mirror of
https://git.kernel.org/pub/scm/network/iproute2/iproute2.git
synced 2024-11-24 02:13:33 +08:00
324 lines
8.1 KiB
C
324 lines
8.1 KiB
C
/*
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* iprule.c "ip rule".
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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*
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*
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* Changes:
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*
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* Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <syslog.h>
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#include <fcntl.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netinet/ip.h>
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#include <arpa/inet.h>
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#include <string.h>
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#include "rt_names.h"
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#include "utils.h"
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static void usage(void) __attribute__((noreturn));
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static void usage(void)
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{
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fprintf(stderr, "Usage: ip rule [ list | add | del ] SELECTOR ACTION\n");
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fprintf(stderr, "SELECTOR := [ from PREFIX ] [ to PREFIX ] [ tos TOS ] [ fwmark FWMARK ]\n");
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fprintf(stderr, " [ dev STRING ] [ pref NUMBER ]\n");
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fprintf(stderr, "ACTION := [ table TABLE_ID ] [ nat ADDRESS ]\n");
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fprintf(stderr, " [ prohibit | reject | unreachable ]\n");
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fprintf(stderr, " [ realms [SRCREALM/]DSTREALM ]\n");
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fprintf(stderr, "TABLE_ID := [ local | main | default | NUMBER ]\n");
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exit(-1);
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}
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int print_rule(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
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{
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FILE *fp = (FILE*)arg;
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struct rtmsg *r = NLMSG_DATA(n);
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int len = n->nlmsg_len;
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int host_len = -1;
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struct rtattr * tb[RTA_MAX+1];
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char abuf[256];
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SPRINT_BUF(b1);
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if (n->nlmsg_type != RTM_NEWRULE)
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return 0;
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len -= NLMSG_LENGTH(sizeof(*r));
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if (len < 0)
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return -1;
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memset(tb, 0, sizeof(tb));
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parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
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if (r->rtm_family == AF_INET)
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host_len = 32;
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else if (r->rtm_family == AF_INET6)
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host_len = 128;
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else if (r->rtm_family == AF_DECnet)
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host_len = 16;
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else if (r->rtm_family == AF_IPX)
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host_len = 80;
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if (tb[RTA_PRIORITY])
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fprintf(fp, "%u:\t", *(unsigned*)RTA_DATA(tb[RTA_PRIORITY]));
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else
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fprintf(fp, "0:\t");
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if (tb[RTA_SRC]) {
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if (r->rtm_src_len != host_len) {
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fprintf(fp, "from %s/%u ", rt_addr_n2a(r->rtm_family,
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RTA_PAYLOAD(tb[RTA_SRC]),
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RTA_DATA(tb[RTA_SRC]),
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abuf, sizeof(abuf)),
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r->rtm_src_len
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);
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} else {
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fprintf(fp, "from %s ", format_host(r->rtm_family,
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RTA_PAYLOAD(tb[RTA_SRC]),
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RTA_DATA(tb[RTA_SRC]),
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abuf, sizeof(abuf))
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);
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}
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} else if (r->rtm_src_len) {
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fprintf(fp, "from 0/%d ", r->rtm_src_len);
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} else {
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fprintf(fp, "from all ");
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}
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if (tb[RTA_DST]) {
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if (r->rtm_dst_len != host_len) {
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fprintf(fp, "to %s/%u ", rt_addr_n2a(r->rtm_family,
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RTA_PAYLOAD(tb[RTA_DST]),
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RTA_DATA(tb[RTA_DST]),
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abuf, sizeof(abuf)),
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r->rtm_dst_len
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);
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} else {
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fprintf(fp, "to %s ", format_host(r->rtm_family,
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RTA_PAYLOAD(tb[RTA_DST]),
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RTA_DATA(tb[RTA_DST]),
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abuf, sizeof(abuf)));
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}
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} else if (r->rtm_dst_len) {
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fprintf(fp, "to 0/%d ", r->rtm_dst_len);
