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netstat: export weight for single-path routes.

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* Parse and export newly-added NL_RTA_WEIGHT attribute, providing path
 weight for a non-multipath route. This fixes a number of tests in
 sys/net/routing which rely on this data.
* Remove handling of NL_RTA_KNH_ID in multipath routes, as it is
 not provided.
* Improve kernel/user nexthop index export. As a result,
 for multipath routes:
  * nhg-kidx attribute represents kernel nhg index (always provided)
  * nhg-uidx attribute represents user-provided nhg index (if set)
 for non-multipath routes:
  * nhop-kidx attribute represents kernel nhop index (always provided)
  * nhop-udx attribute represents user-provided nexthop index (if set)
This commit is contained in:
Alexander V. Chernikov 2023-01-29 16:27:31 +00:00
parent 3ebccb20d5
commit 15dbf5a241
3 changed files with 21 additions and 7 deletions
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1
usr.bin/netstat/common.h
View File

@ -70,6 +70,7 @@ struct ifmap_entry {
};
struct ifmap_entry *prepare_ifmap(size_t *ifmap_size);
extern const uint32_t rt_default_weight;
struct rt_msghdr;
struct nhops_map {

1
usr.bin/netstat/route.c
View File

@ -108,6 +108,7 @@ static void p_rtable_sysctl(int, int);
static void p_rtentry_sysctl(const char *name, struct rt_msghdr *);
static void domask(char *, size_t, u_long);
const uint32_t rt_default_weight = RT_DEFAULT_WEIGHT;
/*
* Print routing tables.

26
usr.bin/netstat/route_netlink.c
View File

@ -150,7 +150,6 @@ struct rta_mpath_nh {
uint8_t rtnh_flags;
uint8_t rtnh_weight;
uint32_t rtax_mtu;
uint32_t rta_knh_id;
uint32_t rta_rtflags;
};
@ -164,7 +163,6 @@ SNL_DECLARE_ATTR_PARSER(metrics_mp_parser, nla_p_mp_rtmetrics);
static const struct snl_attr_parser psnh[] = {
{ .type = NL_RTA_GATEWAY, .off = _OUT(gw), .cb = snl_attr_get_ip },
{ .type = NL_RTA_METRICS, .arg = &metrics_mp_parser, .cb = snl_attr_get_nested },
{ .type = NL_RTA_KNH_ID, .off = _OUT(rta_knh_id), .cb = snl_attr_get_uint32 },
{ .type = NL_RTA_RTFLAGS, .off = _OUT(gw), .cb = snl_attr_get_uint32 },
{ .type = NL_RTA_VIA, .off = _OUT(gw), .cb = snl_attr_get_ipvia },
};
@ -225,6 +223,7 @@ struct nl_parsed_route {
uint32_t rta_expire;
uint32_t rta_table;
uint32_t rta_knh_id;
uint32_t rta_nh_id;
uint32_t rta_rtflags;
uint32_t rtax_mtu;
uint32_t rtax_weight;
@ -248,10 +247,12 @@ static const struct snl_attr_parser ps[] = {
{ .type = NL_RTA_METRICS, .arg = &metrics_parser, .cb = snl_attr_get_nested },
{ .type = NL_RTA_MULTIPATH, .off = _OUT(rta_multipath), .cb = nlattr_get_multipath },
{ .type = NL_RTA_KNH_ID, .off = _OUT(rta_knh_id), .cb = snl_attr_get_uint32 },
{ .type = NL_RTA_WEIGHT, .off = _OUT(rtax_weight), .cb = snl_attr_get_uint32 },
{ .type = NL_RTA_RTFLAGS, .off = _OUT(rta_rtflags), .cb = snl_attr_get_uint32 },
{ .type = NL_RTA_TABLE, .off = _OUT(rta_table), .cb = snl_attr_get_uint32 },
{ .type = NL_RTA_VIA, .off = _OUT(rta_gw), .cb = snl_attr_get_ipvia },
{ .type = NL_RTA_EXPIRES, .off = _OUT(rta_expire), .cb = snl_attr_get_uint32 },
{ .type = NL_RTA_NH_ID, .off = _OUT(rta_nh_id), .cb = snl_attr_get_uint32 },
};
static const struct snl_field_parser fprt[] = {
@ -320,7 +321,7 @@ struct sockaddr_dl_short {
};
static void
p_path(struct nl_parsed_route *rt)
p_path(struct nl_parsed_route *rt, bool is_mpath)
{
struct sockaddr_in6 mask6;
struct sockaddr *pmask = (struct sockaddr *)&mask6;
@ -337,6 +338,16 @@ p_path(struct nl_parsed_route *rt)
p_flags(rt->rta_rtflags | RTF_UP, buffer);
/* Output path weight as non-visual property */
xo_emit("{e:weight/%u}", rt->rtax_weight);
if (is_mpath)
xo_emit("{e:nhg-kidx/%u}", rt->rta_knh_id);
else
xo_emit("{e:nhop-kidx/%u}", rt->rta_knh_id);
if (rt->rta_nh_id != 0) {
if (is_mpath)
xo_emit("{e:nhg-uidx/%u}", rt->rta_nh_id);
else
xo_emit("{e:nhop-uidx/%u}", rt->rta_nh_id);
}
memset(prettyname, 0, sizeof(prettyname));
if (rt->rta_oif < ifmap_size) {
@ -350,7 +361,7 @@ p_path(struct nl_parsed_route *rt)
if (Wflag) {
/* XXX: use=0? */
xo_emit("{t:nhop/%*lu} ", wid.mtu, rt->rta_knh_id);
xo_emit("{t:nhop/%*lu} ", wid.mtu, is_mpath ? 0 : rt->rta_knh_id);
if (rt->rtax_mtu != 0)
xo_emit("{t:mtu/%*lu} ", wid.mtu, rt->rtax_mtu);
@ -378,6 +389,8 @@ p_rtentry_netlink(struct snl_state *ss, const char *name, struct nlmsghdr *hdr)
struct nl_parsed_route rt = {};
if (!snl_parse_nlmsg(ss, hdr, &rtm_parser, &rt))
return;
if (rt.rtax_weight == 0)
rt.rtax_weight = rt_default_weight;
if (rt.rta_multipath != NULL) {
uint32_t orig_rtflags = rt.rta_rtflags;
@ -389,11 +402,10 @@ p_rtentry_netlink(struct snl_state *ss, const char *name, struct nlmsghdr *hdr)
rt.rta_oif = nhop->ifindex;
rt.rtax_weight = nhop->rtnh_weight;
rt.rta_rtflags = nhop->rta_rtflags ? nhop->rta_rtflags : orig_rtflags;
rt.rta_knh_id = nhop->rta_knh_id;
rt.rtax_mtu = nhop->rtax_mtu ? nhop->rtax_mtu : orig_mtu;
xo_open_instance(name);
p_path(&rt);
p_path(&rt, true);
xo_emit("\n");
xo_close_instance(name);
}
@ -409,7 +421,7 @@ p_rtentry_netlink(struct snl_state *ss, const char *name, struct nlmsghdr *hdr)
rt.rta_gw = (struct sockaddr *)&sdl_gw;
xo_open_instance(name);
p_path(&rt);
p_path(&rt, false);
xo_emit("\n");
xo_close_instance(name);
}