1 files changed, 73 insertions, 387 deletions

diff --git a/net/ipv4/ipcomp.c b/net/ipv4/ipcomp.c
index fc718df17b4..c0855d50a3f 100644
--- a/net/ipv4/ipcomp.c
+++ b/net/ipv4/ipcomp.c
@@ -5,7 +5,7 @@
  *
  * 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) 
+ * Software Foundation; either version 2 of the License, or (at your option)
  * any later version.
  *
  * Todo:
@@ -13,218 +13,56 @@
  *   - Compression stats.
  *   - Adaptive compression.
  */
-#include <linux/config.h>
 #include <linux/module.h>
-#include <asm/scatterlist.h>
-#include <asm/semaphore.h>
-#include <linux/crypto.h>
-#include <linux/pfkeyv2.h>
-#include <linux/percpu.h>
-#include <linux/smp.h>
-#include <linux/list.h>
-#include <linux/vmalloc.h>
+#include <linux/err.h>
 #include <linux/rtnetlink.h>
 #include <net/ip.h>
 #include <net/xfrm.h>
 #include <net/icmp.h>
 #include <net/ipcomp.h>
+#include <net/protocol.h>
+#include <net/sock.h>
 
-struct ipcomp_tfms {
-	struct list_head list;
-	struct crypto_tfm **tfms;
-	int users;
-};
-
-static DECLARE_MUTEX(ipcomp_resource_sem);
-static void **ipcomp_scratches;
-static int ipcomp_scratch_users;
-static LIST_HEAD(ipcomp_tfms_list);
-
-static int ipcomp_decompress(struct xfrm_state *x, struct sk_buff *skb)
-{
-	int err, plen, dlen;
-	struct iphdr *iph;
-	struct ipcomp_data *ipcd = x->data;
-	u8 *start, *scratch;
-	struct crypto_tfm *tfm;
-	int cpu;
-	
-	plen = skb->len;
-	dlen = IPCOMP_SCRATCH_SIZE;
-	start = skb->data;
-
-	cpu = get_cpu();
-	scratch = *per_cpu_ptr(ipcomp_scratches, cpu);
-	tfm = *per_cpu_ptr(ipcd->tfms, cpu);
-
-	err = crypto_comp_decompress(tfm, start, plen, scratch, &dlen);
-	if (err)
-		goto out;
-
-	if (dlen < (plen + sizeof(struct ip_comp_hdr))) {
-		err = -EINVAL;
-		goto out;
-	}
-
-	err = pskb_expand_head(skb, 0, dlen - plen, GFP_ATOMIC);
-	if (err)
-		goto out;
-		
-	skb_put(skb, dlen - plen);
-	memcpy(skb->data, scratch, dlen);
-	iph = skb->nh.iph;
-	iph->tot_len = htons(dlen + iph->ihl * 4);
-out:	
-	put_cpu();
-	return err;
-}
-
-static int ipcomp_input(struct xfrm_state *x,
-                        struct xfrm_decap_state *decap, struct sk_buff *skb)
+static int ipcomp4_err(struct sk_buff *skb, u32 info)
 {
-	u8 nexthdr;
-	int err = 0;
-	struct iphdr *iph;
-	union {
-		struct iphdr	iph;
-		char 		buf[60];
-	} tmp_iph;
-
-
-	if ((skb_is_nonlinear(skb) || skb_cloned(skb)) &&
-	    skb_linearize(skb, GFP_ATOMIC) != 0) {
-	    	err = -ENOMEM;
-	    	goto out;
-	}
-
-	skb->ip_summed = CHECKSUM_NONE;
-
-	/* Remove ipcomp header and decompress original payload */	
-	iph = skb->nh.iph;
-	memcpy(&tmp_iph, iph, iph->ihl * 4);
-	nexthdr = *(u8 *)skb->data;
-	skb_pull(skb, sizeof(struct ip_comp_hdr));
-	skb->nh.raw += sizeof(struct ip_comp_hdr);
