[linux-block.git] / net / ipv6 / datagram.c

/*
 *	common UDP/RAW code
 *	Linux INET6 implementation
 *
 *	Authors:
 *	Pedro Roque		<roque@di.fc.ul.pt>
 *
 *	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/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))
			sk->sk_bound_dev_if = 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, XFRM_LOOKUP_WAIT)) < 0) {
		if (err == -EREMOTE)
			err = ip6_dst_blackhole(sk, &dst, &fl);
		if (err < 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 = icmp6_hdr(skb);
	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_network_header(skb);
	serr->port = port;

	__skb_pull(skb, payload - skb->data);
	skb_reset_transport_header(skb);

	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;

	skb_put(skb, sizeof(struct ipv6hdr));
	skb_reset_network_header(skb);
	iph = ipv6_hdr(skb);
	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_network_header(skb);
	serr->port = fl->fl_ip_dport;

	__skb_pull(skb, skb_tail_pointer(skb) - skb->data);
	skb_reset_transport_header(skb);

	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) {
		const unsigned char *nh = skb_network_header(skb);
		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 *)(nh + serr->addr_offset));
			if (np->sndflow)
				sin->sin6_flowinfo =
					(*(__be32 *)(nh + 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 *)(nh + 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, &ipv6_hdr(skb)->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), ip_hdr(skb)->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);
	unsigned char *nh = skb_network_header(skb);

	if (np->rxopt.bits.rxinfo) {
		struct in6_pktinfo src_info;

		src_info.ipi6_ifindex = opt->iif;
		ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr);
		put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
	}

	if (np->rxopt.bits.rxhlim) {
		int hlim = ipv6_hdr(skb)->hop_limit;
		put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
	}

	if (np->rxopt.bits.rxtclass) {
		int tclass = (ntohl(*(__be32 *)ipv6_hdr(skb)) >> 20) & 0xff;
		put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
	}

	if (np->rxopt.bits.rxflow && (*(__be32 *)nh & IPV6_FLOWINFO_MASK)) {
		__be32 flowinfo = *(__be32 *)nh & 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 = nh + 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 = ipv6_hdr(skb)->nexthdr;

		while (off <= opt->lastopt) {
			unsigned len;
			u8 *ptr = nh + 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, &ipv6_hdr(skb)->daddr);
		put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
	}
	if (np->rxopt.bits.rxohlim) {
		int hlim = ipv6_hdr(skb)->hop_limit;
		put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
	}
	if (np->rxopt.bits.ohopopts && opt->hop) {
		u8 *ptr = nh + opt->hop;
		put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
	}
	if (np->rxopt.bits.odstopts && opt->dst0) {
		u8 *ptr = nh + 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 *)(nh + opt->srcrt);
		put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
	}
	if (np->rxopt.bits.odstopts && opt->dst1) {
		u8 *ptr = nh + opt->dst1;
		put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
	}
	return 0;
}

int datagram_send_ctl(struct net *net,
		      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;

		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:
		    {
			struct net_device *dev = NULL;

			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 (fl->oif) {
				dev = dev_get_by_index(net, fl->oif);
				if (!dev)
					return -ENODEV;
			} else if (addr_type & IPV6_ADDR_LINKLOCAL)
				return -EINVAL;

			if (addr_type != IPV6_ADDR_ANY) {
				int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
				if (!ipv6_chk_addr(net, &src_info->ipi6_addr,
						   strict ? dev : NULL, 0))
					err = -EINVAL;
				else
					ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr);
			}

			if (dev)
				dev_put(dev);

			if (err)
				goto exit_f;

			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) {
#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
			case IPV6_SRCRT_TYPE_2:
				break;
#endif
			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);
			if (*hlimit < -1 || *hlimit > 0xff) {
				err = -EINVAL;
				goto exit_f;
			}

