diff options
Diffstat (limited to 'net/ipv4/tcp_ipv4.c')
| -rw-r--r-- | net/ipv4/tcp_ipv4.c | 41 |
1 files changed, 28 insertions, 13 deletions
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index 992a1f926009..cd17f009aede 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -271,7 +271,7 @@ EXPORT_SYMBOL(tcp_v4_connect); * It can be called through tcp_release_cb() if socket was owned by user * at the time tcp_v4_err() was called to handle ICMP message. */ -static void tcp_v4_mtu_reduced(struct sock *sk) +void tcp_v4_mtu_reduced(struct sock *sk) { struct dst_entry *dst; struct inet_sock *inet = inet_sk(sk); @@ -302,6 +302,7 @@ static void tcp_v4_mtu_reduced(struct sock *sk) tcp_simple_retransmit(sk); } /* else let the usual retransmit timer handle it */ } +EXPORT_SYMBOL(tcp_v4_mtu_reduced); static void do_redirect(struct sk_buff *skb, struct sock *sk) { @@ -1167,7 +1168,8 @@ clear_hash_noput: } EXPORT_SYMBOL(tcp_v4_md5_hash_skb); -static bool tcp_v4_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb) +static bool __tcp_v4_inbound_md5_hash(struct sock *sk, + const struct sk_buff *skb) { /* * This gets called for each TCP segment that arrives @@ -1220,6 +1222,17 @@ static bool tcp_v4_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb) return false; } +static bool tcp_v4_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb) +{ + bool ret; + + rcu_read_lock(); + ret = __tcp_v4_inbound_md5_hash(sk, skb); + rcu_read_unlock(); + + return ret; +} + #endif static void tcp_v4_init_req(struct request_sock *req, struct sock *sk, @@ -1432,16 +1445,6 @@ static struct sock *tcp_v4_hnd_req(struct sock *sk, struct sk_buff *skb) int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb) { struct sock *rsk; -#ifdef CONFIG_TCP_MD5SIG - /* - * We really want to reject the packet as early as possible - * if: - * o We're expecting an MD5'd packet and this is no MD5 tcp option - * o There is an MD5 option and we're not expecting one - */ - if (tcp_v4_inbound_md5_hash(sk, skb)) - goto discard; -#endif if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ struct dst_entry *dst = sk->sk_rx_dst; @@ -1644,6 +1647,18 @@ process: if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) goto discard_and_relse; + +#ifdef CONFIG_TCP_MD5SIG + /* + * We really want to reject the packet as early as possible + * if: + * o We're expecting an MD5'd packet and this is no MD5 tcp option + * o There is an MD5 option and we're not expecting one + */ + if (tcp_v4_inbound_md5_hash(sk, skb)) + goto discard_and_relse; +#endif + nf_reset(skb); if (sk_filter(sk, skb)) @@ -1773,6 +1788,7 @@ const struct inet_connection_sock_af_ops ipv4_specific = { .compat_setsockopt = compat_ip_setsockopt, .compat_getsockopt = compat_ip_getsockopt, #endif + .mtu_reduced = tcp_v4_mtu_reduced, }; EXPORT_SYMBOL(ipv4_specific); @@ -2392,7 +2408,6 @@ struct proto tcp_prot = { .sendpage = tcp_sendpage, .backlog_rcv = tcp_v4_do_rcv, .release_cb = tcp_release_cb, - .mtu_reduced = tcp_v4_mtu_reduced, .hash = inet_hash, .unhash = inet_unhash, .get_port = inet_csk_get_port, |