/* * ipaddress.c "ip address". * * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. * * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> * * Changes: * Laszlo Valko <valko@linux.karinthy.hu> 990223: address label must be zero terminated */ #include <sys/socket.h> #include <sys/ioctl.h> #include <fnmatch.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <arpa/inet.h> #include <net/if.h> #include <net/if_arp.h> #include "rt_names.h" #include "utils.h" #include "ip_common.h" #include "libbb.h" static struct { int ifindex; int family; int oneline; int showqueue; inet_prefix pfx; int scope, scopemask; int flags, flagmask; int up; char *label; int flushed; char *flushb; int flushp; int flushe; struct rtnl_handle *rth; } filter; static void print_link_flags(FILE *fp, unsigned flags, unsigned mdown) { fprintf(fp, "<"); flags &= ~IFF_RUNNING; #define _PF(f) if (flags&IFF_##f) { \ flags &= ~IFF_##f ; \ fprintf(fp, #f "%s", flags ? "," : ""); } _PF(LOOPBACK); _PF(BROADCAST); _PF(POINTOPOINT); _PF(MULTICAST); _PF(NOARP); #if 0 _PF(ALLMULTI); _PF(PROMISC); _PF(MASTER); _PF(SLAVE); _PF(DEBUG); _PF(DYNAMIC); _PF(AUTOMEDIA); _PF(PORTSEL); _PF(NOTRAILERS); #endif _PF(UP); #undef _PF if (flags) fprintf(fp, "%x", flags); if (mdown) fprintf(fp, ",M-DOWN"); fprintf(fp, "> "); } static void print_queuelen(char *name) { struct ifreq ifr; int s; s = socket(AF_INET, SOCK_STREAM, 0); if (s < 0) return; memset(&ifr, 0, sizeof(ifr)); strcpy(ifr.ifr_name, name); if (ioctl(s, SIOCGIFTXQLEN, &ifr) < 0) { perror("SIOCGIFXQLEN"); close(s); return; } close(s); if (ifr.ifr_qlen) printf("qlen %d", ifr.ifr_qlen); } static int print_linkinfo(struct sockaddr_nl ATTRIBUTE_UNUSED *who, struct nlmsghdr *n, void ATTRIBUTE_UNUSED *arg) { FILE *fp = (FILE*)arg; struct ifinfomsg *ifi = NLMSG_DATA(n); struct rtattr * tb[IFLA_MAX+1]; int len = n->nlmsg_len; unsigned m_flag = 0; if (n->nlmsg_type != RTM_NEWLINK && n->nlmsg_type != RTM_DELLINK) return 0; len -= NLMSG_LENGTH(sizeof(*ifi)); if (len < 0) return -1; if (filter.ifindex && ifi->ifi_index != filter.ifindex) return 0; if (filter.up && !(ifi->ifi_flags&IFF_UP)) return 0; memset(tb, 0, sizeof(tb)); parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), len); if (tb[IFLA_IFNAME] == NULL) { bb_error_msg("nil ifname"); return -1; } if (filter.label && (!filter.family || filter.family == AF_PACKET) && fnmatch(filter.label, RTA_DATA(tb[IFLA_IFNAME]), 0)) return 0; if (n->nlmsg_type == RTM_DELLINK) fprintf(fp, "Deleted "); fprintf(fp, "%d: %s", ifi->ifi_index, tb[IFLA_IFNAME] ? (char*)RTA_DATA(tb[IFLA_IFNAME]) : "<nil>"); if (tb[IFLA_LINK]) { SPRINT_BUF(b1); int iflink = *(int*)RTA_DATA(tb[IFLA_LINK]); if (iflink == 0) fprintf(fp, "@NONE: "); else { fprintf(fp, "@%s: ", ll_idx_n2a(iflink, b1)); m_flag = ll_index_to_flags(iflink); m_flag = !