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usr.bin/netstat/nhgrp.c

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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2020 Alexander V. Chernikov
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/route.h>
#include <net/route/nhop.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <libutil.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>
#include <err.h>
#include <libxo/xo.h>
#include "netstat.h"
#include "common.h"
#define WID_GW_DEFAULT(af) (((af) == AF_INET6) ? 40 : 18)
static int wid_gw;
static int wid_if = 10;
static int wid_nhidx = 8;
static int wid_refcnt = 8;
struct nhop_entry {
char gw[64];
char ifname[IFNAMSIZ];
};
struct nhop_map {
struct nhop_entry *ptr;
size_t size;
};
static struct nhop_map global_nhop_map;
static struct ifmap_entry *ifmap;
static size_t ifmap_size;
static struct nhop_entry *
nhop_get(struct nhop_map *map, uint32_t idx)
{
if (idx >= map->size)
return (NULL);
if (*map->ptr[idx].ifname == '\0')
return (NULL);
return &map->ptr[idx];
}
static void
print_nhgroup_header(int af1 __unused)
{
xo_emit("{T:/%-*.*s}{T:/%-*.*s}{T:/%*.*s}{T:/%*.*s}{T:/%*.*s}"
"{T:/%*.*s}{T:/%*s}\n",
wid_nhidx, wid_nhidx, "GrpIdx",
wid_nhidx, wid_nhidx, "NhIdx",
wid_nhidx, wid_nhidx, "Weight",
wid_nhidx, wid_nhidx, "Slots",
wid_gw, wid_gw, "Gateway",
wid_if, wid_if, "Netif",
wid_refcnt, "Refcnt");
}
static void
print_padding(char sym, int len)
{
char buffer[56];
memset(buffer, sym, sizeof(buffer));
buffer[0] = '{';
buffer[1] = 'P';
buffer[2] = ':';
buffer[3] = ' ';
buffer[len + 3] = '}';
buffer[len + 4] = '\0';
xo_emit(buffer);
}
static void
print_nhgroup_entry_sysctl(const char *name, struct rt_msghdr *rtm,
struct nhgrp_external *nhge)
{
char buffer[128];
struct nhop_entry *ne;
struct nhgrp_nhop_external *ext_cp, *ext_dp;
struct nhgrp_container *nhg_cp, *nhg_dp;
nhg_cp = (struct nhgrp_container *)(nhge + 1);
if (nhg_cp->nhgc_type != NHG_C_TYPE_CNHOPS || nhg_cp->nhgc_subtype != 0)
return;
ext_cp = (struct nhgrp_nhop_external *)(nhg_cp + 1);
nhg_dp = (struct nhgrp_container *)((char *)nhg_cp + nhg_cp->nhgc_len);
if (nhg_dp->nhgc_type != NHG_C_TYPE_DNHOPS || nhg_dp->nhgc_subtype != 0)
return;
ext_dp = (struct nhgrp_nhop_external *)(nhg_dp + 1);
xo_open_instance(name);
snprintf(buffer, sizeof(buffer), "{[:-%d}{:nhgrp-index/%%lu}{]:} ", wid_nhidx);
xo_emit(buffer, nhge->nhg_idx);
/* nhidx */
print_padding('-', wid_nhidx);
/* weight */
print_padding('-', wid_nhidx);
/* slots */
print_padding('-', wid_nhidx);
print_padding('-', wid_gw);
print_padding('-', wid_if);
xo_emit("{t:nhg-refcnt/%*lu}", wid_refcnt, nhge->nhg_refcount);
xo_emit("\n");
xo_open_list("nhop-weights");
for (uint32_t i = 0; i < nhg_cp->nhgc_count; i++) {
/* TODO: optimize slots calculations */
uint32_t slots = 0;
for (uint32_t sidx = 0; sidx < nhg_dp->nhgc_count; sidx++) {
if (ext_dp[sidx].nh_idx == ext_cp[i].nh_idx)
slots++;
}
xo_open_instance("nhop-weight");
print_padding(' ', wid_nhidx);
// nh index
xo_emit("{t:nh-index/%*lu}", wid_nhidx, ext_cp[i].nh_idx);
xo_emit("{t:nh-weight/%*lu}", wid_nhidx, ext_cp[i].nh_weight);
xo_emit("{t:nh-slots/%*lu}", wid_nhidx, slots);
ne = nhop_get(&global_nhop_map, ext_cp[i].nh_idx);
if (ne != NULL) {
xo_emit("{t:nh-gw/%*.*s}", wid_gw, wid_gw, ne->gw);
xo_emit("{t:nh-interface/%*.*s}", wid_if, wid_if, ne->ifname);
}
xo_emit("\n");
xo_close_instance("nhop-weight");
}
xo_close_list("nhop-weights");
xo_close_instance(name);
}
static int
cmp_nhg_idx(const void *_a, const void *_b)
{
const struct nhops_map *a, *b;
a = _a;
b = _b;
if (a->idx > b->idx)
return (1);
else if (a->idx < b->idx)
return (-1);
return (0);
}
olivierUnsubmitted
Not Done
Inline Actions

I have a build error here:

--- all_subdir_usr.bin/netstat ---
/usr/src/usr.bin/netstat/nhgrp.c:193:11: error: use of undeclared identifier 'NET_RT_NHGROUPS'
        mib[4] = NET_RT_NHGROUPS;
olivier: I have a build error here: ``` --- all_subdir_usr.bin/netstat --- /usr/src/usr.
melifaroAuthorUnsubmitted
Done
Inline Actions

Should be fixed now.

