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path: root/net/xfrm/xfrm_state.c
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Diffstat (limited to 'net/xfrm/xfrm_state.c')
-rw-r--r--net/xfrm/xfrm_state.c206
1 files changed, 197 insertions, 9 deletions
diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index 344f0a6abec..224b44e31a0 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -57,6 +57,9 @@ static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024;
static unsigned int xfrm_state_num;
static unsigned int xfrm_state_genid;
+static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
+static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo);
+
static inline unsigned int xfrm_dst_hash(xfrm_address_t *daddr,
xfrm_address_t *saddr,
u32 reqid,
@@ -187,6 +190,184 @@ int __xfrm_state_delete(struct xfrm_state *x);
int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
+static struct xfrm_state_afinfo *xfrm_state_lock_afinfo(unsigned int family)
+{
+ struct xfrm_state_afinfo *afinfo;
+ if (unlikely(family >= NPROTO))
+ return NULL;
+ write_lock_bh(&xfrm_state_afinfo_lock);
+ afinfo = xfrm_state_afinfo[family];
+ if (unlikely(!afinfo))
+ write_unlock_bh(&xfrm_state_afinfo_lock);
+ return afinfo;
+}
+
+static void xfrm_state_unlock_afinfo(struct xfrm_state_afinfo *afinfo)
+{
+ write_unlock_bh(&xfrm_state_afinfo_lock);
+}
+
+int xfrm_register_type(struct xfrm_type *type, unsigned short family)
+{
+ struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family);
+ struct xfrm_type **typemap;
+ int err = 0;
+
+ if (unlikely(afinfo == NULL))
+ return -EAFNOSUPPORT;
+ typemap = afinfo->type_map;
+
+ if (likely(typemap[type->proto] == NULL))
+ typemap[type->proto] = type;
+ else
+ err = -EEXIST;
+ xfrm_state_unlock_afinfo(afinfo);
+ return err;
+}
+EXPORT_SYMBOL(xfrm_register_type);
+
+int xfrm_unregister_type(struct xfrm_type *type, unsigned short family)
+{
+ struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family);
+ struct xfrm_type **typemap;
+ int err = 0;
+
+ if (unlikely(afinfo == NULL))
+ return -EAFNOSUPPORT;
+ typemap = afinfo->type_map;
+
+ if (unlikely(typemap[type->proto] != type))
+ err = -ENOENT;
+ else
+ typemap[type->proto] = NULL;
+ xfrm_state_unlock_afinfo(afinfo);
+ return err;
+}
+EXPORT_SYMBOL(xfrm_unregister_type);
+
+static struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
+{
+ struct xfrm_state_afinfo *afinfo;
+ struct xfrm_type **typemap;
+ struct xfrm_type *type;
+ int modload_attempted = 0;
+
+retry:
+ afinfo = xfrm_state_get_afinfo(family);
+ if (unlikely(afinfo == NULL))
+ return NULL;
+ typemap = afinfo->type_map;
+
+ type = typemap[proto];
+ if (unlikely(type && !try_module_get(type->owner)))
+ type = NULL;
+ if (!type && !modload_attempted) {
+ xfrm_state_put_afinfo(afinfo);
+ request_module("xfrm-type-%d-%d", family, proto);
+ modload_attempted = 1;
+ goto retry;
+ }
+
+ xfrm_state_put_afinfo(afinfo);
+ return type;
+}
+
+static void xfrm_put_type(struct xfrm_type *type)
+{
+ module_put(type->owner);
+}
+
+int xfrm_register_mode(struct xfrm_mode *mode, int family)
+{
+ struct xfrm_state_afinfo *afinfo;
+ struct xfrm_mode **modemap;
+ int err;
+
+ if (unlikely(mode->encap >= XFRM_MODE_MAX))
+ return -EINVAL;
+
+ afinfo = xfrm_state_lock_afinfo(family);
+ if (unlikely(afinfo == NULL))
+ return -EAFNOSUPPORT;
+
+ err = -EEXIST;
+ modemap = afinfo->mode_map;
+ if (modemap[mode->encap])
+ goto out;
+
+ err = -ENOENT;
+ if (!try_module_get(afinfo->owner))
