cregit-Linux how code gets into the kernel

Release 4.8 net/ipv4/tcp_ipv4.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).
 *
 *              IPv4 specific functions
 *
 *
 *              code split from:
 *              linux/ipv4/tcp.c
 *              linux/ipv4/tcp_input.c
 *              linux/ipv4/tcp_output.c
 *
 *              See tcp.c for author information
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */

/*
 * Changes:
 *              David S. Miller :       New socket lookup architecture.
 *                                      This code is dedicated to John Dyson.
 *              David S. Miller :       Change semantics of established hash,
 *                                      half is devoted to TIME_WAIT sockets
 *                                      and the rest go in the other half.
 *              Andi Kleen :            Add support for syncookies and fixed
 *                                      some bugs: ip options weren't passed to
 *                                      the TCP layer, missed a check for an
 *                                      ACK bit.
 *              Andi Kleen :            Implemented fast path mtu discovery.
 *                                      Fixed many serious bugs in the
 *                                      request_sock handling and moved
 *                                      most of it into the af independent code.
 *                                      Added tail drop and some other bugfixes.
 *                                      Added new listen semantics.
 *              Mike McLagan    :       Routing by source
 *      Juan Jose Ciarlante:            ip_dynaddr bits
 *              Andi Kleen:             various fixes.
 *      Vitaly E. Lavrov        :       Transparent proxy revived after year
 *                                      coma.
 *      Andi Kleen              :       Fix new listen.
 *      Andi Kleen              :       Fix accept error reporting.
 *      YOSHIFUJI Hideaki @USAGI and:   Support IPV6_V6ONLY socket option, which
 *      Alexey Kuznetsov                allow both IPv4 and IPv6 sockets to bind
 *                                      a single port at the same time.
 */


#define pr_fmt(fmt) "TCP: " fmt

#include <linux/bottom_half.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/module.h>
#include <linux/random.h>
#include <linux/cache.h>
#include <linux/jhash.h>
#include <linux/init.h>
#include <linux/times.h>
#include <linux/slab.h>

#include <net/net_namespace.h>
#include <net/icmp.h>
#include <net/inet_hashtables.h>
#include <net/tcp.h>
#include <net/transp_v6.h>
#include <net/ipv6.h>
#include <net/inet_common.h>
#include <net/timewait_sock.h>
#include <net/xfrm.h>
#include <net/secure_seq.h>
#include <net/busy_poll.h>

#include <linux/inet.h>
#include <linux/ipv6.h>
#include <linux/stddef.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>

#include <crypto/hash.h>
#include <linux/scatterlist.h>


int sysctl_tcp_tw_reuse __read_mostly;

int sysctl_tcp_low_latency __read_mostly;

EXPORT_SYMBOL(sysctl_tcp_low_latency);

#ifdef CONFIG_TCP_MD5SIG
static int tcp_v4_md5_hash_hdr(char *md5_hash, const struct tcp_md5sig_key *key,
			       __be32 daddr, __be32 saddr, const struct tcphdr *th);
#endif


struct inet_hashinfo tcp_hashinfo;

EXPORT_SYMBOL(tcp_hashinfo);


static __u32 tcp_v4_init_sequence(const struct sk_buff *skb) { return secure_tcp_sequence_number(ip_hdr(skb)->daddr, ip_hdr(skb)->saddr, tcp_hdr(skb)->dest, tcp_hdr(skb)->source); }

Contributors

PersonTokensPropCommitsCommitProp
arnaldo carvalho de meloarnaldo carvalho de melo3784.09%342.86%
linus torvaldslinus torvalds49.09%114.29%
david s. millerdavid s. miller24.55%228.57%
eric dumazeteric dumazet12.27%114.29%
Total44100.00%7100.00%


int tcp_twsk_unique(struct sock *sk, struct sock *sktw, void *twp) { const struct tcp_timewait_sock *tcptw = tcp_twsk(sktw); struct tcp_sock *tp = tcp_sk(sk); /* With PAWS, it is safe from the viewpoint of data integrity. Even without PAWS it is safe provided sequence spaces do not overlap i.e. at data rates <= 80Mbit/sec. Actually, the idea is close to VJ's one, only timestamp cache is held not per host, but per port pair and TW bucket is used as state holder. If TW bucket has been already destroyed we fall back to VJ's scheme and use initial timestamp retrieved from peer table. */ if (tcptw->tw_ts_recent_stamp && (!twp || (sysctl_tcp_tw_reuse && get_seconds() - tcptw->tw_ts_recent_stamp > 1))) { tp->write_seq = tcptw->tw_snd_nxt + 65535 + 2; if (tp->write_seq == 0) tp->write_seq = 1; tp->rx_opt.ts_recent = tcptw->tw_ts_recent; tp->rx_opt.ts_recent_stamp = tcptw->tw_ts_recent_stamp; sock_hold(sktw); return 1; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
arnaldo carvalho de meloarnaldo carvalho de melo12197.58%133.33%
james morrisjames morris21.61%133.33%
ian morrisian morris10.81%133.33%
Total124100.00%3100.00%

EXPORT_SYMBOL_GPL(tcp_twsk_unique); /* This will initiate an outgoing connection. */
int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) { struct sockaddr_in *usin = (struct sockaddr_in *)uaddr; struct inet_sock *inet = inet_sk(sk); struct tcp_sock *tp = tcp_sk(sk); __be16 orig_sport, orig_dport; __be32 daddr, nexthop; struct flowi4 *fl4; struct rtable *rt; int err; struct ip_options_rcu *inet_opt; if (addr_len < sizeof(struct sockaddr_in)) return -EINVAL; if (usin->sin_family != AF_INET) return -EAFNOSUPPORT; nexthop = daddr = usin->sin_addr.s_addr; inet_opt = rcu_dereference_protected(inet->inet_opt, lockdep_sock_is_held(sk)); if (inet_opt && inet_opt->opt.srr) { if (!daddr) return -EINVAL; nexthop = inet_opt->opt.faddr; } orig_sport = inet->inet_sport; orig_dport = usin->sin_port; fl4 = &inet->cork.fl.u.ip4; rt = ip_route_connect(fl4, nexthop, inet->inet_saddr, RT_CONN_FLAGS(sk), sk->sk_bound_dev_if, IPPROTO_TCP, orig_sport, orig_dport, sk); if (IS_ERR(rt)) { err = PTR_ERR(rt); if (err == -ENETUNREACH) IP_INC_STATS(sock_net(sk), IPSTATS_MIB_OUTNOROUTES); return err; } if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) { ip_rt_put(rt); return -ENETUNREACH; } if (!inet_opt || !inet_opt->opt.srr) daddr = fl4->daddr; if (!inet->inet_saddr) inet->inet_saddr = fl4->saddr; sk_rcv_saddr_set(sk, inet->inet_saddr); if (tp->rx_opt.ts_recent_stamp && inet->inet_daddr != daddr) { /* Reset inherited state */ tp->rx_opt.ts_recent = 0; tp->rx_opt.ts_recent_stamp = 0; if (likely(!tp->repair)) tp->write_seq = 0; } if (tcp_death_row.sysctl_tw_recycle && !tp->rx_opt.ts_recent_stamp && fl4->daddr == daddr) tcp_fetch_timewait_stamp(sk, &rt->dst); inet->inet_dport = usin->sin_port; sk_daddr_set(sk, daddr); inet_csk(sk)->icsk_ext_hdr_len = 0; if (inet_opt) inet_csk(sk)->icsk_ext_hdr_len = inet_opt->opt.optlen; tp->rx_opt.mss_clamp = TCP_MSS_DEFAULT; /* Socket identity is still unknown (sport may be zero). * However we set state to SYN-SENT and not releasing socket * lock select source port, enter ourselves into the hash tables and * complete initialization after this. */ tcp_set_state(sk, TCP_SYN_SENT); err = inet_hash_connect(&tcp_death_row, sk); if (err) goto failure; sk_set_txhash(sk); rt = ip_route_newports(fl4, rt, orig_sport, orig_dport, inet->inet_sport, inet->inet_dport, sk); if (IS_ERR(rt)) { err = PTR_ERR(rt); rt = NULL; goto failure; } /* OK, now commit destination to socket. */ sk->sk_gso_type = SKB_GSO_TCPV4; sk_setup_caps(sk, &rt->dst); if (!tp->write_seq && likely(!tp->repair)) tp->write_seq = secure_tcp_sequence_number(inet->inet_saddr, inet->inet_daddr, inet->inet_sport, usin->sin_port); inet->inet_id = tp->write_seq ^ jiffies; err = tcp_connect(sk); rt = NULL; if (err) goto failure; return 0; failure: /* * This unhashes the socket and releases the local port, * if necessary. */ tcp_set_state(sk, TCP_CLOSE); ip_rt_put(rt); sk->sk_route_caps = 0; inet->inet_dport = 0; return err; }

Contributors

PersonTokensPropCommitsCommitProp
arnaldo carvalho de meloarnaldo carvalho de melo20832.91%1322.41%
david s. millerdavid s. miller14322.63%1118.97%
pre-gitpre-git7111.23%1118.97%
alexey kuznetsovalexey kuznetsov7011.08%35.17%
eric dumazeteric dumazet558.70%58.62%
pavel emelianovpavel emelianov233.64%23.45%
stephen hemmingerstephen hemminger182.85%11.72%
linus torvaldslinus torvalds162.53%35.17%
wei dongwei dong121.90%11.72%
herbert xuherbert xu60.95%11.72%
sathya perlasathya perla40.63%11.72%
hannes frederic sowahannes frederic sowa10.16%11.72%
steven colesteven cole10.16%11.72%
patrick mchardypatrick mchardy10.16%11.72%
al viroal viro10.16%11.72%
william allen simpsonwilliam allen simpson10.16%11.72%
tom herberttom herbert10.16%11.72%
Total632100.00%58100.00%

EXPORT_SYMBOL(tcp_v4_connect); /* * This routine reacts to ICMP_FRAG_NEEDED mtu indications as defined in RFC1191. * It can be called through tcp_release_cb() if socket was owned by user * at the time tcp_v4_err() was called to handle ICMP message. */
void tcp_v4_mtu_reduced(struct sock *sk) { struct dst_entry *dst; struct inet_sock *inet = inet_sk(sk); u32 mtu = tcp_sk(sk)->mtu_info; dst = inet_csk_update_pmtu(sk, mtu); if (!dst) return; /* Something is about to be wrong... Remember soft error * for the case, if this connection will not able to recover. */ if (mtu < dst_mtu(dst) && ip_dont_fragment(sk, dst)) sk->sk_err_soft = EMSGSIZE; mtu = dst_mtu(dst); if (inet->pmtudisc != IP_PMTUDISC_DONT && ip_sk_accept_pmtu(sk) && inet_csk(sk)->icsk_pmtu_cookie > mtu) { tcp_sync_mss(sk, mtu); /* Resend the TCP packet because it's * clear that the old packet has been * dropped. This is the new "fast" path mtu * discovery. */ tcp_simple_retransmit(sk); } /* else let the usual retransmit timer handle it */ }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git6655.93%533.33%
david s. millerdavid s. miller1613.56%213.33%
eric dumazeteric dumazet119.32%16.67%
alexey kuznetsovalexey kuznetsov108.47%16.67%
arnaldo carvalho de meloarnaldo carvalho de melo86.78%426.67%
hannes frederic sowahannes frederic sowa54.24%16.67%
herbert xuherbert xu21.69%16.67%
Total118100.00%15100.00%

EXPORT_SYMBOL(tcp_v4_mtu_reduced);
static void do_redirect(struct sk_buff *skb, struct sock *sk) { struct dst_entry *dst = __sk_dst_check(sk, 0); if (dst) dst->ops->redirect(dst, sk, skb); }

Contributors

PersonTokensPropCommitsCommitProp
david s. millerdavid s. miller45100.00%2100.00%
Total45100.00%2100.00%

/* handle ICMP messages on TCP_NEW_SYN_RECV request sockets */
void tcp_req_err(struct sock *sk, u32 seq, bool abort) { struct request_sock *req = inet_reqsk(sk); struct net *net = sock_net(sk); /* ICMPs are not backlogged, hence we cannot get * an established socket here. */ if (seq != tcp_rsk(req)->snt_isn) { __NET_INC_STATS(net, LINUX_MIB_OUTOFWINDOWICMPS); } else if (abort) { /* * Still in SYN_RECV, just remove it silently. * There is no good way to pass the error to the newly * created socket, and POSIX does not want network * errors returned from accept(). */ inet_csk_reqsk_queue_drop(req->rsk_listener, req); tcp_listendrop(req->rsk_listener); } reqsk_put(req); }

Contributors

PersonTokensPropCommitsCommitProp
eric dumazeteric dumazet8396.51%583.33%
fan dufan du33.49%116.67%
Total86100.00%6100.00%

