/* * net/dccp/timer.c * * An implementation of the DCCP protocol * Arnaldo Carvalho de Melo * * 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. */ #include #include #include #include "dccp.h" /* sysctl variables governing numbers of retransmission attempts */ int sysctl_dccp_request_retries __read_mostly = TCP_SYN_RETRIES; int sysctl_dccp_retries1 __read_mostly = TCP_RETR1; int sysctl_dccp_retries2 __read_mostly = TCP_RETR2; static void dccp_write_err(struct sock *sk) { sk->sk_err = sk->sk_err_soft ? : ETIMEDOUT; sk->sk_error_report(sk); dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED); dccp_done(sk); __DCCP_INC_STATS(DCCP_MIB_ABORTONTIMEOUT); } /* A write timeout has occurred. Process the after effects. */ static int dccp_write_timeout(struct sock *sk) { const struct inet_connection_sock *icsk = inet_csk(sk); int retry_until; if (sk->sk_state == DCCP_REQUESTING || sk->sk_state == DCCP_PARTOPEN) { if (icsk->icsk_retransmits != 0) dst_negative_advice(sk); retry_until = icsk->icsk_syn_retries ? : sysctl_dccp_request_retries; } else { if (icsk->icsk_retransmits >= sysctl_dccp_retries1) { /* NOTE. draft-ietf-tcpimpl-pmtud-01.txt requires pmtu black hole detection. :-( It is place to make it. It is not made. I do not want to make it. It is disguisting. It does not work in any case. Let me to cite the same draft, which requires for us to implement this: "The one security concern raised by this memo is that ICMP black holes are often caused by over-zealous security administrators who block all ICMP messages. It is vitally important that those who design and deploy security systems understand the impact of strict filtering on upper-layer protocols. The safest web site in the world is worthless if most TCP implementations cannot transfer data from it. It would be far nicer to have all of the black holes fixed rather than fixing all of the TCP implementations." Golden words :-). */ dst_negative_advice(sk); } retry_until = sysctl_dccp_retries2; /* * FIXME: see tcp_write_timout and tcp_out_of_resources */ } if (icsk->icsk_retransmits >= retry_until) { /* Has it gone just too far? */ dccp_write_err(sk); return 1; } return 0; } /* * The DCCP retransmit timer. */ static void dccp_retransmit_timer(struct sock *sk) { struct inet_connection_sock *icsk = inet_csk(sk); /* * More than than 4MSL (8 minutes) has passed, a RESET(aborted) was * sent, no need to retransmit, this sock is dead. */ if (dccp_write_timeout(sk)) return; /* * We want to know the number of packets retransmitted, not the * total number of retransmissions of clones of original packets. */ if (icsk->icsk_retransmits == 0) __DCCP_INC_STATS(DCCP_MIB_TIMEOUTS); if (dccp_retransmit_skb(sk) != 0) { /* * Retransmission failed because of local congestion, * do not backoff. */ if (--icsk->icsk_retransmits == 0) icsk->icsk_retransmits = 1; inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, min(icsk->icsk_rto, TCP_RESOURCE_PROBE_INTERVAL), DCCP_RTO_MAX); return; } icsk->icsk_backoff++; icsk->icsk_rto = min(icsk->icsk_rto << 1, DCCP_RTO_MAX); inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, icsk->icsk_rto, DCCP_RTO_MAX); if (icsk->icsk_retransmits > sysctl_dccp_retries1) __sk_dst_reset(sk); } static void dccp_write_timer(unsigned long data) { struct sock *sk = (struct sock *)data; struct inet_connection_sock *icsk = inet_csk(sk); int event = 0; bh_lock_sock(sk); if (sock_owned_by_user(sk)) { /* Try again later */ sk_reset_timer(sk, &icsk->icsk_retransmit_timer, jiffies + (HZ / 20)); goto out; } if (sk->sk_state == DCCP_CLOSED || !icsk->icsk_pending) goto out; if (time_after(icsk->icsk_timeout, jiffies)) { sk_reset_timer(sk, &icsk->icsk_retransmit_timer, icsk->icsk_timeout); goto out; } event = icsk->icsk_pending; icsk->icsk_pending = 0; switch (event) { case ICSK_TIME_RETRANS: dccp_retransmit_timer(sk); break; } out: bh_unlock_sock(sk); sock_put(sk); } static void dccp_keepalive_timer(unsigned long data) { struct sock *sk = (struct sock *)data; pr_err("dccp should not use a keepalive timer !