1 files changed, 93 insertions, 0 deletions
diff --git a/net/ipv4/xfrm4_state.c b/net/ipv4/xfrm4_state.c
new file mode 100644
index 000000000..80c40b498
--- /dev/null
+++ b/net/ipv4/xfrm4_state.c
@@ -0,0 +1,93 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * xfrm4_state.c
+ *
+ * Changes:
+ * 	YOSHIFUJI Hideaki @USAGI
+ * 		Split up af-specific portion
+ *
+ */
+
+#include <net/ip.h>
+#include <net/xfrm.h>
+#include <linux/pfkeyv2.h>
+#include <linux/ipsec.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/export.h>
+
+static int xfrm4_init_flags(struct xfrm_state *x)
+{
+	if (xs_net(x)->ipv4.sysctl_ip_no_pmtu_disc)
+		x->props.flags |= XFRM_STATE_NOPMTUDISC;
+	return 0;
+}
+
+static void
+__xfrm4_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
+{
+	const struct flowi4 *fl4 = &fl->u.ip4;
+
+	sel->daddr.a4 = fl4->daddr;
+	sel->saddr.a4 = fl4->saddr;
+	sel->dport = xfrm_flowi_dport(fl, &fl4->uli);
+	sel->dport_mask = htons(0xffff);
+	sel->sport = xfrm_flowi_sport(fl, &fl4->uli);
+	sel->sport_mask = htons(0xffff);
+	sel->family = AF_INET;
+	sel->prefixlen_d = 32;
+	sel->prefixlen_s = 32;
+	sel->proto = fl4->flowi4_proto;
+	sel->ifindex = fl4->flowi4_oif;
+}
+
+static void
+xfrm4_init_temprop(struct xfrm_state *x, const struct xfrm_tmpl *tmpl,
+		   const xfrm_address_t *daddr, const xfrm_address_t *saddr)
+{
+	x->id = tmpl->id;
+	if (x->id.daddr.a4 == 0)
+		x->id.daddr.a4 = daddr->a4;
+	x->props.saddr = tmpl->saddr;
+	if (x->props.saddr.a4 == 0)
+		x->props.saddr.a4 = saddr->a4;
+	x->props.mode = tmpl->mode;
+	x->props.reqid = tmpl->reqid;
+	x->props.family = AF_INET;
+}
+
+int xfrm4_extract_header(struct sk_buff *skb)
+{
+	const struct iphdr *iph = ip_hdr(skb);
+
+	XFRM_MODE_SKB_CB(skb)->ihl = sizeof(*iph);
+	XFRM_MODE_SKB_CB(skb)->id = iph->id;
+	XFRM_MODE_SKB_CB(skb)->frag_off = iph->frag_off;
+	XFRM_MODE_SKB_CB(skb)->tos = iph->tos;
+	XFRM_MODE_SKB_CB(skb)->ttl = iph->ttl;
+	XFRM_MODE_SKB_CB(skb)->optlen = iph->ihl * 4 - sizeof(*iph);
+	memset(XFRM_MODE_SKB_CB(skb)->flow_lbl, 0,
+	       sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl));
+
+	return 0;
+}
+
+static struct xfrm_state_afinfo xfrm4_state_afinfo = {
+	.family			= AF_INET,
+	.proto			= IPPROTO_IPIP,
+	.eth_proto		= htons(ETH_P_IP),
+	.owner			= THIS_MODULE,
+	.init_flags		= xfrm4_init_flags,
+	.init_tempsel		= __xfrm4_init_tempsel,
+	.init_temprop		= xfrm4_init_temprop,
+	.output			= xfrm4_output,
+	.output_finish		= xfrm4_output_finish,
+	.extract_input		= xfrm4_extract_input,
+	.extract_output		= xfrm4_extract_output,
+	.transport_finish	= xfrm4_transport_finish,
+	.local_error		= xfrm4_local_error,
+};
+
+void __init xfrm4_state_init(void)
+{
+	xfrm_state_register_afinfo(&xfrm4_state_afinfo);
+}