ip: fix tos reflection in ack and reset packets
[ Upstream commitba9e04a7dd
] Currently, in tcp_v4_reqsk_send_ack() and tcp_v4_send_reset(), we echo the TOS value of the received packets in the response. However, we do not want to echo the lower 2 ECN bits in accordance with RFC 3168 6.1.5 robustness principles. Fixes:1da177e4c3
("Linux-2.6.12-rc2") Signed-off-by: Wei Wang <weiwan@google.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -74,6 +74,7 @@
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#include <net/icmp.h>
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#include <net/checksum.h>
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#include <net/inetpeer.h>
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#include <net/inet_ecn.h>
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#include <net/lwtunnel.h>
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#include <linux/bpf-cgroup.h>
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#include <linux/igmp.h>
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@ -1699,7 +1700,7 @@ void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb,
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if (IS_ERR(rt))
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return;
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inet_sk(sk)->tos = arg->tos;
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inet_sk(sk)->tos = arg->tos & ~INET_ECN_MASK;
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sk->sk_protocol = ip_hdr(skb)->protocol;
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sk->sk_bound_dev_if = arg->bound_dev_if;
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