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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1983, 1988, 1993
* The Regents of the University of California. All rights reserved.
*
* 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.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*
* $FreeBSD$
*/
#include <sys/cdefs.h>
#include <sys/param.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
#include <sys/time.h>
#include <net/ethernet.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 <netgraph/ng_socket.h>
#include <arpa/inet.h>
#include <ifaddrs.h>
#include <libutil.h>
#include <netdb.h>
#include <stdbool.h>
#include <stdint.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"
/* column widths; each followed by one space */
#ifndef INET6
#define WID_DST_DEFAULT(af) 18 /* width of destination column */
#define WID_GW_DEFAULT(af) 18 /* width of gateway column */
#define WID_IF_DEFAULT(af) (Wflag ? 10 : 8) /* width of netif column */
#else
#define WID_DST_DEFAULT(af) \
((af) == AF_INET6 ? (numeric_addr ? 33: 18) : 18)
#define WID_GW_DEFAULT(af) \
((af) == AF_INET6 ? (numeric_addr ? 29 : 18) : 18)
#define WID_IF_DEFAULT(af) ((af) == AF_INET6 ? 8 : (Wflag ? 10 : 8))
#endif /*INET6*/
static int wid_dst;
static int wid_gw;
static int wid_flags;
static int wid_pksent;
static int wid_mtu;
static int wid_if;
static int wid_nhidx;
static int wid_nhtype;
static int wid_refcnt;
static int wid_prepend;
static struct bits nh_bits[] = {
{ NHF_REJECT, 'R', "reject" },
{ NHF_BLACKHOLE,'B', "blackhole" },
{ NHF_REDIRECT, 'r', "redirect" },
{ NHF_GATEWAY, 'G', "gateway" },
{ NHF_DEFAULT, 'd', "default" },
{ NHF_BROADCAST,'b', "broadcast" },
{ 0 , 0, NULL }
};
static char *nh_types[] = {
"empty", /* 0 */
"v4/resolve", /* 1 */
"v4/gw",
"v6/resolve",
"v6/gw"
};
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 void nhop_map_update(struct nhop_map *map, uint32_t idx,
char *gw, char *ifname);
static struct nhop_entry *nhop_get(struct nhop_map *map, uint32_t idx);
static struct ifmap_entry *ifmap;
static size_t ifmap_size;
static void
print_sockaddr_buf(char *buf, size_t bufsize, const struct sockaddr *sa)
{
switch (sa->sa_family) {
case AF_INET:
inet_ntop(AF_INET, &((struct sockaddr_in *)sa)->sin_addr,
buf, bufsize);
break;
case AF_INET6:
inet_ntop(AF_INET6, &((struct sockaddr_in6 *)sa)->sin6_addr,
buf, bufsize);
break;
default:
snprintf(buf, bufsize, "unknown:%d", sa->sa_family);
break;
}
}
static int
print_addr(const char *name, const char *addr, int width)
{
char buf[128];
int protrusion;
if (width < 0) {
snprintf(buf, sizeof(buf), "{:%s/%%s} ", name);
xo_emit(buf, addr);
protrusion = 0;
} else {
if (Wflag != 0 || numeric_addr) {
snprintf(buf, sizeof(buf), "{[:%d}{:%s/%%s}{]:} ",
-width, name);
xo_emit(buf, addr);
protrusion = strlen(addr) - width;
if (protrusion < 0)
protrusion = 0;
} else {
snprintf(buf, sizeof(buf), "{[:%d}{:%s/%%-.*s}{]:} ",
-width, name);
xo_emit(buf, width, addr);
protrusion = 0;
}
}
return (protrusion);
}
static void
print_nhop_header(int af1 __unused)
