cregit-Linux how code gets into the kernel

Release 4.11 net/ipv4/tcp_output.c

Directory: net/ipv4
/*
 * INET         An implementation of the TCP/IP protocol suite for the LINUX
 *              operating system.  INET is implemented using the  BSD Socket
 *              interface as the means of communication with the user level.
 *
 *              Implementation of the Transmission Control Protocol(TCP).
 *
 * Authors:     Ross Biro
 *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *              Mark Evans, <evansmp@uhura.aston.ac.uk>
 *              Corey Minyard <wf-rch!minyard@relay.EU.net>
 *              Florian La Roche, <flla@stud.uni-sb.de>
 *              Charles Hedrick, <hedrick@klinzhai.rutgers.edu>
 *              Linus Torvalds, <torvalds@cs.helsinki.fi>
 *              Alan Cox, <gw4pts@gw4pts.ampr.org>
 *              Matthew Dillon, <dillon@apollo.west.oic.com>
 *              Arnt Gulbrandsen, <agulbra@nvg.unit.no>
 *              Jorge Cwik, <jorge@laser.satlink.net>
 */

/*
 * Changes:     Pedro Roque     :       Retransmit queue handled by TCP.
 *                              :       Fragmentation on mtu decrease
 *                              :       Segment collapse on retransmit
 *                              :       AF independence
 *
 *              Linus Torvalds  :       send_delayed_ack
 *              David S. Miller :       Charge memory using the right skb
 *                                      during syn/ack processing.
 *              David S. Miller :       Output engine completely rewritten.
 *              Andrea Arcangeli:       SYNACK carry ts_recent in tsecr.
 *              Cacophonix Gaul :       draft-minshall-nagle-01
 *              J Hadi Salim    :       ECN support
 *
 */


#define pr_fmt(fmt) "TCP: " fmt

#include <net/tcp.h>

#include <linux/compiler.h>
#include <linux/gfp.h>
#include <linux/module.h>

/* People can turn this off for buggy TCP's found in printers etc. */

int sysctl_tcp_retrans_collapse __read_mostly = 1;

/* People can turn this on to work with those rare, broken TCPs that
 * interpret the window field as a signed quantity.
 */

int sysctl_tcp_workaround_signed_windows __read_mostly = 0;

/* Default TSQ limit of four TSO segments */

int sysctl_tcp_limit_output_bytes __read_mostly = 262144;

/* This limits the percentage of the congestion window which we
 * will allow a single TSO frame to consume.  Building TSO frames
 * which are too large can cause TCP streams to be bursty.
 */

int sysctl_tcp_tso_win_divisor __read_mostly = 3;

/* By default, RFC2861 behavior.  */

int sysctl_tcp_slow_start_after_idle __read_mostly = 1;

static bool tcp_write_xmit(struct sock *sk, unsigned int mss_now, int nonagle,
			   int push_one, gfp_t gfp);

/* Account for new data that has been sent to the network. */

static void tcp_event_new_data_sent(struct sock *sk, const struct sk_buff *skb) { struct inet_connection_sock *icsk = inet_csk(sk); struct tcp_sock *tp = tcp_sk(sk); unsigned int prior_packets = tp->packets_out; tcp_advance_send_head(sk, skb); tp->snd_nxt = TCP_SKB_CB(skb)->end_seq; tp->packets_out += tcp_skb_pcount(skb); if (!prior_packets || icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) tcp_rearm_rto(sk); NET_ADD_STATS(sock_net(sk), LINUX_MIB_TCPORIGDATASENT, tcp_skb_pcount(skb)); }

Contributors

PersonTokensPropCommitsCommitProp
Ilpo Järvinen5149.51%216.67%
Yuchung Cheng1615.53%216.67%
Nandita Dukkipati1514.56%18.33%
Linus Torvalds (pre-git)1312.62%216.67%
David S. Miller54.85%216.67%
Eric Dumazet21.94%216.67%
Arnaldo Carvalho de Melo10.97%18.33%
Total103100.00%12100.00%

/* SND.NXT, if window was not shrunk or the amount of shrunk was less than one * window scaling factor due to loss of precision. * If window has been shrunk, what should we make? It is not clear at all. * Using SND.UNA we will fail to open window, SND.NXT is out of window. :-( * Anything in between SND.UNA...SND.UNA+SND.WND also can be already * invalid. OK, let's make this for now: */
static inline __u32 tcp_acceptable_seq(const struct sock *sk) { const struct tcp_sock *tp = tcp_sk(sk); if (!before(tcp_wnd_end(tp), tp->snd_nxt) || (tp->rx_opt.wscale_ok && ((tp->snd_nxt - tcp_wnd_end(tp)) < (1 << tp->rx_opt.rcv_wscale)))) return tp->snd_nxt; else return tcp_wnd_end(tp); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)3340.24%228.57%
Cui, Cheng3137.80%114.29%
Ilpo Järvinen1417.07%228.57%
Arnaldo Carvalho de Melo22.44%114.29%
Eric Dumazet22.44%114.29%
Total82100.00%7100.00%

/* Calculate mss to advertise in SYN segment. * RFC1122, RFC1063, draft-ietf-tcpimpl-pmtud-01 state that: * * 1. It is independent of path mtu. * 2. Ideally, it is maximal possible segment size i.e. 65535-40. * 3. For IPv4 it is reasonable to calculate it from maximal MTU of * attached devices, because some buggy hosts are confused by * large MSS. * 4. We do not make 3, we advertise MSS, calculated from first * hop device mtu, but allow to raise it to ip_rt_min_advmss. * This may be overridden via information stored in routing table. * 5. Value 65535 for MSS is valid in IPv6 and means "as large as possible, * probably even Jumbo". */
static __u16 tcp_advertise_mss(struct sock *sk) { struct tcp_sock *tp = tcp_sk(sk); const struct dst_entry *dst = __sk_dst_get(sk); int mss = tp->advmss; if (dst) { unsigned int metric = dst_metric_advmss(dst); if (metric < mss) { mss = metric; tp->advmss = mss; } } return (__u16)mss; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)5874.36%228.57%
David S. Miller1620.51%228.57%
Alexey Kuznetsov22.56%114.29%
Eric Dumazet11.28%114.29%
Arnaldo Carvalho de Melo11.28%114.29%
Total78100.00%7100.00%

/* RFC2861. Reset CWND after idle period longer RTO to "restart window". * This is the first part of cwnd validation mechanism. */
void tcp_cwnd_restart(struct sock *sk, s32 delta) { struct tcp_sock *tp = tcp_sk(sk); u32 restart_cwnd = tcp_init_cwnd(tp, __sk_dst_get(sk)); u32 cwnd = tp->snd_cwnd; tcp_ca_event(sk, CA_EVENT_CWND_RESTART); tp->snd_ssthresh = tcp_current_ssthresh(sk); restart_cwnd = min(restart_cwnd, cwnd); while ((delta -= inet_csk(sk)->icsk_rto) > 0 && cwnd > restart_cwnd) cwnd >>= 1; tp->snd_cwnd = max(cwnd, restart_cwnd); tp->snd_cwnd_stamp = tcp_time_stamp; tp->snd_cwnd_used = 0; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)7969.30%112.50%
Arnaldo Carvalho de Melo1916.67%225.00%
Eric Dumazet65.26%112.50%
David S. Miller54.39%225.00%
Stephen Hemminger32.63%112.50%
Linus Torvalds21.75%112.50%
Total114100.00%8100.00%

/* Congestion state accounting after a packet has been sent. */
static void tcp_event_data_sent(struct tcp_sock *tp, struct sock *sk) { struct inet_connection_sock *icsk = inet_csk(sk); const u32 now = tcp_time_stamp; if (tcp_packets_in_flight(tp) == 0) tcp_ca_event(sk, CA_EVENT_TX_START); tp->lsndtime = now; /* If it is a reply for ato after last received * packet, enter pingpong mode. */ if ((u32)(now - icsk->icsk_ack.lrcvtime) < icsk->icsk_ack.ato) icsk->icsk_ack.pingpong = 1; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)4755.95%233.33%
Arnaldo Carvalho de Melo1821.43%233.33%
Neal Cardwell1619.05%116.67%
David S. Miller33.57%116.67%
Total84100.00%6100.00%

/* Account for an ACK we sent. */
static inline void tcp_event_ack_sent(struct sock *sk, unsigned int pkts) { tcp_dec_quickack_mode(sk, pkts); inet_csk_clear_xmit_timer(sk, ICSK_TIME_DACK); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)2066.67%350.00%
David S. Miller620.00%116.67%
Arnaldo Carvalho de Melo310.00%116.67%
Stephen Hemminger13.33%116.67%
Total30100.00%6100.00%


u32 tcp_default_init_rwnd(u32 mss) { /* Initial receive window should be twice of TCP_INIT_CWND to * enable proper sending of new unsent data during fast recovery * (RFC 3517, Section 4, NextSeg() rule (2)). Further place a * limit when mss is larger than 1460. */ u32 init_rwnd = TCP_INIT_CWND * 2; if (mss > 1460) init_rwnd = max((1460 * init_rwnd) / mss, 2U); return init_rwnd; }

Contributors

PersonTokensPropCommitsCommitProp
Yuchung Cheng3997.50%150.00%
Weiping Pan (潘卫平)12.50%150.00%
Total40100.00%2100.00%

/* Determine a window scaling and initial window to offer. * Based on the assumption that the given amount of space * will be offered. Store the results in the tp structure. * NOTE: for smooth operation initial space offering should * be a multiple of mss if possible. We assume here that mss >= 1. * This MUST be enforced by all callers. */
void tcp_select_initial_window(int __space, __u32 mss, __u32 *rcv_wnd, __u32 *window_clamp, int wscale_ok, __u8 *rcv_wscale, __u32 init_rcv_wnd) { unsigned int space = (__space < 0 ? 0 : __space); /* If no clamp set the clamp to the max possible scaled window */ if (*window_clamp == 0) (*window_clamp) = (65535 << 14); space = min(*window_clamp, space); /* Quantize space offering to a multiple of mss if possible. */ if (space > mss) space = (space / mss) * mss; /* NOTE: offering an initial window larger than 32767 * will break some buggy TCP stacks. If the admin tells us * it is likely we could be speaking with such a buggy stack * we will truncate our initial window offering to 32K-1 * unless the remote has sent us a window scaling option, * which we interpret as a sign the remote TCP is not * misinterpreting the window field as a signed quantity. */ if (sysctl_tcp_workaround_signed_windows) (*rcv_wnd) = min(space, MAX_TCP_WINDOW); else (*rcv_wnd) = space; (*rcv_wscale) = 0; if (wscale_ok) { /* Set window scaling on max possible window * See RFC1323 for an explanation of the limit to 14 */ space = max_t(u32, space, sysctl_tcp_rmem[2]); space = max_t(u32, space, sysctl_rmem_max); space = min_t(u32, space, *window_clamp); while (space > 65535 && (*rcv_wscale) < 14) { space >>= 1; (*rcv_wscale)++; } } if (mss > (1 << *rcv_wscale)) { if (!init_rcv_wnd) /* Use default unless specified otherwise */ init_rcv_wnd = tcp_default_init_rwnd(mss); *rcv_wnd = min(*rcv_wnd, init_rcv_wnd * mss); } /* Set the clamp no higher than max representable value */ (*window_clamp) = min(65535U << (*rcv_wscale), *window_clamp); }

Contributors

PersonTokensPropCommitsCommitProp
Stephen Hemminger20181.05%225.00%
Rick Jones135.24%112.50%
Soheil Hassas Yeganeh114.44%112.50%
Laurent Chavey104.03%112.50%
Nandita Dukkipati72.82%112.50%
Yuchung Cheng52.02%112.50%
Hideaki Yoshifuji / 吉藤英明10.40%112.50%
Total248100.00%8100.00%

EXPORT_SYMBOL(tcp_select_initial_window); /* Chose a new window to advertise, update state in tcp_sock for the * socket, and return result with RFC1323 scaling applied. The return * value can be stuffed directly into th->window for an outgoing * frame. */
static u16 tcp_select_window(struct sock *sk) { struct tcp_sock *tp = tcp_sk(sk); u32 old_win = tp->rcv_wnd; u32 cur_win = tcp_receive_window(tp); u32 new_win = __tcp_select_window(sk); /* Never shrink the offered window */ if (new_win < cur_win) { /* Danger Will Robinson! * Don't update rcv_wup/rcv_wnd here or else * we will not be able to advertise a zero * window in time. --DaveM * * Relax Will Robinson. */ if (new_win == 0) NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPWANTZEROWINDOWADV); new_win = ALIGN(cur_win, 1 << tp->rx_opt.rcv_wscale); } tp->rcv_wnd = new_win; tp->rcv_wup = tp->rcv_nxt; /* Make sure we do not exceed the maximum possible * scaled window. */ if (!tp->rx_opt.rcv_wscale && sysctl_tcp_workaround_signed_windows) new_win = min(new_win, MAX_TCP_WINDOW); else new_win = min(new_win, (65535U << tp->rx_opt.rcv_wscale)); /* RFC1323 scaling applied */ new_win >>= tp->rx_opt.rcv_wscale; /* If we advertise zero window, disable fast path. */ if (new_win == 0) { tp->pred_flags = 0; if (old_win) NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPTOZEROWINDOWADV); } else if (old_win == 0) { NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPFROMZEROWINDOWADV); } return new_win; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)8341.92%220.00%
Florian Westphal5829.29%110.00%
David S. Miller3618.18%220.00%
Patrick McHardy115.56%110.00%
Arnaldo Carvalho de Melo73.54%220.00%
Rick Jones21.01%110.00%
Linus Torvalds10.51%110.00%
Total198100.00%10100.00%

/* Packet ECN state for a SYN-ACK */
static void tcp_ecn_send_synack(struct sock *sk, struct sk_buff *skb) { const struct tcp_sock *tp = tcp_sk(sk); TCP_SKB_CB(skb)->tcp_flags &= ~TCPHDR_CWR; if (!(tp->ecn_flags & TCP_ECN_OK)) TCP_SKB_CB(skb)->tcp_flags &= ~TCPHDR_ECE; else if (tcp_ca_needs_ecn(sk)) INET_ECN_xmit(sk); }

Contributors

PersonTokensPropCommitsCommitProp
Ilpo Järvinen4056.34%120.00%
Daniel Borkmann2636.62%120.00%
Changli Gao22.82%120.00%
Eric Dumazet22.82%120.00%
Florian Westphal11.41%120.00%
Total71100.00%5100.00%

/* Packet ECN state for a SYN. */
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 (use_ecn) { TCP_SKB_CB(skb)->tcp_flags |= TCPHDR_ECE | TCPHDR_CWR; tp->ecn_flags = TCP_ECN_OK; if (tcp_ca_needs_ecn(sk)) INET_ECN_xmit(sk); } }

Contributors

PersonTokensPropCommitsCommitProp
Florian Westphal4739.50%225.00%
Ilpo Järvinen4537.82%225.00%
Daniel Borkmann1714.29%112.50%
Hannes Frederic Sowa75.88%112.50%
Changli Gao21.68%112.50%
Eric Dumazet10.84%112.50%
Total119100.00%8100.00%


static void tcp_ecn_clear_syn(struct sock *sk, struct sk_buff *skb) { if (sock_net(sk)->ipv4.sysctl_tcp_ecn_fallback) /* tp->ecn_flags are cleared at a later point in time when * SYN ACK is ultimatively being received. */ TCP_SKB_CB(skb)->tcp_flags &= ~(TCPHDR_ECE | TCPHDR_CWR); }

Contributors

PersonTokensPropCommitsCommitProp
Daniel Borkmann42100.00%1100.00%
Total42100.00%1100.00%


static void tcp_ecn_make_synack(const struct request_sock *req, struct tcphdr *th) { if (inet_rsk(req)->ecn_ok) th->ece = 1; }

Contributors

PersonTokensPropCommitsCommitProp
Ilpo Järvinen3093.75%133.33%
Florian Westphal13.12%133.33%
Eric Dumazet13.12%133.33%
Total32100.00%3100.00%

/* Set up ECN state for a packet on a ESTABLISHED socket that is about to * be sent. */
static void tcp_ecn_send(struct sock *sk, struct sk_buff *skb, struct tcphdr *th, int tcp_header_len) { struct tcp_sock *tp = tcp_sk(sk); if (tp->ecn_flags & TCP_ECN_OK) { /* Not-retransmitted data segment: set ECT and inject CWR. */ if (skb->len != tcp_header_len && !before(TCP_SKB_CB(skb)->seq, tp->snd_nxt)) { INET_ECN_xmit(sk); if (tp->ecn_flags & TCP_ECN_QUEUE_CWR) { tp->ecn_flags &= ~TCP_ECN_QUEUE_CWR; th->cwr = 1; skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; } } else if (!tcp_ca_needs_ecn(sk)) { /* ACK or retransmitted segment: clear ECT|CE */ INET_ECN_dontxmit(sk); } if (tp->ecn_flags & TCP_ECN_DEMAND_CWR) th->ece = 1; } }

Contributors

PersonTokensPropCommitsCommitProp
Ilpo Järvinen12187.68%125.00%
Daniel Borkmann96.52%125.00%
Eric Dumazet75.07%125.00%
Florian Westphal10.72%125.00%
Total138100.00%4100.00%

/* Constructs common control bits of non-data skb. If SYN/FIN is present, * auto increment end seqno. */
static void tcp_init_nondata_skb(struct sk_buff *skb, u32 seq, u8 flags) { skb->ip_summed = CHECKSUM_PARTIAL; skb->csum = 0; TCP_SKB_CB(skb)->tcp_flags = flags; TCP_SKB_CB(skb)->sacked = 0; tcp_skb_pcount_set(skb, 1); TCP_SKB_CB(skb)->seq = seq; if (flags & (TCPHDR_SYN | TCPHDR_FIN)) seq++; TCP_SKB_CB(skb)->end_seq = seq; }

Contributors

PersonTokensPropCommitsCommitProp
Ilpo Järvinen7183.53%120.00%
David S. Miller67.06%120.00%
Eric Dumazet67.06%240.00%
Changli Gao22.35%120.00%
Total85100.00%5100.00%


static inline bool tcp_urg_mode(const struct tcp_sock *tp) { return tp->snd_una != tp->snd_up; }

Contributors

PersonTokensPropCommitsCommitProp
Ilpo Järvinen2195.45%150.00%
Eric Dumazet14.55%150.00%
Total22100.00%2100.00%

