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authorDavid S. Miller <davem@davemloft.net>2011-03-01 13:19:07 -0800
committerDavid S. Miller <davem@davemloft.net>2011-03-01 13:19:07 -0800
commit68d0c6d34d586a893292d4fb633a3bf8c547b222 (patch)
treeb6d812307621873cf16000171563c1f68b5bc255 /net/ipv6/tcp_ipv6.c
parent903ab86d195cca295379699299c5fc10beba31c7 (diff)
ipv6: Consolidate route lookup sequences.
Route lookups follow a general pattern in the ipv6 code wherein we first find the non-IPSEC route, potentially override the flow destination address due to ipv6 options settings, and then finally make an IPSEC search using either xfrm_lookup() or __xfrm_lookup(). __xfrm_lookup() is used when we want to generate a blackhole route if the key manager needs to resolve the IPSEC rules (in this case -EREMOTE is returned and the original 'dst' is left unchanged). Otherwise plain xfrm_lookup() is used and when asynchronous IPSEC resolution is necessary, we simply fail the lookup completely. All of these cases are encapsulated into two routines, ip6_dst_lookup_flow and ip6_sk_dst_lookup_flow. The latter of which handles unconnected UDP datagram sockets. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/tcp_ipv6.c')
-rw-r--r--net/ipv6/tcp_ipv6.c57
1 files changed, 21 insertions, 36 deletions
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 1d0ab557090..e59a31c48ba 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -255,18 +255,10 @@ static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
security_sk_classify_flow(sk, &fl);
- err = ip6_dst_lookup(sk, &dst, &fl);
- if (err)
+ dst = ip6_dst_lookup_flow(sk, &fl, final_p, true);
+ if (IS_ERR(dst)) {
+ err = PTR_ERR(dst);
goto failure;
- if (final_p)
- ipv6_addr_copy(&fl.fl6_dst, final_p);
-
- err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT);
- if (err < 0) {
- if (err == -EREMOTE)
- err = ip6_dst_blackhole(sk, &dst, &fl);
- if (err < 0)
- goto failure;
}
if (saddr == NULL) {
@@ -385,7 +377,7 @@ static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
np = inet6_sk(sk);
if (type == ICMPV6_PKT_TOOBIG) {
- struct dst_entry *dst = NULL;
+ struct dst_entry *dst;
if (sock_owned_by_user(sk))
goto out;
@@ -413,13 +405,9 @@ static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
fl.fl_ip_sport = inet->inet_sport;
security_skb_classify_flow(skb, &fl);
- if ((err = ip6_dst_lookup(sk, &dst, &fl))) {
- sk->sk_err_soft = -err;
- goto out;
- }
-
- if ((err = xfrm_lookup(net, &dst, &fl, sk, 0)) < 0) {
- sk->sk_err_soft = -err;
+ dst = ip6_dst_lookup_flow(sk, &fl, NULL, false);
+ if (IS_ERR(dst)) {
+ sk->sk_err_soft = -PTR_ERR(dst);
goto out;
}
@@ -496,7 +484,7 @@ static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req,
struct in6_addr * final_p, final;
struct flowi fl;
struct dst_entry *dst;
- int err = -1;
+ int err;
memset(&fl, 0, sizeof(fl));
fl.proto = IPPROTO_TCP;
@@ -512,15 +500,13 @@ static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req,
opt = np->opt;
final_p = fl6_update_dst(&fl, opt, &final);
- err = ip6_dst_lookup(sk, &dst, &fl);
- if (err)
+ dst = ip6_dst_lookup_flow(sk, &fl, final_p, false);
+ if (IS_ERR(dst)) {
+ err = PTR_ERR(dst);
goto done;
- if (final_p)
- ipv6_addr_copy(&fl.fl6_dst, final_p);
- if ((err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0)
- goto done;
-
+ }
skb = tcp_make_synack(sk, dst, req, rvp);
+ err = -ENOMEM;
if (skb) {
__tcp_v6_send_check(skb, &treq->loc_addr, &treq->rmt_addr);
@@ -1079,15 +1065,14 @@ static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win,
* Underlying function will use this to retrieve the network
* namespace
*/
- if (!ip6_dst_lookup(ctl_sk, &dst, &fl)) {
- if (xfrm_lookup(net, &dst, &fl, NULL, 0) >= 0) {
- skb_dst_set(buff, dst);
- ip6_xmit(ctl_sk, buff, &fl, NULL);
- TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS);
- if (rst)
- TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS);
- return;
- }
+ dst = ip6_dst_lookup_flow(ctl_sk, &fl, NULL, false);
+ if (!IS_ERR(dst)) {
+ skb_dst_set(buff, dst);
+ ip6_xmit(ctl_sk, buff, &fl, NULL);
+ TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS);
+ if (rst)
+ TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS);
+ return;
}
kfree_skb(buff);