patch-2.1.8 linux/net/ipv6/mcast.c

• Lines: 221
• Date: Sun Nov 3 11:04:46 1996
• Orig file: v2.1.7/linux/net/ipv6/mcast.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v2.1.7/linux/net/ipv6/mcast.c linux/net/ipv6/mcast.c
@@ -0,0 +1,220 @@
+/*
+ *	Multicast support for IPv6
+ *	Linux INET6 implementation 
+ *
+ *	Authors:
+ *	Pedro Roque		<roque@di.fc.ul.pt>	
+ *
+ *	Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c 
+ *
+ *	This program is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU General Public License
+ *      as published by the Free Software Foundation; either version
+ *      2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/sched.h>
+#include <linux/net.h>
+#include <linux/in6.h>
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+
+#include <net/sock.h>
+#include <net/snmp.h>
+
+#include <net/ipv6.h>
+#include <net/protocol.h>
+#include <net/if_inet6.h>
+#include <net/ndisc.h>
+#include <net/ipv6_route.h>
+#include <net/addrconf.h>
+
+
+/*
+ *	socket join on multicast group
+ */
+int ipv6_sock_mc_join(struct sock *sk, struct device *dev, 
+		      struct in6_addr *addr)
+{
+	struct ipv6_mc_socklist *mc_lst;
+	struct ipv6_pinfo *np = &sk->net_pinfo.af_inet6;
+	int err;
+
+	if (!(ipv6_addr_type(addr) & IPV6_ADDR_MULTICAST))
+		return -EINVAL;
+
+	if(!(dev->flags & IFF_MULTICAST))
+		return -EADDRNOTAVAIL;
+
+	mc_lst = (struct ipv6_mc_socklist *) 
+		kmalloc(sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
+
+	if (mc_lst == NULL)
+		return -ENOMEM;
+
+	mc_lst->next = NULL;
+	memcpy(&mc_lst->addr, addr, sizeof(struct in6_addr));
+	mc_lst->dev  = dev;
+
+	/*
+	 *	now add/increase the group membership on the device
+	 */
+
+	err = ipv6_dev_mc_inc(dev, addr);
+
+	if (err)
+	{
+		kfree(mc_lst);
+		return err;
+	}
+
+	mc_lst->next = np->ipv6_mc_list;
+	np->ipv6_mc_list = mc_lst;
+
+	return 0;
+}
+
+/*
+ *	socket leave on multicast group
+ */
+int ipv6_sock_mc_drop(struct sock *sk, struct device *dev, 
+		      struct in6_addr *addr)
+{
+	return 0;
+}
+
+void ipv6_sock_mc_close(struct sock *sk)
+{
+	struct ipv6_pinfo *np = &sk->net_pinfo.af_inet6;
+	struct ipv6_mc_socklist *mc_lst;
+
+	for (mc_lst = np->ipv6_mc_list; mc_lst; )
+	{
+		struct ipv6_mc_socklist *back;
+
+		/*
+		 *	leave group
+		 */
+
+		back = mc_lst;
+		mc_lst = mc_lst->next;
+		kfree(back);
+	}
+}
+
+/*
+ *	device multicast group inc (add if not found)
+ */
+int ipv6_dev_mc_inc(struct device *dev, struct in6_addr *addr)
+{
+	struct ipv6_mc_list *mc;
+	struct inet6_dev    *i6dev;
+	char buf[6];
+	u8 hash;
+	
+	for (i6dev = inet6_dev_lst; i6dev; i6dev=i6dev->next)
+		if (i6dev->dev == dev)
+			break;
+		
+	if (i6dev == NULL)
+	{
+		printk(KERN_DEBUG "ipv6_dev_mc_inc: device not found\n");
+		return -EINVAL;
+	}
+
+	for (mc = i6dev->mc_list; mc; mc = mc->if_next)
+		if (ipv6_addr_cmp(&mc->addr, addr) == 0)
+		{
+			atomic_inc(&mc->users);
+			return 0;
+		}
+
+	/*
+	 *	not found: create a new one.
+	 */
+
+	mc = (struct ipv6_mc_list *) kmalloc(sizeof(struct ipv6_mc_list),
+					     GFP_ATOMIC);
+
+	if (mc == NULL)
+	{
+		return -ENOMEM;
+	}
+
+	memset(mc, 0, sizeof(struct ipv6_mc_list));
+
+	memcpy(&mc->addr, addr, sizeof(struct in6_addr));
+	mc->dev = dev;
+	mc->users = 1;
+
+	hash = ipv6_addr_hash(addr);
+
+	mc->next = inet6_mcast_lst[hash];
+	inet6_mcast_lst[hash] = mc;
+	
+	mc->if_next = i6dev->mc_list;
+	i6dev->mc_list = mc;
+
+	/*
+	 *	multicast mapping is defined in IPv6-over-foo documents
+	 */
+
+	switch (dev->type) {
+	case ARPHRD_ETHER:
+		ipv6_mc_map(addr, buf);
+		dev_mc_add(dev, buf, ETH_ALEN, 0);
+		break;
+		
+	default:
+		printk(KERN_DEBUG "dev_mc_inc: unkown device type\n");
+	}
+	
+
+	/*
+	 *	FIXME: ICMP report handling
+	 */
+
+	return 0;
+}
+
+/*
+ *	device multicast group del
+ */
+int ipv6_dev_mc_dec(struct device *dev, struct in6_addr *addr)
+{
+	return 0;
+}
+
+/*
+ *	check if the interface/address pair is valid
+ */
+int ipv6_chk_mcast_addr(struct device *dev, struct in6_addr *addr)
+{
+	struct ipv6_mc_list *mc;	
+	u8 hash;
+
+	hash = ipv6_addr_hash(addr);
+
+	for (mc = inet6_mcast_lst[hash]; mc; mc=mc->next)
+		if ((mc->dev == dev) &&
+		    ipv6_addr_cmp(&mc->addr, addr) == 0)
+		{
+			return 1;
+		}
+
+	return 0;
+}
+
+/*
+ *	IGMP handling (alias multicast ICMPv6 messages)
+ */
+
+/*
+ * Local variables:
+ *  compile-command: "gcc -D__KERNEL__ -I/usr/src/linux/include -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -fno-strength-reduce -pipe -m486 -DCPU=486 -DMODULE -DMODVERSIONS -include /usr/src/linux/include/linux/modversions.h  -c -o mcast.o mcast.c"
+ * End:
+ */