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xfrm: remove get_mtu indirection from xfrm_type

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esp4_get_mtu and esp6_get_mtu are exactly the same, the only difference
is a single sizeof() (ipv4 vs. ipv6 header).

Merge both into xfrm_state_mtu() and remove the indirection.

Signed-off-by: Florian Westphal <[email protected]>
Signed-off-by: Steffen Klassert <[email protected]>
This commit is contained in:
Florian Westphal 2019-06-24 22:04:48 +02:00 • committed by Steffen Klassert
commit c7b37c769d
5 changed files with 34 additions and 56 deletions
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5
net/xfrm/xfrm_device.c
View file

@ -275,9 +275,8 @@ bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
return false;
if ((!dev || (dev == xfrm_dst_path(dst)->dev)) &&
(!xdst->child->xfrm && x->type->get_mtu)) {
mtu = x->type->get_mtu(x, xdst->child_mtu_cached);
(!xdst->child->xfrm)) {
mtu = xfrm_state_mtu(x, xdst->child_mtu_cached);
if (skb->len <= mtu)
goto ok;

34
net/xfrm/xfrm_state.c
View file

@ -27,6 +27,8 @@
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <crypto/aead.h>
#include "xfrm_hash.h"
#define xfrm_state_deref_prot(table, net) \
@ -2403,16 +2405,38 @@ void xfrm_state_delete_tunnel(struct xfrm_state *x)
}
EXPORT_SYMBOL(xfrm_state_delete_tunnel);
int xfrm_state_mtu(struct xfrm_state *x, int mtu)
u32 xfrm_state_mtu(struct xfrm_state *x, int mtu)
{
const struct xfrm_type *type = READ_ONCE(x->type);
struct crypto_aead *aead;
u32 blksize, net_adj = 0;
if (x->km.state == XFRM_STATE_VALID &&
type && type->get_mtu)
return type->get_mtu(x, mtu);
if (x->km.state != XFRM_STATE_VALID ||
!type || type->proto != IPPROTO_ESP)
return mtu - x->props.header_len;
return mtu - x->props.header_len;
aead = x->data;
blksize = ALIGN(crypto_aead_blocksize(aead), 4);
switch (x->props.mode) {
case XFRM_MODE_TRANSPORT:
case XFRM_MODE_BEET:
if (x->props.family == AF_INET)
net_adj = sizeof(struct iphdr);
else if (x->props.family == AF_INET6)
net_adj = sizeof(struct ipv6hdr);
break;
case XFRM_MODE_TUNNEL:
break;
default:
WARN_ON_ONCE(1);
break;
}
return ((mtu - x->props.header_len - crypto_aead_authsize(aead) -
net_adj) & ~(blksize - 1)) + net_adj - 2;
}
EXPORT_SYMBOL_GPL(xfrm_state_mtu);
int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload)
{