datagram.c 22.9 KB
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/*
 *	common UDP/RAW code
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 *	Linux INET6 implementation
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 *
 *	Authors:
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 *	Pedro Roque		<roque@di.fc.ul.pt>
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 *
 *	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.
 */

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#include <linux/capability.h>
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#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>
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#include <linux/slab.h>
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#include <linux/export.h>
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#include <net/ipv6.h>
#include <net/ndisc.h>
#include <net/addrconf.h>
#include <net/transp_v6.h>
#include <net/ip6_route.h>
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#include <net/tcp_states.h>
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#include <net/dsfield.h>
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#include <linux/errqueue.h>
#include <asm/uaccess.h>

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static bool ipv6_mapped_addr_any(const struct in6_addr *a)
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{
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	return ipv6_addr_v4mapped(a) && (a->s6_addr32[3] == 0);
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}

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int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
{
	struct sockaddr_in6	*usin = (struct sockaddr_in6 *) uaddr;
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	struct inet_sock	*inet = inet_sk(sk);
	struct ipv6_pinfo	*np = inet6_sk(sk);
	struct in6_addr	*daddr, *final_p, final;
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	struct dst_entry	*dst;
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	struct flowi6		fl6;
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	struct ip6_flowlabel	*flowlabel = NULL;
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	struct ipv6_txoptions	*opt;
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	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)
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		return -EINVAL;
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	if (usin->sin6_family != AF_INET6)
		return -EAFNOSUPPORT;
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	memset(&fl6, 0, sizeof(fl6));
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	if (np->sndflow) {
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		fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
		if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
			flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
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			if (!flowlabel)
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				return -EINVAL;
		}
	}

	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;

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		err = ip4_datagram_connect(sk,
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					   (struct sockaddr *) &sin,
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					   sizeof(sin));

ipv4_connected:
		if (err)
			goto out;
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		ipv6_addr_set_v4mapped(inet->inet_daddr, &sk->sk_v6_daddr);
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		if (ipv6_addr_any(&np->saddr) ||
		    ipv6_mapped_addr_any(&np->saddr))
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			ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
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		if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) ||
		    ipv6_mapped_addr_any(&sk->sk_v6_rcv_saddr)) {
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			ipv6_addr_set_v4mapped(inet->inet_rcv_saddr,
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					       &sk->sk_v6_rcv_saddr);
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			if (sk->sk_prot->rehash)
				sk->sk_prot->rehash(sk);
		}
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		goto out;
	}

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	if (__ipv6_addr_needs_scope_id(addr_type)) {
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		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;
		}

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		if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST))
			sk->sk_bound_dev_if = np->mcast_oif;

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		/* Connect to link-local address requires an interface */
		if (!sk->sk_bound_dev_if) {
			err = -EINVAL;
			goto out;
		}
	}

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	sk->sk_v6_daddr = *daddr;
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	np->flow_label = fl6.flowlabel;
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	inet->inet_dport = usin->sin6_port;
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	/*
	 *	Check for a route to destination an obtain the
	 *	destination cache for it.
	 */

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	fl6.flowi6_proto = sk->sk_protocol;
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	fl6.daddr = sk->sk_v6_daddr;
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	fl6.saddr = np->saddr;
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	fl6.flowi6_oif = sk->sk_bound_dev_if;
	fl6.flowi6_mark = sk->sk_mark;
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	fl6.fl6_dport = inet->inet_dport;
	fl6.fl6_sport = inet->inet_sport;
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	if (!fl6.flowi6_oif && (addr_type&IPV6_ADDR_MULTICAST))
		fl6.flowi6_oif = np->mcast_oif;
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	security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
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	opt = flowlabel ? flowlabel->opt : np->opt;
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	final_p = fl6_update_dst(&fl6, opt, &final);
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	dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
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	err = 0;
	if (IS_ERR(dst)) {
		err = PTR_ERR(dst);
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		goto out;
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	}
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	/* source address lookup done in ip6_dst_lookup */

	if (ipv6_addr_any(&np->saddr))
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		np->saddr = fl6.saddr;
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	if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
		sk->sk_v6_rcv_saddr = fl6.saddr;
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		inet->inet_rcv_saddr = LOOPBACK4_IPV6;
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		if (sk->sk_prot->rehash)
			sk->sk_prot->rehash(sk);
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	}

