simple-beet-ph-patch-2.6.9

Host Identity Protocol on Linux is an implemetation of the Host Identity Protocol (HIP) and the rela

diff -urN linux-2.6.9/include/linux/in.h linux-2.6.9-simple-patch/include/linux/in.h
--- linux-2.6.9/include/linux/in.h	2004-10-19 00:55:36.000000000 +0300
+++ linux-2.6.9-simple-patch/include/linux/in.h	2006-08-05 15:08:02.000000000 +0300
@@ -39,6 +39,7 @@
 
   IPPROTO_ESP = 50,            /* Encapsulation Security Payload protocol */
   IPPROTO_AH = 51,             /* Authentication Header protocol       */
+  IPPROTO_BEETPH = 94,		/* IP option pseudo header for BEET */
   IPPROTO_PIM    = 103,		/* Protocol Independent Multicast	*/
 
   IPPROTO_COMP   = 108,                /* Compression Header protocol */
diff -urN linux-2.6.9/include/linux/ip.h linux-2.6.9-simple-patch/include/linux/ip.h
--- linux-2.6.9/include/linux/ip.h	2004-10-19 00:53:45.000000000 +0300
+++ linux-2.6.9-simple-patch/include/linux/ip.h	2006-08-05 15:08:02.000000000 +0300
@@ -164,6 +164,8 @@
 
 #endif
 
+#define IPV4_BEET_PHMAXLEN 8
+
 struct iphdr {
 #if defined(__LITTLE_ENDIAN_BITFIELD)
 	__u8	ihl:4,
@@ -207,4 +209,11 @@
 	__u16 cpi;
 };
 
+struct ip_beet_phdr {
+	__u8 nexthdr;
+	__u8 hdrlen;
+	__u8 padlen;
+	__u8 reserved;
+};
+
 #endif	/* _LINUX_IP_H */
diff -urN linux-2.6.9/include/linux/ipsec.h linux-2.6.9-simple-patch/include/linux/ipsec.h
--- linux-2.6.9/include/linux/ipsec.h	2004-10-19 00:53:21.000000000 +0300
+++ linux-2.6.9-simple-patch/include/linux/ipsec.h	2006-08-05 15:08:02.000000000 +0300
@@ -12,7 +12,8 @@
 enum {
 	IPSEC_MODE_ANY		= 0,	/* We do not support this for SA */
 	IPSEC_MODE_TRANSPORT	= 1,
-	IPSEC_MODE_TUNNEL	= 2
+	IPSEC_MODE_TUNNEL	= 2,
+	IPSEC_MODE_BEET         = 3
 };
 
 enum {
diff -urN linux-2.6.9/include/linux/xfrm.h linux-2.6.9-simple-patch/include/linux/xfrm.h
--- linux-2.6.9/include/linux/xfrm.h	2004-10-19 00:53:43.000000000 +0300
+++ linux-2.6.9-simple-patch/include/linux/xfrm.h	2006-08-05 15:08:02.000000000 +0300
@@ -102,6 +102,13 @@
 	XFRM_SHARE_UNIQUE	/* Use once */
 };
 
+enum
+{
+	XFRM_MODE_TRANSPORT = 0,
+	XFRM_MODE_TUNNEL,
+	XFRM_MODE_BEET
+};
+
 /* Netlink configuration messages.  */
 enum {
 	XFRM_MSG_BASE = 0x10,
diff -urN linux-2.6.9/net/ipv4/ah4.c linux-2.6.9-simple-patch/net/ipv4/ah4.c
--- linux-2.6.9/net/ipv4/ah4.c	2004-10-19 00:55:06.000000000 +0300
+++ linux-2.6.9-simple-patch/net/ipv4/ah4.c	2006-08-05 15:08:02.000000000 +0300
@@ -257,8 +257,10 @@
 		goto error;
 	
 	x->props.header_len = XFRM_ALIGN8(sizeof(struct ip_auth_hdr) + ahp->icv_trunc_len);
-	if (x->props.mode)
+	if (x->props.mode == XFRM_MODE_TUNNEL)
 		x->props.header_len += sizeof(struct iphdr);
+	else if (x->props.mode == XFRM_MODE_BEET)
+		x->props.header_len += IPV4_BEET_PHMAXLEN;
 	x->data = ahp;
 
 	return 0;
diff -urN linux-2.6.9/net/ipv4/esp4.c linux-2.6.9-simple-patch/net/ipv4/esp4.c
--- linux-2.6.9/net/ipv4/esp4.c	2004-10-19 00:54:32.000000000 +0300
+++ linux-2.6.9-simple-patch/net/ipv4/esp4.c	2006-08-05 15:18:25.000000000 +0300
@@ -294,7 +294,8 @@
 			 *    as per * draft-ietf-ipsec-udp-encaps-06,
 			 *    section 3.1.2
 			 */
-			if (!x->props.mode)
+			if (x->props.mode == XFRM_MODE_TRANSPORT ||
+			    x->props.mode == XFRM_MODE_BEET)
 				skb->ip_summed = CHECKSUM_UNNECESSARY;
 
 			break;
@@ -307,17 +308,27 @@
 {
 	struct esp_data *esp = x->data;
 	u32 blksize = crypto_tfm_alg_blocksize(esp->conf.tfm);
+	int enclen = 0;
 
