mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 13:55:32 +00:00
09b8f7a93e
This patch segments GSO packets received by the IPsec stack. This can happen when a NIC driver injects GSO packets into the stack which are then forwarded to another host. The primary application of this is going to be Xen where its backend driver may inject GSO packets into dom0. Of course this also can be used by other virtualisation schemes such as VMWare or UML since the tap device could be modified to inject GSO packets received through splice. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
160 lines
3.1 KiB
C
160 lines
3.1 KiB
C
/*
|
|
* xfrm6_output.c - Common IPsec encapsulation code for IPv6.
|
|
* Copyright (C) 2002 USAGI/WIDE Project
|
|
* Copyright (c) 2004 Herbert Xu <herbert@gondor.apana.org.au>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#include <linux/compiler.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/icmpv6.h>
|
|
#include <linux/netfilter_ipv6.h>
|
|
#include <net/ipv6.h>
|
|
#include <net/xfrm.h>
|
|
|
|
static int xfrm6_tunnel_check_size(struct sk_buff *skb)
|
|
{
|
|
int mtu, ret = 0;
|
|
struct dst_entry *dst = skb->dst;
|
|
|
|
mtu = dst_mtu(dst);
|
|
if (mtu < IPV6_MIN_MTU)
|
|
mtu = IPV6_MIN_MTU;
|
|
|
|
if (skb->len > mtu) {
|
|
skb->dev = dst->dev;
|
|
icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, skb->dev);
|
|
ret = -EMSGSIZE;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int xfrm6_output_one(struct sk_buff *skb)
|
|
{
|
|
struct dst_entry *dst = skb->dst;
|
|
struct xfrm_state *x = dst->xfrm;
|
|
int err;
|
|
|
|
if (skb->ip_summed == CHECKSUM_HW) {
|
|
err = skb_checksum_help(skb, 0);
|
|
if (err)
|
|
goto error_nolock;
|
|
}
|
|
|
|
if (x->props.mode) {
|
|
err = xfrm6_tunnel_check_size(skb);
|
|
if (err)
|
|
goto error_nolock;
|
|
}
|
|
|
|
do {
|
|
spin_lock_bh(&x->lock);
|
|
err = xfrm_state_check(x, skb);
|
|
if (err)
|
|
goto error;
|
|
|
|
err = x->mode->output(skb);
|
|
if (err)
|
|
goto error;
|
|
|
|
err = x->type->output(x, skb);
|
|
if (err)
|
|
goto error;
|
|
|
|
x->curlft.bytes += skb->len;
|
|
x->curlft.packets++;
|
|
|
|
spin_unlock_bh(&x->lock);
|
|
|
|
skb->nh.raw = skb->data;
|
|
|
|
if (!(skb->dst = dst_pop(dst))) {
|
|
err = -EHOSTUNREACH;
|
|
goto error_nolock;
|
|
}
|
|
dst = skb->dst;
|
|
x = dst->xfrm;
|
|
} while (x && !x->props.mode);
|
|
|
|
IP6CB(skb)->flags |= IP6SKB_XFRM_TRANSFORMED;
|
|
err = 0;
|
|
|
|
out_exit:
|
|
return err;
|
|
error:
|
|
spin_unlock_bh(&x->lock);
|
|
error_nolock:
|
|
kfree_skb(skb);
|
|
goto out_exit;
|
|
}
|
|
|
|
static int xfrm6_output_finish2(struct sk_buff *skb)
|
|
{
|
|
int err;
|
|
|
|
while (likely((err = xfrm6_output_one(skb)) == 0)) {
|
|
nf_reset(skb);
|
|
|
|
err = nf_hook(PF_INET6, NF_IP6_LOCAL_OUT, &skb, NULL,
|
|
skb->dst->dev, dst_output);
|
|
if (unlikely(err != 1))
|
|
break;
|
|
|
|
if (!skb->dst->xfrm)
|
|
return dst_output(skb);
|
|
|
|
err = nf_hook(PF_INET6, NF_IP6_POST_ROUTING, &skb, NULL,
|
|
skb->dst->dev, xfrm6_output_finish2);
|
|
if (unlikely(err != 1))
|
|
break;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static int xfrm6_output_finish(struct sk_buff *skb)
|
|
{
|
|
struct sk_buff *segs;
|
|
|
|
if (!skb_shinfo(skb)->gso_size)
|
|
return xfrm6_output_finish2(skb);
|
|
|
|
skb->protocol = htons(ETH_P_IP);
|
|
segs = skb_gso_segment(skb, 0);
|
|
kfree_skb(skb);
|
|
if (unlikely(IS_ERR(segs)))
|
|
return PTR_ERR(segs);
|
|
|
|
do {
|
|
struct sk_buff *nskb = segs->next;
|
|
int err;
|
|
|
|
segs->next = NULL;
|
|
err = xfrm6_output_finish2(segs);
|
|
|
|
if (unlikely(err)) {
|
|
while ((segs = nskb)) {
|
|
nskb = segs->next;
|
|
segs->next = NULL;
|
|
kfree_skb(segs);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
segs = nskb;
|
|
} while (segs);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int xfrm6_output(struct sk_buff *skb)
|
|
{
|
|
return NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, skb, NULL, skb->dst->dev,
|
|
xfrm6_output_finish);
|
|
}
|