forked from luck/tmp_suning_uos_patched
[RTNL]: Message handler registration interface
This patch adds a new interface to register rtnetlink message handlers replacing the exported rtnl_links[] array which required many message handlers to be exported unnecessarly. Signed-off-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
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30833ffead
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e284986385
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@ -574,13 +574,6 @@ extern int rtattr_parse(struct rtattr *tb[], int maxattr, struct rtattr *rta, in
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#define rtattr_parse_nested(tb, max, rta) \
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rtattr_parse((tb), (max), RTA_DATA((rta)), RTA_PAYLOAD((rta)))
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struct rtnetlink_link
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{
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int (*doit)(struct sk_buff *, struct nlmsghdr*, void *attr);
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int (*dumpit)(struct sk_buff *, struct netlink_callback *cb);
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};
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extern struct rtnetlink_link * rtnetlink_links[NPROTO];
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extern int rtnetlink_send(struct sk_buff *skb, u32 pid, u32 group, int echo);
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extern int rtnl_unicast(struct sk_buff *skb, u32 pid);
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extern int rtnl_notify(struct sk_buff *skb, u32 pid, u32 group,
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18
include/net/rtnetlink.h
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18
include/net/rtnetlink.h
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@ -0,0 +1,18 @@
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#ifndef __NET_RTNETLINK_H
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#define __NET_RTNETLINK_H
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#include <linux/rtnetlink.h>
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#include <net/netlink.h>
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typedef int (*rtnl_doit_func)(struct sk_buff *, struct nlmsghdr *, void *);
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typedef int (*rtnl_dumpit_func)(struct sk_buff *, struct netlink_callback *);
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extern int __rtnl_register(int protocol, int msgtype,
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rtnl_doit_func, rtnl_dumpit_func);
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extern void rtnl_register(int protocol, int msgtype,
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rtnl_doit_func, rtnl_dumpit_func);
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extern int rtnl_unregister(int protocol, int msgtype);
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extern void rtnl_unregister_all(int protocol);
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extern int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb);
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#endif
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@ -50,12 +50,18 @@
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#include <net/sock.h>
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#include <net/pkt_sched.h>
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#include <net/fib_rules.h>
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#include <net/netlink.h>
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#include <net/rtnetlink.h>
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#ifdef CONFIG_NET_WIRELESS_RTNETLINK
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#include <linux/wireless.h>
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#include <net/iw_handler.h>
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#endif /* CONFIG_NET_WIRELESS_RTNETLINK */
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struct rtnl_link
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{
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rtnl_doit_func doit;
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rtnl_dumpit_func dumpit;
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};
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static DEFINE_MUTEX(rtnl_mutex);
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static struct sock *rtnl;
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@ -95,7 +101,151 @@ int rtattr_parse(struct rtattr *tb[], int maxattr, struct rtattr *rta, int len)
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return 0;
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}
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struct rtnetlink_link * rtnetlink_links[NPROTO];
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struct rtnl_link *rtnl_msg_handlers[NPROTO];
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static inline int rtm_msgindex(int msgtype)
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{
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int msgindex = msgtype - RTM_BASE;
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/*
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* msgindex < 0 implies someone tried to register a netlink
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* control code. msgindex >= RTM_NR_MSGTYPES may indicate that
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* the message type has not been added to linux/rtnetlink.h
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*/
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BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
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return msgindex;
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}
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static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
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{
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struct rtnl_link *tab;
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tab = rtnl_msg_handlers[protocol];
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if (tab == NULL || tab->doit == NULL)
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tab = rtnl_msg_handlers[PF_UNSPEC];
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return tab ? tab->doit : NULL;
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}
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static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
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{
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struct rtnl_link *tab;
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tab = rtnl_msg_handlers[protocol];
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if (tab == NULL || tab->dumpit == NULL)
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tab = rtnl_msg_handlers[PF_UNSPEC];
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return tab ? tab->dumpit : NULL;
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}
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/**
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* __rtnl_register - Register a rtnetlink message type
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* @protocol: Protocol family or PF_UNSPEC
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* @msgtype: rtnetlink message type
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* @doit: Function pointer called for each request message
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* @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
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*
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* Registers the specified function pointers (at least one of them has
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* to be non-NULL) to be called whenever a request message for the
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* specified protocol family and message type is received.
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*
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* The special protocol family PF_UNSPEC may be used to define fallback
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* function pointers for the case when no entry for the specific protocol
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* family exists.
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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 __rtnl_register(int protocol, int msgtype,
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rtnl_doit_func doit, rtnl_dumpit_func dumpit)
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{
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struct rtnl_link *tab;
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int msgindex;
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BUG_ON(protocol < 0 || protocol >= NPROTO);
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msgindex = rtm_msgindex(msgtype);
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tab = rtnl_msg_handlers[protocol];
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if (tab == NULL) {
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tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
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if (tab == NULL)
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return -ENOBUFS;
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rtnl_msg_handlers[protocol] = tab;
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}
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if (doit)
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tab[msgindex].doit = doit;
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if (dumpit)
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tab[msgindex].dumpit = dumpit;
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return 0;
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}
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EXPORT_SYMBOL_GPL(__rtnl_register);
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/**
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* rtnl_register - Register a rtnetlink message type
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*
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* Identical to __rtnl_register() but panics on failure. This is useful
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* as failure of this function is very unlikely, it can only happen due
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* to lack of memory when allocating the chain to store all message
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* handlers for a protocol. Meant for use in init functions where lack
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* of memory implies no sense in continueing.
