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> 251da177e4SLinus Torvalds 261da177e4SLinus Torvalds #include <net/ipv6.h> 271da177e4SLinus Torvalds #include <net/ndisc.h> 281da177e4SLinus Torvalds #include <net/addrconf.h> 291da177e4SLinus Torvalds #include <net/transp_v6.h> 301da177e4SLinus Torvalds #include <net/ip6_route.h> 31c752f073SArnaldo Carvalho de Melo #include <net/tcp_states.h> 321da177e4SLinus Torvalds 331da177e4SLinus Torvalds #include <linux/errqueue.h> 341da177e4SLinus Torvalds #include <asm/uaccess.h> 351da177e4SLinus Torvalds 36c15fea2dSMax Matveev static inline int ipv6_mapped_addr_any(const struct in6_addr *a) 37c15fea2dSMax Matveev { 38c15fea2dSMax Matveev return (ipv6_addr_v4mapped(a) && (a->s6_addr32[3] == 0)); 39c15fea2dSMax Matveev } 40c15fea2dSMax Matveev 411da177e4SLinus Torvalds int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) 421da177e4SLinus Torvalds { 431da177e4SLinus Torvalds struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; 441da177e4SLinus Torvalds struct inet_sock *inet = inet_sk(sk); 451da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 4620c59de2SArnaud Ebalard struct in6_addr *daddr, *final_p, final; 471da177e4SLinus Torvalds struct dst_entry *dst; 484c9483b2SDavid S. Miller struct flowi6 fl6; 491da177e4SLinus Torvalds struct ip6_flowlabel *flowlabel = NULL; 5020c59de2SArnaud Ebalard struct ipv6_txoptions *opt; 511da177e4SLinus Torvalds int addr_type; 521da177e4SLinus Torvalds int err; 531da177e4SLinus Torvalds 541da177e4SLinus Torvalds if (usin->sin6_family == AF_INET) { 551da177e4SLinus Torvalds if (__ipv6_only_sock(sk)) 561da177e4SLinus Torvalds return -EAFNOSUPPORT; 571da177e4SLinus Torvalds err = ip4_datagram_connect(sk, uaddr, addr_len); 581da177e4SLinus Torvalds goto ipv4_connected; 591da177e4SLinus Torvalds } 601da177e4SLinus Torvalds 611da177e4SLinus Torvalds if (addr_len < SIN6_LEN_RFC2133) 621da177e4SLinus Torvalds return -EINVAL; 631da177e4SLinus Torvalds 641da177e4SLinus Torvalds if (usin->sin6_family != AF_INET6) 651da177e4SLinus Torvalds return -EAFNOSUPPORT; 661da177e4SLinus Torvalds 674c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 681da177e4SLinus Torvalds if (np->sndflow) { 694c9483b2SDavid S. Miller fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; 704c9483b2SDavid S. Miller if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { 714c9483b2SDavid S. Miller flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 721da177e4SLinus Torvalds if (flowlabel == NULL) 731da177e4SLinus Torvalds return -EINVAL; 744e3fd7a0SAlexey Dobriyan usin->sin6_addr = flowlabel->dst; 751da177e4SLinus Torvalds } 761da177e4SLinus Torvalds } 771da177e4SLinus Torvalds 781da177e4SLinus Torvalds addr_type = ipv6_addr_type(&usin->sin6_addr); 791da177e4SLinus Torvalds 801da177e4SLinus Torvalds if (addr_type == IPV6_ADDR_ANY) { 811da177e4SLinus Torvalds /* 821da177e4SLinus Torvalds * connect to self 831da177e4SLinus Torvalds */ 841da177e4SLinus Torvalds usin->sin6_addr.s6_addr[15] = 0x01; 851da177e4SLinus Torvalds } 861da177e4SLinus Torvalds 871da177e4SLinus Torvalds daddr = &usin->sin6_addr; 881da177e4SLinus Torvalds 891da177e4SLinus Torvalds if (addr_type == IPV6_ADDR_MAPPED) { 901da177e4SLinus Torvalds struct sockaddr_in sin; 911da177e4SLinus Torvalds 921da177e4SLinus Torvalds if (__ipv6_only_sock(sk)) { 931da177e4SLinus Torvalds err = -ENETUNREACH; 941da177e4SLinus Torvalds goto out; 951da177e4SLinus Torvalds } 961da177e4SLinus Torvalds sin.sin_family = AF_INET; 971da177e4SLinus Torvalds sin.sin_addr.s_addr = daddr->s6_addr32[3]; 981da177e4SLinus Torvalds sin.sin_port = usin->sin6_port; 991da177e4SLinus Torvalds 1001da177e4SLinus Torvalds err = ip4_datagram_connect(sk, 1011da177e4SLinus Torvalds (struct sockaddr*) &sin, 1021da177e4SLinus Torvalds sizeof(sin)); 1031da177e4SLinus Torvalds 1041da177e4SLinus Torvalds ipv4_connected: 1051da177e4SLinus Torvalds if (err) 1061da177e4SLinus Torvalds goto out; 1071da177e4SLinus Torvalds 108c720c7e8SEric Dumazet ipv6_addr_set_v4mapped(inet->inet_daddr, &np->daddr); 1091da177e4SLinus Torvalds 110c15fea2dSMax Matveev if (ipv6_addr_any(&np->saddr) || 111c15fea2dSMax Matveev ipv6_mapped_addr_any(&np->saddr)) 112c720c7e8SEric Dumazet ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); 1131da177e4SLinus Torvalds 114c15fea2dSMax Matveev if (ipv6_addr_any(&np->rcv_saddr) || 115c15fea2dSMax Matveev ipv6_mapped_addr_any(&np->rcv_saddr)) { 116c720c7e8SEric Dumazet ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, 117c720c7e8SEric Dumazet &np->rcv_saddr); 118719f8358SEric Dumazet if (sk->sk_prot->rehash) 119719f8358SEric Dumazet sk->sk_prot->rehash(sk); 120719f8358SEric Dumazet } 121b301e82cSBrian Haley 1221da177e4SLinus Torvalds goto out; 1231da177e4SLinus Torvalds } 1241da177e4SLinus Torvalds 1251da177e4SLinus Torvalds if (addr_type&IPV6_ADDR_LINKLOCAL) { 1261da177e4SLinus Torvalds if (addr_len >= sizeof(struct sockaddr_in6) && 1271da177e4SLinus Torvalds usin->sin6_scope_id) { 1281da177e4SLinus Torvalds if (sk->sk_bound_dev_if && 1291da177e4SLinus Torvalds sk->sk_bound_dev_if != usin->sin6_scope_id) { 