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xfrm: change secpath_set to return secpath struct, not error value

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It can only return 0 (success) or -ENOMEM.
Change return value to a pointer to secpath struct.

This avoids direct access to skb->sp:

err = secpath_set(skb);
if (!err) ..
skb->sp-> ...

Becomes:
sp = secpath_set(skb)
if (!sp) ..
sp-> ..

This reduces noise in followup patch which is going to remove skb->sp.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Westphal 2018-12-18 17:15:18 +01:00 committed by David S. Miller
parent de8bda1d22
commit 0ca64da128
5 changed files with 26 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/net/xfrm.h
View File

@ -1131,7 +1131,7 @@ secpath_put(struct sec_path *sp)
}
struct sec_path *secpath_dup(struct sec_path *src);
int secpath_set(struct sk_buff *skb);
struct sec_path *secpath_set(struct sk_buff *skb);
static inline void
secpath_reset(struct sk_buff *skb)

11
net/ipv4/esp4_offload.c
View File

@ -46,11 +46,12 @@ static struct sk_buff *esp4_gro_receive(struct list_head *head,
xo = xfrm_offload(skb);
if (!xo || !(xo->flags & CRYPTO_DONE)) {
err = secpath_set(skb);
if (err)
struct sec_path *sp = secpath_set(skb);
if (!sp)
goto out;
if (skb->sp->len == XFRM_MAX_DEPTH)
if (sp->len == XFRM_MAX_DEPTH)
goto out;
x = xfrm_state_lookup(dev_net(skb->dev), skb->mark,
@ -59,8 +60,8 @@ static struct sk_buff *esp4_gro_receive(struct list_head *head,
if (!x)
goto out;
skb->sp->xvec[skb->sp->len++] = x;
skb->sp->olen++;
sp->xvec[sp->len++] = x;
sp->olen++;
xo = xfrm_offload(skb);
if (!xo) {

11
net/ipv6/esp6_offload.c
View File

@ -68,11 +68,12 @@ static struct sk_buff *esp6_gro_receive(struct list_head *head,
xo = xfrm_offload(skb);
if (!xo || !(xo->flags & CRYPTO_DONE)) {
err = secpath_set(skb);
if (err)
struct sec_path *sp = secpath_set(skb);
if (!sp)
goto out;
if (skb->sp->len == XFRM_MAX_DEPTH)
if (sp->len == XFRM_MAX_DEPTH)
goto out;
x = xfrm_state_lookup(dev_net(skb->dev), skb->mark,
@ -81,8 +82,8 @@ static struct sk_buff *esp6_gro_receive(struct list_head *head,
if (!x)
goto out;
skb->sp->xvec[skb->sp->len++] = x;
skb->sp->olen++;
sp->xvec[sp->len++] = x;
sp->olen++;
xo = xfrm_offload(skb);
if (!xo) {

6
net/ipv6/xfrm6_input.c
View File

@ -86,14 +86,16 @@ int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
{
struct net *net = dev_net(skb->dev);
struct xfrm_state *x = NULL;
struct sec_path *sp;
int i = 0;
if (secpath_set(skb)) {
sp = secpath_set(skb);
if (!sp) {
XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
goto drop;
}
if (1 + skb->sp->len == XFRM_MAX_DEPTH) {
if (1 + sp->len == XFRM_MAX_DEPTH) {
XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
goto drop;
}

16
net/xfrm/xfrm_input.c
View File

@ -145,21 +145,22 @@ struct sec_path *secpath_dup(struct sec_path *src)
}
EXPORT_SYMBOL(secpath_dup);
int secpath_set(struct sk_buff *skb)
struct sec_path *secpath_set(struct sk_buff *skb)
{
struct sec_path *sp;
struct sec_path *sp = skb->sp;
/* Allocate new secpath or COW existing one. */
if (!skb->sp || refcount_read(&skb->sp->refcnt) != 1) {
if (!sp || refcount_read(&sp->refcnt) != 1) {
sp = secpath_dup(skb->sp);
if (!sp)
return -ENOMEM;
return NULL;
if (skb->sp)
secpath_put(skb->sp);
skb->sp = sp;
}
return 0;
return sp;
}
EXPORT_SYMBOL(secpath_set);
@ -236,6 +237,7 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
bool xfrm_gro = false;
bool crypto_done = false;
struct xfrm_offload *xo = xfrm_offload(skb);
struct sec_path *sp;
if (encap_type < 0) {
x = xfrm_input_state(skb);
@ -312,8 +314,8 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
break;
}
err = secpath_set(skb);
if (err) {
sp = secpath_set(skb);
if (!sp) {
XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
goto drop;
}