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    Contents of /trunk/mkinitrd-magellan/busybox/networking/libiproute/iprule.c

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    Revision 984 - (show annotations) (download)
    Sun May 30 11:32:42 2010 UTC (13 years, 11 months ago) by niro
    File MIME type: text/plain
    File size: 8419 byte(s) 
    -updated to busybox-1.16.1 and enabled blkid/uuid support in default config
    1 /* vi: set sw=4 ts=4: */
    2 /*
    3 * iprule.c "ip rule".
    4 *
    5 * This program is free software; you can redistribute it and/or
    6 * modify it under the terms of the GNU General Public License
    7 * as published by the Free Software Foundation; either version
    8 * 2 of the License, or (at your option) any later version.
    9 *
    10 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
    11 *
    12 *
    13 * Changes:
    14 *
    15 * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
    16 * initially integrated into busybox by Bernhard Reutner-Fischer
    17 */
    18
    19 #include <netinet/in.h>
    20 #include <netinet/ip.h>
    21 #include <arpa/inet.h>
    22
    23 #include "ip_common.h" /* #include "libbb.h" is inside */
    24 #include "rt_names.h"
    25 #include "utils.h"
    26
    27 /*
    28 static void usage(void) __attribute__((noreturn));
    29
    30 static void usage(void)
    31 {
    32 fprintf(stderr, "Usage: ip rule [ list | add | del ] SELECTOR ACTION\n");
    33 fprintf(stderr, "SELECTOR := [ from PREFIX ] [ to PREFIX ] [ tos TOS ] [ fwmark FWMARK ]\n");
    34 fprintf(stderr, " [ dev STRING ] [ pref NUMBER ]\n");
    35 fprintf(stderr, "ACTION := [ table TABLE_ID ] [ nat ADDRESS ]\n");
    36 fprintf(stderr, " [ prohibit | reject | unreachable ]\n");
    37 fprintf(stderr, " [ realms [SRCREALM/]DSTREALM ]\n");
    38 fprintf(stderr, "TABLE_ID := [ local | main | default | NUMBER ]\n");
    39 exit(-1);
    40 }
    41 */
    42
    43 static int FAST_FUNC print_rule(const struct sockaddr_nl *who UNUSED_PARAM,
    44 struct nlmsghdr *n, void *arg UNUSED_PARAM)
    45 {
    46 struct rtmsg *r = NLMSG_DATA(n);
    47 int len = n->nlmsg_len;
    48 int host_len = -1;
    49 struct rtattr * tb[RTA_MAX+1];
    50 char abuf[256];
    51 SPRINT_BUF(b1);
    52
    53 if (n->nlmsg_type != RTM_NEWRULE)
    54 return 0;
    55
    56 len -= NLMSG_LENGTH(sizeof(*r));
    57 if (len < 0)
    58 return -1;
    59
    60 memset(tb, 0, sizeof(tb));
    61 parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
    62
    63 if (r->rtm_family == AF_INET)
    64 host_len = 32;
    65 else if (r->rtm_family == AF_INET6)
    66 host_len = 128;
    67 /* else if (r->rtm_family == AF_DECnet)
    68 host_len = 16;
    69 else if (r->rtm_family == AF_IPX)
    70 host_len = 80;
    71 */
    72 if (tb[RTA_PRIORITY])
    73 printf("%u:\t", *(unsigned*)RTA_DATA(tb[RTA_PRIORITY]));
    74 else
    75 printf("0:\t");
    76
    77 printf("from ");
    78 if (tb[RTA_SRC]) {
    79 if (r->rtm_src_len != host_len) {
    80 printf("%s/%u", rt_addr_n2a(r->rtm_family,
    81 RTA_DATA(tb[RTA_SRC]),
    82 abuf, sizeof(abuf)),
    83 r->rtm_src_len
    84 );
    85 } else {
    86 fputs(format_host(r->rtm_family,
    87 RTA_PAYLOAD(tb[RTA_SRC]),
    88 RTA_DATA(tb[RTA_SRC]),
    89 abuf, sizeof(abuf)), stdout);
    90 }
    91 } else if (r->rtm_src_len) {
    92 printf("0/%d", r->rtm_src_len);
    93 } else {
    94 printf("all");
    95 }
    96 bb_putchar(' ');
    97
    98 if (tb[RTA_DST]) {
    99 if (r->rtm_dst_len != host_len) {