{
if (Wflag) {
xo_emit("{T:/%-*.*s} {T:/%-*.*s} {T:/%-*.*s} {T:/%-*.*s} {T:/%*.*s} "
"{T:/%*.*s} {T:/%-*.*s} {T:/%*.*s} {T:/%*.*s} {T:/%*.*s} {T:/%*s}\n",
wid_nhidx, wid_nhidx, "Idx",
wid_nhtype, wid_nhtype, "Type",
wid_dst, wid_dst, "IFA",
wid_gw, wid_gw, "Gateway",
wid_flags, wid_flags, "Flags",
wid_pksent, wid_pksent, "Use",
wid_mtu, wid_mtu, "Mtu",
wid_if, wid_if, "Netif",
wid_if, wid_if, "Addrif",
wid_refcnt, wid_refcnt, "Refcnt",
wid_prepend, "Prepend");
} else {
xo_emit("{T:/%-*.*s} {T:/%-*.*s} {T:/%-*.*s} {T:/%-*.*s} {T:/%*.*s} "
" {T:/%*s}\n",
wid_nhidx, wid_nhidx, "Idx",
wid_dst, wid_dst, "IFA",
wid_gw, wid_gw, "Gateway",
wid_flags, wid_flags, "Flags",
wid_if, wid_if, "Netif",
wid_prepend, "Refcnt");
}
}
static void
nhop_map_update(struct nhop_map *map, uint32_t idx, char *gw, char *ifname)
{
if (idx >= map->size) {
uint32_t new_size;
size_t sz;
if (map->size == 0)
new_size = 32;
else
new_size = map->size * 2;
if (new_size <= idx)
new_size = roundup(idx + 1, 32);
sz = new_size * (sizeof(struct nhop_entry));
if ((map->ptr = realloc(map->ptr, sz)) == NULL)
errx(2, "realloc(%lu) failed", sz);
memset(&map->ptr[map->size], 0, (new_size - map->size) * sizeof(struct nhop_entry));
map->size = new_size;
}
strlcpy(map->ptr[idx].ifname, ifname, sizeof(map->ptr[idx].ifname));
strlcpy(map->ptr[idx].gw, gw, sizeof(map->ptr[idx].gw));
}
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_nhop_entry_sysctl(const char *name, struct rt_msghdr *rtm, struct nhop_external *nh)
{
char buffer[128];
char iface_name[128];
int protrusion;
char gw_addr[64];
struct nhop_addrs *na;
struct sockaddr *sa_gw, *sa_ifa;
xo_open_instance(name);
snprintf(buffer, sizeof(buffer), "{[:-%d}{:index/%%lu}{]:} ", wid_nhidx);
//xo_emit("{t:index/%-lu} ", wid_nhidx, nh->nh_idx);
xo_emit(buffer, nh->nh_idx);
if (Wflag) {
char *cp = nh_types[nh->nh_type];
xo_emit("{t:type_str/%*s} ", wid_nhtype, cp);
}
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));
}
na = (struct nhop_addrs *)((char *)nh + nh->nh_len);
//inet_ntop(nh->nh_family, &nh->nh_src, src_addr, sizeof(src_addr));
//protrusion = p_addr("ifa", src_addr, wid_dst);
sa_gw = (struct sockaddr *)((char *)na + na->gw_sa_off);
sa_ifa = (struct sockaddr *)((char *)na + na->src_sa_off);
protrusion = p_sockaddr("ifa", sa_ifa, NULL, RTF_HOST, wid_dst);
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);
protrusion = print_addr("gateway", gw_addr, wid_dst - protrusion);
nhop_map_update(&global_nhop_map, nh->nh_idx, gw_addr, iface_name);
snprintf(buffer, sizeof(buffer), "{[:-%d}{:flags/%%s}{]:} ",
wid_flags - protrusion);
//p_nhflags(nh->nh_flags, buffer);
print_flags_generic(rtm->rtm_flags, rt_bits, buffer, "rt_flags_pretty");
if (Wflag) {
xo_emit("{t:use/%*lu} ", wid_pksent, nh->nh_pksent);
xo_emit("{t:mtu/%*lu} ", wid_mtu, nh->nh_mtu);
}
//printf("IDX: %d IFACE: %s FAMILY: %d TYPE: %d FLAGS: %X GW \n");
if (Wflag)
xo_emit("{t:interface-name/%*s}", wid_if, iface_name);
else
xo_emit("{t:interface-name/%*.*s}", wid_if, wid_if, iface_name);
