[XFRM]: Add XFRM_MODE_xxx for future use.

Transformation mode is used as either IPsec transport or tunnel.
It is required to add two more items, route optimization and inbound trigger
for Mobile IPv6.
Based on MIPL2 kernel patch.

This patch was also written by: Ville Nuorvala <vnuorval@tcs.hut.fi>
Signed-off-by: NMasahide NAKAMURA <nakam@linux-ipv6.org>
Signed-off-by: NYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/linux/xfrm.h

@@ -120,7 +120,9 @@ enum
 
 #define XFRM_MODE_TRANSPORT 0
 #define XFRM_MODE_TUNNEL 1
-#define XFRM_MODE_MAX 2
+#define XFRM_MODE_ROUTEOPTIMIZATION 2
+#define XFRM_MODE_IN_TRIGGER 3
+#define XFRM_MODE_MAX 4
 
 /* Netlink configuration messages.  */
 enum {
@@ -247,7 +249,7 @@ struct xfrm_usersa_info {
 	__u32				seq;
 	__u32				reqid;
 	__u16				family;
-	__u8				mode; /* 0=transport,1=tunnel */
+	__u8				mode;		/* XFRM_MODE_xxx */
 	__u8				replay_window;
 	__u8				flags;
 #define XFRM_STATE_NOECN	1

include/net/xfrm.h

@@ -298,7 +298,7 @@ struct xfrm_tmpl
 
 	__u32			reqid;
 
-/* Mode: transport/tunnel */
+/* Mode: transport, tunnel etc. */
 	__u8			mode;
 
 /* Sharing mode: unique, this session only, this user only etc. */

net/ipv4/ah4.c

@@ -265,7 +265,7 @@ static int ah_init_state(struct xfrm_state *x)
 		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);
 	x->data = ahp;
 

net/ipv4/esp4.c

@@ -248,7 +248,7 @@ static int esp_input(struct xfrm_state *x, struct sk_buff *skb)
 		 *    as per draft-ietf-ipsec-udp-encaps-06,
 		 *    section 3.1.2
 		 */
-		if (!x->props.mode)
+		if (x->props.mode == XFRM_MODE_TRANSPORT)
 			skb->ip_summed = CHECKSUM_UNNECESSARY;
 	}
 
@@ -267,7 +267,7 @@ static u32 esp4_get_max_size(struct xfrm_state *x, int mtu)
 	struct esp_data *esp = x->data;
 	u32 blksize = ALIGN(crypto_blkcipher_blocksize(esp->conf.tfm), 4);
 
-	if (x->props.mode) {
+	if (x->props.mode == XFRM_MODE_TUNNEL) {
 		mtu = ALIGN(mtu + 2, blksize);
 	} else {
 		/* The worst case. */
@@ -383,7 +383,7 @@ static int esp_init_state(struct xfrm_state *x)
 	if (crypto_blkcipher_setkey(tfm, esp->conf.key, esp->conf.key_len))
 		goto error;
 	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);
 	if (x->encap) {
 		struct xfrm_encap_tmpl *encap = x->encap;

net/ipv4/ipcomp.c

@@ -176,7 +176,7 @@ static int ipcomp_output(struct xfrm_state *x, struct sk_buff *skb)
 	return 0;
 
 out_ok:
-	if (x->props.mode)
+	if (x->props.mode == XFRM_MODE_TUNNEL)
 		ip_send_check(iph);
 	return 0;
 }
@@ -216,7 +216,7 @@ static struct xfrm_state *ipcomp_tunnel_create(struct xfrm_state *x)
 	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 = XFRM_MODE_TUNNEL;
 	t->props.saddr.a4 = x->props.saddr.a4;
 	t->props.flags = x->props.flags;
 
@@ -416,7 +416,7 @@ static int ipcomp_init_state(struct xfrm_state *x)
 		goto out;
 
 	x->props.header_len = 0;
-	if (x->props.mode)
+	if (x->props.mode == XFRM_MODE_TUNNEL)
 		x->props.header_len += sizeof(struct iphdr);
 
 	mutex_lock(&ipcomp_resource_mutex);
@@ -428,7 +428,7 @@ static int ipcomp_init_state(struct xfrm_state *x)
 		goto error;
 	mutex_unlock(&ipcomp_resource_mutex);
 
