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 6703645a11SEric Dumazet static int __ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) 681da177e4SLinus Torvalds { 691da177e4SLinus Torvalds struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; 701da177e4SLinus Torvalds struct inet_sock *inet = inet_sk(sk); 711da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 7220c59de2SArnaud Ebalard struct in6_addr *daddr, *final_p, final; 731da177e4SLinus Torvalds struct dst_entry *dst; 744c9483b2SDavid S. Miller struct flowi6 fl6; 751da177e4SLinus Torvalds struct ip6_flowlabel *flowlabel = NULL; 7620c59de2SArnaud Ebalard struct ipv6_txoptions *opt; 771da177e4SLinus Torvalds int addr_type; 781da177e4SLinus Torvalds int err; 7980fbdb20SMartin KaFai Lau __be32 fl6_flowlabel = 0; 801da177e4SLinus Torvalds 811da177e4SLinus Torvalds if (usin->sin6_family == AF_INET) { 821da177e4SLinus Torvalds if (__ipv6_only_sock(sk)) 831da177e4SLinus Torvalds return -EAFNOSUPPORT; 8403645a11SEric Dumazet err = __ip4_datagram_connect(sk, uaddr, addr_len); 851da177e4SLinus Torvalds goto ipv4_connected; 861da177e4SLinus Torvalds } 871da177e4SLinus Torvalds 881da177e4SLinus Torvalds if (addr_len < SIN6_LEN_RFC2133) 891da177e4SLinus Torvalds return -EINVAL; 901da177e4SLinus Torvalds 911da177e4SLinus Torvalds if (usin->sin6_family != AF_INET6) 921da177e4SLinus Torvalds return -EAFNOSUPPORT; 931da177e4SLinus Torvalds 941da177e4SLinus Torvalds if (np->sndflow) { 9580fbdb20SMartin KaFai Lau fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK; 9680fbdb20SMartin KaFai Lau if (fl6_flowlabel & IPV6_FLOWLABEL_MASK) { 9780fbdb20SMartin KaFai Lau flowlabel = fl6_sock_lookup(sk, fl6_flowlabel); 9863159f29SIan Morris if (!flowlabel) 991da177e4SLinus Torvalds return -EINVAL; 1001da177e4SLinus Torvalds } 1011da177e4SLinus Torvalds } 1021da177e4SLinus Torvalds 1031da177e4SLinus Torvalds addr_type = ipv6_addr_type(&usin->sin6_addr); 1041da177e4SLinus Torvalds 1051da177e4SLinus Torvalds if (addr_type == IPV6_ADDR_ANY) { 1061da177e4SLinus Torvalds /* 1071da177e4SLinus Torvalds * connect to self 1081da177e4SLinus Torvalds */ 1091da177e4SLinus Torvalds usin->sin6_addr.s6_addr[15] = 0x01; 1101da177e4SLinus Torvalds } 1111da177e4SLinus Torvalds 1121da177e4SLinus Torvalds daddr = &usin->sin6_addr; 1131da177e4SLinus Torvalds 1141da177e4SLinus Torvalds if (addr_type == IPV6_ADDR_MAPPED) { 1151da177e4SLinus Torvalds struct sockaddr_in sin; 1161da177e4SLinus Torvalds 1171da177e4SLinus Torvalds if (__ipv6_only_sock(sk)) { 1181da177e4SLinus Torvalds err = -ENETUNREACH; 1191da177e4SLinus Torvalds goto out; 1201da177e4SLinus Torvalds } 1211da177e4SLinus Torvalds sin.sin_family = AF_INET; 1221da177e4SLinus Torvalds sin.sin_addr.s_addr = daddr->s6_addr32[3]; 1231da177e4SLinus Torvalds sin.sin_port = usin->sin6_port; 1241da177e4SLinus Torvalds 12503645a11SEric Dumazet err = __ip4_datagram_connect(sk, 1261da177e4SLinus Torvalds (struct sockaddr *) &sin, 1271da177e4SLinus Torvalds sizeof(sin)); 1281da177e4SLinus Torvalds 1291da177e4SLinus Torvalds ipv4_connected: 1301da177e4SLinus Torvalds if (err) 1311da177e4SLinus Torvalds goto out; 1321da177e4SLinus Torvalds 133efe4208fSEric Dumazet ipv6_addr_set_v4mapped(inet->inet_daddr, &sk->sk_v6_daddr); 1341da177e4SLinus Torvalds 135c15fea2dSMax Matveev if (ipv6_addr_any(&np->saddr) || 136c15fea2dSMax Matveev ipv6_mapped_addr_any(&np->saddr)) 137c720c7e8SEric Dumazet ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); 1381da177e4SLinus Torvalds 139efe4208fSEric Dumazet if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) || 140efe4208fSEric Dumazet ipv6_mapped_addr_any(&sk->sk_v6_rcv_saddr)) { 141c720c7e8SEric Dumazet ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, 142efe4208fSEric Dumazet &sk->sk_v6_rcv_saddr); 143719f8358SEric Dumazet if (sk->sk_prot->rehash) 144719f8358SEric Dumazet sk->sk_prot->rehash(sk); 145719f8358SEric Dumazet } 146b301e82cSBrian Haley 1471da177e4SLinus Torvalds goto out; 1481da177e4SLinus Torvalds } 1491da177e4SLinus Torvalds 150842df073SHannes Frederic Sowa if (__ipv6_addr_needs_scope_id(addr_type)) { 1511da177e4SLinus Torvalds if (addr_len >= sizeof(struct sockaddr_in6) && 1521da177e4SLinus Torvalds usin->sin6_scope_id) { 1531da177e4SLinus Torvalds if (sk->sk_bound_dev_if && 1541da177e4SLinus Torvalds sk->sk_bound_dev_if != usin->sin6_scope_id) { 1551da177e4SLinus Torvalds err = -EINVAL; 1561da177e4SLinus Torvalds goto out; 1571da177e4SLinus Torvalds } 1581da177e4SLinus Torvalds sk->sk_bound_dev_if = usin->sin6_scope_id; 1591da177e4SLinus Torvalds } 1601da177e4SLinus Torvalds 1611ac4f008SBrian Haley if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST)) 1621ac4f008SBrian Haley sk->sk_bound_dev_if = np->mcast_oif; 1631ac4f008SBrian Haley 1641da177e4SLinus Torvalds /* Connect to link-local address requires an interface */ 1651da177e4SLinus Torvalds if (!sk->sk_bound_dev_if) { 1661da177e4SLinus Torvalds err = -EINVAL; 1671da177e4SLinus Torvalds goto out; 1681da177e4SLinus Torvalds } 1691da177e4SLinus Torvalds } 1701da177e4SLinus Torvalds 171efe4208fSEric Dumazet sk->sk_v6_daddr = *daddr; 17280fbdb20SMartin KaFai Lau np->flow_label = fl6_flowlabel; 1731da177e4SLinus Torvalds 174c720c7e8SEric Dumazet inet->inet_dport = usin->sin6_port; 1751da177e4SLinus Torvalds 1761da177e4SLinus Torvalds /* 1771da177e4SLinus Torvalds * Check for a route to destination an obtain the 1781da177e4SLinus Torvalds * destination cache for it. 1791da177e4SLinus Torvalds */ 1801da177e4SLinus Torvalds 18180fbdb20SMartin KaFai Lau ip6_datagram_flow_key_init(&fl6, sk); 182beb8d13bSVenkat Yekkirala 18345f6fad8SEric Dumazet rcu_read_lock(); 18445f6fad8SEric Dumazet opt = flowlabel ? flowlabel->opt : rcu_dereference(np->opt); 1854c9483b2SDavid S. Miller