	ip6_dst_store(sk, dst,
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		      ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ?
		      &sk->sk_v6_daddr : NULL,
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#ifdef CONFIG_IPV6_SUBTREES
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		      ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
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		      &np->saddr :
#endif
		      NULL);
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	sk->sk_state = TCP_ESTABLISHED;
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	ip6_set_txhash(sk);
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out:
	fl6_sock_release(flowlabel);
	return err;
}
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EXPORT_SYMBOL_GPL(ip6_datagram_connect);
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int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr,
				 int addr_len)
{
	DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr);
	if (sin6->sin6_family != AF_INET6)
		return -EAFNOSUPPORT;
	return ip6_datagram_connect(sk, uaddr, addr_len);
}
EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only);

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void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
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		     __be16 port, u32 info, u8 *payload)
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{
	struct ipv6_pinfo *np  = inet6_sk(sk);
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	struct icmp6hdr *icmph = icmp6_hdr(skb);
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	struct sock_exterr_skb *serr;

	if (!np->recverr)
		return;

	skb = skb_clone(skb, GFP_ATOMIC);
	if (!skb)
		return;

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	skb->protocol = htons(ETH_P_IPV6);

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	serr = SKB_EXT_ERR(skb);
	serr->ee.ee_errno = err;
	serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
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	serr->ee.ee_type = icmph->icmp6_type;
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	serr->ee.ee_code = icmph->icmp6_code;
	serr->ee.ee_pad = 0;
	serr->ee.ee_info = info;
	serr->ee.ee_data = 0;
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	serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) -
				  skb_network_header(skb);
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	serr->port = port;

	__skb_pull(skb, payload - skb->data);
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	skb_reset_transport_header(skb);
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	if (sock_queue_err_skb(sk, skb))
		kfree_skb(skb);
}

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void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info)
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{
	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;

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	skb->protocol = htons(ETH_P_IPV6);

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	skb_put(skb, sizeof(struct ipv6hdr));
	skb_reset_network_header(skb);
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	iph = ipv6_hdr(skb);
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	iph->daddr = fl6->daddr;
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	serr = SKB_EXT_ERR(skb);
	serr->ee.ee_errno = err;
	serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
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	serr->ee.ee_type = 0;
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	serr->ee.ee_code = 0;
	serr->ee.ee_pad = 0;
	serr->ee.ee_info = info;
	serr->ee.ee_data = 0;
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	serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
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	serr->port = fl6->fl6_dport;
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	__skb_pull(skb, skb_tail_pointer(skb) - skb->data);
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	skb_reset_transport_header(skb);
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	if (sock_queue_err_skb(sk, skb))
		kfree_skb(skb);
}

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void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu)
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{
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct ipv6hdr *iph;
	struct sk_buff *skb;
	struct ip6_mtuinfo *mtu_info;

	if (!np->rxopt.bits.rxpmtu)
		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);
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	iph->daddr = fl6->daddr;
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	mtu_info = IP6CBMTU(skb);

	mtu_info->ip6m_mtu = mtu;
	mtu_info->ip6m_addr.sin6_family = AF_INET6;
	mtu_info->ip6m_addr.sin6_port = 0;
	mtu_info->ip6m_addr.sin6_flowinfo = 0;
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	mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif;
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	mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr;
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	__skb_pull(skb, skb_tail_pointer(skb) - skb->data);
	skb_reset_transport_header(skb);

	skb = xchg(&np->rxpmtu, skb);
	kfree_skb(skb);
}

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/* For some errors we have valid addr_offset even with zero payload and
 * zero port. Also, addr_offset should be supported if port is set.
 */
static inline bool ipv6_datagram_support_addr(struct sock_exterr_skb *serr)
{
	return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6 ||
	       serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
	       serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port;
}

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/* IPv6 supports cmsg on all origins aside from SO_EE_ORIGIN_LOCAL.
 *
 * At one point, excluding local errors was a quick test to identify icmp/icmp6
 * errors. This is no longer true, but the test remained, so the v6 stack,
 * unlike v4, also honors cmsg requests on all wifi and timestamp errors.
 *
 * Timestamp code paths do not initialize the fields expected by cmsg:
 * the PKTINFO fields in skb->cb[]. Fill those in here.
 */
static bool ip6_datagram_support_cmsg(struct sk_buff *skb,
				      struct sock_exterr_skb *serr)
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{
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	if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
	    serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6)
		return true;

	if (serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL)
		return false;

	if (!skb->dev)
		return false;
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	if (skb->protocol == htons(ETH_P_IPV6))
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		IP6CB(skb)->iif = skb->dev->ifindex;
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	else
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		PKTINFO_SKB_CB(skb)->ipi_ifindex = skb->dev->ifindex;

	return true;
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}

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/*
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 *	Handle MSG_ERRQUEUE
 */
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int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
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{
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct sock_exterr_skb *serr;
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	struct sk_buff *skb;
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	DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
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	struct {
		struct sock_extended_err ee;
		struct sockaddr_in6	 offender;
	} errhdr;
	int err;
	int copied;

	err = -EAGAIN;
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	skb = sock_dequeue_err_skb(sk);
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	if (!skb)
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		goto out;

	copied = skb->len;
	if (copied > len) {
		msg->msg_flags |= MSG_TRUNC;
		copied = len;
	}
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	err = skb_copy_datagram_msg(skb, 0, msg, copied);
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	if (err)
		goto out_free_skb;

	sock_recv_timestamp(msg, sk, skb);

	serr = SKB_EXT_ERR(skb);

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	if (sin && ipv6_datagram_support_addr(serr)) {
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		const unsigned char *nh = skb_network_header(skb);
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		sin->sin6_family = AF_INET6;
		sin->sin6_flowinfo = 0;
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		sin->sin6_port = serr->port;
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		if (skb->protocol == htons(ETH_P_IPV6)) {
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			const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset),
								  struct ipv6hdr, daddr);
			sin->sin6_addr = ip6h->daddr;
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			if (np->sndflow)
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				sin->sin6_flowinfo = ip6_flowinfo(ip6h);
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			sin->sin6_scope_id =
				ipv6_iface_scope_id(&sin->sin6_addr,
						    IP6CB(skb)->iif);
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		} else {
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			ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
					       &sin->sin6_addr);
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			sin->sin6_scope_id = 0;
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		}
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		*addr_len = sizeof(*sin);
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	}

	memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
	sin = &errhdr.offender;
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	memset(sin, 0, sizeof(*sin));
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	if (ip6_datagram_support_cmsg(skb, serr)) {
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		sin->sin6_family = AF_INET6;
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		if (np->rxopt.all)
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			ip6_datagram_recv_common_ctl(sk, msg, skb);
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		if (skb->protocol == htons(ETH_P_IPV6)) {
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			sin->sin6_addr = ipv6_hdr(skb)->saddr;
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			if (np->rxopt.all)
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				ip6_datagram_recv_specific_ctl(sk, msg, skb);
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			sin->sin6_scope_id =
				ipv6_iface_scope_id(&sin->sin6_addr,
						    IP6CB(skb)->iif);
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		} else {
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			ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
					       &sin->sin6_addr);
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			if (inet_sk(sk)->cmsg_flags)
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				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;

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out_free_skb:
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	kfree_skb(skb);
out:
	return err;
}
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EXPORT_SYMBOL_GPL(ipv6_recv_error);
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/*
 *	Handle IPV6_RECVPATHMTU
 */
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int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
		     int *addr_len)
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{
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct sk_buff *skb;
	struct ip6_mtuinfo mtu_info;
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	DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
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	int err;
	int copied;

	err = -EAGAIN;
	skb = xchg(&np->rxpmtu, NULL);
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	if (!skb)
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		goto out;

	copied = skb->len;
	if (copied > len) {
		msg->msg_flags |= MSG_TRUNC;
		copied = len;
	}
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	err = skb_copy_datagram_msg(skb, 0, msg, copied);
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	if (err)
		goto out_free_skb;

	sock_recv_timestamp(msg, sk, skb);

	memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info));

	if (sin) {
		sin->sin6_family = AF_INET6;
		sin->sin6_flowinfo = 0;
		sin->sin6_port = 0;
		sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id;
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		sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr;
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		*addr_len = sizeof(*sin);
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	}

	put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info);

	err = copied;

out_free_skb:
	kfree_skb(skb);
out:
	return err;
}
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void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg,
				 struct sk_buff *skb)
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{
	struct ipv6_pinfo *np = inet6_sk(sk);
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	bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6);
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	if (np->rxopt.bits.rxinfo) {
		struct in6_pktinfo src_info;

