d/freebsd-nq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
ceb5f28ba5
freebsd-nq/usr.bin/netstat/route_netlink.c
Alexander V. Chernikov 15dbf5a241 netstat: export weight for single-path routes. 
* 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)
2023-01-29 16:27:31 +00:00

504 lines
15 KiB
C
Raw Blame History

/*-
* 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#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 <netlink/netlink.h>
#include <netlink/netlink_route.h>
#include <netlink/netlink_snl.h>
#include <netlink/netlink_snl_route.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"
#include "nl_defs.h"
static void p_rtentry_netlink(struct snl_state *ss, const char *name, struct nlmsghdr *hdr);
static struct ifmap_entry *ifmap;
static size_t ifmap_size;
struct nl_parsed_link {
uint32_t ifi_index;
uint32_t ifla_mtu;
char *ifla_ifname;
};
#define _IN(_field) offsetof(struct ifinfomsg, _field)
#define _OUT(_field) offsetof(struct nl_parsed_link, _field)
static struct snl_attr_parser ap_link[] = {
{ .type = IFLA_IFNAME, .off = _OUT(ifla_ifname), .cb = snl_attr_get_string },
{ .type = IFLA_MTU, .off = _OUT(ifla_mtu), .cb = snl_attr_get_uint32 },
};
static struct snl_field_parser fp_link[] = {
{.off_in = _IN(ifi_index), .off_out = _OUT(ifi_index), .cb = snl_field_get_uint32 },
};
#undef _IN
#undef _OUT
SNL_DECLARE_PARSER(link_parser, struct ifinfomsg, fp_link, ap_link);
/* Generate ifmap using netlink */
static struct ifmap_entry *
prepare_ifmap_netlink(struct snl_state *ss, size_t *pifmap_size)
{
struct {
struct nlmsghdr hdr;
struct ifinfomsg ifmsg;
} msg = {
.hdr.nlmsg_type = RTM_GETLINK,
.hdr.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
.hdr.nlmsg_seq = snl_get_seq(ss),
};
msg.hdr.nlmsg_len = sizeof(msg);
if (!snl_send(ss, &msg, sizeof(msg))) {
snl_free(ss);
return (NULL);
}
struct ifmap_entry *ifmap = NULL;
uint32_t ifmap_size = 0;
struct nlmsghdr *hdr;
while ((hdr = snl_read_message(ss)) != NULL && hdr->nlmsg_type != NLMSG_DONE) {
if (hdr->nlmsg_seq != msg.hdr.nlmsg_seq)
continue;
/*
if (hdr->nlmsg_type == NLMSG_ERROR)
break;
*/
struct nl_parsed_link link = {};
if (!snl_parse_nlmsg(ss, hdr, &link_parser, &link))
continue;
if (link.ifi_index >= ifmap_size) {
size_t size = roundup2(link.ifi_index + 1, 32) * sizeof(struct ifmap_entry);
if ((ifmap = realloc(ifmap, size)) == NULL)
errx(2, "realloc(%zu) failed", size);
memset(&ifmap[ifmap_size], 0,
size - ifmap_size *
sizeof(struct ifmap_entry));
ifmap_size = roundup2(link.ifi_index + 1, 32);
}
if (*ifmap[link.ifi_index].ifname != '\0')
continue;
strlcpy(ifmap[link.ifi_index].ifname, link.ifla_ifname, IFNAMSIZ);
ifmap[link.ifi_index].mtu = link.ifla_mtu;
}
*pifmap_size = ifmap_size;
return (ifmap);
}
struct rta_mpath_nh {
struct sockaddr *gw;
uint32_t ifindex;
uint8_t rtnh_flags;
uint8_t rtnh_weight;
uint32_t rtax_mtu;
uint32_t rta_rtflags;
};
#define _IN(_field) offsetof(struct rtnexthop, _field)
#define _OUT(_field) offsetof(struct rta_mpath_nh, _field)
static const struct snl_attr_parser nla_p_mp_rtmetrics[] = {
{ .type = NL_RTAX_MTU, .off = _OUT(rtax_mtu), .cb = snl_attr_get_uint32 },
};
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_RTFLAGS, .off = _OUT(gw), .cb = snl_attr_get_uint32 },
{ .type = NL_RTA_VIA, .off = _OUT(gw), .cb = snl_attr_get_ipvia },
};
static const struct snl_field_parser fpnh[] = {
{ .off_in = _IN(rtnh_flags), .off_out = _OUT(rtnh_flags), .cb = snl_field_get_uint8 },
{ .off_in = _IN(rtnh_hops), .off_out = _OUT(rtnh_weight), .cb = snl_field_get_uint8 },
{ .off_in = _IN(rtnh_ifindex), .off_out = _OUT(ifindex), .cb = snl_field_get_uint32 },
};
#undef _IN
#undef _OUT
SNL_DECLARE_PARSER(mpath_parser, struct rtnexthop, fpnh, psnh);
