busybox/networking/libiproute/iprule.c

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/* 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 <netinet/in.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
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#include "ip_common.h" /* #include "libbb.h" is inside */
#include "rt_names.h"
#include "utils.h"
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/*
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);
}
*/
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static int print_rule(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;
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])
printf("%u:\t", *(unsigned*)RTA_DATA(tb[RTA_PRIORITY]));
else
printf("0:\t");
printf("from ");
if (tb[RTA_SRC]) {
if (r->rtm_src_len != host_len) {
printf("%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)), stdout);
}
} else if (r->rtm_src_len) {
printf("0/%d", r->rtm_src_len);
} else {
printf("all");
}
bb_putchar(' ');
if (tb[RTA_DST]) {
if (r->rtm_dst_len != host_len) {
printf("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 {
printf("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) {
printf("to 0/%d ", r->rtm_dst_len);
}
if (r->rtm_tos) {
printf("tos %s ", rtnl_dsfield_n2a(r->rtm_tos, b1, sizeof(b1)));
}
if (tb[RTA_PROTOINFO]) {
printf("fwmark %#x ", *(uint32_t*)RTA_DATA(tb[RTA_PROTOINFO]));
}
if (tb[RTA_IIF]) {
printf("iif %s ", (char*)RTA_DATA(tb[RTA_IIF]));
}
if (r->rtm_table)
printf("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) {
printf("realms %s/",
rtnl_rtrealm_n2a(from, b1, sizeof(b1)));
}
printf("%s ",
rtnl_rtrealm_n2a(to, b1, sizeof(b1)));
}
if (r->rtm_type == RTN_NAT) {
if (tb[RTA_GATEWAY]) {
printf("map-to %s ",
format_host(r->rtm_family,
RTA_PAYLOAD(tb[RTA_GATEWAY]),
RTA_DATA(tb[RTA_GATEWAY]),
abuf, sizeof(abuf)));
} else
printf("masquerade");
} else if (r->rtm_type != RTN_UNICAST)
fputs(rtnl_rtntype_n2a(r->rtm_type, b1, sizeof(b1)), stdout);
bb_putchar('\n');
/*fflush(stdout);*/
return 0;
}
/* Return value becomes exitcode. It's okay to not return at all */
static int iprule_list(char **argv)
{
struct rtnl_handle rth;
int af = preferred_family;
if (af == AF_UNSPEC)
af = AF_INET;
if (*argv) {
//bb_error_msg("\"rule show\" needs no arguments");
bb_warn_ignoring_args(1);
return -1;
}
xrtnl_open(&rth);
xrtnl_wilddump_request(&rth, af, RTM_GETRULE);
xrtnl_dump_filter(&rth, print_rule, NULL);
return 0;
}
/* Return value becomes exitcode. It's okay to not return at all */
static int iprule_modify(int cmd, 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 (*argv) {
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;
}
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(char **argv)
{
static const char ip_rule_commands[] ALIGN1 =
"add\0""delete\0""list\0""show\0";
int cmd = 2; /* list */
if (!*argv)
return iprule_list(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(argv+1);
break;
default:
bb_error_msg_and_die("unknown command %s", *argv);
}
return iprule_modify(cmd, argv+1);
}