tcp_ipv6.c 53.4 KB
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/*
 *	TCP over IPv6
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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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 *
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 *	Based on:
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 *	linux/net/ipv4/tcp.c
 *	linux/net/ipv4/tcp_input.c
 *	linux/net/ipv4/tcp_output.c
 *
 *	Fixes:
 *	Hideaki YOSHIFUJI	:	sin6_scope_id support
 *	YOSHIFUJI Hideaki @USAGI and:	Support IPV6_V6ONLY socket option, which
 *	Alexey Kuznetsov		allow both IPv4 and IPv6 sockets to bind
 *					a single port at the same time.
 *	YOSHIFUJI Hideaki @USAGI:	convert /proc/net/tcp6 to seq_file.
 *
 *	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/bottom_half.h>
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#include <linux/module.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/jiffies.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/netdevice.h>
#include <linux/init.h>
#include <linux/jhash.h>
#include <linux/ipsec.h>
#include <linux/times.h>
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#include <linux/slab.h>
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#include <linux/ipv6.h>
#include <linux/icmpv6.h>
#include <linux/random.h>

#include <net/tcp.h>
#include <net/ndisc.h>
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#include <net/inet6_hashtables.h>
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#include <net/inet6_connection_sock.h>
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#include <net/ipv6.h>
#include <net/transp_v6.h>
#include <net/addrconf.h>
#include <net/ip6_route.h>
#include <net/ip6_checksum.h>
#include <net/inet_ecn.h>
#include <net/protocol.h>
#include <net/xfrm.h>
#include <net/snmp.h>
#include <net/dsfield.h>
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#include <net/timewait_sock.h>
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#include <net/netdma.h>
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#include <net/inet_common.h>
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#include <net/secure_seq.h>
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#include <net/tcp_memcontrol.h>
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#include <asm/uaccess.h>

#include <linux/proc_fs.h>
#include <linux/seq_file.h>

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#include <linux/crypto.h>
#include <linux/scatterlist.h>

static void	tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb);
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static void	tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb,
				      struct request_sock *req);
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static int	tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb);
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static void	__tcp_v6_send_check(struct sk_buff *skb,
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				    const struct in6_addr *saddr,
				    const struct in6_addr *daddr);
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static const struct inet_connection_sock_af_ops ipv6_mapped;
static const struct inet_connection_sock_af_ops ipv6_specific;
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#ifdef CONFIG_TCP_MD5SIG
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static const struct tcp_sock_af_ops tcp_sock_ipv6_specific;
static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific;
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#else
static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk,
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						   const struct in6_addr *addr)
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{
	return NULL;
}
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#endif
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static void tcp_v6_hash(struct sock *sk)
{
	if (sk->sk_state != TCP_CLOSE) {
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		if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) {
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			tcp_prot.hash(sk);
			return;
		}
		local_bh_disable();
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		__inet6_hash(sk, NULL);
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		local_bh_enable();
	}
}

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static __inline__ __sum16 tcp_v6_check(int len,
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				   const struct in6_addr *saddr,
				   const struct in6_addr *daddr,
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				   __wsum base)
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{
	return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base);
}

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static __u32 tcp_v6_init_sequence(const struct sk_buff *skb)
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{
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	return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
					    ipv6_hdr(skb)->saddr.s6_addr32,
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					    tcp_hdr(skb)->dest,
					    tcp_hdr(skb)->source);
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}

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static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
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			  int addr_len)
{
	struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
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	struct inet_sock *inet = inet_sk(sk);
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	struct inet_connection_sock *icsk = inet_csk(sk);
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	struct ipv6_pinfo *np = inet6_sk(sk);
	struct tcp_sock *tp = tcp_sk(sk);
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	struct in6_addr *saddr = NULL, *final_p, final;
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	struct rt6_info *rt;
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	struct flowi6 fl6;
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	struct dst_entry *dst;
	int addr_type;
	int err;

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	if (addr_len < SIN6_LEN_RFC2133)
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		return -EINVAL;

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	if (usin->sin6_family != AF_INET6)
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		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;
		IP6_ECN_flow_init(fl6.flowlabel);
		if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
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			struct ip6_flowlabel *flowlabel;
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			flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
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			if (flowlabel == NULL)
				return -EINVAL;
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			usin->sin6_addr = flowlabel->dst;
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			fl6_sock_release(flowlabel);
		}
	}

	/*
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	 *	connect() to INADDR_ANY means loopback (BSD'ism).
	 */

	if(ipv6_addr_any(&usin->sin6_addr))
		usin->sin6_addr.s6_addr[15] = 0x1;
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	addr_type = ipv6_addr_type(&usin->sin6_addr);

	if(addr_type & IPV6_ADDR_MULTICAST)
		return -ENETUNREACH;

	if (addr_type&IPV6_ADDR_LINKLOCAL) {
		if (addr_len >= sizeof(struct sockaddr_in6) &&
		    usin->sin6_scope_id) {
			/* If interface is set while binding, indices
			 * must coincide.
			 */
			if (sk->sk_bound_dev_if &&
			    sk->sk_bound_dev_if != usin->sin6_scope_id)
				return -EINVAL;

			sk->sk_bound_dev_if = usin->sin6_scope_id;
		}

		/* Connect to link-local address requires an interface */
		if (!sk->sk_bound_dev_if)
			return -EINVAL;
	}

	if (tp->rx_opt.ts_recent_stamp &&
	    !ipv6_addr_equal(&np->daddr, &usin->sin6_addr)) {
		tp->rx_opt.ts_recent = 0;
		tp->rx_opt.ts_recent_stamp = 0;
		tp->write_seq = 0;
	}

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	np->daddr = usin->sin6_addr;
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	np->flow_label = fl6.flowlabel;
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	/*
	 *	TCP over IPv4
	 */

	if (addr_type == IPV6_ADDR_MAPPED) {
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		u32 exthdrlen = icsk->icsk_ext_hdr_len;
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		struct sockaddr_in sin;

		SOCK_DEBUG(sk, "connect: ipv4 mapped\n");

		if (__ipv6_only_sock(sk))
			return -ENETUNREACH;

		sin.sin_family = AF_INET;
		sin.sin_port = usin->sin6_port;
		sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];

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		icsk->icsk_af_ops = &ipv6_mapped;
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		sk->sk_backlog_rcv = tcp_v4_do_rcv;
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#ifdef CONFIG_TCP_MD5SIG
		tp->af_specific = &tcp_sock_ipv6_mapped_specific;
#endif
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		err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));

		if (err) {
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			icsk->icsk_ext_hdr_len = exthdrlen;
			icsk->icsk_af_ops = &ipv6_specific;
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			sk->sk_backlog_rcv = tcp_v6_do_rcv;
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#ifdef CONFIG_TCP_MD5SIG
			tp->af_specific = &tcp_sock_ipv6_specific;
#endif
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			goto failure;
		} else {
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			ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
			ipv6_addr_set_v4mapped(inet->inet_rcv_saddr,
					       &np->rcv_saddr);
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		}

		return err;
	}

	if (!ipv6_addr_any(&np->rcv_saddr))
		saddr = &np->rcv_saddr;

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	fl6.flowi6_proto = IPPROTO_TCP;
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	fl6.daddr = np->daddr;
	fl6.saddr = saddr ? *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 = usin->sin6_port;
	fl6.fl6_sport = inet->inet_sport;
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	final_p = fl6_update_dst(&fl6, np->opt, &final);
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	security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
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	dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true);
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	if (IS_ERR(dst)) {
		err = PTR_ERR(dst);
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		goto failure;
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	}
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	if (saddr == NULL) {
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		saddr = &fl6.saddr;
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		np->rcv_saddr = *saddr;
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	}

	/* set the source address */
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	np->saddr = *saddr;
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	inet->inet_rcv_saddr = LOOPBACK4_IPV6;
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	sk->sk_gso_type = SKB_GSO_TCPV6;
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	__ip6_dst_store(sk, dst, NULL, NULL);
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	rt = (struct rt6_info *) dst;
	if (tcp_death_row.sysctl_tw_recycle &&
	    !tp->rx_opt.ts_recent_stamp &&
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	    ipv6_addr_equal(&rt->rt6i_dst.addr, &np->daddr))
		tcp_fetch_timewait_stamp(sk, dst);
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	icsk->icsk_ext_hdr_len = 0;
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	if (np->opt)
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		icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
					  np->opt->opt_nflen);
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	tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);

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	inet->inet_dport = usin->sin6_port;
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	tcp_set_state(sk, TCP_SYN_SENT);
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	err = inet6_hash_connect(&tcp_death_row, sk);
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	if (err)
		goto late_failure;

	if (!tp->write_seq)
		tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32,
							     np->daddr.s6_addr32,
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							     inet->inet_sport,
							     inet->inet_dport);
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	err = tcp_connect(sk);
	if (err)
		goto late_failure;

	return 0;

late_failure:
	tcp_set_state(sk, TCP_CLOSE);
	__sk_dst_reset(sk);
failure:
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	inet->inet_dport = 0;
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	sk->sk_route_caps = 0;
	return err;
}

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static void tcp_v6_mtu_reduced(struct sock *sk)
{
	struct dst_entry *dst;

	if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE))
		return;

	dst = inet6_csk_update_pmtu(sk, tcp_sk(sk)->mtu_info);
	if (!dst)
		return;

	if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
		tcp_sync_mss(sk, dst_mtu(dst));
		tcp_simple_retransmit(sk);
	}
}

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static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
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		u8 type, u8 code, int offset, __be32 info)
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{
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	const struct ipv6hdr *hdr = (const struct ipv6hdr*)skb->data;
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	const struct tcphdr *th = (struct tcphdr *)(skb->data+offset);
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	struct ipv6_pinfo *np;
	struct sock *sk;
	int err;
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	struct tcp_sock *tp;
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	__u32 seq;
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	struct net *net = dev_net(skb->dev);
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	sk = inet6_lookup(net, &tcp_hashinfo, &hdr->daddr,
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			th->dest, &hdr->saddr, th->source, skb->dev->ifindex);
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	if (sk == NULL) {
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		ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
				   ICMP6_MIB_INERRORS);
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		return;
	}

	if (sk->sk_state == TCP_TIME_WAIT) {
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		inet_twsk_put(inet_twsk(sk));
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		return;
	}

	bh_lock_sock(sk);
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	if (sock_owned_by_user(sk) && type != ICMPV6_PKT_TOOBIG)
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		NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS);
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	if (sk->sk_state == TCP_CLOSE)
		goto out;

