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Diffstat (limited to 'include/net/tcp.h')
-rw-r--r--include/net/tcp.h110
1 files changed, 78 insertions, 32 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 87d877408188..dafa1cbc149b 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -220,8 +220,6 @@ void tcp_time_wait(struct sock *sk, int state, int timeo);
#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
@@ -230,10 +228,6 @@ void tcp_time_wait(struct sock *sk, int state, int timeo);
*/
#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;
@@ -417,7 +411,7 @@ struct sock *tcp_check_req(struct sock *sk, struct sk_buff *skb,
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_enter_loss(struct sock *sk);
void tcp_clear_retrans(struct tcp_sock *tp);
void tcp_update_metrics(struct sock *sk);
void tcp_init_metrics(struct sock *sk);
@@ -499,14 +493,8 @@ static inline u32 tcp_cookie_time(void)
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;
-}
+__u32 cookie_v4_init_sequence(struct sock *sk, const struct sk_buff *skb,
+ __u16 *mss);
#endif
__u32 cookie_init_timestamp(struct request_sock *req);
@@ -522,13 +510,6 @@ 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 */
@@ -541,7 +522,7 @@ 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);
+int tcp_fragment(struct sock *, struct sk_buff *, u32, unsigned int, gfp_t);
void tcp_send_probe0(struct sock *);
void tcp_send_partial(struct sock *);
@@ -558,7 +539,6 @@ 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);
@@ -797,7 +777,7 @@ struct tcp_congestion_ops {
/* 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);
+ void (*cong_avoid)(struct sock *sk, u32 ack, u32 acked);
/* call before changing ca_state (optional) */
void (*set_state)(struct sock *sk, u8 new_state);
/* call when cwnd event occurs (optional) */
@@ -829,7 +809,7 @@ 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);
+void tcp_reno_cong_avoid(struct sock *sk, u32 ack, u32 acked);
extern struct tcp_congestion_ops tcp_reno;
static inline void tcp_set_ca_state(struct sock *sk, const u8 ca_state)
@@ -948,7 +928,7 @@ static inline __u32 tcp_current_ssthresh(const struct sock *sk)
/* 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)
-void tcp_enter_cwr(struct sock *sk, const int set_ssthresh);
+void tcp_enter_cwr(struct sock *sk);
__u32 tcp_init_cwnd(const struct tcp_sock *tp, const struct dst_entry *dst);
/* The maximum number of MSS of available cwnd for which TSO defers
@@ -975,7 +955,30 @@ static inline u32 tcp_wnd_end(const struct tcp_sock *tp)
{
return tp->snd_una + tp->snd_wnd;
}
-bool tcp_is_cwnd_limited(const struct sock *sk, u32 in_flight);
+
+/* We follow the spirit of RFC2861 to validate cwnd but implement a more
+ * flexible approach. The RFC suggests cwnd should not be raised unless
+ * it was fully used previously. And that's exactly what we do in
+ * congestion avoidance mode. But in slow start we allow cwnd to grow
+ * as long as the application has used half the cwnd.
+ * Example :
+ * cwnd is 10 (IW10), but application sends 9 frames.
+ * We allow cwnd to reach 18 when all frames are ACKed.
+ * This check is safe because it's as aggressive as slow start which already
+ * risks 100% overshoot. The advantage is that we discourage application to
+ * either send more filler packets or data to artificially blow up the cwnd
+ * usage, and allow application-limited process to probe bw more aggressively.
