[3320] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * This program is free software; you can redistribute it and/or
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| 4 | * modify it under the terms of the GNU General Public License
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| 5 | * as published by the Free Software Foundation; either version
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| 6 | * 2 of the License, or (at your option) any later version.
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| 7 | *
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| 8 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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| 9 | *
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| 10 | * Changes:
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| 11 | *
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| 12 | * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
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| 13 | * initially integrated into busybox by Bernhard Reutner-Fischer
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| 14 | */
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| 15 |
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| 16 | #include <netinet/in.h>
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| 17 | #include <netinet/ip.h>
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| 18 | #include <arpa/inet.h>
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| 19 |
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| 20 | #include "ip_common.h" /* #include "libbb.h" is inside */
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| 21 | #include "rt_names.h"
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| 22 | #include "utils.h"
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| 23 |
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| 24 | /*
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| 25 | static void usage(void) __attribute__((noreturn));
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| 26 |
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| 27 | static void usage(void)
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| 28 | {
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| 29 | fprintf(stderr, "Usage: ip rule [ list | add | del ] SELECTOR ACTION\n");
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| 30 | fprintf(stderr, "SELECTOR := [ from PREFIX ] [ to PREFIX ] [ tos TOS ] [ fwmark FWMARK ]\n");
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| 31 | fprintf(stderr, " [ dev STRING ] [ pref NUMBER ]\n");
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| 32 | fprintf(stderr, "ACTION := [ table TABLE_ID ] [ nat ADDRESS ]\n");
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| 33 | fprintf(stderr, " [ prohibit | reject | unreachable ]\n");
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| 34 | fprintf(stderr, " [ realms [SRCREALM/]DSTREALM ]\n");
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| 35 | fprintf(stderr, "TABLE_ID := [ local | main | default | NUMBER ]\n");
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| 36 | exit(-1);
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| 37 | }
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| 38 | */
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| 39 |
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| 40 | static int FAST_FUNC print_rule(const struct sockaddr_nl *who UNUSED_PARAM,
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| 41 | struct nlmsghdr *n, void *arg UNUSED_PARAM)
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| 42 | {
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| 43 | struct rtmsg *r = NLMSG_DATA(n);
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| 44 | int len = n->nlmsg_len;
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| 45 | int host_len = -1;
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| 46 | struct rtattr * tb[RTA_MAX+1];
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| 47 | char abuf[256];
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| 48 | SPRINT_BUF(b1);
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| 49 |
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| 50 | if (n->nlmsg_type != RTM_NEWRULE)
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| 51 | return 0;
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| 52 |
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| 53 | len -= NLMSG_LENGTH(sizeof(*r));
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| 54 | if (len < 0)
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| 55 | return -1;
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| 56 |
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| 57 | memset(tb, 0, sizeof(tb));
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| 58 | parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
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| 59 |
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| 60 | if (r->rtm_family == AF_INET)
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| 61 | host_len = 32;
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| 62 | else if (r->rtm_family == AF_INET6)
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| 63 | host_len = 128;
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| 64 | /* else if (r->rtm_family == AF_DECnet)
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| 65 | host_len = 16;
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| 66 | else if (r->rtm_family == AF_IPX)
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| 67 | host_len = 80;
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| 68 | */
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| 69 | printf("%u:\t", tb[RTA_PRIORITY] ?
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| 70 | *(unsigned*)RTA_DATA(tb[RTA_PRIORITY])
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| 71 | : 0);
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| 72 | printf("from ");
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| 73 | if (tb[RTA_SRC]) {
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| 74 | if (r->rtm_src_len != host_len) {
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| 75 | printf("%s/%u", rt_addr_n2a(r->rtm_family,
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| 76 | RTA_DATA(tb[RTA_SRC]),
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| 77 | abuf, sizeof(abuf)),
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| 78 | r->rtm_src_len
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| 79 | );
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| 80 | } else {
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| 81 | fputs(format_host(r->rtm_family,
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| 82 | RTA_PAYLOAD(tb[RTA_SRC]),
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| 83 | RTA_DATA(tb[RTA_SRC]),
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| 84 | abuf, sizeof(abuf)), stdout);
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| 85 | }
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| 86 | } else if (r->rtm_src_len) {
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| 87 | printf("0/%d", r->rtm_src_len);
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| 88 | } else {
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| 89 | printf("all");
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| 90 | }
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| 91 | bb_putchar(' ');
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| 92 |
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| 93 | if (tb[RTA_DST]) {
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| 94 | if (r->rtm_dst_len != host_len) {
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| 95 | printf("to %s/%u ", rt_addr_n2a(r->rtm_family,
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| 96 | RTA_DATA(tb[RTA_DST]),
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| 97 | abuf, sizeof(abuf)),
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| 98 | r->rtm_dst_len
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| 99 | );
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| 100 | } else {
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| 101 | printf("to %s ", format_host(r->rtm_family,
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| 102 | RTA_PAYLOAD(tb[RTA_DST]),
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| 103 | RTA_DATA(tb[RTA_DST]),
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| 104 | abuf, sizeof(abuf)));
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| 105 | }
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| 106 | } else if (r->rtm_dst_len) {
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| 107 | printf("to 0/%d ", r->rtm_dst_len);
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| 108 | }
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| 109 |
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| 110 | if (r->rtm_tos) {
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| 111 | printf("tos %s ", rtnl_dsfield_n2a(r->rtm_tos, b1));
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| 112 | }
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| 113 | if (tb[RTA_PROTOINFO]) {
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| 114 | printf("fwmark %#x ", *(uint32_t*)RTA_DATA(tb[RTA_PROTOINFO]));
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| 115 | }
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| 116 |
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| 117 | if (tb[RTA_IIF]) {
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| 118 | printf("iif %s ", (char*)RTA_DATA(tb[RTA_IIF]));
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| 119 | }
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| 120 |
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| 121 | if (r->rtm_table)
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| 122 | printf("lookup %s ", rtnl_rttable_n2a(r->rtm_table, b1));
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| 123 |
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| 124 | if (tb[RTA_FLOW]) {
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| 125 | uint32_t to = *(uint32_t*)RTA_DATA(tb[RTA_FLOW]);
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| 126 | uint32_t from = to>>16;
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| 127 | to &= 0xFFFF;
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| 128 | if (from) {
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| 129 | printf("realms %s/",
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| 130 | rtnl_rtrealm_n2a(from, b1));
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| 131 | }
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| 132 | printf("%s ",
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| 133 | rtnl_rtrealm_n2a(to, b1));
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| 134 | }
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| 135 |
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| 136 | if (r->rtm_type == RTN_NAT) {
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| 137 | if (tb[RTA_GATEWAY]) {
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| 138 | printf("map-to %s ",
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| 139 | format_host(r->rtm_family,
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| 140 | RTA_PAYLOAD(tb[RTA_GATEWAY]),
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| 141 | RTA_DATA(tb[RTA_GATEWAY]),
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| 142 | abuf, sizeof(abuf)));
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| 143 | } else
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| 144 | printf("masquerade");
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| 145 | } else if (r->rtm_type != RTN_UNICAST)
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| 146 | fputs(rtnl_rtntype_n2a(r->rtm_type, b1), stdout);
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| 147 |
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| 148 | bb_putchar('\n');
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| 149 | /*fflush_all();*/
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| 150 | return 0;
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| 151 | }
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| 152 |
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| 153 | /* Return value becomes exitcode. It's okay to not return at all */
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| 154 | static int iprule_list(char **argv)