struct rta_mpath {
int num_nhops;
struct rta_mpath_nh nhops[0];
};
static bool
nlattr_get_multipath(struct snl_state *ss, struct nlattr *nla, const void *arg, void *target)
{
int data_len = nla->nla_len - sizeof(struct nlattr);
struct rtnexthop *rtnh;
int max_nhops = data_len / sizeof(struct rtnexthop);
size_t sz = (max_nhops + 2) * sizeof(struct rta_mpath_nh);
struct rta_mpath *mp = snl_allocz(ss, sz);
mp->num_nhops = 0;
for (rtnh = (struct rtnexthop *)(nla + 1); data_len > 0; ) {
struct rta_mpath_nh *mpnh = &mp->nhops[mp->num_nhops++];
if (!snl_parse_header(ss, rtnh, rtnh->rtnh_len, &mpath_parser, mpnh))
return (false);
int len = NL_ITEM_ALIGN(rtnh->rtnh_len);
data_len -= len;
rtnh = (struct rtnexthop *)((char *)rtnh + len);
}
if (data_len != 0 || mp->num_nhops == 0) {
return (false);
}
*((struct rta_mpath **)target) = mp;
return (true);
}
struct nl_parsed_route {
struct sockaddr *rta_dst;
struct sockaddr *rta_gw;
struct nlattr *rta_metrics;
struct rta_mpath *rta_multipath;
uint32_t rta_expires;
uint32_t rta_oif;
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;
uint8_t rtm_family;
uint8_t rtm_type;
uint8_t rtm_protocol;
uint8_t rtm_dst_len;
};
#define _IN(_field) offsetof(struct rtmsg, _field)
#define _OUT(_field) offsetof(struct nl_parsed_route, _field)
static const struct snl_attr_parser nla_p_rtmetrics[] = {
{ .type = NL_RTAX_MTU, .off = _OUT(rtax_mtu), .cb = snl_attr_get_uint32 },
};
SNL_DECLARE_ATTR_PARSER(metrics_parser, nla_p_rtmetrics);
static const struct snl_attr_parser ps[] = {
{ .type = NL_RTA_DST, .off = _OUT(rta_dst), .cb = snl_attr_get_ip },
{ .type = NL_RTA_OIF, .off = _OUT(rta_oif), .cb = snl_attr_get_uint32 },
{ .type = NL_RTA_GATEWAY, .off = _OUT(rta_gw), .cb = snl_attr_get_ip },
{ .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[] = {
{.off_in = _IN(rtm_family), .off_out = _OUT(rtm_family), .cb = snl_field_get_uint8 },
{.off_in = _IN(rtm_type), .off_out = _OUT(rtm_type), .cb = snl_field_get_uint8 },
{.off_in = _IN(rtm_protocol), .off_out = _OUT(rtm_protocol), .cb = snl_field_get_uint8 },
{.off_in = _IN(rtm_dst_len), .off_out = _OUT(rtm_dst_len), .cb = snl_field_get_uint8 },
};
#undef _IN
#undef _OUT
SNL_DECLARE_PARSER(rtm_parser, struct rtmsg, fprt, ps);
#define RTF_UP 0x1
#define RTF_GATEWAY 0x2
#define RTF_HOST 0x4
#define RTF_REJECT 0x8
#define RTF_DYNAMIC 0x10
#define RTF_STATIC 0x800
#define RTF_BLACKHOLE 0x1000
#define RTF_PROTO2 0x4000
#define RTF_PROTO1 0x8000
#define RTF_PROTO3 0x40000
#define RTF_FIXEDMTU 0x80000
#define RTF_PINNED 0x100000
static void
ip6_writemask(struct in6_addr *addr6, uint8_t mask)
{
uint32_t *cp;
for (cp = (uint32_t *)addr6; mask >= 32; mask -= 32)
*cp++ = 0xFFFFFFFF;
if (mask > 0)
*cp = htonl(mask ? ~((1 << (32 - mask)) - 1) : 0);
}
static void
gen_mask(int family, int plen, struct sockaddr *sa)
{
if (family == AF_INET6) {
struct sockaddr_in6 sin6 = {
.sin6_family = AF_INET6,
.sin6_len = sizeof(struct sockaddr_in6),
};
ip6_writemask(&sin6.sin6_addr, plen);
*((struct sockaddr_in6 *)sa) = sin6;
} else if (family == AF_INET) {
struct sockaddr_in sin = {
.sin_family = AF_INET,
.sin_len = sizeof(struct sockaddr_in),
.sin_addr.s_addr = htonl(plen ? ~((1 << (32 - plen)) - 1) : 0),
};
*((struct sockaddr_in *)sa) = sin;
}
}
struct sockaddr_dl_short {
u_char sdl_len; /* Total length of sockaddr */
u_char sdl_family; /* AF_LINK */
u_short sdl_index; /* if != 0, system given index for interface */
u_char sdl_type; /* interface type */
u_char sdl_nlen; /* interface name length, no trailing 0 reqd. */
u_char sdl_alen; /* link level address length */
u_char sdl_slen; /* link layer selector length */
char sdl_data[8]; /* unused */
};
static void
