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networking: add 'ip neigh' command

Browse Source 
This patch ports the 'ip neigh' command, originally written by Alexey
Kuznetsov, <kuznet@ms2.inr.ac.ru>, to busybox.

The base of the port is the version of iproute that shipped with
Debian Squeeze, taken from:

  http://http.debian.net/debian/pool/main/i/iproute/iproute_20100519.orig.tar.gz

This patch has actively been used by the Open Network Install
Environment (ONIE) project for over 3 years without incident.

function                                             old     new   delta
print_neigh                                            -     933    +933
ipneigh_list_or_flush                                  -     742    +742
get_hz                                                 -     109    +109
do_ipneigh                                             -      62     +62
do_iproute                                          2112    2153     +41
packed_usage                                       30647   30667     +20
ipneigh_main                                           -      14     +14
static.ip_neigh_commands                               -      12     +12
static.nuds                                            -       9      +9
static.ip_func_ptrs                                   32      36      +4
print_route                                         1858    1727    -131
------------------------------------------------------------------------------
(add/remove: 8/0 grow/shrink: 3/1 up/down: 1946/-131)        Total: 1815 bytes

Signed-off-by: Curt Brune <curt@cumulusnetworks.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Curt Brune 2015-10-14 12:53:47 +02:00 committed by Denys Vlasenko
parent 7b85ec30b5
commit 69934701fd
8 changed files with 420 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
networking/Config.src
View File

@ -554,6 +554,13 @@ config FEATURE_IP_RULE
help
Add support for rule commands to "ip".
config FEATURE_IP_NEIGH
bool "ip neighbor"
default y
depends on IP
help
Add support for neighbor commands to "ip".
config FEATURE_IP_SHORT_FORMS
bool "Support short forms of ip commands"
default y
@ -565,6 +572,7 @@ config FEATURE_IP_SHORT_FORMS
ip route -> iproute
ip tunnel -> iptunnel
ip rule -> iprule
ip neigh -> ipneigh
Say N unless you desparately need the short form of the ip
object commands.
@ -604,6 +612,11 @@ config IPRULE
default y
depends on FEATURE_IP_SHORT_FORMS && FEATURE_IP_RULE
config IPNEIGH
bool
default y
depends on FEATURE_IP_SHORT_FORMS && FEATURE_IP_NEIGH
config IPCALC
bool "ipcalc"
default y

19
networking/ip.c
View File

@ -16,6 +16,7 @@
//usage: IF_FEATURE_IP_ROUTE("route | ")
//usage: IF_FEATURE_IP_LINK("link | ")
//usage: IF_FEATURE_IP_TUNNEL("tunnel | ")
//usage: IF_FEATURE_IP_NEIGH("neigh | ")
//usage: IF_FEATURE_IP_RULE("rule")
//usage: "} {COMMAND}"
//usage:#define ip_full_usage "\n\n"
@ -25,6 +26,7 @@
//usage: IF_FEATURE_IP_ROUTE("route | ")
//usage: IF_FEATURE_IP_LINK("link | ")
//usage: IF_FEATURE_IP_TUNNEL("tunnel | ")
//usage: IF_FEATURE_IP_NEIGH("neigh | ")
//usage: IF_FEATURE_IP_RULE("rule")
//usage: "}\n"
//usage: "OPTIONS := { -f[amily] { inet | inet6 | link } | -o[neline] }"
@ -80,6 +82,11 @@
//usage: " [mode { ipip | gre | sit }] [remote ADDR] [local ADDR]\n"
//usage: " [[i|o]seq] [[i|o]key KEY] [[i|o]csum]\n"
//usage: " [ttl TTL] [tos TOS] [[no]pmtudisc] [dev PHYS_DEV]"
//usage:
//usage:#define ipneigh_trivial_usage
//usage: "{ show | flush} [ to PREFIX ] [ dev DEV ] [ nud STATE ]"
//usage:#define ipneigh_full_usage "\n\n"
//usage: "ipneigh { show | flush} [ to PREFIX ] [ dev DEV ] [ nud STATE ]"
#include "libbb.h"
@ -90,7 +97,8 @@
|| ENABLE_FEATURE_IP_ROUTE \
|| ENABLE_FEATURE_IP_LINK \
|| ENABLE_FEATURE_IP_TUNNEL \
|| ENABLE_FEATURE_IP_RULE
|| ENABLE_FEATURE_IP_RULE \
|| ENABLE_FEATURE_IP_NEIGH
static int FAST_FUNC ip_print_help(char **argv UNUSED_PARAM)
{
@ -140,6 +148,13 @@ int iptunnel_main(int argc UNUSED_PARAM, char **argv)
return ip_do(do_iptunnel, argv);
}
#endif
#if ENABLE_FEATURE_IP_NEIGH
int ipneigh_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int ipneigh_main(int argc UNUSED_PARAM, char **argv)
{
return ip_do(do_ipneigh, argv);
}
#endif
int ip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
@ -153,6 +168,7 @@ int ip_main(int argc UNUSED_PARAM, char **argv)
IF_FEATURE_IP_TUNNEL("tunnel\0")
IF_FEATURE_IP_TUNNEL("tunl\0")
IF_FEATURE_IP_RULE("rule\0")
IF_FEATURE_IP_NEIGH("neigh\0")
;
static const ip_func_ptr_t ip_func_ptrs[] = {
ip_print_help,
@ -163,6 +179,7 @@ int ip_main(int argc UNUSED_PARAM, char **argv)
IF_FEATURE_IP_TUNNEL(do_iptunnel,)
IF_FEATURE_IP_TUNNEL(do_iptunnel,)
IF_FEATURE_IP_RULE(do_iprule,)
IF_FEATURE_IP_NEIGH(do_ipneigh,)
};
ip_func_ptr_t ip_func;
int key;

