| /* |
| * common UDP/RAW code |
| * Linux INET6 implementation |
| * |
| * Authors: |
| * Pedro Roque <roque@di.fc.ul.pt> |
| * |
| * $Id: datagram.c,v 1.24 2002/02/01 22:01:04 davem Exp $ |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| |
| #include <linux/capability.h> |
| #include <linux/errno.h> |
| #include <linux/types.h> |
| #include <linux/kernel.h> |
| #include <linux/sched.h> |
| #include <linux/interrupt.h> |
| #include <linux/socket.h> |
| #include <linux/sockios.h> |
| #include <linux/in6.h> |
| #include <linux/ipv6.h> |
| #include <linux/route.h> |
| |
| #include <net/ipv6.h> |
| #include <net/ndisc.h> |
| #include <net/addrconf.h> |
| #include <net/transp_v6.h> |
| #include <net/ip6_route.h> |
| #include <net/tcp_states.h> |
| |
| #include <linux/errqueue.h> |
| #include <asm/uaccess.h> |
| |
| int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) |
| { |
| struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; |
| struct inet_sock *inet = inet_sk(sk); |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| struct in6_addr *daddr, *final_p = NULL, final; |
| struct dst_entry *dst; |
| struct flowi fl; |
| struct ip6_flowlabel *flowlabel = NULL; |
| int addr_type; |
| int err; |
| |
| if (usin->sin6_family == AF_INET) { |
| if (__ipv6_only_sock(sk)) |
| return -EAFNOSUPPORT; |
| err = ip4_datagram_connect(sk, uaddr, addr_len); |
| goto ipv4_connected; |
| } |
| |
| if (addr_len < SIN6_LEN_RFC2133) |
| return -EINVAL; |
| |
| if (usin->sin6_family != AF_INET6) |
| return -EAFNOSUPPORT; |
| |
| memset(&fl, 0, sizeof(fl)); |
| if (np->sndflow) { |
| fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
| if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { |
| flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); |
| if (flowlabel == NULL) |
| return -EINVAL; |
| ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); |
| } |
| } |
| |
| addr_type = ipv6_addr_type(&usin->sin6_addr); |
| |
| if (addr_type == IPV6_ADDR_ANY) { |
| /* |
| * connect to self |
| */ |
| usin->sin6_addr.s6_addr[15] = 0x01; |
| } |
| |
| daddr = &usin->sin6_addr; |
| |
| if (addr_type == IPV6_ADDR_MAPPED) { |
| struct sockaddr_in sin; |
| |
| if (__ipv6_only_sock(sk)) { |
| err = -ENETUNREACH; |
| goto out; |
| } |
| sin.sin_family = AF_INET; |
| sin.sin_addr.s_addr = daddr->s6_addr32[3]; |
| sin.sin_port = usin->sin6_port; |
| |
| err = ip4_datagram_connect(sk, |
| (struct sockaddr*) &sin, |
| sizeof(sin)); |
| |
| ipv4_connected: |
| if (err) |
| goto out; |
| |
| ipv6_addr_set(&np->daddr, 0, 0, htonl(0x0000ffff), inet->daddr); |
| |
| if (ipv6_addr_any(&np->saddr)) { |
| ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000ffff), |
| inet->saddr); |
| } |
| |
| if (ipv6_addr_any(&np->rcv_saddr)) { |
| ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000ffff), |
| inet->rcv_saddr); |
| } |
| goto out; |
| } |
| |
| if (addr_type&IPV6_ADDR_LINKLOCAL) { |
| if (addr_len >= sizeof(struct sockaddr_in6) && |
| usin->sin6_scope_id) { |
| if (sk->sk_bound_dev_if && |
| sk->sk_bound_dev_if != usin->sin6_scope_id) { |
| err = -EINVAL; |
| goto out; |
| } |
| sk->sk_bound_dev_if = usin->sin6_scope_id; |
| if (!sk->sk_bound_dev_if && |
| (addr_type & IPV6_ADDR_MULTICAST)) |
| fl.oif = np->mcast_oif; |
| } |
| |
| /* Connect to link-local address requires an interface */ |
| if (!sk->sk_bound_dev_if) { |
| err = -EINVAL; |
| goto out; |
| } |
| } |
| |
| ipv6_addr_copy(&np->daddr, daddr); |
| np->flow_label = fl.fl6_flowlabel; |
| |
| inet->dport = usin->sin6_port; |
| |
| /* |
| * Check for a route to destination an obtain the |
| * destination cache for it. |
| */ |
| |
| fl.proto = sk->sk_protocol; |
| ipv6_addr_copy(&fl.fl6_dst, &np->daddr); |
| ipv6_addr_copy(&fl.fl6_src, &np->saddr); |
| fl.oif = sk->sk_bound_dev_if; |
| fl.fl_ip_dport = inet->dport; |
| fl.fl_ip_sport = inet->sport; |
| |
| if (!fl.oif && (addr_type&IPV6_ADDR_MULTICAST)) |
| fl.oif = np->mcast_oif; |
| |
| security_sk_classify_flow(sk, &fl); |
| |
| if (flowlabel) { |
| if (flowlabel->opt && flowlabel->opt->srcrt) { |
| struct rt0_hdr *rt0 = (struct rt0_hdr *) flowlabel->opt->srcrt; |
| ipv6_addr_copy(&final, &fl.fl6_dst); |
| ipv6_addr_copy(&fl.fl6_dst, rt0->addr); |
| final_p = &final; |
| } |
| } else if (np->opt && np->opt->srcrt) { |
| struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; |
| ipv6_addr_copy(&final, &fl.fl6_dst); |
| ipv6_addr_copy(&fl.fl6_dst, rt0->addr); |
| final_p = &final; |
| } |
| |
| err = ip6_dst_lookup(sk, &dst, &fl); |
| if (err) |
| goto out; |
| if (final_p) |
| ipv6_addr_copy(&fl.fl6_dst, final_p); |
| |
| if ((err = xfrm_lookup(&dst, &fl, sk, 1)) < 0) |
| goto out; |
| |
| /* source address lookup done in ip6_dst_lookup */ |
| |
| if (ipv6_addr_any(&np->saddr)) |
| ipv6_addr_copy(&np->saddr, &fl.fl6_src); |
| |
| if (ipv6_addr_any(&np->rcv_saddr)) { |
| ipv6_addr_copy(&np->rcv_saddr, &fl.fl6_src); |
| inet->rcv_saddr = LOOPBACK4_IPV6; |
| } |
| |
| ip6_dst_store(sk, dst, |
| ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ? |
| &np->daddr : NULL, |
| #ifdef CONFIG_IPV6_SUBTREES |
| ipv6_addr_equal(&fl.fl6_src, &np->saddr) ? |
| &np->saddr : |
| #endif |
| NULL); |
| |
| sk->sk_state = TCP_ESTABLISHED; |
| out: |
| fl6_sock_release(flowlabel); |
| return err; |
| } |
| |
| void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, |
| __be16 port, u32 info, u8 *payload) |
| { |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| struct icmp6hdr *icmph = (struct icmp6hdr *)skb->h.raw; |
| struct sock_exterr_skb *serr; |
| |
| if (!np->recverr) |
| return; |
| |
| skb = skb_clone(skb, GFP_ATOMIC); |
| if (!skb) |
| return; |
| |
| serr = SKB_EXT_ERR(skb); |
| serr->ee.ee_errno = err; |
| serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6; |
| serr->ee.ee_type = icmph->icmp6_type; |
| serr->ee.ee_code = icmph->icmp6_code; |
| serr->ee.ee_pad = 0; |
| serr->ee.ee_info = info; |
| serr->ee.ee_data = 0; |
| serr->addr_offset = (u8*)&(((struct ipv6hdr*)(icmph+1))->daddr) - skb->nh.raw; |
| serr->port = port; |
| |
| skb->h.raw = payload; |
| __skb_pull(skb, payload - skb->data); |
| |
| if (sock_queue_err_skb(sk, skb)) |
| kfree_skb(skb); |
| } |
| |
| void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info) |
| { |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| struct sock_exterr_skb *serr; |
| struct ipv6hdr *iph; |
| struct sk_buff *skb; |
| |
| if (!np->recverr) |
| return; |
| |
| skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); |
| if (!skb) |
| return; |
| |
| iph = (struct ipv6hdr*)skb_put(skb, sizeof(struct ipv6hdr)); |
| skb->nh.ipv6h = iph; |
| ipv6_addr_copy(&iph->daddr, &fl->fl6_dst); |
| |
| serr = SKB_EXT_ERR(skb); |
| serr->ee.ee_errno = err; |
| serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; |
| serr->ee.ee_type = 0; |
| serr->ee.ee_code = 0; |
| serr->ee.ee_pad = 0; |
| serr->ee.ee_info = info; |
| serr->ee.ee_data = 0; |
| serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw; |
| serr->port = fl->fl_ip_dport; |
| |
| skb->h.raw = skb->tail; |
| __skb_pull(skb, skb->tail - skb->data); |
| |
| if (sock_queue_err_skb(sk, skb)) |
| kfree_skb(skb); |
| } |
| |
| /* |
| * Handle MSG_ERRQUEUE |
| */ |
| int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len) |
| { |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| struct sock_exterr_skb *serr; |
| struct sk_buff *skb, *skb2; |
| struct sockaddr_in6 *sin; |
| struct { |