			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;
			goto exit_f;
		}
	}

exit_f:
	return err;
}
Commit	Line	Data
1da177e4 LT	1	/*
1da177e4 LT	2	* common UDP/RAW code
1ab1457c	3	* Linux INET6 implementation
1da177e4 LT	4	*
1da177e4 LT	5	* Authors:
1ab1457c	6	* Pedro Roque <roque@di.fc.ul.pt>
1da177e4	7	*
1da177e4 LT	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License
	10	* as published by the Free Software Foundation; either version
	11	* 2 of the License, or (at your option) any later version.
	12	*/
	13
4fc268d2	14	#include <linux/capability.h>
1da177e4 LT	15	#include <linux/errno.h>
	16	#include <linux/types.h>
	17	#include <linux/kernel.h>
1da177e4 LT	18	#include <linux/interrupt.h>
	19	#include <linux/socket.h>
	20	#include <linux/sockios.h>
	21	#include <linux/in6.h>
	22	#include <linux/ipv6.h>
	23	#include <linux/route.h>
	24
	25	#include <net/ipv6.h>
	26	#include <net/ndisc.h>
	27	#include <net/addrconf.h>
	28	#include <net/transp_v6.h>
	29	#include <net/ip6_route.h>
c752f073	30	#include <net/tcp_states.h>
1da177e4 LT	31
	32	#include <linux/errqueue.h>
	33	#include <asm/uaccess.h>
	34
	35	int ip6_datagram_connect(struct sock sk, struct sockaddr uaddr, int addr_len)
	36	{
	37	struct sockaddr_in6 usin = (struct sockaddr_in6 ) uaddr;
	38	struct inet_sock *inet = inet_sk(sk);
	39	struct ipv6_pinfo *np = inet6_sk(sk);
	40	struct in6_addr daddr, final_p = NULL, final;
	41	struct dst_entry *dst;
	42	struct flowi fl;
	43	struct ip6_flowlabel *flowlabel = NULL;
	44	int addr_type;
	45	int err;
	46
	47	if (usin->sin6_family == AF_INET) {
	48	if (__ipv6_only_sock(sk))
	49	return -EAFNOSUPPORT;
	50	err = ip4_datagram_connect(sk, uaddr, addr_len);
	51	goto ipv4_connected;
	52	}
	53
	54	if (addr_len < SIN6_LEN_RFC2133)
1ab1457c	55	return -EINVAL;
1da177e4	56
1ab1457c YH	57	if (usin->sin6_family != AF_INET6)
1ab1457c YH	58	return -EAFNOSUPPORT;
1da177e4 LT	59
	60	memset(&fl, 0, sizeof(fl));
	61	if (np->sndflow) {
	62	fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
	63	if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
	64	flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
	65	if (flowlabel == NULL)
	66	return -EINVAL;
	67	ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
	68	}
	69	}
	70
	71	addr_type = ipv6_addr_type(&usin->sin6_addr);
	72
	73	if (addr_type == IPV6_ADDR_ANY) {
	74	/*
	75	* connect to self
	76	*/
	77	usin->sin6_addr.s6_addr[15] = 0x01;
	78	}
	79
	80	daddr = &usin->sin6_addr;
	81
	82	if (addr_type == IPV6_ADDR_MAPPED) {
	83	struct sockaddr_in sin;
	84
	85	if (__ipv6_only_sock(sk)) {
	86	err = -ENETUNREACH;
	87	goto out;
	88	}
	89	sin.sin_family = AF_INET;
	90	sin.sin_addr.s_addr = daddr->s6_addr32[3];
	91	sin.sin_port = usin->sin6_port;
	92
1ab1457c YH	93	err = ip4_datagram_connect(sk,
1ab1457c YH	94	(struct sockaddr*) &sin,
1da177e4 LT	95	sizeof(sin));
	96
	97	ipv4_connected:
	98	if (err)
	99	goto out;
1ab1457c	100
1da177e4 LT	101	ipv6_addr_set(&np->daddr, 0, 0, htonl(0x0000ffff), inet->daddr);
	102
	103	if (ipv6_addr_any(&np->saddr)) {
