#include <linux/slab.h>
#include <linux/cache.h>
#include <linux/percpu.h>
+#include <linux/skbuff.h>
#include <net/inet_connection_sock.h>
#include <net/inet_timewait_sock.h>
*/
#define TCP_SYN_RETRIES 5 /* number of times to retry active opening a
- * connection: ~180sec is RFC minumum */
+ * connection: ~180sec is RFC minimum */
#define TCP_SYNACK_RETRIES 5 /* number of times to retry passive opening a
- * connection: ~180sec is RFC minumum */
+ * connection: ~180sec is RFC minimum */
#define TCP_ORPHAN_RETRIES 7 /* number of times to retry on an orphaned
/* 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 overriden for already queued data */
+#define TCP_NAGLE_PUSH 4 /* Cork is overridden for already queued data */
extern struct inet_timewait_death_row tcp_death_row;
extern int sysctl_tcp_nometrics_save;
extern int sysctl_tcp_moderate_rcvbuf;
extern int sysctl_tcp_tso_win_divisor;
+extern int sysctl_tcp_abc;
extern atomic_t tcp_memory_allocated;
extern atomic_t tcp_sockets_allocated;
extern int tcp_memory_pressure;
-/*
- * Pointers to address related TCP functions
- * (i.e. things that depend on the address family)
- */
-
-struct tcp_func {
- int (*queue_xmit) (struct sk_buff *skb,
- int ipfragok);
-
- void (*send_check) (struct sock *sk,
- struct tcphdr *th,
- int len,
- struct sk_buff *skb);
-
- int (*rebuild_header) (struct sock *sk);
-
- int (*conn_request) (struct sock *sk,
- struct sk_buff *skb);
-
- struct sock * (*syn_recv_sock) (struct sock *sk,
- struct sk_buff *skb,
- struct request_sock *req,
- struct dst_entry *dst);
-
- int (*remember_stamp) (struct sock *sk);
-
- __u16 net_header_len;
-
- int (*setsockopt) (struct sock *sk,
- int level,
- int optname,
- char __user *optval,
- int optlen);
-
- int (*getsockopt) (struct sock *sk,
- int level,
- int optname,
- char __user *optval,
- int __user *optlen);
-
-
- void (*addr2sockaddr) (struct sock *sk,
- struct sockaddr *);
-
- int sockaddr_len;
-};
-
/*
* The next routines deal with comparing 32 bit unsigned ints
* and worry about wraparound (automatic with unsigned arithmetic).
extern void tcp_rcv_space_adjust(struct sock *sk);
+extern int tcp_twsk_unique(struct sock *sk,
+ struct sock *sktw, void *twp);
+
static inline void tcp_dec_quickack_mode(struct sock *sk,
const unsigned int pkts)
{
* TCP v4 functions exported for the inet6 API
*/
-extern void tcp_v4_send_check(struct sock *sk,
- struct tcphdr *th, int len,
+extern void tcp_v4_send_check(struct sock *sk, int len,
struct sk_buff *skb);
extern int tcp_v4_conn_request(struct sock *sk,
extern int tcp_read_sock(struct sock *sk, read_descriptor_t *desc,
sk_read_actor_t recv_actor);
-/* Initialize RCV_MSS value.
- * RCV_MSS is an our guess about MSS used by the peer.
- * We haven't any direct information about the MSS.
- * It's better to underestimate the RCV_MSS rather than overestimate.
- * Overestimations make us ACKing less frequently than needed.
- * Underestimations are more easy to detect and fix by tcp_measure_rcv_mss().
