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 * $Id: datagram.c,v 1.24 2002/02/01 22:01:04 davem Exp $ 91da177e4SLinus Torvalds * 101da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or 111da177e4SLinus Torvalds * modify it under the terms of the GNU General Public License 121da177e4SLinus Torvalds * as published by the Free Software Foundation; either version 131da177e4SLinus Torvalds * 2 of the License, or (at your option) any later version. 141da177e4SLinus Torvalds */ 151da177e4SLinus Torvalds 164fc268d2SRandy Dunlap #include <linux/capability.h> 171da177e4SLinus Torvalds #include <linux/errno.h> 181da177e4SLinus Torvalds #include <linux/types.h> 191da177e4SLinus Torvalds #include <linux/kernel.h> 201da177e4SLinus Torvalds #include <linux/sched.h> 211da177e4SLinus Torvalds #include <linux/interrupt.h> 221da177e4SLinus Torvalds #include <linux/socket.h> 231da177e4SLinus Torvalds #include <linux/sockios.h> 241da177e4SLinus Torvalds #include <linux/in6.h> 251da177e4SLinus Torvalds #include <linux/ipv6.h> 261da177e4SLinus Torvalds #include <linux/route.h> 271da177e4SLinus Torvalds 281da177e4SLinus Torvalds #include <net/ipv6.h> 291da177e4SLinus Torvalds #include <net/ndisc.h> 301da177e4SLinus Torvalds #include <net/addrconf.h> 311da177e4SLinus Torvalds #include <net/transp_v6.h> 321da177e4SLinus Torvalds #include <net/ip6_route.h> 33c752f073SArnaldo Carvalho de Melo #include <net/tcp_states.h> 341da177e4SLinus Torvalds 351da177e4SLinus Torvalds #include <linux/errqueue.h> 361da177e4SLinus Torvalds #include <asm/uaccess.h> 371da177e4SLinus Torvalds 381da177e4SLinus Torvalds int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) 391da177e4SLinus Torvalds { 401da177e4SLinus Torvalds struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; 411da177e4SLinus Torvalds struct inet_sock *inet = inet_sk(sk); 421da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 431da177e4SLinus Torvalds struct in6_addr *daddr, *final_p = NULL, final; 441da177e4SLinus Torvalds struct dst_entry *dst; 451da177e4SLinus Torvalds struct flowi fl; 461da177e4SLinus Torvalds struct ip6_flowlabel *flowlabel = NULL; 471da177e4SLinus Torvalds int addr_type; 481da177e4SLinus Torvalds int err; 491da177e4SLinus Torvalds 501da177e4SLinus Torvalds if (usin->sin6_family == AF_INET) { 511da177e4SLinus Torvalds if (__ipv6_only_sock(sk)) 521da177e4SLinus Torvalds return -EAFNOSUPPORT; 531da177e4SLinus Torvalds err = ip4_datagram_connect(sk, uaddr, addr_len); 541da177e4SLinus Torvalds goto ipv4_connected; 551da177e4SLinus Torvalds } 561da177e4SLinus Torvalds 571da177e4SLinus Torvalds if (addr_len < SIN6_LEN_RFC2133) 581da177e4SLinus Torvalds return -EINVAL; 591da177e4SLinus Torvalds 601da177e4SLinus Torvalds if (usin->sin6_family != AF_INET6) 611da177e4SLinus Torvalds return -EAFNOSUPPORT; 621da177e4SLinus Torvalds 631da177e4SLinus Torvalds memset(&fl, 0, sizeof(fl)); 641da177e4SLinus Torvalds if (np->sndflow) { 651da177e4SLinus Torvalds fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; 661da177e4SLinus Torvalds if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { 671da177e4SLinus Torvalds flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 681da177e4SLinus Torvalds if (flowlabel == NULL) 691da177e4SLinus Torvalds return -EINVAL; 701da177e4SLinus Torvalds ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); 711da177e4SLinus Torvalds } 721da177e4SLinus Torvalds } 731da177e4SLinus Torvalds 741da177e4SLinus Torvalds addr_type = ipv6_addr_type(&usin->sin6_addr); 751da177e4SLinus Torvalds 761da177e4SLinus Torvalds if (addr_type == IPV6_ADDR_ANY) { 771da177e4SLinus Torvalds /* 781da177e4SLinus Torvalds * connect to self 791da177e4SLinus Torvalds */ 801da177e4SLinus Torvalds usin->sin6_addr.s6_addr[15] = 0x01; 811da177e4SLinus Torvalds } 821da177e4SLinus Torvalds 831da177e4SLinus Torvalds daddr = &usin->sin6_addr; 841da177e4SLinus Torvalds 851da177e4SLinus Torvalds if (addr_type == IPV6_ADDR_MAPPED) { 861da177e4SLinus Torvalds struct sockaddr_in sin; 871da177e4SLinus Torvalds 881da177e4SLinus Torvalds if (__ipv6_only_sock(sk)) { 891da177e4SLinus Torvalds err = -ENETUNREACH; 901da177e4SLinus Torvalds goto out; 911da177e4SLinus Torvalds } 921da177e4SLinus Torvalds sin.sin_family = AF_INET; 931da177e4SLinus Torvalds sin.sin_addr.s_addr = daddr->s6_addr32[3]; 941da177e4SLinus Torvalds