-	memcpy(skb->nh.raw, &tmp_iph, tmp_iph.iph.ihl * 4);
-	iph = skb->nh.iph;
-	iph->tot_len = htons(ntohs(iph->tot_len) - sizeof(struct ip_comp_hdr));
-	iph->protocol = nexthdr;
-	skb->h.raw = skb->data;
-	err = ipcomp_decompress(x, skb);
-
-out:	
-	return err;
-}
-
-static int ipcomp_compress(struct xfrm_state *x, struct sk_buff *skb)
-{
-	int err, plen, dlen, ihlen;
-	struct iphdr *iph = skb->nh.iph;
-	struct ipcomp_data *ipcd = x->data;
-	u8 *start, *scratch;
-	struct crypto_tfm *tfm;
-	int cpu;
-	
-	ihlen = iph->ihl * 4;
-	plen = skb->len - ihlen;
-	dlen = IPCOMP_SCRATCH_SIZE;
-	start = skb->data + ihlen;
-
-	cpu = get_cpu();
-	scratch = *per_cpu_ptr(ipcomp_scratches, cpu);
-	tfm = *per_cpu_ptr(ipcd->tfms, cpu);
-
-	err = crypto_comp_compress(tfm, start, plen, scratch, &dlen);
-	if (err)
-		goto out;
-
-	if ((dlen + sizeof(struct ip_comp_hdr)) >= plen) {
-		err = -EMSGSIZE;
-		goto out;
-	}
-	
-	memcpy(start + sizeof(struct ip_comp_hdr), scratch, dlen);
-	put_cpu();
-
-	pskb_trim(skb, ihlen + dlen + sizeof(struct ip_comp_hdr));
-	return 0;
-	
-out:	
-	put_cpu();
-	return err;
-}
-
-static int ipcomp_output(struct xfrm_state *x, struct sk_buff *skb)
-{
-	int err;
-	struct iphdr *iph;
-	struct ip_comp_hdr *ipch;
-	struct ipcomp_data *ipcd = x->data;
-	int hdr_len = 0;
-
-	iph = skb->nh.iph;
-	iph->tot_len = htons(skb->len);
-	hdr_len = iph->ihl * 4;
-	if ((skb->len - hdr_len) < ipcd->threshold) {
-		/* Don't bother compressing */
-		goto out_ok;
-	}
-
-	if ((skb_is_nonlinear(skb) || skb_cloned(skb)) &&
-	    skb_linearize(skb, GFP_ATOMIC) != 0) {
-		goto out_ok;
-	}
-	
-	err = ipcomp_compress(x, skb);
-	iph = skb->nh.iph;
-
-	if (err) {
-		goto out_ok;
-	}
-
-	/* Install ipcomp header, convert into ipcomp datagram. */
-	iph->tot_len = htons(skb->len);
-	ipch = (struct ip_comp_hdr *)((char *)iph + iph->ihl * 4);
-	ipch->nexthdr = iph->protocol;
-	ipch->flags = 0;
-	ipch->cpi = htons((u16 )ntohl(x->id.spi));
-	iph->protocol = IPPROTO_COMP;
-	ip_send_check(iph);
-	return 0;
-
-out_ok:
-	if (x->props.mode)
-		ip_send_check(iph);
-	return 0;
-}
-
-static void ipcomp4_err(struct sk_buff *skb, u32 info)
-{
-	u32 spi;
-	struct iphdr *iph = (struct iphdr *)skb->data;
+	struct net *net = dev_net(skb->dev);
+	__be32 spi;
+	const struct iphdr *iph = (const struct iphdr *)skb->data;
 	struct ip_comp_hdr *ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2));
 	struct xfrm_state *x;
 
-	if (skb->h.icmph->type != ICMP_DEST_UNREACH ||
-	    skb->h.icmph->code != ICMP_FRAG_NEEDED)
-		return;
+	switch (icmp_hdr(skb)->type) {
+	case ICMP_DEST_UNREACH:
+		if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
+			return 0;
+	case ICMP_REDIRECT:
+		break;
+	default:
+		return 0;
+	}
 
