* The decompression of IP datagram MUST be done after the reassembly,
* AH/ESP processing.
*/
-#include <linux/config.h>
#include <linux/module.h>
-#include <net/inet_ecn.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 <net/protocol.h>
#include <linux/ipv6.h>
#include <linux/icmpv6.h>
+#include <linux/mutex.h>
-static int ipcomp6_input(struct xfrm_state *x, struct xfrm_decap_state *decap, struct sk_buff *skb)
+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 err = 0;
- u8 nexthdr = 0;
- u8 *prevhdr;
- int hdr_len = skb->h.raw - skb->nh.raw;
- unsigned char *tmp_hdr = NULL;
+ int err = -ENOMEM;
struct ipv6hdr *iph;
+ struct ipv6_comp_hdr *ipch;
int plen, dlen;
struct ipcomp_data *ipcd = x->data;
- u8 *start, *scratch = ipcd->scratch;
+ u8 *start, *scratch;
+ struct crypto_comp *tfm;
+ int cpu;
- if ((skb_is_nonlinear(skb) || skb_cloned(skb)) &&
- skb_linearize(skb, GFP_ATOMIC) != 0) {
- err = -ENOMEM;
+ if (skb_linearize_cow(skb))
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;
+ ipch = (void *)skb->data;
+ skb->h.raw = skb->nh.raw + sizeof(*ipch);
+ __skb_pull(skb, sizeof(*ipch));
/* decompression */
plen = skb->len;
dlen = IPCOMP_SCRATCH_SIZE;
start = skb->data;
- err = crypto_comp_decompress(ipcd->tfm, start, plen, scratch, &dlen);
+ 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;
+ goto out_put_cpu;
}
if (dlen < (plen + sizeof(struct ipv6_comp_hdr))) {
err = -EINVAL;
- goto out;
+ goto out_put_cpu;
}
err = pskb_expand_head(skb, 0, dlen - plen, GFP_ATOMIC);
if (err) {
- goto out;
+ goto out_put_cpu;
}
- skb_put(skb, dlen - plen);
+ skb->truesize += dlen - plen;
+ __skb_put(skb, dlen - plen);
memcpy(skb->data, scratch, dlen);
+ err = ipch->nexthdr;
- iph = skb->nh.ipv6h;
- iph->payload_len = htons(skb->len);
-
- ip6_find_1stfragopt(skb, &prevhdr);
- *prevhdr = nexthdr;
+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 sk_buff **pskb)
+static int ipcomp6_output(struct xfrm_state *x, struct sk_buff *skb)
{
int err;
- struct dst_entry *dst = (*pskb)->dst;
- struct xfrm_state *x = dst->xfrm;
- struct ipv6hdr *tmp_iph = NULL, *iph, *top_iph;
- int hdr_len = 0;
+ struct ipv6hdr *top_iph;
+ int hdr_len;
struct ipv6_comp_hdr *ipch;
struct ipcomp_data *ipcd = x->data;
- u8 *prevhdr;
- u8 nexthdr = 0;
int plen, dlen;
- u8 *start, *scratch = ipcd->scratch;
+ u8 *start, *scratch;
+ struct crypto_comp *tfm;
+ int cpu;
- if ((*pskb)->ip_summed == CHECKSUM_HW) {
- err = skb_checksum_help(pskb, 0);
- if (err)
- goto error_nolock;
- }
-
- spin_lock_bh(&x->lock);
-
- err = xfrm_check_output(x, *pskb, AF_INET6);
- if (err)
- goto error;
-
- if (x->props.mode) {
- hdr_len = sizeof(struct ipv6hdr);
- nexthdr = IPPROTO_IPV6;
- iph = (*pskb)->nh.ipv6h;
- top_iph = (struct ipv6hdr *)skb_push(*pskb, sizeof(struct ipv6hdr));
- top_iph->version = 6;
- top_iph->priority = iph->priority;
- top_iph->flow_lbl[0] = iph->flow_lbl[0];
- top_iph->flow_lbl[1] = iph->flow_lbl[1];
- top_iph->flow_lbl[2] = iph->flow_lbl[2];
- top_iph->nexthdr = IPPROTO_IPV6; /* initial */
- top_iph->payload_len = htons((*pskb)->len - sizeof(struct ipv6hdr));
- top_iph->hop_limit = iph->hop_limit;
- memcpy(&top_iph->saddr, (struct in6_addr *)&x->props.saddr, sizeof(struct in6_addr));
- memcpy(&top_iph->daddr, (struct in6_addr *)&x->id.daddr, sizeof(struct in6_addr));
- (*pskb)->nh.raw = (*pskb)->data; /* == top_iph */
- (*pskb)->h.raw = (*pskb)->nh.raw + hdr_len;
- } else {
- hdr_len = ip6_find_1stfragopt(*pskb, &prevhdr);
- nexthdr = *prevhdr;
- }
+ hdr_len = skb->h.raw - skb->data;
/* check whether datagram len is larger than threshold */
- if (((*pskb)->len - hdr_len) < ipcd->threshold) {
+ if ((skb->len - hdr_len) < ipcd->threshold) {
goto out_ok;
}
- if ((skb_is_nonlinear(*pskb) || skb_cloned(*pskb)) &&
- skb_linearize(*pskb, GFP_ATOMIC) != 0) {
- err = -ENOMEM;
- goto error;
- }
+ if (skb_linearize_cow(skb))
+ goto out_ok;
/* compression */
- plen = (*pskb)->len - hdr_len;
+ plen = skb->len - hdr_len;
dlen = IPCOMP_SCRATCH_SIZE;
- start = (*pskb)->data + hdr_len;
+ start = skb->h.raw;
- err = crypto_comp_compress(ipcd->tfm, start, plen, scratch, &dlen);
- if (err) {
