genetlink: use idr to track families
Since generic netlink family IDs are small integers, allocated densely, IDR is an ideal match for lookups. Replace the existing hand-written hash-table with IDR for allocation and lookup. This lets the families only be written to once, during register, since the list_head can be removed and removal of a family won't cause any writes. It also slightly reduces the code size (by about 1.3k on x86-64). Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Johannes Berg
David S. Miller
Родитель
489111e5c2
Коммит
2ae0f17df1
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@ -40,7 +40,6 @@ struct genl_info;
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* generic netlink family is removed while there are still open
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* sockets.
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* @attrbuf: buffer to store parsed attributes (private)
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* @family_list: family list (private)
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* @mcgrps: multicast groups used by this family
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* @n_mcgrps: number of multicast groups
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* @mcgrp_offset: starting number of multicast group IDs in this family
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@ -70,11 +69,10 @@ struct genl_family {
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unsigned int n_ops;
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unsigned int n_mcgrps;
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unsigned int mcgrp_offset; /* private */
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struct list_head family_list; /* private */
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struct module *module;
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};
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struct nlattr **genl_family_attrbuf(struct genl_family *family);
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struct nlattr **genl_family_attrbuf(const struct genl_family *family);
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/**
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* struct genl_info - receiving information
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@ -134,12 +132,12 @@ struct genl_ops {
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};
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int genl_register_family(struct genl_family *family);
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int genl_unregister_family(struct genl_family *family);
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void genl_notify(struct genl_family *family, struct sk_buff *skb,
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int genl_unregister_family(const struct genl_family *family);
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void genl_notify(const struct genl_family *family, struct sk_buff *skb,
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struct genl_info *info, u32 group, gfp_t flags);
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void *genlmsg_put(struct sk_buff *skb, u32 portid, u32 seq,
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struct genl_family *family, int flags, u8 cmd);
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const struct genl_family *family, int flags, u8 cmd);
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/**
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* genlmsg_nlhdr - Obtain netlink header from user specified header
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@ -148,8 +146,8 @@ void *genlmsg_put(struct sk_buff *skb, u32 portid, u32 seq,
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*
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* Returns pointer to netlink header.
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*/
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static inline struct nlmsghdr *genlmsg_nlhdr(void *user_hdr,
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struct genl_family *family)
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static inline struct nlmsghdr *
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genlmsg_nlhdr(void *user_hdr, const struct genl_family *family)
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{
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return (struct nlmsghdr *)((char *)user_hdr -
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family->hdrsize -
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@ -185,7 +183,7 @@ static inline int genlmsg_parse(const struct nlmsghdr *nlh,
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*/
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static inline void genl_dump_check_consistent(struct netlink_callback *cb,
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void *user_hdr,
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struct genl_family *family)
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const struct genl_family *family)
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{
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nl_dump_check_consistent(cb, genlmsg_nlhdr(user_hdr, family));
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}
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@ -202,7 +200,7 @@ static inline void genl_dump_check_consistent(struct netlink_callback *cb,
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*/
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static inline void *genlmsg_put_reply(struct sk_buff *skb,
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struct genl_info *info,
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struct genl_family *family,
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const struct genl_family *family,
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int flags, u8 cmd)
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{
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return genlmsg_put(skb, info->snd_portid, info->snd_seq, family,
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@ -239,7 +237,7 @@ static inline void genlmsg_cancel(struct sk_buff *skb, void *hdr)
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* @group: offset of multicast group in groups array
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* @flags: allocation flags
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*/
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static inline int genlmsg_multicast_netns(struct genl_family *family,
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static inline int genlmsg_multicast_netns(const struct genl_family *family,
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struct net *net, struct sk_buff *skb,
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u32 portid, unsigned int group, gfp_t flags)
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{
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@ -257,7 +255,7 @@ static inline int genlmsg_multicast_netns(struct genl_family *family,
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* @group: offset of multicast group in groups array
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* @flags: allocation flags
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*/
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static inline int genlmsg_multicast(struct genl_family *family,
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static inline int genlmsg_multicast(const struct genl_family *family,
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struct sk_buff *skb, u32 portid,
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unsigned int group, gfp_t flags)
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{
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@ -275,7 +273,7 @@ static inline int genlmsg_multicast(struct genl_family *family,
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*
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* This function must hold the RTNL or rcu_read_lock().
