zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/net/xfrm/xfrm_output.c b/ap/os/linux/linux-3.4.x/net/xfrm/xfrm_output.c
new file mode 100644
index 0000000..11dd2fb
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/net/xfrm/xfrm_output.c
@@ -0,0 +1,214 @@
+/*
+ * 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/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_skb_check_space(struct sk_buff *skb)
+{
+ 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) {
+ if (ntail <= 0)
+ return 0;
+ nhead = 0;
+ } else if (ntail < 0)
+ ntail = 0;
+
+ return pskb_expand_head(skb, nhead, ntail, GFP_ATOMIC);
+}
+
+static int xfrm_output_one(struct sk_buff *skb, int err)
+{
+ struct dst_entry *dst = skb_dst(skb);
+ struct xfrm_state *x = dst->xfrm;
+ struct net *net = xs_net(x);
+
+ if (err <= 0)
+ goto resume;
+
+ do {
+ err = xfrm_skb_check_space(skb);
+ if (err) {
+ XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR);
+ goto error_nolock;
+ }
+
+ err = x->outer_mode->output(x, skb);
+ if (err) {
+ XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEMODEERROR);
+ goto error_nolock;
+ }
+
+ spin_lock_bh(&x->lock);
+ err = xfrm_state_check_expire(x);
+ if (err) {
+ XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEEXPIRED);
+ goto error;
+ }
+
+ err = x->repl->overflow(x, skb);
+ if (err) {
+ XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATESEQERROR);
+ goto error;
+ }
+
+ x->curlft.bytes += skb->len;
+ x->curlft.packets++;
+
+ spin_unlock_bh(&x->lock);
+
+ skb_dst_force(skb);
+
+ err = x->type->output(x, skb);
+ if (err == -EINPROGRESS)
+ goto out_exit;
+
+resume:
+ if (err) {
+ XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEPROTOERROR);
+ goto error_nolock;
+ }
+
+ dst = skb_dst_pop(skb);
+ if (!dst) {
+ XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR);
+ err = -EHOSTUNREACH;
+ goto error_nolock;
+ }
+ skb_dst_set(skb, dst);
+ x = dst->xfrm;
+ } while (x && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL));
+
+ err = 0;
+
+out_exit:
+ return err;
+error:
+ spin_unlock_bh(&x->lock);
+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);
+ if (segs == NULL)
+ return -EINVAL;
+
+ 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);