diff options
Diffstat (limited to 'net/xfrm/xfrm_state.c')
| -rw-r--r-- | net/xfrm/xfrm_state.c | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c index 344f0a6abec5..dc438f2b9442 100644 --- 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); |