1301da177e4SLinus Torvalds err = -EINVAL; 1311da177e4SLinus Torvalds goto out; 1321da177e4SLinus Torvalds } 1331da177e4SLinus Torvalds sk->sk_bound_dev_if = usin->sin6_scope_id; 1341da177e4SLinus Torvalds } 1351da177e4SLinus Torvalds 1361ac4f008SBrian Haley if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST)) 1371ac4f008SBrian Haley sk->sk_bound_dev_if = np->mcast_oif; 1381ac4f008SBrian Haley 1391da177e4SLinus Torvalds /* Connect to link-local address requires an interface */ 1401da177e4SLinus Torvalds if (!sk->sk_bound_dev_if) { 1411da177e4SLinus Torvalds err = -EINVAL; 1421da177e4SLinus Torvalds goto out; 1431da177e4SLinus Torvalds } 1441da177e4SLinus Torvalds } 1451da177e4SLinus Torvalds 1464e3fd7a0SAlexey Dobriyan np->daddr = *daddr; 1474c9483b2SDavid S. Miller np->flow_label = fl6.flowlabel; 1481da177e4SLinus Torvalds 149c720c7e8SEric Dumazet inet->inet_dport = usin->sin6_port; 1501da177e4SLinus Torvalds 1511da177e4SLinus Torvalds /* 1521da177e4SLinus Torvalds * Check for a route to destination an obtain the 1531da177e4SLinus Torvalds * destination cache for it. 1541da177e4SLinus Torvalds */ 1551da177e4SLinus Torvalds 1564c9483b2SDavid S. Miller fl6.flowi6_proto = sk->sk_protocol; 1574e3fd7a0SAlexey Dobriyan fl6.daddr = np->daddr; 1584e3fd7a0SAlexey Dobriyan fl6.saddr = np->saddr; 1594c9483b2SDavid S. Miller fl6.flowi6_oif = sk->sk_bound_dev_if; 1604c9483b2SDavid S. Miller fl6.flowi6_mark = sk->sk_mark; 1611958b856SDavid S. Miller fl6.fl6_dport = inet->inet_dport; 1621958b856SDavid S. Miller fl6.fl6_sport = inet->inet_sport; 1631da177e4SLinus Torvalds 1644c9483b2SDavid S. Miller if (!fl6.flowi6_oif && (addr_type&IPV6_ADDR_MULTICAST)) 1654c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 1661da177e4SLinus Torvalds 1674c9483b2SDavid S. Miller security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 168beb8d13bSVenkat Yekkirala 16920c59de2SArnaud Ebalard opt = flowlabel ? flowlabel->opt : np->opt; 1704c9483b2SDavid S. Miller final_p = fl6_update_dst(&fl6, opt, &final); 1711da177e4SLinus Torvalds 1724c9483b2SDavid S. Miller dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true); 17368d0c6d3SDavid S. Miller err = 0; 17468d0c6d3SDavid S. Miller if (IS_ERR(dst)) { 17568d0c6d3SDavid S. Miller err = PTR_ERR(dst); 1761da177e4SLinus Torvalds goto out; 17714e50e57SDavid S. Miller } 1781da177e4SLinus Torvalds 1791da177e4SLinus Torvalds /* source address lookup done in ip6_dst_lookup */ 1801da177e4SLinus Torvalds 1811da177e4SLinus Torvalds if (ipv6_addr_any(&np->saddr)) 1824e3fd7a0SAlexey Dobriyan np->saddr = fl6.saddr; 1831da177e4SLinus Torvalds 1841da177e4SLinus Torvalds if (ipv6_addr_any(&np->rcv_saddr)) { 1854e3fd7a0SAlexey Dobriyan np->rcv_saddr = fl6.saddr; 186c720c7e8SEric Dumazet inet->inet_rcv_saddr = LOOPBACK4_IPV6; 187719f8358SEric Dumazet if (sk->sk_prot->rehash) 188719f8358SEric Dumazet sk->sk_prot->rehash(sk); 1891da177e4SLinus Torvalds } 1901da177e4SLinus Torvalds 1911da177e4SLinus Torvalds ip6_dst_store(sk, dst, 1924c9483b2SDavid S. Miller ipv6_addr_equal(&fl6.daddr, &np->daddr) ? 1938e1ef0a9SYOSHIFUJI Hideaki &np->daddr : NULL, 1948e1ef0a9SYOSHIFUJI Hideaki #ifdef CONFIG_IPV6_SUBTREES 1954c9483b2SDavid S. Miller ipv6_addr_equal(&fl6.saddr, &np->saddr) ? 1968e1ef0a9SYOSHIFUJI Hideaki &np->saddr : 1978e1ef0a9SYOSHIFUJI Hideaki #endif 1988e1ef0a9SYOSHIFUJI Hideaki NULL); 1991da177e4SLinus Torvalds 2001da177e4SLinus Torvalds sk->sk_state = TCP_ESTABLISHED; 2011da177e4SLinus Torvalds out: 2021da177e4SLinus Torvalds fl6_sock_release(flowlabel); 2031da177e4SLinus Torvalds return err; 2041da177e4SLinus Torvalds } 2051da177e4SLinus Torvalds 2061da177e4SLinus Torvalds void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 207e69a4adcSAl Viro __be16 port, u32 info, u8 *payload) 2081da177e4SLinus Torvalds { 2091da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 210cc70ab26SArnaldo Carvalho de Melo struct icmp6hdr *icmph = icmp6_hdr(skb); 2111da177e4SLinus Torvalds struct sock_exterr_skb *serr; 2121da177e4SLinus Torvalds 2131da177e4SLinus Torvalds if (!np->recverr) 2141da177e4SLinus Torvalds return; 2151da177e4SLinus Torvalds 2161da177e4SLinus Torvalds skb = skb_clone(skb, GFP_ATOMIC); 2171da177e4SLinus Torvalds if (!skb) 2181da177e4SLinus Torvalds return; 2191da177e4SLinus Torvalds 220d40a4de0SBrian Haley skb->protocol = htons(ETH_P_IPV6); 221d40a4de0SBrian Haley 2221da177e4SLinus Torvalds serr = SKB_EXT_ERR(skb); 2231da177e4SLinus Torvalds serr->ee.ee_errno = err; 2241da177e4SLinus Torvalds serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6; 2251da177e4SLinus Torvalds serr->ee.ee_type = icmph->icmp6_type; 2261da177e4SLinus Torvalds serr->ee.ee_code = icmph->icmp6_code; 2271da177e4SLinus Torvalds serr->ee.ee_pad = 0; 2281da177e4SLinus Torvalds serr->ee.ee_info = info; 2291da177e4SLinus Torvalds serr->ee.ee_data = 0; 230d56f90a7SArnaldo Carvalho de Melo serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) - 231d56f90a7SArnaldo Carvalho de Melo skb_network_header(skb); 2321da177e4SLinus Torvalds serr->port = port; 2331da177e4SLinus Torvalds 2341da177e4SLinus Torvalds __skb_pull(skb, payload - skb->data); 235bd82393cSArnaldo Carvalho de Melo skb_reset_transport_header(skb); 2361da177e4SLinus Torvalds 2371da177e4SLinus Torvalds if (sock_queue_err_skb(sk, skb)) 2381da177e4SLinus Torvalds kfree_skb(skb); 2391da177e4SLinus Torvalds } 2401da177e4SLinus Torvalds 2414c9483b2SDavid S. Miller void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info) 2421da177e4SLinus Torvalds { 2431da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 2441da177e4SLinus Torvalds struct sock_exterr_skb *serr; 2451da177e4SLinus Torvalds struct ipv6hdr *iph; 2461da177e4SLinus Torvalds struct sk_buff *skb; 2471da177e4SLinus Torvalds 2481da177e4SLinus Torvalds if (!np->recverr) 2491da177e4SLinus Torvalds return; 2501da177e4SLinus Torvalds 2511da177e4SLinus Torvalds skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 2521da177e4SLinus Torvalds if (!skb) 2531da177e4SLinus Torvalds return; 2541da177e4SLinus Torvalds 255d40a4de0SBrian Haley skb->protocol = htons(ETH_P_IPV6); 256d40a4de0SBrian Haley 2571ced98e8SArnaldo Carvalho de Melo skb_put(skb, sizeof(struct ipv6hdr)); 2581ced98e8SArnaldo Carvalho de Melo skb_reset_network_header(skb); 2590660e03fSArnaldo Carvalho de Melo iph = ipv6_hdr(skb); 2604e3fd7a0SAlexey Dobriyan iph->daddr = fl6->daddr; 2611da177e4SLinus Torvalds 2621da177e4SLinus Torvalds serr = SKB_EXT_ERR(skb); 2631da177e4SLinus Torvalds serr->ee.ee_errno = err; 2641da177e4SLinus Torvalds serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 2651da177e4SLinus Torvalds serr->ee.ee_type = 0; 2661da177e4SLinus Torvalds serr->ee.ee_code = 0; 2671da177e4SLinus Torvalds serr->ee.ee_pad = 0; 2681da177e4SLinus Torvalds serr->ee.ee_info = info; 2691da177e4SLinus Torvalds serr->ee.ee_data = 0; 270d56f90a7SArnaldo Carvalho de Melo serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); 2711958b856SDavid S. Miller serr->port = fl6->fl6_dport; 2721da177e4SLinus Torvalds 27327a884dcSArnaldo Carvalho de Melo __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 274bd82393cSArnaldo Carvalho de Melo skb_reset_transport_header(skb); 2751da177e4SLinus Torvalds 2761da177e4SLinus Torvalds if (sock_queue_err_skb(sk, skb)) 2771da177e4SLinus Torvalds kfree_skb(skb); 2781da177e4SLinus Torvalds } 2791da177e4SLinus Torvalds 2804c9483b2SDavid S. Miller void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu) 2814b340ae2SBrian Haley { 2824b340ae2SBrian Haley struct ipv6_pinfo *np = inet6_sk(sk); 2834b340ae2SBrian Haley struct ipv6hdr *iph; 2844b340ae2SBrian Haley struct sk_buff *skb; 2854b340ae2SBrian Haley struct ip6_mtuinfo *mtu_info; 2864b340ae2SBrian Haley 2874b340ae2SBrian Haley if (!np->rxopt.bits.rxpmtu) 2884b340ae2SBrian Haley return; 2894b340ae2SBrian Haley 2904b340ae2SBrian Haley skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 2914b340ae2SBrian Haley if (!skb) 2924b340ae2SBrian Haley return; 2934b340ae2SBrian Haley 2944b340ae2SBrian Haley skb_put(skb, sizeof(struct ipv6hdr)); 2954b340ae2SBrian Haley skb_reset_network_header(skb); 2964b340ae2SBrian Haley iph = ipv6_hdr(skb); 2974e3fd7a0SAlexey Dobriyan iph->daddr = fl6->daddr; 2984b340ae2SBrian Haley 2994b340ae2SBrian Haley mtu_info = IP6CBMTU(skb); 3004b340ae2SBrian Haley 3014b340ae2SBrian Haley mtu_info->ip6m_mtu = mtu; 3024b340ae2SBrian Haley mtu_info->ip6m_addr.sin6_family = AF_INET6; 3034b340ae2SBrian Haley mtu_info->ip6m_addr.sin6_port = 0; 3044b340ae2SBrian Haley mtu_info->ip6m_addr.sin6_flowinfo = 0; 3054c9483b2SDavid S. Miller mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif; 3064e3fd7a0SAlexey Dobriyan mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr; 3074b340ae2SBrian Haley 3084b340ae2SBrian Haley __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 3094b340ae2SBrian Haley skb_reset_transport_header(skb); 3104b340ae2SBrian Haley 3114b340ae2SBrian Haley skb = xchg(&np->rxpmtu, skb); 3124b340ae2SBrian Haley kfree_skb(skb); 3134b340ae2SBrian Haley } 3144b340ae2SBrian Haley 3151da177e4SLinus Torvalds /* 3161da177e4SLinus Torvalds * Handle MSG_ERRQUEUE 3171da177e4SLinus Torvalds */ 3181da177e4SLinus Torvalds int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len) 3191da177e4SLinus Torvalds { 3201da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 3211da177e4SLinus Torvalds struct sock_exterr_skb *serr; 3221da177e4SLinus Torvalds struct sk_buff *skb, *skb2; 3231da177e4SLinus Torvalds struct sockaddr_in6 *sin; 3241da177e4SLinus Torvalds struct { 3251da177e4SLinus Torvalds struct sock_extended_err ee; 3261da177e4SLinus Torvalds struct sockaddr_in6 offender; 3271da177e4SLinus Torvalds } errhdr; 3281da177e4SLinus Torvalds int err; 3291da177e4SLinus Torvalds int copied; 3301da177e4SLinus Torvalds 3311da177e4SLinus Torvalds err = -EAGAIN; 3321da177e4SLinus Torvalds skb = skb_dequeue(&sk->sk_error_queue); 3331da177e4SLinus Torvalds if (skb == NULL) 3341da177e4SLinus Torvalds goto out; 3351da177e4SLinus Torvalds 3361da177e4SLinus Torvalds copied = skb->len; 3371da177e4SLinus Torvalds if (copied > len) { 3381da177e4SLinus Torvalds msg->msg_flags |= MSG_TRUNC; 3391da177e4SLinus Torvalds copied = len; 3401da177e4SLinus Torvalds } 