diff options
Diffstat (limited to 'net/ipv4/tcp_input.c')
| -rw-r--r-- | net/ipv4/tcp_input.c | 642 |
1 files changed, 440 insertions, 202 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 1a14191687a..051f0f815f1 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -86,6 +86,7 @@ int sysctl_tcp_stdurg __read_mostly; int sysctl_tcp_rfc1337 __read_mostly; int sysctl_tcp_max_orphans __read_mostly = NR_FILE; int sysctl_tcp_frto __read_mostly; +int sysctl_tcp_frto_response __read_mostly; int sysctl_tcp_nometrics_save __read_mostly; int sysctl_tcp_moderate_rcvbuf __read_mostly = 1; @@ -100,6 +101,7 @@ int sysctl_tcp_abc __read_mostly; #define FLAG_ECE 0x40 /* ECE in this ACK */ #define FLAG_DATA_LOST 0x80 /* SACK detected data lossage. */ #define FLAG_SLOWPATH 0x100 /* Do not skip RFC checks for window update.*/ +#define FLAG_ONLY_ORIG_SACKED 0x200 /* SACKs only non-rexmit sent before RTO */ #define FLAG_ACKED (FLAG_DATA_ACKED|FLAG_SYN_ACKED) #define FLAG_NOT_DUP (FLAG_DATA|FLAG_WIN_UPDATE|FLAG_ACKED) @@ -110,6 +112,8 @@ int sysctl_tcp_abc __read_mostly; #define IsFack(tp) ((tp)->rx_opt.sack_ok & 2) #define IsDSack(tp) ((tp)->rx_opt.sack_ok & 4) +#define IsSackFrto() (sysctl_tcp_frto == 0x2) + #define TCP_REMNANT (TCP_FLAG_FIN|TCP_FLAG_URG|TCP_FLAG_SYN|TCP_FLAG_PSH) /* Adapt the MSS value used to make delayed ack decision to the @@ -136,7 +140,7 @@ static void tcp_measure_rcv_mss(struct sock *sk, * * "len" is invariant segment length, including TCP header. */ - len += skb->data - skb->h.raw; + len += skb->data - skb_transport_header(skb); if (len >= TCP_MIN_RCVMSS + sizeof(struct tcphdr) || /* If PSH is not set, packet should be * full sized, provided peer TCP is not badly broken. @@ -144,7 +148,7 @@ static void tcp_measure_rcv_mss(struct sock *sk, * to handle super-low mtu links fairly. */ (len >= TCP_MIN_MSS + sizeof(struct tcphdr) && - !(tcp_flag_word(skb->h.th)&TCP_REMNANT))) { + !(tcp_flag_word(tcp_hdr(skb)) & TCP_REMNANT))) { /* Subtract also invariant (if peer is RFC compliant), * tcp header plus fixed timestamp option length. * Resulting "len" is MSS free of SACK jitter. @@ -231,9 +235,9 @@ static void tcp_fixup_sndbuf(struct sock *sk) */ /* Slow part of check#2. */ -static int __tcp_grow_window(const struct sock *sk, struct tcp_sock *tp, - const struct sk_buff *skb) +static int __tcp_grow_window(const struct sock *sk, const struct sk_buff *skb) { + struct tcp_sock *tp = tcp_sk(sk); /* Optimize this! */ int truesize = tcp_win_from_space(skb->truesize)/2; int window = tcp_win_from_space(sysctl_tcp_rmem[2])/2; @@ -248,9 +252,11 @@ static int __tcp_grow_window(const struct sock *sk, struct tcp_sock *tp, return 0; } -static void tcp_grow_window(struct sock *sk, struct tcp_sock *tp, +static void tcp_grow_window(struct sock *sk, struct sk_buff *skb) { + struct tcp_sock *tp = tcp_sk(sk); + /* Check #1 */ if (tp->rcv_ssthresh < tp->window_clamp && (int)tp->rcv_ssthresh < tcp_space(sk) && @@ -263,7 +269,7 @@ static void tcp_grow_window(struct sock *sk, struct tcp_sock *tp, if (tcp_win_from_space(skb->truesize) <= skb->len) incr = 2*tp->advmss; else - incr = __tcp_grow_window(sk, tp, skb); + incr = __tcp_grow_window(sk, skb); if (incr) { tp->rcv_ssthresh = min(tp->rcv_ssthresh + incr, tp->window_clamp); @@ -326,8 +332,9 @@ static void tcp_init_buffer_space(struct sock *sk) } /* 5. Recalculate window clamp after socket hit its memory bounds. */ -static void tcp_clamp_window(struct sock *sk, struct tcp_sock *tp) +static void tcp_clamp_window(struct sock *sk) { + struct tcp_sock *tp = tcp_sk(sk); struct inet_connection_sock *icsk = inet_csk(sk); icsk->icsk_ack.quick = 0; @@ -499,8 +506,9 @@ new_measure: * each ACK we send, he increments snd_cwnd and transmits more of his * queue. -DaveM */ -static void tcp_event_data_recv(struct sock *sk, struct tcp_sock *tp, struct sk_buff *skb) +static void tcp_event_data_recv(struct sock *sk, struct sk_buff *skb) { + struct tcp_sock *tp = tcp_sk(sk); struct inet_connection_sock *icsk = inet_csk(sk); u32 now; @@ -541,7 +549,7 @@ static void tcp_event_data_recv(struct sock *sk, struct tcp_sock *tp, struct sk_ TCP_ECN_check_ce(tp, skb); if (skb->len >= 128) - tcp_grow_window(sk, tp, skb); + tcp_grow_window(sk, skb); } /* Called to compute a smoothed rtt estimate. The data fed to this @@ -574,7 +582,7 @@ static void tcp_rtt_estimator(struct sock *sk, const __u32 mrtt) * does not matter how to _calculate_ it. Seems, it was trap * that VJ failed to avoid. 8) */ - if(m == 0) + if (m == 0) m = 1; if (tp->srtt != 0) { m -= (tp->srtt >> 3); /* m is now error in rtt est */ @@ -759,15 +767,17 @@ __u32 tcp_init_cwnd(struct tcp_sock *tp, struct dst_entry *dst) } /* Set slow start threshold and cwnd not falling to slow start */ -void tcp_enter_cwr(struct sock *sk) +void tcp_enter_cwr(struct sock *sk, const int set_ssthresh) { struct tcp_sock *tp = tcp_sk(sk); + const struct inet_connection_sock *icsk = inet_csk(sk); tp->prior_ssthresh = 0; tp->bytes_acked = 0; - if (inet_csk(sk)->icsk_ca_state < TCP_CA_CWR) { + if (icsk->icsk_ca_state < TCP_CA_CWR) { tp->undo_marker = 0; - tp->snd_ssthresh = inet_csk(sk)->icsk_ca_ops->ssthresh(sk); + if (set_ssthresh) + tp->snd_ssthresh = icsk->icsk_ca_ops->ssthresh(sk); tp->snd_cwnd = min(tp->snd_cwnd, tcp_packets_in_flight(tp) + 1U); tp->snd_cwnd_cnt = 0; @@ -934,7 +944,8 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_ { const struct inet_connection_sock *icsk = inet_csk(sk); struct tcp_sock *tp = tcp_sk(sk); - unsigned char *ptr = ack_skb->h.raw + TCP_SKB_CB(ack_skb)->sacked; + unsigned char *ptr = (skb_transport_header(ack_skb) + + TCP_SKB_CB(ack_skb)->sacked); struct tcp_sack_block_wire *sp = (struct tcp_sack_block_wire *)(ptr+2); struct sk_buff *cached_skb; int num_sacks = (ptr[1] - TCPOLEN_SACK_BASE)>>3; @@ -1038,7 +1049,7 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_ cached_skb = tp->fastpath_skb_hint; cached_fack_count = tp->fastpath_cnt_hint; if (!cached_skb) { - cached_skb = sk->sk_write_queue.next; + cached_skb = tcp_write_queue_head(sk); cached_fack_count = 0; } @@ -1055,10 +1066,13 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_ if (after(end_seq, tp->high_seq)) flag |= FLAG_DATA_LOST; - sk_stream_for_retrans_queue_from(skb, sk) { + tcp_for_write_queue_from(skb, sk) { int in_sack, pcount; u8 sacked; + if (skb == tcp_send_head(sk)) + break; + cached_skb = skb; cached_fack_count = fack_count; if (i == first_sack_index) { @@ -1159,6 +1173,18 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_ /* clear lost hint */ tp->retransmit_skb_hint = NULL; } + /* SACK enhanced F-RTO detection. + * Set flag if and only if non-rexmitted + * segments below frto_highmark are + * SACKed (RFC4138; Appendix B). + * Clearing correct due to in-order walk + */ + if (after(end_seq, tp->frto_highmark)) { + flag &= ~FLAG_ONLY_ORIG_SACKED; + } else { + if (!