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include/net/tcp.h
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/* * 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 * |
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* Authors: Ross Biro |
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* 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 |
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#define FASTRETRANS_DEBUG 1 |
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#include <linux/list.h> #include <linux/tcp.h> #include <linux/slab.h> #include <linux/cache.h> #include <linux/percpu.h> |
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#include <linux/skbuff.h> |
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#include <linux/dmaengine.h> |
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#include <linux/crypto.h> |
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#include <linux/cryptohash.h> |
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#include <linux/kref.h> |
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#include <net/inet_connection_sock.h> |
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#include <net/inet_timewait_sock.h> |
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#include <net/inet_hashtables.h> |
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#include <net/checksum.h> |
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#include <net/request_sock.h> |
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#include <net/sock.h> #include <net/snmp.h> #include <net/ip.h> |
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#include <net/tcp_states.h> |
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#include <net/inet_ecn.h> |
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#include <net/dst.h> |
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#include <linux/seq_file.h> |
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#include <linux/memcontrol.h> |
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extern struct inet_hashinfo tcp_hashinfo; |
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extern struct percpu_counter tcp_orphan_count; |
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extern void tcp_time_wait(struct sock *sk, int state, int timeo); |
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#define MAX_TCP_HEADER (128 + MAX_HEADER) |
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#define MAX_TCP_OPTION_SPACE 40 |
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/* * Never offer a window over 32767 without using window scaling. Some * poor stacks do signed 16bit maths! */ #define MAX_TCP_WINDOW 32767U |
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/* Offer an initial receive window of 10 mss. */ #define TCP_DEFAULT_INIT_RCVWND 10 |
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/* Minimal accepted MSS. It is (60+60+8) - (20+20). */ #define TCP_MIN_MSS 88U |
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/* The least MTU to use for probing */ #define TCP_BASE_MSS 512 |
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/* 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 5 /* number of times to retry active opening a |
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* connection: ~180sec is RFC minimum */ |
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#define TCP_SYNACK_RETRIES 5 /* number of times to retry passive opening a |
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* connection: ~180sec is RFC minimum */ |
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#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)) |
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#define TCP_TIMEOUT_INIT ((unsigned)(1*HZ)) /* RFC2988bis 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. */ |
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#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 */ |
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#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. */ |
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/* * 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 */ |
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#define TCPOPT_MD5SIG 19 /* MD5 Signature (RFC2385) */ |
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#define TCPOPT_COOKIE 253 /* Cookie extension (experimental) */ |
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/* * TCP option lengths */ #define TCPOLEN_MSS 4 #define TCPOLEN_WINDOW 3 #define TCPOLEN_SACK_PERM 2 #define TCPOLEN_TIMESTAMP 10 |
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#define TCPOLEN_MD5SIG 18 |
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#define TCPOLEN_COOKIE_BASE 2 /* Cookie-less header extension */ #define TCPOLEN_COOKIE_PAIR 3 /* Cookie pair header extension */ #define TCPOLEN_COOKIE_MIN (TCPOLEN_COOKIE_BASE+TCP_COOKIE_MIN) #define TCPOLEN_COOKIE_MAX (TCPOLEN_COOKIE_BASE+TCP_COOKIE_MAX) |
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/* 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 |
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#define TCPOLEN_MD5SIG_ALIGNED 20 |
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#define TCPOLEN_MSS_ALIGNED 4 |
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/* Flags in tp->nonagle */ #define TCP_NAGLE_OFF 1 /* Nagle's algo is disabled */ #define TCP_NAGLE_CORK 2 /* Socket is corked */ |
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#define TCP_NAGLE_PUSH 4 /* Cork is overridden for already queued data */ |
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/* TCP thin-stream limits */ #define TCP_THIN_LINEAR_RETRIES 6 /* After 6 linear retries, do exp. backoff */ |
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/* TCP initial congestion window as per draft-hkchu-tcpm-initcwnd-01 */ |
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#define TCP_INIT_CWND 10 |
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extern struct inet_timewait_death_row tcp_death_row; |
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/* sysctl variables for tcp */ |
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extern int sysctl_tcp_timestamps; extern int sysctl_tcp_window_scaling; extern int sysctl_tcp_sack; extern int sysctl_tcp_fin_timeout; |
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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_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; |
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extern int sysctl_tcp_fack; extern int sysctl_tcp_reordering; extern int sysctl_tcp_ecn; extern int sysctl_tcp_dsack; |
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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; |
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extern int sysctl_tcp_frto_response; |
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extern int sysctl_tcp_low_latency; |
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extern int sysctl_tcp_dma_copybreak; |
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extern int sysctl_tcp_nometrics_save; |
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extern int sysctl_tcp_moderate_rcvbuf; extern int sysctl_tcp_tso_win_divisor; |
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extern int sysctl_tcp_abc; |
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extern int sysctl_tcp_mtu_probing; extern int sysctl_tcp_base_mss; |
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extern int sysctl_tcp_workaround_signed_windows; |
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extern int sysctl_tcp_slow_start_after_idle; |
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extern int sysctl_tcp_max_ssthresh; |