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	if (ipv6_hdr(skb)->hop_limit < inet6_sk(sk)->min_hopcount) {
		NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP);
		goto out;
	}

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	tp = tcp_sk(sk);
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	seq = ntohl(th->seq);
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	if (sk->sk_state != TCP_LISTEN &&
	    !between(seq, tp->snd_una, tp->snd_nxt)) {
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		NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
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		goto out;
	}

	np = inet6_sk(sk);

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	if (type == NDISC_REDIRECT) {
		struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie);

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		if (dst)
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			dst->ops->redirect(dst, sk, skb);
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	}

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	if (type == ICMPV6_PKT_TOOBIG) {
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		tp->mtu_info = ntohl(info);
		if (!sock_owned_by_user(sk))
			tcp_v6_mtu_reduced(sk);
		else
			set_bit(TCP_MTU_REDUCED_DEFERRED, &tp->tsq_flags);
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		goto out;
	}

	icmpv6_err_convert(type, code, &err);

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	/* Might be for an request_sock */
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	switch (sk->sk_state) {
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		struct request_sock *req, **prev;
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	case TCP_LISTEN:
		if (sock_owned_by_user(sk))
			goto out;

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		req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr,
					   &hdr->saddr, inet6_iif(skb));
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		if (!req)
			goto out;

		/* ICMPs are not backlogged, hence we cannot get
		 * an established socket here.
		 */
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		WARN_ON(req->sk != NULL);
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		if (seq != tcp_rsk(req)->snt_isn) {
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			NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
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			goto out;
		}

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		inet_csk_reqsk_queue_drop(sk, req, prev);
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		goto out;

	case TCP_SYN_SENT:
	case TCP_SYN_RECV:  /* Cannot happen.
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			       It can, it SYNs are crossed. --ANK */
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		if (!sock_owned_by_user(sk)) {
			sk->sk_err = err;
			sk->sk_error_report(sk);		/* Wake people up to see the error (see connect in sock.c) */

			tcp_done(sk);
		} else
			sk->sk_err_soft = err;
		goto out;
	}

	if (!sock_owned_by_user(sk) && np->recverr) {
		sk->sk_err = err;
		sk->sk_error_report(sk);
	} else
		sk->sk_err_soft = err;

out:
	bh_unlock_sock(sk);
	sock_put(sk);
}


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static int tcp_v6_send_synack(struct sock *sk, struct dst_entry *dst,
			      struct flowi6 *fl6,
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			      struct request_sock *req,
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			      struct request_values *rvp,
			      u16 queue_mapping)
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{
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	struct inet6_request_sock *treq = inet6_rsk(req);
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	struct ipv6_pinfo *np = inet6_sk(sk);
	struct sk_buff * skb;
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	int err = -ENOMEM;
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	/* First, grab a route. */
	if (!dst && (dst = inet6_csk_route_req(sk, fl6, req)) == NULL)
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		goto done;
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	skb = tcp_make_synack(sk, dst, req, rvp);
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	if (skb) {
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		__tcp_v6_send_check(skb, &treq->loc_addr, &treq->rmt_addr);
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		fl6->daddr = treq->rmt_addr;
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		skb_set_queue_mapping(skb, queue_mapping);
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		err = ip6_xmit(sk, skb, fl6, np->opt, np->tclass);
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		err = net_xmit_eval(err);
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	}

done:
	return err;
}

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static int tcp_v6_rtx_synack(struct sock *sk, struct request_sock *req,
			     struct request_values *rvp)
{
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	struct flowi6 fl6;

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	TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS);
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	return tcp_v6_send_synack(sk, NULL, &fl6, req, rvp, 0);
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}

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static void tcp_v6_reqsk_destructor(struct request_sock *req)
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{
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	kfree_skb(inet6_rsk(req)->pktopts);
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}

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#ifdef CONFIG_TCP_MD5SIG
static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk,
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						   const struct in6_addr *addr)
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{
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	return tcp_md5_do_lookup(sk, (union tcp_md5_addr *)addr, AF_INET6);
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}

static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk,
						struct sock *addr_sk)
{
	return tcp_v6_md5_do_lookup(sk, &inet6_sk(addr_sk)->daddr);
}

static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk,
						      struct request_sock *req)
{
	return tcp_v6_md5_do_lookup(sk, &inet6_rsk(req)->rmt_addr);
}

static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval,
				  int optlen)
{
	struct tcp_md5sig cmd;
	struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr;

	if (optlen < sizeof(cmd))
		return -EINVAL;

	if (copy_from_user(&cmd, optval, sizeof(cmd)))
		return -EFAULT;

	if (sin6->sin6_family != AF_INET6)
		return -EINVAL;

	if (!cmd.tcpm_keylen) {
B
Brian Haley 已提交
530
		if (ipv6_addr_v4mapped(&sin6->sin6_addr))
E
Eric Dumazet 已提交
531 532 533 534
			return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3],
					      AF_INET);
		return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr,
				      AF_INET6);
535 536 537 538 539
	}

	if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN)
		return -EINVAL;

E
Eric Dumazet 已提交
540 541 542
	if (ipv6_addr_v4mapped(&sin6->sin6_addr))
		return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3],
				      AF_INET, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);
543

E
Eric Dumazet 已提交
544 545
	return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr,
			      AF_INET6, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);
546 547
}

548
static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp,
549 550
					const struct in6_addr *daddr,
					const struct in6_addr *saddr, int nbytes)
551 552
{
	struct tcp6_pseudohdr *bp;
553
	struct scatterlist sg;
554

555 556
	bp = &hp->md5_blk.ip6;
	/* 1. TCP pseudo-header (RFC2460) */
A
Alexey Dobriyan 已提交
557 558
	bp->saddr = *saddr;
	bp->daddr = *daddr;
559
	bp->protocol = cpu_to_be32(IPPROTO_TCP);
A
Adam Langley 已提交
560
	bp->len = cpu_to_be32(nbytes);
561

562 563 564
	sg_init_one(&sg, bp, sizeof(*bp));
	return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp));
}
565

566
static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key,
567
			       const struct in6_addr *daddr, struct in6_addr *saddr,
E
Eric Dumazet 已提交
568
			       const struct tcphdr *th)
569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586
{
	struct tcp_md5sig_pool *hp;
	struct hash_desc *desc;

	hp = tcp_get_md5sig_pool();
	if (!hp)
		goto clear_hash_noput;
	desc = &hp->md5_desc;

	if (crypto_hash_init(desc))
		goto clear_hash;
	if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2))
		goto clear_hash;
	if (tcp_md5_hash_header(hp, th))
		goto clear_hash;
	if (tcp_md5_hash_key(hp, key))
		goto clear_hash;
	if (crypto_hash_final(desc, md5_hash))
587 588 589 590
		goto clear_hash;

	tcp_put_md5sig_pool();
	return 0;
591

592 593 594 595
clear_hash:
	tcp_put_md5sig_pool();
clear_hash_noput:
	memset(md5_hash, 0, 16);
596
	return 1;
597 598
}

599
static int tcp_v6_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key,
E
Eric Dumazet 已提交
600 601 602
			       const struct sock *sk,
			       const struct request_sock *req,
			       const struct sk_buff *skb)
603
{
604
	const struct in6_addr *saddr, *daddr;
605 606
	struct tcp_md5sig_pool *hp;
	struct hash_desc *desc;
E
Eric Dumazet 已提交
607
	const struct tcphdr *th = tcp_hdr(skb);
608 609 610 611

	if (sk) {
		saddr = &inet6_sk(sk)->saddr;
		daddr = &inet6_sk(sk)->daddr;
612
	} else if (req) {
613 614
		saddr = &inet6_rsk(req)->loc_addr;
		daddr = &inet6_rsk(req)->rmt_addr;
615
	} else {
616
		const struct ipv6hdr *ip6h = ipv6_hdr(skb);
617 618
		saddr = &ip6h->saddr;
		daddr = &ip6h->daddr;
619
	}
620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647

	hp = tcp_get_md5sig_pool();
	if (!hp)
		goto clear_hash_noput;
	desc = &hp->md5_desc;

	if (crypto_hash_init(desc))
		goto clear_hash;

	if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len))
		goto clear_hash;
	if (tcp_md5_hash_header(hp, th))
		goto clear_hash;
	if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2))
		goto clear_hash;
	if (tcp_md5_hash_key(hp, key))
		goto clear_hash;
	if (crypto_hash_final(desc, md5_hash))
		goto clear_hash;

	tcp_put_md5sig_pool();
	return 0;

clear_hash:
	tcp_put_md5sig_pool();
clear_hash_noput:
	memset(md5_hash, 0, 16);
	return 1;
648 649
}

E
Eric Dumazet 已提交
650
static int tcp_v6_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb)
651
{
652
	const __u8 *hash_location = NULL;
653
	struct tcp_md5sig_key *hash_expected;
654
	const struct ipv6hdr *ip6h = ipv6_hdr(skb);
E
Eric Dumazet 已提交
655
	const struct tcphdr *th = tcp_hdr(skb);
656 657 658 659
	int genhash;
	u8 newhash[16];

	hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr);
660
	hash_location = tcp_parse_md5sig_option(th);
661

662 663 664 665 666 667
	/* We've parsed the options - do we have a hash? */
	if (!hash_expected && !hash_location)
		return 0;

	if (hash_expected && !hash_location) {
		NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND);
668 669 670
		return 1;
	}

671 672
	if (!hash_expected && hash_location) {
		NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED);
673 674 675 676
		return 1;
	}

	/* check the signature */
677 678 679 680
	genhash = tcp_v6_md5_hash_skb(newhash,
				      hash_expected,
				      NULL, NULL, skb);

681
	if (genhash || memcmp(hash_location, newhash, 16) != 0) {
682 683 684 685
		net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n",
				     genhash ? "failed" : "mismatch",
				     &ip6h->saddr, ntohs(th->source),
				     &ip6h->daddr, ntohs(th->dest));
686 687 688 689 690 691
		return 1;
	}
	return 0;
}
#endif

692
struct request_sock_ops tcp6_request_sock_ops __read_mostly = {
L
Linus Torvalds 已提交
693
	.family		=	AF_INET6,
694
	.obj_size	=	sizeof(struct tcp6_request_sock),
695
	.rtx_syn_ack	=	tcp_v6_rtx_synack,
696 697
	.send_ack	=	tcp_v6_reqsk_send_ack,
	.destructor	=	tcp_v6_reqsk_destructor,
698 699
	.send_reset	=	tcp_v6_send_reset,
	.syn_ack_timeout = 	tcp_syn_ack_timeout,
L
Linus Torvalds 已提交
700 701
};

702
#ifdef CONFIG_TCP_MD5SIG
703
static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = {
704
	.md5_lookup	=	tcp_v6_reqsk_md5_lookup,
705
	.calc_md5_hash	=	tcp_v6_md5_hash_skb,
706
};
707
#endif
708

709
static void __tcp_v6_send_check(struct sk_buff *skb,
710
				const struct in6_addr *saddr, const struct in6_addr *daddr)
L
Linus Torvalds 已提交
711
{
712
	struct tcphdr *th = tcp_hdr(skb);
L
Linus Torvalds 已提交
713

714
	if (skb->ip_summed == CHECKSUM_PARTIAL) {
715
		th->check = ~tcp_v6_check(skb->len, saddr, daddr, 0);
716
		skb->csum_start = skb_transport_header(skb) - skb->head;
A
Al Viro 已提交
717
		skb->csum_offset = offsetof(struct tcphdr, check);
L
Linus Torvalds 已提交
718
	} else {
719 720 721
		th->check = tcp_v6_check(skb->len, saddr, daddr,
					 csum_partial(th, th->doff << 2,
						      skb->csum));
L
Linus Torvalds 已提交
722 723 724
	}
}

725
static void tcp_v6_send_check(struct sock *sk, struct sk_buff *skb)
726 727 728 729 730 731
{
	struct ipv6_pinfo *np = inet6_sk(sk);

	__tcp_v6_send_check(skb, &np->saddr, &np->daddr);
}

732 733
static int tcp_v6_gso_send_check(struct sk_buff *skb)
{
734
	const struct ipv6hdr *ipv6h;
735 736 737 738 739
	struct tcphdr *th;

	if (!pskb_may_pull(skb, sizeof(*th)))
		return -EINVAL;

740
	ipv6h = ipv6_hdr(skb);
741
	th = tcp_hdr(skb);
742 743

	th->check = 0;
744
	skb->ip_summed = CHECKSUM_PARTIAL;
745
	__tcp_v6_send_check(skb, &ipv6h->saddr, &ipv6h->daddr);
746 747
	return 0;
}
L
Linus Torvalds 已提交
748

H
Herbert Xu 已提交
749 750
static struct sk_buff **tcp6_gro_receive(struct sk_buff **head,
					 struct sk_buff *skb)
H
Herbert Xu 已提交
751
{
752
	const struct ipv6hdr *iph = skb_gro_network_header(skb);
H
Herbert Xu 已提交
753 754 755

	switch (skb->ip_summed) {
	case CHECKSUM_COMPLETE:
756
		if (!tcp_v6_check(skb_gro_len(skb), &iph->saddr, &iph->daddr,
H
Herbert Xu 已提交
757 758 759 760 761 762 763 764 765 766 767 768 769 770
				  skb->csum)) {
			skb->ip_summed = CHECKSUM_UNNECESSARY;
			break;
		}

		/* fall through */
	case CHECKSUM_NONE:
		NAPI_GRO_CB(skb)->flush = 1;
		return NULL;
	}

	return tcp_gro_receive(head, skb);
}

H
Herbert Xu 已提交
771
static int tcp6_gro_complete(struct sk_buff *skb)
H
Herbert Xu 已提交
772
{
773
	const struct ipv6hdr *iph = ipv6_hdr(skb);
H
Herbert Xu 已提交
774 775 776 777 778 779 780 781 782
	struct tcphdr *th = tcp_hdr(skb);

	th->check = ~tcp_v6_check(skb->len - skb_transport_offset(skb),
				  &iph->saddr, &iph->daddr, 0);
	skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;

	return tcp_gro_complete(skb);
}

783
static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win,
784
				 u32 ts, struct tcp_md5sig_key *key, int rst, u8 tclass)
L
Linus Torvalds 已提交
785
{
786 787
	const struct tcphdr *th = tcp_hdr(skb);
	struct tcphdr *t1;
L
Linus Torvalds 已提交
788
	struct sk_buff *buff;
789
	struct flowi6 fl6;
E
Eric Dumazet 已提交
790
	struct net *net = dev_net(skb_dst(skb)->dev);
791
	struct sock *ctl_sk = net->ipv6.tcp_sk;
792
	unsigned int tot_len = sizeof(struct tcphdr);
E
Eric Dumazet 已提交
793
	struct dst_entry *dst;
794
	__be32 *topt;
L
Linus Torvalds 已提交
795

796 797
	if (ts)
		tot_len += TCPOLEN_TSTAMP_ALIGNED;
798 799 800 801 802 803
#ifdef CONFIG_TCP_MD5SIG
	if (key)
		tot_len += TCPOLEN_MD5SIG_ALIGNED;
#endif

	buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len,
L
Linus Torvalds 已提交
804
			 GFP_ATOMIC);
805 806
	if (buff == NULL)
		return;
L
Linus Torvalds 已提交
807

808
	skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len);
L
Linus Torvalds 已提交
809

810
	t1 = (struct tcphdr *) skb_push(buff, tot_len);
811
	skb_reset_transport_header(buff);
L
Linus Torvalds 已提交
812 813 814 815 816

	/* Swap the send and the receive. */
	memset(t1, 0, sizeof(*t1));
	t1->dest = th->source;
	t1->source = th->dest;
817
	t1->doff = tot_len / 4;
818 819 820 821 822
	t1->seq = htonl(seq);
	t1->ack_seq = htonl(ack);
	t1->ack = !rst || !th->ack;
	t1->rst = rst;
	t1->window = htons(win);
L
Linus Torvalds 已提交
823

824 825
	topt = (__be32 *)(t1 + 1);

826 827 828 829 830 831 832
	if (ts) {
		*topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
				(TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP);
		*topt++ = htonl(tcp_time_stamp);
		*topt++ = htonl(ts);
	}

833 834
#ifdef CONFIG_TCP_MD5SIG
	if (key) {
835 836 837
		*topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
				(TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG);
		tcp_v6_md5_hash_hdr((__u8 *)topt, key,
838 839
				    &ipv6_hdr(skb)->saddr,
				    &ipv6_hdr(skb)->daddr, t1);
840 841 842
	}
#endif

843
	memset(&fl6, 0, sizeof(fl6));
A
Alexey Dobriyan 已提交
844 845
	fl6.daddr = ipv6_hdr(skb)->saddr;
	fl6.saddr = ipv6_hdr(skb)->daddr;
L
Linus Torvalds 已提交
846

847 848 849
	buff->ip_summed = CHECKSUM_PARTIAL;
	buff->csum = 0;

850
	__tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr);
L
Linus Torvalds 已提交
851

852 853
	fl6.flowi6_proto = IPPROTO_TCP;
	fl6.flowi6_oif = inet6_iif(skb);
854 855
	fl6.fl6_dport = t1->dest;
	fl6.fl6_sport = t1->source;
856
	security_skb_classify_flow(skb, flowi6_to_flowi(&fl6));
L
Linus Torvalds 已提交
857

858 859 860 861
	/* Pass a socket to ip6_dst_lookup either it is for RST
	 * Underlying function will use this to retrieve the network
	 * namespace
	 */
862
	dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL, false);
863 864
	if (!IS_ERR(dst)) {
		skb_dst_set(buff, dst);
865
		ip6_xmit(ctl_sk, buff, &fl6, NULL, tclass);
866 867 868 869
		TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS);
		if (rst)
			TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS);
		return;
L
Linus Torvalds 已提交
870 871 872 873 874
	}

	kfree_skb(buff);
}

875
static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb)
L
Linus Torvalds 已提交
876
{
877
	const struct tcphdr *th = tcp_hdr(skb);
878
	u32 seq = 0, ack_seq = 0;
879
	struct tcp_md5sig_key *key = NULL;
880 881 882 883 884 885 886
#ifdef CONFIG_TCP_MD5SIG
	const __u8 *hash_location = NULL;
	struct ipv6hdr *ipv6h = ipv6_hdr(skb);
	unsigned char newhash[16];
	int genhash;
	struct sock *sk1 = NULL;
#endif
L
Linus Torvalds 已提交
887

888
	if (th->rst)
L
Linus Torvalds 已提交
889 890
		return;

891 892
	if (!ipv6_unicast_destination(skb))
		return;
L
Linus Torvalds 已提交
893

894
#ifdef CONFIG_TCP_MD5SIG
895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920
	hash_location = tcp_parse_md5sig_option(th);
	if (!sk && hash_location) {
		/*
		 * active side is lost. Try to find listening socket through
		 * source port, and then find md5 key through listening socket.
		 * we are not loose security here:
		 * Incoming packet is checked with md5 hash with finding key,
		 * no RST generated if md5 hash doesn't match.
		 */
		sk1 = inet6_lookup_listener(dev_net(skb_dst(skb)->dev),
					   &tcp_hashinfo, &ipv6h->daddr,
					   ntohs(th->source), inet6_iif(skb));
		if (!sk1)
			return;

		rcu_read_lock();
		key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr);
		if (!key)
			goto release_sk1;

		genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, NULL, skb);
		if (genhash || memcmp(hash_location, newhash, 16) != 0)
			goto release_sk1;
	} else {
		key = sk ? tcp_v6_md5_do_lookup(sk, &ipv6h->saddr) : NULL;
	}
921 922
#endif

923 924 925 926 927
	if (th->ack)
		seq = ntohl(th->ack_seq);
	else
		ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len -
			  (th->doff << 2);
L
Linus Torvalds 已提交
928

929
	tcp_v6_send_response(skb, seq, ack_seq, 0, 0, key, 1, 0);
930 931 932 933 934 935 936 937

#ifdef CONFIG_TCP_MD5SIG
release_sk1:
	if (sk1) {
		rcu_read_unlock();
		sock_put(sk1);
	}
#endif
938
}
L
Linus Torvalds 已提交
939