- goto error;
- }
- if ((dlen + sizeof(struct ipv6_comp_hdr)) >= plen) {
+ 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, scratch, dlen);
- pskb_trim(*pskb, hdr_len+dlen);
+ 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 */
- tmp_iph = kmalloc(hdr_len, GFP_ATOMIC);
- if (!tmp_iph) {
- err = -ENOMEM;
- goto error;
- }
- memcpy(tmp_iph, (*pskb)->nh.raw, hdr_len);
- top_iph = (struct ipv6hdr*)skb_push(*pskb, sizeof(struct ipv6_comp_hdr));
- memcpy(top_iph, tmp_iph, hdr_len);
- kfree(tmp_iph);
-
- if (x->props.mode && (x->props.flags & XFRM_STATE_NOECN))
- IP6_ECN_clear(top_iph);
- top_iph->payload_len = htons((*pskb)->len - sizeof(struct ipv6hdr));
- (*pskb)->nh.raw = (*pskb)->data; /* top_iph */
- ip6_find_1stfragopt(*pskb, &prevhdr);
- *prevhdr = IPPROTO_COMP;
-
- ipch = (struct ipv6_comp_hdr *)((unsigned char *)top_iph + hdr_len);
- ipch->nexthdr = nexthdr;
+ 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;
- (*pskb)->h.raw = (unsigned char*)ipch;
out_ok:
- x->curlft.bytes += (*pskb)->len;
- x->curlft.packets++;
- spin_unlock_bh(&x->lock);
-
- if (((*pskb)->dst = dst_pop(dst)) == NULL) {
- err = -EHOSTUNREACH;
- goto error_nolock;
- }
- err = NET_XMIT_BYPASS;
-
-out_exit:
- return err;
-error:
- spin_unlock_bh(&x->lock);
-error_nolock:
- kfree_skb(*pskb);
- goto out_exit;
+ return 0;
}
static void ipcomp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
- int type, int code, int offset, __u32 info)
+ int type, int code, int offset, __be32 info)
{
- u32 spi;
+ __be32 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)
+ if (type != ICMPV6_DEST_UNREACH && type != ICMPV6_PKT_TOOBIG)
return;
- spi = ntohl(ntohs(ipcomph->cpi));
+ spi = htonl(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",
+ printk(KERN_DEBUG "pmtu discovery on SA IPCOMP/%08x/" NIP6_FMT "\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;
+ u8 mode = XFRM_MODE_TUNNEL;
+
+ 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);
+ if (!t->id.spi)
+ goto error;
+
+ 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;
+ if (x->props.mode == XFRM_MODE_BEET)
+ mode = x->props.mode;
+ t->props.mode = mode;
+ memcpy(t->props.saddr.a6, x->props.saddr.a6, sizeof(struct in6_addr));
+
+ if (xfrm_init_state(t))
+ goto error;
+
+ atomic_set(&t->tunnel_users, 1);
+
+out:
+ return t;
+
+error:
+ t->km.state = XFRM_STATE_DEAD;
+ xfrm_state_put(t);
+ t = NULL;
+ goto out;
+}
+
+static int ipcomp6_tunnel_attach(struct xfrm_state *x)
+{
+ int err = 0;
+ struct xfrm_state *t = NULL;
+ __be32 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_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 (!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->tfm)
- crypto_free_tfm(ipcd->tfm);
- if (ipcd->scratch)
- kfree(ipcd->scratch);
+ 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, void *args)
+static int ipcomp6_init_state(struct xfrm_state *x)
{
int err;
struct ipcomp_data *ipcd;
if (!x->calg)
goto out;
+ if (x->encap)
+ goto out;
+
err = -ENOMEM;
- ipcd = kmalloc(sizeof(*ipcd), GFP_KERNEL);
+ ipcd = kzalloc(sizeof(*ipcd), GFP_KERNEL);
if (!ipcd)
- goto error;
+ goto out;
- memset(ipcd, 0, sizeof(*ipcd));
- x->props.header_len = sizeof(struct ipv6_comp_hdr);
- if (x->props.mode)
+ x->props.header_len = 0;
+ if (x->props.mode == XFRM_MODE_TUNNEL)
x->props.header_len += sizeof(struct ipv6hdr);
- ipcd->scratch = kmalloc(IPCOMP_SCRATCH_SIZE, GFP_KERNEL);
- if (!ipcd->scratch)
+ mutex_lock(&ipcomp6_resource_mutex);
+ if (!ipcomp6_alloc_scratches())
goto error;
- ipcd->tfm = crypto_alloc_tfm(x->calg->alg_name, 0);
- if (!ipcd->tfm)
+ 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;
+ }
- calg_desc = xfrm_calg_get_byname(x->calg->alg_name);
+ 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:
- if (ipcd) {
- ipcomp6_free_data(ipcd);
- kfree(ipcd);
- }
+ ipcomp6_free_data(ipcd);
+ mutex_unlock(&ipcomp6_resource_mutex);
+ kfree(ipcd);
goto out;
}
.destructor = ipcomp6_destroy,
.input = ipcomp6_input,
.output = ipcomp6_output,
+ .hdr_offset = xfrm6_find_1stfragopt,
};
static struct inet6_protocol ipcomp6_protocol =
git://git.onelab.eu / linux-2.6.git / blobdiff