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-rw-r--r--net/ipv4/af_inet.c18
-rw-r--r--net/ipv4/ip_input.c39
-rw-r--r--net/ipv4/tcp_input.c16
-rw-r--r--net/ipv4/tcp_ipv4.c46
-rw-r--r--net/ipv4/tcp_minisocks.c2
5 files changed, 99 insertions, 22 deletions
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 85a3b1763136..07a02f6e9696 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -157,6 +157,7 @@ void inet_sock_destruct(struct sock *sk)
kfree(rcu_dereference_protected(inet->inet_opt, 1));
dst_release(rcu_dereference_check(sk->sk_dst_cache, 1));
+ dst_release(sk->sk_rx_dst);
sk_refcnt_debug_dec(sk);
}
EXPORT_SYMBOL(inet_sock_destruct);
@@ -1518,14 +1519,15 @@ static const struct net_protocol igmp_protocol = {
#endif
static const struct net_protocol tcp_protocol = {
- .handler = tcp_v4_rcv,
- .err_handler = tcp_v4_err,
- .gso_send_check = tcp_v4_gso_send_check,
- .gso_segment = tcp_tso_segment,
- .gro_receive = tcp4_gro_receive,
- .gro_complete = tcp4_gro_complete,
- .no_policy = 1,
- .netns_ok = 1,
+ .early_demux = tcp_v4_early_demux,
+ .handler = tcp_v4_rcv,
+ .err_handler = tcp_v4_err,
+ .gso_send_check = tcp_v4_gso_send_check,
+ .gso_segment = tcp_tso_segment,
+ .gro_receive = tcp4_gro_receive,
+ .gro_complete = tcp4_gro_complete,
+ .no_policy = 1,
+ .netns_ok = 1,
};
static const struct net_protocol udp_protocol = {
diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c
index c4fe1d271131..93b092c9a394 100644
--- a/net/ipv4/ip_input.c
+++ b/net/ipv4/ip_input.c
@@ -323,19 +323,32 @@ static int ip_rcv_finish(struct sk_buff *skb)
* how the packet travels inside Linux networking.
*/
if (skb_dst(skb) == NULL) {
- int err = ip_route_input_noref(skb, iph->daddr, iph->saddr,
- iph->tos, skb->dev);
- if (unlikely(err)) {
- if (err == -EHOSTUNREACH)
- IP_INC_STATS_BH(dev_net(skb->dev),
- IPSTATS_MIB_INADDRERRORS);
- else if (err == -ENETUNREACH)
- IP_INC_STATS_BH(dev_net(skb->dev),
- IPSTATS_MIB_INNOROUTES);
- else if (err == -EXDEV)
- NET_INC_STATS_BH(dev_net(skb->dev),
- LINUX_MIB_IPRPFILTER);
- goto drop;
+ const struct net_protocol *ipprot;
+ int protocol = iph->protocol;
+ int err;
+
+ rcu_read_lock();
+ ipprot = rcu_dereference(inet_protos[protocol]);
+ err = -ENOENT;
+ if (ipprot && ipprot->early_demux)
+ err = ipprot->early_demux(skb);
+ rcu_read_unlock();
+
+ if (err) {
+ err = ip_route_input_noref(skb, iph->daddr, iph->saddr,
+ iph->tos, skb->dev);
+ if (unlikely(err)) {
+ if (err == -EHOSTUNREACH)
+ IP_INC_STATS_BH(dev_net(skb->dev),
+ IPSTATS_MIB_INADDRERRORS);
+ else if (err == -ENETUNREACH)
+ IP_INC_STATS_BH(dev_net(skb->dev),
+ IPSTATS_MIB_INNOROUTES);
+ else if (err == -EXDEV)
+ NET_INC_STATS_BH(dev_net(skb->dev),
+ LINUX_MIB_IPRPFILTER);
+ goto drop;
+ }
}
}
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index b224eb8bce8b..8416f8a68e65 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -5518,6 +5518,18 @@ int tcp_rcv_established(struct sock *sk, struct sk_buff *skb,
struct tcp_sock *tp = tcp_sk(sk);
int res;
+ if (sk->sk_rx_dst) {
+ struct dst_entry *dst = sk->sk_rx_dst;
+ if (unlikely(dst->obsolete)) {
+ if (dst->ops->check(dst, 0) == NULL) {
+ dst_release(dst);
+ sk->sk_rx_dst = NULL;
+ }
+ }
+ }
+ if (unlikely(sk->sk_rx_dst == NULL))
+ sk->sk_rx_dst = dst_clone(skb_dst(skb));
+
/*
* Header prediction.
* The code loosely follows the one in the famous
@@ -5729,8 +5741,10 @@ void tcp_finish_connect(struct sock *sk, struct sk_buff *skb)
tcp_set_state(sk, TCP_ESTABLISHED);
- if (skb != NULL)
+ if (skb != NULL) {
+ sk->sk_rx_dst = dst_clone(skb_dst(skb));
security_inet_conn_established(sk, skb);
+ }
/* Make sure socket is routed, for correct metrics. */
icsk->icsk_af_ops->rebuild_header(sk);
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index fda2ca17135e..13857df1dae1 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1671,6 +1671,52 @@ csum_err:
}
EXPORT_SYMBOL(tcp_v4_do_rcv);
+int tcp_v4_early_demux(struct sk_buff *skb)
+{
+ struct net *net = dev_net(skb->dev);
+ const struct iphdr *iph;
+ const struct tcphdr *th;
+ struct sock *sk;
+ int err;
+
+ err = -ENOENT;
+ if (skb->pkt_type != PACKET_HOST)
+ goto out_err;
+
+ if (!pskb_may_pull(skb, ip_hdrlen(skb) + sizeof(struct tcphdr)))
+ goto out_err;
+
+ iph = ip_hdr(skb);
+ th = (struct tcphdr *) ((char *)iph + ip_hdrlen(skb));
+
+ if (th->doff < sizeof(struct tcphdr) / 4)
+ goto out_err;
+
+ if (!pskb_may_pull(skb, ip_hdrlen(skb) + th->doff * 4))
+ goto out_err;
+
+ sk = __inet_lookup_established(net, &tcp_hashinfo,
+ iph->saddr, th->source,
+ iph->daddr, th->dest,
+ skb->dev->ifindex);
+ if (sk) {
+ skb->sk = sk;
+ skb->destructor = sock_edemux;
+ if (sk->sk_state != TCP_TIME_WAIT) {
+ struct dst_entry *dst = sk->sk_rx_dst;
+ if (dst)
+ dst = dst_check(dst, 0);
+ if (dst) {
+ skb_dst_set_noref(skb, dst);
+ err = 0;
+ }
+ }
+ }
+
+out_err:
+ return err;
+}
+
/*
* From tcp_input.c
*/
diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c
index cb015317c9f7..72b7c63b1a39 100644
--- a/net/ipv4/tcp_minisocks.c
+++ b/net/ipv4/tcp_minisocks.c
@@ -445,6 +445,8 @@ struct sock *tcp_create_openreq_child(struct sock *sk, struct request_sock *req,
struct tcp_sock *oldtp = tcp_sk(sk);
struct tcp_cookie_values *oldcvp = oldtp->cookie_values;
+ newsk->sk_rx_dst = dst_clone(skb_dst(skb));
+
/* TCP Cookie Transactions require space for the cookie pair,
* as it differs for each connection. There is no need to
* copy any s_data_payload stored at the original socket.
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-12 08:09:17 +0000