sin.sin_port = usin->sin6_port; 951da177e4SLinus Torvalds 961da177e4SLinus Torvalds err = ip4_datagram_connect(sk, 971da177e4SLinus Torvalds (struct sockaddr*) &sin, 981da177e4SLinus Torvalds sizeof(sin)); 991da177e4SLinus Torvalds 1001da177e4SLinus Torvalds ipv4_connected: 1011da177e4SLinus Torvalds if (err) 1021da177e4SLinus Torvalds goto out; 1031da177e4SLinus Torvalds 1041da177e4SLinus Torvalds ipv6_addr_set(&np->daddr, 0, 0, htonl(0x0000ffff), inet->daddr); 1051da177e4SLinus Torvalds 1061da177e4SLinus Torvalds if (ipv6_addr_any(&np->saddr)) { 1071da177e4SLinus Torvalds ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000ffff), 1081da177e4SLinus Torvalds inet->saddr); 1091da177e4SLinus Torvalds } 1101da177e4SLinus Torvalds 1111da177e4SLinus Torvalds if (ipv6_addr_any(&np->rcv_saddr)) { 1121da177e4SLinus Torvalds ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000ffff), 1131da177e4SLinus Torvalds inet->rcv_saddr); 1141da177e4SLinus Torvalds } 1151da177e4SLinus Torvalds goto out; 1161da177e4SLinus Torvalds } 1171da177e4SLinus Torvalds 1181da177e4SLinus Torvalds if (addr_type&IPV6_ADDR_LINKLOCAL) { 1191da177e4SLinus Torvalds if (addr_len >= sizeof(struct sockaddr_in6) && 1201da177e4SLinus Torvalds usin->sin6_scope_id) { 1211da177e4SLinus Torvalds if (sk->sk_bound_dev_if && 1221da177e4SLinus Torvalds sk->sk_bound_dev_if != usin->sin6_scope_id) { 1231da177e4SLinus Torvalds err = -EINVAL; 1241da177e4SLinus Torvalds goto out; 1251da177e4SLinus Torvalds } 1261da177e4SLinus Torvalds sk->sk_bound_dev_if = usin->sin6_scope_id; 1271da177e4SLinus Torvalds if (!sk->sk_bound_dev_if && 1281da177e4SLinus Torvalds (addr_type & IPV6_ADDR_MULTICAST)) 1291da177e4SLinus Torvalds fl.oif = np->mcast_oif; 1301da177e4SLinus Torvalds } 1311da177e4SLinus Torvalds 1321da177e4SLinus Torvalds /* Connect to link-local address requires an interface */ 1331da177e4SLinus Torvalds if (!sk->sk_bound_dev_if) { 1341da177e4SLinus Torvalds err = -EINVAL; 1351da177e4SLinus Torvalds goto out; 1361da177e4SLinus Torvalds } 1371da177e4SLinus Torvalds } 1381da177e4SLinus Torvalds 1391da177e4SLinus Torvalds ipv6_addr_copy(&np->daddr, daddr); 1401da177e4SLinus Torvalds np->flow_label = fl.fl6_flowlabel; 1411da177e4SLinus Torvalds 1421da177e4SLinus Torvalds inet->dport = usin->sin6_port; 1431da177e4SLinus Torvalds 1441da177e4SLinus Torvalds /* 1451da177e4SLinus Torvalds * Check for a route to destination an obtain the 1461da177e4SLinus Torvalds * destination cache for it. 1471da177e4SLinus Torvalds */ 1481da177e4SLinus Torvalds 1491da177e4SLinus Torvalds fl.proto = sk->sk_protocol; 1501da177e4SLinus Torvalds ipv6_addr_copy(&fl.fl6_dst, &np->daddr); 1511da177e4SLinus Torvalds ipv6_addr_copy(&fl.fl6_src, &np->saddr); 1521da177e4SLinus Torvalds fl.oif = sk->sk_bound_dev_if; 1531da177e4SLinus Torvalds fl.fl_ip_dport = inet->dport; 1541da177e4SLinus Torvalds fl.fl_ip_sport = inet->sport; 1551da177e4SLinus Torvalds 1561da177e4SLinus Torvalds if (!fl.oif && (addr_type&IPV6_ADDR_MULTICAST)) 1571da177e4SLinus Torvalds fl.oif = np->mcast_oif; 1581da177e4SLinus Torvalds 1591da177e4SLinus Torvalds if (flowlabel) { 1601da177e4SLinus Torvalds if (flowlabel->opt && flowlabel->opt->srcrt) { 1611da177e4SLinus Torvalds struct rt0_hdr *rt0 = (struct rt0_hdr *) flowlabel->opt->srcrt; 1621da177e4SLinus Torvalds ipv6_addr_copy(&final, &fl.fl6_dst); 1631da177e4SLinus Torvalds ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 1641da177e4SLinus Torvalds final_p = &final; 1651da177e4SLinus Torvalds } 1661da177e4SLinus Torvalds } else if (np->opt && np->opt->srcrt) { 1671da177e4SLinus Torvalds struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; 1681da177e4SLinus Torvalds ipv6_addr_copy(&final, &fl.fl6_dst); 1691da177e4SLinus Torvalds ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 1701da177e4SLinus Torvalds final_p = &final; 1711da177e4SLinus Torvalds } 1721da177e4SLinus Torvalds 1731da177e4SLinus Torvalds err = ip6_dst_lookup(sk, &dst, &fl); 1741da177e4SLinus Torvalds if (err) 1751da177e4SLinus Torvalds goto out; 1761da177e4SLinus Torvalds if (final_p) 1771da177e4SLinus Torvalds ipv6_addr_copy(&fl.fl6_dst, final_p); 1781da177e4SLinus Torvalds 179e104411bSPatrick McHardy if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) 1801da177e4SLinus Torvalds goto out; 1811da177e4SLinus Torvalds 1821da177e4SLinus Torvalds /* source address lookup done in ip6_dst_lookup */ 1831da177e4SLinus Torvalds 1841da177e4SLinus Torvalds if (ipv6_addr_any(&np->saddr)) 1851da177e4SLinus Torvalds ipv6_addr_copy(&np->saddr, &fl.fl6_src); 1861da177e4SLinus Torvalds 1871da177e4SLinus Torvalds if (ipv6_addr_any(&np->rcv_saddr)) { 1881da177e4SLinus Torvalds ipv6_addr_copy(&np->rcv_saddr, &fl.fl6_src); 1891da177e4SLinus Torvalds inet->rcv_saddr = LOOPBACK4_IPV6; 1901da177e4SLinus Torvalds } 1911da177e4SLinus Torvalds 1921da177e4SLinus Torvalds ip6_dst_store(sk, dst, 1931da177e4SLinus Torvalds ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ? 