#define OPTION_SACK_ADVERTISE (1 << 0) #define OPTION_TS (1 << 1) #define OPTION_MD5 (1 << 2) #define OPTION_WSCALE (1 << 3) #define OPTION_FAST_OPEN_COOKIE (1 << 8) struct tcp_out_options { u16 options; /* bit field of OPTION_* */ u16 mss; /* 0 to disable */ u8 ws; /* window scale, 0 to disable */ u8 num_sack_blocks; /* number of SACK blocks to include */ u8 hash_size; /* bytes in hash_location */ __u8 *hash_location; /* temporary pointer, overloaded */ __u32 tsval, tsecr; /* need to include OPTION_TS */ struct tcp_fastopen_cookie *fastopen_cookie; /* Fast open cookie */ }; /* Write previously computed TCP options to the packet. * * Beware: Something in the Internet is very sensitive to the ordering of * TCP options, we learned this through the hard way, so be careful here. * Luckily we can at least blame others for their non-compliance but from * inter-operability perspective it seems that we're somewhat stuck with * the ordering which we have been using if we want to keep working with * those broken things (not that it currently hurts anybody as there isn't * particular reason why the ordering would need to be changed). * * At least SACK_PERM as the first option is known to lead to a disaster * (but it may well be that other scenarios fail similarly). */
static void tcp_options_write(__be32 *ptr, struct tcp_sock *tp, struct tcp_out_options *opts) { u16 options = opts->options; /* mungable copy */ if (unlikely(OPTION_MD5 & options)) { *ptr++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); /* overload cookie hash location */ opts->hash_location = (__u8 *)ptr; ptr += 4; } if (unlikely(opts->mss)) { *ptr++ = htonl((TCPOPT_MSS << 24) | (TCPOLEN_MSS << 16) | opts->mss); } if (likely(OPTION_TS & options)) { if (unlikely(OPTION_SACK_ADVERTISE & options)) { *ptr++ = htonl((TCPOPT_SACK_PERM << 24) | (TCPOLEN_SACK_PERM << 16) | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); options &= ~OPTION_SACK_ADVERTISE; } else { *ptr++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); } *ptr++ = htonl(opts->tsval); *ptr++ = htonl(opts->tsecr); } if (unlikely(OPTION_SACK_ADVERTISE & options)) { *ptr++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | (TCPOPT_SACK_PERM << 8) | TCPOLEN_SACK_PERM); } if (unlikely(OPTION_WSCALE & options)) { *ptr++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_WINDOW << 16) | (TCPOLEN_WINDOW << 8) | opts->ws); } if (unlikely(opts->num_sack_blocks)) { struct tcp_sack_block *sp = tp->rx_opt.dsack ? tp->duplicate_sack : tp->selective_acks; int this_sack; *ptr++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | (TCPOPT_SACK << 8) | (TCPOLEN_SACK_BASE + (opts->num_sack_blocks * TCPOLEN_SACK_PERBLOCK))); for (this_sack = 0; this_sack < opts->num_sack_blocks; ++this_sack) { *ptr++ = htonl(sp[this_sack].start_seq); *ptr++ = htonl(sp[this_sack].end_seq); } tp->rx_opt.dsack = 0; } if (unlikely(OPTION_FAST_OPEN_COOKIE & options)) { struct tcp_fastopen_cookie *foc = opts->fastopen_cookie; u8 *p = (u8 *)ptr; u32 len; /* Fast Open option length */ if (foc->exp) { len = TCPOLEN_EXP_FASTOPEN_BASE + foc->len; *ptr = htonl((TCPOPT_EXP << 24) | (len << 16) | TCPOPT_FASTOPEN_MAGIC); p += TCPOLEN_EXP_FASTOPEN_BASE; } else { len = TCPOLEN_FASTOPEN_BASE + foc->len; *p++ = TCPOPT_FASTOPEN; *p++ = len; } memcpy(p, foc->val, foc->len); if ((len & 3) == 2) { p[foc->len] = TCPOPT_NOP; p[foc->len + 1] = TCPOPT_NOP; } ptr += (len + 3) >> 2; } }

Contributors

PersonTokensPropCommitsCommitProp
Adam Langley17831.01%110.00%
Stephen Hemminger15026.13%110.00%
Yuchung Cheng8614.98%110.00%
Daniel Lee6711.67%110.00%
Ilpo Järvinen345.92%110.00%
Hideaki Yoshifuji / 吉藤英明325.57%220.00%
William Allen Simpson234.01%110.00%
Ori Finkelman30.52%110.00%
Al Viro10.17%110.00%
Total574100.00%10100.00%

/* Compute TCP options for SYN packets. This is not the final * network wire format yet. */
static unsigned int tcp_syn_options(struct sock *sk, struct sk_buff *skb, struct tcp_out_options *opts, struct tcp_md5sig_key **md5) { struct tcp_sock *tp = tcp_sk(sk); unsigned int remaining = MAX_TCP_OPTION_SPACE; struct tcp_fastopen_request *fastopen = tp->fastopen_req; #ifdef CONFIG_TCP_MD5SIG *md5 = tp->af_specific->md5_lookup(sk, sk); if (*md5) { opts->options |= OPTION_MD5; remaining -= TCPOLEN_MD5SIG_ALIGNED; } #else *md5 = NULL; #endif /* We always get an MSS option. The option bytes which will be seen in * normal data packets should timestamps be used, must be in the MSS * advertised. But we subtract them from tp->mss_cache so that * calculations in tcp_sendmsg are simpler etc. So account for this * fact here if necessary. If we don't do this correctly, as a * receiver we won't recognize data packets as being full sized when we * should, and thus we won't abide by the delayed ACK rules correctly. * SACKs don't matter, we never delay an ACK when we have any of those * going out. */ opts->mss = tcp_advertise_mss(sk); remaining -= TCPOLEN_MSS_ALIGNED; if (likely(sysctl_tcp_timestamps && !*md5)) { opts->options |= OPTION_TS; opts->tsval = tcp_skb_timestamp(skb) + tp->tsoffset; opts->tsecr = tp->rx_opt.ts_recent; remaining -= TCPOLEN_TSTAMP_ALIGNED; } if (likely(sysctl_tcp_window_scaling)) { opts->ws = tp->rx_opt.rcv_wscale; opts->options |= OPTION_WSCALE; remaining -= TCPOLEN_WSCALE_ALIGNED; } if (likely(sysctl_tcp_sack)) { opts->options |= OPTION_SACK_ADVERTISE; if (unlikely(!(OPTION_TS & opts->options))) remaining -= TCPOLEN_SACKPERM_ALIGNED; } if (fastopen && fastopen->cookie.len >= 0) { u32 need = fastopen->cookie.len; need += fastopen->cookie.exp ? TCPOLEN_EXP_FASTOPEN_BASE : TCPOLEN_FASTOPEN_BASE; need = (need + 3) & ~3U; /* Align to 32 bits */ if (remaining >= need) { opts->options |= OPTION_FAST_OPEN_COOKIE; opts->fastopen_cookie = &fastopen->cookie; remaining -= need; tp->syn_fastopen = 1; tp->syn_fastopen_exp = fastopen->cookie.exp ? 1 : 0; } } return MAX_TCP_OPTION_SPACE - remaining; }

Contributors

PersonTokensPropCommitsCommitProp
Adam Langley17555.21%18.33%
Yuchung Cheng7724.29%18.33%
Daniel Lee268.20%18.33%
William Allen Simpson185.68%18.33%
Stephen Hemminger51.58%18.33%
Andrey Vagin41.26%18.33%
Ori Finkelman41.26%18.33%
Eric Dumazet30.95%216.67%
David S. Miller20.63%18.33%
Philip Love20.63%18.33%
Ian Morris10.32%18.33%
Total317100.00%12100.00%

/* Set up TCP options for SYN-ACKs. */
static unsigned int tcp_synack_options(struct request_sock *req, unsigned int mss, struct sk_buff *skb, struct tcp_out_options *opts, const struct tcp_md5sig_key *md5, struct tcp_fastopen_cookie *foc) { struct inet_request_sock *ireq = inet_rsk(req); unsigned int remaining = MAX_TCP_OPTION_SPACE; #ifdef CONFIG_TCP_MD5SIG if (md5) { opts->options |= OPTION_MD5; remaining -= TCPOLEN_MD5SIG_ALIGNED; /* We can't fit any SACK blocks in a packet with MD5 + TS * options. There was discussion about disabling SACK * rather than TS in order to fit in better with old, * buggy kernels, but that was deemed to be unnecessary. */ ireq->tstamp_ok &= !ireq->sack_ok; } #endif /* We always send an MSS option. */ opts->mss = mss; remaining -= TCPOLEN_MSS_ALIGNED; if (likely(ireq->wscale_ok)) { opts->ws = ireq->rcv_wscale; opts->options |= OPTION_WSCALE; remaining -= TCPOLEN_WSCALE_ALIGNED; } if (likely(ireq->tstamp_ok)) { opts->options |= OPTION_TS; opts->tsval = tcp_skb_timestamp(skb) + tcp_rsk(req)->ts_off; opts->tsecr = req->ts_recent; remaining -= TCPOLEN_TSTAMP_ALIGNED; } if (likely(ireq->sack_ok)) { opts->options |= OPTION_SACK_ADVERTISE; if (unlikely(!ireq->tstamp_ok)) remaining -= TCPOLEN_SACKPERM_ALIGNED; } if (foc != NULL && foc->len >= 0) { u32 need = foc->len; need += foc->exp ? TCPOLEN_EXP_FASTOPEN_BASE : TCPOLEN_FASTOPEN_BASE; need = (need + 3) & ~3U; /* Align to 32 bits */ if (remaining >= need) { opts->options |= OPTION_FAST_OPEN_COOKIE; opts->fastopen_cookie = foc; remaining -= need; } } return MAX_TCP_OPTION_SPACE - remaining; }

Contributors

PersonTokensPropCommitsCommitProp
Adam Langley14452.94%17.69%
William Allen Simpson5821.32%17.69%
Christoph Paasch207.35%17.69%
Eric Dumazet145.15%430.77%
Daniel Lee124.41%17.69%
Florian Westphal72.57%17.69%
Yuchung Cheng62.21%17.69%
Jerry Chu51.84%17.69%
Ori Finkelman41.47%17.69%
Philip Love20.74%17.69%
Total272100.00%13100.00%

/* Compute TCP options for ESTABLISHED sockets. This is not the * final wire format yet. */
static unsigned int tcp_established_options(struct sock *sk, struct sk_buff *skb, struct tcp_out_options *opts, struct tcp_md5sig_key **md5) { struct tcp_sock *tp = tcp_sk(sk); unsigned int size = 0; unsigned int eff_sacks; opts->options = 0; #ifdef CONFIG_TCP_MD5SIG *md5 = tp->af_specific->md5_lookup(sk, sk); if (unlikely(*md5)) { opts->options |= OPTION_MD5; size += TCPOLEN_MD5SIG_ALIGNED; } #else *md5 = NULL; #endif if (likely(tp->rx_opt.tstamp_ok)) { opts->options |= OPTION_TS; opts->tsval = skb ? tcp_skb_timestamp(skb) + tp->tsoffset : 0; opts->tsecr = tp->rx_opt.ts_recent; size += TCPOLEN_TSTAMP_ALIGNED; } eff_sacks = tp->rx_opt.num_sacks + tp->rx_opt.dsack; if (unlikely(eff_sacks)) { const unsigned int remaining = MAX_TCP_OPTION_SPACE - size; opts->num_sack_blocks = min_t(unsigned int, eff_sacks, (remaining - TCPOLEN_SACK_BASE_ALIGNED) / TCPOLEN_SACK_PERBLOCK); size += TCPOLEN_SACK_BASE_ALIGNED + opts->num_sack_blocks * TCPOLEN_SACK_PERBLOCK; } return size; }

Contributors

PersonTokensPropCommitsCommitProp
Adam Langley15474.04%112.50%
Ilpo Järvinen188.65%112.50%
Eric Dumazet115.29%225.00%
Hideaki Yoshifuji / 吉藤英明94.33%112.50%
Andi Kleen62.88%112.50%
Stephen Hemminger62.88%112.50%
Andrey Vagin41.92%112.50%
Total208100.00%8100.00%

/* TCP SMALL QUEUES (TSQ) * * TSQ goal is to keep small amount of skbs per tcp flow in tx queues (qdisc+dev) * to reduce RTT and bufferbloat. * We do this using a special skb destructor (tcp_wfree). * * Its important tcp_wfree() can be replaced by sock_wfree() in the event skb * needs to be reallocated in a driver. * The invariant being skb->truesize subtracted from sk->sk_wmem_alloc * * Since transmit from skb destructor is forbidden, we use a tasklet * to process all sockets that eventually need to send more skbs. * We use one tasklet per cpu, with its own queue of sockets. */ struct tsq_tasklet { struct tasklet_struct tasklet; struct list_head head; /* queue of tcp sockets */ }; static DEFINE_PER_CPU(struct tsq_tasklet, tsq_tasklet);
static void tcp_tsq_handler(struct sock *sk) { if ((1 << sk->sk_state) & (TCPF_ESTABLISHED | TCPF_FIN_WAIT1 | TCPF_CLOSING | TCPF_CLOSE_WAIT | TCPF_LAST_ACK)) { struct tcp_sock *tp = tcp_sk(sk); if (tp->lost_out > tp->retrans_out && tp->snd_cwnd > tcp_packets_in_flight(tp)) tcp_xmit_retransmit_queue(sk); tcp_write_xmit(sk, tcp_current_mss(sk), tp->nonagle, 0, GFP_ATOMIC); } }

Contributors

PersonTokensPropCommitsCommitProp
Eric Dumazet8294.25%266.67%
John Ogness55.75%133.33%
Total87100.00%3100.00%

/* * One tasklet per cpu tries to send more skbs. * We run in tasklet context but need to disable irqs when * transferring tsq->head because tcp_wfree() might * interrupt us (non NAPI drivers) */
static void tcp_tasklet_func(unsigned long data) { struct tsq_tasklet *tsq = (struct tsq_tasklet *)data; LIST_HEAD(list); unsigned long flags; struct list_head *q, *n; struct tcp_sock *tp; struct sock *sk; local_irq_save(flags); list_splice_init(&tsq->head, &list); local_irq_restore(flags); list_for_each_safe(q, n, &list) { tp = list_entry(q, struct tcp_sock, tsq_node); list_del(&tp->tsq_node); sk = (struct sock *)tp; smp_mb__before_atomic(); clear_bit(TSQ_QUEUED, &sk->sk_tsq_flags); if (!sk->sk_lock.owned && test_bit(TCP_TSQ_DEFERRED, &sk->sk_tsq_flags)) { bh_lock_sock(sk); if (!sock_owned_by_user(sk)) { clear_bit(TCP_TSQ_DEFERRED, &sk->sk_tsq_flags); tcp_tsq_handler(sk); } bh_unlock_sock(sk); } sk_free(sk); } }

Contributors

PersonTokensPropCommitsCommitProp
Eric Dumazet183100.00%5100.00%
Total183100.00%5100.00%

#define TCP_DEFERRED_ALL (TCPF_TSQ_DEFERRED | \ TCPF_WRITE_TIMER_DEFERRED | \ TCPF_DELACK_TIMER_DEFERRED | \ TCPF_MTU_REDUCED_DEFERRED) /** * tcp_release_cb - tcp release_sock() callback * @sk: socket * * called from release_sock() to perform protocol dependent * actions before socket release. */
void tcp_release_cb(struct sock *sk) { unsigned long flags, nflags; /* perform an atomic operation only if at least one flag is set */ do { flags = sk->sk_tsq_flags; if (!(flags & TCP_DEFERRED_ALL)) return; nflags = flags & ~TCP_DEFERRED_ALL; } while (cmpxchg(&sk->sk_tsq_flags, flags, nflags) != flags); if (flags & TCPF_TSQ_DEFERRED) tcp_tsq_handler(sk); /* Here begins the tricky part : * We are called from release_sock() with : * 1) BH disabled * 2) sk_lock.slock spinlock held * 3) socket owned by us (sk->sk_lock.owned == 1) * * But following code is meant to be called from BH handlers, * so we should keep BH disabled, but early release socket ownership */ sock_release_ownership(sk); if (flags & TCPF_WRITE_TIMER_DEFERRED) { tcp_write_timer_handler(sk); __sock_put(sk); } if (flags & TCPF_DELACK_TIMER_DEFERRED) { tcp_delack_timer_handler(sk); __sock_put(sk); } if (flags & TCPF_MTU_REDUCED_DEFERRED) { inet_csk(sk)->icsk_af_ops->mtu_reduced(sk); __sock_put(sk); } }

Contributors

PersonTokensPropCommitsCommitProp
Eric Dumazet13497.10%787.50%
Neal Cardwell42.90%112.50%
Total138100.00%8100.00%

EXPORT_SYMBOL(tcp_release_cb);
void __init tcp_tasklet_init(void) { int i; for_each_possible_cpu(i) { struct tsq_tasklet *tsq = &per_cpu(tsq_tasklet, i); INIT_LIST_HEAD(&tsq->head); tasklet_init(&tsq->tasklet, tcp_tasklet_func, (unsigned long)tsq); } }

Contributors

PersonTokensPropCommitsCommitProp
Eric Dumazet54100.00%1100.00%
Total54100.00%1100.00%

/* * Write buffer destructor automatically called from kfree_skb. * We can't xmit new skbs from this context, as we might already * hold qdisc lock. */
void tcp_wfree(struct sk_buff *skb) { struct sock *sk = skb->sk; struct tcp_sock *tp = tcp_sk(sk); unsigned long flags, nval, oval; int wmem; /* Keep one reference on sk_wmem_alloc. * Will be released by sk_free() from here or tcp_tasklet_func() */ wmem = atomic_sub_return(skb->truesize - 1, &sk->sk_wmem_alloc); /* If this softirq is serviced by ksoftirqd, we are likely under stress. * Wait until our queues (qdisc + devices) are drained. * This gives : * - less callbacks to tcp_write_xmit(), reducing stress (batches) * - chance for incoming ACK (processed by another cpu maybe) * to migrate this flow (skb->ooo_okay will be eventually set) */ if (wmem >= SKB_TRUESIZE(1) && this_cpu_ksoftirqd() == current) goto out; for (oval = READ_ONCE(sk->sk_tsq_flags);; oval = nval) { struct tsq_tasklet *tsq; bool empty; if (!(oval & TSQF_THROTTLED) || (oval & TSQF_QUEUED)) goto out; nval = (oval & ~TSQF_THROTTLED) | TSQF_QUEUED | TCPF_TSQ_DEFERRED; nval = cmpxchg(&sk->sk_tsq_flags, oval, nval); if (nval != oval) continue; /* queue this socket to tasklet queue */ local_irq_save(flags); tsq = this_cpu_ptr(&tsq_tasklet); empty = list_empty(&tsq->head); list_add(&tp->tsq_node, &tsq->head); if (empty) tasklet_schedule(&tsq->tasklet); local_irq_restore(flags); return; } out: sk_free(sk); }

Contributors

PersonTokensPropCommitsCommitProp
Eric Dumazet21399.07%685.71%
Christoph Lameter20.93%114.29%
Total215100.00%7100.00%