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*/
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int genlmsg_multicast_allns(struct genl_family *family,
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int genlmsg_multicast_allns(const struct genl_family *family,
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struct sk_buff *skb, u32 portid,
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unsigned int group, gfp_t flags);
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@ -359,8 +357,9 @@ static inline struct sk_buff *genlmsg_new(size_t payload, gfp_t flags)
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* This function returns the number of broadcast listeners that have set the
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* NETLINK_RECV_NO_ENOBUFS socket option.
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*/
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static inline int genl_set_err(struct genl_family *family, struct net *net,
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u32 portid, u32 group, int code)
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static inline int genl_set_err(const struct genl_family *family,
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struct net *net, u32 portid,
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u32 group, int code)
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{
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if (WARN_ON_ONCE(group >= family->n_mcgrps))
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return -EINVAL;
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@ -368,7 +367,7 @@ static inline int genl_set_err(struct genl_family *family, struct net *net,
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return netlink_set_err(net->genl_sock, portid, group, code);
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}
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static inline int genl_has_listeners(struct genl_family *family,
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static inline int genl_has_listeners(const struct genl_family *family,
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struct net *net, unsigned int group)
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{
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if (WARN_ON_ONCE(group >= family->n_mcgrps))
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@ -29,6 +29,8 @@ struct genlmsghdr {
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#define GENL_ID_CTRL NLMSG_MIN_TYPE
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#define GENL_ID_VFS_DQUOT (NLMSG_MIN_TYPE + 1)
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#define GENL_ID_PMCRAID (NLMSG_MIN_TYPE + 2)
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/* must be last reserved + 1 */
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#define GENL_START_ALLOC (NLMSG_MIN_TYPE + 3)
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/**************************************************************************
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* Controller
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@ -17,6 +17,7 @@
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#include <linux/mutex.h>
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#include <linux/bitmap.h>
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#include <linux/rwsem.h>
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#include <linux/idr.h>
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#include <net/sock.h>
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#include <net/genetlink.h>
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@ -58,10 +59,8 @@ static void genl_unlock_all(void)
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up_write(&cb_lock);
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}
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#define GENL_FAM_TAB_SIZE 16
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#define GENL_FAM_TAB_MASK (GENL_FAM_TAB_SIZE - 1)
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static DEFINE_IDR(genl_fam_idr);
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static struct list_head family_ht[GENL_FAM_TAB_SIZE];
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/*
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* Bitmap of multicast groups that are currently in use.
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*
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@ -86,45 +85,29 @@ static unsigned long mc_group_start = 0x3 | BIT(GENL_ID_CTRL) |
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static unsigned long *mc_groups = &mc_group_start;
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static unsigned long mc_groups_longs = 1;
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static int genl_ctrl_event(int event, struct genl_family *family,
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static int genl_ctrl_event(int event, const struct genl_family *family,
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const struct genl_multicast_group *grp,
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int grp_id);
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static inline unsigned int genl_family_hash(unsigned int id)
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static const struct genl_family *genl_family_find_byid(unsigned int id)
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{
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return id & GENL_FAM_TAB_MASK;
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return idr_find(&genl_fam_idr, id);
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}
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static inline struct list_head *genl_family_chain(unsigned int id)
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static const struct genl_family *genl_family_find_byname(char *name)
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{
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return &family_ht[genl_family_hash(id)];
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}
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const struct genl_family *family;
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unsigned int id;
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static struct genl_family *genl_family_find_byid(unsigned int id)
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{
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struct genl_family *f;
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list_for_each_entry(f, genl_family_chain(id), family_list)
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if (f->id == id)
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return f;
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idr_for_each_entry(&genl_fam_idr, family, id)
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if (strcmp(family->name, name) == 0)
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return family;
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return NULL;
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}
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static struct genl_family *genl_family_find_byname(char *name)
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{
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struct genl_family *f;
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int i;
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for (i = 0; i < GENL_FAM_TAB_SIZE; i++)
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list_for_each_entry(f, genl_family_chain(i), family_list)
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if (strcmp(f->name, name) == 0)
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return f;
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return NULL;
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}
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static const struct genl_ops *genl_get_cmd(u8 cmd, struct genl_family *family)
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static const struct genl_ops *genl_get_cmd(u8 cmd,
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const struct genl_family *family)
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{
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int i;
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@ -135,26 +118,6 @@ static const struct genl_ops *genl_get_cmd(u8 cmd, struct genl_family *family)
