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authorHerbert Xu <herbert@gondor.apana.org.au>2008-10-01 18:03:24 +0400
committerDavid S. Miller <davem@davemloft.net>2008-10-01 18:03:24 +0400
commit12a169e7d8f4b1c95252d8b04ed0f1033ed7cfe2 (patch)
tree9630d7798d4fdfc06d6001ccd057aff68f39f908 /net/key
parentb262e60309e1b0eb25d300c7e739427d5316abb1 (diff)
downloadlinux-12a169e7d8f4b1c95252d8b04ed0f1033ed7cfe2.tar.xz
ipsec: Put dumpers on the dump list
Herbert Xu came up with the idea and the original patch to make xfrm_state dump list contain also dumpers: As it is we go to extraordinary lengths to ensure that states don't go away while dumpers go to sleep. It's much easier if we just put the dumpers themselves on the list since they can't go away while they're going. I've also changed the order of addition on new states to prevent a never-ending dump. Timo Teräs improved the patch to apply cleanly to latest tree, modified iteration code to be more readable by using a common struct for entries in the list, implemented the same idea for xfrm_policy dumping and moved the af_key specific "last" entry caching to af_key. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Timo Teras <timo.teras@iki.fi> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/key')
-rw-r--r--net/key/af_key.c38
1 files changed, 33 insertions, 5 deletions
diff --git a/net/key/af_key.c b/net/key/af_key.c
index b7f5a1c353ee..7ae641df70bd 100644
--- a/net/key/af_key.c
+++ b/net/key/af_key.c
@@ -58,6 +58,7 @@ struct pfkey_sock {
struct xfrm_policy_walk policy;
struct xfrm_state_walk state;
} u;
+ struct sk_buff *skb;
} dump;
};
@@ -76,6 +77,10 @@ static int pfkey_can_dump(struct sock *sk)
static void pfkey_terminate_dump(struct pfkey_sock *pfk)
{
if (pfk->dump.dump) {
+ if (pfk->dump.skb) {
+ kfree_skb(pfk->dump.skb);
+ pfk->dump.skb = NULL;
+ }
pfk->dump.done(pfk);
pfk->dump.dump = NULL;
pfk->dump.done = NULL;
@@ -308,12 +313,25 @@ static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
static int pfkey_do_dump(struct pfkey_sock *pfk)
{
+ struct sadb_msg *hdr;
int rc;
rc = pfk->dump.dump(pfk);
if (rc == -ENOBUFS)
return 0;
+ if (pfk->dump.skb) {
+ if (!pfkey_can_dump(&pfk->sk))
+ return 0;
+
+ hdr = (struct sadb_msg *) pfk->dump.skb->data;
+ hdr->sadb_msg_seq = 0;
+ hdr->sadb_msg_errno = rc;
+ pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
+ &pfk->sk);
+ pfk->dump.skb = NULL;
+ }
+
pfkey_terminate_dump(pfk);
return rc;
}
@@ -1744,9 +1762,14 @@ static int dump_sa(struct xfrm_state *x, int count, void *ptr)
out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
out_hdr->sadb_msg_errno = 0;
out_hdr->sadb_msg_reserved = 0;
- out_hdr->sadb_msg_seq = count;
+ out_hdr->sadb_msg_seq = count + 1;
out_hdr->sadb_msg_pid = pfk->dump.msg_pid;
- pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, &pfk->sk);
+
+ if (pfk->dump.skb)
+ pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
+ &pfk->sk);
+ pfk->dump.skb = out_skb;
+
return 0;
}
@@ -2245,7 +2268,7 @@ static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, struct sadb_msg *h
return 0;
out:
- xp->dead = 1;
+ xp->walk.dead = 1;
xfrm_policy_destroy(xp);
return err;
}
@@ -2583,9 +2606,14 @@ static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
out_hdr->sadb_msg_errno = 0;
- out_hdr->sadb_msg_seq = count;
+ out_hdr->sadb_msg_seq = count + 1;
out_hdr->sadb_msg_pid = pfk->dump.msg_pid;
- pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, &pfk->sk);
+
+ if (pfk->dump.skb)
+ pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
+ &pfk->sk);
+ pfk->dump.skb = out_skb;
+
return 0;
}