diff options
-rw-r--r-- | include/net/request_sock.h | 12 | ||||
-rw-r--r-- | net/dccp/minisocks.c | 3 | ||||
-rw-r--r-- | net/ipv4/inet_connection_sock.c | 25 | ||||
-rw-r--r-- | net/ipv4/inet_diag.c | 2 | ||||
-rw-r--r-- | net/ipv4/syncookies.c | 2 | ||||
-rw-r--r-- | net/ipv4/tcp_input.c | 2 | ||||
-rw-r--r-- | net/ipv4/tcp_ipv4.c | 16 | ||||
-rw-r--r-- | net/ipv4/tcp_minisocks.c | 8 | ||||
-rw-r--r-- | net/ipv4/tcp_timer.c | 8 | ||||
-rw-r--r-- | net/ipv6/syncookies.c | 2 | ||||
-rw-r--r-- | net/ipv6/tcp_ipv6.c | 11 |
11 files changed, 56 insertions, 35 deletions
diff --git a/include/net/request_sock.h b/include/net/request_sock.h index b01d8dd9ee7..a51dbd17c2d 100644 --- a/include/net/request_sock.h +++ b/include/net/request_sock.h @@ -49,13 +49,16 @@ struct request_sock_ops { struct request_sock *req); }; +extern int inet_rtx_syn_ack(struct sock *parent, struct request_sock *req); + /* struct request_sock - mini sock to represent a connection request */ struct request_sock { struct request_sock *dl_next; /* Must be first member! */ u16 mss; - u8 retrans; - u8 cookie_ts; /* syncookie: encode tcpopts in timestamp */ + u8 num_retrans; /* number of retransmits */ + u8 cookie_ts:1; /* syncookie: encode tcpopts in timestamp */ + u8 num_timeout:7; /* number of timeouts */ /* The following two fields can be easily recomputed I think -AK */ u32 window_clamp; /* window clamp at creation time */ u32 rcv_wnd; /* rcv_wnd offered first time */ @@ -231,7 +234,7 @@ static inline int reqsk_queue_removed(struct request_sock_queue *queue, { struct listen_sock *lopt = queue->listen_opt; - if (req->retrans == 0) + if (req->num_timeout == 0) --lopt->qlen_young; return --lopt->qlen; @@ -269,7 +272,8 @@ static inline void reqsk_queue_hash_req(struct request_sock_queue *queue, struct listen_sock *lopt = queue->listen_opt; req->expires = jiffies + timeout; - req->retrans = 0; + req->num_retrans = 0; + req->num_timeout = 0; req->sk = NULL; req->dl_next = lopt->syn_table[hash]; diff --git a/net/dccp/minisocks.c b/net/dccp/minisocks.c index ea850ce35d4..662071b249c 100644 --- a/net/dccp/minisocks.c +++ b/net/dccp/minisocks.c @@ -174,8 +174,7 @@ struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb, * To protect against Request floods, increment retrans * counter (backoff, monitored by dccp_response_timer). */ - req->retrans++; - req->rsk_ops->rtx_syn_ack(sk, req, NULL); + inet_rtx_syn_ack(sk, req); } /* Network Duplicate, discard packet */ return NULL; diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c index d34ce2972c8..2026542d683 100644 --- a/net/ipv4/inet_connection_sock.c +++ b/net/ipv4/inet_connection_sock.c @@ -521,21 +521,31 @@ static inline void syn_ack_recalc(struct request_sock *req, const int thresh, int *expire, int *resend) { if (!rskq_defer_accept) { - *expire = req->retrans >= thresh; + *expire = req->num_timeout >= thresh; *resend = 1; return; } - *expire = req->retrans >= thresh && - (!inet_rsk(req)->acked || req->retrans >= max_retries); + *expire = req->num_timeout >= thresh && + (!inet_rsk(req)->acked || req->num_timeout >= max_retries); /* * Do not resend while waiting for data after ACK, * start to resend on end of deferring period to give * last chance for data or ACK to create established socket. */ *resend = !inet_rsk(req)->acked || - req->retrans >= rskq_defer_accept - 1; + req->num_timeout >= rskq_defer_accept - 1; } +int inet_rtx_syn_ack(struct sock *parent, struct request_sock *req) +{ + int err = req->rsk_ops->rtx_syn_ack(parent, req, NULL); + + if (!err) + req->num_retrans++; + return err; +} +EXPORT_SYMBOL(inet_rtx_syn_ack); + void inet_csk_reqsk_queue_prune(struct sock *parent, const unsigned long interval, const unsigned long timeout, @@ -599,13 +609,14 @@ void inet_csk_reqsk_queue_prune(struct