333fad53SYOSHIFUJI Hideaki len = (ptr[1] + 1) << 3; 626333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.dstopts) 627333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr); 628333fad53SYOSHIFUJI Hideaki break; 629333fad53SYOSHIFUJI Hideaki case IPPROTO_ROUTING: 630333fad53SYOSHIFUJI Hideaki nexthdr = ptr[0]; 631333fad53SYOSHIFUJI Hideaki len = (ptr[1] + 1) << 3; 632333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.srcrt) 633333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr); 634333fad53SYOSHIFUJI Hideaki break; 635333fad53SYOSHIFUJI Hideaki case IPPROTO_AH: 636333fad53SYOSHIFUJI Hideaki nexthdr = ptr[0]; 637a3059893SVille Nuorvala len = (ptr[1] + 2) << 2; 638333fad53SYOSHIFUJI Hideaki break; 639333fad53SYOSHIFUJI Hideaki default: 640333fad53SYOSHIFUJI Hideaki nexthdr = ptr[0]; 641333fad53SYOSHIFUJI Hideaki len = (ptr[1] + 1) << 3; 642333fad53SYOSHIFUJI Hideaki break; 643333fad53SYOSHIFUJI Hideaki } 644333fad53SYOSHIFUJI Hideaki 645333fad53SYOSHIFUJI Hideaki off += len; 646333fad53SYOSHIFUJI Hideaki } 647333fad53SYOSHIFUJI Hideaki } 648333fad53SYOSHIFUJI Hideaki 649333fad53SYOSHIFUJI Hideaki /* socket options in old style */ 650333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.rxoinfo) { 651333fad53SYOSHIFUJI Hideaki struct in6_pktinfo src_info; 652333fad53SYOSHIFUJI Hideaki 653333fad53SYOSHIFUJI Hideaki src_info.ipi6_ifindex = opt->iif; 6544e3fd7a0SAlexey Dobriyan src_info.ipi6_addr = ipv6_hdr(skb)->daddr; 655333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 656333fad53SYOSHIFUJI Hideaki } 657333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.rxohlim) { 6580660e03fSArnaldo Carvalho de Melo int hlim = ipv6_hdr(skb)->hop_limit; 659333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 660333fad53SYOSHIFUJI Hideaki } 6618b58a398SFlorian Westphal if (np->rxopt.bits.ohopopts && (opt->flags & IP6SKB_HOPBYHOP)) { 6628b58a398SFlorian Westphal u8 *ptr = nh + sizeof(struct ipv6hdr); 663333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr); 664333fad53SYOSHIFUJI Hideaki } 665333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.odstopts && opt->dst0) { 666d56f90a7SArnaldo Carvalho de Melo u8 *ptr = nh + opt->dst0; 667333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 6681da177e4SLinus Torvalds } 669333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.osrcrt && opt->srcrt) { 670d56f90a7SArnaldo Carvalho de Melo struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt); 671333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr); 6721da177e4SLinus Torvalds } 673333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.odstopts && opt->dst1) { 674d56f90a7SArnaldo Carvalho de Melo u8 *ptr = nh + opt->dst1; 675333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 6761da177e4SLinus Torvalds } 6776c468622SBalazs Scheidler if (np->rxopt.bits.rxorigdstaddr) { 6786c468622SBalazs Scheidler struct sockaddr_in6 sin6; 679747465efSEric Dumazet __be16 *ports = (__be16 *) skb_transport_header(skb); 6806c468622SBalazs Scheidler 6816c468622SBalazs Scheidler if (skb_transport_offset(skb) + 4 <= skb->len) { 6826c468622SBalazs Scheidler /* All current transport protocols have the port numbers in the 6836c468622SBalazs Scheidler * first four bytes of the transport header and this function is 6846c468622SBalazs Scheidler * written with this assumption in mind. 6856c468622SBalazs Scheidler */ 6866c468622SBalazs Scheidler 6876c468622SBalazs Scheidler sin6.sin6_family = AF_INET6; 6884e3fd7a0SAlexey Dobriyan sin6.sin6_addr = ipv6_hdr(skb)->daddr; 6896c468622SBalazs Scheidler sin6.sin6_port = ports[1]; 6906c468622SBalazs Scheidler sin6.sin6_flowinfo = 0; 6913868b7aaSHannes Frederic Sowa sin6.sin6_scope_id = 6923868b7aaSHannes Frederic Sowa ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr, 6933868b7aaSHannes Frederic Sowa opt->iif); 6946c468622SBalazs Scheidler 6956c468622SBalazs Scheidler put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6); 6966c468622SBalazs Scheidler } 6976c468622SBalazs Scheidler } 6984b261c75SHannes Frederic Sowa } 6994b261c75SHannes Frederic Sowa 7004b261c75SHannes Frederic Sowa void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg, 7014b261c75SHannes Frederic Sowa struct sk_buff *skb) 7024b261c75SHannes Frederic Sowa { 7034b261c75SHannes Frederic Sowa ip6_datagram_recv_common_ctl(sk, msg, skb); 7044b261c75SHannes Frederic Sowa ip6_datagram_recv_specific_ctl(sk, msg, skb); 7051da177e4SLinus Torvalds } 7068e72d37eSTom Parkin EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl); 7071da177e4SLinus Torvalds 70873df66f8STom Parkin int ip6_datagram_send_ctl(struct net *net, struct sock *sk, 7094c9483b2SDavid S. Miller struct msghdr *msg, struct flowi6 *fl6, 7101da177e4SLinus Torvalds struct ipv6_txoptions *opt, 71113b52cd4SBrian Haley int *hlimit, int *tclass, int *dontfrag) 7121da177e4SLinus Torvalds { 7131da177e4SLinus Torvalds struct in6_pktinfo *src_info; 7141da177e4SLinus Torvalds struct cmsghdr *cmsg; 7151da177e4SLinus Torvalds struct ipv6_rt_hdr *rthdr; 7161da177e4SLinus Torvalds struct ipv6_opt_hdr *hdr; 7171da177e4SLinus Torvalds int len; 7181da177e4SLinus Torvalds int err = 0; 7191da177e4SLinus Torvalds 720f95b414eSGu Zheng for_each_cmsghdr(cmsg, msg) { 7211da177e4SLinus Torvalds int addr_type; 7221da177e4SLinus Torvalds 7231da177e4SLinus Torvalds if (!CMSG_OK(msg, cmsg)) { 7241da177e4SLinus Torvalds err = -EINVAL; 7251da177e4SLinus Torvalds goto exit_f; 7261da177e4SLinus Torvalds } 7271da177e4SLinus Torvalds 7281da177e4SLinus Torvalds if (cmsg->cmsg_level != SOL_IPV6) 7291da177e4SLinus Torvalds continue; 7301da177e4SLinus Torvalds 7311da177e4SLinus Torvalds switch (cmsg->cmsg_type) { 7321da177e4SLinus Torvalds case IPV6_PKTINFO: 733333fad53SYOSHIFUJI Hideaki case IPV6_2292PKTINFO: 734187e3838SYOSHIFUJI Hideaki { 735187e3838SYOSHIFUJI Hideaki struct net_device *dev = NULL; 736187e3838SYOSHIFUJI Hideaki 7371da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { 7381da177e4SLinus Torvalds err = -EINVAL; 7391da177e4SLinus Torvalds goto exit_f; 7401da177e4SLinus Torvalds } 7411da177e4SLinus Torvalds 7421da177e4SLinus Torvalds