[1765] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * iprule.c "ip rule".
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| 4 | *
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| 5 | * This program is free software; you can redistribute it and/or
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| 6 | * modify it under the terms of the GNU General Public License
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| 7 | * as published by the Free Software Foundation; either version
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| 8 | * 2 of the License, or (at your option) any later version.
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| 9 | *
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| 10 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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| 11 | *
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| 12 | *
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| 13 | * Changes:
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| 14 | *
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| 15 | * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
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| 16 | * initially integrated into busybox by Bernhard Fischer
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| 17 | */
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| 18 |
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| 19 | #include <syslog.h>
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| 20 | //#include <sys/socket.h>
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| 21 | #include <netinet/in.h>
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| 22 | #include <netinet/ip.h>
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| 23 | #include <arpa/inet.h>
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| 24 |
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| 25 | #include "ip_common.h" /* #include "libbb.h" is inside */
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| 26 | #include "rt_names.h"
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| 27 | #include "utils.h"
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| 28 |
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| 29 | /*
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| 30 | static void usage(void) __attribute__((noreturn));
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| 31 |
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| 32 | static void usage(void)
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| 33 | {
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| 34 | fprintf(stderr, "Usage: ip rule [ list | add | del ] SELECTOR ACTION\n");
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| 35 | fprintf(stderr, "SELECTOR := [ from PREFIX ] [ to PREFIX ] [ tos TOS ] [ fwmark FWMARK ]\n");
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| 36 | fprintf(stderr, " [ dev STRING ] [ pref NUMBER ]\n");
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| 37 | fprintf(stderr, "ACTION := [ table TABLE_ID ] [ nat ADDRESS ]\n");
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| 38 | fprintf(stderr, " [ prohibit | reject | unreachable ]\n");
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| 39 | fprintf(stderr, " [ realms [SRCREALM/]DSTREALM ]\n");
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| 40 | fprintf(stderr, "TABLE_ID := [ local | main | default | NUMBER ]\n");
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| 41 | exit(-1);
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| 42 | }
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| 43 | */
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| 44 |
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| 45 | static int print_rule(struct sockaddr_nl *who ATTRIBUTE_UNUSED,
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| 46 | struct nlmsghdr *n, void *arg)
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| 47 | {
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| 48 | FILE *fp = (FILE*)arg;
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| 49 | struct rtmsg *r = NLMSG_DATA(n);
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| 50 | int len = n->nlmsg_len;
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| 51 | int host_len = -1;
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| 52 | struct rtattr * tb[RTA_MAX+1];
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| 53 | char abuf[256];
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| 54 | SPRINT_BUF(b1);
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| 55 |
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| 56 | if (n->nlmsg_type != RTM_NEWRULE)
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| 57 | return 0;
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| 58 |
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| 59 | len -= NLMSG_LENGTH(sizeof(*r));
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| 60 | if (len < 0)
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| 61 | return -1;
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| 62 |
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| 63 | memset(tb, 0, sizeof(tb));
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| 64 | parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
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| 65 |
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| 66 | if (r->rtm_family == AF_INET)
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| 67 | host_len = 32;
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| 68 | else if (r->rtm_family == AF_INET6)
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| 69 | host_len = 128;
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| 70 | /* else if (r->rtm_family == AF_DECnet)
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| 71 | host_len = 16;
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| 72 | else if (r->rtm_family == AF_IPX)
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| 73 | host_len = 80;
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| 74 | */
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| 75 | if (tb[RTA_PRIORITY])
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| 76 | fprintf(fp, "%u:\t", *(unsigned*)RTA_DATA(tb[RTA_PRIORITY]));
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| 77 | else
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| 78 | fprintf(fp, "0:\t");
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| 79 |
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| 80 | fprintf(fp, "from ");
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| 81 | if (tb[RTA_SRC]) {
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| 82 | if (r->rtm_src_len != host_len) {
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| 83 | fprintf(fp, "%s/%u", rt_addr_n2a(r->rtm_family,
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| 84 | RTA_PAYLOAD(tb[RTA_SRC]),
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| 85 | RTA_DATA(tb[RTA_SRC]),