-	if (x->props.mode) {
-		mtu = (mtu + 2 + blksize-1)&~(blksize-1);
-	} else {
+	switch (x->props.mode) {
+	default:
+	case XFRM_MODE_TUNNEL:
+		mtu = ALIGN(mtu +2, blksize);
+		break;
+	case XFRM_MODE_TRANSPORT:
+		/* The worst case */
+		mtu = ALIGN(mtu + 2, 4) + blksize - 4;
+		break;
+	case XFRM_MODE_BEET:
 		/* The worst case. */
-		mtu += 2 + blksize;
+		enclen = IPV4_BEET_PHMAXLEN;
+		mtu = ALIGN(mtu + enclen + 2, blksize);
+		break;
 	}
 	if (esp->conf.padlen)
 		mtu = (mtu + esp->conf.padlen-1)&~(esp->conf.padlen-1);
 
-	return mtu + x->props.header_len + esp->auth.icv_trunc_len;
+	return mtu + x->props.header_len + esp->auth.icv_trunc_len - enclen;
 }
 
 static void esp4_err(struct sk_buff *skb, u32 info)
@@ -429,8 +440,10 @@
 	}
 	crypto_cipher_setkey(esp->conf.tfm, esp->conf.key, esp->conf.key_len);
 	x->props.header_len = sizeof(struct ip_esp_hdr) + esp->conf.ivlen;
-	if (x->props.mode)
+	if (x->props.mode == XFRM_MODE_TUNNEL)
 		x->props.header_len += sizeof(struct iphdr);
+	else if (x->props.mode == XFRM_MODE_BEET)
+		x->props.header_len += IPV4_BEET_PHMAXLEN;
 	if (x->encap) {
 		struct xfrm_encap_tmpl *encap = x->encap;
 
diff -urN linux-2.6.9/net/ipv4/ipcomp.c linux-2.6.9-simple-patch/net/ipv4/ipcomp.c
--- linux-2.6.9/net/ipv4/ipcomp.c	2004-10-19 00:55:06.000000000 +0300
+++ linux-2.6.9-simple-patch/net/ipv4/ipcomp.c	2006-08-05 15:19:21.000000000 +0300
@@ -169,7 +169,7 @@
 	hdr_len = iph->ihl * 4;
 	if ((skb->len - hdr_len) < ipcd->threshold) {
 		/* Don't bother compressing */
-		if (x->props.mode) {
+		if (x->props.mode == XFRM_MODE_TUNNEL) {
 			ip_send_check(iph);
 		}
 		goto out_ok;
@@ -245,7 +245,7 @@
 	t->id.daddr.a4 = x->id.daddr.a4;
 	memcpy(&t->sel, &x->sel, sizeof(t->sel));
 	t->props.family = AF_INET;
-	t->props.mode = 1;
+	t->props.mode = x->props.mode;
 	t->props.saddr.a4 = x->props.saddr.a4;
 	t->props.flags = x->props.flags;
 	
@@ -454,8 +454,10 @@
 
 	memset(ipcd, 0, sizeof(*ipcd));
 	x->props.header_len = 0;
-	if (x->props.mode)
+	if (x->props.mode == XFRM_MODE_TUNNEL)
 		x->props.header_len += sizeof(struct iphdr);
+	else if (x->props.mode == XFRM_MODE_BEET)
+		x->props.header_len += IPV4_BEET_PHMAXLEN;
 
 	down(&ipcomp_resource_sem);
 	if (!ipcomp_alloc_scratches())
@@ -466,7 +468,7 @@
 		goto error;
 	up(&ipcomp_resource_sem);
 
-	if (x->props.mode) {
+	if (x->props.mode == XFRM_MODE_TUNNEL) {
 		err = ipcomp_tunnel_attach(x);
 		if (err)
 			goto error_tunnel;
diff -urN linux-2.6.9/net/ipv4/xfrm4_input.c linux-2.6.9-simple-patch/net/ipv4/xfrm4_input.c
--- linux-2.6.9/net/ipv4/xfrm4_input.c	2004-10-19 00:53:21.000000000 +0300
+++ linux-2.6.9-simple-patch/net/ipv4/xfrm4_input.c	2006-08-05 15:08:02.000000000 +0300
@@ -93,7 +93,7 @@
 
 		iph = skb->nh.iph;
 
