+/*
+ * ipneigh.c "ip neigh".
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
+ *
+ *
+ * Changes:
+ *
+ * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <syslog.h>
+#include <fcntl.h>
+#include <string.h>
+#include <sys/time.h>
+#include <net/if.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netinet/ip.h>
+
+#include "rt_names.h"
+#include "utils.h"
+#include "ip_common.h"
+
+#define NUD_VALID (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE|NUD_PROBE|NUD_STALE|NUD_DELAY)
+
+static struct
+{
+ int family;
+ int index;
+ int state;
+ int unused_only;
+ inet_prefix pfx;
+ int flushed;
+ char *flushb;
+ int flushp;
+ int flushe;
+ struct rtnl_handle *rth;
+} filter;
+
+static void usage(void) __attribute__((noreturn));
+
+static void usage(void)
+{
+ fprintf(stderr, "Usage: ip neigh { add | del | change | replace } { ADDR [ lladdr LLADDR ]\n"
+ " [ nud { permanent | noarp | stale | reachable } ]\n"
+ " | proxy ADDR } [ dev DEV ]\n");
+ fprintf(stderr, " ip neigh {show|flush} [ to PREFIX ] [ dev DEV ] [ nud STATE ]\n");
+ exit(-1);
+}
+
+int nud_state_a2n(unsigned *state, char *arg)
+{
+ if (matches(arg, "permanent") == 0)
+ *state = NUD_PERMANENT;
+ else if (matches(arg, "reachable") == 0)
+ *state = NUD_REACHABLE;
+ else if (strcmp(arg, "noarp") == 0)
+ *state = NUD_NOARP;
+ else if (strcmp(arg, "none") == 0)
+ *state = NUD_NONE;
+ else if (strcmp(arg, "stale") == 0)
+ *state = NUD_STALE;
+ else if (strcmp(arg, "incomplete") == 0)
+ *state = NUD_INCOMPLETE;
+ else if (strcmp(arg, "delay") == 0)
+ *state = NUD_DELAY;
+ else if (strcmp(arg, "probe") == 0)
+ *state = NUD_PROBE;
+ else if (matches(arg, "failed") == 0)
+ *state = NUD_FAILED;
+ else {
+ if (get_unsigned(state, arg, 0))
+ return -1;
+ if (*state>=0x100 || (*state&((*state)-1)))
+ return -1;
+ }
+ return 0;
+}
+
+char * nud_state_n2a(__u8 state, char *buf, int len)
+{
+ switch (state) {
+ case NUD_NONE:
+ return "none";
+ case NUD_INCOMPLETE:
+ return "incomplete";
+ case NUD_REACHABLE:
+ return "reachable";
+ case NUD_STALE:
+ return "stale";
+ case NUD_DELAY:
+ return "delay";
+ case NUD_PROBE:
+ return "probe";
+ case NUD_FAILED:
+ return "failed";
+ case NUD_NOARP:
+ return "noarp";
+ case NUD_PERMANENT:
+ return "permanent";
+ default:
+ snprintf(buf, len, "%x", state);
+ return buf;
+ }
+}
+
+static int flush_update(void)
+{
+ if (rtnl_send(filter.rth, filter.flushb, filter.flushp) < 0) {
+ perror("Failed to send flush request\n");
+ return -1;
+ }
+ filter.flushp = 0;
+ return 0;
+}
+
+
+static int ipneigh_modify(int cmd, int flags, int argc, char **argv)
+{
+ struct rtnl_handle rth;
+ struct {
+ struct nlmsghdr n;
+ struct ndmsg ndm;
+ char buf[256];
+ } req;
+ char *d = NULL;
+ int dst_ok = 0;
+ int lladdr_ok = 0;
+ char * lla = NULL;
