From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Wed, 5 Aug 2015 17:04:01 -0300
Subject: Initial import

---
 net/ipv6/xfrm6_input.c | 145 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 145 insertions(+)
 create mode 100644 net/ipv6/xfrm6_input.c

(limited to 'net/ipv6/xfrm6_input.c')

diff --git a/net/ipv6/xfrm6_input.c b/net/ipv6/xfrm6_input.c
new file mode 100644
index 000000000..74bd17882
--- /dev/null
+++ b/net/ipv6/xfrm6_input.c
@@ -0,0 +1,145 @@
+/*
+ * xfrm6_input.c: based on net/ipv4/xfrm4_input.c
+ *
+ * Authors:
+ *	Mitsuru KANDA @USAGI
+ *	Kazunori MIYAZAWA @USAGI
+ *	Kunihiro Ishiguro <kunihiro@ipinfusion.com>
+ *	YOSHIFUJI Hideaki @USAGI
+ *		IPv6 support
+ */
+
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv6.h>
+#include <net/ipv6.h>
+#include <net/xfrm.h>
+
+int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb)
+{
+	return xfrm6_extract_header(skb);
+}
+
+int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
+{
+	XFRM_SPI_SKB_CB(skb)->family = AF_INET6;
+	XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr);
+	return xfrm_input(skb, nexthdr, spi, 0);
+}
+EXPORT_SYMBOL(xfrm6_rcv_spi);
+
+int xfrm6_transport_finish(struct sk_buff *skb, int async)
+{
+	skb_network_header(skb)[IP6CB(skb)->nhoff] =
+		XFRM_MODE_SKB_CB(skb)->protocol;
+
+#ifndef CONFIG_NETFILTER
+	if (!async)
+		return 1;
+#endif
+
+	ipv6_hdr(skb)->payload_len = htons(skb->len);
+	__skb_push(skb, skb->data - skb_network_header(skb));
+
+	NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING, NULL, skb,
+		skb->dev, NULL,
+		ip6_rcv_finish);
+	return -1;
+}
+
+int xfrm6_rcv(struct sk_buff *skb)
+{
+	return xfrm6_rcv_spi(skb, skb_network_header(skb)[IP6CB(skb)->nhoff],
+			     0);
+}
+EXPORT_SYMBOL(xfrm6_rcv);
+
+int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
+		     xfrm_address_t *saddr, u8 proto)
+{
+	struct net *net = dev_net(skb->dev);
+	struct xfrm_state *x = NULL;
+	int i = 0;
+
+	/* Allocate new secpath or COW existing one. */
+	if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) {
+		struct sec_path *sp;
+
+		sp = secpath_dup(skb->sp);
+		if (!sp) {
+			XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
+			goto drop;
+		}
+		if (skb->sp)
+			secpath_put(skb->sp);
+		skb->sp = sp;
+	}
+
+	if (1 + skb->sp->len == XFRM_MAX_DEPTH) {
+		XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
+		goto drop;
+	}
+
+	for (i = 0; i < 3; i++) {
+		xfrm_address_t *dst, *src;
+
+		switch (i) {
+		case 0:
+			dst = daddr;
+			src = saddr;
+			break;
+		case 1:
+			/* lookup state with wild-card source address */
+			dst = daddr;
+			src = (xfrm_address_t *)&in6addr_any;
+			break;
+		default:
+			/* lookup state with wild-card addresses */
+			dst = (xfrm_address_t *)&in6addr_any;
+			src = (xfrm_address_t *)&in6addr_any;
+			break;
+		}
+
+		x = xfrm_state_lookup_byaddr(net, skb->mark, dst, src, proto, AF_INET6);
+		if (!x)
+			continue;
+
+		spin_lock(&x->lock);
+
+		if ((!i || (x->props.flags & XFRM_STATE_WILDRECV)) &&
+		    likely(x->km.state == XFRM_STATE_VALID) &&
+		    !xfrm_state_check_expire(x)) {
+			spin_unlock(&x->lock);
+			if (x->type->input(x, skb) > 0) {
+				/* found a valid state */
+				break;
+			}
+		} else
+			spin_unlock(&x->lock);
+
+		xfrm_state_put(x);
+		x = NULL;
+	}
+
+	if (!x) {
+		XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES);
+		xfrm_audit_state_notfound_simple(skb, AF_INET6);
+		goto drop;
+	}
+
+	skb->sp->xvec[skb->sp->len++] = x;
+
+	spin_lock(&x->lock);
+
+	x->curlft.bytes += skb->len;
+	x->curlft.packets++;
+
+	spin_unlock(&x->lock);
+
+	return 1;
+
+drop:
+	return -1;
+}
+EXPORT_SYMBOL(xfrm6_input_addr);
-- 
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