mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 05:56:39 +07:00
36ae0148db
As it is, the replay check is just performed if the replay window of the legacy implementation is nonzero. So we move the test on a nonzero replay window inside the replay check functions to be sure we are testing for the right implementation. Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Acked-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
287 lines
6.1 KiB
C
287 lines
6.1 KiB
C
/*
|
|
* xfrm_input.c
|
|
*
|
|
* Changes:
|
|
* YOSHIFUJI Hideaki @USAGI
|
|
* Split up af-specific portion
|
|
*
|
|
*/
|
|
|
|
#include <linux/slab.h>
|
|
#include <linux/module.h>
|
|
#include <linux/netdevice.h>
|
|
#include <net/dst.h>
|
|
#include <net/ip.h>
|
|
#include <net/xfrm.h>
|
|
|
|
static struct kmem_cache *secpath_cachep __read_mostly;
|
|
|
|
void __secpath_destroy(struct sec_path *sp)
|
|
{
|
|
int i;
|
|
for (i = 0; i < sp->len; i++)
|
|
xfrm_state_put(sp->xvec[i]);
|
|
kmem_cache_free(secpath_cachep, sp);
|
|
}
|
|
EXPORT_SYMBOL(__secpath_destroy);
|
|
|
|
struct sec_path *secpath_dup(struct sec_path *src)
|
|
{
|
|
struct sec_path *sp;
|
|
|
|
sp = kmem_cache_alloc(secpath_cachep, GFP_ATOMIC);
|
|
if (!sp)
|
|
return NULL;
|
|
|
|
sp->len = 0;
|
|
if (src) {
|
|
int i;
|
|
|
|
memcpy(sp, src, sizeof(*sp));
|
|
for (i = 0; i < sp->len; i++)
|
|
xfrm_state_hold(sp->xvec[i]);
|
|
}
|
|
atomic_set(&sp->refcnt, 1);
|
|
return sp;
|
|
}
|
|
EXPORT_SYMBOL(secpath_dup);
|
|
|
|
/* Fetch spi and seq from ipsec header */
|
|
|
|
int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq)
|
|
{
|
|
int offset, offset_seq;
|
|
int hlen;
|
|
|
|
switch (nexthdr) {
|
|
case IPPROTO_AH:
|
|
hlen = sizeof(struct ip_auth_hdr);
|
|
offset = offsetof(struct ip_auth_hdr, spi);
|
|
offset_seq = offsetof(struct ip_auth_hdr, seq_no);
|
|
break;
|
|
case IPPROTO_ESP:
|
|
hlen = sizeof(struct ip_esp_hdr);
|
|
offset = offsetof(struct ip_esp_hdr, spi);
|
|
offset_seq = offsetof(struct ip_esp_hdr, seq_no);
|
|
break;
|
|
case IPPROTO_COMP:
|
|
if (!pskb_may_pull(skb, sizeof(struct ip_comp_hdr)))
|
|
return -EINVAL;
|
|
*spi = htonl(ntohs(*(__be16*)(skb_transport_header(skb) + 2)));
|
|
*seq = 0;
|
|
return 0;
|
|
default:
|
|
return 1;
|
|
}
|
|
|
|
if (!pskb_may_pull(skb, hlen))
|
|
return -EINVAL;
|
|
|
|
*spi = *(__be32*)(skb_transport_header(skb) + offset);
|
|
*seq = *(__be32*)(skb_transport_header(skb) + offset_seq);
|
|
return 0;
|
|
}
|
|
|
|
int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb)
|
|
{
|
|
struct xfrm_mode *inner_mode = x->inner_mode;
|
|
int err;
|
|
|
|
err = x->outer_mode->afinfo->extract_input(x, skb);
|
|
if (err)
|
|
return err;
|
|
|
|
if (x->sel.family == AF_UNSPEC) {
|
|
inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
|
|
if (inner_mode == NULL)
|
|
return -EAFNOSUPPORT;
|
|
}
|
|
|
|
skb->protocol = inner_mode->afinfo->eth_proto;
|
|
return inner_mode->input2(x, skb);
|
|
}
|
|
EXPORT_SYMBOL(xfrm_prepare_input);
|
|
|
|
int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
|
|
{
|
|
struct net *net = dev_net(skb->dev);
|
|
int err;
|
|
__be32 seq;
|
|
__be32 seq_hi;
|
|
struct xfrm_state *x;
|
|
xfrm_address_t *daddr;
|
|
struct xfrm_mode *inner_mode;
|
|
unsigned int family;
|
|
int decaps = 0;
|
|
int async = 0;
|
|
|
|
/* A negative encap_type indicates async resumption. */
|
|
if (encap_type < 0) {
|
|
async = 1;
|
|
x = xfrm_input_state(skb);
|
|
seq = XFRM_SKB_CB(skb)->seq.input.low;
|
|
goto resume;
|
|
}
|
|
|
|
/* Allocate new secpath or COW existing one. */
|
|
if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) {
|
|
struct sec_path *sp;
|
|
|
|
sp = secpath_dup(skb->sp);