1941da177e4SLinus Torvalds &np->daddr : NULL); 1951da177e4SLinus Torvalds 1961da177e4SLinus Torvalds sk->sk_state = TCP_ESTABLISHED; 1971da177e4SLinus Torvalds out: 1981da177e4SLinus Torvalds fl6_sock_release(flowlabel); 1991da177e4SLinus Torvalds return err; 2001da177e4SLinus Torvalds } 2011da177e4SLinus Torvalds 2021da177e4SLinus Torvalds void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 2031da177e4SLinus Torvalds u16 port, u32 info, u8 *payload) 2041da177e4SLinus Torvalds { 2051da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 2061da177e4SLinus Torvalds struct icmp6hdr *icmph = (struct icmp6hdr *)skb->h.raw; 2071da177e4SLinus Torvalds struct sock_exterr_skb *serr; 2081da177e4SLinus Torvalds 2091da177e4SLinus Torvalds if (!np->recverr) 2101da177e4SLinus Torvalds return; 2111da177e4SLinus Torvalds 2121da177e4SLinus Torvalds skb = skb_clone(skb, GFP_ATOMIC); 2131da177e4SLinus Torvalds if (!skb) 2141da177e4SLinus Torvalds return; 2151da177e4SLinus Torvalds 2161da177e4SLinus Torvalds serr = SKB_EXT_ERR(skb); 2171da177e4SLinus Torvalds serr->ee.ee_errno = err; 2181da177e4SLinus Torvalds serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6; 2191da177e4SLinus Torvalds serr->ee.ee_type = icmph->icmp6_type; 2201da177e4SLinus Torvalds serr->ee.ee_code = icmph->icmp6_code; 2211da177e4SLinus Torvalds serr->ee.ee_pad = 0; 2221da177e4SLinus Torvalds serr->ee.ee_info = info; 2231da177e4SLinus Torvalds serr->ee.ee_data = 0; 2241da177e4SLinus Torvalds serr->addr_offset = (u8*)&(((struct ipv6hdr*)(icmph+1))->daddr) - skb->nh.raw; 2251da177e4SLinus Torvalds serr->port = port; 2261da177e4SLinus Torvalds 2271da177e4SLinus Torvalds skb->h.raw = payload; 2281da177e4SLinus Torvalds __skb_pull(skb, payload - skb->data); 2291da177e4SLinus Torvalds 2301da177e4SLinus Torvalds if (sock_queue_err_skb(sk, skb)) 2311da177e4SLinus Torvalds kfree_skb(skb); 2321da177e4SLinus Torvalds } 2331da177e4SLinus Torvalds 2341da177e4SLinus Torvalds void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info) 2351da177e4SLinus Torvalds { 2361da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 2371da177e4SLinus Torvalds struct sock_exterr_skb *serr; 2381da177e4SLinus Torvalds struct ipv6hdr *iph; 2391da177e4SLinus Torvalds struct sk_buff *skb; 2401da177e4SLinus Torvalds 2411da177e4SLinus Torvalds if (!np->recverr) 2421da177e4SLinus Torvalds return; 2431da177e4SLinus Torvalds 2441da177e4SLinus Torvalds skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 2451da177e4SLinus Torvalds if (!skb) 2461da177e4SLinus Torvalds return; 2471da177e4SLinus Torvalds 2481da177e4SLinus Torvalds iph = (struct ipv6hdr*)skb_put(skb, sizeof(struct ipv6hdr)); 2491da177e4SLinus Torvalds skb->nh.ipv6h = iph; 2501da177e4SLinus Torvalds ipv6_addr_copy(&iph->daddr, &fl->fl6_dst); 2511da177e4SLinus Torvalds 2521da177e4SLinus Torvalds serr = SKB_EXT_ERR(skb); 2531da177e4SLinus Torvalds serr->ee.ee_errno = err; 2541da177e4SLinus Torvalds serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 2551da177e4SLinus Torvalds serr->ee.ee_type = 0; 2561da177e4SLinus Torvalds serr->ee.ee_code = 0; 2571da177e4SLinus Torvalds serr->ee.ee_pad = 0; 2581da177e4SLinus Torvalds serr->ee.ee_info = info; 2591da177e4SLinus Torvalds serr->ee.ee_data = 0; 2601da177e4SLinus Torvalds serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw; 2611da177e4SLinus Torvalds serr->port = fl->fl_ip_dport; 2621da177e4SLinus Torvalds 2631da177e4SLinus Torvalds skb->h.raw = skb->tail; 2641da177e4SLinus Torvalds __skb_pull(skb, skb->tail - skb->data); 2651da177e4SLinus Torvalds 2661da177e4SLinus Torvalds if (sock_queue_err_skb(sk, skb)) 2671da177e4SLinus Torvalds kfree_skb(skb); 2681da177e4SLinus Torvalds } 2691da177e4SLinus Torvalds 2701da177e4SLinus