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authorFlorian Westphal <fw@strlen.de>2019-03-29 21:16:30 +0100
committerSteffen Klassert <steffen.klassert@secunet.com>2019-04-08 09:15:09 +0200
commit733a5fac2f15b55b9059230d098ed04341d2d884 (patch)
tree7d432c5ea1d82f7af81fcd0796e22f4b7b138d0b /net/xfrm
parentxfrm: remove output2 indirection from xfrm_mode (diff)
downloadlinux-dev-733a5fac2f15b55b9059230d098ed04341d2d884.tar.xz
linux-dev-733a5fac2f15b55b9059230d098ed04341d2d884.zip
xfrm: remove afinfo pointer from xfrm_mode
Adds an EXPORT_SYMBOL for afinfo_get_rcu, as it will now be called from ipv6 in case of CONFIG_IPV6=m. This change has virtually no effect on vmlinux size, but it reduces afinfo size and allows followup patch to make xfrm modes const. v2: mark if (afinfo) tests as likely (Sabrina) re-fetch afinfo according to inner_mode in xfrm_prepare_input(). Signed-off-by: Florian Westphal <fw@strlen.de> Reviewed-by: Sabrina Dubroca <sd@queasysnail.net> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Diffstat (limited to 'net/xfrm')
-rw-r--r--net/xfrm/xfrm_input.c34
-rw-r--r--net/xfrm/xfrm_output.c12
-rw-r--r--net/xfrm/xfrm_policy.c10
-rw-r--r--net/xfrm/xfrm_state.c4
4 files changed, 50 insertions, 10 deletions
diff --git a/net/xfrm/xfrm_input.c b/net/xfrm/xfrm_input.c
index e0fd9561ffe5..74b53c13279b 100644
--- a/net/xfrm/xfrm_input.c
+++ b/net/xfrm/xfrm_input.c
@@ -352,19 +352,35 @@ xfrm_inner_mode_encap_remove(struct xfrm_state *x,
static int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb)
{
struct xfrm_mode *inner_mode = x->inner_mode;
- int err;
+ const struct xfrm_state_afinfo *afinfo;
+ int err = -EAFNOSUPPORT;
- err = x->outer_mode->afinfo->extract_input(x, skb);
- if (err)
+ rcu_read_lock();
+ afinfo = xfrm_state_afinfo_get_rcu(x->outer_mode->family);
+ if (likely(afinfo))
+ err = afinfo->extract_input(x, skb);
+
+ if (err) {
+ rcu_read_unlock();
return err;
+ }
if (x->sel.family == AF_UNSPEC) {
inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
- if (inner_mode == NULL)
+ if (!inner_mode) {
+ rcu_read_unlock();
return -EAFNOSUPPORT;
+ }
}
- skb->protocol = inner_mode->afinfo->eth_proto;
+ afinfo = xfrm_state_afinfo_get_rcu(inner_mode->family);
+ if (unlikely(!afinfo)) {
+ rcu_read_unlock();
+ return -EAFNOSUPPORT;
+ }
+
+ skb->protocol = afinfo->eth_proto;
+ rcu_read_unlock();
return xfrm_inner_mode_encap_remove(x, inner_mode, skb);
}
@@ -440,6 +456,7 @@ static int xfrm_inner_mode_input(struct xfrm_state *x,
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);
int err;
__be32 seq;
@@ -705,7 +722,12 @@ resume:
if (xo)
xfrm_gro = xo->flags & XFRM_GRO;
- err = x->inner_mode->afinfo->transport_finish(skb, xfrm_gro || async);
+ err = -EAFNOSUPPORT;
+ rcu_read_lock();
+ afinfo = xfrm_state_afinfo_get_rcu(x->inner_mode->family);
+ if (likely(afinfo))
+ err = afinfo->transport_finish(skb, xfrm_gro || async);
+ rcu_read_unlock();
if (xfrm_gro) {
sp = skb_sec_path(skb);
if (sp)
diff --git a/net/xfrm/xfrm_output.c b/net/xfrm/xfrm_output.c
index 9bdf16f13606..17c4f58d28ea 100644
--- a/net/xfrm/xfrm_output.c
+++ b/net/xfrm/xfrm_output.c
@@ -623,7 +623,10 @@ EXPORT_SYMBOL_GPL(xfrm_output);
static int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb)
{
+ const struct xfrm_state_afinfo *afinfo;
struct xfrm_mode *inner_mode;
+ int err = -EAFNOSUPPORT;
+
if (x->sel.family == AF_UNSPEC)
inner_mode = xfrm_ip2inner_mode(x,
xfrm_af2proto(skb_dst(skb)->ops->family));
@@ -632,7 +635,14 @@ static int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb)
if (inner_mode == NULL)
return -EAFNOSUPPORT;
- return inner_mode->afinfo->extract_output(x, skb);
+
+ rcu_read_lock();
+ afinfo = xfrm_state_afinfo_get_rcu(inner_mode->family);
+ if (likely(afinfo))
+ err = afinfo->extract_output(x, skb);
+ rcu_read_unlock();
+
+ return err;
}
void xfrm_local_error(struct sk_buff *skb, int mtu)
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 8d1a898d0ba5..67122beb116c 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -2545,6 +2545,7 @@ static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
const struct flowi *fl,
struct dst_entry *dst)
{
+ const struct xfrm_state_afinfo *afinfo;
struct net *net = xp_net(policy);
unsigned long now = jiffies;
struct net_device *dev;
@@ -2622,7 +2623,14 @@ static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
dst1->lastuse = now;
dst1->input = dst_discard;
- dst1->output = inner_mode->afinfo->output;
+
+ rcu_read_lock();
+ afinfo = xfrm_state_afinfo_get_rcu(inner_mode->family);
+ if (likely(afinfo))
+ dst1->output = afinfo->output;
+ else
+ dst1->output = dst_discard_out;
+ rcu_read_unlock();
xdst_prev = xdst;
diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index c32394b59776..358b09f0d018 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -354,7 +354,6 @@ int xfrm_register_mode(struct xfrm_mode *mode)
if (!try_module_get(afinfo->owner))
goto out;
- mode->afinfo = afinfo;
modemap[mode->encap] = mode;
err = 0;
@@ -378,7 +377,7 @@ void xfrm_unregister_mode(struct xfrm_mode *mode)
spin_lock_bh(&xfrm_mode_lock);
if (likely(modemap[mode->encap] == mode)) {
modemap[mode->encap] = NULL;
- module_put(mode->afinfo->owner);
+ module_put(afinfo->owner);
}
spin_unlock_bh(&xfrm_mode_lock);
@@ -2188,6 +2187,7 @@ struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family)
return rcu_dereference(xfrm_state_afinfo[family]);
}
+EXPORT_SYMBOL_GPL(xfrm_state_afinfo_get_rcu);
struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
{