final_p = fl6_update_dst(&fl6, opt, &final); 18645f6fad8SEric Dumazet rcu_read_unlock(); 1871da177e4SLinus Torvalds 1880e0d44abSSteffen Klassert dst = ip6_dst_lookup_flow(sk, &fl6, final_p); 18968d0c6d3SDavid S. Miller err = 0; 19068d0c6d3SDavid S. Miller if (IS_ERR(dst)) { 19168d0c6d3SDavid S. Miller err = PTR_ERR(dst); 1921da177e4SLinus Torvalds goto out; 19314e50e57SDavid S. Miller } 1941da177e4SLinus Torvalds 1951da177e4SLinus Torvalds /* source address lookup done in ip6_dst_lookup */ 1961da177e4SLinus Torvalds 1971da177e4SLinus Torvalds if (ipv6_addr_any(&np->saddr)) 1984e3fd7a0SAlexey Dobriyan np->saddr = fl6.saddr; 1991da177e4SLinus Torvalds 200efe4208fSEric Dumazet if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { 201efe4208fSEric Dumazet sk->sk_v6_rcv_saddr = fl6.saddr; 202c720c7e8SEric Dumazet inet->inet_rcv_saddr = LOOPBACK4_IPV6; 203719f8358SEric Dumazet if (sk->sk_prot->rehash) 204719f8358SEric Dumazet sk->sk_prot->rehash(sk); 2051da177e4SLinus Torvalds } 2061da177e4SLinus Torvalds 2071da177e4SLinus Torvalds ip6_dst_store(sk, dst, 208efe4208fSEric Dumazet ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ? 209efe4208fSEric Dumazet &sk->sk_v6_daddr : NULL, 2108e1ef0a9SYOSHIFUJI Hideaki #ifdef CONFIG_IPV6_SUBTREES 2114c9483b2SDavid S. Miller ipv6_addr_equal(&fl6.saddr, &np->saddr) ? 2128e1ef0a9SYOSHIFUJI Hideaki &np->saddr : 2138e1ef0a9SYOSHIFUJI Hideaki #endif 2148e1ef0a9SYOSHIFUJI Hideaki NULL); 2151da177e4SLinus Torvalds 2161da177e4SLinus Torvalds sk->sk_state = TCP_ESTABLISHED; 217877d1f62STom Herbert sk_set_txhash(sk); 2181da177e4SLinus Torvalds out: 2191da177e4SLinus Torvalds fl6_sock_release(flowlabel); 2201da177e4SLinus Torvalds return err; 2211da177e4SLinus Torvalds } 22203645a11SEric Dumazet 22303645a11SEric Dumazet int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) 22403645a11SEric Dumazet { 22503645a11SEric Dumazet int res; 22603645a11SEric Dumazet 22703645a11SEric Dumazet lock_sock(sk); 22803645a11SEric Dumazet res = __ip6_datagram_connect(sk, uaddr, addr_len); 22903645a11SEric Dumazet release_sock(sk); 23003645a11SEric Dumazet return res; 23103645a11SEric Dumazet } 232a495f836SChris Elston EXPORT_SYMBOL_GPL(ip6_datagram_connect); 2331da177e4SLinus Torvalds 23482b276cdSHannes Frederic Sowa int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr, 23582b276cdSHannes Frederic Sowa int addr_len) 23682b276cdSHannes Frederic Sowa { 23782b276cdSHannes Frederic Sowa DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr); 23882b276cdSHannes Frederic Sowa if (sin6->sin6_family != AF_INET6) 23982b276cdSHannes Frederic Sowa return -EAFNOSUPPORT; 24082b276cdSHannes Frederic Sowa return ip6_datagram_connect(sk, uaddr, addr_len); 24182b276cdSHannes Frederic Sowa } 24282b276cdSHannes Frederic Sowa EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only); 24382b276cdSHannes Frederic Sowa 2441da177e4SLinus Torvalds void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 245e69a4adcSAl Viro __be16 port, u32 info, u8 *payload) 2461da177e4SLinus Torvalds { 2471da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 248cc70ab26SArnaldo Carvalho de Melo struct icmp6hdr *icmph = icmp6_hdr(skb); 2491da177e4SLinus Torvalds struct sock_exterr_skb *serr; 2501da177e4SLinus Torvalds 2511da177e4SLinus Torvalds if (!np->recverr) 2521da177e4SLinus Torvalds return; 2531da177e4SLinus Torvalds 2541da177e4SLinus Torvalds skb = skb_clone(skb, GFP_ATOMIC); 2551da177e4SLinus Torvalds if (!skb) 2561da177e4SLinus Torvalds return; 2571da177e4SLinus Torvalds 258d40a4de0SBrian Haley skb->protocol = htons(ETH_P_IPV6); 259d40a4de0SBrian Haley 2601da177e4SLinus Torvalds serr = SKB_EXT_ERR(skb); 2611da177e4SLinus Torvalds serr->ee.ee_errno = err; 2621da177e4SLinus Torvalds serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6; 2631da177e4SLinus Torvalds serr->ee.ee_type = icmph->icmp6_type; 2641da177e4SLinus Torvalds serr->ee.ee_code = icmph->icmp6_code; 2651da177e4SLinus Torvalds serr->ee.ee_pad = 0; 2661da177e4SLinus Torvalds serr->ee.ee_info = info; 2671da177e4SLinus Torvalds serr->ee.ee_data = 0; 268d56f90a7SArnaldo Carvalho de Melo serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) - 269d56f90a7SArnaldo Carvalho de Melo skb_network_header(skb); 2701da177e4SLinus Torvalds serr->port = port; 2711da177e4SLinus Torvalds 2721da177e4SLinus Torvalds __skb_pull(skb, payload - skb->data); 273bd82393cSArnaldo Carvalho de Melo skb_reset_transport_header(skb); 2741da177e4SLinus Torvalds 2751da177e4SLinus Torvalds if (sock_queue_err_skb(sk, skb)) 2761da177e4SLinus Torvalds kfree_skb(skb); 2771da177e4SLinus Torvalds } 2781da177e4SLinus Torvalds 2794c9483b2SDavid S. Miller void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info) 2801da177e4SLinus Torvalds { 2811c1e9d2bSEric Dumazet const struct ipv6_pinfo *np = inet6_sk(sk); 2821da177e4SLinus Torvalds struct sock_exterr_skb *serr; 2831da177e4SLinus Torvalds struct ipv6hdr *iph; 2841da177e4SLinus Torvalds struct sk_buff *skb; 2851da177e4SLinus Torvalds 2861da177e4SLinus Torvalds if (!np->recverr) 2871da177e4SLinus Torvalds return; 2881da177e4SLinus Torvalds 2891da177e4SLinus Torvalds skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 2901da177e4SLinus Torvalds if (!skb) 2911da177e4SLinus Torvalds return; 2921da177e4SLinus Torvalds 293d40a4de0SBrian Haley skb->protocol = htons(ETH_P_IPV6); 294d40a4de0SBrian Haley 2951ced98e8SArnaldo Carvalho de Melo skb_put(skb, sizeof(struct ipv6hdr)); 2961ced98e8SArnaldo Carvalho de Melo skb_reset_network_header(skb); 2970660e03fSArnaldo Carvalho de Melo iph = ipv6_hdr(skb); 2984e3fd7a0SAlexey Dobriyan iph->daddr = fl6->daddr; 2991da177e4SLinus Torvalds 3001da177e4SLinus Torvalds serr = SKB_EXT_ERR(skb); 3011da177e4SLinus Torvalds serr->ee.ee_errno = err; 3021da177e4SLinus Torvalds serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 3031da177e4SLinus Torvalds serr->ee.ee_type = 0; 3041da177e4SLinus Torvalds serr->ee.ee_code = 0; 3051da177e4SLinus Torvalds serr->ee.ee_pad = 0; 3061da177e4SLinus Torvalds serr->ee.ee_info = info; 3071da177e4SLinus Torvalds serr->ee.ee_data = 0; 308d56f90a7SArnaldo Carvalho de Melo serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); 3091958b856SDavid S. Miller serr->port = fl6->fl6_dport; 3101da177e4SLinus Torvalds 31127a884dcSArnaldo Carvalho de Melo __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 312bd82393cSArnaldo Carvalho de Melo skb_reset_transport_header(skb); 3131da177e4SLinus Torvalds 3141da177e4SLinus Torvalds if (sock_queue_err_skb(sk, skb)) 3151da177e4SLinus Torvalds kfree_skb(skb); 3161da177e4SLinus Torvalds } 3171da177e4SLinus Torvalds 3184c9483b2SDavid S. Miller void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu) 3194b340ae2SBrian Haley { 3204b340ae2SBrian Haley struct ipv6_pinfo *np = inet6_sk(sk); 3214b340ae2SBrian Haley struct ipv6hdr *iph; 3224b340ae2SBrian Haley struct sk_buff *skb; 3234b340ae2SBrian Haley struct ip6_mtuinfo *mtu_info; 3244b340ae2SBrian Haley 3254b340ae2SBrian Haley if (!np->rxopt.bits.rxpmtu) 3264b340ae2SBrian Haley return; 3274b340ae2SBrian Haley 3284b340ae2SBrian Haley skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 3294b340ae2SBrian Haley if (!skb) 3304b340ae2SBrian Haley return; 3314b340ae2SBrian Haley 3324b340ae2SBrian Haley skb_put(skb, sizeof(struct ipv6hdr)); 3334b340ae2SBrian Haley skb_reset_network_header(skb); 3344b340ae2SBrian Haley iph = ipv6_hdr(skb); 3354e3fd7a0SAlexey Dobriyan iph->daddr = fl6->daddr; 3364b340ae2SBrian Haley 3374b340ae2SBrian Haley mtu_info = IP6CBMTU(skb); 3384b340ae2SBrian Haley 3394b340ae2SBrian Haley mtu_info->ip6m_mtu = mtu; 3404b340ae2SBrian Haley mtu_info->ip6m_addr.sin6_family = AF_INET6; 3414b340ae2SBrian Haley mtu_info->ip6m_addr.sin6_port = 0; 3424b340ae2SBrian Haley mtu_info->ip6m_addr.sin6_flowinfo = 0; 3434c9483b2SDavid S. Miller mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif; 3444e3fd7a0SAlexey Dobriyan mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr; 3454b340ae2SBrian Haley 3464b340ae2SBrian Haley __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 3474b340ae2SBrian Haley skb_reset_transport_header(skb); 3484b340ae2SBrian Haley 3494b340ae2SBrian Haley skb = xchg(&np->rxpmtu, skb); 3504b340ae2SBrian Haley kfree_skb(skb); 3514b340ae2SBrian Haley } 3524b340ae2SBrian Haley 35334b99df4SJulian Anastasov /* For some errors we have valid addr_offset even with zero payload and 35434b99df4SJulian Anastasov * zero port. Also, addr_offset should be supported if port is set. 35534b99df4SJulian Anastasov */ 35634b99df4SJulian Anastasov static inline bool ipv6_datagram_support_addr(struct sock_exterr_skb *serr) 35734b99df4SJulian Anastasov { 35834b99df4SJulian Anastasov return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6 || 35934b99df4SJulian Anastasov serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || 36034b99df4SJulian Anastasov serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port; 36134b99df4SJulian Anastasov } 36234b99df4SJulian Anastasov 363c247f053SWillem de Bruijn /* IPv6 supports cmsg on all origins aside from SO_EE_ORIGIN_LOCAL. 364c247f053SWillem de Bruijn * 365c247f053SWillem de Bruijn * At one point, excluding local errors was a quick test to identify icmp/icmp6 366c247f053SWillem de Bruijn * errors. This is no longer true, but the test remained, so the v6 stack, 367c247f053SWillem de Bruijn * unlike v4, also honors cmsg requests on all wifi and timestamp errors. 368c247f053SWillem de Bruijn * 369c247f053SWillem de Bruijn * Timestamp code paths do not initialize the fields expected by cmsg: 370c247f053SWillem de Bruijn * the PKTINFO fields in skb->cb[]. Fill those in here. 371c247f053SWillem de Bruijn */ 372c247f053SWillem de Bruijn static bool ip6_datagram_support_cmsg(struct sk_buff *skb, 373c247f053SWillem de Bruijn struct sock_exterr_skb *serr) 374829ae9d6SWillem de Bruijn { 375c247f053SWillem de Bruijn if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || 376c247f053SWillem de Bruijn serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) 377c247f053SWillem de Bruijn return true; 378c247f053SWillem de Bruijn 379c247f053SWillem de Bruijn if (serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL) 380c247f053SWillem de Bruijn return false; 381c247f053SWillem de Bruijn 382c247f053SWillem de Bruijn if (!skb->dev) 383c247f053SWillem de Bruijn return false; 384829ae9d6SWillem de Bruijn 385829ae9d6SWillem de Bruijn if (skb->protocol == htons(ETH_P_IPV6)) 386c247f053SWillem de Bruijn IP6CB(skb)->iif = skb->dev->ifindex; 387829ae9d6SWillem de Bruijn else 388c247f053SWillem de Bruijn PKTINFO_SKB_CB(skb)->ipi_ifindex = skb->dev->ifindex; 389c247f053SWillem de Bruijn 390c247f053SWillem de Bruijn return true; 391829ae9d6SWillem de Bruijn } 392829ae9d6SWillem de Bruijn 3931da177e4SLinus Torvalds /* 3941da177e4SLinus Torvalds * Handle MSG_ERRQUEUE 3951da177e4SLinus Torvalds */ 39685fbaa75SHannes Frederic Sowa int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 3971da177e4SLinus Torvalds { 3981da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 3991da177e4SLinus Torvalds struct sock_exterr_skb *serr; 400364a9e93SWillem de Bruijn struct sk_buff *skb; 401342dfc30SSteffen Hurrle DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); 4021da177e4SLinus Torvalds struct { 4031da177e4SLinus Torvalds struct sock_extended_err ee; 4041da177e4SLinus Torvalds struct sockaddr_in6 offender; 4051da177e4SLinus Torvalds } errhdr; 4061da177e4SLinus Torvalds int err; 4071da177e4SLinus Torvalds int copied; 4081da177e4SLinus Torvalds 4091da177e4SLinus Torvalds err = -EAGAIN; 410364a9e93SWillem de Bruijn skb = sock_dequeue_err_skb(sk); 41163159f29SIan Morris if (!skb) 4121da177e4SLinus Torvalds goto out; 4131da177e4SLinus Torvalds 4141da177e4SLinus Torvalds copied = skb->len; 4151da177e4SLinus Torvalds if (copied > len) { 4161da177e4SLinus Torvalds msg->msg_flags |= MSG_TRUNC; 4171da177e4SLinus Torvalds copied = len; 4181da177e4SLinus Torvalds } 41951f3d02bSDavid S. Miller err = skb_copy_datagram_msg(skb, 0, msg, copied); 4201da177e4SLinus Torvalds if (err) 4211da177e4SLinus Torvalds goto out_free_skb; 4221da177e4SLinus Torvalds 4231da177e4SLinus Torvalds sock_recv_timestamp(msg, sk, skb); 4241da177e4SLinus Torvalds 4251da177e4SLinus Torvalds serr = SKB_EXT_ERR(skb); 4261da177e4SLinus Torvalds 42734b99df4SJulian Anastasov if (sin && ipv6_datagram_support_addr(serr)) { 428d56f90a7SArnaldo Carvalho de Melo const unsigned char *nh = skb_network_header(skb); 4291da177e4SLinus Torvalds sin->sin6_family = AF_INET6; 4301da177e4SLinus Torvalds sin->sin6_flowinfo = 0; 4311da177e4SLinus Torvalds sin->sin6_port = serr->port; 432d40a4de0SBrian Haley if (skb->protocol == htons(ETH_P_IPV6)) { 4336c40d100SYOSHIFUJI Hideaki / 吉藤英明 const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset), 4346c40d100SYOSHIFUJI Hideaki / 吉藤英明 struct ipv6hdr, daddr); 4356c40d100SYOSHIFUJI Hideaki / 吉藤英明 sin->sin6_addr = ip6h->daddr; 4361da177e4SLinus Torvalds if (np->sndflow) 4376502ca52SYOSHIFUJI Hideaki / 吉藤英明 sin->sin6_flowinfo = ip6_flowinfo(ip6h); 438842df073SHannes Frederic Sowa sin->sin6_scope_id = 439842df073SHannes Frederic Sowa ipv6_iface_scope_id(&sin->sin6_addr, 440842df073SHannes Frederic Sowa IP6CB(skb)->iif); 4411da177e4SLinus Torvalds } else { 442b301e82cSBrian Haley ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset), 443b301e82cSBrian Haley &sin->sin6_addr); 444842df073SHannes Frederic Sowa sin->sin6_scope_id = 0; 4451da177e4SLinus Torvalds } 44685fbaa75SHannes Frederic Sowa *addr_len = sizeof(*sin); 4471da177e4SLinus Torvalds } 4481da177e4SLinus Torvalds 4491da177e4SLinus Torvalds memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 4501da177e4SLinus Torvalds sin = &errhdr.offender; 451f812116bSWillem de Bruijn memset(sin, 0, sizeof(*sin)); 452c247f053SWillem de Bruijn 453c247f053SWillem de Bruijn if (ip6_datagram_support_cmsg(skb, serr)) { 4541da177e4SLinus Torvalds sin->sin6_family = AF_INET6; 455c247f053SWillem de Bruijn if (np->rxopt.all) 4564b261c75SHannes Frederic Sowa ip6_datagram_recv_common_ctl(sk, msg, skb); 457d40a4de0SBrian Haley if (skb->protocol == htons(ETH_P_IPV6)) { 4584e3fd7a0SAlexey Dobriyan sin->sin6_addr = ipv6_hdr(skb)->saddr; 4591da177e4SLinus Torvalds if (np->rxopt.all) 4604b261c75SHannes Frederic Sowa ip6_datagram_recv_specific_ctl(sk, msg, skb); 461842df073SHannes Frederic Sowa sin->sin6_scope_id = 462842df073SHannes Frederic Sowa ipv6_iface_scope_id(&sin->sin6_addr, 463842df073SHannes Frederic Sowa IP6CB(skb)->iif); 4641da177e4SLinus Torvalds } else { 465b301e82cSBrian Haley ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 466b301e82cSBrian Haley &sin->sin6_addr); 467f812116bSWillem de Bruijn if (inet_sk(sk)->cmsg_flags) 4681da177e4SLinus Torvalds ip_cmsg_recv(msg, skb); 4691da177e4SLinus Torvalds } 4701da177e4SLinus Torvalds } 4711da177e4SLinus Torvalds 4721da177e4SLinus Torvalds put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr); 4731da177e4SLinus Torvalds 4741da177e4SLinus Torvalds /* Now we could try to dump offended packet options */ 4751da177e4SLinus Torvalds 4761da177e4SLinus Torvalds msg->msg_flags |= MSG_ERRQUEUE; 4771da177e4SLinus Torvalds err = copied; 4781da177e4SLinus Torvalds 4791da177e4SLinus Torvalds out_free_skb: 4801da177e4SLinus Torvalds kfree_skb(skb); 4811da177e4SLinus Torvalds out: 4821da177e4SLinus Torvalds return err; 4831da177e4SLinus Torvalds } 484a495f836SChris Elston EXPORT_SYMBOL_GPL(ipv6_recv_error); 4851da177e4SLinus Torvalds 4864b340ae2SBrian Haley /* 4874b340ae2SBrian Haley * Handle IPV6_RECVPATHMTU 4884b340ae2SBrian Haley */ 48985fbaa75SHannes Frederic Sowa int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len, 49085fbaa75SHannes Frederic Sowa int *addr_len) 4914b340ae2SBrian Haley { 4924b340ae2SBrian Haley struct ipv6_pinfo *np = inet6_sk(sk); 4934b340ae2SBrian Haley struct sk_buff *skb; 4944b340ae2SBrian Haley struct ip6_mtuinfo mtu_info; 495342dfc30SSteffen Hurrle DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); 4964b340ae2SBrian Haley int err; 4974b340ae2SBrian Haley int copied; 4984b340ae2SBrian Haley 4994b340ae2SBrian Haley err = -EAGAIN; 5004b340ae2SBrian Haley skb = xchg(&np->rxpmtu, NULL); 50163159f29SIan Morris if (!skb) 5024b340ae2SBrian Haley goto out; 5034b340ae2SBrian Haley 5044b340ae2SBrian Haley copied = skb->len; 5054b340ae2SBrian Haley if (copied > len) { 5064b340ae2SBrian Haley msg->msg_flags |= MSG_TRUNC; 5074b340ae2SBrian Haley copied = len; 5084b340ae2SBrian Haley } 50951f3d02bSDavid S. Miller err = skb_copy_datagram_msg(skb, 0, msg, copied); 5104b340ae2SBrian Haley if (err) 5114b340ae2SBrian Haley goto out_free_skb; 5124b340ae2SBrian Haley 5134b340ae2SBrian Haley sock_recv_timestamp(msg, sk, skb); 5144b340ae2SBrian Haley 5154b340ae2SBrian Haley memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info)); 5164b340ae2SBrian Haley 5174b340ae2SBrian Haley if (sin) { 5184b340ae2SBrian Haley sin->sin6_family = AF_INET6; 5194b340ae2SBrian Haley sin->sin6_flowinfo = 0; 5204b340ae2SBrian Haley sin->sin6_port = 0; 5214b340ae2SBrian Haley sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id; 5224e3fd7a0SAlexey Dobriyan sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr; 52385fbaa75SHannes Frederic Sowa *addr_len = sizeof(*sin); 5244b340ae2SBrian Haley } 