EXPORT_SYMBOL(tcp_req_err); /* * This routine is called by the ICMP module when it gets some * sort of error condition. If err < 0 then the socket should * be closed and the error returned to the user. If err > 0 * it's just the icmp type << 8 | icmp code. After adjustment * header points to the first 8 bytes of the tcp header. We need * to find the appropriate port. * * The locking strategy used here is very "optimistic". When * someone else accesses the socket the ICMP is just dropped * and for some paths there is no check at all. * A more general error queue to queue errors for later handling * is probably better. * */
void tcp_v4_err(struct sk_buff *icmp_skb, u32 info) { const struct iphdr *iph = (const struct iphdr *)icmp_skb->data; struct tcphdr *th = (struct tcphdr *)(icmp_skb->data + (iph->ihl << 2)); struct inet_connection_sock *icsk; struct tcp_sock *tp; struct inet_sock *inet; const int type = icmp_hdr(icmp_skb)->type; const int code = icmp_hdr(icmp_skb)->code; struct sock *sk; struct sk_buff *skb; struct request_sock *fastopen; __u32 seq, snd_una; __u32 remaining; int err; struct net *net = dev_net(icmp_skb->dev); sk = __inet_lookup_established(net, &tcp_hashinfo, iph->daddr, th->dest, iph->saddr, ntohs(th->source), inet_iif(icmp_skb)); if (!sk) { __ICMP_INC_STATS(net, ICMP_MIB_INERRORS); return; } if (sk->sk_state == TCP_TIME_WAIT) { inet_twsk_put(inet_twsk(sk)); return; } seq = ntohl(th->seq); if (sk->sk_state == TCP_NEW_SYN_RECV) return tcp_req_err(sk, seq, type == ICMP_PARAMETERPROB || type == ICMP_TIME_EXCEEDED || (type == ICMP_DEST_UNREACH && (code == ICMP_NET_UNREACH || code == ICMP_HOST_UNREACH))); bh_lock_sock(sk); /* If too many ICMPs get dropped on busy * servers this needs to be solved differently. * We do take care of PMTU discovery (RFC1191) special case : * we can receive locally generated ICMP messages while socket is held. */ if (sock_owned_by_user(sk)) { if (!(type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED)) __NET_INC_STATS(net, LINUX_MIB_LOCKDROPPEDICMPS); } if (sk->sk_state == TCP_CLOSE) goto out; if (unlikely(iph->ttl < inet_sk(sk)->min_ttl)) { __NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP); goto out; } icsk = inet_csk(sk); tp = tcp_sk(sk); /* XXX (TFO) - tp->snd_una should be ISN (tcp_create_openreq_child() */ fastopen = tp->fastopen_rsk; snd_una = fastopen ? tcp_rsk(fastopen)->snt_isn : tp->snd_una; if (sk->sk_state != TCP_LISTEN && !between(seq, snd_una, tp->snd_nxt)) { __NET_INC_STATS(net, LINUX_MIB_OUTOFWINDOWICMPS); goto out; } switch (type) { case ICMP_REDIRECT: do_redirect(icmp_skb, sk); goto out; case ICMP_SOURCE_QUENCH: /* Just silently ignore these. */ goto out; case ICMP_PARAMETERPROB: err = EPROTO; break; case ICMP_DEST_UNREACH: if (code > NR_ICMP_UNREACH) goto out; if (code == ICMP_FRAG_NEEDED) { /* PMTU discovery (RFC1191) */ /* We are not interested in TCP_LISTEN and open_requests * (SYN-ACKs send out by Linux are always <576bytes so * they should go through unfragmented). */ if (sk->sk_state == TCP_LISTEN) goto out; tp->mtu_info = info; if (!sock_owned_by_user(sk)) { tcp_v4_mtu_reduced(sk); } else { if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED, &tp->tsq_flags)) sock_hold(sk); } goto out; } err = icmp_err_convert[code].errno; /* check if icmp_skb allows revert of backoff * (see draft-zimmermann-tcp-lcd) */ if (code != ICMP_NET_UNREACH && code != ICMP_HOST_UNREACH) break; if (seq != tp->snd_una || !icsk->icsk_retransmits || !icsk->icsk_backoff || fastopen) break; if (sock_owned_by_user(sk)) break; icsk->icsk_backoff--; icsk->icsk_rto = tp->srtt_us ? __tcp_set_rto(tp) : TCP_TIMEOUT_INIT; icsk->icsk_rto = inet_csk_rto_backoff(icsk, TCP_RTO_MAX); skb = tcp_write_queue_head(sk); BUG_ON(!skb); remaining = icsk->icsk_rto - min(icsk->icsk_rto, tcp_time_stamp - tcp_skb_timestamp(skb)); if (remaining) { inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, remaining, TCP_RTO_MAX); } else { /* RTO revert clocked out retransmission. * Will retransmit now */ tcp_retransmit_timer(sk); } break; case ICMP_TIME_EXCEEDED: err = EHOSTUNREACH; break; default: goto out; } switch (sk->sk_state) { case TCP_SYN_SENT: case TCP_SYN_RECV: /* Only in fast or simultaneous open. If a fast open socket is * is already accepted it is treated as a connected one below. */ if (fastopen && !fastopen->sk) break; if (!sock_owned_by_user(sk)) { sk->sk_err = err; sk->sk_error_report(sk); tcp_done(sk); } else { sk->sk_err_soft = err; } goto out; } /* If we've already connected we will keep trying * until we time out, or the user gives up. * * rfc1122 4.2.3.9 allows to consider as hard errors * only PROTO_UNREACH and PORT_UNREACH (well, FRAG_FAILED too, * but it is obsoleted by pmtu discovery). * * Note, that in modern internet, where routing is unreliable * and in each dark corner broken firewalls sit, sending random * errors ordered by their masters even this two messages finally lose * their original sense (even Linux sends invalid PORT_UNREACHs) * * Now we are in compliance with RFCs. * --ANK (980905) */ inet = inet_sk(sk); if (!sock_owned_by_user(sk) && inet->recverr) { sk->sk_err = err; sk->sk_error_report(sk); } else { /* Only an error on timeout */ sk->sk_err_soft = err; } out: bh_unlock_sock(sk); sock_put(sk); }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git31640.83%817.02%
damian lukowskidamian lukowski13317.18%24.26%
eric dumazeteric dumazet12616.28%1225.53%
yuchung chengyuchung cheng374.78%12.13%
david s. millerdavid s. miller374.78%48.51%
arnaldo carvalho de meloarnaldo carvalho de melo293.75%817.02%
stephen hemmingerstephen hemminger273.49%12.13%
linus torvaldslinus torvalds222.84%12.13%
pavel emelianovpavel emelianov192.45%48.51%
benjamin lahaisebenjamin lahaise121.55%12.13%
jerry chujerry chu91.16%24.26%
hideaki yoshifujihideaki yoshifuji60.78%24.26%
ian morrisian morris10.13%12.13%
Total774100.00%47100.00%


void __tcp_v4_send_check(struct sk_buff *skb, __be32 saddr, __be32 daddr) { struct tcphdr *th = tcp_hdr(skb); if (skb->ip_summed == CHECKSUM_PARTIAL) { th->check = ~tcp_v4_check(skb->len, saddr, daddr, 0); skb->csum_start = skb_transport_header(skb) - skb->head; skb->csum_offset = offsetof(struct tcphdr, check); } else { th->check = tcp_v4_check(skb->len, saddr, daddr, csum_partial(th, th->doff << 2, skb->csum)); } }

Contributors

PersonTokensPropCommitsCommitProp
linus torvaldslinus torvalds3733.04%110.00%
pre-gitpre-git3531.25%220.00%
herbert xuherbert xu2825.00%220.00%
arnaldo carvalho de meloarnaldo carvalho de melo98.04%220.00%
patrick mchardypatrick mchardy10.89%110.00%
al viroal viro10.89%110.00%
david s. millerdavid s. miller10.89%110.00%
Total112100.00%10100.00%

/* This routine computes an IPv4 TCP checksum. */
void tcp_v4_send_check(struct sock *sk, struct sk_buff *skb) { const struct inet_sock *inet = inet_sk(sk); __tcp_v4_send_check(skb, inet->inet_saddr, inet->inet_daddr); }

Contributors

PersonTokensPropCommitsCommitProp
herbert xuherbert xu3897.44%150.00%
eric dumazeteric dumazet12.56%150.00%
Total39100.00%2100.00%

EXPORT_SYMBOL(tcp_v4_send_check); /* * This routine will send an RST to the other tcp. * * Someone asks: why I NEVER use socket parameters (TOS, TTL etc.) * for reset. * Answer: if a packet caused RST, it is not for a socket * existing in our system, if it is matched to a socket, * it is just duplicate segment or bug in other side's TCP. * So that we build reply only basing on parameters * arrived with segment. * Exception: precedence violation. We do not implement it in any case. */
static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb) { const struct tcphdr *th = tcp_hdr(skb); struct { struct tcphdr th; #ifdef CONFIG_TCP_MD5SIG __be32 opt[(TCPOLEN_MD5SIG_ALIGNED >> 2)]; #endif } rep; struct ip_reply_arg arg; #ifdef CONFIG_TCP_MD5SIG struct tcp_md5sig_key *key = NULL; const __u8 *hash_location = NULL; unsigned char newhash[16]; int genhash; struct sock *sk1 = NULL; #endif struct net *net; /* Never send a reset in response to a reset. */ if (th->rst) return; /* If sk not NULL, it means we did a successful lookup and incoming * route had to be correct. prequeue might have dropped our dst. */ if (!sk && skb_rtable(skb)->rt_type != RTN_LOCAL) return; /* Swap the send and the receive. */ memset(&rep, 0, sizeof(rep)); rep.th.dest = th->source; rep.th.source = th->dest; rep.th.doff = sizeof(struct tcphdr) / 4; rep.th.rst = 1; if (th->ack) { rep.th.seq = th->ack_seq; } else { rep.th.ack = 1; rep.th.ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin + skb->len - (th->doff << 2)); } memset(&arg, 0, sizeof(arg)); arg.iov[0].iov_base = (unsigned char *)&rep; arg.iov[0].iov_len = sizeof(rep.th); net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev); #ifdef CONFIG_TCP_MD5SIG rcu_read_lock(); hash_location = tcp_parse_md5sig_option(th); if (sk && sk_fullsock(sk)) { key = tcp_md5_do_lookup(sk, (union tcp_md5_addr *) &ip_hdr(skb)->saddr, AF_INET); } else if (hash_location) { /* * active side is lost. Try to find listening socket through * source port, and then find md5 key through listening socket. * we are not loose security here: * Incoming packet is checked with md5 hash with finding key, * no RST generated if md5 hash doesn't match. */ sk1 = __inet_lookup_listener(net, &tcp_hashinfo, NULL, 0, ip_hdr(skb)->saddr, th->source, ip_hdr(skb)->daddr, ntohs(th->source), inet_iif(skb)); /* don't send rst if it can't find key */ if (!sk1) goto out; key = tcp_md5_do_lookup(sk1, (union tcp_md5_addr *) &ip_hdr(skb)->saddr, AF_INET); if (!key) goto out; genhash = tcp_v4_md5_hash_skb(newhash, key, NULL, skb); if (genhash || memcmp(hash_location, newhash, 16) != 0) goto out; } if (key) { rep.opt[0] = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); /* Update length and the length the header thinks exists */ arg.iov[0].iov_len += TCPOLEN_MD5SIG_ALIGNED; rep.th.doff = arg.iov[0].iov_len / 4; tcp_v4_md5_hash_hdr((__u8 *) &rep.opt[1], key, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr, &rep.th); } #endif arg.csum = csum_tcpudp_nofold(ip_hdr(skb)->daddr, ip_hdr(skb)->saddr, /* XXX */ arg.iov[0].iov_len, IPPROTO_TCP, 0); arg.csumoffset = offsetof(struct tcphdr, check) / 2; arg.flags = (sk && inet_sk_transparent(sk)) ? IP_REPLY_ARG_NOSRCCHECK : 0; /* When socket is gone, all binding information is lost. * routing might fail in this case. No choice here, if we choose to force * input interface, we will misroute in case of asymmetric route. */ if (sk) arg.bound_dev_if = sk->sk_bound_dev_if; BUILD_BUG_ON(offsetof(struct sock, sk_bound_dev_if) != offsetof(struct inet_timewait_sock, tw_bound_dev_if)); arg.tos = ip_hdr(skb)->tos; local_bh_disable(); ip_send_unicast_reply(*this_cpu_ptr(net->ipv4.tcp_sk), skb, &TCP_SKB_CB(skb)->header.h4.opt, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr, &arg, arg.iov[0].iov_len); __TCP_INC_STATS(net, TCP_MIB_OUTSEGS); __TCP_INC_STATS(net, TCP_MIB_OUTRSTS); local_bh_enable(); #ifdef CONFIG_TCP_MD5SIG out: rcu_read_unlock(); #endif }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git22629.35%1226.67%
hideaki yoshifujihideaki yoshifuji17122.21%24.44%
shawn lushawn lu14919.35%24.44%
eric dumazeteric dumazet7710.00%1226.67%
florian westphalflorian westphal557.14%24.44%
arnaldo carvalho de meloarnaldo carvalho de melo182.34%36.67%
kovacs krisztiankovacs krisztian162.08%12.22%
david s. millerdavid s. miller151.95%24.44%
pavel emelianovpavel emelianov111.43%24.44%
tom herberttom herbert111.43%12.22%
ilpo jarvinenilpo jarvinen101.30%24.44%
alexey kuznetsovalexey kuznetsov50.65%12.22%
craig gallekcraig gallek40.52%12.22%
adam langleyadam langley10.13%12.22%
al viroal viro10.13%12.22%
Total770100.00%45100.00%

/* The code following below sending ACKs in SYN-RECV and TIME-WAIT states outside socket context is ugly, certainly. What can I do? */
static void tcp_v4_send_ack(struct net *net, struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 tsval, u32 tsecr, int oif, struct tcp_md5sig_key *key, int reply_flags, u8 tos) { const struct tcphdr *th = tcp_hdr(skb); struct { struct tcphdr th; __be32 opt[(TCPOLEN_TSTAMP_ALIGNED >> 2) #ifdef CONFIG_TCP_MD5SIG + (TCPOLEN_MD5SIG_ALIGNED >> 2) #endif ]; } rep; struct ip_reply_arg arg; memset(&rep.th, 0, sizeof(struct tcphdr)); memset(&arg, 0, sizeof(arg)); arg.iov[0].iov_base = (unsigned char *)&rep; arg.iov[0].iov_len = sizeof(rep.th); if (tsecr) { rep.opt[0] = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); rep.opt[1] = htonl(tsval); rep.opt[2] = htonl(tsecr); arg.iov[0].iov_len += TCPOLEN_TSTAMP_ALIGNED; } /* Swap the send and the receive. */ rep.th.dest = th->source; rep.th.source = th->dest; rep.th.doff = arg.iov[0].iov_len / 4; rep.th.seq = htonl(seq); rep.th.ack_seq = htonl(ack); rep.th.ack = 1; rep.th.window = htons(win); #ifdef CONFIG_TCP_MD5SIG if (key) { int offset = (tsecr) ? 3 : 0; rep.opt[offset++] = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); arg.iov[0].iov_len += TCPOLEN_MD5SIG_ALIGNED; rep.th.doff = arg.iov[0].iov_len/4; tcp_v4_md5_hash_hdr((__u8 *) &rep.opt[offset], key, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr, &rep.th); } #endif arg.flags = reply_flags; arg.csum = csum_tcpudp_nofold(ip_hdr(skb)->daddr, ip_hdr(skb)->saddr, /* XXX */ arg.iov[0].iov_len, IPPROTO_TCP, 0); arg.csumoffset = offsetof(struct tcphdr, check) / 2; if (oif) arg.bound_dev_if = oif; arg.tos = tos; local_bh_disable(); ip_send_unicast_reply(*this_cpu_ptr(net->ipv4.tcp_sk), skb, &TCP_SKB_CB(skb)->header.h4.opt, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr, &arg, arg.iov[0].iov_len); __TCP_INC_STATS(net, TCP_MIB_OUTSEGS); local_bh_enable(); }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git30755.22%1332.50%
hideaki yoshifujihideaki yoshifuji14025.18%410.00%
eric dumazeteric dumazet427.55%820.00%
arnaldo carvalho de meloarnaldo carvalho de melo193.42%410.00%
david s. millerdavid s. miller152.70%25.00%
kovacs krisztiankovacs krisztian91.62%12.50%
andrey vaginandrey vagin81.44%12.50%
patrick mchardypatrick mchardy81.44%12.50%
adam langleyadam langley30.54%25.00%
pavel emelianovpavel emelianov30.54%25.00%
al viroal viro10.18%12.50%
craig schlentercraig schlenter10.18%12.50%
Total556100.00%40100.00%


static void tcp_v4_timewait_ack(struct sock *sk, struct sk_buff *skb) { struct inet_timewait_sock *tw = inet_twsk(sk); struct tcp_timewait_sock *tcptw = tcp_twsk(sk); tcp_v4_send_ack(sock_net(sk), skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, tcp_time_stamp + tcptw->tw_ts_offset, tcptw->tw_ts_recent, tw->tw_bound_dev_if, tcp_twsk_md5_key(tcptw), tw->tw_transparent ? IP_REPLY_ARG_NOSRCCHECK : 0, tw->tw_tos ); inet_twsk_put(tw); }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git4242.86%646.15%
arnaldo carvalho de meloarnaldo carvalho de melo2424.49%215.38%
eric dumazeteric dumazet99.18%215.38%
hideaki yoshifujihideaki yoshifuji99.18%17.69%
kovacs krisztiankovacs krisztian88.16%17.69%
andrey vaginandrey vagin66.12%17.69%
Total98100.00%13100.00%


static void tcp_v4_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb, struct request_sock *req) { /* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV * sk->sk_state == TCP_SYN_RECV -> for Fast Open. */ u32 seq = (sk->sk_state == TCP_LISTEN) ? tcp_rsk(req)->snt_isn + 1 : tcp_sk(sk)->snd_nxt; /* RFC 7323 2.3 * The window field (SEG.WND) of every outgoing segment, with the * exception of <SYN> segments, MUST be right-shifted by * Rcv.Wind.Shift bits: */ tcp_v4_send_ack(sock_net(sk), skb, seq, tcp_rsk(req)->rcv_nxt, req->rsk_rcv_wnd >> inet_rsk(req)->rcv_wscale, tcp_time_stamp, req->ts_recent, 0, tcp_md5_do_lookup(sk, (union tcp_md5_addr *)&ip_hdr(skb)->daddr, AF_INET), inet_rsk(req)->no_srccheck ? IP_REPLY_ARG_NOSRCCHECK : 0, ip_hdr(skb)->tos); }

Contributors

PersonTokensPropCommitsCommitProp
eric dumazeteric dumazet4031.50%635.29%
pre-gitpre-git3124.41%423.53%
jerry chujerry chu1713.39%15.88%
hideaki yoshifujihideaki yoshifuji1310.24%15.88%
kovacs krisztiankovacs krisztian118.66%15.88%
arnaldo carvalho de meloarnaldo carvalho de melo86.30%211.76%
gui jianfenggui jianfeng53.94%15.88%
andrey vaginandrey vagin21.57%15.88%
Total127100.00%17100.00%

/* * Send a SYN-ACK after having received a SYN. * This still operates on a request_sock only, not on a big * socket. */
static int tcp_v4_send_synack(const struct sock *sk, struct dst_entry *dst, struct flowi *fl, struct request_sock *req, struct tcp_fastopen_cookie *foc, enum tcp_synack_type synack_type) { const struct inet_request_sock *ireq = inet_rsk(req); struct flowi4 fl4; int err = -1; struct sk_buff *skb; /* First, grab a route. */ if (!dst && (dst = inet_csk_route_req(sk, &fl4, req)) == NULL) return -1; skb = tcp_make_synack(sk, dst, req, foc, synack_type); if (skb) { __tcp_v4_send_check(skb, ireq->ir_loc_addr, ireq->ir_rmt_addr); err = ip_build_and_send_pkt(skb, sk, ireq->ir_loc_addr, ireq->ir_rmt_addr, ireq->opt); err = net_xmit_eval(err); } return err; }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git9058.82%420.00%
arnaldo carvalho de meloarnaldo carvalho de melo1912.42%420.00%
eric dumazeteric dumazet117.19%420.00%
david s. millerdavid s. miller74.58%15.00%
octavian purdilaoctavian purdila63.92%210.00%
william allen simpsonwilliam allen simpson63.92%15.00%
yuchung chengyuchung cheng53.27%15.00%
denis v. lunevdenis v. lunev42.61%15.00%
gerrit renkergerrit renker42.61%15.00%
herbert xuherbert xu10.65%15.00%
Total153100.00%20100.00%

/* * IPv4 request_sock destructor. */
static void tcp_v4_reqsk_destructor(struct request_sock *req) { kfree(inet_rsk(req)->opt); }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git1676.19%360.00%
arnaldo carvalho de meloarnaldo carvalho de melo523.81%240.00%
Total21100.00%5100.00%

#ifdef CONFIG_TCP_MD5SIG /* * RFC2385 MD5 checksumming requires a mapping of * IP address->MD5 Key. * We need to maintain these in the sk structure. */ /* Find the Key structure for an address. */
struct tcp_md5sig_key *tcp_md5_do_lookup(const struct sock *sk, const union tcp_md5_addr *addr, int family) { const struct tcp_sock *tp = tcp_sk(sk); struct tcp_md5sig_key *key; unsigned int size = sizeof(struct in_addr); const struct tcp_md5sig_info *md5sig; /* caller either holds rcu_read_lock() or socket lock */ md5sig = rcu_dereference_check(tp->md5sig_info, lockdep_sock_is_held(sk)); if (!md5sig) return NULL; #if IS_ENABLED(CONFIG_IPV6) if (family == AF_INET6) size = sizeof(struct in6_addr); #endif hlist_for_each_entry_rcu(key, &md5sig->head, node) { if (key->family != family) continue; if (!memcmp(&key->addr, addr, size)) return key; } return NULL; }

Contributors

PersonTokensPropCommitsCommitProp
eric dumazeteric dumazet9165.47%571.43%
hideaki yoshifujihideaki yoshifuji4733.81%114.29%
hannes frederic sowahannes frederic sowa10.72%114.29%
Total139100.00%7100.00%

EXPORT_SYMBOL(tcp_md5_do_lookup);
struct tcp_md5sig_key *tcp_v4_md5_lookup(const struct sock *sk, const struct sock *addr_sk) { const union tcp_md5_addr *addr; addr = (const union tcp_md5_addr *)&addr_sk->sk_daddr; return tcp_md5_do_lookup(sk, addr, AF_INET); }

Contributors

PersonTokensPropCommitsCommitProp
eric dumazeteric dumazet2858.33%480.00%
hideaki yoshifujihideaki yoshifuji2041.67%120.00%
Total48100.00%5100.00%

EXPORT_SYMBOL(tcp_v4_md5_lookup); /* This can be called on a newly created socket, from other files */
int tcp_md5_do_add(struct sock *sk, const union tcp_md5_addr *addr, int family, const u8 *newkey, u8 newkeylen, gfp_t gfp) { /* Add Key to the list */ struct tcp_md5sig_key *key; struct tcp_sock *tp = tcp_sk(sk); struct tcp_md5sig_info *md5sig; key = tcp_md5_do_lookup(sk, addr, family); if (key) { /* Pre-existing entry - just update that one. */ memcpy(key->key, newkey, newkeylen); key->keylen = newkeylen; return 0; } md5sig = rcu_dereference_protected(tp->md5sig_info, lockdep_sock_is_held(sk)); if (!md5sig) { md5sig = kmalloc(sizeof(*md5sig), gfp); if (!md5sig) return -ENOMEM; sk_nocaps_add(sk, NETIF_F_GSO_MASK); INIT_HLIST_HEAD(&md5sig->head); rcu_assign_pointer(tp->md5sig_info, md5sig); } key = sock_kmalloc(sk, sizeof(*key), gfp); if (!key) return -ENOMEM; if (!tcp_alloc_md5sig_pool()) { sock_kfree_s(sk, key, sizeof(*key)); return -ENOMEM; } memcpy(key->key, newkey, newkeylen); key->keylen = newkeylen; key->family = family; memcpy(&key->addr, addr, (family == AF_INET6) ? sizeof(struct in6_addr) : sizeof(struct in_addr)); hlist_add_head_rcu(&key->node, &md5sig->head); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
eric dumazeteric dumazet13248.53%646.15%
hideaki yoshifujihideaki yoshifuji12746.69%17.69%
arnaldo carvalho de meloarnaldo carvalho de melo41.47%17.69%
david s. millerdavid s. miller31.10%17.69%
zheng yanzheng yan31.10%17.69%
hannes frederic sowahannes frederic sowa10.37%17.69%
matthias dellwegmatthias dellweg10.37%17.69%
aydin arikaydin arik10.37%17.69%
Total272100.00%13100.00%

EXPORT_SYMBOL(tcp_md5_do_add);
int tcp_md5_do_del(struct sock *sk, const union tcp_md5_addr *addr, int family) { struct tcp_md5sig_key *key; key = tcp_md5_do_lookup(sk, addr, family); if (!key) return -ENOENT; hlist_del_rcu(&key->node); atomic_sub(sizeof(*key), &sk->sk_omem_alloc); kfree_rcu(key, rcu); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
eric dumazeteric dumazet4660.53%250.00%
hideaki yoshifujihideaki yoshifuji2938.16%125.00%
aydin arikaydin arik11.32%125.00%
Total76100.00%4100.00%

EXPORT_SYMBOL(tcp_md5_do_del);
static void tcp_clear_md5_list(struct sock *sk) { struct tcp_sock *tp = tcp_sk(sk); struct tcp_md5sig_key *key; struct hlist_node *n; struct tcp_md5sig_info *md5sig; md5sig = rcu_dereference_protected(tp->md5sig_info, 1); hlist_for_each_entry_safe(key, n, &md5sig->head, node) { hlist_del_rcu(&key->node); atomic_sub(sizeof(*key), &sk->sk_omem_alloc); kfree_rcu(key, rcu); } }

Contributors

PersonTokensPropCommitsCommitProp
eric dumazeteric dumazet6169.32%360.00%
hideaki yoshifujihideaki yoshifuji2629.55%120.00%
stephen hemmingerstephen hemminger11.14%120.00%
Total88100.00%5100.00%


static int tcp_v4_parse_md5_keys(struct sock *sk, char __user *optval, int optlen) { struct tcp_md5sig cmd; struct sockaddr_in *sin = (struct sockaddr_in *)&cmd.tcpm_addr; if (optlen < sizeof(cmd)) return -EINVAL; if (copy_from_user(&cmd, optval, sizeof(cmd))) return -EFAULT; if (sin->sin_family != AF_INET) return -EINVAL; if (!cmd.tcpm_keylen) return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin->sin_addr.s_addr, AF_INET); if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) return -EINVAL; return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin->sin_addr.s_addr, AF_INET, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); }

Contributors

PersonTokensPropCommitsCommitProp
hideaki yoshifujihideaki yoshifuji12884.77%150.00%
eric dumazeteric dumazet2315.23%150.00%
Total151100.00%2100.00%


static int tcp_v4_md5_hash_headers(struct tcp_md5sig_pool *hp, __be32 daddr, __be32 saddr, const struct tcphdr *th, int nbytes) { struct tcp4_pseudohdr *bp; struct scatterlist sg; struct tcphdr *_th; bp = hp->scratch; bp->saddr = saddr; bp->daddr = daddr; bp->pad = 0; bp->protocol = IPPROTO_TCP; bp->len = cpu_to_be16(nbytes); _th = (struct tcphdr *)(bp + 1); memcpy(_th, th, sizeof(*th)); _th->check = 0; sg_init_one(&sg, bp, sizeof(*bp) + sizeof(*th)); ahash_request_set_crypt(hp->md5_req, &sg, NULL, sizeof(*bp) + sizeof(*th)); return crypto_ahash_update(hp->md5_req); }

Contributors

PersonTokensPropCommitsCommitProp
hideaki yoshifujihideaki yoshifuji6439.26%240.00%
eric dumazeteric dumazet5734.97%120.00%
adam langleyadam langley3018.40%120.00%
herbert xuherbert xu127.36%120.00%
Total163100.00%5100.00%


static int tcp_v4_md5_hash_hdr(char *md5_hash, const struct tcp_md5sig_key *key, __be32 daddr, __be32 saddr, const struct tcphdr *th) { struct tcp_md5sig_pool *hp; struct ahash_request *req; hp = tcp_get_md5sig_pool(); if (!hp) goto clear_hash_noput; req = hp->md5_req; if (crypto_ahash_init(req)) goto clear_hash; if (tcp_v4_md5_hash_headers(hp, daddr, saddr, th, th->doff << 2)) goto clear_hash; if (tcp_md5_hash_key(hp, key)) goto clear_hash; ahash_request_set_crypt(req, NULL, md5_hash, 0); if (crypto_ahash_final(req)) goto clear_hash; tcp_put_md5sig_pool(); return 0; clear_hash: tcp_put_md5sig_pool(); clear_hash_noput: memset(md5_hash, 0, 16); return 1; }

Contributors

PersonTokensPropCommitsCommitProp
adam langleyadam langley9262.59%114.29%
hideaki yoshifujihideaki yoshifuji3121.09%228.57%
herbert xuherbert xu1912.93%114.29%
eric dumazeteric dumazet53.40%342.86%
Total147100.00%7100.00%


int tcp_v4_md5_hash_skb(char *md5_hash, const struct tcp_md5sig_key *key, const struct sock *sk, const struct sk_buff *skb) { struct tcp_md5sig_pool *hp; struct ahash_request *req; const struct tcphdr *th = tcp_hdr(skb); __be32 saddr, daddr; if (sk) { /* valid for establish/request sockets */ saddr = sk->sk_rcv_saddr; daddr = sk->sk_daddr; } else { const struct iphdr *iph = ip_hdr(skb); saddr = iph->saddr; daddr = iph->daddr; } hp = tcp_get_md5sig_pool(); if (!hp) goto clear_hash_noput; req = hp->md5_req; if (crypto_ahash_init(req)) goto clear_hash; if (tcp_v4_md5_hash_headers(hp, daddr, saddr, th, skb->len)) goto clear_hash; if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) goto clear_hash; if (tcp_md5_hash_key(hp, key)) goto clear_hash; ahash_request_set_crypt(req, NULL, md5_hash, 0); if (crypto_ahash_final(req)) goto clear_hash; tcp_put_md5sig_pool(); return 0; clear_hash: tcp_put_md5sig_pool(); clear_hash_noput: memset(md5_hash, 0, 16); return 1; }

Contributors

PersonTokensPropCommitsCommitProp
adam langleyadam langley13058.30%116.67%
hideaki yoshifujihideaki yoshifuji6428.70%116.67%
herbert xuherbert xu198.52%116.67%
eric dumazeteric dumazet104.48%350.00%
Total223100.00%6100.00%

EXPORT_SYMBOL(tcp_v4_md5_hash_skb); #endif /* Called with rcu_read_lock() */
static bool tcp_v4_inbound_md5_hash(const struct sock *sk, const struct sk_buff *skb) { #ifdef CONFIG_TCP_MD5SIG /* * This gets called for each TCP segment that arrives * so we want to be efficient. * We have 3 drop cases: * o No MD5 hash and one expected. * o MD5 hash and we're not expecting one. * o MD5 hash and its wrong. */ const __u8 *hash_location = NULL; struct tcp_md5sig_key *hash_expected; const struct iphdr *iph = ip_hdr(skb); const struct tcphdr *th = tcp_hdr(skb); int genhash; unsigned char newhash[16]; hash_expected = tcp_md5_do_lookup(sk, (union tcp_md5_addr *)&iph->saddr, AF_INET); hash_location = tcp_parse_md5sig_option(th); /* We've parsed the options - do we have a hash? */ if (!hash_expected && !hash_location) return false; if (hash_expected && !hash_location) { NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); return true; } if (!hash_expected && hash_location) { NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); return true; } /* Okay, so this is hash_expected and hash_location - * so we need to calculate the checksum. */ genhash = tcp_v4_md5_hash_skb(newhash, hash_expected, NULL, skb); if (genhash || memcmp(hash_location, newhash, 16) != 0) { net_info_ratelimited("MD5 Hash failed for (%pI4, %d)->(%pI4, %d)%s\n", &iph->saddr, ntohs(th->source), &iph->daddr, ntohs(th->dest), genhash ? " tcp_v4_calc_md5_hash failed" : ""); return true; } return false; #endif return false; }

Contributors

PersonTokensPropCommitsCommitProp
hideaki yoshifujihideaki yoshifuji17477.33%212.50%
eric dumazeteric dumazet2912.89%743.75%
arnaldo carvalho de meloarnaldo carvalho de melo73.11%212.50%
david s. millerdavid s. miller62.67%16.25%
pre-gitpre-git31.33%16.25%
harvey harrisonharvey harrison31.33%16.25%
adam langleyadam langley20.89%16.25%
joe perchesjoe perches10.44%16.25%
Total225100.00%16100.00%


static void tcp_v4_init_req(struct request_sock *req, const struct sock *sk_listener, struct sk_buff *skb) { struct inet_request_sock *ireq = inet_rsk(req); sk_rcv_saddr_set(req_to_sk(req), ip_hdr(skb)->daddr); sk_daddr_set(req_to_sk(req), ip_hdr(skb)->saddr); ireq->no_srccheck = inet_sk(sk_listener)->transparent; ireq->opt = tcp_v4_save_options(skb); }

Contributors

PersonTokensPropCommitsCommitProp
octavian purdilaoctavian purdila6376.83%133.33%
eric dumazeteric dumazet1923.17%266.67%
Total82100.00%3100.00%


static struct dst_entry *tcp_v4_route_req(const struct sock *sk, struct flowi *fl, const struct request_sock *req, bool *strict) { struct dst_entry *dst = inet_csk_route_req(sk, &fl->u.ip4, req); if (strict) { if (fl->u.ip4.daddr == inet_rsk(req)->ir_rmt_addr) *strict = true; else *strict = false; } return dst; }

Contributors

PersonTokensPropCommitsCommitProp
octavian purdilaoctavian purdila8498.82%150.00%
eric dumazeteric dumazet11.18%150.00%
Total85100.00%2100.00%

struct request_sock_ops tcp_request_sock_ops __read_mostly = { .family = PF_INET, .obj_size = sizeof(struct tcp_request_sock), .rtx_syn_ack = tcp_rtx_synack, .send_ack = tcp_v4_reqsk_send_ack, .destructor = tcp_v4_reqsk_destructor, .send_reset = tcp_v4_send_reset, .syn_ack_timeout = tcp_syn_ack_timeout, }; static const struct tcp_request_sock_ops tcp_request_sock_ipv4_ops = { .mss_clamp = TCP_MSS_DEFAULT, #ifdef CONFIG_TCP_MD5SIG .req_md5_lookup = tcp_v4_md5_lookup, .calc_md5_hash = tcp_v4_md5_hash_skb, #endif .init_req = tcp_v4_init_req, #ifdef CONFIG_SYN_COOKIES .cookie_init_seq = cookie_v4_init_sequence, #endif .route_req = tcp_v4_route_req, .init_seq = tcp_v4_init_sequence, .send_synack = tcp_v4_send_synack, };
int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb) { /* Never answer to SYNs send to broadcast or multicast */ if (skb_rtable(skb)->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) goto drop; return tcp_conn_request(&tcp_request_sock_ops, &tcp_request_sock_ipv4_ops, sk, skb); drop: tcp_listendrop(sk); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git3967.24%430.77%
eric dumazeteric dumazet46.90%215.38%
octavian purdilaoctavian purdila46.90%215.38%
vijay subramanianvijay subramanian46.90%17.69%
paul moorepaul moore35.17%17.69%
arnaldo carvalho de meloarnaldo carvalho de melo35.17%215.38%
hannes frederic sowahannes frederic sowa11.72%17.69%
Total58100.00%13100.00%