8
networking/libiproute/Kbuild.src
View File

@ -64,3 +64,11 @@ lib-$(CONFIG_FEATURE_IP_RULE) += \
iprule.o \
rt_names.o \
utils.o
lib-$(CONFIG_FEATURE_IP_NEIGH) += \
ip_parse_common_args.o \
ipneigh.o \
libnetlink.o \
ll_map.o \
rt_names.o \
utils.o

2
networking/libiproute/ip_common.h
View File

@ -24,7 +24,7 @@ int FAST_FUNC ipaddr_list_or_flush(char **argv, int flush);
int FAST_FUNC do_ipaddr(char **argv);
int FAST_FUNC do_iproute(char **argv);
int FAST_FUNC do_iprule(char **argv);
//int FAST_FUNC do_ipneigh(char **argv);
int FAST_FUNC do_ipneigh(char **argv);
int FAST_FUNC do_iptunnel(char **argv);
int FAST_FUNC do_iplink(char **argv);
//int FAST_FUNC do_ipmonitor(char **argv);

354
networking/libiproute/ipneigh.c Normal file
View File

@ -0,0 +1,354 @@
/* vi: set sw=4 ts=4: */
/*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*
* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
*
* Ported to Busybox by: Curt Brune <curt@cumulusnetworks.com>
*/
#include "ip_common.h" /* #include "libbb.h" is inside */
#include "rt_names.h"
#include "utils.h"
#include <linux/neighbour.h>
#include <net/if_arp.h>
//static int xshow_stats = 3;
enum { xshow_stats = 3 };
static inline uint32_t rta_getattr_u32(const struct rtattr *rta)
{
return *(uint32_t *)RTA_DATA(rta);
}
#ifndef RTAX_RTTVAR
#define RTAX_RTTVAR RTAX_HOPS
#endif
struct filter_t {
int family;
int index;
int state;
int unused_only;
inet_prefix pfx;
int flushed;
char *flushb;
int flushp;
int flushe;
struct rtnl_handle *rth;
} FIX_ALIASING;
typedef struct filter_t filter_t;
#define G_filter (*(filter_t*)&bb_common_bufsiz1)
static int flush_update(void)
{
if (rtnl_send(G_filter.rth, G_filter.flushb, G_filter.flushp) < 0) {
bb_perror_msg("can't send flush request");
return -1;
}
G_filter.flushp = 0;
return 0;
}
static unsigned nud_state_a2n(char *arg)
{
static const char keywords[] ALIGN1 =
/* "ip neigh show/flush" parameters: */
"permanent\0" "reachable\0" "noarp\0" "none\0"
"stale\0" "incomplete\0" "delay\0" "probe\0"
"failed\0"
;
static uint8_t nuds[] = {
NUD_PERMANENT,NUD_REACHABLE, NUD_NOARP,NUD_NONE,
NUD_STALE, NUD_INCOMPLETE,NUD_DELAY,NUD_PROBE,
NUD_FAILED
};
int id;
BUILD_BUG_ON(
(NUD_PERMANENT|NUD_REACHABLE| NUD_NOARP|NUD_NONE|
NUD_STALE| NUD_INCOMPLETE|NUD_DELAY|NUD_PROBE|
NUD_FAILED) > 0xff
);
id = index_in_substrings(keywords, arg);
if (id < 0)
bb_error_msg_and_die(bb_msg_invalid_arg, arg, "nud state");
return nuds[id];
}
#ifndef NDA_RTA
#define NDA_RTA(r) \
((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ndmsg))))
#endif
static int FAST_FUNC print_neigh(const struct sockaddr_nl *who UNUSED_PARAM,
struct nlmsghdr *n, void *arg UNUSED_PARAM)
{
struct ndmsg *r = NLMSG_DATA(n);
int len = n->nlmsg_len;
struct rtattr *tb[NDA_MAX+1];
char abuf[256];
if (n->nlmsg_type != RTM_NEWNEIGH && n->nlmsg_type != RTM_DELNEIGH) {
bb_error_msg_and_die("not RTM_NEWNEIGH: %08x %08x %08x",
