diff options
Diffstat (limited to 'include/net/genetlink.h')
| -rw-r--r-- | include/net/genetlink.h | 48 |
1 files changed, 31 insertions, 17 deletions
diff --git a/include/net/genetlink.h b/include/net/genetlink.h index 60aef0df386b..ace4abf118d7 100644 --- a/include/net/genetlink.h +++ b/include/net/genetlink.h @@ -10,14 +10,9 @@ /** * struct genl_multicast_group - generic netlink multicast group * @name: name of the multicast group, names are per-family - * @id: multicast group ID, assigned by the core, to use with - * genlmsg_multicast(). - * @list: list entry for linking */ struct genl_multicast_group { - struct list_head list; /* private */ char name[GENL_NAMSIZ]; - u32 id; }; struct genl_ops; @@ -38,7 +33,9 @@ struct genl_info; * undo operations done by pre_doit, for example release locks * @attrbuf: buffer to store parsed attributes * @family_list: family list - * @mcast_groups: multicast groups list + * @mcgrps: multicast groups used by this family (private) + * @n_mcgrps: number of multicast groups (private) + * @mcgrp_offset: starting number of multicast group IDs in this family * @ops: the operations supported by this family (private) * @n_ops: number of operations supported by this family (private) */ @@ -58,9 +55,11 @@ struct genl_family { struct genl_info *info); struct nlattr ** attrbuf; /* private */ const struct genl_ops * ops; /* private */ + const struct genl_multicast_group *mcgrps; /* private */ unsigned int n_ops; /* private */ + unsigned int n_mcgrps; /* private */ + unsigned int mcgrp_offset; /* private */ struct list_head family_list; /* private */ - struct list_head mcast_groups; /* private */ struct module *module; }; @@ -150,22 +149,30 @@ static inline int genl_register_family(struct genl_family *family) * * Return 0 on success or a negative error code. */ -static inline int _genl_register_family_with_ops(struct genl_family *family, - const struct genl_ops *ops, - size_t n_ops) +static inline int +_genl_register_family_with_ops_grps(struct genl_family *family, + const struct genl_ops *ops, size_t n_ops, + const struct genl_multicast_group *mcgrps, + size_t n_mcgrps) { family->module = THIS_MODULE; family->ops = ops; family->n_ops = n_ops; + family->mcgrps = mcgrps; + family->n_mcgrps = n_mcgrps; return __genl_register_family(family); } -#define genl_register_family_with_ops(family, ops) \ - _genl_register_family_with_ops((family), (ops), ARRAY_SIZE(ops)) +#define genl_register_family_with_ops(family, ops) \ + _genl_register_family_with_ops_grps((family), \ + (ops), ARRAY_SIZE(ops), \ + NULL, 0) +#define genl_register_family_with_ops_groups(family, ops, grps) \ + _genl_register_family_with_ops_grps((family), \ + (ops), ARRAY_SIZE(ops), \ + (grps), ARRAY_SIZE(grps)) int genl_unregister_family(struct genl_family *family); -int genl_register_mc_group(struct genl_family *family, - struct genl_multicast_group *grp); void genl_notify(struct genl_family *family, struct sk_buff *skb, struct net *net, u32 portid, u32 group, struct nlmsghdr *nlh, gfp_t flags); @@ -251,13 +258,16 @@ static inline void genlmsg_cancel(struct sk_buff *skb, void *hdr) * @net: the net namespace * @skb: netlink message as socket buffer * @portid: own netlink portid to avoid sending to yourself - * @group: multicast group id + * @group: offset of multicast group in groups array * @flags: allocation flags */ static inline int genlmsg_multicast_netns(struct genl_family *family, struct net *net, struct sk_buff *skb, u32 portid, unsigned int group, gfp_t flags) { + if (group >= family->n_mcgrps) + return -EINVAL; + group = family->mcgrp_offset + group; return nlmsg_multicast(net->genl_sock, skb, portid, group, flags); } @@ -266,13 +276,16 @@ static inline int genlmsg_multicast_netns(struct genl_family *family, * @family: the generic netlink family * @skb: netlink message as socket buffer * @portid: own netlink portid to avoid sending to yourself - * @group: multicast group id + * @group: offset of multicast group in groups array * @flags: allocation flags */ static inline int genlmsg_multicast(struct genl_family *family, struct sk_buff *skb, u32 portid, unsigned int group, gfp_t flags) { + if (group >= family->n_mcgrps) + return -EINVAL; + group = family->mcgrp_offset + group; return genlmsg_multicast_netns(family, &init_net, skb, portid, group, flags); } @@ -282,7 +295,7 @@ static inline int genlmsg_multicast(struct genl_family *family, * @family: the generic netlink family * @skb: netlink message as socket buffer * @portid: own netlink portid to avoid sending to yourself - * @group: multicast group id + * @group: offset of multicast group in groups array * @flags: allocation flags * * This function must hold the RTNL or rcu_read_lock(). @@ -365,6 +378,7 @@ static inline struct sk_buff *genlmsg_new(size_t payload, gfp_t flags) * @net: the network namespace to report the error to * @portid: the PORTID of a process that we want to skip (if any) * @group: the broadcast group that will notice the error + * (this is the offset of the multicast group in the groups array) * @code: error code, must be negative (as usual in kernelspace) * * This function returns the number of broadcast listeners that have set the |