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| 155 | {
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| 156 | struct rtnl_handle rth;
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| 157 | int af = preferred_family;
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| 158 |
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| 159 | if (af == AF_UNSPEC)
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| 160 | af = AF_INET;
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| 161 |
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| 162 | if (*argv) {
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| 163 | //bb_error_msg("\"rule show\" needs no arguments");
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| 164 | bb_warn_ignoring_args(*argv);
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| 165 | return -1;
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| 166 | }
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| 167 |
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| 168 | xrtnl_open(&rth);
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| 169 |
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| 170 | xrtnl_wilddump_request(&rth, af, RTM_GETRULE);
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| 171 | xrtnl_dump_filter(&rth, print_rule, NULL);
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| 172 |
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| 173 | return 0;
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| 174 | }
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| 175 |
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| 176 | /* Return value becomes exitcode. It's okay to not return at all */
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| 177 | static int iprule_modify(int cmd, char **argv)
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| 178 | {
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| 179 | static const char keywords[] ALIGN1 =
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| 180 | "from\0""to\0""preference\0""order\0""priority\0"
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| 181 | "tos\0""fwmark\0""realms\0""table\0""lookup\0""dev\0"
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| 182 | "iif\0""nat\0""map-to\0""type\0""help\0";
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| 183 | enum {
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| 184 | ARG_from = 1, ARG_to, ARG_preference, ARG_order, ARG_priority,
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| 185 | ARG_tos, ARG_fwmark, ARG_realms, ARG_table, ARG_lookup, ARG_dev,
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| 186 | ARG_iif, ARG_nat, ARG_map_to, ARG_type, ARG_help
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| 187 | };
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| 188 | bool table_ok = 0;
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| 189 | struct rtnl_handle rth;
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| 190 | struct {
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| 191 | struct nlmsghdr n;
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| 192 | struct rtmsg r;
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| 193 | char buf[1024];
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| 194 | } req;
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| 195 | smalluint key;
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| 196 |
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| 197 | memset(&req, 0, sizeof(req));
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| 198 |
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| 199 | req.n.nlmsg_type = cmd;
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| 200 | req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
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| 201 | req.n.nlmsg_flags = NLM_F_REQUEST;
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| 202 | req.r.rtm_family = preferred_family;
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| 203 | req.r.rtm_protocol = RTPROT_BOOT;
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| 204 | req.r.rtm_scope = RT_SCOPE_UNIVERSE;
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| 205 | req.r.rtm_table = 0;
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| 206 | req.r.rtm_type = RTN_UNSPEC;
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| 207 |
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| 208 | if (cmd == RTM_NEWRULE) {
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| 209 | req.n.nlmsg_flags |= NLM_F_CREATE|NLM_F_EXCL;
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| 210 | req.r.rtm_type = RTN_UNICAST;
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| 211 | }
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| 212 |
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| 213 | while (*argv) {
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| 214 | key = index_in_substrings(keywords, *argv) + 1;
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| 215 | if (key == 0) /* no match found in keywords array, bail out. */
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| 216 | bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name);
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| 217 | if (key == ARG_from) {
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| 218 | inet_prefix dst;
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| 219 | NEXT_ARG();
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| 220 | get_prefix(&dst, *argv, req.r.rtm_family);
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| 221 | req.r.rtm_src_len = dst.bitlen;
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| 222 | addattr_l(&req.n, sizeof(req), RTA_SRC, &dst.data, dst.bytelen);
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| 223 | } else if (key == ARG_to) {
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| 224 | inet_prefix dst;
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| 225 | NEXT_ARG();
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| 226 | get_prefix(&dst, *argv, req.r.rtm_family);
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| 227 | req.r.rtm_dst_len = dst.bitlen;
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| 228 | addattr_l(&req.n, sizeof(req), RTA_DST, &dst.data, dst.bytelen);
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| 229 | } else if (key == ARG_preference ||
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| 230 | key == ARG_order ||
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| 231 | key == ARG_priority
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| 232 | ) {
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| 233 | uint32_t pref;
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| 234 | NEXT_ARG();