940
static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts,
941
			    struct tcp_md5sig_key *key, u8 tclass)
942
{
943
	tcp_v6_send_response(skb, seq, ack, win, ts, key, 0, tclass);
L
Linus Torvalds 已提交
944 945 946 947
}

static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb)
{
948
	struct inet_timewait_sock *tw = inet_twsk(sk);
949
	struct tcp_timewait_sock *tcptw = tcp_twsk(sk);
L
Linus Torvalds 已提交
950

951
	tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt,
952
			tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale,
953 954
			tcptw->tw_ts_recent, tcp_twsk_md5_key(tcptw),
			tw->tw_tclass);
L
Linus Torvalds 已提交
955

956
	inet_twsk_put(tw);
L
Linus Torvalds 已提交
957 958
}

959 960
static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb,
				  struct request_sock *req)
L
Linus Torvalds 已提交
961
{
962
	tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent,
963
			tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr), 0);
L
Linus Torvalds 已提交
964 965 966 967 968
}


static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
{
969
	struct request_sock *req, **prev;
970
	const struct tcphdr *th = tcp_hdr(skb);
L
Linus Torvalds 已提交
971 972 973
	struct sock *nsk;

	/* Find possible connection requests. */
974
	req = inet6_csk_search_req(sk, &prev, th->source,
975 976
				   &ipv6_hdr(skb)->saddr,
				   &ipv6_hdr(skb)->daddr, inet6_iif(skb));
L
Linus Torvalds 已提交
977 978 979
	if (req)
		return tcp_check_req(sk, skb, req, prev);

980
	nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo,
981 982
			&ipv6_hdr(skb)->saddr, th->source,
			&ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb));
L
Linus Torvalds 已提交
983 984 985 986 987 988

	if (nsk) {
		if (nsk->sk_state != TCP_TIME_WAIT) {
			bh_lock_sock(nsk);
			return nsk;
		}
989
		inet_twsk_put(inet_twsk(nsk));
L
Linus Torvalds 已提交
990 991 992
		return NULL;
	}

993
#ifdef CONFIG_SYN_COOKIES
994
	if (!th->syn)
995
		sk = cookie_v6_check(sk, skb);
L
Linus Torvalds 已提交
996 997 998 999 1000 1001 1002 1003 1004
#endif
	return sk;
}

/* FIXME: this is substantially similar to the ipv4 code.
 * Can some kind of merge be done? -- erics
 */
static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
{
1005
	struct tcp_extend_values tmp_ext;
1006
	struct tcp_options_received tmp_opt;
1007
	const u8 *hash_location;
1008
	struct request_sock *req;
1009
	struct inet6_request_sock *treq;
L
Linus Torvalds 已提交
1010 1011
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct tcp_sock *tp = tcp_sk(sk);
1012
	__u32 isn = TCP_SKB_CB(skb)->when;
1013
	struct dst_entry *dst = NULL;
1014
	struct flowi6 fl6;
E
Eric Dumazet 已提交
1015
	bool want_cookie = false;
L
Linus Torvalds 已提交
1016 1017 1018 1019 1020

	if (skb->protocol == htons(ETH_P_IP))
		return tcp_v4_conn_request(sk, skb);

	if (!ipv6_unicast_destination(skb))
1021
		goto drop;
L
Linus Torvalds 已提交
1022

1023
	if (inet_csk_reqsk_queue_is_full(sk) && !isn) {
1024 1025 1026
		want_cookie = tcp_syn_flood_action(sk, skb, "TCPv6");
		if (!want_cookie)
			goto drop;
L
Linus Torvalds 已提交
1027 1028
	}

1029
	if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
L
Linus Torvalds 已提交
1030 1031
		goto drop;

1032
	req = inet6_reqsk_alloc(&tcp6_request_sock_ops);
L
Linus Torvalds 已提交
1033 1034 1035
	if (req == NULL)
		goto drop;

1036 1037 1038 1039
#ifdef CONFIG_TCP_MD5SIG
	tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops;
#endif

L
Linus Torvalds 已提交
1040 1041 1042
	tcp_clear_options(&tmp_opt);
	tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);
	tmp_opt.user_mss = tp->rx_opt.user_mss;
Y
Yuchung Cheng 已提交
1043
	tcp_parse_options(skb, &tmp_opt, &hash_location, 0, NULL);
1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059

	if (tmp_opt.cookie_plus > 0 &&
	    tmp_opt.saw_tstamp &&
	    !tp->rx_opt.cookie_out_never &&
	    (sysctl_tcp_cookie_size > 0 ||
	     (tp->cookie_values != NULL &&
	      tp->cookie_values->cookie_desired > 0))) {
		u8 *c;
		u32 *d;
		u32 *mess = &tmp_ext.cookie_bakery[COOKIE_DIGEST_WORDS];
		int l = tmp_opt.cookie_plus - TCPOLEN_COOKIE_BASE;

		if (tcp_cookie_generator(&tmp_ext.cookie_bakery[0]) != 0)
			goto drop_and_free;

		/* Secret recipe starts with IP addresses */
1060
		d = (__force u32 *)&ipv6_hdr(skb)->daddr.s6_addr32[0];
1061 1062 1063 1064
		*mess++ ^= *d++;
		*mess++ ^= *d++;
		*mess++ ^= *d++;
		*mess++ ^= *d++;
1065
		d = (__force u32 *)&ipv6_hdr(skb)->saddr.s6_addr32[0];
1066 1067 1068 1069 1070 1071 1072 1073 1074
		*mess++ ^= *d++;
		*mess++ ^= *d++;
		*mess++ ^= *d++;
		*mess++ ^= *d++;

		/* plus variable length Initiator Cookie */
		c = (u8 *)mess;
		while (l-- > 0)
			*c++ ^= *hash_location++;
L
Linus Torvalds 已提交
1075

E
Eric Dumazet 已提交
1076
		want_cookie = false;	/* not our kind of cookie */
1077 1078 1079 1080 1081 1082 1083 1084 1085 1086
		tmp_ext.cookie_out_never = 0; /* false */
		tmp_ext.cookie_plus = tmp_opt.cookie_plus;
	} else if (!tp->rx_opt.cookie_in_always) {
		/* redundant indications, but ensure initialization. */
		tmp_ext.cookie_out_never = 1; /* true */
		tmp_ext.cookie_plus = 0;
	} else {
		goto drop_and_free;
	}
	tmp_ext.cookie_in_always = tp->rx_opt.cookie_in_always;
L
Linus Torvalds 已提交
1087

1088
	if (want_cookie && !tmp_opt.saw_tstamp)
1089 1090
		tcp_clear_options(&tmp_opt);

L
Linus Torvalds 已提交
1091 1092 1093
	tmp_opt.tstamp_ok = tmp_opt.saw_tstamp;
	tcp_openreq_init(req, &tmp_opt, skb);

1094
	treq = inet6_rsk(req);
A
Alexey Dobriyan 已提交
1095 1096
	treq->rmt_addr = ipv6_hdr(skb)->saddr;
	treq->loc_addr = ipv6_hdr(skb)->daddr;
1097
	if (!want_cookie || tmp_opt.tstamp_ok)
1098
		TCP_ECN_create_request(req, skb);
1099

1100 1101 1102 1103 1104 1105 1106
	treq->iif = sk->sk_bound_dev_if;

	/* So that link locals have meaning */
	if (!sk->sk_bound_dev_if &&
	    ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL)
		treq->iif = inet6_iif(skb);

1107
	if (!isn) {
1108 1109 1110 1111 1112 1113
		if (ipv6_opt_accepted(sk, skb) ||
		    np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
		    np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
			atomic_inc(&skb->users);
			treq->pktopts = skb;
		}
1114 1115

		if (want_cookie) {
1116 1117
			isn = cookie_v6_init_sequence(sk, skb, &req->mss);
			req->cookie_ts = tmp_opt.tstamp_ok;
1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131
			goto have_isn;
		}

		/* VJ's idea. We save last timestamp seen
		 * from the destination in peer table, when entering
		 * state TIME-WAIT, and check against it before
		 * accepting new connection request.
		 *
		 * If "isn" is not zero, this request hit alive
		 * timewait bucket, so that all the necessary checks
		 * are made in the function processing timewait state.
		 */
		if (tmp_opt.saw_tstamp &&
		    tcp_death_row.sysctl_tw_recycle &&
1132 1133
		    (dst = inet6_csk_route_req(sk, &fl6, req)) != NULL) {
			if (!tcp_peer_is_proven(req, dst, true)) {
1134 1135 1136 1137 1138 1139 1140 1141
				NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_PAWSPASSIVEREJECTED);
				goto drop_and_release;
			}
		}
		/* Kill the following clause, if you dislike this way. */
		else if (!sysctl_tcp_syncookies &&
			 (sysctl_max_syn_backlog - inet_csk_reqsk_queue_len(sk) <
			  (sysctl_max_syn_backlog >> 2)) &&
1142
			 !tcp_peer_is_proven(req, dst, false)) {
1143 1144 1145 1146 1147 1148 1149 1150 1151 1152
			/* Without syncookies last quarter of
			 * backlog is filled with destinations,
			 * proven to be alive.
			 * It means that we continue to communicate
			 * to destinations, already remembered
			 * to the moment of synflood.
			 */
			LIMIT_NETDEBUG(KERN_DEBUG "TCP: drop open request from %pI6/%u\n",
				       &treq->rmt_addr, ntohs(tcp_hdr(skb)->source));
			goto drop_and_release;
1153
		}
1154 1155

		isn = tcp_v6_init_sequence(skb);
1156
	}
1157
have_isn:
1158
	tcp_rsk(req)->snt_isn = isn;
1159
	tcp_rsk(req)->snt_synack = tcp_time_stamp;
L
Linus Torvalds 已提交
1160

1161 1162
	if (security_inet_conn_request(sk, skb, req))
		goto drop_and_release;
1163

1164
	if (tcp_v6_send_synack(sk, dst, &fl6, req,
1165 1166
			       (struct request_values *)&tmp_ext,
			       skb_get_queue_mapping(skb)) ||
1167
	    want_cookie)
1168
		goto drop_and_free;
L
Linus Torvalds 已提交
1169

1170 1171
	inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT);
	return 0;
L
Linus Torvalds 已提交
1172

1173 1174
drop_and_release:
	dst_release(dst);
1175 1176
drop_and_free:
	reqsk_free(req);
L
Linus Torvalds 已提交
1177 1178 1179 1180 1181
drop:
	return 0; /* don't send reset */
}

static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
1182
					  struct request_sock *req,
L
Linus Torvalds 已提交
1183 1184
					  struct dst_entry *dst)
{
1185
	struct inet6_request_sock *treq;
L
Linus Torvalds 已提交
1186 1187 1188 1189 1190
	struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
	struct tcp6_sock *newtcp6sk;
	struct inet_sock *newinet;
	struct tcp_sock *newtp;
	struct sock *newsk;
1191 1192 1193
#ifdef CONFIG_TCP_MD5SIG
	struct tcp_md5sig_key *key;
#endif
1194
	struct flowi6 fl6;
L
Linus Torvalds 已提交
1195 1196 1197 1198 1199 1200 1201 1202

	if (skb->protocol == htons(ETH_P_IP)) {
		/*
		 *	v6 mapped
		 */

		newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst);

1203
		if (newsk == NULL)
L
Linus Torvalds 已提交
1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214
			return NULL;

		newtcp6sk = (struct tcp6_sock *)newsk;
		inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;

		newinet = inet_sk(newsk);
		newnp = inet6_sk(newsk);
		newtp = tcp_sk(newsk);

		memcpy(newnp, np, sizeof(struct ipv6_pinfo));

E
Eric Dumazet 已提交
1215
		ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr);
L
Linus Torvalds 已提交
1216

E
Eric Dumazet 已提交
1217
		ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr);
L
Linus Torvalds 已提交
1218

A
Alexey Dobriyan 已提交
1219
		newnp->rcv_saddr = newnp->saddr;
L
Linus Torvalds 已提交
1220

1221
		inet_csk(newsk)->icsk_af_ops = &ipv6_mapped;
L
Linus Torvalds 已提交
1222
		newsk->sk_backlog_rcv = tcp_v4_do_rcv;
1223 1224 1225 1226
#ifdef CONFIG_TCP_MD5SIG
		newtp->af_specific = &tcp_sock_ipv6_mapped_specific;
#endif

1227 1228
		newnp->ipv6_ac_list = NULL;
		newnp->ipv6_fl_list = NULL;
L
Linus Torvalds 已提交
1229 1230
		newnp->pktoptions  = NULL;
		newnp->opt	   = NULL;
1231
		newnp->mcast_oif   = inet6_iif(skb);
1232
		newnp->mcast_hops  = ipv6_hdr(skb)->hop_limit;
1233
		newnp->rcv_tclass  = ipv6_tclass(ipv6_hdr(skb));
L
Linus Torvalds 已提交
1234

1235 1236 1237 1238
		/*
		 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
		 * here, tcp_create_openreq_child now does this for us, see the comment in
		 * that function for the gory details. -acme
L
Linus Torvalds 已提交
1239 1240 1241
		 */

		/* It is tricky place. Until this moment IPv4 tcp
1242
		   worked with IPv6 icsk.icsk_af_ops.
L
Linus Torvalds 已提交
1243 1244
		   Sync it now.
		 */
1245
		tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
L
Linus Torvalds 已提交
1246 1247 1248 1249

		return newsk;
	}

1250
	treq = inet6_rsk(req);
L
Linus Torvalds 已提交
1251 1252 1253 1254

	if (sk_acceptq_is_full(sk))
		goto out_overflow;

1255
	if (!dst) {
1256
		dst = inet6_csk_route_req(sk, &fl6, req);
1257
		if (!dst)
L
Linus Torvalds 已提交
1258
			goto out;
1259
	}
L
Linus Torvalds 已提交
1260 1261 1262

	newsk = tcp_create_openreq_child(sk, req, skb);
	if (newsk == NULL)
1263
		goto out_nonewsk;
L
Linus Torvalds 已提交
1264

1265 1266 1267 1268 1269
	/*
	 * No need to charge this sock to the relevant IPv6 refcnt debug socks
	 * count here, tcp_create_openreq_child now does this for us, see the
	 * comment in that function for the gory details. -acme
	 */
L
Linus Torvalds 已提交
1270

1271
	newsk->sk_gso_type = SKB_GSO_TCPV6;
1272
	__ip6_dst_store(newsk, dst, NULL, NULL);
L
Linus Torvalds 已提交
1273 1274 1275 1276 1277 1278 1279 1280 1281 1282

	newtcp6sk = (struct tcp6_sock *)newsk;
	inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;

	newtp = tcp_sk(newsk);
	newinet = inet_sk(newsk);
	newnp = inet6_sk(newsk);

	memcpy(newnp, np, sizeof(struct ipv6_pinfo));

A
Alexey Dobriyan 已提交
1283 1284 1285
	newnp->daddr = treq->rmt_addr;
	newnp->saddr = treq->loc_addr;
	newnp->rcv_saddr = treq->loc_addr;
1286
	newsk->sk_bound_dev_if = treq->iif;
L
Linus Torvalds 已提交
1287

1288
	/* Now IPv6 options...
L
Linus Torvalds 已提交
1289 1290 1291

	   First: no IPv4 options.
	 */
1292
	newinet->inet_opt = NULL;
1293
	newnp->ipv6_ac_list = NULL;
1294
	newnp->ipv6_fl_list = NULL;
L
Linus Torvalds 已提交
1295 1296 1297 1298 1299 1300

	/* Clone RX bits */
	newnp->rxopt.all = np->rxopt.all;

	/* Clone pktoptions received with SYN */
	newnp->pktoptions = NULL;
1301
	if (treq->pktopts != NULL) {
1302 1303
		newnp->pktoptions = skb_clone(treq->pktopts,
					      sk_gfp_atomic(sk, GFP_ATOMIC));
1304
		consume_skb(treq->pktopts);
1305
		treq->pktopts = NULL;
L
Linus Torvalds 已提交
1306 1307 1308 1309
		if (newnp->pktoptions)
			skb_set_owner_r(newnp->pktoptions, newsk);
	}
	newnp->opt	  = NULL;
1310
	newnp->mcast_oif  = inet6_iif(skb);
1311
	newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
1312
	newnp->rcv_tclass = ipv6_tclass(ipv6_hdr(skb));
L
Linus Torvalds 已提交
1313 1314 1315 1316 1317 1318 1319

	/* Clone native IPv6 options from listening socket (if any)

	   Yes, keeping reference count would be much more clever,
	   but we make one more one thing there: reattach optmem
	   to newsk.
	 */
1320 1321
	if (np->opt)
		newnp->opt = ipv6_dup_options(newsk, np->opt);
L
Linus Torvalds 已提交
1322

1323
	inet_csk(newsk)->icsk_ext_hdr_len = 0;
L
Linus Torvalds 已提交
1324
	if (newnp->opt)
1325 1326
		inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
						     newnp->opt->opt_flen);
L
Linus Torvalds 已提交
1327

J
John Heffner 已提交
1328
	tcp_mtup_init(newsk);
L
Linus Torvalds 已提交
1329
	tcp_sync_mss(newsk, dst_mtu(dst));
1330
	newtp->advmss = dst_metric_advmss(dst);
1331 1332 1333 1334
	if (tcp_sk(sk)->rx_opt.user_mss &&
	    tcp_sk(sk)->rx_opt.user_mss < newtp->advmss)
		newtp->advmss = tcp_sk(sk)->rx_opt.user_mss;

L
Linus Torvalds 已提交
1335
	tcp_initialize_rcv_mss(newsk);
1336 1337 1338 1339
	if (tcp_rsk(req)->snt_synack)
		tcp_valid_rtt_meas(newsk,
		    tcp_time_stamp - tcp_rsk(req)->snt_synack);
	newtp->total_retrans = req->retrans;
L
Linus Torvalds 已提交
1340

E
Eric Dumazet 已提交
1341 1342
	newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
	newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
L
Linus Torvalds 已提交
1343

1344 1345 1346 1347 1348 1349 1350 1351
#ifdef CONFIG_TCP_MD5SIG
	/* Copy over the MD5 key from the original socket */
	if ((key = tcp_v6_md5_do_lookup(sk, &newnp->daddr)) != NULL) {
		/* We're using one, so create a matching key
		 * on the newsk structure. If we fail to get
		 * memory, then we end up not copying the key
		 * across. Shucks.
		 */
E
Eric Dumazet 已提交
1352
		tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newnp->daddr,
1353 1354
			       AF_INET6, key->key, key->keylen,
			       sk_gfp_atomic(sk, GFP_ATOMIC));
1355 1356 1357
	}
#endif

1358 1359 1360 1361
	if (__inet_inherit_port(sk, newsk) < 0) {
		sock_put(newsk);
		goto out;
	}
1362
	__inet6_hash(newsk, NULL);
L
Linus Torvalds 已提交
1363 1364 1365 1366

	return newsk;

out_overflow:
1367
	NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
1368
out_nonewsk:
L
Linus Torvalds 已提交
1369
	dst_release(dst);
1370 1371
out:
	NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
L
Linus Torvalds 已提交
1372 1373 1374
	return NULL;
}

1375
static __sum16 tcp_v6_checksum_init(struct sk_buff *skb)
L
Linus Torvalds 已提交
1376
{
1377
	if (skb->ip_summed == CHECKSUM_COMPLETE) {
H
Herbert Xu 已提交
1378
		if (!tcp_v6_check(skb->len, &ipv6_hdr(skb)->saddr,
1379
				  &ipv6_hdr(skb)->daddr, skb->csum)) {
1380
			skb->ip_summed = CHECKSUM_UNNECESSARY;
L
Linus Torvalds 已提交
1381
			return 0;
1382
		}
L
Linus Torvalds 已提交
1383
	}
1384

H
Herbert Xu 已提交
1385
	skb->csum = ~csum_unfold(tcp_v6_check(skb->len,
1386 1387
					      &ipv6_hdr(skb)->saddr,
					      &ipv6_hdr(skb)->daddr, 0));
1388

L
Linus Torvalds 已提交
1389
	if (skb->len <= 76) {
1390
		return __skb_checksum_complete(skb);
L
Linus Torvalds 已提交
1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419
	}
	return 0;
}

/* The socket must have it's spinlock held when we get
 * here.
 *
 * We have a potential double-lock case here, so even when
 * doing backlog processing we use the BH locking scheme.
 * This is because we cannot sleep with the original spinlock
 * held.
 */
static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
{
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct tcp_sock *tp;
	struct sk_buff *opt_skb = NULL;

	/* Imagine: socket is IPv6. IPv4 packet arrives,
	   goes to IPv4 receive handler and backlogged.
	   From backlog it always goes here. Kerboom...
	   Fortunately, tcp_rcv_established and rcv_established
	   handle them correctly, but it is not case with
	   tcp_v6_hnd_req and tcp_v6_send_reset().   --ANK
	 */

	if (skb->protocol == htons(ETH_P_IP))
		return tcp_v4_do_rcv(sk, skb);

1420 1421 1422 1423 1424
#ifdef CONFIG_TCP_MD5SIG
	if (tcp_v6_inbound_md5_hash (sk, skb))
		goto discard;
#endif

1425
	if (sk_filter(sk, skb))
L
Linus Torvalds 已提交
1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443
		goto discard;

	/*
	 *	socket locking is here for SMP purposes as backlog rcv
	 *	is currently called with bh processing disabled.
	 */

	/* Do Stevens' IPV6_PKTOPTIONS.

	   Yes, guys, it is the only place in our code, where we
	   may make it not affecting IPv4.
	   The rest of code is protocol independent,
	   and I do not like idea to uglify IPv4.

	   Actually, all the idea behind IPV6_PKTOPTIONS
	   looks not very well thought. For now we latch
	   options, received in the last packet, enqueued
	   by tcp. Feel free to propose better solution.
1444
					       --ANK (980728)
L
Linus Torvalds 已提交
1445 1446
	 */
	if (np->rxopt.all)
1447
		opt_skb = skb_clone(skb, sk_gfp_atomic(sk, GFP_ATOMIC));
L
Linus Torvalds 已提交
1448 1449

	if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */
E
Eric Dumazet 已提交
1450 1451
		struct dst_entry *dst = sk->sk_rx_dst;

1452
		sock_rps_save_rxhash(sk, skb);
E
Eric Dumazet 已提交
1453 1454 1455 1456 1457 1458 1459 1460
		if (dst) {
			if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif ||
			    dst->ops->check(dst, np->rx_dst_cookie) == NULL) {
				dst_release(dst);
				sk->sk_rx_dst = NULL;
			}
		}

1461
		if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len))
L
Linus Torvalds 已提交
1462 1463 1464 1465 1466 1467
			goto reset;
		if (opt_skb)
			goto ipv6_pktoptions;
		return 0;
	}

1468
	if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb))
L
Linus Torvalds 已提交
1469 1470
		goto csum_err;

1471
	if (sk->sk_state == TCP_LISTEN) {
L
Linus Torvalds 已提交
1472 1473 1474 1475 1476 1477 1478 1479 1480
		struct sock *nsk = tcp_v6_hnd_req(sk, skb);
		if (!nsk)
			goto discard;

		/*
		 * Queue it on the new socket if the new socket is active,
		 * otherwise we just shortcircuit this and continue with
		 * the new socket..
		 */
1481
		if(nsk != sk) {
1482
			sock_rps_save_rxhash(nsk, skb);
L
Linus Torvalds 已提交
1483 1484 1485 1486 1487 1488
			if (tcp_child_process(sk, nsk, skb))
				goto reset;
			if (opt_skb)
				__kfree_skb(opt_skb);
			return 0;
		}
1489
	} else
1490
		sock_rps_save_rxhash(sk, skb);
L
Linus Torvalds 已提交
1491

1492
	if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len))
L
Linus Torvalds 已提交
1493 1494 1495 1496 1497 1498
		goto reset;
	if (opt_skb)
		goto ipv6_pktoptions;
	return 0;

reset:
1499
	tcp_v6_send_reset(sk, skb);
L
Linus Torvalds 已提交
1500 1501 1502 1503 1504 1505
discard:
	if (opt_skb)
		__kfree_skb(opt_skb);
	kfree_skb(skb);
	return 0;
csum_err:
1506
	TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS);
L
Linus Torvalds 已提交
1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520
	goto discard;


ipv6_pktoptions:
	/* Do you ask, what is it?

	   1. skb was enqueued by tcp.
	   2. skb is added to tail of read queue, rather than out of order.
	   3. socket is not in passive state.
	   4. Finally, it really contains options, which user wants to receive.
	 */
	tp = tcp_sk(sk);
	if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt &&
	    !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) {
1521
		if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo)
1522
			np->mcast_oif = inet6_iif(opt_skb);
1523
		if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim)
1524
			np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit;
1525 1526
		if (np->rxopt.bits.rxtclass)
			np->rcv_tclass = ipv6_tclass(ipv6_hdr(skb));
L
Linus Torvalds 已提交
1527 1528 1529 1530 1531 1532 1533 1534 1535
		if (ipv6_opt_accepted(sk, opt_skb)) {
			skb_set_owner_r(opt_skb, sk);
			opt_skb = xchg(&np->pktoptions, opt_skb);
		} else {
			__kfree_skb(opt_skb);
			opt_skb = xchg(&np->pktoptions, NULL);
		}
	}

1536
	kfree_skb(opt_skb);
L
Linus Torvalds 已提交
1537 1538 1539
	return 0;
}

1540
static int tcp_v6_rcv(struct sk_buff *skb)
L
Linus Torvalds 已提交
1541
{
1542
	const struct tcphdr *th;
1543
	const struct ipv6hdr *hdr;
L
Linus Torvalds 已提交
1544 1545
	struct sock *sk;
	int ret;
1546
	struct net *net = dev_net(skb->dev);
L
Linus Torvalds 已提交
1547 1548 1549 1550 1551 1552 1553

	if (skb->pkt_type != PACKET_HOST)
		goto discard_it;

	/*
	 *	Count it even if it's bad.
	 */
1554
	TCP_INC_STATS_BH(net, TCP_MIB_INSEGS);
L
Linus Torvalds 已提交
1555 1556 1557 1558

	if (!pskb_may_pull(skb, sizeof(struct tcphdr)))
		goto discard_it;

1559
	th = tcp_hdr(skb);
L
Linus Torvalds 已提交
1560 1561 1562 1563 1564 1565

	if (th->doff < sizeof(struct tcphdr)/4)
		goto bad_packet;
	if (!pskb_may_pull(skb, th->doff*4))
		goto discard_it;

1566
	if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb))
L
Linus Torvalds 已提交
1567 1568
		goto bad_packet;

1569
	th = tcp_hdr(skb);
1570
	hdr = ipv6_hdr(skb);
L
Linus Torvalds 已提交
1571 1572 1573 1574 1575
	TCP_SKB_CB(skb)->seq = ntohl(th->seq);
	TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin +
				    skb->len - th->doff*4);
	TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq);
	TCP_SKB_CB(skb)->when = 0;
1576
	TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr);
L
Linus Torvalds 已提交
1577 1578
	TCP_SKB_CB(skb)->sacked = 0;

1579
	sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest);
L
Linus Torvalds 已提交
1580 1581 1582 1583 1584 1585 1586
	if (!sk)
		goto no_tcp_socket;

process:
	if (sk->sk_state == TCP_TIME_WAIT)
		goto do_time_wait;

1587 1588 1589 1590 1591
	if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) {
		NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP);
		goto discard_and_relse;
	}

L
Linus Torvalds 已提交
1592 1593 1594
	if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
		goto discard_and_relse;

1595
	if (sk_filter(sk, skb))
L
Linus Torvalds 已提交
1596 1597 1598 1599
		goto discard_and_relse;

	skb->dev = NULL;

1600
	bh_lock_sock_nested(sk);
L
Linus Torvalds 已提交
1601 1602
	ret = 0;
	if (!sock_owned_by_user(sk)) {
C
Chris Leech 已提交
1603
#ifdef CONFIG_NET_DMA
1604
		struct tcp_sock *tp = tcp_sk(sk);
1605
		if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list)
1606
			tp->ucopy.dma_chan = net_dma_find_channel();
1607 1608 1609
		if (tp->ucopy.dma_chan)
			ret = tcp_v6_do_rcv(sk, skb);
		else
C
Chris Leech 已提交
1610 1611 1612 1613 1614
#endif
		{
			if (!tcp_prequeue(sk, skb))
				ret = tcp_v6_do_rcv(sk, skb);
		}
1615 1616
	} else if (unlikely(sk_add_backlog(sk, skb,
					   sk->sk_rcvbuf + sk->sk_sndbuf))) {
Z
Zhu Yi 已提交
1617
		bh_unlock_sock(sk);
1618
		NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP);
Z
Zhu Yi 已提交
1619 1620
		goto discard_and_relse;
	}
L
Linus Torvalds 已提交
1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631
	bh_unlock_sock(sk);

	sock_put(sk);
	return ret ? -1 : 0;

no_tcp_socket:
	if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
		goto discard_it;

	if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
bad_packet:
1632
		TCP_INC_STATS_BH(net, TCP_MIB_INERRS);
L
Linus Torvalds 已提交
1633
	} else {
1634
		tcp_v6_send_reset(NULL, skb);
L
Linus Torvalds 已提交
1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651
	}

discard_it:

	/*
	 *	Discard frame
	 */

	kfree_skb(skb);
	return 0;

discard_and_relse:
	sock_put(sk);
	goto discard_it;

do_time_wait:
	if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
1652
		inet_twsk_put(inet_twsk(sk));
L
Linus Torvalds 已提交
1653 1654 1655 1656
		goto discard_it;
	}

	if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
1657
		TCP_INC_STATS_BH(net, TCP_MIB_INERRS);
1658
		inet_twsk_put(inet_twsk(sk));
L
Linus Torvalds 已提交
1659 1660 1661
		goto discard_it;
	}

1662
	switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) {
L
Linus Torvalds 已提交
1663 1664 1665 1666
	case TCP_TW_SYN:
	{
		struct sock *sk2;

