diff options
author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2011-11-02 23:56:40 -0400 |
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committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2011-11-02 23:56:40 -0400 |
commit | 31cbecb4ab538f433145bc5a46f3bea9b9627031 (patch) | |
tree | d6206d42dea7298f7ef05fd1f7bf474245f0d43a /net/ipv4/tcp_input.c | |
parent | 2b72c9ccd22c4a3299e5a358dcd639fb253730f4 (diff) | |
parent | 278c023a99b0d6b471d0f4a79835c703482e29ac (diff) | |
download | linux-stable-31cbecb4ab538f433145bc5a46f3bea9b9627031.tar.gz linux-stable-31cbecb4ab538f433145bc5a46f3bea9b9627031.tar.bz2 linux-stable-31cbecb4ab538f433145bc5a46f3bea9b9627031.zip |
Merge branch 'osd-devel' into nfs-for-next
Diffstat (limited to 'net/ipv4/tcp_input.c')
-rw-r--r-- | net/ipv4/tcp_input.c | 244 |
1 files changed, 153 insertions, 91 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index d73aab3fbfc0..52b5c2d0ecd0 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -206,7 +206,7 @@ static inline void TCP_ECN_queue_cwr(struct tcp_sock *tp) tp->ecn_flags |= TCP_ECN_QUEUE_CWR; } -static inline void TCP_ECN_accept_cwr(struct tcp_sock *tp, struct sk_buff *skb) +static inline void TCP_ECN_accept_cwr(struct tcp_sock *tp, const struct sk_buff *skb) { if (tcp_hdr(skb)->cwr) tp->ecn_flags &= ~TCP_ECN_DEMAND_CWR; @@ -217,32 +217,41 @@ static inline void TCP_ECN_withdraw_cwr(struct tcp_sock *tp) tp->ecn_flags &= ~TCP_ECN_DEMAND_CWR; } -static inline void TCP_ECN_check_ce(struct tcp_sock *tp, struct sk_buff *skb) +static inline void TCP_ECN_check_ce(struct tcp_sock *tp, const struct sk_buff *skb) { - if (tp->ecn_flags & TCP_ECN_OK) { - if (INET_ECN_is_ce(TCP_SKB_CB(skb)->flags)) - tp->ecn_flags |= TCP_ECN_DEMAND_CWR; + if (!(tp->ecn_flags & TCP_ECN_OK)) + return; + + switch (TCP_SKB_CB(skb)->ip_dsfield & INET_ECN_MASK) { + case INET_ECN_NOT_ECT: /* Funny extension: if ECT is not set on a segment, - * it is surely retransmit. It is not in ECN RFC, - * but Linux follows this rule. */ - else if (INET_ECN_is_not_ect((TCP_SKB_CB(skb)->flags))) + * and we already seen ECT on a previous segment, + * it is probably a retransmit. + */ + if (tp->ecn_flags & TCP_ECN_SEEN) tcp_enter_quickack_mode((struct sock *)tp); + break; + case INET_ECN_CE: + tp->ecn_flags |= TCP_ECN_DEMAND_CWR; + /* fallinto */ + default: + tp->ecn_flags |= TCP_ECN_SEEN; } } -static inline void TCP_ECN_rcv_synack(struct tcp_sock *tp, struct tcphdr *th) +static inline void TCP_ECN_rcv_synack(struct tcp_sock *tp, const struct tcphdr *th) { if ((tp->ecn_flags & TCP_ECN_OK) && (!th->ece || th->cwr)) tp->ecn_flags &= ~TCP_ECN_OK; } -static inline void TCP_ECN_rcv_syn(struct tcp_sock *tp, struct tcphdr *th) +static inline void TCP_ECN_rcv_syn(struct tcp_sock *tp, const struct tcphdr *th) { if ((tp->ecn_flags & TCP_ECN_OK) && (!th->ece || !th->cwr)) tp->ecn_flags &= ~TCP_ECN_OK; } -static inline int TCP_ECN_rcv_ecn_echo(struct tcp_sock *tp, struct tcphdr *th) +static inline int TCP_ECN_rcv_ecn_echo(const struct tcp_sock *tp, const struct tcphdr *th) { if (th->ece && !th->syn && (tp->ecn_flags & TCP_ECN_OK)) return 1; @@ -256,14 +265,11 @@ static inline int TCP_ECN_rcv_ecn_echo(struct tcp_sock *tp, struct tcphdr *th) static void tcp_fixup_sndbuf(struct sock *sk) { - int sndmem = tcp_sk(sk)->rx_opt.mss_clamp + MAX_TCP_HEADER + 16 + - sizeof(struct sk_buff); + int sndmem = SKB_TRUESIZE(tcp_sk(sk)->rx_opt.mss_clamp + MAX_TCP_HEADER); - if (sk->sk_sndbuf < 3 * sndmem) { - sk->sk_sndbuf = 3 * sndmem; - if (sk->sk_sndbuf > sysctl_tcp_wmem[2]) - sk->sk_sndbuf = sysctl_tcp_wmem[2]; - } + sndmem *= TCP_INIT_CWND; + if (sk->sk_sndbuf < sndmem) + sk->sk_sndbuf = min(sndmem, sysctl_tcp_wmem[2]); } /* 2. Tuning advertised window (window_clamp, rcv_ssthresh) @@ -309,7 +315,7 @@ static int __tcp_grow_window(const struct sock *sk, const struct sk_buff *skb) return 0; } -static void tcp_grow_window(struct sock *sk, struct sk_buff *skb) +static void tcp_grow_window(struct sock *sk, const struct sk_buff *skb) { struct tcp_sock *tp = tcp_sk(sk); @@ -339,17 +345,24 @@ static void tcp_grow_window(struct sock *sk, struct sk_buff *skb) static void tcp_fixup_rcvbuf(struct sock *sk) { - struct tcp_sock *tp = tcp_sk(sk); - int rcvmem = tp->advmss + MAX_TCP_HEADER + 16 + sizeof(struct sk_buff); + u32 mss = tcp_sk(sk)->advmss; + u32 icwnd = TCP_DEFAULT_INIT_RCVWND; + int rcvmem; - /* Try to select rcvbuf so that 4 mss-sized segments - * will fit to window and corresponding skbs will fit to our rcvbuf. - * (was 3; 4 is minimum to allow fast retransmit to work.) + /* Limit to 10 segments if mss <= 1460, + * or 14600/mss segments, with a minimum of two segments. */ - while (tcp_win_from_space(rcvmem) < tp->advmss) + if (mss > 1460) + icwnd = max_t(u32, (1460 * TCP_DEFAULT_INIT_RCVWND) / mss, 2); + + rcvmem = SKB_TRUESIZE(mss + MAX_TCP_HEADER); + while (tcp_win_from_space(rcvmem) < mss) rcvmem += 128; - if (sk->sk_rcvbuf < 4 * rcvmem) - sk->sk_rcvbuf = min(4 * rcvmem, sysctl_tcp_rmem[2]); + + rcvmem *= icwnd; + + if (sk->sk_rcvbuf < rcvmem) + sk->sk_rcvbuf = min(rcvmem, sysctl_tcp_rmem[2]); } /* 4. Try to fixup all. It is made immediately after connection enters @@ -416,7 +429,7 @@ static void tcp_clamp_window(struct sock *sk) */ void tcp_initialize_rcv_mss(struct sock *sk) { - struct tcp_sock *tp = tcp_sk(sk); + const struct tcp_sock *tp = tcp_sk(sk); unsigned int hint = min_t(unsigned int, tp->advmss, tp->mss_cache); hint = min(hint, tp->rcv_wnd / 2); @@ -531,8 +544,7 @@ void tcp_rcv_space_adjust(struct sock *sk) space /= tp->advmss; if (!space) space = 1; - rcvmem = (tp->advmss + MAX_TCP_HEADER + - 16 + sizeof(struct sk_buff)); + rcvmem = SKB_TRUESIZE(tp->advmss + MAX_TCP_HEADER); while (tcp_win_from_space(rcvmem) < tp->advmss) rcvmem += 128; space *= rcvmem; @@ -812,7 +824,7 @@ void tcp_update_metrics(struct sock *sk) } } -__u32 tcp_init_cwnd(struct tcp_sock *tp, struct dst_entry *dst) +__u32 tcp_init_cwnd(const struct tcp_sock *tp, const struct dst_entry *dst) { __u32 cwnd = (dst ? dst_metric(dst, RTAX_INITCWND) : 0); @@ -1204,7 +1216,7 @@ static void tcp_mark_lost_retrans(struct sock *sk) tp->lost_retrans_low = new_low_seq; } -static int tcp_check_dsack(struct sock *sk, struct sk_buff *ack_skb, +static int tcp_check_dsack(struct sock *sk, const struct sk_buff *ack_skb, struct tcp_sack_block_wire *sp, int num_sacks, u32 prior_snd_una) { @@ -1298,7 +1310,7 @@ static int tcp_match_skb_to_sack(struct sock *sk, struct sk_buff *skb, return in_sack; } -static u8 tcp_sacktag_one(struct sk_buff *skb, struct sock *sk, +static u8 tcp_sacktag_one(const