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xfrm: remove xmit indirection from xfrm_mode

Browse source 
There are only two versions (tunnel and transport). The ip/ipv6 versions
are only differ in sizeof(iphdr) vs ipv6hdr.

Place this in the core and use x->outer_mode->encap type to call the
correct adjustment helper.

Before:
   text   data    bss     dec      filename
15730311  6937008 4046908 26714227 vmlinux

After:
15730428  6937008 4046908 26714344 vmlinux

(about 117 byte increase)

v2: use family from x->outer_mode, not inner

Signed-off-by: Florian Westphal <fw@strlen.de>
Reviewed-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Florian Westphal 2019-03-29 21:16:26 +01:00 committed by Steffen Klassert
parent 0c620e97b3
commit 303c5fab12
6 changed files with 56 additions and 60 deletions
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5
include/net/xfrm.h
View file

@ -454,11 +454,6 @@ struct xfrm_mode {
*/
struct sk_buff *(*gso_segment)(struct xfrm_state *x, struct sk_buff *skb, netdev_features_t features);
/*
* Adjust pointers into the packet when IPsec is done at layer2.
*/
void (*xmit)(struct xfrm_state *x, struct sk_buff *skb);
struct xfrm_state_afinfo *afinfo;
struct module *owner;
u8 encap;

14
net/ipv4/xfrm4_mode_transport.c
View file

@ -30,22 +30,8 @@ static struct sk_buff *xfrm4_transport_gso_segment(struct xfrm_state *x,
return segs;
}
static void xfrm4_transport_xmit(struct xfrm_state *x, struct sk_buff *skb)
{
struct xfrm_offload *xo = xfrm_offload(skb);
skb_reset_mac_len(skb);
pskb_pull(skb, skb->mac_len + sizeof(struct iphdr) + x->props.header_len);
if (xo->flags & XFRM_GSO_SEGMENT) {
skb_reset_transport_header(skb);
skb->transport_header -= x->props.header_len;
}
}
static struct xfrm_mode xfrm4_transport_mode = {
.gso_segment = xfrm4_transport_gso_segment,
.xmit = xfrm4_transport_xmit,
.owner = THIS_MODULE,
.encap = XFRM_MODE_TRANSPORT,
.family = AF_INET,

13
net/ipv4/xfrm4_mode_tunnel.c
View file

@ -109,23 +109,10 @@ static struct sk_buff *xfrm4_mode_tunnel_gso_segment(struct xfrm_state *x,
return skb_mac_gso_segment(skb, features);
}
static void xfrm4_mode_tunnel_xmit(struct xfrm_state *x, struct sk_buff *skb)
{
struct xfrm_offload *xo = xfrm_offload(skb);
if (xo->flags & XFRM_GSO_SEGMENT)
skb->transport_header = skb->network_header +
sizeof(struct iphdr);
skb_reset_mac_len(skb);
pskb_pull(skb, skb->mac_len + x->props.header_len);
}
static struct xfrm_mode xfrm4_tunnel_mode = {
.input2 = xfrm4_mode_tunnel_input,
.output2 = xfrm4_mode_tunnel_output,
.gso_segment = xfrm4_mode_tunnel_gso_segment,
.xmit = xfrm4_mode_tunnel_xmit,
.owner = THIS_MODULE,
.encap = XFRM_MODE_TUNNEL,
.flags = XFRM_MODE_FLAG_TUNNEL,

14
net/ipv6/xfrm6_mode_transport.c
View file

@ -31,22 +31,8 @@ static struct sk_buff *xfrm4_transport_gso_segment(struct xfrm_state *x,
return segs;
}
static void xfrm6_transport_xmit(struct xfrm_state *x, struct sk_buff *skb)
{
struct xfrm_offload *xo = xfrm_offload(skb);
skb_reset_mac_len(skb);
pskb_pull(skb, skb->mac_len + sizeof(struct ipv6hdr) + x->props.header_len);
if (xo->flags & XFRM_GSO_SEGMENT) {
skb_reset_transport_header(skb);
skb->transport_header -= x->props.header_len;
}
}
static struct xfrm_mode xfrm6_transport_mode = {
.gso_segment = xfrm4_transport_gso_segment,
.xmit = xfrm6_transport_xmit,
.owner = THIS_MODULE,
.encap = XFRM_MODE_TRANSPORT,
.family = AF_INET6,

