/* vi: set sw=4 ts=4: */ /* * iproute.c "ip route". * * Licensed under the GPL v2 or later, see the file LICENSE in this tarball. * * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> * * * Changes: * * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses * Kunihiro Ishiguro <kunihiro@zebra.org> 001102: rtnh_ifindex was not initialized */ #include "ip_common.h" /* #include "libbb.h" is inside */ #include "rt_names.h" #include "utils.h" #ifndef RTAX_RTTVAR #define RTAX_RTTVAR RTAX_HOPS #endif typedef struct filter_t { int tb; smallint flushed; char *flushb; int flushp; int flushe; struct rtnl_handle *rth; int protocol, protocolmask; int scope, scopemask; int type, typemask; int tos, tosmask; int iif, iifmask; int oif, oifmask; int realm, realmmask; inet_prefix rprefsrc; inet_prefix rvia; inet_prefix rdst; inet_prefix mdst; inet_prefix rsrc; inet_prefix msrc; } filter_t; #define filter (*(filter_t*)&bb_common_bufsiz1) static int flush_update(void) { if (rtnl_send(filter.rth, filter.flushb, filter.flushp) < 0) { bb_perror_msg("failed to send flush request"); return -1; } filter.flushp = 0; 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 = sysconf(_SC_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) { struct rtmsg *r = NLMSG_DATA(n); int len = n->nlmsg_len; struct rtattr * tb[RTA_MAX+1]; char abuf[256]; inet_prefix dst; inet_prefix src; int host_len = -1; SPRINT_BUF(b1); if (n->nlmsg_type != RTM_NEWROUTE && n->nlmsg_type != RTM_DELROUTE) { fprintf(stderr, "Not a route: %08x %08x %08x\n", n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags); return 0; } if (filter.flushb && n->nlmsg_type != RTM_NEWROUTE) return 0; len -= NLMSG_LENGTH(sizeof(*r)); if (len < 0) bb_error_msg_and_die("wrong nlmsg len %d", len); if (r->rtm_family == AF_INET6) host_len = 128; else if (r->rtm_family == AF_INET) host_len = 32; if (r->rtm_family == AF_INET6) { if (filter.tb) { if (filter.tb < 0) { if (!(r->rtm_flags & RTM_F_CLONED)) { return 0; } } else { if (r->rtm_flags & RTM_F_CLONED) { return 0; } if (filter.tb == RT_TABLE_LOCAL) { if (r->rtm_type != RTN_LOCAL) { return 0; } } else if (filter.tb == RT_TABLE_MAIN) { if (r->rtm_type == RTN_LOCAL) { return 0; } } else { return 0; } } } } else { if (filter.tb > 0 && filter.tb != r->rtm_table) { return 0; } } if (filter.rdst.family && (r->rtm_family != filter.rdst.family || filter.rdst.bitlen > r->rtm_dst_len)) { return 0; } if (filter.mdst.family && (r->rtm_family != filter.mdst.family || (filter.mdst.bitlen >= 0 && filter.mdst.bitlen < r->rtm_dst_len))) { return 0; } if (filter.rsrc.family && (r->rtm_family != filter.rsrc.family || filter.rsrc.bitlen > r->rtm_src_len)) { return 0; } if (filter.msrc.family && (r->rtm_family != filter.msrc.family || (filter.msrc.bitlen >= 0 && filter.msrc.bitlen < r->rtm_src_len))) { return 0; } memset(tb, 0, sizeof(tb)); parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len); if (filter.rdst.family && inet_addr_match(&dst, &filter.rdst, filter.rdst.bitlen)) return 0; if (filter.mdst.family && filter.mdst.bitlen >= 0 && inet_addr_match(&dst, &filter.mdst, r->rtm_dst_len)) return 0; if (filter.rsrc.family && inet_addr_match(&src, &filter.rsrc, filter.rsrc.bitlen)) return 0; if (filter.msrc.family && filter.msrc.bitlen >= 0 && inet_addr_match(&src, &filter.msrc, r->rtm_src_len)) return 0; if (filter.flushb && r->rtm_family == AF_INET6 && r->rtm_dst_len == 0 && r->rtm_type == RTN_UNREACHABLE && tb[RTA_PRIORITY] && *(int*)RTA_DATA(tb[RTA_PRIORITY]) == -1) return 0; if (filter.flushb) { struct nlmsghdr *fn; if (NLMSG_ALIGN(filter.flushp) + n->nlmsg_len > filter.flushe) { if (flush_update()) bb_error_msg_and_die("flush"); } fn = (struct nlmsghdr*)(filter.flushb + NLMSG_ALIGN(filter.flushp)); memcpy(fn, n, n->nlmsg_len); fn->nlmsg_type = RTM_DELROUTE; fn->nlmsg_flags = NLM_F_REQUEST; fn->nlmsg_seq = ++filter.rth->seq; filter.flushp = (((char*)fn) + n->nlmsg_len) - filter.flushb; filter.flushed = 1; return 0; } if (n->nlmsg_type == RTM_DELROUTE) { printf("Deleted "); } if (r->rtm_type != RTN_UNICAST && !filter.type) { printf("%s ", rtnl_rtntype_n2a(r->rtm_type, b1)); } if (tb[RTA_DST]) { if (r->rtm_dst_len != host_len) { printf("%s/%u ", rt_addr_n2a(r->rtm_family, RTA_DATA(tb[RTA_DST]), abuf, sizeof(abuf)), r->rtm_dst_len ); } else { printf("%s ", format_host(r->rtm_family, RTA_PAYLOAD(tb[RTA_DST]), RTA_DATA(tb[RTA_DST]), abuf, sizeof(abuf)) ); } } else if (r->rtm_dst_len) { printf("0/%d ", r->rtm_dst_len); } else { printf("default "); } if (tb[RTA_SRC]) { if (r->rtm_src_len != host_len) { printf("from %s/%u ", rt_addr_n2a(r->rtm_family, RTA_DATA(tb[RTA_SRC]), abuf, sizeof(abuf)), r->rtm_src_len ); } else { printf("from %s ", format_host(r->rtm_family, RTA_PAYLOAD(tb[RTA_SRC]), RTA_DATA(tb[RTA_SRC]), abuf, sizeof(abuf)) ); } } else if (r->rtm_src_len) { printf("from 0/%u ", r->rtm_src_len); } if (tb[RTA_GATEWAY] && filter.rvia.bitlen != host_len) { printf("via %s ", format_host(r->rtm_family, RTA_PAYLOAD(tb[RTA_GATEWAY]), RTA_DATA(tb[RTA_GATEWAY]), abuf, sizeof(abuf))); } if (tb[RTA_OIF] && filter.oifmask != -1) { printf("dev %s ", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_OIF]))); } if (tb[RTA_PREFSRC] && filter.rprefsrc.bitlen != host_len) { /* Do not use format_host(). It is our local addr and symbolic name will not be useful. */ printf(" src %s ", rt_addr_n2a(r->rtm_family, RTA_DATA(tb[RTA_PREFSRC]), abuf, sizeof(abuf))); } if (tb[RTA_PRIORITY]) { printf(" metric %d ", *(uint32_t*)RTA_DATA(tb[RTA_PRIORITY])); } if (r->rtm_family == AF_INET6) { struct rta_cacheinfo *ci = NULL; if (tb[RTA_CACHEINFO]) { ci = RTA_DATA(tb[RTA_CACHEINFO]); } if ((r->rtm_flags & RTM_F_CLONED) || (ci && ci->rta_expires)) { if (r->rtm_flags & RTM_F_CLONED) { printf("%c cache ", _SL_); } if (ci->rta_expires) { printf(" expires %dsec", ci->rta_expires / get_hz()); } if (ci->rta_error != 0) { printf(" error %d", ci->rta_error); } } else if (ci) { if (ci->rta_error != 0) printf(" error %d", ci->rta_error); } } if (tb[RTA_IIF] && filter.iifmask != -1) { printf(" iif %s", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_IIF]))); } bb_putchar('\n'); return 0; } /* Return value becomes exitcode. It's okay to not return at all */ static int iproute_modify(int cmd, unsigned flags, char **argv) { static const char keywords[] ALIGN1 = "src\0""via\0""mtu\0""lock\0""protocol\0"IF_FEATURE_IP_RULE("table\0") "dev\0""oif\0""to\0""metric\0"; enum { ARG_src, ARG_via, ARG_mtu, PARM_lock, ARG_protocol, IF_FEATURE_IP_RULE(ARG_table,) ARG_dev, ARG_oif, ARG_to, ARG_metric, }; enum { gw_ok = 1 << 0, dst_ok = 1 << 1, proto_ok = 1 << 2, type_ok = 1 << 3 }; struct rtnl_handle rth; struct { struct nlmsghdr n; struct rtmsg r; char buf[1024]; } req; char mxbuf[256]; struct rtattr * mxrta = (void*)mxbuf; unsigned mxlock = 0; char *d = NULL; smalluint ok = 0; int arg; memset(&req, 0, sizeof(req)); req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)); req.n.nlmsg_flags = NLM_F_REQUEST | flags; req.n.nlmsg_type = cmd; req.r.rtm_family = preferred_family; if (RT_TABLE_MAIN) /* if it is zero, memset already did it */ req.r.rtm_table = RT_TABLE_MAIN; if (RT_SCOPE_NOWHERE) req.r.rtm_scope = RT_SCOPE_NOWHERE; if (cmd != RTM_DELROUTE) { req.r.rtm_protocol = RTPROT_BOOT; req.r.rtm_scope = RT_SCOPE_UNIVERSE; req.r.rtm_type = RTN_UNICAST; } mxrta->rta_type = RTA_METRICS; mxrta->rta_len = RTA_LENGTH(0); while (*argv) { arg = index_in_substrings(keywords, *argv); if (arg == ARG_src) { inet_prefix addr; NEXT_ARG(); get_addr(&addr, *argv, req.r.rtm_family); if (req.r.rtm_family == AF_UNSPEC) req.r.rtm_family = addr.family; addattr_l(&req.n, sizeof(req), RTA_PREFSRC, &addr.data, addr.bytelen); } else if (arg == ARG_via) { inet_prefix addr; ok |= gw_ok; NEXT_ARG(); get_addr(&addr, *argv, req.r.rtm_family); if (req.r.rtm_family == AF_UNSPEC) { req.r.rtm_family = addr.family; } addattr_l(&req.n, sizeof(req), RTA_GATEWAY, &addr.data, addr.bytelen); } else if (arg == ARG_mtu) { unsigned mtu; NEXT_ARG(); if (index_in_strings(keywords, *argv) == PARM_lock) { mxlock |= (1 << RTAX_MTU); NEXT_ARG(); } mtu = get_unsigned(*argv, "mtu"); rta_addattr32(mxrta, sizeof(mxbuf), RTAX_MTU, mtu); } else if (arg == ARG_protocol) { uint32_t prot; NEXT_ARG(); if (rtnl_rtprot_a2n(&prot, *argv)) invarg(*argv, "protocol"); req.r.rtm_protocol = prot; ok |= proto_ok; #if ENABLE_FEATURE_IP_RULE } else if (arg == ARG_table) { uint32_t tid; NEXT_ARG(); if (rtnl_rttable_a2n(&tid, *argv)) invarg(*argv, "table"); req.r.rtm_table = tid; #endif } else if (arg == ARG_dev || arg == ARG_oif) { NEXT_ARG(); d = *argv; } else if (arg == ARG_metric) { uint32_t metric; NEXT_ARG(); metric = get_u32(*argv, "metric"); addattr32(&req.n, sizeof(req), RTA_PRIORITY, metric); } else { int type; inet_prefix dst; if (arg == ARG_to) { NEXT_ARG(); } if ((**argv < '0' || **argv > '9') && rtnl_rtntype_a2n(&type, *argv) == 0) { NEXT_ARG(); req.r.rtm_type = type; ok |= type_ok; } if (ok & dst_ok) { duparg2("to", *argv); } get_prefix(&dst, *argv, req.r.rtm_family); if (req.r.rtm_family == AF_UNSPEC) { req.r.rtm_family = dst.family; } req.r.rtm_dst_len = dst.bitlen; ok |= dst_ok; if (dst.bytelen) { addattr_l(&req.n, sizeof(req), RTA_DST, &dst.data, dst.bytelen); } } argv++; } xrtnl_open(&rth); if (d) { int idx; ll_init_map(&rth); if (d) { idx = xll_name_to_index(d); addattr32(&req.n, sizeof(req), RTA_OIF, idx); } } if (mxrta->rta_len > RTA_LENGTH(0)) { if (mxlock) { rta_addattr32(mxrta, sizeof(mxbuf), RTAX_LOCK, mxlock); } addattr_l(&req.n, sizeof(req), RTA_METRICS, RTA_DATA(mxrta), RTA_PAYLOAD(mxrta)); } if (req.r.rtm_type == RTN_LOCAL || req.r.rtm_type == RTN_NAT) req.r.rtm_scope = RT_SCOPE_HOST; else if (req.r.rtm_type == RTN_BROADCAST || req.r.rtm_type == RTN_MULTICAST || req.r.rtm_type == RTN_ANYCAST) req.r.rtm_scope = RT_SCOPE_LINK; else if (req.r.rtm_type == RTN_UNICAST || req.r.rtm_type == RTN_UNSPEC) { if (cmd == RTM_DELROUTE) req.r.rtm_scope = RT_SCOPE_NOWHERE; else if (!