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path: root/net/ipv4/tcp_ipv4.c
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Diffstat (limited to 'net/ipv4/tcp_ipv4.c')
-rw-r--r--net/ipv4/tcp_ipv4.c103
1 files changed, 37 insertions, 66 deletions
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 020766292bb0..02f583b3744a 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -415,6 +415,9 @@ void tcp_v4_err(struct sk_buff *icmp_skb, u32 info)
!icsk->icsk_backoff)
break;
+ if (sock_owned_by_user(sk))
+ break;
+
icsk->icsk_backoff--;
inet_csk(sk)->icsk_rto = __tcp_set_rto(tp) <<
icsk->icsk_backoff;
@@ -429,11 +432,6 @@ void tcp_v4_err(struct sk_buff *icmp_skb, u32 info)
if (remaining) {
inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
remaining, TCP_RTO_MAX);
- } else if (sock_owned_by_user(sk)) {
- /* RTO revert clocked out retransmission,
- * but socket is locked. Will defer. */
- inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
- HZ/20, TCP_RTO_MAX);
} else {
/* RTO revert clocked out retransmission.
* Will retransmit now */
@@ -1212,12 +1210,6 @@ static const struct tcp_request_sock_ops tcp_request_sock_ipv4_ops = {
};
#endif
-static struct timewait_sock_ops tcp_timewait_sock_ops = {
- .twsk_obj_size = sizeof(struct tcp_timewait_sock),
- .twsk_unique = tcp_twsk_unique,
- .twsk_destructor= tcp_twsk_destructor,
-};
-
int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
{
struct tcp_extend_values tmp_ext;
@@ -1349,7 +1341,7 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
tcp_death_row.sysctl_tw_recycle &&
(dst = inet_csk_route_req(sk, req)) != NULL &&
(peer = rt_get_peer((struct rtable *)dst)) != NULL &&
- peer->v4daddr == saddr) {
+ peer->daddr.a4 == saddr) {
inet_peer_refcheck(peer);
if ((u32)get_seconds() - peer->tcp_ts_stamp < TCP_PAWS_MSL &&
(s32)(peer->tcp_ts - req->ts_recent) >
@@ -1422,7 +1414,7 @@ struct sock *tcp_v4_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
newsk = tcp_create_openreq_child(sk, req, skb);
if (!newsk)
- goto exit;
+ goto exit_nonewsk;
newsk->sk_gso_type = SKB_GSO_TCPV4;
sk_setup_caps(newsk, dst);
@@ -1444,7 +1436,7 @@ struct sock *tcp_v4_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
tcp_mtup_init(newsk);
tcp_sync_mss(newsk, dst_mtu(dst));
- newtp->advmss = dst_metric(dst, RTAX_ADVMSS);
+ newtp->advmss = dst_metric_advmss(dst);
if (tcp_sk(sk)->rx_opt.user_mss &&
tcp_sk(sk)->rx_opt.user_mss < newtp->advmss)
newtp->advmss = tcp_sk(sk)->rx_opt.user_mss;
@@ -1469,16 +1461,20 @@ struct sock *tcp_v4_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
}
#endif
+ if (__inet_inherit_port(sk, newsk) < 0) {
+ sock_put(newsk);
+ goto exit;
+ }
__inet_hash_nolisten(newsk, NULL);
- __inet_inherit_port(sk, newsk);
return newsk;
exit_overflow:
NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
+exit_nonewsk:
+ dst_release(dst);
exit:
NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
- dst_release(dst);
return NULL;
}
EXPORT_SYMBOL(tcp_v4_syn_recv_sock);
@@ -1761,64 +1757,40 @@ do_time_wait:
goto discard_it;
}
-/* VJ's idea. Save last timestamp seen from this destination
- * and hold it at least for normal timewait interval to use for duplicate
- * segment detection in subsequent connections, before they enter synchronized
- * state.