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| 86 | abuf, sizeof(abuf)),
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| 87 | r->rtm_src_len
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| 88 | );
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| 89 | } else {
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| 90 | fprintf(fp, "%s", format_host(r->rtm_family,
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| 91 | RTA_PAYLOAD(tb[RTA_SRC]),
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| 92 | RTA_DATA(tb[RTA_SRC]),
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| 93 | abuf, sizeof(abuf))
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| 94 | );
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| 95 | }
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| 96 | } else if (r->rtm_src_len) {
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| 97 | fprintf(fp, "0/%d", r->rtm_src_len);
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| 98 | } else {
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| 99 | fprintf(fp, "all");
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| 100 | }
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| 101 | fprintf(fp, " ");
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| 102 |
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| 103 | if (tb[RTA_DST]) {
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| 104 | if (r->rtm_dst_len != host_len) {
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| 105 | fprintf(fp, "to %s/%u ", rt_addr_n2a(r->rtm_family,
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| 106 | RTA_PAYLOAD(tb[RTA_DST]),
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| 107 | RTA_DATA(tb[RTA_DST]),
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| 108 | abuf, sizeof(abuf)),
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| 109 | r->rtm_dst_len
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| 110 | );
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| 111 | } else {
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| 112 | fprintf(fp, "to %s ", format_host(r->rtm_family,
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| 113 | RTA_PAYLOAD(tb[RTA_DST]),
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| 114 | RTA_DATA(tb[RTA_DST]),
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| 115 | abuf, sizeof(abuf)));
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| 116 | }
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| 117 | } else if (r->rtm_dst_len) {
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| 118 | fprintf(fp, "to 0/%d ", r->rtm_dst_len);
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| 119 | }
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| 120 |
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| 121 | if (r->rtm_tos) {
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| 122 | fprintf(fp, "tos %s ", rtnl_dsfield_n2a(r->rtm_tos, b1, sizeof(b1)));
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| 123 | }
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| 124 | if (tb[RTA_PROTOINFO]) {
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| 125 | fprintf(fp, "fwmark %#x ", *(uint32_t*)RTA_DATA(tb[RTA_PROTOINFO]));
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| 126 | }
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| 127 |
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| 128 | if (tb[RTA_IIF]) {
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| 129 | fprintf(fp, "iif %s ", (char*)RTA_DATA(tb[RTA_IIF]));
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| 130 | }
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| 131 |
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| 132 | if (r->rtm_table)
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| 133 | fprintf(fp, "lookup %s ", rtnl_rttable_n2a(r->rtm_table, b1, sizeof(b1)));
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| 134 |
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| 135 | if (tb[RTA_FLOW]) {
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| 136 | uint32_t to = *(uint32_t*)RTA_DATA(tb[RTA_FLOW]);
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| 137 | uint32_t from = to>>16;
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| 138 | to &= 0xFFFF;
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| 139 | if (from) {
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| 140 | fprintf(fp, "realms %s/",
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| 141 | rtnl_rtrealm_n2a(from, b1, sizeof(b1)));
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| 142 | }
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| 143 | fprintf(fp, "%s ",
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| 144 | rtnl_rtrealm_n2a(to, b1, sizeof(b1)));
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| 145 | }
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| 146 |
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| 147 | if (r->rtm_type == RTN_NAT) {
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| 148 | if (tb[RTA_GATEWAY]) {
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| 149 | fprintf(fp, "map-to %s ",
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| 150 | format_host(r->rtm_family,
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| 151 | RTA_PAYLOAD(tb[RTA_GATEWAY]),
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| 152 | RTA_DATA(tb[RTA_GATEWAY]),
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| 153 | abuf, sizeof(abuf)));
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| 154 | } else
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| 155 | fprintf(fp, "masquerade");
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| 156 | } else if (r->rtm_type != RTN_UNICAST)
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| 157 | fprintf(fp, "%s", rtnl_rtntype_n2a(r->rtm_type, b1, sizeof(b1)));
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| 158 |
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| 159 | fputc('\n', fp);
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| 160 | fflush(fp);
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| 161 | return 0;
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| 162 | }
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| 163 |
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| 164 | /* Return value becomes exitcode. It's okay to not return at all */
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| 165 | static int iprule_list(int argc, char **argv)
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| 166 | {
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| 167 | struct rtnl_handle rth;
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| 168 | int af = preferred_family;
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| 169 |
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| 170 | if (af == AF_UNSPEC)
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| 171 | af = AF_INET;
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| 172 |
