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authorStephen Hemminger <shemminger@vyatta.com>2010-04-22 15:24:53 -0700
committerDavid S. Miller <davem@davemloft.net>2010-04-22 15:24:53 -0700
commite802af9cabb011f09b9c19a82faef3dd315f27eb (patch)
tree9a8ef1163b9b40fef8860b08ea4dcb4ff3916098 /include
parent9ccb8975940c4ee51161152e37058e3d9e06c62f (diff)
downloadop-kernel-dev-e802af9cabb011f09b9c19a82faef3dd315f27eb.zip
op-kernel-dev-e802af9cabb011f09b9c19a82faef3dd315f27eb.tar.gz
IPv6: Generic TTL Security Mechanism (final version)
This patch adds IPv6 support for RFC5082 Generalized TTL Security Mechanism. Not to users of mapped address; the IPV6 and IPV4 socket options are seperate. The server does have to deal with both IPv4 and IPv6 socket options and the client has to handle the different for each family. On client: int ttl = 255; getaddrinfo(argv[1], argv[2], &hint, &result); for (rp = result; rp != NULL; rp = rp->ai_next) { s = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol); if (s < 0) continue; if (rp->ai_family == AF_INET) { setsockopt(s, IPPROTO_IP, IP_TTL, &ttl, sizeof(ttl)); } else if (rp->ai_family == AF_INET6) { setsockopt(s, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof(ttl))) } if (connect(s, rp->ai_addr, rp->ai_addrlen) == 0) { ... On server: int minttl = 255 - maxhops; getaddrinfo(NULL, port, &hints, &result); for (rp = result; rp != NULL; rp = rp->ai_next) { s = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol); if (s < 0) continue; if (rp->ai_family == AF_INET6) setsockopt(s, IPPROTO_IPV6, IPV6_MINHOPCOUNT, &minttl, sizeof(minttl)); setsockopt(s, IPPROTO_IP, IP_MINTTL, &minttl, sizeof(minttl)); if (bind(s, rp->ai_addr, rp->ai_addrlen) == 0) break ... Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/linux/in6.h3
-rw-r--r--include/linux/ipv6.h1
2 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/in6.h b/include/linux/in6.h
index bd55c6e..9b90cb2 100644
--- a/include/linux/in6.h
+++ b/include/linux/in6.h
@@ -265,6 +265,9 @@ struct in6_flowlabel_req {
#define IPV6_PREFER_SRC_CGA 0x0008
#define IPV6_PREFER_SRC_NONCGA 0x0800
+/* RFC5082: Generalized Ttl Security Mechanism */
+#define IPV6_MINHOPCOUNT 73
+
/*
* Multicast Routing:
* see include/linux/mroute6.h.
diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h
index e0cc9a7..1bdbebf 100644
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h
@@ -348,6 +348,7 @@ struct ipv6_pinfo {
* 010: prefer public address
* 100: prefer care-of address
*/
+ __u8 min_hopcount;
__u8 tclass;
__u32 dst_cookie;
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