[GitHub/mt8127/android_kernel_alcatel_ttab.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/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, 0)) < 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, 
		     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 = *(__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),
				      *(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.rxtclass) {
		int tclass = (ntohl(*(u32 *)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;
}
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
4fc268d2	16	#include <linux/capability.h>
1da177e4 LT	17	#include <linux/errno.h>
	18	#include <linux/types.h>
	19	#include <linux/kernel.h>
	20	#include <linux/sched.h>
	21	#include <linux/interrupt.h>
	22	#include <linux/socket.h>
	23	#include <linux/sockios.h>
	24	#include <linux/in6.h>
	25	#include <linux/ipv6.h>
	26	#include <linux/route.h>
	27
	28	#include <net/ipv6.h>
	29	#include <net/ndisc.h>
	30	#include <net/addrconf.h>
	31	#include <net/transp_v6.h>
	32	#include <net/ip6_route.h>
c752f073	33	#include <net/tcp_states.h>
1da177e4 LT	34
	35	#include <linux/errqueue.h>
	36	#include <asm/uaccess.h>
	37
	38	int ip6_datagram_connect(struct sock sk, struct sockaddr uaddr, int addr_len)
	39	{
	40	struct sockaddr_in6 usin = (struct sockaddr_in6 ) uaddr;
	41	struct inet_sock *inet = inet_sk(sk);
	42	struct ipv6_pinfo *np = inet6_sk(sk);
	43	struct in6_addr daddr, final_p = NULL, final;
	44	struct dst_entry *dst;
	45	struct flowi fl;
	46	struct ip6_flowlabel *flowlabel = NULL;
	47	int addr_type;
	48	int err;
	49
	50	if (usin->sin6_family == AF_INET) {
	51	if (__ipv6_only_sock(sk))
	52	return -EAFNOSUPPORT;
	53	err = ip4_datagram_connect(sk, uaddr, addr_len);
	54	goto ipv4_connected;
	55	}
	56
	57	if (addr_len < SIN6_LEN_RFC2133)
	58	return -EINVAL;
	59
	60	if (usin->sin6_family != AF_INET6)
	61	return -EAFNOSUPPORT;
	62
	63	memset(&fl, 0, sizeof(fl));
	64	if (np->sndflow) {
	65	fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
	66	if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
	67	flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
	68	if (flowlabel == NULL)
	69	return -EINVAL;
	70	ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
	71	}
	72	}
	73
	74	addr_type = ipv6_addr_type(&usin->sin6_addr);
	75
	76	if (addr_type == IPV6_ADDR_ANY) {
	77	/*
	78	* connect to self
	79	*/
	80	usin->sin6_addr.s6_addr[15] = 0x01;
	81	}
	82
	83	daddr = &usin->sin6_addr;
	84
	85	if (addr_type == IPV6_ADDR_MAPPED) {
	86	struct sockaddr_in sin;
	87
	88	if (__ipv6_only_sock(sk)) {
	89	err = -ENETUNREACH;
	90	goto out;
	91	}
	92	sin.sin_family = AF_INET;
	93	sin.sin_addr.s_addr = daddr->s6_addr32[3];
	94	sin.sin_port = usin->sin6_port;
	95
	96	err = ip4_datagram_connect(sk,
	97	(struct sockaddr*) &sin,
98	sizeof(sin));
99
100	ipv4_connected:
101	if (err)
102	goto out;
103
104	ipv6_addr_set(&np->daddr, 0, 0, htonl(0x0000ffff), inet->daddr);
105
106	if (ipv6_addr_any(&np->saddr)) {
107	ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000ffff),
108	inet->saddr);
109	}
110
111	if (ipv6_addr_any(&np->rcv_saddr)) {
112	ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000ffff),
113	inet->rcv_saddr);
114	}
115	goto out;
116	}
117
118	if (addr_type&IPV6_ADDR_LINKLOCAL) {
119	if (addr_len >= sizeof(struct sockaddr_in6) &&
120	usin->sin6_scope_id) {
121	if (sk->sk_bound_dev_if &&
122	sk->sk_bound_dev_if != usin->sin6_scope_id) {
123	err = -EINVAL;
124	goto out;
125	}
126	sk->sk_bound_dev_if = usin->sin6_scope_id;
127	if (!sk->sk_bound_dev_if &&
128	(addr_type & IPV6_ADDR_MULTICAST))
129	fl.oif = np->mcast_oif;
130	}
131
132	/* Connect to link-local address requires an interface */
133	if (!sk->sk_bound_dev_if) {
134	err = -EINVAL;
135	goto out;
136	}
137	}
138
139	ipv6_addr_copy(&np->daddr, daddr);
140	np->flow_label = fl.fl6_flowlabel;
141
142	inet->dport = usin->sin6_port;
143
144	/*
145	* Check for a route to destination an obtain the
146	* destination cache for it.
147	*/
148
149	fl.proto = sk->sk_protocol;
150	ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
151	ipv6_addr_copy(&fl.fl6_src, &np->saddr);
152	fl.oif = sk->sk_bound_dev_if;
153	fl.fl_ip_dport = inet->dport;
154	fl.fl_ip_sport = inet->sport;
155
156	if (!fl.oif && (addr_type&IPV6_ADDR_MULTICAST))
157	fl.oif = np->mcast_oif;
158
beb8d13b VY	159	security_sk_classify_flow(sk, &fl);
beb8d13b VY	160
1da177e4 LT	161	if (flowlabel) {
	162	if (flowlabel->opt && flowlabel->opt->srcrt) {
	163	struct rt0_hdr rt0 = (struct rt0_hdr ) flowlabel->opt->srcrt;
	164	ipv6_addr_copy(&final, &fl.fl6_dst);
	165	ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
	166	final_p = &final;
	167	}
	168	} else if (np->opt && np->opt->srcrt) {
	169	struct rt0_hdr rt0 = (struct rt0_hdr )np->opt->srcrt;
	170	ipv6_addr_copy(&final, &fl.fl6_dst);
	171	ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
	172	final_p = &final;
	173	}
	174
	175	err = ip6_dst_lookup(sk, &dst, &fl);
	176	if (err)
	177	goto out;
	178	if (final_p)
	179	ipv6_addr_copy(&fl.fl6_dst, final_p);
	180
e104411b	181	if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0)
1da177e4	182	goto out;
1da177e4 LT	183
	184	/* source address lookup done in ip6_dst_lookup */
	185
	186	if (ipv6_addr_any(&np->saddr))
	187	ipv6_addr_copy(&np->saddr, &fl.fl6_src);
	188
	189	if (ipv6_addr_any(&np->rcv_saddr)) {
	190	ipv6_addr_copy(&np->rcv_saddr, &fl.fl6_src);
	191	inet->rcv_saddr = LOOPBACK4_IPV6;
	192	}
	193
	194	ip6_dst_store(sk, dst,
	195	ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
8e1ef0a9 YH	196	&np->daddr : NULL,
	197	#ifdef CONFIG_IPV6_SUBTREES
	198	ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
	199	&np->saddr :
	200	#endif
	201	NULL);
1da177e4 LT	202
	203	sk->sk_state = TCP_ESTABLISHED;
	204	out:
	205	fl6_sock_release(flowlabel);
	206	return err;
	207	}
	208
	209	void ipv6_icmp_error(struct sock sk, struct sk_buff skb, int err,
	210	u16 port, u32 info, u8 *payload)
	211	{
	212	struct ipv6_pinfo *np = inet6_sk(sk);
	213	struct icmp6hdr icmph = (struct icmp6hdr )skb->h.raw;
	214	struct sock_exterr_skb *serr;
	215
	216	if (!np->recverr)
	217	return;
	218
	219	skb = skb_clone(skb, GFP_ATOMIC);
	220	if (!skb)
	221	return;
	222
	223	serr = SKB_EXT_ERR(skb);
	224	serr->ee.ee_errno = err;
	225	serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
	226	serr->ee.ee_type = icmph->icmp6_type;
	227	serr->ee.ee_code = icmph->icmp6_code;
	228	serr->ee.ee_pad = 0;
	229	serr->ee.ee_info = info;
	230	serr->ee.ee_data = 0;
	231	serr->addr_offset = (u8)&(((struct ipv6hdr)(icmph+1))->daddr) - skb->nh.raw;
	232	serr->port = port;
	233
	234	skb->h.raw = payload;
	235	__skb_pull(skb, payload - skb->data);
	236
	237	if (sock_queue_err_skb(sk, skb))
	238	kfree_skb(skb);
	239	}
	240
	241	void ipv6_local_error(struct sock sk, int err, struct flowi fl, u32 info)
	242	{
	243	struct ipv6_pinfo *np = inet6_sk(sk);
	244	struct sock_exterr_skb *serr;
	245	struct ipv6hdr *iph;
	246	struct sk_buff *skb;
	247
	248	if (!np->recverr)
	249	return;
	250
	251	skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
	252	if (!skb)
	253	return;
	254
	255	iph = (struct ipv6hdr*)skb_put(skb, sizeof(struct ipv6hdr));
	256	skb->nh.ipv6h = iph;