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| 235 | pref = get_u32(*argv, "preference");
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| 236 | addattr32(&req.n, sizeof(req), RTA_PRIORITY, pref);
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| 237 | } else if (key == ARG_tos) {
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| 238 | uint32_t tos;
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| 239 | NEXT_ARG();
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| 240 | if (rtnl_dsfield_a2n(&tos, *argv))
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| 241 | invarg(*argv, "TOS");
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| 242 | req.r.rtm_tos = tos;
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| 243 | } else if (key == ARG_fwmark) {
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| 244 | uint32_t fwmark;
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| 245 | NEXT_ARG();
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| 246 | fwmark = get_u32(*argv, "fwmark");
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| 247 | addattr32(&req.n, sizeof(req), RTA_PROTOINFO, fwmark);
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| 248 | } else if (key == ARG_realms) {
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| 249 | uint32_t realm;
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| 250 | NEXT_ARG();
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| 251 | if (get_rt_realms(&realm, *argv))
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| 252 | invarg(*argv, "realms");
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| 253 | addattr32(&req.n, sizeof(req), RTA_FLOW, realm);
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| 254 | } else if (key == ARG_table ||
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| 255 | key == ARG_lookup
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| 256 | ) {
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| 257 | uint32_t tid;
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| 258 | NEXT_ARG();
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| 259 | if (rtnl_rttable_a2n(&tid, *argv))
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| 260 | invarg(*argv, "table ID");
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| 261 | req.r.rtm_table = tid;
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| 262 | table_ok = 1;
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| 263 | } else if (key == ARG_dev ||
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| 264 | key == ARG_iif
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| 265 | ) {
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| 266 | NEXT_ARG();
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| 267 | addattr_l(&req.n, sizeof(req), RTA_IIF, *argv, strlen(*argv)+1);
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| 268 | } else if (key == ARG_nat ||
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| 269 | key == ARG_map_to
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| 270 | ) {
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| 271 | NEXT_ARG();
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| 272 | addattr32(&req.n, sizeof(req), RTA_GATEWAY, get_addr32(*argv));
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| 273 | req.r.rtm_type = RTN_NAT;
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| 274 | } else {
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| 275 | int type;
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| 276 |
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| 277 | if (key == ARG_type) {
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| 278 | NEXT_ARG();
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| 279 | }
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| 280 | if (key == ARG_help)
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| 281 | bb_show_usage();
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| 282 | if (rtnl_rtntype_a2n(&type, *argv))
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| 283 | invarg(*argv, "type");
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| 284 | req.r.rtm_type = type;
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| 285 | }
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| 286 | argv++;
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| 287 | }
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| 288 |
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| 289 | if (req.r.rtm_family == AF_UNSPEC)
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| 290 | req.r.rtm_family = AF_INET;
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| 291 |
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| 292 | if (!table_ok && cmd == RTM_NEWRULE)
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| 293 | req.r.rtm_table = RT_TABLE_MAIN;
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| 294 |
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| 295 | xrtnl_open(&rth);
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| 296 |
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| 297 | if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
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| 298 | return 2;
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| 299 |
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| 300 | return 0;
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| 301 | }
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| 302 |
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| 303 | /* Return value becomes exitcode. It's okay to not return at all */
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| 304 | int FAST_FUNC do_iprule(char **argv)
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| 305 | {
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| 306 | static const char ip_rule_commands[] ALIGN1 =
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| 307 | "add\0""delete\0""list\0""show\0";
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| 308 | if (*argv) {
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| 309 | smalluint cmd = index_in_substrings(ip_rule_commands, *argv);
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| 310 | if (cmd > 3)
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| 311 | bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name);
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| 312 | argv++;
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| 313 | if (cmd < 2)
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| 314 | return iprule_modify((cmd == 0) ? RTM_NEWRULE : RTM_DELRULE, argv);
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| 315 | }
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| 316 | return iprule_list(argv);
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| 317 | }
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