/* This routine actually transmits TCP packets queued in by * tcp_do_sendmsg(). This is used by both the initial * transmission and possible later retransmissions. * All SKB's seen here are completely headerless. It is our * job to build the TCP header, and pass the packet down to * IP so it can do the same plus pass the packet off to the * device. * * We are working here with either a clone of the original * SKB, or a fresh unique copy made by the retransmit engine. */
static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, int clone_it, gfp_t gfp_mask) { const struct inet_connection_sock *icsk = inet_csk(sk); struct inet_sock *inet; struct tcp_sock *tp; struct tcp_skb_cb *tcb; struct tcp_out_options opts; unsigned int tcp_options_size, tcp_header_size; struct tcp_md5sig_key *md5; struct tcphdr *th; int err; BUG_ON(!skb || !tcp_skb_pcount(skb)); tp = tcp_sk(sk); if (clone_it) { skb_mstamp_get(&skb->skb_mstamp); TCP_SKB_CB(skb)->tx.in_flight = TCP_SKB_CB(skb)->end_seq - tp->snd_una; tcp_rate_skb_sent(sk, skb); if (unlikely(skb_cloned(skb))) skb = pskb_copy(skb, gfp_mask); else skb = skb_clone(skb, gfp_mask); if (unlikely(!skb)) return -ENOBUFS; } inet = inet_sk(sk); tcb = TCP_SKB_CB(skb); memset(&opts, 0, sizeof(opts)); if (unlikely(tcb->tcp_flags & TCPHDR_SYN)) tcp_options_size = tcp_syn_options(sk, skb, &opts, &md5); else tcp_options_size = tcp_established_options(sk, skb, &opts, &md5); tcp_header_size = tcp_options_size + sizeof(struct tcphdr); /* if no packet is in qdisc/device queue, then allow XPS to select * another queue. We can be called from tcp_tsq_handler() * which holds one reference to sk_wmem_alloc. * * TODO: Ideally, in-flight pure ACK packets should not matter here. * One way to get this would be to set skb->truesize = 2 on them. */ skb->ooo_okay = sk_wmem_alloc_get(sk) < SKB_TRUESIZE(1); /* If we had to use memory reserve to allocate this skb, * this might cause drops if packet is looped back : * Other socket might not have SOCK_MEMALLOC. * Packets not looped back do not care about pfmemalloc. */ skb->pfmemalloc = 0; skb_push(skb, tcp_header_size); skb_reset_transport_header(skb); skb_orphan(skb); skb->sk = sk; skb->destructor = skb_is_tcp_pure_ack(skb) ? __sock_wfree : tcp_wfree; skb_set_hash_from_sk(skb, sk); atomic_add(skb->truesize, &sk->sk_wmem_alloc); skb_set_dst_pending_confirm(skb, sk->sk_dst_pending_confirm); /* Build TCP header and checksum it. */ th = (struct tcphdr *)skb->data; th->source = inet->inet_sport; th->dest = inet->inet_dport; th->seq = htonl(tcb->seq); th->ack_seq = htonl(tp->rcv_nxt); *(((__be16 *)th) + 6) = htons(((tcp_header_size >> 2) << 12) | tcb->tcp_flags); th->check = 0; th->urg_ptr = 0; /* The urg_mode check is necessary during a below snd_una win probe */ if (unlikely(tcp_urg_mode(tp) && before(tcb->seq, tp->snd_up))) { if (before(tp->snd_up, tcb->seq + 0x10000)) { th->urg_ptr = htons(tp->snd_up - tcb->seq); th->urg = 1; } else if (after(tcb->seq + 0xFFFF, tp->snd_nxt)) { th->urg_ptr = htons(0xFFFF); th->urg = 1; } } tcp_options_write((__be32 *)(th + 1), tp, &opts); skb_shinfo(skb)->gso_type = sk->sk_gso_type; if (likely(!(tcb->tcp_flags & TCPHDR_SYN))) { th->window = htons(tcp_select_window(sk)); tcp_ecn_send(sk, skb, th, tcp_header_size); } else { /* RFC1323: The window in SYN & SYN/ACK segments * is never scaled. */ th->window = htons(min(tp->rcv_wnd, 65535U)); } #ifdef CONFIG_TCP_MD5SIG /* Calculate the MD5 hash, as we have all we need now */ if (md5) { sk_nocaps_add(sk, NETIF_F_GSO_MASK); tp->af_specific->calc_md5_hash(opts.hash_location, md5, sk, skb); } #endif icsk->icsk_af_ops->send_check(sk, skb); if (likely(tcb->tcp_flags & TCPHDR_ACK)) tcp_event_ack_sent(sk, tcp_skb_pcount(skb)); if (skb->len != tcp_header_size) { tcp_event_data_sent(tp, sk); tp->data_segs_out += tcp_skb_pcount(skb); } if (after(tcb->end_seq, tp->snd_nxt) || tcb->seq == tcb->end_seq) TCP_ADD_STATS(sock_net(sk), TCP_MIB_OUTSEGS, tcp_skb_pcount(skb)); tp->segs_out += tcp_skb_pcount(skb); /* OK, its time to fill skb_shinfo(skb)->gso_{segs|size} */ skb_shinfo(skb)->gso_segs = tcp_skb_pcount(skb); skb_shinfo(skb)->gso_size = tcp_skb_mss(skb); /* Our usage of tstamp should remain private */ skb->tstamp = 0; /* Cleanup our debris for IP stacks */ memset(skb->cb, 0, max(sizeof(struct inet_skb_parm), sizeof(struct inet6_skb_parm))); err = icsk->icsk_af_ops->queue_xmit(sk, skb, &inet->cork.fl); if (likely(err <= 0)) return err; tcp_enter_cwr(sk); return net_xmit_eval(err); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)25930.43%1520.83%
Eric Dumazet18721.97%2129.17%
David S. Miller11513.51%1013.89%
Adam Langley617.17%11.39%
Herbert Xu475.52%11.39%
Hideaki Yoshifuji / 吉藤英明323.76%22.78%
Lawrence Brakmo273.17%11.39%
Arnaldo Carvalho de Melo263.06%56.94%
Wei Yongjun212.47%11.39%
Tom Herbert182.12%34.17%
Martin KaFai Lau111.29%11.39%
Marcelo Ricardo Leitner91.06%11.39%
Julian Anastasov91.06%11.39%
Yuchung Cheng70.82%11.39%
Pavel Emelyanov50.59%11.39%
Ilpo Järvinen40.47%11.39%
William Allen Simpson30.35%11.39%
Changli Gao30.35%11.39%
Gerrit Renker30.35%11.39%
Al Viro20.24%11.39%
Florian Westphal10.12%11.39%
Hua Zhong10.12%11.39%
Total851100.00%72100.00%

/* This routine just queues the buffer for sending. * * NOTE: probe0 timer is not checked, do not forget tcp_push_pending_frames, * otherwise socket can stall. */
static void tcp_queue_skb(struct sock *sk, struct sk_buff *skb) { struct tcp_sock *tp = tcp_sk(sk); /* Advance write_seq and place onto the write_queue. */ tp->write_seq = TCP_SKB_CB(skb)->end_seq; __skb_header_release(skb); tcp_add_write_queue_tail(sk, skb); sk->sk_wmem_queued += skb->truesize; sk_mem_charge(sk, skb->truesize); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)4465.67%541.67%
Hideo Aoki1116.42%18.33%
David S. Miller45.97%216.67%
Herbert Xu45.97%18.33%
Stephen Hemminger22.99%18.33%
Arnaldo Carvalho de Melo11.49%18.33%
Eric Dumazet11.49%18.33%
Total67100.00%12100.00%

/* Initialize TSO segments for a packet. */
static void tcp_set_skb_tso_segs(struct sk_buff *skb, unsigned int mss_now) { if (skb->len <= mss_now || skb->ip_summed == CHECKSUM_NONE) { /* Avoid the costly divide in the normal * non-TSO case. */ tcp_skb_pcount_set(skb, 1); TCP_SKB_CB(skb)->tcp_gso_size = 0; } else { tcp_skb_pcount_set(skb, DIV_ROUND_UP(skb->len, mss_now)); TCP_SKB_CB(skb)->tcp_gso_size = mss_now; } }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller3851.35%654.55%
Eric Dumazet2027.03%218.18%
Ilpo Järvinen810.81%19.09%
Herbert Xu810.81%218.18%
Total74100.00%11100.00%

/* When a modification to fackets out becomes necessary, we need to check * skb is counted to fackets_out or not. */
static void tcp_adjust_fackets_out(struct sock *sk, const struct sk_buff *skb, int decr) { struct tcp_sock *tp = tcp_sk(sk); if (!tp->sacked_out || tcp_is_reno(tp)) return; if (after(tcp_highest_sack_seq(tp), TCP_SKB_CB(skb)->seq)) tp->fackets_out -= decr; }

Contributors

PersonTokensPropCommitsCommitProp
Ilpo Järvinen6598.48%480.00%
Eric Dumazet11.52%120.00%
Total66100.00%5100.00%

/* Pcount in the middle of the write queue got changed, we need to do various * tweaks to fix counters */
static void tcp_adjust_pcount(struct sock *sk, const struct sk_buff *skb, int decr) { struct tcp_sock *tp = tcp_sk(sk); tp->packets_out -= decr; if (TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_ACKED) tp->sacked_out -= decr; if (TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_RETRANS) tp->retrans_out -= decr; if (TCP_SKB_CB(skb)->sacked & TCPCB_LOST) tp->lost_out -= decr; /* Reno case is special. Sigh... */ if (tcp_is_reno(tp) && decr > 0) tp->sacked_out -= min_t(u32, tp->sacked_out, decr); tcp_adjust_fackets_out(sk, skb, decr); if (tp->lost_skb_hint && before(TCP_SKB_CB(skb)->seq, TCP_SKB_CB(tp->lost_skb_hint)->seq) && (tcp_is_fack(tp) || (TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_ACKED))) tp->lost_cnt_hint -= decr; tcp_verify_left_out(tp); }

Contributors

PersonTokensPropCommitsCommitProp
Ilpo Järvinen17699.44%266.67%
Eric Dumazet10.56%133.33%
Total177100.00%3100.00%


static bool tcp_has_tx_tstamp(const struct sk_buff *skb) { return TCP_SKB_CB(skb)->txstamp_ack || (skb_shinfo(skb)->tx_flags & SKBTX_ANY_TSTAMP); }

Contributors

PersonTokensPropCommitsCommitProp
Soheil Hassas Yeganeh31100.00%1100.00%
Total31100.00%1100.00%


static void tcp_fragment_tstamp(struct sk_buff *skb, struct sk_buff *skb2) { struct skb_shared_info *shinfo = skb_shinfo(skb); if (unlikely(tcp_has_tx_tstamp(skb)) && !before(shinfo->tskey, TCP_SKB_CB(skb2)->seq)) { struct skb_shared_info *shinfo2 = skb_shinfo(skb2); u8 tsflags = shinfo->tx_flags & SKBTX_ANY_TSTAMP; shinfo->tx_flags &= ~tsflags; shinfo2->tx_flags |= tsflags; swap(shinfo->tskey, shinfo2->tskey); TCP_SKB_CB(skb2)->txstamp_ack = TCP_SKB_CB(skb)->txstamp_ack; TCP_SKB_CB(skb)->txstamp_ack = 0; } }

Contributors

PersonTokensPropCommitsCommitProp
Willem de Bruijn9277.31%133.33%
Martin KaFai Lau2319.33%133.33%
Soheil Hassas Yeganeh43.36%133.33%
Total119100.00%3100.00%


static void tcp_skb_fragment_eor(struct sk_buff *skb, struct sk_buff *skb2) { TCP_SKB_CB(skb2)->eor = TCP_SKB_CB(skb)->eor; TCP_SKB_CB(skb)->eor = 0; }

Contributors

PersonTokensPropCommitsCommitProp
Martin KaFai Lau39100.00%1100.00%
Total39100.00%1100.00%

/* Function to create two new TCP segments. Shrinks the given segment * to the specified size and appends a new segment with the rest of the * packet to the list. This won't be called frequently, I hope. * Remember, these are still headerless SKBs at this point. */
int tcp_fragment(struct sock *sk, struct sk_buff *skb, u32 len, unsigned int mss_now, gfp_t gfp) { struct tcp_sock *tp = tcp_sk(sk); struct sk_buff *buff; int nsize, old_factor; int nlen; u8 flags; if (WARN_ON(len > skb->len)) return -EINVAL; nsize = skb_headlen(skb) - len; if (nsize < 0) nsize = 0; if (skb_unclone(skb, gfp)) return -ENOMEM; /* Get a new skb... force flag on. */ buff = sk_stream_alloc_skb(sk, nsize, gfp, true); if (!buff) return -ENOMEM; /* We'll just try again later. */ sk->sk_wmem_queued += buff->truesize; sk_mem_charge(sk, buff->truesize); nlen = skb->len - len - nsize; buff->truesize += nlen; skb->truesize -= nlen; /* Correct the sequence numbers. */ TCP_SKB_CB(buff)->seq = TCP_SKB_CB(skb)->seq + len; TCP_SKB_CB(buff)->end_seq = TCP_SKB_CB(skb)->end_seq; TCP_SKB_CB(skb)->end_seq = TCP_SKB_CB(buff)->seq; /* PSH and FIN should only be set in the second packet. */ flags = TCP_SKB_CB(skb)->tcp_flags; TCP_SKB_CB(skb)->tcp_flags = flags & ~(TCPHDR_FIN | TCPHDR_PSH); TCP_SKB_CB(buff)->tcp_flags = flags; TCP_SKB_CB(buff)->sacked = TCP_SKB_CB(skb)->sacked; tcp_skb_fragment_eor(skb, buff); if (!skb_shinfo(skb)->nr_frags && skb->ip_summed != CHECKSUM_PARTIAL) { /* Copy and checksum data tail into the new buffer. */ buff->csum = csum_partial_copy_nocheck(skb->data + len, skb_put(buff, nsize), nsize, 0); skb_trim(skb, len); skb->csum = csum_block_sub(skb->csum, buff->csum, len); } else { skb->ip_summed = CHECKSUM_PARTIAL; skb_split(skb, buff, len); } buff->ip_summed = skb->ip_summed; buff->tstamp = skb->tstamp; tcp_fragment_tstamp(skb, buff); old_factor = tcp_skb_pcount(skb); /* Fix up tso_factor for both original and new SKB. */ tcp_set_skb_tso_segs(skb, mss_now); tcp_set_skb_tso_segs(buff, mss_now); /* Update delivered info for the new segment */ TCP_SKB_CB(buff)->tx = TCP_SKB_CB(skb)->tx; /* If this packet has been sent out already, we must * adjust the various packet counters. */ if (!before(tp->snd_nxt, TCP_SKB_CB(buff)->end_seq)) { int diff = old_factor - tcp_skb_pcount(skb) - tcp_skb_pcount(buff); if (diff) tcp_adjust_pcount(sk, skb, diff); } /* Link BUFF into the send queue. */ __skb_header_release(buff); tcp_insert_write_queue_after(skb, buff, sk); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller35374.63%721.21%
Herbert Xu428.88%721.21%
Ilpo Järvinen194.02%618.18%
Yuchung Cheng153.17%13.03%
Hideo Aoki112.33%13.03%
Willem de Bruijn71.48%13.03%
Martin KaFai Lau71.48%13.03%
Eric Dumazet71.48%412.12%
Octavian Purdila51.06%13.03%
Patrick McHardy40.85%26.06%
Changli Gao20.42%13.03%
Ian Morris10.21%13.03%
Total473100.00%33100.00%

/* This is similar to __pskb_pull_head() (it will go to core/skbuff.c * eventually). The difference is that pulled data not copied, but * immediately discarded. */
static int __pskb_trim_head(struct sk_buff *skb, int len) { struct skb_shared_info *shinfo; int i, k, eat; eat = min_t(int, len, skb_headlen(skb)); if (eat) { __skb_pull(skb, eat); len -= eat; if (!len) return 0; } eat = len; k = 0; shinfo = skb_shinfo(skb); for (i = 0; i < shinfo->nr_frags; i++) { int size = skb_frag_size(&shinfo->frags[i]); if (size <= eat) { skb_frag_unref(skb, i); eat -= size; } else { shinfo->frags[k] = shinfo->frags[i]; if (eat) { shinfo->frags[k].page_offset += eat; skb_frag_size_sub(&shinfo->frags[k], eat); eat = 0; } k++; } } shinfo->nr_frags = k; skb_reset_tail_pointer(skb); skb->data_len -= len; skb->len = skb->data_len; return len; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller12960.85%222.22%
Eric Dumazet7736.32%444.44%
Arnaldo Carvalho de Melo31.42%111.11%
Ian Campbell20.94%111.11%
Linus Torvalds10.47%111.11%
Total212100.00%9100.00%

/* Remove acked data from a packet in the transmit queue. */
int tcp_trim_head(struct sock *sk, struct sk_buff *skb, u32 len) { u32 delta_truesize; if (skb_unclone(skb, GFP_ATOMIC)) return -ENOMEM; delta_truesize = __pskb_trim_head(skb, len); TCP_SKB_CB(skb)->seq += len; skb->ip_summed = CHECKSUM_PARTIAL; if (delta_truesize) { skb->truesize -= delta_truesize; sk->sk_wmem_queued -= delta_truesize; sk_mem_uncharge(sk, delta_truesize); sock_set_flag(sk, SOCK_QUEUE_SHRUNK); } /* Any change of skb->len requires recalculation of tso factor. */ if (tcp_skb_pcount(skb) > 1) tcp_set_skb_tso_segs(skb, tcp_skb_mss(skb)); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller4338.05%323.08%
Linus Torvalds4035.40%17.69%
Eric Dumazet1412.39%17.69%
Hideo Aoki43.54%17.69%
Linus Torvalds (pre-git)43.54%215.38%
Herbert Xu32.65%215.38%
Neal Cardwell32.65%17.69%
Patrick McHardy10.88%17.69%
Pravin B Shelar10.88%17.69%
Total113100.00%13100.00%

/* Calculate MSS not accounting any TCP options. */
static inline int __tcp_mtu_to_mss(struct sock *sk, int pmtu) { const struct tcp_sock *tp = tcp_sk(sk); const struct inet_connection_sock *icsk = inet_csk(sk); int mss_now; /* Calculate base mss without TCP options: It is MMS_S - sizeof(tcphdr) of rfc1122 */ mss_now = pmtu - icsk->icsk_af_ops->net_header_len - sizeof(struct tcphdr); /* IPv6 adds a frag_hdr in case RTAX_FEATURE_ALLFRAG is set */ if (icsk->icsk_af_ops->net_frag_header_len) { const struct dst_entry *dst = __sk_dst_get(sk); if (dst && dst_allfrag(dst)) mss_now -= icsk->icsk_af_ops->net_frag_header_len; } /* Clamp it (mss_clamp does not include tcp options) */ if (mss_now > tp->rx_opt.mss_clamp) mss_now = tp->rx_opt.mss_clamp; /* Now subtract optional transport overhead */ mss_now -= icsk->icsk_ext_hdr_len; /* Then reserve room for full set of TCP options and 8 bytes of data */ if (mss_now < 48) mss_now = 48; return mss_now; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller6850.00%114.29%
Eric Dumazet4130.15%228.57%
Arnaldo Carvalho de Melo1511.03%228.57%
John Heffner64.41%114.29%
Yuchung Cheng64.41%114.29%
Total136100.00%7100.00%

/* Calculate MSS. Not accounting for SACKs here. */
int tcp_mtu_to_mss(struct sock *sk, int pmtu) { /* Subtract TCP options size, not including SACKs */ return __tcp_mtu_to_mss(sk, pmtu) - (tcp_sk(sk)->tcp_header_len - sizeof(struct tcphdr)); }

Contributors

PersonTokensPropCommitsCommitProp
Yuchung Cheng2772.97%150.00%
David S. Miller1027.03%150.00%
Total37100.00%2100.00%

/* Inverse of above */
int tcp_mss_to_mtu(struct sock *sk, int mss) { const struct tcp_sock *tp = tcp_sk(sk); const struct inet_connection_sock *icsk = inet_csk(sk); int mtu; mtu = mss + tp->tcp_header_len + icsk->icsk_ext_hdr_len + icsk->icsk_af_ops->net_header_len; /* IPv6 adds a frag_hdr in case RTAX_FEATURE_ALLFRAG is set */ if (icsk->icsk_af_ops->net_frag_header_len) { const struct dst_entry *dst = __sk_dst_get(sk); if (dst && dst_allfrag(dst)) mtu += icsk->icsk_af_ops->net_frag_header_len; } return mtu; }

Contributors

PersonTokensPropCommitsCommitProp
Eric Dumazet4141.84%250.00%
David S. Miller3636.73%125.00%
John Heffner2121.43%125.00%
Total98100.00%4100.00%