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extern int sysctl_tcp_cookie_size; |
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extern int sysctl_tcp_thin_linear_timeouts; |
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extern int sysctl_tcp_thin_dupack; |
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extern atomic_long_t tcp_memory_allocated; |
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extern struct percpu_counter tcp_sockets_allocated; |
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extern int tcp_memory_pressure; |
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/* |
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* The next routines deal with comparing 32 bit unsigned ints * and worry about wraparound (automatic with unsigned arithmetic). */ static inline int before(__u32 seq1, __u32 seq2) { |
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return (__s32)(seq1-seq2) < 0; |
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} |
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#define after(seq2, seq1) before(seq1, seq2) |
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/* is s2<=s1<=s3 ? */ static inline int between(__u32 seq1, __u32 seq2, __u32 seq3) { return seq3 - seq2 >= seq1 - seq2; } |
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static inline bool tcp_too_many_orphans(struct sock *sk, int shift) |
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{ |
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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; } if (sk->sk_wmem_queued > SOCK_MIN_SNDBUF && |
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sk_memory_allocated(sk) > sk_prot_mem_limits(sk, 2)) |
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return true; return false; |
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} |
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/* 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 int tcp_synq_no_recent_overflow(const struct sock *sk) { unsigned long last_overflow = tcp_sk(sk)->rx_opt.ts_recent_stamp; |
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return time_after(jiffies, last_overflow + TCP_TIMEOUT_FALLBACK); |
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} |
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extern struct proto tcp_prot; |
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#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) |
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#define TCP_ADD_STATS(net, field, val) SNMP_ADD_STATS((net)->mib.tcp_statistics, field, val) |
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extern void tcp_v4_err(struct sk_buff *skb, u32); extern void tcp_shutdown (struct sock *sk, int how); extern int tcp_v4_rcv(struct sk_buff *skb); |
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extern struct inet_peer *tcp_v4_get_peer(struct sock *sk, bool *release_it); |
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extern void *tcp_v4_tw_get_peer(struct sock *sk); |
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extern int tcp_v4_tw_remember_stamp(struct inet_timewait_sock *tw); |
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extern int tcp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, size_t size); extern int tcp_sendpage(struct sock *sk, struct page *page, int offset, size_t size, int flags); |
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extern int tcp_ioctl(struct sock *sk, int cmd, unsigned long arg); extern int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb, |
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const struct tcphdr *th, unsigned int len); |
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extern int tcp_rcv_established(struct sock *sk, struct sk_buff *skb, |
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const struct tcphdr *th, unsigned int len); |
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extern void tcp_rcv_space_adjust(struct sock *sk); extern void tcp_cleanup_rbuf(struct sock *sk, int copied); extern int tcp_twsk_unique(struct sock *sk, struct sock *sktw, void *twp); extern void tcp_twsk_destructor(struct sock *sk); extern ssize_t tcp_splice_read(struct socket *sk, loff_t *ppos, struct pipe_inode_info *pipe, size_t len, unsigned int flags); |
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static inline void tcp_dec_quickack_mode(struct sock *sk, const unsigned int pkts) |
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{ |
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struct inet_connection_sock *icsk = inet_csk(sk); |
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if (icsk->icsk_ack.quick) { if (pkts >= icsk->icsk_ack.quick) { icsk->icsk_ack.quick = 0; |
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/* Leaving quickack mode we deflate ATO. */ |
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icsk->icsk_ack.ato = TCP_ATO_MIN; |
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} else |
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icsk->icsk_ack.quick -= pkts; |
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} } |
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#define TCP_ECN_OK 1 #define TCP_ECN_QUEUE_CWR 2 #define TCP_ECN_DEMAND_CWR 4 |
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#define TCP_ECN_SEEN 8 |
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static __inline__ void TCP_ECN_create_request(struct request_sock *req, struct tcphdr *th) { if (sysctl_tcp_ecn && th->ece && th->cwr) inet_rsk(req)->ecn_ok = 1; } |
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enum tcp_tw_status { |
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TCP_TW_SUCCESS = 0, TCP_TW_RST = 1, TCP_TW_ACK = 2, TCP_TW_SYN = 3 }; |
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extern enum tcp_tw_status tcp_timewait_state_process(struct inet_timewait_sock *tw, struct sk_buff *skb, const struct tcphdr *th); extern struct sock * tcp_check_req(struct sock *sk,struct sk_buff *skb, struct request_sock *req, struct request_sock **prev); extern int tcp_child_process(struct sock *parent, struct sock *child, struct sk_buff *skb); extern int tcp_use_frto(struct sock *sk); extern void tcp_enter_frto(struct sock *sk); extern void tcp_enter_loss(struct sock *sk, int how); extern void tcp_clear_retrans(struct tcp_sock *tp); extern void tcp_update_metrics(struct sock *sk); extern void tcp_close(struct sock *sk, long timeout); extern unsigned int tcp_poll(struct file * file, struct socket *sock, struct poll_table_struct *wait); extern int tcp_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen); extern int tcp_setsockopt(struct sock *sk, int level, int optname, char __user *optval, unsigned int optlen); extern int compat_tcp_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen); extern int compat_tcp_setsockopt(struct sock *sk, int level, int optname, char __user *optval, unsigned int optlen); extern void tcp_set_keepalive(struct sock *sk, int val); extern void tcp_syn_ack_timeout(struct sock *sk, struct request_sock *req); extern int tcp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, size_t len, int nonblock, int flags, int *addr_len); |
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extern void tcp_parse_options(const struct sk_buff *skb, struct tcp_options_received *opt_rx, const u8 **hvpp, |
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int estab); |
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extern const u8 *tcp_parse_md5sig_option(const struct tcphdr *th); |
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/* * TCP v4 functions exported for the inet6 API */ |
