net: Fix possible wrong checksum generation.

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / ipv4 / tcp_input.c

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 18f97ca76b00223b25d0f6faed8a829c45fb95c8..a759e19496d2f57f508db27f21ab73b2b320523a 100644 (file)
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -81,8 +81,6 @@ int sysctl_tcp_sack __read_mostly = 1;
 int sysctl_tcp_fack __read_mostly = 1;
 int sysctl_tcp_reordering __read_mostly = TCP_FASTRETRANS_THRESH;
 EXPORT_SYMBOL(sysctl_tcp_reordering);
-int sysctl_tcp_ecn __read_mostly = 2;
-EXPORT_SYMBOL(sysctl_tcp_ecn);
 int sysctl_tcp_dsack __read_mostly = 1;
 int sysctl_tcp_app_win __read_mostly = 31;
 int sysctl_tcp_adv_win_scale __read_mostly = 1;
@@ -100,7 +98,6 @@ int sysctl_tcp_frto_response __read_mostly;
 int sysctl_tcp_thin_dupack __read_mostly;
 
 int sysctl_tcp_moderate_rcvbuf __read_mostly = 1;
-int sysctl_tcp_abc __read_mostly;
 int sysctl_tcp_early_retrans __read_mostly = 2;
 
 #define FLAG_DATA              0x01 /* Incoming frame contained data.          */
@@ -2009,7 +2006,6 @@ static void tcp_enter_frto_loss(struct sock *sk, int allowed_segments, int flag)
        tp->snd_cwnd_cnt = 0;
        tp->snd_cwnd_stamp = tcp_time_stamp;
        tp->frto_counter = 0;
-       tp->bytes_acked = 0;
 
        tp->reordering = min_t(unsigned int, tp->reordering,
                               sysctl_tcp_reordering);
@@ -2058,7 +2054,6 @@ void tcp_enter_loss(struct sock *sk, int how)
        tp->snd_cwnd_cnt   = 0;
        tp->snd_cwnd_stamp = tcp_time_stamp;
 
-       tp->bytes_acked = 0;
        tcp_clear_retrans_partial(tp);
 
        if (tcp_is_reno(tp))
@@ -2686,7 +2681,6 @@ static void tcp_init_cwnd_reduction(struct sock *sk, const bool set_ssthresh)
        struct tcp_sock *tp = tcp_sk(sk);
 
        tp->high_seq = tp->snd_nxt;
-       tp->bytes_acked = 0;
        tp->snd_cwnd_cnt = 0;
        tp->prior_cwnd = tp->snd_cwnd;
        tp->prr_delivered = 0;
@@ -2737,7 +2731,6 @@ void tcp_enter_cwr(struct sock *sk, const int set_ssthresh)
        struct tcp_sock *tp = tcp_sk(sk);
 
        tp->prior_ssthresh = 0;
-       tp->bytes_acked = 0;
        if (inet_csk(sk)->icsk_ca_state < TCP_CA_CWR) {
                tp->undo_marker = 0;
                tcp_init_cwnd_reduction(sk, set_ssthresh);
@@ -3419,7 +3412,6 @@ static void tcp_conservative_spur_to_response(struct tcp_sock *tp)
 {
        tp->snd_cwnd = min(tp->snd_cwnd, tp->snd_ssthresh);
        tp->snd_cwnd_cnt = 0;
-       tp->bytes_acked = 0;
        TCP_ECN_queue_cwr(tp);
        tcp_moderate_cwnd(tp);
 }
@@ -3504,6 +3496,11 @@ static bool tcp_process_frto(struct sock *sk, int flag)
                }
        } else {
                if (!(flag & FLAG_DATA_ACKED) && (tp->frto_counter == 1)) {
+                       if (!tcp_packets_in_flight(tp)) {
+                               tcp_enter_frto_loss(sk, 2, flag);
+                               return true;
+                       }
+
                        /* Prevent sending of new data. */
                        tp->snd_cwnd = min(tp->snd_cwnd,
                                           tcp_packets_in_flight(tp));
@@ -3610,15 +3607,6 @@ static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag)
        if (after(ack, prior_snd_una))
                flag |= FLAG_SND_UNA_ADVANCED;
 
-       if (sysctl_tcp_abc) {
-               if (icsk->icsk_ca_state < TCP_CA_CWR)
-                       tp->bytes_acked += ack - prior_snd_una;
-               else if (icsk->icsk_ca_state == TCP_CA_Loss)
-                       /* we assume just one segment left network */
-                       tp->bytes_acked += min(ack - prior_snd_una,
-                                              tp->mss_cache);
-       }
-
        prior_fackets = tp->fackets_out;
        prior_in_flight = tcp_packets_in_flight(tp);
 
@@ -3872,7 +3860,7 @@ static bool tcp_parse_aligned_timestamp(struct tcp_sock *tp, const struct tcphdr
                ++ptr;
                tp->rx_opt.rcv_tsval = ntohl(*ptr);
                ++ptr;
-               tp->rx_opt.rcv_tsecr = ntohl(*ptr);
+               tp->rx_opt.rcv_tsecr = ntohl(*ptr) - tp->tsoffset;
                return true;
        }
        return false;
@@ -3896,7 +3884,11 @@ static bool tcp_fast_parse_options(const struct sk_buff *skb,
                if (tcp_parse_aligned_timestamp(tp, th))
                        return true;
        }
+
        tcp_parse_options(skb, &tp->rx_opt, hvpp, 1, NULL);
+       if (tp->rx_opt.saw_tstamp)
+               tp->rx_opt.rcv_tsecr -= tp->tsoffset;
+
        return true;
 }
 
@@ -5649,8 +5641,7 @@ static bool tcp_rcv_fastopen_synack(struct sock *sk, struct sk_buff *synack,
         * the remote receives only the retransmitted (regular) SYNs: either
         * the original SYN-data or the corresponding SYN-ACK is lost.
         */
-       syn_drop = (cookie->len <= 0 && data &&
-                   inet_csk(sk)->icsk_retransmits);
+       syn_drop = (cookie->len <= 0 && data && tp->total_retrans);
 
        tcp_fastopen_cache_set(sk, mss, cookie, syn_drop);
 
@@ -5678,6 +5669,8 @@ static int tcp_rcv_synsent_state_process(struct sock *sk, struct sk_buff *skb,
        int saved_clamp = tp->rx_opt.mss_clamp;
 
        tcp_parse_options(skb, &tp->rx_opt, &hash_location, 0, &foc);
+       if (tp->rx_opt.saw_tstamp)
+               tp->rx_opt.rcv_tsecr -= tp->tsoffset;
 
        if (th->ack) {
                /* rfc793: