diff options
Diffstat (limited to 'target/linux/patches/3.15-rc8/tcp-fastopen.patch')
| -rw-r--r-- | target/linux/patches/3.15-rc8/tcp-fastopen.patch | 2082 |
1 files changed, 2082 insertions, 0 deletions
diff --git a/target/linux/patches/3.15-rc8/tcp-fastopen.patch b/target/linux/patches/3.15-rc8/tcp-fastopen.patch new file mode 100644 index 000000000..fc1d076ac --- /dev/null +++ b/target/linux/patches/3.15-rc8/tcp-fastopen.patch @@ -0,0 +1,2082 @@ +diff -Nur linux-3.15-rc7.orig/include/linux/tcp.h linux-3.15-rc7/include/linux/tcp.h +--- linux-3.15-rc7.orig/include/linux/tcp.h 2014-05-26 01:06:00.000000000 +0200 ++++ linux-3.15-rc7/include/linux/tcp.h 2014-05-31 22:42:49.024605293 +0200 +@@ -359,6 +359,9 @@ + return (struct tcp_timewait_sock *)sk; + } + ++extern void tcp_sock_destruct(struct sock *sk); ++ ++#ifdef CONFIG_TCP_FASTOPEN + static inline bool tcp_passive_fastopen(const struct sock *sk) + { + return (sk->sk_state == TCP_SYN_RECV && +@@ -370,8 +373,6 @@ + return foc->len != -1; + } + +-extern void tcp_sock_destruct(struct sock *sk); +- + static inline int fastopen_init_queue(struct sock *sk, int backlog) + { + struct request_sock_queue *queue = +@@ -391,4 +392,13 @@ + return 0; + } + ++#else ++static inline bool tcp_passive_fastopen(const struct sock *sk) ++{ return false; } ++static inline bool fastopen_cookie_present(struct tcp_fastopen_cookie *foc) ++{ return false; } ++static inline int fastopen_init_queue(struct sock *sk, int backlog) ++{ return 0; } ++#endif ++ + #endif /* _LINUX_TCP_H */ +diff -Nur linux-3.15-rc7.orig/include/net/request_sock.h linux-3.15-rc7/include/net/request_sock.h +--- linux-3.15-rc7.orig/include/net/request_sock.h 2014-05-26 01:06:00.000000000 +0200 ++++ linux-3.15-rc7/include/net/request_sock.h 2014-05-31 22:42:49.024605293 +0200 +@@ -168,8 +168,13 @@ + + void __reqsk_queue_destroy(struct request_sock_queue *queue); + void reqsk_queue_destroy(struct request_sock_queue *queue); ++#ifdef CONFIG_TCP_FASTOPEN + void reqsk_fastopen_remove(struct sock *sk, struct request_sock *req, + bool reset); ++#else ++static inline void reqsk_fastopen_remove(struct sock *sk, struct request_sock *req, ++ bool reset) {} ++#endif + + static inline struct request_sock * + reqsk_queue_yank_acceptq(struct request_sock_queue *queue) +diff -Nur linux-3.15-rc7.orig/include/net/tcp.h linux-3.15-rc7/include/net/tcp.h +--- linux-3.15-rc7.orig/include/net/tcp.h 2014-05-26 01:06:00.000000000 +0200 ++++ linux-3.15-rc7/include/net/tcp.h 2014-05-31 22:42:49.028605326 +0200 +@@ -251,7 +251,11 @@ + extern int sysctl_tcp_retries2; + extern int sysctl_tcp_orphan_retries; + extern int sysctl_tcp_syncookies; ++#ifdef CONFIG_TCP_FASTOPEN + extern int sysctl_tcp_fastopen; ++#else ++#define sysctl_tcp_fastopen 0 ++#endif + extern int sysctl_tcp_retrans_collapse; + extern int sysctl_tcp_stdurg; + extern int sysctl_tcp_rfc1337; +@@ -1308,7 +1312,12 @@ + size_t size; + int copied; /* queued in tcp_connect() */ + }; ++ ++#ifdef CONFIG_TCP_FASTOPEN + void tcp_free_fastopen_req(struct tcp_sock *tp); ++#else ++static inline void tcp_free_fastopen_req(struct tcp_sock *tp) {} ++#endif + + extern struct tcp_fastopen_context __rcu *tcp_fastopen_ctx; + int tcp_fastopen_reset_cipher(void *key, unsigned int len); +diff -Nur linux-3.15-rc7.orig/include/net/tcp.h.orig linux-3.15-rc7/include/net/tcp.h.orig +--- linux-3.15-rc7.orig/include/net/tcp.h.orig 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc7/include/net/tcp.h.orig 2014-05-26 01:06:00.000000000 +0200 +@@ -0,0 +1,1600 @@ ++/* ++ * 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. ++ * ++ * Definitions for the TCP module. ++ * ++ * Version: @(#)tcp.h 1.0.5 05/23/93 ++ * ++ * Authors: Ross Biro ++ * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> ++ * ++ * 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. ++ */ ++#ifndef _TCP_H ++#define _TCP_H ++ ++#define FASTRETRANS_DEBUG 1 ++ ++#include <linux/list.h> ++#include <linux/tcp.h> ++#include <linux/bug.h> ++#include <linux/slab.h> ++#include <linux/cache.h> ++#include <linux/percpu.h> ++#include <linux/skbuff.h> ++#include <linux/dmaengine.h> ++#include <linux/crypto.h> ++#include <linux/cryptohash.h> ++#include <linux/kref.h> ++#include <linux/ktime.h> ++ ++#include <net/inet_connection_sock.h> ++#include <net/inet_timewait_sock.h> ++#include <net/inet_hashtables.h> ++#include <net/checksum.h> ++#include <net/request_sock.h> ++#include <net/sock.h> ++#include <net/snmp.h> ++#include <net/ip.h> ++#include <net/tcp_states.h> ++#include <net/inet_ecn.h> ++#include <net/dst.h> ++ ++#include <linux/seq_file.h> ++#include <linux/memcontrol.h> ++ ++extern struct inet_hashinfo tcp_hashinfo; ++ ++extern struct percpu_counter tcp_orphan_count; ++void tcp_time_wait(struct sock *sk, int state, int timeo); ++ ++#define MAX_TCP_HEADER (128 + MAX_HEADER) ++#define MAX_TCP_OPTION_SPACE 40 ++ ++/* ++ * Never offer a window over 32767 without using window scaling. Some ++ * poor stacks do signed 16bit maths! ++ */ ++#define MAX_TCP_WINDOW 32767U ++ ++/* Minimal accepted MSS. It is (60+60+8) - (20+20). */ ++#define TCP_MIN_MSS 88U ++ ++/* The least MTU to use for probing */ ++#define TCP_BASE_MSS 512 ++ ++/* After receiving this amount of duplicate ACKs fast retransmit starts. */ ++#define TCP_FASTRETRANS_THRESH 3 ++ ++/* Maximal reordering. */ ++#define TCP_MAX_REORDERING 127 ++ ++/* Maximal number of ACKs sent quickly to accelerate slow-start. */ ++#define TCP_MAX_QUICKACKS 16U ++ ++/* urg_data states */ ++#define TCP_URG_VALID 0x0100 ++#define TCP_URG_NOTYET 0x0200 ++#define TCP_URG_READ 0x0400 ++ ++#define TCP_RETR1 3 /* ++ * This is how many retries it does before it ++ * tries to figure out if the gateway is ++ * down. Minimal RFC value is 3; it corresponds ++ * to ~3sec-8min depending on RTO. ++ */ ++ ++#define TCP_RETR2 15 /* ++ * This should take at least ++ * 90 minutes to time out. ++ * RFC1122 says that the limit is 100 sec. ++ * 15 is ~13-30min depending on RTO. ++ */ ++ ++#define TCP_SYN_RETRIES 6 /* This is how many retries are done ++ * when active opening a connection. ++ * RFC1122 says the minimum retry MUST ++ * be at least 180secs. Nevertheless ++ * this value is corresponding to ++ * 63secs of retransmission with the ++ * current initial RTO. ++ */ ++ ++#define TCP_SYNACK_RETRIES 5 /* This is how may retries are done ++ * when passive opening a connection. ++ * This is corresponding to 31secs of ++ * retransmission with the current ++ * initial RTO. ++ */ ++ ++#define TCP_TIMEWAIT_LEN (60*HZ) /* how long to wait to destroy TIME-WAIT ++ * state, about 60 seconds */ ++#define TCP_FIN_TIMEOUT TCP_TIMEWAIT_LEN ++ /* BSD style FIN_WAIT2 deadlock breaker. ++ * It used to be 3min, new value is 60sec, ++ * to combine FIN-WAIT-2 timeout with ++ * TIME-WAIT timer. ++ */ ++ ++#define TCP_DELACK_MAX ((unsigned)(HZ/5)) /* maximal time to delay before sending an ACK */ ++#if HZ >= 100 ++#define TCP_DELACK_MIN ((unsigned)(HZ/25)) /* minimal time to delay before sending an ACK */ ++#define TCP_ATO_MIN ((unsigned)(HZ/25)) ++#else ++#define TCP_DELACK_MIN 4U ++#define TCP_ATO_MIN 4U ++#endif ++#define TCP_RTO_MAX ((unsigned)(120*HZ)) ++#define TCP_RTO_MIN ((unsigned)(HZ/5)) ++#define TCP_TIMEOUT_INIT ((unsigned)(1*HZ)) /* RFC6298 2.1 initial RTO value */ ++#define TCP_TIMEOUT_FALLBACK ((unsigned)(3*HZ)) /* RFC 1122 initial RTO value, now ++ * used as a fallback RTO for the ++ * initial data transmission if no ++ * valid RTT sample has been acquired, ++ * most likely due to retrans in 3WHS. ++ */ ++ ++#define TCP_RESOURCE_PROBE_INTERVAL ((unsigned)(HZ/2U)) /* Maximal interval between probes ++ * for local resources. ++ */ ++ ++#define TCP_KEEPALIVE_TIME (120*60*HZ) /* two hours */ ++#define TCP_KEEPALIVE_PROBES 9 /* Max of 9 keepalive probes */ ++#define TCP_KEEPALIVE_INTVL (75*HZ) ++ ++#define MAX_TCP_KEEPIDLE 32767 ++#define MAX_TCP_KEEPINTVL 32767 ++#define MAX_TCP_KEEPCNT 127 ++#define MAX_TCP_SYNCNT 127 ++ ++#define TCP_SYNQ_INTERVAL (HZ/5) /* Period of SYNACK timer */ ++ ++#define TCP_PAWS_24DAYS (60 * 60 * 24 * 24) ++#define TCP_PAWS_MSL 60 /* Per-host timestamps are invalidated ++ * after this time. It should be equal ++ * (or greater than) TCP_TIMEWAIT_LEN ++ * to provide reliability equal to one ++ * provided by timewait state. ++ */ ++#define TCP_PAWS_WINDOW 1 /* Replay window for per-host ++ * timestamps. It must be less than ++ * minimal timewait lifetime. ++ */ ++/* ++ * TCP option ++ */ ++ ++#define TCPOPT_NOP 1 /* Padding */ ++#define TCPOPT_EOL 0 /* End of options */ ++#define TCPOPT_MSS 2 /* Segment size negotiating */ ++#define TCPOPT_WINDOW 3 /* Window scaling */ ++#define TCPOPT_SACK_PERM 4 /* SACK Permitted */ ++#define TCPOPT_SACK 5 /* SACK Block */ ++#define TCPOPT_TIMESTAMP 