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

• Lines: 174
• Date: Sun Nov 3 11:04:46 1996
• Orig file: v2.1.7/linux/net/ipv6/exthdrs.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v2.1.7/linux/net/ipv6/exthdrs.c linux/net/ipv6/exthdrs.c
@@ -0,0 +1,173 @@
+/*
+ *	Extension Header handling for IPv6
+ *	Linux INET6 implementation
+ *
+ *	Authors:
+ *	Pedro Roque		<roque@di.fc.ul.pt>
+ *
+ *	$Id: exthdrs.c,v 1.7 1996/09/12 18:44:18 roque Exp $
+ *
+ *	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/netdevice.h>
+#include <linux/in6.h>
+#include <linux/icmpv6.h>
+
+#include <net/sock.h>
+#include <net/snmp.h>
+
+#include <net/ipv6.h>
+#include <net/protocol.h>
+#include <net/transp_v6.h>
+#include <net/rawv6.h>
+#include <net/ndisc.h>
+#include <net/ipv6_route.h>
+#include <net/addrconf.h>
+
+/*
+ *	inbound
+ */
+
+int ipv6_routing_header(struct sk_buff **skb_ptr, struct device *dev,
+			__u8 *nhptr, struct ipv6_options *opt)
+{
+	struct sk_buff *skb = *skb_ptr;
+	struct in6_addr *addr;
+	struct in6_addr daddr;
+	int addr_type = 0;
+	int strict = 0;
+	__u32 bit_map;
+	int pos;
+	int n, i;
+
+	struct ipv6_rt_hdr *hdr = (struct ipv6_rt_hdr *) skb->h.raw;
+	struct rt0_hdr *rthdr;
+
+	if (hdr->segments_left == 0)
+	{
+		struct ipv6_options *opt;
+
+		opt = (struct ipv6_options *) skb->proto_priv;
+		opt->srcrt = hdr;
+
+		skb->h.raw += (hdr->hdrlen + 1) << 3;
+		return hdr->nexthdr;		
+	}
+
+	if (hdr->type != IPV6_SRCRT_TYPE_0 || hdr->hdrlen & 0x01 ||
+	    hdr->hdrlen > 46)
+	{
+                /* 
+		 *	Discard 
+		 */
+		
+		pos = (__u8 *) hdr - (__u8 *) skb->ipv6_hdr + 2;
+
+		if (hdr->type)
+			pos += 2;
+		else
+			pos += 1;
+
+		icmpv6_send(skb, ICMPV6_PARAMETER_PROB, 0, pos, dev);
+		kfree_skb(skb, FREE_READ);
+		return 0;	
+	}
+
+	/*
+	 *	This is the routing header forwarding algorithm from
+	 *	RFC 1883, page 17.
+	 */
+
+	n = hdr->hdrlen >> 1;
+
+	if (hdr->segments_left > n)
+	{
+		pos = (__u8 *) hdr - (__u8 *) skb->ipv6_hdr + 2;
+
+		pos += 3;
+
+		icmpv6_send(skb, ICMPV6_PARAMETER_PROB, 0, pos, dev);
+		kfree_skb(skb, FREE_READ);
+		return 0;
+	}
+
+	i = n - --hdr->segments_left;
+
+	rthdr = (struct rt0_hdr *) hdr;
+	addr = rthdr->addr;
+	addr += i - 1;
+
+	addr_type = ipv6_addr_type(addr);
+
+	if (addr_type == IPV6_ADDR_MULTICAST)
+	{
+		kfree_skb(skb, FREE_READ);
+		return 0;
+	}
+
+	ipv6_addr_copy(&daddr, addr);
+	ipv6_addr_copy(addr, &skb->ipv6_hdr->daddr);
+	ipv6_addr_copy(&skb->ipv6_hdr->daddr, &daddr);
+
+	/*
+	 *	Check Strick Source Route
+	 */
+
+	bit_map = ntohl(rthdr->bitmap);
+
+	if ((bit_map & (1 << i)) == IPV6_SRCRT_STRICT)
+	{
+		strict = 1;
+	}
+
+	ipv6_forward(skb, dev, (strict ? IP6_FW_STRICT : 0) | IP6_FW_SRCRT);
+
+	return 0;
+}
+
+
+/*
+ *	outbound
+ */
+
+int ipv6opt_bld_rthdr(struct sk_buff *skb, struct ipv6_options *opt,
+		      struct in6_addr *addr, int proto)		      
+{
+	struct rt0_hdr *phdr, *ihdr;
+	int hops;
+
+	ihdr = (struct rt0_hdr *) opt->srcrt;
+	
+	phdr = (struct rt0_hdr *) skb_put(skb, (ihdr->rt_hdr.hdrlen + 1) << 3);
+	memcpy(phdr, ihdr, sizeof(struct ipv6_rt_hdr));
+
+	hops = ihdr->rt_hdr.hdrlen >> 1;
+	
+	if (hops > 1)
+	{
+		memcpy(phdr->addr, ihdr->addr + 1,
+		       (hops - 1) * sizeof(struct in6_addr));
+	}
+
+	ipv6_addr_copy(phdr->addr + (hops - 1), addr);
+	
+	phdr->rt_hdr.nexthdr = proto;
+
+	return NEXTHDR_ROUTING;
+}
+
+/*
+ * Local variables:
+ * c-file-style: "Linux"
+ * End:
+ */