From 25a4adcec4fbbe1b0686712771fdd8ab6bd3d7a0 Mon Sep 17 00:00:00 2001
From: Max Laier <mlaier@FreeBSD.org>
Date: Thu, 26 Feb 2004 04:27:55 +0000
Subject: [PATCH] Bring eventhandler callbacks for pf. This enables pf to track
 dynamic address changes on interfaces (dailup) with the "on
 (<ifname>)"-syntax. This also brings hooks in anticipation of tracking cloned
 interfaces, which will be in future versions of pf.

Approved by: bms(mentor)
---
 sys/net/if.c       |  6 ++++++
 sys/net/if_var.h   | 14 ++++++++++++++
 sys/netinet/in.c   |  5 +++++
 sys/netinet6/in6.c |  3 +++
 4 files changed, 28 insertions(+)

diff --git a/sys/net/if.c b/sys/net/if.c
index 8cea0c4fe5d4..1d412f9e7407 100644
--- a/sys/net/if.c
+++ b/sys/net/if.c
@@ -447,6 +447,8 @@ if_attach(struct ifnet *ifp)
 	if (domains)
 		if_attachdomain1(ifp);
 
+	EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp);
+
 	/* Announce the interface. */
 	rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
 }
@@ -513,6 +515,7 @@ if_detach(struct ifnet *ifp)
 	int i;
 	struct domain *dp;
 
+	EVENTHANDLER_INVOKE(ifnet_departure_event, ifp);
 	/*
 	 * Remove routes and flush queues.
 	 */
@@ -843,6 +846,7 @@ if_clone_attach(struct if_clone *ifc)
 		bitoff = unit - (bytoff << 3);
 		ifc->ifc_units[bytoff] |= (1 << bitoff);
 	}
+	EVENTHANDLER_INVOKE(if_clone_event, ifc);
 }
 
 /*
@@ -1378,6 +1382,7 @@ ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td)
 		if (ifunit(new_name) != NULL)
 			return (EEXIST);
 		
+		EVENTHANDLER_INVOKE(ifnet_departure_event, ifp);
 		/* Announce the departure of the interface. */
 		rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
 
@@ -1404,6 +1409,7 @@ ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td)
 			sdl->sdl_data[--namelen] = 0xff;
 		IFA_UNLOCK(ifa);
 
+		EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp);
 		/* Announce the return of the interface. */
 		rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
 		break;
diff --git a/sys/net/if_var.h b/sys/net/if_var.h
index a2f91789aa3f..5ddd72b63442 100644
--- a/sys/net/if_var.h
+++ b/sys/net/if_var.h
@@ -78,6 +78,7 @@ struct	ether_header;
 
 #ifdef _KERNEL
 #include <sys/mbuf.h>
+#include <sys/eventhandler.h>
 #endif /* _KERNEL */
 #include <sys/lock.h>		/* XXX */
 #include <sys/mutex.h>		/* XXX */
@@ -293,6 +294,19 @@ typedef void if_init_f_t(void *);
 } while (0)
 
 #ifdef _KERNEL
+/* interface address change event */
+typedef void (*ifaddr_event_handler_t)(void *, struct ifnet *);
+EVENTHANDLER_DECLARE(ifaddr_event, ifaddr_event_handler_t);
+/* new interface arrival event */
+typedef void (*ifnet_arrival_event_handler_t)(void *, struct ifnet *);
+EVENTHANDLER_DECLARE(ifnet_arrival_event, ifnet_arrival_event_handler_t);
+/* interface departure event */
+typedef void (*ifnet_departure_event_handler_t)(void *, struct ifnet *);
+EVENTHANDLER_DECLARE(ifnet_departure_event, ifnet_departure_event_handler_t);
+/* interface clone event */
+typedef void (*if_clone_event_handler_t)(void *, struct if_clone *);
+EVENTHANDLER_DECLARE(if_clone_event, if_clone_event_handler_t);
+
 #define	IF_AFDATA_LOCK_INIT(ifp)	\
     mtx_init(&(ifp)->if_afdata_mtx, "if_afdata", NULL, MTX_DEF)
 #define	IF_AFDATA_LOCK(ifp)	mtx_lock(&(ifp)->if_afdata_mtx)
diff --git a/sys/netinet/in.c b/sys/netinet/in.c
index 187ed937f9c1..1873ae4ceeaf 100644
--- a/sys/netinet/in.c
+++ b/sys/netinet/in.c
@@ -363,6 +363,8 @@ in_control(so, cmd, data, ifp, td)
 		    (struct sockaddr_in *) &ifr->ifr_addr, 1);
 		if (error != 0 && iaIsNew)
 			break;
+		if (error == 0)
+			EVENTHANDLER_INVOKE(ifaddr_event, ifp);
 		return (0);
 
 	case SIOCSIFNETMASK:
@@ -405,6 +407,8 @@ in_control(so, cmd, data, ifp, td)
 		if ((ifp->if_flags & IFF_BROADCAST) &&
 		    (ifra->ifra_broadaddr.sin_family == AF_INET))
 			ia->ia_broadaddr = ifra->ifra_broadaddr;
+		if (error == 0)
+			EVENTHANDLER_INVOKE(ifaddr_event, ifp);
 		return (error);
 
 	case SIOCDIFADDR:
@@ -427,6 +431,7 @@ in_control(so, cmd, data, ifp, td)
 			in_pcbpurgeif0(&ripcbinfo, ifp);
 			in_pcbpurgeif0(&udbinfo, ifp);
 		}
+		EVENTHANDLER_INVOKE(ifaddr_event, ifp);
 		error = 0;
 		break;
 
diff --git a/sys/netinet6/in6.c b/sys/netinet6/in6.c
index 801472a9d0b5..4c0dd5bade34 100644
--- a/sys/netinet6/in6.c
+++ b/sys/netinet6/in6.c
@@ -667,6 +667,8 @@ in6_control(so, cmd, data, ifp, td)
 			 */
 			pfxlist_onlink_check();
 		}
+		if (error == 0 && ia)
+			EVENTHANDLER_INVOKE(ifaddr_event, ifp);
 		break;
 	}
 
@@ -714,6 +716,7 @@ in6_control(so, cmd, data, ifp, td)
 
 	  purgeaddr:
 		in6_purgeaddr(&ia->ia_ifa);
+		EVENTHANDLER_INVOKE(ifaddr_event, ifp);
 		break;
 	}