[deliverable/linux.git] / net / ipv6 / datagram.c

/*
 *	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/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;

	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, 0)) < 0) {
		dst_release(dst);
		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);

	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, 
		     u16 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 = *(u32*)(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),
				      *(u32*)(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.rxflow && (*(u32*)skb->nh.raw & IPV6_FLOWINFO_MASK)) {
		u32 flowinfo = *(u32*)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] + 1) << 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)
{
	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^*(u32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
					err = -EINVAL;
					goto exit_f;
				}
			}
			fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(u32 *)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);

			/*
			 *	TYPE 0
			 */
			if (rthdr->type) {
				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;

		default:
			LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",
			               cmsg->cmsg_type);
			err = -EINVAL;
			break;
		};
	}

exit_f:
	return err;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* common UDP/RAW code
	3	* Linux INET6 implementation
	4	*
	5	* Authors:
	6	* Pedro Roque <roque@di.fc.ul.pt>
	7	*
	8	* $Id: datagram.c,v 1.24 2002/02/01 22:01:04 davem Exp $
	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public License
	12	* as published by the Free Software Foundation; either version
	13	* 2 of the License, or (at your option) any later version.
	14	*/
	15
	16	#include <linux/errno.h>
	17	#include <linux/types.h>
	18	#include <linux/kernel.h>
	19	#include <linux/sched.h>
	20	#include <linux/interrupt.h>
	21	#include <linux/socket.h>
	22	#include <linux/sockios.h>
	23	#include <linux/in6.h>
	24	#include <linux/ipv6.h>
	25	#include <linux/route.h>
	26
	27	#include <net/ipv6.h>
	28	#include <net/ndisc.h>
	29	#include <net/addrconf.h>
	30	#include <net/transp_v6.h>
	31	#include <net/ip6_route.h>
c752f073	32	#include <net/tcp_states.h>
1da177e4 LT	33
	34	#include <linux/errqueue.h>
	35	#include <asm/uaccess.h>
	36
	37	int ip6_datagram_connect(struct sock sk, struct sockaddr uaddr, int addr_len)
	38	{
	39	struct sockaddr_in6 usin = (struct sockaddr_in6 ) uaddr;
	40	struct inet_sock *inet = inet_sk(sk);
	41	struct ipv6_pinfo *np = inet6_sk(sk);
	42	struct in6_addr daddr, final_p = NULL, final;
	43	struct dst_entry *dst;
	44	struct flowi fl;
	45	struct ip6_flowlabel *flowlabel = NULL;
	46	int addr_type;
	47	int err;
	48
	49	if (usin->sin6_family == AF_INET) {
	50	if (__ipv6_only_sock(sk))
	51	return -EAFNOSUPPORT;
	52	err = ip4_datagram_connect(sk, uaddr, addr_len);
	53	goto ipv4_connected;
	54	}
	55
	56	if (addr_len < SIN6_LEN_RFC2133)
	57	return -EINVAL;
	58
	59	if (usin->sin6_family != AF_INET6)
	60	return -EAFNOSUPPORT;
	61
	62	memset(&fl, 0, sizeof(fl));
	63	if (np->sndflow) {
	64	fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