1667
		sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo,
1668
					    &ipv6_hdr(skb)->daddr,
1669
					    ntohs(th->dest), inet6_iif(skb));
L
Linus Torvalds 已提交
1670
		if (sk2 != NULL) {
1671 1672 1673
			struct inet_timewait_sock *tw = inet_twsk(sk);
			inet_twsk_deschedule(tw, &tcp_death_row);
			inet_twsk_put(tw);
L
Linus Torvalds 已提交
1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688
			sk = sk2;
			goto process;
		}
		/* Fall through to ACK */
	}
	case TCP_TW_ACK:
		tcp_v6_timewait_ack(sk, skb);
		break;
	case TCP_TW_RST:
		goto no_tcp_socket;
	case TCP_TW_SUCCESS:;
	}
	goto discard_it;
}

E
Eric Dumazet 已提交
1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717
static void tcp_v6_early_demux(struct sk_buff *skb)
{
	const struct ipv6hdr *hdr;
	const struct tcphdr *th;
	struct sock *sk;

	if (skb->pkt_type != PACKET_HOST)
		return;

	if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr)))
		return;

	hdr = ipv6_hdr(skb);
	th = tcp_hdr(skb);

	if (th->doff < sizeof(struct tcphdr) / 4)
		return;

	sk = __inet6_lookup_established(dev_net(skb->dev), &tcp_hashinfo,
					&hdr->saddr, th->source,
					&hdr->daddr, ntohs(th->dest),
					inet6_iif(skb));
	if (sk) {
		skb->sk = sk;
		skb->destructor = sock_edemux;
		if (sk->sk_state != TCP_TIME_WAIT) {
			struct dst_entry *dst = sk->sk_rx_dst;
			struct inet_sock *icsk = inet_sk(sk);
			if (dst)
E
Eric Dumazet 已提交
1718
				dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie);
E
Eric Dumazet 已提交
1719
			if (dst &&
E
Eric Dumazet 已提交
1720
			    icsk->rx_dst_ifindex == skb->skb_iif)
E
Eric Dumazet 已提交
1721 1722 1723 1724 1725
				skb_dst_set_noref(skb, dst);
		}
	}
}

1726 1727 1728 1729 1730 1731
static struct timewait_sock_ops tcp6_timewait_sock_ops = {
	.twsk_obj_size	= sizeof(struct tcp6_timewait_sock),
	.twsk_unique	= tcp_twsk_unique,
	.twsk_destructor= tcp_twsk_destructor,
};

E
Eric Dumazet 已提交
1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743
static void inet6_sk_rx_dst_set(struct sock *sk, const struct sk_buff *skb)
{
	struct dst_entry *dst = skb_dst(skb);
	const struct rt6_info *rt = (const struct rt6_info *)dst;

	dst_hold(dst);
	sk->sk_rx_dst = dst;
	inet_sk(sk)->rx_dst_ifindex = skb->skb_iif;
	if (rt->rt6i_node)
		inet6_sk(sk)->rx_dst_cookie = rt->rt6i_node->fn_sernum;
}

1744
static const struct inet_connection_sock_af_ops ipv6_specific = {
1745 1746 1747
	.queue_xmit	   = inet6_csk_xmit,
	.send_check	   = tcp_v6_send_check,
	.rebuild_header	   = inet6_sk_rebuild_header,
E
Eric Dumazet 已提交
1748
	.sk_rx_dst_set	   = inet6_sk_rx_dst_set,
1749 1750 1751
	.conn_request	   = tcp_v6_conn_request,
	.syn_recv_sock	   = tcp_v6_syn_recv_sock,
	.net_header_len	   = sizeof(struct ipv6hdr),
1752
	.net_frag_header_len = sizeof(struct frag_hdr),
1753 1754 1755 1756
	.setsockopt	   = ipv6_setsockopt,
	.getsockopt	   = ipv6_getsockopt,
	.addr2sockaddr	   = inet6_csk_addr2sockaddr,
	.sockaddr_len	   = sizeof(struct sockaddr_in6),
1757
	.bind_conflict	   = inet6_csk_bind_conflict,
1758
#ifdef CONFIG_COMPAT
1759 1760
	.compat_setsockopt = compat_ipv6_setsockopt,
	.compat_getsockopt = compat_ipv6_getsockopt,
1761
#endif
L
Linus Torvalds 已提交
1762 1763
};

1764
#ifdef CONFIG_TCP_MD5SIG
1765
static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = {
1766
	.md5_lookup	=	tcp_v6_md5_lookup,
1767
	.calc_md5_hash	=	tcp_v6_md5_hash_skb,
1768 1769
	.md5_parse	=	tcp_v6_parse_md5_keys,
};
1770
#endif
1771

L
Linus Torvalds 已提交
1772 1773 1774 1775
/*
 *	TCP over IPv4 via INET6 API
 */

1776
static const struct inet_connection_sock_af_ops ipv6_mapped = {
1777 1778 1779
	.queue_xmit	   = ip_queue_xmit,
	.send_check	   = tcp_v4_send_check,
	.rebuild_header	   = inet_sk_rebuild_header,
1780
	.sk_rx_dst_set	   = inet_sk_rx_dst_set,
1781 1782 1783 1784 1785 1786 1787
	.conn_request	   = tcp_v6_conn_request,
	.syn_recv_sock	   = tcp_v6_syn_recv_sock,
	.net_header_len	   = sizeof(struct iphdr),
	.setsockopt	   = ipv6_setsockopt,
	.getsockopt	   = ipv6_getsockopt,
	.addr2sockaddr	   = inet6_csk_addr2sockaddr,
	.sockaddr_len	   = sizeof(struct sockaddr_in6),
1788
	.bind_conflict	   = inet6_csk_bind_conflict,
1789
#ifdef CONFIG_COMPAT
1790 1791
	.compat_setsockopt = compat_ipv6_setsockopt,
	.compat_getsockopt = compat_ipv6_getsockopt,
1792
#endif
L
Linus Torvalds 已提交
1793 1794
};

1795
#ifdef CONFIG_TCP_MD5SIG
1796
static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = {
1797
	.md5_lookup	=	tcp_v4_md5_lookup,
1798
	.calc_md5_hash	=	tcp_v4_md5_hash_skb,
1799 1800
	.md5_parse	=	tcp_v6_parse_md5_keys,
};
1801
#endif
1802

L
Linus Torvalds 已提交
1803 1804 1805 1806 1807
/* NOTE: A lot of things set to zero explicitly by call to
 *       sk_alloc() so need not be done here.
 */
static int tcp_v6_init_sock(struct sock *sk)
{
1808
	struct inet_connection_sock *icsk = inet_csk(sk);
L
Linus Torvalds 已提交
1809

1810
	tcp_init_sock(sk);
L
Linus Torvalds 已提交
1811

1812
	icsk->icsk_af_ops = &ipv6_specific;
L
Linus Torvalds 已提交
1813

1814
#ifdef CONFIG_TCP_MD5SIG
1815
	tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific;
1816 1817
#endif

L
Linus Torvalds 已提交
1818 1819 1820
	return 0;
}

1821
static void tcp_v6_destroy_sock(struct sock *sk)
L
Linus Torvalds 已提交
1822 1823
{
	tcp_v4_destroy_sock(sk);
1824
	inet6_destroy_sock(sk);
L
Linus Torvalds 已提交
1825 1826
}

1827
#ifdef CONFIG_PROC_FS
L
Linus Torvalds 已提交
1828
/* Proc filesystem TCPv6 sock list dumping. */
1829
static void get_openreq6(struct seq_file *seq,
1830
			 const struct sock *sk, struct request_sock *req, int i, int uid)
L
Linus Torvalds 已提交
1831 1832
{
	int ttd = req->expires - jiffies;
1833 1834
	const struct in6_addr *src = &inet6_rsk(req)->loc_addr;
	const struct in6_addr *dest = &inet6_rsk(req)->rmt_addr;
L
Linus Torvalds 已提交
1835 1836 1837 1838 1839 1840

	if (ttd < 0)
		ttd = 0;

	seq_printf(seq,
		   "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
D
Dan Rosenberg 已提交
1841
		   "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n",
L
Linus Torvalds 已提交
1842 1843 1844
		   i,
		   src->s6_addr32[0], src->s6_addr32[1],
		   src->s6_addr32[2], src->s6_addr32[3],
1845
		   ntohs(inet_rsk(req)->loc_port),
L
Linus Torvalds 已提交
1846 1847
		   dest->s6_addr32[0], dest->s6_addr32[1],
		   dest->s6_addr32[2], dest->s6_addr32[3],
1848
		   ntohs(inet_rsk(req)->rmt_port),
L
Linus Torvalds 已提交
1849 1850
		   TCP_SYN_RECV,
		   0,0, /* could print option size, but that is af dependent. */
1851 1852
		   1,   /* timers active (only the expire timer) */
		   jiffies_to_clock_t(ttd),
L
Linus Torvalds 已提交
1853 1854
		   req->retrans,
		   uid,
1855
		   0,  /* non standard timer */
L
Linus Torvalds 已提交
1856 1857 1858 1859 1860 1861
		   0, /* open_requests have no inode */
		   0, req);
}

static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i)
{
1862
	const struct in6_addr *dest, *src;
L
Linus Torvalds 已提交
1863 1864 1865
	__u16 destp, srcp;
	int timer_active;
	unsigned long timer_expires;
1866 1867
	const struct inet_sock *inet = inet_sk(sp);
	const struct tcp_sock *tp = tcp_sk(sp);
1868
	const struct inet_connection_sock *icsk = inet_csk(sp);
1869
	const struct ipv6_pinfo *np = inet6_sk(sp);
L
Linus Torvalds 已提交
1870 1871 1872

	dest  = &np->daddr;
	src   = &np->rcv_saddr;
E
Eric Dumazet 已提交
1873 1874
	destp = ntohs(inet->inet_dport);
	srcp  = ntohs(inet->inet_sport);
1875 1876

	if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
L
Linus Torvalds 已提交
1877
		timer_active	= 1;
1878 1879
		timer_expires	= icsk->icsk_timeout;
	} else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
L
Linus Torvalds 已提交
1880
		timer_active	= 4;
1881
		timer_expires	= icsk->icsk_timeout;
L
Linus Torvalds 已提交
1882 1883 1884 1885 1886 1887 1888 1889 1890 1891
	} else if (timer_pending(&sp->sk_timer)) {
		timer_active	= 2;
		timer_expires	= sp->sk_timer.expires;
	} else {
		timer_active	= 0;
		timer_expires = jiffies;
	}

	seq_printf(seq,
		   "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
D
Dan Rosenberg 已提交
1892
		   "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %lu %lu %u %u %d\n",
L
Linus Torvalds 已提交
1893 1894 1895 1896 1897
		   i,
		   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,
1898
		   sp->sk_state,
1899 1900
		   tp->write_seq-tp->snd_una,
		   (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq),
L
Linus Torvalds 已提交
1901 1902
		   timer_active,
		   jiffies_to_clock_t(timer_expires - jiffies),
1903
		   icsk->icsk_retransmits,
L
Linus Torvalds 已提交
1904
		   sock_i_uid(sp),
1905
		   icsk->icsk_probes_out,
L
Linus Torvalds 已提交
1906 1907
		   sock_i_ino(sp),
		   atomic_read(&sp->sk_refcnt), sp,
1908 1909
		   jiffies_to_clock_t(icsk->icsk_rto),
		   jiffies_to_clock_t(icsk->icsk_ack.ato),
1910
		   (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong,
I
Ilpo Järvinen 已提交
1911 1912
		   tp->snd_cwnd,
		   tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh
L
Linus Torvalds 已提交
1913 1914 1915
		   );
}

1916
static void get_timewait6_sock(struct seq_file *seq,
1917
			       struct inet_timewait_sock *tw, int i)
L
Linus Torvalds 已提交
1918
{
1919
	const struct in6_addr *dest, *src;
L
Linus Torvalds 已提交
1920
	__u16 destp, srcp;
1921
	const struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw);
L
Linus Torvalds 已提交
1922 1923 1924 1925 1926
	int ttd = tw->tw_ttd - jiffies;

	if (ttd < 0)
		ttd = 0;

1927 1928
	dest = &tw6->tw_v6_daddr;
	src  = &tw6->tw_v6_rcv_saddr;
L
Linus Torvalds 已提交
1929 1930 1931 1932 1933
	destp = ntohs(tw->tw_dport);
	srcp  = ntohs(tw->tw_sport);

	seq_printf(seq,
		   "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
D
Dan Rosenberg 已提交
1934
		   "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n",
L
Linus Torvalds 已提交
1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975
		   i,
		   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,
		   tw->tw_substate, 0, 0,
		   3, jiffies_to_clock_t(ttd), 0, 0, 0, 0,
		   atomic_read(&tw->tw_refcnt), tw);
}

static int tcp6_seq_show(struct seq_file *seq, void *v)
{
	struct tcp_iter_state *st;

	if (v == SEQ_START_TOKEN) {
		seq_puts(seq,
			 "  sl  "
			 "local_address                         "
			 "remote_address                        "
			 "st tx_queue rx_queue tr tm->when retrnsmt"
			 "   uid  timeout inode\n");
		goto out;
	}
	st = seq->private;

	switch (st->state) {
	case TCP_SEQ_STATE_LISTENING:
	case TCP_SEQ_STATE_ESTABLISHED:
		get_tcp6_sock(seq, v, st->num);
		break;
	case TCP_SEQ_STATE_OPENREQ:
		get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid);
		break;
	case TCP_SEQ_STATE_TIME_WAIT:
		get_timewait6_sock(seq, v, st->num);
		break;
	}
out:
	return 0;
}

1976 1977 1978 1979 1980 1981 1982 1983
static const struct file_operations tcp6_afinfo_seq_fops = {
	.owner   = THIS_MODULE,
	.open    = tcp_seq_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
	.release = seq_release_net
};

L
Linus Torvalds 已提交
1984 1985 1986
static struct tcp_seq_afinfo tcp6_seq_afinfo = {
	.name		= "tcp6",
	.family		= AF_INET6,
1987
	.seq_fops	= &tcp6_afinfo_seq_fops,
1988 1989 1990
	.seq_ops	= {
		.show		= tcp6_seq_show,
	},
L
Linus Torvalds 已提交
1991 1992
};

1993
int __net_init tcp6_proc_init(struct net *net)
L
Linus Torvalds 已提交
1994
{
1995
	return tcp_proc_register(net, &tcp6_seq_afinfo);
L
Linus Torvalds 已提交
1996 1997
}

1998
void tcp6_proc_exit(struct net *net)
L
Linus Torvalds 已提交
1999
{
2000
	tcp_proc_unregister(net, &tcp6_seq_afinfo);
L
Linus Torvalds 已提交
2001 2002 2003 2004 2005 2006 2007 2008 2009
}
#endif

struct proto tcpv6_prot = {
	.name			= "TCPv6",
	.owner			= THIS_MODULE,
	.close			= tcp_close,
	.connect		= tcp_v6_connect,
	.disconnect		= tcp_disconnect,
2010
	.accept			= inet_csk_accept,
L
Linus Torvalds 已提交
2011 2012 2013 2014 2015 2016 2017
	.ioctl			= tcp_ioctl,
	.init			= tcp_v6_init_sock,
	.destroy		= tcp_v6_destroy_sock,
	.shutdown		= tcp_shutdown,
	.setsockopt		= tcp_setsockopt,
	.getsockopt		= tcp_getsockopt,
	.recvmsg		= tcp_recvmsg,
2018 2019
	.sendmsg		= tcp_sendmsg,
	.sendpage		= tcp_sendpage,
L
Linus Torvalds 已提交
2020
	.backlog_rcv		= tcp_v6_do_rcv,
E
Eric Dumazet 已提交
2021
	.release_cb		= tcp_release_cb,
2022
	.mtu_reduced		= tcp_v6_mtu_reduced,
L
Linus Torvalds 已提交
2023
	.hash			= tcp_v6_hash,
2024 2025
	.unhash			= inet_unhash,
	.get_port		= inet_csk_get_port,
L
Linus Torvalds 已提交
2026 2027 2028 2029
	.enter_memory_pressure	= tcp_enter_memory_pressure,
	.sockets_allocated	= &tcp_sockets_allocated,
	.memory_allocated	= &tcp_memory_allocated,
	.memory_pressure	= &tcp_memory_pressure,
2030
	.orphan_count		= &tcp_orphan_count,
L
Linus Torvalds 已提交
2031 2032 2033 2034
	.sysctl_wmem		= sysctl_tcp_wmem,
	.sysctl_rmem		= sysctl_tcp_rmem,
	.max_header		= MAX_TCP_HEADER,
	.obj_size		= sizeof(struct tcp6_sock),
2035
	.slab_flags		= SLAB_DESTROY_BY_RCU,
2036
	.twsk_prot		= &tcp6_timewait_sock_ops,
2037
	.rsk_prot		= &tcp6_request_sock_ops,
2038
	.h.hashinfo		= &tcp_hashinfo,
2039
	.no_autobind		= true,
2040 2041 2042 2043
#ifdef CONFIG_COMPAT
	.compat_setsockopt	= compat_tcp_setsockopt,
	.compat_getsockopt	= compat_tcp_getsockopt,
#endif
A
Andrew Morton 已提交
2044
#ifdef CONFIG_MEMCG_KMEM
G
Glauber Costa 已提交
2045 2046
	.proto_cgroup		= tcp_proto_cgroup,
#endif
L
Linus Torvalds 已提交
2047 2048
};

2049
static const struct inet6_protocol tcpv6_protocol = {
E
Eric Dumazet 已提交
2050
	.early_demux	=	tcp_v6_early_demux,
L
Linus Torvalds 已提交
2051 2052
	.handler	=	tcp_v6_rcv,
	.err_handler	=	tcp_v6_err,
2053
	.gso_send_check	=	tcp_v6_gso_send_check,
H
Herbert Xu 已提交
2054
	.gso_segment	=	tcp_tso_segment,
H
Herbert Xu 已提交
2055 2056
	.gro_receive	=	tcp6_gro_receive,
	.gro_complete	=	tcp6_gro_complete,
L
Linus Torvalds 已提交
2057 2058 2059 2060 2061 2062 2063 2064 2065
	.flags		=	INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
};

static struct inet_protosw tcpv6_protosw = {
	.type		=	SOCK_STREAM,
	.protocol	=	IPPROTO_TCP,
	.prot		=	&tcpv6_prot,
	.ops		=	&inet6_stream_ops,
	.no_check	=	0,
2066 2067
	.flags		=	INET_PROTOSW_PERMANENT |
				INET_PROTOSW_ICSK,
L
Linus Torvalds 已提交
2068 2069
};

2070
static int __net_init tcpv6_net_init(struct net *net)
2071
{
2072 2073
	return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6,
				    SOCK_RAW, IPPROTO_TCP, net);
2074 2075
}

2076
static void __net_exit tcpv6_net_exit(struct net *net)
2077
{
2078
	inet_ctl_sock_destroy(net->ipv6.tcp_sk);
E
Eric W. Biederman 已提交
2079 2080
}

2081
static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list)
E
Eric W. Biederman 已提交
2082 2083
{
	inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6);
2084 2085 2086
}

static struct pernet_operations tcpv6_net_ops = {
E
Eric W. Biederman 已提交
2087 2088 2089
	.init	    = tcpv6_net_init,
	.exit	    = tcpv6_net_exit,
	.exit_batch = tcpv6_net_exit_batch,
2090 2091
};

2092
int __init tcpv6_init(void)
L
Linus Torvalds 已提交
2093
{
2094 2095 2096 2097 2098 2099
	int ret;

	ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP);
	if (ret)
		goto out;

L
Linus Torvalds 已提交
2100
	/* register inet6 protocol */
2101 2102 2103 2104
	ret = inet6_register_protosw(&tcpv6_protosw);
	if (ret)
		goto out_tcpv6_protocol;

2105
	ret = register_pernet_subsys(&tcpv6_net_ops);
2106 2107 2108 2109
	if (ret)
		goto out_tcpv6_protosw;
out:
	return ret;
2110

2111 2112 2113 2114 2115 2116 2117
out_tcpv6_protocol:
	inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
out_tcpv6_protosw:
	inet6_unregister_protosw(&tcpv6_protosw);
	goto out;
}

2118
void tcpv6_exit(void)
2119
{
2120
	unregister_pernet_subsys(&tcpv6_net_ops);
2121 2122
	inet6_unregister_protosw(&tcpv6_protosw);
	inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
L
Linus Torvalds 已提交
2123
}