src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); 7431da177e4SLinus Torvalds 7441da177e4SLinus Torvalds if (src_info->ipi6_ifindex) { 7454c9483b2SDavid S. Miller if (fl6->flowi6_oif && 7464c9483b2SDavid S. Miller src_info->ipi6_ifindex != fl6->flowi6_oif) 7471da177e4SLinus Torvalds return -EINVAL; 7484c9483b2SDavid S. Miller fl6->flowi6_oif = src_info->ipi6_ifindex; 7491da177e4SLinus Torvalds } 7501da177e4SLinus Torvalds 751187e3838SYOSHIFUJI Hideaki addr_type = __ipv6_addr_type(&src_info->ipi6_addr); 7521da177e4SLinus Torvalds 753536b2e92SEric Dumazet rcu_read_lock(); 7544c9483b2SDavid S. Miller if (fl6->flowi6_oif) { 7554c9483b2SDavid S. Miller dev = dev_get_by_index_rcu(net, fl6->flowi6_oif); 756536b2e92SEric Dumazet if (!dev) { 757536b2e92SEric Dumazet rcu_read_unlock(); 7581da177e4SLinus Torvalds return -ENODEV; 759536b2e92SEric Dumazet } 760536b2e92SEric Dumazet } else if (addr_type & IPV6_ADDR_LINKLOCAL) { 761536b2e92SEric Dumazet rcu_read_unlock(); 762187e3838SYOSHIFUJI Hideaki return -EINVAL; 763536b2e92SEric Dumazet } 764187e3838SYOSHIFUJI Hideaki 765187e3838SYOSHIFUJI Hideaki if (addr_type != IPV6_ADDR_ANY) { 766187e3838SYOSHIFUJI Hideaki int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL; 7672563fa59SMaciej Żenczykowski if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) && 768ec0506dbSMaciej Żenczykowski !ipv6_chk_addr(net, &src_info->ipi6_addr, 7697c90cc2dSFX Le Bail strict ? dev : NULL, 0) && 7707c90cc2dSFX Le Bail !ipv6_chk_acast_addr_src(net, dev, 7717c90cc2dSFX Le Bail &src_info->ipi6_addr)) 7721da177e4SLinus Torvalds err = -EINVAL; 773187e3838SYOSHIFUJI Hideaki else 7744e3fd7a0SAlexey Dobriyan fl6->saddr = src_info->ipi6_addr; 7751da177e4SLinus Torvalds } 776187e3838SYOSHIFUJI Hideaki 777536b2e92SEric Dumazet rcu_read_unlock(); 7781da177e4SLinus Torvalds 779187e3838SYOSHIFUJI Hideaki if (err) 780187e3838SYOSHIFUJI Hideaki goto exit_f; 781187e3838SYOSHIFUJI Hideaki 7821da177e4SLinus Torvalds break; 783187e3838SYOSHIFUJI Hideaki } 7841da177e4SLinus Torvalds 7851da177e4SLinus Torvalds case IPV6_FLOWINFO: 7861da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(4)) { 7871da177e4SLinus Torvalds err = -EINVAL; 7881da177e4SLinus Torvalds goto exit_f; 7891da177e4SLinus Torvalds } 7901da177e4SLinus Torvalds 7914c9483b2SDavid S. Miller if (fl6->flowlabel&IPV6_FLOWINFO_MASK) { 7924c9483b2SDavid S. Miller if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { 7931da177e4SLinus Torvalds err = -EINVAL; 7941da177e4SLinus Torvalds goto exit_f; 7951da177e4SLinus Torvalds } 7961da177e4SLinus Torvalds } 7974c9483b2SDavid S. Miller fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg); 7981da177e4SLinus Torvalds break; 7991da177e4SLinus Torvalds 800333fad53SYOSHIFUJI Hideaki case IPV6_2292HOPOPTS: 8011da177e4SLinus Torvalds case IPV6_HOPOPTS: 8021da177e4SLinus Torvalds if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 8031da177e4SLinus Torvalds err = -EINVAL; 8041da177e4SLinus Torvalds goto exit_f; 8051da177e4SLinus Torvalds } 8061da177e4SLinus Torvalds 8071da177e4SLinus Torvalds hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 8081da177e4SLinus Torvalds len = ((hdr->hdrlen + 1) << 3); 8091da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(len)) { 8101da177e4SLinus Torvalds err = -EINVAL; 8111da177e4SLinus Torvalds goto exit_f; 8121da177e4SLinus Torvalds } 813af31f412SEric W. Biederman if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 8141da177e4SLinus Torvalds err = -EPERM; 8151da177e4SLinus Torvalds goto exit_f; 8161da177e4SLinus Torvalds } 8171da177e4SLinus Torvalds opt->opt_nflen += len; 8181da177e4SLinus Torvalds opt->hopopt = hdr; 8191da177e4SLinus Torvalds break; 8201da177e4SLinus Torvalds 821333fad53SYOSHIFUJI Hideaki case IPV6_2292DSTOPTS: 8221da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 8231da177e4SLinus Torvalds err = -EINVAL; 8241da177e4SLinus Torvalds goto exit_f; 8251da177e4SLinus Torvalds } 8261da177e4SLinus Torvalds 8271da177e4SLinus Torvalds hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 8281da177e4SLinus Torvalds len = ((hdr->hdrlen + 1) << 3); 8291da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(len)) { 8301da177e4SLinus Torvalds err = -EINVAL; 8311da177e4SLinus Torvalds goto exit_f; 8321da177e4SLinus Torvalds } 833af31f412SEric W. Biederman if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 8341da177e4SLinus Torvalds err = -EPERM; 8351da177e4SLinus Torvalds goto exit_f; 8361da177e4SLinus Torvalds } 8371da177e4SLinus Torvalds if (opt->dst1opt) { 8381da177e4SLinus Torvalds err = -EINVAL; 8391da177e4SLinus Torvalds goto exit_f; 8401da177e4SLinus Torvalds } 8411da177e4SLinus Torvalds opt->opt_flen += len; 8421da177e4SLinus Torvalds opt->dst1opt = hdr; 8431da177e4SLinus Torvalds break; 8441da177e4SLinus Torvalds 845333fad53SYOSHIFUJI Hideaki case IPV6_DSTOPTS: 846333fad53SYOSHIFUJI Hideaki case IPV6_RTHDRDSTOPTS: 847333fad53SYOSHIFUJI Hideaki if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 848333fad53SYOSHIFUJI Hideaki err = -EINVAL; 849333fad53SYOSHIFUJI Hideaki goto exit_f; 850333fad53SYOSHIFUJI Hideaki } 851333fad53SYOSHIFUJI Hideaki 852333fad53SYOSHIFUJI Hideaki hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 853333fad53SYOSHIFUJI Hideaki len = ((hdr->hdrlen + 1) << 3); 854333fad53SYOSHIFUJI Hideaki if (cmsg->cmsg_len < CMSG_LEN(len)) { 855333fad53SYOSHIFUJI Hideaki err = -EINVAL; 856333fad53SYOSHIFUJI Hideaki goto exit_f; 857333fad53SYOSHIFUJI Hideaki } 858af31f412SEric W. Biederman if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 859333fad53SYOSHIFUJI Hideaki err = -EPERM; 860333fad53SYOSHIFUJI Hideaki goto exit_f; 861333fad53SYOSHIFUJI Hideaki } 862333fad53SYOSHIFUJI Hideaki if (cmsg->cmsg_type == IPV6_DSTOPTS) { 863333fad53SYOSHIFUJI Hideaki opt->opt_flen += len; 864333fad53SYOSHIFUJI Hideaki opt->dst1opt = hdr; 865333fad53SYOSHIFUJI Hideaki } else { 866333fad53SYOSHIFUJI Hideaki opt->opt_nflen += len; 867333fad53SYOSHIFUJI Hideaki opt->dst0opt = hdr; 868333fad53SYOSHIFUJI Hideaki } 869333fad53SYOSHIFUJI Hideaki break; 870333fad53SYOSHIFUJI Hideaki 871333fad53SYOSHIFUJI Hideaki case IPV6_2292RTHDR: 