| /* vi: set sw=4 ts=4: */ |
| /* |
| * iprule.c "ip rule". |
| * |
| * 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 |
| * initially integrated into busybox by Bernhard Fischer |
| */ |
| |
| #include <syslog.h> |
| //#include <sys/socket.h> |
| #include <netinet/in.h> |
| #include <netinet/ip.h> |
| #include <arpa/inet.h> |
| |
| #include "ip_common.h" /* #include "libbb.h" is inside */ |
| #include "rt_names.h" |
| #include "utils.h" |
| |
| /* |
| static void usage(void) __attribute__((noreturn)); |
| |
| static void usage(void) |
| { |
| fprintf(stderr, "Usage: ip rule [ list | add | del ] SELECTOR ACTION\n"); |
| fprintf(stderr, "SELECTOR := [ from PREFIX ] [ to PREFIX ] [ tos TOS ] [ fwmark FWMARK ]\n"); |
| fprintf(stderr, " [ dev STRING ] [ pref NUMBER ]\n"); |
| fprintf(stderr, "ACTION := [ table TABLE_ID ] [ nat ADDRESS ]\n"); |
| fprintf(stderr, " [ prohibit | reject | unreachable ]\n"); |
| fprintf(stderr, " [ realms [SRCREALM/]DSTREALM ]\n"); |
| fprintf(stderr, "TABLE_ID := [ local | main | default | NUMBER ]\n"); |
| exit(-1); |
| } |
| */ |
| |
| static int print_rule(struct sockaddr_nl *who ATTRIBUTE_UNUSED, |
| struct nlmsghdr *n, void *arg) |
| { |
| FILE *fp = (FILE*)arg; |
| struct rtmsg *r = NLMSG_DATA(n); |
| int len = n->nlmsg_len; |
| int host_len = -1; |
| struct rtattr * tb[RTA_MAX+1]; |
| char abuf[256]; |
| SPRINT_BUF(b1); |
| |
| if (n->nlmsg_type != RTM_NEWRULE) |
| return 0; |
| |
| len -= NLMSG_LENGTH(sizeof(*r)); |
| if (len < 0) |
| return -1; |
| |
| memset(tb, 0, sizeof(tb)); |
| parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len); |
| |
| if (r->rtm_family == AF_INET) |
| host_len = 32; |
| else if (r->rtm_family == AF_INET6) |
| host_len = 128; |
| /* else if (r->rtm_family == AF_DECnet) |
| host_len = 16; |
| else if (r->rtm_family == AF_IPX) |
| host_len = 80; |
| */ |
| if (tb[RTA_PRIORITY]) |
| fprintf(fp, "%u:\t", *(unsigned*)RTA_DATA(tb[RTA_PRIORITY])); |
| else |
| fprintf(fp, "0:\t"); |
| |
| fprintf(fp, "from "); |
| if (tb[RTA_SRC]) { |
| if (r->rtm_src_len != host_len) { |
| fprintf(fp, "%s/%u", rt_addr_n2a(r->rtm_family, |
| RTA_PAYLOAD(tb[RTA_SRC]), |
| RTA_DATA(tb[RTA_SRC]), |
| abuf, sizeof(abuf)), |
| r->rtm_src_len |
| ); |
| } else { |
| fputs(format_host(r->rtm_family, |
| RTA_PAYLOAD(tb[RTA_SRC]), |
| RTA_DATA(tb[RTA_SRC]), |
| abuf, sizeof(abuf)), fp); |
| } |
| } else if (r->rtm_src_len) { |
| fprintf(fp, "0/%d", r->rtm_src_len); |
| } else { |
| fprintf(fp, "all"); |
| } |
| fprintf(fp, " "); |
| |
| if (tb[RTA_DST]) { |
| if (r->rtm_dst_len != host_len) { |
| fprintf(fp, "to %s/%u ", rt_addr_n2a(r->rtm_family, |
| RTA_PAYLOAD(tb[RTA_DST]), |
| RTA_DATA(tb[RTA_DST]), |
| abuf, sizeof(abuf)), |
| r->rtm_dst_len |
| ); |
| } else { |
| fprintf(fp, "to %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) { |
| fprintf(fp, "to 0/%d ", r->rtm_dst_len); |
| } |
| |
| if (r->rtm_tos) { |
| fprintf(fp, "tos %s ", rtnl_dsfield_n2a(r->rtm_tos, b1, sizeof(b1))); |