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}
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if (r->rtm_tos) {
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SPRINT_BUF(b1);
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fprintf(fp, "tos %s ", rtnl_dsfield_n2a(r->rtm_tos, b1, sizeof(b1)));
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}
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if (tb[RTA_PROTOINFO]) {
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fprintf(fp, "fwmark %#x ", *(__u32*)RTA_DATA(tb[RTA_PROTOINFO]));
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}
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if (tb[RTA_IIF]) {
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fprintf(fp, "iif %s ", (char*)RTA_DATA(tb[RTA_IIF]));
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}
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if (r->rtm_table)
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fprintf(fp, "lookup %s ", rtnl_rttable_n2a(r->rtm_table, b1, sizeof(b1)));
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if (tb[RTA_FLOW]) {
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__u32 to = *(__u32*)RTA_DATA(tb[RTA_FLOW]);
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__u32 from = to>>16;
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to &= 0xFFFF;
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if (from) {
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fprintf(fp, "realms %s/",
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rtnl_rtrealm_n2a(from, b1, sizeof(b1)));
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}
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fprintf(fp, "%s ",
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rtnl_rtrealm_n2a(to, b1, sizeof(b1)));
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}
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if (r->rtm_type == RTN_NAT) {
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if (tb[RTA_GATEWAY]) {
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fprintf(fp, "map-to %s ",
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format_host(r->rtm_family,
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RTA_PAYLOAD(tb[RTA_GATEWAY]),
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RTA_DATA(tb[RTA_GATEWAY]),
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abuf, sizeof(abuf)));
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} else
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fprintf(fp, "masquerade");
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} else if (r->rtm_type != RTN_UNICAST)
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fprintf(fp, "%s", rtnl_rtntype_n2a(r->rtm_type, b1, sizeof(b1)));
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fprintf(fp, "\n");
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fflush(fp);
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return 0;
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}
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int iprule_list(int argc, char **argv)
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{
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struct rtnl_handle rth;
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int af = preferred_family;
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if (af == AF_UNSPEC)
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af = AF_INET;
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if (argc > 0) {
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fprintf(stderr, "\"ip rule show\" need not eny arguments.\n");
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return -1;
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}
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if (rtnl_open(&rth, 0) < 0)
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return 1;
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if (rtnl_wilddump_request(&rth, af, RTM_GETRULE) < 0) {
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perror("Cannot send dump request");
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return 1;
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}
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if (rtnl_dump_filter(&rth, print_rule, stdout, NULL, NULL) < 0) {
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fprintf(stderr, "Dump terminated\n");
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return 1;
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}
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return 0;
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}
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int iprule_modify(int cmd, int argc, char **argv)
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{
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int table_ok = 0;
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struct rtnl_handle rth;
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struct {
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struct nlmsghdr n;
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struct rtmsg r;
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char buf[1024];
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} req;
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memset(&req, 0, sizeof(req));
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req.n.nlmsg_type = cmd;
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req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
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req.n.nlmsg_flags = NLM_F_REQUEST;
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req.r.rtm_family = preferred_family;
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req.r.rtm_protocol = RTPROT_BOOT;
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req.r.rtm_scope = RT_SCOPE_UNIVERSE;
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req.r.rtm_table = 0;
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req.r.rtm_type = RTN_UNSPEC;
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if (cmd == RTM_NEWRULE) {
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req.n.nlmsg_flags |= NLM_F_CREATE|NLM_F_EXCL;
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req.r.rtm_type = RTN_UNICAST;
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}
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while (argc > 0) {
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if (strcmp(*argv, "from") == 0) {
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inet_prefix dst;
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NEXT_ARG();
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get_prefix(&dst, *argv, req.r.rtm_family);
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req.r.rtm_src_len = dst.bitlen;
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addattr_l(&req.n, sizeof(req), RTA_SRC, &dst.data, dst.bytelen);
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} else if (strcmp(*argv, "to") == 0) {
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inet_prefix dst;
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NEXT_ARG();
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get_prefix(&dst, *argv, req.r.rtm_family);
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req.r.rtm_dst_len = dst.bitlen;
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addattr_l(&req.n, sizeof(req), RTA_DST, &dst.data, dst.bytelen);
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} else if (matches(*argv, "preference") == 0 ||
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matches(*argv, "order") == 0 ||
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matches(*argv, "priority") == 0) {
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__u32 pref;
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NEXT_ARG();
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if (get_u32(&pref, *argv, 0))
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invarg("preference value is invalid\n", *argv);
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addattr32(&req.n, sizeof(req), RTA_PRIORITY, pref);
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} else if (strcmp(*argv, "tos") == 0) {
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__u32 tos;
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NEXT_ARG();
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if (rtnl_dsfield_a2n(&tos, *argv))
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invarg("TOS value is invalid\n", *argv);
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req.r.rtm_tos = tos;
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} else if (strcmp(*argv, "fwmark") == 0) {
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__u32 fwmark;
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NEXT_ARG();
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if (get_u32(&fwmark, *argv, 0))
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invarg("fwmark value is invalid\n", *argv);
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addattr32(&req.n, sizeof(req), RTA_PROTOINFO, fwmark);
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} else if (matches(*argv, "realms") == 0) {
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__u32 realm;
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NEXT_ARG();
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if (get_rt_realms(&realm, *argv))
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invarg("invalid realms\n", *argv);
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addattr32(&req.n, sizeof(req), RTA_FLOW, realm);
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} else if (matches(*argv, "table") == 0 ||
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strcmp(*argv, "lookup") == 0) {
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int tid;
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NEXT_ARG();
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if (rtnl_rttable_a2n(&tid, *argv))
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invarg("invalid table ID\n", *argv);
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req.r.rtm_table = tid;
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table_ok = 1;
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} else if (strcmp(*argv, "dev") == 0 ||
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strcmp(*argv, "iif") == 0) {
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NEXT_ARG();
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addattr_l(&req.n, sizeof(req), RTA_IIF, *argv, strlen(*argv)+1);
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} else if (strcmp(*argv, "nat") == 0 ||
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matches(*argv, "map-to") == 0) {
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NEXT_ARG();
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addattr32(&req.n, sizeof(req), RTA_GATEWAY, get_addr32(*argv));
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req.r.rtm_type = RTN_NAT;
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} else {
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int type;
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if (strcmp(*argv, "type") == 0) {
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NEXT_ARG();
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}
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if (matches(*argv, "help") == 0)
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usage();
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if (rtnl_rtntype_a2n(&type, *argv))
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invarg("Failed to parse rule type", *argv);
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req.r.rtm_type = type;
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}
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argc--;
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argv++;
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}
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if (req.r.rtm_family == AF_UNSPEC)
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req.r.rtm_family = AF_INET;
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if (!table_ok && cmd == RTM_NEWRULE)
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req.r.rtm_table = RT_TABLE_MAIN;
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if (rtnl_open(&rth, 0) < 0)
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return 1;
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if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
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return 2;
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return 0;
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}
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int do_iprule(int argc, char **argv)
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{
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if (argc < 1) {
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return iprule_list(0, NULL);
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} else if (matches(argv[0], "list") == 0 ||
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matches(argv[0], "lst") == 0 ||
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matches(argv[0], "show") == 0) {
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return iprule_list(argc-1, argv+1);
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} else if (matches(argv[0], "add") == 0) {
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return iprule_modify(RTM_NEWRULE, argc-1, argv+1);
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} else if (matches(argv[0], "delete") == 0) {
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return iprule_modify(RTM_DELRULE, argc-1, argv+1);
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} else if (matches(argv[0], "help") == 0)
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usage();
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fprintf(stderr, "Command \"%s\" is unknown, try \"ip rule help\".\n", *argv);
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exit(-1);
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}
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