--- /dev/null
+/*
+ * 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
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <syslog.h>
+#include <fcntl.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netinet/ip.h>
+#include <arpa/inet.h>
+#include <string.h>
+
+#include "rt_names.h"
+#include "utils.h"
+
+static void usage(void) __attribute__((noreturn));
+
+static void usage(void)
+{
+ fprintf(stderr, "Usage: ip rule [ list | add | del | flush ] 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 ]\n");
+ fprintf(stderr, " [ prohibit | reject | unreachable ]\n");
+ fprintf(stderr, " [ realms [SRCREALM/]DSTREALM ]\n");
+ fprintf(stderr, "TABLE_ID := [ local | main | default | NUMBER ]\n");
+ exit(-1);
+}
+
+static int print_rule(const struct sockaddr_nl *who, struct nlmsghdr *n,
+ void *arg)
+{
+ FILE *fp = (FILE*)arg;
+ 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;
+
+ 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])
+ fprintf(fp, "%u:\t", *(unsigned*)RTA_DATA(tb[RTA_PRIORITY]));
+ else
+ fprintf(fp, "0:\t");
+
+ if (tb[RTA_SRC]) {
+ if (r->rtm_src_len != host_len) {
+ fprintf(fp, "from %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 {
+ fprintf(fp, "from %s ", format_host(r->rtm_family,
+ RTA_PAYLOAD(tb[RTA_SRC]),
+ RTA_DATA(tb[RTA_SRC]),
+ abuf, sizeof(abuf))
+ );
+ }
+ } else if (r->rtm_src_len) {
+ fprintf(fp, "from 0/%d ", r->rtm_src_len);
+ } else {
+ fprintf(fp, "from all ");
+ }
+
+ if (tb[RTA_DST]) {
+ if (r->rtm_dst_len != host_len) {
+ fprintf(fp, "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 {
+ fprintf(fp, "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) {
+ fprintf(fp, "to 0/%d ", r->rtm_dst_len);
+ }
+
+ if (r->rtm_tos) {
+ SPRINT_BUF(b1);
+ fprintf(fp, "tos %s ", rtnl_dsfield_n2a(r->rtm_tos, b1, sizeof(b1)));
+ }
+ if (tb[RTA_PROTOINFO]) {
+ fprintf(fp, "fwmark %#x ", *(__u32*)RTA_DATA(tb[RTA_PROTOINFO]));
+ }
+
+ if (tb[RTA_IIF]) {
+ fprintf(fp, "iif %s ", (char*)RTA_DATA(tb[RTA_IIF]));
+ }
+
+ if (r->rtm_table)
+ fprintf(fp, "lookup %s ", rtnl_rttable_n2a(r->rtm_table, b1, sizeof(b1)));
+
+ if (tb[RTA_FLOW]) {
+ __u32 to = *(__u32*)RTA_DATA(tb[RTA_FLOW]);
+ __u32 from = to>>16;
+ to &= 0xFFFF;
+ if (from) {
+ fprintf(fp, "realms %s/",
+ rtnl_rtrealm_n2a(from, b1, sizeof(b1)));
+ }
+ fprintf(fp, "%s ",
+ rtnl_rtrealm_n2a(to, b1, sizeof(b1)));
+ }
+
+ if (r->rtm_type == RTN_NAT) {
+ if (tb[RTA_GATEWAY]) {
+ fprintf(fp, "map-to %s ",
+ format_host(r->rtm_family,
+ RTA_PAYLOAD(tb[RTA_GATEWAY]),
+ RTA_DATA(tb[RTA_GATEWAY]),
+ abuf, sizeof(abuf)));
+ } else
+ fprintf(fp, "masquerade");
+ } else if (r->rtm_type != RTN_UNICAST)
+ fprintf(fp, "%s", rtnl_rtntype_n2a(r->rtm_type, b1, sizeof(b1)));
+
+ fprintf(fp, "\n");
+ fflush(fp);
+ return 0;
+}
+
+static int iprule_list(int argc, char **argv)
+{
+ struct rtnl_handle rth;
+ int af = preferred_family;
+
+ if (af == AF_UNSPEC)
+ af = AF_INET;
+
+ if (argc > 0) {
+ fprintf(stderr, "\"ip rule show\" does not take any arguments.\n");
+ return -1;
+ }
+
+ if (rtnl_open(&rth, 0) < 0)
+ return 1;
+
+ if (rtnl_wilddump_request(&rth, af, RTM_GETRULE) < 0) {
+ perror("Cannot send dump request");
+ return 1;
+ }
+
+ if (rtnl_dump_filter(&rth, print_rule, stdout, NULL, NULL) < 0) {
+ fprintf(stderr, "Dump terminated\n");
+ return 1;
+ }
+
+ return 0;
+}
+
+
+static int iprule_modify(int cmd, int argc, char **argv)
+{
+ int table_ok = 0;
+ struct rtnl_handle rth;
+ struct {
+ struct nlmsghdr n;
+ struct rtmsg r;
+ char buf[1024];
+ } req;
+
+ 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 (argc > 0) {
+ if (strcmp(*argv, "from") == 0) {
+ 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 (strcmp(*argv, "to") == 0) {
+ 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 (matches(*argv, "preference") == 0 ||
+ matches(*argv, "order") == 0 ||
+ matches(*argv, "priority") == 0) {
+ __u32 pref;
+ NEXT_ARG();
+ if (get_u32(&pref, *argv, 0))
+ invarg("preference value is invalid\n", *argv);
+ addattr32(&req.n, sizeof(req), RTA_PRIORITY, pref);
+ } else if (strcmp(*argv, "tos") == 0) {
+ __u32 tos;
+ NEXT_ARG();
+ if (rtnl_dsfield_a2n(&tos, *argv))
+ invarg("TOS value is invalid\n", *argv);
+ req.r.rtm_tos = tos;
+ } else if (strcmp(*argv, "fwmark") == 0) {
+ __u32 fwmark;
+ NEXT_ARG();
+ if (get_u32(&fwmark, *argv, 0))
+ invarg("fwmark value is invalid\n", *argv);
+ addattr32(&req.n, sizeof(req), RTA_PROTOINFO, fwmark);
+ } else if (matches(*argv, "realms") == 0) {
+ __u32 realm;
+ NEXT_ARG();
+ if (get_rt_realms(&realm, *argv))
+ invarg("invalid realms\n", *argv);
+ addattr32(&req.n, sizeof(req), RTA_FLOW, realm);
+ } else if (matches(*argv, "table") == 0 ||
+ strcmp(*argv, "lookup") == 0) {
+ int tid;
+ NEXT_ARG();
+ if (rtnl_rttable_a2n(&tid, *argv))
+ invarg("invalid table ID\n", *argv);
+ req.r.rtm_table = tid;
+ table_ok = 1;
+ } else if (strcmp(*argv, "dev") == 0 ||
+ strcmp(*argv, "iif") == 0) {
+ NEXT_ARG();
+ addattr_l(&req.n, sizeof(req), RTA_IIF, *argv, strlen(*argv)+1);
+ } else if (strcmp(*argv, "nat") == 0 ||
+ matches(*argv, "map-to") == 0) {
+ NEXT_ARG();
+ fprintf(stderr, "Warning: route NAT is deprecated\n");
+ addattr32(&req.n, sizeof(req), RTA_GATEWAY, get_addr32(*argv));
+ req.r.rtm_type = RTN_NAT;
+ } else {
+ int type;
+
+ if (strcmp(*argv, "type") == 0) {
+ NEXT_ARG();
+ }
+ if (matches(*argv, "help") == 0)
+ usage();
+ if (rtnl_rtntype_a2n(&type, *argv))
+ invarg("Failed to parse rule type", *argv);
+ req.r.rtm_type = type;
+ }
+ argc--;
+ 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;
+
+ if (rtnl_open(&rth, 0) < 0)
+ return 1;
+
+ if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
+ return 2;
+
+ return 0;
+}
+
+
+static int flush_rule(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
+{
+ struct rtnl_handle rth;
+ struct rtmsg *r = NLMSG_DATA(n);
+ int len = n->nlmsg_len;
+ struct rtattr * tb[RTA_MAX+1];
+
+ len -= NLMSG_LENGTH(sizeof(*r));
+ if (len < 0)
+ return -1;
+
+ parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
+
+ if (tb[RTA_PRIORITY]) {
+ n->nlmsg_type = RTM_DELRULE;
+ n->nlmsg_flags = NLM_F_REQUEST;
+
+ if (rtnl_open(&rth, 0) < 0)
+ return -1;
+
+ if (rtnl_talk(&rth, n, 0, 0, NULL, NULL, NULL) < 0)
+ return -2;
+ }
+
+ return 0;
+}
+
+static int iprule_flush(int argc, char **argv)
+{
+ struct rtnl_handle rth;
+ int af = preferred_family;
+
+ if (af == AF_UNSPEC)
+ af = AF_INET;
+
+ if (argc > 0) {
+ fprintf(stderr, "\"ip rule flush\" need not any arguments.\n");
+ return -1;
+ }
+
+ if (rtnl_open(&rth, 0) < 0)
+ return 1;
+
+ if (rtnl_wilddump_request(&rth, af, RTM_GETRULE) < 0) {
+ perror("Cannot send dump request");
+ return 1;
+ }
+
+ if (rtnl_dump_filter(&rth, flush_rule, NULL, NULL, NULL) < 0) {
+ fprintf(stderr, "Flush terminated\n");
+ return 1;
+ }
+
+ return 0;
+}
+
+int do_iprule(int argc, char **argv)
+{
+ if (argc < 1) {
+ return iprule_list(0, NULL);
+ } else if (matches(argv[0], "list") == 0 ||
+ matches(argv[0], "lst") == 0 ||
+ matches(argv[0], "show") == 0) {
+ return iprule_list(argc-1, argv+1);
+ } else if (matches(argv[0], "add") == 0) {
+ return iprule_modify(RTM_NEWRULE, argc-1, argv+1);
+ } else if (matches(argv[0], "delete") == 0) {
+ return iprule_modify(RTM_DELRULE, argc-1, argv+1);
+ } else if (matches(argv[0], "flush") == 0) {
+ return iprule_flush(argc-1, argv+1);
+ } else if (matches(argv[0], "help") == 0)
+ usage();
+
+ fprintf(stderr, "Command \"%s\" is unknown, try \"ip rule help\".\n", *argv);
+ exit(-1);
+}
+