[IPSEC]: Add XFRMA_SA/XFRMA_POLICY for delete notification
This patch changes the format of the XFRM_MSG_DELSA and
XFRM_MSG_DELPOLICY notification so that the main message
sent is of the same format as that received by the kernel
if the original message was via netlink. This also means
that we won't lose the byid information carried in km_event.
Since this user interface is introduced by Jamal's patch
we can still afford to change it.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index ffe1b21..5ce8558 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -1168,7 +1168,7 @@
static int inline xfrm_sa_len(struct xfrm_state *x)
{
- int l = NLMSG_LENGTH(sizeof(struct xfrm_usersa_info));
+ int l = 0;
if (x->aalg)
l += RTA_SPACE(sizeof(*x->aalg) + (x->aalg->alg_key_len+7)/8);
if (x->ealg)
@@ -1184,20 +1184,39 @@
static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c)
{
struct xfrm_usersa_info *p;
+ struct xfrm_usersa_id *id;
struct nlmsghdr *nlh;
struct sk_buff *skb;
unsigned char *b;
int len = xfrm_sa_len(x);
+ int headlen;
+
+ headlen = sizeof(*p);
+ if (c->event == XFRM_MSG_DELSA) {
+ len += RTA_SPACE(headlen);
+ headlen = sizeof(*id);
+ }
+ len += NLMSG_SPACE(headlen);
skb = alloc_skb(len, GFP_ATOMIC);
if (skb == NULL)
return -ENOMEM;
b = skb->tail;
- nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, sizeof(*p));
+ nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen);
nlh->nlmsg_flags = 0;
p = NLMSG_DATA(nlh);
+ if (c->event == XFRM_MSG_DELSA) {
+ id = NLMSG_DATA(nlh);
+ memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
+ id->spi = x->id.spi;
+ id->family = x->props.family;
+ id->proto = x->id.proto;
+
+ p = RTA_DATA(__RTA_PUT(skb, XFRMA_SA, sizeof(*p)));
+ }
+
copy_to_user_state(x, p);
if (x->aalg)
@@ -1398,20 +1417,39 @@
static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
{
struct xfrm_userpolicy_info *p;
+ struct xfrm_userpolicy_id *id;
struct nlmsghdr *nlh;
struct sk_buff *skb;
unsigned char *b;
int len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
- len += NLMSG_SPACE(sizeof(struct xfrm_userpolicy_info));
+ int headlen;
+
+ headlen = sizeof(*p);
+ if (c->event == XFRM_MSG_DELPOLICY) {
+ len += RTA_SPACE(headlen);
+ headlen = sizeof(*id);
+ }
+ len += NLMSG_SPACE(headlen);
skb = alloc_skb(len, GFP_ATOMIC);
if (skb == NULL)
return -ENOMEM;
b = skb->tail;
- nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, sizeof(*p));
+ nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen);
p = NLMSG_DATA(nlh);
+ if (c->event == XFRM_MSG_DELPOLICY) {
+ id = NLMSG_DATA(nlh);
+ memset(id, 0, sizeof(*id));
+ id->dir = dir;
+ if (c->data.byid)
+ id->index = xp->index;
+ else
+ memcpy(&id->sel, &xp->selector, sizeof(id->sel));
+
+ p = RTA_DATA(__RTA_PUT(skb, XFRMA_POLICY, sizeof(*p)));
+ }
nlh->nlmsg_flags = 0;
@@ -1424,6 +1462,7 @@
return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_POLICY, GFP_ATOMIC);
nlmsg_failure:
+rtattr_failure:
kfree_skb(skb);
return -1;
}