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xfrm: Add a secpath_set helper. 

Add a new helper to set the secpath to the skb.
This avoids code duplication, as this is used
in multiple places.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Steffen Klassert 2017-02-15 09:39:24 +01:00
parent 37b103830e
commit b0fcee825c
3 changed files with 26 additions and 24 deletions
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1
include/net/xfrm.h
View File

@ -1006,6 +1006,7 @@ secpath_put(struct sec_path *sp)
}
struct sec_path *secpath_dup(struct sec_path *src);
int secpath_set(struct sk_buff *skb);
static inline void
secpath_reset(struct sk_buff *skb)

15
net/ipv6/xfrm6_input.c
View File

@ -69,18 +69,9 @@ int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
struct xfrm_state *x = NULL;
int i = 0;
/* Allocate new secpath or COW existing one. */
if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) {
struct sec_path *sp;
sp = secpath_dup(skb->sp);
if (!sp) {
XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
goto drop;
}
if (skb->sp)
secpath_put(skb->sp);
skb->sp = sp;
if (secpath_set(skb)) {
XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
goto drop;
}
if (1 + skb->sp->len == XFRM_MAX_DEPTH) {

34
net/xfrm/xfrm_input.c
View File

@ -117,6 +117,24 @@ struct sec_path *secpath_dup(struct sec_path *src)
}
EXPORT_SYMBOL(secpath_dup);
int secpath_set(struct sk_buff *skb)
{
struct sec_path *sp;
/* Allocate new secpath or COW existing one. */
if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) {
sp = secpath_dup(skb->sp);
if (!sp)
return -ENOMEM;
if (skb->sp)
secpath_put(skb->sp);
skb->sp = sp;
}
return 0;
}
EXPORT_SYMBOL(secpath_set);
/* Fetch spi and seq from ipsec header */
int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq)
@ -212,18 +230,10 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
break;
}
/* Allocate new secpath or COW existing one. */
if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) {
struct sec_path *sp;
sp = secpath_dup(skb->sp);
if (!sp) {
XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
goto drop;
}
if (skb->sp)
secpath_put(skb->sp);
skb->sp = sp;
err = secpath_set(skb);
if (err) {
XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
goto drop;
}
seq = 0;