EXPORT_SYMBOL(tcp_mss_to_mtu); /* MTU probing init per socket */
void tcp_mtup_init(struct sock *sk) { struct tcp_sock *tp = tcp_sk(sk); struct inet_connection_sock *icsk = inet_csk(sk); struct net *net = sock_net(sk); icsk->icsk_mtup.enabled = net->ipv4.sysctl_tcp_mtu_probing > 1; icsk->icsk_mtup.search_high = tp->rx_opt.mss_clamp + sizeof(struct tcphdr) + icsk->icsk_af_ops->net_header_len; icsk->icsk_mtup.search_low = tcp_mss_to_mtu(sk, net->ipv4.sysctl_tcp_base_mss); icsk->icsk_mtup.probe_size = 0; if (icsk->icsk_mtup.enabled) icsk->icsk_mtup.probe_timestamp = tcp_time_stamp; }

Contributors

PersonTokensPropCommitsCommitProp
John Heffner5848.74%116.67%
Fan Du3428.57%233.33%
David S. Miller1714.29%116.67%
Arnaldo Carvalho de Melo108.40%233.33%
Total119100.00%6100.00%

EXPORT_SYMBOL(tcp_mtup_init); /* This function synchronize snd mss to current pmtu/exthdr set. tp->rx_opt.user_mss is mss set by user by TCP_MAXSEG. It does NOT counts for TCP options, but includes only bare TCP header. tp->rx_opt.mss_clamp is mss negotiated at connection setup. It is minimum of user_mss and mss received with SYN. It also does not include TCP options. inet_csk(sk)->icsk_pmtu_cookie is last pmtu, seen by this function. tp->mss_cache is current effective sending mss, including all tcp options except for SACKs. It is evaluated, taking into account current pmtu, but never exceeds tp->rx_opt.mss_clamp. NOTE1. rfc1122 clearly states that advertised MSS DOES NOT include either tcp or ip options. NOTE2. inet_csk(sk)->icsk_pmtu_cookie and tp->mss_cache are READ ONLY outside this function. --ANK (980731) */
unsigned int tcp_sync_mss(struct sock *sk, u32 pmtu) { struct tcp_sock *tp = tcp_sk(sk); struct inet_connection_sock *icsk = inet_csk(sk); int mss_now; if (icsk->icsk_mtup.search_high > pmtu) icsk->icsk_mtup.search_high = pmtu; mss_now = tcp_mtu_to_mss(sk, pmtu); mss_now = tcp_bound_to_half_wnd(tp, mss_now); /* And store cached results */ icsk->icsk_pmtu_cookie = pmtu; if (icsk->icsk_mtup.enabled) mss_now = min(mss_now, tcp_mtu_to_mss(sk, icsk->icsk_mtup.search_low)); tp->mss_cache = mss_now; return mss_now; }

Contributors

PersonTokensPropCommitsCommitProp
John Heffner9784.35%133.33%
David S. Miller1613.91%133.33%
Ilpo Järvinen21.74%133.33%
Total115100.00%3100.00%

EXPORT_SYMBOL(tcp_sync_mss); /* Compute the current effective MSS, taking SACKs and IP options, * and even PMTU discovery events into account. */
unsigned int tcp_current_mss(struct sock *sk) { const struct tcp_sock *tp = tcp_sk(sk); const struct dst_entry *dst = __sk_dst_get(sk); u32 mss_now; unsigned int header_len; struct tcp_out_options opts; struct tcp_md5sig_key *md5; mss_now = tp->mss_cache; if (dst) { u32 mtu = dst_mtu(dst); if (mtu != inet_csk(sk)->icsk_pmtu_cookie) mss_now = tcp_sync_mss(sk, mtu); } header_len = tcp_established_options(sk, NULL, &opts, &md5) + sizeof(struct tcphdr); /* The mss_cache is sized based on tp->tcp_header_len, which assumes * some common options. If this is an odd packet (because we have SACK * blocks etc) then our calculated header_len will be different, and * we have to adjust mss_now correspondingly */ if (header_len != tp->tcp_header_len) { int delta = (int) header_len - tp->tcp_header_len; mss_now -= delta; } return mss_now; }

Contributors

PersonTokensPropCommitsCommitProp
John Heffner5438.57%114.29%
Adam Langley4834.29%114.29%
David S. Miller2618.57%114.29%
Hideaki Yoshifuji / 吉藤英明53.57%114.29%
Arnaldo Carvalho de Melo42.86%114.29%
Eric Dumazet32.14%228.57%
Total140100.00%7100.00%

/* RFC2861, slow part. Adjust cwnd, after it was not full during one rto. * As additional protections, we do not touch cwnd in retransmission phases, * and if application hit its sndbuf limit recently. */
static void tcp_cwnd_application_limited(struct sock *sk) { struct tcp_sock *tp = tcp_sk(sk); if (inet_csk(sk)->icsk_ca_state == TCP_CA_Open && sk->sk_socket && !test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { /* Limited by application or receiver window. */ u32 init_win = tcp_init_cwnd(tp, __sk_dst_get(sk)); u32 win_used = max(tp->snd_cwnd_used, init_win); if (win_used < tp->snd_cwnd) { tp->snd_ssthresh = tcp_current_ssthresh(sk); tp->snd_cwnd = (tp->snd_cwnd + win_used) >> 1; } tp->snd_cwnd_used = 0; } tp->snd_cwnd_stamp = tcp_time_stamp; }

Contributors

PersonTokensPropCommitsCommitProp
Weiping Pan (潘卫平)122100.00%1100.00%
Total122100.00%1100.00%


static void tcp_cwnd_validate(struct sock *sk, bool is_cwnd_limited) { struct tcp_sock *tp = tcp_sk(sk); /* Track the maximum number of outstanding packets in each * window, and remember whether we were cwnd-limited then. */ if (!before(tp->snd_una, tp->max_packets_seq) || tp->packets_out > tp->max_packets_out) { tp->max_packets_out = tp->packets_out; tp->max_packets_seq = tp->snd_nxt; tp->is_cwnd_limited = is_cwnd_limited; } if (tcp_is_cwnd_limited(sk)) { /* Network is feed fully. */ tp->snd_cwnd_used = 0; tp->snd_cwnd_stamp = tcp_time_stamp; } else { /* Network starves. */ if (tp->packets_out > tp->snd_cwnd_used) tp->snd_cwnd_used = tp->packets_out; if (sysctl_tcp_slow_start_after_idle && (s32)(tcp_time_stamp - tp->snd_cwnd_stamp) >= inet_csk(sk)->icsk_rto) tcp_cwnd_application_limited(sk); /* The following conditions together indicate the starvation * is caused by insufficient sender buffer: * 1) just sent some data (see tcp_write_xmit) * 2) not cwnd limited (this else condition) * 3) no more data to send (null tcp_send_head ) * 4) application is hitting buffer limit (SOCK_NOSPACE) */ if (!tcp_send_head(sk) && sk->sk_socket && test_bit(SOCK_NOSPACE, &sk->sk_socket->flags) && (1 << sk->sk_state) & (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)) tcp_chrono_start(sk, TCP_CHRONO_SNDBUF_LIMITED); } }

Contributors

PersonTokensPropCommitsCommitProp
John Heffner8344.15%114.29%
Francis Yan4624.47%114.29%
Neal Cardwell3518.62%114.29%
Ilpo Järvinen126.38%228.57%
Eric Dumazet105.32%114.29%
David S. Miller21.06%114.29%
Total188100.00%7100.00%

/* Minshall's variant of the Nagle send check. */
static bool tcp_minshall_check(const struct tcp_sock *tp) { return after(tp->snd_sml, tp->snd_una) && !after(tp->snd_sml, tp->snd_nxt); }

Contributors

PersonTokensPropCommitsCommitProp
Eric Dumazet36100.00%1100.00%
Total36100.00%1100.00%

/* Update snd_sml if this skb is under mss * Note that a TSO packet might end with a sub-mss segment * The test is really : * if ((skb->len % mss) != 0) * tp->snd_sml = TCP_SKB_CB(skb)->end_seq; * But we can avoid doing the divide again given we already have * skb_pcount = skb->len / mss_now */
static void tcp_minshall_update(struct tcp_sock *tp, unsigned int mss_now, const struct sk_buff *skb) { if (skb->len < tcp_skb_pcount(skb) * mss_now) tp->snd_sml = TCP_SKB_CB(skb)->end_seq; }

Contributors

PersonTokensPropCommitsCommitProp
Eric Dumazet45100.00%1100.00%
Total45100.00%1100.00%

/* Return false, if packet can be sent now without violation Nagle's rules: * 1. It is full sized. (provided by caller in %partial bool) * 2. Or it contains FIN. (already checked by caller) * 3. Or TCP_CORK is not set, and TCP_NODELAY is set. * 4. Or TCP_CORK is not set, and all sent packets are ACKed. * With Minshall's modification: all sent small packets are ACKed. */
static bool tcp_nagle_check(bool partial, const struct tcp_sock *tp, int nonagle) { return partial && ((nonagle & TCP_NAGLE_CORK) || (!nonagle && tp->packets_out && tcp_minshall_check(tp))); }

Contributors

PersonTokensPropCommitsCommitProp
Eric Dumazet43100.00%1100.00%
Total43100.00%1100.00%

/* Return how many segs we'd like on a TSO packet, * to send one TSO packet per ms */
u32 tcp_tso_autosize(const struct sock *sk, unsigned int mss_now, int min_tso_segs) { u32 bytes, segs; bytes = min(sk->sk_pacing_rate >> 10, sk->sk_gso_max_size - 1 - MAX_TCP_HEADER); /* Goal is to send at least one packet per ms, * not one big TSO packet every 100 ms. * This preserves ACK clocking and is consistent * with tcp_tso_should_defer() heuristic. */ segs = max_t(u32, bytes / mss_now, min_tso_segs); return min_t(u32, segs, sk->sk_gso_max_segs); }

Contributors

PersonTokensPropCommitsCommitProp
Eric Dumazet6494.12%150.00%
Neal Cardwell45.88%150.00%
Total68100.00%2100.00%

EXPORT_SYMBOL(tcp_tso_autosize); /* Return the number of segments we want in the skb we are transmitting. * See if congestion control module wants to decide; otherwise, autosize. */
static u32 tcp_tso_segs(struct sock *sk, unsigned int mss_now) { const struct tcp_congestion_ops *ca_ops = inet_csk(sk)->icsk_ca_ops; u32 tso_segs = ca_ops->tso_segs_goal ? ca_ops->tso_segs_goal(sk) : 0; return tso_segs ? : tcp_tso_autosize(sk, mss_now, sysctl_tcp_min_tso_segs); }

Contributors

PersonTokensPropCommitsCommitProp
Neal Cardwell57100.00%2100.00%
Total57100.00%2100.00%

/* Returns the portion of skb which can be sent right away */
static unsigned int tcp_mss_split_point(const struct sock *sk, const struct sk_buff *skb, unsigned int mss_now, unsigned int max_segs, int nonagle) { const struct tcp_sock *tp = tcp_sk(sk); u32 partial, needed, window, max_len; window = tcp_wnd_end(tp) - TCP_SKB_CB(skb)->seq; max_len = mss_now * max_segs; if (likely(max_len <= window && skb != tcp_write_queue_tail(sk))) return max_len; needed = min(skb->len, window); if (max_len <= needed) return max_len; partial = needed % mss_now; /* If last segment is not a full MSS, check if Nagle rules allow us * to include this last segment in this skb. * Otherwise, we'll split the skb at last MSS boundary */ if (tcp_nagle_check(partial != 0, tp, nonagle)) return needed - partial; return needed; }

Contributors

PersonTokensPropCommitsCommitProp
Ilpo Järvinen5640.88%337.50%
David S. Miller3424.82%112.50%
Eric Dumazet3122.63%225.00%
Ben Hutchings85.84%112.50%
John Heffner85.84%112.50%
Total137100.00%8100.00%

/* Can at least one segment of SKB be sent right now, according to the * congestion window rules? If so, return how many segments are allowed. */
static inline unsigned int tcp_cwnd_test(const struct tcp_sock *tp, const struct sk_buff *skb) { u32 in_flight, cwnd, halfcwnd; /* Don't be strict about the congestion window for the final FIN. */ if ((TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN) && tcp_skb_pcount(skb) == 1) return 1; in_flight = tcp_packets_in_flight(tp); cwnd = tp->snd_cwnd; if (in_flight >= cwnd) return 0; /* For better scheduling, ensure we have at least * 2 GSO packets in flight. */ halfcwnd = max(cwnd >> 1, 1U); return min(halfcwnd, cwnd - in_flight); }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller5962.11%116.67%
Eric Dumazet2627.37%350.00%
John Heffner99.47%116.67%
Changli Gao11.05%116.67%
Total95100.00%6100.00%

/* Initialize TSO state of a skb. * This must be invoked the first time we consider transmitting * SKB onto the wire. */
static int tcp_init_tso_segs(struct sk_buff *skb, unsigned int mss_now) { int tso_segs = tcp_skb_pcount(skb); if (!tso_segs || (tso_segs > 1 && tcp_skb_mss(skb) != mss_now)) { tcp_set_skb_tso_segs(skb, mss_now); tso_segs = tcp_skb_pcount(skb); } return tso_segs; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller5998.33%266.67%
Herbert Xu11.67%133.33%
Total60100.00%3100.00%

/* Return true if the Nagle test allows this packet to be * sent now. */
static inline bool tcp_nagle_test(const struct tcp_sock *tp, const struct sk_buff *skb, unsigned int cur_mss, int nonagle) { /* Nagle rule does not apply to frames, which sit in the middle of the * write_queue (they have no chances to get new data). * * This is implemented in the callers, where they modify the 'nonagle' * argument based upon the location of SKB in the send queue. */ if (nonagle & TCP_NAGLE_PUSH) return true; /* Don't use the nagle rule for urgent data (or for the final FIN). */ if (tcp_urg_mode(tp) || (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN)) return true; if (!tcp_nagle_check(skb->len < cur_mss, tp, nonagle)) return true; return false; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller6176.25%112.50%
Eric Dumazet1417.50%450.00%
Ilpo Järvinen33.75%112.50%
Yuchung Cheng11.25%112.50%
Changli Gao11.25%112.50%
Total80100.00%8100.00%

/* Does at least the first segment of SKB fit into the send window? */
static bool tcp_snd_wnd_test(const struct tcp_sock *tp, const struct sk_buff *skb, unsigned int cur_mss) { u32 end_seq = TCP_SKB_CB(skb)->end_seq; if (skb->len > cur_mss) end_seq = TCP_SKB_CB(skb)->seq + cur_mss; return !after(end_seq, tcp_wnd_end(tp)); }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller4469.84%19.09%
Linus Torvalds (pre-git)812.70%654.55%
Linus Torvalds57.94%19.09%
Ilpo Järvinen34.76%19.09%
Eric Dumazet34.76%218.18%
Total63100.00%11100.00%

/* This checks if the data bearing packet SKB (usually tcp_send_head(sk)) * should be put on the wire right now. If so, it returns the number of * packets allowed by the congestion window. */
static unsigned int tcp_snd_test(const struct sock *sk, struct sk_buff *skb, unsigned int cur_mss, int nonagle) { const struct tcp_sock *tp = tcp_sk(sk); unsigned int cwnd_quota; tcp_init_tso_segs(skb, cur_mss); if (!tcp_nagle_test(tp, skb, cur_mss, nonagle)) return 0; cwnd_quota = tcp_cwnd_test(tp, skb); if (cwnd_quota && !tcp_snd_wnd_test(tp, skb, cur_mss)) cwnd_quota = 0; return cwnd_quota; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller7984.04%330.00%
Linus Torvalds (pre-git)1010.64%440.00%
Eric Dumazet22.13%110.00%
Linus Torvalds22.13%110.00%
Stephen Hemminger11.06%110.00%
Total94100.00%10100.00%

/* Test if sending is allowed right now. */
bool tcp_may_send_now(struct sock *sk) { const struct tcp_sock *tp = tcp_sk(sk); struct sk_buff *skb = tcp_send_head(sk); return skb && tcp_snd_test(sk, skb, tcp_current_mss(sk), (tcp_skb_is_last(sk, skb) ? tp->nonagle : TCP_NAGLE_PUSH)); }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller4573.77%646.15%
Ilpo Järvinen1016.39%215.38%
Linus Torvalds (pre-git)34.92%215.38%
Eric Dumazet23.28%215.38%
Herbert Xu11.64%17.69%
Total61100.00%13100.00%

/* Trim TSO SKB to LEN bytes, put the remaining data into a new packet * which is put after SKB on the list. It is very much like * tcp_fragment() except that it may make several kinds of assumptions * in order to speed up the splitting operation. In particular, we * know that all the data is in scatter-gather pages, and that the * packet has never been sent out before (and thus is not cloned). */
static int tso_fragment(struct sock *sk, struct sk_buff *skb, unsigned int len, unsigned int mss_now, gfp_t gfp) { struct sk_buff *buff; int nlen = skb->len - len; u8 flags; /* All of a TSO frame must be composed of paged data. */ if (skb->len != skb->data_len) return tcp_fragment(sk, skb, len, mss_now, gfp); buff = sk_stream_alloc_skb(sk, 0, gfp, true); if (unlikely(!buff)) return -ENOMEM; sk->sk_wmem_queued += buff->truesize; sk_mem_charge(sk, buff->truesize); buff->truesize += nlen; skb->truesize -= nlen; /* Correct the sequence numbers. */ TCP_SKB_CB(buff)->seq = TCP_SKB_CB(skb)->seq + len; TCP_SKB_CB(buff)->end_seq = TCP_SKB_CB(skb)->end_seq; TCP_SKB_CB(skb)->end_seq = TCP_SKB_CB(buff)->seq; /* PSH and FIN should only be set in the second packet. */ flags = TCP_SKB_CB(skb)->tcp_flags; TCP_SKB_CB(skb)->tcp_flags = flags & ~(TCPHDR_FIN | TCPHDR_PSH); TCP_SKB_CB(buff)->tcp_flags = flags; /* This packet was never sent out yet, so no SACK bits. */ TCP_SKB_CB(buff)->sacked = 0; tcp_skb_fragment_eor(skb, buff); buff->ip_summed = skb->ip_summed = CHECKSUM_PARTIAL; skb_split(skb, buff, len); tcp_fragment_tstamp(skb, buff); /* Fix up tso_factor for both original and new SKB. */ tcp_set_skb_tso_segs(skb, mss_now); tcp_set_skb_tso_segs(buff, mss_now); /* Link BUFF into the send queue. */ __skb_header_release(buff); tcp_insert_write_queue_after(skb, buff, sk); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
John Heffner13548.39%14.76%
David S. Miller5921.15%419.05%
Alexey Kuznetsov217.53%14.76%
Herbert Xu217.53%29.52%
Hideo Aoki113.94%14.76%
Eric Dumazet103.58%419.05%
Willem de Bruijn72.51%14.76%
Martin KaFai Lau72.51%14.76%
Changli Gao20.72%14.76%
Octavian Purdila20.72%14.76%
Pavel Emelyanov10.36%14.76%
Ian Morris10.36%14.76%
Patrick McHardy10.36%14.76%
Ilpo Järvinen10.36%14.76%
Total279100.00%21100.00%