8 /* Better RTT estimations/PAWS */ ++#define TCPOPT_MD5SIG 19 /* MD5 Signature (RFC2385) */ ++#define TCPOPT_EXP 254 /* Experimental */ ++/* Magic number to be after the option value for sharing TCP ++ * experimental options. See draft-ietf-tcpm-experimental-options-00.txt ++ */ ++#define TCPOPT_FASTOPEN_MAGIC 0xF989 ++ ++/* ++ * TCP option lengths ++ */ ++ ++#define TCPOLEN_MSS 4 ++#define TCPOLEN_WINDOW 3 ++#define TCPOLEN_SACK_PERM 2 ++#define TCPOLEN_TIMESTAMP 10 ++#define TCPOLEN_MD5SIG 18 ++#define TCPOLEN_EXP_FASTOPEN_BASE 4 ++ ++/* But this is what stacks really send out. */ ++#define TCPOLEN_TSTAMP_ALIGNED 12 ++#define TCPOLEN_WSCALE_ALIGNED 4 ++#define TCPOLEN_SACKPERM_ALIGNED 4 ++#define TCPOLEN_SACK_BASE 2 ++#define TCPOLEN_SACK_BASE_ALIGNED 4 ++#define TCPOLEN_SACK_PERBLOCK 8 ++#define TCPOLEN_MD5SIG_ALIGNED 20 ++#define TCPOLEN_MSS_ALIGNED 4 ++ ++/* Flags in tp->nonagle */ ++#define TCP_NAGLE_OFF 1 /* Nagle's algo is disabled */ ++#define TCP_NAGLE_CORK 2 /* Socket is corked */ ++#define TCP_NAGLE_PUSH 4 /* Cork is overridden for already queued data */ ++ ++/* TCP thin-stream limits */ ++#define TCP_THIN_LINEAR_RETRIES 6 /* After 6 linear retries, do exp. backoff */ ++ ++/* TCP initial congestion window as per draft-hkchu-tcpm-initcwnd-01 */ ++#define TCP_INIT_CWND 10 ++ ++/* Bit Flags for sysctl_tcp_fastopen */ ++#define TFO_CLIENT_ENABLE 1 ++#define TFO_SERVER_ENABLE 2 ++#define TFO_CLIENT_NO_COOKIE 4 /* Data in SYN w/o cookie option */ ++ ++/* Process SYN data but skip cookie validation */ ++#define TFO_SERVER_COOKIE_NOT_CHKED 0x100 ++/* Accept SYN data w/o any cookie option */ ++#define TFO_SERVER_COOKIE_NOT_REQD 0x200 ++ ++/* Force enable TFO on all listeners, i.e., not requiring the ++ * TCP_FASTOPEN socket option. SOCKOPT1/2 determine how to set max_qlen. ++ */ ++#define TFO_SERVER_WO_SOCKOPT1 0x400 ++#define TFO_SERVER_WO_SOCKOPT2 0x800 ++/* Always create TFO child sockets on a TFO listener even when ++ * cookie/data not present. (For testing purpose!) ++ */ ++#define TFO_SERVER_ALWAYS 0x1000 ++ ++extern struct inet_timewait_death_row tcp_death_row; ++ ++/* sysctl variables for tcp */ ++extern int sysctl_tcp_timestamps; ++extern int sysctl_tcp_window_scaling; ++extern int sysctl_tcp_sack; ++extern int sysctl_tcp_fin_timeout; ++extern int sysctl_tcp_keepalive_time; ++extern int sysctl_tcp_keepalive_probes; ++extern int sysctl_tcp_keepalive_intvl; ++extern int sysctl_tcp_syn_retries; ++extern int sysctl_tcp_synack_retries; ++extern int sysctl_tcp_retries1; ++extern int sysctl_tcp_retries2; ++extern int sysctl_tcp_orphan_retries; ++extern int sysctl_tcp_syncookies; ++extern int sysctl_tcp_fastopen; ++extern int sysctl_tcp_retrans_collapse; ++extern int sysctl_tcp_stdurg; ++extern int sysctl_tcp_rfc1337; ++extern int sysctl_tcp_abort_on_overflow; ++extern int sysctl_tcp_max_orphans; ++extern int sysctl_tcp_fack; ++extern int sysctl_tcp_reordering; ++extern int sysctl_tcp_dsack; ++extern long sysctl_tcp_mem[3]; ++extern int sysctl_tcp_wmem[3]; ++extern int sysctl_tcp_rmem[3]; ++extern int sysctl_tcp_app_win; ++extern int sysctl_tcp_adv_win_scale; ++extern int sysctl_tcp_tw_reuse; ++extern int sysctl_tcp_frto; ++extern int sysctl_tcp_low_latency; ++extern int sysctl_tcp_dma_copybreak; ++extern int sysctl_tcp_nometrics_save; ++extern int sysctl_tcp_moderate_rcvbuf; ++extern int sysctl_tcp_tso_win_divisor; ++extern int sysctl_tcp_mtu_probing; ++extern int sysctl_tcp_base_mss; ++extern int sysctl_tcp_workaround_signed_windows; ++extern int sysctl_tcp_slow_start_after_idle; ++extern int sysctl_tcp_thin_linear_timeouts; ++extern int sysctl_tcp_thin_dupack; ++extern int sysctl_tcp_early_retrans; ++extern int sysctl_tcp_limit_output_bytes; ++extern int sysctl_tcp_challenge_ack_limit; ++extern unsigned int sysctl_tcp_notsent_lowat; ++extern int sysctl_tcp_min_tso_segs; ++extern int sysctl_tcp_autocorking; ++ ++extern atomic_long_t tcp_memory_allocated; ++extern struct percpu_counter tcp_sockets_allocated; ++extern int tcp_memory_pressure; ++ ++/* ++ * The next routines deal with comparing 32 bit unsigned ints ++ * and worry about wraparound (automatic with unsigned arithmetic). ++ */ ++ ++static inline bool before(__u32 seq1, __u32 seq2) ++{ ++ return (__s32)(seq1-seq2) < 0; ++} ++#define after(seq2, seq1) before(seq1, seq2) ++ ++/* is s2<=s1<=s3 ? */ ++static inline bool between(__u32 seq1, __u32 seq2, __u32 seq3) ++{ ++ return seq3 - seq2 >= seq1 - seq2; ++} ++ ++static inline bool tcp_out_of_memory(struct sock *sk) ++{ ++ if (sk->sk_wmem_queued > SOCK_MIN_SNDBUF && ++ sk_memory_allocated(sk) > sk_prot_mem_limits(sk, 2)) ++ return true; ++ return false; ++} ++ ++static inline bool tcp_too_many_orphans(struct sock *sk, int shift) ++{ ++ struct percpu_counter *ocp = sk->sk_prot->orphan_count; ++ int orphans = percpu_counter_read_positive(ocp); ++ ++ if (orphans << shift > sysctl_tcp_max_orphans) { ++ orphans = percpu_counter_sum_positive(ocp); ++ if (orphans << shift > sysctl_tcp_max_orphans) ++ return true; ++ } ++ return false; ++} ++ ++bool tcp_check_oom(struct sock *sk, int shift); ++ ++/* syncookies: remember time of last synqueue overflow */ ++static inline void tcp_synq_overflow(struct sock *sk) ++{ ++ tcp_sk(sk)->rx_opt.ts_recent_stamp = jiffies; ++} ++ ++/* syncookies: no recent synqueue overflow on this listening socket? */ ++static inline bool tcp_synq_no_recent_overflow(const struct sock *sk) ++{ ++ unsigned long last_overflow = tcp_sk(sk)->rx_opt.ts_recent_stamp; ++ return time_after(jiffies, last_overflow + TCP_TIMEOUT_FALLBACK); ++} ++ ++extern struct proto tcp_prot; ++ ++#define TCP_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.tcp_statistics, field) ++#define TCP_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.tcp_statistics, field) ++#define TCP_DEC_STATS(net, field) SNMP_DEC_STATS((net)->mib.tcp_statistics, field) ++#define TCP_ADD_STATS_USER(net, field, val) SNMP_ADD_STATS_USER((net)->mib.tcp_statistics, field, val) ++#define TCP_ADD_STATS(net, field, val) SNMP_ADD_STATS((net)->mib.tcp_statistics, field, val) ++ ++void tcp_tasklet_init(void); ++ ++void tcp_v4_err(struct sk_buff *skb, u32); ++ ++void tcp_shutdown(struct sock *sk, int how); ++ ++void tcp_v4_early_demux(struct sk_buff *skb); ++int tcp_v4_rcv(struct sk_buff *skb); ++ ++int tcp_v4_tw_remember_stamp(struct inet_timewait_sock *tw); ++int tcp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, ++ size_t size); ++int tcp_sendpage(struct sock *sk, struct page *page, int offset, size_t size, ++ int flags); ++void tcp_release_cb(struct sock *sk); ++void tcp_wfree(struct sk_buff *skb); ++void tcp_write_timer_handler(struct sock *sk); ++void tcp_delack_timer_handler(struct sock *sk); ++int tcp_ioctl(struct sock *sk, int cmd, unsigned long arg); ++int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb, ++ const struct tcphdr *th, unsigned int len); ++void tcp_rcv_established(struct sock *sk, struct sk_buff *skb, ++ const struct tcphdr *th, unsigned int len); ++void tcp_rcv_space_adjust(struct sock *sk); ++void tcp_cleanup_rbuf(struct sock *sk, int copied); ++int tcp_twsk_unique(struct sock *sk, struct sock *sktw, void *twp); ++void tcp_twsk_destructor(struct sock *sk); ++ssize_t tcp_splice_read(struct socket *sk, loff_t *ppos, ++ struct pipe_inode_info *pipe, size_t len, ++ unsigned int flags); ++ ++static inline void tcp_dec_quickack_mode(struct sock *sk, ++ const unsigned int pkts) ++{ ++ struct inet_connection_sock *icsk = inet_csk(sk); ++ ++ if (icsk->icsk_ack.quick) { ++ if (pkts >= icsk->icsk_ack.quick) { ++ icsk->icsk_ack.quick = 0; ++ /* Leaving quickack mode we deflate ATO. */ ++ icsk->icsk_ack.ato = TCP_ATO_MIN; ++ } else ++ icsk->icsk_ack.quick -= pkts; ++ } ++} ++ ++#define TCP_ECN_OK 1 ++#define TCP_ECN_QUEUE_CWR 2 ++#define TCP_ECN_DEMAND_CWR 4 ++#define TCP_ECN_SEEN 8 ++ ++enum tcp_tw_status { ++ TCP_TW_SUCCESS = 0, ++ TCP_TW_RST = 1, ++ TCP_TW_ACK = 2, ++ TCP_TW_SYN = 3 ++}; ++ ++ ++enum tcp_tw_status tcp_timewait_state_process(struct inet_timewait_sock *tw, ++ struct sk_buff *skb, ++ const struct tcphdr *th); ++struct sock *tcp_check_req(struct sock *sk, struct sk_buff *skb, ++ struct request_sock *req, struct request_sock **prev, ++ bool fastopen); ++int tcp_child_process(struct sock *parent, struct sock *child, ++ struct sk_buff *skb); ++void tcp_enter_loss(struct sock *sk, int how); ++void tcp_clear_retrans(struct tcp_sock *tp); ++void tcp_update_metrics(struct sock *sk); ++void tcp_init_metrics(struct sock *sk); ++void tcp_metrics_init(void); ++bool tcp_peer_is_proven(struct request_sock *req, struct dst_entry *dst, ++ bool paws_check); ++bool tcp_remember_stamp(struct sock *sk); ++bool tcp_tw_remember_stamp(struct inet_timewait_sock *tw); ++void