12
net/ipv6/xfrm6_mode_tunnel.c
View file

@ -109,22 +109,10 @@ static struct sk_buff *xfrm6_mode_tunnel_gso_segment(struct xfrm_state *x,
return skb_mac_gso_segment(skb, features);
}
static void xfrm6_mode_tunnel_xmit(struct xfrm_state *x, struct sk_buff *skb)
{
struct xfrm_offload *xo = xfrm_offload(skb);
if (xo->flags & XFRM_GSO_SEGMENT)
skb->transport_header = skb->network_header + sizeof(struct ipv6hdr);
skb_reset_mac_len(skb);
pskb_pull(skb, skb->mac_len + x->props.header_len);
}
static struct xfrm_mode xfrm6_tunnel_mode = {
.input2 = xfrm6_mode_tunnel_input,
.output2 = xfrm6_mode_tunnel_output,
.gso_segment = xfrm6_mode_tunnel_gso_segment,
.xmit = xfrm6_mode_tunnel_xmit,
.owner = THIS_MODULE,
.encap = XFRM_MODE_TUNNEL,
.flags = XFRM_MODE_FLAG_TUNNEL,

58
net/xfrm/xfrm_device.c
View file

@ -23,6 +23,60 @@
#include <linux/notifier.h>
#ifdef CONFIG_XFRM_OFFLOAD
static void __xfrm_transport_prep(struct xfrm_state *x, struct sk_buff *skb,
unsigned int hsize)
{
struct xfrm_offload *xo = xfrm_offload(skb);
skb_reset_mac_len(skb);
pskb_pull(skb, skb->mac_len + hsize + x->props.header_len);
if (xo->flags & XFRM_GSO_SEGMENT) {
skb_reset_transport_header(skb);
skb->transport_header -= x->props.header_len;
}
}
static void __xfrm_mode_tunnel_prep(struct xfrm_state *x, struct sk_buff *skb,
unsigned int hsize)
{
struct xfrm_offload *xo = xfrm_offload(skb);
if (xo->flags & XFRM_GSO_SEGMENT)
skb->transport_header = skb->network_header + hsize;
skb_reset_mac_len(skb);
pskb_pull(skb, skb->mac_len + x->props.header_len);
}
/* Adjust pointers into the packet when IPsec is done at layer2 */
static void xfrm_outer_mode_prep(struct xfrm_state *x, struct sk_buff *skb)
{
switch (x->outer_mode->encap) {
case XFRM_MODE_TUNNEL:
if (x->outer_mode->family == AF_INET)
return __xfrm_mode_tunnel_prep(x, skb,
sizeof(struct iphdr));
if (x->outer_mode->family == AF_INET6)
return __xfrm_mode_tunnel_prep(x, skb,
sizeof(struct ipv6hdr));
break;
case XFRM_MODE_TRANSPORT:
if (x->outer_mode->family == AF_INET)
return __xfrm_transport_prep(x, skb,
sizeof(struct iphdr));
if (x->outer_mode->family == AF_INET6)
return __xfrm_transport_prep(x, skb,
sizeof(struct ipv6hdr));
break;
case XFRM_MODE_ROUTEOPTIMIZATION:
case XFRM_MODE_IN_TRIGGER:
case XFRM_MODE_BEET:
break;
}
}
struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
{
int err;
@ -79,7 +133,7 @@ struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t featur
if (!skb->next) {
esp_features |= skb->dev->gso_partial_features;
x->outer_mode->xmit(x, skb);
xfrm_outer_mode_prep(x, skb);
xo->flags |= XFRM_DEV_RESUME;
@ -109,7 +163,7 @@ struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t featur
xo = xfrm_offload(skb2);
xo->flags |= XFRM_DEV_RESUME;
x->outer_mode->xmit(x, skb2);
xfrm_outer_mode_prep(x, skb2);
err = x->type_offload->xmit(x, skb2, esp_features);
if (!err) {