/* Try to defer sending, if possible, in order to minimize the amount * of TSO splitting we do. View it as a kind of TSO Nagle test. * * This algorithm is from John Heffner. */
static bool tcp_tso_should_defer(struct sock *sk, struct sk_buff *skb, bool *is_cwnd_limited, u32 max_segs) { const struct inet_connection_sock *icsk = inet_csk(sk); u32 age, send_win, cong_win, limit, in_flight; struct tcp_sock *tp = tcp_sk(sk); struct skb_mstamp now; struct sk_buff *head; int win_divisor; if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN) goto send_now; if (icsk->icsk_ca_state >= TCP_CA_Recovery) goto send_now; /* Avoid bursty behavior by allowing defer * only if the last write was recent. */ if ((s32)(tcp_time_stamp - tp->lsndtime) > 0) goto send_now; in_flight = tcp_packets_in_flight(tp); BUG_ON(tcp_skb_pcount(skb) <= 1 || (tp->snd_cwnd <= in_flight)); send_win = tcp_wnd_end(tp) - TCP_SKB_CB(skb)->seq; /* From in_flight test above, we know that cwnd > in_flight. */ cong_win = (tp->snd_cwnd - in_flight) * tp->mss_cache; limit = min(send_win, cong_win); /* If a full-sized TSO skb can be sent, do it. */ if (limit >= max_segs * tp->mss_cache) goto send_now; /* Middle in queue won't get any more data, full sendable already? */ if ((skb != tcp_write_queue_tail(sk)) && (limit >= skb->len)) goto send_now; win_divisor = ACCESS_ONCE(sysctl_tcp_tso_win_divisor); if (win_divisor) { u32 chunk = min(tp->snd_wnd, tp->snd_cwnd * tp->mss_cache); /* If at least some fraction of a window is available, * just use it. */ chunk /= win_divisor; if (limit >= chunk) goto send_now; } else { /* Different approach, try not to defer past a single * ACK. Receiver should ACK every other full sized * frame, so if we have space for more than 3 frames * then send now. */ if (limit > tcp_max_tso_deferred_mss(tp) * tp->mss_cache) goto send_now; } head = tcp_write_queue_head(sk); skb_mstamp_get(&now); age = skb_mstamp_us_delta(&now, &head->skb_mstamp); /* If next ACK is likely to come too late (half srtt), do not defer */ if (age < (tp->srtt_us >> 4)) goto send_now; /* Ok, it looks like it is advisable to defer. */ if (cong_win < send_win && cong_win <= skb->len) *is_cwnd_limited = true; return true; send_now: return false; }

Contributors

PersonTokensPropCommitsCommitProp
John Heffner19656.98%213.33%
Eric Dumazet9928.78%746.67%
Ilpo Järvinen267.56%213.33%
Neal Cardwell216.10%213.33%
Changli Gao10.29%16.67%
Bendik Rönning Opstad10.29%16.67%
Total344100.00%15100.00%


static inline void tcp_mtu_check_reprobe(struct sock *sk) { struct inet_connection_sock *icsk = inet_csk(sk); struct tcp_sock *tp = tcp_sk(sk); struct net *net = sock_net(sk); u32 interval; s32 delta; interval = net->ipv4.sysctl_tcp_probe_interval; delta = tcp_time_stamp - icsk->icsk_mtup.probe_timestamp; if (unlikely(delta >= interval * HZ)) { int mss = tcp_current_mss(sk); /* Update current search range */ icsk->icsk_mtup.probe_size = 0; icsk->icsk_mtup.search_high = tp->rx_opt.mss_clamp + sizeof(struct tcphdr) + icsk->icsk_af_ops->net_header_len; icsk->icsk_mtup.search_low = tcp_mss_to_mtu(sk, mss); /* Update probe time stamp */ icsk->icsk_mtup.probe_timestamp = tcp_time_stamp; } }

Contributors

PersonTokensPropCommitsCommitProp
Fan Du142100.00%1100.00%
Total142100.00%1100.00%

/* Create a new MTU probe if we are ready. * MTU probe is regularly attempting to increase the path MTU by * deliberately sending larger packets. This discovers routing * changes resulting in larger path MTUs. * * Returns 0 if we should wait to probe (no cwnd available), * 1 if a probe was sent, * -1 otherwise */
static int tcp_mtu_probe(struct sock *sk) { struct inet_connection_sock *icsk = inet_csk(sk); struct tcp_sock *tp = tcp_sk(sk); struct sk_buff *skb, *nskb, *next; struct net *net = sock_net(sk); int probe_size; int size_needed; int copy, len; int mss_now; int interval; /* Not currently probing/verifying, * not in recovery, * have enough cwnd, and * not SACKing (the variable headers throw things off) */ if (likely(!icsk->icsk_mtup.enabled || icsk->icsk_mtup.probe_size || inet_csk(sk)->icsk_ca_state != TCP_CA_Open || tp->snd_cwnd < 11 || tp->rx_opt.num_sacks || tp->rx_opt.dsack)) return -1; /* Use binary search for probe_size between tcp_mss_base, * and current mss_clamp. if (search_high - search_low) * smaller than a threshold, backoff from probing. */ mss_now = tcp_current_mss(sk); probe_size = tcp_mtu_to_mss(sk, (icsk->icsk_mtup.search_high + icsk->icsk_mtup.search_low) >> 1); size_needed = probe_size + (tp->reordering + 1) * tp->mss_cache; interval = icsk->icsk_mtup.search_high - icsk->icsk_mtup.search_low; /* When misfortune happens, we are reprobing actively, * and then reprobe timer has expired. We stick with current * probing process by not resetting search range to its orignal. */ if (probe_size > tcp_mtu_to_mss(sk, icsk->icsk_mtup.search_high) || interval < net->ipv4.sysctl_tcp_probe_threshold) { /* Check whether enough time has elaplased for * another round of probing. */ tcp_mtu_check_reprobe(sk); return -1; } /* Have enough data in the send queue to probe? */ if (tp->write_seq - tp->snd_nxt < size_needed) return -1; if (tp->snd_wnd < size_needed) return -1; if (after(tp->snd_nxt + size_needed, tcp_wnd_end(tp))) return 0; /* Do we need to wait to drain cwnd? With none in flight, don't stall */ if (tcp_packets_in_flight(tp) + 2 > tp->snd_cwnd) { if (!tcp_packets_in_flight(tp)) return -1; else return 0; } /* We're allowed to probe. Build it now. */ nskb = sk_stream_alloc_skb(sk, probe_size, GFP_ATOMIC, false); if (!nskb) return -1; sk->sk_wmem_queued += nskb->truesize; sk_mem_charge(sk, nskb->truesize); skb = tcp_send_head(sk); TCP_SKB_CB(nskb)->seq = TCP_SKB_CB(skb)->seq; TCP_SKB_CB(nskb)->end_seq = TCP_SKB_CB(skb)->seq + probe_size; TCP_SKB_CB(nskb)->tcp_flags = TCPHDR_ACK; TCP_SKB_CB(nskb)->sacked = 0; nskb->csum = 0; nskb->ip_summed = skb->ip_summed; tcp_insert_write_queue_before(nskb, skb, sk); len = 0; tcp_for_write_queue_from_safe(skb, next, sk) { copy = min_t(int, skb->len, probe_size - len); if (nskb->ip_summed) { skb_copy_bits(skb, 0, skb_put(nskb, copy), copy); } else { __wsum csum = skb_copy_and_csum_bits(skb, 0, skb_put(nskb, copy), copy, 0); nskb->csum = csum_block_add(nskb->csum, csum, len); } if (skb->len <= copy) { /* We've eaten all the data from this skb. * Throw it away. */ TCP_SKB_CB(nskb)->tcp_flags |= TCP_SKB_CB(skb)->tcp_flags; tcp_unlink_write_queue(skb, sk); sk_wmem_free_skb(sk, skb); } else { TCP_SKB_CB(nskb)->tcp_flags |= TCP_SKB_CB(skb)->tcp_flags & ~(TCPHDR_FIN|TCPHDR_PSH); if (!skb_shinfo(skb)->nr_frags) { skb_pull(skb, copy); if (skb->ip_summed != CHECKSUM_PARTIAL) skb->csum = csum_partial(skb->data, skb->len, 0); } else { __pskb_trim_head(skb, copy); tcp_set_skb_tso_segs(skb, mss_now); } TCP_SKB_CB(skb)->seq += copy; } len += copy; if (len >= probe_size) break; } tcp_init_tso_segs(nskb, nskb->len); /* We're ready to send. If this fails, the probe will * be resegmented into mss-sized pieces by tcp_write_xmit(). */ if (!tcp_transmit_skb(sk, nskb, 1, GFP_ATOMIC)) { /* Decrement cwnd here because we are sending * effectively two packets. */ tp->snd_cwnd--; tcp_event_new_data_sent(sk, nskb); icsk->icsk_mtup.probe_size = tcp_mss_to_mtu(sk, nskb->len); tp->mtu_probe.probe_seq_start = TCP_SKB_CB(nskb)->seq; tp->mtu_probe.probe_seq_end = TCP_SKB_CB(nskb)->end_seq; return 1; } return -1; }

Contributors

PersonTokensPropCommitsCommitProp
John Heffner39553.60%25.88%
David S. Miller8611.67%823.53%
Ilpo Järvinen8211.13%926.47%
Fan Du628.41%25.88%
Alexey Kuznetsov435.83%12.94%
Eric Dumazet202.71%411.76%
Douglas Caetano dos Santos192.58%12.94%
Hideo Aoki121.63%12.94%
Ian Morris50.68%12.94%
Patrick McHardy40.54%12.94%
Thomas Graf30.41%12.94%
Changli Gao30.41%12.94%
Arnaldo Carvalho de Melo20.27%12.94%
Herbert Xu10.14%12.94%
Total737100.00%34100.00%

/* TCP Small Queues : * Control number of packets in qdisc/devices to two packets / or ~1 ms. * (These limits are doubled for retransmits) * This allows for : * - better RTT estimation and ACK scheduling * - faster recovery * - high rates * Alas, some drivers / subsystems require a fair amount * of queued bytes to ensure line rate. * One example is wifi aggregation (802.11 AMPDU) */
static bool tcp_small_queue_check(struct sock *sk, const struct sk_buff *skb, unsigned int factor) { unsigned int limit; limit = max(2 * skb->truesize, sk->sk_pacing_rate >> 10); limit = min_t(u32, limit, sysctl_tcp_limit_output_bytes); limit <<= factor; if (atomic_read(&sk->sk_wmem_alloc) > limit) { /* Always send the 1st or 2nd skb in write queue. * No need to wait for TX completion to call us back, * after softirq/tasklet schedule. * This helps when TX completions are delayed too much. */ if (skb == sk->sk_write_queue.next || skb->prev == sk->sk_write_queue.next) return false; set_bit(TSQ_THROTTLED, &sk->sk_tsq_flags); /* It is possible TX completion already happened * before we set TSQ_THROTTLED, so we must * test again the condition. */ smp_mb__after_atomic(); if (atomic_read(&sk->sk_wmem_alloc) > limit) return true; } return false; }

Contributors

PersonTokensPropCommitsCommitProp
Eric Dumazet127100.00%3100.00%
Total127100.00%3100.00%


static void tcp_chrono_set(struct tcp_sock *tp, const enum tcp_chrono new) { const u32 now = tcp_time_stamp; if (tp->chrono_type > TCP_CHRONO_UNSPEC) tp->chrono_stat[tp->chrono_type - 1] += now - tp->chrono_start; tp->chrono_start = now; tp->chrono_type = new; }

Contributors

PersonTokensPropCommitsCommitProp
Francis Yan59100.00%1100.00%
Total59100.00%1100.00%


void tcp_chrono_start(struct sock *sk, const enum tcp_chrono type) { struct tcp_sock *tp = tcp_sk(sk); /* If there are multiple conditions worthy of tracking in a * chronograph then the highest priority enum takes precedence * over the other conditions. So that if something "more interesting" * starts happening, stop the previous chrono and start a new one. */ if (type > tp->chrono_type) tcp_chrono_set(tp, type); }

Contributors

PersonTokensPropCommitsCommitProp
Francis Yan41100.00%2100.00%
Total41100.00%2100.00%


void tcp_chrono_stop(struct sock *sk, const enum tcp_chrono type) { struct tcp_sock *tp = tcp_sk(sk); /* There are multiple conditions worthy of tracking in a * chronograph, so that the highest priority enum takes * precedence over the other conditions (see tcp_chrono_start). * If a condition stops, we only stop chrono tracking if * it's the "most interesting" or current chrono we are * tracking and starts busy chrono if we have pending data. */ if (tcp_write_queue_empty(sk)) tcp_chrono_set(tp, TCP_CHRONO_UNSPEC); else if (type == tp->chrono_type) tcp_chrono_set(tp, TCP_CHRONO_BUSY); }

Contributors

PersonTokensPropCommitsCommitProp
Francis Yan56100.00%2100.00%
Total56100.00%2100.00%

/* This routine writes packets to the network. It advances the * send_head. This happens as incoming acks open up the remote * window for us. * * LARGESEND note: !tcp_urg_mode is overkill, only frames between * snd_up-64k-mss .. snd_up cannot be large. However, taking into * account rare use of URG, this is not a big flaw. * * Send at most one packet when push_one > 0. Temporarily ignore * cwnd limit to force at most one packet out when push_one == 2. * Returns true, if no segments are in flight and we have queued segments, * but cannot send anything now because of SWS or another problem. */
static bool tcp_write_xmit(struct sock *sk, unsigned int mss_now, int nonagle, int push_one, gfp_t gfp) { struct tcp_sock *tp = tcp_sk(sk); struct sk_buff *skb; unsigned int tso_segs, sent_pkts; int cwnd_quota; int result; bool is_cwnd_limited = false, is_rwnd_limited = false; u32 max_segs; sent_pkts = 0; if (!push_one) { /* Do MTU probing. */ result = tcp_mtu_probe(sk); if (!result) { return false; } else if (result > 0) { sent_pkts = 1; } } max_segs = tcp_tso_segs(sk, mss_now); while ((skb = tcp_send_head(sk))) { unsigned int limit; tso_segs = tcp_init_tso_segs(skb, mss_now); BUG_ON(!tso_segs); if (unlikely(tp->repair) && tp->repair_queue == TCP_SEND_QUEUE) { /* "skb_mstamp" is used as a start point for the retransmit timer */ skb_mstamp_get(&skb->skb_mstamp); goto repair; /* Skip network transmission */ } cwnd_quota = tcp_cwnd_test(tp, skb); if (!cwnd_quota) { if (push_one == 2) /* Force out a loss probe pkt. */ cwnd_quota = 1; else break; } if (unlikely(!tcp_snd_wnd_test(tp, skb, mss_now))) { is_rwnd_limited = true; break; } if (tso_segs == 1) { if (unlikely(!tcp_nagle_test(tp, skb, mss_now, (tcp_skb_is_last(sk, skb) ? nonagle : TCP_NAGLE_PUSH)))) break; } else { if (!push_one && tcp_tso_should_defer(sk, skb, &is_cwnd_limited, max_segs)) break; } limit = mss_now; if (tso_segs > 1 && !tcp_urg_mode(tp)) limit = tcp_mss_split_point(sk, skb, mss_now, min_t(unsigned int, cwnd_quota, max_segs), nonagle); if (skb->len > limit && unlikely(tso_fragment(sk, skb, limit, mss_now, gfp))) break; if (test_bit(TCP_TSQ_DEFERRED, &sk->sk_tsq_flags)) clear_bit(TCP_TSQ_DEFERRED, &sk->sk_tsq_flags); if (tcp_small_queue_check(sk, skb, 0)) break; if (unlikely(tcp_transmit_skb(sk, skb, 1, gfp))) break; repair: /* Advance the send_head. This one is sent out. * This call will increment packets_out. */ tcp_event_new_data_sent(sk, skb); tcp_minshall_update(tp, mss_now, skb); sent_pkts += tcp_skb_pcount(skb); if (push_one) break; } if (is_rwnd_limited) tcp_chrono_start(sk, TCP_CHRONO_RWND_LIMITED); else tcp_chrono_stop(sk, TCP_CHRONO_RWND_LIMITED); if (likely(sent_pkts)) { if (tcp_in_cwnd_reduction(sk)) tp->prr_out += sent_pkts; /* Send one loss probe per tail loss episode. */ if (push_one != 2) tcp_schedule_loss_probe(sk); is_cwnd_limited |= (tcp_packets_in_flight(tp) >= tp->snd_cwnd); tcp_cwnd_validate(sk, is_cwnd_limited); return false; } return !tp->packets_out && tcp_send_head(sk); }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller16932.69%819.51%
Eric Dumazet6312.19%1126.83%
Nandita Dukkipati5210.06%24.88%
Ilpo Järvinen356.77%49.76%
Herbert Xu346.58%24.88%
Linus Torvalds (pre-git)326.19%24.88%
John Heffner295.61%12.44%
Francis Yan295.61%12.44%
Andrey Vagin275.22%24.88%
Bendik Rönning Opstad132.51%12.44%
Neal Cardwell101.93%24.88%
Yuchung Cheng91.74%12.44%
Ben Hutchings71.35%12.44%
Alexey Kuznetsov50.97%12.44%
John Ogness20.39%12.44%
Arnaldo Carvalho de Melo10.19%12.44%
Total517100.00%41100.00%


bool tcp_schedule_loss_probe(struct sock *sk) { struct inet_connection_sock *icsk = inet_csk(sk); struct tcp_sock *tp = tcp_sk(sk); u32 timeout, tlp_time_stamp, rto_time_stamp; u32 rtt = usecs_to_jiffies(tp->srtt_us >> 3); /* No consecutive loss probes. */ if (WARN_ON(icsk->icsk_pending == ICSK_TIME_LOSS_PROBE)) { tcp_rearm_rto(sk); return false; } /* Don't do any loss probe on a Fast Open connection before 3WHS * finishes. */ if (tp->fastopen_rsk) return false; /* TLP is only scheduled when next timer event is RTO. */ if (icsk->icsk_pending != ICSK_TIME_RETRANS) return false; /* Schedule a loss probe in 2*RTT for SACK capable connections * in Open state, that are either limited by cwnd or application. */ if ((sysctl_tcp_early_retrans != 3 && sysctl_tcp_early_retrans != 4) || !tp->packets_out || !tcp_is_sack(tp) || icsk->icsk_ca_state != TCP_CA_Open) return false; if ((tp->snd_cwnd > tcp_packets_in_flight(tp)) && tcp_send_head(sk)) return false; /* Probe timeout is at least 1.5*rtt + TCP_DELACK_MAX to account * for delayed ack when there's one outstanding packet. If no RTT * sample is available then probe after TCP_TIMEOUT_INIT. */ timeout = rtt << 1 ? : TCP_TIMEOUT_INIT; if (tp->packets_out == 1) timeout = max_t(u32, timeout, (rtt + (rtt >> 1) + TCP_DELACK_MAX)); timeout = max_t(u32, timeout, msecs_to_jiffies(10)); /* If RTO is shorter, just schedule TLP in its place. */ tlp_time_stamp = tcp_time_stamp + timeout; rto_time_stamp = (u32)inet_csk(sk)->icsk_timeout; if ((s32)(tlp_time_stamp - rto_time_stamp) > 0) { s32 delta = rto_time_stamp - tcp_time_stamp; if (delta > 0) timeout = delta; } inet_csk_reset_xmit_timer(sk, ICSK_TIME_LOSS_PROBE, timeout, TCP_RTO_MAX); return true; }