-	if (x->props.mode) {
+	if (x->props.mode == XFRM_MODE_TUNNEL) {
 		err = ipcomp_tunnel_attach(x);
 		if (err)
 			goto error_tunnel;

net/ipv4/xfrm4_input.c

@@ -106,7 +106,7 @@ int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
 		if (x->mode->input(x, skb))
 			goto drop;
 
-		if (x->props.mode) {
+		if (x->props.mode == XFRM_MODE_TUNNEL) {
 			decaps = 1;
 			break;
 		}

net/ipv4/xfrm4_output.c

@@ -54,7 +54,7 @@ static int xfrm4_output_one(struct sk_buff *skb)
 			goto error_nolock;
 	}
 
-	if (x->props.mode) {
+	if (x->props.mode == XFRM_MODE_TUNNEL) {
 		err = xfrm4_tunnel_check_size(skb);
 		if (err)
 			goto error_nolock;
@@ -85,7 +85,7 @@ static int xfrm4_output_one(struct sk_buff *skb)
 		}
 		dst = skb->dst;
 		x = dst->xfrm;
-	} while (x && !x->props.mode);
+	} while (x && (x->props.mode != XFRM_MODE_TUNNEL));
 
 	IPCB(skb)->flags |= IPSKB_XFRM_TRANSFORMED;
 	err = 0;

net/ipv4/xfrm4_policy.c

@@ -96,7 +96,7 @@ __xfrm4_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int
 
 		dst1->next = dst_prev;
 		dst_prev = dst1;
-		if (xfrm[i]->props.mode) {
+		if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
 			remote = xfrm[i]->id.daddr.a4;
 			local  = xfrm[i]->props.saddr.a4;
 			tunnel = 1;

net/ipv4/xfrm4_state.c

@@ -42,7 +42,7 @@ __xfrm4_init_tempsel(struct xfrm_state *x, struct flowi *fl,
 	x->props.saddr = tmpl->saddr;
 	if (x->props.saddr.a4 == 0)
 		x->props.saddr.a4 = saddr->a4;
-	if (tmpl->mode && x->props.saddr.a4 == 0) {
+	if (tmpl->mode == XFRM_MODE_TUNNEL && x->props.saddr.a4 == 0) {
 		struct rtable *rt;
 	        struct flowi fl_tunnel = {
         	        .nl_u = {

net/ipv4/xfrm4_tunnel.c

@@ -28,7 +28,7 @@ static int ipip_xfrm_rcv(struct xfrm_state *x, struct sk_buff *skb)
 
 static int ipip_init_state(struct xfrm_state *x)
 {
-	if (!x->props.mode)
+	if (x->props.mode != XFRM_MODE_TUNNEL)
 		return -EINVAL;
 
 	if (x->encap)

net/ipv6/ah6.c

@@ -398,7 +398,7 @@ static int ah6_init_state(struct xfrm_state *x)
 		goto error;
 	
 	x->props.header_len = XFRM_ALIGN8(sizeof(struct ipv6_auth_hdr) + ahp->icv_trunc_len);
-	if (x->props.mode)
+	if (x->props.mode == XFRM_MODE_TUNNEL)
 		x->props.header_len += sizeof(struct ipv6hdr);
 	x->data = ahp;
 

net/ipv6/esp6.c

@@ -237,7 +237,7 @@ static u32 esp6_get_max_size(struct xfrm_state *x, int mtu)
 	struct esp_data *esp = x->data;
 	u32 blksize = ALIGN(crypto_blkcipher_blocksize(esp->conf.tfm), 4);
 
-	if (x->props.mode) {
+	if (x->props.mode == XFRM_MODE_TUNNEL) {
 		mtu = ALIGN(mtu + 2, blksize);
 	} else {
 		/* The worst case. */
@@ -358,7 +358,7 @@ static int esp6_init_state(struct xfrm_state *x)
 	if (crypto_blkcipher_setkey(tfm, esp->conf.key, esp->conf.key_len))
 		goto error;
 	x->props.header_len = sizeof(struct ipv6_esp_hdr) + esp->conf.ivlen;
-	if (x->props.mode)
+	if (x->props.mode == XFRM_MODE_TUNNEL)
 		x->props.header_len += sizeof(struct ipv6hdr);
 	x->data = esp;
 	return 0;

net/ipv6/ipcomp6.c

@@ -212,7 +212,7 @@ static struct xfrm_state *ipcomp6_tunnel_create(struct xfrm_state *x)
 	memcpy(t->id.daddr.a6, x->id.daddr.a6, sizeof(struct in6_addr));
 	memcpy(&t->sel, &x->sel, sizeof(t->sel));
 	t->props.family = AF_INET6;
-	t->props.mode = 1;
+	t->props.mode = XFRM_MODE_TUNNEL;
 	memcpy(t->props.saddr.a6, x->props.saddr.a6, sizeof(struct in6_addr));
 
 	if (xfrm_init_state(t))
@@ -417,7 +417,7 @@ static int ipcomp6_init_state(struct xfrm_state *x)
 		goto out;
 
 	x->props.header_len = 0;
-	if (x->props.mode)
+	if (x->props.mode == XFRM_MODE_TUNNEL)
 		x->props.header_len += sizeof(struct ipv6hdr);
 	
 	mutex_lock(&ipcomp6_resource_mutex);
@@ -429,7 +429,7 @@ static int ipcomp6_init_state(struct xfrm_state *x)
 		goto error;
 	mutex_unlock(&ipcomp6_resource_mutex);
 
-	if (x->props.mode) {
+	if (x->props.mode == XFRM_MODE_TUNNEL) {
 		err = ipcomp6_tunnel_attach(x);
 		if (err)
 			goto error_tunnel;

net/ipv6/xfrm6_input.c

@@ -72,7 +72,7 @@ int xfrm6_rcv_spi(struct sk_buff *skb, u32 spi)
 		if (x->mode->input(x, skb))
 			goto drop;
 
-		if (x->props.mode) { /* XXX */
+		if (x->props.mode == XFRM_MODE_TUNNEL) { /* XXX */
 			decaps = 1;
 			break;
 		}

net/ipv6/xfrm6_output.c

@@ -47,7 +47,7 @@ static int xfrm6_output_one(struct sk_buff *skb)
 			goto error_nolock;
 	}
 
-	if (x->props.mode) {
+	if (x->props.mode == XFRM_MODE_TUNNEL) {
 		err = xfrm6_tunnel_check_size(skb);
 		if (err)
 			goto error_nolock;
@@ -80,7 +80,7 @@ static int xfrm6_output_one(struct sk_buff *skb)
 		}
 		dst = skb->dst;
 		x = dst->xfrm;
-	} while (x && !x->props.mode);
+	} while (x && (x->props.mode != XFRM_MODE_TUNNEL));
 
 	IP6CB(skb)->flags |= IP6SKB_XFRM_TRANSFORMED;
 	err = 0;

net/ipv6/xfrm6_policy.c

@@ -114,7 +114,7 @@ __xfrm6_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int
 
 		dst1->next = dst_prev;
 		dst_prev = dst1;
-		if (xfrm[i]->props.mode) {
+		if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
 			remote = (struct in6_addr*)&xfrm[i]->id.daddr;
 			local  = (struct in6_addr*)&xfrm[i]->props.saddr;
 			tunnel = 1;

net/ipv6/xfrm6_state.c

@@ -42,7 +42,7 @@ __xfrm6_init_tempsel(struct xfrm_state *x, struct flowi *fl,
 	memcpy(&x->props.saddr, &tmpl->saddr, sizeof(x->props.saddr));
 	if (ipv6_addr_any((struct in6_addr*)&x->props.saddr))
 		memcpy(&x->props.saddr, saddr, sizeof(x->props.saddr));
-	if (tmpl->mode && ipv6_addr_any((struct in6_addr*)&x->props.saddr)) {
+	if (tmpl->mode == XFRM_MODE_TUNNEL && ipv6_addr_any((struct in6_addr*)&x->props.saddr)) {
 		struct rt6_info *rt;
 		struct flowi fl_tunnel = {
 			.nl_u = {

net/ipv6/xfrm6_tunnel.c

@@ -307,7 +307,7 @@ static int xfrm6_tunnel_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 
 static int xfrm6_tunnel_init_state(struct xfrm_state *x)
 {
-	if (!x->props.mode)
+	if (x->props.mode != XFRM_MODE_TUNNEL)
 		return -EINVAL;
 
 	if (x->encap)

net/key/af_key.c

@@ -1765,7 +1765,7 @@ parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
 	}
 
 	/* addresses present only in tunnel mode */
-	if (t->mode) {
+	if (t->mode == XFRM_MODE_TUNNEL) {
 		switch (xp->family) {
 		case AF_INET:
 			sin = (void*)(rq+1);
@@ -1997,7 +1997,7 @@ static void pfkey_xfrm_policy2msg(struct sk_buff *skb, struct xfrm_policy *xp, i
 		int req_size;
 
 		req_size = sizeof(struct sadb_x_ipsecrequest);
-		if (t->mode)
+		if (t->mode == XFRM_MODE_TUNNEL)
 			req_size += 2*socklen;
 		else
 			size -= 2*socklen;
@@ -2013,7 +2013,7 @@ static void pfkey_xfrm_policy2msg(struct sk_buff *skb, struct xfrm_policy *xp, i
 		if (t->optional)
 			rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
 		rq->sadb_x_ipsecrequest_reqid = t->reqid;
-		if (t->mode) {
+		if (t->mode == XFRM_MODE_TUNNEL) {
 			switch (xp->family) {
 			case AF_INET:
 				sin = (void*)(rq+1);

net/xfrm/xfrm_policy.c

@@ -779,7 +779,7 @@ xfrm_tmpl_resolve(struct xfrm_policy *policy, struct flowi *fl,
 		xfrm_address_t *local  = saddr;
 		struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
 
-		if (tmpl->mode) {
+		if (tmpl->mode == XFRM_MODE_TUNNEL) {
 			remote = &tmpl->id.daddr;
 			local = &tmpl->saddr;
 		}
@@ -1005,7 +1005,8 @@ xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x,
 		(x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
 		x->props.mode == tmpl->mode &&
 		(tmpl->aalgos & (1<<x->props.aalgo)) &&
-		!(x->props.mode && xfrm_state_addr_cmp(tmpl, x, family));
+		!(x->props.mode != XFRM_MODE_TRANSPORT &&
+		  xfrm_state_addr_cmp(tmpl, x, family));
 }
 
 static inline int
@@ -1015,14 +1016,14 @@ xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start,
 	int idx = start;
 
 	if (tmpl->optional) {
-		if (!tmpl->mode)
+		if (tmpl->mode == XFRM_MODE_TRANSPORT)
 			return start;
 	} else
 		start = -1;
 	for (; idx < sp->len; idx++) {
 		if (xfrm_state_ok(tmpl, sp->xvec[idx], family))
 			return ++idx;
-		if (sp->xvec[idx]->props.mode)
+		if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT)
 			break;
 	}
 	return start;
@@ -1047,7 +1048,7 @@ EXPORT_SYMBOL(xfrm_decode_session);
 static inline int secpath_has_tunnel(struct sec_path *sp, int k)
 {
 	for (; k < sp->len; k++) {
-		if (sp->xvec[k]->props.mode)
+		if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT)
 			return 1;
 	}
 

net/xfrm/xfrm_user.c

@@ -174,8 +174,8 @@ static int verify_newsa_info(struct xfrm_usersa_info *p,
 
 	err = -EINVAL;
 	switch (p->mode) {
-	case 0:
-	case 1:
+	case XFRM_MODE_TRANSPORT:
+	case XFRM_MODE_TUNNEL:
 		break;
 
 	default: