1 files changed, 49 insertions, 322 deletions

diff --git a/net/ipv6/ipcomp6.c b/net/ipv6/ipcomp6.c
index e3dcfa2f436..d1c793cffcb 100644
--- a/net/ipv6/ipcomp6.c
+++ b/net/ipv6/ipcomp6.c
@@ -16,8 +16,7 @@
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
 /*
  * [Memo]
@@ -30,11 +29,13 @@
  *  The decompression of IP datagram MUST be done after the reassembly,
  *  AH/ESP processing.
  */
+
+#define pr_fmt(fmt) "IPv6: " fmt
+
 #include <linux/module.h>
 #include <net/ip.h>
 #include <net/xfrm.h>
 #include <net/ipcomp.h>
-#include <asm/semaphore.h>
 #include <linux/crypto.h>
 #include <linux/err.h>
 #include <linux/pfkeyv2.h>
@@ -44,6 +45,7 @@
 #include <linux/list.h>
 #include <linux/vmalloc.h>
 #include <linux/rtnetlink.h>
+#include <net/ip6_route.h>
 #include <net/icmp.h>
 #include <net/ipv6.h>
 #include <net/protocol.h>
@@ -51,157 +53,46 @@
 #include <linux/icmpv6.h>
 #include <linux/mutex.h>
 
-struct ipcomp6_tfms {
-	struct list_head list;
-	struct crypto_comp **tfms;
-	int users;
-};
-
-static DEFINE_MUTEX(ipcomp6_resource_mutex);
-static void **ipcomp6_scratches;
-static int ipcomp6_scratch_users;
-static LIST_HEAD(ipcomp6_tfms_list);
-
-static int ipcomp6_input(struct xfrm_state *x, struct sk_buff *skb)
-{
-	int nexthdr;
-	int err = -ENOMEM;
-	struct ip_comp_hdr *ipch;
-	int plen, dlen;
-	struct ipcomp_data *ipcd = x->data;
-	u8 *start, *scratch;
-	struct crypto_comp *tfm;
-	int cpu;
-
-	if (skb_linearize_cow(skb))
-		goto out;
-
-	skb->ip_summed = CHECKSUM_NONE;
-
-	/* Remove ipcomp header and decompress original payload */
-	ipch = (void *)skb->data;
-	nexthdr = ipch->nexthdr;
-
-	skb->transport_header = skb->network_header + sizeof(*ipch);
-	__skb_pull(skb, sizeof(*ipch));
-
-	/* decompression */
-	plen = skb->len;
-	dlen = IPCOMP_SCRATCH_SIZE;
-	start = skb->data;
-
-	cpu = get_cpu();
-	scratch = *per_cpu_ptr(ipcomp6_scratches, cpu);
-	tfm = *per_cpu_ptr(ipcd->tfms, cpu);
-
-	err = crypto_comp_decompress(tfm, start, plen, scratch, &dlen);
-	if (err)
-		goto out_put_cpu;
-
-	if (dlen < (plen + sizeof(*ipch))) {
-		err = -EINVAL;
-		goto out_put_cpu;
-	}
-
-	err = pskb_expand_head(skb, 0, dlen - plen, GFP_ATOMIC);
-	if (err) {
-		goto out_put_cpu;
-	}
-
-	skb->truesize += dlen - plen;
-	__skb_put(skb, dlen - plen);
-	skb_copy_to_linear_data(skb, scratch, dlen);
-	err = nexthdr;
-
-out_put_cpu:
-	put_cpu();
-out:
-	return err;
-}
-
-static int ipcomp6_output(struct xfrm_state *x, struct sk_buff *skb)
-{
-	int err;
-	struct ip_comp_hdr *ipch;
-	struct ipcomp_data *ipcd = x->data;
-	int plen, dlen;
-	u8 *start, *scratch;
-	struct crypto_comp *tfm;
-	int cpu;
-
-	/* check whether datagram len is larger than threshold */
-	if (skb->len < ipcd->threshold) {
-		goto out_ok;
-	}
-
-	if (skb_linearize_cow(skb))
-		goto out_ok;
-
-	/* compression */
-	plen = skb->len;
-	dlen = IPCOMP_SCRATCH_SIZE;
-	start = skb->data;
-
-	cpu = get_cpu();
-	scratch = *per_cpu_ptr(ipcomp6_scratches, cpu);
-	tfm = *per_cpu_ptr(ipcd->tfms, cpu);
-
-	local_bh_disable();
-	err = crypto_comp_compress(tfm, start, plen, scratch, &dlen);
-	local_bh_enable();
-	if (err || (dlen + sizeof(*ipch)) >= plen) {
-		put_cpu();
-		goto out_ok;
-	}
-	memcpy(start + sizeof(struct ip_comp_hdr), scratch, dlen);
-	put_cpu();
-	pskb_trim(skb, dlen + sizeof(struct ip_comp_hdr));
-
-	/* insert ipcomp header and replace datagram */
-	ipch = ip_comp_hdr(skb);
-	ipch->nexthdr = *skb_mac_header(skb);
-	ipch->flags = 0;
-	ipch->cpi = htons((u16 )ntohl(x->id.spi));
-	*skb_mac_header(skb) = IPPROTO_COMP;
-
-out_ok:
-	skb_push(skb, -skb_network_offset(skb));
-
-	return 0;
-}
-
-static void ipcomp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
-				int type, int code, int offset, __be32 info)
+static int ipcomp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
+				u8 type, u8 code, int offset, __be32 info)
 {
+	struct net *net = dev_net(skb->dev);
 	__be32 spi;
-	struct ipv6hdr *iph = (struct ipv6hdr*)skb->data;
+	const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
 	struct ip_comp_hdr *ipcomph =
 		(struct ip_comp_hdr *)(skb->data + offset);
 	struct xfrm_state *x;
 
