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Merge pull request #1237 from donaldsharp/distance_special

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zebra: Modify metric read to be admin distance and metric
This commit is contained in:
Renato Westphal 2017-10-09 20:11:39 -03:00 committed by GitHub
commit 09d0f308ce
3 changed files with 33 additions and 10 deletions
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6
zebra/rib.h
View File

@ -71,7 +71,7 @@ struct route_entry {
u_int32_t nexthop_mtu;
/* Distance. */
u_char distance;
uint8_t distance;
/* Flags of this route.
* This flag's definition is in lib/zebra.h ZEBRA_FLAG_* and is exposed
@ -296,7 +296,7 @@ extern int rib_add(afi_t afi, safi_t safi, vrf_id_t vrf_id, int type,
u_short instance, int flags, struct prefix *p,
struct prefix_ipv6 *src_p, const struct nexthop *nh,
u_int32_t table_id, u_int32_t metric, u_int32_t mtu,
u_char distance);
uint8_t distance);
extern int rib_add_multipath(afi_t afi, safi_t safi, struct prefix *,
struct prefix_ipv6 *src_p, struct route_entry *);
@ -330,7 +330,7 @@ extern void rib_unlink(struct route_node *, struct route_entry *);
extern int rib_gc_dest(struct route_node *rn);
extern struct route_table *rib_tables_iter_next(rib_tables_iter_t *iter);
extern u_char route_distance(int type);
extern uint8_t route_distance(int type);
/*
* Inline functions.

31
zebra/rt_netlink.c
View File

@ -277,6 +277,7 @@ static int netlink_route_change_read_unicast(struct sockaddr_nl *snl,
int table;
int metric = 0;
u_int32_t mtu = 0;
uint8_t distance = 0;
void *dest = NULL;
void *gate = NULL;
@ -405,16 +406,38 @@ static int netlink_route_change_read_unicast(struct sockaddr_nl *snl,
return 0;
}
/*
* For ZEBRA_ROUTE_KERNEL types:
*
* The metric/priority of the route received from the kernel
* is a 32 bit number. We are going to interpret the high
* order byte as the Admin Distance and the low order 3 bytes
* as the metric.
*
* This will allow us to do two things:
* 1) Allow the creation of kernel routes that can be
* overridden by zebra.
* 2) Allow the old behavior for 'most' kernel route types
* if a user enters 'ip route ...' v4 routes get a metric
* of 0 and v6 routes get a metric of 1024. Both of these
* values will end up with a admin distance of 0, which
* will cause them to win for the purposes of zebra.
*/
if (proto == ZEBRA_ROUTE_KERNEL) {
distance = (metric >> 24) & 0xFF;
metric = (metric & 0x00FFFFFF);
}
if (IS_ZEBRA_DEBUG_KERNEL) {
char buf[PREFIX_STRLEN];
char buf2[PREFIX_STRLEN];
zlog_debug(
"%s %s%s%s vrf %u", nl_msg_type_to_str(h->nlmsg_type),
"%s %s%s%s vrf %u metric: %d Admin Distance: %d", nl_msg_type_to_str(h->nlmsg_type),
prefix2str(&p, buf, sizeof(buf)),
src_p.prefixlen ? " from " : "",
src_p.prefixlen ? prefix2str(&src_p, buf2, sizeof(buf2))
: "",
vrf_id);
vrf_id, metric, distance);
}
afi_t afi = AFI_IP;
@ -454,7 +477,7 @@ static int netlink_route_change_read_unicast(struct sockaddr_nl *snl,
memcpy(&nh.gate, gate, sz);
rib_add(afi, SAFI_UNICAST, vrf_id, proto,
0, flags, &p, NULL, &nh, table, metric, mtu, 0);
0, flags, &p, NULL, &nh, table, metric, mtu, distance);
} else {
/* This is a multipath route */
@ -466,7 +489,7 @@ static int netlink_route_change_read_unicast(struct sockaddr_nl *snl,
re = XCALLOC(MTYPE_RE, sizeof(struct route_entry));
re->type = proto;
re->distance = 0;
re->distance = distance;
re->flags = flags;
re->metric = metric;
re->mtu = mtu;

6
zebra/zebra_rib.c
View File

@ -129,9 +129,9 @@ _rnode_zlog(const char *_func, vrf_id_t vrf_id, struct route_node *rn,
#define rnode_info(node, ...) \
_rnode_zlog(__func__, vrf_id, node, LOG_INFO, __VA_ARGS__)
u_char route_distance(int type)
uint8_t route_distance(int type)
{
u_char distance;
uint8_t distance;
if ((unsigned)type >= array_size(route_info))
distance = 150;
@ -2463,7 +2463,7 @@ void rib_delete(afi_t afi, safi_t safi, vrf_id_t vrf_id, int type,
int rib_add(afi_t afi, safi_t safi, vrf_id_t vrf_id, int type, u_short instance,
int flags, struct prefix *p, struct prefix_ipv6 *src_p,
const struct nexthop *nh, u_int32_t table_id, u_int32_t metric,
u_int32_t mtu, u_char distance)
u_int32_t mtu, uint8_t distance)
{
struct route_entry *re;
struct nexthop *nexthop;