n->nlmsg_len, n->nlmsg_type,
n->nlmsg_flags);
}
len -= NLMSG_LENGTH(sizeof(*r));
if (len < 0) {
bb_error_msg_and_die("BUG: wrong nlmsg len %d", len);
}
if (G_filter.flushb && n->nlmsg_type != RTM_NEWNEIGH)
return 0;
if (G_filter.family && G_filter.family != r->ndm_family)
return 0;
if (G_filter.index && G_filter.index != r->ndm_ifindex)
return 0;
if (!(G_filter.state&r->ndm_state) &&
!(r->ndm_flags & NTF_PROXY) &&
(r->ndm_state || !(G_filter.state & 0x100)) &&
(r->ndm_family != AF_DECnet))
return 0;
parse_rtattr(tb, NDA_MAX, NDA_RTA(r), n->nlmsg_len - NLMSG_LENGTH(sizeof(*r)));
if (tb[NDA_DST]) {
if (G_filter.pfx.family) {
inet_prefix dst;
memset(&dst, 0, sizeof(dst));
dst.family = r->ndm_family;
memcpy(&dst.data, RTA_DATA(tb[NDA_DST]), RTA_PAYLOAD(tb[NDA_DST]));
if (inet_addr_match(&dst, &G_filter.pfx, G_filter.pfx.bitlen))
return 0;
}
}
if (G_filter.unused_only && tb[NDA_CACHEINFO]) {
struct nda_cacheinfo *ci = RTA_DATA(tb[NDA_CACHEINFO]);
if (ci->ndm_refcnt)
return 0;
}
if (G_filter.flushb) {
struct nlmsghdr *fn;
if (NLMSG_ALIGN(G_filter.flushp) + n->nlmsg_len > G_filter.flushe) {
if (flush_update())
return -1;
}
fn = (struct nlmsghdr*)(G_filter.flushb + NLMSG_ALIGN(G_filter.flushp));
memcpy(fn, n, n->nlmsg_len);
fn->nlmsg_type = RTM_DELNEIGH;
fn->nlmsg_flags = NLM_F_REQUEST;
fn->nlmsg_seq = ++(G_filter.rth->seq);
G_filter.flushp = (((char*)fn) + n->nlmsg_len) - G_filter.flushb;
G_filter.flushed++;
if (xshow_stats < 2)
return 0;
}
if (tb[NDA_DST]) {
printf("%s ",
format_host(r->ndm_family,
RTA_PAYLOAD(tb[NDA_DST]),
RTA_DATA(tb[NDA_DST]),
abuf, sizeof(abuf)));
}
if (!G_filter.index && r->ndm_ifindex)
printf("dev %s ", ll_index_to_name(r->ndm_ifindex));
if (tb[NDA_LLADDR]) {
SPRINT_BUF(b1);
printf("lladdr %s", ll_addr_n2a(RTA_DATA(tb[NDA_LLADDR]),
RTA_PAYLOAD(tb[NDA_LLADDR]),
ARPHRD_ETHER,
b1, sizeof(b1)));
}
if (r->ndm_flags & NTF_ROUTER) {
printf(" router");
}
if (r->ndm_flags & NTF_PROXY) {
printf(" proxy");
}
if (tb[NDA_CACHEINFO] && xshow_stats) {
struct nda_cacheinfo *ci = RTA_DATA(tb[NDA_CACHEINFO]);
int hz = get_hz();
if (ci->ndm_refcnt)
printf(" ref %d", ci->ndm_refcnt);
printf(" used %d/%d/%d", ci->ndm_used/hz,
ci->ndm_confirmed/hz, ci->ndm_updated/hz);
}
if (tb[NDA_PROBES] && xshow_stats) {
uint32_t p = rta_getattr_u32(tb[NDA_PROBES]);
printf(" probes %u", p);
}
/*if (r->ndm_state)*/ {
int nud = r->ndm_state;
char c = ' ';
#define PRINT_FLAG(f) \
if (nud & NUD_##f) { \
printf("%c"#f, c); \
c = ','; \
}
PRINT_FLAG(INCOMPLETE);
PRINT_FLAG(REACHABLE);
PRINT_FLAG(STALE);
PRINT_FLAG(DELAY);
PRINT_FLAG(PROBE);
PRINT_FLAG(FAILED);
PRINT_FLAG(NOARP);
PRINT_FLAG(PERMANENT);
#undef PRINT_FLAG
}
bb_putchar('\n');
return 0;
}
static void ipneigh_reset_filter(void)
{
memset(&G_filter, 0, sizeof(G_filter));
G_filter.state = ~0;
}
#define MAX_ROUNDS 10
/* Return value becomes exitcode. It's okay to not return at all */
static int FAST_FUNC ipneigh_list_or_flush(char **argv, int flush)
{
static const char keywords[] ALIGN1 =
/* "ip neigh show/flush" parameters: */
"to\0" "dev\0" "nud\0";
enum {
KW_to, KW_dev, KW_nud,
};
struct rtnl_handle rth;
struct ndmsg ndm = { 0 };
char *filter_dev = NULL;
int state_given = 0;
int arg;
ipneigh_reset_filter();
if (flush && !*argv)
bb_error_msg_and_die(bb_msg_requires_arg, "\"ip neigh flush\"");
if (!G_filter.family)
G_filter.family = preferred_family;
G_filter.state = (flush) ?
~(NUD_PERMANENT|NUD_NOARP) : 0xFF & ~NUD_NOARP;
while (*argv) {
arg = index_in_substrings(keywords, *argv);
if (arg == KW_dev) {
NEXT_ARG();
filter_dev = *argv;
} else if (arg == KW_nud) {
unsigned state;
NEXT_ARG();
if (!state_given) {
state_given = 1;
G_filter.state = 0;
}
if (strcmp(*argv, "all") == 0) {
state = ~0;
if (flush)
state &= ~NUD_NOARP;
} else {
state = nud_state_a2n(*argv);
}
if (state == 0)
state = 0x100;
G_filter.state |= state;
} else {
if (arg == KW_to) {
NEXT_ARG();
}
get_prefix(&G_filter.pfx, *argv, G_filter.family);
if (G_filter.family == AF_UNSPEC)
G_filter.family = G_filter.pfx.family;
}
argv++;
}
xrtnl_open(&rth);
ll_init_map(&rth);
if (filter_dev) {
if ((G_filter.index = xll_name_to_index(filter_dev)) == 0) {
bb_error_msg_and_die(bb_msg_invalid_arg,
filter_dev, "Cannot find device");
}
}
if (flush) {
int round = 0;
char flushb[4096-512];
G_filter.flushb = flushb;
G_filter.flushp = 0;
G_filter.flushe = sizeof(flushb);
G_filter.state &= ~NUD_FAILED;
G_filter.rth = &rth;
while (round < MAX_ROUNDS) {
if (xrtnl_wilddump_request(&rth, G_filter.family, RTM_GETNEIGH) < 0) {
bb_perror_msg_and_die("can't send dump request");
}
G_filter.flushed = 0;
if (xrtnl_dump_filter(&rth, print_neigh, NULL) < 0) {
bb_perror_msg_and_die("flush terminated");
}
if (G_filter.flushed == 0) {
if (round == 0)
puts("Nothing to flush");
else
printf("*** Flush is complete after %d round(s) ***\n", round);
return 0;
}
round++;
if (flush_update() < 0)
xfunc_die();
printf("\n*** Round %d, deleting %d entries ***\n", round, G_filter.flushed);
}
bb_error_msg_and_die("*** Flush not complete bailing out after %d rounds", MAX_ROUNDS);
}
ndm.ndm_family = G_filter.family;
if (rtnl_dump_request(&rth, RTM_GETNEIGH, &ndm, sizeof(struct ndmsg)) < 0) {
bb_perror_msg_and_die("can't send dump request");
}
if (xrtnl_dump_filter(&rth, print_neigh, NULL) < 0) {
bb_error_msg_and_die("dump terminated");
}
return 0;
}
/* Return value becomes exitcode. It's okay to not return at all */
int FAST_FUNC do_ipneigh(char **argv)
{
static const char ip_neigh_commands[] ALIGN1 =
/*0-1*/ "show\0" "flush\0";
int command_num;
if (!*argv)
return ipneigh_list_or_flush(argv, 0);
command_num = index_in_substrings(ip_neigh_commands, *argv);
switch (command_num) {
case 0: /* show */
return ipneigh_list_or_flush(argv + 1, 0);
case 1: /* flush */
return ipneigh_list_or_flush(argv + 1, 1);
}
invarg(*argv, applet_name);
return 1;
}

