diff options
| -rw-r--r-- | net/ipv4/tcp_input.c | 37 |
1 files changed, 28 insertions, 9 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 6a8eca916580..771e075d457d 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -102,6 +102,7 @@ int sysctl_tcp_max_orphans __read_mostly = NR_FILE; #define FLAG_NO_CHALLENGE_ACK 0x8000 /* do not call tcp_send_challenge_ack() */ #define FLAG_ACK_MAYBE_DELAYED 0x10000 /* Likely a delayed ACK */ #define FLAG_DSACK_TLP 0x20000 /* DSACK for tail loss probe */ +#define FLAG_TS_PROGRESS 0x40000 /* Positive timestamp delta */ #define FLAG_ACKED (FLAG_DATA_ACKED|FLAG_SYN_ACKED) #define FLAG_NOT_DUP (FLAG_DATA|FLAG_WIN_UPDATE|FLAG_ACKED) @@ -3821,8 +3822,16 @@ static void tcp_store_ts_recent(struct tcp_sock *tp) tp->rx_opt.ts_recent_stamp = ktime_get_seconds(); } -static void tcp_replace_ts_recent(struct tcp_sock *tp, u32 seq) +static int __tcp_replace_ts_recent(struct tcp_sock *tp, s32 tstamp_delta) { + tcp_store_ts_recent(tp); + return tstamp_delta > 0 ? FLAG_TS_PROGRESS : 0; +} + +static int tcp_replace_ts_recent(struct tcp_sock *tp, u32 seq) +{ + s32 delta; + if (tp->rx_opt.saw_tstamp && !after(seq, tp->rcv_wup)) { /* PAWS bug workaround wrt. ACK frames, the PAWS discard * extra check below makes sure this can only happen @@ -3831,9 +3840,13 @@ static void tcp_replace_ts_recent(struct tcp_sock *tp, u32 seq) * Not only, also it occurs for expired timestamps. */ - if (tcp_paws_check(&tp->rx_opt, 0)) - tcp_store_ts_recent(tp); + if (tcp_paws_check(&tp->rx_opt, 0)) { + delta = tp->rx_opt.rcv_tsval - tp->rx_opt.ts_recent; + return __tcp_replace_ts_recent(tp, delta); + } } + + return 0; } /* This routine deals with acks during a TLP episode and ends an episode by @@ -3990,7 +4003,7 @@ static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag) * is in window. */ if (flag & FLAG_UPDATE_TS_RECENT) - tcp_replace_ts_recent(tp, TCP_SKB_CB(skb)->seq); + flag |= tcp_replace_ts_recent(tp, TCP_SKB_CB(skb)->seq); if ((flag & (FLAG_SLOWPATH | FLAG_SND_UNA_ADVANCED)) == FLAG_SND_UNA_ADVANCED) { @@ -6165,6 +6178,8 @@ void tcp_rcv_established(struct sock *sk, struct sk_buff *skb) TCP_SKB_CB(skb)->seq == tp->rcv_nxt && !after(TCP_SKB_CB(skb)->ack_seq, tp->snd_nxt)) { int tcp_header_len = tp->tcp_header_len; + s32 delta = 0; + int flag = 0; /* Timestamp header prediction: tcp_header_len * is automatically equal to th->doff*4 due to pred_flags @@ -6177,8 +6192,10 @@ void tcp_rcv_established(struct sock *sk, struct sk_buff *skb) if (!tcp_parse_aligned_timestamp(tp, th)) goto slow_path; + delta = tp->rx_opt.rcv_tsval - + tp->rx_opt.ts_recent; /* If PAWS failed, check it more carefully in slow path */ - if ((s32)(tp->rx_opt.rcv_tsval - tp->rx_opt.ts_recent) < 0) + if (delta < 0) goto slow_path; /* DO NOT update ts_recent here, if checksum fails @@ -6198,12 +6215,13 @@ void tcp_rcv_established(struct sock *sk, struct sk_buff *skb) if (tcp_header_len == (sizeof(struct tcphdr) + TCPOLEN_TSTAMP_ALIGNED) && tp->rcv_nxt == tp->rcv_wup) - tcp_store_ts_recent(tp); + flag |= __tcp_replace_ts_recent(tp, + delta); /* We know that such packets are checksummed * on entry. */ - tcp_ack(sk, skb, 0); + tcp_ack(sk, skb, flag); __kfree_skb(skb); tcp_data_snd_check(sk); /* When receiving pure ack in fast path, update @@ -6234,7 +6252,8 @@ void tcp_rcv_established(struct sock *sk, struct sk_buff *skb) if (tcp_header_len == (sizeof(struct tcphdr) + TCPOLEN_TSTAMP_ALIGNED) && tp->rcv_nxt == tp->rcv_wup) - tcp_store_ts_recent(tp); + flag |= __tcp_replace_ts_recent(tp, + delta); tcp_rcv_rtt_measure_ts(sk, skb); @@ -6249,7 +6268,7 @@ void tcp_rcv_established(struct sock *sk, struct sk_buff *skb) if (TCP_SKB_CB(skb)->ack_seq != tp->snd_una) { /* Well, only one small jumplet in fast path... */ - tcp_ack(sk, skb, FLAG_DATA); + tcp_ack(sk, skb, flag | FLAG_DATA); tcp_data_snd_check(sk); if (!inet_csk_ack_scheduled(sk)) goto no_ack; |