#include <linux/errno.h>
#include <linux/module.h>
#include <linux/netdevice.h>
+#include <linux/netfilter.h>
#include <linux/skbuff.h>
+#include <linux/slab.h>
#include <linux/spinlock.h>
#include <net/dst.h>
#include <net/xfrm.h>
+static int xfrm_output2(struct sk_buff *skb);
+
static int xfrm_state_check_space(struct xfrm_state *x, struct sk_buff *skb)
{
- struct dst_entry *dst = skb->dst;
+ struct dst_entry *dst = skb_dst(skb);
int nhead = dst->header_len + LL_RESERVED_SPACE(dst->dev)
- skb_headroom(skb);
+ int ntail = dst->dev->needed_tailroom - skb_tailroom(skb);
- if (nhead > 0)
- return pskb_expand_head(skb, nhead, 0, GFP_ATOMIC);
-
- /* Check tail too... */
- return 0;
-}
+ if (nhead <= 0) {
+ if (ntail <= 0)
+ return 0;
+ nhead = 0;
+ } else if (ntail < 0)
+ ntail = 0;
-static int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb)
-{
- int err = xfrm_state_check_expire(x);
- if (err < 0)
- goto err;
- err = xfrm_state_check_space(x, skb);
-err:
- return err;
+ return pskb_expand_head(skb, nhead, ntail, GFP_ATOMIC);
}
-int xfrm_output(struct sk_buff *skb)
+static int xfrm_output_one(struct sk_buff *skb, int err)
{
- struct dst_entry *dst = skb->dst;
+ struct dst_entry *dst = skb_dst(skb);
struct xfrm_state *x = dst->xfrm;
- int err;
+ struct net *net = xs_net(x);
- if (skb->ip_summed == CHECKSUM_PARTIAL) {
- err = skb_checksum_help(skb);
- if (err)
- goto error_nolock;
- }
+ if (err <= 0)
+ goto resume;
do {
+ err = xfrm_state_check_space(x, skb);
+ if (err) {
+ XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR);
+ goto error_nolock;
+ }
+
err = x->outer_mode->output(x, skb);
- if (err)
- goto error;
+ if (err) {
+ XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEMODEERROR);
+ goto error_nolock;
+ }
spin_lock_bh(&x->lock);
- err = xfrm_state_check(x, skb);
- if (err)
+ err = xfrm_state_check_expire(x);
+ if (err) {
+ XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEEXPIRED);
goto error;
+ }
if (x->type->flags & XFRM_TYPE_REPLAY_PROT) {
- XFRM_SKB_CB(skb)->seq = ++x->replay.oseq;
- if (xfrm_aevent_is_on())
+ XFRM_SKB_CB(skb)->seq.output = ++x->replay.oseq;
+ if (unlikely(x->replay.oseq == 0)) {
+ XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATESEQERROR);
+ x->replay.oseq--;
+ xfrm_audit_state_replay_overflow(x, skb);
+ err = -EOVERFLOW;
+ goto error;
+ }
+ if (xfrm_aevent_is_on(net))
xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
}
spin_unlock_bh(&x->lock);
err = x->type->output(x, skb);
- if (err)
+ if (err == -EINPROGRESS)
+ goto out_exit;
+
+resume:
+ if (err) {
+ XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEPROTOERROR);
goto error_nolock;
+ }
- if (!(skb->dst = dst_pop(dst))) {
+ dst = dst_pop(dst);
+ if (!dst) {
+ XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR);
err = -EHOSTUNREACH;
goto error_nolock;
}
- dst = skb->dst;
+ skb_dst_set(skb, dst);
x = dst->xfrm;
} while (x && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL));
err = 0;
-error_nolock:
+out_exit:
return err;
error:
spin_unlock_bh(&x->lock);
- goto error_nolock;
+error_nolock:
+ kfree_skb(skb);
+ goto out_exit;
+}
+
+int xfrm_output_resume(struct sk_buff *skb, int err)
+{
+ while (likely((err = xfrm_output_one(skb, err)) == 0)) {
+ nf_reset(skb);
+
+ err = skb_dst(skb)->ops->local_out(skb);
+ if (unlikely(err != 1))
+ goto out;
+
+ if (!skb_dst(skb)->xfrm)
+ return dst_output(skb);
+
+ err = nf_hook(skb_dst(skb)->ops->family,
+ NF_INET_POST_ROUTING, skb,
+ NULL, skb_dst(skb)->dev, xfrm_output2);
+ if (unlikely(err != 1))
+ goto out;
+ }
+
+ if (err == -EINPROGRESS)
+ err = 0;
+
+out:
+ return err;
+}
+EXPORT_SYMBOL_GPL(xfrm_output_resume);
+
+static int xfrm_output2(struct sk_buff *skb)
+{
+ return xfrm_output_resume(skb, 1);
+}
+
+static int xfrm_output_gso(struct sk_buff *skb)
+{
+ struct sk_buff *segs;
+
+ segs = skb_gso_segment(skb, 0);
+ kfree_skb(skb);
+ if (IS_ERR(segs))
+ return PTR_ERR(segs);
+
+ do {
+ struct sk_buff *nskb = segs->next;
+ int err;
+
+ segs->next = NULL;
+ err = xfrm_output2(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 xfrm_output(struct sk_buff *skb)
+{
+ struct net *net = dev_net(skb_dst(skb)->dev);
+ int err;
+
+ if (skb_is_gso(skb))
+ return xfrm_output_gso(skb);
+
+ if (skb->ip_summed == CHECKSUM_PARTIAL) {
+ err = skb_checksum_help(skb);
+ if (err) {
+ XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR);
+ kfree_skb(skb);
+ return err;
+ }
+ }
+
+ return xfrm_output2(skb);
+}
+
+int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb)
+{
+ struct xfrm_mode *inner_mode;
+ if (x->sel.family == AF_UNSPEC)
+ inner_mode = xfrm_ip2inner_mode(x,
+ xfrm_af2proto(skb_dst(skb)->ops->family));
+ else
+ inner_mode = x->inner_mode;
+
+ if (inner_mode == NULL)
+ return -EAFNOSUPPORT;
+ return inner_mode->afinfo->extract_output(x, skb);
+}
+
EXPORT_SYMBOL_GPL(xfrm_output);
+EXPORT_SYMBOL_GPL(xfrm_inner_extract_output);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff