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authorDavid S. Miller <davem@davemloft.net>2012-06-09 01:25:47 -0700
committerDavid S. Miller <davem@davemloft.net>2012-06-09 01:25:47 -0700
commit4670fd819e7f47392c7c6fc6168ea2857c66d163 (patch)
treeb8e90a8a449c0b42b77b54313683ab2d0edb09f3
parentfbfe95a42e90b3dd079cc9019ba7d7700feee0f6 (diff)
downloadop-kernel-dev-4670fd819e7f47392c7c6fc6168ea2857c66d163.zip
op-kernel-dev-4670fd819e7f47392c7c6fc6168ea2857c66d163.tar.gz
tcp: Get rid of inetpeer special cases.
The get_peer method TCP uses is full of special cases that make no sense accommodating, and it also gets in the way of doing more reasonable things here. First of all, if the socket doesn't have a usable cached route, there is no sense in trying to optimize timewait recycling. Likewise for the case where we have IP options, such as SRR enabled, that make the IP header destination address (and thus the destination address of the route key) differ from that of the connection's destination address. Just return a NULL peer in these cases, and thus we're also able to get rid of the clumsy inetpeer release logic. Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--include/net/inet_connection_sock.h2
-rw-r--r--include/net/tcp.h2
-rw-r--r--net/ipv4/tcp_ipv4.c21
-rw-r--r--net/ipv4/tcp_minisocks.c5
-rw-r--r--net/ipv6/tcp_ipv6.c21
5 files changed, 19 insertions, 32 deletions
diff --git a/include/net/inet_connection_sock.h b/include/net/inet_connection_sock.h
index 7d83f90..e1b7734 100644
--- a/include/net/inet_connection_sock.h
+++ b/include/net/inet_connection_sock.h
@@ -43,7 +43,7 @@ struct inet_connection_sock_af_ops {
struct sock *(*syn_recv_sock)(struct sock *sk, struct sk_buff *skb,
struct request_sock *req,
struct dst_entry *dst);
- struct inet_peer *(*get_peer)(struct sock *sk, bool *release_it);
+ struct inet_peer *(*get_peer)(struct sock *sk);
u16 net_header_len;
u16 net_frag_header_len;
u16 sockaddr_len;
diff --git a/include/net/tcp.h b/include/net/tcp.h
index e79aa48..4245918 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -327,7 +327,7 @@ extern void tcp_shutdown (struct sock *sk, int how);
extern int tcp_v4_rcv(struct sk_buff *skb);
-extern struct inet_peer *tcp_v4_get_peer(struct sock *sk, bool *release_it);
+extern struct inet_peer *tcp_v4_get_peer(struct sock *sk);
extern void *tcp_v4_tw_get_peer(struct sock *sk);
extern int tcp_v4_tw_remember_stamp(struct inet_timewait_sock *tw);
extern int tcp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 833e8d9..77f049d 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1820,23 +1820,18 @@ do_time_wait:
goto discard_it;
}
-struct inet_peer *tcp_v4_get_peer(struct sock *sk, bool *release_it)
+struct inet_peer *tcp_v4_get_peer(struct sock *sk)
{
struct rtable *rt = (struct rtable *) __sk_dst_get(sk);
struct inet_sock *inet = inet_sk(sk);
- struct net *net = sock_net(sk);
- struct inet_peer *peer;
-
- if (!rt ||
- inet->cork.fl.u.ip4.daddr != inet->inet_daddr) {
- peer = inet_getpeer_v4(net, inet->inet_daddr, 1);
- *release_it = true;
- } else {
- peer = rt_get_peer_create(rt, inet->inet_daddr);
- *release_it = false;
- }
- return peer;
+ /* If we don't have a valid cached route, or we're doing IP
+ * options which make the IPv4 header destination address
+ * different from our peer's, do not bother with this.
+ */
+ if (!rt || inet->cork.fl.u.ip4.daddr != inet->inet_daddr)
+ return NULL;
+ return rt_get_peer_create(rt, inet->inet_daddr);
}
EXPORT_SYMBOL(tcp_v4_get_peer);
diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c
index b85d9fe..fef9dbf 100644
--- a/net/ipv4/tcp_minisocks.c
+++ b/net/ipv4/tcp_minisocks.c
@@ -60,9 +60,8 @@ static bool tcp_remember_stamp(struct sock *sk)
const struct inet_connection_sock *icsk = inet_csk(sk);
struct tcp_sock *tp = tcp_sk(sk);
struct inet_peer *peer;
- bool release_it;
- peer = icsk->icsk_af_ops->get_peer(sk, &release_it);
+ peer = icsk->icsk_af_ops->get_peer(sk);
if (peer) {
if ((s32)(peer->tcp_ts - tp->rx_opt.ts_recent) <= 0 ||
((u32)get_seconds() - peer->tcp_ts_stamp > TCP_PAWS_MSL &&
@@ -70,8 +69,6 @@ static bool tcp_remember_stamp(struct sock *sk)
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 true;
}
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 218433c..b5ecf37 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1732,23 +1732,18 @@ do_time_wait:
goto discard_it;
}
-static struct inet_peer *tcp_v6_get_peer(struct sock *sk, bool *release_it)
+static struct inet_peer *tcp_v6_get_peer(struct sock *sk)
{
struct rt6_info *rt = (struct rt6_info *) __sk_dst_get(sk);
struct ipv6_pinfo *np = inet6_sk(sk);
- struct net *net = sock_net(sk);
- struct inet_peer *peer;
-
- if (!rt ||
- !ipv6_addr_equal(&np->daddr, &rt->rt6i_dst.addr)) {
- peer = inet_getpeer_v6(net, &np->daddr, 1);
- *release_it = true;
- } else {
- peer = rt6_get_peer_create(rt);
- *release_it = false;
- }
- return peer;
+ /* If we don't have a valid cached route, or we're doing IP
+ * options which make the IPv6 header destination address
+ * different from our peer's, do not bother with this.
+ */
+ if (!rt || !ipv6_addr_equal(&np->daddr, &rt->rt6i_dst.addr))
+ return NULL;
+ return rt6_get_peer_create(rt);
}
static void *tcp_v6_tw_get_peer(struct sock *sk)
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