-	if (type != ICMPV6_DEST_UNREACH && type != ICMPV6_PKT_TOOBIG)
-		return;
+	if (type != ICMPV6_PKT_TOOBIG &&
+	    type != NDISC_REDIRECT)
+		return 0;
 
 	spi = htonl(ntohs(ipcomph->cpi));
-	x = xfrm_state_lookup((xfrm_address_t *)&iph->daddr, spi, IPPROTO_COMP, AF_INET6);
+	x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
+			      spi, IPPROTO_COMP, AF_INET6);
 	if (!x)
-		return;
+		return 0;
 
-	printk(KERN_DEBUG "pmtu discovery on SA IPCOMP/%08x/" NIP6_FMT "\n",
-			spi, NIP6(iph->daddr));
+	if (type == NDISC_REDIRECT)
+		ip6_redirect(skb, net, skb->dev->ifindex, 0);
+	else
+		ip6_update_pmtu(skb, net, info, 0, 0);
 	xfrm_state_put(x);
+
+	return 0;
 }
 
 static struct xfrm_state *ipcomp6_tunnel_create(struct xfrm_state *x)
 {
+	struct net *net = xs_net(x);
 	struct xfrm_state *t = NULL;
 
-	t = xfrm_state_alloc();
+	t = xfrm_state_alloc(net);
 	if (!t)
 		goto out;
 
 	t->id.proto = IPPROTO_IPV6;
-	t->id.spi = xfrm6_tunnel_alloc_spi((xfrm_address_t *)&x->props.saddr);
+	t->id.spi = xfrm6_tunnel_alloc_spi(net, (xfrm_address_t *)&x->props.saddr);
 	if (!t->id.spi)
 		goto error;
 
@@ -210,6 +101,7 @@ static struct xfrm_state *ipcomp6_tunnel_create(struct xfrm_state *x)
 	t->props.family = AF_INET6;
 	t->props.mode = x->props.mode;
 	memcpy(t->props.saddr.a6, x->props.saddr.a6, sizeof(struct in6_addr));
+	memcpy(&t->mark, &x->mark, sizeof(t->mark));
 
 	if (xfrm_init_state(t))
 		goto error;
@@ -228,13 +120,15 @@ error:
 
 static int ipcomp6_tunnel_attach(struct xfrm_state *x)
 {
+	struct net *net = xs_net(x);
 	int err = 0;
 	struct xfrm_state *t = NULL;
 	__be32 spi;
+	u32 mark = x->mark.m & x->mark.v;
 