521 522 523 524 525 526 527 528 529
		if (is_ipv6) {
			src_info.ipi6_ifindex = IP6CB(skb)->iif;
			src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
		} else {
			src_info.ipi6_ifindex =
				PKTINFO_SKB_CB(skb)->ipi_ifindex;
			ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
					       &src_info.ipi6_addr);
		}
530 531 532 533

		if (src_info.ipi6_ifindex >= 0)
			put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO,
				 sizeof(src_info), &src_info);
L
Linus Torvalds 已提交
534
	}
535 536 537 538 539 540 541 542
}

void ip6_datagram_recv_specific_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);
L
Linus Torvalds 已提交
543 544

	if (np->rxopt.bits.rxhlim) {
545
		int hlim = ipv6_hdr(skb)->hop_limit;
L
Linus Torvalds 已提交
546 547 548
		put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
	}

549
	if (np->rxopt.bits.rxtclass) {
550
		int tclass = ipv6_get_dsfield(ipv6_hdr(skb));
551 552 553
		put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
	}

554 555 556 557
	if (np->rxopt.bits.rxflow) {
		__be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh);
		if (flowinfo)
			put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
L
Linus Torvalds 已提交
558
	}
559 560

	/* HbH is allowed only once */
L
Linus Torvalds 已提交
561
	if (np->rxopt.bits.hopopts && opt->hop) {
562
		u8 *ptr = nh + opt->hop;
L
Linus Torvalds 已提交
563 564
		put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
	}
565 566 567 568 569 570 571 572

	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.
		 *
573
		 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
574 575 576 577
		 * (and WILL NOT be) defined because
		 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
		 */
		unsigned int off = sizeof(struct ipv6hdr);
578
		u8 nexthdr = ipv6_hdr(skb)->nexthdr;
579 580

		while (off <= opt->lastopt) {
581
			unsigned int len;
582
			u8 *ptr = nh + off;
583

584
			switch (nexthdr) {
585 586 587 588 589 590 591 592 593 594 595 596 597 598
			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];
599
				len = (ptr[1] + 2) << 2;
600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615
				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;
A
Alexey Dobriyan 已提交
616
		src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
617 618 619
		put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
	}
	if (np->rxopt.bits.rxohlim) {
620
		int hlim = ipv6_hdr(skb)->hop_limit;
621 622 623
		put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
	}
	if (np->rxopt.bits.ohopopts && opt->hop) {
624
		u8 *ptr = nh + opt->hop;
625 626 627
		put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
	}
	if (np->rxopt.bits.odstopts && opt->dst0) {
628
		u8 *ptr = nh + opt->dst0;
629
		put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
L
Linus Torvalds 已提交
630
	}
631
	if (np->rxopt.bits.osrcrt && opt->srcrt) {
632
		struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
633
		put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
L
Linus Torvalds 已提交
634
	}
635
	if (np->rxopt.bits.odstopts && opt->dst1) {
636
		u8 *ptr = nh + opt->dst1;
637
		put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
L
Linus Torvalds 已提交
638
	}
639 640
	if (np->rxopt.bits.rxorigdstaddr) {
		struct sockaddr_in6 sin6;
E
Eric Dumazet 已提交
641
		__be16 *ports = (__be16 *) skb_transport_header(skb);
642 643 644 645 646 647 648 649

		if (skb_transport_offset(skb) + 4 <= skb->len) {
			/* All current transport protocols have the port numbers in the
			 * first four bytes of the transport header and this function is
			 * written with this assumption in mind.
			 */

			sin6.sin6_family = AF_INET6;
A
Alexey Dobriyan 已提交
650
			sin6.sin6_addr = ipv6_hdr(skb)->daddr;
651 652
			sin6.sin6_port = ports[1];
			sin6.sin6_flowinfo = 0;
653 654 655
			sin6.sin6_scope_id =
				ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr,
						    opt->iif);
656 657 658 659

			put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6);
		}
	}
660 661 662 663 664 665 666
}

void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
			  struct sk_buff *skb)
{
	ip6_datagram_recv_common_ctl(sk, msg, skb);
	ip6_datagram_recv_specific_ctl(sk, msg, skb);
L
Linus Torvalds 已提交
667
}
T
Tom Parkin 已提交
668
EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl);
L
Linus Torvalds 已提交
669