-	spi = ntohl(ntohs(ipch->cpi));
-	x = xfrm_state_lookup((xfrm_address_t *)&iph->daddr,
-	                      spi, IPPROTO_COMP, AF_INET);
+	spi = htonl(ntohs(ipch->cpi));
+	x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
+			      spi, IPPROTO_COMP, AF_INET);
 	if (!x)
-		return;
-	NETDEBUG(KERN_DEBUG "pmtu discovery on SA IPCOMP/%08x/%u.%u.%u.%u\n",
-		 spi, NIPQUAD(iph->daddr));
+		return 0;
+
+	if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
+		ipv4_update_pmtu(skb, net, info, 0, 0, IPPROTO_COMP, 0);
+	else
+		ipv4_redirect(skb, net, 0, 0, IPPROTO_COMP, 0);
 	xfrm_state_put(x);
+
+	return 0;
 }
 
-/* We always hold one tunnel user reference to indicate a tunnel */ 
+/* We always hold one tunnel user reference to indicate a tunnel */
 static struct xfrm_state *ipcomp_tunnel_create(struct xfrm_state *x)
 {
+	struct net *net = xs_net(x);
 	struct xfrm_state *t;
-	
-	t = xfrm_state_alloc();
+
+	t = xfrm_state_alloc(net);
 	if (t == NULL)
 		goto out;
 
@@ -233,9 +71,11 @@ 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 = x->props.mode;
 	t->props.saddr.a4 = x->props.saddr.a4;
 	t->props.flags = x->props.flags;
+	t->props.extra_flags = x->props.extra_flags;
+	memcpy(&t->mark, &x->mark, sizeof(t->mark));
 
 	if (xfrm_init_state(t))
 		goto error;
@@ -252,16 +92,18 @@ error:
 }
 
 /*
- * Must be protected by xfrm_cfg_sem.  State and tunnel user references are
+ * Must be protected by xfrm_cfg_mutex.  State and tunnel user references are
  * always incremented on success.
  */
 static int ipcomp_tunnel_attach(struct xfrm_state *x)
 {
+	struct net *net = xs_net(x);
 	int err = 0;
 	struct xfrm_state *t;
+	u32 mark = x->mark.v & x->mark.m;
 
-	t = xfrm_state_lookup((xfrm_address_t *)&x->id.daddr.a4,
-	                      x->props.saddr.a4, IPPROTO_IPIP, AF_INET);
+	t = xfrm_state_lookup(net, mark, (xfrm_address_t *)&x->id.daddr.a4,
+			      x->props.saddr.a4, IPPROTO_IPIP, AF_INET);
 	if (!t) {
 		t = ipcomp_tunnel_create(x);
 		if (!t) {
@@ -277,224 +119,67 @@ out:
 	return err;
 }
 
-static void ipcomp_free_scratches(void)
-{
-	int i;
-	void **scratches;
-
-	if (--ipcomp_scratch_users)
-		return;
-
-	scratches = ipcomp_scratches;
-	if (!scratches)
-		return;
-
-	for_each_cpu(i) {
-		void *scratch = *per_cpu_ptr(scratches, i);
-		if (scratch)
-			vfree(scratch);
-	}
-
-	free_percpu(scratches);
-}
-
-static void **ipcomp_alloc_scratches(void)
+static int ipcomp4_init_state(struct xfrm_state *x)
 {
-	int i;
-	void **scratches;
-
-	if (ipcomp_scratch_users++)
-		return ipcomp_scratches;
-
-	scratches = alloc_percpu(void *);
-	if (!scratches)
-		return NULL;
-
-	ipcomp_scratches = scratches;
-
-	for_each_cpu(i) {
-		void *scratch = vmalloc(IPCOMP_SCRATCH_SIZE);
-		if (!scratch)
-			return NULL;
-		*per_cpu_ptr(scratches, i) = scratch;
-	}
-
-	return scratches;
-}
-
-static void ipcomp_free_tfms(struct crypto_tfm **tfms)
-{
-	struct ipcomp_tfms *pos;
-	int cpu;
-
-	list_for_each_entry(pos, &ipcomp_tfms_list, list) {
-		if (pos->tfms == tfms)
-			break;
-	}
-
-	BUG_TRAP(pos);
-
-	if (--pos->users)
-		return;
-
-	list_del(&pos->list);
-	kfree(pos);
-
-	if (!tfms)
-		return;
+	int err = -EINVAL;
 
