#include <linux/types.h>
#include <linux/socket.h>
#include <linux/kernel.h>
-#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <net/sock.h>
#include <net/pkt_sched.h>
#include <net/fib_rules.h>
-#include <net/netlink.h>
+#include <net/rtnetlink.h>
#ifdef CONFIG_NET_WIRELESS_RTNETLINK
#include <linux/wireless.h>
#include <net/iw_handler.h>
#endif /* CONFIG_NET_WIRELESS_RTNETLINK */
+struct rtnl_link
+{
+ rtnl_doit_func doit;
+ rtnl_dumpit_func dumpit;
+};
+
static DEFINE_MUTEX(rtnl_mutex);
static struct sock *rtnl;
return 0;
}
-struct rtnetlink_link * rtnetlink_links[NPROTO];
+struct rtnl_link *rtnl_msg_handlers[NPROTO];
+
+static inline int rtm_msgindex(int msgtype)
+{
+ int msgindex = msgtype - RTM_BASE;
+
+ /*
+ * msgindex < 0 implies someone tried to register a netlink
+ * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
+ * the message type has not been added to linux/rtnetlink.h
+ */
+ BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
+
+ return msgindex;
+}
+
+static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
+{
+ struct rtnl_link *tab;
+
+ tab = rtnl_msg_handlers[protocol];
+ if (tab == NULL || tab[msgindex].doit == NULL)
+ tab = rtnl_msg_handlers[PF_UNSPEC];
+
+ return tab ? tab[msgindex].doit : NULL;
+}
+
+static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
+{
+ struct rtnl_link *tab;
+
+ tab = rtnl_msg_handlers[protocol];
+ if (tab == NULL || tab[msgindex].dumpit == NULL)
+ tab = rtnl_msg_handlers[PF_UNSPEC];
+
+ return tab ? tab[msgindex].dumpit : NULL;
+}
+
+/**
+ * __rtnl_register - Register a rtnetlink message type
+ * @protocol: Protocol family or PF_UNSPEC
+ * @msgtype: rtnetlink message type
+ * @doit: Function pointer called for each request message
+ * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
+ *
+ * Registers the specified function pointers (at least one of them has
+ * to be non-NULL) to be called whenever a request message for the
+ * specified protocol family and message type is received.
+ *
+ * The special protocol family PF_UNSPEC may be used to define fallback
+ * function pointers for the case when no entry for the specific protocol
+ * family exists.
+ *
+ * Returns 0 on success or a negative error code.
+ */
+int __rtnl_register(int protocol, int msgtype,
+ rtnl_doit_func doit, rtnl_dumpit_func dumpit)
+{
+ struct rtnl_link *tab;
+ int msgindex;
+
+ BUG_ON(protocol < 0 || protocol >= NPROTO);
+ msgindex = rtm_msgindex(msgtype);
+
+ tab = rtnl_msg_handlers[protocol];
+ if (tab == NULL) {
+ tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
+ if (tab == NULL)
+ return -ENOBUFS;
+
+ rtnl_msg_handlers[protocol] = tab;
+ }
+
+ if (doit)
+ tab[msgindex].doit = doit;
+
+ if (dumpit)
+ tab[msgindex].dumpit = dumpit;
+
+ return 0;
+}
+
+EXPORT_SYMBOL_GPL(__rtnl_register);
+
+/**
+ * rtnl_register - Register a rtnetlink message type
+ *
+ * Identical to __rtnl_register() but panics on failure. This is useful
+ * as failure of this function is very unlikely, it can only happen due
+ * to lack of memory when allocating the chain to store all message
+ * handlers for a protocol. Meant for use in init functions where lack
+ * of memory implies no sense in continueing.
+ */
+void rtnl_register(int protocol, int msgtype,
+ rtnl_doit_func doit, rtnl_dumpit_func dumpit)
+{
+ if (__rtnl_register(protocol, msgtype, doit, dumpit) < 0)
+ panic("Unable to register rtnetlink message handler, "
+ "protocol = %d, message type = %d\n",
+ protocol, msgtype);
+}
+
+EXPORT_SYMBOL_GPL(rtnl_register);
+
+/**
+ * rtnl_unregister - Unregister a rtnetlink message type
+ * @protocol: Protocol family or PF_UNSPEC
+ * @msgtype: rtnetlink message type
+ *
+ * Returns 0 on success or a negative error code.
+ */
+int rtnl_unregister(int protocol, int msgtype)
+{
+ int msgindex;
+
+ BUG_ON(protocol < 0 || protocol >= NPROTO);
+ msgindex = rtm_msgindex(msgtype);
+
+ if (rtnl_msg_handlers[protocol] == NULL)
+ return -ENOENT;
+
+ rtnl_msg_handlers[protocol][msgindex].doit = NULL;
+ rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
+
+ return 0;
+}
+
+EXPORT_SYMBOL_GPL(rtnl_unregister);
+
+/**
+ * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
+ * @protocol : Protocol family or PF_UNSPEC
+ *
+ * Identical to calling rtnl_unregster() for all registered message types
+ * of a certain protocol family.