3411da177e4SLinus Torvalds err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 3421da177e4SLinus Torvalds if (err) 3431da177e4SLinus Torvalds goto out_free_skb; 3441da177e4SLinus Torvalds 3451da177e4SLinus Torvalds sock_recv_timestamp(msg, sk, skb); 3461da177e4SLinus Torvalds 3471da177e4SLinus Torvalds serr = SKB_EXT_ERR(skb); 3481da177e4SLinus Torvalds 3491da177e4SLinus Torvalds sin = (struct sockaddr_in6 *)msg->msg_name; 3501da177e4SLinus Torvalds if (sin) { 351d56f90a7SArnaldo Carvalho de Melo const unsigned char *nh = skb_network_header(skb); 3521da177e4SLinus Torvalds sin->sin6_family = AF_INET6; 3531da177e4SLinus Torvalds sin->sin6_flowinfo = 0; 3541da177e4SLinus Torvalds sin->sin6_port = serr->port; 3551da177e4SLinus Torvalds sin->sin6_scope_id = 0; 356d40a4de0SBrian Haley if (skb->protocol == htons(ETH_P_IPV6)) { 3574e3fd7a0SAlexey Dobriyan sin->sin6_addr = 3584e3fd7a0SAlexey Dobriyan *(struct in6_addr *)(nh + serr->addr_offset); 3591da177e4SLinus Torvalds if (np->sndflow) 360d56f90a7SArnaldo Carvalho de Melo sin->sin6_flowinfo = 361d56f90a7SArnaldo Carvalho de Melo (*(__be32 *)(nh + serr->addr_offset - 24) & 362d56f90a7SArnaldo Carvalho de Melo IPV6_FLOWINFO_MASK); 3631da177e4SLinus Torvalds if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 3641da177e4SLinus Torvalds sin->sin6_scope_id = IP6CB(skb)->iif; 3651da177e4SLinus Torvalds } else { 366b301e82cSBrian Haley ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset), 367b301e82cSBrian Haley &sin->sin6_addr); 3681da177e4SLinus Torvalds } 3691da177e4SLinus Torvalds } 3701da177e4SLinus Torvalds 3711da177e4SLinus Torvalds memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 3721da177e4SLinus Torvalds sin = &errhdr.offender; 3731da177e4SLinus Torvalds sin->sin6_family = AF_UNSPEC; 3741da177e4SLinus Torvalds if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) { 3751da177e4SLinus Torvalds sin->sin6_family = AF_INET6; 3761da177e4SLinus Torvalds sin->sin6_flowinfo = 0; 3771da177e4SLinus Torvalds sin->sin6_scope_id = 0; 378d40a4de0SBrian Haley if (skb->protocol == htons(ETH_P_IPV6)) { 3794e3fd7a0SAlexey Dobriyan sin->sin6_addr = ipv6_hdr(skb)->saddr; 3801da177e4SLinus Torvalds if (np->rxopt.all) 3811da177e4SLinus Torvalds datagram_recv_ctl(sk, msg, skb); 3821da177e4SLinus Torvalds if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 3831da177e4SLinus Torvalds sin->sin6_scope_id = IP6CB(skb)->iif; 3841da177e4SLinus Torvalds } else { 3851da177e4SLinus Torvalds struct inet_sock *inet = inet_sk(sk); 3861da177e4SLinus Torvalds 387b301e82cSBrian Haley ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 388b301e82cSBrian Haley &sin->sin6_addr); 3891da177e4SLinus Torvalds if (inet->cmsg_flags) 3901da177e4SLinus Torvalds ip_cmsg_recv(msg, skb); 3911da177e4SLinus Torvalds } 3921da177e4SLinus Torvalds } 3931da177e4SLinus Torvalds 3941da177e4SLinus Torvalds put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr); 3951da177e4SLinus Torvalds 3961da177e4SLinus Torvalds /* Now we could try to dump offended packet options */ 3971da177e4SLinus Torvalds 3981da177e4SLinus Torvalds msg->msg_flags |= MSG_ERRQUEUE; 3991da177e4SLinus Torvalds err = copied; 4001da177e4SLinus Torvalds 4011da177e4SLinus Torvalds /* Reset and regenerate socket error */ 402e0f9f858SHerbert Xu spin_lock_bh(&sk->sk_error_queue.lock); 4031da177e4SLinus Torvalds sk->sk_err = 0; 4041da177e4SLinus Torvalds if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) { 4051da177e4SLinus Torvalds sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; 406e0f9f858SHerbert Xu spin_unlock_bh(&sk->sk_error_queue.lock); 4071da177e4SLinus Torvalds sk->sk_error_report(sk); 4081da177e4SLinus Torvalds } else { 409e0f9f858SHerbert Xu spin_unlock_bh(&sk->sk_error_queue.lock); 4101da177e4SLinus Torvalds } 4111da177e4SLinus Torvalds 4121da177e4SLinus Torvalds out_free_skb: 4131da177e4SLinus Torvalds kfree_skb(skb); 4141da177e4SLinus Torvalds out: 4151da177e4SLinus Torvalds return err; 4161da177e4SLinus Torvalds } 4171da177e4SLinus Torvalds 4184b340ae2SBrian Haley /* 4194b340ae2SBrian Haley * Handle IPV6_RECVPATHMTU 4204b340ae2SBrian Haley */ 4214b340ae2SBrian Haley int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len) 4224b340ae2SBrian Haley { 4234b340ae2SBrian Haley struct ipv6_pinfo *np = inet6_sk(sk); 4244b340ae2SBrian Haley struct sk_buff *skb; 4254b340ae2SBrian Haley struct sockaddr_in6 *sin; 4264b340ae2SBrian Haley struct ip6_mtuinfo mtu_info; 4274b340ae2SBrian Haley int err; 4284b340ae2SBrian Haley int copied; 4294b340ae2SBrian Haley 4304b340ae2SBrian Haley err = -EAGAIN; 4314b340ae2SBrian Haley skb = xchg(&np->rxpmtu, NULL); 4324b340ae2SBrian Haley if (skb == NULL) 4334b340ae2SBrian Haley goto out; 4344b340ae2SBrian Haley 4354b340ae2SBrian Haley copied = skb->len; 4364b340ae2SBrian Haley if (copied > len) { 4374b340ae2SBrian Haley msg->msg_flags |= MSG_TRUNC; 4384b340ae2SBrian Haley copied = len; 4394b340ae2SBrian Haley } 4404b340ae2SBrian Haley err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 4414b340ae2SBrian Haley if (err) 4424b340ae2SBrian Haley goto out_free_skb; 4434b340ae2SBrian Haley 4444b340ae2SBrian Haley sock_recv_timestamp(msg, sk, skb); 4454b340ae2SBrian Haley 4464b340ae2SBrian Haley memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info)); 4474b340ae2SBrian Haley 4484b340ae2SBrian Haley sin = (struct sockaddr_in6 *)msg->msg_name; 4494b340ae2SBrian Haley if (sin) { 4504b340ae2SBrian Haley sin->sin6_family = AF_INET6; 4514b340ae2SBrian Haley sin->sin6_flowinfo = 0; 4524b340ae2SBrian Haley sin->sin6_port = 0; 4534b340ae2SBrian Haley sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id; 4544e3fd7a0SAlexey Dobriyan sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr; 4554b340ae2SBrian Haley } 4564b340ae2SBrian Haley 4574b340ae2SBrian Haley put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info); 4584b340ae2SBrian Haley 4594b340ae2SBrian Haley err = copied; 4604b340ae2SBrian Haley 4614b340ae2SBrian Haley out_free_skb: 4624b340ae2SBrian Haley kfree_skb(skb); 4634b340ae2SBrian Haley out: 4644b340ae2SBrian Haley return err; 4654b340ae2SBrian Haley } 4661da177e4SLinus Torvalds 4671da177e4SLinus Torvalds 4681da177e4SLinus Torvalds int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb) 4691da177e4SLinus Torvalds { 4701da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 4711da177e4SLinus Torvalds struct inet6_skb_parm *opt = IP6CB(skb); 472d56f90a7SArnaldo Carvalho de Melo unsigned char *nh = skb_network_header(skb); 4731da177e4SLinus Torvalds 4741da177e4SLinus Torvalds if (np->rxopt.bits.rxinfo) { 4751da177e4SLinus Torvalds struct in6_pktinfo src_info; 4761da177e4SLinus Torvalds 4771da177e4SLinus Torvalds src_info.ipi6_ifindex = opt->iif; 4784e3fd7a0SAlexey Dobriyan src_info.ipi6_addr = ipv6_hdr(skb)->daddr; 4791da177e4SLinus Torvalds put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 4801da177e4SLinus Torvalds } 4811da177e4SLinus Torvalds 4821da177e4SLinus Torvalds if (np->rxopt.bits.rxhlim) { 4830660e03fSArnaldo Carvalho de Melo int hlim = ipv6_hdr(skb)->hop_limit; 4841da177e4SLinus Torvalds put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 4851da177e4SLinus Torvalds } 4861da177e4SLinus Torvalds 48741a1f8eaSYOSHIFUJI Hideaki if (np->rxopt.bits.rxtclass) { 4880660e03fSArnaldo Carvalho de Melo int tclass = (ntohl(*(__be32 *)ipv6_hdr(skb)) >> 20) & 0xff; 48941a1f8eaSYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 49041a1f8eaSYOSHIFUJI Hideaki } 49141a1f8eaSYOSHIFUJI Hideaki 492d56f90a7SArnaldo Carvalho de Melo if (np->rxopt.bits.rxflow && (*(__be32 *)nh & IPV6_FLOWINFO_MASK)) { 493d56f90a7SArnaldo Carvalho de Melo __be32 flowinfo = *(__be32 *)nh & IPV6_FLOWINFO_MASK; 4941da177e4SLinus Torvalds put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 4951da177e4SLinus Torvalds } 496333fad53SYOSHIFUJI Hideaki 497333fad53SYOSHIFUJI Hideaki /* HbH is allowed only once */ 4981da177e4SLinus Torvalds if (np->rxopt.bits.hopopts && opt->hop) { 499d56f90a7SArnaldo Carvalho de Melo u8 *ptr = nh + opt->hop; 5001da177e4SLinus Torvalds put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); 5011da177e4SLinus Torvalds } 502333fad53SYOSHIFUJI Hideaki 503333fad53SYOSHIFUJI Hideaki if (opt->lastopt && 504333fad53SYOSHIFUJI Hideaki (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { 505333fad53SYOSHIFUJI Hideaki /* 506333fad53SYOSHIFUJI Hideaki * Silly enough, but we need to reparse in order to 507333fad53SYOSHIFUJI Hideaki * report extension headers (except for HbH) 508333fad53SYOSHIFUJI Hideaki * in order. 509333fad53SYOSHIFUJI Hideaki * 510333fad53SYOSHIFUJI Hideaki * Also note that IPV6_RECVRTHDRDSTOPTS is NOT 511333fad53SYOSHIFUJI Hideaki * (and WILL NOT be) defined because 512333fad53SYOSHIFUJI Hideaki * IPV6_RECVDSTOPTS is more generic. --yoshfuji 513333fad53SYOSHIFUJI Hideaki */ 514333fad53SYOSHIFUJI Hideaki unsigned int off = sizeof(struct ipv6hdr); 5150660e03fSArnaldo Carvalho de Melo u8 nexthdr = ipv6_hdr(skb)->nexthdr; 516333fad53SYOSHIFUJI Hideaki 517333fad53SYOSHIFUJI Hideaki while (off <= opt->lastopt) { 518333fad53SYOSHIFUJI Hideaki unsigned len; 519d56f90a7SArnaldo Carvalho de Melo u8 *ptr = nh + off; 520333fad53SYOSHIFUJI Hideaki 521333fad53SYOSHIFUJI Hideaki switch(nexthdr) { 522333fad53SYOSHIFUJI Hideaki case IPPROTO_DSTOPTS: 523333fad53SYOSHIFUJI Hideaki nexthdr = ptr[0]; 524333fad53SYOSHIFUJI Hideaki len = (ptr[1] + 1) << 3; 525333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.dstopts) 526333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr); 527333fad53SYOSHIFUJI Hideaki break; 528333fad53SYOSHIFUJI Hideaki case IPPROTO_ROUTING: 529333fad53SYOSHIFUJI Hideaki nexthdr = ptr[0]; 530333fad53SYOSHIFUJI Hideaki len = (ptr[1] + 1) << 3; 531333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.srcrt) 532333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr); 533333fad53SYOSHIFUJI Hideaki break; 534333fad53SYOSHIFUJI Hideaki case IPPROTO_AH: 535333fad53SYOSHIFUJI Hideaki nexthdr = ptr[0]; 536a3059893SVille Nuorvala len = (ptr[1] + 2) << 2; 537333fad53SYOSHIFUJI Hideaki break; 538333fad53SYOSHIFUJI Hideaki default: 539333fad53SYOSHIFUJI Hideaki nexthdr = ptr[0]; 540333fad53SYOSHIFUJI Hideaki len = (ptr[1] + 1) << 3; 541333fad53SYOSHIFUJI Hideaki break; 542333fad53SYOSHIFUJI Hideaki } 543333fad53SYOSHIFUJI Hideaki 544333fad53SYOSHIFUJI Hideaki off += len; 545333fad53SYOSHIFUJI Hideaki } 546333fad53SYOSHIFUJI Hideaki } 547333fad53SYOSHIFUJI Hideaki 548333fad53SYOSHIFUJI Hideaki /* socket options in old style */ 549333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.rxoinfo) { 550333fad53SYOSHIFUJI Hideaki struct in6_pktinfo src_info; 551333fad53SYOSHIFUJI Hideaki 552333fad53SYOSHIFUJI Hideaki src_info.ipi6_ifindex = opt->iif; 5534e3fd7a0SAlexey Dobriyan src_info.ipi6_addr = ipv6_hdr(skb)->daddr; 554333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 555333fad53SYOSHIFUJI Hideaki } 556333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.rxohlim) { 5570660e03fSArnaldo Carvalho de Melo int hlim = ipv6_hdr(skb)->hop_limit; 558333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 559333fad53SYOSHIFUJI Hideaki } 560333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.ohopopts && opt->hop) { 561d56f90a7SArnaldo Carvalho de Melo u8 *ptr = nh + opt->hop; 562333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr); 563333fad53SYOSHIFUJI Hideaki } 564333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.odstopts && opt->dst0) { 565d56f90a7SArnaldo Carvalho de Melo u8 *ptr = nh + opt->dst0; 566333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 5671da177e4SLinus Torvalds } 568333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.osrcrt && opt->srcrt) { 569d56f90a7SArnaldo Carvalho de Melo struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt); 570333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr); 5711da177e4SLinus Torvalds } 572333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.odstopts && opt->dst1) { 573d56f90a7SArnaldo Carvalho de Melo u8 *ptr = nh + opt->dst1; 574333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 5751da177e4SLinus Torvalds } 5766c468622SBalazs Scheidler if (np->rxopt.bits.rxorigdstaddr) { 5776c468622SBalazs Scheidler struct sockaddr_in6 sin6; 578747465efSEric Dumazet __be16 *ports = (__be16 *) skb_transport_header(skb); 5796c468622SBalazs Scheidler 5806c468622SBalazs Scheidler if (skb_transport_offset(skb) + 4 <= skb->len) { 5816c468622SBalazs Scheidler /* All current transport protocols have the port numbers in the 5826c468622SBalazs Scheidler * first four bytes of the transport header and this function is 5836c468622SBalazs Scheidler * written with this assumption in mind. 5846c468622SBalazs Scheidler */ 5856c468622SBalazs Scheidler 5866c468622SBalazs Scheidler sin6.sin6_family = AF_INET6; 5874e3fd7a0SAlexey Dobriyan sin6.sin6_addr = ipv6_hdr(skb)->daddr; 5886c468622SBalazs Scheidler sin6.sin6_port = ports[1]; 5896c468622SBalazs Scheidler sin6.sin6_flowinfo = 0; 5906c468622SBalazs Scheidler sin6.sin6_scope_id = 0; 5916c468622SBalazs Scheidler 5926c468622SBalazs Scheidler put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6); 5936c468622SBalazs Scheidler } 5946c468622SBalazs Scheidler } 5951da177e4SLinus Torvalds return 0; 5961da177e4SLinus Torvalds } 5971da177e4SLinus Torvalds 598ec0506dbSMaciej Żenczykowski int datagram_send_ctl(struct net *net, struct sock *sk, 5994c9483b2SDavid S. Miller struct msghdr *msg, struct flowi6 *fl6, 6001da177e4SLinus Torvalds struct ipv6_txoptions *opt, 60113b52cd4SBrian Haley int *hlimit, int *tclass, int *dontfrag) 6021da177e4SLinus Torvalds { 6031da177e4SLinus Torvalds struct in6_pktinfo *src_info; 6041da177e4SLinus Torvalds struct cmsghdr *cmsg; 6051da177e4SLinus Torvalds struct ipv6_rt_hdr *rthdr; 6061da177e4SLinus Torvalds struct ipv6_opt_hdr *hdr; 6071da177e4SLinus Torvalds int len; 6081da177e4SLinus Torvalds int err = 0; 6091da177e4SLinus Torvalds 6101da177e4SLinus Torvalds for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { 6111da177e4SLinus Torvalds int addr_type; 6121da177e4SLinus Torvalds 6131da177e4SLinus Torvalds if (!CMSG_OK(msg, cmsg)) { 6141da177e4SLinus Torvalds err = -EINVAL; 6151da177e4SLinus Torvalds goto exit_f; 6161da177e4SLinus Torvalds } 6171da177e4SLinus Torvalds 6181da177e4SLinus Torvalds if (cmsg->cmsg_level != SOL_IPV6) 6191da177e4SLinus Torvalds continue; 6201da177e4SLinus Torvalds 6211da177e4SLinus Torvalds switch (cmsg->cmsg_type) { 6221da177e4SLinus Torvalds case IPV6_PKTINFO: 623333fad53SYOSHIFUJI Hideaki case IPV6_2292PKTINFO: 624187e3838SYOSHIFUJI Hideaki { 625187e3838SYOSHIFUJI Hideaki struct net_device *dev = NULL; 626187e3838SYOSHIFUJI Hideaki 6271da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { 6281da177e4SLinus Torvalds err = -EINVAL; 6291da177e4SLinus Torvalds goto exit_f; 6301da177e4SLinus Torvalds } 6311da177e4SLinus Torvalds 6321da177e4SLinus Torvalds src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); 6331da177e4SLinus Torvalds 6341da177e4SLinus Torvalds if (src_info->ipi6_ifindex) { 6354c9483b2SDavid S. Miller if (fl6->flowi6_oif && 6364c9483b2SDavid S. Miller src_info->ipi6_ifindex != fl6->flowi6_oif) 6371da177e4SLinus Torvalds return -EINVAL; 6384c9483b2SDavid S. Miller fl6->flowi6_oif = src_info->ipi6_ifindex; 6391da177e4SLinus Torvalds } 6401da177e4SLinus Torvalds 641187e3838SYOSHIFUJI Hideaki addr_type = __ipv6_addr_type(&src_info->ipi6_addr); 6421da177e4SLinus Torvalds 643536b2e92SEric Dumazet rcu_read_lock(); 6444c9483b2SDavid S. Miller if (fl6->flowi6_oif) { 6454c9483b2SDavid S. Miller dev = dev_get_by_index_rcu(net, fl6->flowi6_oif); 646536b2e92SEric Dumazet if (!dev) { 647536b2e92SEric Dumazet rcu_read_unlock(); 6481da177e4SLinus Torvalds return -ENODEV; 649536b2e92SEric Dumazet } 650536b2e92SEric Dumazet } else if (addr_type & IPV6_ADDR_LINKLOCAL) { 651536b2e92SEric Dumazet rcu_read_unlock(); 652187e3838SYOSHIFUJI Hideaki return -EINVAL; 653536b2e92SEric Dumazet } 654187e3838SYOSHIFUJI Hideaki 655187e3838SYOSHIFUJI Hideaki if (addr_type != IPV6_ADDR_ANY) { 656187e3838SYOSHIFUJI Hideaki int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL; 6572563fa59SMaciej Żenczykowski if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) && 658ec0506dbSMaciej Żenczykowski !ipv6_chk_addr(net, &src_info->ipi6_addr, 659187e3838SYOSHIFUJI Hideaki strict ? dev : NULL, 0)) 6601da177e4SLinus Torvalds err = -EINVAL; 661187e3838SYOSHIFUJI Hideaki else 6624e3fd7a0SAlexey Dobriyan fl6->saddr = src_info->ipi6_addr; 6631da177e4SLinus Torvalds } 664187e3838SYOSHIFUJI Hideaki 665536b2e92SEric Dumazet rcu_read_unlock(); 6661da177e4SLinus Torvalds 667187e3838SYOSHIFUJI Hideaki if (err) 668187e3838SYOSHIFUJI Hideaki goto exit_f; 669187e3838SYOSHIFUJI Hideaki 6701da177e4SLinus Torvalds break; 671187e3838SYOSHIFUJI Hideaki } 6721da177e4SLinus Torvalds 6731da177e4SLinus Torvalds case IPV6_FLOWINFO: 6741da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(4)) { 6751da177e4SLinus Torvalds err = -EINVAL; 6761da177e4SLinus Torvalds goto exit_f; 6771da177e4SLinus Torvalds } 6781da177e4SLinus Torvalds 6794c9483b2SDavid S. Miller if (fl6->flowlabel&IPV6_FLOWINFO_MASK) { 6804c9483b2SDavid S. Miller if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { 6811da177e4SLinus Torvalds err = -EINVAL; 6821da177e4SLinus Torvalds goto exit_f; 6831da177e4SLinus Torvalds } 6841da177e4SLinus Torvalds } 6854c9483b2SDavid S. Miller fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg); 6861da177e4SLinus Torvalds break; 6871da177e4SLinus Torvalds 688333fad53SYOSHIFUJI Hideaki case IPV6_2292HOPOPTS: 6891da177e4SLinus Torvalds case IPV6_HOPOPTS: 6901da177e4SLinus Torvalds if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 6911da177e4SLinus Torvalds err = -EINVAL; 6921da177e4SLinus Torvalds goto exit_f; 6931da177e4SLinus Torvalds } 6941da177e4SLinus Torvalds 6951da177e4SLinus Torvalds hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 6961da177e4SLinus Torvalds len = ((hdr->hdrlen + 1) << 3); 6971da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(len)) { 6981da177e4SLinus Torvalds err = -EINVAL; 6991da177e4SLinus Torvalds goto exit_f; 7001da177e4SLinus Torvalds } 7011da177e4SLinus Torvalds if (!capable(CAP_NET_RAW)) { 7021da177e4SLinus Torvalds err = -EPERM; 7031da177e4SLinus Torvalds goto exit_f; 7041da177e4SLinus Torvalds } 7051da177e4SLinus Torvalds opt->opt_nflen += len; 7061da177e4SLinus Torvalds opt->hopopt = hdr; 7071da177e4SLinus Torvalds break; 7081da177e4SLinus Torvalds 709333fad53SYOSHIFUJI Hideaki case IPV6_2292DSTOPTS: 7101da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 7111da177e4SLinus Torvalds err = -EINVAL; 7121da177e4SLinus Torvalds goto exit_f; 7131da177e4SLinus Torvalds } 7141da177e4SLinus Torvalds 7151da177e4SLinus Torvalds hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 7161da177e4SLinus Torvalds len = ((hdr->hdrlen + 1) << 3); 7171da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(len)) { 7181da177e4SLinus Torvalds err = -EINVAL; 7191da177e4SLinus Torvalds goto exit_f; 7201da177e4SLinus Torvalds } 7211da177e4SLinus Torvalds if (!capable(CAP_NET_RAW)) { 7221da177e4SLinus Torvalds err = -EPERM; 7231da177e4SLinus Torvalds goto exit_f; 7241da177e4SLinus Torvalds } 7251da177e4SLinus Torvalds if (opt->dst1opt) { 7261da177e4SLinus Torvalds err = -EINVAL; 7271da177e4SLinus Torvalds goto exit_f; 7281da177e4SLinus Torvalds } 7291da177e4SLinus Torvalds opt->opt_flen += len; 7301da177e4SLinus Torvalds opt->dst1opt = hdr; 7311da177e4SLinus Torvalds break; 7321da177e4SLinus Torvalds 733333fad53SYOSHIFUJI Hideaki case IPV6_DSTOPTS: 734333fad53SYOSHIFUJI Hideaki case IPV6_RTHDRDSTOPTS: 735333fad53SYOSHIFUJI Hideaki if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 736333fad53SYOSHIFUJI Hideaki err = -EINVAL; 737333fad53SYOSHIFUJI Hideaki goto exit_f; 738333fad53SYOSHIFUJI Hideaki } 739333fad53SYOSHIFUJI Hideaki 740333fad53SYOSHIFUJI Hideaki hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 741333fad53SYOSHIFUJI Hideaki len = ((hdr->hdrlen + 1) << 3); 742333fad53SYOSHIFUJI Hideaki if (cmsg->cmsg_len < CMSG_LEN(len)) { 743333fad53SYOSHIFUJI Hideaki err = -EINVAL; 744333fad53SYOSHIFUJI Hideaki goto exit_f; 745333fad53SYOSHIFUJI Hideaki } 746333fad53SYOSHIFUJI Hideaki if (!capable(CAP_NET_RAW)) { 747333fad53SYOSHIFUJI Hideaki err = -EPERM; 748333fad53SYOSHIFUJI Hideaki goto exit_f; 749333fad53SYOSHIFUJI Hideaki } 750333fad53SYOSHIFUJI Hideaki if (cmsg->cmsg_type == IPV6_DSTOPTS) { 751333fad53SYOSHIFUJI Hideaki opt->opt_flen += len; 752333fad53SYOSHIFUJI Hideaki opt->dst1opt = hdr; 753333fad53SYOSHIFUJI Hideaki } else { 754333fad53SYOSHIFUJI Hideaki opt->opt_nflen += len; 755333fad53SYOSHIFUJI Hideaki opt->dst0opt = hdr; 756333fad53SYOSHIFUJI Hideaki } 757333fad53SYOSHIFUJI Hideaki break; 758333fad53SYOSHIFUJI Hideaki 759333fad53SYOSHIFUJI Hideaki case IPV6_2292RTHDR: 7601da177e4SLinus Torvalds case IPV6_RTHDR: 7611da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { 7621da177e4SLinus Torvalds err = -EINVAL; 7631da177e4SLinus Torvalds goto exit_f; 7641da177e4SLinus Torvalds } 7651da177e4SLinus Torvalds 7661da177e4SLinus Torvalds rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); 7671da177e4SLinus Torvalds 768280a9d34SMasahide NAKAMURA switch (rthdr->type) { 76959fbb3a6SMasahide NAKAMURA #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 770280a9d34SMasahide NAKAMURA case IPV6_SRCRT_TYPE_2: 7716e093d9dSBrian Haley if (rthdr->hdrlen != 2 || 7726e093d9dSBrian Haley rthdr->segments_left != 1) { 7736e093d9dSBrian Haley err = -EINVAL; 7746e093d9dSBrian Haley goto exit_f; 7756e093d9dSBrian Haley } 776280a9d34SMasahide NAKAMURA break; 777bb4dbf9eSYOSHIFUJI Hideaki #endif 778280a9d34SMasahide NAKAMURA default: 7791da177e4SLinus Torvalds err = -EINVAL; 7801da177e4SLinus Torvalds goto exit_f; 7811da177e4SLinus Torvalds } 7821da177e4SLinus Torvalds 7831da177e4SLinus Torvalds len = ((rthdr->hdrlen + 1) << 3); 7841da177e4SLinus Torvalds 7851da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(len)) { 7861da177e4SLinus Torvalds err = -EINVAL; 7871da177e4SLinus Torvalds goto exit_f; 7881da177e4SLinus Torvalds } 7891da177e4SLinus Torvalds 7901da177e4SLinus Torvalds /* segments left must also match */ 7911da177e4SLinus Torvalds if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { 7921da177e4SLinus Torvalds err = -EINVAL; 7931da177e4SLinus Torvalds goto exit_f; 7941da177e4SLinus Torvalds } 7951da177e4SLinus Torvalds 7961da177e4SLinus Torvalds opt->opt_nflen += len; 7971da177e4SLinus Torvalds opt->srcrt = rthdr; 7981da177e4SLinus Torvalds 799333fad53SYOSHIFUJI Hideaki if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { 8001da177e4SLinus Torvalds int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); 8011da177e4SLinus Torvalds 8021da177e4SLinus Torvalds opt->opt_nflen += dsthdrlen; 8031da177e4SLinus Torvalds opt->dst0opt = opt->dst1opt; 8041da177e4SLinus Torvalds opt->dst1opt = NULL; 8051da177e4SLinus Torvalds opt->opt_flen -= dsthdrlen; 8061da177e4SLinus Torvalds } 8071da177e4SLinus Torvalds 8081da177e4SLinus Torvalds break; 8091da177e4SLinus Torvalds 810333fad53SYOSHIFUJI Hideaki case IPV6_2292HOPLIMIT: 8111da177e4SLinus Torvalds case IPV6_HOPLIMIT: 8121da177e4SLinus Torvalds if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 8131da177e4SLinus Torvalds err = -EINVAL; 8141da177e4SLinus Torvalds goto exit_f; 8151da177e4SLinus Torvalds } 8161da177e4SLinus Torvalds 8171da177e4SLinus Torvalds *hlimit = *(int *)CMSG_DATA(cmsg); 818e8766fc8SShan Wei if (*hlimit < -1 || *hlimit > 0xff) { 819e8766fc8SShan Wei err = -EINVAL; 820e8766fc8SShan Wei goto exit_f; 821e8766fc8SShan Wei } 822e8766fc8SShan Wei 8231da177e4SLinus Torvalds break; 8241da177e4SLinus Torvalds 82541a1f8eaSYOSHIFUJI Hideaki case IPV6_TCLASS: 82641a1f8eaSYOSHIFUJI Hideaki { 82741a1f8eaSYOSHIFUJI Hideaki int tc; 82841a1f8eaSYOSHIFUJI Hideaki 82941a1f8eaSYOSHIFUJI Hideaki err = -EINVAL; 83041a1f8eaSYOSHIFUJI Hideaki if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 83141a1f8eaSYOSHIFUJI Hideaki goto exit_f; 83241a1f8eaSYOSHIFUJI Hideaki } 83341a1f8eaSYOSHIFUJI Hideaki 83441a1f8eaSYOSHIFUJI Hideaki tc = *(int *)CMSG_DATA(cmsg); 835d0ee011fSRemi Denis-Courmont if (tc < -1 || tc > 0xff) 83641a1f8eaSYOSHIFUJI Hideaki goto exit_f; 83741a1f8eaSYOSHIFUJI Hideaki 83841a1f8eaSYOSHIFUJI Hideaki err = 0; 83941a1f8eaSYOSHIFUJI Hideaki *tclass = tc; 84041a1f8eaSYOSHIFUJI Hideaki 84141a1f8eaSYOSHIFUJI Hideaki break; 84241a1f8eaSYOSHIFUJI Hideaki } 84313b52cd4SBrian Haley 84413b52cd4SBrian Haley case IPV6_DONTFRAG: 84513b52cd4SBrian Haley { 84613b52cd4SBrian Haley int df; 84713b52cd4SBrian Haley 84813b52cd4SBrian Haley err = -EINVAL; 84913b52cd4SBrian Haley if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 85013b52cd4SBrian Haley goto exit_f; 85113b52cd4SBrian Haley } 85213b52cd4SBrian Haley 85313b52cd4SBrian Haley df = *(int *)CMSG_DATA(cmsg); 85413b52cd4SBrian Haley if (df < 0 || df > 1) 85513b52cd4SBrian Haley goto exit_f; 85613b52cd4SBrian Haley 85713b52cd4SBrian Haley err = 0; 85813b52cd4SBrian Haley *dontfrag = df; 85913b52cd4SBrian Haley 86013b52cd4SBrian Haley break; 86113b52cd4SBrian Haley } 8621da177e4SLinus Torvalds default: 86364ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n", 86464ce2073SPatrick McHardy cmsg->cmsg_type); 8651da177e4SLinus Torvalds err = -EINVAL; 8664a36702eSMiao Xie goto exit_f; 8673ff50b79SStephen Hemminger } 8681da177e4SLinus Torvalds } 8691da177e4SLinus Torvalds 8701da177e4SLinus Torvalds exit_f: 8711da177e4SLinus Torvalds return err; 8721da177e4SLinus Torvalds } 873