struct sk_buff *skb, struct sock *sk, struct tcp_sacktag_state *state, int dup_sack, int pcount) { @@ -1438,7 +1450,7 @@ static int tcp_shifted_skb(struct sock *sk, struct sk_buff *skb, tp->lost_cnt_hint -= tcp_skb_pcount(prev); } - TCP_SKB_CB(skb)->flags |= TCP_SKB_CB(prev)->flags; + TCP_SKB_CB(skb)->tcp_flags |= TCP_SKB_CB(prev)->tcp_flags; if (skb == tcp_highest_sack(sk)) tcp_advance_highest_sack(sk, skb); @@ -1453,13 +1465,13 @@ static int tcp_shifted_skb(struct sock *sk, struct sk_buff *skb, /* I wish gso_size would have a bit more sane initialization than * something-or-zero which complicates things */ -static int tcp_skb_seglen(struct sk_buff *skb) +static int tcp_skb_seglen(const struct sk_buff *skb) { return tcp_skb_pcount(skb) == 1 ? skb->len : tcp_skb_mss(skb); } /* Shifting pages past head area doesn't work */ -static int skb_can_shift(struct sk_buff *skb) +static int skb_can_shift(const struct sk_buff *skb) { return !skb_headlen(skb) && skb_is_nonlinear(skb); } @@ -1708,19 +1720,19 @@ static struct sk_buff *tcp_maybe_skipping_dsack(struct sk_buff *skb, return skb; } -static int tcp_sack_cache_ok(struct tcp_sock *tp, struct tcp_sack_block *cache) +static int tcp_sack_cache_ok(const struct tcp_sock *tp, const struct tcp_sack_block *cache) { return cache < tp->recv_sack_cache + ARRAY_SIZE(tp->recv_sack_cache); } static int -tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, +tcp_sacktag_write_queue(struct sock *sk, const struct sk_buff *ack_skb, u32 prior_snd_una) { const struct inet_connection_sock *icsk = inet_csk(sk); struct tcp_sock *tp = tcp_sk(sk); - unsigned char *ptr = (skb_transport_header(ack_skb) + - TCP_SKB_CB(ack_skb)->sacked); + const unsigned char *ptr = (skb_transport_header(ack_skb) + + TCP_SKB_CB(ack_skb)->sacked); struct tcp_sack_block_wire *sp_wire = (struct tcp_sack_block_wire *)(ptr+2); struct tcp_sack_block sp[TCP_NUM_SACKS]; struct tcp_sack_block *cache; @@ -2284,7 +2296,7 @@ static int tcp_check_sack_reneging(struct sock *sk, int flag) return 0; } -static inline int tcp_fackets_out(struct tcp_sock *tp) +static inline int tcp_fackets_out(const struct tcp_sock *tp) { return tcp_is_reno(tp) ? tp->sacked_out + 1 : tp->fackets_out; } @@ -2304,19 +2316,20 @@ static inline int tcp_fackets_out(struct tcp_sock *tp) * they differ. Since neither occurs due to loss, TCP should really * ignore them. */ -static inline int tcp_dupack_heuristics(struct tcp_sock *tp) +static inline int tcp_dupack_heuristics(const struct tcp_sock *tp) { return tcp_is_fack(tp) ? tp->fackets_out : tp->sacked_out + 1; } -static inline int tcp_skb_timedout(struct sock *sk, struct sk_buff *skb) +static inline int tcp_skb_timedout(const struct sock *sk, + const 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) +static inline int tcp_head_timedout(const struct sock *sk) { - struct tcp_sock *tp = tcp_sk(sk); + const struct tcp_sock *tp = tcp_sk(sk); return tp->packets_out && tcp_skb_timedout(sk, tcp_write_queue_head(sk)); @@ -2627,7 +2640,7 @@ static void tcp_cwnd_down(struct sock *sk, int flag) /* Nothing was retransmitted or returned timestamp is less * than timestamp of the first retransmission. */ -static inline int tcp_packet_delayed(struct tcp_sock *tp) +static inline int tcp_packet_delayed(const struct tcp_sock *tp) { return !tp->retrans_stamp || (tp->rx_opt.saw_tstamp && tp->rx_opt.rcv_tsecr && @@ -2688,7 +2701,7 @@ static void tcp_undo_cwr(struct sock *sk, const bool undo_ssthresh) tp->snd_cwnd_stamp = tcp_time_stamp; } -static inline int tcp_may_undo(struct tcp_sock *tp) +static inline int tcp_may_undo(const struct tcp_sock *tp) { return tp->undo_marker && (!tp->undo_retrans || tcp_packet_delayed(tp)); } @@ -2752,9 +2765,9 @@ static void tcp_try_undo_dsack(struct sock *sk) * that successive retransmissions of a segment must not advance * retrans_stamp under any conditions. */ -static int tcp_any_retrans_done(struct sock *sk) +static int tcp_any_retrans_done(const struct sock *sk) { - struct tcp_sock *tp = tcp_sk(sk); + const struct tcp_sock *tp = tcp_sk(sk); struct sk_buff *skb; if (tp->retrans_out) @@ -2828,9 +2841,13 @@ static int tcp_try_undo_loss(struct sock *sk) static inline void tcp_complete_cwr(struct sock *sk) { struct tcp_sock *tp = tcp_sk(sk); - /* Do not moderate cwnd if it's already undone in cwr or recovery */ - if (tp->undo_marker && tp->snd_cwnd > tp->snd_ssthresh) { - tp->snd_cwnd = tp->snd_ssthresh; + + /* Do not moderate cwnd if it's already undone in cwr or recovery. */ + if (tp->undo_marker) { + if (inet_csk(sk)->icsk_ca_state == TCP_CA_CWR) + tp->snd_cwnd = min(tp->snd_cwnd, tp->snd_ssthresh); + else /* PRR */ + tp->snd_cwnd = tp->snd_ssthresh; tp->snd_cwnd_stamp = tcp_time_stamp; } tcp_ca_event(sk, CA_EVENT_COMPLETE_CWR); @@ -2948,6 +2965,38 @@ void tcp_simple_retransmit(struct sock *sk) } EXPORT_SYMBOL(tcp_simple_retransmit); +/* This function implements the PRR algorithm, specifcally the PRR-SSRB + * (proportional rate reduction with slow start reduction bound) as described in + * http://www.ietf.org/id/draft-mathis-tcpm-proportional-rate-reduction-01.txt. + * It computes the number of packets to send (sndcnt) based on packets newly + * delivered: + * 1) If the packets in flight is larger than ssthresh, PRR spreads the + * cwnd reductions across a full RTT. + * 2) If packets in flight is lower than ssthresh (such as due to excess + * losses and/or application stalls), do not perform any further cwnd + * reductions, but instead slow start up to ssthresh. + */ +static void tcp_update_cwnd_in_recovery(struct sock *sk, int newly_acked_sacked, + int fast_rexmit, int flag) +{ + struct tcp_sock *tp = tcp_sk(sk); + int sndcnt = 0; + int delta = tp->snd_ssthresh - tcp_packets_in_flight(tp); + + if (tcp_packets_in_flight(tp) > tp->snd_ssthresh) { + u64 dividend = (u64)tp->snd_ssthresh * tp->prr_delivered + + tp->prior_cwnd - 1; + sndcnt = div_u64(dividend, tp->prior_cwnd) - tp->prr_out; + } else { + sndcnt = min_t(int, delta, + max_t(int, tp->prr_delivered - tp->prr_out, + newly_acked_sacked) + 1); + } + + sndcnt = max(sndcnt, (fast_rexmit ? 1 : 0)); + tp->snd_cwnd = tcp_packets_in_flight(tp) + sndcnt; +} + /* Process an event, which can update packets-in-flight not trivially. * Main goal of this function is to calculate new estimate for left_out, * taking into account both packets sitting in receiver's buffer and @@ -2959,7 +3008,8 @@ EXPORT_SYMBOL(tcp_simple_retransmit); * It does _not_ decide what to send, it is made in function * tcp_xmit_retransmit_queue(). */ -static void tcp_fastretrans_alert(struct sock *sk, int pkts_acked, int flag) +static