5254b340ae2SBrian Haley 5264b340ae2SBrian Haley put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info); 5274b340ae2SBrian Haley 5284b340ae2SBrian Haley err = copied; 5294b340ae2SBrian Haley 5304b340ae2SBrian Haley out_free_skb: 5314b340ae2SBrian Haley kfree_skb(skb); 5324b340ae2SBrian Haley out: 5334b340ae2SBrian Haley return err; 5344b340ae2SBrian Haley } 5351da177e4SLinus Torvalds 5361da177e4SLinus Torvalds 5374b261c75SHannes Frederic Sowa void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg, 5384b261c75SHannes Frederic Sowa struct sk_buff *skb) 5394b261c75SHannes Frederic Sowa { 5404b261c75SHannes Frederic Sowa struct ipv6_pinfo *np = inet6_sk(sk); 5414b261c75SHannes Frederic Sowa bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6); 5424b261c75SHannes Frederic Sowa 5434b261c75SHannes Frederic Sowa if (np->rxopt.bits.rxinfo) { 5444b261c75SHannes Frederic Sowa struct in6_pktinfo src_info; 5454b261c75SHannes Frederic Sowa 5464b261c75SHannes Frederic Sowa if (is_ipv6) { 5474b261c75SHannes Frederic Sowa src_info.ipi6_ifindex = IP6CB(skb)->iif; 5484b261c75SHannes Frederic Sowa src_info.ipi6_addr = ipv6_hdr(skb)->daddr; 5494b261c75SHannes Frederic Sowa } else { 5504b261c75SHannes Frederic Sowa src_info.ipi6_ifindex = 5514b261c75SHannes Frederic Sowa PKTINFO_SKB_CB(skb)->ipi_ifindex; 5524b261c75SHannes Frederic Sowa ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr, 5534b261c75SHannes Frederic Sowa &src_info.ipi6_addr); 5544b261c75SHannes Frederic Sowa } 555829ae9d6SWillem de Bruijn 556829ae9d6SWillem de Bruijn if (src_info.ipi6_ifindex >= 0) 557829ae9d6SWillem de Bruijn put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, 558829ae9d6SWillem de Bruijn sizeof(src_info), &src_info); 5594b261c75SHannes Frederic Sowa } 5604b261c75SHannes Frederic Sowa } 5614b261c75SHannes Frederic Sowa 5624b261c75SHannes Frederic Sowa void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg, 56373df66f8STom Parkin struct sk_buff *skb) 5641da177e4SLinus Torvalds { 5651da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 5661da177e4SLinus Torvalds struct inet6_skb_parm *opt = IP6CB(skb); 567d56f90a7SArnaldo Carvalho de Melo unsigned char *nh = skb_network_header(skb); 5681da177e4SLinus Torvalds 5691da177e4SLinus Torvalds if (np->rxopt.bits.rxhlim) { 5700660e03fSArnaldo Carvalho de Melo int hlim = ipv6_hdr(skb)->hop_limit; 5711da177e4SLinus Torvalds put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 5721da177e4SLinus Torvalds } 5731da177e4SLinus Torvalds 57441a1f8eaSYOSHIFUJI Hideaki if (np->rxopt.bits.rxtclass) { 575e7219858SYOSHIFUJI Hideaki / 吉藤英明 int tclass = ipv6_get_dsfield(ipv6_hdr(skb)); 57641a1f8eaSYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 57741a1f8eaSYOSHIFUJI Hideaki } 57841a1f8eaSYOSHIFUJI Hideaki 5796502ca52SYOSHIFUJI Hideaki / 吉藤英明 if (np->rxopt.bits.rxflow) { 5806502ca52SYOSHIFUJI Hideaki / 吉藤英明 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh); 5816502ca52SYOSHIFUJI Hideaki / 吉藤英明 if (flowinfo) 5821da177e4SLinus Torvalds put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 5831da177e4SLinus Torvalds } 584333fad53SYOSHIFUJI Hideaki 585333fad53SYOSHIFUJI Hideaki /* HbH is allowed only once */ 5868b58a398SFlorian Westphal if (np->rxopt.bits.hopopts && (opt->flags & IP6SKB_HOPBYHOP)) { 5878b58a398SFlorian Westphal u8 *ptr = nh + sizeof(struct ipv6hdr); 5881da177e4SLinus Torvalds put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); 5891da177e4SLinus Torvalds } 590333fad53SYOSHIFUJI Hideaki 591333fad53SYOSHIFUJI Hideaki if (opt->lastopt && 592333fad53SYOSHIFUJI Hideaki (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { 593333fad53SYOSHIFUJI Hideaki /* 594333fad53SYOSHIFUJI Hideaki * Silly enough, but we need to reparse in order to 595333fad53SYOSHIFUJI Hideaki * report extension headers (except for HbH) 596333fad53SYOSHIFUJI Hideaki * in order. 597333fad53SYOSHIFUJI Hideaki * 598333fad53SYOSHIFUJI Hideaki * Also note that IPV6_RECVRTHDRDSTOPTS is NOT 599333fad53SYOSHIFUJI Hideaki * (and WILL NOT be) defined because 600333fad53SYOSHIFUJI Hideaki * IPV6_RECVDSTOPTS is more generic. --yoshfuji 601333fad53SYOSHIFUJI Hideaki */ 602333fad53SYOSHIFUJI Hideaki unsigned int off = sizeof(struct ipv6hdr); 6030660e03fSArnaldo Carvalho de Melo u8 nexthdr = ipv6_hdr(skb)->nexthdr; 604333fad53SYOSHIFUJI Hideaki 605333fad53SYOSHIFUJI Hideaki while (off <= opt->lastopt) { 60695c96174SEric Dumazet unsigned int len; 607d56f90a7SArnaldo Carvalho de Melo u8 *ptr = nh + off; 608333fad53SYOSHIFUJI Hideaki 609333fad53SYOSHIFUJI Hideaki switch (nexthdr) { 610333fad53SYOSHIFUJI Hideaki case IPPROTO_DSTOPTS: 611333fad53SYOSHIFUJI Hideaki nexthdr = ptr[0]; 612333fad53SYOSHIFUJI Hideaki len = (ptr[1] + 1) << 3; 613333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.dstopts) 614333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr); 615333fad53SYOSHIFUJI Hideaki break; 616333fad53SYOSHIFUJI Hideaki case IPPROTO_ROUTING: 617333fad53SYOSHIFUJI Hideaki nexthdr = ptr[0]; 618333fad53SYOSHIFUJI Hideaki len = (ptr[1] + 1) << 3; 619333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.srcrt) 620333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr); 621333fad53SYOSHIFUJI Hideaki break; 622333fad53SYOSHIFUJI Hideaki case IPPROTO_AH: 623333fad53SYOSHIFUJI Hideaki nexthdr = ptr[0]; 624a3059893SVille Nuorvala len = (ptr[1] + 2) << 2; 625333fad53SYOSHIFUJI Hideaki break; 626333fad53SYOSHIFUJI Hideaki default: 627333fad53SYOSHIFUJI Hideaki nexthdr = ptr[0]; 628333fad53SYOSHIFUJI Hideaki len = (ptr[1] + 1) << 3; 629333fad53SYOSHIFUJI Hideaki break; 630333fad53SYOSHIFUJI Hideaki } 631333fad53SYOSHIFUJI Hideaki 632333fad53SYOSHIFUJI Hideaki off += len; 633333fad53SYOSHIFUJI Hideaki } 634333fad53SYOSHIFUJI Hideaki } 635333fad53SYOSHIFUJI