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extern void tcp_v4_send_check(struct sock *sk, struct sk_buff *skb); extern int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb); extern struct sock * tcp_create_openreq_child(struct sock *sk, struct request_sock *req, |
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struct sk_buff *skb); |
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extern struct sock * tcp_v4_syn_recv_sock(struct sock *sk, struct sk_buff *skb, struct request_sock *req, struct dst_entry *dst); extern int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb); extern int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); extern int tcp_connect(struct sock *sk); extern struct sk_buff * tcp_make_synack(struct sock *sk, struct dst_entry *dst, struct request_sock *req, struct request_values *rvp); extern int tcp_disconnect(struct sock *sk, int flags); |
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1da177e4c Linux-2.6.12-rc2 |
411 |
/* From syncookies.c */ |
2051f11fb [TCP]: Shrink syn... |
412 |
extern __u32 syncookie_secret[2][16-4+SHA_DIGEST_WORDS]; |
1da177e4c Linux-2.6.12-rc2 |
413 414 |
extern struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb, struct ip_options *opt); |
e05c82d36 tcp: fix build er... |
415 |
#ifdef CONFIG_SYN_COOKIES |
1da177e4c Linux-2.6.12-rc2 |
416 417 |
extern __u32 cookie_v4_init_sequence(struct sock *sk, struct sk_buff *skb, __u16 *mss); |
e05c82d36 tcp: fix build er... |
418 419 420 421 422 423 424 425 |
#else static inline __u32 cookie_v4_init_sequence(struct sock *sk, struct sk_buff *skb, __u16 *mss) { return 0; } #endif |
1da177e4c Linux-2.6.12-rc2 |
426 |
|
4dfc28170 [Syncookies]: Add... |
427 |
extern __u32 cookie_init_timestamp(struct request_sock *req); |
172d69e63 syncookies: add s... |
428 |
extern bool cookie_check_timestamp(struct tcp_options_received *opt, bool *); |
4dfc28170 [Syncookies]: Add... |
429 |
|
c6aefafb7 [TCP]: Add IPv6 s... |
430 431 |
/* From net/ipv6/syncookies.c */ extern struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb); |
e05c82d36 tcp: fix build er... |
432 |
#ifdef CONFIG_SYN_COOKIES |
cf533ea53 tcp: add const qu... |
433 |
extern __u32 cookie_v6_init_sequence(struct sock *sk, const struct sk_buff *skb, |
c6aefafb7 [TCP]: Add IPv6 s... |
434 |
__u16 *mss); |
e05c82d36 tcp: fix build er... |
435 436 437 438 439 440 441 442 |
#else static inline __u32 cookie_v6_init_sequence(struct sock *sk, struct sk_buff *skb, __u16 *mss) { return 0; } #endif |
1da177e4c Linux-2.6.12-rc2 |
443 |
/* tcp_output.c */ |
9e412ba76 [TCP]: Sed magic ... |
444 445 446 |
extern void __tcp_push_pending_frames(struct sock *sk, unsigned int cur_mss, int nonagle); extern int tcp_may_send_now(struct sock *sk); |
1da177e4c Linux-2.6.12-rc2 |
447 |
extern int tcp_retransmit_skb(struct sock *, struct sk_buff *); |
f1ecd5d9e Revert Backoff [v... |
448 |
extern void tcp_retransmit_timer(struct sock *sk); |
1da177e4c Linux-2.6.12-rc2 |
449 450 451 |
extern void tcp_xmit_retransmit_queue(struct sock *); extern void tcp_simple_retransmit(struct sock *); extern int tcp_trim_head(struct sock *, struct sk_buff *, u32); |
6475be16f [TCP]: Keep TSO e... |
452 |
extern int tcp_fragment(struct sock *, struct sk_buff *, u32, unsigned int); |
1da177e4c Linux-2.6.12-rc2 |
453 454 455 |
extern void tcp_send_probe0(struct sock *); extern void tcp_send_partial(struct sock *); |
53d3176b2 net: cleanups |
456 |
extern int tcp_write_wakeup(struct sock *); |
1da177e4c Linux-2.6.12-rc2 |
457 |
extern void tcp_send_fin(struct sock *sk); |
dd0fc66fb [PATCH] gfp flags... |
458 |
extern void tcp_send_active_reset(struct sock *sk, gfp_t priority); |
53d3176b2 net: cleanups |
459 |
extern int tcp_send_synack(struct sock *); |
946cedccb tcp: Change possi... |
460 461 462 |
extern int tcp_syn_flood_action(struct sock *sk, const struct sk_buff *skb, const char *proto); |
c1b4a7e69 [TCP]: Move to ne... |
463 |
extern void tcp_push_one(struct sock *, unsigned int mss_now); |
1da177e4c Linux-2.6.12-rc2 |
464 465 |
extern void tcp_send_ack(struct sock *sk); extern void tcp_send_delayed_ack(struct sock *sk); |
a762a9800 [TCP]: Kill extra... |
466 467 |
/* tcp_input.c */ extern void tcp_cwnd_application_limited(struct sock *sk); |
1da177e4c Linux-2.6.12-rc2 |
468 469 |
/* tcp_timer.c */ extern void tcp_init_xmit_timers(struct sock *); |
463c84b97 [NET]: Introduce ... |
470 471 472 473 |
static inline void tcp_clear_xmit_timers(struct sock *sk) { inet_csk_clear_xmit_timers(sk); } |
1da177e4c Linux-2.6.12-rc2 |
474 |
|
1da177e4c Linux-2.6.12-rc2 |
475 |
extern unsigned int tcp_sync_mss(struct sock *sk, u32 pmtu); |
0c54b85f2 tcp: simplify tcp... |
476 477 478 479 480 |
extern 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) { |
01f83d698 tcp: Prevent over... |
481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 |
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); |
0c54b85f2 tcp: simplify tcp... |
497 498 499 |
else return pktsize; } |
1da177e4c Linux-2.6.12-rc2 |
500 |
|
17b085eac [INET_DIAG]: Move... |
501 |
/* tcp.c */ |
cf533ea53 tcp: add const qu... |
502 |
extern void tcp_get_info(const struct sock *, struct tcp_info *); |
1da177e4c Linux-2.6.12-rc2 |
503 504 505 506 507 508 |
/* Read 'sendfile()'-style from a TCP socket */ typedef int (*sk_read_actor_t)(read_descriptor_t *, struct sk_buff *, unsigned int, size_t); extern int tcp_read_sock(struct sock *sk, read_descriptor_t *desc, sk_read_actor_t recv_actor); |
40efc6fa1 [TCP]: less inline's |
509 |
extern void tcp_initialize_rcv_mss(struct sock *sk); |
1da177e4c Linux-2.6.12-rc2 |
510 |
|
cf533ea53 tcp: add const qu... |
511 512 |
extern int tcp_mtu_to_mss(const struct sock *sk, int pmtu); extern int tcp_mss_to_mtu(const struct sock *sk, int mss); |
5d424d5a6 [TCP]: MTU probing |
513 |
extern void tcp_mtup_init(struct sock *sk); |
9ad7c049f tcp: RFC2988bis +... |
514 |
extern void tcp_valid_rtt_meas(struct sock *sk, u32 seq_rtt); |
5d424d5a6 [TCP]: MTU probing |
515 |
|
f1ecd5d9e Revert Backoff [v... |
516 517 518 519 520 521 522 523 524 525 |
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 (tp->srtt >> 3) + tp->rttvar; } |
40efc6fa1 [TCP]: less inline's |
526 |
static inline void __tcp_fast_path_on(struct tcp_sock *tp, u32 snd_wnd) |
1da177e4c Linux-2.6.12-rc2 |
527 528 529 530 531 |
{ tp->pred_flags = htonl((tp->tcp_header_len << 26) | ntohl(TCP_FLAG_ACK) | snd_wnd); } |
40efc6fa1 [TCP]: less inline's |
532 |
static inline void tcp_fast_path_on(struct tcp_sock *tp) |
1da177e4c Linux-2.6.12-rc2 |
533 534 535 |
{ __tcp_fast_path_on(tp, tp->snd_wnd >> tp->rx_opt.snd_wscale); } |
9e412ba76 [TCP]: Sed magic ... |
536 |
static inline void tcp_fast_path_check(struct sock *sk) |
1da177e4c Linux-2.6.12-rc2 |
537 |
{ |
9e412ba76 [TCP]: Sed magic ... |
538 |
struct tcp_sock *tp = tcp_sk(sk); |
b03efcfb2 [NET]: Transform ... |
539 |
if (skb_queue_empty(&tp->out_of_order_queue) && |
1da177e4c Linux-2.6.12-rc2 |
540 541 542 543 544 |
tp->rcv_wnd && atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf && !tp->urg_data) tcp_fast_path_on(tp); } |
0c266898b tcp: Fix tcp_preq... |
545 546 547 |
/* Compute the actual rto_min value */ static inline u32 tcp_rto_min(struct sock *sk) { |
cf533ea53 tcp: add const qu... |
548 |
const struct dst_entry *dst = __sk_dst_get(sk); |
0c266898b tcp: Fix tcp_preq... |
549 550 551 552 553 554 |
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; } |
1da177e4c Linux-2.6.12-rc2 |
555 556 557 558 |
/* 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. */ |
40efc6fa1 [TCP]: less inline's |
559 |
static inline u32 tcp_receive_window(const struct tcp_sock *tp) |
1da177e4c Linux-2.6.12-rc2 |
560 561 562 563 564 565 566 567 568 569 570 571 |
{ 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. */ |
53d3176b2 net: cleanups |
572 |
extern u32 __tcp_select_window(struct sock *sk); |
1da177e4c Linux-2.6.12-rc2 |
573 574 575 |