8721da177e4SLinus Torvalds case IPV6_RTHDR: 8731da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { 8741da177e4SLinus Torvalds err = -EINVAL; 8751da177e4SLinus Torvalds goto exit_f; 8761da177e4SLinus Torvalds } 8771da177e4SLinus Torvalds 8781da177e4SLinus Torvalds rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); 8791da177e4SLinus Torvalds 880280a9d34SMasahide NAKAMURA switch (rthdr->type) { 88107a93626SAmerigo Wang #if IS_ENABLED(CONFIG_IPV6_MIP6) 882280a9d34SMasahide NAKAMURA case IPV6_SRCRT_TYPE_2: 8836e093d9dSBrian Haley if (rthdr->hdrlen != 2 || 8846e093d9dSBrian Haley rthdr->segments_left != 1) { 8856e093d9dSBrian Haley err = -EINVAL; 8866e093d9dSBrian Haley goto exit_f; 8876e093d9dSBrian Haley } 888280a9d34SMasahide NAKAMURA break; 889bb4dbf9eSYOSHIFUJI Hideaki #endif 890280a9d34SMasahide NAKAMURA default: 8911da177e4SLinus Torvalds err = -EINVAL; 8921da177e4SLinus Torvalds goto exit_f; 8931da177e4SLinus Torvalds } 8941da177e4SLinus Torvalds 8951da177e4SLinus Torvalds len = ((rthdr->hdrlen + 1) << 3); 8961da177e4SLinus Torvalds 8971da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(len)) { 8981da177e4SLinus Torvalds err = -EINVAL; 8991da177e4SLinus Torvalds goto exit_f; 9001da177e4SLinus Torvalds } 9011da177e4SLinus Torvalds 9021da177e4SLinus Torvalds /* segments left must also match */ 9031da177e4SLinus Torvalds if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { 9041da177e4SLinus Torvalds err = -EINVAL; 9051da177e4SLinus Torvalds goto exit_f; 9061da177e4SLinus Torvalds } 9071da177e4SLinus Torvalds 9081da177e4SLinus Torvalds opt->opt_nflen += len; 9091da177e4SLinus Torvalds opt->srcrt = rthdr; 9101da177e4SLinus Torvalds 911333fad53SYOSHIFUJI Hideaki if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { 9121da177e4SLinus Torvalds int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); 9131da177e4SLinus Torvalds 9141da177e4SLinus Torvalds opt->opt_nflen += dsthdrlen; 9151da177e4SLinus Torvalds opt->dst0opt = opt->dst1opt; 9161da177e4SLinus Torvalds opt->dst1opt = NULL; 9171da177e4SLinus Torvalds opt->opt_flen -= dsthdrlen; 9181da177e4SLinus Torvalds } 9191da177e4SLinus Torvalds 9201da177e4SLinus Torvalds break; 9211da177e4SLinus Torvalds 922333fad53SYOSHIFUJI Hideaki case IPV6_2292HOPLIMIT: 9231da177e4SLinus Torvalds case IPV6_HOPLIMIT: 9241da177e4SLinus Torvalds if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 9251da177e4SLinus Torvalds err = -EINVAL; 9261da177e4SLinus Torvalds goto exit_f; 9271da177e4SLinus Torvalds } 9281da177e4SLinus Torvalds 9291da177e4SLinus Torvalds *hlimit = *(int *)CMSG_DATA(cmsg); 930e8766fc8SShan Wei if (*hlimit < -1 || *hlimit > 0xff) { 931e8766fc8SShan Wei err = -EINVAL; 932e8766fc8SShan Wei goto exit_f; 933e8766fc8SShan Wei } 934e8766fc8SShan Wei 9351da177e4SLinus Torvalds break; 9361da177e4SLinus Torvalds 93741a1f8eaSYOSHIFUJI Hideaki case IPV6_TCLASS: 93841a1f8eaSYOSHIFUJI Hideaki { 93941a1f8eaSYOSHIFUJI Hideaki int tc; 94041a1f8eaSYOSHIFUJI Hideaki 94141a1f8eaSYOSHIFUJI Hideaki err = -EINVAL; 942b5a4257cSEldad Zack