| struct sock_extended_err ee; |
| struct sockaddr_in6 offender; |
| } errhdr; |
| int err; |
| int copied; |
| |
| err = -EAGAIN; |
| skb = skb_dequeue(&sk->sk_error_queue); |
| if (skb == NULL) |
| goto out; |
| |
| copied = skb->len; |
| if (copied > len) { |
| msg->msg_flags |= MSG_TRUNC; |
| copied = len; |
| } |
| err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); |
| if (err) |
| goto out_free_skb; |
| |
| sock_recv_timestamp(msg, sk, skb); |
| |
| serr = SKB_EXT_ERR(skb); |
| |
| sin = (struct sockaddr_in6 *)msg->msg_name; |
| if (sin) { |
| sin->sin6_family = AF_INET6; |
| sin->sin6_flowinfo = 0; |
| sin->sin6_port = serr->port; |
| sin->sin6_scope_id = 0; |
| if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) { |
| ipv6_addr_copy(&sin->sin6_addr, |
| (struct in6_addr *)(skb->nh.raw + serr->addr_offset)); |
| if (np->sndflow) |
| sin->sin6_flowinfo = *(__be32*)(skb->nh.raw + serr->addr_offset - 24) & IPV6_FLOWINFO_MASK; |
| if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) |
| sin->sin6_scope_id = IP6CB(skb)->iif; |
| } else { |
| ipv6_addr_set(&sin->sin6_addr, 0, 0, |
| htonl(0xffff), |
| *(__be32*)(skb->nh.raw + serr->addr_offset)); |
| } |
| } |
| |
| memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); |
| sin = &errhdr.offender; |
| sin->sin6_family = AF_UNSPEC; |
| if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) { |
| sin->sin6_family = AF_INET6; |
| sin->sin6_flowinfo = 0; |
| sin->sin6_scope_id = 0; |
| if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) { |
| ipv6_addr_copy(&sin->sin6_addr, &skb->nh.ipv6h->saddr); |
| if (np->rxopt.all) |
| datagram_recv_ctl(sk, msg, skb); |
| if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) |
| sin->sin6_scope_id = IP6CB(skb)->iif; |
| } else { |
| struct inet_sock *inet = inet_sk(sk); |
| |
| ipv6_addr_set(&sin->sin6_addr, 0, 0, |
| htonl(0xffff), |
| skb->nh.iph->saddr); |
| if (inet->cmsg_flags) |
| ip_cmsg_recv(msg, skb); |
| } |
| } |
| |
| put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr); |
| |
| /* Now we could try to dump offended packet options */ |
| |
| msg->msg_flags |= MSG_ERRQUEUE; |
| err = copied; |
| |
| /* Reset and regenerate socket error */ |
| spin_lock_bh(&sk->sk_error_queue.lock); |
| sk->sk_err = 0; |
| if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) { |
| sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; |
| spin_unlock_bh(&sk->sk_error_queue.lock); |
| sk->sk_error_report(sk); |
| } else { |
| spin_unlock_bh(&sk->sk_error_queue.lock); |
| } |
| |
| out_free_skb: |
| kfree_skb(skb); |
| out: |
| return err; |
| } |
| |
| |
| |
| int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb) |
| { |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| struct inet6_skb_parm *opt = IP6CB(skb); |
| |
| if (np->rxopt.bits.rxinfo) { |
| struct in6_pktinfo src_info; |
| |
| src_info.ipi6_ifindex = opt->iif; |
| ipv6_addr_copy(&src_info.ipi6_addr, &skb->nh.ipv6h->daddr); |
| put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); |
| } |
| |
| if (np->rxopt.bits.rxhlim) { |
| int hlim = skb->nh.ipv6h->hop_limit; |
| put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); |
| } |
| |
| if (np->rxopt.bits.rxtclass) { |
| int tclass = (ntohl(*(__be32 *)skb->nh.ipv6h) >> 20) & 0xff; |
| put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); |
| } |
| |
| if (np->rxopt.bits.rxflow && (*(__be32*)skb->nh.raw & IPV6_FLOWINFO_MASK)) { |
| __be32 flowinfo = *(__be32*)skb->nh.raw & IPV6_FLOWINFO_MASK; |
| put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); |
| } |
| |
| /* HbH is allowed only once */ |
| if (np->rxopt.bits.hopopts && opt->hop) { |
| u8 *ptr = skb->nh.raw + opt->hop; |
| put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); |
