[IPSEC]: Move type and mode map into xfrm_state.c

[deliverable/linux.git] / net / xfrm / xfrm_state.c

diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index 344f0a6abec53aacd0da9dfe9600854f130c5f7b..dc438f2b944226a26ec45033d5ff73cffe8dc433 100644 (file)
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -187,6 +187,176 @@ 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 (likely(modemap[mode->encap] == NULL)) {
+               modemap[mode->encap] = mode;
+               err = 0;
+       }
+
+       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;
+               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);