| /* |
| * 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> |
| * |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <syslog.h> |
| #include <fcntl.h> |
| #include <string.h> |
| #include <sys/time.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) |
| #define MAX_ROUNDS 10 |
| |
| static struct |
| { |
| int family; |
| int index; |
| int state; |
| int unused_only; |
| inet_prefix pfx; |
| int flushed; |
| char *flushb; |
| int flushp; |
| int flushe; |
| } 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); |
| } |
| |
| static int nud_state_a2n(unsigned *state, const 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; |
| } |
| |
| static int flush_update(void) |
| { |
| if (rtnl_send_check(&rth, filter.flushb, filter.flushp) < 0) { |
| perror("Failed to send flush request"); |
| return -1; |
| } |
| filter.flushp = 0; |
| return 0; |
| } |
| |
| |
| static int ipneigh_modify(int cmd, int flags, int argc, char **argv) |
| { |
| 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")) { |
| char llabuf[20]; |
| int l; |
| |
| l = ll_addr_a2n(llabuf, sizeof(llabuf), lla); |
| addattr_l(&req.n, sizeof(req), NDA_LLADDR, llabuf, l); |
| } |
| |
| 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) < 0) |
| exit(2); |
| |
| return 0; |
| } |
| |
| |
| int print_neigh(const 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 && |
| n->nlmsg_type != RTM_GETNEIGH) { |
| 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_flags & NTF_PROXY) && |
| (r->ndm_state || !(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 (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 = ++rth.seq; |
| filter.flushp = (((char*)fn) + n->nlmsg_len) - filter.flushb; |
| filter.flushed++; |
| if (show_stats < 2) |
| return 0; |
| } |
| |
| if (n->nlmsg_type == RTM_DELNEIGH) |
| fprintf(fp, "delete "); |
| else if (n->nlmsg_type == RTM_GETNEIGH) |
| fprintf(fp, "miss "); |
| 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 (r->ndm_flags & NTF_PROXY) { |
| fprintf(fp, " proxy"); |
| } |
| if (tb[NDA_CACHEINFO] && show_stats) { |
| struct nda_cacheinfo *ci = RTA_DATA(tb[NDA_CACHEINFO]); |
| int hz = get_user_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 (tb[NDA_PROBES] && show_stats) { |
| __u32 p = rta_getattr_u32(tb[NDA_PROBES]); |
| fprintf(fp, " probes %u", p); |
| } |
| |
| if (r->ndm_state) { |
| int nud = r->ndm_state; |
| fprintf(fp, " "); |
| |
| #define PRINT_FLAG(f) if (nud & NUD_##f) { \ |
| nud &= ~NUD_##f; fprintf(fp, #f "%s", nud ? "," : ""); } |
| 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 |
| } |
| fprintf(fp, "\n"); |
| |
| fflush(fp); |
| return 0; |
| } |
| |
| void ipneigh_reset_filter(void) |
| { |
| memset(&filter, 0, sizeof(filter)); |
| filter.state = ~0; |
| } |
| |
| static int do_show_or_flush(int argc, char **argv, int flush) |
| { |
| char *filter_dev = NULL; |
| int state_given = 0; |
| struct ndmsg ndm = { 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, "proxy") == 0) |
| ndm.ndm_flags = NTF_PROXY; |
| 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++; |
| } |
| |
| 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.state &= ~NUD_FAILED; |
| |
| while (round < MAX_ROUNDS) { |
| 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) < 0) { |
| fprintf(stderr, "Flush terminated\n"); |
| exit(1); |
| } |
| if (filter.flushed == 0) { |
| if (show_stats) { |
| if (round == 0) |
| printf("Nothing to flush.\n"); |
| else |
| 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); |
| } |
| } |
| printf("*** Flush not complete bailing out after %d rounds\n", |
| MAX_ROUNDS); |
| return 1; |
| } |
| |
| ndm.ndm_family = filter.family; |
| |
| if (rtnl_dump_request(&rth, RTM_GETNEIGH, &ndm, sizeof(struct ndmsg)) < 0) { |
| perror("Cannot send dump request"); |
| exit(1); |
| } |
| |
| if (rtnl_dump_filter(&rth, print_neigh, stdout) < 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); |
| } |