(sacked & TCPCB_RETRANS)) + flag |= FLAG_ONLY_ORIG_SACKED; + } } TCP_SKB_CB(skb)->sacked |= TCPCB_SACKED_ACKED; @@ -1195,7 +1221,9 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_ if (lost_retrans && icsk->icsk_ca_state == TCP_CA_Recovery) { struct sk_buff *skb; - sk_stream_for_retrans_queue(skb, sk) { + tcp_for_write_queue(skb, sk) { + if (skb == tcp_send_head(sk)) + break; if (after(TCP_SKB_CB(skb)->seq, lost_retrans)) break; if (!after(TCP_SKB_CB(skb)->end_seq, tp->snd_una)) @@ -1224,7 +1252,8 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_ tp->left_out = tp->sacked_out + tp->lost_out; - if ((reord < tp->fackets_out) && icsk->icsk_ca_state != TCP_CA_Loss) + if ((reord < tp->fackets_out) && icsk->icsk_ca_state != TCP_CA_Loss && + (!tp->frto_highmark || after(tp->snd_una, tp->frto_highmark))) tcp_update_reordering(sk, ((tp->fackets_out + 1) - reord), 0); #if FASTRETRANS_DEBUG > 0 @@ -1236,9 +1265,54 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_ return flag; } -/* RTO occurred, but do not yet enter loss state. Instead, transmit two new - * segments to see from the next ACKs whether any data was really missing. - * If the RTO was spurious, new ACKs should arrive. +/* F-RTO can only be used if these conditions are satisfied: + * - there must be some unsent new data + * - the advertised window should allow sending it + * - TCP has never retransmitted anything other than head (SACK enhanced + * variant from Appendix B of RFC4138 is more robust here) + */ +int tcp_use_frto(struct sock *sk) +{ + const struct tcp_sock *tp = tcp_sk(sk); + struct sk_buff *skb; + + if (!sysctl_tcp_frto || !tcp_send_head(sk) || + after(TCP_SKB_CB(tcp_send_head(sk))->end_seq, + tp->snd_una + tp->snd_wnd)) + return 0; + + if (IsSackFrto()) + return 1; + + /* Avoid expensive walking of rexmit queue if possible */ + if (tp->retrans_out > 1) + return 0; + + skb = tcp_write_queue_head(sk); + skb = tcp_write_queue_next(sk, skb); /* Skips head */ + tcp_for_write_queue_from(skb, sk) { + if (skb == tcp_send_head(sk)) + break; + if (TCP_SKB_CB(skb)->sacked&TCPCB_RETRANS) + return 0; + /* Short-circuit when first non-SACKed skb has been checked */ + if (!(TCP_SKB_CB(skb)->sacked&TCPCB_SACKED_ACKED)) + break; + } + return 1; +} + +/* RTO occurred, but do not yet enter Loss state. Instead, defer RTO + * recovery a bit and use heuristics in tcp_process_frto() to detect if + * the RTO was spurious. Only clear SACKED_RETRANS of the head here to + * keep retrans_out counting accurate (with SACK F-RTO, other than head + * may still have that bit set); TCPCB_LOST and remaining SACKED_RETRANS + * bits are handled if the Loss state is really to be entered (in + * tcp_enter_frto_loss). + * + * Do like tcp_enter_loss() would; when RTO expires the second time it + * does: + * "Reduce ssthresh if it has not yet been made inside this window." */ void tcp_enter_frto(struct sock *sk) { @@ -1246,39 +1320,69 @@ void tcp_enter_frto(struct sock *sk) struct tcp_sock *tp = tcp_sk(sk); struct sk_buff *skb; - tp->frto_counter = 1; - - if (icsk->icsk_ca_state <= TCP_CA_Disorder || + if ((!tp->frto_counter && icsk->icsk_ca_state <= TCP_CA_Disorder) || tp->snd_una == tp->high_seq || - (icsk->icsk_ca_state == TCP_CA_Loss && !icsk->icsk_retransmits)) { + ((icsk->icsk_ca_state == TCP_CA_Loss || tp->frto_counter) && + !icsk->icsk_retransmits)) { tp->prior_ssthresh = tcp_current_ssthresh(sk); - tp->snd_ssthresh = icsk->icsk_ca_ops->ssthresh(sk); + /* Our state is too optimistic in ssthresh() call because cwnd + * is not reduced until tcp_enter_frto_loss() when previous FRTO + * recovery has not yet completed. Pattern would be this: RTO, + * Cumulative ACK, RTO (2xRTO for the same segment does not end + * up here twice). + * RFC4138 should be more specific on what to do, even though + * RTO is quite unlikely to occur after the first Cumulative ACK + * due to back-off and complexity of triggering events ... + */ + if (tp->frto_counter) { + u32 stored_cwnd; + stored_cwnd = tp->snd_cwnd; + tp->snd_cwnd = 2; + tp->snd_ssthresh = icsk->icsk_ca_ops->ssthresh(sk); + tp->snd_cwnd = stored_cwnd; + } else { + tp->snd_ssthresh = icsk->icsk_ca_ops->ssthresh(sk); + } + /* ... in theory, cong.control module could do "any tricks" in + * ssthresh(), which means that ca_state, lost bits and lost_out + * counter would have to be faked before the call occurs. We + * consider that too expensive, unlikely and hacky, so modules + * using these in ssthresh() must deal these incompatibility + * issues if they receives CA_EVENT_FRTO and frto_counter != 0 + */ tcp_ca_event(sk, CA_EVENT_FRTO); } - /* Have to clear retransmission markers here to keep the bookkeeping - * in shape, even though we are not yet in Loss state. - * If something was really lost, it is eventually caught up - * in tcp_enter_frto_loss. - */ - tp->retrans_out = 0; tp->undo_marker = tp->snd_una; tp->undo_retrans = 0; - sk_stream_for_retrans_queue(skb, sk) { - TCP_SKB_CB(skb)->sacked &= ~TCPCB_RETRANS; + skb = tcp_write_queue_head(sk); + if (TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_RETRANS) { + TCP_SKB_CB(skb)->sacked &= ~TCPCB_SACKED_RETRANS; + tp->retrans_out -= tcp_skb_pcount(skb); } tcp_sync_left_out(tp); - tcp_set_ca_state(sk, TCP_CA_Open); - tp->frto_highmark = tp->snd_nxt; + /* Earlier loss recovery underway (see RFC4138; Appendix B). + * The last condition is necessary at least in tp->frto_counter case. + */ + if (IsSackFrto() && (tp->frto_counter || + ((1 << icsk->icsk_ca_state) & (TCPF_CA_Recovery|TCPF_CA_Loss))) && + after(tp->high_seq, tp->snd_una)) { + tp->frto_highmark = tp->high_seq; + } else { + tp->frto_highmark = tp->snd_nxt; + } + tcp_set_ca_state(sk, TCP_CA_Disorder); + tp->high_seq = tp->snd_nxt; + tp->frto_counter = 1; } /* Enter Loss state after F-RTO was applied. Dupack arrived after RTO, * which indicates that we should follow the traditional RTO recovery, * i.e. mark everything lost and do go-back-N retransmission. */ -static void tcp_enter_frto_loss(struct sock *sk) +static void tcp_enter_frto_loss(struct sock *sk, int allowed_segments, int flag) { struct tcp_sock *tp = tcp_sk(sk); struct sk_buff *skb; @@ -1287,10 +1391,23 @@ static void tcp_enter_frto_loss(struct sock *sk) tp->sacked_out = 0; tp->lost_out = 0; tp->fackets_out = 0; + tp->retrans_out = 0; - sk_stream_for_retrans_queue(skb, sk) { + tcp_for_write_queue(skb, sk) { + if (skb == tcp_send_head(sk)) + break; cnt += tcp_skb_pcount(skb); - TCP_SKB_CB(skb)->sacked &= ~TCPCB_LOST; + /* + * Count the retransmission made on RTO correctly (only when + * waiting for the first ACK and did not get it)... + */ + if ((tp->frto_counter == 1) && !(flag&FLAG_DATA_ACKED)) { + tp->retrans_out += tcp_skb_pcount(skb); + /* ...enter this if branch just for the first segment */ + flag |= FLAG_DATA_ACKED; + } else { + TCP_SKB_CB(skb)->sacked &= ~(TCPCB_LOST|TCPCB_SACKED_RETRANS); + } if (!(TCP_SKB_CB(skb)->sacked&TCPCB_SACKED_ACKED)) { /* Do not mark those segments lost that were @@ -1308,7 +1425,7 @@ static void tcp_enter_frto_loss(struct sock *sk) } tcp_sync_left_out(tp); - tp->snd_cwnd = tp->frto_counter + tcp_packets_in_flight(tp)+1; + tp->snd_cwnd = tcp_packets_in_flight(tp) + allowed_segments; tp->snd_cwnd_cnt = 0; tp->snd_cwnd_stamp = tcp_time_stamp; tp->undo_marker = 0; @@ -1366,7 +1483,9 @@ void tcp_enter_loss(struct sock *sk, int how) if (!how) tp->undo_marker = tp->snd_una; - sk_stream_for_retrans_queue(skb, sk) { + tcp_for_write_queue(skb, sk) { + if (skb == tcp_send_head(sk)) + break; cnt += tcp_skb_pcount(skb); if (TCP_SKB_CB(skb)->sacked&TCPCB_RETRANS) tp->undo_marker = 0; @@ -1401,14 +1520,14 @@ static int tcp_check_sack_reneging(struct sock *sk) * receiver _host_ is heavily congested (or buggy). * Do processing similar to RTO timeout. */ - if ((skb = skb_peek(&sk->sk_write_queue)) != NULL && + if ((skb = tcp_write_queue_head(sk)) != NULL && (TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_ACKED)) { struct inet_connection_sock *icsk = inet_csk(sk); NET_INC_STATS_BH(LINUX_MIB_TCPSACKRENEGING); tcp_enter_loss(sk, 1); icsk->icsk_retransmits++; - tcp_retransmit_skb(sk, skb_peek(&sk->sk_write_queue)); + tcp_retransmit_skb(sk, tcp_write_queue_head(sk)); inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, icsk->icsk_rto, TCP_RTO_MAX); return 1; @@ -1426,10 +1545,12 @@ static inline int tcp_skb_timedout(struct sock *sk, struct sk_buff *skb) return (tcp_time_stamp - TCP_SKB_CB(skb)->when > inet_csk(sk)->icsk_rto); } -static inline int tcp_head_timedout(struct sock *sk, struct tcp_sock *tp) +static inline int tcp_head_timedout(struct sock *sk) { + struct tcp_sock *tp = tcp_sk(sk); + return tp->packets_out && - tcp_skb_timedout(sk, skb_peek(&sk->sk_write_queue)); + tcp_skb_timedout(sk, tcp_write_queue_head(sk)); } /* Linux NewReno/SACK/FACK/ECN state machine. @@ -1525,10 +1646,15 @@ static inline int tcp_head_timedout(struct sock *sk, struct tcp_sock *tp) * Main question: may we further continue forward transmission * with the same cwnd? */ -static int tcp_time_to_recover(struct sock *sk, struct tcp_sock *tp) +static int tcp_time_to_recover(struct sock *sk) { + struct tcp_sock *tp = tcp_sk(sk); __u32 packets_out; + /* Do not perform any recovery during FRTO algorithm */ + if (tp->frto_counter) + return 0; + /* Trick#1: The loss is proven. */ if (tp->lost_out) return 1; @@ -1540,7 +1666,7 @@ static int tcp_time_to_recover(struct sock *sk, struct tcp_sock *tp) /* Trick#3 : when we use RFC2988 timer restart, fast * retransmit can be triggered by timeout of queue head. */ - if (tcp_head_timedout(sk, tp)) + if (tcp_head_timedout(sk)) return 1; /* Trick#4: It is still not OK... But will it be useful to delay @@ -1549,7 +1675,7 @@ static int tcp_time_to_recover(struct sock *sk, struct tcp_sock *tp) packets_out = tp->packets_out; if (packets_out <= tp->reordering && tp->sacked_out >= max_t(__u32, packets_out/2, sysctl_tcp_reordering) && - !tcp_may_send_now(sk, tp)) { + !tcp_may_send_now(sk)) { /* We have nothing to send. This connection is limited * either by receiver window or by application. */ @@ -1589,8 +1715,10 @@ static void tcp_add_reno_sack(struct sock *sk) /* Account for ACK, ACKing some data in Reno Recovery phase. */ -static void tcp_remove_reno_sacks(struct sock *sk, struct tcp_sock *tp, int acked) +static void tcp_remove_reno_sacks(struct sock *sk, int acked) { + struct tcp_sock *tp = tcp_sk(sk); + if (acked > 0) { /* One ACK acked hole. The rest eat duplicate ACKs. */ if (acked-1 >= tp->sacked_out) @@ -1609,9 +1737,10 @@ static inline void tcp_reset_reno_sack(struct tcp_sock *tp) } /* Mark head of queue up as lost. */ -static void tcp_mark_head_lost(struct sock *sk, struct tcp_sock *tp, +static void tcp_mark_head_lost(struct sock *sk, int packets, u32 high_seq) { + struct tcp_sock *tp = tcp_sk(sk); struct sk_buff *skb; int cnt; @@ -1620,11 +1749,13 @@ static void tcp_mark_head_lost(struct sock *sk, struct tcp_sock *tp, skb = tp->lost_skb_hint; cnt = tp->lost_cnt_hint; } else { - skb = sk->sk_write_queue.next; + skb = tcp_write_queue_head(sk); cnt = 0; } - sk_stream_for_retrans_queue_from(skb, sk) { + tcp_for_write_queue_from(skb, sk) { + if (skb == tcp_send_head(sk)) + break; /* TODO: do this better */ /* this is not the most efficient way to do this... */ tp->lost_skb_hint = skb; @@ -1638,12 +1769,11 @@ static void tcp_mark_head_lost(struct sock *sk, struct tcp_sock *tp, /* clear xmit_retransmit_queue hints * if this is beyond hint */ - if(tp->retransmit_skb_hint != NULL && - before(TCP_SKB_CB(skb)->seq, - TCP_SKB_CB(tp->retransmit_skb_hint)->seq)) { - + if (tp->retransmit_skb_hint != NULL && + before(TCP_SKB_CB(skb)->seq, + TCP_SKB_CB(tp->retransmit_skb_hint)->seq)) tp->retransmit_skb_hint = NULL; - } + } } tcp_sync_left_out(tp); @@ -1651,15 +1781,17 @@ static void tcp_mark_head_lost(struct sock *sk, struct tcp_sock *tp, /* Account newly detected lost packet(s) */ -static void tcp_update_scoreboard(struct sock *sk, struct tcp_sock *tp) +static void tcp_update_scoreboard(struct sock *sk) { + struct tcp_sock *tp = tcp_sk(sk); + if (IsFack(tp)) { int lost = tp->fackets_out - tp->reordering; if (lost <= 0) lost = 1; - tcp_mark_head_lost(sk, tp, lost, tp->high_seq); + tcp_mark_head_lost(sk, lost, tp->high_seq); } else { - tcp_mark_head_lost(sk, tp, 1, tp->high_seq); + tcp_mark_head_lost(sk, 1, tp->high_seq); } /* New heuristics: it is possible only after we switched @@ -1667,13 +1799,15 @@ static void tcp_update_scoreboard(struct sock *sk, struct tcp_sock *tp) * Hence, we can detect timed out packets during fast * retransmit without falling to slow start. */ - if (!IsReno(tp) && tcp_head_timedout(sk, tp)) { + if (!IsReno(tp) && tcp_head_timedout(sk)) { struct sk_buff *skb; skb = tp->scoreboard_skb_hint ? tp->scoreboard_skb_hint - : sk->sk_write_queue.next; + : tcp_write_queue_head(sk); - sk_stream_for_retrans_queue_from(skb, sk) { + tcp_for_write_queue_from(skb, sk) { + if (skb == tcp_send_head(sk)) + break; if (!tcp_skb_timedout(sk, skb)) break; @@ -1745,9 +1879,11 @@ static inline int tcp_packet_delayed(struct tcp_sock *tp) /* Undo procedures. */ #if FASTRETRANS_DEBUG > 1 -static void DBGUNDO(struct sock *sk, struct tcp_sock *tp, const char *msg) +static void DBGUNDO(struct sock *sk, const char *msg) { + struct tcp_sock *tp = tcp_sk(sk); struct inet_sock *inet = inet_sk(sk); + printk(KERN_DEBUG "Undo %s %u.%u.%u.%u/%u c%u l%u ss%u/%u p%u\n", msg, NIPQUAD(inet->daddr), ntohs(inet->dport), @@ -1793,13 +1929,15 @@ static inline int tcp_may_undo(struct tcp_sock *tp) } /* People celebrate: "We love our President!" */ -static int tcp_try_undo_recovery(struct sock *sk, struct tcp_sock *tp) +static int tcp_try_undo_recovery(struct sock *sk) { + struct tcp_sock *tp = tcp_sk(sk); + if (tcp_may_undo(tp)) { /* Happy end! We did not retransmit anything * or our original transmission succeeded. */ - DBGUNDO(sk, tp, inet_csk(sk)->icsk_ca_state == TCP_CA_Loss ? "loss" : "retrans"); + DBGUNDO(sk, inet_csk(sk)->icsk_ca_state == TCP_CA_Loss ? "loss" : "retrans"); tcp_undo_cwr(sk, 1); if (inet_csk(sk)->icsk_ca_state == TCP_CA_Loss) NET_INC_STATS_BH(LINUX_MIB_TCPLOSSUNDO); @@ -1819,10 +1957,12 @@ static int tcp_try_undo_recovery(struct sock *sk, struct tcp_sock *tp) } /* Try to undo cwnd reduction, because D-SACKs acked all retransmitted data */ -static void tcp_try_undo_dsack(struct sock *sk, struct tcp_sock *tp) +static void tcp_try_undo_dsack(struct sock *sk) { + struct tcp_sock *tp = tcp_sk(sk); + if (tp->undo_marker && !tp->undo_retrans) { - DBGUNDO(sk, tp, "D-SACK"); + DBGUNDO(sk, "D-SACK"); tcp_undo_cwr(sk, 1); tp->undo_marker = 0; NET_INC_STATS_BH(LINUX_MIB_TCPDSACKUNDO); @@ -1831,9 +1971,9 @@ static void tcp_try_undo_dsack(struct sock *sk, struct tcp_sock *tp) /* Undo during fast recovery after partial ACK. */ -static int tcp_try_undo_partial(struct sock *sk, struct tcp_sock *tp, - int acked) +static int tcp_try_undo_partial(struct sock *sk, int acked) { + struct tcp_sock *tp = tcp_sk(sk); /* Partial ACK arrived. Force Hoe's retransmit. */ int failed = IsReno(tp) || tp->fackets_out>tp->reordering; @@ -1846,7 +1986,7 @@ static int tcp_try_undo_partial(struct sock *sk, struct tcp_sock *tp, tcp_update_reordering(sk, tcp_fackets_out(tp) + acked, 1); - DBGUNDO(sk, tp, "Hoe"); + DBGUNDO(sk, "Hoe"); tcp_undo_cwr(sk, 0); NET_INC_STATS_BH(LINUX_MIB_TCPPARTIALUNDO); @@ -1860,17 +2000,21 @@ static int tcp_try_undo_partial(struct sock *sk, struct tcp_sock *tp, } /* Undo during loss recovery after partial ACK. */ -static int tcp_try_undo_loss(struct sock *sk, struct tcp_sock *tp) +static int tcp_try_undo_loss(struct sock *sk) { + struct tcp_sock *tp = tcp_sk(sk); + if (tcp_may_undo(tp)) { struct sk_buff *skb; - sk_stream_for_retrans_queue(skb, sk) { + tcp_for_write_queue(skb, sk) { + if (skb == tcp_send_head(sk)) + break; TCP_SKB_CB(skb)->sacked &= ~TCPCB_LOST; } clear_all_retrans_hints(tp); - DBGUNDO(sk, tp, "partial loss"); + DBGUNDO(sk, "partial loss"); tp->lost_out = 0; tp->left_out = tp->sacked_out; tcp_undo_cwr(sk, 1); @@ -1892,15 +2036,17 @@ static inline void tcp_complete_cwr(struct sock *sk) tcp_ca_event(sk, CA_EVENT_COMPLETE_CWR); } -static void tcp_try_to_open(struct sock *sk, struct tcp_sock *tp, int flag) +static void tcp_try_to_open(struct sock *sk, int flag) { + struct tcp_sock *tp = tcp_sk(sk); + tp->left_out = tp->sacked_out; if (tp->retrans_out == 0) tp->retrans_stamp = 0; if (flag&FLAG_ECE) - tcp_enter_cwr(sk); + tcp_enter_cwr(sk, 1); if (inet_csk(sk)->icsk_ca_state != TCP_CA_CWR) { int state = TCP_CA_Open; @@ -1987,7 +2133,7 @@ tcp_fastretrans_alert(struct sock *sk, u32 prior_snd_una, before(tp->snd_una, tp->high_seq) && icsk->icsk_ca_state != TCP_CA_Open && tp->fackets_out > tp->reordering) { - tcp_mark_head_lost(sk, tp, tp->fackets_out-tp->reordering, tp->high_seq); + tcp_mark_head_lost(sk, tp->fackets_out-tp->reordering, tp->high_seq); NET_INC_STATS_BH(LINUX_MIB_TCPLOSS); } @@ -1997,14 +2143,13 @@ tcp_fastretrans_alert(struct sock *sk, u32 prior_snd_una, /* E. Check state exit conditions. State can be terminated * when high_seq is ACKed. */ if (icsk->icsk_ca_state == TCP_CA_Open) { - if (!sysctl_tcp_frto) - BUG_TRAP(tp->retrans_out == 0); + BUG_TRAP(tp->retrans_out == 0); tp->retrans_stamp = 0; } else if (!before(tp->snd_una, tp->high_seq)) { switch (icsk->icsk_ca_state) { case TCP_CA_Loss: icsk->icsk_retransmits = 0; - if (tcp_try_undo_recovery(sk, tp)) + if (tcp_try_undo_recovery(sk)) return; break; @@ -2018,7 +2163,7 @@ tcp_fastretrans_alert(struct sock *sk, u32 prior_snd_una, break; case TCP_CA_Disorder: - tcp_try_undo_dsack(sk, tp); + tcp_try_undo_dsack(sk); if (!tp->undo_marker || /* For SACK case do not Open to allow to undo * catching for all duplicate ACKs. */ @@ -2031,7 +2176,7 @@ tcp_fastretrans_alert(struct sock *sk, u32 prior_snd_una, case TCP_CA_Recovery: if (IsReno(tp)) tcp_reset_reno_sack(tp); - if (tcp_try_undo_recovery(sk, tp)) + if (tcp_try_undo_recovery(sk)) return; tcp_complete_cwr(sk); break; @@ -2047,14 +2192,14 @@ tcp_fastretrans_alert(struct sock *sk, u32 prior_snd_una, } else { int acked = prior_packets - tp->packets_out; if (IsReno(tp)) - tcp_remove_reno_sacks(sk, tp, acked); - is_dupack = tcp_try_undo_partial(sk, tp, acked); + tcp_remove_reno_sacks(sk, acked); + is_dupack = tcp_try_undo_partial(sk, acked); } break; case TCP_CA_Loss: if (flag&FLAG_DATA_ACKED) icsk->icsk_retransmits = 0; - if (!tcp_try_undo_loss(sk, tp)) { + if (!tcp_try_undo_loss(sk)) { tcp_moderate_cwnd(tp); tcp_xmit_retransmit_queue(sk); return; @@ -2071,10 +2216,10 @@ tcp_fastretrans_alert(struct sock *sk, u32 prior_snd_una, } if (icsk->icsk_ca_state == TCP_CA_Disorder) - tcp_try_undo_dsack(sk, tp); + tcp_try_undo_dsack(sk); - if (!tcp_time_to_recover(sk, tp)) { - tcp_try_to_open(sk, tp, flag); + if (!tcp_time_to_recover(sk)) { + tcp_try_to_open(sk, flag); return; } @@ -2113,8 +2258,8 @@ tcp_fastretrans_alert(struct sock *sk, u32 prior_snd_una, tcp_set_ca_state(sk, TCP_CA_Recovery); } - if (is_dupack || tcp_head_timedout(sk, tp)) - tcp_update_scoreboard(sk, tp); + if (is_dupack || tcp_head_timedout(sk)) + tcp_update_scoreboard(sk); tcp_cwnd_down(sk); tcp_xmit_retransmit_queue(sk); } @@ -2190,8 +2335,10 @@ static void tcp_cong_avoid(struct sock *sk, u32 ack, u32 rtt, * RFC2988 recommends to restart timer to now+rto. */ -static void tcp_ack_packets_out(struct sock *sk, struct tcp_sock *tp) +static void tcp_ack_packets_out(struct sock *sk) { + struct tcp_sock *tp = tcp_sk(sk); + if (!tp->packets_out) { inet_csk_clear_xmit_timer(sk, ICSK_TIME_RETRANS); } else { @@ -2255,14 +2402,6 @@ static int tcp_tso_acked(struct sock *sk, struct sk_buff *skb, return acked; } -static u32 tcp_usrtt(struct timeval *tv) -{ - struct timeval now; - - do_gettimeofday(&now); - return (now.tv_sec - tv->tv_sec) * 1000000 + (now.tv_usec - tv->tv_usec); -} - /* Remove acknowledged frames from the retransmission queue. */ static int tcp_clean_rtx_queue(struct sock *sk, __s32 *seq_rtt_p) { @@ -2273,12 +2412,10 @@ static int tcp_clean_rtx_queue(struct sock *sk, __s32 *seq_rtt_p) int acked = 0; __s32 seq_rtt = -1; u32 pkts_acked = 0; - void (*rtt_sample)(struct sock *sk, u32 usrtt) - = icsk->icsk_ca_ops->rtt_sample; - struct timeval tv = { .tv_sec = 0, .tv_usec = 0 }; + ktime_t last_ackt = ktime_set(0,0); - while ((skb = skb_peek(&sk->sk_write_queue)) && - skb != sk->sk_send_head) { + while ((skb = tcp_write_queue_head(sk)) && + skb != tcp_send_head(sk)) { struct tcp_skb_cb *scb = TCP_SKB_CB(skb); __u8 sacked = scb->sacked; @@ -2318,13 +2455,13 @@ static int tcp_clean_rtx_queue(struct sock *sk, __s32 *seq_rtt_p) if (sacked) { if (sacked & TCPCB_RETRANS) { - if(sacked & TCPCB_SACKED_RETRANS) + if (sacked & TCPCB_SACKED_RETRANS) tp->retrans_out -= tcp_skb_pcount(skb); acked |= FLAG_RETRANS_DATA_ACKED; seq_rtt = -1; } else if (seq_rtt < 0) { seq_rtt = now - scb->when; - skb_get_timestamp(skb, &tv); + last_ackt = skb->tstamp; } if (sacked & TCPCB_SACKED_ACKED) tp->sacked_out -= tcp_skb_pcount(skb); @@ -2337,23 +2474,24 @@ static int tcp_clean_rtx_queue(struct sock *sk, __s32 *seq_rtt_p) } } else if (seq_rtt < 0) { seq_rtt = now - scb->when; - skb_get_timestamp(skb, &tv); + last_ackt = skb->tstamp; } tcp_dec_pcount_approx(&tp->fackets_out, skb); tcp_packets_out_dec(tp, skb); - __skb_unlink(skb, &sk->sk_write_queue); + tcp_unlink_write_queue(skb, sk); sk_stream_free_skb(sk, skb); clear_all_retrans_hints(tp); } if (acked&FLAG_ACKED) { + const struct tcp_congestion_ops *ca_ops + = inet_csk(sk)->icsk_ca_ops; + tcp_ack_update_rtt(sk, acked, seq_rtt); - tcp_ack_packets_out(sk, tp); - if (rtt_sample && !(acked & FLAG_RETRANS_DATA_ACKED)) - (*rtt_sample)(sk, tcp_usrtt(&tv)); + tcp_ack_packets_out(sk); - if (icsk->icsk_ca_ops->pkts_acked) - icsk->icsk_ca_ops->pkts_acked(sk, pkts_acked); + if (ca_ops->pkts_acked) + ca_ops->pkts_acked(sk, pkts_acked, last_ackt); } #if FASTRETRANS_DEBUG > 0 @@ -2390,7 +2528,7 @@ static void tcp_ack_probe(struct sock *sk) /* Was it a usable window open? */ - if (!after(TCP_SKB_CB(sk->sk_send_head)->end_seq, + if (!after(TCP_SKB_CB(tcp_send_head(sk))->end_seq, tp->snd_una + tp->snd_wnd)) { icsk->icsk_backoff = 0; inet_csk_clear_xmit_timer(sk, ICSK_TIME_PROBE0); @@ -2433,13 +2571,14 @@ static inline int tcp_may_update_window(const struct tcp_sock *tp, const u32 ack * Window update algorithm, described in RFC793/RFC1122 (used in linux-2.2 * and in FreeBSD. NetBSD's one is even worse.) is wrong. */ -static int tcp_ack_update_window(struct sock *sk, struct tcp_sock *tp, - struct sk_buff *skb, u32 ack, u32 ack_seq) +static int tcp_ack_update_window(struct sock *sk, struct sk_buff *skb, u32 ack, + u32 ack_seq) { + struct tcp_sock *tp = tcp_sk(sk); int flag = 0; - u32 nwin = ntohs(skb->h.th->window); + u32 nwin = ntohs(tcp_hdr(skb)->window); - if (likely(!skb->h.th->syn)) + if (likely(!tcp_hdr(skb)->syn)) nwin <<= tp->rx_opt.snd_wscale; if (tcp_may_update_window(tp, ack, ack_seq, nwin)) { @@ -2453,7 +2592,7 @@ static int tcp_ack_update_window(struct sock *sk, struct tcp_sock *tp, * fast path is recovered for sending TCP. */ tp->pred_flags = 0; - tcp_fast_path_check(sk, tp); + tcp_fast_path_check(sk); if (nwin > tp->max_window) { tp->max_window = nwin; @@ -2467,39 +2606,128 @@ static int tcp_ack_update_window(struct sock *sk, struct tcp_sock *tp, return flag; } -static void tcp_process_frto(struct sock *sk, u32 prior_snd_una) +/* A very conservative spurious RTO response algorithm: reduce cwnd and + * continue in congestion avoidance. + */ +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; + tcp_moderate_cwnd(tp); +} + +/* A conservative spurious RTO response algorithm: reduce cwnd using + * rate halving and continue in congestion avoidance. + */ +static void tcp_ratehalving_spur_to_response(struct sock *sk) +{ + tcp_enter_cwr(sk, 0); +} + +static void tcp_undo_spur_to_response(struct sock *sk, int flag) +{ + if (flag&FLAG_ECE) + tcp_ratehalving_spur_to_response(sk); + else + tcp_undo_cwr(sk, 1); +} + +/* F-RTO spurious RTO detection algorithm (RFC4138) + * + * F-RTO affects