patch-2.3.47 linux/net/core/dev_mcast.c

• Lines: 174
• Date: Thu Feb 17 09:18:47 2000
• Orig file: v2.3.46/linux/net/core/dev_mcast.c
• Orig date: Mon Nov 1 13:56:27 1999

diff -u --recursive --new-file v2.3.46/linux/net/core/dev_mcast.c linux/net/core/dev_mcast.c
@@ -71,17 +71,20 @@
 void dev_mc_upload(struct net_device *dev)
 {
 	/* Don't do anything till we up the interface
-	   [dev_open will call this function so the list will
-	    stay sane] */
+	 * [dev_open will call this function so the list will
+	 * stay sane]
+	 */
 
-	if(!(dev->flags&IFF_UP))
+	if (!(dev->flags&IFF_UP))
 		return;
 
 	/*
-	 *	Devices with no set multicast don't get set 
+	 *	Devices with no set multicast or which have been
+	 *	detached don't get set.
 	 */
 
-	if(dev->set_multicast_list==NULL)
+	if (dev->set_multicast_list == NULL ||
+	    !netif_device_present(dev))
 		return;
 
 	read_lock_bh(&dev_mc_lock);
@@ -103,19 +106,20 @@
 	struct dev_mc_list *dmi, **dmip;
 
 	write_lock_bh(&dev_mc_lock);
-	for (dmip=&dev->mc_list; (dmi=*dmip)!=NULL; dmip=&dmi->next) {
+	for (dmip = &dev->mc_list; (dmi = *dmip) != NULL; dmip = &dmi->next) {
 		/*
 		 *	Find the entry we want to delete. The device could
 		 *	have variable length entries so check these too.
 		 */
-		if (memcmp(dmi->dmi_addr,addr,dmi->dmi_addrlen)==0 && alen==dmi->dmi_addrlen) {
+		if (memcmp(dmi->dmi_addr, addr, dmi->dmi_addrlen) == 0 &&
+		    alen == dmi->dmi_addrlen) {
 			if (glbl) {
 				int old_glbl = dmi->dmi_gusers;
 				dmi->dmi_gusers = 0;
 				if (old_glbl == 0)
 					break;
 			}
-			if(--dmi->dmi_users)
+			if (--dmi->dmi_users)
 				goto done;
 
 			/*
@@ -125,7 +129,7 @@
 			dev->mc_count--;
 			write_unlock_bh(&dev_mc_lock);
 
-			kfree_s(dmi,sizeof(*dmi));
+			kfree_s(dmi, sizeof(*dmi));
 
 			/*
 			 *	We have altered the list, so the card
@@ -153,8 +157,9 @@
 	dmi1 = (struct dev_mc_list *)kmalloc(sizeof(*dmi), GFP_ATOMIC);
 
 	write_lock_bh(&dev_mc_lock);
-	for(dmi=dev->mc_list; dmi!=NULL; dmi=dmi->next) {
-		if (memcmp(dmi->dmi_addr,addr,dmi->dmi_addrlen)==0 && dmi->dmi_addrlen==alen) {
+	for (dmi = dev->mc_list; dmi != NULL; dmi = dmi->next) {
+		if (memcmp(dmi->dmi_addr, addr, dmi->dmi_addrlen) == 0 &&
+		    dmi->dmi_addrlen == alen) {
 			if (glbl) {
 				int old_glbl = dmi->dmi_gusers;
 				dmi->dmi_gusers = 1;
@@ -166,16 +171,16 @@
 		}
 	}
 
-	if ((dmi=dmi1)==NULL) {
+	if ((dmi = dmi1) == NULL) {
 		write_unlock_bh(&dev_mc_lock);
 		return -ENOMEM;
 	}
 	memcpy(dmi->dmi_addr, addr, alen);
-	dmi->dmi_addrlen=alen;
-	dmi->next=dev->mc_list;
-	dmi->dmi_users=1;
-	dmi->dmi_gusers=glbl ? 1 : 0;
-	dev->mc_list=dmi;
+	dmi->dmi_addrlen = alen;
+	dmi->next = dev->mc_list;
+	dmi->dmi_users = 1;
+	dmi->dmi_gusers = glbl ? 1 : 0;
+	dev->mc_list = dmi;
 	dev->mc_count++;
 	write_unlock_bh(&dev_mc_lock);
 	dev_mc_upload(dev);
@@ -195,14 +200,14 @@
 void dev_mc_discard(struct net_device *dev)
 {
 	write_lock_bh(&dev_mc_lock);
-	while (dev->mc_list!=NULL) {
-		struct dev_mc_list *tmp=dev->mc_list;
-		dev->mc_list=tmp->next;
+	while (dev->mc_list != NULL) {
+		struct dev_mc_list *tmp = dev->mc_list;
+		dev->mc_list = tmp->next;
 		if (tmp->dmi_users > tmp->dmi_gusers)
 			printk("dev_mc_discard: multicast leakage! dmi_users=%d\n", tmp->dmi_users);
-		kfree_s(tmp,sizeof(*tmp));
+		kfree_s(tmp, sizeof(*tmp));
 	}
-	dev->mc_count=0;
+	dev->mc_count = 0;
 	write_unlock_bh(&dev_mc_lock);
 }
 
@@ -210,9 +215,9 @@
 static int dev_mc_read_proc(char *buffer, char **start, off_t offset,
 			    int length, int *eof, void *data)
 {
-	off_t pos=0, begin=0;
+	off_t pos = 0, begin = 0;
 	struct dev_mc_list *m;
-	int len=0;
+	int len = 0;
 	struct net_device *dev;
 
 	read_lock(&dev_base_lock);
@@ -221,20 +226,20 @@
 		for (m = dev->mc_list; m; m = m->next) {
 			int i;
 
-			len += sprintf(buffer+len,"%-4d %-15s %-5d %-5d ", dev->ifindex, dev->name,
-				       m->dmi_users, m->dmi_gusers);
+			len += sprintf(buffer+len,"%-4d %-15s %-5d %-5d ", dev->ifindex,
+				       dev->name, m->dmi_users, m->dmi_gusers);
 
-			for (i=0; i<m->dmi_addrlen; i++)
+			for (i = 0; i < m->dmi_addrlen; i++)
 				len += sprintf(buffer+len, "%02x", m->dmi_addr[i]);
 
-			len+=sprintf(buffer+len, "\n");
+			len += sprintf(buffer+len, "\n");
 
-			pos=begin+len;
+			pos = begin + len;
 			if (pos < offset) {
-				len=0;
-				begin=pos;
+				len = 0;
+				begin = pos;
 			}
-			if (pos > offset+length) {
+			if (pos > offset + length) {
 				read_unlock_bh(&dev_mc_lock);
 				goto done;
 			}
@@ -245,12 +250,12 @@
 
 done:
 	read_unlock(&dev_base_lock);
-	*start=buffer+(offset-begin);
-	len-=(offset-begin);
-	if(len>length)
-		len=length;
-	if(len<0)
-		len=0;
+	*start = buffer + (offset - begin);
+	len -= (offset - begin);
+	if (len > length)
+		len = length;
+	if (len < 0)
+		len = 0;
 	return len;
 }
 #endif