+ */
+static inline bool tcp_is_cwnd_limited(const struct sock *sk)
+{
+ const struct tcp_sock *tp = tcp_sk(sk);
+
+ /* If in slow start, ensure cwnd grows to twice what was ACKed. */
+ if (tp->snd_cwnd <= tp->snd_ssthresh)
+ return tp->snd_cwnd < 2 * tp->max_packets_out;
+
+ return tp->is_cwnd_limited;
+}
static inline void tcp_check_probe_timer(struct sock *sk)
{
@@ -1082,7 +1085,7 @@ static inline int tcp_full_space(const struct sock *sk)
static inline void tcp_openreq_init(struct request_sock *req,
struct tcp_options_received *rx_opt,
- struct sk_buff *skb)
+ struct sk_buff *skb, struct sock *sk)
{
struct inet_request_sock *ireq = inet_rsk(req);
@@ -1090,7 +1093,7 @@ static inline void tcp_openreq_init(struct request_sock *req,
req->cookie_ts = 0;
tcp_rsk(req)->rcv_isn = TCP_SKB_CB(skb)->seq;
tcp_rsk(req)->rcv_nxt = TCP_SKB_CB(skb)->seq + 1;
- tcp_rsk(req)->snt_synack = 0;
+ tcp_rsk(req)->snt_synack = tcp_time_stamp;
req->mss = rx_opt->mss_clamp;
req->ts_recent = rx_opt->saw_tstamp ? rx_opt->rcv_tsval : 0;
ireq->tstamp_ok = rx_opt->tstamp_ok;
@@ -1101,8 +1104,12 @@ static inline void tcp_openreq_init(struct request_sock *req,
ireq->ecn_ok = 0;
ireq->ir_rmt_port = tcp_hdr(skb)->source;
ireq->ir_num = ntohs(tcp_hdr(skb)->dest);
+ ireq->ir_mark = inet_request_mark(sk, skb);
}
+extern void tcp_openreq_init_rwin(struct request_sock *req,
+ struct sock *sk, struct dst_entry *dst);
+
void tcp_enter_memory_pressure(struct sock *sk);
static inline int keepalive_intvl_when(const struct tcp_sock *tp)
@@ -1312,8 +1319,10 @@ void tcp_free_fastopen_req(struct tcp_sock *tp);
extern struct tcp_fastopen_context __rcu *tcp_fastopen_ctx;
int tcp_fastopen_reset_cipher(void *key, unsigned int len);
-void tcp_fastopen_cookie_gen(__be32 src, __be32 dst,
- struct tcp_fastopen_cookie *foc);
+bool tcp_try_fastopen(struct sock *sk, struct sk_buff *skb,
+ struct request_sock *req,
+ struct tcp_fastopen_cookie *foc,
+ struct dst_entry *dst);
void tcp_fastopen_init_key_once(bool publish);
#define TCP_FASTOPEN_KEY_LENGTH 16
@@ -1564,6 +1573,11 @@ int tcp4_proc_init(void);
void tcp4_proc_exit(void);
#endif
+int tcp_rtx_synack(struct sock *sk, struct request_sock *req);
+int tcp_conn_request(struct request_sock_ops *rsk_ops,
+ const struct tcp_request_sock_ops *af_ops,
+ struct sock *sk, struct sk_buff *skb);
+
/* TCP af-specific functions */
struct tcp_sock_af_ops {
#ifdef CONFIG_TCP_MD5SIG
@@ -1581,6 +1595,7 @@ struct tcp_sock_af_ops {
};
struct tcp_request_sock_ops {
+ u16 mss_clamp;
#ifdef CONFIG_TCP_MD5SIG
struct tcp_md5sig_key *(*md5_lookup) (struct sock *sk,
struct request_sock *req);
@@ -1590,8 +1605,39 @@ struct tcp_request_sock_ops {
const struct request_sock *req,
const struct sk_buff *skb);
#endif
+ void (*init_req)(struct request_sock *req, struct sock *sk,
+ struct sk_buff *skb);
+#ifdef CONFIG_SYN_COOKIES
+ __u32 (*cookie_init_seq)(struct sock *sk, const struct sk_buff *skb,
+ __u16 *mss);
+#endif
+ struct dst_entry *(*route_req)(struct sock *sk, struct flowi *fl,
+ const struct request_sock *req,
+ bool *strict);
+ __u32 (*init_seq)(const struct sk_buff *skb);
+ int (*send_synack)(struct sock *sk, struct dst_entry *dst,
+ struct flowi *fl, struct request_sock *req,
+ u16 queue_mapping, struct tcp_fastopen_cookie *foc);
+ void (*queue_hash_add)(struct sock *sk, struct request_sock *req,
+ const unsigned long timeout);
};
+#ifdef CONFIG_SYN_COOKIES
+static inline __u32 cookie_init_sequence(const struct tcp_request_sock_ops *ops,
+ struct sock *sk, struct sk_buff *skb,
+ __u16 *mss)
+{
+ return ops->cookie_init_seq(sk, skb, mss);
+}
+#else
+static inline __u32 cookie_init_sequence(const struct tcp_request_sock_ops *ops,
+ struct sock *sk, struct sk_buff *skb,
+ __u16 *mss)
+{
+ return 0;
+}
+#endif
+
int tcpv4_offload_init(void);
void tcp_v4_init(void);
generated by cgit v1.2.3 (git 2.39.0) at 2025-12-10 21:55:40 +0300