| } |
| if (tb[RTA_PROTOINFO]) { |
| fprintf(fp, "fwmark %#x ", *(uint32_t*)RTA_DATA(tb[RTA_PROTOINFO])); |
| } |
| |
| if (tb[RTA_IIF]) { |
| fprintf(fp, "iif %s ", (char*)RTA_DATA(tb[RTA_IIF])); |
| } |
| |
| if (r->rtm_table) |
| fprintf(fp, "lookup %s ", rtnl_rttable_n2a(r->rtm_table, b1, sizeof(b1))); |
| |
| if (tb[RTA_FLOW]) { |
| uint32_t to = *(uint32_t*)RTA_DATA(tb[RTA_FLOW]); |
| uint32_t from = to>>16; |
| to &= 0xFFFF; |
| if (from) { |
| fprintf(fp, "realms %s/", |
| rtnl_rtrealm_n2a(from, b1, sizeof(b1))); |
| } |
| fprintf(fp, "%s ", |
| rtnl_rtrealm_n2a(to, b1, sizeof(b1))); |
| } |
| |
| if (r->rtm_type == RTN_NAT) { |
| if (tb[RTA_GATEWAY]) { |
| fprintf(fp, "map-to %s ", |
| format_host(r->rtm_family, |
| RTA_PAYLOAD(tb[RTA_GATEWAY]), |
| RTA_DATA(tb[RTA_GATEWAY]), |
| abuf, sizeof(abuf))); |
| } else |
| fprintf(fp, "masquerade"); |
| } else if (r->rtm_type != RTN_UNICAST) |
| fputs(rtnl_rtntype_n2a(r->rtm_type, b1, sizeof(b1)), fp); |
| |
| fputc('\n', fp); |
| fflush(fp); |
| return 0; |
| } |
| |
| /* Return value becomes exitcode. It's okay to not return at all */ |
| static int iprule_list(int argc, char **argv) |
| { |
| struct rtnl_handle rth; |
| int af = preferred_family; |
| |
| if (af == AF_UNSPEC) |
| af = AF_INET; |
| |
| if (argc > 0) { |
| //bb_error_msg("\"rule show\" needs no arguments"); |
| bb_warn_ignoring_args(argc); |
| return -1; |
| } |
| |
| xrtnl_open(&rth); |
| |
| xrtnl_wilddump_request(&rth, af, RTM_GETRULE); |
| xrtnl_dump_filter(&rth, print_rule, stdout); |
| |
| return 0; |
| } |
| |
| /* Return value becomes exitcode. It's okay to not return at all */ |
| static int iprule_modify(int cmd, int argc, char **argv) |
| { |
| static const char keywords[] ALIGN1 = |
| "from\0""to\0""preference\0""order\0""priority\0" |
| "tos\0""fwmark\0""realms\0""table\0""lookup\0""dev\0" |
| "iif\0""nat\0""map-to\0""type\0""help\0"; |
| enum { |
| ARG_from = 1, ARG_to, ARG_preference, ARG_order, ARG_priority, |
| ARG_tos, ARG_fwmark, ARG_realms, ARG_table, ARG_lookup, ARG_dev, |
| ARG_iif, ARG_nat, ARG_map_to, ARG_type, ARG_help |
| }; |
| bool table_ok = 0; |
| struct rtnl_handle rth; |
| struct { |
| struct nlmsghdr n; |
| struct rtmsg r; |
| char buf[1024]; |
| } req; |
| smalluint key; |
| |
| memset(&req, 0, sizeof(req)); |
| |
| req.n.nlmsg_type = cmd; |
| req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)); |
| req.n.nlmsg_flags = NLM_F_REQUEST; |
| req.r.rtm_family = preferred_family; |
| req.r.rtm_protocol = RTPROT_BOOT; |
| req.r.rtm_scope = RT_SCOPE_UNIVERSE; |
| req.r.rtm_table = 0; |
| req.r.rtm_type = RTN_UNSPEC; |
| |
| if (cmd == RTM_NEWRULE) { |
| req.n.nlmsg_flags |= NLM_F_CREATE|NLM_F_EXCL; |
| req.r.rtm_type = RTN_UNICAST; |
| } |
| |
| while (argc > 0) { |
| key = index_in_substrings(keywords, *argv) + 1; |
| if (key == 0) /* no match found in keywords array, bail out. */ |
| bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name); |
| if (key == ARG_from) { |