/* TCP timestamps are only 32-bits, this causes a slight * complication on 64-bit systems since we store a snapshot |
31f342690 [TCP]: More spell... |
576 577 |
* of jiffies in the buffer control blocks below. We decided * to use only the low 32-bits of jiffies and hide the ugly |
1da177e4c Linux-2.6.12-rc2 |
578 579 580 |
* casts with the following macro. */ #define tcp_time_stamp ((__u32)(jiffies)) |
a3433f35a tcp: unify tcp fl... |
581 582 583 584 585 586 587 588 589 590 |
#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 |
caa20d9ab [TCP]: spelling f... |
591 |
/* This is what the send packet queuing engine uses to pass |
f86586fa4 tcp: sizeof struc... |
592 593 594 595 |
* 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. |
1da177e4c Linux-2.6.12-rc2 |
596 597 598 599 |
*/ struct tcp_skb_cb { union { struct inet_skb_parm h4; |
dfd56b8b3 net: use IS_ENABL... |
600 |
#if IS_ENABLED(CONFIG_IPV6) |
1da177e4c Linux-2.6.12-rc2 |
601 602 603 604 605 606 |
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 */ |
4de075e04 tcp: rename tcp_s... |
607 |
__u8 tcp_flags; /* TCP header flags. (tcp[13]) */ |
1da177e4c Linux-2.6.12-rc2 |
608 609 610 611 612 |
__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 */ |
b82d1bb4f tcp: unalias tcp_... |
613 614 |
__u8 ip_dsfield; /* IPv4 tos or IPv6 dsfield */ /* 1 byte hole */ |
1da177e4c Linux-2.6.12-rc2 |
615 616 |
#define TCPCB_EVER_RETRANS 0x80 /* Ever retransmitted frame */ #define TCPCB_RETRANS (TCPCB_SACKED_RETRANS|TCPCB_EVER_RETRANS) |
1da177e4c Linux-2.6.12-rc2 |
617 618 619 620 |
__u32 ack_seq; /* Sequence number ACK'd */ }; #define TCP_SKB_CB(__skb) ((struct tcp_skb_cb *)&((__skb)->cb[0])) |
1da177e4c Linux-2.6.12-rc2 |
621 622 623 624 625 |
/* 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) { |
7967168ce [NET]: Merge TSO/... |
626 |
return skb_shinfo(skb)->gso_segs; |
1da177e4c Linux-2.6.12-rc2 |
627 628 629 630 631 |
} /* This is valid iff tcp_skb_pcount() > 1. */ static inline int tcp_skb_mss(const struct sk_buff *skb) { |
7967168ce [NET]: Merge TSO/... |
632 |
return skb_shinfo(skb)->gso_size; |
1da177e4c Linux-2.6.12-rc2 |
633 |
} |
317a76f9a [TCP]: Add plugga... |
634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 |
/* 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_FRTO, /* fast recovery timeout */ 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 |
3ff825b28 [TCP]: Add tcp_av... |
649 650 |
#define TCP_CA_MAX 128 #define TCP_CA_BUF_MAX (TCP_CA_NAME_MAX*TCP_CA_MAX) |
164891aad [TCP]: Congestion... |
651 652 |
#define TCP_CONG_NON_RESTRICTED 0x1 #define TCP_CONG_RTT_STAMP 0x2 |
317a76f9a [TCP]: Add plugga... |
653 654 |
struct tcp_congestion_ops { struct list_head list; |
164891aad [TCP]: Congestion... |
655 |
unsigned long flags; |
317a76f9a [TCP]: Add plugga... |
656 657 |
/* initialize private data (optional) */ |
6687e988d [ICSK]: Move TCP ... |
658 |
void (*init)(struct sock *sk); |
317a76f9a [TCP]: Add plugga... |
659 |
/* cleanup private data (optional) */ |
6687e988d [ICSK]: Move TCP ... |
660 |
void (*release)(struct sock *sk); |
317a76f9a [TCP]: Add plugga... |
661 662 |
/* return slow start threshold (required) */ |
6687e988d [ICSK]: Move TCP ... |
663 |
u32 (*ssthresh)(struct sock *sk); |
317a76f9a [TCP]: Add plugga... |
664 |
/* lower bound for congestion window (optional) */ |
72dc5b922 [TCP]: Minimum co... |
665 |
u32 (*min_cwnd)(const struct sock *sk); |
317a76f9a [TCP]: Add plugga... |
666 |
/* do new cwnd calculation (required) */ |
c3a05c605 [TCP]: Cong.ctrl ... |
667 |
void (*cong_avoid)(struct sock *sk, u32 ack, u32 in_flight); |
317a76f9a [TCP]: Add plugga... |
668 |
/* call before changing ca_state (optional) */ |
6687e988d [ICSK]: Move TCP ... |
669 |
void (*set_state)(struct sock *sk, u8 new_state); |
317a76f9a [TCP]: Add plugga... |
670 |
/* call when cwnd event occurs (optional) */ |
6687e988d [ICSK]: Move TCP ... |
671 |
void (*cwnd_event)(struct sock *sk, enum tcp_ca_event ev); |
317a76f9a [TCP]: Add plugga... |
672 |
/* new value of cwnd after loss (optional) */ |
6687e988d [ICSK]: Move TCP ... |
673 |
u32 (*undo_cwnd)(struct sock *sk); |
317a76f9a [TCP]: Add plugga... |
674 |
/* hook for packet ack accounting (optional) */ |
30cfd0baf [TCP]: congestion... |
675 |
void (*pkts_acked)(struct sock *sk, u32 num_acked, s32 rtt_us); |
73c1f4a03 [TCPDIAG]: Just r... |
676 |
/* get info for inet_diag (optional) */ |
6687e988d [ICSK]: Move TCP ... |
677 |
void (*get_info)(struct sock *sk, u32 ext, struct sk_buff *skb); |
317a76f9a [TCP]: Add plugga... |
678 679 680 681 682 683 684 |
char name[TCP_CA_NAME_MAX]; struct module *owner; }; extern int tcp_register_congestion_control(struct tcp_congestion_ops *type); extern void tcp_unregister_congestion_control(struct tcp_congestion_ops *type); |
6687e988d [ICSK]: Move TCP ... |
685 686 |
extern void tcp_init_congestion_control(struct sock *sk); extern void tcp_cleanup_congestion_control(struct sock *sk); |
317a76f9a [TCP]: Add plugga... |
687 688 |
extern int tcp_set_default_congestion_control(const char *name); extern void tcp_get_default_congestion_control(char *name); |
3ff825b28 [TCP]: Add tcp_av... |
689 |
extern void tcp_get_available_congestion_control(char *buf, size_t len); |
ce7bc3bf1 [TCP]: Restrict c... |
690 691 |
extern void tcp_get_allowed_congestion_control(char *buf, size_t len); extern int tcp_set_allowed_congestion_control(char *allowed); |
6687e988d [ICSK]: Move TCP ... |
692 |
extern int tcp_set_congestion_control(struct sock *sk, const char *name); |
40efc6fa1 [TCP]: less inline's |
693 |
extern void tcp_slow_start(struct tcp_sock *tp); |
758ce5c8d tcp: add helper f... |
694 |
extern void tcp_cong_avoid_ai(struct tcp_sock *tp, u32 w); |
317a76f9a [TCP]: Add plugga... |
695 |
|
5f8ef48d2 [TCP]: Allow choo... |
696 |
extern struct tcp_congestion_ops tcp_init_congestion_ops; |
6687e988d [ICSK]: Move TCP ... |
697 |
extern u32 tcp_reno_ssthresh(struct sock *sk); |
c3a05c605 [TCP]: Cong.ctrl ... |
698 |
extern void tcp_reno_cong_avoid(struct sock *sk, u32 ack, u32 in_flight); |
72dc5b922 [TCP]: Minimum co... |
699 |
extern u32 tcp_reno_min_cwnd(const struct sock *sk); |
a8acfbac7 [TCP]: Need to de... |
700 |
extern struct tcp_congestion_ops tcp_reno; |
317a76f9a [TCP]: Add plugga... |
701 |
|
6687e988d [ICSK]: Move TCP ... |
702 |
static inline void tcp_set_ca_state(struct sock *sk, const u8 ca_state) |
317a76f9a [TCP]: Add plugga... |
703 |
{ |
6687e988d [ICSK]: Move TCP ... |
704 705 706 707 708 |
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; |
317a76f9a [TCP]: Add plugga... |
709 |
} |
6687e988d [ICSK]: Move TCP ... |
710 |
static inline void tcp_ca_event(struct sock *sk, const enum tcp_ca_event event) |
317a76f9a [TCP]: Add plugga... |
711 |
{ |
6687e988d [ICSK]: Move TCP ... |
712 713 714 715 |
const struct inet_connection_sock *icsk = inet_csk(sk); if (icsk->icsk_ca_ops->cwnd_event) icsk->icsk_ca_ops->cwnd_event(sk, event); |
317a76f9a [TCP]: Add plugga... |
716 |
} |
e60402d0a [TCP]: Move sack_... |
717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 |
/* 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 int tcp_is_reno(const struct tcp_sock *tp) { return !tcp_is_sack(tp); } static inline int tcp_is_fack(const struct tcp_sock *tp) { |
ab56222a3 tcp: Replace cons... |
737 |
return tp->rx_opt.sack_ok & TCP_FACK_ENABLED; |
e60402d0a [TCP]: Move sack_... |
738 739 740 741 |
} static inline void tcp_enable_fack(struct tcp_sock *tp) { |
ab56222a3 tcp: Replace cons... |
742 |
tp->rx_opt.sack_ok |= TCP_FACK_ENABLED; |
e60402d0a [TCP]: Move sack_... |
743 |
} |
83ae40885 [TCP]: Add tcp_le... |
744 745 746 747 |
static inline unsigned int tcp_left_out(const struct tcp_sock *tp) { return tp->sacked_out + tp->lost_out; } |
1da177e4c Linux-2.6.12-rc2 |
748 749 750 751 752 753 754 755 756 757 758 759 760 761 |
/* 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" */ |