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return NULL;
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}
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/* Of course we are going to have problems once we hit
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* 2^16 alive types, but that can only happen by year 2K
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*/
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static u16 genl_generate_id(void)
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{
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static u16 id_gen_idx = GENL_MIN_ID;
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int i;
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for (i = 0; i <= GENL_MAX_ID - GENL_MIN_ID; i++) {
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if (id_gen_idx != GENL_ID_VFS_DQUOT &&
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id_gen_idx != GENL_ID_PMCRAID &&
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!genl_family_find_byid(id_gen_idx))
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return id_gen_idx;
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if (++id_gen_idx > GENL_MAX_ID)
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id_gen_idx = GENL_MIN_ID;
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}
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return 0;
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}
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static int genl_allocate_reserve_groups(int n_groups, int *first_id)
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{
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unsigned long *new_groups;
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@ -295,7 +258,7 @@ static int genl_validate_assign_mc_groups(struct genl_family *family)
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return err;
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}
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static void genl_unregister_mc_groups(struct genl_family *family)
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static void genl_unregister_mc_groups(const struct genl_family *family)
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{
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struct net *net;
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int i;
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@ -358,6 +321,7 @@ static int genl_validate_ops(const struct genl_family *family)
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int genl_register_family(struct genl_family *family)
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{
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int err, i;
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int start = GENL_START_ALLOC, end = GENL_MAX_ID;
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err = genl_validate_ops(family);
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if (err)
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@ -370,34 +334,20 @@ int genl_register_family(struct genl_family *family)
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goto errout_locked;
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}
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/*
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* Sadly, a few cases need to be special-cased
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* due to them having previously abused the API
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* and having used their family ID also as their
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* multicast group ID, so we use reserved IDs
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* for both to be sure we can do that mapping.
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*/
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if (family == &genl_ctrl) {
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family->id = GENL_ID_CTRL;
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} else {
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u16 newid;
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/* this should be left zero in the struct */
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WARN_ON(family->id);
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/*
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* Sadly, a few cases need to be special-cased
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* due to them having previously abused the API
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* and having used their family ID also as their
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* multicast group ID, so we use reserved IDs
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* for both to be sure we can do that mapping.
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*/
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if (strcmp(family->name, "pmcraid") == 0)
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newid = GENL_ID_PMCRAID;
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else if (strcmp(family->name, "VFS_DQUOT") == 0)
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newid = GENL_ID_VFS_DQUOT;
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else
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newid = genl_generate_id();
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if (!newid) {
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err = -ENOMEM;
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goto errout_locked;
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}
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family->id = newid;
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/* and this needs to be special for initial family lookups */
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start = end = GENL_ID_CTRL;
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} else if (strcmp(family->name, "pmcraid") == 0) {
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start = end = GENL_ID_PMCRAID;
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} else if (strcmp(family->name, "VFS_DQUOT") == 0) {
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start = end = GENL_ID_VFS_DQUOT;
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}
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if (family->maxattr && !family->parallel_ops) {
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@ -410,11 +360,15 @@ int genl_register_family(struct genl_family *family)
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} else
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family->attrbuf = NULL;
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err = genl_validate_assign_mc_groups(family);
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if (err)
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family->id = idr_alloc(&genl_fam_idr, family,
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start, end + 1, GFP_KERNEL);
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if (!family->id)
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goto errout_locked;
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list_add_tail(&family->family_list, genl_family_chain(family->id));
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err = genl_validate_assign_mc_groups(family);
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if (err)
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goto errout_remove;
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genl_unlock_all();
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/* send all events */
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@ -425,6 +379,8 @@ int genl_register_family(struct genl_family *family)
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return 0;
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errout_remove:
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idr_remove(&genl_fam_idr, family->id);
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errout_locked:
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genl_unlock_all();
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return err;
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@ -439,32 +395,29 @@ EXPORT_SYMBOL(genl_register_family);
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*
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* Returns 0 on success or a negative error code.
