1 files changed, 524 insertions, 0 deletions

diff --git a/net/ipv6/ipcomp6.c b/net/ipv6/ipcomp6.c
new file mode 100644
index 000000000000..6cde5310cd76
--- /dev/null
+++ b/net/ipv6/ipcomp6.c
@@ -0,0 +1,524 @@
+/*
+ * IP Payload Compression Protocol (IPComp) for IPv6 - RFC3173
+ *
+ * Copyright (C)2003 USAGI/WIDE Project
+ *
+ * Author       Mitsuru KANDA  <mk@linux-ipv6.org>
+ *
+ * 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) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * 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
+ */
+/* 
+ * [Memo]
+ *
+ * Outbound:
+ *  The compression of IP datagram MUST be done before AH/ESP processing, 
+ *  fragmentation, and the addition of Hop-by-Hop/Routing header. 
+ *
+ * Inbound:
+ *  The decompression of IP datagram MUST be done after the reassembly, 
+ *  AH/ESP processing.
+ */
+#include <linux/config.h>
+#include <linux/module.h>
+#include <net/ip.h>
+#include <net/xfrm.h>
+#include <net/ipcomp.h>
+#include <asm/scatterlist.h>
+#include <asm/semaphore.h>
+#include <linux/crypto.h>
+#include <linux/pfkeyv2.h>
+#include <linux/random.h>
+#include <linux/percpu.h>
+#include <linux/smp.h>
+#include <linux/list.h>
+#include <linux/vmalloc.h>
+#include <linux/rtnetlink.h>
+#include <net/icmp.h>
+#include <net/ipv6.h>
+#include <linux/ipv6.h>
+#include <linux/icmpv6.h>
+
+struct ipcomp6_tfms {
+        struct list_head list;
+        struct crypto_tfm **tfms;
+        int users;
+};
+
+static DECLARE_MUTEX(ipcomp6_resource_sem);
+static void **ipcomp6_scratches;
+static int ipcomp6_scratch_users;
+static LIST_HEAD(ipcomp6_tfms_list);
+
+static int ipcomp6_input(struct xfrm_state *x, struct xfrm_decap_state *decap, struct sk_buff *skb)
+{
+        int err = 0;
+        u8 nexthdr = 0;
+        int hdr_len = skb->h.raw - skb->nh.raw;
+        unsigned char *tmp_hdr = NULL;
+        struct ipv6hdr *iph;
+        int plen, dlen;
+        struct ipcomp_data *ipcd = x->data;
+        u8 *start, *scratch;
+        struct crypto_tfm *tfm;
+        int cpu;
+
+        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.ipv6h;
+        tmp_hdr = kmalloc(hdr_len, GFP_ATOMIC);
+        if (!tmp_hdr)
+                goto out;
+        memcpy(tmp_hdr, iph, hdr_len);
+        nexthdr = *(u8 *)skb->data;
+        skb_pull(skb, sizeof(struct ipv6_comp_hdr)); 
+        skb->nh.raw += sizeof(struct ipv6_comp_hdr);
+        memcpy(skb->nh.raw, tmp_hdr, hdr_len);
+        iph = skb->nh.ipv6h;
+        iph->payload_len = htons(ntohs(iph->payload_len) - sizeof(struct ipv6_comp_hdr));
+        skb->h.raw = skb->data;
+
+        /* 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) {
+                err = -EINVAL;
+                goto out_put_cpu;
+        }
+
+        if (dlen < (plen + sizeof(struct ipv6_comp_hdr))) {
+                err = -EINVAL;
+                goto out_put_cpu;
+        }
+
+        err = pskb_expand_head(skb, 0, dlen - plen, GFP_ATOMIC);
+        if (err) {
+                goto out_put_cpu;
+        }
+
+        skb_put(skb, dlen - plen);
+        memcpy(skb->data, scratch, dlen);
+
+        iph = skb->nh.ipv6h;
+        iph->payload_len = htons(skb->len);
+        
+out_put_cpu:
+        put_cpu();
+out:
+        if (tmp_hdr)
+                kfree(tmp_hdr);
+        if (err)
+                goto error_out;
+        return nexthdr;
+error_out:
+        return err;
+}
+
+static int ipcomp6_output(struct xfrm_state *x, struct sk_buff *skb)
+{
+        int err;
+        struct ipv6hdr *top_iph;
+        int hdr_len;
+        struct ipv6_comp_hdr *ipch;
+        struct ipcomp_data *ipcd = x->data;
+        int plen, dlen;