+ inet_prefix dst;
+
+ memset(&req, 0, sizeof(req));
+
+ req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ndmsg));
+ req.n.nlmsg_flags = NLM_F_REQUEST|flags;
+ req.n.nlmsg_type = cmd;
+ req.ndm.ndm_family = preferred_family;
+ req.ndm.ndm_state = NUD_PERMANENT;
+
+ while (argc > 0) {
+ if (matches(*argv, "lladdr") == 0) {
+ NEXT_ARG();
+ if (lladdr_ok)
+ duparg("lladdr", *argv);
+ lla = *argv;
+ lladdr_ok = 1;
+ } else if (strcmp(*argv, "nud") == 0) {
+ unsigned state;
+ NEXT_ARG();
+ if (nud_state_a2n(&state, *argv))
+ invarg("nud state is bad", *argv);
+ req.ndm.ndm_state = state;
+ } else if (matches(*argv, "proxy") == 0) {
+ NEXT_ARG();
+ if (matches(*argv, "help") == 0)
+ usage();
+ if (dst_ok)
+ duparg("address", *argv);
+ get_addr(&dst, *argv, preferred_family);
+ dst_ok = 1;
+ req.ndm.ndm_flags |= NTF_PROXY;
+ } else if (strcmp(*argv, "dev") == 0) {
+ NEXT_ARG();
+ d = *argv;
+ } else {
+ if (strcmp(*argv, "to") == 0) {
+ NEXT_ARG();
+ }
+ if (matches(*argv, "help") == 0) {
+ NEXT_ARG();
+ }
+ if (dst_ok)
+ duparg2("to", *argv);
+ get_addr(&dst, *argv, preferred_family);
+ dst_ok = 1;
+ }
+ argc--; argv++;
+ }
+ if (d == NULL || !dst_ok || dst.family == AF_UNSPEC) {
+ fprintf(stderr, "Device and destination are required arguments.\n");
+ exit(-1);
+ }
+ req.ndm.ndm_family = dst.family;
+ addattr_l(&req.n, sizeof(req), NDA_DST, &dst.data, dst.bytelen);
+
+ if (lla && strcmp(lla, "null")) {
+ __u8 llabuf[16];
+ int l;
+
+ l = ll_addr_a2n(llabuf, sizeof(llabuf), lla);
+ addattr_l(&req.n, sizeof(req), NDA_LLADDR, llabuf, l);
+ }
+
+ if (rtnl_open(&rth, 0) < 0)
+ exit(1);
+
+ ll_init_map(&rth);
+
+ if ((req.ndm.ndm_ifindex = ll_name_to_index(d)) == 0) {
+ fprintf(stderr, "Cannot find device \"%s\"\n", d);
+ return -1;
+ }
+
+ if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
+ exit(2);
+
+ exit(0);
+}
+
+
+int print_neigh(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
+{
+ FILE *fp = (FILE*)arg;
+ 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) {
+ fprintf(stderr, "Not RTM_NEWNEIGH: %08x %08x %08x\n",
+ n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
+
+ return 0;
+ }
+ len -= NLMSG_LENGTH(sizeof(*r));
+ if (len < 0) {
+ fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
+ return -1;
+ }
+
+ if (filter.flushb && n->nlmsg_type != RTM_NEWNEIGH)
+ return 0;
+
+ if (filter.family && filter.family != r->ndm_family)
+ return 0;
+ if (filter.index && filter.index != r->ndm_ifindex)
+ return 0;
+ if (!(filter.state&r->ndm_state) &&
+ (r->ndm_state || !(filter.state&0x100)) &&
+ (r->ndm_family != AF_DECnet))
+ return 0;
+
+ memset(tb, 0, sizeof(tb));
+ parse_rtattr(tb, NDA_MAX, NDA_RTA(r), n->nlmsg_len - NLMSG_LENGTH(sizeof(*r)));
+
+ if (tb[NDA_DST]) {
