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@@ -0,0 +1,331 @@
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+/* vi: set sw=4 ts=4: */
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+/*
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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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+
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+#include "libbb.h"
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+#include <syslog.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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+
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+#include "rt_names.h"
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+#include "utils.h"
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+/*
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+static void usage(void) __attribute__((noreturn));
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+
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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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+*/
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+static int print_rule(struct sockaddr_nl *who ATTRIBUTE_UNUSED,
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+ 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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+
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+ if (n->nlmsg_type != RTM_NEWRULE)
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+ return 0;
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+
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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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+
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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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+
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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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+*/
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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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+
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+ fprintf(fp, "from ");
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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, "%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, "%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, "0/%d", r->rtm_src_len);
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+ } else {
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+ fprintf(fp, "all");
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+ }
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+ fprintf(fp, " ");
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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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+
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+ if (r->rtm_tos) {
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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+ if (af == AF_UNSPEC)
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+ af = AF_INET;
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+
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+ if (argc > 0) {
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+ bb_error_msg("\"rule show\" needs no arguments");
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+ return -1;
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+ }
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+
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+ if (rtnl_open(&rth, 0) < 0)
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+ return 1;
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+
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+ if (rtnl_wilddump_request(&rth, af, RTM_GETRULE) < 0) {
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+ bb_perror_msg("Cannot send dump request");
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+ return 1;
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+ }
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+
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+ if (rtnl_dump_filter(&rth, print_rule, stdout, NULL, NULL) < 0) {
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+ bb_error_msg("Dump terminated");
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+ return 1;
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+ }
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+
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+ return 0;
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+}
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+
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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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+
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+ memset(&req, 0, sizeof(req));
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+
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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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+
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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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+
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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", *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", *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", *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("realms", *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("table ID", *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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+
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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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+ bb_show_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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+
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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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+
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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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+
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+ if (rtnl_open(&rth, 0) < 0)
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+ return 1;
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+
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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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+
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+ return 0;
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+}
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+
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+int do_iprule(int argc, char **argv)
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+{
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+ static const char * const ip_rule_commands[] =
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+ {"add", "delete", "list", "show", 0};
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+ int command_num = 2;
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+ int cmd;
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+
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+ if (argc < 1)
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+ return iprule_list(0, NULL);
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+ if (*argv)
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+ command_num = index_in_substr_array(ip_rule_commands, *argv);
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+ switch (command_num) {
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+ case 0: /* add */
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+ cmd = RTM_NEWRULE;
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+ break;
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+ case 1: /* delete */
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+ cmd = RTM_DELRULE;
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+ break;
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+ case 2: /* list */
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+ case 3: /* show */
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+ return iprule_list(argc-1, argv+1);
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+ break;
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+ default:
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+ bb_error_msg_and_die("unknown command %s", *argv);
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+ }
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+ return iprule_modify(cmd, argc-1, argv+1);
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+}
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+
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