Contributors

PersonTokensPropCommitsCommitProp
Nandita Dukkipati23789.43%112.50%
Yuchung Cheng145.28%225.00%
David S. Miller83.02%337.50%
Eric Dumazet62.26%225.00%
Total265100.00%8100.00%

/* Thanks to skb fast clones, we can detect if a prior transmit of * a packet is still in a qdisc or driver queue. * In this case, there is very little point doing a retransmit ! */
static bool skb_still_in_host_queue(const struct sock *sk, const struct sk_buff *skb) { if (unlikely(skb_fclone_busy(sk, skb))) { NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPSPURIOUS_RTX_HOSTQUEUES); return true; } return false; }

Contributors

PersonTokensPropCommitsCommitProp
Eric Dumazet48100.00%4100.00%
Total48100.00%4100.00%

/* When probe timeout (PTO) fires, try send a new segment if possible, else * retransmit the last segment. */
void tcp_send_loss_probe(struct sock *sk) { struct tcp_sock *tp = tcp_sk(sk); struct sk_buff *skb; int pcount; int mss = tcp_current_mss(sk); skb = tcp_send_head(sk); if (skb) { if (tcp_snd_wnd_test(tp, skb, mss)) { pcount = tp->packets_out; tcp_write_xmit(sk, mss, TCP_NAGLE_OFF, 2, GFP_ATOMIC); if (tp->packets_out > pcount) goto probe_sent; goto rearm_timer; } skb = tcp_write_queue_prev(sk, skb); } else { skb = tcp_write_queue_tail(sk); } /* At most one outstanding TLP retransmission. */ if (tp->tlp_high_seq) goto rearm_timer; /* Retransmit last segment. */ if (WARN_ON(!skb)) goto rearm_timer; if (skb_still_in_host_queue(sk, skb)) goto rearm_timer; pcount = tcp_skb_pcount(skb); if (WARN_ON(!pcount)) goto rearm_timer; if ((pcount > 1) && (skb->len > (pcount - 1) * mss)) { if (unlikely(tcp_fragment(sk, skb, (pcount - 1) * mss, mss, GFP_ATOMIC))) goto rearm_timer; skb = tcp_write_queue_next(sk, skb); } if (WARN_ON(!skb || !tcp_skb_pcount(skb))) goto rearm_timer; if (__tcp_retransmit_skb(sk, skb, 1)) goto rearm_timer; /* Record snd_nxt for loss detection. */ tp->tlp_high_seq = tp->snd_nxt; probe_sent: NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPLOSSPROBES); /* Reset s.t. tcp_rearm_rto will restart timer from now */ inet_csk(sk)->icsk_pending = 0; rearm_timer: tcp_rearm_rto(sk); }

Contributors

PersonTokensPropCommitsCommitProp
Nandita Dukkipati19766.78%225.00%
Yuchung Cheng8127.46%225.00%
Eric Dumazet155.08%337.50%
Octavian Purdila20.68%112.50%
Total295100.00%8100.00%

/* Push out any pending frames which were held back due to * TCP_CORK or attempt at coalescing tiny packets. * The socket must be locked by the caller. */
void __tcp_push_pending_frames(struct sock *sk, unsigned int cur_mss, int nonagle) { /* If we are closed, the bytes will have to remain here. * In time closedown will finish, we empty the write queue and * all will be happy. */ if (unlikely(sk->sk_state == TCP_CLOSE)) return; if (tcp_write_xmit(sk, cur_mss, nonagle, 0, sk_gfp_mask(sk, GFP_ATOMIC))) tcp_check_probe_timer(sk); }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller3360.00%233.33%
Ilpo Järvinen1730.91%233.33%
Mel Gorman47.27%116.67%
Eric Dumazet11.82%116.67%
Total55100.00%6100.00%

/* Send _single_ skb sitting at the send head. This function requires * true push pending frames to setup probe timer etc. */
void tcp_push_one(struct sock *sk, unsigned int mss_now) { struct sk_buff *skb = tcp_send_head(sk); BUG_ON(!skb || skb->len < mss_now); tcp_write_xmit(sk, mss_now, TCP_NAGLE_PUSH, 1, sk->sk_allocation); }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller3874.51%753.85%
Linus Torvalds (pre-git)1121.57%430.77%
Linus Torvalds11.96%17.69%
Ilpo Järvinen11.96%17.69%
Total51100.00%13100.00%

/* This function returns the amount that we can raise the * usable window based on the following constraints * * 1. The window can never be shrunk once it is offered (RFC 793) * 2. We limit memory per socket * * RFC 1122: * "the suggested [SWS] avoidance algorithm for the receiver is to keep * RECV.NEXT + RCV.WIN fixed until: * RCV.BUFF - RCV.USER - RCV.WINDOW >= min(1/2 RCV.BUFF, MSS)" * * i.e. don't raise the right edge of the window until you can raise * it at least MSS bytes. * * Unfortunately, the recommended algorithm breaks header prediction, * since header prediction assumes th->window stays fixed. * * Strictly speaking, keeping th->window fixed violates the receiver * side SWS prevention criteria. The problem is that under this rule * a stream of single byte packets will cause the right side of the * window to always advance by a single byte. * * Of course, if the sender implements sender side SWS prevention * then this will not be a problem. * * BSD seems to make the following compromise: * * If the free space is less than the 1/4 of the maximum * space available and the free space is less than 1/2 mss, * then set the window to 0. * [ Actually, bsd uses MSS and 1/4 of maximal _window_ ] * Otherwise, just prevent the window from shrinking * and from being larger than the largest representable value. * * This prevents incremental opening of the window in the regime * where TCP is limited by the speed of the reader side taking * data out of the TCP receive queue. It does nothing about * those cases where the window is constrained on the sender side * because the pipeline is full. * * BSD also seems to "accidentally" limit itself to windows that are a * multiple of MSS, at least until the free space gets quite small. * This would appear to be a side effect of the mbuf implementation. * Combining these two algorithms results in the observed behavior * of having a fixed window size at almost all times. * * Below we obtain similar behavior by forcing the offered window to * a multiple of the mss when it is feasible to do so. * * Note, we don't "adjust" for TIMESTAMP or SACK option bytes. * Regular options like TIMESTAMP are taken into account. */
u32 __tcp_select_window(struct sock *sk) { struct inet_connection_sock *icsk = inet_csk(sk); struct tcp_sock *tp = tcp_sk(sk); /* MSS for the peer's data. Previous versions used mss_clamp * here. I don't know if the value based on our guesses * of peer's MSS is better for the performance. It's more correct * but may be worse for the performance because of rcv_mss * fluctuations. --SAW 1998/11/1 */ int mss = icsk->icsk_ack.rcv_mss; int free_space = tcp_space(sk); int allowed_space = tcp_full_space(sk); int full_space = min_t(int, tp->window_clamp, allowed_space); int window; if (unlikely(mss > full_space)) { mss = full_space; if (mss <= 0) return 0; } if (free_space < (full_space >> 1)) { icsk->icsk_ack.quick = 0; if (tcp_under_memory_pressure(sk)) tp->rcv_ssthresh = min(tp->rcv_ssthresh, 4U * tp->advmss); /* free_space might become our new window, make sure we don't * increase it due to wscale. */ free_space = round_down(free_space, 1 << tp->rx_opt.rcv_wscale); /* if free space is less than mss estimate, or is below 1/16th * of the maximum allowed, try to move to zero-window, else * tcp_clamp_window() will grow rcv buf up to tcp_rmem[2], and * new incoming data is dropped due to memory limits. * With large window, mss test triggers way too late in order * to announce zero window in time before rmem limit kicks in. */ if (free_space < (allowed_space >> 4) || free_space < mss) return 0; } if (free_space > tp->rcv_ssthresh) free_space = tp->rcv_ssthresh; /* Don't do rounding if we are using window scaling, since the * scaled window will not line up with the MSS boundary anyway. */ window = tp->rcv_wnd; if (tp->rx_opt.rcv_wscale) { window = free_space; /* Advertise enough space so that it won't get scaled away. * Import case: prevent zero window announcement if * 1<<rcv_wscale > mss. */ if (((window >> tp->rx_opt.rcv_wscale) << tp->rx_opt.rcv_wscale) != window) window = (((window >> tp->rx_opt.rcv_wscale) + 1) << tp->rx_opt.rcv_wscale); } else { /* Get the largest window that is a nice multiple of mss. * Window clamp already applied above. * If our current window offering is within 1 mss of the * free space we just keep it. This prevents the divide * and multiply from happening most of the time. * We also don't do any window rounding when the free space * is too small. */ if (window <= free_space - mss || window > free_space) window = (free_space / mss) * mss; else if (mss == full_space && free_space > window + (full_space >> 1)) window = free_space; } return window; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)11336.81%1038.46%
John Heffner7323.78%27.69%
Florian Westphal3411.07%13.85%
Linus Torvalds3210.42%415.38%
Arnaldo Carvalho de Melo258.14%311.54%
Eric Dumazet237.49%311.54%
David S. Miller30.98%13.85%
Glauber de Oliveira Costa30.98%13.85%
Stephen Hemminger10.33%13.85%
Total307100.00%26100.00%


void tcp_skb_collapse_tstamp(struct sk_buff *skb, const struct sk_buff *next_skb) { if (unlikely(tcp_has_tx_tstamp(next_skb))) { const struct skb_shared_info *next_shinfo = skb_shinfo(next_skb); struct skb_shared_info *shinfo = skb_shinfo(skb); shinfo->tx_flags |= next_shinfo->tx_flags & SKBTX_ANY_TSTAMP; shinfo->tskey = next_shinfo->tskey; TCP_SKB_CB(skb)->txstamp_ack |= TCP_SKB_CB(next_skb)->txstamp_ack; } }

Contributors

PersonTokensPropCommitsCommitProp
Martin KaFai Lau6580.25%266.67%
Soheil Hassas Yeganeh1619.75%133.33%
Total81100.00%3100.00%

/* Collapses two adjacent SKB's during retransmission. */
static bool tcp_collapse_retrans(struct sock *sk, struct sk_buff *skb) { struct tcp_sock *tp = tcp_sk(sk); struct sk_buff *next_skb = tcp_write_queue_next(sk, skb); int skb_size, next_skb_size; skb_size = skb->len; next_skb_size = next_skb->len; BUG_ON(tcp_skb_pcount(skb) != 1 || tcp_skb_pcount(next_skb) != 1); if (next_skb_size) { if (next_skb_size <= skb_availroom(skb)) skb_copy_bits(next_skb, 0, skb_put(skb, next_skb_size), next_skb_size); else if (!skb_shift(skb, next_skb, next_skb_size)) return false; } tcp_highest_sack_combine(sk, next_skb, skb); tcp_unlink_write_queue(next_skb, sk); if (next_skb->ip_summed == CHECKSUM_PARTIAL) skb->ip_summed = CHECKSUM_PARTIAL; if (skb->ip_summed != CHECKSUM_PARTIAL) skb->csum = csum_block_add(skb->csum, next_skb->csum, skb_size); /* Update sequence range on original skb. */ TCP_SKB_CB(skb)->end_seq = TCP_SKB_CB(next_skb)->end_seq; /* Merge over control information. This moves PSH/FIN etc. over */ TCP_SKB_CB(skb)->tcp_flags |= TCP_SKB_CB(next_skb)->tcp_flags; /* All done, get rid of second SKB and account for it so * packet counting does not break. */ TCP_SKB_CB(skb)->sacked |= TCP_SKB_CB(next_skb)->sacked & TCPCB_EVER_RETRANS; TCP_SKB_CB(skb)->eor = TCP_SKB_CB(next_skb)->eor; /* changed transmit queue under us so clear hints */ tcp_clear_retrans_hints_partial(tp); if (next_skb == tp->retransmit_skb_hint) tp->retransmit_skb_hint = skb; tcp_adjust_pcount(sk, next_skb, tcp_skb_pcount(next_skb)); tcp_skb_collapse_tstamp(skb, next_skb); sk_wmem_free_skb(sk, next_skb); return true; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)10737.68%926.47%
Eric Dumazet5619.72%38.82%
David S. Miller3211.27%514.71%
Ilpo Järvinen2910.21%720.59%
Martin KaFai Lau217.39%25.88%
Linus Torvalds124.23%25.88%
Alexey Kuznetsov113.87%12.94%
Jarek Poplawski93.17%12.94%
Arnaldo Carvalho de Melo31.06%25.88%
Patrick McHardy31.06%12.94%
Hideo Aoki10.35%12.94%
Total284100.00%34100.00%

/* Check if coalescing SKBs is legal. */
static bool tcp_can_collapse(const struct sock *sk, const struct sk_buff *skb) { if (tcp_skb_pcount(skb) > 1) return false; if (skb_cloned(skb)) return false; if (skb == tcp_send_head(sk)) return false; /* Some heuristics for collapsing over SACK'd could be invented */ if (TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_ACKED) return false; return true; }

Contributors

PersonTokensPropCommitsCommitProp
Ilpo Järvinen6187.14%125.00%
Eric Dumazet912.86%375.00%
Total70100.00%4100.00%

/* Collapse packets in the retransmit queue to make to create * less packets on the wire. This is only done on retransmission. */
static void tcp_retrans_try_collapse(struct sock *sk, struct sk_buff *to, int space) { struct tcp_sock *tp = tcp_sk(sk); struct sk_buff *skb = to, *tmp; bool first = true; if (!sysctl_tcp_retrans_collapse) return; if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_SYN) return; tcp_for_write_queue_from_safe(skb, tmp, sk) { if (!tcp_can_collapse(sk, skb)) break; if (!tcp_skb_can_collapse_to(to)) break; space -= skb->len; if (first) { first = false; continue; } if (space < 0) break; if (after(TCP_SKB_CB(skb)->end_seq, tcp_wnd_end(tp))) break; if (!tcp_collapse_retrans(sk, to)) break; } }

Contributors

PersonTokensPropCommitsCommitProp
Ilpo Järvinen12686.90%116.67%
Eric Dumazet96.21%350.00%
Martin KaFai Lau96.21%116.67%
Changli Gao10.69%116.67%
Total145100.00%6100.00%

/* This retransmits one SKB. Policy decisions and retransmit queue * state updates are done by the caller. Returns non-zero if an * error occurred which prevented the send. */
int __tcp_retransmit_skb(struct sock *sk, struct sk_buff *skb, int segs) { struct inet_connection_sock *icsk = inet_csk(sk); struct tcp_sock *tp = tcp_sk(sk); unsigned int cur_mss; int diff, len, err; /* Inconclusive MTU probe */ if (icsk->icsk_mtup.probe_size) icsk->icsk_mtup.probe_size = 0; /* Do not sent more than we queued. 1/4 is reserved for possible * copying overhead: fragmentation, tunneling, mangling etc. */ if (atomic_read(&sk->sk_wmem_alloc) > min_t(u32, sk->sk_wmem_queued + (sk->sk_wmem_queued >> 2), sk->sk_sndbuf)) return -EAGAIN; if (skb_still_in_host_queue(sk, skb)) return -EBUSY; if (before(TCP_SKB_CB(skb)->seq, tp->snd_una)) { if (before(TCP_SKB_CB(skb)->end_seq, tp->snd_una)) BUG(); if (tcp_trim_head(sk, skb, tp->snd_una - TCP_SKB_CB(skb)->seq)) return -ENOMEM; } if (inet_csk(sk)->icsk_af_ops->rebuild_header(sk)) return -EHOSTUNREACH; /* Routing failure or similar. */ cur_mss = tcp_current_mss(sk); /* If receiver has shrunk his window, and skb is out of * new window, do not retransmit it. The exception is the * case, when window is shrunk to zero. In this case * our retransmit serves as a zero window probe. */ if (!before(TCP_SKB_CB(skb)->seq, tcp_wnd_end(tp)) && TCP_SKB_CB(skb)->seq != tp->snd_una) return -EAGAIN; len = cur_mss * segs; if (skb->len > len) { if (tcp_fragment(sk, skb, len, cur_mss, GFP_ATOMIC)) return -ENOMEM; /* We'll try again later. */ } else { if (skb_unclone(skb, GFP_ATOMIC)) return -ENOMEM; diff = tcp_skb_pcount(skb); tcp_set_skb_tso_segs(skb, cur_mss); diff -= tcp_skb_pcount(skb); if (diff) tcp_adjust_pcount(sk, skb, diff); if (skb->len < cur_mss) tcp_retrans_try_collapse(sk, skb, cur_mss); } /* RFC3168, section 6.1.1.1. ECN fallback */ if ((TCP_SKB_CB(skb)->tcp_flags & TCPHDR_SYN_ECN) == TCPHDR_SYN_ECN) tcp_ecn_clear_syn(sk, skb); /* Update global and local TCP statistics. */ segs = tcp_skb_pcount(skb); TCP_ADD_STATS(sock_net(sk), TCP_MIB_RETRANSSEGS, segs); if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_SYN) __NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPSYNRETRANS); tp->total_retrans += segs; /* make sure skb->data is aligned on arches that require it * and check if ack-trimming & collapsing extended the headroom * beyond what csum_start can cover. */ if (unlikely((NET_IP_ALIGN && ((unsigned long)skb->data & 3)) || skb_headroom(skb) >= 0xFFFF)) { struct sk_buff *nskb; skb_mstamp_get(&skb->skb_mstamp); nskb = __pskb_copy(skb, MAX_TCP_HEADER, GFP_ATOMIC); err = nskb ? tcp_transmit_skb(sk, nskb, 0, GFP_ATOMIC) : -ENOBUFS; } else { err = tcp_transmit_skb(sk, skb, 1, GFP_ATOMIC); } if (likely(!err)) { TCP_SKB_CB(skb)->sacked |= TCPCB_EVER_RETRANS; } else if (err != -EBUSY) { NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPRETRANSFAIL); } return err; }

Contributors

PersonTokensPropCommitsCommitProp
Eric Dumazet16230.00%720.00%
Yuchung Cheng8716.11%38.57%
Linus Torvalds (pre-git)8215.19%720.00%
Alexey Kuznetsov6011.11%25.71%
Linus Torvalds315.74%12.86%
Sridhar Samudrala264.81%12.86%
Daniel Borkmann234.26%12.86%
John Heffner234.26%12.86%
Ilpo Järvinen224.07%38.57%
Thomas Graf101.85%12.86%
David S. Miller61.11%411.43%
Arnaldo Carvalho de Melo40.74%12.86%
Octavian Purdila20.37%12.86%
Stephen Hemminger10.19%12.86%
Herbert Xu10.19%12.86%
Total540100.00%35100.00%


int tcp_retransmit_skb(struct sock *sk, struct sk_buff *skb, int segs) { struct tcp_sock *tp = tcp_sk(sk); int err = __tcp_retransmit_skb(sk, skb, segs); if (err == 0) { #if FASTRETRANS_DEBUG > 0 if (TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_RETRANS) { net_dbg_ratelimited("retrans_out leaked\n"); } #endif TCP_SKB_CB(skb)->sacked |= TCPCB_RETRANS; tp->retrans_out += tcp_skb_pcount(skb); /* Save stamp of the first retransmit. */ if (!tp->retrans_stamp) tp->retrans_stamp = tcp_skb_timestamp(skb); } if (tp->undo_retrans < 0) tp->undo_retrans = 0; tp->undo_retrans += tcp_skb_pcount(skb); return err; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)6447.76%750.00%
Yuchung Cheng5742.54%214.29%
Eric Dumazet64.48%214.29%
Herbert Xu32.24%17.14%
David S. Miller21.49%17.14%
Joe Perches21.49%17.14%
Total134100.00%14100.00%