sock *parent, req->rsk_ops->syn_ack_timeout(parent, req); if (!expire && (!resend || - !req->rsk_ops->rtx_syn_ack(parent, req, NULL) || + !inet_rtx_syn_ack(parent, req) || inet_rsk(req)->acked)) { unsigned long timeo; - if (req->retrans++ == 0) + if (req->num_timeout++ == 0) lopt->qlen_young--; - timeo = min((timeout << req->retrans), max_rto); + timeo = min(timeout << req->num_timeout, + max_rto); req->expires = now + timeo; reqp = &req->dl_next; continue; diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c index e5bad82d358..b5e781b529a 100644 --- a/net/ipv4/inet_diag.c +++ b/net/ipv4/inet_diag.c @@ -620,7 +620,7 @@ static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk, r->idiag_family = sk->sk_family; r->idiag_state = TCP_SYN_RECV; r->idiag_timer = 1; - r->idiag_retrans = req->retrans; + r->idiag_retrans = req->num_retrans; r->id.idiag_if = sk->sk_bound_dev_if; sock_diag_save_cookie(req, r->id.idiag_cookie); diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c index ba48e799b03..b236ef04914 100644 --- a/net/ipv4/syncookies.c +++ b/net/ipv4/syncookies.c @@ -340,7 +340,7 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb, } req->expires = 0UL; - req->retrans = 0; + req->num_retrans = 0; /* * We need to lookup the route here to get at the correct diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 60cf836120a..e95b4e508af 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -5991,7 +5991,7 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb, */ if (req) { tcp_synack_rtt_meas(sk, req); - tp->total_retrans = req->retrans; + tp->total_retrans = req->num_retrans; reqsk_fastopen_remove(sk, req, false); } else { diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index 60e2e5d3ce2..e3607669064 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -877,10 +877,13 @@ static int tcp_v4_send_synack(struct sock *sk, struct dst_entry *dst, } static int tcp_v4_rtx_synack(struct sock *sk, struct request_sock *req, - struct request_values *rvp) + struct request_values *rvp) { - TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS); - return tcp_v4_send_synack(sk, NULL, req, rvp, 0, false); + int res = tcp_v4_send_synack(sk, NULL, req, rvp, 0, false); + + if (!res) + TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS); + return res; } /* @@ -1386,7 +1389,8 @@ static int tcp_v4_conn_req_fastopen(struct sock *sk, struct sock *child; int err; - req->retrans = 0; + req->num_retrans = 0; + req->num_timeout = 0; req->sk = NULL; child = inet_csk(sk)->icsk_af_ops->syn_recv_sock(sk, skb, req, NULL); @@ -1740,7 +1744,7 @@ struct sock *tcp_v4_syn_recv_sock(struct sock *sk, struct sk_buff *skb, tcp_initialize_rcv_mss(newsk); tcp_synack_rtt_meas(newsk, req); - newtp->total_retrans = req->retrans; + newtp->total_retrans = req->num_retrans; #ifdef CONFIG_TCP_MD5SIG /* Copy over the MD5 key from the original socket */ @@ -2638,7 +2642,7 @@ static void get_openreq4(const struct sock *sk, const struct request_sock *req, 0, 0, /* could print option size, but that is af dependent. */ 1, /* timers active (only the expire timer) */ jiffies_delta_to_clock_t(delta), - req->retrans, + req->num_timeout, from_kuid_munged(seq_user_ns(f), uid), 0, /* non standard timer */ 0, /* open_requests have no inode */ diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c index 27536ba16c9..0404b3f4c95 100644 --- a/net/ipv4/tcp_minisocks.c +++ b/net/ipv4/tcp_minisocks.c @@ -552,7 +552,7 @@ struct sock *tcp_check_req(struct sock *sk, struct sk_buff *skb, * it can be estimated (approximately) * from another data. */ - tmp_opt.ts_recent_stamp = get_seconds() - ((TCP_TIMEOUT_INIT/HZ)<<req->retrans); + tmp_opt.ts_recent_stamp = get_seconds() - ((TCP_TIMEOUT_INIT/HZ)<<req->num_timeout); paws_reject = tcp_paws_reject(&tmp_opt, th->rst); } } @@ -581,7 +581,7 @@ struct sock *tcp_check_req(struct sock *sk, struct sk_buff *skb, * Note that even if there is new data in the SYN packet * they will be thrown away too. */ - req->rsk_ops->rtx_syn_ack(sk, req, NULL); + inet_rtx_syn_ack(sk, req); return NULL; } @@ -695,7 +695,7 @@ struct sock *tcp_check_req(struct sock *sk, struct sk_buff *skb, /* Got ACK for our SYNACK, so update baseline for SYNACK RTT sample. */ if (tmp_opt.saw_tstamp && tmp_opt.rcv_tsecr) tcp_rsk(req)->snt_synack = tmp_opt.rcv_tsecr; - else if (req->retrans) /* don't take RTT sample if retrans && ~TS */ + else if (req->num_retrans) /* don't take RTT sample if retrans && ~TS */ tcp_rsk(req)->snt_synack = 0; /* For Fast Open no more processing is needed (sk is the @@ -705,7 +705,7 @@ struct sock *tcp_check_req(struct sock *sk, struct sk_buff *skb, return sk; /* While TCP_DEFER_ACCEPT is active, drop bare ACK. */ - if (req->retrans < inet_csk(sk)->icsk_accept_queue.rskq_defer_accept && + if (req->num_timeout < inet_csk(sk)->icsk_accept_queue.rskq_defer_accept && TCP_SKB_CB(skb)->end_seq == tcp_rsk(req)->rcv_isn + 1) { inet_rsk(req)->acked = 1; NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPDEFERACCEPTDROP); diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c index fc04711e80c..62c69ab19fd 100644 --- a/net/ipv4/tcp_timer.c +++ b/net/ipv4/tcp_timer.c @@ -318,7 +318,7 @@ static void tcp_fastopen_synack_timer(struct sock *sk) req = tcp_sk(sk)->fastopen_rsk; req->rsk_ops->syn_ack_timeout(sk, req); - if (req->retrans >= max_retries) { + if (req->num_timeout >= max_retries) { tcp_write_err(sk); return; } @@ -327,10 +327,10 @@ static void tcp_fastopen_synack_timer(struct sock *sk) * regular retransmit because if the child socket has been accepted * it's not good to give up too easily. */ - req->rsk_ops->rtx_syn_ack(sk, req, NULL); - req->retrans++; + inet_rtx_syn_ack(sk, req); + req->num_timeout++; inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, - TCP_TIMEOUT_INIT << req->retrans, TCP_RTO_MAX); + TCP_TIMEOUT_INIT << req->num_timeout, TCP_RTO_MAX); } /* diff --git a/net/ipv6/syncookies.c b/net/ipv6/syncookies.c index 182ab9a85d6..40161977f7c 100644 --- a/net/ipv6/syncookies.c +++ b/net/ipv6/syncookies.c @@ -214,7 +214,7 @@ struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb) ireq6->iif = inet6_iif(skb); req->expires = 0UL; - req->retrans = 0; + req->num_retrans = 0; ireq->ecn_ok = ecn_ok; ireq->snd_wscale = tcp_opt.snd_wscale; ireq->sack_ok = tcp_opt.sack_ok; diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index bb6782e8499..c73d0ebde9c 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -495,9 +495,12 @@ static int tcp_v6_rtx_synack(struct sock *sk, struct request_sock *req, struct request_values *rvp) { struct flowi6 fl6; + int res; - TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS); - return tcp_v6_send_synack(sk, NULL, &fl6, req, rvp, 0); + res = tcp_v6_send_synack(sk, NULL, &fl6, req, rvp, 0); + if (!res) + TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS); + return res; } static void tcp_v6_reqsk_destructor(struct request_sock *req) @@ -1364,7 +1367,7 @@ static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, tcp_initialize_rcv_mss(newsk); tcp_synack_rtt_meas(newsk, req); - newtp->total_retrans = req->retrans; + newtp->total_retrans = req->num_retrans; newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; newinet->inet_rcv_saddr = LOOPBACK4_IPV6; @@ -1866,7 +1869,7 @@ static void get_openreq6(struct seq_file *seq, 0,0, /* could print option size, but that is af dependent. */ 1, /* timers active (only the expire timer) */ jiffies_to_clock_t(ttd), - req->retrans, + req->num_timeout, from_kuid_munged(seq_user_ns(seq), uid), 0, /* non standard timer */ 0, /* open_requests have no inode */ |