+ */
+void rtnl_unregister_all(int protocol)
+{
+ BUG_ON(protocol < 0 || protocol >= NPROTO);
+
+ kfree(rtnl_msg_handlers[protocol]);
+ rtnl_msg_handlers[protocol] = NULL;
+}
+
+EXPORT_SYMBOL_GPL(rtnl_unregister_all);
static const int rtm_min[RTM_NR_FAMILIES] =
{
[RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
[RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
[RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)),
- [RTM_FAM(RTM_NEWPREFIX)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
[RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
[RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
};
return nla_nest_cancel(skb, mx);
}
+int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
+ u32 ts, u32 tsage, long expires, u32 error)
+{
+ struct rta_cacheinfo ci = {
+ .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse),
+ .rta_used = dst->__use,
+ .rta_clntref = atomic_read(&(dst->__refcnt)),
+ .rta_error = error,
+ .rta_id = id,
+ .rta_ts = ts,
+ .rta_tsage = tsage,
+ };
+
+ if (expires)
+ ci.rta_expires = jiffies_to_clock_t(expires);
+
+ return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
+}
+
+EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
static void set_operstate(struct net_device *dev, unsigned char transition)
{
a->tx_compressed = b->tx_compressed;
};
+static inline size_t if_nlmsg_size(int iwbuflen)
+{
+ return NLMSG_ALIGN(sizeof(struct ifinfomsg))
+ + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
+ + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
+ + nla_total_size(sizeof(struct rtnl_link_ifmap))
+ + nla_total_size(sizeof(struct rtnl_link_stats))
+ + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
+ + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
+ + nla_total_size(4) /* IFLA_TXQLEN */
+ + nla_total_size(4) /* IFLA_WEIGHT */
+ + nla_total_size(4) /* IFLA_MTU */
+ + nla_total_size(4) /* IFLA_LINK */
+ + nla_total_size(4) /* IFLA_MASTER */
+ + nla_total_size(1) /* IFLA_OPERSTATE */
+ + nla_total_size(1) /* IFLA_LINKMODE */
+ + nla_total_size(iwbuflen);
+}
+
static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
void *iwbuf, int iwbuflen, int type, u32 pid,
u32 seq, u32 change, unsigned int flags)
nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
if (nlh == NULL)
- return -ENOBUFS;
+ return -EMSGSIZE;
ifm = nlmsg_data(nlh);
ifm->ifi_family = AF_UNSPEC;
return nlmsg_end(skb, nlh);
nla_put_failure:
- return nlmsg_cancel(skb, nlh);
+ nlmsg_cancel(skb, nlh);
+ return -EMSGSIZE;
}
static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
struct sk_buff *nskb;
char *iw_buf = NULL, *iw = NULL;
int iw_buf_len = 0;
- int err, payload;
+ int err;
err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
if (err < 0)
if (err < 0)
goto errout;
- iw += IW_EV_POINT_OFF;
+ /* Payload is at an offset in buffer */
+ iw = iw_buf + IW_EV_POINT_OFF;
}
#endif /* CONFIG_NET_WIRELESS_RTNETLINK */
- payload = NLMSG_ALIGN(sizeof(struct ifinfomsg) +
- nla_total_size(iw_buf_len));
- nskb = nlmsg_new(nlmsg_total_size(payload), GFP_KERNEL);
+ nskb = nlmsg_new(if_nlmsg_size(iw_buf_len), GFP_KERNEL);
if (nskb == NULL) {
err = -ENOBUFS;
goto errout;
err = rtnl_fill_ifinfo(nskb, dev, iw, iw_buf_len, RTM_NEWLINK,
NETLINK_CB(skb).pid, nlh->nlmsg_seq, 0, 0);
- if (err <= 0) {
+ if (err < 0) {
+ /* -EMSGSIZE implies BUG in if_nlmsg_size */
+ WARN_ON(err == -EMSGSIZE);
kfree_skb(nskb);
goto errout;
}
-
err = rtnl_unicast(nskb, NETLINK_CB(skb).pid);
errout:
kfree(iw_buf);
return err;
}
-static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
+int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
{
int idx;
int s_idx = cb->family;
int type = cb->nlh->nlmsg_type-RTM_BASE;
if (idx < s_idx || idx == PF_PACKET)
continue;
- if (rtnetlink_links[idx] == NULL ||
- rtnetlink_links[idx][type].dumpit == NULL)
+ if (rtnl_msg_handlers[idx] == NULL ||
+ rtnl_msg_handlers[idx][type].dumpit == NULL)
continue;
if (idx > s_idx)
memset(&cb->args[0], 0, sizeof(cb->args));
