Allow disabling of DSACK TCP option per route
Add and use no DSCAK bit in the features field. Signed-off-by: Gilad Ben-Yossef <gilad@codefidence.com> Sigend-off-by: Ori Finkelman <ori@comsleep.com> Sigend-off-by: Yony Amit <yony@comsleep.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -381,6 +381,7 @@ enum
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#define RTAX_FEATURE_NO_TSTAMP 0x00000004
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#define RTAX_FEATURE_ALLFRAG 0x00000008
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#define RTAX_FEATURE_NO_WSCALE 0x00000010
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#define RTAX_FEATURE_NO_DSACK 0x00000020
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struct rta_session
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{
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@ -4080,8 +4080,10 @@ static inline int tcp_sack_extend(struct tcp_sack_block *sp, u32 seq,
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static void tcp_dsack_set(struct sock *sk, u32 seq, u32 end_seq)
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{
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struct tcp_sock *tp = tcp_sk(sk);
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struct dst_entry *dst = __sk_dst_get(sk);
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if (tcp_is_sack(tp) && sysctl_tcp_dsack) {
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if (tcp_is_sack(tp) && sysctl_tcp_dsack &&
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!dst_feature(dst, RTAX_FEATURE_NO_DSACK)) {
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int mib_idx;
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if (before(seq, tp->rcv_nxt))
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@ -4110,13 +4112,15 @@ static void tcp_dsack_extend(struct sock *sk, u32 seq, u32 end_seq)
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static void tcp_send_dupack(struct sock *sk, struct sk_buff *skb)
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{
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struct tcp_sock *tp = tcp_sk(sk);
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struct dst_entry *dst = __sk_dst_get(sk);
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if (TCP_SKB_CB(skb)->end_seq != TCP_SKB_CB(skb)->seq &&
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before(TCP_SKB_CB(skb)->seq, tp->rcv_nxt)) {
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NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_DELAYEDACKLOST);
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tcp_enter_quickack_mode(sk);
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if (tcp_is_sack(tp) && sysctl_tcp_dsack) {
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if (tcp_is_sack(tp) && sysctl_tcp_dsack &&
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!dst_feature(dst, RTAX_FEATURE_NO_DSACK)) {
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u32 end_seq = TCP_SKB_CB(skb)->end_seq;
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if (after(TCP_SKB_CB(skb)->end_seq, tp->rcv_nxt))
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