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Merge pull request #2012 from qlyoung/draft-bz-v4goawayflag-00

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zebra: implement draft-bz-v4goawayflag-00
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Russ White 2018-04-01 17:21:43 -04:00 committed by GitHub
commit b755fd3530
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3 changed files with 34 additions and 0 deletions
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9
doc/user/ipv6.rst
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@ -184,6 +184,14 @@ Router Advertisement
no ipv6 nd suppress-ra
ipv6 nd prefix 2001:0DB8:5009::/64
.. index:: [no] ipv6 nd v4 goaway
.. clicmd:: [no] ipv6 nd v4 goaway
Set whether or not to transmit the V4 GoAway option. This option indicates
to the destination that they should disable IPv4 on the link.
Implements draft-bz-v4goawayflag-00.
.. seealso::
@ -191,3 +199,4 @@ Router Advertisement
- :rfc:`4861` (Neighbor Discovery for IP Version 6 (IPv6))
- :rfc:`6275` (Mobility Support in IPv6)
- :rfc:`4191` (Default Router Preferences and More-Specific Routes)
- https://www.ietf.org/id/draft-bz-v4goawayflag-00.txt

22
zebra/rtadv.c
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@ -45,6 +45,8 @@
#include "zebra/zebra_vrf.h"
extern struct zebra_privs_t zserv_privs;
/* currently undefined in icmp6.h */
bool AdvGoAwayFlag;
#if defined(HAVE_RTADV)
@ -224,6 +226,9 @@ static void rtadv_send_packet(int sock, struct interface *ifp)
rtadv->nd_ra_flags_reserved |= ND_RA_FLAG_OTHER;
if (zif->rtadv.AdvHomeAgentFlag)
rtadv->nd_ra_flags_reserved |= ND_RA_FLAG_HOME_AGENT;
if (AdvGoAwayFlag)
rtadv->nd_ra_flags_reserved |= ND_RA_FLAG_V4_GOAWAY;
/* Note that according to Neighbor Discovery (RFC 4861 [18]),
* AdvDefaultLifetime is by default based on the value of
* MaxRtrAdvInterval. AdvDefaultLifetime is used in the Router Lifetime
@ -1495,6 +1500,19 @@ DEFUN (no_ipv6_nd_mtu,
return CMD_SUCCESS;
}
DEFUN (ipv6_nd_v4_goaway,
ipv6_nd_v4_goaway_cmd,
"[no] ipv6 nd v4 goaway",
NO_STR
"Interface IPv6 config commands\n"
"Neighbor discovery\n"
"v4 RA flags\n"
"Set V4 GoAway Flag\n")
{
AdvGoAwayFlag = !strmatch(argv[0]->text, "no");
return CMD_SUCCESS;
}
/* Dump interface ND information to vty. */
static int nd_dump_vty(struct vty *vty, struct interface *ifp)
{
@ -1626,6 +1644,9 @@ static int rtadv_config_write(struct vty *vty, struct interface *ifp)
if (zif->rtadv.AdvLinkMTU)
vty_out(vty, " ipv6 nd mtu %d\n", zif->rtadv.AdvLinkMTU);
if (AdvGoAwayFlag)
vty_out(vty, " ipv6 nd v4 goaway\n");
for (ALL_LIST_ELEMENTS_RO(zif->rtadv.AdvPrefixList, node, rprefix)) {
vty_out(vty, " ipv6 nd prefix %s",
prefix2str(&rprefix->prefix, buf, sizeof(buf)));
@ -1744,6 +1765,7 @@ void rtadv_cmd_init(void)
install_element(INTERFACE_NODE, &no_ipv6_nd_router_preference_cmd);
install_element(INTERFACE_NODE, &ipv6_nd_mtu_cmd);
install_element(INTERFACE_NODE, &no_ipv6_nd_mtu_cmd);
install_element(INTERFACE_NODE, &ipv6_nd_v4_goaway_cmd);
}
static int if_join_all_router(int sock, struct interface *ifp)

3
zebra/rtadv.h
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@ -28,6 +28,9 @@
/* NB: RTADV is defined in zebra/interface.h above */
#if defined(HAVE_RTADV)
/* currently undefined in icmp6.h */
#define ND_RA_FLAG_V4_GOAWAY 0x01
/* Router advertisement prefix. */
struct rtadv_prefix {
/* Prefix to be advertised. */