+ if (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, &filter.pfx, filter.pfx.bitlen))
+ return 0;
+ }
+ }
+ if (filter.unused_only && tb[NDA_CACHEINFO]) {
+ struct nda_cacheinfo *ci = RTA_DATA(tb[NDA_CACHEINFO]);
+ if (ci->ndm_refcnt)
+ return 0;
+ }
+
+ if (filter.flushb) {
+ struct nlmsghdr *fn;
+ if (NLMSG_ALIGN(filter.flushp) + n->nlmsg_len > filter.flushe) {
+ if (flush_update())
+ return -1;
+ }
+ fn = (struct nlmsghdr*)(filter.flushb + NLMSG_ALIGN(filter.flushp));
+ memcpy(fn, n, n->nlmsg_len);
+ fn->nlmsg_type = RTM_DELNEIGH;
+ fn->nlmsg_flags = NLM_F_REQUEST;
+ fn->nlmsg_seq = ++filter.rth->seq;
+ filter.flushp = (((char*)fn) + n->nlmsg_len) - filter.flushb;
+ filter.flushed++;
+ if (show_stats < 2)
+ return 0;
+ }
+
+ if (tb[NDA_DST]) {
+ fprintf(fp, "%s ",
+ format_host(r->ndm_family,
+ RTA_PAYLOAD(tb[NDA_DST]),
+ RTA_DATA(tb[NDA_DST]),
+ abuf, sizeof(abuf)));
+ }
+ if (!filter.index && r->ndm_ifindex)
+ fprintf(fp, "dev %s ", ll_index_to_name(r->ndm_ifindex));
+ if (tb[NDA_LLADDR]) {
+ SPRINT_BUF(b1);
+ fprintf(fp, "lladdr %s", ll_addr_n2a(RTA_DATA(tb[NDA_LLADDR]),
+ RTA_PAYLOAD(tb[NDA_LLADDR]),
+ ll_index_to_type(r->ndm_ifindex),
+ b1, sizeof(b1)));
+ }
+ if (r->ndm_flags & NTF_ROUTER) {
+ fprintf(fp, " router");
+ }
+ if (tb[NDA_CACHEINFO] && show_stats) {
+ static int hz;
+ struct nda_cacheinfo *ci = RTA_DATA(tb[NDA_CACHEINFO]);
+ if (!hz)
+ hz = get_hz();
+ if (ci->ndm_refcnt)
+ printf(" ref %d", ci->ndm_refcnt);
+ fprintf(fp, " used %d/%d/%d", ci->ndm_used/hz,
+ ci->ndm_confirmed/hz, ci->ndm_updated/hz);
+ }
+
+ if (r->ndm_state) {
+ SPRINT_BUF(b1);
+ fprintf(fp, " nud %s", nud_state_n2a(r->ndm_state, b1, sizeof(b1)));
+ }
+ fprintf(fp, "\n");
+
+ fflush(fp);
+ return 0;
+}
+
+void ipneigh_reset_filter()
+{
+ memset(&filter, 0, sizeof(filter));
+ filter.state = ~0;
+}
+
+int do_show_or_flush(int argc, char **argv, int flush)
+{
+ char *filter_dev = NULL;
+ struct rtnl_handle rth;
+ int state_given = 0;
+
+ ipneigh_reset_filter();
+
+ if (!filter.family)
+ filter.family = preferred_family;
+
+ if (flush) {
+ if (argc <= 0) {
+ fprintf(stderr, "Flush requires arguments.\n");
+ return -1;
+ }
+ filter.state = ~(NUD_PERMANENT|NUD_NOARP);
+ } else
+ filter.state = 0xFF & ~NUD_NOARP;
+
+ while (argc > 0) {
+ if (strcmp(*argv, "dev") == 0) {
+ NEXT_ARG();
+ if (filter_dev)
+ duparg("dev", *argv);
+ filter_dev = *argv;
+ } else if (strcmp(*argv, "unused") == 0) {
+ filter.unused_only = 1;
+ } else if (strcmp(*argv, "nud") == 0) {
+ unsigned state;
+ NEXT_ARG();
+ if (!state_given) {
+ state_given = 1;
+ filter.state = 0;
+ }
+ if (nud_state_a2n(&state, *argv)) {
+ if (strcmp(*argv, "all") != 0)
+ invarg("nud state is bad", *argv);
+ state = ~0;
+ if (flush)
+ state &= ~NUD_NOARP;
+ }
+ if (state == 0)
+ state = 0x100;