	257	ipv6_addr_copy(&iph->daddr, &fl->fl6_dst);
	258
	259	serr = SKB_EXT_ERR(skb);
	260	serr->ee.ee_errno = err;
	261	serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
	262	serr->ee.ee_type = 0;
	263	serr->ee.ee_code = 0;
	264	serr->ee.ee_pad = 0;
	265	serr->ee.ee_info = info;
266	serr->ee.ee_data = 0;
267	serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw;
268	serr->port = fl->fl_ip_dport;
269
270	skb->h.raw = skb->tail;
271	__skb_pull(skb, skb->tail - skb->data);
272
273	if (sock_queue_err_skb(sk, skb))
274	kfree_skb(skb);
275	}
276
277	/*
278	* Handle MSG_ERRQUEUE
279	*/
280	int ipv6_recv_error(struct sock sk, struct msghdr msg, int len)
281	{
282	struct ipv6_pinfo *np = inet6_sk(sk);
283	struct sock_exterr_skb *serr;
284	struct sk_buff skb, skb2;
285	struct sockaddr_in6 *sin;
286	struct {
287	struct sock_extended_err ee;
288	struct sockaddr_in6 offender;
289	} errhdr;
290	int err;
291	int copied;
292
293	err = -EAGAIN;
294	skb = skb_dequeue(&sk->sk_error_queue);
295	if (skb == NULL)
296	goto out;
297
298	copied = skb->len;
299	if (copied > len) {
300	msg->msg_flags \|= MSG_TRUNC;
301	copied = len;
302	}
303	err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
304	if (err)
305	goto out_free_skb;
306
307	sock_recv_timestamp(msg, sk, skb);
308
309	serr = SKB_EXT_ERR(skb);
310
311	sin = (struct sockaddr_in6 *)msg->msg_name;
312	if (sin) {
313	sin->sin6_family = AF_INET6;
314	sin->sin6_flowinfo = 0;
315	sin->sin6_port = serr->port;
316	sin->sin6_scope_id = 0;
317	if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
318	ipv6_addr_copy(&sin->sin6_addr,
319	(struct in6_addr *)(skb->nh.raw + serr->addr_offset));
320	if (np->sndflow)
90bcaf7b	321	sin->sin6_flowinfo = (__be32)(skb->nh.raw + serr->addr_offset - 24) & IPV6_FLOWINFO_MASK;
1da177e4 LT	322	if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
	323	sin->sin6_scope_id = IP6CB(skb)->iif;
	324	} else {
	325	ipv6_addr_set(&sin->sin6_addr, 0, 0,
	326	htonl(0xffff),
	327	(u32)(skb->nh.raw + serr->addr_offset));
	328	}
	329	}
	330
	331	memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
	332	sin = &errhdr.offender;
	333	sin->sin6_family = AF_UNSPEC;
	334	if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
	335	sin->sin6_family = AF_INET6;
	336	sin->sin6_flowinfo = 0;
	337	sin->sin6_scope_id = 0;
	338	if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
	339	ipv6_addr_copy(&sin->sin6_addr, &skb->nh.ipv6h->saddr);
	340	if (np->rxopt.all)
	341	datagram_recv_ctl(sk, msg, skb);
	342	if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
	343	sin->sin6_scope_id = IP6CB(skb)->iif;
	344	} else {
	345	struct inet_sock *inet = inet_sk(sk);
	346
	347	ipv6_addr_set(&sin->sin6_addr, 0, 0,
	348	htonl(0xffff),
	349	skb->nh.iph->saddr);
	350	if (inet->cmsg_flags)
	351	ip_cmsg_recv(msg, skb);
	352	}
	353	}
	354
	355	put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
	356
	357	/* Now we could try to dump offended packet options */
	358
	359	msg->msg_flags \|= MSG_ERRQUEUE;
	360	err = copied;
	361
	362	/* Reset and regenerate socket error */
e0f9f858	363	spin_lock_bh(&sk->sk_error_queue.lock);
1da177e4 LT	364	sk->sk_err = 0;
	365	if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
	366	sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
