[PATCH] IPv6: Sevaral MLD Fixes

["YOSHIFUJI Hideaki / 吉藤英明" <yoshfuji@linux-ipv6.org>]

Hi,

This patch fixes three points.
 1. Check address in MLD Query if it is acceptable
     - unspecified address for General Query
     - multicast address for Multicast-Address-Specific Queries
    Otherwise, ignore it.
 2. send MLD for link-local addresses (except for link-local scope
    all nodes address).
 3. Don't send MLD for 0(reserved) scope addresses.

Patch is against linux-2.4.20-pre11.

Thanks is advance.

-------------------------------------------------------------------
Patch-Name: Several MLD Fixes
Patch-Id: FIX_2_4_20_pre11_MLD-20021018
Patch-Author: YOSHIFUJI Hideaki / USAGI Project <yoshfuji@linux-ipv6.org>
Credit: YOSHIFUJI Hideaki / USAGI Project <yoshfuji@linux-ipv6.org>
Reference: RFC2710
-------------------------------------------------------------------
Index: include/net/addrconf.h
===================================================================
RCS file: /cvsroot/usagi/usagi-backport/linux24/include/net/addrconf.h,v
retrieving revision 1.1.1.1
diff -u -r1.1.1.1 addrconf.h
--- include/net/addrconf.h	2002/08/20 09:46:45	1.1.1.1
+++ include/net/addrconf.h	2002/10/17 17:55:52
@@ -191,5 +191,21 @@
 	return (addr->s6_addr32[0] & __constant_htonl(0xFF000000)) == __constant_htonl(0xFF000000);
 }
 
+static inline int ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
+{
+	return (addr->s6_addr32[0] == htonl(0xff020000) &&
+		addr->s6_addr32[1] == 0 &&
+		addr->s6_addr32[2] == 0 &&
+		addr->s6_addr32[3] == htonl(0x00000001));
+}
+
+static inline int ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
+{
+	return (addr->s6_addr32[0] == htonl(0xff020000) &&
+		addr->s6_addr32[1] == 0 &&
+		addr->s6_addr32[2] == 0 &&
+		addr->s6_addr32[3] == htonl(0x00000002));
+}
+
 #endif
 #endif
Index: include/net/ipv6.h
===================================================================
RCS file: /cvsroot/usagi/usagi-backport/linux24/include/net/ipv6.h,v
retrieving revision 1.1.1.1
diff -u -r1.1.1.1 ipv6.h
--- include/net/ipv6.h	2002/08/20 09:46:45	1.1.1.1
+++ include/net/ipv6.h	2002/10/17 17:55:52
@@ -74,6 +74,20 @@
 #define IPV6_ADDR_RESERVED	0x2000U	/* reserved address space */
 
 /*
+ *	Addr scopes
+ */
+#ifdef __KERNEL__
+#define IPV6_ADDR_MC_SCOPE(a)	\
+	((a)->s6_addr[1] & 0x0f)	/* nonstandard */
+#define __IPV6_ADDR_SCOPE_INVALID	-1
+#endif
+#define IPV6_ADDR_SCOPE_NODELOCAL	0x01
+#define IPV6_ADDR_SCOPE_LINKLOCAL	0x02
+#define IPV6_ADDR_SCOPE_SITELOCAL	0x05
+#define IPV6_ADDR_SCOPE_ORGLOCAL	0x08
+#define IPV6_ADDR_SCOPE_GLOBAL		0x0e
+
+/*
  *	fragmentation header
  */
 
Index: net/ipv6/mcast.c
===================================================================
RCS file: /cvsroot/usagi/usagi-backport/linux24/net/ipv6/mcast.c,v
retrieving revision 1.1.1.1
retrieving revision 1.1.1.1.32.3
diff -u -r1.1.1.1 -r1.1.1.1.32.3
--- net/ipv6/mcast.c	2002/08/20 09:47:02	1.1.1.1
+++ net/ipv6/mcast.c	2002/10/17 17:53:59	1.1.1.1.32.3
@@ -18,6 +18,9 @@
 /* Changes:
  *
  *	yoshfuji	: fix format of router-alert option
+ *	YOSHIFUJI Hideaki @USAGI:
+ *		- Ignore Queries for invalid addresses.
+ *		- MLD for link-local addresses.
  */
 
 #define __NO_VERSION__
@@ -405,6 +408,7 @@
 	unsigned long resptime;
 	struct inet6_dev *idev;
 	struct icmp6hdr *hdr;
+	int addr_type;
 
 	if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
 		return -EINVAL;
@@ -420,6 +424,11 @@
 	resptime = (resptime<<10)/(1024000/HZ);
 
 	addrp = (struct in6_addr *) (hdr + 1);
+	addr_type = ipv6_addr_type(addrp);
+
+	if (addr_type != IPV6_ADDR_ANY &&
+	    !(addr_type&IPV6_ADDR_MULTICAST))
+		return -EINVAL;
 
 	idev = in6_dev_get(skb->dev);
 
@@ -427,7 +436,7 @@
 		return 0;
 
 	read_lock(&idev->lock);
-	if (ipv6_addr_any(addrp)) {
+	if (addr_type == IPV6_ADDR_ANY) {
 		for (ma = idev->mc_list; ma; ma=ma->next)
 			igmp6_group_queried(ma, resptime);
 	} else {
@@ -566,11 +575,9 @@
 static void igmp6_join_group(struct ifmcaddr6 *ma)
 {
 	unsigned long delay;
-	int addr_type;
-
-	addr_type = ipv6_addr_type(&ma->mca_addr);
 
-	if ((addr_type & (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_LOOPBACK)))
+	if (IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL ||
+	    ipv6_addr_is_ll_all_nodes(&ma->mca_addr))
 		return;
 
 	igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
@@ -592,10 +599,9 @@
 static void igmp6_leave_group(struct ifmcaddr6 *ma)
 {
 	int addr_type;
-
-	addr_type = ipv6_addr_type(&ma->mca_addr);
 
-	if ((addr_type & IPV6_ADDR_LINKLOCAL))
+	if (IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL ||
+	    ipv6_addr_is_ll_all_nodes(&ma->mca_addr))
 		return;
 
 	if (ma->mca_flags & MAF_LAST_REPORTER)