	104	ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000ffff),
	105	inet->saddr);
	106	}
	107
	108	if (ipv6_addr_any(&np->rcv_saddr)) {
	109	ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000ffff),
	110	inet->rcv_saddr);
	111	}
	112	goto out;
	113	}
	114
	115	if (addr_type&IPV6_ADDR_LINKLOCAL) {
	116	if (addr_len >= sizeof(struct sockaddr_in6) &&
	117	usin->sin6_scope_id) {
	118	if (sk->sk_bound_dev_if &&
	119	sk->sk_bound_dev_if != usin->sin6_scope_id) {
	120	err = -EINVAL;
	121	goto out;
	122	}
	123	sk->sk_bound_dev_if = usin->sin6_scope_id;
1da177e4 LT	124	}
1da177e4 LT	125
1ac4f008 BH	126	if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST))
	127	sk->sk_bound_dev_if = np->mcast_oif;
	128
1da177e4 LT	129	/* Connect to link-local address requires an interface */
	130	if (!sk->sk_bound_dev_if) {
	131	err = -EINVAL;
	132	goto out;
	133	}
	134	}
	135
	136	ipv6_addr_copy(&np->daddr, daddr);
	137	np->flow_label = fl.fl6_flowlabel;
	138
	139	inet->dport = usin->sin6_port;
	140
	141	/*
	142	* Check for a route to destination an obtain the
	143	* destination cache for it.
	144	*/
	145
	146	fl.proto = sk->sk_protocol;
	147	ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
	148	ipv6_addr_copy(&fl.fl6_src, &np->saddr);
	149	fl.oif = sk->sk_bound_dev_if;
	150	fl.fl_ip_dport = inet->dport;
	151	fl.fl_ip_sport = inet->sport;
	152
	153	if (!fl.oif && (addr_type&IPV6_ADDR_MULTICAST))
	154	fl.oif = np->mcast_oif;
	155
beb8d13b VY	156	security_sk_classify_flow(sk, &fl);
beb8d13b VY	157
1da177e4 LT	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
bb72845e	178	if ((err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT)) < 0) {
14e50e57 DM	179	if (err == -EREMOTE)
	180	err = ip6_dst_blackhole(sk, &dst, &fl);
	181	if (err < 0)
	182	goto out;
	183	}
1da177e4 LT	184
	185	/* source address lookup done in ip6_dst_lookup */
	186
	187	if (ipv6_addr_any(&np->saddr))
	188	ipv6_addr_copy(&np->saddr, &fl.fl6_src);
	189
	190	if (ipv6_addr_any(&np->rcv_saddr)) {
	191	ipv6_addr_copy(&np->rcv_saddr, &fl.fl6_src);
	192	inet->rcv_saddr = LOOPBACK4_IPV6;
	193	}
	194
	195	ip6_dst_store(sk, dst,
	196	ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
8e1ef0a9 YH	197	&np->daddr : NULL,
	198	#ifdef CONFIG_IPV6_SUBTREES
	199	ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
	200	&np->saddr :
	201	#endif
	202	NULL);
1da177e4 LT	203
	204	sk->sk_state = TCP_ESTABLISHED;
	205	out:
	206	fl6_sock_release(flowlabel);
	207	return err;
	208	}
	209
1ab1457c	210	void ipv6_icmp_error(struct sock sk, struct sk_buff skb, int err,
e69a4adc	211	__be16 port, u32 info, u8 *payload)
1da177e4 LT	212	{
1da177e4 LT	213	struct ipv6_pinfo *np = inet6_sk(sk);
cc70ab26	214	struct icmp6hdr *icmph = icmp6_hdr(skb);
1da177e4 LT	215	struct sock_exterr_skb *serr;
	216
	217	if (!np->recverr)
	218	return;
	219
	220	skb = skb_clone(skb, GFP_ATOMIC);
	221	if (!skb)
	222	return;
	223
	224	serr = SKB_EXT_ERR(skb);
	225	serr->ee.ee_errno = err;
	226	serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
