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[IPv4] address: Convert address notification to use rtnl_notify()

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Adds support for NLM_F_ECHO allowing applications to easly
see which address have been deleted, added, or promoted.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Graf 2006-08-15 00:33:59 -07:00 committed by David S. Miller
parent dc738dd83e
commit d6062cbbd1
1 changed files with 37 additions and 16 deletions
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53
net/ipv4/devinet.c
View file

@ -88,7 +88,7 @@ static struct nla_policy ifa_ipv4_policy[IFA_MAX+1] __read_mostly = {
[IFA_LABEL] = { .type = NLA_STRING },
};
static void rtmsg_ifa(int event, struct in_ifaddr *);
static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
@ -239,8 +239,8 @@ int inet_addr_onlink(struct in_device *in_dev, u32 a, u32 b)
return 0;
}
static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
int destroy)
static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
int destroy, struct nlmsghdr *nlh, u32 pid)
{
struct in_ifaddr *promote = NULL;
struct in_ifaddr *ifa, *ifa1 = *ifap;
@ -273,7 +273,7 @@ static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
if (!do_promote) {
*ifap1 = ifa->ifa_next;
rtmsg_ifa(RTM_DELADDR, ifa);
rtmsg_ifa(RTM_DELADDR, ifa, nlh, pid);
blocking_notifier_call_chain(&inetaddr_chain,
NETDEV_DOWN, ifa);
inet_free_ifa(ifa);
@ -298,7 +298,7 @@ static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
is valid, it will try to restore deleted routes... Grr.
So that, this order is correct.
*/
rtmsg_ifa(RTM_DELADDR, ifa1);
rtmsg_ifa(RTM_DELADDR, ifa1, nlh, pid);
blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
if (promote) {
@ -310,7 +310,7 @@ static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
}
promote->ifa_flags &= ~IFA_F_SECONDARY;
rtmsg_ifa(RTM_NEWADDR, promote);
rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid);
blocking_notifier_call_chain(&inetaddr_chain,
NETDEV_UP, promote);
for (ifa = promote->ifa_next; ifa; ifa = ifa->ifa_next) {
@ -329,7 +329,14 @@ static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
}
}
static int inet_insert_ifa(struct in_ifaddr *ifa)
static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
int destroy)
{
__inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
}
static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
u32 pid)
{
struct in_device *in_dev = ifa->ifa_dev;
struct in_ifaddr *ifa1, **ifap, **last_primary;
@ -374,12 +381,17 @@ static int inet_insert_ifa(struct in_ifaddr *ifa)
/* Send message first, then call notifier.
Notifier will trigger FIB update, so that
listeners of netlink will know about new ifaddr */
rtmsg_ifa(RTM_NEWADDR, ifa);
rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid);
blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
return 0;
}
static int inet_insert_ifa(struct in_ifaddr *ifa)
{
return __inet_insert_ifa(ifa, NULL, 0);
}
static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
{
struct in_device *in_dev = __in_dev_get_rtnl(dev);
@ -466,7 +478,7 @@ static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg
!inet_ifa_match(nla_get_u32(tb[IFA_ADDRESS]), ifa)))
continue;
inet_del_ifa(in_dev, ifap, 1);
__inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid);
return 0;
}
@ -558,7 +570,7 @@ static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg
if (IS_ERR(ifa))
return PTR_ERR(ifa);
return inet_insert_ifa(ifa);
return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid);
}
/*
@ -1189,18 +1201,27 @@ static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
return skb->len;
}
static void rtmsg_ifa(int event, struct in_ifaddr* ifa)
static void rtmsg_ifa(int event, struct in_ifaddr* ifa, struct nlmsghdr *nlh,
u32 pid)
{
struct sk_buff *skb;
u32 seq = nlh ? nlh->nlmsg_seq : 0;
int err = -ENOBUFS;
skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
if (skb == NULL)
netlink_set_err(rtnl, 0, RTNLGRP_IPV4_IFADDR, ENOBUFS);
else if (inet_fill_ifaddr(skb, ifa, 0, 0, event, 0) < 0) {
goto errout;
err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0);
if (err < 0) {
kfree_skb(skb);
netlink_set_err(rtnl, 0, RTNLGRP_IPV4_IFADDR, EINVAL);
} else
netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV4_IFADDR, GFP_KERNEL);
goto errout;
}
err = rtnl_notify(skb, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
errout:
if (err < 0)
rtnl_set_sk_err(RTNLGRP_IPV4_IFADDR, err);
}
static struct rtnetlink_link inet_rtnetlink_table[RTM_NR_MSGTYPES] = {