EXPORT_SYMBOL(tcp_v4_conn_request); /* * The three way handshake has completed - we got a valid synack - * now create the new socket. */
struct sock *tcp_v4_syn_recv_sock(const struct sock *sk, struct sk_buff *skb, struct request_sock *req, struct dst_entry *dst, struct request_sock *req_unhash, bool *own_req) { struct inet_request_sock *ireq; struct inet_sock *newinet; struct tcp_sock *newtp; struct sock *newsk; #ifdef CONFIG_TCP_MD5SIG struct tcp_md5sig_key *key; #endif struct ip_options_rcu *inet_opt; if (sk_acceptq_is_full(sk)) goto exit_overflow; newsk = tcp_create_openreq_child(sk, req, skb); if (!newsk) goto exit_nonewsk; newsk->sk_gso_type = SKB_GSO_TCPV4; inet_sk_rx_dst_set(newsk, skb); newtp = tcp_sk(newsk); newinet = inet_sk(newsk); ireq = inet_rsk(req); sk_daddr_set(newsk, ireq->ir_rmt_addr); sk_rcv_saddr_set(newsk, ireq->ir_loc_addr); newsk->sk_bound_dev_if = ireq->ir_iif; newinet->inet_saddr = ireq->ir_loc_addr; inet_opt = ireq->opt; rcu_assign_pointer(newinet->inet_opt, inet_opt); ireq->opt = NULL; newinet->mc_index = inet_iif(skb); newinet->mc_ttl = ip_hdr(skb)->ttl; newinet->rcv_tos = ip_hdr(skb)->tos; inet_csk(newsk)->icsk_ext_hdr_len = 0; if (inet_opt) inet_csk(newsk)->icsk_ext_hdr_len = inet_opt->opt.optlen; newinet->inet_id = newtp->write_seq ^ jiffies; if (!dst) { dst = inet_csk_route_child_sock(sk, newsk, req); if (!dst) goto put_and_exit; } else { /* syncookie case : see end of cookie_v4_check() */ } sk_setup_caps(newsk, dst); tcp_ca_openreq_child(newsk, dst); tcp_sync_mss(newsk, dst_mtu(dst)); newtp->advmss = dst_metric_advmss(dst); if (tcp_sk(sk)->rx_opt.user_mss && tcp_sk(sk)->rx_opt.user_mss < newtp->advmss) newtp->advmss = tcp_sk(sk)->rx_opt.user_mss; tcp_initialize_rcv_mss(newsk); #ifdef CONFIG_TCP_MD5SIG /* Copy over the MD5 key from the original socket */ key = tcp_md5_do_lookup(sk, (union tcp_md5_addr *)&newinet->inet_daddr, AF_INET); if (key) { /* * We're using one, so create a matching key * on the newsk structure. If we fail to get * memory, then we end up not copying the key * across. Shucks. */ tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newinet->inet_daddr, AF_INET, key->key, key->keylen, GFP_ATOMIC); sk_nocaps_add(newsk, NETIF_F_GSO_MASK); } #endif if (__inet_inherit_port(sk, newsk) < 0) goto put_and_exit; *own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash)); if (*own_req) tcp_move_syn(newtp, req); return newsk; exit_overflow: NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); exit_nonewsk: dst_release(dst); exit: tcp_listendrop(sk); return NULL; put_and_exit: inet_csk_prepare_forced_close(newsk); tcp_done(newsk); goto exit; }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git14828.79%1323.21%
eric dumazeteric dumazet11522.37%1526.79%
david s. millerdavid s. miller5310.31%47.14%
hideaki yoshifujihideaki yoshifuji407.78%23.57%
tom quetchenbachtom quetchenbach377.20%11.79%
arnaldo carvalho de meloarnaldo carvalho de melo356.81%814.29%
balazs scheidlerbalazs scheidler203.89%11.79%
jiri bencjiri benc112.14%11.79%
david aherndavid ahern81.56%11.79%
linus torvaldslinus torvalds81.56%11.79%
pavel emelianovpavel emelianov81.56%11.79%
neal cardwellneal cardwell71.36%11.79%
herbert xuherbert xu71.36%23.57%
daniel borkmanndaniel borkmann71.36%11.79%
alexey kuznetsovalexey kuznetsov40.78%11.79%
adam langleyadam langley30.58%11.79%
christoph paaschchristoph paasch20.39%11.79%
john dykstrajohn dykstra10.19%11.79%
Total514100.00%56100.00%

EXPORT_SYMBOL(tcp_v4_syn_recv_sock);
static struct sock *tcp_v4_cookie_check(struct sock *sk, struct sk_buff *skb) { #ifdef CONFIG_SYN_COOKIES const struct tcphdr *th = tcp_hdr(skb); if (!th->syn) sk = cookie_v4_check(sk, skb); #endif return sk; }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git4584.91%350.00%
eric dumazeteric dumazet59.43%233.33%
arnaldo carvalho de meloarnaldo carvalho de melo35.66%116.67%
Total53100.00%6100.00%

/* The socket must have it's spinlock held when we get * here, unless it is a TCP_LISTEN socket. * * We have a potential double-lock case here, so even when * doing backlog processing we use the BH locking scheme. * This is because we cannot sleep with the original spinlock * held. */
int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb) { struct sock *rsk; if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ struct dst_entry *dst = sk->sk_rx_dst; sock_rps_save_rxhash(sk, skb); sk_mark_napi_id(sk, skb); if (dst) { if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif || !dst->ops->check(dst, 0)) { dst_release(dst); sk->sk_rx_dst = NULL; } } tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len); return 0; } if (tcp_checksum_complete(skb)) goto csum_err; if (sk->sk_state == TCP_LISTEN) { struct sock *nsk = tcp_v4_cookie_check(sk, skb); if (!nsk) goto discard; if (nsk != sk) { sock_rps_save_rxhash(nsk, skb); sk_mark_napi_id(nsk, skb); if (tcp_child_process(sk, nsk, skb)) { rsk = nsk; goto reset; } return 0; } } else sock_rps_save_rxhash(sk, skb); if (tcp_rcv_state_process(sk, skb)) { rsk = sk; goto reset; } return 0; reset: tcp_v4_send_reset(rsk, skb); discard: kfree_skb(skb); /* Be careful here. If this function gets more complicated and * gcc suffers from register pressure on the x86, sk (in %ebx) * might be destroyed here. This current version compiles correctly, * but you have been warned. */ return 0; csum_err: TCP_INC_STATS(sock_net(sk), TCP_MIB_CSUMERRORS); TCP_INC_STATS(sock_net(sk), TCP_MIB_INERRS); goto discard; }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git14552.54%934.62%
eric dumazeteric dumazet6925.00%934.62%
david s. millerdavid s. miller2910.51%13.85%
hideaki yoshifujihideaki yoshifuji217.61%27.69%
arnaldo carvalho de meloarnaldo carvalho de melo62.17%311.54%
pavel emelianovpavel emelianov51.81%13.85%
ian morrisian morris10.36%13.85%
Total276100.00%26100.00%

EXPORT_SYMBOL(tcp_v4_do_rcv);
void tcp_v4_early_demux(struct sk_buff *skb) { const struct iphdr *iph; const struct tcphdr *th; struct sock *sk; if (skb->pkt_type != PACKET_HOST) return; if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr))) return; iph = ip_hdr(skb); th = tcp_hdr(skb); if (th->doff < sizeof(struct tcphdr) / 4) return; sk = __inet_lookup_established(dev_net(skb->dev), &tcp_hashinfo, iph->saddr, th->source, iph->daddr, ntohs(th->dest), skb->skb_iif); if (sk) { skb->sk = sk; skb->destructor = sock_edemux; if (sk_fullsock(sk)) { struct dst_entry *dst = READ_ONCE(sk->sk_rx_dst); if (dst) dst = dst_check(dst, 0); if (dst && inet_sk(sk)->rx_dst_ifindex == skb->skb_iif) skb_dst_set_noref(skb, dst); } } }

Contributors

PersonTokensPropCommitsCommitProp
david s. millerdavid s. miller17287.31%440.00%
eric dumazeteric dumazet199.64%440.00%
vijay subramanianvijay subramanian31.52%110.00%
michal kubecekmichal kubecek31.52%110.00%
Total197100.00%10100.00%

/* Packet is added to VJ-style prequeue for processing in process * context, if a reader task is waiting. Apparently, this exciting * idea (VJ's mail "Re: query about TCP header on tcp-ip" of 07 Sep 93) * failed somewhere. Latency? Burstiness? Well, at least now we will * see, why it failed. 8)8) --ANK * */
bool tcp_prequeue(struct sock *sk, struct sk_buff *skb) { struct tcp_sock *tp = tcp_sk(sk); if (sysctl_tcp_low_latency || !tp->ucopy.task) return false; if (skb->len <= tcp_hdrlen(skb) && skb_queue_len(&tp->ucopy.prequeue) == 0) return false; /* Before escaping RCU protected region, we need to take care of skb * dst. Prequeue is only enabled for established sockets. * For such sockets, we might need the skb dst only to set sk->sk_rx_dst * Instead of doing full sk_rx_dst validity here, let's perform * an optimistic check. */ if (likely(sk->sk_rx_dst)) skb_dst_drop(skb); else skb_dst_force_safe(skb); __skb_queue_tail(&tp->ucopy.prequeue, skb); tp->ucopy.memory += skb->truesize; if (skb_queue_len(&tp->ucopy.prequeue) >= 32 || tp->ucopy.memory + atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf) { struct sk_buff *skb1; BUG_ON(sock_owned_by_user(sk)); __NET_ADD_STATS(sock_net(sk), LINUX_MIB_TCPPREQUEUEDROPPED, skb_queue_len(&tp->ucopy.prequeue)); while ((skb1 = __skb_dequeue(&tp->ucopy.prequeue)) != NULL) sk_backlog_rcv(sk, skb1); tp->ucopy.memory = 0; } else if (skb_queue_len(&tp->ucopy.prequeue) == 1) { wake_up_interruptible_sync_poll(sk_sleep(sk), POLLIN | POLLRDNORM | POLLRDBAND); if (!inet_csk_ack_scheduled(sk)) inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK, (3 * tcp_rto_min(sk)) / 4, TCP_RTO_MAX); } return true; }

Contributors

PersonTokensPropCommitsCommitProp
eric dumazeteric dumazet26698.52%480.00%
david s. millerdavid s. miller41.48%120.00%
Total270100.00%5100.00%

EXPORT_SYMBOL(tcp_prequeue); /* * From tcp_input.c */
int tcp_v4_rcv(struct sk_buff *skb) { struct net *net = dev_net(skb->dev); const struct iphdr *iph; const struct tcphdr *th; bool refcounted; struct sock *sk; int ret; if (skb->pkt_type != PACKET_HOST) goto discard_it; /* Count it even if it's bad */ __TCP_INC_STATS(net, TCP_MIB_INSEGS); if (!pskb_may_pull(skb, sizeof(struct tcphdr))) goto discard_it; th = (const struct tcphdr *)skb->data; if (unlikely(th->doff < sizeof(struct tcphdr) / 4)) goto bad_packet; if (!pskb_may_pull(skb, th->doff * 4)) goto discard_it; /* An explanation is required here, I think. * Packet length and doff are validated by header prediction, * provided case of th->doff==0 is eliminated. * So, we defer the checks. */ if (skb_checksum_init(skb, IPPROTO_TCP, inet_compute_pseudo)) goto csum_error; th = (const struct tcphdr *)skb->data; iph = ip_hdr(skb); /* This is tricky : We move IPCB at its correct location into TCP_SKB_CB() * barrier() makes sure compiler wont play fool^Waliasing games. */ memmove(&TCP_SKB_CB(skb)->header.h4, IPCB(skb), sizeof(struct inet_skb_parm)); barrier(); TCP_SKB_CB(skb)->seq = ntohl(th->seq); TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + skb->len - th->doff * 4); TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); TCP_SKB_CB(skb)->tcp_flags = tcp_flag_byte(th); TCP_SKB_CB(skb)->tcp_tw_isn = 0; TCP_SKB_CB(skb)->ip_dsfield = ipv4_get_dsfield(iph); TCP_SKB_CB(skb)->sacked = 0; lookup: sk = __inet_lookup_skb(&tcp_hashinfo, skb, __tcp_hdrlen(th), th->source, th->dest, &refcounted); if (!sk) goto no_tcp_socket; process: if (sk->sk_state == TCP_TIME_WAIT) goto do_time_wait; if (sk->sk_state == TCP_NEW_SYN_RECV) { struct request_sock *req = inet_reqsk(sk); struct sock *nsk; sk = req->rsk_listener; if (unlikely(tcp_v4_inbound_md5_hash(sk, skb))) { reqsk_put(req); goto discard_it; } if (unlikely(sk->sk_state != TCP_LISTEN)) { inet_csk_reqsk_queue_drop_and_put(sk, req); goto lookup; } /* We own a reference on the listener, increase it again * as we might lose it too soon. */ sock_hold(sk); refcounted = true; nsk = tcp_check_req(sk, skb, req, false); if (!nsk) { reqsk_put(req); goto discard_and_relse; } if (nsk == sk) { reqsk_put(req); } else if (tcp_child_process(sk, nsk, skb)) { tcp_v4_send_reset(nsk, skb); goto discard_and_relse; } else { sock_put(sk); return 0; } } if (unlikely(iph->ttl < inet_sk(sk)->min_ttl)) { __NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP); goto discard_and_relse; } if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) goto discard_and_relse; if (tcp_v4_inbound_md5_hash(sk, skb)) goto discard_and_relse; nf_reset(skb); if (sk_filter(sk, skb)) goto discard_and_relse; skb->dev = NULL; if (sk->sk_state == TCP_LISTEN) { ret = tcp_v4_do_rcv(sk, skb); goto put_and_return; } sk_incoming_cpu_update(sk); bh_lock_sock_nested(sk); tcp_segs_in(tcp_sk(sk), skb); ret = 0; if (!sock_owned_by_user(sk)) { if (!tcp_prequeue(sk, skb)) ret = tcp_v4_do_rcv(sk, skb); } else if (unlikely(sk_add_backlog(sk, skb, sk->sk_rcvbuf + sk->sk_sndbuf))) { bh_unlock_sock(sk); __NET_INC_STATS(net, LINUX_MIB_TCPBACKLOGDROP); goto discard_and_relse; } bh_unlock_sock(sk); put_and_return: if (refcounted) sock_put(sk); return ret; no_tcp_socket: if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) goto discard_it; if (tcp_checksum_complete(skb)) { csum_error: __TCP_INC_STATS(net, TCP_MIB_CSUMERRORS); bad_packet: __TCP_INC_STATS(net, TCP_MIB_INERRS); } else { tcp_v4_send_reset(NULL, skb); } discard_it: /* Discard frame. */ kfree_skb(skb); return 0; discard_and_relse: sk_drops_add(sk, skb); if (refcounted) sock_put(sk); goto discard_it; do_time_wait: if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) { inet_twsk_put(inet_twsk(sk)); goto discard_it; } if (tcp_checksum_complete(skb)) { inet_twsk_put(inet_twsk(sk)); goto csum_error; } switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { case TCP_TW_SYN: { struct sock *sk2 = inet_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, skb, __tcp_hdrlen(th), iph->saddr, th->source, iph->daddr, th->dest, inet_iif(skb)); if (sk2) { inet_twsk_deschedule_put(inet_twsk(sk)); sk = sk2; refcounted = false; goto process; } /* Fall through to ACK */ } case TCP_TW_ACK: tcp_v4_timewait_ack(sk, skb); break; case TCP_TW_RST: tcp_v4_send_reset(sk, skb); inet_twsk_deschedule_put(inet_twsk(sk)); goto discard_it; case TCP_TW_SUCCESS:; } goto discard_it; }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git36437.07%1522.06%
eric dumazeteric dumazet35235.85%2130.88%
linus torvaldslinus torvalds484.89%11.47%
alexey kuznetsovalexey kuznetsov353.56%11.47%
arnaldo carvalho de meloarnaldo carvalho de melo272.75%710.29%
hideaki yoshifujihideaki yoshifuji222.24%57.35%
stephen hemmingerstephen hemminger171.73%22.94%
florian westphalflorian westphal161.63%11.47%
yi zhuyi zhu141.43%22.94%
tom herberttom herbert131.32%22.94%
dmitry popovdmitry popov121.22%11.47%
james morrisjames morris121.22%11.47%
craig gallekcraig gallek121.22%11.47%
nivedita singhvinivedita singhvi111.12%11.47%
pavel emelianovpavel emelianov80.81%22.94%
marcelo ricardo leitnermarcelo ricardo leitner80.81%11.47%
patrick mchardypatrick mchardy50.51%11.47%
benjamin lahaisebenjamin lahaise30.31%11.47%
martin kafai laumartin kafai lau20.20%11.47%
ingo molnaringo molnar10.10%11.47%
Total982100.00%68100.00%

