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xfrm: remove output_finish indirection from xfrm_state_afinfo

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There are only two implementaions, one for ipv4 and one for ipv6.

Both are almost identical, they clear skb->cb[], set the TRANSFORMED flag
in IP(6)CB and then call the common xfrm_output() function.

By placing the IPCB handling into the common function, we avoid the need
for the output_finish indirection as the output functions can simply
use xfrm_output().

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Florian Westphal 2020-05-04 10:06:09 +02:00 committed by Steffen Klassert
parent f3075f48dd
commit 2ab6096db2
6 changed files with 19 additions and 57 deletions
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1
include/net/xfrm.h
View File

@ -361,7 +361,6 @@ struct xfrm_state_afinfo {
const struct xfrm_type *type_dstopts;
int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
int (*output_finish)(struct sock *sk, struct sk_buff *skb);
int (*transport_finish)(struct sk_buff *skb,
int async);
void (*local_error)(struct sk_buff *skb, u32 mtu);

23
net/ipv4/xfrm4_output.c
View File

@ -14,22 +14,9 @@
#include <net/xfrm.h>
#include <net/icmp.h>
int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb)
{
memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
#ifdef CONFIG_NETFILTER
IPCB(skb)->flags |= IPSKB_XFRM_TRANSFORMED;
#endif
return xfrm_output(sk, skb);
}
static int __xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb)
{
struct xfrm_state *x = skb_dst(skb)->xfrm;
const struct xfrm_state_afinfo *afinfo;
int ret = -EAFNOSUPPORT;
#ifdef CONFIG_NETFILTER
if (!x) {
@ -38,15 +25,7 @@ static int __xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb)
}
#endif
rcu_read_lock();
afinfo = xfrm_state_afinfo_get_rcu(x->outer_mode.family);
if (likely(afinfo))
ret = afinfo->output_finish(sk, skb);
else
kfree_skb(skb);
rcu_read_unlock();
return ret;
return xfrm_output(sk, skb);
}
int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb)

1
net/ipv4/xfrm4_state.c
View File

@ -14,7 +14,6 @@ static struct xfrm_state_afinfo xfrm4_state_afinfo = {
.family = AF_INET,
.proto = IPPROTO_IPIP,
.output = xfrm4_output,
.output_finish = xfrm4_output_finish,
.transport_finish = xfrm4_transport_finish,
.local_error = xfrm4_local_error,
};

34
net/ipv6/xfrm6_output.c
View File

@ -47,39 +47,9 @@ void xfrm6_local_error(struct sk_buff *skb, u32 mtu)
ipv6_local_error(sk, EMSGSIZE, &fl6, mtu);
}
int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb)
{
memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
#ifdef CONFIG_NETFILTER
IP6CB(skb)->flags |= IP6SKB_XFRM_TRANSFORMED;
#endif
return xfrm_output(sk, skb);
}
static int __xfrm6_output_state_finish(struct xfrm_state *x, struct sock *sk,
struct sk_buff *skb)
{
const struct xfrm_state_afinfo *afinfo;
int ret = -EAFNOSUPPORT;
rcu_read_lock();
afinfo = xfrm_state_afinfo_get_rcu(x->outer_mode.family);
if (likely(afinfo))
ret = afinfo->output_finish(sk, skb);
else
kfree_skb(skb);
rcu_read_unlock();
return ret;
}
static int __xfrm6_output_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
{
struct xfrm_state *x = skb_dst(skb)->xfrm;
return __xfrm6_output_state_finish(x, sk, skb);
return xfrm_output(sk, skb);
}
static int __xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb)
@ -121,7 +91,7 @@ static int __xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb)
__xfrm6_output_finish);
skip_frag:
return __xfrm6_output_state_finish(x, sk, skb);
return xfrm_output(sk, skb);
}
int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb)

1
net/ipv6/xfrm6_state.c
View File

@ -18,7 +18,6 @@ static struct xfrm_state_afinfo xfrm6_state_afinfo = {
.family = AF_INET6,
.proto = IPPROTO_IPV6,
.output = xfrm6_output,
.output_finish = xfrm6_output_finish,
.transport_finish = xfrm6_transport_finish,
.local_error = xfrm6_local_error,
};

16
net/xfrm/xfrm_output.c
View File

@ -571,6 +571,22 @@ int xfrm_output(struct sock *sk, struct sk_buff *skb)
struct xfrm_state *x = skb_dst(skb)->xfrm;
int err;
switch (x->outer_mode.family) {
case AF_INET:
memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
#ifdef CONFIG_NETFILTER
IPCB(skb)->flags |= IPSKB_XFRM_TRANSFORMED;
#endif
break;
case AF_INET6:
memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
#ifdef CONFIG_NETFILTER
IP6CB(skb)->flags |= IP6SKB_XFRM_TRANSFORMED;
#endif
break;
}
secpath_reset(skb);
if (xfrm_dev_offload_ok(skb, x)) {