	65	if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
	66	flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
	67	if (flowlabel == NULL)
	68	return -EINVAL;
	69	ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
	70	}
	71	}
	72
	73	addr_type = ipv6_addr_type(&usin->sin6_addr);
	74
	75	if (addr_type == IPV6_ADDR_ANY) {
	76	/*
	77	* connect to self
	78	*/
	79	usin->sin6_addr.s6_addr[15] = 0x01;
	80	}
	81
	82	daddr = &usin->sin6_addr;
	83
	84	if (addr_type == IPV6_ADDR_MAPPED) {
	85	struct sockaddr_in sin;
	86
	87	if (__ipv6_only_sock(sk)) {
	88	err = -ENETUNREACH;
	89	goto out;
	90	}
	91	sin.sin_family = AF_INET;
	92	sin.sin_addr.s_addr = daddr->s6_addr32[3];
	93	sin.sin_port = usin->sin6_port;
	94
	95	err = ip4_datagram_connect(sk,
	96	(struct sockaddr*) &sin,
97	sizeof(sin));
98
99	ipv4_connected:
100	if (err)
101	goto out;
102
103	ipv6_addr_set(&np->daddr, 0, 0, htonl(0x0000ffff), inet->daddr);
104
105	if (ipv6_addr_any(&np->saddr)) {
106	ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000ffff),
107	inet->saddr);
108	}
109
110	if (ipv6_addr_any(&np->rcv_saddr)) {
111	ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000ffff),
112	inet->rcv_saddr);
113	}
114	goto out;
115	}
116
117	if (addr_type&IPV6_ADDR_LINKLOCAL) {
118	if (addr_len >= sizeof(struct sockaddr_in6) &&
119	usin->sin6_scope_id) {
120	if (sk->sk_bound_dev_if &&
121	sk->sk_bound_dev_if != usin->sin6_scope_id) {
122	err = -EINVAL;
123	goto out;
124	}
125	sk->sk_bound_dev_if = usin->sin6_scope_id;
126	if (!sk->sk_bound_dev_if &&
127	(addr_type & IPV6_ADDR_MULTICAST))
128	fl.oif = np->mcast_oif;
129	}
130
131	/* Connect to link-local address requires an interface */
132	if (!sk->sk_bound_dev_if) {
133	err = -EINVAL;
134	goto out;
135	}
136	}
137
138	ipv6_addr_copy(&np->daddr, daddr);
139	np->flow_label = fl.fl6_flowlabel;
140
141	inet->dport = usin->sin6_port;
142
143	/*
144	* Check for a route to destination an obtain the
145	* destination cache for it.
146	*/
147
148	fl.proto = sk->sk_protocol;
149	ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
150	ipv6_addr_copy(&fl.fl6_src, &np->saddr);
151	fl.oif = sk->sk_bound_dev_if;
152	fl.fl_ip_dport = inet->dport;
153	fl.fl_ip_sport = inet->sport;
154
155	if (!fl.oif && (addr_type&IPV6_ADDR_MULTICAST))
156	fl.oif = np->mcast_oif;
157
158	if (flowlabel) {
159	if (flowlabel->opt && flowlabel->opt->srcrt) {
160	struct rt0_hdr rt0 = (struct rt0_hdr ) flowlabel->opt->srcrt;
161	ipv6_addr_copy(&final, &fl.fl6_dst);
162	ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
163	final_p = &final;
164	}
165	} else if (np->opt && np->opt->srcrt) {
166	struct rt0_hdr rt0 = (struct rt0_hdr )np->opt->srcrt;
167	ipv6_addr_copy(&final, &fl.fl6_dst);
168	ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
169	final_p = &final;
170	}
171
172	err = ip6_dst_lookup(sk, &dst, &fl);
173	if (err)
174	goto out;
175	if (final_p)
176	ipv6_addr_copy(&fl.fl6_dst, final_p);
177
178	if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
179	dst_release(dst);
180	goto out;
181	}
182
183	/* source address lookup done in ip6_dst_lookup */
184
185	if (ipv6_addr_any(&np->saddr))
186	ipv6_addr_copy(&np->saddr, &fl.fl6_src);
187
188	if (ipv6_addr_any(&np->rcv_saddr)) {