p_path(struct nl_parsed_route *rt, bool is_mpath)
{
struct sockaddr_in6 mask6;
struct sockaddr *pmask = (struct sockaddr *)&mask6;
char buffer[128];
char prettyname[128];
int protrusion;
gen_mask(rt->rtm_family, rt->rtm_dst_len, pmask);
protrusion = p_sockaddr("destination", rt->rta_dst, pmask, rt->rta_rtflags, wid.dst);
protrusion = p_sockaddr("gateway", rt->rta_gw, NULL, RTF_HOST,
wid.gw - protrusion);
snprintf(buffer, sizeof(buffer), "{[:-%d}{:flags/%%s}{]:} ",
wid.flags - protrusion);
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) {
strlcpy(prettyname, ifmap[rt->rta_oif].ifname,
sizeof(prettyname));
if (*prettyname == '\0')
strlcpy(prettyname, "---", sizeof(prettyname));
if (rt->rtax_mtu == 0)
rt->rtax_mtu = ifmap[rt->rta_oif].mtu;
}
if (Wflag) {
/* XXX: use=0? */
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);
else {
/* use interface mtu */
xo_emit("{P:/%*s} ", wid.mtu, "");
}
}
if (Wflag)
xo_emit("{t:interface-name/%*s}", wid.iface, prettyname);
else
xo_emit("{t:interface-name/%*.*s}", wid.iface, wid.iface,
prettyname);
if (rt->rta_expires > 0) {
xo_emit(" {:expire-time/%*u}", wid.expire, rt->rta_expires);
}
}
static void
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;
uint32_t orig_mtu = rt.rtax_mtu;
for (int i = 0; i < rt.rta_multipath->num_nhops; i++) {
struct rta_mpath_nh *nhop = &rt.rta_multipath->nhops[i];
rt.rta_gw = nhop->gw;
rt.rta_oif = nhop->ifindex;
rt.rtax_weight = nhop->rtnh_weight;
rt.rta_rtflags = nhop->rta_rtflags ? nhop->rta_rtflags : orig_rtflags;
rt.rtax_mtu = nhop->rtax_mtu ? nhop->rtax_mtu : orig_mtu;
xo_open_instance(name);
p_path(&rt, true);
xo_emit("\n");
xo_close_instance(name);
}
return;
}
struct sockaddr_dl_short sdl_gw = {
.sdl_family = AF_LINK,
.sdl_len = sizeof(struct sockaddr_dl_short),
.sdl_index = rt.rta_oif,
};
if (rt.rta_gw == NULL)
rt.rta_gw = (struct sockaddr *)&sdl_gw;
xo_open_instance(name);
p_path(&rt, false);
xo_emit("\n");
xo_close_instance(name);
}
static const struct snl_hdr_parser *all_parsers[] = {
&link_parser, &metrics_mp_parser, &mpath_parser, &metrics_parser, &rtm_parser
};
bool
p_rtable_netlink(int fibnum, int af)
{
int fam = AF_UNSPEC;
int need_table_close = false;
struct nlmsghdr *hdr;
struct snl_state ss = {};
SNL_VERIFY_PARSERS(all_parsers);
if (!snl_init(&ss, NETLINK_ROUTE))
return (false);
ifmap = prepare_ifmap_netlink(&ss, &ifmap_size);
struct {
struct nlmsghdr hdr;
struct rtmsg rtmsg;
struct nlattr nla_fibnum;
uint32_t fibnum;
} msg = {
.hdr.nlmsg_type = RTM_GETROUTE,
.hdr.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
.hdr.nlmsg_seq = snl_get_seq(&ss),
.rtmsg.rtm_family = af,
.nla_fibnum.nla_len = sizeof(struct nlattr) + sizeof(uint32_t),
.nla_fibnum.nla_type = RTA_TABLE,
.fibnum = fibnum,
};
msg.hdr.nlmsg_len = sizeof(msg);
if (!snl_send(&ss, &msg, sizeof(msg))) {
snl_free(&ss);
return (false);
}
xo_open_container("route-table");
xo_open_list("rt-family");
while ((hdr = snl_read_message(&ss)) != NULL && hdr->nlmsg_type != NLMSG_DONE) {
if (hdr->nlmsg_seq != msg.hdr.nlmsg_seq)
continue;
struct rtmsg *rtm = (struct rtmsg *)(hdr + 1);
/* Only print family first time. */
if (fam != rtm->rtm_family) {
if (need_table_close) {
xo_close_list("rt-entry");
xo_close_instance("rt-family");
}
need_table_close = true;
fam = rtm->rtm_family;
set_wid(fam);
xo_open_instance("rt-family");
pr_family(fam);
xo_open_list("rt-entry");
pr_rthdr(fam);
}
p_rtentry_netlink(&ss, "rt-entry", hdr);
snl_clear_lb(&ss);
}
if (need_table_close) {
xo_close_list("rt-entry");
xo_close_instance("rt-family");
}
xo_close_list("rt-family");
xo_close_container("route-table");
snl_free(&ss);
return (true);
}
Reference in New Issue View Git Blame Copy Permalink