| } |
| |
| if (opt->lastopt && |
| (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { |
| /* |
| * Silly enough, but we need to reparse in order to |
| * report extension headers (except for HbH) |
| * in order. |
| * |
| * Also note that IPV6_RECVRTHDRDSTOPTS is NOT |
| * (and WILL NOT be) defined because |
| * IPV6_RECVDSTOPTS is more generic. --yoshfuji |
| */ |
| unsigned int off = sizeof(struct ipv6hdr); |
| u8 nexthdr = skb->nh.ipv6h->nexthdr; |
| |
| while (off <= opt->lastopt) { |
| unsigned len; |
| u8 *ptr = skb->nh.raw + off; |
| |
| switch(nexthdr) { |
| case IPPROTO_DSTOPTS: |
| nexthdr = ptr[0]; |
| len = (ptr[1] + 1) << 3; |
| if (np->rxopt.bits.dstopts) |
| put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr); |
| break; |
| case IPPROTO_ROUTING: |
| nexthdr = ptr[0]; |
| len = (ptr[1] + 1) << 3; |
| if (np->rxopt.bits.srcrt) |
| put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr); |
| break; |
| case IPPROTO_AH: |
| nexthdr = ptr[0]; |
| len = (ptr[1] + 2) << 2; |
| break; |
| default: |
| nexthdr = ptr[0]; |
| len = (ptr[1] + 1) << 3; |
| break; |
| } |
| |
| off += len; |
| } |
| } |
| |
| /* socket options in old style */ |
| if (np->rxopt.bits.rxoinfo) { |
| struct in6_pktinfo src_info; |
| |
| src_info.ipi6_ifindex = opt->iif; |
| ipv6_addr_copy(&src_info.ipi6_addr, &skb->nh.ipv6h->daddr); |
| put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); |
| } |
| if (np->rxopt.bits.rxohlim) { |
| int hlim = skb->nh.ipv6h->hop_limit; |
| put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); |
| } |
| if (np->rxopt.bits.ohopopts && opt->hop) { |
| u8 *ptr = skb->nh.raw + opt->hop; |
| put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr); |
| } |
| if (np->rxopt.bits.odstopts && opt->dst0) { |
| u8 *ptr = skb->nh.raw + opt->dst0; |
| put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); |
| } |
| if (np->rxopt.bits.osrcrt && opt->srcrt) { |
| struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(skb->nh.raw + opt->srcrt); |
| put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr); |
| } |
| if (np->rxopt.bits.odstopts && opt->dst1) { |
| u8 *ptr = skb->nh.raw + opt->dst1; |
| put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); |
| } |
| return 0; |
| } |
| |
| int datagram_send_ctl(struct msghdr *msg, struct flowi *fl, |
| struct ipv6_txoptions *opt, |
| int *hlimit, int *tclass) |
| { |
| struct in6_pktinfo *src_info; |
| struct cmsghdr *cmsg; |
| struct ipv6_rt_hdr *rthdr; |
| struct ipv6_opt_hdr *hdr; |
| int len; |
| int err = 0; |
| |
| for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { |
| int addr_type; |
| struct net_device *dev = NULL; |
| |
| if (!CMSG_OK(msg, cmsg)) { |
| err = -EINVAL; |
| goto exit_f; |
| } |
| |
| if (cmsg->cmsg_level != SOL_IPV6) |
| continue; |
| |
| switch (cmsg->cmsg_type) { |
| case IPV6_PKTINFO: |
| case IPV6_2292PKTINFO: |
| if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { |
| err = -EINVAL; |
| goto exit_f; |
| } |
| |
| src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); |
| |
| if (src_info->ipi6_ifindex) { |
| if (fl->oif && src_info->ipi6_ifindex != fl->oif) |
| return -EINVAL; |
| fl->oif = src_info->ipi6_ifindex; |
| } |
| |
| addr_type = ipv6_addr_type(&src_info->ipi6_addr); |
| |
| if (addr_type == IPV6_ADDR_ANY) |
| break; |
| |
| if (addr_type & IPV6_ADDR_LINKLOCAL) { |
| if (!src_info->ipi6_ifindex) |
| return -EINVAL; |
| else { |
| dev = dev_get_by_index(src_info->ipi6_ifindex); |
| if (!dev) |
| return -ENODEV; |
| } |
| } |
| if (!ipv6_chk_addr(&src_info->ipi6_addr, dev, 0)) { |
| if (dev) |
| dev_put(dev); |
| err = -EINVAL; |
| goto exit_f; |
| } |
| if (dev) |
| dev_put(dev); |
| |
| ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr); |
| break; |
| |
| case IPV6_FLOWINFO: |
| if (cmsg->cmsg_len < CMSG_LEN(4)) { |
| err = -EINVAL; |
| goto exit_f; |
| } |
| |
| if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) { |
| if ((fl->fl6_flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { |
| err = -EINVAL; |
| goto exit_f; |
| } |
| } |
| fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg); |
| break; |
| |
| case IPV6_2292HOPOPTS: |
| case IPV6_HOPOPTS: |
| if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { |
| err = -EINVAL; |
| goto exit_f; |
| } |
| |
| hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); |
| len = ((hdr->hdrlen + 1) << 3); |
| if (cmsg->cmsg_len < CMSG_LEN(len)) { |
| err = -EINVAL; |
| goto exit_f; |
| } |
| if (!capable(CAP_NET_RAW)) { |
| err = -EPERM; |
| goto exit_f; |
| } |
| opt->opt_nflen += len; |
| opt->hopopt = hdr; |
| break; |
| |
| case IPV6_2292DSTOPTS: |
| if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { |
| err = -EINVAL; |
| goto exit_f; |
| } |
| |
| hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); |
| len = ((hdr->hdrlen + 1) << 3); |
| if (cmsg->cmsg_len < CMSG_LEN(len)) { |
| err = -EINVAL; |
| goto exit_f; |
| } |
| if (!capable(CAP_NET_RAW)) { |
| err = -EPERM; |
| goto exit_f; |
| } |
| if (opt->dst1opt) { |
| err = -EINVAL; |
| goto exit_f; |
| } |
| opt->opt_flen += len; |
| opt->dst1opt = hdr; |
| break; |
| |
| case IPV6_DSTOPTS: |
| case IPV6_RTHDRDSTOPTS: |
| if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { |
| err = -EINVAL; |
| goto exit_f; |
| } |
| |
| hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); |
| len = ((hdr->hdrlen + 1) << 3); |
| if (cmsg->cmsg_len < CMSG_LEN(len)) { |
| err = -EINVAL; |
| goto exit_f; |
| } |
| if (!capable(CAP_NET_RAW)) { |
| err = -EPERM; |
| goto exit_f; |
| } |
| if (cmsg->cmsg_type == IPV6_DSTOPTS) { |
| opt->opt_flen += len; |
| opt->dst1opt = hdr; |
| } else { |
| opt->opt_nflen += len; |
| opt->dst0opt = hdr; |
| } |
| break; |
| |
| case IPV6_2292RTHDR: |
| case IPV6_RTHDR: |
| if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { |
| err = -EINVAL; |
| goto exit_f; |
| } |
| |
| rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); |
| |
| switch (rthdr->type) { |
| case IPV6_SRCRT_TYPE_0: |
| #ifdef CONFIG_IPV6_MIP6 |
| case IPV6_SRCRT_TYPE_2: |
| #endif |
| break; |
| default: |
| err = -EINVAL; |
| goto exit_f; |
| } |
| |
| len = ((rthdr->hdrlen + 1) << 3); |
| |
| if (cmsg->cmsg_len < CMSG_LEN(len)) { |
| err = -EINVAL; |
| goto exit_f; |
| } |
| |
| /* segments left must also match */ |
| if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { |
| err = -EINVAL; |
| goto exit_f; |
| } |
| |
| opt->opt_nflen += len; |
| opt->srcrt = rthdr; |
| |
| if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { |
| int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); |
| |
| opt->opt_nflen += dsthdrlen; |
| opt->dst0opt = opt->dst1opt; |
| opt->dst1opt = NULL; |
| opt->opt_flen -= dsthdrlen; |
| } |
| |
| break; |
| |
| case IPV6_2292HOPLIMIT: |
| case IPV6_HOPLIMIT: |
| if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { |
| err = -EINVAL; |
| goto exit_f; |
| } |
| |
| *hlimit = *(int *)CMSG_DATA(cmsg); |
| break; |
| |
| case IPV6_TCLASS: |
| { |
| int tc; |
| |
| err = -EINVAL; |
| if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { |
| goto exit_f; |
| } |
| |
| tc = *(int *)CMSG_DATA(cmsg); |
| if (tc < -1 || tc > 0xff) |
| goto exit_f; |
| |
| err = 0; |
| *tclass = tc; |
| |
| break; |
| } |
| default: |
| LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n", |
| cmsg->cmsg_type); |
| err = -EINVAL; |
| break; |
| }; |
| } |
| |
| exit_f: |
| return err; |
| } |