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Diffstat (limited to 'net/ipv4/tcp_input.c')
-rw-r--r--net/ipv4/tcp_input.c59
1 files changed, 38 insertions, 21 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 3f7bd7ae7d7a..dc49a3d551eb 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -500,8 +500,11 @@ static void tcp_grow_window(struct sock *sk, const struct sk_buff *skb,
room = min_t(int, tp->window_clamp, tcp_space(sk)) - tp->rcv_ssthresh;
+ if (room <= 0)
+ return;
+
/* Check #1 */
- if (room > 0 && !tcp_under_memory_pressure(sk)) {
+ if (!tcp_under_memory_pressure(sk)) {
unsigned int truesize = truesize_adjust(adjust, skb);
int incr;
@@ -518,6 +521,11 @@ static void tcp_grow_window(struct sock *sk, const struct sk_buff *skb,
tp->rcv_ssthresh += min(room, incr);
inet_csk(sk)->icsk_ack.quick |= 1;
}
+ } else {
+ /* Under pressure:
+ * Adjust rcv_ssthresh according to reserved mem
+ */
+ tcp_adjust_rcv_ssthresh(sk);
}
}
@@ -1346,7 +1354,7 @@ static u8 tcp_sacktag_one(struct sock *sk,
if (dup_sack && (sacked & TCPCB_RETRANS)) {
if (tp->undo_marker && tp->undo_retrans > 0 &&
after(end_seq, tp->undo_marker))
- tp->undo_retrans--;
+ tp->undo_retrans = max_t(int, 0, tp->undo_retrans - pcount);
if ((sacked & TCPCB_SACKED_ACKED) &&
before(start_seq, state->reord))
state->reord = start_seq;
@@ -3221,7 +3229,6 @@ static int tcp_clean_rtx_queue(struct sock *sk, const struct sk_buff *ack_skb,
long seq_rtt_us = -1L;
long ca_rtt_us = -1L;
u32 pkts_acked = 0;
- u32 last_in_flight = 0;
bool rtt_update;
int flag = 0;
@@ -3257,7 +3264,6 @@ static int tcp_clean_rtx_queue(struct sock *sk, const struct sk_buff *ack_skb,
if (!first_ackt)
first_ackt = last_ackt;
- last_in_flight = TCP_SKB_CB(skb)->tx.in_flight;
if (before(start_seq, reord))
reord = start_seq;
if (!after(scb->end_seq, tp->high_seq))
@@ -3323,8 +3329,8 @@ static int tcp_clean_rtx_queue(struct sock *sk, const struct sk_buff *ack_skb,
seq_rtt_us = tcp_stamp_us_delta(tp->tcp_mstamp, first_ackt);
ca_rtt_us = tcp_stamp_us_delta(tp->tcp_mstamp, last_ackt);
- if (pkts_acked == 1 && last_in_flight < tp->mss_cache &&
- last_in_flight && !prior_sacked && fully_acked &&
+ if (pkts_acked == 1 && fully_acked && !prior_sacked &&
+ (tp->snd_una - prior_snd_una) < tp->mss_cache &&
sack->rate->prior_delivered + 1 == tp->delivered &&
!(flag & (FLAG_CA_ALERT | FLAG_SYN_ACKED))) {
/* Conservatively mark a delayed ACK. It's typically
@@ -3381,9 +3387,10 @@ static int tcp_clean_rtx_queue(struct sock *sk, const struct sk_buff *ack_skb,
if (icsk->icsk_ca_ops->pkts_acked) {
struct ack_sample sample = { .pkts_acked = pkts_acked,
- .rtt_us = sack->rate->rtt_us,
- .in_flight = last_in_flight };
+ .rtt_us = sack->rate->rtt_us };
+ sample.in_flight = tp->mss_cache *
+ (tp->delivered - sack->rate->prior_delivered);
icsk->icsk_ca_ops->pkts_acked(sk, &sample);
}
@@ -3594,7 +3601,7 @@ bool tcp_oow_rate_limited(struct net *net, const struct sk_buff *skb,
}
/* RFC 5961 7 [ACK Throttling] */
-static void tcp_send_challenge_ack(struct sock *sk, const struct sk_buff *skb)
+static void tcp_send_challenge_ack(struct sock *sk)
{
/* unprotected vars, we dont care of overwrites */
static u32 challenge_timestamp;
@@ -3756,7 +3763,7 @@ static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag)
/* RFC 5961 5.2 [Blind Data Injection Attack].[Mitigation] */
if (before(ack, prior_snd_una - tp->max_window)) {
if (!(flag & FLAG_NO_CHALLENGE_ACK))
- tcp_send_challenge_ack(sk, skb);
+ tcp_send_challenge_ack(sk);
return -1;
}
goto old_ack;
@@ -5346,7 +5353,7 @@ static int tcp_prune_queue(struct sock *sk)
if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf)
tcp_clamp_window(sk);
else if (tcp_under_memory_pressure(sk))
- tp->rcv_ssthresh = min(tp->rcv_ssthresh, 4U * tp->advmss);
+ tcp_adjust_rcv_ssthresh(sk);
if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
return 0;
@@ -5381,7 +5388,7 @@ static int tcp_prune_queue(struct sock *sk)
return -1;
}
-static bool tcp_should_expand_sndbuf(const struct sock *sk)
+static bool tcp_should_expand_sndbuf(struct sock *sk)
{
const struct tcp_sock *tp = tcp_sk(sk);
@@ -5392,8 +5399,18 @@ static bool tcp_should_expand_sndbuf(const struct sock *sk)
return false;
/* If we are under global TCP memory pressure, do not expand. */
- if (tcp_under_memory_pressure(sk))
+ if (tcp_under_memory_pressure(sk)) {
+ int unused_mem = sk_unused_reserved_mem(sk);
+
+ /* Adjust sndbuf according to reserved mem. But make sure
+ * it never goes below SOCK_MIN_SNDBUF.