26
networking/libiproute/iproute.c
View File

@ -55,28 +55,6 @@ static int flush_update(void)
return 0;
}
static unsigned get_hz(void)
{
static unsigned hz_internal;
FILE *fp;
if (hz_internal)
return hz_internal;
fp = fopen_for_read("/proc/net/psched");
if (fp) {
unsigned nom, denom;
if (fscanf(fp, "%*08x%*08x%08x%08x", &nom, &denom) == 2)
if (nom == 1000000)
hz_internal = denom;
fclose(fp);
}
if (!hz_internal)
hz_internal = bb_clk_tck();
return hz_internal;
}
static int FAST_FUNC print_route(const struct sockaddr_nl *who UNUSED_PARAM,
struct nlmsghdr *n, void *arg UNUSED_PARAM)
{
@ -217,7 +195,7 @@ static int FAST_FUNC print_route(const struct sockaddr_nl *who UNUSED_PARAM,
if (NLMSG_ALIGN(G_filter.flushp) + n->nlmsg_len > G_filter.flushe) {
if (flush_update())
bb_error_msg_and_die("flush");
xfunc_die();
}
fn = (void*)(G_filter.flushb + NLMSG_ALIGN(G_filter.flushp));
memcpy(fn, n, n->nlmsg_len);
@ -954,7 +932,7 @@ int FAST_FUNC do_iproute(char **argv)
case 11: /* flush */
return iproute_list_or_flush(argv+1, 1);
default:
bb_error_msg_and_die("unknown command %s", *argv);
invarg(*argv, applet_name);
}
return iproute_modify(cmd, flags, argv+1);

22
networking/libiproute/utils.c
View File

@ -13,6 +13,28 @@
#include "utils.h"
#include "inet_common.h"
unsigned get_hz(void)
{
static unsigned hz_internal;
FILE *fp;
if (hz_internal)
return hz_internal;
fp = fopen_for_read("/proc/net/psched");
if (fp) {
unsigned nom, denom;
if (fscanf(fp, "%*08x%*08x%08x%08x", &nom, &denom) == 2)
if (nom == 1000000)
hz_internal = denom;
fclose(fp);
}
if (!hz_internal)
hz_internal = bb_clk_tck();
return hz_internal;
}
unsigned get_unsigned(char *arg, const char *errmsg)
{
unsigned long res;

2
networking/libiproute/utils.h
View File

@ -85,6 +85,8 @@ int dnet_pton(int af, const char *src, void *addr);
const char *ipx_ntop(int af, const void *addr, char *str, size_t len);
int ipx_pton(int af, const char *src, void *addr);
unsigned get_hz(void);
POP_SAVED_FUNCTION_VISIBILITY
#endif