189	ipv6_addr_copy(&np->rcv_saddr, &fl.fl6_src);
190	inet->rcv_saddr = LOOPBACK4_IPV6;
191	}
192
193	ip6_dst_store(sk, dst,
194	ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
195	&np->daddr : NULL);
196
197	sk->sk_state = TCP_ESTABLISHED;
198	out:
199	fl6_sock_release(flowlabel);
200	return err;
201	}
202
203	void ipv6_icmp_error(struct sock sk, struct sk_buff skb, int err,
204	u16 port, u32 info, u8 *payload)
205	{
206	struct ipv6_pinfo *np = inet6_sk(sk);
207	struct icmp6hdr icmph = (struct icmp6hdr )skb->h.raw;
208	struct sock_exterr_skb *serr;
209
210	if (!np->recverr)
211	return;
212
213	skb = skb_clone(skb, GFP_ATOMIC);
214	if (!skb)
215	return;
216
217	serr = SKB_EXT_ERR(skb);
218	serr->ee.ee_errno = err;
219	serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
220	serr->ee.ee_type = icmph->icmp6_type;
221	serr->ee.ee_code = icmph->icmp6_code;
222	serr->ee.ee_pad = 0;
223	serr->ee.ee_info = info;
224	serr->ee.ee_data = 0;
225	serr->addr_offset = (u8)&(((struct ipv6hdr)(icmph+1))->daddr) - skb->nh.raw;
226	serr->port = port;
227
228	skb->h.raw = payload;
229	__skb_pull(skb, payload - skb->data);
230
231	if (sock_queue_err_skb(sk, skb))
232	kfree_skb(skb);
233	}
234
235	void ipv6_local_error(struct sock sk, int err, struct flowi fl, u32 info)
236	{
237	struct ipv6_pinfo *np = inet6_sk(sk);
238	struct sock_exterr_skb *serr;
239	struct ipv6hdr *iph;
240	struct sk_buff *skb;
241
242	if (!np->recverr)
243	return;
244
245	skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
246	if (!skb)
247	return;
248
249	iph = (struct ipv6hdr*)skb_put(skb, sizeof(struct ipv6hdr));
250	skb->nh.ipv6h = iph;
251	ipv6_addr_copy(&iph->daddr, &fl->fl6_dst);
252
253	serr = SKB_EXT_ERR(skb);
254	serr->ee.ee_errno = err;
255	serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
256	serr->ee.ee_type = 0;
257	serr->ee.ee_code = 0;
258	serr->ee.ee_pad = 0;
259	serr->ee.ee_info = info;
260	serr->ee.ee_data = 0;
261	serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw;
262	serr->port = fl->fl_ip_dport;
263
264	skb->h.raw = skb->tail;
265	__skb_pull(skb, skb->tail - skb->data);
266
267	if (sock_queue_err_skb(sk, skb))
268	kfree_skb(skb);
269	}
270
271	/*
272	* Handle MSG_ERRQUEUE
273	*/
274	int ipv6_recv_error(struct sock sk, struct msghdr msg, int len)
275	{
276	struct ipv6_pinfo *np = inet6_sk(sk);
277	struct sock_exterr_skb *serr;
278	struct sk_buff skb, skb2;
279	struct sockaddr_in6 *sin;
280	struct {
281	struct sock_extended_err ee;
282	struct sockaddr_in6 offender;
283	} errhdr;
284	int err;
285	int copied;
286
287	err = -EAGAIN;
288	skb = skb_dequeue(&sk->sk_error_queue);
289	if (skb == NULL)
290	goto out;
291
292	copied = skb->len;
293	if (copied > len) {
294	msg->msg_flags \|= MSG_TRUNC;
295	copied = len;
296	}
297	err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
298	if (err)
299	goto out_free_skb;
300
301	sock_recv_timestamp(msg, sk, skb);
302
303	serr = SKB_EXT_ERR(skb);
304
305	sin = (struct sockaddr_in6 *)msg->msg_name;
306	if (sin) {
307	sin->sin6_family = AF_INET6;
308	sin->sin6_flowinfo = 0;
309	sin->sin6_port = serr->port;
310	sin->sin6_scope_id = 0;
311	if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