+ * See sk_stream_moderate_sndbuf() for more details.
+ */
+ if (unused_mem > SOCK_MIN_SNDBUF)
+ WRITE_ONCE(sk->sk_sndbuf, unused_mem);
+
return false;
+ }
/* If we are under soft global TCP memory pressure, do not expand. */
if (sk_memory_allocated(sk) >= sk_prot_mem_limits(sk, 0))
@@ -5574,7 +5591,7 @@ static void tcp_check_urg(struct sock *sk, const struct tcphdr *th)
}
}
- tp->urg_data = TCP_URG_NOTYET;
+ WRITE_ONCE(tp->urg_data, TCP_URG_NOTYET);
WRITE_ONCE(tp->urg_seq, ptr);
/* Disable header prediction. */
@@ -5587,11 +5604,11 @@ static void tcp_urg(struct sock *sk, struct sk_buff *skb, const struct tcphdr *t
struct tcp_sock *tp = tcp_sk(sk);
/* Check if we get a new urgent pointer - normally not. */
- if (th->urg)
+ if (unlikely(th->urg))
tcp_check_urg(sk, th);
/* Do we wait for any urgent data? - normally not... */
- if (tp->urg_data == TCP_URG_NOTYET) {
+ if (unlikely(tp->urg_data == TCP_URG_NOTYET)) {
u32 ptr = tp->urg_seq - ntohl(th->seq) + (th->doff * 4) -
th->syn;
@@ -5600,7 +5617,7 @@ static void tcp_urg(struct sock *sk, struct sk_buff *skb, const struct tcphdr *t
u8 tmp;
if (skb_copy_bits(skb, ptr, &tmp, 1))
BUG();
- tp->urg_data = TCP_URG_VALID | tmp;
+ WRITE_ONCE(tp->urg_data, TCP_URG_VALID | tmp);
if (!sock_flag(sk, SOCK_DEAD))
sk->sk_data_ready(sk);
}
@@ -5709,7 +5726,7 @@ static bool tcp_validate_incoming(struct sock *sk, struct sk_buff *skb,
if (tp->syn_fastopen && !tp->data_segs_in &&
sk->sk_state == TCP_ESTABLISHED)
tcp_fastopen_active_disable(sk);
- tcp_send_challenge_ack(sk, skb);
+ tcp_send_challenge_ack(sk);
}
goto discard;
}
@@ -5724,7 +5741,7 @@ syn_challenge:
if (syn_inerr)
TCP_INC_STATS(sock_net(sk), TCP_MIB_INERRS);
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPSYNCHALLENGE);
- tcp_send_challenge_ack(sk, skb);
+ tcp_send_challenge_ack(sk);
goto discard;
}
@@ -5770,7 +5787,7 @@ void tcp_rcv_established(struct sock *sk, struct sk_buff *skb)
trace_tcp_probe(sk, skb);
tcp_mstamp_refresh(tp);
- if (unlikely(!sk->sk_rx_dst))
+ if (unlikely(!rcu_access_pointer(sk->sk_rx_dst)))
inet_csk(sk)->icsk_af_ops->sk_rx_dst_set(sk, skb);
/*
* Header prediction.
@@ -6439,7 +6456,7 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb)
if (!acceptable) {
if (sk->sk_state == TCP_SYN_RECV)
return 1; /* send one RST */
- tcp_send_challenge_ack(sk, skb);
+ tcp_send_challenge_ack(sk);
goto discard;
}
switch (sk->sk_state) {
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