670 671 672 673
int ip6_datagram_send_ctl(struct net *net, struct sock *sk,
			  struct msghdr *msg, struct flowi6 *fl6,
			  struct ipv6_txoptions *opt,
			  int *hlimit, int *tclass, int *dontfrag)
L
Linus Torvalds 已提交
674 675 676 677 678 679 680 681
{
	struct in6_pktinfo *src_info;
	struct cmsghdr *cmsg;
	struct ipv6_rt_hdr *rthdr;
	struct ipv6_opt_hdr *hdr;
	int len;
	int err = 0;

682
	for_each_cmsghdr(cmsg, msg) {
L
Linus Torvalds 已提交
683 684 685 686 687 688 689 690 691 692 693
		int addr_type;

		if (!CMSG_OK(msg, cmsg)) {
			err = -EINVAL;
			goto exit_f;
		}

		if (cmsg->cmsg_level != SOL_IPV6)
			continue;

		switch (cmsg->cmsg_type) {
694 695
		case IPV6_PKTINFO:
		case IPV6_2292PKTINFO:
696 697 698
		    {
			struct net_device *dev = NULL;

699
			if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
L
Linus Torvalds 已提交
700 701 702 703 704
				err = -EINVAL;
				goto exit_f;
			}

			src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
705

L
Linus Torvalds 已提交
706
			if (src_info->ipi6_ifindex) {
707 708
				if (fl6->flowi6_oif &&
				    src_info->ipi6_ifindex != fl6->flowi6_oif)
L
Linus Torvalds 已提交
709
					return -EINVAL;
710
				fl6->flowi6_oif = src_info->ipi6_ifindex;
L
Linus Torvalds 已提交
711 712
			}

713
			addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
L
Linus Torvalds 已提交
714

715
			rcu_read_lock();
716 717
			if (fl6->flowi6_oif) {
				dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
718 719
				if (!dev) {
					rcu_read_unlock();
720
					return -ENODEV;
721 722 723
				}
			} else if (addr_type & IPV6_ADDR_LINKLOCAL) {
				rcu_read_unlock();
724
				return -EINVAL;
725
			}
726

727 728
			if (addr_type != IPV6_ADDR_ANY) {
				int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
729
				if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) &&
730
				    !ipv6_chk_addr(net, &src_info->ipi6_addr,
731 732 733
						   strict ? dev : NULL, 0) &&
				    !ipv6_chk_acast_addr_src(net, dev,
							     &src_info->ipi6_addr))
734 735
					err = -EINVAL;
				else
A
Alexey Dobriyan 已提交
736
					fl6->saddr = src_info->ipi6_addr;
L
Linus Torvalds 已提交
737
			}
738

739
			rcu_read_unlock();
L
Linus Torvalds 已提交
740

741 742 743
			if (err)
				goto exit_f;

L
Linus Torvalds 已提交
744
			break;
745
		    }
L
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746 747

		case IPV6_FLOWINFO:
748
			if (cmsg->cmsg_len < CMSG_LEN(4)) {
L
Linus Torvalds 已提交
749 750 751 752
				err = -EINVAL;
				goto exit_f;
			}

753 754
			if (fl6->flowlabel&IPV6_FLOWINFO_MASK) {
				if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
L
Linus Torvalds 已提交
755 756 757 758
					err = -EINVAL;
					goto exit_f;
				}
			}
759
			fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
L
Linus Torvalds 已提交
760 761
			break;

762
		case IPV6_2292HOPOPTS:
L
Linus Torvalds 已提交
763
		case IPV6_HOPOPTS:
764
			if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
L
Linus Torvalds 已提交
765 766 767 768 769 770 771 772 773 774
				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;
			}
775
			if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
L
Linus Torvalds 已提交
776 777 778 779 780 781 782
				err = -EPERM;
				goto exit_f;
			}
			opt->opt_nflen += len;
			opt->hopopt = hdr;
			break;

783
		case IPV6_2292DSTOPTS:
784
			if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
L
Linus Torvalds 已提交
785 786 787 788 789 790 791 792 793 794
				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;
			}
795
			if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
L
Linus Torvalds 已提交
796 797 798 799 800 801 802 803 804 805 806
				err = -EPERM;
				goto exit_f;
			}
			if (opt->dst1opt) {
				err = -EINVAL;
				goto exit_f;
			}
			opt->opt_flen += len;
			opt->dst1opt = hdr;
			break;