+ goto out;
+
+ mode->afinfo = afinfo;
+ modemap[mode->encap] = mode;
+ err = 0;
+
+out:
+ xfrm_state_unlock_afinfo(afinfo);
+ return err;
+}
+EXPORT_SYMBOL(xfrm_register_mode);
+
+int xfrm_unregister_mode(struct xfrm_mode *mode, int family)
+{
+ struct xfrm_state_afinfo *afinfo;
+ struct xfrm_mode **modemap;
+ int err;
+
+ if (unlikely(mode->encap >= XFRM_MODE_MAX))
+ return -EINVAL;
+
+ afinfo = xfrm_state_lock_afinfo(family);
+ if (unlikely(afinfo == NULL))
+ return -EAFNOSUPPORT;
+
+ err = -ENOENT;
+ modemap = afinfo->mode_map;
+ if (likely(modemap[mode->encap] == mode)) {
+ modemap[mode->encap] = NULL;
+ module_put(mode->afinfo->owner);
+ err = 0;
+ }
+
+ xfrm_state_unlock_afinfo(afinfo);
+ return err;
+}
+EXPORT_SYMBOL(xfrm_unregister_mode);
+
+static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
+{
+ struct xfrm_state_afinfo *afinfo;
+ struct xfrm_mode *mode;
+ int modload_attempted = 0;
+
+ if (unlikely(encap >= XFRM_MODE_MAX))
+ return NULL;
+
+retry:
+ afinfo = xfrm_state_get_afinfo(family);
+ if (unlikely(afinfo == NULL))
+ return NULL;
+
+ mode = afinfo->mode_map[encap];
+ if (unlikely(mode && !try_module_get(mode->owner)))
+ mode = NULL;
+ if (!mode && !modload_attempted) {
+ xfrm_state_put_afinfo(afinfo);
+ request_module("xfrm-mode-%d-%d", family, encap);
+ modload_attempted = 1;
+ goto retry;
+ }
+
+ xfrm_state_put_afinfo(afinfo);
+ return mode;
+}
+
+static void xfrm_put_mode(struct xfrm_mode *mode)
+{
+ module_put(mode->owner);
+}
+
static void xfrm_state_gc_destroy(struct xfrm_state *x)
{
del_timer_sync(&x->timer);
@@ -196,8 +377,10 @@ static void xfrm_state_gc_destroy(struct xfrm_state *x)
kfree(x->calg);
kfree(x->encap);
kfree(x->coaddr);
- if (x->mode)
- xfrm_put_mode(x->mode);
+ if (x->inner_mode)
+ xfrm_put_mode(x->inner_mode);
+ if (x->outer_mode)
+ xfrm_put_mode(x->outer_mode);
if (x->type) {
x->type->destructor(x);
xfrm_put_type(x->type);
@@ -1699,7 +1882,7 @@ int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
}
EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
-struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned short family)
+static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
{
struct xfrm_state_afinfo *afinfo;
if (unlikely(family >= NPROTO))
@@ -1711,14 +1894,11 @@ struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned short family)
return afinfo;
}
-void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo)
+static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo)
{
read_unlock(&xfrm_state_afinfo_lock);
}
-EXPORT_SYMBOL(xfrm_state_get_afinfo);
-EXPORT_SYMBOL(xfrm_state_put_afinfo);
-
/* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
void xfrm_state_delete_tunnel(struct xfrm_state *x)
{
@@ -1769,6 +1949,14 @@ int xfrm_init_state(struct xfrm_state *x)
goto error;
err = -EPROTONOSUPPORT;
+ x->inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
+ if (x->inner_mode == NULL)
+ goto error;
+
+ if (!(x->inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
+ family != x->sel.family)
+ goto error;
+
x->type = xfrm_get_type(x->id.proto, family);
if (x->type == NULL)
goto error;
@@ -1777,8 +1965,8 @@ int xfrm_init_state(struct xfrm_state *x)
if (err)
goto error;
- x->mode = xfrm_get_mode(x->props.mode, family);
- if (x->mode == NULL)
+ x->outer_mode = xfrm_get_mode(x->props.mode, family);
+ if (x->outer_mode == NULL)
goto error;
x->km.state = XFRM_STATE_VALID;
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-13 03:03:42 +0000