static struct timewait_sock_ops tcp_timewait_sock_ops = { .twsk_obj_size = sizeof(struct tcp_timewait_sock), .twsk_unique = tcp_twsk_unique, .twsk_destructor= tcp_twsk_destructor, };
void inet_sk_rx_dst_set(struct sock *sk, const struct sk_buff *skb) { struct dst_entry *dst = skb_dst(skb); if (dst && dst_hold_safe(dst)) { sk->sk_rx_dst = dst; inet_sk(sk)->rx_dst_ifindex = skb->skb_iif; } }

Contributors

PersonTokensPropCommitsCommitProp
eric dumazeteric dumazet54100.00%3100.00%
Total54100.00%3100.00%

EXPORT_SYMBOL(inet_sk_rx_dst_set); const struct inet_connection_sock_af_ops ipv4_specific = { .queue_xmit = ip_queue_xmit, .send_check = tcp_v4_send_check, .rebuild_header = inet_sk_rebuild_header, .sk_rx_dst_set = inet_sk_rx_dst_set, .conn_request = tcp_v4_conn_request, .syn_recv_sock = tcp_v4_syn_recv_sock, .net_header_len = sizeof(struct iphdr), .setsockopt = ip_setsockopt, .getsockopt = ip_getsockopt, .addr2sockaddr = inet_csk_addr2sockaddr, .sockaddr_len = sizeof(struct sockaddr_in), .bind_conflict = inet_csk_bind_conflict, #ifdef CONFIG_COMPAT .compat_setsockopt = compat_ip_setsockopt, .compat_getsockopt = compat_ip_getsockopt, #endif .mtu_reduced = tcp_v4_mtu_reduced, }; EXPORT_SYMBOL(ipv4_specific); #ifdef CONFIG_TCP_MD5SIG static const struct tcp_sock_af_ops tcp_sock_ipv4_specific = { .md5_lookup = tcp_v4_md5_lookup, .calc_md5_hash = tcp_v4_md5_hash_skb, .md5_parse = tcp_v4_parse_md5_keys, }; #endif /* NOTE: A lot of things set to zero explicitly by call to * sk_alloc() so need not be done here. */
static int tcp_v4_init_sock(struct sock *sk) { struct inet_connection_sock *icsk = inet_csk(sk); tcp_init_sock(sk); icsk->icsk_af_ops = &ipv4_specific; #ifdef CONFIG_TCP_MD5SIG tcp_sk(sk)->af_specific = &tcp_sock_ipv4_specific; #endif return 0; }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git2141.18%112.50%
hideaki yoshifujihideaki yoshifuji1121.57%112.50%
arnaldo carvalho de meloarnaldo carvalho de melo1121.57%225.00%
david s. millerdavid s. miller47.84%112.50%
linus torvaldslinus torvalds23.92%112.50%
thomas grafthomas graf11.96%112.50%
neal cardwellneal cardwell11.96%112.50%
Total51100.00%8100.00%


void tcp_v4_destroy_sock(struct sock *sk) { struct tcp_sock *tp = tcp_sk(sk); tcp_clear_xmit_timers(sk); tcp_cleanup_congestion_control(sk); /* Cleanup up the write buffer. */ tcp_write_queue_purge(sk); /* Cleans up our, hopefully empty, out_of_order_queue. */ __skb_queue_purge(&tp->out_of_order_queue); #ifdef CONFIG_TCP_MD5SIG /* Clean up the MD5 key list, if any */ if (tp->md5sig_info) { tcp_clear_md5_list(sk); kfree_rcu(tp->md5sig_info, rcu); tp->md5sig_info = NULL; } #endif /* Clean prequeue, it must be empty really */ __skb_queue_purge(&tp->ucopy.prequeue); /* Clean up a referenced TCP bind bucket. */ if (inet_csk(sk)->icsk_bind_hash) inet_put_port(sk); BUG_ON(tp->fastopen_rsk); /* If socket is aborted during connect operation */ tcp_free_fastopen_req(tp); tcp_saved_syn_free(tp); local_bh_disable(); sk_sockets_allocated_dec(sk); local_bh_enable(); if (mem_cgroup_sockets_enabled && sk->sk_memcg) sock_release_memcg(sk); }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git5638.10%621.43%
hideaki yoshifujihideaki yoshifuji2819.05%13.57%
eric dumazeteric dumazet1510.20%414.29%
arnaldo carvalho de meloarnaldo carvalho de melo85.44%517.86%
johannes weinerjohannes weiner85.44%27.14%
jerry chujerry chu74.76%13.57%
glauber costaglauber costa74.76%27.14%
yuchung chengyuchung cheng64.08%13.57%
david s. millerdavid s. miller42.72%27.14%
stephen hemmingerstephen hemminger42.72%13.57%
chris leechchris leech21.36%13.57%
linus torvaldslinus torvalds10.68%13.57%
brian haleybrian haley10.68%13.57%
Total147100.00%28100.00%

EXPORT_SYMBOL(tcp_v4_destroy_sock); #ifdef CONFIG_PROC_FS /* Proc filesystem TCP sock list dumping. */ /* * Get next listener socket follow cur. If cur is NULL, get first socket * starting from bucket given in st->bucket; when st->bucket is zero the * very first socket in the hash table is returned. */
static void *listening_get_next(struct seq_file *seq, void *cur) { struct tcp_iter_state *st = seq->private; struct net *net = seq_file_net(seq); struct inet_listen_hashbucket *ilb; struct inet_connection_sock *icsk; struct sock *sk = cur; if (!sk) { get_head: ilb = &tcp_hashinfo.listening_hash[st->bucket]; spin_lock_bh(&ilb->lock); sk = sk_head(&ilb->head); st->offset = 0; goto get_sk; } ilb = &tcp_hashinfo.listening_hash[st->bucket]; ++st->num; ++st->offset; sk = sk_next(sk); get_sk: sk_for_each_from(sk) { if (!net_eq(sock_net(sk), net)) continue; if (sk->sk_family == st->family) return sk; icsk = inet_csk(sk); } spin_unlock_bh(&ilb->lock); st->offset = 0; if (++st->bucket < INET_LHTABLE_SIZE) goto get_head; return NULL; }

Contributors

PersonTokensPropCommitsCommitProp
eric dumazeteric dumazet9045.00%316.67%
arnaldo carvalho de meloarnaldo carvalho de melo5527.50%527.78%
pre-gitpre-git168.00%211.11%
pavel emelianovpavel emelianov126.00%15.56%
herbert xuherbert xu115.50%211.11%
hideaki yoshifujihideaki yoshifuji73.50%211.11%
tom herberttom herbert63.00%15.56%
daniel lezcanodaniel lezcano21.00%15.56%
david s. millerdavid s. miller10.50%15.56%
Total200100.00%18100.00%


static void *listening_get_idx(struct seq_file *seq, loff_t *pos) { struct tcp_iter_state *st = seq->private; void *rc; st->bucket = 0; st->offset = 0; rc = listening_get_next(seq, NULL); while (rc && *pos) { rc = listening_get_next(seq, rc); --*pos; } return rc; }

Contributors

PersonTokensPropCommitsCommitProp
arnaldo carvalho de meloarnaldo carvalho de melo4154.67%125.00%
tom herberttom herbert2533.33%125.00%
tim shepardtim shepard68.00%125.00%
herbert xuherbert xu34.00%125.00%
Total75100.00%4100.00%


static inline bool empty_bucket(const struct tcp_iter_state *st) { return hlist_nulls_empty(&tcp_hashinfo.ehash[st->bucket].chain); }

Contributors

PersonTokensPropCommitsCommitProp
andi kleenandi kleen2689.66%125.00%
eric dumazeteric dumazet310.34%375.00%
Total29100.00%4100.00%

/* * Get first established socket starting from bucket given in st->bucket. * If st->bucket is zero, the very first socket in the hash is returned. */
static void *established_get_first(struct seq_file *seq) { struct tcp_iter_state *st = seq->private; struct net *net = seq_file_net(seq); void *rc = NULL; st->offset = 0; for (; st->bucket <= tcp_hashinfo.ehash_mask; ++st->bucket) { struct sock *sk; struct hlist_nulls_node *node; spinlock_t *lock = inet_ehash_lockp(&tcp_hashinfo, st->bucket); /* Lockless fast path for the common case of empty buckets */ if (empty_bucket(st)) continue; spin_lock_bh(lock); sk_nulls_for_each(sk, node, &tcp_hashinfo.ehash[st->bucket].chain) { if (sk->sk_family != st->family || !net_eq(sock_net(sk), net)) { continue; } rc = sk; goto out; } spin_unlock_bh(lock); } out: return rc; }

Contributors

PersonTokensPropCommitsCommitProp
arnaldo carvalho de meloarnaldo carvalho de melo7348.67%422.22%
pre-gitpre-git2416.00%316.67%
eric dumazeteric dumazet1510.00%422.22%
hideaki yoshifujihideaki yoshifuji128.00%316.67%
daniel lezcanodaniel lezcano96.00%15.56%
andi kleenandi kleen96.00%15.56%
denis v. lunevdenis v. lunev42.67%15.56%
tom herberttom herbert42.67%15.56%
Total150100.00%18100.00%


static void *established_get_next(struct seq_file *seq, void *cur) { struct sock *sk = cur; struct hlist_nulls_node *node; struct tcp_iter_state *st = seq->private; struct net *net = seq_file_net(seq); ++st->num; ++st->offset; sk = sk_nulls_next(sk); sk_nulls_for_each_from(sk, node) { if (sk->sk_family == st->family && net_eq(sock_net(sk), net)) return sk; } spin_unlock_bh(inet_ehash_lockp(&tcp_hashinfo, st->bucket)); ++st->bucket; return established_get_first(seq); }

Contributors

PersonTokensPropCommitsCommitProp
arnaldo carvalho de meloarnaldo carvalho de melo6756.30%430.77%
eric dumazeteric dumazet1915.97%215.38%
hideaki yoshifujihideaki yoshifuji108.40%323.08%
daniel lezcanodaniel lezcano97.56%17.69%
tom herberttom herbert54.20%17.69%
tim shepardtim shepard54.20%17.69%
denis v. lunevdenis v. lunev43.36%17.69%
Total119100.00%13100.00%


static void *established_get_idx(struct seq_file *seq, loff_t pos) { struct tcp_iter_state *st = seq->private; void *rc; st->bucket = 0; rc = established_get_first(seq); while (rc && pos) { rc = established_get_next(seq, rc); --pos; } return rc; }

