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Commit 92e55f41 authored by Pablo Neira's avatar Pablo Neira Committed by David S. Miller
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tcp: don't annotate mark on control socket from tcp_v6_send_response() 



Unlike ipv4, this control socket is shared by all cpus so we cannot use
it as scratchpad area to annotate the mark that we pass to ip6_xmit().

Add a new parameter to ip6_xmit() to indicate the mark. The SCTP socket
family caches the flowi6 structure in the sctp_transport structure, so
we cannot use to carry the mark unless we later on reset it back, which
I discarded since it looks ugly to me.

Fixes: bf99b4de ("tcp: fix mark propagation with fwmark_reflect enabled")
Suggested-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent a47b70ea

include/net/ipv6.h

+1 −1
Original line number Diff line number Diff line
@@ -871,7 +871,7 @@ int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 
 *	upper-layer output functions

 */

int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,

	     struct ipv6_txoptions *opt, int tclass);

	     __u32 mark, struct ipv6_txoptions *opt, int tclass);



int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);

net/dccp/ipv6.c

+2 −2
Original line number Diff line number Diff line
@@ -227,7 +227,7 @@ static int dccp_v6_send_response(const struct sock *sk, struct request_sock *req 
		opt = ireq->ipv6_opt;

		if (!opt)

			opt = rcu_dereference(np->opt);

		err = ip6_xmit(sk, skb, &fl6, opt, np->tclass);

		err = ip6_xmit(sk, skb, &fl6, sk->sk_mark, opt, np->tclass);

		rcu_read_unlock();

		err = net_xmit_eval(err);

	}
@@ -281,7 +281,7 @@ static void dccp_v6_ctl_send_reset(const struct sock *sk, struct sk_buff *rxskb) 
	dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL);

	if (!IS_ERR(dst)) {

		skb_dst_set(skb, dst);

		ip6_xmit(ctl_sk, skb, &fl6, NULL, 0);

		ip6_xmit(ctl_sk, skb, &fl6, 0, NULL, 0);

		DCCP_INC_STATS(DCCP_MIB_OUTSEGS);

		DCCP_INC_STATS(DCCP_MIB_OUTRSTS);

		return;

net/ipv6/inet6_connection_sock.c

+1 −1
Original line number Diff line number Diff line
@@ -176,7 +176,7 @@ int inet6_csk_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl_unused 
	/* Restore final destination back after routing done */

	fl6.daddr = sk->sk_v6_daddr;



	res = ip6_xmit(sk, skb, &fl6, rcu_dereference(np->opt),

	res = ip6_xmit(sk, skb, &fl6, sk->sk_mark, rcu_dereference(np->opt),

		       np->tclass);

	rcu_read_unlock();

	return res;

net/ipv6/ip6_output.c

+2 −2
Original line number Diff line number Diff line
@@ -172,7 +172,7 @@ int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb) 
 * which are using proper atomic operations or spinlocks.

 */

int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,

	     struct ipv6_txoptions *opt, int tclass)

	     __u32 mark, struct ipv6_txoptions *opt, int tclass)

{

	struct net *net = sock_net(sk);

	const struct ipv6_pinfo *np = inet6_sk(sk);
@@ -240,7 +240,7 @@ int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6, 


	skb->protocol = htons(ETH_P_IPV6);

	skb->priority = sk->sk_priority;

	skb->mark = sk->sk_mark;

	skb->mark = mark;



	mtu = dst_mtu(dst);

	if ((skb->len <= mtu) || skb->ignore_df || skb_is_gso(skb)) {

net/ipv6/tcp_ipv6.c

+2 −3
Original line number Diff line number Diff line
@@ -469,7 +469,7 @@ static int tcp_v6_send_synack(const struct sock *sk, struct dst_entry *dst, 
		opt = ireq->ipv6_opt;

		if (!opt)

			opt = rcu_dereference(np->opt);

		err = ip6_xmit(sk, skb, fl6, opt, np->tclass);

		err = ip6_xmit(sk, skb, fl6, sk->sk_mark, opt, np->tclass);

		rcu_read_unlock();

		err = net_xmit_eval(err);

	}
@@ -840,8 +840,7 @@ static void tcp_v6_send_response(const struct sock *sk, struct sk_buff *skb, u32 
	dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL);

	if (!IS_ERR(dst)) {

		skb_dst_set(buff, dst);

		ctl_sk->sk_mark = fl6.flowi6_mark;

		ip6_xmit(ctl_sk, buff, &fl6, NULL, tclass);

		ip6_xmit(ctl_sk, buff, &fl6, fl6.flowi6_mark, NULL, tclass);

		TCP_INC_STATS(net, TCP_MIB_OUTSEGS);

		if (rst)

			TCP_INC_STATS(net, TCP_MIB_OUTRSTS);