-	spi = xfrm6_tunnel_spi_lookup((xfrm_address_t *)&x->props.saddr);
+	spi = xfrm6_tunnel_spi_lookup(net, (xfrm_address_t *)&x->props.saddr);
 	if (spi)
-		t = xfrm_state_lookup((xfrm_address_t *)&x->id.daddr,
+		t = xfrm_state_lookup(net, mark, (xfrm_address_t *)&x->id.daddr,
 					      spi, IPPROTO_IPV6, AF_INET6);
 	if (!t) {
 		t = ipcomp6_tunnel_create(x);
@@ -252,160 +146,9 @@ out:
 	return err;
 }
 
-static void ipcomp6_free_scratches(void)
-{
-	int i;
-	void **scratches;
-
-	if (--ipcomp6_scratch_users)
-		return;
-
-	scratches = ipcomp6_scratches;
-	if (!scratches)
-		return;
-
-	for_each_possible_cpu(i) {
-		void *scratch = *per_cpu_ptr(scratches, i);
-
-		vfree(scratch);
-	}
-
-	free_percpu(scratches);
-}
-
-static void **ipcomp6_alloc_scratches(void)
-{
-	int i;
-	void **scratches;
-
-	if (ipcomp6_scratch_users++)
-		return ipcomp6_scratches;
-
-	scratches = alloc_percpu(void *);
-	if (!scratches)
-		return NULL;
-
-	ipcomp6_scratches = scratches;
-
-	for_each_possible_cpu(i) {
-		void *scratch = vmalloc(IPCOMP_SCRATCH_SIZE);
-		if (!scratch)
-			return NULL;
-		*per_cpu_ptr(scratches, i) = scratch;
-	}
-
-	return scratches;
-}
-
-static void ipcomp6_free_tfms(struct crypto_comp **tfms)
-{
-	struct ipcomp6_tfms *pos;
-	int cpu;
-
-	list_for_each_entry(pos, &ipcomp6_tfms_list, list) {
-		if (pos->tfms == tfms)
-			break;
-	}
-
-	BUG_TRAP(pos);
-
-	if (--pos->users)
-		return;
-
-	list_del(&pos->list);
-	kfree(pos);
-
-	if (!tfms)
-		return;
-
-	for_each_possible_cpu(cpu) {
-		struct crypto_comp *tfm = *per_cpu_ptr(tfms, cpu);
-		crypto_free_comp(tfm);
-	}
-	free_percpu(tfms);
-}
-
-static struct crypto_comp **ipcomp6_alloc_tfms(const char *alg_name)
-{
-	struct ipcomp6_tfms *pos;
-	struct crypto_comp **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, &ipcomp6_tfms_list, list) {
-		struct crypto_comp *tfm;
-
-		tfms = pos->tfms;
-		tfm = *per_cpu_ptr(tfms, cpu);
-
-		if (!strcmp(crypto_comp_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, &ipcomp6_tfms_list);
-
-	pos->tfms = tfms = alloc_percpu(struct crypto_comp *);
-	if (!tfms)
-		goto error;
-
-	for_each_possible_cpu(cpu) {
-		struct crypto_comp *tfm = crypto_alloc_comp(alg_name, 0,
-							    CRYPTO_ALG_ASYNC);
-		if (IS_ERR(tfm))
-			goto error;
-		*per_cpu_ptr(tfms, cpu) = tfm;
-	}
-
-	return tfms;
-
-error:
-	ipcomp6_free_tfms(tfms);
-	return NULL;
-}
-
-static void ipcomp6_free_data(struct ipcomp_data *ipcd)
-{
-	if (ipcd->tfms)
-		ipcomp6_free_tfms(ipcd->tfms);
-	ipcomp6_free_scratches();
-}
-
-static void ipcomp6_destroy(struct xfrm_state *x)
-{
-	struct ipcomp_data *ipcd = x->data;
-	if (!ipcd)
-		return;
-	xfrm_state_delete_tunnel(x);
-	mutex_lock(&ipcomp6_resource_mutex);
-	ipcomp6_free_data(ipcd);
-	mutex_unlock(&ipcomp6_resource_mutex);
-	kfree(ipcd);
-
-	xfrm6_tunnel_free_spi((xfrm_address_t *)&x->props.saddr);
-}
-
 static int ipcomp6_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;
+	int err = -EINVAL;
 
 	x->props.header_len = 0;
 	switch (x->props.mode) {
@@ -418,41 +161,24 @@ static int ipcomp6_init_state(struct xfrm_state *x)
 		goto out;
 	}
 
