xfrm: add extack to xfrm_alloc_userspi
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
diff --git a/net/key/af_key.c b/net/key/af_key.c
index 7f4ff5f..e1d2155 100644
--- a/net/key/af_key.c
+++ b/net/key/af_key.c
@@ -1377,13 +1377,13 @@ static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_
max_spi = range->sadb_spirange_max;
}
- err = verify_spi_info(x->id.proto, min_spi, max_spi);
+ err = verify_spi_info(x->id.proto, min_spi, max_spi, NULL);
if (err) {
xfrm_state_put(x);
return err;
}
- err = xfrm_alloc_spi(x, min_spi, max_spi);
+ err = xfrm_alloc_spi(x, min_spi, max_spi, NULL);
resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
if (IS_ERR(resp_skb)) {
diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index 81df34b..d0ae17e 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -2017,7 +2017,7 @@ u32 xfrm_get_acqseq(void)
}
EXPORT_SYMBOL(xfrm_get_acqseq);
-int verify_spi_info(u8 proto, u32 min, u32 max)
+int verify_spi_info(u8 proto, u32 min, u32 max, struct netlink_ext_ack *extack)
{
switch (proto) {
case IPPROTO_AH:
@@ -2026,22 +2026,28 @@ int verify_spi_info(u8 proto, u32 min, u32 max)
case IPPROTO_COMP:
/* IPCOMP spi is 16-bits. */
- if (max >= 0x10000)
+ if (max >= 0x10000) {
+ NL_SET_ERR_MSG(extack, "IPCOMP SPI must be <= 65535");
return -EINVAL;
+ }
break;
default:
+ NL_SET_ERR_MSG(extack, "Invalid protocol, must be one of AH, ESP, IPCOMP");
return -EINVAL;
}
- if (min > max)
+ if (min > max) {
+ NL_SET_ERR_MSG(extack, "Invalid SPI range: min > max");
return -EINVAL;
+ }
return 0;
}
EXPORT_SYMBOL(verify_spi_info);
-int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
+int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high,
+ struct netlink_ext_ack *extack)
{
struct net *net = xs_net(x);
unsigned int h;
@@ -2053,8 +2059,10 @@ int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
u32 mark = x->mark.v & x->mark.m;
spin_lock_bh(&x->lock);
- if (x->km.state == XFRM_STATE_DEAD)
+ if (x->km.state == XFRM_STATE_DEAD) {
+ NL_SET_ERR_MSG(extack, "Target ACQUIRE is in DEAD state");
goto unlock;
+ }
err = 0;
if (x->id.spi)
@@ -2065,6 +2073,7 @@ int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
if (minspi == maxspi) {
x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
if (x0) {
+ NL_SET_ERR_MSG(extack, "Requested SPI is already in use");
xfrm_state_put(x0);
goto unlock;
}
@@ -2089,6 +2098,8 @@ int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
err = 0;
+ } else {
+ NL_SET_ERR_MSG(extack, "No SPI available in the requested range");
}
unlock:
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index c5d6a92..5c280e0 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -1523,7 +1523,7 @@ static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
u32 if_id = 0;
p = nlmsg_data(nlh);
- err = verify_spi_info(p->info.id.proto, p->min, p->max);
+ err = verify_spi_info(p->info.id.proto, p->min, p->max, extack);
if (err)
goto out_noput;
@@ -1551,10 +1551,12 @@ static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
&p->info.saddr, 1,
family);
err = -ENOENT;
- if (!x)
+ if (!x) {
+ NL_SET_ERR_MSG(extack, "Target ACQUIRE not found");
goto out_noput;
+ }
- err = xfrm_alloc_spi(x, p->min, p->max);
+ err = xfrm_alloc_spi(x, p->min, p->max, extack);
if (err)
goto out;