40efc6fa1 [TCP]: less inline's |
762 |
static inline unsigned int tcp_packets_in_flight(const struct tcp_sock *tp) |
1da177e4c Linux-2.6.12-rc2 |
763 |
{ |
83ae40885 [TCP]: Add tcp_le... |
764 |
return tp->packets_out - tcp_left_out(tp) + tp->retrans_out; |
1da177e4c Linux-2.6.12-rc2 |
765 |
} |
0b6a05c1d tcp: fix ssthresh... |
766 767 768 769 770 771 |
#define TCP_INFINITE_SSTHRESH 0x7fffffff static inline bool tcp_in_initial_slowstart(const struct tcp_sock *tp) { return tp->snd_ssthresh >= TCP_INFINITE_SSTHRESH; } |
1da177e4c Linux-2.6.12-rc2 |
772 773 774 775 |
/* If cwnd > ssthresh, we may raise ssthresh to be half-way to cwnd. * The exception is rate halving phase, when cwnd is decreasing towards * ssthresh. */ |
6687e988d [ICSK]: Move TCP ... |
776 |
static inline __u32 tcp_current_ssthresh(const struct sock *sk) |
1da177e4c Linux-2.6.12-rc2 |
777 |
{ |
6687e988d [ICSK]: Move TCP ... |
778 |
const struct tcp_sock *tp = tcp_sk(sk); |
cf533ea53 tcp: add const qu... |
779 |
|
6687e988d [ICSK]: Move TCP ... |
780 |
if ((1 << inet_csk(sk)->icsk_ca_state) & (TCPF_CA_CWR | TCPF_CA_Recovery)) |
1da177e4c Linux-2.6.12-rc2 |
781 782 783 784 785 786 |
return tp->snd_ssthresh; else return max(tp->snd_ssthresh, ((tp->snd_cwnd >> 1) + (tp->snd_cwnd >> 2))); } |
b9c4595bc [TCP]: Don't pani... |
787 788 |
/* Use define here intentionally to get WARN_ON location shown at the caller */ #define tcp_verify_left_out(tp) WARN_ON(tcp_left_out(tp) > tp->packets_out) |
1da177e4c Linux-2.6.12-rc2 |
789 |
|
3cfe3baaf [TCP]: Add two ne... |
790 |
extern void tcp_enter_cwr(struct sock *sk, const int set_ssthresh); |
cf533ea53 tcp: add const qu... |
791 |
extern __u32 tcp_init_cwnd(const struct tcp_sock *tp, const struct dst_entry *dst); |
1da177e4c Linux-2.6.12-rc2 |
792 |
|
6b5a5c0db tcp: do not scale... |
793 794 795 796 797 798 799 |
/* The maximum number of MSS of available cwnd for which TSO defers * sending if not using sysctl_tcp_tso_win_divisor. */ static inline __u32 tcp_max_tso_deferred_mss(const struct tcp_sock *tp) { return 3; } |
1da177e4c Linux-2.6.12-rc2 |
800 |
/* Slow start with delack produces 3 packets of burst, so that |
dd9e0dda6 [TCP]: Increase t... |
801 802 803 804 |
* it is safe "de facto". This will be the default - same as * the default reordering threshold - but if reordering increases, * we must be able to allow cwnd to burst at least this much in order * to not pull it back when holes are filled. |
1da177e4c Linux-2.6.12-rc2 |
805 806 807 |
*/ static __inline__ __u32 tcp_max_burst(const struct tcp_sock *tp) { |
dd9e0dda6 [TCP]: Increase t... |
808 |
return tp->reordering; |
1da177e4c Linux-2.6.12-rc2 |
809 |
} |
90840defa [TCP]: Introduce ... |
810 811 812 813 814 |
/* Returns end sequence number of the receiver's advertised window */ static inline u32 tcp_wnd_end(const struct tcp_sock *tp) { return tp->snd_una + tp->snd_wnd; } |
cea14e0ed [TCP]: Uninline t... |
815 |
extern int tcp_is_cwnd_limited(const struct sock *sk, u32 in_flight); |
f4805eded [TCP]: fix conges... |
816 |
|
c1bd24b76 [TCP]: Remove unn... |
817 |
static inline void tcp_minshall_update(struct tcp_sock *tp, unsigned int mss, |
40efc6fa1 [TCP]: less inline's |
818 |
const struct sk_buff *skb) |
1da177e4c Linux-2.6.12-rc2 |
819 820 821 822 |
{ if (skb->len < mss) tp->snd_sml = TCP_SKB_CB(skb)->end_seq; } |
9e412ba76 [TCP]: Sed magic ... |
823 |
static inline void tcp_check_probe_timer(struct sock *sk) |
1da177e4c Linux-2.6.12-rc2 |
824 |
{ |
cf533ea53 tcp: add const qu... |
825 |
const struct tcp_sock *tp = tcp_sk(sk); |
463c84b97 [NET]: Introduce ... |
826 |
const struct inet_connection_sock *icsk = inet_csk(sk); |
9e412ba76 [TCP]: Sed magic ... |
827 |
|
463c84b97 [NET]: Introduce ... |
828 |
if (!tp->packets_out && !icsk->icsk_pending) |
3f421baa4 [NET]: Just move ... |
829 830 |
inet_csk_reset_xmit_timer(sk, ICSK_TIME_PROBE0, icsk->icsk_rto, TCP_RTO_MAX); |
1da177e4c Linux-2.6.12-rc2 |
831 |
} |
ee7537b63 tcp: tcp_init_wl ... |
832 |
static inline void tcp_init_wl(struct tcp_sock *tp, u32 seq) |
1da177e4c Linux-2.6.12-rc2 |
833 834 835 |
{ tp->snd_wl1 = seq; } |
ee7537b63 tcp: tcp_init_wl ... |
836 |
static inline void tcp_update_wl(struct tcp_sock *tp, u32 seq) |
1da177e4c Linux-2.6.12-rc2 |
837 838 839 |
{ tp->snd_wl1 = seq; } |
1da177e4c Linux-2.6.12-rc2 |
840 841 842 |
/* * Calculate(/check) TCP checksum */ |
ba7808eac [TCP]: remove tcp... |
843 844 |
static inline __sum16 tcp_v4_check(int len, __be32 saddr, __be32 daddr, __wsum base) |
1da177e4c Linux-2.6.12-rc2 |
845 846 847 |
{ return csum_tcpudp_magic(saddr,daddr,len,IPPROTO_TCP,base); } |
b51655b95 [NET]: Annotate _... |
848 |
static inline __sum16 __tcp_checksum_complete(struct sk_buff *skb) |
1da177e4c Linux-2.6.12-rc2 |
849 |
{ |
fb286bb29 [NET]: Detect har... |
850 |
return __skb_checksum_complete(skb); |
1da177e4c Linux-2.6.12-rc2 |
851 |
} |
40efc6fa1 [TCP]: less inline's |
852 |
static inline int tcp_checksum_complete(struct sk_buff *skb) |
1da177e4c Linux-2.6.12-rc2 |
853 |
{ |
604763722 [NET]: Treat CHEC... |
854 |
return !skb_csum_unnecessary(skb) && |
1da177e4c Linux-2.6.12-rc2 |
855 856 857 858 |
__tcp_checksum_complete(skb); } /* Prequeue for VJ style copy to user, combined with checksumming. */ |
40efc6fa1 [TCP]: less inline's |
859 |
static inline void tcp_prequeue_init(struct tcp_sock *tp) |
1da177e4c Linux-2.6.12-rc2 |
860 861 862 863 864 |
{ tp->ucopy.task = NULL; tp->ucopy.len = 0; tp->ucopy.memory = 0; skb_queue_head_init(&tp->ucopy.prequeue); |
97fc2f084 [I/OAT]: Structur... |
865 866 867 868 869 870 |
#ifdef CONFIG_NET_DMA tp->ucopy.dma_chan = NULL; tp->ucopy.wakeup = 0; tp->ucopy.pinned_list = NULL; tp->ucopy.dma_cookie = 0; #endif |
1da177e4c Linux-2.6.12-rc2 |
871 872 873 874 875 876 877 878 879 880 |
} /* 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 * * NOTE: is this not too big to inline? */ |
40efc6fa1 [TCP]: less inline's |
881 |
static inline int tcp_prequeue(struct sock *sk, struct sk_buff *skb) |
1da177e4c Linux-2.6.12-rc2 |
882 883 |
{ struct tcp_sock *tp = tcp_sk(sk); |
f5f8d86b2 tcp: tcp_prequeue... |
884 885 886 887 888 889 890 891 892 893 894 895 896 897 |
if (sysctl_tcp_low_latency || !tp->ucopy.task) return 0; __skb_queue_tail(&tp->ucopy.prequeue, skb); tp->ucopy.memory += skb->truesize; if (tp->ucopy.memory > sk->sk_rcvbuf) { struct sk_buff *skb1; BUG_ON(sock_owned_by_user(sk)); while ((skb1 = __skb_dequeue(&tp->ucopy.prequeue)) != NULL) { sk_backlog_rcv(sk, skb1); NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPPREQUEUEDROPPED); |
1da177e4c Linux-2.6.12-rc2 |
898 |
} |
f5f8d86b2 tcp: tcp_prequeue... |
899 900 901 |
tp->ucopy.memory = 0; } else if (skb_queue_len(&tp->ucopy.prequeue) == 1) { |
aa3951451 net: sk_sleep() h... |
902 |
wake_up_interruptible_sync_poll(sk_sleep(sk), |
7aedec2ad tcp: tcp_prequeue... |
903 |
POLLIN | POLLRDNORM | POLLRDBAND); |
f5f8d86b2 tcp: tcp_prequeue... |
904 905 |
if (!inet_csk_ack_scheduled(sk)) inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK, |
22f6dacdf Merge branch 'mas... |
906 |
(3 * tcp_rto_min(sk)) / 4, |
f5f8d86b2 tcp: tcp_prequeue... |
907 |
TCP_RTO_MAX); |
1da177e4c Linux-2.6.12-rc2 |
908 |
} |
f5f8d86b2 tcp: tcp_prequeue... |
909 |
return 1; |
1da177e4c Linux-2.6.12-rc2 |
910 911 912 913 914 915 916 917 918 919 920 921 |
} #undef STATE_TRACE #ifdef STATE_TRACE static const char *statename[]={ "Unused","Established","Syn Sent","Syn Recv", "Fin Wait 1","Fin Wait 2","Time Wait", "Close", "Close Wait","Last ACK","Listen","Closing" }; #endif |
490d50469 [TCP]: Uninline t... |
922 |
extern void tcp_set_state(struct sock *sk, int state); |
1da177e4c Linux-2.6.12-rc2 |
923 |
|
4ac02bab7 [TCP]: Uninline t... |
924 |
extern void tcp_done(struct sock *sk); |
1da177e4c Linux-2.6.12-rc2 |
925 |
|
40efc6fa1 [TCP]: less inline's |
926 |