- */
-
-int tcp_v4_remember_stamp(struct sock *sk)
+struct inet_peer *tcp_v4_get_peer(struct sock *sk, bool *release_it)
{
+ struct rtable *rt = (struct rtable *) __sk_dst_get(sk);
struct inet_sock *inet = inet_sk(sk);
- struct tcp_sock *tp = tcp_sk(sk);
- struct rtable *rt = (struct rtable *)__sk_dst_get(sk);
- struct inet_peer *peer = NULL;
- int release_it = 0;
+ struct inet_peer *peer;
if (!rt || rt->rt_dst != inet->inet_daddr) {
- peer = inet_getpeer(inet->inet_daddr, 1);
- release_it = 1;
+ peer = inet_getpeer_v4(inet->inet_daddr, 1);
+ *release_it = true;
} else {
if (!rt->peer)
rt_bind_peer(rt, 1);
peer = rt->peer;
+ *release_it = false;
}
- if (peer) {
- if ((s32)(peer->tcp_ts - tp->rx_opt.ts_recent) <= 0 ||
- ((u32)get_seconds() - peer->tcp_ts_stamp > TCP_PAWS_MSL &&
- peer->tcp_ts_stamp <= (u32)tp->rx_opt.ts_recent_stamp)) {
- peer->tcp_ts_stamp = (u32)tp->rx_opt.ts_recent_stamp;
- peer->tcp_ts = tp->rx_opt.ts_recent;
- }
- if (release_it)
- inet_putpeer(peer);
- return 1;
- }
-
- return 0;
+ return peer;
}
-EXPORT_SYMBOL(tcp_v4_remember_stamp);
+EXPORT_SYMBOL(tcp_v4_get_peer);
-int tcp_v4_tw_remember_stamp(struct inet_timewait_sock *tw)
+void *tcp_v4_tw_get_peer(struct sock *sk)
{
- struct inet_peer *peer = inet_getpeer(tw->tw_daddr, 1);
-
- if (peer) {
- const struct tcp_timewait_sock *tcptw = tcp_twsk((struct sock *)tw);
-
- if ((s32)(peer->tcp_ts - tcptw->tw_ts_recent) <= 0 ||
- ((u32)get_seconds() - peer->tcp_ts_stamp > TCP_PAWS_MSL &&
- peer->tcp_ts_stamp <= (u32)tcptw->tw_ts_recent_stamp)) {
- peer->tcp_ts_stamp = (u32)tcptw->tw_ts_recent_stamp;
- peer->tcp_ts = tcptw->tw_ts_recent;
- }
- inet_putpeer(peer);
- return 1;
- }
+ struct inet_timewait_sock *tw = inet_twsk(sk);
- return 0;
+ return inet_getpeer_v4(tw->tw_daddr, 1);
}
+EXPORT_SYMBOL(tcp_v4_tw_get_peer);
+
+static struct timewait_sock_ops tcp_timewait_sock_ops = {
+ .twsk_obj_size = sizeof(struct tcp_timewait_sock),
+ .twsk_unique = tcp_twsk_unique,
+ .twsk_destructor= tcp_twsk_destructor,
+ .twsk_getpeer = tcp_v4_tw_get_peer,
+};
const struct inet_connection_sock_af_ops ipv4_specific = {
.queue_xmit = ip_queue_xmit,
@@ -1826,7 +1798,7 @@ const struct inet_connection_sock_af_ops ipv4_specific = {
.rebuild_header = inet_sk_rebuild_header,
.conn_request = tcp_v4_conn_request,
.syn_recv_sock = tcp_v4_syn_recv_sock,
- .remember_stamp = tcp_v4_remember_stamp,
+ .get_peer = tcp_v4_get_peer,
.net_header_len = sizeof(struct iphdr),
.setsockopt = ip_setsockopt,
.getsockopt = ip_getsockopt,
@@ -2022,13 +1994,12 @@ static void *listening_get_next(struct seq_file *seq, void *cur)
}
req = req->dl_next;
}
- st->offset = 0;
if (++st->sbucket >= icsk->icsk_accept_queue.listen_opt->nr_table_entries)
break;
get_req:
req = icsk->icsk_accept_queue.listen_opt->syn_table[st->sbucket];
}
- sk = sk_next(st->syn_wait_sk);
+ sk = sk_nulls_next(st->syn_wait_sk);
st->state = TCP_SEQ_STATE_LISTENING;
read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
} else {
@@ -2037,11 +2008,13 @@ get_req:
if (reqsk_queue_len(&icsk->icsk_accept_queue))
goto start_req;
read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
- sk = sk_next(sk);
+ sk = sk_nulls_next(sk);
}
get_sk:
sk_nulls_for_each_from(sk, node) {
- if (sk->sk_family == st->family && net_eq(sock_net(sk), net)) {
+ if (!net_eq(sock_net(sk), net))
+ continue;
+ if (sk->sk_family == st->family) {
cur = sk;
goto out;
}
@@ -2571,7 +2544,6 @@ struct sk_buff **tcp4_gro_receive(struct sk_buff **head, struct sk_buff *skb)
return tcp_gro_receive(head, skb);
}
-EXPORT_SYMBOL(tcp4_gro_receive);
int tcp4_gro_complete(struct sk_buff *skb)
{
@@ -2584,7 +2556,6 @@ int tcp4_gro_complete(struct sk_buff *skb)
return tcp_gro_complete(skb);
}
-EXPORT_SYMBOL(tcp4_gro_complete);
struct proto tcp_prot = {
.name = "TCP",
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