#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/rtnetlink.h>
#include <net/ip.h>
#include <net/xfrm.h>
#include <net/icmp.h>
#include <net/ipcomp.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 = ipcd->scratch;
+ u8 *start, *scratch;
+ struct crypto_tfm *tfm;
+ int cpu;
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(ipcomp_scratches, cpu);
+ tfm = *per_cpu_ptr(ipcd->tfms, cpu);
+
+ err = crypto_comp_decompress(tfm, start, plen, scratch, &dlen);
if (err)
goto out;
iph = skb->nh.iph;
iph->tot_len = htons(dlen + iph->ihl * 4);
out:
+ put_cpu();
return err;
}
int err, plen, dlen, ihlen;
struct iphdr *iph = skb->nh.iph;
struct ipcomp_data *ipcd = x->data;
- u8 *start, *scratch = ipcd->scratch;
+ 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;
- err = crypto_comp_compress(ipcd->tfm, start, plen, scratch, &dlen);
+ 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;
}
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 sk_buff **pskb)
+static int ipcomp_output(struct sk_buff *skb)
{
int err;
- struct dst_entry *dst = (*pskb)->dst;
+ struct dst_entry *dst = skb->dst;
struct xfrm_state *x = dst->xfrm;
struct iphdr *iph;
struct ip_comp_hdr *ipch;
struct ipcomp_data *ipcd = x->data;
int hdr_len = 0;
- iph = (*pskb)->nh.iph;
- iph->tot_len = htons((*pskb)->len);
+ iph = skb->nh.iph;
+ iph->tot_len = htons(skb->len);
hdr_len = iph->ihl * 4;
- if (((*pskb)->len - hdr_len) < ipcd->threshold) {
+ if ((skb->len - hdr_len) < ipcd->threshold) {
/* Don't bother compressing */
if (x->props.mode) {
ip_send_check(iph);
goto out_ok;
}
- if ((skb_is_nonlinear(*pskb) || skb_cloned(*pskb)) &&
- skb_linearize(*pskb, GFP_ATOMIC) != 0) {
+ if ((skb_is_nonlinear(skb) || skb_cloned(skb)) &&
+ skb_linearize(skb, GFP_ATOMIC) != 0) {
err = -ENOMEM;
goto error;
}
- err = ipcomp_compress(x, *pskb);
+ err = ipcomp_compress(x, skb);
if (err) {
if (err == -EMSGSIZE) {
if (x->props.mode) {
- iph = (*pskb)->nh.iph;
+ iph = skb->nh.iph;
ip_send_check(iph);
}
goto out_ok;
}
/* Install ipcomp header, convert into ipcomp datagram. */
- iph = (*pskb)->nh.iph;
- iph->tot_len = htons((*pskb)->len);
+ iph = skb->nh.iph;
+ iph->tot_len = htons(skb->len);
ipch = (struct ip_comp_hdr *)((char *)iph + iph->ihl * 4);
ipch->nexthdr = iph->protocol;
ipch->flags = 0;
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)
+{
+ 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;
+
+ 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 **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 = 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->tfm)
- crypto_free_tfm(ipcd->tfm);
- if (ipcd->scratch)
- kfree(ipcd->scratch);
+ if (ipcd->tfms)
+ ipcomp_free_tfms(ipcd->tfms);
+ ipcomp_free_scratches();
}
static void ipcomp_destroy(struct xfrm_state *x)
if (!ipcd)
return;
xfrm_state_delete_tunnel(x);
+ down(&ipcomp_resource_sem);
ipcomp_free_data(ipcd);
+ up(&ipcomp_resource_sem);
kfree(ipcd);
}
if (!x->calg)
goto out;
+ if (x->encap)
+ goto out;
+
err = -ENOMEM;
ipcd = kmalloc(sizeof(*ipcd), GFP_KERNEL);
if (!ipcd)
- goto error;
+ goto out;
memset(ipcd, 0, sizeof(*ipcd));
x->props.header_len = 0;
if (x->props.mode)
x->props.header_len += sizeof(struct iphdr);
- ipcd->scratch = kmalloc(IPCOMP_SCRATCH_SIZE, GFP_KERNEL);
- if (!ipcd->scratch)
+ down(&ipcomp_resource_sem);
+ if (!ipcomp_alloc_scratches())
goto error;
-
- ipcd->tfm = crypto_alloc_tfm(x->calg->alg_name, 0);
- if (!ipcd->tfm)
+
+ ipcd->tfms = ipcomp_alloc_tfms(x->calg->alg_name);
+ if (!ipcd->tfms)
goto error;
+ up(&ipcomp_resource_sem);
if (x->props.mode) {
err = ipcomp_tunnel_attach(x);
if (err)
- goto error;
+ goto error_tunnel;
}
calg_desc = xfrm_calg_get_byname(x->calg->alg_name);
out:
return err;
+error_tunnel:
+ down(&ipcomp_resource_sem);
error:
- if (ipcd) {
- ipcomp_free_data(ipcd);
- kfree(ipcd);
- }
+ ipcomp_free_data(ipcd);
+ up(&ipcomp_resource_sem);
+ kfree(ipcd);
goto out;
}
git://git.onelab.eu / linux-2.6.git / blobdiff