tcp_fetch_timewait_stamp(struct sock *sk, struct dst_entry *dst); ++void tcp_disable_fack(struct tcp_sock *tp); ++void tcp_close(struct sock *sk, long timeout); ++void tcp_init_sock(struct sock *sk); ++unsigned int tcp_poll(struct file *file, struct socket *sock, ++ struct poll_table_struct *wait); ++int tcp_getsockopt(struct sock *sk, int level, int optname, ++ char __user *optval, int __user *optlen); ++int tcp_setsockopt(struct sock *sk, int level, int optname, ++ char __user *optval, unsigned int optlen); ++int compat_tcp_getsockopt(struct sock *sk, int level, int optname, ++ char __user *optval, int __user *optlen); ++int compat_tcp_setsockopt(struct sock *sk, int level, int optname, ++ char __user *optval, unsigned int optlen); ++void tcp_set_keepalive(struct sock *sk, int val); ++void tcp_syn_ack_timeout(struct sock *sk, struct request_sock *req); ++int tcp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, ++ size_t len, int nonblock, int flags, int *addr_len); ++void tcp_parse_options(const struct sk_buff *skb, ++ struct tcp_options_received *opt_rx, ++ int estab, struct tcp_fastopen_cookie *foc); ++const u8 *tcp_parse_md5sig_option(const struct tcphdr *th); ++ ++/* ++ * TCP v4 functions exported for the inet6 API ++ */ ++ ++void tcp_v4_send_check(struct sock *sk, struct sk_buff *skb); ++int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb); ++struct sock *tcp_create_openreq_child(struct sock *sk, ++ struct request_sock *req, ++ struct sk_buff *skb); ++struct sock *tcp_v4_syn_recv_sock(struct sock *sk, struct sk_buff *skb, ++ struct request_sock *req, ++ struct dst_entry *dst); ++int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb); ++int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); ++int tcp_connect(struct sock *sk); ++struct sk_buff *tcp_make_synack(struct sock *sk, struct dst_entry *dst, ++ struct request_sock *req, ++ struct tcp_fastopen_cookie *foc); ++int tcp_disconnect(struct sock *sk, int flags); ++ ++void tcp_finish_connect(struct sock *sk, struct sk_buff *skb); ++int tcp_send_rcvq(struct sock *sk, struct msghdr *msg, size_t size); ++void inet_sk_rx_dst_set(struct sock *sk, const struct sk_buff *skb); ++ ++/* From syncookies.c */ ++int __cookie_v4_check(const struct iphdr *iph, const struct tcphdr *th, ++ u32 cookie); ++struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb, ++ struct ip_options *opt); ++#ifdef CONFIG_SYN_COOKIES ++ ++/* Syncookies use a monotonic timer which increments every 60 seconds. ++ * This counter is used both as a hash input and partially encoded into ++ * the cookie value. A cookie is only validated further if the delta ++ * between the current counter value and the encoded one is less than this, ++ * i.e. a sent cookie is valid only at most for 2*60 seconds (or less if ++ * the counter advances immediately after a cookie is generated). ++ */ ++#define MAX_SYNCOOKIE_AGE 2 ++ ++static inline u32 tcp_cookie_time(void) ++{ ++ u64 val = get_jiffies_64(); ++ ++ do_div(val, 60 * HZ); ++ return val; ++} ++ ++u32 __cookie_v4_init_sequence(const struct iphdr *iph, const struct tcphdr *th, ++ u16 *mssp); ++__u32 cookie_v4_init_sequence(struct sock *sk, struct sk_buff *skb, __u16 *mss); ++#else ++static inline __u32 cookie_v4_init_sequence(struct sock *sk, ++ struct sk_buff *skb, ++ __u16 *mss) ++{ ++ return 0; ++} ++#endif ++ ++__u32 cookie_init_timestamp(struct request_sock *req); ++bool cookie_check_timestamp(struct tcp_options_received *opt, struct net *net, ++ bool *ecn_ok); ++ ++/* From net/ipv6/syncookies.c */ ++int __cookie_v6_check(const struct ipv6hdr *iph, const struct tcphdr *th, ++ u32 cookie); ++struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb); ++#ifdef CONFIG_SYN_COOKIES ++u32 __cookie_v6_init_sequence(const struct ipv6hdr *iph, ++ const struct tcphdr *th, u16 *mssp); ++__u32 cookie_v6_init_sequence(struct sock *sk, const struct sk_buff *skb, ++ __u16 *mss); ++#else ++static inline __u32 cookie_v6_init_sequence(struct sock *sk, ++ struct sk_buff *skb, ++ __u16 *mss) ++{ ++ return 0; ++} ++#endif ++/* tcp_output.c */ ++ ++void __tcp_push_pending_frames(struct sock *sk, unsigned int cur_mss, ++ int nonagle); ++bool tcp_may_send_now(struct sock *sk); ++int __tcp_retransmit_skb(struct sock *, struct sk_buff *); ++int tcp_retransmit_skb(struct sock *, struct sk_buff *); ++void tcp_retransmit_timer(struct sock *sk); ++void