-	for_each_cpu(cpu) {
-		struct crypto_tfm *tfm = *per_cpu_ptr(tfms, cpu);
-		crypto_free_tfm(tfm);
-	}
-	free_percpu(tfms);
-}
-
-static struct crypto_tfm **ipcomp_alloc_tfms(const char *alg_name)
-{
-	struct ipcomp_tfms *pos;
-	struct crypto_tfm **tfms;
-	int cpu;
-
-	/* This can be any valid CPU ID so we don't need locking. */
-	cpu = raw_smp_processor_id();
-
-	list_for_each_entry(pos, &ipcomp_tfms_list, list) {
-		struct crypto_tfm *tfm;
-
-		tfms = pos->tfms;
-		tfm = *per_cpu_ptr(tfms, cpu);
-
-		if (!strcmp(crypto_tfm_alg_name(tfm), alg_name)) {
-			pos->users++;
-			return tfms;
-		}
-	}
-
-	pos = kmalloc(sizeof(*pos), GFP_KERNEL);
-	if (!pos)
-		return NULL;
-
-	pos->users = 1;
-	INIT_LIST_HEAD(&pos->list);
-	list_add(&pos->list, &ipcomp_tfms_list);
-
-	pos->tfms = tfms = alloc_percpu(struct crypto_tfm *);
-	if (!tfms)
-		goto error;
-
-	for_each_cpu(cpu) {
-		struct crypto_tfm *tfm = crypto_alloc_tfm(alg_name, 0);
-		if (!tfm)
-			goto error;
-		*per_cpu_ptr(tfms, cpu) = tfm;
-	}
-
-	return tfms;
-
-error:
-	ipcomp_free_tfms(tfms);
-	return NULL;
-}
-
-static void ipcomp_free_data(struct ipcomp_data *ipcd)
-{
-	if (ipcd->tfms)
-		ipcomp_free_tfms(ipcd->tfms);
-	ipcomp_free_scratches();
-}
-
-static void ipcomp_destroy(struct xfrm_state *x)
-{
-	struct ipcomp_data *ipcd = x->data;
-	if (!ipcd)
-		return;
-	xfrm_state_delete_tunnel(x);
-	down(&ipcomp_resource_sem);
-	ipcomp_free_data(ipcd);
-	up(&ipcomp_resource_sem);
-	kfree(ipcd);
-}
-
-static int ipcomp_init_state(struct xfrm_state *x)
-{
-	int err;
-	struct ipcomp_data *ipcd;
-	struct xfrm_algo_desc *calg_desc;
-
-	err = -EINVAL;
-	if (!x->calg)
-		goto out;
-
-	if (x->encap)
-		goto out;
-
-	err = -ENOMEM;
-	ipcd = kmalloc(sizeof(*ipcd), GFP_KERNEL);
-	if (!ipcd)
-		goto out;
-
-	memset(ipcd, 0, sizeof(*ipcd));
 	x->props.header_len = 0;
-	if (x->props.mode)
+	switch (x->props.mode) {
+	case XFRM_MODE_TRANSPORT:
+		break;
+	case XFRM_MODE_TUNNEL:
 		x->props.header_len += sizeof(struct iphdr);
+		break;
+	default:
+		goto out;
+	}
 