1ab1457c	227	serr->ee.ee_type = icmph->icmp6_type;
1da177e4 LT	228	serr->ee.ee_code = icmph->icmp6_code;
	229	serr->ee.ee_pad = 0;
	230	serr->ee.ee_info = info;
	231	serr->ee.ee_data = 0;
d56f90a7 ACM	232	serr->addr_offset = (u8 )&(((struct ipv6hdr )(icmph + 1))->daddr) -
d56f90a7 ACM	233	skb_network_header(skb);
1da177e4 LT	234	serr->port = port;
1da177e4 LT	235
1da177e4	236	__skb_pull(skb, payload - skb->data);
bd82393c	237	skb_reset_transport_header(skb);
1da177e4 LT	238
	239	if (sock_queue_err_skb(sk, skb))
	240	kfree_skb(skb);
	241	}
	242
	243	void ipv6_local_error(struct sock sk, int err, struct flowi fl, u32 info)
	244	{
	245	struct ipv6_pinfo *np = inet6_sk(sk);
	246	struct sock_exterr_skb *serr;
	247	struct ipv6hdr *iph;
	248	struct sk_buff *skb;
	249
	250	if (!np->recverr)
	251	return;
	252
	253	skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
	254	if (!skb)
	255	return;
	256
1ced98e8 ACM	257	skb_put(skb, sizeof(struct ipv6hdr));
1ced98e8 ACM	258	skb_reset_network_header(skb);
0660e03f	259	iph = ipv6_hdr(skb);
1da177e4 LT	260	ipv6_addr_copy(&iph->daddr, &fl->fl6_dst);
	261
	262	serr = SKB_EXT_ERR(skb);
	263	serr->ee.ee_errno = err;
	264	serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
1ab1457c	265	serr->ee.ee_type = 0;
1da177e4 LT	266	serr->ee.ee_code = 0;
	267	serr->ee.ee_pad = 0;
	268	serr->ee.ee_info = info;
	269	serr->ee.ee_data = 0;
d56f90a7	270	serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
1da177e4 LT	271	serr->port = fl->fl_ip_dport;
1da177e4 LT	272
27a884dc	273	__skb_pull(skb, skb_tail_pointer(skb) - skb->data);
bd82393c	274	skb_reset_transport_header(skb);
1da177e4 LT	275
	276	if (sock_queue_err_skb(sk, skb))
	277	kfree_skb(skb);
	278	}
	279
1ab1457c	280	/*
1da177e4 LT	281	* Handle MSG_ERRQUEUE
	282	*/
	283	int ipv6_recv_error(struct sock sk, struct msghdr msg, int len)
	284	{
	285	struct ipv6_pinfo *np = inet6_sk(sk);
	286	struct sock_exterr_skb *serr;
	287	struct sk_buff skb, skb2;
	288	struct sockaddr_in6 *sin;
	289	struct {
	290	struct sock_extended_err ee;
	291	struct sockaddr_in6 offender;
	292	} errhdr;
	293	int err;
	294	int copied;
	295
	296	err = -EAGAIN;
	297	skb = skb_dequeue(&sk->sk_error_queue);
	298	if (skb == NULL)
	299	goto out;
	300
	301	copied = skb->len;
	302	if (copied > len) {
	303	msg->msg_flags \|= MSG_TRUNC;
	304	copied = len;
	305	}
	306	err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
	307	if (err)
	308	goto out_free_skb;
	309
	310	sock_recv_timestamp(msg, sk, skb);
	311
	312	serr = SKB_EXT_ERR(skb);
	313
	314	sin = (struct sockaddr_in6 *)msg->msg_name;
	315	if (sin) {
d56f90a7	316	const unsigned char *nh = skb_network_header(skb);
1da177e4 LT	317	sin->sin6_family = AF_INET6;
1da177e4 LT	318	sin->sin6_flowinfo = 0;
1ab1457c	319	sin->sin6_port = serr->port;
1da177e4 LT	320	sin->sin6_scope_id = 0;
	321	if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
	322	ipv6_addr_copy(&sin->sin6_addr,
d56f90a7	323	(struct in6_addr *)(nh + serr->addr_offset));
1da177e4	324	if (np->sndflow)
d56f90a7 ACM	325	sin->sin6_flowinfo =
	326	((__be32 )(nh + serr->addr_offset - 24) &
	327	IPV6_FLOWINFO_MASK);
1da177e4 LT	328	if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
	329	sin->sin6_scope_id = IP6CB(skb)->iif;
	330	} else {
	331	ipv6_addr_set(&sin->sin6_addr, 0, 0,
	332	htonl(0xffff),
d56f90a7	333	(__be32 )(nh + serr->addr_offset));
1da177e4 LT	334	}
	335	}
	336
	337	memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
	338	sin = &errhdr.offender;
	339	sin->sin6_family = AF_UNSPEC;
	340	if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
	341	sin->sin6_family = AF_INET6;
	342	sin->sin6_flowinfo = 0;
	343	sin->sin6_scope_id = 0;
	344	if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
0660e03f	345	ipv6_addr_copy(&sin->sin6_addr, &ipv6_hdr(skb)->saddr);
1da177e4 LT	346	if (np->rxopt.all)
	347	datagram_recv_ctl(sk, msg, skb);
	348	if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
	349	sin->sin6_scope_id = IP6CB(skb)->iif;
	350	} else {
	351	struct inet_sock *inet = inet_sk(sk);
	352
	353	ipv6_addr_set(&sin->sin6_addr, 0, 0,
eddc9ec5	354	htonl(0xffff), ip_hdr(skb)->saddr);
1da177e4 LT	355	if (inet->cmsg_flags)
	356	ip_cmsg_recv(msg, skb);
	357	}
	358	}
	359
	360	put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
	361
	362	/* Now we could try to dump offended packet options */
	363
	364	msg->msg_flags \|= MSG_ERRQUEUE;
	365	err = copied;
	366
	367	/* Reset and regenerate socket error */
e0f9f858	368	spin_lock_bh(&sk->sk_error_queue.lock);
1da177e4 LT	369	sk->sk_err = 0;
	370	if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
	371	sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
e0f9f858	372	spin_unlock_bh(&sk->sk_error_queue.lock);
1da177e4 LT	373	sk->sk_error_report(sk);
1da177e4 LT	374	} else {
e0f9f858	375	spin_unlock_bh(&sk->sk_error_queue.lock);
1da177e4 LT	376	}
1da177e4 LT	377
1ab1457c	378	out_free_skb:
1da177e4 LT	379	kfree_skb(skb);
	380	out:
	381	return err;
	382	}
	383
	384
	385
	386	int datagram_recv_ctl(struct sock sk, struct msghdr msg, struct sk_buff *skb)
	387	{
	388	struct ipv6_pinfo *np = inet6_sk(sk);
	389	struct inet6_skb_parm *opt = IP6CB(skb);
d56f90a7	390	unsigned char *nh = skb_network_header(skb);
1da177e4 LT	391
	392	if (np->rxopt.bits.rxinfo) {
	393	struct in6_pktinfo src_info;
	394
	395	src_info.ipi6_ifindex = opt->iif;
0660e03f	396	ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr);
1da177e4 LT	397	put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
	398	}
	399
	400	if (np->rxopt.bits.rxhlim) {
0660e03f	401	int hlim = ipv6_hdr(skb)->hop_limit;
1da177e4 LT	402	put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
	403	}
	404
41a1f8ea	405	if (np->rxopt.bits.rxtclass) {
0660e03f	406	int tclass = (ntohl((__be32 )ipv6_hdr(skb)) >> 20) & 0xff;
41a1f8ea YH	407	put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
	408	}
	409
d56f90a7 ACM	410	if (np->rxopt.bits.rxflow && ((__be32 )nh & IPV6_FLOWINFO_MASK)) {
d56f90a7 ACM	411	__be32 flowinfo = (__be32 )nh & IPV6_FLOWINFO_MASK;
1da177e4 LT	412	put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1da177e4 LT	413	}
333fad53 YH	414
333fad53 YH	415	/* HbH is allowed only once */
1da177e4	416	if (np->rxopt.bits.hopopts && opt->hop) {
d56f90a7	417	u8 *ptr = nh + opt->hop;
1da177e4 LT	418	put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
1da177e4 LT	419	}
333fad53 YH	420
	421	if (opt->lastopt &&
	422	(np->rxopt.bits.dstopts \|\| np->rxopt.bits.srcrt)) {
	423	/*
	424	* Silly enough, but we need to reparse in order to
	425	* report extension headers (except for HbH)
	426	* in order.
	427	*
1ab1457c	428	* Also note that IPV6_RECVRTHDRDSTOPTS is NOT
333fad53 YH	429	* (and WILL NOT be) defined because
	430	* IPV6_RECVDSTOPTS is more generic. --yoshfuji
	431	*/
	432	unsigned int off = sizeof(struct ipv6hdr);
0660e03f	433	u8 nexthdr = ipv6_hdr(skb)->nexthdr;
333fad53 YH	434
	435	while (off <= opt->lastopt) {
	436	unsigned len;
d56f90a7	437	u8 *ptr = nh + off;
333fad53 YH	438
	439	switch(nexthdr) {
	440	case IPPROTO_DSTOPTS:
	441	nexthdr = ptr[0];
	442	len = (ptr[1] + 1) << 3;
	443	if (np->rxopt.bits.dstopts)
	444	put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
	445	break;
	446	case IPPROTO_ROUTING:
	447	nexthdr = ptr[0];
	448	len = (ptr[1] + 1) << 3;
	449	if (np->rxopt.bits.srcrt)
	450	put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
	451	break;
	452	case IPPROTO_AH:
	453	nexthdr = ptr[0];
a3059893	454	len = (ptr[1] + 2) << 2;
333fad53 YH	455	break;
	456	default:
	457	nexthdr = ptr[0];
	458	len = (ptr[1] + 1) << 3;
	459	break;
	460	}
	461
	462	off += len;
	463	}
	464	}
	465
	466	/* socket options in old style */
	467	if (np->rxopt.bits.rxoinfo) {
	468	struct in6_pktinfo src_info;
	469
	470	src_info.ipi6_ifindex = opt->iif;
0660e03f	471	ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr);
333fad53 YH	472	put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
	473	}
	474	if (np->rxopt.bits.rxohlim) {
0660e03f	475	int hlim = ipv6_hdr(skb)->hop_limit;
333fad53 YH	476	put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
	477	}
	478	if (np->rxopt.bits.ohopopts && opt->hop) {
d56f90a7	479	u8 *ptr = nh + opt->hop;
333fad53 YH	480	put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
	481	}
	482	if (np->rxopt.bits.odstopts && opt->dst0) {
d56f90a7	483	u8 *ptr = nh + opt->dst0;
333fad53	484	put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
1da177e4	485	}
333fad53	486	if (np->rxopt.bits.osrcrt && opt->srcrt) {
d56f90a7	487	struct ipv6_rt_hdr rthdr = (struct ipv6_rt_hdr )(nh + opt->srcrt);
333fad53	488	put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
1da177e4	489	}
333fad53	490	if (np->rxopt.bits.odstopts && opt->dst1) {
d56f90a7	491	u8 *ptr = nh + opt->dst1;
333fad53	492	put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
1da177e4 LT	493	}
	494	return 0;
	495	}
	496
91e1908f YH	497	int datagram_send_ctl(struct net *net,
91e1908f YH	498	struct msghdr msg, struct flowi fl,
1da177e4	499	struct ipv6_txoptions *opt,
41a1f8ea	500	int hlimit, int tclass)
1da177e4 LT	501	{
	502	struct in6_pktinfo *src_info;
	503	struct cmsghdr *cmsg;