\n"); sock_put(sk); } /* This is the same as tcp_delack_timer, sans prequeue & mem_reclaim stuff */ static void dccp_delack_timer(unsigned long data) { struct sock *sk = (struct sock *)data; struct inet_connection_sock *icsk = inet_csk(sk); bh_lock_sock(sk); if (sock_owned_by_user(sk)) { /* Try again later. */ icsk->icsk_ack.blocked = 1; __NET_INC_STATS(sock_net(sk), LINUX_MIB_DELAYEDACKLOCKED); sk_reset_timer(sk, &icsk->icsk_delack_timer, jiffies + TCP_DELACK_MIN); goto out; } if (sk->sk_state == DCCP_CLOSED || !(icsk->icsk_ack.pending & ICSK_ACK_TIMER)) goto out; if (time_after(icsk->icsk_ack.timeout, jiffies)) { sk_reset_timer(sk, &icsk->icsk_delack_timer, icsk->icsk_ack.timeout); goto out; } icsk->icsk_ack.pending &= ~ICSK_ACK_TIMER; if (inet_csk_ack_scheduled(sk)) { if (!icsk->icsk_ack.pingpong) { /* Delayed ACK missed: inflate ATO. */ icsk->icsk_ack.ato = min(icsk->icsk_ack.ato << 1, icsk->icsk_rto); } else { /* Delayed ACK missed: leave pingpong mode and * deflate ATO. */ icsk->icsk_ack.pingpong = 0; icsk->icsk_ack.ato = TCP_ATO_MIN; } dccp_send_ack(sk); __NET_INC_STATS(sock_net(sk), LINUX_MIB_DELAYEDACKS); } out: bh_unlock_sock(sk); sock_put(sk); } /** * dccp_write_xmitlet - Workhorse for CCID packet dequeueing interface * See the comments above %ccid_dequeueing_decision for supported modes. */ static void dccp_write_xmitlet(unsigned long data) { struct sock *sk = (struct sock *)data; bh_lock_sock(sk); if (sock_owned_by_user(sk)) sk_reset_timer(sk, &dccp_sk(sk)->dccps_xmit_timer, jiffies + 1); else dccp_write_xmit(sk); bh_unlock_sock(sk); } static void dccp_write_xmit_timer(unsigned long data) { dccp_write_xmitlet(data); sock_put((struct sock *)data); } void dccp_init_xmit_timers(struct sock *sk) { struct dccp_sock *dp = dccp_sk(sk); tasklet_init(&dp->dccps_xmitlet, dccp_write_xmitlet, (unsigned long)sk); setup_timer(&dp->dccps_xmit_timer, dccp_write_xmit_timer, (unsigned long)sk); inet_csk_init_xmit_timers(sk, &dccp_write_timer, &dccp_delack_timer, &dccp_keepalive_timer); } static ktime_t dccp_timestamp_seed; /** * dccp_timestamp - 10s of microseconds time source * Returns the number of 10s of microseconds since loading DCCP. This is native * DCCP time difference format (RFC 4340, sec. 13). * Please note: This will wrap around about circa every 11.9 hours. */ u32 dccp_timestamp(void) { u64 delta = (u64)ktime_us_delta(ktime_get_real(), dccp_timestamp_seed); do_div(delta, 10); return delta; } EXPORT_SYMBOL_GPL(dccp_timestamp); void __init dccp_timestamping_init(void) { dccp_timestamp_seed = ktime_get_real(); } ) failure check in ipv6 segment routing code, from Eric Dumazet. 10) Don't execute unix_bind() under the bindlock, otherwise we deadlock with splice. From WANG Cong. 11) ip6_tnl_parse_tlv_enc_lim() potentially reallocates the skb buffer, therefore callers must reload cached header pointers into that skb. Fix from Eric Dumazet. 12) Fix various bugs in legacy IRQ fallback handling in alx driver, from Tobias Regnery. 13) Do not allow lwtunnel drivers to be unloaded while they are referenced by active instances, from Robert Shearman. 14) Fix truncated PHY LED trigger names, from Geert Uytterhoeven. 15) Fix a few regressions from virtio_net XDP support, from John Fastabend and Jakub Kicinski. * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (102 commits) ISDN: eicon: silence misleading array-bounds warning net: phy: micrel: add support for KSZ8795 gtp: fix cross netns recv on gtp socket gtp: clear DF bit on GTP packet tx gtp: add genl family modules alias tcp: don't annotate mark on control socket from tcp_v6_send_response() ravb: unmap descriptors when freeing rings virtio_net: reject XDP programs using header adjustment virtio_net: use dev_kfree_skb for small buffer XDP receive r8152: check rx after napi is enabled r8152: re-schedule napi for tx r8152: avoid start_xmit to schedule napi when napi is disabled r8152: avoid start_xmit to call napi_schedule during autosuspend net: dsa: Bring back device detaching in dsa_slave_suspend() net: phy: leds: Fix truncated LED trigger names net: phy: leds: Break dependency of phy.h on phy_led_triggers.h net: phy: leds: Clear phy_num_led_triggers on failure to avoid crash net-next: ethernet: mediatek: change the compatible string Documentation: devicetree: change the mediatek ethernet compatible string bnxt_en: Fix RTNL lock usage on bnxt_get_port_module_status(). ...
Diffstat (limited to 'include/net/caif/cfserl.h')