Contributors

PersonTokensPropCommitsCommitProp
arnaldo carvalho de meloarnaldo carvalho de melo3960.94%133.33%
tom herberttom herbert1929.69%133.33%
tim shepardtim shepard69.38%133.33%
Total64100.00%3100.00%


static void *tcp_get_idx(struct seq_file *seq, loff_t pos) { void *rc; struct tcp_iter_state *st = seq->private; st->state = TCP_SEQ_STATE_LISTENING; rc = listening_get_idx(seq, &pos); if (!rc) { st->state = TCP_SEQ_STATE_ESTABLISHED; rc = established_get_idx(seq, pos); } return rc; }

Contributors

PersonTokensPropCommitsCommitProp
arnaldo carvalho de meloarnaldo carvalho de melo69100.00%1100.00%
Total69100.00%1100.00%


static void *tcp_seek_last_pos(struct seq_file *seq) { struct tcp_iter_state *st = seq->private; int offset = st->offset; int orig_num = st->num; void *rc = NULL; switch (st->state) { case TCP_SEQ_STATE_LISTENING: if (st->bucket >= INET_LHTABLE_SIZE) break; st->state = TCP_SEQ_STATE_LISTENING; rc = listening_get_next(seq, NULL); while (offset-- && rc) rc = listening_get_next(seq, rc); if (rc) break; st->bucket = 0; st->state = TCP_SEQ_STATE_ESTABLISHED; /* Fallthrough */ case TCP_SEQ_STATE_ESTABLISHED: if (st->bucket > tcp_hashinfo.ehash_mask) break; rc = established_get_first(seq); while (offset-- && rc) rc = established_get_next(seq, rc); } st->num = orig_num; return rc; }

Contributors

PersonTokensPropCommitsCommitProp
tom herberttom herbert15297.44%150.00%
eric dumazeteric dumazet42.56%150.00%
Total156100.00%2100.00%


static void *tcp_seq_start(struct seq_file *seq, loff_t *pos) { struct tcp_iter_state *st = seq->private; void *rc; if (*pos && *pos == st->last_pos) { rc = tcp_seek_last_pos(seq); if (rc) goto out; } st->state = TCP_SEQ_STATE_LISTENING; st->num = 0; st->bucket = 0; st->offset = 0; rc = *pos ? tcp_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; out: st->last_pos = *pos; return rc; }

Contributors

PersonTokensPropCommitsCommitProp
tom herberttom herbert5852.73%120.00%
arnaldo carvalho de meloarnaldo carvalho de melo3027.27%120.00%
tim shepardtim shepard1513.64%120.00%
hirofumi ogawahirofumi ogawa65.45%120.00%
joe perchesjoe perches10.91%120.00%
Total110100.00%5100.00%


static void *tcp_seq_next(struct seq_file *seq, void *v, loff_t *pos) { struct tcp_iter_state *st = seq->private; void *rc = NULL; if (v == SEQ_START_TOKEN) { rc = tcp_get_idx(seq, 0); goto out; } switch (st->state) { case TCP_SEQ_STATE_LISTENING: rc = listening_get_next(seq, v); if (!rc) { st->state = TCP_SEQ_STATE_ESTABLISHED; st->bucket = 0; st->offset = 0; rc = established_get_first(seq); } break; case TCP_SEQ_STATE_ESTABLISHED: rc = established_get_next(seq, v); break; } out: ++*pos; st->last_pos = *pos; return rc; }

Contributors

PersonTokensPropCommitsCommitProp
arnaldo carvalho de meloarnaldo carvalho de melo10878.83%133.33%
tom herberttom herbert2820.44%133.33%
joe perchesjoe perches10.73%133.33%
Total137100.00%3100.00%


static void tcp_seq_stop(struct seq_file *seq, void *v) { struct tcp_iter_state *st = seq->private; switch (st->state) { case TCP_SEQ_STATE_LISTENING: if (v != SEQ_START_TOKEN) spin_unlock_bh(&tcp_hashinfo.listening_hash[st->bucket].lock); break; case TCP_SEQ_STATE_ESTABLISHED: if (v) spin_unlock_bh(inet_ehash_lockp(&tcp_hashinfo, st->bucket)); break; } }

Contributors

PersonTokensPropCommitsCommitProp
arnaldo carvalho de meloarnaldo carvalho de melo5773.08%337.50%
eric dumazeteric dumazet1519.23%337.50%
anders gustafssonanders gustafsson56.41%112.50%
joe perchesjoe perches11.28%112.50%
Total78100.00%8100.00%


int tcp_seq_open(struct inode *inode, struct file *file) { struct tcp_seq_afinfo *afinfo = PDE_DATA(inode); struct tcp_iter_state *s; int err; err = seq_open_net(inode, file, &afinfo->seq_ops, sizeof(struct tcp_iter_state)); if (err < 0) return err; s = ((struct seq_file *)file->private_data)->private; s->family = afinfo->family; s->last_pos = 0; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
hideaki yoshifujihideaki yoshifuji3840.43%225.00%
denis v. lunevdenis v. lunev3031.91%225.00%
arnaldo carvalho de meloarnaldo carvalho de melo1010.64%112.50%
daniel lezcanodaniel lezcano99.57%112.50%
tom herberttom herbert66.38%112.50%
al viroal viro11.06%112.50%
Total94100.00%8100.00%

EXPORT_SYMBOL(tcp_seq_open);
int tcp_proc_register(struct net *net, struct tcp_seq_afinfo *afinfo) { int rc = 0; struct proc_dir_entry *p; afinfo->seq_ops.start = tcp_seq_start; afinfo->seq_ops.next = tcp_seq_next; afinfo->seq_ops.stop = tcp_seq_stop; p = proc_create_data(afinfo->name, S_IRUGO, net->proc_net, afinfo->seq_fops, afinfo); if (!p) rc = -ENOMEM; return rc; }

Contributors

PersonTokensPropCommitsCommitProp
hideaki yoshifujihideaki yoshifuji4857.83%240.00%
denis v. lunevdenis v. lunev3036.14%240.00%
daniel lezcanodaniel lezcano56.02%120.00%
Total83100.00%5100.00%

EXPORT_SYMBOL(tcp_proc_register);
void tcp_proc_unregister(struct net *net, struct tcp_seq_afinfo *afinfo) { remove_proc_entry(afinfo->name, net->proc_net); }

Contributors

PersonTokensPropCommitsCommitProp
hideaki yoshifujihideaki yoshifuji1661.54%133.33%
daniel lezcanodaniel lezcano519.23%133.33%
gao fenggao feng519.23%133.33%
Total26100.00%3100.00%

EXPORT_SYMBOL(tcp_proc_unregister);
static void get_openreq4(const struct request_sock *req, struct seq_file *f, int i) { const struct inet_request_sock *ireq = inet_rsk(req); long delta = req->rsk_timer.expires - jiffies; seq_printf(f, "%4d: %08X:%04X %08X:%04X" " %02X %08X:%08X %02X:%08lX %08X %5u %8d %u %d %pK", i, ireq->ir_loc_addr, ireq->ir_num, ireq->ir_rmt_addr, ntohs(ireq->ir_rmt_port), TCP_SYN_RECV, 0, 0, /* could print option size, but that is af dependent. */ 1, /* timers active (only the expire timer) */ jiffies_delta_to_clock_t(delta), req->num_timeout, from_kuid_munged(seq_user_ns(f), sock_i_uid(req->rsk_listener)), 0, /* non standard timer */ 0, /* open_requests have no inode */ 0, req); }

Contributors

PersonTokensPropCommitsCommitProp
hideaki yoshifujihideaki yoshifuji5951.30%16.67%
arnaldo carvalho de meloarnaldo carvalho de melo2017.39%320.00%
eric dumazeteric dumazet2017.39%746.67%
eric w. biedermaneric w. biederman86.96%16.67%
pavel emelianovpavel emelianov54.35%16.67%
david s. millerdavid s. miller21.74%16.67%
tetsuo handatetsuo handa10.87%16.67%
Total115100.00%15100.00%


static void get_tcp4_sock(struct sock *sk, struct seq_file *f, int i) { int timer_active; unsigned long timer_expires; const struct tcp_sock *tp = tcp_sk(sk); const struct inet_connection_sock *icsk = inet_csk(sk); const struct inet_sock *inet = inet_sk(sk); const struct fastopen_queue *fastopenq = &icsk->icsk_accept_queue.fastopenq; __be32 dest = inet->inet_daddr; __be32 src = inet->inet_rcv_saddr; __u16 destp = ntohs(inet->inet_dport); __u16 srcp = ntohs(inet->inet_sport); int rx_queue; int state; if (icsk->icsk_pending == ICSK_TIME_RETRANS || icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS || icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) { timer_active = 1; timer_expires = icsk->icsk_timeout; } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { timer_active = 4; timer_expires = icsk->icsk_timeout; } else if (timer_pending(&sk->sk_timer)) { timer_active = 2; timer_expires = sk->sk_timer.expires; } else { timer_active = 0; timer_expires = jiffies; } state = sk_state_load(sk); if (state == TCP_LISTEN) rx_queue = sk->sk_ack_backlog; else /* Because we don't lock the socket, * we might find a transient negative value. */ rx_queue = max_t(int, tp->rcv_nxt - tp->copied_seq, 0); seq_printf(f, "%4d: %08X:%04X %08X:%04X %02X %08X:%08X %02X:%08lX " "%08X %5u %8d %lu %d %pK %lu %lu %u %u %d", i, src, srcp, dest, destp, state, tp->write_seq - tp->snd_una, rx_queue, timer_active, jiffies_delta_to_clock_t(timer_expires - jiffies), icsk->icsk_retransmits, from_kuid_munged(seq_user_ns(f), sock_i_uid(sk)), icsk->icsk_probes_out, sock_i_ino(sk), atomic_read(&sk->sk_refcnt), sk, jiffies_to_clock_t(icsk->icsk_rto), jiffies_to_clock_t(icsk->icsk_ack.ato), (icsk->icsk_ack.quick << 1) | icsk->icsk_ack.pingpong, tp->snd_cwnd, state == TCP_LISTEN ? fastopenq->max_qlen : (tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh)); }

Contributors

PersonTokensPropCommitsCommitProp
arnaldo carvalho de meloarnaldo carvalho de melo24666.13%626.09%
eric dumazeteric dumazet5615.05%626.09%
jerry chujerry chu205.38%14.35%
ilpo jarvinenilpo jarvinen133.49%28.70%
nandita dukkipatinandita dukkipati123.23%14.35%
eric w. biedermaneric w. biederman82.15%14.35%
stephen hemmingerstephen hemminger61.61%14.35%
pavel emelianovpavel emelianov51.34%14.35%
david s. millerdavid s. miller20.54%14.35%
al viroal viro20.54%14.35%
hideaki yoshifujihideaki yoshifuji10.27%14.35%
tetsuo handatetsuo handa10.27%14.35%
Total372100.00%23100.00%


static void get_timewait4_sock(const struct inet_timewait_sock *tw, struct seq_file *f, int i) { long delta = tw->tw_timer.expires - jiffies; __be32 dest, src; __u16 destp, srcp; dest = tw->tw_daddr; src = tw->tw_rcv_saddr; destp = ntohs(tw->tw_dport); srcp = ntohs(tw->tw_sport); seq_printf(f, "%4d: %08X:%04X %08X:%04X" " %02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK", i, src, srcp, dest, destp, tw->tw_substate, 0, 0, 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0, atomic_read(&tw->tw_refcnt), tw); }

Contributors

PersonTokensPropCommitsCommitProp
arnaldo carvalho de meloarnaldo carvalho de melo8569.67%320.00%
eric dumazeteric dumazet1411.48%320.00%
pre-gitpre-git1310.66%426.67%
pavel emelianovpavel emelianov54.10%16.67%
david s. millerdavid s. miller21.64%16.67%
al viroal viro10.82%16.67%
tetsuo handatetsuo handa10.82%16.67%
hideaki yoshifujihideaki yoshifuji10.82%16.67%
Total122100.00%15100.00%

#define TMPSZ 150
static int tcp4_seq_show(struct seq_file *seq, void *v) { struct tcp_iter_state *st; struct sock *sk = v; seq_setwidth(seq, TMPSZ - 1); if (v == SEQ_START_TOKEN) { seq_puts(seq, " sl local_address rem_address st tx_queue " "rx_queue tr tm->when retrnsmt uid timeout " "inode"); goto out; } st = seq->private; if (sk->sk_state == TCP_TIME_WAIT) get_timewait4_sock(v, seq, st->num); else if (sk->sk_state == TCP_NEW_SYN_RECV) get_openreq4(v, seq, st->num); else get_tcp4_sock(v, seq, st->num); out: seq_pad(seq, '\n'); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
arnaldo carvalho de meloarnaldo carvalho de melo4536.00%19.09%
pre-gitpre-git3326.40%436.36%
eric dumazeteric dumazet2822.40%218.18%
tetsuo handatetsuo handa1411.20%19.09%
pavel emelianovpavel emelianov32.40%19.09%
hideaki yoshifujihideaki yoshifuji10.80%19.09%
joe perchesjoe perches10.80%19.09%
Total125100.00%11100.00%

static const struct file_operations tcp_afinfo_seq_fops = { .owner = THIS_MODULE, .open = tcp_seq_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release_net }; static struct tcp_seq_afinfo tcp4_seq_afinfo = { .name = "tcp", .family = AF_INET, .seq_fops = &tcp_afinfo_seq_fops, .seq_ops = { .show = tcp4_seq_show, }, };
static int __net_init tcp4_proc_init_net(struct net *net) { return tcp_proc_register(net, &tcp4_seq_afinfo); }

