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zebra: Allow runtime determination of v6 RR semantics

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The linux kernel is getting the same Route Replace semantics
for v6 that v4 uses.  Allow the end-user to know if their
kernel has this ability and if so to specify it so zebra
can take advantage of this.

Why not do auto-detection?  Because you would have to write
code in zebra to add a route then add the same route again
with different nexthops to see if which semantics it is using.
It sure is easier to just add a cli that allows the user to
do it.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
This commit is contained in:
Donald Sharp 2018-05-18 15:41:46 -04:00
parent 29be7d92cc
commit 6b093863ec
3 changed files with 32 additions and 22 deletions
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51
zebra/main.c
View File

@ -75,24 +75,29 @@ int allow_delete = 0;
/* Don't delete kernel route. */
int keep_kernel_mode = 0;
bool v6_rr_semantics = false;
#ifdef HAVE_NETLINK
/* Receive buffer size for netlink socket */
uint32_t nl_rcvbufsize = 4194304;
#endif /* HAVE_NETLINK */
#define OPTION_V6_RR_SEMANTICS 2000
/* Command line options. */
struct option longopts[] = {{"batch", no_argument, NULL, 'b'},
{"allow_delete", no_argument, NULL, 'a'},
{"keep_kernel", no_argument, NULL, 'k'},
{"socket", required_argument, NULL, 'z'},
{"ecmp", required_argument, NULL, 'e'},
{"label_socket", no_argument, NULL, 'l'},
{"retain", no_argument, NULL, 'r'},
struct option longopts[] = {
{"batch", no_argument, NULL, 'b'},
{"allow_delete", no_argument, NULL, 'a'},
{"keep_kernel", no_argument, NULL, 'k'},
{"socket", required_argument, NULL, 'z'},
{"ecmp", required_argument, NULL, 'e'},
{"label_socket", no_argument, NULL, 'l'},
{"retain", no_argument, NULL, 'r'},
#ifdef HAVE_NETLINK
{"vrfwnetns", no_argument, NULL, 'n'},
{"nl-bufsize", required_argument, NULL, 's'},
{"vrfwnetns", no_argument, NULL, 'n'},
{"nl-bufsize", required_argument, NULL, 's'},
{"v6-rr-semantics", no_argument, NULL, OPTION_V6_RR_SEMANTICS},
#endif /* HAVE_NETLINK */
{0}};
{0}};
zebra_capabilities_t _caps_p[] = {
ZCAP_NET_ADMIN, ZCAP_SYS_ADMIN, ZCAP_NET_RAW,
@ -224,21 +229,22 @@ int main(int argc, char **argv)
#endif
,
longopts,
" -b, --batch Runs in batch mode\n"
" -a, --allow_delete Allow other processes to delete zebra routes\n"
" -z, --socket Set path of zebra socket\n"
" -e, --ecmp Specify ECMP to use.\n"
" -l, --label_socket Socket to external label manager\n"
" -k, --keep_kernel Don't delete old routes which installed by zebra.\n"
" -r, --retain When program terminates, retain added route by zebra.\n"
" -b, --batch Runs in batch mode\n"
" -a, --allow_delete Allow other processes to delete zebra routes\n"
" -z, --socket Set path of zebra socket\n"
" -e, --ecmp Specify ECMP to use.\n"
" -l, --label_socket Socket to external label manager\n"
" -k, --keep_kernel Don't delete old routes which installed by zebra.\n"
" -r, --retain When program terminates, retain added route by zebra.\n"
#ifdef HAVE_NETLINK
" -n, --vrfwnetns Set VRF with NetNS\n"
" -s, --nl-bufsize Set netlink receive buffer size\n"
" -n, --vrfwnetns Set VRF with NetNS\n"
" -s, --nl-bufsize Set netlink receive buffer size\n"
" --v6-rr-semantics Use v6 RR semantics\n"
#endif /* HAVE_NETLINK */
#if defined(HANDLE_ZAPI_FUZZING)
" -c <file> Bypass normal startup use this file for tetsting of zapi"
" -c <file> Bypass normal startup use this file for tetsting of zapi"
#endif
);
);
while (1) {
int opt = frr_getopt(argc, argv, NULL);
@ -292,6 +298,9 @@ int main(int argc, char **argv)
logicalrouter_configure_backend(
LOGICALROUTER_BACKEND_OFF);
break;
case OPTION_V6_RR_SEMANTICS:
v6_rr_semantics = true;
break;
#endif /* HAVE_NETLINK */
#if defined(HANDLE_ZAPI_FUZZING)
case 'c':

1
zebra/rib.h
View File

@ -456,4 +456,5 @@ extern void static_config_install_delayed_routes(struct zebra_vrf *zvrf);
extern pid_t pid;
extern bool v6_rr_semantics;
#endif /*_ZEBRA_RIB_H */

2
zebra/rt_netlink.c
View File

@ -1696,7 +1696,7 @@ void kernel_route_rib(struct route_node *rn, struct prefix *p,
assert(old || new);
if (new) {
if (p->family == AF_INET)
if (p->family == AF_INET || v6_rr_semantics)
ret = netlink_route_multipath(RTM_NEWROUTE, p, src_p,
new, (old) ? 1 : 0);
else {