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authorHerbert Xu <herbert@gondor.apana.org.au>2023-03-10 10:26:05 +0100
committerSteffen Klassert <steffen.klassert@secunet.com>2023-03-13 11:51:13 +0100
commit5f24f41e8ea62a6a9095f9bbafb8b3aebe265c68 (patch)
treeb0912e99ded2a836115edd5b0c0aa7b0a7fdb9aa /net/xfrm/xfrm_input.c
parentqede: remove linux/version.h and linux/compiler.h (diff)
downloadlinux-5f24f41e8ea62a6a9095f9bbafb8b3aebe265c68.tar.xz
linux-5f24f41e8ea62a6a9095f9bbafb8b3aebe265c68.zip
xfrm: Remove inner/outer modes from input path
The inner/outer modes were added to abstract out common code that were once duplicated between IPv4 and IPv6. As time went on the abstractions have been removed and we are now left with empty shells that only contain duplicate information. These can be removed one-by-one as the same information is already present elsewhere in the xfrm_state object. Removing them from the input path actually allows certain valid combinations that are currently disallowed. In particular, when a transport mode SA sits beneath a tunnel mode SA that changes address families, at present the transport mode SA cannot have AF_UNSPEC as its selector because it will be erroneously be treated as inter-family itself even though it simply sits beneath one. This is a serious problem because you can't set the selector to non-AF_UNSPEC either as that will cause the selector match to fail as we always match selectors to the inner-most traffic. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Diffstat (limited to 'net/xfrm/xfrm_input.c')
-rw-r--r--net/xfrm/xfrm_input.c66
1 files changed, 23 insertions, 43 deletions
diff --git a/net/xfrm/xfrm_input.c b/net/xfrm/xfrm_input.c
index 436d29640ac2..39fb91ff23d9 100644
--- a/net/xfrm/xfrm_input.c
+++ b/net/xfrm/xfrm_input.c
@@ -231,9 +231,6 @@ static int xfrm4_remove_tunnel_encap(struct xfrm_state *x, struct sk_buff *skb)
{
int err = -EINVAL;
- if (XFRM_MODE_SKB_CB(skb)->protocol != IPPROTO_IPIP)
- goto out;
-
if (!pskb_may_pull(skb, sizeof(struct iphdr)))
goto out;
@@ -269,8 +266,6 @@ static int xfrm6_remove_tunnel_encap(struct xfrm_state *x, struct sk_buff *skb)
{
int err = -EINVAL;
- if (XFRM_MODE_SKB_CB(skb)->protocol != IPPROTO_IPV6)
- goto out;
if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
goto out;
@@ -331,22 +326,26 @@ out:
*/
static int
xfrm_inner_mode_encap_remove(struct xfrm_state *x,
- const struct xfrm_mode *inner_mode,
struct sk_buff *skb)
{
- switch (inner_mode->encap) {
+ switch (x->props.mode) {
case XFRM_MODE_BEET:
- if (inner_mode->family == AF_INET)
+ switch (XFRM_MODE_SKB_CB(skb)->protocol) {
+ case IPPROTO_IPIP:
+ case IPPROTO_BEETPH:
return xfrm4_remove_beet_encap(x, skb);
- if (inner_mode->family == AF_INET6)
+ case IPPROTO_IPV6:
return xfrm6_remove_beet_encap(x, skb);
+ }
break;
case XFRM_MODE_TUNNEL:
- if (inner_mode->family == AF_INET)
+ switch (XFRM_MODE_SKB_CB(skb)->protocol) {
+ case IPPROTO_IPIP:
return xfrm4_remove_tunnel_encap(x, skb);
- if (inner_mode->family == AF_INET6)
+ case IPPROTO_IPV6:
return xfrm6_remove_tunnel_encap(x, skb);
break;
+ }
}
WARN_ON_ONCE(1);
@@ -355,9 +354,7 @@ xfrm_inner_mode_encap_remove(struct xfrm_state *x,
static int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb)
{
- const struct xfrm_mode *inner_mode = &x->inner_mode;
-
- switch (x->outer_mode.family) {
+ switch (x->props.family) {
case AF_INET:
xfrm4_extract_header(skb);
break;
@@ -369,17 +366,12 @@ static int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb)
return -EAFNOSUPPORT;
}
- if (x->sel.family == AF_UNSPEC) {
- inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
- if (!inner_mode)
- return -EAFNOSUPPORT;
- }
-
- switch (inner_mode->family) {
- case AF_INET:
+ switch (XFRM_MODE_SKB_CB(skb)->protocol) {
+ case IPPROTO_IPIP:
+ case IPPROTO_BEETPH:
skb->protocol = htons(ETH_P_IP);
break;
- case AF_INET6:
+ case IPPROTO_IPV6:
skb->protocol = htons(ETH_P_IPV6);
break;
default:
@@ -387,7 +379,7 @@ static int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb)
break;
}
- return xfrm_inner_mode_encap_remove(x, inner_mode, skb);
+ return xfrm_inner_mode_encap_remove(x, skb);
}
/* Remove encapsulation header.
@@ -433,17 +425,16 @@ static int xfrm6_transport_input(struct xfrm_state *x, struct sk_buff *skb)
}
static int xfrm_inner_mode_input(struct xfrm_state *x,
- const struct xfrm_mode *inner_mode,
struct sk_buff *skb)
{
- switch (inner_mode->encap) {
+ switch (x->props.mode) {
case XFRM_MODE_BEET:
case XFRM_MODE_TUNNEL:
return xfrm_prepare_input(x, skb);
case XFRM_MODE_TRANSPORT:
- if (inner_mode->family == AF_INET)
+ if (x->props.family == AF_INET)
return xfrm4_transport_input(x, skb);
- if (inner_mode->family == AF_INET6)
+ if (x->props.family == AF_INET6)
return xfrm6_transport_input(x, skb);
break;
case XFRM_MODE_ROUTEOPTIMIZATION:
@@ -461,7 +452,6 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
{
const struct xfrm_state_afinfo *afinfo;
struct net *net = dev_net(skb->dev);
- const struct xfrm_mode *inner_mode;
int err;
__be32 seq;
__be32 seq_hi;
@@ -491,7 +481,7 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
goto drop;
}
- family = x->outer_mode.family;
+ family = x->props.family;
/* An encap_type of -1 indicates async resumption. */
if (encap_type == -1) {
@@ -676,17 +666,7 @@ resume:
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) {
- XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
- goto drop;
- }
- }
-
- if (xfrm_inner_mode_input(x, inner_mode, skb)) {
+ if (xfrm_inner_mode_input(x, skb)) {
XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
goto drop;
}
@@ -701,7 +681,7 @@ resume:
* transport mode so the outer address is identical.
*/
daddr = &x->id.daddr;
- family = x->outer_mode.family;
+ family = x->props.family;
err = xfrm_parse_spi(skb, nexthdr, &spi, &seq);
if (err < 0) {
@@ -732,7 +712,7 @@ resume:
err = -EAFNOSUPPORT;
rcu_read_lock();
- afinfo = xfrm_state_afinfo_get_rcu(x->inner_mode.family);
+ afinfo = xfrm_state_afinfo_get_rcu(x->props.family);
if (likely(afinfo))
err = afinfo->transport_finish(skb, xfrm_gro || async);
rcu_read_unlock();