tcp_xmit_retransmit_queue(struct sock *); ++void tcp_simple_retransmit(struct sock *); ++int tcp_trim_head(struct sock *, struct sk_buff *, u32); ++int tcp_fragment(struct sock *, struct sk_buff *, u32, unsigned int); ++ ++void tcp_send_probe0(struct sock *); ++void tcp_send_partial(struct sock *); ++int tcp_write_wakeup(struct sock *); ++void tcp_send_fin(struct sock *sk); ++void tcp_send_active_reset(struct sock *sk, gfp_t priority); ++int tcp_send_synack(struct sock *); ++bool tcp_syn_flood_action(struct sock *sk, const struct sk_buff *skb, ++ const char *proto); ++void tcp_push_one(struct sock *, unsigned int mss_now); ++void tcp_send_ack(struct sock *sk); ++void tcp_send_delayed_ack(struct sock *sk); ++void tcp_send_loss_probe(struct sock *sk); ++bool tcp_schedule_loss_probe(struct sock *sk); ++ ++/* tcp_input.c */ ++void tcp_cwnd_application_limited(struct sock *sk); ++void tcp_resume_early_retransmit(struct sock *sk); ++void tcp_rearm_rto(struct sock *sk); ++void tcp_reset(struct sock *sk); ++ ++/* tcp_timer.c */ ++void tcp_init_xmit_timers(struct sock *); ++static inline void tcp_clear_xmit_timers(struct sock *sk) ++{ ++ inet_csk_clear_xmit_timers(sk); ++} ++ ++unsigned int tcp_sync_mss(struct sock *sk, u32 pmtu); ++unsigned int tcp_current_mss(struct sock *sk); ++ ++/* Bound MSS / TSO packet size with the half of the window */ ++static inline int tcp_bound_to_half_wnd(struct tcp_sock *tp, int pktsize) ++{ ++ int cutoff; ++ ++ /* When peer uses tiny windows, there is no use in packetizing ++ * to sub-MSS pieces for the sake of SWS or making sure there ++ * are enough packets in the pipe for fast recovery. ++ * ++ * On the other hand, for extremely large MSS devices, handling ++ * smaller than MSS windows in this way does make sense. ++ */ ++ if (tp->max_window >= 512) ++ cutoff = (tp->max_window >> 1); ++ else ++ cutoff = tp->max_window; ++ ++ if (cutoff && pktsize > cutoff) ++ return max_t(int, cutoff, 68U - tp->tcp_header_len); ++ else ++ return pktsize; ++} ++ ++/* tcp.c */ ++void tcp_get_info(const struct sock *, struct tcp_info *); ++ ++/* Read 'sendfile()'-style from a TCP socket */ ++typedef int (*sk_read_actor_t)(read_descriptor_t *, struct sk_buff *, ++ unsigned int, size_t); ++int tcp_read_sock(struct sock *sk, read_descriptor_t *desc, ++ sk_read_actor_t recv_actor); ++ ++void tcp_initialize_rcv_mss(struct sock *sk); ++ ++int tcp_mtu_to_mss(struct sock *sk, int pmtu); ++int tcp_mss_to_mtu(struct sock *sk, int mss); ++void tcp_mtup_init(struct sock *sk); ++void tcp_init_buffer_space(struct sock *sk); ++ ++static inline void tcp_bound_rto(const struct sock *sk) ++{ ++ if (inet_csk(sk)->icsk_rto > TCP_RTO_MAX) ++ inet_csk(sk)->icsk_rto = TCP_RTO_MAX; ++} ++ ++static inline u32 __tcp_set_rto(const struct tcp_sock *tp) ++{ ++ return usecs_to_jiffies((tp->srtt_us >> 3) + tp->rttvar_us); ++} ++ ++static inline void __tcp_fast_path_on(struct tcp_sock *tp, u32 snd_wnd) ++{ ++ tp->pred_flags = htonl((tp->tcp_header_len << 26) | ++ ntohl(TCP_FLAG_ACK) | ++ snd_wnd); ++} ++ ++static inline void tcp_fast_path_on(struct tcp_sock *tp) ++{ ++ __tcp_fast_path_on(tp, tp->snd_wnd >> tp->rx_opt.snd_wscale); ++} ++ ++static inline void tcp_fast_path_check(struct sock *sk) ++{ ++ struct tcp_sock *tp = tcp_sk(sk); ++ ++ if (skb_queue_empty(&tp->out_of_order_queue) && ++ tp->rcv_wnd && ++ atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf && ++ !tp->urg_data) ++ tcp_fast_path_on(tp); ++} ++ ++/* Compute the actual rto_min value */ ++static inline u32 tcp_rto_min(struct sock *sk) ++{ ++ const struct dst_entry *dst = __sk_dst_get(sk); ++ u32 rto_min = TCP_RTO_MIN; ++ ++ if (dst && dst_metric_locked(dst, RTAX_RTO_MIN)) ++ rto_min = dst_metric_rtt(dst, RTAX_RTO_MIN); ++ return rto_min; ++} ++ ++static inline u32 tcp_rto_min_us(struct sock *sk) ++{ ++ return jiffies_to_usecs(tcp_rto_min(sk)); ++} ++ ++/* Compute the actual receive window we are currently advertising. ++ * Rcv_nxt can be after the window if our peer push more data ++ * than the offered window. ++ */ ++static inline u32 tcp_receive_window(const struct tcp_sock *tp) ++{ ++ s32 win = tp->rcv_wup + tp->rcv_wnd - tp->rcv_nxt; ++ ++ if (win < 0) ++ win = 0; ++ return (u32) win; ++} ++ ++/* Choose a new window, without checks for shrinking, and without ++ * scaling applied to the result. The caller does these things ++ * if necessary. This is