(m_flag & IFF_UP); } } else { fprintf(fp, ": "); } print_link_flags(fp, ifi->ifi_flags, m_flag); if (tb[IFLA_MTU]) fprintf(fp, "mtu %u ", *(int*)RTA_DATA(tb[IFLA_MTU])); if (tb[IFLA_QDISC]) fprintf(fp, "qdisc %s ", (char*)RTA_DATA(tb[IFLA_QDISC])); #ifdef IFLA_MASTER if (tb[IFLA_MASTER]) { SPRINT_BUF(b1); fprintf(fp, "master %s ", ll_idx_n2a(*(int*)RTA_DATA(tb[IFLA_MASTER]), b1)); } #endif if (filter.showqueue) print_queuelen((char*)RTA_DATA(tb[IFLA_IFNAME])); if (!filter.family || filter.family == AF_PACKET) { SPRINT_BUF(b1); fprintf(fp, "%s", _SL_); fprintf(fp, " link/%s ", ll_type_n2a(ifi->ifi_type, b1, sizeof(b1))); if (tb[IFLA_ADDRESS]) { fprintf(fp, "%s", ll_addr_n2a(RTA_DATA(tb[IFLA_ADDRESS]), RTA_PAYLOAD(tb[IFLA_ADDRESS]), ifi->ifi_type, b1, sizeof(b1))); } if (tb[IFLA_BROADCAST]) { if (ifi->ifi_flags&IFF_POINTOPOINT) fprintf(fp, " peer "); else fprintf(fp, " brd "); fprintf(fp, "%s", ll_addr_n2a(RTA_DATA(tb[IFLA_BROADCAST]), RTA_PAYLOAD(tb[IFLA_BROADCAST]), ifi->ifi_type, b1, sizeof(b1))); } } fprintf(fp, "\n"); fflush(fp); return 0; } 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 print_addrinfo(struct sockaddr_nl ATTRIBUTE_UNUSED *who, struct nlmsghdr *n, void ATTRIBUTE_UNUSED *arg) { FILE *fp = (FILE*)arg; struct ifaddrmsg *ifa = NLMSG_DATA(n); int len = n->nlmsg_len; struct rtattr * rta_tb[IFA_MAX+1]; char abuf[256]; SPRINT_BUF(b1); if (n->nlmsg_type != RTM_NEWADDR && n->nlmsg_type != RTM_DELADDR) return 0; len -= NLMSG_LENGTH(sizeof(*ifa)); if (len < 0) { bb_error_msg("wrong nlmsg len %d", len); return -1; } if (filter.flushb && n->nlmsg_type != RTM_NEWADDR) return 0; memset(rta_tb, 0, sizeof(rta_tb)); parse_rtattr(rta_tb, IFA_MAX, IFA_RTA(ifa), n->nlmsg_len - NLMSG_LENGTH(sizeof(*ifa))); if (!rta_tb[IFA_LOCAL]) rta_tb[IFA_LOCAL] = rta_tb[IFA_ADDRESS]; if (!rta_tb[IFA_ADDRESS]) rta_tb[IFA_ADDRESS] = rta_tb[IFA_LOCAL]; if (filter.ifindex && filter.ifindex != ifa->ifa_index) return 0; if ((filter.scope^ifa->ifa_scope)&filter.scopemask) return 0; if ((filter.flags^ifa->ifa_flags)&filter.flagmask) return 0; if (filter.label) { const char *label; if (rta_tb[IFA_LABEL]) label = RTA_DATA(rta_tb[IFA_LABEL]); else label = ll_idx_n2a(ifa->ifa_index, b1); if (fnmatch(filter.label, label, 0) != 0) return 0; } if (filter.pfx.family) { if (rta_tb[IFA_LOCAL]) { inet_prefix dst; memset(&dst, 0, sizeof(dst)); dst.family = ifa->ifa_family; memcpy(&dst.data, RTA_DATA(rta_tb[IFA_LOCAL]), RTA_PAYLOAD(rta_tb[IFA_LOCAL])); if (inet_addr_match(&dst, &filter.pfx, filter.pfx.bitlen)) 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_DELADDR; fn->nlmsg_flags = NLM_F_REQUEST; fn->nlmsg_seq = ++filter.rth->seq; filter.flushp = (((char*)fn) + n->nlmsg_len) - filter.flushb; filter.flushed++; return 0; } if (n->nlmsg_type == RTM_DELADDR) fprintf(fp, "Deleted "); if (filter.oneline) fprintf(fp, "%u: %s", ifa->ifa_index, ll_index_to_name(ifa->ifa_index)); if (ifa->ifa_family == AF_INET) fprintf(fp, " inet "); else if (ifa->ifa_family == AF_INET6) fprintf(fp, " inet6 "); else fprintf(fp, " family %d ", ifa->ifa_family); if (rta_tb[IFA_LOCAL]) { fprintf(fp, "%s", rt_addr_n2a(ifa->ifa_family, RTA_PAYLOAD(rta_tb[IFA_LOCAL]), RTA_DATA(rta_tb[IFA_LOCAL]), abuf, sizeof(abuf))); if (rta_tb[IFA_ADDRESS] == NULL || memcmp(RTA_DATA(rta_tb[IFA_ADDRESS]), RTA_DATA(rta_tb[IFA_LOCAL]), 4) == 0) { fprintf(fp, "/%d ", ifa->ifa_prefixlen); } else { fprintf(fp, " peer %s/%d ", rt_addr_n2a(ifa->ifa_family, RTA_PAYLOAD(rta_tb[IFA_ADDRESS]), RTA_DATA(rta_tb[IFA_ADDRESS]), abuf, sizeof(abuf)), ifa->ifa_prefixlen); } } if (rta_tb[IFA_BROADCAST]) { fprintf(fp, "brd %s ", rt_addr_n2a(ifa->ifa_family, RTA_PAYLOAD(rta_tb[IFA_BROADCAST]), RTA_DATA(rta_tb[IFA_BROADCAST]), abuf, sizeof(abuf))); } if (rta_tb[IFA_ANYCAST]) { fprintf(fp, "any %s ", rt_addr_n2a(ifa->ifa_family, RTA_PAYLOAD(rta_tb[IFA_ANYCAST]), RTA_DATA(rta_tb[IFA_ANYCAST]), abuf, sizeof(abuf))); } fprintf(fp, "scope %s ", rtnl_rtscope_n2a(ifa->ifa_scope, b1, sizeof(b1))); if (ifa->ifa_flags&IFA_F_SECONDARY) { ifa->ifa_flags &= ~IFA_F_SECONDARY; fprintf(fp, "secondary "); } if (ifa->ifa_flags&IFA_F_TENTATIVE) { ifa->ifa_flags &= ~IFA_F_TENTATIVE; fprintf(fp, "tentative "); } if (ifa->ifa_flags&IFA_F_DEPRECATED) { ifa->ifa_flags &= ~IFA_F_DEPRECATED; fprintf(fp, "deprecated "); } if (!(ifa->ifa_flags&IFA_F_PERMANENT)) { fprintf(fp, "dynamic "); } else ifa->ifa_flags &= ~IFA_F_PERMANENT; if (ifa->ifa_flags) fprintf(fp, "flags %02x ", ifa->ifa_flags); if (rta_tb[IFA_LABEL]) fprintf(fp, "%s", (char*)RTA_DATA(rta_tb[IFA_LABEL])); if (rta_tb[IFA_CACHEINFO]) { struct ifa_cacheinfo *ci = RTA_DATA(rta_tb[IFA_CACHEINFO]); char buf[128]; fprintf(fp, "%s", _SL_); if (ci->ifa_valid == 0xFFFFFFFFU) sprintf(buf, "valid_lft forever"); else sprintf(buf, "valid_lft %dsec", ci->ifa_valid); if (ci->ifa_prefered == 0xFFFFFFFFU) sprintf(buf+strlen(buf), " preferred_lft forever"); else sprintf(buf+strlen(buf), " preferred_lft %dsec", ci->ifa_prefered); fprintf(fp, " %s", buf); } fprintf(fp, "\n"); fflush(fp); return 0; } struct nlmsg_list { struct nlmsg_list *next; struct nlmsghdr h; }; static int print_selected_addrinfo(int ifindex, struct nlmsg_list *ainfo, FILE *fp) { for ( ;ainfo ; ainfo = ainfo->next) { struct nlmsghdr *n = &ainfo->h; struct ifaddrmsg *ifa = NLMSG_DATA(n); if (n->nlmsg_type != RTM_NEWADDR) continue; if (n->nlmsg_len < NLMSG_LENGTH(sizeof(ifa))) return -1; if (ifa->ifa_index != ifindex || (filter.family && filter.family != ifa->ifa_family)) continue; print_addrinfo(NULL, n, fp); } return 0; } static int store_nlmsg(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg) { struct nlmsg_list **linfo = (struct nlmsg_list**)arg; struct nlmsg_list *h; struct nlmsg_list **lp; h = malloc(n->nlmsg_len+sizeof(void*)); if (h == NULL) return -1; memcpy(&h->h, n, n->nlmsg_len); h->next = NULL; for (lp = linfo; *lp; lp = &(*lp)->next) /* NOTHING */; *lp = h; ll_remember_index(who, n, NULL); return 0; } static void ipaddr_reset_filter(int _oneline) { memset(&filter, 0, sizeof(filter)); filter.oneline = _oneline; } extern int ipaddr_list_or_flush(int argc, char **argv, int flush) { const char *option[] = { "to", "scope", "up", "label", "dev", 0 }; struct nlmsg_list *linfo = NULL; struct nlmsg_list *ainfo = NULL; struct nlmsg_list *l; struct rtnl_handle rth; char *filter_dev = NULL; int no_link = 0; ipaddr_reset_filter(oneline); filter.showqueue = 1; if (filter.family == AF_UNSPEC) filter.family = preferred_family; if (flush) { if (argc <= 0) { fprintf(stderr, "Flush requires arguments.\n"); return -1; } if (filter.family == AF_PACKET) { fprintf(stderr, "Cannot flush link addresses.\n"); return -1; } } while (argc > 0) { const int option_num = compare_string_array(option, *argv); switch (option_num) { case 0: /* to */ NEXT_ARG(); get_prefix(&filter.pfx, *argv, filter.family); if (filter.family == AF_UNSPEC) { filter.family = filter.pfx.family; } break; case 1: /* scope */ { uint32_t scope = 0; NEXT_ARG(); filter.scopemask = -1; if (rtnl_rtscope_a2n(&scope, *argv)) { if (strcmp(*argv, "all") != 0) { invarg("invalid \"scope\"\n", *argv); } scope = RT_SCOPE_NOWHERE; filter.scopemask = 0; } filter.scope = scope; break; } case 2: /* up */ filter.up = 1; break; case 3: /* label */ NEXT_ARG(); filter.label = *argv; break; case 4: /* dev */ NEXT_ARG(); default: if (filter_dev) { duparg2("dev", *argv); } filter_dev = *argv; } argv++; argc--; } if (rtnl_open(&rth, 0) < 0) exit(1); if (rtnl_wilddump_request(&rth, preferred_family, RTM_GETLINK) < 0) { bb_perror_msg_and_die("Cannot send dump request"); } if (rtnl_dump_filter(&rth, store_nlmsg, &linfo, NULL, NULL) < 0) { bb_error_msg_and_die("Dump terminated"); } if (filter_dev) { filter.ifindex = ll_name_to_index(filter_dev); if (filter.ifindex <= 0) { bb_error_msg("Device \"%s\" does not exist.", 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; for (;;) { if (rtnl_wilddump_request(&rth, filter.family, RTM_GETADDR) < 0) { perror("Cannot send dump request"); exit(1); } filter.flushed = 0; if (rtnl_dump_filter(&rth, print_addrinfo, stdout, NULL, NULL) < 0) { fprintf(stderr, "Flush terminated\n"); exit(1); } if (filter.flushed == 0) { #if 0 if (round == 0) fprintf(stderr, "Nothing to flush.\n"); #endif fflush(stdout); return 0; } round++; if (flush_update() < 0) exit(1); } } if (filter.family != AF_PACKET) { if (rtnl_wilddump_request(&rth, filter.family, RTM_GETADDR) < 0) { bb_perror_msg_and_die("Cannot send dump request"); } if (rtnl_dump_filter(&rth, store_nlmsg, &ainfo, NULL, NULL) < 0) { bb_error_msg_and_die("Dump terminated"); } } if (filter.family && filter.family != AF_PACKET) { struct nlmsg_list **lp; lp=&linfo; if (filter.oneline) no_link = 1; while ((l=*lp)!=NULL) { int ok = 0; struct ifinfomsg *ifi = NLMSG_DATA(&l->h); struct nlmsg_list *a; for (a=ainfo; a; a=a->next) { struct nlmsghdr *n = &a->h; struct ifaddrmsg *ifa = NLMSG_DATA(n); if (ifa->ifa_index != ifi->ifi_index || (filter.family && filter.family != ifa->ifa_family)) continue; if ((filter.scope^ifa->ifa_scope)&filter.scopemask) continue; if ((filter.flags^ifa->ifa_flags)&filter.flagmask) continue; if (filter.pfx.family || filter.label) { struct rtattr *tb[IFA_MAX+1]; memset(tb, 0, sizeof(tb)); parse_rtattr(tb, IFA_MAX, IFA_RTA(ifa), IFA_PAYLOAD(n)); if (!tb[IFA_LOCAL]) tb[IFA_LOCAL] = tb[IFA_ADDRESS]; if (filter.pfx.family && tb[IFA_LOCAL]) { inet_prefix dst; memset(&dst, 0, sizeof(dst)); dst.family = ifa->ifa_family; memcpy(&dst.data, RTA_DATA(tb[IFA_LOCAL]), RTA_PAYLOAD(tb[IFA_LOCAL])); if (inet_addr_match(&dst, &filter.pfx, filter.pfx.bitlen)) continue; } if (filter.label) { SPRINT_BUF(b1); const char *label; if (tb[IFA_LABEL]) label = RTA_DATA(tb[IFA_LABEL]); else label = ll_idx_n2a(ifa->ifa_index, b1); if (fnmatch(filter.label, label, 0) != 0) continue; } } ok = 1; break; } if (!ok) *lp = l->next; else lp = &l->next; } } for (l=linfo; l; l = l->next) { if (no_link || print_linkinfo(NULL, &l->h, stdout) == 0) { struct ifinfomsg *ifi = NLMSG_DATA(&l->h); if (filter.family != AF_PACKET) print_selected_addrinfo(ifi->ifi_index, ainfo, stdout); } fflush(stdout); } exit(0); } static int default_scope(inet_prefix *lcl) { if (lcl->family == AF_INET) { if (lcl->bytelen >= 1 && *(__u8*)&lcl->data == 127) return RT_SCOPE_HOST; } return 0; } static int ipaddr_modify(int cmd, int argc, char **argv) { const char *option[] = { "peer", "remote", "broadcast", "brd", "anycast", "scope", "dev", "label", "local", 0 }; struct rtnl_handle rth; struct { struct nlmsghdr n; struct ifaddrmsg ifa; char buf[256]; } req; char *d = NULL; char *l = NULL; inet_prefix lcl; inet_prefix peer; int local_len = 0; int peer_len = 0; int brd_len = 0; int any_len = 0; int scoped = 0; memset(&req, 0, sizeof(req)); req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg)); req.n.nlmsg_flags = NLM_F_REQUEST; req.n.nlmsg_type = cmd; req.ifa.ifa_family = preferred_family; while (argc > 0) { const int option_num = compare_string_array(option, *argv); switch (option_num) { case 0: /* peer */ case 1: /* remote */ NEXT_ARG(); if (peer_len) { duparg("peer", *argv); } get_prefix(&peer, *argv, req.ifa.ifa_family); peer_len = peer.bytelen; if (req.ifa.ifa_family == AF_UNSPEC) { req.ifa.ifa_family = peer.family; } addattr_l(&req.n, sizeof(req), IFA_ADDRESS, &peer.data, peer.bytelen); req.ifa.ifa_prefixlen = peer.bitlen; break; case 2: /* broadcast */ case 3: /* brd */ { inet_prefix addr; NEXT_ARG(); if (brd_len) { duparg("broadcast", *argv); } if (strcmp(*argv, "+") == 0) { brd_len = -1; } else if (strcmp(*argv, "-") == 0) { brd_len = -2; } else { get_addr(&addr, *argv, req.ifa.ifa_family); if (req.ifa.ifa_family == AF_UNSPEC) req.ifa.ifa_family = addr.family; addattr_l(&req.n, sizeof(req), IFA_BROADCAST, &addr.data, addr.bytelen); brd_len = addr.bytelen; } break; } case 4: /* anycast */ { inet_prefix addr; NEXT_ARG(); if (any_len) { duparg("anycast", *argv); } get_addr(&addr, *argv, req.ifa.ifa_family); if (req.ifa.ifa_family == AF_UNSPEC) { req.ifa.ifa_family = addr.family; } addattr_l(&req.n, sizeof(req), IFA_ANYCAST, &addr.data, addr.bytelen); any_len = addr.bytelen; break; } case 5: /* scope */ { uint32_t scope = 0; NEXT_ARG(); if (rtnl_rtscope_a2n(&scope, *argv)) { invarg(*argv, "invalid scope value."); } req.ifa.ifa_scope = scope; scoped = 1; break; } case 6: /* dev */ NEXT_ARG(); d = *argv; break; case 7: /* label */ NEXT_ARG(); l = *argv; addattr_l(&req.n, sizeof(req), IFA_LABEL, l, strlen(l)+1); break; case 8: /* local */ NEXT_ARG(); default: if (local_len) { duparg2("local", *argv); } get_prefix(&lcl, *argv, req.ifa.ifa_family); if (req.ifa.ifa_family == AF_UNSPEC) { req.ifa.ifa_family = lcl.family; } addattr_l(&req.n, sizeof(req), IFA_LOCAL, &lcl.data, lcl.bytelen); local_len = lcl.bytelen; } argc--; argv++; } if (d == NULL) { bb_error_msg("Not enough information: \"dev\" argument is required."); return -1; } if (l && matches(d, l) != 0) { bb_error_msg_and_die("\"dev\" (%s) must match \"label\" (%s).", d, l); } if (peer_len == 0 && local_len && cmd != RTM_DELADDR) { peer = lcl; addattr_l(&req.n, sizeof(req), IFA_ADDRESS, &lcl.data, lcl.bytelen); } if (req.ifa.ifa_prefixlen == 0) req.ifa.ifa_prefixlen = lcl.bitlen; if (brd_len < 0 && cmd != RTM_DELADDR) { inet_prefix brd; int i; if (req.ifa.ifa_family != AF_INET) { bb_error_msg("Broadcast can be set only for IPv4 addresses"); return -1; } brd = peer; if (brd.bitlen <= 30) { for (i=31; i>=brd.bitlen; i--) { if (brd_len == -1) brd.data[0] |= htonl(1<<(31-i)); else brd.data[0] &= ~htonl(1<<(31-i)); } addattr_l(&req.n, sizeof(req), IFA_BROADCAST, &brd.data, brd.bytelen); brd_len = brd.bytelen; } } if (!scoped && cmd != RTM_DELADDR) req.ifa.ifa_scope = default_scope(&lcl); if (rtnl_open(&rth, 0) < 0) exit(1); ll_init_map(&rth); if ((req.ifa.ifa_index = ll_name_to_index(d)) == 0) { bb_error_msg("Cannot find device \"%s\"", d); return -1; } if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0) exit(2); exit(0); } extern int do_ipaddr(int argc, char **argv) { const char *commands[] = { "add", "delete", "list", "show", "lst", "flush", 0 }; int command_num = 2; if (*argv) { command_num = compare_string_array(commands, *argv); } switch (command_num) { case 0: /* add */ return ipaddr_modify(RTM_NEWADDR, argc-1, argv+1); case 1: /* delete */ return ipaddr_modify(RTM_DELADDR, argc-1, argv+1); case 2: /* list */ case 3: /* show */ case 4: /* lst */ return ipaddr_list_or_flush(argc-1, argv+1, 0); case 5: /* flush */ return ipaddr_list_or_flush(argc-1, argv+1, 1); } bb_error_msg_and_die("Unknown command %s", *argv); }