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*/
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void rtnl_register(int protocol, int msgtype,
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rtnl_doit_func doit, rtnl_dumpit_func dumpit)
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{
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if (__rtnl_register(protocol, msgtype, doit, dumpit) < 0)
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panic("Unable to register rtnetlink message handler, "
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"protocol = %d, message type = %d\n",
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protocol, msgtype);
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}
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EXPORT_SYMBOL_GPL(rtnl_register);
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/**
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* rtnl_unregister - Unregister a rtnetlink message type
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* @protocol: Protocol family or PF_UNSPEC
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* @msgtype: rtnetlink message type
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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 rtnl_unregister(int protocol, int msgtype)
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{
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int msgindex;
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BUG_ON(protocol < 0 || protocol >= NPROTO);
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msgindex = rtm_msgindex(msgtype);
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if (rtnl_msg_handlers[protocol] == NULL)
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return -ENOENT;
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rtnl_msg_handlers[protocol][msgindex].doit = NULL;
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rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
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return 0;
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}
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EXPORT_SYMBOL_GPL(rtnl_unregister);
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/**
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* rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
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* @protocol : Protocol family or PF_UNSPEC
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*
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* Identical to calling rtnl_unregster() for all registered message types
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* of a certain protocol family.
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*/
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void rtnl_unregister_all(int protocol)
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{
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BUG_ON(protocol < 0 || protocol >= NPROTO);
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kfree(rtnl_msg_handlers[protocol]);
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rtnl_msg_handlers[protocol] = NULL;
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}
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EXPORT_SYMBOL_GPL(rtnl_unregister_all);
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static const int rtm_min[RTM_NR_FAMILIES] =
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{
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@ -648,7 +798,7 @@ static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
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return err;
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}
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static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
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int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
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{
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int idx;
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int s_idx = cb->family;
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@ -659,12 +809,12 @@ static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
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int type = cb->nlh->nlmsg_type-RTM_BASE;
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if (idx < s_idx || idx == PF_PACKET)
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continue;
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if (rtnetlink_links[idx] == NULL ||
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rtnetlink_links[idx][type].dumpit == NULL)
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if (rtnl_msg_handlers[idx] == NULL ||
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rtnl_msg_handlers[idx][type].dumpit == NULL)
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continue;
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if (idx > s_idx)
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memset(&cb->args[0], 0, sizeof(cb->args));
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if (rtnetlink_links[idx][type].dumpit(skb, cb))
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if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
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break;
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}
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cb->family = idx;
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@ -672,6 +822,8 @@ static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
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return skb->len;
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}
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EXPORT_SYMBOL_GPL(rtnl_dump_all);
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void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
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{
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struct sk_buff *skb;
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@ -703,8 +855,7 @@ static int rtattr_max;
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static __inline__ int
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rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
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{
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struct rtnetlink_link *link;
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struct rtnetlink_link *link_tab;
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rtnl_doit_func doit;
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int sz_idx, kind;
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int min_len;
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int family;
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return -1;
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}
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link_tab = rtnetlink_links[family];
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if (link_tab == NULL)
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link_tab = rtnetlink_links[PF_UNSPEC];
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link = &link_tab[type];
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sz_idx = type>>2;
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kind = type&3;
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}
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if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
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if (link->dumpit == NULL)
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link = &(rtnetlink_links[PF_UNSPEC][type]);
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rtnl_dumpit_func dumpit;
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if (link->dumpit == NULL)
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dumpit = rtnl_get_dumpit(family, type);
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if (dumpit == NULL)
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goto err_inval;
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if ((*errp = netlink_dump_start(rtnl, skb, nlh,
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link->dumpit, NULL)) != 0) {
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dumpit, NULL)) != 0) {
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return -1;
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}
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}
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}
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if (link->doit == NULL)
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link = &(rtnetlink_links[PF_UNSPEC][type]);
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if (link->doit == NULL)
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doit = rtnl_get_doit(family, type);
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if (doit == NULL)
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goto err_inval;
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err = link->doit(skb, nlh, (void *)&rta_buf[0]);
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err = doit(skb, nlh, (void *)&rta_buf[0]);
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*errp = err;
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return err;
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@ -886,7 +1031,6 @@ void __init rtnetlink_init(void)
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EXPORT_SYMBOL(__rta_fill);
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EXPORT_SYMBOL(rtattr_strlcpy);
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EXPORT_SYMBOL(rtattr_parse);
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EXPORT_SYMBOL(rtnetlink_links);
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EXPORT_SYMBOL(rtnetlink_put_metrics);
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EXPORT_SYMBOL(rtnl_lock);
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EXPORT_SYMBOL(rtnl_trylock);
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