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*/
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int genl_unregister_family(struct genl_family *family)
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int genl_unregister_family(const struct genl_family *family)
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{
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struct genl_family *rc;
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genl_lock_all();
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list_for_each_entry(rc, genl_family_chain(family->id), family_list) {
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if (family->id != rc->id || strcmp(rc->name, family->name))
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continue;
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genl_unregister_mc_groups(family);
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list_del(&rc->family_list);
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up_write(&cb_lock);
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wait_event(genl_sk_destructing_waitq,
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atomic_read(&genl_sk_destructing_cnt) == 0);
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genl_unlock();
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kfree(family->attrbuf);
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genl_ctrl_event(CTRL_CMD_DELFAMILY, family, NULL, 0);
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return 0;
|
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if (genl_family_find_byid(family->id)) {
|
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genl_unlock_all();
|
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return -ENOENT;
|
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}
|
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|
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genl_unlock_all();
|
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genl_unregister_mc_groups(family);
|
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|
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return -ENOENT;
|
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idr_remove(&genl_fam_idr, family->id);
|
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|
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up_write(&cb_lock);
|
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wait_event(genl_sk_destructing_waitq,
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atomic_read(&genl_sk_destructing_cnt) == 0);
|
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genl_unlock();
|
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|
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kfree(family->attrbuf);
|
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|
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genl_ctrl_event(CTRL_CMD_DELFAMILY, family, NULL, 0);
|
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|
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return 0;
|
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}
|
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EXPORT_SYMBOL(genl_unregister_family);
|
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|
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|
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@ -480,7 +433,7 @@ EXPORT_SYMBOL(genl_unregister_family);
|
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* Returns pointer to user specific header
|
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*/
|
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void *genlmsg_put(struct sk_buff *skb, u32 portid, u32 seq,
|
||||
struct genl_family *family, int flags, u8 cmd)
|
||||
const struct genl_family *family, int flags, u8 cmd)
|
||||
{
|
||||
struct nlmsghdr *nlh;
|
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struct genlmsghdr *hdr;
|
||||
|
|
@ -539,7 +492,7 @@ static int genl_lock_done(struct netlink_callback *cb)
|
|||
return rc;
|
||||
}
|
||||
|
||||
static int genl_family_rcv_msg(struct genl_family *family,
|
||||
static int genl_family_rcv_msg(const struct genl_family *family,
|
||||
struct sk_buff *skb,
|
||||
struct nlmsghdr *nlh)
|
||||
{
|
||||
|
|
@ -651,7 +604,7 @@ out:
|
|||
|
||||
static int genl_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
|
||||
{
|
||||
struct genl_family *family;
|
||||
const struct genl_family *family;
|
||||
int err;
|
||||
|
||||
family = genl_family_find_byid(nlh->nlmsg_type);
|
||||
|
|
@ -682,7 +635,7 @@ static void genl_rcv(struct sk_buff *skb)
|
|||
|
||||
static struct genl_family genl_ctrl;
|
||||
|
||||
static int ctrl_fill_info(struct genl_family *family, u32 portid, u32 seq,
|
||||
static int ctrl_fill_info(const struct genl_family *family, u32 portid, u32 seq,
|
||||
u32 flags, struct sk_buff *skb, u8 cmd)
|
||||
{
|
||||
void *hdr;
|
||||
|
|
@ -769,7 +722,7 @@ nla_put_failure:
|
|||
return -EMSGSIZE;
|
||||
}
|
||||
|
||||
static int ctrl_fill_mcgrp_info(struct genl_family *family,
|
||||
static int ctrl_fill_mcgrp_info(const struct genl_family *family,
|
||||
const struct genl_multicast_group *grp,
|
||||
int grp_id, u32 portid, u32 seq, u32 flags,
|
||||
struct sk_buff *skb, u8 cmd)
|
||||
|
|
@ -812,37 +765,30 @@ nla_put_failure:
|
|||
|
||||
static int ctrl_dumpfamily(struct sk_buff *skb, struct netlink_callback *cb)
|
||||
{
|
||||
|
||||
int i, n = 0;
|
||||
int n = 0;
|
||||
struct genl_family *rt;
|
||||
struct net *net = sock_net(skb->sk);
|
||||
int chains_to_skip = cb->args[0];
|
||||
int fams_to_skip = cb->args[1];
|
||||
int fams_to_skip = cb->args[0];
|
||||
unsigned int id;
|
||||
|
||||
for (i = chains_to_skip; i < GENL_FAM_TAB_SIZE; i++) {
|
||||
n = 0;
|
||||
list_for_each_entry(rt, genl_family_chain(i), family_list) {
|
||||
if (!rt->netnsok && !net_eq(net, &init_net))
|
||||
continue;
|
||||
if (++n < fams_to_skip)
|
||||
continue;
|
||||
if (ctrl_fill_info(rt, NETLINK_CB(cb->skb).portid,
|
||||
cb->nlh->nlmsg_seq, NLM_F_MULTI,
|
||||
skb, CTRL_CMD_NEWFAMILY) < 0)
|
||||
goto errout;
|
||||
}
|
||||
idr_for_each_entry(&genl_fam_idr, rt, id) {
|
||||
if (!rt->netnsok && !net_eq(net, &init_net))
|
||||
continue;
|
||||
|
||||
fams_to_skip = 0;
|
||||
if (n++ < fams_to_skip)
|
||||
continue;
|
||||
|
||||
if (ctrl_fill_info(rt, NETLINK_CB(cb->skb).portid,
|
||||
cb->nlh->nlmsg_seq, NLM_F_MULTI,
|
||||
skb, CTRL_CMD_NEWFAMILY) < 0)
|
||||
break;
|
||||
}
|
||||
|
||||
errout:
|
||||
cb->args[0] = i;
|
||||
cb->args[1] = n;
|
||||
|
||||
cb->args[0] = n;
|
||||
return skb->len;
|
||||
}
|
||||
|
||||
static struct sk_buff *ctrl_build_family_msg(struct genl_family *family,
|
||||
static struct sk_buff *ctrl_build_family_msg(const struct genl_family *family,
|
||||
u32 portid, int seq, u8 cmd)
|
||||
{
|
||||
struct sk_buff *skb;
|
||||
|
|
@ -862,7 +808,7 @@ static struct sk_buff *ctrl_build_family_msg(struct genl_family *family,
|
|||
}
|
||||
|
||||
static struct sk_buff *
|
||||
ctrl_build_mcgrp_msg(struct genl_family *family,
|
||||
ctrl_build_mcgrp_msg(const struct genl_family *family,
|
||||
const struct genl_multicast_group *grp,
|
||||
int grp_id, u32 portid, int seq, u8 cmd)
|
||||
{
|
||||
|
|
@ -892,7 +838,7 @@ static const struct nla_policy ctrl_policy[CTRL_ATTR_MAX+1] = {
|
|||
static int ctrl_getfamily(struct sk_buff *skb, struct genl_info *info)
|
||||
{
|
||||
struct sk_buff *msg;
|
||||
struct genl_family *res = NULL;
|
||||
const struct genl_family *res = NULL;
|
||||
int err = -EINVAL;
|
||||
|
||||
if (info->attrs[CTRL_ATTR_FAMILY_ID]) {
|
||||
|
|
@ -936,7 +882,7 @@ static int ctrl_getfamily(struct sk_buff *skb, struct genl_info *info)
|
|||
return genlmsg_reply(msg, info);
|
||||
}
|
||||
|
||||
static int genl_ctrl_event(int event, struct genl_family *family,
|
||||
static int genl_ctrl_event(int event, const struct genl_family *family,
|
||||
const struct genl_multicast_group *grp,