-	err = -ENOMEM;
-	ipcd = kzalloc(sizeof(*ipcd), GFP_KERNEL);
-	if (!ipcd)
+	err = ipcomp_init_state(x);
+	if (err)
 		goto out;
 
-	mutex_lock(&ipcomp6_resource_mutex);
-	if (!ipcomp6_alloc_scratches())
-		goto error;
-
-	ipcd->tfms = ipcomp6_alloc_tfms(x->calg->alg_name);
-	if (!ipcd->tfms)
-		goto error;
-	mutex_unlock(&ipcomp6_resource_mutex);
-
 	if (x->props.mode == XFRM_MODE_TUNNEL) {
 		err = ipcomp6_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:
-	mutex_lock(&ipcomp6_resource_mutex);
-error:
-	ipcomp6_free_data(ipcd);
-	mutex_unlock(&ipcomp6_resource_mutex);
-	kfree(ipcd);
+}
 
-	goto out;
+static int ipcomp6_rcv_cb(struct sk_buff *skb, int err)
+{
+	return 0;
 }
 
 static const struct xfrm_type ipcomp6_type =
@@ -461,27 +187,28 @@ static const struct xfrm_type ipcomp6_type =
 	.owner		= THIS_MODULE,
 	.proto		= IPPROTO_COMP,
 	.init_state	= ipcomp6_init_state,
-	.destructor	= ipcomp6_destroy,
-	.input		= ipcomp6_input,
-	.output		= ipcomp6_output,
+	.destructor	= ipcomp_destroy,
+	.input		= ipcomp_input,
+	.output		= ipcomp_output,
 	.hdr_offset	= xfrm6_find_1stfragopt,
 };
 
-static struct inet6_protocol ipcomp6_protocol =
+static struct xfrm6_protocol ipcomp6_protocol =
 {
 	.handler	= xfrm6_rcv,
+	.cb_handler	= ipcomp6_rcv_cb,
 	.err_handler	= ipcomp6_err,
-	.flags		= INET6_PROTO_NOPOLICY,
+	.priority	= 0,
 };
 
 static int __init ipcomp6_init(void)
 {
 	if (xfrm_register_type(&ipcomp6_type, AF_INET6) < 0) {
-		printk(KERN_INFO "ipcomp6 init: can't add xfrm type\n");
+		pr_info("%s: can't add xfrm type\n", __func__);
 		return -EAGAIN;
 	}
-	if (inet6_add_protocol(&ipcomp6_protocol, IPPROTO_COMP) < 0) {
-		printk(KERN_INFO "ipcomp6 init: can't add protocol\n");
+	if (xfrm6_protocol_register(&ipcomp6_protocol, IPPROTO_COMP) < 0) {
+		pr_info("%s: can't add protocol\n", __func__);
 		xfrm_unregister_type(&ipcomp6_type, AF_INET6);
 		return -EAGAIN;
 	}
@@ -490,10 +217,10 @@ static int __init ipcomp6_init(void)
 
 static void __exit ipcomp6_fini(void)
 {
-	if (inet6_del_protocol(&ipcomp6_protocol, IPPROTO_COMP) < 0)
-		printk(KERN_INFO "ipv6 ipcomp close: can't remove protocol\n");
+	if (xfrm6_protocol_deregister(&ipcomp6_protocol, IPPROTO_COMP) < 0)
+		pr_info("%s: can't remove protocol\n", __func__);
 	if (xfrm_unregister_type(&ipcomp6_type, AF_INET6) < 0)
-		printk(KERN_INFO "ipv6 ipcomp close: can't remove xfrm type\n");
+		pr_info("%s: can't remove xfrm type\n", __func__);
 }
 
 module_init(ipcomp6_init);