diff options
| author | Juliusz Chroboczek <jch@pps.jussieu.fr> | 2012-02-09 17:23:09 +0100 |
|---|---|---|
| committer | Paul Jakma <paul@quagga.net> | 2012-03-25 17:06:54 +0100 |
| commit | d70ab9dcd8f054ebd5f60a29dbbd9b39f9fe7566 (patch) | |
| tree | 2901221e2a01c5079f2dba182f09570e8d7c0f6c | |
| parent | 31e2a19fd2b4aca34b1d2f5e2eb8c9a44b9ea6c9 (diff) | |
babeld: Add support for blackhole routes.
Babel makes use of blackhole routes to prevent routing loops between
overlapping prefixes shortly after a route is retracted (see RFC 6126
sections 2.8 and 3.5.5). This patch adds support for installing such
blackhole routes.
| -rw-r--r-- | babeld/kernel_zebra.c | 64 |
1 files changed, 43 insertions, 21 deletions
diff --git a/babeld/kernel_zebra.c b/babeld/kernel_zebra.c index 1df4217f..d262a86b 100644 --- a/babeld/kernel_zebra.c +++ b/babeld/kernel_zebra.c @@ -186,12 +186,16 @@ kernel_route_add_v4(const unsigned char *pref, unsigned short plen, correctly. */ SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP); - api.nexthop_num = 1; - api.nexthop = &nexthop_pointer; api.ifindex_num = 0; - - SET_FLAG(api.message, ZAPI_MESSAGE_METRIC); - api.metric = metric; + if(metric >= KERNEL_INFINITY) { + api.flags = ZEBRA_FLAG_BLACKHOLE; + api.nexthop_num = 0; + } else { + api.nexthop_num = 1; + api.nexthop = &nexthop_pointer; + SET_FLAG(api.message, ZAPI_MESSAGE_METRIC); + api.metric = metric; + } debugf(BABEL_DEBUG_ROUTE, "adding route (ipv4) to zebra"); return zapi_ipv4_route (ZEBRA_IPV4_ROUTE_ADD, zclient, @@ -226,13 +230,18 @@ kernel_route_add_v6(const unsigned char *pref, unsigned short plen, api.message = 0; api.safi = SAFI_UNICAST; SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP); - api.nexthop_num = 1; - api.nexthop = &nexthop_pointer; - SET_FLAG(api.message, ZAPI_MESSAGE_IFINDEX); - api.ifindex_num = 1; - api.ifindex = &tmp_ifindex; - SET_FLAG(api.message, ZAPI_MESSAGE_METRIC); - api.metric = metric; + if(metric >= KERNEL_INFINITY) { + api.nexthop_num = 0; + api.ifindex_num = 0; + } else { + api.nexthop_num = 1; + api.nexthop = &nexthop_pointer; + SET_FLAG(api.message, ZAPI_MESSAGE_IFINDEX); + api.ifindex_num = 1; + api.ifindex = &tmp_ifindex; + SET_FLAG(api.message, ZAPI_MESSAGE_METRIC); + api.metric = metric; + } debugf(BABEL_DEBUG_ROUTE, "adding route (ipv6) to zebra"); return zapi_ipv6_route (ZEBRA_IPV6_ROUTE_ADD, zclient, @@ -267,11 +276,16 @@ kernel_route_delete_v4(const unsigned char *pref, unsigned short plen, api.message = 0; api.safi = SAFI_UNICAST; SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP); - api.nexthop_num = 1; - api.nexthop = &nexthop_pointer; api.ifindex_num = 0; - SET_FLAG(api.message, ZAPI_MESSAGE_METRIC); - api.metric = metric; + if(metric >= KERNEL_INFINITY) { + api.flags = ZEBRA_FLAG_BLACKHOLE; + api.nexthop_num = 0; + } else { + api.nexthop_num = 1; + api.nexthop = &nexthop_pointer; + SET_FLAG(api.message, ZAPI_MESSAGE_METRIC); + api.metric = metric; + } debugf(BABEL_DEBUG_ROUTE, "removing route (ipv4) to zebra"); return zapi_ipv4_route (ZEBRA_IPV4_ROUTE_DELETE, zclient, @@ -307,11 +321,19 @@ kernel_route_delete_v6(const unsigned char *pref, unsigned short plen, api.message = 0; api.safi = SAFI_UNICAST; SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP); - api.nexthop_num = 1; - api.nexthop = &nexthop_pointer; - SET_FLAG(api.message, ZAPI_MESSAGE_IFINDEX); - api.ifindex_num = 1; - api.ifindex = &tmp_ifindex; + if(metric >= KERNEL_INFINITY) { + api.flags = ZEBRA_FLAG_BLACKHOLE; + api.nexthop_num = 0; + api.ifindex_num = 0; + } else { + api.nexthop_num = 1; + api.nexthop = &nexthop_pointer; + SET_FLAG(api.message, ZAPI_MESSAGE_IFINDEX); + api.ifindex_num = 1; + api.ifindex = &tmp_ifindex; + SET_FLAG(api.message, ZAPI_MESSAGE_METRIC); + api.metric = metric; + } debugf(BABEL_DEBUG_ROUTE, "removing route (ipv6) to zebra"); return zapi_ipv6_route (ZEBRA_IPV6_ROUTE_DELETE, zclient, |