    100 printf("to %s/%u ", rt_addr_n2a(r->rtm_family,
    101 RTA_DATA(tb[RTA_DST]),
    102 abuf, sizeof(abuf)),
    103 r->rtm_dst_len
    104 );
    105 } else {
    106 printf("to %s ", format_host(r->rtm_family,
    107 RTA_PAYLOAD(tb[RTA_DST]),
    108 RTA_DATA(tb[RTA_DST]),
    109 abuf, sizeof(abuf)));
    110 }
    111 } else if (r->rtm_dst_len) {
    112 printf("to 0/%d ", r->rtm_dst_len);
    113 }
    114
    115 if (r->rtm_tos) {
    116 printf("tos %s ", rtnl_dsfield_n2a(r->rtm_tos, b1));
    117 }
    118 if (tb[RTA_PROTOINFO]) {
    119 printf("fwmark %#x ", *(uint32_t*)RTA_DATA(tb[RTA_PROTOINFO]));
    120 }
    121
    122 if (tb[RTA_IIF]) {
    123 printf("iif %s ", (char*)RTA_DATA(tb[RTA_IIF]));
    124 }
    125
    126 if (r->rtm_table)
    127 printf("lookup %s ", rtnl_rttable_n2a(r->rtm_table, b1));
    128
    129 if (tb[RTA_FLOW]) {
    130 uint32_t to = *(uint32_t*)RTA_DATA(tb[RTA_FLOW]);
    131 uint32_t from = to>>16;
    132 to &= 0xFFFF;
    133 if (from) {
    134 printf("realms %s/",
    135 rtnl_rtrealm_n2a(from, b1));
    136 }
    137 printf("%s ",
    138 rtnl_rtrealm_n2a(to, b1));
    139 }
    140
    141 if (r->rtm_type == RTN_NAT) {
    142 if (tb[RTA_GATEWAY]) {
    143 printf("map-to %s ",
    144 format_host(r->rtm_family,
    145 RTA_PAYLOAD(tb[RTA_GATEWAY]),
    146 RTA_DATA(tb[RTA_GATEWAY]),
    147 abuf, sizeof(abuf)));
    148 } else
    149 printf("masquerade");
    150 } else if (r->rtm_type != RTN_UNICAST)
    151 fputs(rtnl_rtntype_n2a(r->rtm_type, b1), stdout);
    152
    153 bb_putchar('\n');
    154 /*fflush_all();*/
    155 return 0;
    156 }
    157
    158 /* Return value becomes exitcode. It's okay to not return at all */
    159 static int iprule_list(char **argv)
    160 {
    161 struct rtnl_handle rth;
    162 int af = preferred_family;
    163
    164 if (af == AF_UNSPEC)
    165 af = AF_INET;
    166
    167 if (*argv) {
    168 //bb_error_msg("\"rule show\" needs no arguments");
    169 bb_warn_ignoring_args(*argv);
    170 return -1;
    171 }
    172
    173 xrtnl_open(&rth);
    174
    175 xrtnl_wilddump_request(&rth, af, RTM_GETRULE);
    176 xrtnl_dump_filter(&rth, print_rule, NULL);
    177
    178 return 0;
    179 }
    180
    181 /* Return value becomes exitcode. It's okay to not return at all */
    182 static int iprule_modify(int cmd, char **argv)
    183 {
    184 static const char keywords[] ALIGN1 =
    185 "from\0""to\0""preference\0""order\0""priority\0"
    186 "tos\0""fwmark\0""realms\0""table\0""lookup\0""dev\0"
    187 "iif\0""nat\0""map-to\0""type\0""help\0";
    188 enum {
    189 ARG_from = 1, ARG_to, ARG_preference, ARG_order, ARG_priority,
    190 ARG_tos, ARG_fwmark, ARG_realms, ARG_table, ARG_lookup, ARG_dev,
    191 ARG_iif, ARG_nat, ARG_map_to, ARG_type, ARG_help
    192 };
    193 bool table_ok = 0;
    194 struct rtnl_handle rth;
    195 struct {
    196 struct nlmsghdr n;
    197 struct rtmsg r;
    198 char buf[1024];
    199 } req;
    200 smalluint key;
    201
    202 memset(&req, 0, sizeof(req));
    203
    204 req.n.nlmsg_type = cmd;
    205 req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
    206 req.n.nlmsg_flags = NLM_F_REQUEST;
    207 req.r.rtm_family = preferred_family;
    208 req.r.rtm_protocol = RTPROT_BOOT;
    209 req.r.rtm_scope = RT_SCOPE_UNIVERSE;
    210 req.r.rtm_table = 0;
    211 req.r.rtm_type = RTN_UNSPEC;
    212
    213 if (cmd == RTM_NEWRULE) {
    214 req.n.nlmsg_flags |= NLM_F_CREATE|NLM_F_EXCL;
    215 req.r.rtm_type = RTN_UNICAST;
    216 }
    217
