mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-24 09:50:04 +00:00
![David S. Miller](/assets/img/avatar_default.png)
Conflicts: drivers/net/ethernet/emulex/benet/be.h drivers/net/netconsole.c net/bridge/br_private.h Three mostly trivial conflicts. The net/bridge/br_private.h conflict was a function signature (argument addition) change overlapping with the extern removals from Joe Perches. In drivers/net/netconsole.c we had one change adjusting a printk message whilst another changed "printk(KERN_INFO" into "pr_info(". Lastly, the emulex change was a new inline function addition overlapping with Joe Perches's extern removals. Signed-off-by: David S. Miller <davem@davemloft.net>
386 lines
7.6 KiB
C
386 lines
7.6 KiB
C
/*
|
|
* IP Payload Compression Protocol (IPComp) - RFC3173.
|
|
*
|
|
* Copyright (c) 2003 James Morris <jmorris@intercode.com.au>
|
|
* Copyright (c) 2003-2008 Herbert Xu <herbert@gondor.apana.org.au>
|
|
*
|
|
* 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.
|
|
*
|
|
* Todo:
|
|
* - Tunable compression parameters.
|
|
* - Compression stats.
|
|
* - Adaptive compression.
|
|
*/
|
|
|
|
#include <linux/crypto.h>
|
|
#include <linux/err.h>
|
|
#include <linux/list.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/percpu.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <net/ip.h>
|
|
#include <net/ipcomp.h>
|
|
#include <net/xfrm.h>
|
|
|
|
struct ipcomp_tfms {
|
|
struct list_head list;
|
|
struct crypto_comp * __percpu *tfms;
|
|
int users;
|
|
};
|
|
|
|
static DEFINE_MUTEX(ipcomp_resource_mutex);
|
|
static void * __percpu *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)
|
|
{
|
|
struct ipcomp_data *ipcd = x->data;
|
|
const int plen = skb->len;
|
|
int dlen = IPCOMP_SCRATCH_SIZE;
|
|
const u8 *start = skb->data;
|
|
const int cpu = get_cpu();
|
|
u8 *scratch = *per_cpu_ptr(ipcomp_scratches, cpu);
|
|
struct crypto_comp *tfm = *per_cpu_ptr(ipcd->tfms, cpu);
|
|
int err = crypto_comp_decompress(tfm, start, plen, scratch, &dlen);
|
|
int len;
|
|
|
|
if (err)
|
|
goto out;
|
|
|
|
if (dlen < (plen + sizeof(struct ip_comp_hdr))) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
len = dlen - plen;
|
|
if (len > skb_tailroom(skb))
|
|
len = skb_tailroom(skb);
|
|
|
|
__skb_put(skb, len);
|
|
|
|
len += plen;
|
|
skb_copy_to_linear_data(skb, scratch, len);
|
|
|
|
while ((scratch += len, dlen -= len) > 0) {
|
|
skb_frag_t *frag;
|
|
struct page *page;
|
|
|
|
err = -EMSGSIZE;
|
|
if (WARN_ON(skb_shinfo(skb)->nr_frags >= MAX_SKB_FRAGS))
|
|
goto out;
|
|
|
|
frag = skb_shinfo(skb)->frags + skb_shinfo(skb)->nr_frags;
|
|
page = alloc_page(GFP_ATOMIC);
|
|
|
|
err = -ENOMEM;
|
|
if (!page)
|
|
goto out;
|
|
|
|
__skb_frag_set_page(frag, page);
|
|
|
|
len = PAGE_SIZE;
|
|
if (dlen < len)
|
|
len = dlen;
|
|
|
|
frag->page_offset = 0;
|
|
skb_frag_size_set(frag, len);
|
|
memcpy(skb_frag_address(frag), scratch, len);
|
|
|
|
skb->truesize += len;
|
|
skb->data_len += len;
|
|
skb->len += len;
|
|
|
|
skb_shinfo(skb)->nr_frags++;
|
|
}
|
|
|
|
err = 0;
|
|
|
|
out:
|
|
put_cpu();
|
|
return err;
|
|
}
|
|
|
|
int ipcomp_input(struct xfrm_state *x, struct sk_buff *skb)
|
|
{
|
|
int nexthdr;
|
|
int err = -ENOMEM;
|
|
struct ip_comp_hdr *ipch;
|
|
|
|
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));
|
|
err = ipcomp_decompress(x, skb);
|
|
if (err)
|
|
goto out;
|
|
|
|
err = nexthdr;
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ipcomp_input);
|
|
|
|
static int ipcomp_compress(struct xfrm_state *x, struct sk_buff *skb)
|
|
{
|
|
struct ipcomp_data *ipcd = x->data;
|
|
const int plen = skb->len;
|
|
int dlen = IPCOMP_SCRATCH_SIZE;
|
|
u8 *start = skb->data;
|
|
struct crypto_comp *tfm;
|
|
u8 *scratch;
|
|
int err;
|
|
|
|
local_bh_disable();