static inline void tcp_sack_reset(struct tcp_options_received *rx_opt) |
1da177e4c Linux-2.6.12-rc2 |
927 928 |
{ rx_opt->dsack = 0; |
1da177e4c Linux-2.6.12-rc2 |
929 930 |
rx_opt->num_sacks = 0; } |
1da177e4c Linux-2.6.12-rc2 |
931 932 933 |
/* Determine a window scaling and initial window to offer. */ extern void tcp_select_initial_window(int __space, __u32 mss, __u32 *rcv_wnd, __u32 *window_clamp, |
31d12926e net: Add rtnetlin... |
934 935 |
int wscale_ok, __u8 *rcv_wscale, __u32 init_rcv_wnd); |
1da177e4c Linux-2.6.12-rc2 |
936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 |
static inline int tcp_win_from_space(int space) { return sysctl_tcp_adv_win_scale<=0 ? (space>>(-sysctl_tcp_adv_win_scale)) : space - (space>>sysctl_tcp_adv_win_scale); } /* Note: caller must be prepared to deal with negative returns */ static inline int tcp_space(const struct sock *sk) { return tcp_win_from_space(sk->sk_rcvbuf - atomic_read(&sk->sk_rmem_alloc)); } static inline int tcp_full_space(const struct sock *sk) { return tcp_win_from_space(sk->sk_rcvbuf); } |
40efc6fa1 [TCP]: less inline's |
955 956 957 |
static inline void tcp_openreq_init(struct request_sock *req, struct tcp_options_received *rx_opt, struct sk_buff *skb) |
1da177e4c Linux-2.6.12-rc2 |
958 |
{ |
2e6599cb8 [NET] Generalise ... |
959 |
struct inet_request_sock *ireq = inet_rsk(req); |
1da177e4c Linux-2.6.12-rc2 |
960 |
req->rcv_wnd = 0; /* So that tcp_send_synack() knows! */ |
4dfc28170 [Syncookies]: Add... |
961 |
req->cookie_ts = 0; |
2e6599cb8 [NET] Generalise ... |
962 |
tcp_rsk(req)->rcv_isn = TCP_SKB_CB(skb)->seq; |
1da177e4c Linux-2.6.12-rc2 |
963 964 |
req->mss = rx_opt->mss_clamp; req->ts_recent = rx_opt->saw_tstamp ? rx_opt->rcv_tsval : 0; |
2e6599cb8 [NET] Generalise ... |
965 966 967 968 969 970 |
ireq->tstamp_ok = rx_opt->tstamp_ok; ireq->sack_ok = rx_opt->sack_ok; ireq->snd_wscale = rx_opt->snd_wscale; ireq->wscale_ok = rx_opt->wscale_ok; ireq->acked = 0; ireq->ecn_ok = 0; |
aa8223c7b [SK_BUFF]: Introd... |
971 |
ireq->rmt_port = tcp_hdr(skb)->source; |
a3116ac5c tcp: Port redirec... |
972 |
ireq->loc_port = tcp_hdr(skb)->dest; |
1da177e4c Linux-2.6.12-rc2 |
973 |
} |
5c52ba170 sock: add net to ... |
974 |
extern void tcp_enter_memory_pressure(struct sock *sk); |
1da177e4c Linux-2.6.12-rc2 |
975 |
|
1da177e4c Linux-2.6.12-rc2 |
976 977 978 979 980 981 982 983 984 |
static inline int keepalive_intvl_when(const struct tcp_sock *tp) { return tp->keepalive_intvl ? : sysctl_tcp_keepalive_intvl; } static inline int keepalive_time_when(const struct tcp_sock *tp) { return tp->keepalive_time ? : sysctl_tcp_keepalive_time; } |
df19a6267 tcp: keepalive cl... |
985 986 987 988 |
static inline int keepalive_probes(const struct tcp_sock *tp) { return tp->keepalive_probes ? : sysctl_tcp_keepalive_probes; } |
6c37e5de4 TCP: avoid to sen... |
989 990 991 992 993 994 995 |
static inline u32 keepalive_time_elapsed(const struct tcp_sock *tp) { const struct inet_connection_sock *icsk = &tp->inet_conn; return min_t(u32, tcp_time_stamp - icsk->icsk_ack.lrcvtime, tcp_time_stamp - tp->rcv_tstamp); } |
463c84b97 [NET]: Introduce ... |
996 |
static inline int tcp_fin_time(const struct sock *sk) |
1da177e4c Linux-2.6.12-rc2 |
997 |
{ |
463c84b97 [NET]: Introduce ... |
998 999 |
int fin_timeout = tcp_sk(sk)->linger2 ? : sysctl_tcp_fin_timeout; const int rto = inet_csk(sk)->icsk_rto; |
1da177e4c Linux-2.6.12-rc2 |
1000 |
|
463c84b97 [NET]: Introduce ... |
1001 1002 |
if (fin_timeout < (rto << 2) - (rto >> 1)) fin_timeout = (rto << 2) - (rto >> 1); |
1da177e4c Linux-2.6.12-rc2 |
1003 1004 1005 |
return fin_timeout; } |
c887e6d2d tcp: consolidate ... |
1006 1007 |
static inline int tcp_paws_check(const struct tcp_options_received *rx_opt, int paws_win) |
1da177e4c Linux-2.6.12-rc2 |
1008 |
{ |
c887e6d2d tcp: consolidate ... |
1009 1010 1011 1012 |
if ((s32)(rx_opt->ts_recent - rx_opt->rcv_tsval) <= paws_win) return 1; if (unlikely(get_seconds() >= rx_opt->ts_recent_stamp + TCP_PAWS_24DAYS)) return 1; |
bc2ce894e tcp: relax tcp_pa... |
1013 1014 1015 1016 1017 1018 1019 |
/* * Some OSes send SYN and SYNACK messages with tsval=0 tsecr=0, * then following tcp messages have valid values. Ignore 0 value, * or else 'negative' tsval might forbid us to accept their packets. */ if (!rx_opt->ts_recent) return 1; |
c887e6d2d tcp: consolidate ... |
1020 1021 1022 1023 1024 1025 1026 |
return 0; } static inline int tcp_paws_reject(const struct tcp_options_received *rx_opt, int rst) { if (tcp_paws_check(rx_opt, 0)) |
1da177e4c Linux-2.6.12-rc2 |
1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 |
return 0; /* RST segments are not recommended to carry timestamp, and, if they do, it is recommended to ignore PAWS because "their cleanup function should take precedence over timestamps." Certainly, it is mistake. It is necessary to understand the reasons of this constraint to relax it: if peer reboots, clock may go out-of-sync and half-open connections will not be reset. Actually, the problem would be not existing if all the implementations followed draft about maintaining clock via reboots. Linux-2.2 DOES NOT! However, we can relax time bounds for RST segments to MSL. */ |
9d729f72d [NET]: Convert xt... |
1041 |
if (rst && get_seconds() >= rx_opt->ts_recent_stamp + TCP_PAWS_MSL) |
1da177e4c Linux-2.6.12-rc2 |
1042 1043 1044 |
return 0; return 1; } |
a9c19329e tcp: add net to t... |
1045 |
static inline void tcp_mib_init(struct net *net) |
1da177e4c Linux-2.6.12-rc2 |
1046 1047 |
{ /* See RFC 2012 */ |
cf1100a7a mib: add net to T... |
1048 1049 1050 1051 |
TCP_ADD_STATS_USER(net, TCP_MIB_RTOALGORITHM, 1); TCP_ADD_STATS_USER(net, TCP_MIB_RTOMIN, TCP_RTO_MIN*1000/HZ); TCP_ADD_STATS_USER(net, TCP_MIB_RTOMAX, TCP_RTO_MAX*1000/HZ); TCP_ADD_STATS_USER(net, TCP_MIB_MAXCONN, -1); |
1da177e4c Linux-2.6.12-rc2 |
1052 |
} |
5af4ec236 [TCP]: clear_all_... |
1053 |
/* from STCP */ |
ef9da47c7 tcp: don't clear ... |
1054 |
static inline void tcp_clear_retrans_hints_partial(struct tcp_sock *tp) |
0800f1702 [TCP]: Minor codi... |
1055 |
{ |
6a438bbe6 [TCP]: speed up S... |
1056 1057 |
tp->lost_skb_hint = NULL; tp->scoreboard_skb_hint = NULL; |
ef9da47c7 tcp: don't clear ... |
1058 1059 1060 1061 1062 |
} static inline void tcp_clear_all_retrans_hints(struct tcp_sock *tp) { tcp_clear_retrans_hints_partial(tp); |
6a438bbe6 [TCP]: speed up S... |
1063 |
tp->retransmit_skb_hint = NULL; |
b76892051 [TCP]: Avoid clea... |
1064 |
} |
cfb6eeb4c [TCP]: MD5 Signat... |
1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 |
/* MD5 Signature */ struct crypto_hash; /* - key database */ struct tcp_md5sig_key { u8 *key; u8 keylen; }; struct tcp4_md5sig_key { |
f8ab18d2d [TCP]: Fix MD5 si... |
1075 |
struct tcp_md5sig_key base; |
cfb6eeb4c [TCP]: MD5 Signat... |
1076 1077 1078 1079 |
__be32 addr; }; struct tcp6_md5sig_key { |
f8ab18d2d [TCP]: Fix MD5 si... |
1080 |
struct tcp_md5sig_key base; |
cfb6eeb4c [TCP]: MD5 Signat... |
1081 1082 1083 1084 1085 1086 1087 1088 1089 |
#if 0 u32 scope_id; /* XXX */ #endif struct in6_addr addr; }; /* - sock block */ struct tcp_md5sig_info { struct tcp4_md5sig_key *keys4; |
dfd56b8b3 net: use IS_ENABL... |
1090 |
#if IS_ENABLED(CONFIG_IPV6) |
cfb6eeb4c [TCP]: MD5 Signat... |
1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 |
struct tcp6_md5sig_key *keys6; u32 entries6; u32 alloced6; #endif u32 entries4; u32 alloced4; }; /* - pseudo header */ struct tcp4_pseudohdr { __be32 saddr; __be32 daddr; __u8 pad; __u8 protocol; __be16 len; }; struct tcp6_pseudohdr { struct in6_addr saddr; struct in6_addr daddr; __be32 len; __be32 protocol; /* including padding */ }; union tcp_md5sum_block { struct tcp4_pseudohdr ip4; |
dfd56b8b3 net: use IS_ENABL... |
1117 |
#if IS_ENABLED(CONFIG_IPV6) |
cfb6eeb4c [TCP]: MD5 Signat... |
1118 1119 1120 1121 1122 1123 1124 1125 1126 |