+        u8 *start, *scratch;
+        struct crypto_tfm *tfm;
+        int cpu;
+
+        hdr_len = skb->h.raw - skb->data;
+
+        /* check whether datagram len is larger than threshold */
+        if ((skb->len - hdr_len) < ipcd->threshold) {
+                goto out_ok;
+        }
+
+        if ((skb_is_nonlinear(skb) || skb_cloned(skb)) &&
+                skb_linearize(skb, GFP_ATOMIC) != 0) {
+                goto out_ok;
+        }
+
+        /* compression */
+        plen = skb->len - hdr_len;
+        dlen = IPCOMP_SCRATCH_SIZE;
+        start = skb->h.raw;
+
+        cpu = get_cpu();
+        scratch = *per_cpu_ptr(ipcomp6_scratches, cpu);
+        tfm = *per_cpu_ptr(ipcd->tfms, cpu);
+
+        err = crypto_comp_compress(tfm, start, plen, scratch, &dlen);
+        if (err || (dlen + sizeof(struct ipv6_comp_hdr)) >= plen) {
+                put_cpu();
+                goto out_ok;
+        }
+        memcpy(start + sizeof(struct ip_comp_hdr), scratch, dlen);
+        put_cpu();
+        pskb_trim(skb, hdr_len + dlen + sizeof(struct ip_comp_hdr));
+
+        /* insert ipcomp header and replace datagram */
+        top_iph = (struct ipv6hdr *)skb->data;
+
+        top_iph->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
+
+        ipch = (struct ipv6_comp_hdr *)start;
+        ipch->nexthdr = *skb->nh.raw;
+        ipch->flags = 0;
+        ipch->cpi = htons((u16 )ntohl(x->id.spi));
+        *skb->nh.raw = IPPROTO_COMP;
+
+out_ok:
+        return 0;
+}
+
+static void ipcomp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
+                                int type, int code, int offset, __u32 info)
+{
+        u32 spi;
+        struct ipv6hdr *iph = (struct ipv6hdr*)skb->data;
+        struct ipv6_comp_hdr *ipcomph = (struct ipv6_comp_hdr*)(skb->data+offset);
+        struct xfrm_state *x;
+
+        if (type != ICMPV6_DEST_UNREACH && type != ICMPV6_PKT_TOOBIG)
+                return;
+
+        spi = ntohl(ntohs(ipcomph->cpi));
+        x = xfrm_state_lookup((xfrm_address_t *)&iph->daddr, spi, IPPROTO_COMP, AF_INET6);
+        if (!x)
+                return;
+
+        printk(KERN_DEBUG "pmtu discovery on SA IPCOMP/%08x/"
+                        "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
+                        spi, NIP6(iph->daddr));
+        xfrm_state_put(x);
+}
+
+static struct xfrm_state *ipcomp6_tunnel_create(struct xfrm_state *x)
+{
+        struct xfrm_state *t = NULL;
+
+        t = xfrm_state_alloc();
+        if (!t)
+                goto out;
+
+        t->id.proto = IPPROTO_IPV6;
+        t->id.spi = xfrm6_tunnel_alloc_spi((xfrm_address_t *)&x->props.saddr);
+        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;
+        memcpy(t->props.saddr.a6, x->props.saddr.a6, sizeof(struct in6_addr));
+
+        t->type = xfrm_get_type(IPPROTO_IPV6, t->props.family);
+        if (t->type == NULL)
+                goto error;
+
+        if (t->type->init_state(t, NULL))
+                goto error;
+
+        t->km.state = XFRM_STATE_VALID;
+        atomic_set(&t->tunnel_users, 1);
+
+out:
+        return t;
+
+error:
+        xfrm_state_put(t);
+        goto out;
+}
+
+static int ipcomp6_tunnel_attach(struct xfrm_state *x)
+{
+        int err = 0;
+        struct xfrm_state *t = NULL;
+        u32 spi;
+
+        spi = xfrm6_tunnel_spi_lookup((xfrm_address_t *)&x->props.saddr);
+        if (spi)
+                t = xfrm_state_lookup((xfrm_address_t *)&x->id.daddr,
+                                              spi, IPPROTO_IPV6, AF_INET6);
+        if (!t) {
+                t = ipcomp6_tunnel_create(x);
+                if (!t) {