312	ipv6_addr_copy(&sin->sin6_addr,
313	(struct in6_addr *)(skb->nh.raw + serr->addr_offset));
314	if (np->sndflow)
315	sin->sin6_flowinfo = (u32)(skb->nh.raw + serr->addr_offset - 24) & IPV6_FLOWINFO_MASK;
316	if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
317	sin->sin6_scope_id = IP6CB(skb)->iif;
318	} else {
319	ipv6_addr_set(&sin->sin6_addr, 0, 0,
320	htonl(0xffff),
321	(u32)(skb->nh.raw + serr->addr_offset));
322	}
323	}
324
325	memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
326	sin = &errhdr.offender;
327	sin->sin6_family = AF_UNSPEC;
328	if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
329	sin->sin6_family = AF_INET6;
330	sin->sin6_flowinfo = 0;
331	sin->sin6_scope_id = 0;
332	if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
333	ipv6_addr_copy(&sin->sin6_addr, &skb->nh.ipv6h->saddr);
334	if (np->rxopt.all)
335	datagram_recv_ctl(sk, msg, skb);
336	if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
337	sin->sin6_scope_id = IP6CB(skb)->iif;
338	} else {
339	struct inet_sock *inet = inet_sk(sk);
340
341	ipv6_addr_set(&sin->sin6_addr, 0, 0,
342	htonl(0xffff),
343	skb->nh.iph->saddr);
344	if (inet->cmsg_flags)
345	ip_cmsg_recv(msg, skb);
346	}
347	}
348
349	put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
350
351	/* Now we could try to dump offended packet options */
352
353	msg->msg_flags \|= MSG_ERRQUEUE;
354	err = copied;
355
356	/* Reset and regenerate socket error */
e0f9f858	357	spin_lock_bh(&sk->sk_error_queue.lock);
1da177e4 LT	358	sk->sk_err = 0;
	359	if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
	360	sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
e0f9f858	361	spin_unlock_bh(&sk->sk_error_queue.lock);
1da177e4 LT	362	sk->sk_error_report(sk);
1da177e4 LT	363	} else {
e0f9f858	364	spin_unlock_bh(&sk->sk_error_queue.lock);
1da177e4 LT	365	}
	366
	367	out_free_skb:
	368	kfree_skb(skb);
	369	out:
	370	return err;
	371	}
	372
	373
	374
	375	int datagram_recv_ctl(struct sock sk, struct msghdr msg, struct sk_buff *skb)
	376	{
	377	struct ipv6_pinfo *np = inet6_sk(sk);
	378	struct inet6_skb_parm *opt = IP6CB(skb);
	379
	380	if (np->rxopt.bits.rxinfo) {
	381	struct in6_pktinfo src_info;
	382
	383	src_info.ipi6_ifindex = opt->iif;
	384	ipv6_addr_copy(&src_info.ipi6_addr, &skb->nh.ipv6h->daddr);
	385	put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
	386	}
	387
	388	if (np->rxopt.bits.rxhlim) {
	389	int hlim = skb->nh.ipv6h->hop_limit;
	390	put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
	391	}
	392
	393	if (np->rxopt.bits.rxflow && ((u32)skb->nh.raw & IPV6_FLOWINFO_MASK)) {
	394	u32 flowinfo = (u32)skb->nh.raw & IPV6_FLOWINFO_MASK;
	395	put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
	396	}
333fad53 YH	397
333fad53 YH	398	/* HbH is allowed only once */
1da177e4 LT	399	if (np->rxopt.bits.hopopts && opt->hop) {
	400	u8 *ptr = skb->nh.raw + opt->hop;
	401	put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
	402	}
333fad53 YH	403
	404	if (opt->lastopt &&
	405	(np->rxopt.bits.dstopts \|\| np->rxopt.bits.srcrt)) {
	406	/*
	407	* Silly enough, but we need to reparse in order to
	408	* report extension headers (except for HbH)
	409	* in order.