if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 94341a1f8eaSYOSHIFUJI Hideaki goto exit_f; 94441a1f8eaSYOSHIFUJI Hideaki 94541a1f8eaSYOSHIFUJI Hideaki tc = *(int *)CMSG_DATA(cmsg); 946d0ee011fSRemi Denis-Courmont if (tc < -1 || tc > 0xff) 94741a1f8eaSYOSHIFUJI Hideaki goto exit_f; 94841a1f8eaSYOSHIFUJI Hideaki 94941a1f8eaSYOSHIFUJI Hideaki err = 0; 95041a1f8eaSYOSHIFUJI Hideaki *tclass = tc; 95141a1f8eaSYOSHIFUJI Hideaki 95241a1f8eaSYOSHIFUJI Hideaki break; 95341a1f8eaSYOSHIFUJI Hideaki } 95413b52cd4SBrian Haley 95513b52cd4SBrian Haley case IPV6_DONTFRAG: 95613b52cd4SBrian Haley { 95713b52cd4SBrian Haley int df; 95813b52cd4SBrian Haley 95913b52cd4SBrian Haley err = -EINVAL; 960b5a4257cSEldad Zack if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 96113b52cd4SBrian Haley goto exit_f; 96213b52cd4SBrian Haley 96313b52cd4SBrian Haley df = *(int *)CMSG_DATA(cmsg); 96413b52cd4SBrian Haley if (df < 0 || df > 1) 96513b52cd4SBrian Haley goto exit_f; 96613b52cd4SBrian Haley 96713b52cd4SBrian Haley err = 0; 96813b52cd4SBrian Haley *dontfrag = df; 96913b52cd4SBrian Haley 97013b52cd4SBrian Haley break; 97113b52cd4SBrian Haley } 9721da177e4SLinus Torvalds default: 973ba7a46f1SJoe Perches net_dbg_ratelimited("invalid cmsg type: %d\n", 97464ce2073SPatrick McHardy cmsg->cmsg_type); 9751da177e4SLinus Torvalds err = -EINVAL; 9764a36702eSMiao Xie goto exit_f; 9773ff50b79SStephen Hemminger } 9781da177e4SLinus Torvalds } 9791da177e4SLinus Torvalds 9801da177e4SLinus Torvalds exit_f: 9811da177e4SLinus Torvalds return err; 9821da177e4SLinus Torvalds } 98373df66f8STom Parkin EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl); 98417ef66afSLorenzo Colitti 98517ef66afSLorenzo Colitti void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp, 98617ef66afSLorenzo Colitti __u16 srcp, __u16 destp, int bucket) 98717ef66afSLorenzo Colitti { 98817ef66afSLorenzo Colitti const struct in6_addr *dest, *src; 98917ef66afSLorenzo Colitti 990efe4208fSEric Dumazet dest = &sp->sk_v6_daddr; 991efe4208fSEric Dumazet src = &sp->sk_v6_rcv_saddr; 99217ef66afSLorenzo Colitti seq_printf(seq, 99317ef66afSLorenzo Colitti "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 994d14c5ab6SFrancesco Fusco "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n", 99517ef66afSLorenzo Colitti bucket, 99617ef66afSLorenzo Colitti src->s6_addr32[0], src->s6_addr32[1], 99717ef66afSLorenzo Colitti src->s6_addr32[2], src->s6_addr32[3], srcp, 99817ef66afSLorenzo Colitti dest->s6_addr32[0], dest->s6_addr32[1], 99917ef66afSLorenzo Colitti dest->s6_addr32[2], dest->s6_addr32[3], destp, 100017ef66afSLorenzo Colitti sp->sk_state, 100117ef66afSLorenzo Colitti sk_wmem_alloc_get(sp), 100217ef66afSLorenzo Colitti sk_rmem_alloc_get(sp), 100317ef66afSLorenzo Colitti 0, 0L, 0, 100417ef66afSLorenzo Colitti from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), 100517ef66afSLorenzo Colitti 0, 100617ef66afSLorenzo Colitti sock_i_ino(sp), 100717ef66afSLorenzo Colitti atomic_read(&sp->sk_refcnt), sp, 100817ef66afSLorenzo Colitti atomic_read(&sp->sk_drops)); 100917ef66afSLorenzo Colitti } 1010