Hideaki 636333fad53SYOSHIFUJI Hideaki /* socket options in old style */ 637333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.rxoinfo) { 638333fad53SYOSHIFUJI Hideaki struct in6_pktinfo src_info; 639333fad53SYOSHIFUJI Hideaki 640333fad53SYOSHIFUJI Hideaki src_info.ipi6_ifindex = opt->iif; 6414e3fd7a0SAlexey Dobriyan src_info.ipi6_addr = ipv6_hdr(skb)->daddr; 642333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 643333fad53SYOSHIFUJI Hideaki } 644333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.rxohlim) { 6450660e03fSArnaldo Carvalho de Melo int hlim = ipv6_hdr(skb)->hop_limit; 646333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 647333fad53SYOSHIFUJI Hideaki } 6488b58a398SFlorian Westphal if (np->rxopt.bits.ohopopts && (opt->flags & IP6SKB_HOPBYHOP)) { 6498b58a398SFlorian Westphal u8 *ptr = nh + sizeof(struct ipv6hdr); 650333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr); 651333fad53SYOSHIFUJI Hideaki } 652333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.odstopts && opt->dst0) { 653d56f90a7SArnaldo Carvalho de Melo u8 *ptr = nh + opt->dst0; 654333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 6551da177e4SLinus Torvalds } 656333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.osrcrt && opt->srcrt) { 657d56f90a7SArnaldo Carvalho de Melo struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt); 658333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr); 6591da177e4SLinus Torvalds } 660333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.odstopts && opt->dst1) { 661d56f90a7SArnaldo Carvalho de Melo u8 *ptr = nh + opt->dst1; 662333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 6631da177e4SLinus Torvalds } 6646c468622SBalazs Scheidler if (np->rxopt.bits.rxorigdstaddr) { 6656c468622SBalazs Scheidler struct sockaddr_in6 sin6; 666747465efSEric Dumazet __be16 *ports = (__be16 *) skb_transport_header(skb); 6676c468622SBalazs Scheidler 6686c468622SBalazs Scheidler if (skb_transport_offset(skb) + 4 <= skb->len) { 6696c468622SBalazs Scheidler /* All current transport protocols have the port numbers in the 6706c468622SBalazs Scheidler * first four bytes of the transport header and this function is 6716c468622SBalazs Scheidler * written with this assumption in mind. 6726c468622SBalazs Scheidler */ 6736c468622SBalazs Scheidler 6746c468622SBalazs Scheidler sin6.sin6_family = AF_INET6; 6754e3fd7a0SAlexey Dobriyan sin6.sin6_addr = ipv6_hdr(skb)->daddr; 6766c468622SBalazs Scheidler sin6.sin6_port = ports[1]; 6776c468622SBalazs Scheidler sin6.sin6_flowinfo = 0; 6783868b7aaSHannes Frederic Sowa sin6.sin6_scope_id = 6793868b7aaSHannes Frederic Sowa ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr, 6803868b7aaSHannes Frederic Sowa opt->iif); 6816c468622SBalazs Scheidler 6826c468622SBalazs Scheidler put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6); 6836c468622SBalazs Scheidler } 6846c468622SBalazs Scheidler } 6854b261c75SHannes Frederic Sowa } 6864b261c75SHannes Frederic Sowa 6874b261c75SHannes Frederic Sowa void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg, 6884b261c75SHannes Frederic Sowa struct sk_buff *skb) 6894b261c75SHannes Frederic Sowa { 6904b261c75SHannes Frederic Sowa ip6_datagram_recv_common_ctl(sk, msg, skb); 6914b261c75SHannes Frederic Sowa ip6_datagram_recv_specific_ctl(sk, msg, skb); 6921da177e4SLinus Torvalds } 6938e72d37eSTom Parkin EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl); 6941da177e4SLinus Torvalds 69573df66f8STom Parkin int ip6_datagram_send_ctl(struct net *net, struct sock *sk, 6964c9483b2SDavid S. Miller struct msghdr *msg, struct flowi6 *fl6, 6971da177e4SLinus Torvalds struct ipv6_txoptions *opt, 69813b52cd4SBrian Haley int *hlimit, int *tclass, int *dontfrag) 6991da177e4SLinus Torvalds { 7001da177e4SLinus Torvalds struct in6_pktinfo *src_info; 7011da177e4SLinus Torvalds struct cmsghdr *cmsg; 7021da177e4SLinus Torvalds struct ipv6_rt_hdr *rthdr; 7031da177e4SLinus Torvalds struct ipv6_opt_hdr *hdr; 7041da177e4SLinus Torvalds int len; 7051da177e4SLinus Torvalds int err = 0; 7061da177e4SLinus Torvalds 707f95b414eSGu Zheng for_each_cmsghdr(cmsg, msg) { 7081da177e4SLinus Torvalds int addr_type; 7091da177e4SLinus Torvalds 7101da177e4SLinus Torvalds if (!CMSG_OK(msg, cmsg)) { 7111da177e4SLinus Torvalds err = -EINVAL; 7121da177e4SLinus Torvalds goto exit_f; 7131da177e4SLinus Torvalds } 7141da177e4SLinus Torvalds 7151da177e4SLinus Torvalds if (cmsg->cmsg_level != SOL_IPV6) 7161da177e4SLinus Torvalds continue; 7171da177e4SLinus Torvalds 7181da177e4SLinus Torvalds switch (cmsg->cmsg_type) { 7191da177e4SLinus Torvalds case IPV6_PKTINFO: 720333fad53SYOSHIFUJI Hideaki case IPV6_2292PKTINFO: 721187e3838SYOSHIFUJI Hideaki { 722187e3838SYOSHIFUJI Hideaki struct net_device *dev = NULL; 723187e3838SYOSHIFUJI Hideaki 7241da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { 7251da177e4SLinus Torvalds err = -EINVAL; 7261da177e4SLinus Torvalds goto exit_f; 7271da177e4SLinus Torvalds } 7281da177e4SLinus Torvalds 7291da177e4SLinus Torvalds src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); 7301da177e4SLinus Torvalds 7311da177e4SLinus Torvalds if (src_info->ipi6_ifindex) { 7324c9483b2SDavid S. Miller if (fl6->flowi6_oif && 7334c9483b2SDavid S. Miller src_info->ipi6_ifindex != fl6->flowi6_oif) 7341da177e4SLinus Torvalds return -EINVAL; 7354c9483b2SDavid S. Miller fl6->flowi6_oif = src_info->ipi6_ifindex; 7361da177e4SLinus Torvalds } 7371da177e4SLinus Torvalds 738187e3838SYOSHIFUJI Hideaki addr_type = __ipv6_addr_type(&src_info->ipi6_addr); 7391da177e4SLinus Torvalds 740536b2e92SEric Dumazet rcu_read_lock(); 7414c9483b2SDavid S. Miller if (fl6->flowi6_oif) { 7424c9483b2SDavid S. Miller dev = dev_get_by_index_rcu(net, fl6->flowi6_oif); 743536b2e92SEric Dumazet