(ok & gw_ok)) req.r.rtm_scope = RT_SCOPE_LINK; } if (req.r.rtm_family == AF_UNSPEC) { req.r.rtm_family = AF_INET; } if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0) { return 2; } return 0; } static int rtnl_rtcache_request(struct rtnl_handle *rth, int family) { struct { struct nlmsghdr nlh; struct rtmsg rtm; } req; struct sockaddr_nl nladdr; memset(&nladdr, 0, sizeof(nladdr)); memset(&req, 0, sizeof(req)); nladdr.nl_family = AF_NETLINK; req.nlh.nlmsg_len = sizeof(req); if (RTM_GETROUTE) req.nlh.nlmsg_type = RTM_GETROUTE; if (NLM_F_ROOT | NLM_F_REQUEST) req.nlh.nlmsg_flags = NLM_F_ROOT | NLM_F_REQUEST; /*req.nlh.nlmsg_pid = 0; - memset did it already */ req.nlh.nlmsg_seq = rth->dump = ++rth->seq; req.rtm.rtm_family = family; if (RTM_F_CLONED) req.rtm.rtm_flags = RTM_F_CLONED; return xsendto(rth->fd, (void*)&req, sizeof(req), (struct sockaddr*)&nladdr, sizeof(nladdr)); } static void iproute_flush_cache(void) { static const char fn[] ALIGN1 = "/proc/sys/net/ipv4/route/flush"; int flush_fd = open_or_warn(fn, O_WRONLY); if (flush_fd < 0) { return; } if (write(flush_fd, "-1", 2) < 2) { bb_perror_msg("can't flush routing cache"); return; } close(flush_fd); } static void iproute_reset_filter(void) { memset(&filter, 0, sizeof(filter)); filter.mdst.bitlen = -1; filter.msrc.bitlen = -1; } /* Return value becomes exitcode. It's okay to not return at all */ static int iproute_list_or_flush(char **argv, int flush) { int do_ipv6 = preferred_family; struct rtnl_handle rth; char *id = NULL; char *od = NULL; static const char keywords[] ALIGN1 = /* "ip route list/flush" parameters: */ "protocol\0" "dev\0" "oif\0" "iif\0" "via\0" "table\0" "cache\0" "from\0" "to\0" /* and possible further keywords */ "all\0" "root\0" "match\0" "exact\0" "main\0" ; enum { KW_proto, KW_dev, KW_oif, KW_iif, KW_via, KW_table, KW_cache, KW_from, KW_to, /* */ KW_all, KW_root, KW_match, KW_exact, KW_main, }; int arg, parm; iproute_reset_filter(); filter.tb = RT_TABLE_MAIN; if (flush && !*argv) bb_error_msg_and_die(bb_msg_requires_arg, "\"ip route flush\""); while (*argv) { arg = index_in_substrings(keywords, *argv); if (arg == KW_proto) { uint32_t prot = 0; NEXT_ARG(); filter.protocolmask = -1; if (rtnl_rtprot_a2n(&prot, *argv)) { if (index_in_strings(keywords, *argv) != KW_all) invarg(*argv, "protocol"); prot = 0; filter.protocolmask = 0; } filter.protocol = prot; } else if (arg == KW_dev || arg == KW_oif) { NEXT_ARG(); od = *argv; } else if (arg == KW_iif) { NEXT_ARG(); id = *argv; } else if (arg == KW_via) { NEXT_ARG(); get_prefix(&filter.rvia, *argv, do_ipv6); } else if (arg == KW_table) { /* table all/cache/main */ NEXT_ARG(); parm = index_in_substrings(keywords, *argv); if (parm == KW_cache) filter.tb = -1; else if (parm == KW_all) filter.tb = 0; else if (parm != KW_main) { #if ENABLE_FEATURE_IP_RULE uint32_t tid; if (rtnl_rttable_a2n(&tid, *argv)) invarg(*argv, "table"); filter.tb = tid; #else invarg(*argv, "table"); #endif } } else if (arg == KW_cache) { /* The command 'ip route flush cache' is used by OpenSWAN. * Assuming it's a synonym for 'ip route flush table cache' */ filter.tb = -1; } else if (arg == KW_from) { NEXT_ARG(); parm = index_in_substrings(keywords, *argv); if (parm == KW_root) { NEXT_ARG(); get_prefix(&filter.rsrc, *argv, do_ipv6); } else if (parm == KW_match) { NEXT_ARG(); get_prefix(&filter.msrc, *argv, do_ipv6); } else { if (parm == KW_exact) NEXT_ARG(); get_prefix(&filter.msrc, *argv, do_ipv6); filter.rsrc = filter.msrc; } } else { /* "to" is the default parameter */ if (arg == KW_to) { NEXT_ARG(); arg = index_in_substrings(keywords, *argv); } /* parm = arg; - would be more plausible, but we reuse 'arg' here */ if (arg == KW_root) { NEXT_ARG(); get_prefix(&filter.rdst, *argv, do_ipv6); } else if (arg == KW_match) { NEXT_ARG(); get_prefix(&filter.mdst, *argv, do_ipv6); } else { /* "to exact" is the default */ if (arg == KW_exact) NEXT_ARG(); get_prefix(&filter.mdst, *argv, do_ipv6); filter.rdst = filter.mdst; } } argv++; } if (do_ipv6 == AF_UNSPEC && filter.tb) { do_ipv6 = AF_INET; } xrtnl_open(&rth); ll_init_map(&rth); if (id || od) { int idx; if (id) { idx = xll_name_to_index(id); filter.iif = idx; filter.iifmask = -1; } if (od) { idx = xll_name_to_index(od); filter.oif = idx; filter.oifmask = -1; } } if (flush) { char flushb[4096-512]; if (filter.tb == -1) { /* "flush table cache" */ if (do_ipv6 != AF_INET6) iproute_flush_cache(); if (do_ipv6 == AF_INET) return 0; } filter.flushb = flushb; filter.flushp = 0; filter.flushe = sizeof(flushb); filter.rth = &rth; for (;;) { xrtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE); filter.flushed = 0; xrtnl_dump_filter(&rth, print_route, NULL); if (filter.flushed == 0) return 0; if (flush_update()) return 1; } } if (filter.tb != -1) { xrtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE); } else if (rtnl_rtcache_request(&rth, do_ipv6) < 0) { bb_perror_msg_and_die("can't send dump request"); } xrtnl_dump_filter(&rth, print_route, NULL); return 0; } /* Return value becomes exitcode. It's okay to not return at all */ static int iproute_get(char **argv) { struct rtnl_handle rth; struct { struct nlmsghdr n; struct rtmsg r; char buf[1024]; } req; char *idev = NULL; char *odev = NULL; bool connected = 0; bool from_ok = 0; static const char options[] ALIGN1 = "from\0""iif\0""oif\0""dev\0""notify\0""connected\0""to\0"; memset(&req, 0, sizeof(req)); iproute_reset_filter(); req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)); if (NLM_F_REQUEST) req.n.nlmsg_flags = NLM_F_REQUEST; if (RTM_GETROUTE) req.n.nlmsg_type = RTM_GETROUTE; req.r.rtm_family = preferred_family; /*req.r.rtm_table = 0; - memset did this already */ /*req.r.rtm_protocol = 0;*/ /*req.r.rtm_scope = 0;*/ /*req.r.rtm_type = 0;*/ /*req.r.rtm_src_len = 0;*/ /*req.r.rtm_dst_len = 0;*/ /*req.r.rtm_tos = 0;*/ while (*argv) { switch (index_in_strings(options, *argv)) { case 0: /* from */ { inet_prefix addr; NEXT_ARG(); from_ok = 1; get_prefix(&addr, *argv, req.r.rtm_family); if (req.r.rtm_family == AF_UNSPEC) { req.r.rtm_family = addr.family; } if (addr.bytelen) { addattr_l(&req.n, sizeof(req), RTA_SRC, &addr.data, addr.bytelen); } req.r.rtm_src_len = addr.bitlen; break; } case 1: /* iif */ NEXT_ARG(); idev = *argv; break; case 2: /* oif */ case 3: /* dev */ NEXT_ARG(); odev = *argv; break; case 4: /* notify */ req.r.rtm_flags |= RTM_F_NOTIFY; break; case 5: /* connected */ connected = 1; break; case 6: /* to */ NEXT_ARG(); default: { inet_prefix addr; get_prefix(&addr, *argv, req.r.rtm_family); if (req.r.rtm_family == AF_UNSPEC) { req.r.rtm_family = addr.family; } if (addr.bytelen) { addattr_l(&req.n, sizeof(req), RTA_DST, &addr.data, addr.bytelen); } req.r.rtm_dst_len = addr.bitlen; } argv++; } } if (req.r.rtm_dst_len == 0) { bb_error_msg_and_die("need at least destination address"); } xrtnl_open(&rth); ll_init_map(&rth); if (idev || odev) { int idx; if (idev) { idx = xll_name_to_index(idev); addattr32(&req.n, sizeof(req), RTA_IIF, idx); } if (odev) { idx = xll_name_to_index(odev); addattr32(&req.n, sizeof(req), RTA_OIF, idx); } } if (req.r.rtm_family == AF_UNSPEC) { req.r.rtm_family = AF_INET; } if (rtnl_talk(&rth, &req.n, 0, 0, &req.n, NULL, NULL) < 0) { return 2; } if (connected && !from_ok) { struct rtmsg *r = NLMSG_DATA(&req.n); int len = req.n.nlmsg_len; struct rtattr * tb[RTA_MAX+1]; print_route(NULL, &req.n, NULL); if (req.n.nlmsg_type != RTM_NEWROUTE) { bb_error_msg_and_die("not a route?"); } len -= NLMSG_LENGTH(sizeof(*r)); if (len < 0) { bb_error_msg_and_die("wrong len %d", len); } memset(tb, 0, sizeof(tb)); parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len); if (tb[RTA_PREFSRC]) { tb[RTA_PREFSRC]->rta_type = RTA_SRC; r->rtm_src_len = 8*RTA_PAYLOAD(tb[RTA_PREFSRC]); } else if (!tb[RTA_SRC]) { bb_error_msg_and_die("failed to connect the route"); } if (!odev && tb[RTA_OIF]) { tb[RTA_OIF]->rta_type = 0; } if (tb[RTA_GATEWAY]) { tb[RTA_GATEWAY]->rta_type = 0; } if (!idev && tb[RTA_IIF]) { tb[RTA_IIF]->rta_type = 0; } req.n.nlmsg_flags = NLM_F_REQUEST; req.n.nlmsg_type = RTM_GETROUTE; if (rtnl_talk(&rth, &req.n, 0, 0, &req.n, NULL, NULL) < 0) { return 2; } } print_route(NULL, &req.n, NULL); return 0; } /* Return value becomes exitcode. It's okay to not return at all */ int do_iproute(char **argv) { static const char ip_route_commands[] ALIGN1 = /*0-3*/ "add\0""append\0""change\0""chg\0" /*4-7*/ "delete\0""get\0""list\0""show\0" /*8..*/ "prepend\0""replace\0""test\0""flush\0"; int command_num; unsigned flags = 0; int cmd = RTM_NEWROUTE; if (!*argv) return iproute_list_or_flush(argv, 0); /* "Standard" 'ip r a' treats 'a' as 'add', not 'append' */ /* It probably means that it is using "first match" rule */ command_num = index_in_substrings(ip_route_commands, *argv); switch (command_num) { case 0: /* add */ flags = NLM_F_CREATE|NLM_F_EXCL; break; case 1: /* append */ flags = NLM_F_CREATE|NLM_F_APPEND; break; case 2: /* change */ case 3: /* chg */ flags = NLM_F_REPLACE; break; case 4: /* delete */ cmd = RTM_DELROUTE; break; case 5: /* get */ return iproute_get(argv+1); case 6: /* list */ case 7: /* show */ return iproute_list_or_flush(argv+1, 0); case 8: /* prepend */ flags = NLM_F_CREATE; break; case 9: /* replace */ flags = NLM_F_CREATE|NLM_F_REPLACE; break; case 10: /* test */ flags = NLM_F_EXCL; break; case 11: /* flush */ return iproute_list_or_flush(argv+1, 1); default: bb_error_msg_and_die("unknown command %s", *argv); } return iproute_modify(cmd, flags, argv+1); }