+ filter.state |= state;
+ } else {
+ if (strcmp(*argv, "to") == 0) {
+ NEXT_ARG();
+ }
+ if (matches(*argv, "help") == 0)
+ usage();
+ get_prefix(&filter.pfx, *argv, filter.family);
+ if (filter.family == AF_UNSPEC)
+ filter.family = filter.pfx.family;
+ }
+ argc--; argv++;
+ }
+
+ if (rtnl_open(&rth, 0) < 0)
+ exit(1);
+
+ ll_init_map(&rth);
+
+ if (filter_dev) {
+ if ((filter.index = ll_name_to_index(filter_dev)) == 0) {
+ fprintf(stderr, "Cannot find device \"%s\"\n", filter_dev);
+ return -1;
+ }
+ }
+
+ if (flush) {
+ int round = 0;
+ char flushb[4096-512];
+
+ filter.flushb = flushb;
+ filter.flushp = 0;
+ filter.flushe = sizeof(flushb);
+ filter.rth = &rth;
+ filter.state &= ~NUD_FAILED;
+
+ for (;;) {
+ if (rtnl_wilddump_request(&rth, filter.family, RTM_GETNEIGH) < 0) {
+ perror("Cannot send dump request");
+ exit(1);
+ }
+ filter.flushed = 0;
+ if (rtnl_dump_filter(&rth, print_neigh, stdout, NULL, NULL) < 0) {
+ fprintf(stderr, "Flush terminated\n");
+ exit(1);
+ }
+ if (filter.flushed == 0) {
+ if (round == 0) {
+ fprintf(stderr, "Nothing to flush.\n");
+ } else if (show_stats)
+ printf("*** Flush is complete after %d round%s ***\n", round, round>1?"s":"");
+ fflush(stdout);
+ return 0;
+ }
+ round++;
+ if (flush_update() < 0)
+ exit(1);
+ if (show_stats) {
+ printf("\n*** Round %d, deleting %d entries ***\n", round, filter.flushed);
+ fflush(stdout);
+ }
+ }
+ }
+
+ if (rtnl_wilddump_request(&rth, filter.family, RTM_GETNEIGH) < 0) {
+ perror("Cannot send dump request");
+ exit(1);
+ }
+
+ if (rtnl_dump_filter(&rth, print_neigh, stdout, NULL, NULL) < 0) {
+ fprintf(stderr, "Dump terminated\n");
+ exit(1);
+ }
+
+ return 0;
+}
+
+int do_ipneigh(int argc, char **argv)
+{
+ if (argc > 0) {
+ if (matches(*argv, "add") == 0)
+ return ipneigh_modify(RTM_NEWNEIGH, NLM_F_CREATE|NLM_F_EXCL, argc-1, argv+1);
+ if (matches(*argv, "change") == 0 ||
+ strcmp(*argv, "chg") == 0)
+ return ipneigh_modify(RTM_NEWNEIGH, NLM_F_REPLACE, argc-1, argv+1);
+ if (matches(*argv, "replace") == 0)
+ return ipneigh_modify(RTM_NEWNEIGH, NLM_F_CREATE|NLM_F_REPLACE, argc-1, argv+1);
+ if (matches(*argv, "delete") == 0)
+ return ipneigh_modify(RTM_DELNEIGH, 0, argc-1, argv+1);
+ if (matches(*argv, "get") == 0) {
+ fprintf(stderr, "Sorry, \"neigh get\" is not implemented :-(\n");
+ return -1;
+ }
+ if (matches(*argv, "show") == 0 ||
+ matches(*argv, "lst") == 0 ||
+ matches(*argv, "list") == 0)
+ return do_show_or_flush(argc-1, argv+1, 0);
+ if (matches(*argv, "flush") == 0)
+ return do_show_or_flush(argc-1, argv+1, 1);
+ if (matches(*argv, "help") == 0)
+ usage();
+ } else
+ return do_show_or_flush(0, NULL, 0);
+
+ fprintf(stderr, "Command \"%s\" is unknown, try \"ip neigh help\".\n", *argv);
+ exit(-1);
+}
projects / mirror_iproute2.git / blobdiff