/*
* xfrm4_output.c - Common IPsec encapsulation code for IPv4.
* 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
*/
#include <linux/compiler.h>
+#include <linux/if_ether.h>
+#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/netfilter_ipv4.h>
-#include <net/inet_ecn.h>
#include <net/ip.h>
#include <net/xfrm.h>
#include <net/icmp.h>
-/* Add encapsulation header.
- *
- * In transport mode, the IP header will be moved forward to make space
- * for the encapsulation header.
- *
- * In tunnel mode, the top IP header will be constructed per RFC 2401.
- * The following fields in it shall be filled in by x->type->output:
- * tot_len
- * check
- *
- * On exit, skb->h will be set to the start of the payload to be processed
- * by x->type->output and skb->nh will be set to the top IP header.
- */
-static void xfrm4_encap(struct sk_buff *skb)
-{
- struct dst_entry *dst = skb->dst;
- struct xfrm_state *x = dst->xfrm;
- struct iphdr *iph, *top_iph;
- int flags;
-
- iph = skb->nh.iph;
- skb->h.ipiph = iph;
-
- skb->nh.raw = skb_push(skb, x->props.header_len);
- top_iph = skb->nh.iph;
-
- if (!x->props.mode) {
- skb->h.raw += iph->ihl*4;
- memmove(top_iph, iph, iph->ihl*4);
- return;
- }
-
- top_iph->ihl = 5;
- top_iph->version = 4;
-
- /* DS disclosed */
- top_iph->tos = INET_ECN_encapsulate(iph->tos, iph->tos);
-
- flags = x->props.flags;
- if (flags & XFRM_STATE_NOECN)
- IP_ECN_clear(top_iph);
-
- top_iph->frag_off = (flags & XFRM_STATE_NOPMTUDISC) ?
- 0 : (iph->frag_off & htons(IP_DF));
- if (!top_iph->frag_off)
- __ip_select_ident(top_iph, dst, 0);
-
- top_iph->ttl = dst_metric(dst->child, RTAX_HOPLIMIT);
-
- top_iph->saddr = x->props.saddr.a4;
- top_iph->daddr = x->id.daddr.a4;
- top_iph->protocol = IPPROTO_IPIP;
-
- memset(&(IPCB(skb)->opt), 0, sizeof(struct ip_options));
-}
-
static int xfrm4_tunnel_check_size(struct sk_buff *skb)
{
int mtu, ret = 0;
struct dst_entry *dst;
- struct iphdr *iph = skb->nh.iph;
if (IPCB(skb)->flags & IPSKB_XFRM_TUNNEL_SIZE)
goto out;
IPCB(skb)->flags |= IPSKB_XFRM_TUNNEL_SIZE;
-
- if (!(iph->frag_off & htons(IP_DF)) || skb->local_df)
+
+ if (!(ip_hdr(skb)->frag_off & htons(IP_DF)) || skb->local_df)
goto out;
dst = skb->dst;
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 (skb->ip_summed == CHECKSUM_PARTIAL) {
+ err = skb_checksum_help(skb);
if (err)
goto error_nolock;
}
- if (x->props.mode) {
+ if (x->props.mode == XFRM_MODE_TUNNEL) {
err = xfrm4_tunnel_check_size(skb);
if (err)
goto error_nolock;
if (err)
goto error;
- xfrm4_encap(skb);
+ err = x->mode->output(x, skb);
+ if (err)
+ goto error;
err = x->type->output(x, skb);
if (err)
x->curlft.packets++;
spin_unlock_bh(&x->lock);
-
+
if (!(skb->dst = dst_pop(dst))) {
err = -EHOSTUNREACH;
goto error_nolock;
}
dst = skb->dst;
x = dst->xfrm;
- } while (x && !x->props.mode);
+ } while (x && (x->props.mode != XFRM_MODE_TUNNEL));
IPCB(skb)->flags |= IPSKB_XFRM_TRANSFORMED;
err = 0;
goto out_exit;
}
-static int xfrm4_output_finish(struct sk_buff *skb)
+static int xfrm4_output_finish2(struct sk_buff *skb)
{
int err;
-#ifdef CONFIG_NETFILTER
- if (!skb->dst->xfrm) {
- IPCB(skb)->flags |= IPSKB_REROUTED;
- return dst_output(skb);
- }
-#endif
while (likely((err = xfrm4_output_one(skb)) == 0)) {
nf_reset(skb);
return dst_output(skb);
err = nf_hook(PF_INET, NF_IP_POST_ROUTING, &skb, NULL,
- skb->dst->dev, xfrm4_output_finish);
+ skb->dst->dev, xfrm4_output_finish2);
if (unlikely(err != 1))
break;
}
return err;
}
+static int xfrm4_output_finish(struct sk_buff *skb)
+{
+ struct sk_buff *segs;
+
+#ifdef CONFIG_NETFILTER
+ if (!skb->dst->xfrm) {
+ IPCB(skb)->flags |= IPSKB_REROUTED;
+ return dst_output(skb);
+ }
+#endif
+
+ if (!skb_is_gso(skb))
+ return xfrm4_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 = xfrm4_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 xfrm4_output(struct sk_buff *skb)
{
return NF_HOOK_COND(PF_INET, NF_IP_POST_ROUTING, skb, NULL, skb->dst->dev,
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff