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xfrm: Add dir validation to "in" data path lookup 

Introduces validation for the x->dir attribute within the XFRM input
data lookup path. If the configured direction does not match the
expected direction, input, increment the XfrmInStateDirError counter
and drop the packet to ensure data integrity and correct flow handling.

grep -vw 0 /proc/net/xfrm_stat
XfrmInStateDirError     	1

Signed-off-by: Antony Antony <antony.antony@secunet.com>
Reviewed-by: Sabrina Dubroca <sd@queasysnail.net>
Reviewed-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Antony Antony 2024-04-30 09:09:29 +02:00 committed by Steffen Klassert
parent 601a0867f8
commit 304b44f0d5
5 changed files with 23 additions and 0 deletions
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3
Documentation/networking/xfrm_proc.rst
View File

@ -73,6 +73,9 @@ XfrmAcquireError:
XfrmFwdHdrError:
Forward routing of a packet is not allowed
XfrmInStateDirError:
State direction mismatch (lookup found an output state on the input path, expected input or no direction)
Outbound errors
~~~~~~~~~~~~~~~
XfrmOutError:

1
include/uapi/linux/snmp.h
View File

@ -338,6 +338,7 @@ enum
LINUX_MIB_XFRMOUTSTATEINVALID, /* XfrmOutStateInvalid */
LINUX_MIB_XFRMACQUIREERROR, /* XfrmAcquireError */
LINUX_MIB_XFRMOUTSTATEDIRERROR, /* XfrmOutStateDirError */
LINUX_MIB_XFRMINSTATEDIRERROR, /* XfrmInStateDirError */
__LINUX_MIB_XFRMMAX
};

7
net/ipv6/xfrm6_input.c
View File

@ -266,6 +266,13 @@ int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
if (!x)
continue;
if (unlikely(x->dir && x->dir != XFRM_SA_DIR_IN)) {
XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEDIRERROR);
xfrm_state_put(x);
x = NULL;
continue;
}
spin_lock(&x->lock);
if ((!i || (x->props.flags & XFRM_STATE_WILDRECV)) &&

11
net/xfrm/xfrm_input.c
View File

@ -466,6 +466,11 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
if (encap_type < 0 || (xo && xo->flags & XFRM_GRO)) {
x = xfrm_input_state(skb);
if (unlikely(x->dir && x->dir != XFRM_SA_DIR_IN)) {
XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEDIRERROR);
goto drop;
}
if (unlikely(x->km.state != XFRM_STATE_VALID)) {
if (x->km.state == XFRM_STATE_ACQ)
XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR);
@ -571,6 +576,12 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
goto drop;
}
if (unlikely(x->dir && x->dir != XFRM_SA_DIR_IN)) {
XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEDIRERROR);
xfrm_state_put(x);
goto drop;
}
skb->mark = xfrm_smark_get(skb->mark, x);
sp->xvec[sp->len++] = x;

1
net/xfrm/xfrm_proc.c
View File

@ -42,6 +42,7 @@ static const struct snmp_mib xfrm_mib_list[] = {
SNMP_MIB_ITEM("XfrmOutStateInvalid", LINUX_MIB_XFRMOUTSTATEINVALID),
SNMP_MIB_ITEM("XfrmAcquireError", LINUX_MIB_XFRMACQUIREERROR),
SNMP_MIB_ITEM("XfrmOutStateDirError", LINUX_MIB_XFRMOUTSTATEDIRERROR),
SNMP_MIB_ITEM("XfrmInStateDirError", LINUX_MIB_XFRMINSTATEDIRERROR),
SNMP_MIB_SENTINEL
};