	410	*
	411	* Also note that IPV6_RECVRTHDRDSTOPTS is NOT
	412	* (and WILL NOT be) defined because
	413	* IPV6_RECVDSTOPTS is more generic. --yoshfuji
	414	*/
	415	unsigned int off = sizeof(struct ipv6hdr);
	416	u8 nexthdr = skb->nh.ipv6h->nexthdr;
	417
	418	while (off <= opt->lastopt) {
	419	unsigned len;
	420	u8 *ptr = skb->nh.raw + off;
	421
	422	switch(nexthdr) {
	423	case IPPROTO_DSTOPTS:
	424	nexthdr = ptr[0];
	425	len = (ptr[1] + 1) << 3;
	426	if (np->rxopt.bits.dstopts)
	427	put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
	428	break;
	429	case IPPROTO_ROUTING:
	430	nexthdr = ptr[0];
	431	len = (ptr[1] + 1) << 3;
	432	if (np->rxopt.bits.srcrt)
	433	put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
	434	break;
	435	case IPPROTO_AH:
	436	nexthdr = ptr[0];
	437	len = (ptr[1] + 1) << 2;
	438	break;
	439	default:
	440	nexthdr = ptr[0];
	441	len = (ptr[1] + 1) << 3;
	442	break;
	443	}
	444
	445	off += len;
	446	}
	447	}
	448
	449	/* socket options in old style */
	450	if (np->rxopt.bits.rxoinfo) {
	451	struct in6_pktinfo src_info;
	452
	453	src_info.ipi6_ifindex = opt->iif;
	454	ipv6_addr_copy(&src_info.ipi6_addr, &skb->nh.ipv6h->daddr);
	455	put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
	456	}
	457	if (np->rxopt.bits.rxohlim) {
	458	int hlim = skb->nh.ipv6h->hop_limit;
	459	put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
	460	}
	461	if (np->rxopt.bits.ohopopts && opt->hop) {
	462	u8 *ptr = skb->nh.raw + opt->hop;
	463	put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
	464	}
	465	if (np->rxopt.bits.odstopts && opt->dst0) {
1da177e4	466	u8 *ptr = skb->nh.raw + opt->dst0;
333fad53	467	put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
1da177e4	468	}
333fad53	469	if (np->rxopt.bits.osrcrt && opt->srcrt) {
1da177e4	470	struct ipv6_rt_hdr rthdr = (struct ipv6_rt_hdr )(skb->nh.raw + opt->srcrt);
333fad53	471	put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
1da177e4	472	}
333fad53	473	if (np->rxopt.bits.odstopts && opt->dst1) {
1da177e4	474	u8 *ptr = skb->nh.raw + opt->dst1;
333fad53	475	put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
1da177e4 LT	476	}
	477	return 0;
	478	}
	479
	480	int datagram_send_ctl(struct msghdr msg, struct flowi fl,
	481	struct ipv6_txoptions *opt,
	482	int *hlimit)
	483	{
	484	struct in6_pktinfo *src_info;
	485	struct cmsghdr *cmsg;
	486	struct ipv6_rt_hdr *rthdr;
	487	struct ipv6_opt_hdr *hdr;
	488	int len;
	489	int err = 0;
	490
	491	for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
	492	int addr_type;
	493	struct net_device *dev = NULL;
	494
	495	if (!CMSG_OK(msg, cmsg)) {
	496	err = -EINVAL;
	497	goto exit_f;
	498	}
	499
	500	if (cmsg->cmsg_level != SOL_IPV6)
	501	continue;
	502
	503	switch (cmsg->cmsg_type) {
	504	case IPV6_PKTINFO:
333fad53	505	case IPV6_2292PKTINFO:
1da177e4 LT	506	if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
	507	err = -EINVAL;
	508	goto exit_f;
	509	}
	510
	511	src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
	512
	513	if (src_info->ipi6_ifindex) {
	514	if (fl->oif && src_info->ipi6_ifindex != fl->oif)
	515	return -EINVAL;
	516	fl->oif = src_info->ipi6_ifindex;
	517	}
	518
	519	addr_type = ipv6_addr_type(&src_info->ipi6_addr);
	520
	521	if (addr_type == IPV6_ADDR_ANY)
	522	break;
	523
	524	if (addr_type & IPV6_ADDR_LINKLOCAL) {
	525	if (!src_info->ipi6_ifindex)
	526	return -EINVAL;
	527	else {
	528	dev = dev_get_by_index(src_info->ipi6_ifindex);
	529	if (!dev)
	530	return -ENODEV;
	531	}
	532	}
	533	if (!ipv6_chk_addr(&src_info->ipi6_addr, dev, 0)) {
	534	if (dev)
	535	dev_put(dev);
	536	err = -EINVAL;
	537	goto exit_f;
	538	}
	539	if (dev)
	540	dev_put(dev);
	541