if (!dev) { 744536b2e92SEric Dumazet rcu_read_unlock(); 7451da177e4SLinus Torvalds return -ENODEV; 746536b2e92SEric Dumazet } 747536b2e92SEric Dumazet } else if (addr_type & IPV6_ADDR_LINKLOCAL) { 748536b2e92SEric Dumazet rcu_read_unlock(); 749187e3838SYOSHIFUJI Hideaki return -EINVAL; 750536b2e92SEric Dumazet } 751187e3838SYOSHIFUJI Hideaki 752187e3838SYOSHIFUJI Hideaki if (addr_type != IPV6_ADDR_ANY) { 753187e3838SYOSHIFUJI Hideaki int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL; 7542563fa59SMaciej Żenczykowski if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) && 755ec0506dbSMaciej Żenczykowski !ipv6_chk_addr(net, &src_info->ipi6_addr, 7567c90cc2dSFX Le Bail strict ? dev : NULL, 0) && 7577c90cc2dSFX Le Bail !ipv6_chk_acast_addr_src(net, dev, 7587c90cc2dSFX Le Bail &src_info->ipi6_addr)) 7591da177e4SLinus Torvalds err = -EINVAL; 760187e3838SYOSHIFUJI Hideaki else 7614e3fd7a0SAlexey Dobriyan fl6->saddr = src_info->ipi6_addr; 7621da177e4SLinus Torvalds } 763187e3838SYOSHIFUJI Hideaki 764536b2e92SEric Dumazet rcu_read_unlock(); 7651da177e4SLinus Torvalds 766187e3838SYOSHIFUJI Hideaki if (err) 767187e3838SYOSHIFUJI Hideaki goto exit_f; 768187e3838SYOSHIFUJI Hideaki 7691da177e4SLinus Torvalds break; 770187e3838SYOSHIFUJI Hideaki } 7711da177e4SLinus Torvalds 7721da177e4SLinus Torvalds case IPV6_FLOWINFO: 7731da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(4)) { 7741da177e4SLinus Torvalds err = -EINVAL; 7751da177e4SLinus Torvalds goto exit_f; 7761da177e4SLinus Torvalds } 7771da177e4SLinus Torvalds 7784c9483b2SDavid S. Miller if (fl6->flowlabel&IPV6_FLOWINFO_MASK) { 7794c9483b2SDavid S. Miller if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { 7801da177e4SLinus Torvalds err = -EINVAL; 7811da177e4SLinus Torvalds goto exit_f; 7821da177e4SLinus Torvalds } 7831da177e4SLinus Torvalds } 7844c9483b2SDavid S. Miller fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg); 7851da177e4SLinus Torvalds break; 7861da177e4SLinus Torvalds 787333fad53SYOSHIFUJI Hideaki case IPV6_2292HOPOPTS: 7881da177e4SLinus Torvalds case IPV6_HOPOPTS: 7891da177e4SLinus Torvalds if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 7901da177e4SLinus Torvalds err = -EINVAL; 7911da177e4SLinus Torvalds goto exit_f; 7921da177e4SLinus Torvalds } 7931da177e4SLinus Torvalds 7941da177e4SLinus Torvalds hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 7951da177e4SLinus Torvalds len = ((hdr->hdrlen + 1) << 3); 7961da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(len)) { 7971da177e4SLinus Torvalds err = -EINVAL; 7981da177e4SLinus Torvalds goto exit_f; 7991da177e4SLinus Torvalds } 800af31f412SEric W. Biederman if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 8011da177e4SLinus Torvalds err = -EPERM; 8021da177e4SLinus Torvalds goto exit_f; 8031da177e4SLinus Torvalds } 8041da177e4SLinus Torvalds opt->opt_nflen += len; 8051da177e4SLinus Torvalds opt->hopopt = hdr; 8061da177e4SLinus Torvalds break; 8071da177e4SLinus Torvalds 808333fad53SYOSHIFUJI Hideaki case IPV6_2292DSTOPTS: 8091da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 8101da177e4SLinus Torvalds err = -EINVAL; 8111da177e4SLinus Torvalds goto exit_f; 8121da177e4SLinus Torvalds } 8131da177e4SLinus Torvalds 8141da177e4SLinus Torvalds hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 8151da177e4SLinus Torvalds len = ((hdr->hdrlen + 1) << 3); 8161da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(len)) { 8171da177e4SLinus Torvalds err = -EINVAL; 8181da177e4SLinus Torvalds goto exit_f; 8191da177e4SLinus Torvalds } 820af31f412SEric W. Biederman if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 8211da177e4SLinus Torvalds err = -EPERM; 8221da177e4SLinus Torvalds goto exit_f; 8231da177e4SLinus Torvalds } 8241da177e4SLinus Torvalds if (opt->dst1opt) { 8251da177e4SLinus Torvalds err = -EINVAL; 8261da177e4SLinus Torvalds goto exit_f; 8271da177e4SLinus Torvalds } 8281da177e4SLinus Torvalds opt->opt_flen += len; 8291da177e4SLinus Torvalds opt->dst1opt = hdr; 8301da177e4SLinus Torvalds break; 8311da177e4SLinus Torvalds 832333fad53SYOSHIFUJI Hideaki case IPV6_DSTOPTS: 833333fad53SYOSHIFUJI Hideaki case IPV6_RTHDRDSTOPTS: 834333fad53SYOSHIFUJI Hideaki if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 835333fad53SYOSHIFUJI Hideaki err = -EINVAL; 836333fad53SYOSHIFUJI Hideaki goto exit_f; 837333fad53SYOSHIFUJI Hideaki } 838333fad53SYOSHIFUJI Hideaki 839333fad53SYOSHIFUJI Hideaki hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 840333fad53SYOSHIFUJI Hideaki len = ((hdr->hdrlen + 1) << 3); 841333fad53SYOSHIFUJI Hideaki if (cmsg->cmsg_len < CMSG_LEN(len)) { 842333fad53SYOSHIFUJI Hideaki err = -EINVAL; 843333fad53SYOSHIFUJI Hideaki goto exit_f; 844333fad53SYOSHIFUJI Hideaki } 845af31f412SEric W. Biederman if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 846333fad53SYOSHIFUJI Hideaki err = -EPERM; 847333fad53SYOSHIFUJI Hideaki goto exit_f; 848333fad53SYOSHIFUJI Hideaki } 849333fad53SYOSHIFUJI Hideaki if (cmsg->cmsg_type == IPV6_DSTOPTS) { 850333fad53SYOSHIFUJI Hideaki opt->opt_flen += len; 851333fad53SYOSHIFUJI Hideaki opt->dst1opt = hdr; 852333fad53SYOSHIFUJI Hideaki } else { 853333fad53SYOSHIFUJI Hideaki opt->opt_nflen += len; 854333fad53SYOSHIFUJI Hideaki opt->dst0opt = hdr; 855333fad53SYOSHIFUJI Hideaki } 856333fad53SYOSHIFUJI Hideaki break; 857333fad53SYOSHIFUJI Hideaki 858333fad53SYOSHIFUJI Hideaki case IPV6_2292RTHDR: 8591da177e4SLinus Torvalds case IPV6_RTHDR: 8601da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { 8611da177e4SLinus Torvalds err = -EINVAL; 8621da177e4SLinus Torvalds goto exit_f; 8631da177e4SLinus Torvalds } 8641da177e4SLinus Torvalds 8651da177e4SLinus Torvalds rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); 8661da177e4SLinus Torvalds 