during two new ACKs following RTO (well, almost, see inline + * comments). State (ACK number) is kept in frto_counter. When ACK advances + * window (but not to or beyond highest sequence sent before RTO): + * On First ACK, send two new segments out. + * On Second ACK, RTO was likely spurious. Do spurious response (response + * algorithm is not part of the F-RTO detection algorithm + * given in RFC4138 but can be selected separately). + * Otherwise (basically on duplicate ACK), RTO was (likely) caused by a loss + * and TCP falls back to conventional RTO recovery. + * + * Rationale: if the RTO was spurious, new ACKs should arrive from the + * original window even after we transmit two new data segments. + * + * SACK version: + * on first step, wait until first cumulative ACK arrives, then move to + * the second step. In second step, the next ACK decides. + * + * F-RTO is implemented (mainly) in four functions: + * - tcp_use_frto() is used to determine if TCP is can use F-RTO + * - tcp_enter_frto() prepares TCP state on RTO if F-RTO is used, it is + * called when tcp_use_frto() showed green light + * - tcp_process_frto() handles incoming ACKs during F-RTO algorithm + * - tcp_enter_frto_loss() is called if there is not enough evidence + * to prove that the RTO is indeed spurious. It transfers the control + * from F-RTO to the conventional RTO recovery + */ +static int tcp_process_frto(struct sock *sk, u32 prior_snd_una, int flag) { struct tcp_sock *tp = tcp_sk(sk); tcp_sync_left_out(tp); - if (tp->snd_una == prior_snd_una || - !before(tp->snd_una, tp->frto_highmark)) { - /* RTO was caused by loss, start retransmitting in - * go-back-N slow start - */ - tcp_enter_frto_loss(sk); - return; + /* Duplicate the behavior from Loss state (fastretrans_alert) */ + if (flag&FLAG_DATA_ACKED) + inet_csk(sk)->icsk_retransmits = 0; + + if (!before(tp->snd_una, tp->frto_highmark)) { + tcp_enter_frto_loss(sk, tp->frto_counter + 1, flag); + return 1; } - if (tp->frto_counter == 1) { - /* First ACK after RTO advances the window: allow two new - * segments out. + if (!IsSackFrto() || IsReno(tp)) { + /* RFC4138 shortcoming in step 2; should also have case c): + * ACK isn't duplicate nor advances window, e.g., opposite dir + * data, winupdate */ - tp->snd_cwnd = tcp_packets_in_flight(tp) + 2; + if ((tp->snd_una == prior_snd_una) && (flag&FLAG_NOT_DUP) && + !(flag&FLAG_FORWARD_PROGRESS)) + return 1; + + if (!(flag&FLAG_DATA_ACKED)) { + tcp_enter_frto_loss(sk, (tp->frto_counter == 1 ? 0 : 3), + flag); + return 1; + } } else { - /* Also the second ACK after RTO advances the window. - * The RTO was likely spurious. Reduce cwnd and continue - * in congestion avoidance - */ - tp->snd_cwnd = min(tp->snd_cwnd, tp->snd_ssthresh); - tcp_moderate_cwnd(tp); + if (!(flag&FLAG_DATA_ACKED) && (tp->frto_counter == 1)) { + /* Prevent sending of new data. */ + tp->snd_cwnd = min(tp->snd_cwnd, + tcp_packets_in_flight(tp)); + return 1; + } + + if ((tp->frto_counter == 2) && + (!(flag&FLAG_FORWARD_PROGRESS) || + ((flag&FLAG_DATA_SACKED) && !(flag&FLAG_ONLY_ORIG_SACKED)))) { + /* RFC4138 shortcoming (see comment above) */ + if (!(flag&FLAG_FORWARD_PROGRESS) && (flag&FLAG_NOT_DUP)) + return 1; + + tcp_enter_frto_loss(sk, 3, flag); + return 1; + } } - /* F-RTO affects on two new ACKs following RTO. - * At latest on third ACK the TCP behavior is back to normal. - */ - tp->frto_counter = (tp->frto_counter + 1) % 3; + if (tp->frto_counter == 1) { + tp->snd_cwnd = tcp_packets_in_flight(tp) + 2; + tp->frto_counter = 2; + return 1; + } else /* frto_counter == 2 */ { + switch (sysctl_tcp_frto_response) { + case 2: + tcp_undo_spur_to_response(sk, flag); + break; + case 1: + tcp_conservative_spur_to_response(tp); + break; + default: + tcp_ratehalving_spur_to_response(sk); + break; + } + tp->frto_counter = 0; + } + return 0; } /* This routine deals with incoming acks, but not outgoing ones. */ @@ -2513,6 +2741,7 @@ static int tcp_ack(struct sock *sk, struct sk_buff *skb, int flag) u32 prior_in_flight; s32 seq_rtt; int prior_packets; + int frto_cwnd = 0; /* If the ack is newer than sent or older than previous acks * then we can probably ignore it. @@ -2549,12 +2778,12 @@ static int tcp_ack(struct sock *sk, struct sk_buff *skb, int flag) else NET_INC_STATS_BH(LINUX_MIB_TCPPUREACKS); - flag |= tcp_ack_update_window(sk, tp, skb, ack, ack_seq); + flag |= tcp_ack_update_window(sk, skb, ack, ack_seq); if (TCP_SKB_CB(skb)->sacked) flag |= tcp_sacktag_write_queue(sk, skb, prior_snd_una); - if (TCP_ECN_rcv_ecn_echo(tp, skb->h.th)) + if (TCP_ECN_rcv_ecn_echo(tp, tcp_hdr(skb))) flag |= FLAG_ECE; tcp_ca_event(sk, CA_EVENT_SLOW_ACK); @@ -2575,15 +2804,16 @@ static int tcp_ack(struct sock *sk, struct sk_buff *skb, int flag) flag |= tcp_clean_rtx_queue(sk, &seq_rtt); if (tp->frto_counter) - tcp_process_frto(sk, prior_snd_una); + frto_cwnd = tcp_process_frto(sk, prior_snd_una, flag); if (tcp_ack_is_dubious(sk, flag)) { /* Advance CWND, if state allows this. */ - if ((flag & FLAG_DATA_ACKED) && tcp_may_raise_cwnd(sk, flag)) + if ((flag & FLAG_DATA_ACKED) && !frto_cwnd && + tcp_may_raise_cwnd(sk, flag)) tcp_cong_avoid(sk, ack, seq_rtt, prior_in_flight, 0); tcp_fastretrans_alert(sk, prior_snd_una, prior_packets, flag); } else { - if ((flag & FLAG_DATA_ACKED)) + if ((flag & FLAG_DATA_ACKED) && !frto_cwnd) tcp_cong_avoid(sk, ack, seq_rtt, prior_in_flight, 1); } @@ -2599,7 +2829,7 @@ no_queue: * being used to time the probes, and is probably far higher than * it needs to be for normal retransmission. */ - if (sk->sk_send_head) + if (tcp_send_head(sk)) tcp_ack_probe(sk); return 1; @@ -2620,13 +2850,13 @@ uninteresting_ack: void tcp_parse_options(struct sk_buff *skb, struct tcp_options_received *opt_rx, int estab) { unsigned char *ptr; - struct tcphdr *th = skb->h.th; + struct tcphdr *th = tcp_hdr(skb); int length=(th->doff*4)-sizeof(struct tcphdr); ptr = (unsigned char *)(th + 1); opt_rx->saw_tstamp = 0; - while(length>0) { + while (length > 0) { int opcode=*ptr++; int opsize; @@ -2642,9 +2872,9 @@ void tcp_parse_options(struct sk_buff *skb, struct tcp_options_received *opt_rx, return; if (opsize > length) return; /* don't parse partial options */ - switch(opcode) { + switch (opcode) { case TCPOPT_MSS: - if(opsize==TCPOLEN_MSS && th->syn && !estab) { + if (opsize==TCPOLEN_MSS && th->syn && !estab) { u16 in_mss = ntohs(get_unaligned((__be16 *)ptr)); if (in_mss) { if (opt_rx->user_mss && opt_rx->user_mss < in_mss) @@ -2654,12 +2884,12 @@ void tcp_parse_options(struct sk_buff *skb, struct tcp_options_received *opt_rx, } break; case TCPOPT_WINDOW: - if(opsize==TCPOLEN_WINDOW && th->syn && !estab) + if (opsize==TCPOLEN_WINDOW && th->syn && !estab) if (sysctl_tcp_window_scaling) { __u8 snd_wscale = *(__u8 *) ptr; opt_rx->wscale_ok = 1; if (snd_wscale > 14) { - if(net_ratelimit()) + if (net_ratelimit()) printk(KERN_INFO "tcp_parse_options: Illegal window " "scaling value %d >14 received.