a "raw" window selection. ++ */ ++u32 __tcp_select_window(struct sock *sk); ++ ++void tcp_send_window_probe(struct sock *sk); ++ ++/* TCP timestamps are only 32-bits, this causes a slight ++ * complication on 64-bit systems since we store a snapshot ++ * of jiffies in the buffer control blocks below. We decided ++ * to use only the low 32-bits of jiffies and hide the ugly ++ * casts with the following macro. ++ */ ++#define tcp_time_stamp ((__u32)(jiffies)) ++ ++#define tcp_flag_byte(th) (((u_int8_t *)th)[13]) ++ ++#define TCPHDR_FIN 0x01 ++#define TCPHDR_SYN 0x02 ++#define TCPHDR_RST 0x04 ++#define TCPHDR_PSH 0x08 ++#define TCPHDR_ACK 0x10 ++#define TCPHDR_URG 0x20 ++#define TCPHDR_ECE 0x40 ++#define TCPHDR_CWR 0x80 ++ ++/* This is what the send packet queuing engine uses to pass ++ * TCP per-packet control information to the transmission code. ++ * We also store the host-order sequence numbers in here too. ++ * This is 44 bytes if IPV6 is enabled. ++ * If this grows please adjust skbuff.h:skbuff->cb[xxx] size appropriately. ++ */ ++struct tcp_skb_cb { ++ union { ++ struct inet_skb_parm h4; ++#if IS_ENABLED(CONFIG_IPV6) ++ struct inet6_skb_parm h6; ++#endif ++ } header; /* For incoming frames */ ++ __u32 seq; /* Starting sequence number */ ++ __u32 end_seq; /* SEQ + FIN + SYN + datalen */ ++ __u32 when; /* used to compute rtt's */ ++ __u8 tcp_flags; /* TCP header flags. (tcp[13]) */ ++ ++ __u8 sacked; /* State flags for SACK/FACK. */ ++#define TCPCB_SACKED_ACKED 0x01 /* SKB ACK'd by a SACK block */ ++#define TCPCB_SACKED_RETRANS 0x02 /* SKB retransmitted */ ++#define TCPCB_LOST 0x04 /* SKB is lost */ ++#define TCPCB_TAGBITS 0x07 /* All tag bits */ ++#define TCPCB_EVER_RETRANS 0x80 /* Ever retransmitted frame */ ++#define TCPCB_RETRANS (TCPCB_SACKED_RETRANS|TCPCB_EVER_RETRANS) ++ ++ __u8 ip_dsfield; /* IPv4 tos or IPv6 dsfield */ ++ /* 1 byte hole */ ++ __u32 ack_seq; /* Sequence number ACK'd */ ++}; ++ ++#define TCP_SKB_CB(__skb) ((struct tcp_skb_cb *)&((__skb)->cb[0])) ++ ++/* RFC3168 : 6.1.1 SYN packets must not have ECT/ECN bits set ++ * ++ * If we receive a SYN packet with these bits set, it means a network is ++ * playing bad games with TOS bits. In order to avoid possible false congestion ++ * notifications, we disable TCP ECN negociation. ++ */ ++static inline void ++TCP_ECN_create_request(struct request_sock *req, const struct sk_buff *skb, ++ struct net *net) ++{ ++ const struct tcphdr *th = tcp_hdr(skb); ++ ++ if (net->ipv4.sysctl_tcp_ecn && th->ece && th->cwr && ++ INET_ECN_is_not_ect(TCP_SKB_CB(skb)->ip_dsfield)) ++ inet_rsk(req)->ecn_ok = 1; ++} ++ ++/* Due to TSO, an SKB can be composed of multiple actual ++ * packets. To keep these tracked properly, we use this. ++ */ ++static inline int tcp_skb_pcount(const struct sk_buff *skb) ++{ ++ return skb_shinfo(skb)->gso_segs; ++} ++ ++/* This is valid iff tcp_skb_pcount() > 1. */ ++static inline int tcp_skb_mss(const struct sk_buff *skb) ++{ ++ return skb_shinfo(skb)->gso_size; ++} ++ ++/* Events passed to congestion control interface */ ++enum tcp_ca_event { ++ CA_EVENT_TX_START, /* first transmit when no packets in flight */ ++ CA_EVENT_CWND_RESTART, /* congestion window restart */ ++ CA_EVENT_COMPLETE_CWR, /* end of congestion recovery */ ++ CA_EVENT_LOSS, /* loss timeout */ ++ CA_EVENT_FAST_ACK, /* in sequence ack */ ++ CA_EVENT_SLOW_ACK, /* other ack */ ++}; ++ ++/* ++ * Interface for adding new TCP congestion control handlers ++ */ ++#define TCP_CA_NAME_MAX 16 ++#define TCP_CA_MAX 128 ++#define TCP_CA_BUF_MAX (TCP_CA_NAME_MAX*TCP_CA_MAX) ++ ++#define TCP_CONG_NON_RESTRICTED 0x1 ++ ++struct tcp_congestion_ops { ++ struct list_head list; ++ unsigned long flags; ++ ++ /* initialize private data (optional) */ ++ void (*init)(struct sock *sk); ++ /* cleanup private data (optional) */ ++ void (*release)(struct sock *sk); ++ ++ /* return slow start threshold (required) */ ++ u32 (*ssthresh)(struct sock *sk); ++ /* do new cwnd calculation (required) */ ++ void (*cong_avoid)(struct sock *sk, u32 ack, u32 acked, u32 in_flight); ++ /* call before changing ca_state (optional) */ ++ void (*set_state)(struct sock *sk, u8 new_state); ++ /* call when cwnd event occurs (optional) */ ++ void (*cwnd_event)(struct sock *sk, enum tcp_ca_event ev); ++ /* new value of cwnd after loss (optional) */ ++ u32 (*undo_cwnd)(struct sock *sk); ++ /* hook for