[NETLINK]: Set correct pid for ioctl originating netlink events

This patch ensures that netlink events created as a result of programns
using ioctls (such as ifconfig, route etc) contains the correct PID of
those events.
 
Signed-off-by: Jamal Hadi Salim <hadi@cyberus.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/core/rtnetlink.c

@@ -452,7 +452,7 @@ void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
 	if (!skb)
 		return;
 
-	if (rtnetlink_fill_ifinfo(skb, dev, type, 0, 0, change, 0) < 0) {
+	if (rtnetlink_fill_ifinfo(skb, dev, type, current->pid, 0, change, 0) < 0) {
 		kfree_skb(skb);
 		return;
 	}

net/ipv4/devinet.c

@@ -1112,7 +1112,7 @@ static void rtmsg_ifa(int event, struct in_ifaddr* ifa)
 
 	if (!skb)
 		netlink_set_err(rtnl, 0, RTMGRP_IPV4_IFADDR, ENOBUFS);
-	else if (inet_fill_ifaddr(skb, ifa, 0, 0, event, 0) < 0) {
+	else if (inet_fill_ifaddr(skb, ifa, current->pid, 0, event, 0) < 0) {
 		kfree_skb(skb);
 		netlink_set_err(rtnl, 0, RTMGRP_IPV4_IFADDR, EINVAL);
 	} else {

net/ipv4/fib_semantics.c

@@ -276,7 +276,7 @@ void rtmsg_fib(int event, u32 key, struct fib_alias *fa,
 	       struct nlmsghdr *n, struct netlink_skb_parms *req)
 {
 	struct sk_buff *skb;
-	u32 pid = req ? req->pid : 0;
+	u32 pid = req ? req->pid : n->nlmsg_pid;
 	int size = NLMSG_SPACE(sizeof(struct rtmsg)+256);
 
 	skb = alloc_skb(size, GFP_KERNEL);
@@ -1035,7 +1035,7 @@ fib_convert_rtentry(int cmd, struct nlmsghdr *nl, struct rtmsg *rtm,
 	}
 
 	nl->nlmsg_flags = NLM_F_REQUEST;
-	nl->nlmsg_pid = 0;
+	nl->nlmsg_pid = current->pid;
 	nl->nlmsg_seq = 0;
 	nl->nlmsg_len = NLMSG_LENGTH(sizeof(*rtm));
 	if (cmd == SIOCDELRT) {

net/ipv6/addrconf.c

@@ -2873,7 +2873,7 @@ static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
 		netlink_set_err(rtnl, 0, RTMGRP_IPV6_IFADDR, ENOBUFS);
 		return;
 	}
-	if (inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0) < 0) {
+	if (inet6_fill_ifaddr(skb, ifa, current->pid, 0, event, 0) < 0) {
 		kfree_skb(skb);
 		netlink_set_err(rtnl, 0, RTMGRP_IPV6_IFADDR, EINVAL);
 		return;
@@ -3008,7 +3008,7 @@ void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
 		netlink_set_err(rtnl, 0, RTMGRP_IPV6_IFINFO, ENOBUFS);
 		return;
 	}
-	if (inet6_fill_ifinfo(skb, idev, 0, 0, event, 0) < 0) {
+	if (inet6_fill_ifinfo(skb, idev, current->pid, 0, event, 0) < 0) {
 		kfree_skb(skb);
 		netlink_set_err(rtnl, 0, RTMGRP_IPV6_IFINFO, EINVAL);
 		return;
@@ -3065,7 +3065,7 @@ static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 		netlink_set_err(rtnl, 0, RTMGRP_IPV6_PREFIX, ENOBUFS);
 		return;
 	}
-	if (inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0) < 0) {
+	if (inet6_fill_prefix(skb, idev, pinfo, current->pid, 0, event, 0) < 0) {
 		kfree_skb(skb);
 		netlink_set_err(rtnl, 0, RTMGRP_IPV6_PREFIX, EINVAL);
 		return;