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Diffstat (limited to 'net/xfrm/xfrm_output.c')
-rw-r--r--net/xfrm/xfrm_output.c95
1 files changed, 95 insertions, 0 deletions
diff --git a/net/xfrm/xfrm_output.c b/net/xfrm/xfrm_output.c
new file mode 100644
index 00000000000..0eb3377602e
--- /dev/null
+++ b/net/xfrm/xfrm_output.c
@@ -0,0 +1,95 @@
+/*
+ * xfrm_output.c - Common IPsec encapsulation code.
+ *
+ * Copyright (c) 2007 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/errno.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/spinlock.h>
+#include <net/dst.h>
+#include <net/xfrm.h>
+
+static int xfrm_state_check_space(struct xfrm_state *x, struct sk_buff *skb)
+{
+ int nhead = x->props.header_len + LL_RESERVED_SPACE(skb->dst->dev)
+ - skb_headroom(skb);
+
+ if (nhead > 0)
+ return pskb_expand_head(skb, nhead, 0, GFP_ATOMIC);
+
+ /* Check tail too... */
+ return 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;
+}
+
+int xfrm_output(struct sk_buff *skb)
+{
+ struct dst_entry *dst = skb->dst;
+ struct xfrm_state *x = dst->xfrm;
+ int err;
+
+ if (skb->ip_summed == CHECKSUM_PARTIAL) {
+ err = skb_checksum_help(skb);
+ if (err)
+ goto error_nolock;
+ }
+
+ do {
+ spin_lock_bh(&x->lock);
+ err = xfrm_state_check(x, skb);
+ if (err)
+ goto error;
+
+ if (x->type->flags & XFRM_TYPE_REPLAY_PROT) {
+ XFRM_SKB_CB(skb)->seq = ++x->replay.oseq;
+ if (xfrm_aevent_is_on())
+ xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
+ }
+
+ err = x->mode->output(x, skb);
+ if (err)
+ goto error;
+
+ x->curlft.bytes += skb->len;
+ x->curlft.packets++;
+
+ spin_unlock_bh(&x->lock);
+
+ err = x->type->output(x, skb);
+ if (err)
+ goto error_nolock;
+
+ if (!(skb->dst = dst_pop(dst))) {
+ err = -EHOSTUNREACH;
+ goto error_nolock;
+ }
+ dst = skb->dst;
+ x = dst->xfrm;
+ } while (x && (x->props.mode != XFRM_MODE_TUNNEL));
+
+ err = 0;
+
+error_nolock:
+ return err;
+error:
+ spin_unlock_bh(&x->lock);
+ goto error_nolock;
+}
+EXPORT_SYMBOL_GPL(xfrm_output);