-	down(&ipcomp_resource_sem);
-	if (!ipcomp_alloc_scratches())
-		goto error;
-
-	ipcd->tfms = ipcomp_alloc_tfms(x->calg->alg_name);
-	if (!ipcd->tfms)
-		goto error;
-	up(&ipcomp_resource_sem);
+	err = ipcomp_init_state(x);
+	if (err)
+		goto out;
 
-	if (x->props.mode) {
+	if (x->props.mode == XFRM_MODE_TUNNEL) {
 		err = ipcomp_tunnel_attach(x);
 		if (err)
-			goto error_tunnel;
+			goto out;
 	}
 
-	calg_desc = xfrm_calg_get_byname(x->calg->alg_name, 0);
-	BUG_ON(!calg_desc);
-	ipcd->threshold = calg_desc->uinfo.comp.threshold;
-	x->data = ipcd;
 	err = 0;
 out:
 	return err;
+}
 
-error_tunnel:
-	down(&ipcomp_resource_sem);
-error:
-	ipcomp_free_data(ipcd);
-	up(&ipcomp_resource_sem);
-	kfree(ipcd);
-	goto out;
+static int ipcomp4_rcv_cb(struct sk_buff *skb, int err)
+{
+	return 0;
 }
 
-static struct xfrm_type ipcomp_type = {
+static const struct xfrm_type ipcomp_type = {
 	.description	= "IPCOMP4",
 	.owner		= THIS_MODULE,
 	.proto	     	= IPPROTO_COMP,
-	.init_state	= ipcomp_init_state,
+	.init_state	= ipcomp4_init_state,
 	.destructor	= ipcomp_destroy,
 	.input		= ipcomp_input,
 	.output		= ipcomp_output
 };
 
-static struct net_protocol ipcomp4_protocol = {
+static struct xfrm4_protocol ipcomp4_protocol = {
 	.handler	=	xfrm4_rcv,
+	.input_handler	=	xfrm_input,
+	.cb_handler	=	ipcomp4_rcv_cb,
 	.err_handler	=	ipcomp4_err,
-	.no_policy	=	1,
+	.priority	=	0,
 };
 
 static int __init ipcomp4_init(void)
 {
 	if (xfrm_register_type(&ipcomp_type, AF_INET) < 0) {
-		printk(KERN_INFO "ipcomp init: can't add xfrm type\n");
+		pr_info("%s: can't add xfrm type\n", __func__);
 		return -EAGAIN;
 	}
-	if (inet_add_protocol(&ipcomp4_protocol, IPPROTO_COMP) < 0) {
-		printk(KERN_INFO "ipcomp init: can't add protocol\n");
+	if (xfrm4_protocol_register(&ipcomp4_protocol, IPPROTO_COMP) < 0) {
+		pr_info("%s: can't add protocol\n", __func__);
 		xfrm_unregister_type(&ipcomp_type, AF_INET);
 		return -EAGAIN;
 	}
@@ -503,16 +188,17 @@ static int __init ipcomp4_init(void)
 
 static void __exit ipcomp4_fini(void)
 {
-	if (inet_del_protocol(&ipcomp4_protocol, IPPROTO_COMP) < 0)
-		printk(KERN_INFO "ip ipcomp close: can't remove protocol\n");
+	if (xfrm4_protocol_deregister(&ipcomp4_protocol, IPPROTO_COMP) < 0)
+		pr_info("%s: can't remove protocol\n", __func__);
 	if (xfrm_unregister_type(&ipcomp_type, AF_INET) < 0)
-		printk(KERN_INFO "ip ipcomp close: can't remove xfrm type\n");
+		pr_info("%s: can't remove xfrm type\n", __func__);
 }
 
 module_init(ipcomp4_init);
 module_exit(ipcomp4_fini);
 
 MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("IP Payload Compression Protocol (IPComp) - RFC3173");
+MODULE_DESCRIPTION("IP Payload Compression Protocol (IPComp/IPv4) - RFC3173");
 MODULE_AUTHOR("James Morris <jmorris@intercode.com.au>");
 
+MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_COMP);