Torvalds /* 2711da177e4SLinus Torvalds * Handle MSG_ERRQUEUE 2721da177e4SLinus Torvalds */ 2731da177e4SLinus Torvalds int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len) 2741da177e4SLinus Torvalds { 2751da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 2761da177e4SLinus Torvalds struct sock_exterr_skb *serr; 2771da177e4SLinus Torvalds struct sk_buff *skb, *skb2; 2781da177e4SLinus Torvalds struct sockaddr_in6 *sin; 2791da177e4SLinus Torvalds struct { 2801da177e4SLinus Torvalds struct sock_extended_err ee; 2811da177e4SLinus Torvalds struct sockaddr_in6 offender; 2821da177e4SLinus Torvalds } errhdr; 2831da177e4SLinus Torvalds int err; 2841da177e4SLinus Torvalds int copied; 2851da177e4SLinus Torvalds 2861da177e4SLinus Torvalds err = -EAGAIN; 2871da177e4SLinus Torvalds skb = skb_dequeue(&sk->sk_error_queue); 2881da177e4SLinus Torvalds if (skb == NULL) 2891da177e4SLinus Torvalds goto out; 2901da177e4SLinus Torvalds 2911da177e4SLinus Torvalds copied = skb->len; 2921da177e4SLinus Torvalds if (copied > len) { 2931da177e4SLinus Torvalds msg->msg_flags |= MSG_TRUNC; 2941da177e4SLinus Torvalds copied = len; 2951da177e4SLinus Torvalds } 2961da177e4SLinus Torvalds err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 2971da177e4SLinus Torvalds if (err) 2981da177e4SLinus Torvalds goto out_free_skb; 2991da177e4SLinus Torvalds 3001da177e4SLinus Torvalds sock_recv_timestamp(msg, sk, skb); 3011da177e4SLinus Torvalds 3021da177e4SLinus Torvalds serr = SKB_EXT_ERR(skb); 3031da177e4SLinus Torvalds 3041da177e4SLinus Torvalds sin = (struct sockaddr_in6 *)msg->msg_name; 3051da177e4SLinus Torvalds if (sin) { 3061da177e4SLinus Torvalds sin->sin6_family = AF_INET6; 3071da177e4SLinus Torvalds sin->sin6_flowinfo = 0; 3081da177e4SLinus Torvalds sin->sin6_port = serr->port; 3091da177e4SLinus Torvalds sin->sin6_scope_id = 0; 3101da177e4SLinus Torvalds if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) { 3111da177e4SLinus Torvalds ipv6_addr_copy(&sin->sin6_addr, 3121da177e4SLinus Torvalds (struct in6_addr *)(skb->nh.raw + serr->addr_offset)); 3131da177e4SLinus Torvalds if (np->sndflow) 3141da177e4SLinus Torvalds sin->sin6_flowinfo = *(u32*)(skb->nh.raw + serr->addr_offset - 24) & IPV6_FLOWINFO_MASK; 3151da177e4SLinus Torvalds if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 3161da177e4SLinus Torvalds sin->sin6_scope_id = IP6CB(skb)->iif; 3171da177e4SLinus Torvalds } else { 3181da177e4SLinus Torvalds ipv6_addr_set(&sin->sin6_addr, 0, 0, 3191da177e4SLinus Torvalds htonl(0xffff), 3201da177e4SLinus Torvalds *(u32*)(skb->nh.raw + serr->addr_offset)); 3211da177e4SLinus Torvalds } 3221da177e4SLinus Torvalds } 3231da177e4SLinus Torvalds 3241da177e4SLinus Torvalds memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 3251da177e4SLinus Torvalds sin = &errhdr.offender; 3261da177e4SLinus Torvalds sin->sin6_family = AF_UNSPEC; 3271da177e4SLinus Torvalds if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) { 3281da177e4SLinus Torvalds sin->sin6_family = AF_INET6; 3291da177e4SLinus Torvalds sin->sin6_flowinfo = 0; 3301da177e4SLinus Torvalds sin->sin6_scope_id = 0; 3311da177e4SLinus Torvalds if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) { 3321da177e4SLinus Torvalds ipv6_addr_copy(&sin->sin6_addr, &skb->nh.ipv6h->saddr); 3331da177e4SLinus Torvalds if (np->rxopt.all) 3341da177e4SLinus Torvalds datagram_recv_ctl(sk, msg, skb); 3351da177e4SLinus Torvalds if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 3361da177e4SLinus Torvalds sin->sin6_scope_id = IP6CB(skb)->iif; 3371da177e4SLinus Torvalds } else { 3381da177e4SLinus Torvalds struct inet_sock *inet = inet_sk(sk); 3391da177e4SLinus Torvalds 3401da177e4SLinus Torvalds ipv6_addr_set(&sin->sin6_addr, 0, 0, 3411da177e4SLinus Torvalds htonl(0xffff), 3421da177e4SLinus Torvalds skb->nh.iph->saddr); 3431da177e4SLinus Torvalds if (inet->cmsg_flags) 3441da177e4SLinus Torvalds ip_cmsg_recv(msg, skb); 3451da177e4SLinus Torvalds } 3461da177e4SLinus Torvalds } 3471da177e4SLinus Torvalds 3481da177e4SLinus Torvalds put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr); 3491da177e4SLinus Torvalds 3501da177e4SLinus Torvalds /* Now we could try to dump offended packet options */ 3511da177e4SLinus Torvalds 3521da177e4SLinus Torvalds msg->msg_flags |= MSG_ERRQUEUE; 3531da177e4SLinus Torvalds err = copied; 3541da177e4SLinus