-		if (x->props.mode) {
+		if (x->props.mode == XFRM_MODE_TUNNEL) {
 			if (iph->protocol != IPPROTO_IPIP)
 				goto drop;
 			if (!pskb_may_pull(skb, sizeof(struct iphdr)))
@@ -111,6 +111,55 @@
 			memset(&(IPCB(skb)->opt), 0, sizeof(struct ip_options));
 			decaps = 1;
 			break;
+		} else if (x->props.mode == XFRM_MODE_BEET) {
+			struct ip_beet_phdr *ph = (struct ip_beet_phdr*)(iph + 1);
+			int phlen = 0;
+			int optlen = 0;
+			__u8 ph_nexthdr = 0, protocol = 0;
+
+			protocol = iph->protocol;
+			if (unlikely(iph->protocol == IPPROTO_BEETPH)) {
+				if (!pskb_may_pull(skb, sizeof(*ph)))
+					goto drop;
+				phlen = ph->hdrlen * 8;
+				optlen = phlen - ph->padlen - sizeof(*ph);
+
+				if (optlen < 0 || optlen & 3 || optlen > 250)
+					goto drop;
+				if (!pskb_may_pull(skb, phlen))
+					goto drop;
+
+				ph_nexthdr = ph->nexthdr;
+			}
+
+			if (skb_cloned(skb) &&
+			    pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
+				goto drop;
+
+			skb_push(skb, sizeof(struct iphdr));
+			memmove(skb->data, skb->nh.raw, sizeof(struct iphdr));
+			skb->nh.raw = skb->data;
+
+			if (unlikely(phlen)) {
+				skb_pull(skb, phlen - optlen);
+				memmove(skb->data, skb->nh.raw, sizeof(*iph));
+				skb->nh.raw = skb->data;
+				iph = skb->nh.iph;
+			}
+
+			iph = skb->nh.iph;
+			iph->ihl = (sizeof(*iph) + optlen) / 4;
+			iph->tot_len = htons(skb->len);
+			iph->daddr = x->sel.daddr.a4;
+			iph->saddr = x->sel.saddr.a4;
+			if (ph_nexthdr)
+				iph->protocol = ph_nexthdr;
+			else
+				iph->protocol = protocol;
+			iph->check = 0;
+			iph->check = ip_fast_csum(skb->nh.raw, iph->ihl);
+			decaps = 1;
+			break;
 		}
 
 		if ((err = xfrm_parse_spi(skb, skb->nh.iph->protocol, &spi, &seq)) < 0)
diff -urN linux-2.6.9/net/ipv4/xfrm4_output.c linux-2.6.9-simple-patch/net/ipv4/xfrm4_output.c
--- linux-2.6.9/net/ipv4/xfrm4_output.c	2004-10-19 00:53:44.000000000 +0300
+++ linux-2.6.9-simple-patch/net/ipv4/xfrm4_output.c	2006-08-06 14:20:55.000000000 +0300
@@ -33,38 +33,76 @@
 	struct dst_entry *dst = skb->dst;
 	struct xfrm_state *x = dst->xfrm;
 	struct iphdr *iph, *top_iph;
+	int flags;
+	int hdrlen, optlen;
 
 	iph = skb->nh.iph;
 	skb->h.ipiph = iph;
 
-	skb->nh.raw = skb_push(skb, x->props.header_len);
-	top_iph = skb->nh.iph;
-
-	if (!x->props.mode) {
-		skb->h.raw += iph->ihl*4;
-		memmove(top_iph, iph, iph->ihl*4);
-		return;
+	hdrlen = x->props.header_len;
+	optlen = iph->ihl * 4 - sizeof(*iph);
+	if (x->props.mode == XFRM_MODE_BEET) {
+		if (!optlen) {
+			hdrlen -= IPV4_BEET_PHMAXLEN;
+		}
+		else {
+			skb->h.raw -= (IPV4_BEET_PHMAXLEN - (optlen & 4));
+			hdrlen -= optlen & 4;
+		}
 	}
 
-	top_iph->ihl = 5;
-	top_iph->version = 4;
-
-	/* DS disclosed */
-	top_iph->tos = INET_ECN_encapsulate(iph->tos, iph->tos);
-	if (x->props.flags & XFRM_STATE_NOECN)
-		IP_ECN_clear(top_iph);
-
-	top_iph->frag_off = iph->frag_off & htons(IP_DF);
-	if (!top_iph->frag_off)
-		__ip_select_ident(top_iph, dst, 0);