- */
-
-static inline void tcp_initialize_rcv_mss(struct sock *sk)
-{
- struct tcp_sock *tp = tcp_sk(sk);
- unsigned int hint = min_t(unsigned int, tp->advmss, tp->mss_cache);
-
- hint = min(hint, tp->rcv_wnd/2);
- hint = min(hint, TCP_MIN_RCVMSS);
- hint = max(hint, TCP_MIN_MSS);
+extern void tcp_initialize_rcv_mss(struct sock *sk);
- inet_csk(sk)->icsk_ack.rcv_mss = hint;
-}
-
-static __inline__ void __tcp_fast_path_on(struct tcp_sock *tp, u32 snd_wnd)
+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)
+static inline void tcp_fast_path_on(struct tcp_sock *tp)
{
__tcp_fast_path_on(tp, tp->snd_wnd >> tp->rx_opt.snd_wscale);
}
* 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)
+static inline u32 tcp_receive_window(const struct tcp_sock *tp)
{
s32 win = tp->rcv_wup + tp->rcv_wnd - tp->rcv_nxt;
/* 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 decidely
- * only use of the low 32-bits of jiffies and hide the ugly
+ * 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))
-/* This is what the send packet queueing engine uses to pass
+/* 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 36 bytes on 32-bit architectures,
#define TCPCB_EVER_RETRANS 0x80 /* Ever retransmitted frame */
#define TCPCB_RETRANS (TCPCB_SACKED_RETRANS|TCPCB_EVER_RETRANS)
-#define TCPCB_URG 0x20 /* Urgent pointer advenced here */
+#define TCPCB_URG 0x20 /* Urgent pointer advanced here */
#define TCPCB_AT_TAIL (TCPCB_URG)
extern int tcp_set_default_congestion_control(const char *name);
extern void tcp_get_default_congestion_control(char *name);
extern int tcp_set_congestion_control(struct sock *sk, const char *name);
+extern void tcp_slow_start(struct tcp_sock *tp);
extern struct tcp_congestion_ops tcp_init_congestion_ops;
extern u32 tcp_reno_ssthresh(struct sock *sk);
* "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)
+static inline unsigned int tcp_packets_in_flight(const struct tcp_sock *tp)
{
return (tp->packets_out - tp->left_out + tp->retrans_out);
}
tp->left_out = tp->sacked_out + tp->lost_out;
}
-/* Set slow start threshold and cwnd not falling to slow start */
-static inline void __tcp_enter_cwr(struct sock *sk)
-{
- const struct inet_connection_sock *icsk = inet_csk(sk);
- struct tcp_sock *tp = tcp_sk(sk);
-
- tp->undo_marker = 0;
- tp->snd_ssthresh = icsk->icsk_ca_ops->ssthresh(sk);
- tp->snd_cwnd = min(tp->snd_cwnd,
- tcp_packets_in_flight(tp) + 1U);
- tp->snd_cwnd_cnt = 0;
- tp->high_seq = tp->snd_nxt;
- tp->snd_cwnd_stamp = tcp_time_stamp;
- TCP_ECN_queue_cwr(tp);
-}
-
-static inline void tcp_enter_cwr(struct sock *sk)
-{
- struct tcp_sock *tp = tcp_sk(sk);
-
- tp->prior_ssthresh = 0;
- if (inet_csk(sk)->icsk_ca_state < TCP_CA_CWR) {
- __tcp_enter_cwr(sk);
- tcp_set_ca_state(sk, TCP_CA_CWR);
- }
-}
-
+extern void tcp_enter_cwr(struct sock *sk);
extern __u32 tcp_init_cwnd(struct tcp_sock *tp, struct dst_entry *dst);
/* Slow start with delack produces 3 packets of burst, so that
return 3;
}
-static __inline__ void tcp_minshall_update(struct tcp_sock *tp, int mss,
- const struct sk_buff *skb)
+/* RFC2861 Check whether we are limited by application or congestion window
+ * This is the inverse of cwnd check in tcp_tso_should_defer
+ */
+static inline int tcp_is_cwnd_limited(const struct sock *sk, u32 in_flight)
+{
+ const struct tcp_sock *tp = tcp_sk(sk);
+ u32 left;
+
+ if (in_flight >= tp->snd_cwnd)
+ return 1;
+
+ if (!(sk->sk_route_caps & NETIF_F_TSO))
+ return 0;
+
+ left = tp->snd_cwnd - in_flight;
+ if (sysctl_tcp_tso_win_divisor)
+ return left * sysctl_tcp_tso_win_divisor < tp->snd_cwnd;
+ else
+ return left <= tcp_max_burst(tp);
+}
+
+static inline void tcp_minshall_update(struct tcp_sock *tp, int mss,
+ const struct sk_buff *skb)
{
if (skb->len < mss)
tp->snd_sml = TCP_SKB_CB(skb)->end_seq;
}
-static __inline__ void tcp_check_probe_timer(struct sock *sk, struct tcp_sock *tp)
+static inline void tcp_check_probe_timer(struct sock *sk, struct tcp_sock *tp)
{
const struct inet_connection_sock *icsk = inet_csk(sk);
if (!tp->packets_out && !icsk->icsk_pending)
icsk->icsk_rto, TCP_RTO_MAX);
}
-static __inline__ void tcp_push_pending_frames(struct sock *sk,
- struct tcp_sock *tp)
+static inline void tcp_push_pending_frames(struct sock *sk,
+ struct tcp_sock *tp)
{
__tcp_push_pending_frames(sk, tp, tcp_current_mss(sk, 1), tp->nonagle);
}
-static __inline__ void tcp_init_wl(struct tcp_sock *tp, u32 ack, u32 seq)
+static inline void tcp_init_wl(struct tcp_sock *tp, u32 ack, u32 seq)
{
tp->snd_wl1 = seq;
}
-static __inline__ void tcp_update_wl(struct tcp_sock *tp, u32 ack, u32 seq)
+static inline void tcp_update_wl(struct tcp_sock *tp, u32 ack, u32 seq)
{
tp->snd_wl1 = seq;
}
/*
* Calculate(/check) TCP checksum
*/
-static __inline__ u16 tcp_v4_check(struct tcphdr *th, int len,
- unsigned long saddr, unsigned long daddr,
- unsigned long base)
+static inline u16 tcp_v4_check(struct tcphdr *th, int len,
+ unsigned long saddr, unsigned long daddr,
+ unsigned long base)
{
return csum_tcpudp_magic(saddr,daddr,len,IPPROTO_TCP,base);
}
-static __inline__ int __tcp_checksum_complete(struct sk_buff *skb)
+static inline int __tcp_checksum_complete(struct sk_buff *skb)
{
- return (unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum));
+ return __skb_checksum_complete(skb);
}
-static __inline__ int tcp_checksum_complete(struct sk_buff *skb)
+static inline int tcp_checksum_complete(struct sk_buff *skb)
{
return skb->ip_summed != CHECKSUM_UNNECESSARY &&
__tcp_checksum_complete(skb);
/* Prequeue for VJ style copy to user, combined with checksumming. */
-static __inline__ void tcp_prequeue_init(struct tcp_sock *tp)
+static inline void tcp_prequeue_init(struct tcp_sock *tp)
{
tp->ucopy.task = NULL;
tp->ucopy.len = 0;
*
* NOTE: is this not too big to inline?
*/
-static __inline__ int tcp_prequeue(struct sock *sk, struct sk_buff *skb)
+static inline int tcp_prequeue(struct sock *sk, struct sk_buff *skb)
{
struct tcp_sock *tp = tcp_sk(sk);
};
#endif
-static __inline__ void tcp_set_state(struct sock *sk, int state)
+static inline void tcp_set_state(struct sock *sk, int state)
{
int oldstate = sk->sk_state;
#endif
}
-static __inline__ void tcp_done(struct sock *sk)
+static inline void tcp_done(struct sock *sk)
{
tcp_set_state(sk, TCP_CLOSE);
tcp_clear_xmit_timers(sk);
inet_csk_destroy_sock(sk);
}
-static __inline__ void tcp_sack_reset(struct tcp_options_received *rx_opt)
+static inline void tcp_sack_reset(struct tcp_options_received *rx_opt)
{
rx_opt->dsack = 0;
rx_opt->eff_sacks = 0;
rx_opt->num_sacks = 0;
}
-static __inline__ void tcp_build_and_update_options(__u32 *ptr, struct tcp_sock *tp, __u32 tstamp)
-{
- if (tp->rx_opt.tstamp_ok) {
- *ptr++ = __constant_htonl((TCPOPT_NOP << 24) |
- (TCPOPT_NOP << 16) |
- (TCPOPT_TIMESTAMP << 8) |
- TCPOLEN_TIMESTAMP);
- *ptr++ = htonl(tstamp);
- *ptr++ = htonl(tp->rx_opt.ts_recent);
- }
- if (tp->rx_opt.eff_sacks) {
- struct tcp_sack_block *sp = tp->rx_opt.dsack ? tp->duplicate_sack : tp->selective_acks;
- int this_sack;
-
- *ptr++ = __constant_htonl((TCPOPT_NOP << 24) |
- (TCPOPT_NOP << 16) |
- (TCPOPT_SACK << 8) |
- (TCPOLEN_SACK_BASE +
- (tp->rx_opt.eff_sacks * TCPOLEN_SACK_PERBLOCK)));
- for(this_sack = 0; this_sack < tp->rx_opt.eff_sacks; this_sack++) {
- *ptr++ = htonl(sp[this_sack].start_seq);
- *ptr++ = htonl(sp[this_sack].end_seq);
- }
- if (tp->rx_opt.dsack) {
- tp->rx_opt.dsack = 0;
- tp->rx_opt.eff_sacks--;
- }
- }
-}
-
-/* Construct a tcp options header for a SYN or SYN_ACK packet.
- * If this is every changed make sure to change the definition of
- * MAX_SYN_SIZE to match the new maximum number of options that you
- * can generate.
- */
-static inline void tcp_syn_build_options(__u32 *ptr, int mss, int ts, int sack,
- int offer_wscale, int wscale, __u32 tstamp, __u32 ts_recent)
-{
- /* We always get an MSS option.
- * The option bytes which will be seen in normal data
- * packets should timestamps be used, must be in the MSS
- * advertised. But we subtract them from tp->mss_cache so
- * that calculations in tcp_sendmsg are simpler etc.
- * So account for this fact here if necessary. If we
- * don't do this correctly, as a receiver we won't
- * recognize data packets as being full sized when we
- * should, and thus we won't abide by the delayed ACK
- * rules correctly.
- * SACKs don't matter, we never delay an ACK when we
- * have any of those going out.
- */
- *ptr++ = htonl((TCPOPT_MSS << 24) | (TCPOLEN_MSS << 16) | mss);
- if (ts) {
- if(sack)
- *ptr++ = __constant_htonl((TCPOPT_SACK_PERM << 24) | (TCPOLEN_SACK_PERM << 16) |
- (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP);
- else
- *ptr++ = __constant_htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
- (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP);
- *ptr++ = htonl(tstamp); /* TSVAL */
- *ptr++ = htonl(ts_recent); /* TSECR */
- } else if(sack)
- *ptr++ = __constant_htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
- (TCPOPT_SACK_PERM << 8) | TCPOLEN_SACK_PERM);
- if (offer_wscale)
- *ptr++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_WINDOW << 16) | (TCPOLEN_WINDOW << 8) | (wscale));
-}
-
/* 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,
return tcp_win_from_space(sk->sk_rcvbuf);
}
-static __inline__ void tcp_openreq_init(struct request_sock *req,
- struct tcp_options_received *rx_opt,
- struct sk_buff *skb)
+static inline void tcp_openreq_init(struct request_sock *req,
+ struct tcp_options_received *rx_opt,
+ struct sk_buff *skb)
{
struct inet_request_sock *ireq = inet_rsk(req);
TCP_ADD_STATS_USER(TCP_MIB_MAXCONN, -1);
}
+/*from STCP */
+static inline void clear_all_retrans_hints(struct tcp_sock *tp){
+ tp->lost_skb_hint = NULL;
+ tp->scoreboard_skb_hint = NULL;
+ tp->retransmit_skb_hint = NULL;
+ tp->forward_skb_hint = NULL;
+ tp->fastpath_skb_hint = NULL;
+}
+
/* /proc */
enum tcp_seq_states {
TCP_SEQ_STATE_LISTENING,
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