Torvalds 3551da177e4SLinus Torvalds /* Reset and regenerate socket error */ 356e0f9f858SHerbert Xu spin_lock_bh(&sk->sk_error_queue.lock); 3571da177e4SLinus Torvalds sk->sk_err = 0; 3581da177e4SLinus Torvalds if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) { 3591da177e4SLinus Torvalds sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; 360e0f9f858SHerbert Xu spin_unlock_bh(&sk->sk_error_queue.lock); 3611da177e4SLinus Torvalds sk->sk_error_report(sk); 3621da177e4SLinus Torvalds } else { 363e0f9f858SHerbert Xu spin_unlock_bh(&sk->sk_error_queue.lock); 3641da177e4SLinus Torvalds } 3651da177e4SLinus Torvalds 3661da177e4SLinus Torvalds out_free_skb: 3671da177e4SLinus Torvalds kfree_skb(skb); 3681da177e4SLinus Torvalds out: 3691da177e4SLinus Torvalds return err; 3701da177e4SLinus Torvalds } 3711da177e4SLinus Torvalds 3721da177e4SLinus Torvalds 3731da177e4SLinus Torvalds 3741da177e4SLinus Torvalds int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb) 3751da177e4SLinus Torvalds { 3761da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 3771da177e4SLinus Torvalds struct inet6_skb_parm *opt = IP6CB(skb); 3781da177e4SLinus Torvalds 3791da177e4SLinus Torvalds if (np->rxopt.bits.rxinfo) { 3801da177e4SLinus Torvalds struct in6_pktinfo src_info; 3811da177e4SLinus Torvalds 3821da177e4SLinus Torvalds src_info.ipi6_ifindex = opt->iif; 3831da177e4SLinus Torvalds ipv6_addr_copy(&src_info.ipi6_addr, &skb->nh.ipv6h->daddr); 3841da177e4SLinus Torvalds put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 3851da177e4SLinus Torvalds } 3861da177e4SLinus Torvalds 3871da177e4SLinus Torvalds if (np->rxopt.bits.rxhlim) { 3881da177e4SLinus Torvalds int hlim = skb->nh.ipv6h->hop_limit; 3891da177e4SLinus Torvalds put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 3901da177e4SLinus Torvalds } 3911da177e4SLinus Torvalds 39241a1f8eaSYOSHIFUJI Hideaki if (np->rxopt.bits.rxtclass) { 39341a1f8eaSYOSHIFUJI Hideaki int tclass = (ntohl(*(u32 *)skb->nh.ipv6h) >> 20) & 0xff; 39441a1f8eaSYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 39541a1f8eaSYOSHIFUJI Hideaki } 39641a1f8eaSYOSHIFUJI Hideaki 3971da177e4SLinus Torvalds if (np->rxopt.bits.rxflow && (*(u32*)skb->nh.raw & IPV6_FLOWINFO_MASK)) { 3981da177e4SLinus Torvalds u32 flowinfo = *(u32*)skb->nh.raw & IPV6_FLOWINFO_MASK; 3991da177e4SLinus Torvalds put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 4001da177e4SLinus Torvalds } 401333fad53SYOSHIFUJI Hideaki 402333fad53SYOSHIFUJI Hideaki /* HbH is allowed only once */ 4031da177e4SLinus Torvalds if (np->rxopt.bits.hopopts && opt->hop) { 4041da177e4SLinus Torvalds u8 *ptr = skb->nh.raw + opt->hop; 4051da177e4SLinus Torvalds put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); 4061da177e4SLinus Torvalds } 407333fad53SYOSHIFUJI Hideaki 408333fad53SYOSHIFUJI Hideaki if (opt->lastopt && 409333fad53SYOSHIFUJI Hideaki (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { 410333fad53SYOSHIFUJI Hideaki /* 411333fad53SYOSHIFUJI Hideaki * Silly enough, but we need to reparse in order to 412333fad53SYOSHIFUJI Hideaki * report extension headers (except for HbH) 413333fad53SYOSHIFUJI Hideaki * in order. 414333fad53SYOSHIFUJI Hideaki * 415333fad53SYOSHIFUJI Hideaki * Also note that IPV6_RECVRTHDRDSTOPTS is NOT 416333fad53SYOSHIFUJI Hideaki * (and WILL NOT be) defined because 417333fad53SYOSHIFUJI Hideaki * IPV6_RECVDSTOPTS is more generic. --yoshfuji 418333fad53SYOSHIFUJI Hideaki */ 419333fad53SYOSHIFUJI Hideaki unsigned int off = sizeof(struct ipv6hdr); 420333fad53SYOSHIFUJI Hideaki u8 nexthdr = skb->nh.ipv6h->nexthdr; 421333fad53SYOSHIFUJI Hideaki 422333fad53SYOSHIFUJI Hideaki while (off <= opt->lastopt) { 423333fad53SYOSHIFUJI Hideaki unsigned len; 424333fad53SYOSHIFUJI Hideaki u8 *ptr = skb->nh.raw + off; 425333fad53SYOSHIFUJI Hideaki 426333fad53SYOSHIFUJI Hideaki switch(nexthdr) { 427333fad53SYOSHIFUJI Hideaki case IPPROTO_DSTOPTS: 428333fad53SYOSHIFUJI Hideaki nexthdr = ptr[0]; 429333fad53SYOSHIFUJI Hideaki len = (ptr[1] + 1) << 3; 430333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.dstopts) 431333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr); 432333fad53SYOSHIFUJI Hideaki break; 433333fad53SYOSHIFUJI Hideaki case IPPROTO_ROUTING: 434333fad53SYOSHIFUJI Hideaki nexthdr = ptr[0]; 435333fad53SYOSHIFUJI Hideaki len = (ptr[1] + 1) << 3; 