867280a9d34SMasahide NAKAMURA switch (rthdr->type) { 86807a93626SAmerigo Wang #if IS_ENABLED(CONFIG_IPV6_MIP6) 869280a9d34SMasahide NAKAMURA case IPV6_SRCRT_TYPE_2: 8706e093d9dSBrian Haley if (rthdr->hdrlen != 2 || 8716e093d9dSBrian Haley rthdr->segments_left != 1) { 8726e093d9dSBrian Haley err = -EINVAL; 8736e093d9dSBrian Haley goto exit_f; 8746e093d9dSBrian Haley } 875280a9d34SMasahide NAKAMURA break; 876bb4dbf9eSYOSHIFUJI Hideaki #endif 877280a9d34SMasahide NAKAMURA default: 8781da177e4SLinus Torvalds err = -EINVAL; 8791da177e4SLinus Torvalds goto exit_f; 8801da177e4SLinus Torvalds } 8811da177e4SLinus Torvalds 8821da177e4SLinus Torvalds len = ((rthdr->hdrlen + 1) << 3); 8831da177e4SLinus Torvalds 8841da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(len)) { 8851da177e4SLinus Torvalds err = -EINVAL; 8861da177e4SLinus Torvalds goto exit_f; 8871da177e4SLinus Torvalds } 8881da177e4SLinus Torvalds 8891da177e4SLinus Torvalds /* segments left must also match */ 8901da177e4SLinus Torvalds if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { 8911da177e4SLinus Torvalds err = -EINVAL; 8921da177e4SLinus Torvalds goto exit_f; 8931da177e4SLinus Torvalds } 8941da177e4SLinus Torvalds 8951da177e4SLinus Torvalds opt->opt_nflen += len; 8961da177e4SLinus Torvalds opt->srcrt = rthdr; 8971da177e4SLinus Torvalds 898333fad53SYOSHIFUJI Hideaki if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { 8991da177e4SLinus Torvalds int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); 9001da177e4SLinus Torvalds 9011da177e4SLinus Torvalds opt->opt_nflen += dsthdrlen; 9021da177e4SLinus Torvalds opt->dst0opt = opt->dst1opt; 9031da177e4SLinus Torvalds opt->dst1opt = NULL; 9041da177e4SLinus Torvalds opt->opt_flen -= dsthdrlen; 9051da177e4SLinus Torvalds } 9061da177e4SLinus Torvalds 9071da177e4SLinus Torvalds break; 9081da177e4SLinus Torvalds 909333fad53SYOSHIFUJI Hideaki case IPV6_2292HOPLIMIT: 9101da177e4SLinus Torvalds case IPV6_HOPLIMIT: 9111da177e4SLinus Torvalds if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 9121da177e4SLinus Torvalds err = -EINVAL; 9131da177e4SLinus Torvalds goto exit_f; 9141da177e4SLinus Torvalds } 9151da177e4SLinus Torvalds 9161da177e4SLinus Torvalds *hlimit = *(int *)CMSG_DATA(cmsg); 917e8766fc8SShan Wei if (*hlimit < -1 || *hlimit > 0xff) { 918e8766fc8SShan Wei err = -EINVAL; 919e8766fc8SShan Wei goto exit_f; 920e8766fc8SShan Wei } 921e8766fc8SShan Wei 9221da177e4SLinus Torvalds break; 9231da177e4SLinus Torvalds 92441a1f8eaSYOSHIFUJI Hideaki case IPV6_TCLASS: 92541a1f8eaSYOSHIFUJI Hideaki { 92641a1f8eaSYOSHIFUJI Hideaki int tc; 92741a1f8eaSYOSHIFUJI Hideaki 92841a1f8eaSYOSHIFUJI Hideaki err = -EINVAL; 929b5a4257cSEldad Zack if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 93041a1f8eaSYOSHIFUJI Hideaki goto exit_f; 93141a1f8eaSYOSHIFUJI Hideaki 93241a1f8eaSYOSHIFUJI Hideaki tc = *(int *)CMSG_DATA(cmsg); 933d0ee011fSRemi Denis-Courmont if (tc < -1 || tc > 0xff) 93441a1f8eaSYOSHIFUJI Hideaki goto exit_f; 93541a1f8eaSYOSHIFUJI Hideaki 93641a1f8eaSYOSHIFUJI Hideaki err = 0; 93741a1f8eaSYOSHIFUJI Hideaki *tclass = tc; 93841a1f8eaSYOSHIFUJI Hideaki 93941a1f8eaSYOSHIFUJI Hideaki break; 94041a1f8eaSYOSHIFUJI Hideaki } 94113b52cd4SBrian Haley 94213b52cd4SBrian Haley case IPV6_DONTFRAG: 94313b52cd4SBrian Haley { 94413b52cd4SBrian Haley int df; 94513b52cd4SBrian Haley 94613b52cd4SBrian Haley err = -EINVAL; 947b5a4257cSEldad Zack if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 94813b52cd4SBrian Haley goto exit_f; 94913b52cd4SBrian Haley 95013b52cd4SBrian Haley df = *(int *)CMSG_DATA(cmsg); 95113b52cd4SBrian Haley if (df < 0 || df > 1) 95213b52cd4SBrian Haley goto exit_f; 95313b52cd4SBrian Haley 95413b52cd4SBrian Haley err = 0; 95513b52cd4SBrian Haley *dontfrag = df; 95613b52cd4SBrian Haley 95713b52cd4SBrian Haley break; 95813b52cd4SBrian Haley } 9591da177e4SLinus Torvalds default: 960ba7a46f1SJoe Perches net_dbg_ratelimited("invalid cmsg type: %d\n", 96164ce2073SPatrick McHardy cmsg->cmsg_type); 9621da177e4SLinus Torvalds err = -EINVAL; 9634a36702eSMiao Xie goto exit_f; 9643ff50b79SStephen Hemminger } 9651da177e4SLinus Torvalds } 9661da177e4SLinus Torvalds 9671da177e4SLinus Torvalds exit_f: 9681da177e4SLinus Torvalds return err; 9691da177e4SLinus Torvalds } 97073df66f8STom Parkin EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl); 97117ef66afSLorenzo Colitti 97217ef66afSLorenzo Colitti void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp, 97317ef66afSLorenzo Colitti __u16 srcp, __u16 destp, int bucket) 97417ef66afSLorenzo Colitti { 97517ef66afSLorenzo Colitti const struct in6_addr *dest, *src; 97617ef66afSLorenzo Colitti 977efe4208fSEric Dumazet dest = &sp->sk_v6_daddr; 978efe4208fSEric Dumazet src = &sp->sk_v6_rcv_saddr; 97917ef66afSLorenzo Colitti seq_printf(seq, 98017ef66afSLorenzo Colitti "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 981d14c5ab6SFrancesco Fusco "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n", 98217ef66afSLorenzo Colitti bucket, 98317ef66afSLorenzo Colitti src->s6_addr32[0], src->s6_addr32[1], 98417ef66afSLorenzo Colitti src->s6_addr32[2], src->s6_addr32[3], srcp, 98517ef66afSLorenzo Colitti dest->s6_addr32[0], dest->s6_addr32[1], 98617ef66afSLorenzo Colitti dest->s6_addr32[2], dest->s6_addr32[3], destp, 98717ef66afSLorenzo Colitti sp->sk_state, 98817ef66afSLorenzo Colitti sk_wmem_alloc_get(sp), 98917ef66afSLorenzo Colitti sk_rmem_alloc_get(sp), 99017ef66afSLorenzo Colitti 0, 0L, 0, 99117ef66afSLorenzo Colitti from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), 99217ef66afSLorenzo Colitti 0, 99317ef66afSLorenzo Colitti sock_i_ino(sp), 99417ef66afSLorenzo Colitti atomic_read(&sp->sk_refcnt), sp, 99517ef66afSLorenzo Colitti atomic_read(&sp->sk_drops)); 99617ef66afSLorenzo Colitti } 997