diff options
| -rw-r--r-- | include/net/tcp.h | 2 | ||||
| -rw-r--r-- | net/ipv4/syncookies.c | 6 | ||||
| -rw-r--r-- | net/ipv4/tcp_input.c | 25 | ||||
| -rw-r--r-- | net/ipv4/tcp_output.c | 13 | ||||
| -rw-r--r-- | net/ipv6/syncookies.c | 2 |
5 files changed, 31 insertions, 17 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h index 36c5084..f50f29faf 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -493,7 +493,7 @@ __u32 cookie_v4_init_sequence(struct sock *sk, const struct sk_buff *skb, __u32 cookie_init_timestamp(struct request_sock *req); bool cookie_timestamp_decode(struct tcp_options_received *opt); bool cookie_ecn_ok(const struct tcp_options_received *opt, - const struct net *net); + const struct net *net, const struct dst_entry *dst); /* From net/ipv6/syncookies.c */ int __cookie_v6_check(const struct ipv6hdr *iph, const struct tcphdr *th, diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c index 6de7725..45fe60c 100644 --- a/net/ipv4/syncookies.c +++ b/net/ipv4/syncookies.c @@ -273,7 +273,7 @@ bool cookie_timestamp_decode(struct tcp_options_received *tcp_opt) EXPORT_SYMBOL(cookie_timestamp_decode); bool cookie_ecn_ok(const struct tcp_options_received *tcp_opt, - const struct net *net) + const struct net *net, const struct dst_entry *dst) { bool ecn_ok = tcp_opt->rcv_tsecr & TS_OPT_ECN; @@ -283,7 +283,7 @@ bool cookie_ecn_ok(const struct tcp_options_received *tcp_opt, if (net->ipv4.sysctl_tcp_ecn) return true; - return false; + return dst_feature(dst, RTAX_FEATURE_ECN); } EXPORT_SYMBOL(cookie_ecn_ok); @@ -387,7 +387,7 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb) dst_metric(&rt->dst, RTAX_INITRWND)); ireq->rcv_wscale = rcv_wscale; - ireq->ecn_ok = cookie_ecn_ok(&tcp_opt, sock_net(sk)); + ireq->ecn_ok = cookie_ecn_ok(&tcp_opt, sock_net(sk), &rt->dst); ret = get_cookie_sock(sk, skb, req, &rt->dst); /* ip_queue_xmit() depends on our flow being setup diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 4e4617e..196b438 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -5876,20 +5876,22 @@ static inline void pr_drop_req(struct request_sock *req, __u16 port, int family) */ static void tcp_ecn_create_request(struct request_sock *req, const struct sk_buff *skb, - const struct sock *listen_sk) + const struct sock *listen_sk, + const struct dst_entry *dst) { const struct tcphdr *th = tcp_hdr(skb); const struct net *net = sock_net(listen_sk); bool th_ecn = th->ece && th->cwr; - bool ect, need_ecn; + bool ect, need_ecn, ecn_ok; if (!th_ecn) return; ect = !INET_ECN_is_not_ect(TCP_SKB_CB(skb)->ip_dsfield); need_ecn = tcp_ca_needs_ecn(listen_sk); + ecn_ok = net->ipv4.sysctl_tcp_ecn || dst_feature(dst, RTAX_FEATURE_ECN); - if (!ect && !need_ecn && net->ipv4.sysctl_tcp_ecn) + if (!ect && !need_ecn && ecn_ok) inet_rsk(req)->ecn_ok = 1; else if (ect && need_ecn) inet_rsk(req)->ecn_ok = 1; @@ -5954,13 +5956,7 @@ int tcp_conn_request(struct request_sock_ops *rsk_ops, if (security_inet_conn_request(sk, skb, req)) goto drop_and_free; - if (!want_cookie || tmp_opt.tstamp_ok) - tcp_ecn_create_request(req, skb, sk); - - if (want_cookie) { - isn = cookie_init_sequence(af_ops, sk, skb, &req->mss); - req->cookie_ts = tmp_opt.tstamp_ok; - } else if (!isn) { + if (!want_cookie && !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 @@ -6008,6 +6004,15 @@ int tcp_conn_request(struct request_sock_ops *rsk_ops, goto drop_and_free; } + tcp_ecn_create_request(req, skb, sk, dst); + + if (want_cookie) { + isn = cookie_init_sequence(af_ops, sk, skb, &req->mss); + req->cookie_ts = tmp_opt.tstamp_ok; + if (!tmp_opt.tstamp_ok) + inet_rsk(req)->ecn_ok = 0; + } + tcp_rsk(req)->snt_isn = isn; tcp_openreq_init_rwin(req, sk, dst); fastopen = !want_cookie && diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index a3d453b..0b88158 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -333,10 +333,19 @@ static void tcp_ecn_send_synack(struct sock *sk, struct sk_buff *skb) static void tcp_ecn_send_syn(struct sock *sk, struct sk_buff *skb) { struct tcp_sock *tp = tcp_sk(sk); + bool use_ecn = sock_net(sk)->ipv4.sysctl_tcp_ecn == 1 || + tcp_ca_needs_ecn(sk); + + if (!use_ecn) { + const struct dst_entry *dst = __sk_dst_get(sk); + + if (dst && dst_feature(dst, RTAX_FEATURE_ECN)) + use_ecn = true; + } tp->ecn_flags = 0; - if (sock_net(sk)->ipv4.sysctl_tcp_ecn == 1 || - tcp_ca_needs_ecn(sk)) { + + if (use_ecn) { TCP_SKB_CB(skb)->tcp_flags |= TCPHDR_ECE | TCPHDR_CWR; tp->ecn_flags = TCP_ECN_OK; if (tcp_ca_needs_ecn(sk)) diff --git a/net/ipv6/syncookies.c b/net/ipv6/syncookies.c index 52cc8cb..7337fc7 100644 --- a/net/ipv6/syncookies.c +++ b/net/ipv6/syncookies.c @@ -262,7 +262,7 @@ struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb) dst_metric(dst, RTAX_INITRWND)); ireq->rcv_wscale = rcv_wscale; - ireq->ecn_ok = cookie_ecn_ok(&tcp_opt, sock_net(sk)); + ireq->ecn_ok = cookie_ecn_ok(&tcp_opt, sock_net(sk), dst); ret = get_cookie_sock(sk, skb, req, dst); out: |