struct tcp6_pseudohdr ip6; #endif }; /* - pool: digest algorithm, hash description and scratch buffer */ struct tcp_md5sig_pool { struct hash_desc md5_desc; union tcp_md5sum_block md5_blk; }; |
cfb6eeb4c [TCP]: MD5 Signat... |
1127 |
/* - functions */ |
53d3176b2 net: cleanups |
1128 |
extern int tcp_v4_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key, |
318cf7aaa tcp: md5: add mor... |
1129 1130 1131 |
const struct sock *sk, const struct request_sock *req, const struct sk_buff *skb); |
53d3176b2 net: cleanups |
1132 1133 1134 1135 1136 |
extern struct tcp_md5sig_key * tcp_v4_md5_lookup(struct sock *sk, struct sock *addr_sk); extern int tcp_v4_md5_do_add(struct sock *sk, __be32 addr, u8 *newkey, u8 newkeylen); extern int tcp_v4_md5_do_del(struct sock *sk, __be32 addr); |
cfb6eeb4c [TCP]: MD5 Signat... |
1137 |
|
9501f9722 tcp md5sig: Let t... |
1138 1139 1140 1141 1142 1143 1144 1145 1146 |
#ifdef CONFIG_TCP_MD5SIG #define tcp_twsk_md5_key(twsk) ((twsk)->tw_md5_keylen ? \ &(struct tcp_md5sig_key) { \ .key = (twsk)->tw_md5_key, \ .keylen = (twsk)->tw_md5_keylen, \ } : NULL) #else #define tcp_twsk_md5_key(twsk) NULL #endif |
765cf9976 tcp: md5: remove ... |
1147 |
extern struct tcp_md5sig_pool __percpu *tcp_alloc_md5sig_pool(struct sock *); |
53d3176b2 net: cleanups |
1148 |
extern void tcp_free_md5sig_pool(void); |
cfb6eeb4c [TCP]: MD5 Signat... |
1149 |
|
35790c042 tcp: fix MD5 (RFC... |
1150 |
extern struct tcp_md5sig_pool *tcp_get_md5sig_pool(void); |
53d3176b2 net: cleanups |
1151 |
extern void tcp_put_md5sig_pool(void); |
35790c042 tcp: fix MD5 (RFC... |
1152 |
|
ca35a0ef8 tcp: md5: dont wr... |
1153 |
extern int tcp_md5_hash_header(struct tcp_md5sig_pool *, const struct tcphdr *); |
cf533ea53 tcp: add const qu... |
1154 |
extern int tcp_md5_hash_skb_data(struct tcp_md5sig_pool *, const struct sk_buff *, |
49a72dfb8 tcp: Fix MD5 sign... |
1155 1156 |
unsigned header_len); extern int tcp_md5_hash_key(struct tcp_md5sig_pool *hp, |
cf533ea53 tcp: add const qu... |
1157 |
const struct tcp_md5sig_key *key); |
cfb6eeb4c [TCP]: MD5 Signat... |
1158 |
|
fe067e8ab [TCP]: Abstract o... |
1159 1160 1161 1162 1163 1164 |
/* write queue abstraction */ static inline void tcp_write_queue_purge(struct sock *sk) { struct sk_buff *skb; while ((skb = __skb_dequeue(&sk->sk_write_queue)) != NULL) |
3ab224be6 [NET] CORE: Intro... |
1165 1166 |
sk_wmem_free_skb(sk, skb); sk_mem_reclaim(sk); |
8818a9d88 tcp: clear hints ... |
1167 |
tcp_clear_all_retrans_hints(tcp_sk(sk)); |
fe067e8ab [TCP]: Abstract o... |
1168 |
} |
cf533ea53 tcp: add const qu... |
1169 |
static inline struct sk_buff *tcp_write_queue_head(const struct sock *sk) |
fe067e8ab [TCP]: Abstract o... |
1170 |
{ |
cd07a8ea0 tcp: Use SKB queu... |
1171 |
return skb_peek(&sk->sk_write_queue); |
fe067e8ab [TCP]: Abstract o... |
1172 |
} |
cf533ea53 tcp: add const qu... |
1173 |
static inline struct sk_buff *tcp_write_queue_tail(const struct sock *sk) |
fe067e8ab [TCP]: Abstract o... |
1174 |
{ |
cd07a8ea0 tcp: Use SKB queu... |
1175 |
return skb_peek_tail(&sk->sk_write_queue); |
fe067e8ab [TCP]: Abstract o... |
1176 |
} |
cf533ea53 tcp: add const qu... |
1177 1178 |
static inline struct sk_buff *tcp_write_queue_next(const struct sock *sk, const struct sk_buff *skb) |
fe067e8ab [TCP]: Abstract o... |
1179 |
{ |
cd07a8ea0 tcp: Use SKB queu... |
1180 |
return skb_queue_next(&sk->sk_write_queue, skb); |
fe067e8ab [TCP]: Abstract o... |
1181 |
} |
cf533ea53 tcp: add const qu... |
1182 1183 |
static inline struct sk_buff *tcp_write_queue_prev(const struct sock *sk, const struct sk_buff *skb) |
832d11c5c tcp: Try to resto... |
1184 1185 1186 |
{ return skb_queue_prev(&sk->sk_write_queue, skb); } |
fe067e8ab [TCP]: Abstract o... |
1187 |
#define tcp_for_write_queue(skb, sk) \ |
cd07a8ea0 tcp: Use SKB queu... |
1188 |
skb_queue_walk(&(sk)->sk_write_queue, skb) |
fe067e8ab [TCP]: Abstract o... |
1189 1190 |
#define tcp_for_write_queue_from(skb, sk) \ |
cd07a8ea0 tcp: Use SKB queu... |
1191 |
skb_queue_walk_from(&(sk)->sk_write_queue, skb) |
fe067e8ab [TCP]: Abstract o... |
1192 |
|
234b68607 [TCP]: Add tcp_fo... |
1193 |
#define tcp_for_write_queue_from_safe(skb, tmp, sk) \ |
cd07a8ea0 tcp: Use SKB queu... |
1194 |
skb_queue_walk_from_safe(&(sk)->sk_write_queue, skb, tmp) |
234b68607 [TCP]: Add tcp_fo... |
1195 |
|
cf533ea53 tcp: add const qu... |
1196 |
static inline struct sk_buff *tcp_send_head(const struct sock *sk) |
fe067e8ab [TCP]: Abstract o... |
1197 1198 1199 |
{ return sk->sk_send_head; } |
cd07a8ea0 tcp: Use SKB queu... |
1200 1201 1202 1203 1204 |
static inline bool tcp_skb_is_last(const struct sock *sk, const struct sk_buff *skb) { return skb_queue_is_last(&sk->sk_write_queue, skb); } |
cf533ea53 tcp: add const qu... |
1205 |
static inline void tcp_advance_send_head(struct sock *sk, const struct sk_buff *skb) |
fe067e8ab [TCP]: Abstract o... |
1206 |
{ |
cd07a8ea0 tcp: Use SKB queu... |
1207 |
if (tcp_skb_is_last(sk, skb)) |
fe067e8ab [TCP]: Abstract o... |
1208 |
sk->sk_send_head = NULL; |
cd07a8ea0 tcp: Use SKB queu... |
1209 1210 |
else sk->sk_send_head = tcp_write_queue_next(sk, skb); |
fe067e8ab [TCP]: Abstract o... |
1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 |
} static inline void tcp_check_send_head(struct sock *sk, struct sk_buff *skb_unlinked) { if (sk->sk_send_head == skb_unlinked) sk->sk_send_head = NULL; } static inline void tcp_init_send_head(struct sock *sk) { sk->sk_send_head = NULL; } static inline void __tcp_add_write_queue_tail(struct sock *sk, struct sk_buff *skb) { __skb_queue_tail(&sk->sk_write_queue, skb); } static inline void tcp_add_write_queue_tail(struct sock *sk, struct sk_buff *skb) { __tcp_add_write_queue_tail(sk, skb); /* Queue it, remembering where we must start sending. */ |
6859d4947 [TCP]: Abstract t... |
1234 |
if (sk->sk_send_head == NULL) { |
fe067e8ab [TCP]: Abstract o... |
1235 |
sk->sk_send_head = skb; |
6859d4947 [TCP]: Abstract t... |
1236 1237 1238 1239 |
if (tcp_sk(sk)->highest_sack == NULL) tcp_sk(sk)->highest_sack = skb; } |
fe067e8ab [TCP]: Abstract o... |
1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 |
} static inline void __tcp_add_write_queue_head(struct sock *sk, struct sk_buff *skb) { __skb_queue_head(&sk->sk_write_queue, skb); } /* Insert buff after skb on the write queue of sk. */ static inline void tcp_insert_write_queue_after(struct sk_buff *skb, struct sk_buff *buff, struct sock *sk) { |
7de6c0333 [SKB]: __skb_appe... |
1252 |
__skb_queue_after(&sk->sk_write_queue, skb, buff); |
fe067e8ab [TCP]: Abstract o... |
1253 |
} |
43f59c893 net: Remove __skb... |
1254 |
/* Insert new before skb on the write queue of sk. */ |
fe067e8ab [TCP]: Abstract o... |
1255 1256 1257 1258 |
static inline void tcp_insert_write_queue_before(struct sk_buff *new, struct sk_buff *skb, struct sock *sk) { |
43f59c893 net: Remove __skb... |
1259 |
__skb_queue_before(&sk->sk_write_queue, skb, new); |
6e4214100 [TCP] MTUprobe: f... |
1260 1261 1262 |
if (sk->sk_send_head == skb) sk->sk_send_head = new; |
fe067e8ab [TCP]: Abstract o... |
1263 1264 1265 1266 1267 1268 |
} static inline void tcp_unlink_write_queue(struct sk_buff *skb, struct sock *sk) { __skb_unlink(skb, &sk->sk_write_queue); } |
fe067e8ab [TCP]: Abstract o... |
1269 1270 1271 1272 |
static inline int tcp_write_queue_empty(struct sock *sk) { return skb_queue_empty(&sk->sk_write_queue); } |
12d50c46d tcp: Remove check... |
1273 1274 1275 1276 1277 1278 1279 1280 |
static inline void tcp_push_pending_frames(struct sock *sk) { if (tcp_send_head(sk)) { struct tcp_sock *tp = tcp_sk(sk); __tcp_push_pending_frames(sk, tcp_current_mss(sk), tp->nonagle); } } |
a47e5a988 [TCP]: Convert hi... |
1281 1282 1283 1284 1285 1286 1287 |