/* This gets called after a retransmit timeout, and the initially * retransmitted data is acknowledged. It tries to continue * resending the rest of the retransmit queue, until either * we've sent it all or the congestion window limit is reached. * If doing SACK, the first ACK which comes back for a timeout * based retransmit packet might feed us FACK information again. * If so, we use it to avoid unnecessarily retransmissions. */
void tcp_xmit_retransmit_queue(struct sock *sk) { const struct inet_connection_sock *icsk = inet_csk(sk); struct tcp_sock *tp = tcp_sk(sk); struct sk_buff *skb; struct sk_buff *hole = NULL; u32 max_segs; int mib_idx; if (!tp->packets_out) return; if (tp->retransmit_skb_hint) { skb = tp->retransmit_skb_hint; } else { skb = tcp_write_queue_head(sk); } max_segs = tcp_tso_segs(sk, tcp_current_mss(sk)); tcp_for_write_queue_from(skb, sk) { __u8 sacked; int segs; if (skb == tcp_send_head(sk)) break; /* we could do better than to assign each time */ if (!hole) tp->retransmit_skb_hint = skb; segs = tp->snd_cwnd - tcp_packets_in_flight(tp); if (segs <= 0) return; sacked = TCP_SKB_CB(skb)->sacked; /* In case tcp_shift_skb_data() have aggregated large skbs, * we need to make sure not sending too bigs TSO packets */ segs = min_t(int, segs, max_segs); if (tp->retrans_out >= tp->lost_out) { break; } else if (!(sacked & TCPCB_LOST)) { if (!hole && !(sacked & (TCPCB_SACKED_RETRANS|TCPCB_SACKED_ACKED))) hole = skb; continue; } else { if (icsk->icsk_ca_state != TCP_CA_Loss) mib_idx = LINUX_MIB_TCPFASTRETRANS; else mib_idx = LINUX_MIB_TCPSLOWSTARTRETRANS; } if (sacked & (TCPCB_SACKED_ACKED|TCPCB_SACKED_RETRANS)) continue; if (tcp_small_queue_check(sk, skb, 1)) return; if (tcp_retransmit_skb(sk, skb, segs)) return; NET_ADD_STATS(sock_net(sk), mib_idx, tcp_skb_pcount(skb)); if (tcp_in_cwnd_reduction(sk)) tp->prr_out += tcp_skb_pcount(skb); if (skb == tcp_write_queue_head(sk) && icsk->icsk_pending != ICSK_TIME_REO_TIMEOUT) inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, inet_csk(sk)->icsk_rto, TCP_RTO_MAX); } }

Contributors

PersonTokensPropCommitsCommitProp
Ilpo Järvinen9127.49%725.93%
Linus Torvalds (pre-git)7723.26%27.41%
Eric Dumazet6218.73%414.81%
Stephen Hemminger257.55%13.70%
David S. Miller216.34%27.41%
Arnaldo Carvalho de Melo216.34%414.81%
Yuchung Cheng164.83%414.81%
Nandita Dukkipati154.53%13.70%
Ian Morris20.60%13.70%
Neal Cardwell10.30%13.70%
Total331100.00%27100.00%

/* We allow to exceed memory limits for FIN packets to expedite * connection tear down and (memory) recovery. * Otherwise tcp_send_fin() could be tempted to either delay FIN * or even be forced to close flow without any FIN. * In general, we want to allow one skb per socket to avoid hangs * with edge trigger epoll() */
void sk_forced_mem_schedule(struct sock *sk, int size) { int amt; if (size <= sk->sk_forward_alloc) return; amt = sk_mem_pages(size); sk->sk_forward_alloc += amt * SK_MEM_QUANTUM; sk_memory_allocated_add(sk, amt); if (mem_cgroup_sockets_enabled && sk->sk_memcg) mem_cgroup_charge_skmem(sk->sk_memcg, amt); }

Contributors

PersonTokensPropCommitsCommitProp
Eric Dumazet4875.00%250.00%
Johannes Weiner1625.00%250.00%
Total64100.00%4100.00%

/* Send a FIN. The caller locks the socket for us. * We should try to send a FIN packet really hard, but eventually give up. */
void tcp_send_fin(struct sock *sk) { struct sk_buff *skb, *tskb = tcp_write_queue_tail(sk); struct tcp_sock *tp = tcp_sk(sk); /* Optimization, tack on the FIN if we have one skb in write queue and * this skb was not yet sent, or we are under memory pressure. * Note: in the latter case, FIN packet will be sent after a timeout, * as TCP stack thinks it has already been transmitted. */ if (tskb && (tcp_send_head(sk) || tcp_under_memory_pressure(sk))) { coalesce: TCP_SKB_CB(tskb)->tcp_flags |= TCPHDR_FIN; TCP_SKB_CB(tskb)->end_seq++; tp->write_seq++; if (!tcp_send_head(sk)) { /* This means tskb was already sent. * Pretend we included the FIN on previous transmit. * We need to set tp->snd_nxt to the value it would have * if FIN had been sent. This is because retransmit path * does not change tp->snd_nxt. */ tp->snd_nxt++; return; } } else { skb = alloc_skb_fclone(MAX_TCP_HEADER, sk->sk_allocation); if (unlikely(!skb)) { if (tskb) goto coalesce; return; } skb_reserve(skb, MAX_TCP_HEADER); sk_forced_mem_schedule(sk, skb->truesize); /* FIN eats a sequence byte, write_seq advanced by tcp_queue_skb(). */ tcp_init_nondata_skb(skb, tp->write_seq, TCPHDR_ACK | TCPHDR_FIN); tcp_queue_skb(sk, skb); } __tcp_push_pending_frames(sk, tcp_current_mss(sk), TCP_NAGLE_OFF); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)7844.83%1041.67%
Eric Dumazet7643.68%520.83%
David S. Miller52.87%28.33%
Ilpo Järvinen42.30%14.17%
Changli Gao31.72%14.17%
Fengguang Wu31.72%14.17%
Stephen Hemminger21.15%14.17%
Linus Torvalds10.57%14.17%
Arnaldo Carvalho de Melo10.57%14.17%
Alexey Kuznetsov10.57%14.17%
Total174100.00%24100.00%

/* We get here when a process closes a file descriptor (either due to * an explicit close() or as a byproduct of exit()'ing) and there * was unread data in the receive queue. This behavior is recommended * by RFC 2525, section 2.17. -DaveM */
void tcp_send_active_reset(struct sock *sk, gfp_t priority) { struct sk_buff *skb; TCP_INC_STATS(sock_net(sk), TCP_MIB_OUTRSTS); /* NOTE: No TCP options attached and we never retransmit this. */ skb = alloc_skb(MAX_TCP_HEADER, priority); if (!skb) { NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPABORTFAILED); return; } /* Reserve space for headers and prepare control bits. */ skb_reserve(skb, MAX_TCP_HEADER); tcp_init_nondata_skb(skb, tcp_acceptable_seq(sk), TCPHDR_ACK | TCPHDR_RST); skb_mstamp_get(&skb->skb_mstamp); /* Send it off. */ if (tcp_transmit_skb(sk, skb, 0, priority)) NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPABORTFAILED); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)5852.73%850.00%
Ilpo Järvinen1715.45%16.25%
Pavel Emelyanov109.09%16.25%
Gao Feng109.09%16.25%
Eric Dumazet87.27%16.25%
Changli Gao21.82%16.25%
David S. Miller21.82%16.25%
Hideaki Yoshifuji / 吉藤英明21.82%16.25%
Al Viro10.91%16.25%
Total110100.00%16100.00%

/* Send a crossed SYN-ACK during socket establishment. * WARNING: This routine must only be called when we have already sent * a SYN packet that crossed the incoming SYN that caused this routine * to get called. If this assumption fails then the initial rcv_wnd * and rcv_wscale values will not be correct. */
int tcp_send_synack(struct sock *sk) { struct sk_buff *skb; skb = tcp_write_queue_head(sk); if (!skb || !(TCP_SKB_CB(skb)->tcp_flags & TCPHDR_SYN)) { pr_debug("%s: wrong queue state\n", __func__); return -EFAULT; } if (!(TCP_SKB_CB(skb)->tcp_flags & TCPHDR_ACK)) { if (skb_cloned(skb)) { struct sk_buff *nskb = skb_copy(skb, GFP_ATOMIC); if (!nskb) return -ENOMEM; tcp_unlink_write_queue(skb, sk); __skb_header_release(nskb); __tcp_add_write_queue_head(sk, nskb); sk_wmem_free_skb(sk, skb); sk->sk_wmem_queued += nskb->truesize; sk_mem_charge(sk, nskb->truesize); skb = nskb; } TCP_SKB_CB(skb)->tcp_flags |= TCPHDR_ACK; tcp_ecn_send_synack(sk, skb); } return tcp_transmit_skb(sk, skb, 1, GFP_ATOMIC); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)13879.77%947.37%
Hideo Aoki126.94%15.26%
David S. Miller52.89%210.53%
Eric Dumazet42.31%210.53%
Joe Perches42.31%15.26%
Herbert Xu42.31%15.26%
Changli Gao31.73%15.26%
Ian Morris21.16%15.26%
Florian Westphal10.58%15.26%
Total173100.00%19100.00%

/** * tcp_make_synack - Prepare a SYN-ACK. * sk: listener socket * dst: dst entry attached to the SYNACK * req: request_sock pointer * * Allocate one skb and build a SYNACK packet. * @dst is consumed : Caller should not use it again. */
struct sk_buff *tcp_make_synack(const struct sock *sk, struct dst_entry *dst, struct request_sock *req, struct tcp_fastopen_cookie *foc, enum tcp_synack_type synack_type) { struct inet_request_sock *ireq = inet_rsk(req); const struct tcp_sock *tp = tcp_sk(sk); struct tcp_md5sig_key *md5 = NULL; struct tcp_out_options opts; struct sk_buff *skb; int tcp_header_size; struct tcphdr *th; int mss; skb = alloc_skb(MAX_TCP_HEADER, GFP_ATOMIC); if (unlikely(!skb)) { dst_release(dst); return NULL; } /* Reserve space for headers. */ skb_reserve(skb, MAX_TCP_HEADER); switch (synack_type) { case TCP_SYNACK_NORMAL: skb_set_owner_w(skb, req_to_sk(req)); break; case TCP_SYNACK_COOKIE: /* Under synflood, we do not attach skb to a socket, * to avoid false sharing. */ break; case TCP_SYNACK_FASTOPEN: /* sk is a const pointer, because we want to express multiple * cpu might call us concurrently. * sk->sk_wmem_alloc in an atomic, we can promote to rw. */ skb_set_owner_w(skb, (struct sock *)sk); break; } skb_dst_set(skb, dst); mss = tcp_mss_clamp(tp, dst_metric_advmss(dst)); memset(&opts, 0, sizeof(opts)); #ifdef CONFIG_SYN_COOKIES if (unlikely(req->cookie_ts)) skb->skb_mstamp.stamp_jiffies = cookie_init_timestamp(req); else #endif skb_mstamp_get(&skb->skb_mstamp); #ifdef CONFIG_TCP_MD5SIG rcu_read_lock(); md5 = tcp_rsk(req)->af_specific->req_md5_lookup(sk, req_to_sk(req)); #endif skb_set_hash(skb, tcp_rsk(req)->txhash, PKT_HASH_TYPE_L4); tcp_header_size = tcp_synack_options(req, mss, skb, &opts, md5, foc) + sizeof(*th); skb_push(skb, tcp_header_size); skb_reset_transport_header(skb); th = (struct tcphdr *)skb->data; memset(th, 0, sizeof(struct tcphdr)); th->syn = 1; th->ack = 1; tcp_ecn_make_synack(req, th); th->source = htons(ireq->ir_num); th->dest = ireq->ir_rmt_port; /* Setting of flags are superfluous here for callers (and ECE is * not even correctly set) */ tcp_init_nondata_skb(skb, tcp_rsk(req)->snt_isn, TCPHDR_SYN | TCPHDR_ACK); th->seq = htonl(TCP_SKB_CB(skb)->seq); /* XXX data is queued and acked as is. No buffer/window check */ th->ack_seq = htonl(tcp_rsk(req)->rcv_nxt); /* RFC1323: The window in SYN & SYN/ACK segments is never scaled. */ th->window = htons(min(req->rsk_rcv_wnd, 65535U)); tcp_options_write((__be32 *)(th + 1), NULL, &opts); th->doff = (tcp_header_size >> 2); __TCP_INC_STATS(sock_net(sk), TCP_MIB_OUTSEGS); #ifdef CONFIG_TCP_MD5SIG /* Okay, we have all we need - do the md5 hash if needed */ if (md5) tcp_rsk(req)->af_specific->calc_md5_hash(opts.hash_location, md5, req_to_sk(req), skb); rcu_read_unlock(); #endif /* Do not fool tcpdump (if any), clean our debris */ skb->tstamp = 0; return skb; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)18235.76%815.69%
Eric Dumazet15831.04%1835.29%
Hideaki Yoshifuji / 吉藤英明336.48%23.92%
Adam Langley326.29%11.96%
Arnaldo Carvalho de Melo285.50%47.84%
Florian Westphal244.72%23.92%
Ilpo Järvinen101.96%23.92%
Tom Quetchenbach91.77%11.96%
William Allen Simpson81.57%35.88%
Jerry Chu61.18%11.96%
David S. Miller50.98%35.88%
Pavel Emelyanov50.98%11.96%
John Dykstra40.79%11.96%
Changli Gao20.39%11.96%
Al Viro10.20%11.96%
Herbert Xu10.20%11.96%
KOVACS Krisztian10.20%11.96%
Total509100.00%51100.00%

EXPORT_SYMBOL(tcp_make_synack);
static void tcp_ca_dst_init(struct sock *sk, const struct dst_entry *dst) { struct inet_connection_sock *icsk = inet_csk(sk); const struct tcp_congestion_ops *ca; u32 ca_key = dst_metric(dst, RTAX_CC_ALGO); if (ca_key == TCP_CA_UNSPEC) return; rcu_read_lock(); ca = tcp_ca_find_key(ca_key); if (likely(ca && try_module_get(ca->owner))) { module_put(icsk->icsk_ca_ops->owner); icsk->icsk_ca_dst_locked = tcp_ca_dst_locked(dst); icsk->icsk_ca_ops = ca; } rcu_read_unlock(); }

Contributors

PersonTokensPropCommitsCommitProp
Daniel Borkmann103100.00%1100.00%
Total103100.00%1100.00%

/* Do all connect socket setups that can be done AF independent. */
static void tcp_connect_init(struct sock *sk) { const struct dst_entry *dst = __sk_dst_get(sk); struct tcp_sock *tp = tcp_sk(sk); __u8 rcv_wscale; /* We'll fix this up when we get a response from the other end. * See tcp_input.c:tcp_rcv_state_process case TCP_SYN_SENT. */ tp->tcp_header_len = sizeof(struct tcphdr) + (sysctl_tcp_timestamps ? TCPOLEN_TSTAMP_ALIGNED : 0); #ifdef CONFIG_TCP_MD5SIG if (tp->af_specific->md5_lookup(sk, sk)) tp->tcp_header_len += TCPOLEN_MD5SIG_ALIGNED; #endif /* If user gave his TCP_MAXSEG, record it to clamp */ if (tp->rx_opt.user_mss) tp->rx_opt.mss_clamp = tp->rx_opt.user_mss; tp->max_window = 0; tcp_mtup_init(sk); tcp_sync_mss(sk, dst_mtu(dst)); tcp_ca_dst_init(sk, dst); if (!tp->window_clamp) tp->window_clamp = dst_metric(dst, RTAX_WINDOW); tp->advmss = tcp_mss_clamp(tp, dst_metric_advmss(dst)); tcp_initialize_rcv_mss(sk); /* limit the window selection if the user enforce a smaller rx buffer */ if (sk->sk_userlocks & SOCK_RCVBUF_LOCK && (tp->window_clamp > tcp_full_space(sk) || tp->window_clamp == 0)) tp->window_clamp = tcp_full_space(sk); tcp_select_initial_window(tcp_full_space(sk), tp->advmss - (tp->rx_opt.ts_recent_stamp ? tp->tcp_header_len - sizeof(struct tcphdr) : 0), &tp->rcv_wnd, &tp->window_clamp, sysctl_tcp_window_scaling, &rcv_wscale, dst_metric(dst, RTAX_INITRWND)); tp->rx_opt.rcv_wscale = rcv_wscale; tp->rcv_ssthresh = tp->rcv_wnd; sk->sk_err = 0; sock_reset_flag(sk, SOCK_DONE); tp->snd_wnd = 0; tcp_init_wl(tp, 0); tp->snd_una = tp->write_seq; tp->snd_sml = tp->write_seq; tp->snd_up = tp->write_seq; tp->snd_nxt = tp->write_seq; if (likely(!tp->repair)) tp->rcv_nxt = 0; else tp->rcv_tstamp = tcp_time_stamp; tp->rcv_wup = tp->rcv_nxt; tp->copied_seq = tp->rcv_nxt; inet_csk(sk)->icsk_rto = TCP_TIMEOUT_INIT; inet_csk(sk)->icsk_retransmits = 0; tcp_clear_retrans(tp); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)21254.50%1130.56%
Hagen Paul Pfeifer359.00%12.78%
Arnaldo Carvalho de Melo256.43%513.89%
Hideaki Yoshifuji / 吉藤英明246.17%12.78%
Pavel Emelyanov246.17%25.56%
Alexey Kuznetsov123.08%25.56%
Thomas Graf82.06%12.78%
Ilpo Järvinen82.06%12.78%
Andrey Vagin71.80%12.78%
Daniel Borkmann71.80%12.78%
Laurent Chavey71.80%12.78%
Eric Dumazet61.54%25.56%
John Heffner51.29%12.78%
David S. Miller41.03%25.56%
James Morris20.51%12.78%
Herbert Xu10.26%12.78%
Stephen Hemminger10.26%12.78%
Tom Quetchenbach10.26%12.78%
Total389100.00%36100.00%


static void tcp_connect_queue_skb(struct sock *sk, struct sk_buff *skb) { struct tcp_sock *tp = tcp_sk(sk); struct tcp_skb_cb *tcb = TCP_SKB_CB(skb); tcb->end_seq += skb->len; __skb_header_release(skb); __tcp_add_write_queue_tail(sk, skb); sk->sk_wmem_queued += skb->truesize; sk_mem_charge(sk, skb->truesize); tp->write_seq = tcb->end_seq; tp->packets_out += tcp_skb_pcount(skb); }

Contributors

PersonTokensPropCommitsCommitProp
Yuchung Cheng3235.56%15.88%
Linus Torvalds (pre-git)2022.22%741.18%
Alexey Kuznetsov1516.67%15.88%
Hideo Aoki1011.11%15.88%
Herbert Xu66.67%211.76%
David S. Miller55.56%317.65%
Eric Dumazet11.11%15.88%
Arnaldo Carvalho de Melo11.11%15.88%
Total90100.00%17100.00%