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| 173 | if (argc > 0) {
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| 174 | //bb_error_msg("\"rule show\" needs no arguments");
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| 175 | bb_warn_ignoring_args(argc);
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| 176 | return -1;
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| 177 | }
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| 178 |
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| 179 | xrtnl_open(&rth);
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| 180 |
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| 181 | xrtnl_wilddump_request(&rth, af, RTM_GETRULE);
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| 182 | xrtnl_dump_filter(&rth, print_rule, stdout);
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| 183 |
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| 184 | return 0;
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| 185 | }
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| 186 |
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| 187 | /* Return value becomes exitcode. It's okay to not return at all */
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| 188 | static int iprule_modify(int cmd, int argc, char **argv)
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| 189 | {
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| 190 | static const char keywords[] ALIGN1 =
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| 191 | "from\0""to\0""preference\0""order\0""priority\0"
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| 192 | "tos\0""fwmark\0""realms\0""table\0""lookup\0""dev\0"
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| 193 | "iif\0""nat\0""map-to\0""type\0""help\0";
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| 194 | enum {
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| 195 | ARG_from = 1, ARG_to, ARG_preference, ARG_order, ARG_priority,
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| 196 | ARG_tos, ARG_fwmark, ARG_realms, ARG_table, ARG_lookup, ARG_dev,
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| 197 | ARG_iif, ARG_nat, ARG_map_to, ARG_type, ARG_help
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| 198 | };
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| 199 | bool table_ok = 0;
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| 200 | struct rtnl_handle rth;
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| 201 | struct {
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| 202 | struct nlmsghdr n;
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| 203 | struct rtmsg r;
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| 204 | char buf[1024];
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| 205 | } req;
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| 206 | smalluint key;
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| 207 |
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| 208 | memset(&req, 0, sizeof(req));
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| 209 |
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| 210 | req.n.nlmsg_type = cmd;
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| 211 | req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
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| 212 | req.n.nlmsg_flags = NLM_F_REQUEST;
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| 213 | req.r.rtm_family = preferred_family;
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| 214 | req.r.rtm_protocol = RTPROT_BOOT;
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| 215 | req.r.rtm_scope = RT_SCOPE_UNIVERSE;
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| 216 | req.r.rtm_table = 0;
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| 217 | req.r.rtm_type = RTN_UNSPEC;
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| 218 |
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| 219 | if (cmd == RTM_NEWRULE) {
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| 220 | req.n.nlmsg_flags |= NLM_F_CREATE|NLM_F_EXCL;
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| 221 | req.r.rtm_type = RTN_UNICAST;
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| 222 | }
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| 223 |
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| 224 | while (argc > 0) {
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| 225 | key = index_in_substrings(keywords, *argv) + 1;
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| 226 | if (key == 0) /* no match found in keywords array, bail out. */
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| 227 | bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name);
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| 228 | if (key == ARG_from) {
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| 229 | inet_prefix dst;
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| 230 | NEXT_ARG();
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| 231 | get_prefix(&dst, *argv, req.r.rtm_family);
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| 232 | req.r.rtm_src_len = dst.bitlen;
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| 233 | addattr_l(&req.n, sizeof(req), RTA_SRC, &dst.data, dst.bytelen);
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| 234 | } else if (key == ARG_to) {
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| 235 | inet_prefix dst;
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| 236 | NEXT_ARG();
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| 237 | get_prefix(&dst, *argv, req.r.rtm_family);
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| 238 | req.r.rtm_dst_len = dst.bitlen;
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| 239 | addattr_l(&req.n, sizeof(req), RTA_DST, &dst.data, dst.bytelen);
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| 240 | } else if (key == ARG_preference ||
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| 241 | key == ARG_order ||
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| 242 | key == ARG_priority) {
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| 243 | uint32_t pref;
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| 244 | NEXT_ARG();
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| 245 | if (get_u32(&pref, *argv, 0))
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| 246 | invarg(*argv, "preference");
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| 247 | addattr32(&req.n, sizeof(req), RTA_PRIORITY, pref);
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| 248 | } else if (key == ARG_tos) {
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| 249 | uint32_t tos;
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| 250 | NEXT_ARG();
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| 251 | if (rtnl_dsfield_a2n(&tos, *argv))
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| 252 | invarg(*argv, "TOS");
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| 253 | req.r.rtm_tos = tos;