packet ack accounting (optional) */ ++ void (*pkts_acked)(struct sock *sk, u32 num_acked, s32 rtt_us); ++ /* get info for inet_diag (optional) */ ++ void (*get_info)(struct sock *sk, u32 ext, struct sk_buff *skb); ++ ++ char name[TCP_CA_NAME_MAX]; ++ struct module *owner; ++}; ++ ++int tcp_register_congestion_control(struct tcp_congestion_ops *type); ++void tcp_unregister_congestion_control(struct tcp_congestion_ops *type); ++ ++void tcp_init_congestion_control(struct sock *sk); ++void tcp_cleanup_congestion_control(struct sock *sk); ++int tcp_set_default_congestion_control(const char *name); ++void tcp_get_default_congestion_control(char *name); ++void tcp_get_available_congestion_control(char *buf, size_t len); ++void tcp_get_allowed_congestion_control(char *buf, size_t len); ++int tcp_set_allowed_congestion_control(char *allowed); ++int tcp_set_congestion_control(struct sock *sk, const char *name); ++int tcp_slow_start(struct tcp_sock *tp, u32 acked); ++void tcp_cong_avoid_ai(struct tcp_sock *tp, u32 w); ++ ++extern struct tcp_congestion_ops tcp_init_congestion_ops; ++u32 tcp_reno_ssthresh(struct sock *sk); ++void tcp_reno_cong_avoid(struct sock *sk, u32 ack, u32 acked, u32 in_flight); ++extern struct tcp_congestion_ops tcp_reno; ++ ++static inline void tcp_set_ca_state(struct sock *sk, const u8 ca_state) ++{ ++ struct inet_connection_sock *icsk = inet_csk(sk); ++ ++ if (icsk->icsk_ca_ops->set_state) ++ icsk->icsk_ca_ops->set_state(sk, ca_state); ++ icsk->icsk_ca_state = ca_state; ++} ++ ++static inline void tcp_ca_event(struct sock *sk, const enum tcp_ca_event event) ++{ ++ const struct inet_connection_sock *icsk = inet_csk(sk); ++ ++ if (icsk->icsk_ca_ops->cwnd_event) ++ icsk->icsk_ca_ops->cwnd_event(sk, event); ++} ++ ++/* These functions determine how the current flow behaves in respect of SACK ++ * handling. SACK is negotiated with the peer, and therefore it can vary ++ * between different flows. ++ * ++ * tcp_is_sack - SACK enabled ++ * tcp_is_reno - No SACK ++ * tcp_is_fack - FACK enabled, implies SACK enabled ++ */ ++static inline int tcp_is_sack(const struct tcp_sock *tp) ++{ ++ return tp->rx_opt.sack_ok; ++} ++ ++static inline bool tcp_is_reno(const struct tcp_sock *tp) ++{ ++ return !tcp_is_sack(tp); ++} ++ ++static inline bool tcp_is_fack(const struct tcp_sock *tp) ++{ ++ return tp->rx_opt.sack_ok & TCP_FACK_ENABLED; ++} ++ ++static inline void tcp_enable_fack(struct tcp_sock *tp) ++{ ++ tp->rx_opt.sack_ok |= TCP_FACK_ENABLED; ++} ++ ++/* TCP early-retransmit (ER) is similar to but more conservative than ++ * the thin-dupack feature. Enable ER only if thin-dupack is disabled. ++ */ ++static inline void tcp_enable_early_retrans(struct tcp_sock *tp) ++{ ++ tp->do_early_retrans = sysctl_tcp_early_retrans && ++ sysctl_tcp_early_retrans < 4 && !sysctl_tcp_thin_dupack && ++ sysctl_tcp_reordering == 3; ++} ++ ++static inline void tcp_disable_early_retrans(struct tcp_sock *tp) ++{ ++ tp->do_early_retrans = 0; ++} ++ ++static inline unsigned int tcp_left_out(const struct tcp_sock *tp) ++{ ++ return tp->sacked_out + tp->lost_out; ++} ++ ++/* This determines how many packets are "in the network" to the best ++ * of our knowledge. In many cases it is conservative, but where ++ * detailed information is available from the receiver (via SACK ++ * blocks etc.) we can make more aggressive calculations. ++ * ++ * Use this for decisions involving congestion control, use just ++ * tp->packets_out to determine if the send queue is empty or not. ++ * ++ * Read this equation as: ++ * ++ * "Packets sent once on transmission queue" MINUS ++ * "Packets left network, but not honestly ACKed yet" PLUS ++ * "Packets fast retransmitted" ++ */ ++static inline unsigned int tcp_packets_in_flight(const struct tcp_sock *tp) ++{ ++ return tp->packets_out - tcp_left_out(tp) + tp->retrans_out; ++} ++ ++#define TCP_INFINITE_SSTHRESH 0x7fffffff ++ ++static inline bool tcp_in_initial_slowstart(const struct tcp_sock *tp) ++{ ++ return tp->snd_ssthresh >= TCP_INFINITE_SSTHRESH; ++} ++ ++static inline bool tcp_in_cwnd_reduction(const struct sock *sk) ++{ ++ return (TCPF_CA_CWR | TCPF_CA_Recovery) & ++ (1 << inet_csk(sk)->icsk_ca_state); ++} ++ ++/* If cwnd > ssthresh, we may raise ssthresh to be half-way to cwnd. ++ * The exception is cwnd reduction phase, when cwnd is decreasing towards ++ * ssthresh. ++ */ ++static inlin |