melifaro: Should be fixed now.
static void
dump_nhgrp_sysctl(int fibnum, int af, struct nhops_dump *nd)
{
size_t needed;
int mib[7];
char *buf, *next, *lim;
struct rt_msghdr *rtm;
struct nhgrp_external *nhg;
struct nhops_map *nhg_map;
size_t nhg_count, nhg_size;
mib[0] = CTL_NET;
mib[1] = PF_ROUTE;
mib[2] = 0;
mib[3] = af;
mib[4] = NET_RT_NHGRP;
mib[5] = 0;
mib[6] = fibnum;
if (sysctl(mib, nitems(mib), NULL, &needed, NULL, 0) < 0)
err(EX_OSERR, "sysctl: net.route.0.%d.nhgrpdump.%d estimate",
af, fibnum);
if ((buf = malloc(needed)) == NULL)
errx(2, "malloc(%lu)", (unsigned long)needed);
if (sysctl(mib, nitems(mib), buf, &needed, NULL, 0) < 0)
err(1, "sysctl: net.route.0.%d.nhgrpdump.%d", af, fibnum);
lim = buf + needed;
/*
* nexhops groups are received unsorted. Collect everything first,
* and sort prior displaying.
*/
nhg_count = 0;
nhg_size = 16;
nhg_map = calloc(nhg_size, sizeof(struct nhops_map));
for (next = buf; next < lim; next += rtm->rtm_msglen) {
rtm = (struct rt_msghdr *)next;
if (rtm->rtm_version != RTM_VERSION)
continue;
if (nhg_count >= nhg_size) {
nhg_size *= 2;
nhg_map = realloc(nhg_map, nhg_size * sizeof(struct nhops_map));
}
nhg = (struct nhgrp_external *)(rtm + 1);
nhg_map[nhg_count].idx = nhg->nhg_idx;
nhg_map[nhg_count].rtm = rtm;
nhg_count++;
}
if (nhg_count > 0)
qsort(nhg_map, nhg_count, sizeof(struct nhops_map), cmp_nhg_idx);
nd->nh_buf = buf;
nd->nh_count = nhg_count;
nd->nh_map = nhg_map;
}
static void
print_nhgrp_sysctl(int fibnum, int af)
{
struct nhops_dump nd;
struct nhgrp_external *nhg;
struct rt_msghdr *rtm;
dump_nhgrp_sysctl(fibnum, af, &nd);
xo_open_container("nhgrp-table");
xo_open_list("rt-family");
if (nd.nh_count > 0) {
wid_gw = WID_GW_DEFAULT(af);
xo_open_instance("rt-family");
pr_family(af);
xo_open_list("nhgrp-entry");
print_nhgroup_header(af);
for (size_t i = 0; i < nd.nh_count; i++) {
rtm = nd.nh_map[i].rtm;
nhg = (struct nhgrp_external *)(rtm + 1);
print_nhgroup_entry_sysctl("nhgrp-entry", rtm, nhg);
}
}
xo_close_list("rt-family");
xo_close_container("nhgrp-table");
free(nd.nh_buf);
}
static void
update_global_map(struct nhop_external *nh)
{
char iface_name[128];
char gw_addr[64];
struct nhop_addrs *na;
struct sockaddr *sa_gw;
na = (struct nhop_addrs *)((char *)nh + nh->nh_len);
sa_gw = (struct sockaddr *)((char *)na + na->gw_sa_off);
memset(iface_name, 0, sizeof(iface_name));
if (nh->ifindex < (uint32_t)ifmap_size) {
strlcpy(iface_name, ifmap[nh->ifindex].ifname,
sizeof(iface_name));
if (*iface_name == '\0')
strlcpy(iface_name, "---", sizeof(iface_name));
}
if (nh->nh_flags & NHF_GATEWAY) {
const char *cp;
cp = fmt_sockaddr(sa_gw, NULL, RTF_HOST);
strlcpy(gw_addr, cp, sizeof(gw_addr));
} else
snprintf(gw_addr, sizeof(gw_addr), "%s/resolve", iface_name);
nhop_map_update(&global_nhop_map, nh->nh_idx, gw_addr, iface_name);
}
static void
prepare_nh_map(int fibnum, int af)
{
struct nhops_dump nd;
struct nhop_external *nh;
struct rt_msghdr *rtm;
dump_nhops_sysctl(fibnum, af, &nd);
for (size_t i = 0; i < nd.nh_count; i++) {
rtm = nd.nh_map[i].rtm;
nh = (struct nhop_external *)(rtm + 1);
update_global_map(nh);
}
free(nd.nh_buf);
}
void
nhgrp_print(int fibnum, int af)
{
size_t intsize;
int numfibs;
intsize = sizeof(int);
if (fibnum == -1 &&
sysctlbyname("net.my_fibnum", &fibnum, &intsize, NULL, 0) == -1)
fibnum = 0;
if (sysctlbyname("net.fibs", &numfibs, &intsize, NULL, 0) == -1)
numfibs = 1;
if (fibnum < 0 || fibnum > numfibs - 1)
errx(EX_USAGE, "%d: invalid fib", fibnum);
ifmap = prepare_ifmap(&ifmap_size);
prepare_nh_map(fibnum, af);
xo_open_container("route-nhgrp-information");
xo_emit("{T:Nexthop groups data}");
if (fibnum)
xo_emit(" ({L:fib}: {:fib/%d})", fibnum);
xo_emit("\n");
print_nhgrp_sysctl(fibnum, af);
xo_close_container("route-nhgrp-information");
}