void tcp_fastretrans_alert(struct sock *sk, int pkts_acked, + int newly_acked_sacked, int flag) { struct inet_connection_sock *icsk = inet_csk(sk); struct tcp_sock *tp = tcp_sk(sk); @@ -3109,13 +3159,17 @@ static void tcp_fastretrans_alert(struct sock *sk, int pkts_acked, int flag) tp->bytes_acked = 0; tp->snd_cwnd_cnt = 0; + tp->prior_cwnd = tp->snd_cwnd; + tp->prr_delivered = 0; + tp->prr_out = 0; tcp_set_ca_state(sk, TCP_CA_Recovery); fast_rexmit = 1; } if (do_lost || (tcp_is_fack(tp) && tcp_head_timedout(sk))) tcp_update_scoreboard(sk, fast_rexmit); - tcp_cwnd_down(sk, flag); + tp->prr_delivered += newly_acked_sacked; + tcp_update_cwnd_in_recovery(sk, newly_acked_sacked, fast_rexmit, flag); tcp_xmit_retransmit_queue(sk); } @@ -3192,7 +3246,7 @@ static void tcp_cong_avoid(struct sock *sk, u32 ack, u32 in_flight) */ static void tcp_rearm_rto(struct sock *sk) { - struct tcp_sock *tp = tcp_sk(sk); + const struct tcp_sock *tp = tcp_sk(sk); if (!tp->packets_out) { inet_csk_clear_xmit_timer(sk, ICSK_TIME_RETRANS); @@ -3296,7 +3350,7 @@ static int tcp_clean_rtx_queue(struct sock *sk, int prior_fackets, * connection startup slow start one packet too * quickly. This is severely frowned upon behavior. */ - if (!(scb->flags & TCPHDR_SYN)) { + if (!(scb->tcp_flags & TCPHDR_SYN)) { flag |= FLAG_DATA_ACKED; } else { flag |= FLAG_SYN_ACKED; @@ -3444,7 +3498,7 @@ static inline int tcp_may_update_window(const struct tcp_sock *tp, * 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 sk_buff *skb, u32 ack, +static int tcp_ack_update_window(struct sock *sk, const struct sk_buff *skb, u32 ack, u32 ack_seq) { struct tcp_sock *tp = tcp_sk(sk); @@ -3620,7 +3674,7 @@ static int tcp_process_frto(struct sock *sk, int flag) } /* This routine deals with incoming acks, but not outgoing ones. */ -static int tcp_ack(struct sock *sk, struct sk_buff *skb, int flag) +static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag) { struct inet_connection_sock *icsk = inet_csk(sk); struct tcp_sock *tp = tcp_sk(sk); @@ -3630,6 +3684,8 @@ static int tcp_ack(struct sock *sk, struct sk_buff *skb, int flag) u32 prior_in_flight; u32 prior_fackets; int prior_packets; + int prior_sacked = tp->sacked_out; + int newly_acked_sacked = 0; int frto_cwnd = 0; /* If the ack is older than previous acks @@ -3701,6 +3757,9 @@ static int tcp_ack(struct sock *sk, struct sk_buff *skb, int flag) /* See if we can take anything off of the retransmit queue. */ flag |= tcp_clean_rtx_queue(sk, prior_fackets, prior_snd_una); + newly_acked_sacked = (prior_packets - prior_sacked) - + (tp->packets_out - tp->sacked_out); + if (tp->frto_counter) frto_cwnd = tcp_process_frto(sk, flag); /* Guarantee sacktag reordering detection against wrap-arounds */ @@ -3713,7 +3772,7 @@ static int tcp_ack(struct sock *sk, struct sk_buff *skb, int flag) tcp_may_raise_cwnd(sk, flag)) tcp_cong_avoid(sk, ack, prior_in_flight); tcp_fastretrans_alert(sk, prior_packets - tp->packets_out, - flag); + newly_acked_sacked, flag); } else { if ((flag & FLAG_DATA_ACKED) && !frto_cwnd) tcp_cong_avoid(sk, ack, prior_in_flight); @@ -3752,14 +3811,14 @@ old_ack: * But, this can also be called on packets in the established flow when * the fast version below fails. */ -void tcp_parse_options(struct sk_buff *skb, struct tcp_options_received *opt_rx, - u8 **hvpp, int estab) +void tcp_parse_options(const struct sk_buff *skb, struct tcp_options_received *opt_rx, + const u8 **hvpp, int estab) { - unsigned char *ptr; - struct tcphdr *th = tcp_hdr(skb); + const unsigned char *ptr; + const struct tcphdr *th = tcp_hdr(skb); int length = (th->doff * 4) - sizeof(struct tcphdr); - ptr = (unsigned char *)(th + 1); + ptr = (const unsigned char *)(th + 1); opt_rx->saw_tstamp = 0; while (length > 0) { @@ -3870,9 +3929,9 @@ void tcp_parse_options(struct sk_buff *skb, struct tcp_options_received *opt_rx, } EXPORT_SYMBOL(tcp_parse_options); -static int tcp_parse_aligned_timestamp(struct tcp_sock *tp, struct tcphdr *th) +static int tcp_parse_aligned_timestamp(struct tcp_sock *tp, const struct tcphdr *th) { - __be32 *ptr = (__be32 *)(th + 1); + const __be32 *ptr = (const __be32 *)(th + 1); if (*ptr == htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP)) { @@ -3889,8 +3948,9 @@ static int tcp_parse_aligned_timestamp(struct tcp_sock *tp, struct tcphdr *th) /* Fast parse options. This hopes to only see timestamps. * If it is wrong it falls back on tcp_parse_options(). */ -static int tcp_fast_parse_options(struct sk_buff *skb, struct tcphdr *th, - struct tcp_sock *tp, u8 **hvpp) +static int tcp_fast_parse_options(const struct sk_buff *skb, + const struct tcphdr *th, + struct tcp_sock *tp, const u8 **hvpp) { /* In the spirit of fast parsing, compare doff directly to constant * values. Because equality is used, short doff can be ignored here. @@ -3911,10 +3971,10 @@ static int tcp_fast_parse_options(struct sk_buff *skb, struct tcphdr *th, /* * Parse MD5 Signature option */ -u8 *tcp_parse_md5sig_option(struct tcphdr *th) +const u8 *tcp_parse_md5sig_option(const struct tcphdr *th) { - int length = (th->doff << 2) - sizeof (*th); - u8 *ptr = (u8*)(th + 1); + int length = (th->doff << 2) - sizeof(*th); + const u8 *ptr = (const u8 *)(th + 1); /* If the TCP option is too short, we can short cut */ if (length < TCPOLEN_MD5SIG) @@ -3991,8 +4051,8 @@ 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 = tcp_hdr(skb); + const struct tcp_sock *tp = tcp_sk(sk); + const struct tcphdr *th = tcp_hdr(skb); u32 seq = TCP_SKB_CB(skb)->seq; u32 ack = TCP_SKB_CB(skb)->ack_seq; @@ -4031,7 +4091,7 @@ static inline int tcp_paws_discard(const struct sock *sk, * (borrowed from freebsd) */ -static inline int tcp_sequence(struct tcp_sock *tp, u32 seq, u32 end_seq) +static inline int tcp_sequence(const struct tcp_sock *tp, u32 seq, u32 end_seq) { return !before(end_seq, tp->rcv_wup) && !after(seq, tp->rcv_nxt + tcp_receive_window(tp)); @@ -4076,7 +4136,7 @@ static void tcp_reset(struct sock *sk) * * If we are in FINWAIT-2, a received FIN moves us to TIME-WAIT. */ -static void tcp_fin(struct sk_buff *skb, struct sock *sk, struct tcphdr *th) +static void tcp_fin(struct sock *sk) { struct tcp_sock *tp = tcp_sk(sk); @@ -4188,7 +4248,7 @@ static void tcp_dsack_extend(struct sock *sk, u32 seq, u32 end_seq) tcp_sack_extend(tp->duplicate_sack, seq, end_seq); } -static void tcp_send_dupack(struct sock *sk, struct sk_buff *skb) +static void tcp_send_dupack(struct sock *sk, const struct sk_buff *skb) { struct tcp_sock *tp = tcp_sk(sk); @@ -4347,7 +4407,7 @@ static void tcp_ofo_queue(struct sock *sk) __skb_queue_tail(&sk->sk_receive_queue, skb); tp->rcv_nxt = TCP_SKB_CB(skb)->end_seq; if (tcp_hdr(skb)->fin) - tcp_fin(skb, sk, tcp_hdr(skb)); + tcp_fin(sk); } } @@ -4375,7 +4435,7 @@ static inline int tcp_try_rmem_schedule(struct sock *sk, unsigned int size) static void tcp_data_queue(struct sock *sk, struct sk_buff *skb) { - struct tcphdr *th = tcp_hdr(skb); + const struct tcphdr *th = tcp_hdr(skb); struct tcp_sock *tp = tcp_sk(sk); int eaten = -1; @@ -4429,7 +4489,7 @@ queue_and_out: if (skb->len) tcp_event_data_recv(sk, skb); if (th->fin) - tcp_fin(skb, sk, th); + tcp_fin(sk); if (!skb_queue_empty(&tp->out_of_order_queue)) { tcp_ofo_queue(sk); @@ -4859,9 +4919,9 @@ void tcp_cwnd_application_limited(struct sock *sk) tp->snd_cwnd_stamp = tcp_time_stamp; } -static int tcp_should_expand_sndbuf(struct sock *sk) +static int tcp_should_expand_sndbuf(const struct sock *sk) { - struct tcp_sock *tp = tcp_sk(sk); + const struct tcp_sock *tp = tcp_sk(sk); /* If the user specified a specific send buffer setting, do * not modify it. @@ -4895,8 +4955,10 @@ static void tcp_new_space(struct sock *sk) struct tcp_sock *tp = tcp_sk(sk); 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); + int sndmem = SKB_TRUESIZE(max_t(u32, + tp->rx_opt.mss_clamp, + tp->mss_cache) + + MAX_TCP_HEADER); int demanded = max_t(unsigned int, tp->snd_cwnd, tp->reordering + 1); sndmem *= 2 * demanded; @@ -4968,7 +5030,7 @@ static inline void tcp_ack_snd_check(struct sock *sk) * either form (or just set the sysctl tcp_stdurg). */ -static void tcp_check_urg(struct sock *sk, struct tcphdr *th) +static void tcp_check_urg(struct sock *sk, const struct tcphdr *th) { struct tcp_sock *tp = tcp_sk(sk); u32 ptr = ntohs(th->urg_ptr); @@ -5034,7 +5096,7 @@ static void tcp_check_urg(struct sock *sk, struct tcphdr *th) } /* This is the 'fast' part of urgent handling. */ -static void tcp_urg(struct sock *sk, struct sk_buff *skb, struct tcphdr *th) +static void tcp_urg(struct sock *sk, struct sk_buff *skb, const struct tcphdr *th) { struct tcp_sock *tp = tcp_sk(sk); @@ -5155,9 +5217,9 @@ out: * play significant role here. */ static int tcp_validate_incoming(struct sock *sk, struct sk_buff *skb, - struct tcphdr *th, int syn_inerr) + const struct tcphdr *th, int syn_inerr) { - u8 *hash_location; + const u8 *hash_location; struct tcp_sock *tp = tcp_sk(sk); /* RFC1323: H1. Apply PAWS check first. */ @@ -5238,7 +5300,7 @@ discard: * tcp_data_queue when everything is OK. */ int tcp_rcv_established(struct sock *sk, struct sk_buff *skb, - struct tcphdr *th, unsigned len) + const struct tcphdr *th, unsigned int len) { struct tcp_sock *tp = tcp_sk(sk); int res; @@ -5449,9 +5511,9 @@ discard: EXPORT_SYMBOL(tcp_rcv_established); static int tcp_rcv_synsent_state_process(struct sock *sk, struct sk_buff *skb, - struct tcphdr *th, unsigned len) + const struct tcphdr *th, unsigned int len) { - u8 *hash_location; + const u8 *hash_location; struct inet_connection_sock *icsk = inet_csk(sk); struct tcp_sock *tp = tcp_sk(sk); struct tcp_cookie_values *cvp = tp->cookie_values; @@ -5726,7 +5788,7 @@ reset_and_undo: */ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb, - struct tcphdr *th, unsigned len) + const struct tcphdr *th, unsigned int len) { struct tcp_sock *tp = tcp_sk(sk); struct inet_connection_sock *icsk = inet_csk(sk); |