436333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.srcrt) 437333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr); 438333fad53SYOSHIFUJI Hideaki break; 439333fad53SYOSHIFUJI Hideaki case IPPROTO_AH: 440333fad53SYOSHIFUJI Hideaki nexthdr = ptr[0]; 441a3059893SVille Nuorvala len = (ptr[1] + 2) << 2; 442333fad53SYOSHIFUJI Hideaki break; 443333fad53SYOSHIFUJI Hideaki default: 444333fad53SYOSHIFUJI Hideaki nexthdr = ptr[0]; 445333fad53SYOSHIFUJI Hideaki len = (ptr[1] + 1) << 3; 446333fad53SYOSHIFUJI Hideaki break; 447333fad53SYOSHIFUJI Hideaki } 448333fad53SYOSHIFUJI Hideaki 449333fad53SYOSHIFUJI Hideaki off += len; 450333fad53SYOSHIFUJI Hideaki } 451333fad53SYOSHIFUJI Hideaki } 452333fad53SYOSHIFUJI Hideaki 453333fad53SYOSHIFUJI Hideaki /* socket options in old style */ 454333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.rxoinfo) { 455333fad53SYOSHIFUJI Hideaki struct in6_pktinfo src_info; 456333fad53SYOSHIFUJI Hideaki 457333fad53SYOSHIFUJI Hideaki src_info.ipi6_ifindex = opt->iif; 458333fad53SYOSHIFUJI Hideaki ipv6_addr_copy(&src_info.ipi6_addr, &skb->nh.ipv6h->daddr); 459333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 460333fad53SYOSHIFUJI Hideaki } 461333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.rxohlim) { 462333fad53SYOSHIFUJI Hideaki int hlim = skb->nh.ipv6h->hop_limit; 463333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 464333fad53SYOSHIFUJI Hideaki } 465333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.ohopopts && opt->hop) { 466333fad53SYOSHIFUJI Hideaki u8 *ptr = skb->nh.raw + opt->hop; 467333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr); 468333fad53SYOSHIFUJI Hideaki } 469333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.odstopts && opt->dst0) { 4701da177e4SLinus Torvalds u8 *ptr = skb->nh.raw + opt->dst0; 471333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 4721da177e4SLinus Torvalds } 473333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.osrcrt && opt->srcrt) { 4741da177e4SLinus Torvalds struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(skb->nh.raw + opt->srcrt); 475333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr); 4761da177e4SLinus Torvalds } 477333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.odstopts && opt->dst1) { 4781da177e4SLinus Torvalds u8 *ptr = skb->nh.raw + opt->dst1; 479333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 4801da177e4SLinus Torvalds } 4811da177e4SLinus Torvalds return 0; 4821da177e4SLinus Torvalds } 4831da177e4SLinus Torvalds 4841da177e4SLinus Torvalds int datagram_send_ctl(struct msghdr *msg, struct flowi *fl, 4851da177e4SLinus Torvalds struct ipv6_txoptions *opt, 48641a1f8eaSYOSHIFUJI Hideaki int *hlimit, int *tclass) 4871da177e4SLinus Torvalds { 4881da177e4SLinus Torvalds struct in6_pktinfo *src_info; 4891da177e4SLinus Torvalds struct cmsghdr *cmsg; 4901da177e4SLinus Torvalds struct ipv6_rt_hdr *rthdr; 4911da177e4SLinus Torvalds struct ipv6_opt_hdr *hdr; 4921da177e4SLinus Torvalds int len; 4931da177e4SLinus Torvalds int err = 0; 4941da177e4SLinus Torvalds 4951da177e4SLinus Torvalds for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { 4961da177e4SLinus Torvalds int addr_type; 4971da177e4SLinus Torvalds struct net_device *dev = NULL; 4981da177e4SLinus Torvalds 4991da177e4SLinus Torvalds if (!CMSG_OK(msg, cmsg)) { 5001da177e4SLinus Torvalds err = -EINVAL; 5011da177e4SLinus Torvalds goto exit_f; 5021da177e4SLinus Torvalds } 5031da177e4SLinus Torvalds 5041da177e4SLinus Torvalds if (cmsg->cmsg_level != SOL_IPV6) 5051da177e4SLinus Torvalds continue; 5061da177e4SLinus Torvalds 5071da177e4SLinus Torvalds switch (cmsg->cmsg_type) { 5081da177e4SLinus Torvalds case IPV6_PKTINFO: 509333fad53SYOSHIFUJI Hideaki case IPV6_2292PKTINFO: 5101da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { 5111da177e4SLinus Torvalds err = -EINVAL; 5121da177e4SLinus Torvalds goto exit_f; 5131da177e4SLinus Torvalds } 5141da177e4SLinus Torvalds 5151da177e4SLinus Torvalds src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); 5161da177e4SLinus Torvalds 5171da177e4SLinus Torvalds if (src_info->ipi6_ifindex) { 5181da177e4SLinus Torvalds if (fl->oif && src_info->ipi6_ifindex != fl->oif) 5191da177e4SLinus Torvalds return -EINVAL; 5201da177e4SLinus Torvalds fl->oif = src_info->ipi6_ifindex; 5211da177e4SLinus Torvalds } 5221da177e4SLinus Torvalds 5231da177e4SLinus Torvalds addr_type = ipv6_addr_type(&src_info->ipi6_addr); 5241da177e4SLinus Torvalds 5251da177e4SLinus Torvalds if (addr_type == IPV6_ADDR_ANY) 5261da177e4SLinus Torvalds break; 5271da177e4SLinus Torvalds 5281da177e4SLinus Torvalds if (addr_type & IPV6_ADDR_LINKLOCAL) { 5291da177e4SLinus Torvalds if (!src_info->ipi6_ifindex) 5301da177e4SLinus Torvalds return -EINVAL; 5311da177e4SLinus Torvalds else { 5321da177e4SLinus Torvalds dev = dev_get_by_index(src_info->ipi6_ifindex); 5331da177e4SLinus Torvalds if (!dev) 5341da177e4SLinus Torvalds return -ENODEV; 5351da177e4SLinus Torvalds } 5361da177e4SLinus Torvalds } 5371da177e4SLinus Torvalds if (!ipv6_chk_addr(&src_info->ipi6_addr, dev, 0)) { 5381da177e4SLinus Torvalds if (dev) 5391da177e4SLinus Torvalds dev_put(dev); 5401da177e4SLinus Torvalds err = -EINVAL; 5411da177e4SLinus Torvalds goto exit_f; 5421da177e4SLinus Torvalds } 5431da177e4SLinus Torvalds if (dev) 5441da177e4SLinus Torvalds dev_put(dev); 5451da177e4SLinus Torvalds 5461da177e4SLinus Torvalds ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr); 5471da177e4SLinus Torvalds break; 5481da177e4SLinus Torvalds 5491da177e4SLinus Torvalds case IPV6_FLOWINFO: 5501da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(4)) { 5511da177e4SLinus Torvalds err = -EINVAL; 5521da177e4SLinus Torvalds goto exit_f; 5531da177e4SLinus Torvalds } 5541da177e4SLinus Torvalds 5551da177e4SLinus Torvalds if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) { 5561da177e4SLinus Torvalds if ((fl->fl6_flowlabel^*(u32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { 5571da177e4SLinus Torvalds err = -EINVAL; 5581da177e4SLinus Torvalds goto exit_f; 5591da177e4SLinus Torvalds } 5601da177e4SLinus Torvalds } 5611da177e4SLinus Torvalds fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(u32 *)CMSG_DATA(cmsg); 5621da177e4SLinus Torvalds break; 5631da177e4SLinus Torvalds 564333fad53SYOSHIFUJI Hideaki case IPV6_2292HOPOPTS: 5651da177e4SLinus Torvalds case IPV6_HOPOPTS: 5661da177e4SLinus Torvalds if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 5671da177e4SLinus Torvalds err = -EINVAL; 5681da177e4SLinus Torvalds goto exit_f; 5691da177e4SLinus Torvalds } 5701da177e4SLinus Torvalds 5711da177e4SLinus Torvalds hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 5721da177e4SLinus Torvalds len = ((hdr->hdrlen + 1) << 3); 5731da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(len)) { 5741da177e4SLinus Torvalds err = -EINVAL; 5751da177e4SLinus Torvalds goto exit_f; 5761da177e4SLinus Torvalds } 5771da177e4SLinus Torvalds if (!capable(CAP_NET_RAW)) { 5781da177e4SLinus Torvalds err = -EPERM; 5791da177e4SLinus Torvalds goto exit_f; 5801da177e4SLinus Torvalds } 5811da177e4SLinus Torvalds opt->opt_nflen += len; 5821da177e4SLinus Torvalds opt->hopopt = hdr; 5831da177e4SLinus Torvalds break; 5841da177e4SLinus Torvalds 585333fad53SYOSHIFUJI Hideaki case IPV6_2292DSTOPTS: 5861da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 5871da177e4SLinus Torvalds err = -EINVAL; 5881da177e4SLinus Torvalds goto exit_f; 5891da177e4SLinus Torvalds } 5901da177e4SLinus Torvalds 5911da177e4SLinus Torvalds hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 5921da177e4SLinus Torvalds len = ((hdr->hdrlen + 1) << 3); 5931da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(len)) { 5941da177e4SLinus Torvalds err = -EINVAL; 5951da177e4SLinus Torvalds goto exit_f; 5961da177e4SLinus Torvalds } 5971da177e4SLinus Torvalds if (!capable(CAP_NET_RAW)) { 5981da177e4SLinus Torvalds err = -EPERM; 5991da177e4SLinus Torvalds goto exit_f; 6001da177e4SLinus Torvalds } 6011da177e4SLinus Torvalds if (opt->dst1opt) { 6021da177e4SLinus Torvalds err = -EINVAL; 6031da177e4SLinus Torvalds goto exit_f; 6041da177e4SLinus Torvalds } 6051da177e4SLinus Torvalds opt->opt_flen += len; 6061da177e4SLinus Torvalds opt->dst1opt = hdr; 6071da177e4SLinus Torvalds break; 6081da177e4SLinus Torvalds 609333fad53SYOSHIFUJI Hideaki case IPV6_DSTOPTS: 610333fad53SYOSHIFUJI Hideaki case IPV6_RTHDRDSTOPTS: 611333fad53SYOSHIFUJI Hideaki if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 612333fad53SYOSHIFUJI Hideaki err = -EINVAL; 613333fad53SYOSHIFUJI Hideaki goto exit_f; 614333fad53SYOSHIFUJI Hideaki } 615333fad53SYOSHIFUJI Hideaki 616333fad53SYOSHIFUJI Hideaki hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 617333fad53SYOSHIFUJI Hideaki len = ((hdr->hdrlen + 1) << 3); 618333fad53SYOSHIFUJI Hideaki if (cmsg->cmsg_len < CMSG_LEN(len)) { 619333fad53SYOSHIFUJI Hideaki err = -EINVAL; 620333fad53SYOSHIFUJI Hideaki goto exit_f; 621333fad53SYOSHIFUJI Hideaki } 622333fad53SYOSHIFUJI Hideaki if (!capable(CAP_NET_RAW)) { 623333fad53SYOSHIFUJI Hideaki err = -EPERM; 624333fad53SYOSHIFUJI Hideaki goto exit_f; 625333fad53SYOSHIFUJI Hideaki } 626333fad53SYOSHIFUJI Hideaki if (cmsg->cmsg_type == IPV6_DSTOPTS) { 627333fad53SYOSHIFUJI Hideaki opt->opt_flen += len; 628333fad53SYOSHIFUJI Hideaki opt->dst1opt = hdr; 629333fad53SYOSHIFUJI Hideaki } else { 630333fad53SYOSHIFUJI Hideaki opt->opt_nflen += len; 631333fad53SYOSHIFUJI Hideaki opt->dst0opt = hdr; 632333fad53SYOSHIFUJI Hideaki } 633333fad53SYOSHIFUJI Hideaki break; 634333fad53SYOSHIFUJI Hideaki 635333fad53SYOSHIFUJI Hideaki case IPV6_2292RTHDR: 6361da177e4SLinus Torvalds case IPV6_RTHDR: 6371da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { 6381da177e4SLinus Torvalds err = -EINVAL; 6391da177e4SLinus Torvalds goto exit_f; 6401da177e4SLinus Torvalds } 6411da177e4SLinus Torvalds 6421da177e4SLinus Torvalds rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); 6431da177e4SLinus Torvalds 6441da177e4SLinus Torvalds /* 6451da177e4SLinus Torvalds * TYPE 0 6461da177e4SLinus Torvalds */ 6471da177e4SLinus Torvalds if (rthdr->type) { 6481da177e4SLinus Torvalds err = -EINVAL; 6491da177e4SLinus Torvalds goto exit_f; 6501da177e4SLinus Torvalds } 6511da177e4SLinus Torvalds 6521da177e4SLinus Torvalds len = ((rthdr->hdrlen + 1) << 3); 6531da177e4SLinus Torvalds 6541da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(len)) { 6551da177e4SLinus Torvalds err = -EINVAL; 6561da177e4SLinus Torvalds goto exit_f; 6571da177e4SLinus Torvalds } 6581da177e4SLinus Torvalds 6591da177e4SLinus Torvalds /* segments left must also match */ 6601da177e4SLinus Torvalds if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { 6611da177e4SLinus Torvalds err = -EINVAL; 6621da177e4SLinus Torvalds goto exit_f; 6631da177e4SLinus Torvalds } 6641da177e4SLinus Torvalds 6651da177e4SLinus Torvalds opt->opt_nflen += len; 6661da177e4SLinus Torvalds opt->srcrt = rthdr; 6671da177e4SLinus Torvalds 668333fad53SYOSHIFUJI Hideaki if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { 6691da177e4SLinus Torvalds int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); 6701da177e4SLinus Torvalds 6711da177e4SLinus Torvalds opt->opt_nflen += dsthdrlen; 6721da177e4SLinus Torvalds opt->dst0opt = opt->dst1opt; 6731da177e4SLinus Torvalds opt->dst1opt = NULL; 6741da177e4SLinus Torvalds opt->opt_flen -= dsthdrlen; 6751da177e4SLinus Torvalds } 6761da177e4SLinus Torvalds 6771da177e4SLinus Torvalds break; 6781da177e4SLinus Torvalds 679333fad53SYOSHIFUJI Hideaki case IPV6_2292HOPLIMIT: 6801da177e4SLinus Torvalds case IPV6_HOPLIMIT: 6811da177e4SLinus Torvalds if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 6821da177e4SLinus Torvalds err = -EINVAL; 6831da177e4SLinus Torvalds goto exit_f; 6841da177e4SLinus Torvalds } 6851da177e4SLinus Torvalds 6861da177e4SLinus Torvalds *hlimit = *(int *)CMSG_DATA(cmsg); 6871da177e4SLinus Torvalds break; 6881da177e4SLinus Torvalds 68941a1f8eaSYOSHIFUJI Hideaki case IPV6_TCLASS: 69041a1f8eaSYOSHIFUJI Hideaki { 69141a1f8eaSYOSHIFUJI Hideaki int tc; 69241a1f8eaSYOSHIFUJI Hideaki 69341a1f8eaSYOSHIFUJI Hideaki err = -EINVAL; 69441a1f8eaSYOSHIFUJI Hideaki if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 69541a1f8eaSYOSHIFUJI Hideaki goto exit_f; 69641a1f8eaSYOSHIFUJI Hideaki } 69741a1f8eaSYOSHIFUJI Hideaki 69841a1f8eaSYOSHIFUJI Hideaki tc = *(int *)CMSG_DATA(cmsg); 69941a1f8eaSYOSHIFUJI Hideaki if (tc < 0 || tc > 0xff) 70041a1f8eaSYOSHIFUJI Hideaki goto exit_f; 70141a1f8eaSYOSHIFUJI Hideaki 70241a1f8eaSYOSHIFUJI Hideaki err = 0; 70341a1f8eaSYOSHIFUJI Hideaki *tclass = tc; 70441a1f8eaSYOSHIFUJI Hideaki 70541a1f8eaSYOSHIFUJI Hideaki break; 70641a1f8eaSYOSHIFUJI Hideaki } 7071da177e4SLinus Torvalds default: 70864ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n", 70964ce2073SPatrick McHardy cmsg->cmsg_type); 7101da177e4SLinus Torvalds err = -EINVAL; 7111da177e4SLinus Torvalds break; 7121da177e4SLinus Torvalds }; 7131da177e4SLinus Torvalds } 7141da177e4SLinus Torvalds 7151da177e4SLinus Torvalds exit_f: 7161da177e4SLinus Torvalds return err; 7171da177e4SLinus Torvalds } 718