lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

ipv6: Consolidate route lookup sequences.

Browse Source 
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>
This commit is contained in:
David S. Miller
2011-03-01 13:19:07 -08:00
parent 903ab86d19
commit 68d0c6d34d
10 changed files with 143 additions and 166 deletions
Download Patch File Download Diff File Expand all files Collapse all files

65
net/dccp/ipv6.c
View File

@@ -162,15 +162,9 @@ static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
fl.fl_ip_sport = inet->inet_sport;
security_sk_classify_flow(sk, &fl);
err = ip6_dst_lookup(sk, &dst, &fl);
if (err) {
sk->sk_err_soft = -err;
goto out;
}
err = xfrm_lookup(net, &dst, &fl, sk, 0);
if (err < 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;
}
} else
@@ -267,16 +261,12 @@ static int dccp_v6_send_response(struct sock *sk, struct request_sock *req,
final_p = fl6_update_dst(&fl, opt, &final);
err = ip6_dst_lookup(sk, &dst, &fl);
if (err)
goto done;
if (final_p)
ipv6_addr_copy(&fl.fl6_dst, final_p);
err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0);
if (err < 0)
dst = ip6_dst_lookup_flow(sk, &fl, final_p, false);
if (IS_ERR(dst)) {
err = PTR_ERR(dst);
dst = NULL;
goto done;
}
skb = dccp_make_response(sk, dst, req);
if (skb != NULL) {
@@ -338,14 +328,13 @@ static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
security_skb_classify_flow(rxskb, &fl);
/* sk = NULL, but it is safe for now. RST socket required. */
if (!ip6_dst_lookup(ctl_sk, &dst, &fl)) {
if (xfrm_lookup(net, &dst, &fl, NULL, 0) >= 0) {
skb_dst_set(skb, dst);
ip6_xmit(ctl_sk, skb, &fl, NULL);
DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
return;
}
dst = ip6_dst_lookup_flow(ctl_sk, &fl, NULL, false);
if (!IS_ERR(dst)) {
skb_dst_set(skb, dst);
ip6_xmit(ctl_sk, skb, &fl, NULL);
DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
return;
}
kfree_skb(skb);
@@ -550,13 +539,8 @@ static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
fl.fl_ip_sport = inet_rsk(req)->loc_port;
security_sk_classify_flow(sk, &fl);
if (ip6_dst_lookup(sk, &dst, &fl))
goto out;
if (final_p)
ipv6_addr_copy(&fl.fl6_dst, final_p);
if ((xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0)
dst = ip6_dst_lookup_flow(sk, &fl, final_p, false);
if (IS_ERR(dst))
goto out;
}
@@ -979,19 +963,10 @@ static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
final_p = fl6_update_dst(&fl, np->opt, &final);
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) {