807 808 809 810 811 812 813 814 815 816 817 818 819
		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;
			}
820
			if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
821 822 823 824 825 826 827 828 829 830 831 832 833
				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:
L
Linus Torvalds 已提交
834
		case IPV6_RTHDR:
835
			if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
L
Linus Torvalds 已提交
836 837 838 839 840 841
				err = -EINVAL;
				goto exit_f;
			}

			rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);

842
			switch (rthdr->type) {
A
Amerigo Wang 已提交
843
#if IS_ENABLED(CONFIG_IPV6_MIP6)
844
			case IPV6_SRCRT_TYPE_2:
B
Brian Haley 已提交
845 846 847 848 849
				if (rthdr->hdrlen != 2 ||
				    rthdr->segments_left != 1) {
					err = -EINVAL;
					goto exit_f;
				}
850
				break;
851
#endif
852
			default:
L
Linus Torvalds 已提交
853 854 855 856 857 858
				err = -EINVAL;
				goto exit_f;
			}

			len = ((rthdr->hdrlen + 1) << 3);

859
			if (cmsg->cmsg_len < CMSG_LEN(len)) {
L
Linus Torvalds 已提交
860 861 862 863 864 865 866 867 868 869 870 871 872
				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;

873
			if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
L
Linus Torvalds 已提交
874 875 876 877 878 879 880 881 882 883
				int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);

				opt->opt_nflen += dsthdrlen;
				opt->dst0opt = opt->dst1opt;
				opt->dst1opt = NULL;
				opt->opt_flen -= dsthdrlen;
			}

			break;

884
		case IPV6_2292HOPLIMIT:
L
Linus Torvalds 已提交
885 886 887 888 889 890 891
		case IPV6_HOPLIMIT:
			if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
				err = -EINVAL;
				goto exit_f;
			}

			*hlimit = *(int *)CMSG_DATA(cmsg);
892 893 894 895 896
			if (*hlimit < -1 || *hlimit > 0xff) {
				err = -EINVAL;
				goto exit_f;
			}

L
Linus Torvalds 已提交
897 898
			break;

899 900 901 902 903
		case IPV6_TCLASS:
		    {
			int tc;

			err = -EINVAL;
904
			if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
905 906 907
				goto exit_f;

			tc = *(int *)CMSG_DATA(cmsg);
908
			if (tc < -1 || tc > 0xff)
909 910 911 912 913
				goto exit_f;

			err = 0;
			*tclass = tc;

914 915 916 917 918 919 920 921
			break;
		    }

		case IPV6_DONTFRAG:
		    {
			int df;

			err = -EINVAL;
922
			if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
923 924 925 926 927 928 929 930 931
				goto exit_f;

			df = *(int *)CMSG_DATA(cmsg);
			if (df < 0 || df > 1)
				goto exit_f;

			err = 0;
			*dontfrag = df;

932 933
			break;
		    }
L
Linus Torvalds 已提交
934
		default:
935 936
			net_dbg_ratelimited("invalid cmsg type: %d\n",
					    cmsg->cmsg_type);
L
Linus Torvalds 已提交
937
			err = -EINVAL;
938
			goto exit_f;
939
		}
L
Linus Torvalds 已提交
940 941 942 943 944
	}

exit_f:
	return err;
}
945
EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl);
946 947 948 949 950 951

void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp,
			     __u16 srcp, __u16 destp, int bucket)
{
	const struct in6_addr *dest, *src;

952 953
	dest  = &sp->sk_v6_daddr;
	src   = &sp->sk_v6_rcv_saddr;
954 955
	seq_printf(seq,
		   "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
956
		   "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n",
957 958 959 960 961 962 963 964 965 966 967 968 969 970 971
		   bucket,
		   src->s6_addr32[0], src->s6_addr32[1],
		   src->s6_addr32[2], src->s6_addr32[3], srcp,
		   dest->s6_addr32[0], dest->s6_addr32[1],
		   dest->s6_addr32[2], dest->s6_addr32[3], destp,
		   sp->sk_state,
		   sk_wmem_alloc_get(sp),
		   sk_rmem_alloc_get(sp),
		   0, 0L, 0,
		   from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
		   0,
		   sock_i_ino(sp),
		   atomic_read(&sp->sk_refcnt), sp,
		   atomic_read(&sp->sk_drops));
}