| inet_prefix dst; |
| NEXT_ARG(); |
| get_prefix(&dst, *argv, req.r.rtm_family); |
| req.r.rtm_src_len = dst.bitlen; |
| addattr_l(&req.n, sizeof(req), RTA_SRC, &dst.data, dst.bytelen); |
| } else if (key == ARG_to) { |
| inet_prefix dst; |
| NEXT_ARG(); |
| get_prefix(&dst, *argv, req.r.rtm_family); |
| req.r.rtm_dst_len = dst.bitlen; |
| addattr_l(&req.n, sizeof(req), RTA_DST, &dst.data, dst.bytelen); |
| } else if (key == ARG_preference || |
| key == ARG_order || |
| key == ARG_priority) { |
| uint32_t pref; |
| NEXT_ARG(); |
| if (get_u32(&pref, *argv, 0)) |
| invarg(*argv, "preference"); |
| addattr32(&req.n, sizeof(req), RTA_PRIORITY, pref); |
| } else if (key == ARG_tos) { |
| uint32_t tos; |
| NEXT_ARG(); |
| if (rtnl_dsfield_a2n(&tos, *argv)) |
| invarg(*argv, "TOS"); |
| req.r.rtm_tos = tos; |
| } else if (key == ARG_fwmark) { |
| uint32_t fwmark; |
| NEXT_ARG(); |
| if (get_u32(&fwmark, *argv, 0)) |
| invarg(*argv, "fwmark"); |
| addattr32(&req.n, sizeof(req), RTA_PROTOINFO, fwmark); |
| } else if (key == ARG_realms) { |
| uint32_t realm; |
| NEXT_ARG(); |
| if (get_rt_realms(&realm, *argv)) |
| invarg(*argv, "realms"); |
| addattr32(&req.n, sizeof(req), RTA_FLOW, realm); |
| } else if (key == ARG_table || |
| key == ARG_lookup) { |
| uint32_t tid; |
| NEXT_ARG(); |
| if (rtnl_rttable_a2n(&tid, *argv)) |
| invarg(*argv, "table ID"); |
| req.r.rtm_table = tid; |
| table_ok = 1; |
| } else if (key == ARG_dev || |
| key == ARG_iif) { |
| NEXT_ARG(); |
| addattr_l(&req.n, sizeof(req), RTA_IIF, *argv, strlen(*argv)+1); |
| } else if (key == ARG_nat || |
| key == ARG_map_to) { |
| NEXT_ARG(); |
| addattr32(&req.n, sizeof(req), RTA_GATEWAY, get_addr32(*argv)); |
| req.r.rtm_type = RTN_NAT; |
| } else { |
| int type; |
| |
| if (key == ARG_type) { |
| NEXT_ARG(); |
| } |
| if (key == ARG_help) |
| bb_show_usage(); |
| if (rtnl_rtntype_a2n(&type, *argv)) |
| invarg(*argv, "type"); |
| req.r.rtm_type = type; |
| } |
| argc--; |
| argv++; |
| } |
| |
| if (req.r.rtm_family == AF_UNSPEC) |
| req.r.rtm_family = AF_INET; |
| |
| if (!table_ok && cmd == RTM_NEWRULE) |
| req.r.rtm_table = RT_TABLE_MAIN; |
| |
| xrtnl_open(&rth); |
| |
| if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0) |
| return 2; |
| |
| return 0; |
| } |
| |
| /* Return value becomes exitcode. It's okay to not return at all */ |
| int do_iprule(int argc, char **argv) |
| { |
| static const char ip_rule_commands[] ALIGN1 = |
| "add\0""delete\0""list\0""show\0"; |
| int cmd = 2; /* list */ |
| |
| if (argc < 1) |
| return iprule_list(0, NULL); |
| if (*argv) |
| cmd = index_in_substrings(ip_rule_commands, *argv); |
| |
| switch (cmd) { |
| case 0: /* add */ |
| cmd = RTM_NEWRULE; |
| break; |
| case 1: /* delete */ |
| cmd = RTM_DELRULE; |
| break; |
| case 2: /* list */ |
| case 3: /* show */ |
| return iprule_list(argc-1, argv+1); |
| break; |
| default: |
| bb_error_msg_and_die("unknown command %s", *argv); |
| } |
| return iprule_modify(cmd, argc-1, argv+1); |
| } |