/* Start sequence of the highest skb with SACKed bit, valid only if * sacked > 0 or when the caller has ensured validity by itself. */ static inline u32 tcp_highest_sack_seq(struct tcp_sock *tp) { if (!tp->sacked_out) return tp->snd_una; |
6859d4947 [TCP]: Abstract t... |
1288 1289 1290 |
if (tp->highest_sack == NULL) return tp->snd_nxt; |
a47e5a988 [TCP]: Convert hi... |
1291 1292 |
return TCP_SKB_CB(tp->highest_sack)->seq; } |
6859d4947 [TCP]: Abstract t... |
1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 |
static inline void tcp_advance_highest_sack(struct sock *sk, struct sk_buff *skb) { tcp_sk(sk)->highest_sack = tcp_skb_is_last(sk, skb) ? NULL : tcp_write_queue_next(sk, skb); } static inline struct sk_buff *tcp_highest_sack(struct sock *sk) { return tcp_sk(sk)->highest_sack; } static inline void tcp_highest_sack_reset(struct sock *sk) { tcp_sk(sk)->highest_sack = tcp_write_queue_head(sk); } /* Called when old skb is about to be deleted (to be combined with new skb) */ static inline void tcp_highest_sack_combine(struct sock *sk, struct sk_buff *old, struct sk_buff *new) { if (tcp_sk(sk)->sacked_out && (old == tcp_sk(sk)->highest_sack)) tcp_sk(sk)->highest_sack = new; } |
5aa4b32fc net: TCP thin-str... |
1317 1318 1319 1320 1321 1322 1323 |
/* Determines whether this is a thin stream (which may suffer from * increased latency). Used to trigger latency-reducing mechanisms. */ static inline unsigned int tcp_stream_is_thin(struct tcp_sock *tp) { return tp->packets_out < 4 && !tcp_in_initial_slowstart(tp); } |
1da177e4c Linux-2.6.12-rc2 |
1324 1325 1326 1327 1328 1329 1330 |
/* /proc */ enum tcp_seq_states { TCP_SEQ_STATE_LISTENING, TCP_SEQ_STATE_OPENREQ, TCP_SEQ_STATE_ESTABLISHED, TCP_SEQ_STATE_TIME_WAIT, }; |
73cb88ecb net: make the tcp... |
1331 |
int tcp_seq_open(struct inode *inode, struct file *file); |
1da177e4c Linux-2.6.12-rc2 |
1332 |
struct tcp_seq_afinfo { |
73cb88ecb net: make the tcp... |
1333 1334 1335 1336 |
char *name; sa_family_t family; const struct file_operations *seq_fops; struct seq_operations seq_ops; |
1da177e4c Linux-2.6.12-rc2 |
1337 1338 1339 |
}; struct tcp_iter_state { |
a4146b1b2 [TCP]: Replace st... |
1340 |
struct seq_net_private p; |
1da177e4c Linux-2.6.12-rc2 |
1341 1342 1343 |
sa_family_t family; enum tcp_seq_states state; struct sock *syn_wait_sk; |
a8b690f98 tcp: Fix slowness... |
1344 1345 |
int bucket, offset, sbucket, num, uid; loff_t last_pos; |
1da177e4c Linux-2.6.12-rc2 |
1346 |
}; |
6f8b13bcb [NETNS][IPV6] tcp... |
1347 1348 |
extern int tcp_proc_register(struct net *net, struct tcp_seq_afinfo *afinfo); extern void tcp_proc_unregister(struct net *net, struct tcp_seq_afinfo *afinfo); |
1da177e4c Linux-2.6.12-rc2 |
1349 |
|
20380731b [NET]: Fix sparse... |
1350 |
extern struct request_sock_ops tcp_request_sock_ops; |
c6aefafb7 [TCP]: Add IPv6 s... |
1351 |
extern struct request_sock_ops tcp6_request_sock_ops; |
20380731b [NET]: Fix sparse... |
1352 |
|
7d06b2e05 net: change proto... |
1353 |
extern void tcp_v4_destroy_sock(struct sock *sk); |
20380731b [NET]: Fix sparse... |
1354 |
|
a430a43d0 [NET] gso: Fix up... |
1355 |
extern int tcp_v4_gso_send_check(struct sk_buff *skb); |
c8f44affb net: introduce an... |
1356 1357 |
extern struct sk_buff *tcp_tso_segment(struct sk_buff *skb, netdev_features_t features); |
bf296b125 tcp: Add GRO support |
1358 1359 1360 1361 1362 1363 |
extern struct sk_buff **tcp_gro_receive(struct sk_buff **head, struct sk_buff *skb); extern struct sk_buff **tcp4_gro_receive(struct sk_buff **head, struct sk_buff *skb); extern int tcp_gro_complete(struct sk_buff *skb); extern int tcp4_gro_complete(struct sk_buff *skb); |
f4c50d990 [NET]: Add softwa... |
1364 |
|
20380731b [NET]: Fix sparse... |
1365 |
#ifdef CONFIG_PROC_FS |
53d3176b2 net: cleanups |
1366 |
extern int tcp4_proc_init(void); |
20380731b [NET]: Fix sparse... |
1367 1368 |
extern void tcp4_proc_exit(void); #endif |
cfb6eeb4c [TCP]: MD5 Signat... |
1369 1370 1371 1372 1373 1374 1375 |
/* TCP af-specific functions */ struct tcp_sock_af_ops { #ifdef CONFIG_TCP_MD5SIG struct tcp_md5sig_key *(*md5_lookup) (struct sock *sk, struct sock *addr_sk); int (*calc_md5_hash) (char *location, struct tcp_md5sig_key *md5, |
318cf7aaa tcp: md5: add mor... |
1376 1377 1378 |
const struct sock *sk, const struct request_sock *req, const struct sk_buff *skb); |
cfb6eeb4c [TCP]: MD5 Signat... |
1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 |
int (*md5_add) (struct sock *sk, struct sock *addr_sk, u8 *newkey, u8 len); int (*md5_parse) (struct sock *sk, char __user *optval, int optlen); #endif }; struct tcp_request_sock_ops { #ifdef CONFIG_TCP_MD5SIG struct tcp_md5sig_key *(*md5_lookup) (struct sock *sk, struct request_sock *req); |
e3afe7b75 tcp: Fix MD5 sign... |
1393 1394 |
int (*calc_md5_hash) (char *location, struct tcp_md5sig_key *md5, |
318cf7aaa tcp: md5: add mor... |
1395 1396 1397 |
const struct sock *sk, const struct request_sock *req, const struct sk_buff *skb); |
cfb6eeb4c [TCP]: MD5 Signat... |
1398 1399 |
#endif }; |
da5c78c82 TCPCT part 1b: ge... |
1400 1401 1402 1403 1404 1405 1406 |
/* Using SHA1 for now, define some constants. */ #define COOKIE_DIGEST_WORDS (SHA_DIGEST_WORDS) #define COOKIE_MESSAGE_WORDS (SHA_MESSAGE_BYTES / 4) #define COOKIE_WORKSPACE_WORDS (COOKIE_DIGEST_WORDS + COOKIE_MESSAGE_WORDS) extern int tcp_cookie_generator(u32 *bakery); |
435cf559f TCPCT part 1d: de... |
1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 |
/** * struct tcp_cookie_values - each socket needs extra space for the * cookies, together with (optional) space for any SYN data. * * A tcp_sock contains a pointer to the current value, and this is * cloned to the tcp_timewait_sock. * * @cookie_pair: variable data from the option exchange. * * @cookie_desired: user specified tcpct_cookie_desired. Zero * indicates default (sysctl_tcp_cookie_size). * After cookie sent, remembers size of cookie. * Range 0, TCP_COOKIE_MIN to TCP_COOKIE_MAX. * * @s_data_desired: user specified tcpct_s_data_desired. When the * constant payload is specified (@s_data_constant), * holds its length instead. * Range 0 to TCP_MSS_DESIRED. * * @s_data_payload: constant data that is to be included in the * payload of SYN or SYNACK segments when the * cookie option is present. */ struct tcp_cookie_values { struct kref kref; u8 cookie_pair[TCP_COOKIE_PAIR_SIZE]; u8 cookie_pair_size; u8 cookie_desired; u16 s_data_desired:11, s_data_constant:1, s_data_in:1, s_data_out:1, s_data_unused:2; u8 s_data_payload[0]; }; static inline void tcp_cookie_values_release(struct kref *kref) { kfree(container_of(kref, struct tcp_cookie_values, kref)); } /* The length of constant payload data. Note that s_data_desired is * overloaded, depending on s_data_constant: either the length of constant * data (returned here) or the limit on variable data. */ static inline int tcp_s_data_size(const struct tcp_sock *tp) { return (tp->cookie_values != NULL && tp->cookie_values->s_data_constant) ? tp->cookie_values->s_data_desired : 0; } /** * struct tcp_extend_values - tcp_ipv?.c to tcp_output.c workspace. * * As tcp_request_sock has already been extended in other places, the * only remaining method is to pass stack values along as function * parameters. These parameters are not needed after sending SYNACK. * * @cookie_bakery: cryptographic secret and message workspace. * * @cookie_plus: bytes in authenticator/cookie option, copied from * struct tcp_options_received (above). */ struct tcp_extend_values { struct request_values rv; u32 cookie_bakery[COOKIE_WORKSPACE_WORDS]; u8 cookie_plus:6, cookie_out_never:1, cookie_in_always:1; }; static inline struct tcp_extend_values *tcp_xv(struct request_values *rvp) { return (struct tcp_extend_values *)rvp; } |
9b0f976f2 [INET]: Remove st... |
1483 |
extern void tcp_v4_init(void); |
20380731b [NET]: Fix sparse... |
1484 |
extern void tcp_init(void); |
1da177e4c Linux-2.6.12-rc2 |
1485 |
#endif /* _TCP_H */ |