Contributors

PersonTokensPropCommitsCommitProp
pavel emelianovpavel emelianov1257.14%125.00%
arnaldo carvalho de meloarnaldo carvalho de melo628.57%125.00%
hideaki yoshifujihideaki yoshifuji29.52%125.00%
alexey dobriyanalexey dobriyan14.76%125.00%
Total21100.00%4100.00%


static void __net_exit tcp4_proc_exit_net(struct net *net) { tcp_proc_unregister(net, &tcp4_seq_afinfo); }

Contributors

PersonTokensPropCommitsCommitProp
pavel emelianovpavel emelianov1575.00%125.00%
hideaki yoshifujihideaki yoshifuji210.00%125.00%
daniel lezcanodaniel lezcano210.00%125.00%
alexey dobriyanalexey dobriyan15.00%125.00%
Total20100.00%4100.00%

static struct pernet_operations tcp4_net_ops = { .init = tcp4_proc_init_net, .exit = tcp4_proc_exit_net, };
int __init tcp4_proc_init(void) { return register_pernet_subsys(&tcp4_net_ops); }

Contributors

PersonTokensPropCommitsCommitProp
pavel emelianovpavel emelianov1386.67%150.00%
pre-gitpre-git213.33%150.00%
Total15100.00%2100.00%


void tcp4_proc_exit(void) { unregister_pernet_subsys(&tcp4_net_ops); }

Contributors

PersonTokensPropCommitsCommitProp
arnaldo carvalho de meloarnaldo carvalho de melo969.23%133.33%
pavel emelianovpavel emelianov215.38%133.33%
hideaki yoshifujihideaki yoshifuji215.38%133.33%
Total13100.00%3100.00%

#endif /* CONFIG_PROC_FS */ struct proto tcp_prot = { .name = "TCP", .owner = THIS_MODULE, .close = tcp_close, .connect = tcp_v4_connect, .disconnect = tcp_disconnect, .accept = inet_csk_accept, .ioctl = tcp_ioctl, .init = tcp_v4_init_sock, .destroy = tcp_v4_destroy_sock, .shutdown = tcp_shutdown, .setsockopt = tcp_setsockopt, .getsockopt = tcp_getsockopt, .recvmsg = tcp_recvmsg, .sendmsg = tcp_sendmsg, .sendpage = tcp_sendpage, .backlog_rcv = tcp_v4_do_rcv, .release_cb = tcp_release_cb, .hash = inet_hash, .unhash = inet_unhash, .get_port = inet_csk_get_port, .enter_memory_pressure = tcp_enter_memory_pressure, .stream_memory_free = tcp_stream_memory_free, .sockets_allocated = &tcp_sockets_allocated, .orphan_count = &tcp_orphan_count, .memory_allocated = &tcp_memory_allocated, .memory_pressure = &tcp_memory_pressure, .sysctl_mem = sysctl_tcp_mem, .sysctl_wmem = sysctl_tcp_wmem, .sysctl_rmem = sysctl_tcp_rmem, .max_header = MAX_TCP_HEADER, .obj_size = sizeof(struct tcp_sock), .slab_flags = SLAB_DESTROY_BY_RCU, .twsk_prot = &tcp_timewait_sock_ops, .rsk_prot = &tcp_request_sock_ops, .h.hashinfo = &tcp_hashinfo, .no_autobind = true, #ifdef CONFIG_COMPAT .compat_setsockopt = compat_tcp_setsockopt, .compat_getsockopt = compat_tcp_getsockopt, #endif .diag_destroy = tcp_abort, }; EXPORT_SYMBOL(tcp_prot);
static void __net_exit tcp_sk_exit(struct net *net) { int cpu; for_each_possible_cpu(cpu) inet_ctl_sock_destroy(*per_cpu_ptr(net->ipv4.tcp_sk, cpu)); free_percpu(net->ipv4.tcp_sk); }

Contributors

PersonTokensPropCommitsCommitProp
eric dumazeteric dumazet43100.00%1100.00%
Total43100.00%1100.00%


static int __net_init tcp_sk_init(struct net *net) { int res, cpu; net->ipv4.tcp_sk = alloc_percpu(struct sock *); if (!net->ipv4.tcp_sk) return -ENOMEM; for_each_possible_cpu(cpu) { struct sock *sk; res = inet_ctl_sock_create(&sk, PF_INET, SOCK_RAW, IPPROTO_TCP, net); if (res) goto fail; sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); *per_cpu_ptr(net->ipv4.tcp_sk, cpu) = sk; } net->ipv4.sysctl_tcp_ecn = 2; net->ipv4.sysctl_tcp_ecn_fallback = 1; net->ipv4.sysctl_tcp_base_mss = TCP_BASE_MSS; net->ipv4.sysctl_tcp_probe_threshold = TCP_PROBE_THRESHOLD; net->ipv4.sysctl_tcp_probe_interval = TCP_PROBE_INTERVAL; net->ipv4.sysctl_tcp_keepalive_time = TCP_KEEPALIVE_TIME; net->ipv4.sysctl_tcp_keepalive_probes = TCP_KEEPALIVE_PROBES; net->ipv4.sysctl_tcp_keepalive_intvl = TCP_KEEPALIVE_INTVL; net->ipv4.sysctl_tcp_syn_retries = TCP_SYN_RETRIES; net->ipv4.sysctl_tcp_synack_retries = TCP_SYNACK_RETRIES; net->ipv4.sysctl_tcp_syncookies = 1; net->ipv4.sysctl_tcp_reordering = TCP_FASTRETRANS_THRESH; net->ipv4.sysctl_tcp_retries1 = TCP_RETR1; net->ipv4.sysctl_tcp_retries2 = TCP_RETR2; net->ipv4.sysctl_tcp_orphan_retries = 0; net->ipv4.sysctl_tcp_fin_timeout = TCP_FIN_TIMEOUT; net->ipv4.sysctl_tcp_notsent_lowat = UINT_MAX; return 0; fail: tcp_sk_exit(net); return res; }

Contributors

PersonTokensPropCommitsCommitProp
eric dumazeteric dumazet9638.87%312.50%
nikolay borisovnikolay borisov9538.46%1250.00%
fan dufan du249.72%312.50%
denis v. lunevdenis v. lunev124.86%14.17%
hannes frederic sowahannes frederic sowa83.24%14.17%
daniel borkmanndaniel borkmann83.24%14.17%
pre-gitpre-git31.21%28.33%
david s. millerdavid s. miller10.40%14.17%
Total247100.00%24100.00%


static void __net_exit tcp_sk_exit_batch(struct list_head *net_exit_list) { inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET); }

Contributors

PersonTokensPropCommitsCommitProp
eric w. biedermaneric w. biederman1147.83%133.33%
daniel lezcanodaniel lezcano1147.83%133.33%
denis v. lunevdenis v. lunev14.35%133.33%
Total23100.00%3100.00%

static struct pernet_operations __net_initdata tcp_sk_ops = { .init = tcp_sk_init, .exit = tcp_sk_exit, .exit_batch = tcp_sk_exit_batch, };
void __init tcp_v4_init(void) { inet_hashinfo_init(&tcp_hashinfo); if (register_pernet_subsys(&tcp_sk_ops)) panic("Failed to create the TCP control socket.\n"); }

Contributors

PersonTokensPropCommitsCommitProp
denis v. lunevdenis v. lunev1244.44%233.33%
pre-gitpre-git725.93%116.67%
eric dumazeteric dumazet622.22%116.67%
linus torvaldslinus torvalds13.70%116.67%
eric w. biedermaneric w. biederman13.70%116.67%
Total27100.00%6100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
eric dumazeteric dumazet237520.84%12026.37%
pre-gitpre-git224819.72%459.89%
arnaldo carvalho de meloarnaldo carvalho de melo177115.54%4910.77%
hideaki yoshifujihideaki yoshifuji146012.81%153.30%
david s. millerdavid s. miller5955.22%378.13%
tom herberttom herbert3302.89%40.88%
adam langleyadam langley2662.33%20.44%
octavian purdilaoctavian purdila2041.79%91.98%
pavel emelianovpavel emelianov1681.47%122.64%
herbert xuherbert xu1511.32%81.76%
shawn lushawn lu1491.31%20.44%
linus torvaldslinus torvalds1391.22%61.32%
damian lukowskidamian lukowski1331.17%20.44%
alexey kuznetsovalexey kuznetsov1311.15%61.32%
denis v. lunevdenis v. lunev1271.11%81.76%
nikolay borisovnikolay borisov950.83%122.64%
stephen hemmingerstephen hemminger770.68%91.98%
florian westphalflorian westphal710.62%20.44%
rusty russellrusty russell580.51%10.22%
jerry chujerry chu530.46%20.44%
daniel lezcanodaniel lezcano520.46%30.66%
yuchung chengyuchung cheng480.42%30.66%
kovacs krisztiankovacs krisztian440.39%10.22%
eric w. biedermaneric w. biederman410.36%51.10%
arjan van de venarjan van de ven400.35%10.22%
tom quetchenbachtom quetchenbach370.32%10.22%
andi kleenandi kleen350.31%10.22%
tim shepardtim shepard320.28%20.44%
fan dufan du270.24%40.88%
ilpo jarvinenilpo jarvinen230.20%40.88%
balazs scheidlerbalazs scheidler200.18%10.22%
neal cardwellneal cardwell180.16%30.66%
tetsuo handatetsuo handa170.15%10.22%
hannes frederic sowahannes frederic sowa170.15%30.66%
andrey vaginandrey vagin160.14%10.22%
craig gallekcraig gallek160.14%10.22%
daniel borkmanndaniel borkmann150.13%20.44%
patrick mchardypatrick mchardy150.13%40.88%
dmitry mishindmitry mishin150.13%10.22%
benjamin lahaisebenjamin lahaise150.13%10.22%
changli gaochangli gao150.13%10.22%
james morrisjames morris140.12%20.44%
yi zhuyi zhu140.12%20.44%
dmitry popovdmitry popov120.11%10.22%
joe perchesjoe perches120.11%30.66%
nandita dukkipatinandita dukkipati120.11%10.22%
wei dongwei dong120.11%10.22%
nivedita singhvinivedita singhvi110.10%10.22%
jiri bencjiri benc110.10%10.22%
marcelo ricardo leitnermarcelo ricardo leitner80.07%10.22%
david aherndavid ahern80.07%10.22%
al viroal viro80.07%51.10%
johannes weinerjohannes weiner80.07%20.44%
william allen simpsonwilliam allen simpson70.06%20.44%
glauber costaglauber costa70.06%20.44%
vijay subramanianvijay subramanian70.06%20.44%
john dykstrajohn dykstra60.05%20.44%
andrew mortonandrew morton60.05%10.22%
hirofumi ogawahirofumi ogawa60.05%10.22%
gui jianfenggui jianfeng50.04%10.22%
anders gustafssonanders gustafsson50.04%10.22%
lorenzo colittilorenzo colitti50.04%10.22%
gao fenggao feng50.04%10.22%
gerrit renkergerrit renker40.04%10.22%
sathya perlasathya perla40.04%10.22%
eliezer tamireliezer tamir30.03%20.44%
paul moorepaul moore30.03%10.22%
ian morrisian morris30.03%10.22%
harvey harrisonharvey harrison30.03%10.22%
zheng yanzheng yan30.03%10.22%
michal kubecekmichal kubecek30.03%10.22%
brian haleybrian haley30.03%20.44%
adrian bunkadrian bunk30.03%20.44%
tejun heotejun heo30.03%10.22%
chris leechchris leech20.02%10.22%
aydin arikaydin arik20.02%10.22%
alexey dobriyanalexey dobriyan20.02%10.22%
martin kafai laumartin kafai lau20.02%10.22%
christoph paaschchristoph paasch20.02%10.22%
ingo molnaringo molnar10.01%10.22%
thomas grafthomas graf10.01%10.22%
steven colesteven cole10.01%10.22%
kris katterjohnkris katterjohn10.01%10.22%
craig schlentercraig schlenter10.01%10.22%
matthias dellwegmatthias dellweg10.01%10.22%
Total11399100.00%455100.00%
Directory: net/ipv4
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