|
|
scratch = *this_cpu_ptr(ipcomp_scratches);
|
|
tfm = *this_cpu_ptr(ipcd->tfms);
|
|
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);
|
|
local_bh_enable();
|
|
|
|
pskb_trim(skb, dlen + sizeof(struct ip_comp_hdr));
|
|
return 0;
|
|
|
|
out:
|
|
local_bh_enable();
|
|
return err;
|
|
}
|
|
|
|
int ipcomp_output(struct xfrm_state *x, struct sk_buff *skb)
|
|
{
|
|
int err;
|
|
struct ip_comp_hdr *ipch;
|
|
struct ipcomp_data *ipcd = x->data;
|
|
|
|
if (skb->len < ipcd->threshold) {
|
|
/* Don't bother compressing */
|
|
goto out_ok;
|
|
}
|
|
|
|
if (skb_linearize_cow(skb))
|
|
goto out_ok;
|
|
|
|
err = ipcomp_compress(x, skb);
|
|
|
|
if (err) {
|
|
goto out_ok;
|
|
}
|
|
|
|
/* Install ipcomp header, convert into ipcomp 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;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ipcomp_output);
|
|
|
|
static void ipcomp_free_scratches(void)
|
|
{
|
|
int i;
|
|
void * __percpu *scratches;
|
|
|
|
if (--ipcomp_scratch_users)
|
|
return;
|
|
|
|
scratches = ipcomp_scratches;
|
|
if (!scratches)
|
|
return;
|
|
|
|
for_each_possible_cpu(i)
|
|
vfree(*per_cpu_ptr(scratches, i));
|
|
|
|
free_percpu(scratches);
|
|
}
|
|
|
|
static void * __percpu *ipcomp_alloc_scratches(void)
|
|
{
|
|
void * __percpu *scratches;
|
|
int i;
|
|
|
|
if (ipcomp_scratch_users++)
|
|
return ipcomp_scratches;
|
|
|
|
scratches = alloc_percpu(void *);
|
|
if (!scratches)
|
|
return NULL;
|
|
|
|
ipcomp_scratches = scratches;
|
|
|
|
for_each_possible_cpu(i) {
|
|
void *scratch;
|
|
|
|
scratch = vmalloc_node(IPCOMP_SCRATCH_SIZE, cpu_to_node(i));
|
|
if (!scratch)
|
|
return NULL;
|
|
*per_cpu_ptr(scratches, i) = scratch;
|
|
}
|
|
|
|
return scratches;
|
|
}
|
|
|
|
static void ipcomp_free_tfms(struct crypto_comp * __percpu *tfms)
|
|
{
|
|
struct ipcomp_tfms *pos;
|
|
int cpu;
|
|
|
|
list_for_each_entry(pos, &ipcomp_tfms_list, list) {
|
|
if (pos->tfms == tfms)
|
|
break;
|
|
}
|
|
|
|
WARN_ON(!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 * __percpu *ipcomp_alloc_tfms(const char *alg_name)
|
|
{
|
|
struct ipcomp_tfms *pos;
|
|
struct crypto_comp * __percpu *tfms;
|
|
int cpu;
|
|
|
|
|
|
list_for_each_entry(pos, &ipcomp_tfms_list, list) {
|
|
struct crypto_comp *tfm;
|
|
|
|
/* This can be any valid CPU ID so we don't need locking. */
|
|
tfm = __this_cpu_read(*pos->tfms);
|
|
|
|
if (!strcmp(crypto_comp_name(tfm), alg_name)) {
|
|
pos->users++;
|
|
return pos->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_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:
|
|
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();
|
|
}
|
|
|
|
void ipcomp_destroy(struct xfrm_state *x)
|
|
{
|
|
struct ipcomp_data *ipcd = x->data;
|
|
if (!ipcd)
|
|
return;
|
|
xfrm_state_delete_tunnel(x);
|
|
mutex_lock(&ipcomp_resource_mutex);
|
|
ipcomp_free_data(ipcd);
|
|
mutex_unlock(&ipcomp_resource_mutex);
|
|
kfree(ipcd);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ipcomp_destroy);
|
|
|
|
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 = kzalloc(sizeof(*ipcd), GFP_KERNEL);
|
|
if (!ipcd)
|
|
goto out;
|
|
|
|
mutex_lock(&ipcomp_resource_mutex);
|
|
if (!ipcomp_alloc_scratches())
|
|
goto error;
|
|
|
|
ipcd->tfms = ipcomp_alloc_tfms(x->calg->alg_name);
|
|
if (!ipcd->tfms)
|
|
goto error;
|
|
mutex_unlock(&ipcomp_resource_mutex);
|
|
|
|
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:
|
|
ipcomp_free_data(ipcd);
|
|
mutex_unlock(&ipcomp_resource_mutex);
|
|
kfree(ipcd);
|
|
goto out;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ipcomp_init_state);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("IP Payload Compression Protocol (IPComp) - RFC3173");
|
|
MODULE_AUTHOR("James Morris <jmorris@intercode.com.au>");
|