	542	ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr);
	543	break;
	544
	545	case IPV6_FLOWINFO:
	546	if (cmsg->cmsg_len < CMSG_LEN(4)) {
	547	err = -EINVAL;
	548	goto exit_f;
	549	}
	550
	551	if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) {
	552	if ((fl->fl6_flowlabel^(u32 )CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
	553	err = -EINVAL;
	554	goto exit_f;
	555	}
	556	}
	557	fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & (u32 )CMSG_DATA(cmsg);
	558	break;
	559
333fad53	560	case IPV6_2292HOPOPTS:
1da177e4 LT	561	case IPV6_HOPOPTS:
	562	if (opt->hopopt \|\| cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
	563	err = -EINVAL;
	564	goto exit_f;
	565	}
	566
	567	hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
	568	len = ((hdr->hdrlen + 1) << 3);
	569	if (cmsg->cmsg_len < CMSG_LEN(len)) {
	570	err = -EINVAL;
	571	goto exit_f;
	572	}
	573	if (!capable(CAP_NET_RAW)) {
	574	err = -EPERM;
	575	goto exit_f;
	576	}
	577	opt->opt_nflen += len;
	578	opt->hopopt = hdr;
	579	break;
	580
333fad53	581	case IPV6_2292DSTOPTS:
1da177e4 LT	582	if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
	583	err = -EINVAL;
	584	goto exit_f;
	585	}
	586
	587	hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
	588	len = ((hdr->hdrlen + 1) << 3);
	589	if (cmsg->cmsg_len < CMSG_LEN(len)) {
	590	err = -EINVAL;
	591	goto exit_f;
	592	}
	593	if (!capable(CAP_NET_RAW)) {
	594	err = -EPERM;
	595	goto exit_f;
	596	}
	597	if (opt->dst1opt) {
	598	err = -EINVAL;
	599	goto exit_f;
	600	}
	601	opt->opt_flen += len;
	602	opt->dst1opt = hdr;
	603	break;
	604
333fad53 YH	605	case IPV6_DSTOPTS:
	606	case IPV6_RTHDRDSTOPTS:
	607	if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
	608	err = -EINVAL;
	609	goto exit_f;
	610	}
	611
	612	hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
	613	len = ((hdr->hdrlen + 1) << 3);
	614	if (cmsg->cmsg_len < CMSG_LEN(len)) {
	615	err = -EINVAL;
	616	goto exit_f;
	617	}
	618	if (!capable(CAP_NET_RAW)) {
	619	err = -EPERM;
	620	goto exit_f;
	621	}
	622	if (cmsg->cmsg_type == IPV6_DSTOPTS) {
	623	opt->opt_flen += len;
	624	opt->dst1opt = hdr;
	625	} else {
	626	opt->opt_nflen += len;
	627	opt->dst0opt = hdr;
	628	}
	629	break;
	630
	631	case IPV6_2292RTHDR:
1da177e4 LT	632	case IPV6_RTHDR:
	633	if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
	634	err = -EINVAL;
	635	goto exit_f;
	636	}
	637
	638	rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
	639
	640	/*
	641	* TYPE 0
	642	*/
	643	if (rthdr->type) {
	644	err = -EINVAL;
	645	goto exit_f;
	646	}
	647
	648	len = ((rthdr->hdrlen + 1) << 3);
	649
	650	if (cmsg->cmsg_len < CMSG_LEN(len)) {
	651	err = -EINVAL;
	652	goto exit_f;
	653	}
	654
	655	/* segments left must also match */
	656	if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
	657	err = -EINVAL;
	658	goto exit_f;
	659	}
	660
	661	opt->opt_nflen += len;
	662	opt->srcrt = rthdr;
	663
333fad53	664	if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
1da177e4 LT	665	int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
	666
	667	opt->opt_nflen += dsthdrlen;
	668	opt->dst0opt = opt->dst1opt;
	669	opt->dst1opt = NULL;
	670	opt->opt_flen -= dsthdrlen;
	671	}
	672
	673	break;
	674
333fad53	675	case IPV6_2292HOPLIMIT:
1da177e4 LT	676	case IPV6_HOPLIMIT:
	677	if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
	678	err = -EINVAL;
	679	goto exit_f;
	680	}
	681
	682	hlimit = (int *)CMSG_DATA(cmsg);
	683	break;
	684
	685	default:
64ce2073 PM	686	LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",
64ce2073 PM	687	cmsg->cmsg_type);
1da177e4 LT	688	err = -EINVAL;
	689	break;
	690	};
	691	}
	692
	693	exit_f:
	694	return err;
	695	}