--- /dev/null
+/* 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
+ */
+
+#include "libbb.h"
+#include <syslog.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netinet/ip.h>
+#include <arpa/inet.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 ] 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);
+}
+*/
+static int print_rule(struct sockaddr_nl *who ATTRIBUTE_UNUSED,
+ 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;
+
+ 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])
+ fprintf(fp, "%u:\t", *(unsigned*)RTA_DATA(tb[RTA_PRIORITY]));
+ else
+ fprintf(fp, "0:\t");
+
+ fprintf(fp, "from ");
+ if (tb[RTA_SRC]) {
+ if (r->rtm_src_len != host_len) {
+ fprintf(fp, "%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, "%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, "0/%d", r->rtm_src_len);
+ } else {
+ fprintf(fp, "all");
+ }
+ fprintf(fp, " ");
+
+ 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) {
+ 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;
+}
+
+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) {
+ bb_error_msg("\"rule show\" needs no arguments");
+ return -1;
+ }
+
+ if (rtnl_open(&rth, 0) < 0)
+ return 1;
+
+ if (rtnl_wilddump_request(&rth, af, RTM_GETRULE) < 0) {
+ bb_perror_msg("Cannot send dump request");
+ return 1;
+ }
+
+ if (rtnl_dump_filter(&rth, print_rule, stdout, NULL, NULL) < 0) {
+ bb_error_msg("Dump terminated");
+ return 1;
+ }
+
+ return 0;
+}
+
+
+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", *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", *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", *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("realms", *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("table ID", *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();
+ 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)
+ bb_show_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;
+}
+
+int do_iprule(int argc, char **argv)
+{
+ static const char * const ip_rule_commands[] =
+ {"add", "delete", "list", "show", 0};
+ int command_num = 2;
+ int cmd;
+
+ if (argc < 1)
+ return iprule_list(0, NULL);
+ if (*argv)
+ command_num = index_in_substr_array(ip_rule_commands, *argv);
+ switch (command_num) {
+ case 0: /* add */
+ cmd = RTM_NEWRULE;
+ break;
+ case 1: /* delete */
+ cmd = RTM_DELRULE;
+ break;
+ case 2: /* list */
+ case 3: /* show */
+ return iprule_list(argc-1, argv+1);
+ break;
+ default:
+ bb_error_msg_and_die("unknown command %s", *argv);
+ }
+ return iprule_modify(cmd, argc-1, argv+1);
+}
+
return 0;
}
-
+#if ENABLE_FEATURE_IP_RULE
+const char * rtnl_rtrealm_n2a(int id, char *buf, int len)
+{
+ if (id<0 || id>=256) {
+ snprintf(buf, len, "%d", id);
+ return buf;
+ }
+ if (!rtnl_rtrealm_tab[id]) {
+ if (!rtnl_rtrealm_init)
+ rtnl_rtrealm_initialize();
+ }
+ if (rtnl_rtrealm_tab[id])
+ return rtnl_rtrealm_tab[id];
+ snprintf(buf, len, "%d", id);
+ return buf;
+}
+#endif
static const char * rtnl_rtdsfield_tab[256] = {
"0",
*id = res;
return 0;
}
+
+#if ENABLE_FEATURE_IP_RULE
+static int rtnl_rttable_init;
+static const char * rtnl_rttable_tab[256] = {
+ "unspec",
+};
+static void rtnl_rttable_initialize(void)
+{
+ rtnl_rttable_init = 1;
+ rtnl_rttable_tab[255] = "local";
+ rtnl_rttable_tab[254] = "main";
+ rtnl_rttable_tab[253] = "default";
+ rtnl_tab_initialize("/etc/iproute2/rt_tables", rtnl_rttable_tab, 256);
+}
+
+const char *rtnl_rttable_n2a(int id, char *buf, int len)
+{
+ if (id < 0 || id >= 256) {
+ snprintf(buf, len, "%d", id);
+ return buf;
+ }
+ if (!rtnl_rttable_tab[id]) {
+ if (!rtnl_rttable_init)
+ rtnl_rttable_initialize();
+ }
+ if (rtnl_rttable_tab[id])
+ return rtnl_rttable_tab[id];
+ snprintf(buf, len, "%d", id);
+ return buf;
+}
+
+int rtnl_rttable_a2n(uint32_t * id, char *arg)
+{
+ static char *cache = NULL;
+ static unsigned long res;
+ char *end;
+ int i;
+
+ if (cache && strcmp(cache, arg) == 0) {
+ *id = res;
+ return 0;
+ }
+
+ if (!rtnl_rttable_init)
+ rtnl_rttable_initialize();
+
+ for (i = 0; i < 256; i++) {
+ if (rtnl_rttable_tab[i] && strcmp(rtnl_rttable_tab[i], arg) == 0) {
+ cache = (char*)rtnl_rttable_tab[i];
+ res = i;
+ *id = res;
+ return 0;
+ }
+ }
+
+ i = strtoul(arg, &end, 0);
+ if (!end || end == arg || *end || i > 255)
+ return -1;
+ *id = i;
+ return 0;
+}
+
+#endif
projects / oweals / busybox.git / commitdiff