memset(iface_name, 0, sizeof(iface_name));
if (nh->aifindex < (uint32_t)ifmap_size && nh->ifindex != nh->aifindex) {
strlcpy(iface_name, ifmap[nh->aifindex].ifname,
sizeof(iface_name));
if (*iface_name == '\0')
strlcpy(iface_name, "---", sizeof(iface_name));
}
if (Wflag)
xo_emit("{t:address-interface-name/%*s}", wid_if, iface_name);
xo_emit("{t:refcount/%*lu} ", wid_refcnt, nh->nh_refcount);
if (Wflag && nh->prepend_len) {
char *prepend_hex = "AABBCCDDEE";
xo_emit(" {:nhop-prepend/%*s}", wid_prepend, prepend_hex);
}
xo_emit("\n");
xo_close_instance(name);
}
struct nhops_map {
uint32_t idx;
struct rt_msghdr *rtm;
};
static int
cmp_nh_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);
}
static void
print_nhops_sysctl(int fibnum, int af)
{
size_t needed;
int mib[7];
char *buf, *next, *lim;
struct rt_msghdr *rtm;
struct nhop_external *nh;
int fam;
struct nhops_map *nh_map;
size_t nh_count, nh_size;
mib[0] = CTL_NET;
mib[1] = PF_ROUTE;
mib[2] = 0;
mib[3] = af;
mib[4] = NET_RT_NHOP;
mib[5] = 0;
mib[6] = fibnum;
if (sysctl(mib, nitems(mib), NULL, &needed, NULL, 0) < 0)
err(EX_OSERR, "sysctl: net.route.0.%d.nhdump.%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.nhdump.%d", af, fibnum);
lim = buf + needed;
xo_open_container("nhop-table");
xo_open_list("rt-family");
/*
* nexhops are received unsorted. Collect everything first, sort and then display
* sorted.
*/
nh_count = 0;
nh_size = 16;
nh_map = calloc(nh_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 (nh_count >= nh_size) {
nh_size *= 2;
nh_map = realloc(nh_map, nh_size * sizeof(struct nhops_map));
}
nh = (struct nhop_external *)(rtm + 1);
nh_map[nh_count].idx = nh->nh_idx;
nh_map[nh_count].rtm = rtm;
nh_count++;
}
if (nh_count > 0) {
qsort(nh_map, nh_count, sizeof(struct nhops_map), cmp_nh_idx);
nh = (struct nhop_external *)(nh_map[0].rtm + 1);
fam = nh->nh_family;
wid_dst = WID_GW_DEFAULT(fam);
wid_gw = WID_GW_DEFAULT(fam);
wid_nhidx = 5;
wid_nhtype = 12;
wid_refcnt = 6;
wid_flags = 6;
wid_pksent = 8;
wid_mtu = 6;
wid_if = WID_IF_DEFAULT(fam);
xo_open_instance("rt-family");
pr_family(fam);
xo_open_list("nh-entry");
print_nhop_header(fam);
for (size_t i = 0; i < nh_count; i++) {
rtm = nh_map[i].rtm;
nh = (struct nhop_external *)(rtm + 1);
print_nhop_entry_sysctl("nh-entry", rtm, nh);
}
xo_close_list("nh-entry");
xo_close_instance("rt-family");
}
xo_close_list("rt-family");
xo_close_container("nhop-table");
free(buf);
}
static void
p_nhflags(int f, const char *format)
{
struct bits *p;
char *pretty_name = "nh_flags_pretty";
xo_emit(format, fmt_flags(nh_bits, f));
xo_open_list(pretty_name);
for (p = nh_bits; p->b_mask; p++)
if (p->b_mask & f)
xo_emit("{le:nh_flags_pretty/%s}", p->b_name);
xo_close_list(pretty_name);
}
void
nhops_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);
xo_open_container("route-nhop-information");
xo_emit("{T:Nexthop data}");
if (fibnum)
xo_emit(" ({L:fib}: {:fib/%d})", fibnum);
xo_emit("\n");
print_nhops_sysctl(fibnum, af);
xo_close_container("route-nhop-information");
}