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tcp: md5: input path is run under rcu protected sections 

It is guaranteed that both tcp_v4_rcv() and tcp_v6_rcv()
run from rcu read locked sections :

ip_local_deliver_finish() and ip6_input_finish() both
use rcu_read_lock()

Also align tcp_v6_inbound_md5_hash() on tcp_v4_inbound_md5_hash()
by returning a boolean.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2015-03-24 15:58:54 -07:00 committed by David S. Miller
parent 0980c1e308
commit ff74e23f7e
2 changed files with 9 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
net/ipv4/tcp_ipv4.c
View File

@ -1153,8 +1153,9 @@ 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)
/* Called with rcu_read_lock() */
static bool tcp_v4_inbound_md5_hash(struct sock *sk,
const struct sk_buff *skb)
{
/*
* This gets called for each TCP segment that arrives
@ -1206,18 +1207,6 @@ static bool __tcp_v4_inbound_md5_hash(struct sock *sk,
}
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_listener,

25
net/ipv6/tcp_ipv6.c
View File

@ -633,8 +633,7 @@ clear_hash_noput:
return 1;
}
static int __tcp_v6_inbound_md5_hash(struct sock *sk,
const struct sk_buff *skb)
static bool tcp_v6_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb)
{
const __u8 *hash_location = NULL;
struct tcp_md5sig_key *hash_expected;
@ -648,16 +647,16 @@ static int __tcp_v6_inbound_md5_hash(struct sock *sk,
/* We've parsed the options - do we have a hash? */
if (!hash_expected && !hash_location)
return 0;
return false;
if (hash_expected && !hash_location) {
NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND);
return 1;
return true;
}
if (!hash_expected && hash_location) {
NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED);
return 1;
return true;
}
/* check the signature */
@ -670,22 +669,10 @@ static int __tcp_v6_inbound_md5_hash(struct sock *sk,
genhash ? "failed" : "mismatch",
&ip6h->saddr, ntohs(th->source),
&ip6h->daddr, ntohs(th->dest));
return 1;
return true;
}
return 0;
return false;
}
static int tcp_v6_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb)
{
int ret;
rcu_read_lock();
ret = __tcp_v6_inbound_md5_hash(sk, skb);
rcu_read_unlock();
return ret;
}
#endif
static void tcp_v6_init_req(struct request_sock *req, struct sock *sk,