e0f9f858	367	spin_unlock_bh(&sk->sk_error_queue.lock);
1da177e4 LT	368	sk->sk_error_report(sk);
1da177e4 LT	369	} else {
e0f9f858	370	spin_unlock_bh(&sk->sk_error_queue.lock);
1da177e4 LT	371	}
	372
	373	out_free_skb:
	374	kfree_skb(skb);
	375	out:
	376	return err;
	377	}
	378
	379
	380
	381	int datagram_recv_ctl(struct sock sk, struct msghdr msg, struct sk_buff *skb)
	382	{
	383	struct ipv6_pinfo *np = inet6_sk(sk);
	384	struct inet6_skb_parm *opt = IP6CB(skb);
	385
	386	if (np->rxopt.bits.rxinfo) {
	387	struct in6_pktinfo src_info;
	388
	389	src_info.ipi6_ifindex = opt->iif;
	390	ipv6_addr_copy(&src_info.ipi6_addr, &skb->nh.ipv6h->daddr);
	391	put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
	392	}
	393
	394	if (np->rxopt.bits.rxhlim) {
	395	int hlim = skb->nh.ipv6h->hop_limit;
	396	put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
	397	}
	398
41a1f8ea YH	399	if (np->rxopt.bits.rxtclass) {
	400	int tclass = (ntohl((u32 )skb->nh.ipv6h) >> 20) & 0xff;
	401	put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
	402	}
	403
90bcaf7b AV	404	if (np->rxopt.bits.rxflow && ((__be32)skb->nh.raw & IPV6_FLOWINFO_MASK)) {
90bcaf7b AV	405	__be32 flowinfo = (__be32)skb->nh.raw & IPV6_FLOWINFO_MASK;
1da177e4 LT	406	put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1da177e4 LT	407	}
333fad53 YH	408
333fad53 YH	409	/* HbH is allowed only once */
1da177e4 LT	410	if (np->rxopt.bits.hopopts && opt->hop) {
	411	u8 *ptr = skb->nh.raw + opt->hop;
	412	put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
	413	}
333fad53 YH	414
	415	if (opt->lastopt &&
	416	(np->rxopt.bits.dstopts \|\| np->rxopt.bits.srcrt)) {
	417	/*
	418	* Silly enough, but we need to reparse in order to
	419	* report extension headers (except for HbH)
	420	* in order.
	421	*
	422	* Also note that IPV6_RECVRTHDRDSTOPTS is NOT
	423	* (and WILL NOT be) defined because
	424	* IPV6_RECVDSTOPTS is more generic. --yoshfuji
	425	*/
	426	unsigned int off = sizeof(struct ipv6hdr);
	427	u8 nexthdr = skb->nh.ipv6h->nexthdr;
	428
	429	while (off <= opt->lastopt) {
	430	unsigned len;
	431	u8 *ptr = skb->nh.raw + off;
	432
	433	switch(nexthdr) {
	434	case IPPROTO_DSTOPTS:
	435	nexthdr = ptr[0];
	436	len = (ptr[1] + 1) << 3;
	437	if (np->rxopt.bits.dstopts)
	438	put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
	439	break;
	440	case IPPROTO_ROUTING:
	441	nexthdr = ptr[0];
	442	len = (ptr[1] + 1) << 3;
	443	if (np->rxopt.bits.srcrt)
	444	put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
	445	break;
	446	case IPPROTO_AH:
	447	nexthdr = ptr[0];
a3059893	448	len = (ptr[1] + 2) << 2;
333fad53 YH	449	break;
	450	default:
	451	nexthdr = ptr[0];
	452	len = (ptr[1] + 1) << 3;
	453	break;
	454	}
	455
	456	off += len;
	457	}
	458	}
	459
	460	/* socket options in old style */
	461	if (np->rxopt.bits.rxoinfo) {
	462	struct in6_pktinfo src_info;
	463
	464	src_info.ipi6_ifindex = opt->iif;
	465	ipv6_addr_copy(&src_info.ipi6_addr, &skb->nh.ipv6h->daddr);
	466	put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
	467	}
	468	if (np->rxopt.bits.rxohlim) {
	469	int hlim = skb->nh.ipv6h->hop_limit;
	470	put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
	471	}
	472	if (np->rxopt.bits.ohopopts && opt->hop) {