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| 254 | } else if (key == ARG_fwmark) {
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| 255 | uint32_t fwmark;
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| 256 | NEXT_ARG();
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| 257 | if (get_u32(&fwmark, *argv, 0))
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| 258 | invarg(*argv, "fwmark");
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| 259 | addattr32(&req.n, sizeof(req), RTA_PROTOINFO, fwmark);
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| 260 | } else if (key == ARG_realms) {
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| 261 | uint32_t realm;
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| 262 | NEXT_ARG();
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| 263 | if (get_rt_realms(&realm, *argv))
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| 264 | invarg(*argv, "realms");
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| 265 | addattr32(&req.n, sizeof(req), RTA_FLOW, realm);
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| 266 | } else if (key == ARG_table ||
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| 267 | key == ARG_lookup) {
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| 268 | uint32_t tid;
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| 269 | NEXT_ARG();
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| 270 | if (rtnl_rttable_a2n(&tid, *argv))
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| 271 | invarg(*argv, "table ID");
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| 272 | req.r.rtm_table = tid;
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| 273 | table_ok = 1;
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| 274 | } else if (key == ARG_dev ||
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| 275 | key == ARG_iif) {
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| 276 | NEXT_ARG();
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| 277 | addattr_l(&req.n, sizeof(req), RTA_IIF, *argv, strlen(*argv)+1);
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| 278 | } else if (key == ARG_nat ||
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| 279 | key == ARG_map_to) {
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| 280 | NEXT_ARG();
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| 281 | addattr32(&req.n, sizeof(req), RTA_GATEWAY, get_addr32(*argv));
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| 282 | req.r.rtm_type = RTN_NAT;
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| 283 | } else {
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| 284 | int type;
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| 285 |
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| 286 | if (key == ARG_type) {
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| 287 | NEXT_ARG();
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| 288 | }
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| 289 | if (key == ARG_help)
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| 290 | bb_show_usage();
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| 291 | if (rtnl_rtntype_a2n(&type, *argv))
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| 292 | invarg(*argv, "type");
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| 293 | req.r.rtm_type = type;
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| 294 | }
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| 295 | argc--;
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| 296 | argv++;
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| 297 | }
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| 298 |
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| 299 | if (req.r.rtm_family == AF_UNSPEC)
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| 300 | req.r.rtm_family = AF_INET;
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| 301 |
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| 302 | if (!table_ok && cmd == RTM_NEWRULE)
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| 303 | req.r.rtm_table = RT_TABLE_MAIN;
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| 304 |
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| 305 | xrtnl_open(&rth);
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| 306 |
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| 307 | if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
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| 308 | return 2;
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| 309 |
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| 310 | return 0;
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| 311 | }
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| 312 |
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| 313 | /* Return value becomes exitcode. It's okay to not return at all */
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| 314 | int do_iprule(int argc, char **argv)
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| 315 | {
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| 316 | static const char ip_rule_commands[] ALIGN1 =
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| 317 | "add\0""delete\0""list\0""show\0";
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| 318 | int cmd = 2; /* list */
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| 319 |
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| 320 | if (argc < 1)
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| 321 | return iprule_list(0, NULL);
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| 322 | if (*argv)
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| 323 | cmd = index_in_substrings(ip_rule_commands, *argv);
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| 324 |
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| 325 | switch (cmd) {
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| 326 | case 0: /* add */
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| 327 | cmd = RTM_NEWRULE;
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| 328 | break;
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| 329 | case 1: /* delete */
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| 330 | cmd = RTM_DELRULE;
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| 331 | break;
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| 332 | case 2: /* list */
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| 333 | case 3: /* show */
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| 334 | return iprule_list(argc-1, argv+1);
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| 335 | break;
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| 336 | default:
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| 337 | bb_error_msg_and_die("unknown command %s", *argv);
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| 338 | }
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| 339 | return iprule_modify(cmd, argc-1, argv+1);
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| 340 | }
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