- if (rtnetlink_links[idx][type].dumpit(skb, cb))
+ if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
break;
}
cb->family = idx;
return skb->len;
}
+EXPORT_SYMBOL_GPL(rtnl_dump_all);
+
void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
{
struct sk_buff *skb;
int err = -ENOBUFS;
- skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+ skb = nlmsg_new(if_nlmsg_size(0), GFP_KERNEL);
if (skb == NULL)
goto errout;
err = rtnl_fill_ifinfo(skb, dev, NULL, 0, type, 0, 0, change, 0);
if (err < 0) {
+ /* -EMSGSIZE implies BUG in if_nlmsg_size() */
+ WARN_ON(err == -EMSGSIZE);
kfree_skb(skb);
goto errout;
}
-
err = rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
errout:
if (err < 0)
static __inline__ int
rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
{
- struct rtnetlink_link *link;
- struct rtnetlink_link *link_tab;
+ rtnl_doit_func doit;
int sz_idx, kind;
int min_len;
int family;
int type;
int err;
- /* Only requests are handled by kernel now */
- if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
- return 0;
-
type = nlh->nlmsg_type;
- /* A control message: ignore them */
- if (type < RTM_BASE)
- return 0;
-
/* Unknown message: reply with EINVAL */
if (type > RTM_MAX)
goto err_inval;
return -1;
}
- link_tab = rtnetlink_links[family];
- if (link_tab == NULL)
- link_tab = rtnetlink_links[PF_UNSPEC];
- link = &link_tab[type];
-
sz_idx = type>>2;
kind = type&3;
}
if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
- if (link->dumpit == NULL)
- link = &(rtnetlink_links[PF_UNSPEC][type]);
+ rtnl_dumpit_func dumpit;
- if (link->dumpit == NULL)
+ dumpit = rtnl_get_dumpit(family, type);
+ if (dumpit == NULL)
goto err_inval;
if ((*errp = netlink_dump_start(rtnl, skb, nlh,
- link->dumpit, NULL)) != 0) {
+ dumpit, NULL)) != 0) {
return -1;
}
}
}
- if (link->doit == NULL)
- link = &(rtnetlink_links[PF_UNSPEC][type]);
- if (link->doit == NULL)
+ doit = rtnl_get_doit(family, type);
+ if (doit == NULL)
goto err_inval;
- err = link->doit(skb, nlh, (void *)&rta_buf[0]);
+ err = doit(skb, nlh, (void *)&rta_buf[0]);
*errp = err;
return err;
} while (qlen);
}
-static struct rtnetlink_link link_rtnetlink_table[RTM_NR_MSGTYPES] =
-{
- [RTM_GETLINK - RTM_BASE] = { .doit = rtnl_getlink,
- .dumpit = rtnl_dump_ifinfo },
- [RTM_SETLINK - RTM_BASE] = { .doit = rtnl_setlink },
- [RTM_GETADDR - RTM_BASE] = { .dumpit = rtnl_dump_all },
- [RTM_GETROUTE - RTM_BASE] = { .dumpit = rtnl_dump_all },
- [RTM_NEWNEIGH - RTM_BASE] = { .doit = neigh_add },
- [RTM_DELNEIGH - RTM_BASE] = { .doit = neigh_delete },
- [RTM_GETNEIGH - RTM_BASE] = { .dumpit = neigh_dump_info },
-#ifdef CONFIG_FIB_RULES
- [RTM_NEWRULE - RTM_BASE] = { .doit = fib_nl_newrule },
- [RTM_DELRULE - RTM_BASE] = { .doit = fib_nl_delrule },
-#endif
- [RTM_GETRULE - RTM_BASE] = { .dumpit = rtnl_dump_all },
- [RTM_GETNEIGHTBL - RTM_BASE] = { .dumpit = neightbl_dump_info },
- [RTM_SETNEIGHTBL - RTM_BASE] = { .doit = neightbl_set },
-};
-
static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
{
struct net_device *dev = ptr;
panic("rtnetlink_init: cannot allocate rta_buf\n");
rtnl = netlink_kernel_create(NETLINK_ROUTE, RTNLGRP_MAX, rtnetlink_rcv,
- THIS_MODULE);
+ THIS_MODULE);
if (rtnl == NULL)
panic("rtnetlink_init: cannot initialize rtnetlink\n");
netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
register_netdevice_notifier(&rtnetlink_dev_notifier);
- rtnetlink_links[PF_UNSPEC] = link_rtnetlink_table;
- rtnetlink_links[PF_PACKET] = link_rtnetlink_table;
+
+ rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo);
+ rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL);
+
+ rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all);
+ rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all);
}
EXPORT_SYMBOL(__rta_fill);
EXPORT_SYMBOL(rtattr_strlcpy);
EXPORT_SYMBOL(rtattr_parse);
-EXPORT_SYMBOL(rtnetlink_links);
EXPORT_SYMBOL(rtnetlink_put_metrics);
EXPORT_SYMBOL(rtnl_lock);
EXPORT_SYMBOL(rtnl_trylock);
git://bbs.cooldavid.org / net-next-2.6.git / blobdiff