	504	struct ipv6_rt_hdr *rthdr;
	505	struct ipv6_opt_hdr *hdr;
	506	int len;
	507	int err = 0;
	508
	509	for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
	510	int addr_type;
1da177e4 LT	511
	512	if (!CMSG_OK(msg, cmsg)) {
	513	err = -EINVAL;
	514	goto exit_f;
	515	}
	516
	517	if (cmsg->cmsg_level != SOL_IPV6)
	518	continue;
	519
	520	switch (cmsg->cmsg_type) {
1ab1457c YH	521	case IPV6_PKTINFO:
1ab1457c YH	522	case IPV6_2292PKTINFO:
187e3838 YH	523	{
	524	struct net_device *dev = NULL;
	525
1ab1457c	526	if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
1da177e4 LT	527	err = -EINVAL;
	528	goto exit_f;
	529	}
	530
	531	src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
1ab1457c	532
1da177e4 LT	533	if (src_info->ipi6_ifindex) {
	534	if (fl->oif && src_info->ipi6_ifindex != fl->oif)
	535	return -EINVAL;
	536	fl->oif = src_info->ipi6_ifindex;
	537	}
	538
187e3838	539	addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
1da177e4	540
187e3838	541	if (fl->oif) {
91e1908f	542	dev = dev_get_by_index(net, fl->oif);
187e3838 YH	543	if (!dev)
	544	return -ENODEV;
	545	} else if (addr_type & IPV6_ADDR_LINKLOCAL)
	546	return -EINVAL;
1ab1457c	547
187e3838 YH	548	if (addr_type != IPV6_ADDR_ANY) {
187e3838 YH	549	int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
91e1908f	550	if (!ipv6_chk_addr(net, &src_info->ipi6_addr,
187e3838 YH	551	strict ? dev : NULL, 0))
	552	err = -EINVAL;
	553	else
	554	ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr);
1da177e4	555	}
187e3838	556
1da177e4 LT	557	if (dev)
	558	dev_put(dev);
	559
187e3838 YH	560	if (err)
	561	goto exit_f;
	562
1da177e4	563	break;
187e3838	564	}
1da177e4 LT	565
1da177e4 LT	566	case IPV6_FLOWINFO:
1ab1457c	567	if (cmsg->cmsg_len < CMSG_LEN(4)) {
1da177e4 LT	568	err = -EINVAL;
	569	goto exit_f;
	570	}
	571
	572	if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) {
90bcaf7b	573	if ((fl->fl6_flowlabel^(__be32 )CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
1da177e4 LT	574	err = -EINVAL;
	575	goto exit_f;
	576	}
	577	}
90bcaf7b	578	fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & (__be32 )CMSG_DATA(cmsg);
1da177e4 LT	579	break;
1da177e4 LT	580
333fad53	581	case IPV6_2292HOPOPTS:
1da177e4	582	case IPV6_HOPOPTS:
1ab1457c	583	if (opt->hopopt \|\| cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
1da177e4 LT	584	err = -EINVAL;
	585	goto exit_f;
	586	}
	587
	588	hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
	589	len = ((hdr->hdrlen + 1) << 3);
	590	if (cmsg->cmsg_len < CMSG_LEN(len)) {
	591	err = -EINVAL;
	592	goto exit_f;
	593	}
	594	if (!capable(CAP_NET_RAW)) {
	595	err = -EPERM;
	596	goto exit_f;
	597	}
	598	opt->opt_nflen += len;
	599	opt->hopopt = hdr;
	600	break;
	601
333fad53	602	case IPV6_2292DSTOPTS:
1ab1457c	603	if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
1da177e4 LT	604	err = -EINVAL;
	605	goto exit_f;
	606	}
	607
	608	hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
	609	len = ((hdr->hdrlen + 1) << 3);
	610	if (cmsg->cmsg_len < CMSG_LEN(len)) {