|
||||
int grp_id)
|
||||
{
|
||||
|
|
@ -1005,25 +951,24 @@ static struct genl_family genl_ctrl = {
|
|||
|
||||
static int genl_bind(struct net *net, int group)
|
||||
{
|
||||
int i, err = -ENOENT;
|
||||
struct genl_family *f;
|
||||
int err = -ENOENT;
|
||||
unsigned int id;
|
||||
|
||||
down_read(&cb_lock);
|
||||
for (i = 0; i < GENL_FAM_TAB_SIZE; i++) {
|
||||
struct genl_family *f;
|
||||
|
||||
list_for_each_entry(f, genl_family_chain(i), family_list) {
|
||||
if (group >= f->mcgrp_offset &&
|
||||
group < f->mcgrp_offset + f->n_mcgrps) {
|
||||
int fam_grp = group - f->mcgrp_offset;
|
||||
idr_for_each_entry(&genl_fam_idr, f, id) {
|
||||
if (group >= f->mcgrp_offset &&
|
||||
group < f->mcgrp_offset + f->n_mcgrps) {
|
||||
int fam_grp = group - f->mcgrp_offset;
|
||||
|
||||
if (!f->netnsok && net != &init_net)
|
||||
err = -ENOENT;
|
||||
else if (f->mcast_bind)
|
||||
err = f->mcast_bind(net, fam_grp);
|
||||
else
|
||||
err = 0;
|
||||
break;
|
||||
}
|
||||
if (!f->netnsok && net != &init_net)
|
||||
err = -ENOENT;
|
||||
else if (f->mcast_bind)
|
||||
err = f->mcast_bind(net, fam_grp);
|
||||
else
|
||||
err = 0;
|
||||
break;
|
||||
}
|
||||
}
|
||||
up_read(&cb_lock);
|
||||
|
|
@ -1033,21 +978,19 @@ static int genl_bind(struct net *net, int group)
|
|||
|
||||
static void genl_unbind(struct net *net, int group)
|
||||
{
|
||||
int i;
|
||||
struct genl_family *f;
|
||||
unsigned int id;
|
||||
|
||||
down_read(&cb_lock);
|
||||
for (i = 0; i < GENL_FAM_TAB_SIZE; i++) {
|
||||
struct genl_family *f;
|
||||
|
||||
list_for_each_entry(f, genl_family_chain(i), family_list) {
|
||||
if (group >= f->mcgrp_offset &&
|
||||
group < f->mcgrp_offset + f->n_mcgrps) {
|
||||
int fam_grp = group - f->mcgrp_offset;
|
||||
idr_for_each_entry(&genl_fam_idr, f, id) {
|
||||
if (group >= f->mcgrp_offset &&
|
||||
group < f->mcgrp_offset + f->n_mcgrps) {
|
||||
int fam_grp = group - f->mcgrp_offset;
|
||||
|
||||
if (f->mcast_unbind)
|
||||
f->mcast_unbind(net, fam_grp);
|
||||
break;
|
||||
}
|
||||
if (f->mcast_unbind)
|
||||
f->mcast_unbind(net, fam_grp);
|
||||
break;
|
||||
}
|
||||
}
|
||||
up_read(&cb_lock);
|
||||
|
|
@ -1087,10 +1030,7 @@ static struct pernet_operations genl_pernet_ops = {
|
|||
|
||||
static int __init genl_init(void)
|
||||
{
|
||||
int i, err;
|
||||
|
||||
for (i = 0; i < GENL_FAM_TAB_SIZE; i++)
|
||||
INIT_LIST_HEAD(&family_ht[i]);
|
||||
int err;
|
||||
|
||||
err = genl_register_family(&genl_ctrl);
|
||||
if (err < 0)
|
||||
|
|
@ -1118,7 +1058,7 @@ subsys_initcall(genl_init);
|
|||
* You cannot use this function with a family that has parallel_ops
|
||||
* and you can only use it within (pre/post) doit/dumpit callbacks.
|
||||
*/
|
||||
struct nlattr **genl_family_attrbuf(struct genl_family *family)
|
||||
struct nlattr **genl_family_attrbuf(const struct genl_family *family)
|
||||
{
|
||||
if (!WARN_ON(family->parallel_ops))
|
||||
lockdep_assert_held(&genl_mutex);
|
||||
|
|
@ -1156,8 +1096,9 @@ static int genlmsg_mcast(struct sk_buff *skb, u32 portid, unsigned long group,
|
|||
return err;
|
||||
}
|
||||
|
||||
int genlmsg_multicast_allns(struct genl_family *family, struct sk_buff *skb,
|
||||
u32 portid, unsigned int group, gfp_t flags)
|
||||
int genlmsg_multicast_allns(const struct genl_family *family,
|
||||
struct sk_buff *skb, u32 portid,
|
||||
unsigned int group, gfp_t flags)
|
||||
{
|
||||
if (WARN_ON_ONCE(group >= family->n_mcgrps))
|
||||
return -EINVAL;
|
||||
|
|
@ -1166,7 +1107,7 @@ int genlmsg_multicast_allns(struct genl_family *family, struct sk_buff *skb,
|
|||
}
|
||||
EXPORT_SYMBOL(genlmsg_multicast_allns);
|
||||
|
||||
void genl_notify(struct genl_family *family, struct sk_buff *skb,
|
||||
void genl_notify(const struct genl_family *family, struct sk_buff *skb,
|
||||
struct genl_info *info, u32 group, gfp_t flags)
|
||||
{
|
||||
struct net *net = genl_info_net(info);
|
||||
|
|
|
|||
Загрузка…
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