+                        err = -EINVAL;
+                        goto out;
+                }
+                xfrm_state_insert(t);
+                xfrm_state_hold(t);
+        }
+        x->tunnel = t;
+        atomic_inc(&t->tunnel_users);
+
+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_cpu(i) {
+                void *scratch = *per_cpu_ptr(scratches, i);
+                if (scratch)
+                        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_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_tfm **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_cpu(cpu) {
+                struct crypto_tfm *tfm = *per_cpu_ptr(tfms, cpu);
+                if (tfm)
+                        crypto_free_tfm(tfm);
+        }
+        free_percpu(tfms);
+}
+
+static struct crypto_tfm **ipcomp6_alloc_tfms(const char *alg_name)
+{
+        struct ipcomp6_tfms *pos;
+        struct crypto_tfm **tfms;
+        int cpu;
+
+        /* This can be any valid CPU ID so we don't need locking. */
+        cpu = smp_processor_id();
+
+        list_for_each_entry(pos, &ipcomp6_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, &ipcomp6_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:
+        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);
+        down(&ipcomp6_resource_sem);
+        ipcomp6_free_data(ipcd);
+        up(&ipcomp6_resource_sem);
+        kfree(ipcd);
+
+        xfrm6_tunnel_free_spi((xfrm_address_t *)&x->props.saddr);
+}
+
+static int ipcomp6_init_state(struct xfrm_state *x, void *args)
+{
+        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)
+                x->props.header_len += sizeof(struct ipv6hdr);
+        
+        down(&ipcomp6_resource_sem);
+        if (!ipcomp6_alloc_scratches())
+                goto error;
+
+        ipcd->tfms = ipcomp6_alloc_tfms(x->calg->alg_name);
+        if (!ipcd->tfms)
+                goto error;
+        up(&ipcomp6_resource_sem);
+
+        if (x->props.mode) {
+                err = ipcomp6_tunnel_attach(x);
+                if (err)
+                        goto error_tunnel;
+        }
+
+        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(&ipcomp6_resource_sem);
+error:
+        ipcomp6_free_data(ipcd);
+        up(&ipcomp6_resource_sem);
+        kfree(ipcd);
+
+        goto out;
+}
+
+static struct xfrm_type ipcomp6_type = 
+{
+        .description    = "IPCOMP6",
+        .owner          = THIS_MODULE,
+        .proto          = IPPROTO_COMP,
+        .init_state     = ipcomp6_init_state,
+        .destructor     = ipcomp6_destroy,
+        .input          = ipcomp6_input,
+        .output         = ipcomp6_output,
+};
+
+static struct inet6_protocol ipcomp6_protocol = 
+{
+        .handler        = xfrm6_rcv,
+        .err_handler    = ipcomp6_err,
+        .flags          = INET6_PROTO_NOPOLICY,
+};
+
+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");
+                return -EAGAIN;
+        }
+        if (inet6_add_protocol(&ipcomp6_protocol, IPPROTO_COMP) < 0) {
+                printk(KERN_INFO "ipcomp6 init: can't add protocol\n");
+                xfrm_unregister_type(&ipcomp6_type, AF_INET6);
+                return -EAGAIN;
+        }
+        return 0;
+}
+
+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 (xfrm_unregister_type(&ipcomp6_type, AF_INET6) < 0)
+                printk(KERN_INFO "ipv6 ipcomp close: can't remove xfrm type\n");
+}
+
+module_init(ipcomp6_init);
+module_exit(ipcomp6_fini);
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("IP Payload Compression Protocol (IPComp) for IPv6 - RFC3173");
+MODULE_AUTHOR("Mitsuru KANDA <mk@linux-ipv6.org>");
+
+