    218 while (*argv) {
    219 key = index_in_substrings(keywords, *argv) + 1;
    220 if (key == 0) /* no match found in keywords array, bail out. */
    221 bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name);
    222 if (key == ARG_from) {
    223 inet_prefix dst;
    224 NEXT_ARG();
    225 get_prefix(&dst, *argv, req.r.rtm_family);
    226 req.r.rtm_src_len = dst.bitlen;
    227 addattr_l(&req.n, sizeof(req), RTA_SRC, &dst.data, dst.bytelen);
    228 } else if (key == ARG_to) {
    229 inet_prefix dst;
    230 NEXT_ARG();
    231 get_prefix(&dst, *argv, req.r.rtm_family);
    232 req.r.rtm_dst_len = dst.bitlen;
    233 addattr_l(&req.n, sizeof(req), RTA_DST, &dst.data, dst.bytelen);
    234 } else if (key == ARG_preference ||
    235 key == ARG_order ||
    236 key == ARG_priority) {
    237 uint32_t pref;
    238 NEXT_ARG();
    239 pref = get_u32(*argv, "preference");
    240 addattr32(&req.n, sizeof(req), RTA_PRIORITY, pref);
    241 } else if (key == ARG_tos) {
    242 uint32_t tos;
    243 NEXT_ARG();
    244 if (rtnl_dsfield_a2n(&tos, *argv))
    245 invarg(*argv, "TOS");
    246 req.r.rtm_tos = tos;
    247 } else if (key == ARG_fwmark) {
    248 uint32_t fwmark;
    249 NEXT_ARG();
    250 fwmark = get_u32(*argv, "fwmark");
    251 addattr32(&req.n, sizeof(req), RTA_PROTOINFO, fwmark);
    252 } else if (key == ARG_realms) {
    253 uint32_t realm;
    254 NEXT_ARG();
    255 if (get_rt_realms(&realm, *argv))
    256 invarg(*argv, "realms");
    257 addattr32(&req.n, sizeof(req), RTA_FLOW, realm);
    258 } else if (key == ARG_table ||
    259 key == ARG_lookup) {
    260 uint32_t tid;
    261 NEXT_ARG();
    262 if (rtnl_rttable_a2n(&tid, *argv))
    263 invarg(*argv, "table ID");
    264 req.r.rtm_table = tid;
    265 table_ok = 1;
    266 } else if (key == ARG_dev ||
    267 key == ARG_iif) {
    268 NEXT_ARG();
    269 addattr_l(&req.n, sizeof(req), RTA_IIF, *argv, strlen(*argv)+1);
    270 } else if (key == ARG_nat ||
    271 key == ARG_map_to) {
    272 NEXT_ARG();
    273 addattr32(&req.n, sizeof(req), RTA_GATEWAY, get_addr32(*argv));
    274 req.r.rtm_type = RTN_NAT;
    275 } else {
    276 int type;
    277
    278 if (key == ARG_type) {
    279 NEXT_ARG();
    280 }
    281 if (key == ARG_help)
    282 bb_show_usage();
    283 if (rtnl_rtntype_a2n(&type, *argv))
    284 invarg(*argv, "type");
    285 req.r.rtm_type = type;
    286 }
    287 argv++;
    288 }
    289
    290 if (req.r.rtm_family == AF_UNSPEC)
    291 req.r.rtm_family = AF_INET;
    292
    293 if (!table_ok && cmd == RTM_NEWRULE)
    294 req.r.rtm_table = RT_TABLE_MAIN;
    295
    296 xrtnl_open(&rth);
    297
    298 if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
    299 return 2;
    300
    301 return 0;
    302 }
    303
    304 /* Return value becomes exitcode. It's okay to not return at all */
    305 int do_iprule(char **argv)
    306 {
    307 static const char ip_rule_commands[] ALIGN1 =
    308 "add\0""delete\0""list\0""show\0";
    309 int cmd = 2; /* list */
    310
    311 if (!*argv)
    312 return iprule_list(argv);
    313
    314 cmd = index_in_substrings(ip_rule_commands, *argv);
    315 switch (cmd) {
    316 case 0: /* add */
    317 cmd = RTM_NEWRULE;
    318 break;
    319 case 1: /* delete */
    320 cmd = RTM_DELRULE;
    321 break;
    322 case 2: /* list */
    323 case 3: /* show */
    324 return iprule_list(argv+1);
    325 break;
    326 default:
    327 bb_error_msg_and_die("unknown command %s", *argv);
    328 }
    329 return iprule_modify(cmd, argv+1);
    330 }