|
|
if (!sp) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
|
|
goto drop;
|
|
}
|
|
if (skb->sp)
|
|
secpath_put(skb->sp);
|
|
skb->sp = sp;
|
|
}
|
|
|
|
daddr = (xfrm_address_t *)(skb_network_header(skb) +
|
|
XFRM_SPI_SKB_CB(skb)->daddroff);
|
|
family = XFRM_SPI_SKB_CB(skb)->family;
|
|
|
|
seq = 0;
|
|
if (!spi && (err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
|
|
goto drop;
|
|
}
|
|
|
|
do {
|
|
if (skb->sp->len == XFRM_MAX_DEPTH) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
|
|
goto drop;
|
|
}
|
|
|
|
x = xfrm_state_lookup(net, skb->mark, daddr, spi, nexthdr, family);
|
|
if (x == NULL) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES);
|
|
xfrm_audit_state_notfound(skb, family, spi, seq);
|
|
goto drop;
|
|
}
|
|
|
|
skb->sp->xvec[skb->sp->len++] = x;
|
|
|
|
spin_lock(&x->lock);
|
|
if (unlikely(x->km.state != XFRM_STATE_VALID)) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEINVALID);
|
|
goto drop_unlock;
|
|
}
|
|
|
|
if ((x->encap ? x->encap->encap_type : 0) != encap_type) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
|
|
goto drop_unlock;
|
|
}
|
|
|
|
if (x->repl->check(x, skb, seq)) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR);
|
|
goto drop_unlock;
|
|
}
|
|
|
|
if (xfrm_state_check_expire(x)) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEEXPIRED);
|
|
goto drop_unlock;
|
|
}
|
|
|
|
spin_unlock(&x->lock);
|
|
|
|
seq_hi = htonl(xfrm_replay_seqhi(x, seq));
|
|
|
|
XFRM_SKB_CB(skb)->seq.input.low = seq;
|
|
XFRM_SKB_CB(skb)->seq.input.hi = seq_hi;
|
|
|
|
skb_dst_force(skb);
|
|
|
|
nexthdr = x->type->input(x, skb);
|
|
|
|
if (nexthdr == -EINPROGRESS)
|
|
return 0;
|
|
|
|
resume:
|
|
spin_lock(&x->lock);
|
|
if (nexthdr <= 0) {
|
|
if (nexthdr == -EBADMSG) {
|
|
xfrm_audit_state_icvfail(x, skb,
|
|
x->type->proto);
|
|
x->stats.integrity_failed++;
|
|
}
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
|
|
goto drop_unlock;
|
|
}
|
|
|
|
/* only the first xfrm gets the encap type */
|
|
encap_type = 0;
|
|
|
|
x->repl->advance(x, seq);
|
|
|
|
x->curlft.bytes += skb->len;
|
|
x->curlft.packets++;
|
|
|
|
spin_unlock(&x->lock);
|
|
|
|
XFRM_MODE_SKB_CB(skb)->protocol = nexthdr;
|
|
|
|
inner_mode = x->inner_mode;
|
|
|
|
if (x->sel.family == AF_UNSPEC) {
|
|
inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
|
|
if (inner_mode == NULL)
|
|
goto drop;
|
|
}
|
|
|
|
if (inner_mode->input(x, skb)) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
|
|
goto drop;
|
|
}
|
|
|
|
if (x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) {
|
|
decaps = 1;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* We need the inner address. However, we only get here for
|
|
* transport mode so the outer address is identical.
|
|
*/
|
|
daddr = &x->id.daddr;
|
|
family = x->outer_mode->afinfo->family;
|
|
|
|
err = xfrm_parse_spi(skb, nexthdr, &spi, &seq);
|
|
if (err < 0) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
|
|
goto drop;
|
|
}
|
|
} while (!err);
|
|
|
|
nf_reset(skb);
|
|
|
|
if (decaps) {
|
|
skb_dst_drop(skb);
|
|
netif_rx(skb);
|
|
return 0;
|
|
} else {
|
|
return x->inner_mode->afinfo->transport_finish(skb, async);
|
|
}
|
|
|
|
drop_unlock:
|
|
spin_unlock(&x->lock);
|
|
drop:
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_input);
|
|
|
|
int xfrm_input_resume(struct sk_buff *skb, int nexthdr)
|
|
{
|
|
return xfrm_input(skb, nexthdr, 0, -1);
|
|
}
|
|
EXPORT_SYMBOL(xfrm_input_resume);
|
|
|
|
void __init xfrm_input_init(void)
|
|
{
|
|
secpath_cachep = kmem_cache_create("secpath_cache",
|
|
sizeof(struct sec_path),
|
|
0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
|
|
NULL);
|
|
}
|