/* Build and send a SYN with data and (cached) Fast Open cookie. However, * queue a data-only packet after the regular SYN, such that regular SYNs * are retransmitted on timeouts. Also if the remote SYN-ACK acknowledges * only the SYN sequence, the data are retransmitted in the first ACK. * If cookie is not cached or other error occurs, falls back to send a * regular SYN with Fast Open cookie request option. */
static int tcp_send_syn_data(struct sock *sk, struct sk_buff *syn) { struct tcp_sock *tp = tcp_sk(sk); struct tcp_fastopen_request *fo = tp->fastopen_req; int space, err = 0; struct sk_buff *syn_data; tp->rx_opt.mss_clamp = tp->advmss; /* If MSS is not cached */ if (!tcp_fastopen_cookie_check(sk, &tp->rx_opt.mss_clamp, &fo->cookie)) goto fallback; /* MSS for SYN-data is based on cached MSS and bounded by PMTU and * user-MSS. Reserve maximum option space for middleboxes that add * private TCP options. The cost is reduced data space in SYN :( */ tp->rx_opt.mss_clamp = tcp_mss_clamp(tp, tp->rx_opt.mss_clamp); space = __tcp_mtu_to_mss(sk, inet_csk(sk)->icsk_pmtu_cookie) - MAX_TCP_OPTION_SPACE; space = min_t(size_t, space, fo->size); /* limit to order-0 allocations */ space = min_t(size_t, space, SKB_MAX_HEAD(MAX_TCP_HEADER)); syn_data = sk_stream_alloc_skb(sk, space, sk->sk_allocation, false); if (!syn_data) goto fallback; syn_data->ip_summed = CHECKSUM_PARTIAL; memcpy(syn_data->cb, syn->cb, sizeof(syn->cb)); if (space) { int copied = copy_from_iter(skb_put(syn_data, space), space, &fo->data->msg_iter); if (unlikely(!copied)) { kfree_skb(syn_data); goto fallback; } if (copied != space) { skb_trim(syn_data, copied); space = copied; } } /* No more data pending in inet_wait_for_connect() */ if (space == fo->size) fo->data = NULL; fo->copied = space; tcp_connect_queue_skb(sk, syn_data); if (syn_data->len) tcp_chrono_start(sk, TCP_CHRONO_BUSY); err = tcp_transmit_skb(sk, syn_data, 1, sk->sk_allocation); syn->skb_mstamp = syn_data->skb_mstamp; /* Now full SYN+DATA was cloned and sent (or not), * remove the SYN from the original skb (syn_data) * we keep in write queue in case of a retransmit, as we * also have the SYN packet (with no data) in the same queue. */ TCP_SKB_CB(syn_data)->seq++; TCP_SKB_CB(syn_data)->tcp_flags = TCPHDR_ACK | TCPHDR_PSH; if (!err) { tp->syn_data = (fo->copied > 0); NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPORIGDATASENT); goto done; } fallback: /* Send a regular SYN with Fast Open cookie request option */ if (fo->cookie.len > 0) fo->cookie.len = 0; err = tcp_transmit_skb(sk, syn, 1, sk->sk_allocation); if (err) tp->syn_fastopen = 0; done: fo->cookie.len = -1; /* Exclude Fast Open option for SYN retries */ return err; }

Contributors

PersonTokensPropCommitsCommitProp
Yuchung Cheng25659.26%531.25%
Eric Dumazet12729.40%637.50%
Al Viro317.18%212.50%
Francis Yan133.01%16.25%
Wei Wang40.93%16.25%
Eric Paris10.23%16.25%
Total432100.00%16100.00%

/* Build a SYN and send it off. */
int tcp_connect(struct sock *sk) { struct tcp_sock *tp = tcp_sk(sk); struct sk_buff *buff; int err; tcp_connect_init(sk); if (unlikely(tp->repair)) { tcp_finish_connect(sk, NULL); return 0; } buff = sk_stream_alloc_skb(sk, 0, sk->sk_allocation, true); if (unlikely(!buff)) return -ENOBUFS; tcp_init_nondata_skb(buff, tp->write_seq++, TCPHDR_SYN); tp->retrans_stamp = tcp_time_stamp; tcp_connect_queue_skb(sk, buff); tcp_ecn_send_syn(sk, buff); /* Send off SYN; include data in Fast Open. */ err = tp->fastopen_req ? tcp_send_syn_data(sk, buff) : tcp_transmit_skb(sk, buff, 1, sk->sk_allocation); if (err == -ECONNREFUSED) return err; /* We change tp->snd_nxt after the tcp_transmit_skb() call * in order to make this packet get counted in tcpOutSegs. */ tp->snd_nxt = tp->write_seq; tp->pushed_seq = tp->write_seq; TCP_INC_STATS(sock_net(sk), TCP_MIB_ACTIVEOPENS); /* Timer for repeating the SYN until an answer. */ inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, inet_csk(sk)->icsk_rto, TCP_RTO_MAX); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Yuchung Cheng9749.24%15.26%
Linus Torvalds (pre-git)2110.66%526.32%
Andrey Vagin2110.66%15.26%
Wei Yongjun178.63%15.26%
Eric Paris105.08%15.26%
Arnaldo Carvalho de Melo94.57%210.53%
Eric Dumazet73.55%210.53%
Pavel Emelyanov52.54%15.26%
Fengguang Wu31.52%15.26%
Linus Torvalds31.52%15.26%
David S. Miller21.02%15.26%
Hideaki Yoshifuji / 吉藤英明10.51%15.26%
Florian Westphal10.51%15.26%
Total197100.00%19100.00%

EXPORT_SYMBOL(tcp_connect); /* Send out a delayed ack, the caller does the policy checking * to see if we should even be here. See tcp_input.c:tcp_ack_snd_check() * for details. */
void tcp_send_delayed_ack(struct sock *sk) { struct inet_connection_sock *icsk = inet_csk(sk); int ato = icsk->icsk_ack.ato; unsigned long timeout; tcp_ca_event(sk, CA_EVENT_DELAYED_ACK); if (ato > TCP_DELACK_MIN) { const struct tcp_sock *tp = tcp_sk(sk); int max_ato = HZ / 2; if (icsk->icsk_ack.pingpong || (icsk->icsk_ack.pending & ICSK_ACK_PUSHED)) max_ato = TCP_DELACK_MAX; /* Slow path, intersegment interval is "high". */ /* If some rtt estimate is known, use it to bound delayed ack. * Do not use inet_csk(sk)->icsk_rto here, use results of rtt measurements * directly. */ if (tp->srtt_us) { int rtt = max_t(int, usecs_to_jiffies(tp->srtt_us >> 3), TCP_DELACK_MIN); if (rtt < max_ato) max_ato = rtt; } ato = min(ato, max_ato); } /* Stay within the limit we were given */ timeout = jiffies + ato; /* Use new timeout only if there wasn't a older one earlier. */ if (icsk->icsk_ack.pending & ICSK_ACK_TIMER) { /* If delack timer was blocked or is about to expire, * send ACK now. */ if (icsk->icsk_ack.blocked || time_before_eq(icsk->icsk_ack.timeout, jiffies + (ato >> 2))) { tcp_send_ack(sk); return; } if (!time_before(timeout, icsk->icsk_ack.timeout)) timeout = icsk->icsk_ack.timeout; } icsk->icsk_ack.pending |= ICSK_ACK_SCHED | ICSK_ACK_TIMER; icsk->icsk_ack.timeout = timeout; sk_reset_timer(sk, &icsk->icsk_delack_timer, timeout); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)17672.73%1571.43%
Arnaldo Carvalho de Melo4418.18%29.52%
Eric Dumazet83.31%14.76%
Florian Westphal72.89%14.76%
Linus Torvalds52.07%14.76%
David S. Miller20.83%14.76%
Total242100.00%21100.00%

/* This routine sends an ack and also updates the window. */
void tcp_send_ack(struct sock *sk) { struct sk_buff *buff; /* If we have been reset, we may not send again. */ if (sk->sk_state == TCP_CLOSE) return; tcp_ca_event(sk, CA_EVENT_NON_DELAYED_ACK); /* We are not putting this on the write queue, so * tcp_transmit_skb() will set the ownership to this * sock. */ buff = alloc_skb(MAX_TCP_HEADER, sk_gfp_mask(sk, GFP_ATOMIC | __GFP_NOWARN)); if (unlikely(!buff)) { inet_csk_schedule_ack(sk); inet_csk(sk)->icsk_ack.ato = TCP_ATO_MIN; inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK, TCP_DELACK_MAX, TCP_RTO_MAX); return; } /* Reserve space for headers and prepare control bits. */ skb_reserve(buff, MAX_TCP_HEADER); tcp_init_nondata_skb(buff, tcp_acceptable_seq(sk), TCPHDR_ACK); /* We do not want pure acks influencing TCP Small Queues or fq/pacing * too much. * SKB_TRUESIZE(max(1 .. 66, MAX_TCP_HEADER)) is unfortunately ~784 */ skb_set_tcp_pure_ack(buff); /* Send it off, this clears delayed acks for us. */ skb_mstamp_get(&buff->skb_mstamp); tcp_transmit_skb(sk, buff, 0, (__force gfp_t)0); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)7454.01%1144.00%
Eric Dumazet2115.33%416.00%
Ilpo Järvinen139.49%28.00%
Arnaldo Carvalho de Melo128.76%312.00%
Florian Westphal75.11%14.00%
Mel Gorman53.65%14.00%
David S. Miller32.19%14.00%
Changli Gao10.73%14.00%
Ian Morris10.73%14.00%
Total137100.00%25100.00%

EXPORT_SYMBOL_GPL(tcp_send_ack); /* This routine sends a packet with an out of date sequence * number. It assumes the other end will try to ack it. * * Question: what should we make while urgent mode? * 4.4BSD forces sending single byte of data. We cannot send * out of window data, because we have SND.NXT==SND.MAX... * * Current solution: to send TWO zero-length segments in urgent mode: * one is with SEG.SEQ=SND.UNA to deliver urgent pointer, another is * out-of-date with SND.UNA-1 to probe window. */
static int tcp_xmit_probe_skb(struct sock *sk, int urgent, int mib) { struct tcp_sock *tp = tcp_sk(sk); struct sk_buff *skb; /* We don't queue it, tcp_transmit_skb() sets ownership. */ skb = alloc_skb(MAX_TCP_HEADER, sk_gfp_mask(sk, GFP_ATOMIC | __GFP_NOWARN)); if (!skb) return -1; /* Reserve space for headers and set control bits. */ skb_reserve(skb, MAX_TCP_HEADER); /* Use a previous sequence. This should cause the other * end to send an ack. Don't queue or clone SKB, just * send it. */ tcp_init_nondata_skb(skb, tp->snd_una - !urgent, TCPHDR_ACK); skb_mstamp_get(&skb->skb_mstamp); NET_INC_STATS(sock_net(sk), mib); return tcp_transmit_skb(sk, skb, 0, (__force gfp_t)0); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)7262.61%840.00%
Eric Dumazet2420.87%315.00%
David S. Miller65.22%210.00%
Ilpo Järvinen54.35%210.00%
Mel Gorman43.48%15.00%
Renato Westphal10.87%15.00%
Ian Morris10.87%15.00%
Changli Gao10.87%15.00%
Arnaldo Carvalho de Melo10.87%15.00%
Total115100.00%20100.00%


void tcp_send_window_probe(struct sock *sk) { if (sk->sk_state == TCP_ESTABLISHED) { tcp_sk(sk)->snd_wl1 = tcp_sk(sk)->rcv_nxt - 1; tcp_xmit_probe_skb(sk, 0, LINUX_MIB_TCPWINPROBE); } }

Contributors

PersonTokensPropCommitsCommitProp
Pavel Emelyanov4395.56%150.00%
Eric Dumazet24.44%150.00%
Total45100.00%2100.00%

/* Initiate keepalive or window probe from timer. */
int tcp_write_wakeup(struct sock *sk, int mib) { struct tcp_sock *tp = tcp_sk(sk); struct sk_buff *skb; if (sk->sk_state == TCP_CLOSE) return -1; skb = tcp_send_head(sk); if (skb && before(TCP_SKB_CB(skb)->seq, tcp_wnd_end(tp))) { int err; unsigned int mss = tcp_current_mss(sk); unsigned int seg_size = tcp_wnd_end(tp) - TCP_SKB_CB(skb)->seq; if (before(tp->pushed_seq, TCP_SKB_CB(skb)->end_seq)) tp->pushed_seq = TCP_SKB_CB(skb)->end_seq; /* We are probing the opening of a window * but the window size is != 0 * must have been a result SWS avoidance ( sender ) */ if (seg_size < TCP_SKB_CB(skb)->end_seq - TCP_SKB_CB(skb)->seq || skb->len > mss) { seg_size = min(seg_size, mss); TCP_SKB_CB(skb)->tcp_flags |= TCPHDR_PSH; if (tcp_fragment(sk, skb, seg_size, mss, GFP_ATOMIC)) return -1; } else if (!tcp_skb_pcount(skb)) tcp_set_skb_tso_segs(skb, mss); TCP_SKB_CB(skb)->tcp_flags |= TCPHDR_PSH; err = tcp_transmit_skb(sk, skb, 1, GFP_ATOMIC); if (!err) tcp_event_new_data_sent(sk, skb); return err; } else { if (between(tp->snd_up, tp->snd_una + 1, tp->snd_una + 0xFFFF)) tcp_xmit_probe_skb(sk, 1, mib); return tcp_xmit_probe_skb(sk, 0, mib); } }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)21575.97%931.03%
David S. Miller2910.25%827.59%
Ilpo Järvinen196.71%413.79%
Eric Dumazet93.18%26.90%
Ian Morris41.41%13.45%
Arnaldo Carvalho de Melo20.71%26.90%
Changli Gao20.71%13.45%
Octavian Purdila20.71%13.45%
Linus Torvalds10.35%13.45%
Total283100.00%29100.00%

/* A window probe timeout has occurred. If window is not closed send * a partial packet else a zero probe. */
void tcp_send_probe0(struct sock *sk) { struct inet_connection_sock *icsk = inet_csk(sk); struct tcp_sock *tp = tcp_sk(sk); struct net *net = sock_net(sk); unsigned long probe_max; int err; err = tcp_write_wakeup(sk, LINUX_MIB_TCPWINPROBE); if (tp->packets_out || !tcp_send_head(sk)) { /* Cancel probe timer, if it is not required. */ icsk->icsk_probes_out = 0; icsk->icsk_backoff = 0; return; } if (err <= 0) { if (icsk->icsk_backoff < net->ipv4.sysctl_tcp_retries2) icsk->icsk_backoff++; icsk->icsk_probes_out++; probe_max = TCP_RTO_MAX; } else { /* If packet was not sent due to local congestion, * do not backoff and do not remember icsk_probes_out. * Let local senders to fight for local resources. * * Use accumulated backoff yet. */ if (!icsk->icsk_probes_out) icsk->icsk_probes_out = 1; probe_max = TCP_RESOURCE_PROBE_INTERVAL; } inet_csk_reset_xmit_timer(sk, ICSK_TIME_PROBE0, tcp_probe0_when(sk, probe_max), TCP_RTO_MAX); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)8152.26%320.00%
Arnaldo Carvalho de Melo3220.65%533.33%
Eric Dumazet1610.32%320.00%
Nikolay Borisov149.03%16.67%
David S. Miller127.74%320.00%
Total155100.00%15100.00%


int tcp_rtx_synack(const struct sock *sk, struct request_sock *req) { const struct tcp_request_sock_ops *af_ops = tcp_rsk(req)->af_specific; struct flowi fl; int res; tcp_rsk(req)->txhash = net_tx_rndhash(); res = af_ops->send_synack(sk, NULL, &fl, req, NULL, TCP_SYNACK_NORMAL); if (!res) { __TCP_INC_STATS(sock_net(sk), TCP_MIB_RETRANSSEGS); __NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPSYNRETRANS); if (unlikely(tcp_passive_fastopen(sk))) tcp_sk(sk)->total_retrans++; } return res; }

Contributors

PersonTokensPropCommitsCommitProp
Octavian Purdila8171.05%112.50%
Yuchung Cheng1815.79%112.50%
Eric Dumazet1513.16%675.00%
Total114100.00%8100.00%

EXPORT_SYMBOL(tcp_rtx_synack);

Overall Contributors

PersonTokensPropCommitsCommitProp
Eric Dumazet273517.01%10622.70%
Linus Torvalds (pre-git)249315.50%469.85%
David S. Miller187311.65%449.42%
Ilpo Järvinen13758.55%5311.35%
John Heffner11957.43%61.28%
Yuchung Cheng9746.06%245.14%
Adam Langley8275.14%10.21%
Nandita Dukkipati5243.26%40.86%
Stephen Hemminger4042.51%91.93%
Arnaldo Carvalho de Melo3232.01%183.85%
Francis Yan2441.52%40.86%
Fan Du2381.48%30.64%
Daniel Borkmann2321.44%40.86%
Florian Westphal1901.18%71.50%
Martin KaFai Lau1821.13%61.28%
Herbert Xu1781.11%194.07%
Alexey Kuznetsov1731.08%61.28%
Neal Cardwell1621.01%81.71%
Hideaki Yoshifuji / 吉藤英明1410.88%40.86%
Linus Torvalds1370.85%61.28%
Weiping Pan (潘卫平)1240.77%20.43%
William Allen Simpson1160.72%30.64%
Willem de Bruijn1060.66%10.21%
Daniel Lee1050.65%20.43%
Octavian Purdila990.62%20.43%
Pavel Emelyanov930.58%51.07%
Hideo Aoki720.45%10.21%
Andrey Vagin630.39%51.07%
Soheil Hassas Yeganeh620.39%20.43%
Wei Yongjun380.24%10.21%
Al Viro360.22%40.86%
Hagen Paul Pfeifer350.22%10.21%
Changli Gao340.21%10.21%
Cui, Cheng320.20%10.21%
Lawrence Brakmo270.17%10.21%
Andi Kleen260.16%20.43%
Sridhar Samudrala260.16%10.21%
Patrick McHardy240.15%30.64%
Christoph Paasch210.13%10.21%
Thomas Graf210.13%30.64%
Rick Jones200.12%10.21%
Douglas Caetano dos Santos190.12%10.21%
Tom Herbert180.11%30.64%
Ian Morris180.11%20.43%
Laurent Chavey170.11%10.21%
Johannes Weiner160.10%20.43%
Ben Hutchings150.09%10.21%
Ori Finkelman150.09%10.21%
Bendik Rönning Opstad140.09%10.21%
Nikolay Borisov140.09%10.21%
Mel Gorman130.08%10.21%
Joe Perches130.08%20.43%
Jerry Chu110.07%10.21%
Eric Paris110.07%10.21%
Gao Feng100.06%10.21%
Tom Quetchenbach100.06%10.21%
Julian Anastasov90.06%10.21%
Marcelo Ricardo Leitner90.06%10.21%
Jarek Poplawski90.06%10.21%
Hannes Frederic Sowa70.04%10.21%
John Ogness70.04%10.21%
Fengguang Wu60.04%10.21%
Philip Love40.02%10.21%
Brian Haley40.02%10.21%
Gerrit Renker40.02%20.43%
Wei Wang40.02%10.21%
John Dykstra40.02%10.21%
Glauber de Oliveira Costa30.02%10.21%
Tejun Heo30.02%10.21%
Ian Campbell20.01%10.21%
Christoph Lameter20.01%10.21%
James Morris20.01%10.21%
Wei Liu20.01%10.21%
Uwe Kleine-König10.01%10.21%
Adrian Bunk10.01%10.21%
Steven Cole10.01%10.21%
Pravin B Shelar10.01%10.21%
Renato Westphal10.01%10.21%
Hua Zhong10.01%10.21%
Jianjun Kong10.01%10.21%
KOVACS Krisztian10.01%10.21%
Total16083100.00%467100.00%
Directory: net/ipv4
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