\n", snd_wscale); @@ -2669,7 +2899,7 @@ void tcp_parse_options(struct sk_buff *skb, struct tcp_options_received *opt_rx, } break; case TCPOPT_TIMESTAMP: - if(opsize==TCPOLEN_TIMESTAMP) { + if (opsize==TCPOLEN_TIMESTAMP) { if ((estab && opt_rx->tstamp_ok) || (!estab && sysctl_tcp_timestamps)) { opt_rx->saw_tstamp = 1; @@ -2679,7 +2909,7 @@ void tcp_parse_options(struct sk_buff *skb, struct tcp_options_received *opt_rx, } break; case TCPOPT_SACK_PERM: - if(opsize==TCPOLEN_SACK_PERM && th->syn && !estab) { + if (opsize==TCPOLEN_SACK_PERM && th->syn && !estab) { if (sysctl_tcp_sack) { opt_rx->sack_ok = 1; tcp_sack_reset(opt_rx); @@ -2688,7 +2918,7 @@ void tcp_parse_options(struct sk_buff *skb, struct tcp_options_received *opt_rx, break; case TCPOPT_SACK: - if((opsize >= (TCPOLEN_SACK_BASE + TCPOLEN_SACK_PERBLOCK)) && + if ((opsize >= (TCPOLEN_SACK_BASE + TCPOLEN_SACK_PERBLOCK)) && !((opsize - TCPOLEN_SACK_BASE) % TCPOLEN_SACK_PERBLOCK) && opt_rx->sack_ok) { TCP_SKB_CB(skb)->sacked = (ptr - 2) - (unsigned char *)th; @@ -2701,10 +2931,11 @@ void tcp_parse_options(struct sk_buff *skb, struct tcp_options_received *opt_rx, */ break; #endif - }; + } + ptr+=opsize-2; length-=opsize; - }; + } } } @@ -2737,7 +2968,7 @@ static int tcp_fast_parse_options(struct sk_buff *skb, struct tcphdr *th, static inline void tcp_store_ts_recent(struct tcp_sock *tp) { tp->rx_opt.ts_recent = tp->rx_opt.rcv_tsval; - tp->rx_opt.ts_recent_stamp = xtime.tv_sec; + tp->rx_opt.ts_recent_stamp = get_seconds(); } static inline void tcp_replace_ts_recent(struct tcp_sock *tp, u32 seq) @@ -2750,8 +2981,8 @@ static inline void tcp_replace_ts_recent(struct tcp_sock *tp, u32 seq) * Not only, also it occurs for expired timestamps. */ - if((s32)(tp->rx_opt.rcv_tsval - tp->rx_opt.ts_recent) >= 0 || - xtime.tv_sec >= tp->rx_opt.ts_recent_stamp + TCP_PAWS_24DAYS) + if ((s32)(tp->rx_opt.rcv_tsval - tp->rx_opt.ts_recent) >= 0 || + get_seconds() >= tp->rx_opt.ts_recent_stamp + TCP_PAWS_24DAYS) tcp_store_ts_recent(tp); } } @@ -2782,7 +3013,7 @@ static inline void tcp_replace_ts_recent(struct tcp_sock *tp, u32 seq) static int tcp_disordered_ack(const struct sock *sk, const struct sk_buff *skb) { struct tcp_sock *tp = tcp_sk(sk); - struct tcphdr *th = skb->h.th; + struct tcphdr *th = tcp_hdr(skb); u32 seq = TCP_SKB_CB(skb)->seq; u32 ack = TCP_SKB_CB(skb)->ack_seq; @@ -2803,7 +3034,7 @@ static inline int tcp_paws_discard(const struct sock *sk, const struct sk_buff * { const struct tcp_sock *tp = tcp_sk(sk); return ((s32)(tp->rx_opt.ts_recent - tp->rx_opt.rcv_tsval) > TCP_PAWS_WINDOW && - xtime.tv_sec < tp->rx_opt.ts_recent_stamp + TCP_PAWS_24DAYS && + get_seconds() < tp->rx_opt.ts_recent_stamp + TCP_PAWS_24DAYS && !tcp_disordered_ack(sk, skb)); } @@ -2910,7 +3141,7 @@ static void tcp_fin(struct sk_buff *skb, struct sock *sk, struct tcphdr *th) printk(KERN_ERR "%s: Impossible, sk->sk_state=%d\n", __FUNCTION__, sk->sk_state); break; - }; + } /* It _is_ possible, that we have something out-of-order _after_ FIN. * Probably, we should reset in this case. For now drop them. @@ -3009,7 +3240,7 @@ static void tcp_sack_maybe_coalesce(struct tcp_sock *tp) */ tp->rx_opt.num_sacks--; tp->rx_opt.eff_sacks = min(tp->rx_opt.num_sacks + tp->rx_opt.dsack, 4 - tp->rx_opt.tstamp_ok); - for(i=this_sack; i < tp->rx_opt.num_sacks; i++) + for (i=this_sack; i < tp->rx_opt.num_sacks; i++) sp[i] = sp[i+1]; continue; } @@ -3062,7 +3293,7 @@ static void tcp_sack_new_ofo_skb(struct sock *sk, u32 seq, u32 end_seq) tp->rx_opt.num_sacks--; sp--; } - for(; this_sack > 0; this_sack--, sp--) + for (; this_sack > 0; this_sack--, sp--) *sp = *(sp-1); new_sack: @@ -3088,7 +3319,7 @@ static void tcp_sack_remove(struct tcp_sock *tp) return; } - for(this_sack = 0; this_sack < num_sacks; ) { + for (this_sack = 0; this_sack < num_sacks; ) { /* Check if the start of the sack is covered by RCV.NXT. */ if (!before(tp->rcv_nxt, sp->start_seq)) { int i; @@ -3144,8 +3375,8 @@ static void tcp_ofo_queue(struct sock *sk) __skb_unlink(skb, &tp->out_of_order_queue); __skb_queue_tail(&sk->sk_receive_queue, skb); tp->rcv_nxt = TCP_SKB_CB(skb)->end_seq; - if(skb->h.th->fin) - tcp_fin(skb, sk, skb->h.th); + if (tcp_hdr(skb)->fin) + tcp_fin(skb, sk, tcp_hdr(skb)); } } @@ -3153,7 +3384,7 @@ static int tcp_prune_queue(struct sock *sk); static void tcp_data_queue(struct sock *sk, struct sk_buff *skb) { - struct tcphdr *th = skb->h.th; + struct tcphdr *th = tcp_hdr(skb); struct tcp_sock *tp = tcp_sk(sk); int eaten = -1; @@ -3210,9 +3441,9 @@ queue_and_out: __skb_queue_tail(&sk->sk_receive_queue, skb); } tp->rcv_nxt = TCP_SKB_CB(skb)->end_seq; - if(skb->len) - tcp_event_data_recv(sk, tp, skb); - if(th->fin) + if (skb->len) + tcp_event_data_recv(sk, skb); + if (th->fin) tcp_fin(skb, sk, th); if (!skb_queue_empty(&tp->out_of_order_queue)) { @@ -3228,7 +3459,7 @@ queue_and_out: if (tp->rx_opt.num_sacks) tcp_sack_remove(tp); - tcp_fast_path_check(sk, tp); + tcp_fast_path_check(sk); if (eaten > 0) __kfree_skb(skb); @@ -3392,7 +3623,7 @@ tcp_collapse(struct sock *sk, struct sk_buff_head *list, * - bloated or contains data before "start" or * overlaps to the next one. */ - if (!skb->h.th->syn && !skb->h.th->fin && + if (!tcp_hdr(skb)->syn && !tcp_hdr(skb)->fin && (tcp_win_from_space(skb->truesize) > skb->len || before(TCP_SKB_CB(skb)->seq, start) || (skb->next != tail && @@ -3403,7 +3634,7 @@ tcp_collapse(struct sock *sk, struct sk_buff_head *list, start = TCP_SKB_CB(skb)->end_seq; skb = skb->next; } - if (skb == tail || skb->h.th->syn || skb->h.th->fin) + if (skb == tail || tcp_hdr(skb)->syn || tcp_hdr(skb)->fin) return; while (before(start, end)) { @@ -3419,11 +3650,14 @@ tcp_collapse(struct sock *sk, struct sk_buff_head *list, nskb = alloc_skb(copy+header, GFP_ATOMIC); if (!nskb) return; + + skb_set_mac_header(nskb, skb_mac_header(skb) - skb->head); + skb_set_network_header(nskb, (skb_network_header(skb) - + skb->head)); + skb_set_transport_header(nskb, (skb_transport_header(skb) - + skb->head)); skb_reserve(nskb, header); memcpy(nskb->head, skb->head, header); - nskb->nh.raw = nskb->head + (skb->nh.raw-skb->head); - nskb->h.raw = nskb->head + (skb->h.raw-skb->head); - nskb->mac.raw = nskb->head + (skb->mac.raw-skb->head); memcpy(nskb->cb, skb->cb, sizeof(skb->cb)); TCP_SKB_CB(nskb)->seq = TCP_SKB_CB(nskb)->end_seq = start; __skb_insert(nskb, skb->prev, skb, list); @@ -3449,7 +3683,9 @@ tcp_collapse(struct sock *sk, struct sk_buff_head *list, __kfree_skb(skb); NET_INC_STATS_BH(LINUX_MIB_TCPRCVCOLLAPSED); skb = next; - if (skb == tail || skb->h.th->syn || skb->h.th->fin) + if (skb == tail || + tcp_hdr(skb)->syn || + tcp_hdr(skb)->fin) return; } } @@ -3514,7 +3750,7 @@ static int tcp_prune_queue(struct sock *sk) NET_INC_STATS_BH(LINUX_MIB_PRUNECALLED); if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) - tcp_clamp_window(sk, tp); + tcp_clamp_window(sk); else if (tcp_memory_pressure) tp->rcv_ssthresh = min(tp->rcv_ssthresh, 4U * tp->advmss); @@ -3583,8 +3819,10 @@ void tcp_cwnd_application_limited(struct sock *sk) tp->snd_cwnd_stamp = tcp_time_stamp; } -static int tcp_should_expand_sndbuf(struct sock *sk, struct tcp_sock *tp) +static int tcp_should_expand_sndbuf(struct sock *sk) { + struct tcp_sock *tp = tcp_sk(sk); + /* If the user specified a specific send buffer setting, do * not modify it. */ @@ -3616,7 +3854,7 @@ static void tcp_new_space(struct sock *sk) { struct tcp_sock *tp = tcp_sk(sk); - if (tcp_should_expand_sndbuf(sk, tp)) { + if (tcp_should_expand_sndbuf(sk)) { int sndmem = max_t(u32, tp->rx_opt.mss_clamp, tp->mss_cache) + MAX_TCP_HEADER + 16 + sizeof(struct sk_buff), demanded = max_t(unsigned int, tp->snd_cwnd, @@ -3640,9 +3878,9 @@ static void tcp_check_space(struct sock *sk) } } -static inline void tcp_data_snd_check(struct sock *sk, struct tcp_sock *tp) +static inline void tcp_data_snd_check(struct sock *sk) { - tcp_push_pending_frames(sk, tp); + tcp_push_pending_frames(sk); tcp_check_space(sk); } @@ -3790,7 +4028,7 @@ static int tcp_copy_to_iovec(struct sock *sk, struct sk_buff *skb, int hlen) int err; local_bh_enable(); - if (skb->ip_summed==CHECKSUM_UNNECESSARY) + if (skb_csum_unnecessary(skb)) err = skb_copy_datagram_iovec(skb, hlen, tp->ucopy.iov, chunk); else err = skb_copy_and_csum_datagram_iovec(skb, hlen, @@ -3822,7 +4060,7 @@ static __sum16 __tcp_checksum_complete_user(struct sock *sk, struct sk_buff *skb static inline int tcp_checksum_complete_user(struct sock *sk, struct sk_buff *skb) { - return skb->ip_summed != CHECKSUM_UNNECESSARY && + return !skb_csum_unnecessary(skb) && __tcp_checksum_complete_user(sk, skb); } @@ -3840,7 +4078,7 @@ static int tcp_dma_try_early_copy(struct sock *sk, struct sk_buff *skb, int hlen if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) tp->ucopy.dma_chan = get_softnet_dma(); - if (tp->ucopy.dma_chan && skb->ip_summed == CHECKSUM_UNNECESSARY) { + if (tp->ucopy.dma_chan && skb_csum_unnecessary(skb)) { dma_cookie = dma_skb_copy_datagram_iovec(tp->ucopy.dma_chan, skb, hlen, tp->ucopy.iov, chunk, tp->ucopy.pinned_list); @@ -3856,7 +4094,7 @@ static int tcp_dma_try_early_copy(struct sock *sk, struct sk_buff *skb, int hlen tcp_rcv_space_adjust(sk); if ((tp->ucopy.len == 0) || - (tcp_flag_word(skb->h.th) & TCP_FLAG_PSH) || + (tcp_flag_word(tcp_hdr(skb)) & TCP_FLAG_PSH) || (atomic_read(&sk->sk_rmem_alloc) > (sk->sk_rcvbuf >> 1))) { tp->ucopy.wakeup = 1; sk->sk_data_ready(sk, 0); @@ -3976,7 +4214,7 @@ int tcp_rcv_established(struct sock *sk, struct sk_buff *skb, */ tcp_ack(sk, skb, 0); __kfree_skb(skb); - tcp_data_snd_check(sk, tp); + tcp_data_snd_check(sk); return 0; } else { /* Header too small */ TCP_INC_STATS_BH(TCP_MIB_INERRS); @@ -4047,12 +4285,12 @@ int tcp_rcv_established(struct sock *sk, struct sk_buff *skb, tp->rcv_nxt = TCP_SKB_CB(skb)->end_seq; } - tcp_event_data_recv(sk, tp, skb); + tcp_event_data_recv(sk, 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_data_snd_check(sk, tp); + tcp_data_snd_check(sk); if (!inet_csk_ack_scheduled(sk)) goto no_ack; } @@ -4109,7 +4347,7 @@ slow_path: goto discard; } - if(th->rst) { + if (th->rst) { tcp_reset(sk); goto discard; } @@ -4124,7 +4362,7 @@ slow_path: } step5: - if(th->ack) + if (th->ack) tcp_ack(sk, skb, FLAG_SLOWPATH); tcp_rcv_rtt_measure_ts(sk, skb); @@ -4135,7 +4373,7 @@ step5: /* step 7: process the segment text */ tcp_data_queue(sk, skb); - tcp_data_snd_check(sk, tp); + tcp_data_snd_check(sk); tcp_ack_snd_check(sk); return 0; @@ -4412,13 +4650,13 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb, goto discard; case TCP_LISTEN: - if(th->ack) + if (th->ack) return 1; - if(th->rst) + if (th->rst) goto discard; - if(th->syn) { + if (th->syn) { if (icsk->icsk_af_ops->conn_request(sk, skb) < 0) return 1; @@ -4452,7 +4690,7 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb, /* Do step6 onward by hand. */ tcp_urg(sk, skb, th); __kfree_skb(skb); - tcp_data_snd_check(sk, tp); + tcp_data_snd_check(sk); return 0; } @@ -4474,7 +4712,7 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb, } /* step 2: check RST bit */ - if(th->rst) { + if (th->rst) { tcp_reset(sk); goto discard; } @@ -4497,7 +4735,7 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb, if (th->ack) { int acceptable = tcp_ack(sk, skb, FLAG_SLOWPATH); - switch(sk->sk_state) { + switch (sk->sk_state) { case TCP_SYN_RECV: if (acceptable) { tp->copied_seq = tp->rcv_nxt; @@ -4644,7 +4882,7 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb, /* tcp_data could move socket to TIME-WAIT */ if (sk->sk_state != TCP_CLOSE) { - tcp_data_snd_check(sk, tp); + tcp_data_snd_check(sk); tcp_ack_snd_check(sk); } |