	611	err = -EINVAL;
	612	goto exit_f;
	613	}
	614	if (!capable(CAP_NET_RAW)) {
	615	err = -EPERM;
	616	goto exit_f;
	617	}
	618	if (opt->dst1opt) {
	619	err = -EINVAL;
	620	goto exit_f;
	621	}
	622	opt->opt_flen += len;
	623	opt->dst1opt = hdr;
	624	break;
	625
333fad53 YH	626	case IPV6_DSTOPTS:
	627	case IPV6_RTHDRDSTOPTS:
	628	if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
	629	err = -EINVAL;
	630	goto exit_f;
	631	}
	632
	633	hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
	634	len = ((hdr->hdrlen + 1) << 3);
	635	if (cmsg->cmsg_len < CMSG_LEN(len)) {
	636	err = -EINVAL;
	637	goto exit_f;
	638	}
	639	if (!capable(CAP_NET_RAW)) {
	640	err = -EPERM;
	641	goto exit_f;
	642	}
	643	if (cmsg->cmsg_type == IPV6_DSTOPTS) {
	644	opt->opt_flen += len;
	645	opt->dst1opt = hdr;
	646	} else {
	647	opt->opt_nflen += len;
	648	opt->dst0opt = hdr;
	649	}
	650	break;
	651
	652	case IPV6_2292RTHDR:
1da177e4	653	case IPV6_RTHDR:
1ab1457c	654	if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
1da177e4 LT	655	err = -EINVAL;
	656	goto exit_f;
	657	}
	658
	659	rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
	660
280a9d34	661	switch (rthdr->type) {
59fbb3a6	662	#if defined(CONFIG_IPV6_MIP6) \|\| defined(CONFIG_IPV6_MIP6_MODULE)
280a9d34	663	case IPV6_SRCRT_TYPE_2:
280a9d34	664	break;
bb4dbf9e	665	#endif
280a9d34	666	default:
1da177e4 LT	667	err = -EINVAL;
	668	goto exit_f;
	669	}
	670
	671	len = ((rthdr->hdrlen + 1) << 3);
	672
1ab1457c	673	if (cmsg->cmsg_len < CMSG_LEN(len)) {
1da177e4 LT	674	err = -EINVAL;
	675	goto exit_f;
	676	}
	677
	678	/* segments left must also match */
	679	if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
	680	err = -EINVAL;
	681	goto exit_f;
	682	}
	683
	684	opt->opt_nflen += len;
	685	opt->srcrt = rthdr;
	686
333fad53	687	if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
1da177e4 LT	688	int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
	689
	690	opt->opt_nflen += dsthdrlen;
	691	opt->dst0opt = opt->dst1opt;
	692	opt->dst1opt = NULL;
	693	opt->opt_flen -= dsthdrlen;
	694	}
	695
	696	break;
	697
333fad53	698	case IPV6_2292HOPLIMIT:
1da177e4 LT	699	case IPV6_HOPLIMIT:
	700	if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
	701	err = -EINVAL;
	702	goto exit_f;
	703	}
	704
	705	hlimit = (int *)CMSG_DATA(cmsg);
e8766fc8 SW	706	if (hlimit < -1 \|\| hlimit > 0xff) {
	707	err = -EINVAL;
	708	goto exit_f;
	709	}
	710
1da177e4 LT	711	break;
1da177e4 LT	712
41a1f8ea YH	713	case IPV6_TCLASS:
	714	{
	715	int tc;
	716
	717	err = -EINVAL;
	718	if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
	719	goto exit_f;
	720	}
	721
	722	tc = (int )CMSG_DATA(cmsg);
d0ee011f	723	if (tc < -1 \|\| tc > 0xff)
41a1f8ea YH	724	goto exit_f;
	725
	726	err = 0;
	727	*tclass = tc;
	728
	729	break;
	730	}
1da177e4	731	default:
64ce2073	732	LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",
1ab1457c	733	cmsg->cmsg_type);
1da177e4	734	err = -EINVAL;
4a36702e	735	goto exit_f;
3ff50b79	736	}
1da177e4 LT	737	}
	738
	739	exit_f:
	740	return err;
	741	}