	473	u8 *ptr = skb->nh.raw + opt->hop;
	474	put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
	475	}
	476	if (np->rxopt.bits.odstopts && opt->dst0) {
1da177e4	477	u8 *ptr = skb->nh.raw + opt->dst0;
333fad53	478	put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
1da177e4	479	}
333fad53	480	if (np->rxopt.bits.osrcrt && opt->srcrt) {
1da177e4	481	struct ipv6_rt_hdr rthdr = (struct ipv6_rt_hdr )(skb->nh.raw + opt->srcrt);
333fad53	482	put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
1da177e4	483	}
333fad53	484	if (np->rxopt.bits.odstopts && opt->dst1) {
1da177e4	485	u8 *ptr = skb->nh.raw + opt->dst1;
333fad53	486	put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
1da177e4 LT	487	}
	488	return 0;
	489	}
	490
	491	int datagram_send_ctl(struct msghdr msg, struct flowi fl,
	492	struct ipv6_txoptions *opt,
41a1f8ea	493	int hlimit, int tclass)
1da177e4 LT	494	{
	495	struct in6_pktinfo *src_info;
	496	struct cmsghdr *cmsg;
	497	struct ipv6_rt_hdr *rthdr;
	498	struct ipv6_opt_hdr *hdr;
	499	int len;
	500	int err = 0;
	501
	502	for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
	503	int addr_type;
	504	struct net_device *dev = NULL;
	505
	506	if (!CMSG_OK(msg, cmsg)) {
	507	err = -EINVAL;
	508	goto exit_f;
	509	}
	510
	511	if (cmsg->cmsg_level != SOL_IPV6)
	512	continue;
	513
	514	switch (cmsg->cmsg_type) {
	515	case IPV6_PKTINFO:
333fad53	516	case IPV6_2292PKTINFO:
1da177e4 LT	517	if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
	518	err = -EINVAL;
	519	goto exit_f;
	520	}
	521
	522	src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
	523
	524	if (src_info->ipi6_ifindex) {
	525	if (fl->oif && src_info->ipi6_ifindex != fl->oif)
	526	return -EINVAL;
	527	fl->oif = src_info->ipi6_ifindex;
	528	}
	529
	530	addr_type = ipv6_addr_type(&src_info->ipi6_addr);
	531
	532	if (addr_type == IPV6_ADDR_ANY)
	533	break;
	534
	535	if (addr_type & IPV6_ADDR_LINKLOCAL) {
	536	if (!src_info->ipi6_ifindex)
	537	return -EINVAL;
	538	else {
	539	dev = dev_get_by_index(src_info->ipi6_ifindex);
	540	if (!dev)
	541	return -ENODEV;
	542	}
	543	}
	544	if (!ipv6_chk_addr(&src_info->ipi6_addr, dev, 0)) {
	545	if (dev)
	546	dev_put(dev);
	547	err = -EINVAL;
	548	goto exit_f;
	549	}
	550	if (dev)
	551	dev_put(dev);
	552
	553	ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr);
	554	break;
	555
	556	case IPV6_FLOWINFO:
	557	if (cmsg->cmsg_len < CMSG_LEN(4)) {
	558	err = -EINVAL;
	559	goto exit_f;
	560	}
	561
	562	if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) {
90bcaf7b	563	if ((fl->fl6_flowlabel^(__be32 )CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
1da177e4 LT	564	err = -EINVAL;
	565	goto exit_f;
	566	}
	567	}
90bcaf7b	568	fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & (__be32 )CMSG_DATA(cmsg);
1da177e4 LT	569	break;
1da177e4 LT	570
333fad53	571	case IPV6_2292HOPOPTS:
1da177e4 LT	572	case IPV6_HOPOPTS:
	573	if (opt->hopopt \|\| cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
	574	err = -EINVAL;
	575	goto exit_f;
	576	}
	577
	578	hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
	579	len = ((hdr->hdrlen + 1) << 3);
	580	if (cmsg->cmsg_len < CMSG_LEN(len)) {
	581	err = -EINVAL;
	582	goto exit_f;
	583	}
	584	if (!capable(CAP_NET_RAW)) {
	585	err = -EPERM;
	586	goto exit_f;
	587	}
	588	opt->opt_nflen += len;
	589	opt->hopopt = hdr;
	590	break;
	591
333fad53	592	case IPV6_2292DSTOPTS:
1da177e4 LT	593	if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
	594	err = -EINVAL;
	595	goto exit_f;
	596	}
	597
	598	hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
	599	len = ((hdr->hdrlen + 1) << 3);
	600	if (cmsg->cmsg_len < CMSG_LEN(len)) {
	601	err = -EINVAL;
	602	goto exit_f;
	603	}
	604	if (!capable(CAP_NET_RAW)) {
	605	err = -EPERM;
	606	goto exit_f;
	607	}
	608	if (opt->dst1opt) {
	609	err = -EINVAL;
	610	goto exit_f;
	611	}
	612	opt->opt_flen += len;
	613	opt->dst1opt = hdr;
	614	break;
	615
333fad53 YH	616	case IPV6_DSTOPTS:
	617	case IPV6_RTHDRDSTOPTS:
	618	if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
	619	err = -EINVAL;
	620	goto exit_f;
	621	}
	622
	623	hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
	624	len = ((hdr->hdrlen + 1) << 3);
	625	if (cmsg->cmsg_len < CMSG_LEN(len)) {
	626	err = -EINVAL;
	627	goto exit_f;
	628	}
	629	if (!capable(CAP_NET_RAW)) {
	630	err = -EPERM;
	631	goto exit_f;
	632	}
	633	if (cmsg->cmsg_type == IPV6_DSTOPTS) {
	634	opt->opt_flen += len;
	635	opt->dst1opt = hdr;
	636	} else {
	637	opt->opt_nflen += len;
	638	opt->dst0opt = hdr;
	639	}
	640	break;
	641
	642	case IPV6_2292RTHDR:
1da177e4 LT	643	case IPV6_RTHDR:
	644	if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
	645	err = -EINVAL;
	646	goto exit_f;
	647	}
	648
	649	rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
	650
280a9d34 MN	651	switch (rthdr->type) {
	652	case IPV6_SRCRT_TYPE_0:
	653	#ifdef CONFIG_IPV6_MIP6
	654	case IPV6_SRCRT_TYPE_2:
	655	#endif
	656	break;
	657	default:
1da177e4 LT	658	err = -EINVAL;
	659	goto exit_f;
	660	}
	661
	662	len = ((rthdr->hdrlen + 1) << 3);
	663
	664	if (cmsg->cmsg_len < CMSG_LEN(len)) {
	665	err = -EINVAL;
	666	goto exit_f;
	667	}
	668
	669	/* segments left must also match */
	670	if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
	671	err = -EINVAL;
	672	goto exit_f;
	673	}
	674
	675	opt->opt_nflen += len;
	676	opt->srcrt = rthdr;
	677
333fad53	678	if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
1da177e4 LT	679	int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
	680
	681	opt->opt_nflen += dsthdrlen;
	682	opt->dst0opt = opt->dst1opt;
	683	opt->dst1opt = NULL;
	684	opt->opt_flen -= dsthdrlen;
	685	}
	686
	687	break;
	688
333fad53	689	case IPV6_2292HOPLIMIT:
1da177e4 LT	690	case IPV6_HOPLIMIT:
	691	if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
	692	err = -EINVAL;
	693	goto exit_f;
	694	}
	695
	696	hlimit = (int *)CMSG_DATA(cmsg);
	697	break;
	698
41a1f8ea YH	699	case IPV6_TCLASS:
	700	{
	701	int tc;
	702
	703	err = -EINVAL;
	704	if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
	705	goto exit_f;
	706	}
	707
	708	tc = (int )CMSG_DATA(cmsg);
d0ee011f	709	if (tc < -1 \|\| tc > 0xff)
41a1f8ea YH	710	goto exit_f;
	711
	712	err = 0;
	713	*tclass = tc;
	714
	715	break;
	716	}
1da177e4	717	default:
64ce2073 PM	718	LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",
64ce2073 PM	719	cmsg->cmsg_type);
1da177e4 LT	720	err = -EINVAL;
	721	break;
	722	};
	723	}
	724
	725	exit_f:
	726	return err;
	727	}