Add NAT action
Here's a patch to add support for the nat action which is now in the kernel. Thanks, -- Visit Openswan at http://www.openswan.org/ Email: Herbert Xu ~{PmV>HI~} <herbert@gondor.apana.org.au> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt -- Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
This commit is contained in:
Herbert Xu
Stephen Hemminger
parent
037c635eee
commit
fc2d02069b
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@ -27,6 +27,7 @@ TCMODULES += q_htb.o
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TCMODULES += m_gact.o
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TCMODULES += m_mirred.o
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TCMODULES += m_ipt.o
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TCMODULES += m_nat.o
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TCMODULES += m_pedit.o
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TCMODULES += p_ip.o
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TCMODULES += p_icmp.o
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@ -0,0 +1,213 @@
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/*
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* m_nat.c NAT module
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*
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* This program is free software; you can distribute 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: Herbert Xu <herbert@gondor.apana.org.au>
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*
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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 <arpa/inet.h>
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#include <string.h>
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#include <dlfcn.h>
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#include "utils.h"
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#include "tc_util.h"
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#include <linux/tc_act/tc_nat.h>
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static void
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explain(void)
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{
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fprintf(stderr, "Usage: ... nat NAT\n"
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"NAT := DIRECTION OLD NEW\n"
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"DIRECTION := { ingress | egress }\n"
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"OLD := PREFIX\n"
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"NEW := ADDRESS\n");
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}
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static void
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usage(void)
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{
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explain();
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exit(-1);
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}
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static int
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parse_nat_args(int *argc_p, char ***argv_p,struct tc_nat *sel)
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{
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int argc = *argc_p;
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char **argv = *argv_p;
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inet_prefix addr;
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if (argc <= 0)
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return -1;
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if (matches(*argv, "egress") == 0)
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sel->flags |= TCA_NAT_FLAG_EGRESS;
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else if (matches(*argv, "ingress") != 0)
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goto bad_val;
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NEXT_ARG();
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if (get_prefix_1(&addr, *argv, AF_INET))
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goto bad_val;
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sel->old_addr = addr.data[0];
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sel->mask = htonl(~0u << (32 - addr.bitlen));
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NEXT_ARG();
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if (get_prefix_1(&addr, *argv, AF_INET))
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goto bad_val;
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sel->new_addr = addr.data[0];
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argc--;
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argv++;
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*argc_p = argc;
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*argv_p = argv;
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return 0;
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bad_val:
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return -1;
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}
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static int
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parse_nat(struct action_util *a, int *argc_p, char ***argv_p, int tca_id, struct nlmsghdr *n)
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{
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struct tc_nat sel;
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int argc = *argc_p;
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char **argv = *argv_p;
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int ok = 0;
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struct rtattr *tail;
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memset(&sel, 0, sizeof(sel));
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while (argc > 0) {
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if (matches(*argv, "nat") == 0) {
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NEXT_ARG();
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if (parse_nat_args(&argc, &argv, &sel)) {
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fprintf(stderr, "Illegal nat construct (%s) \n",
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*argv);
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explain();
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return -1;
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}
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ok++;
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continue;
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} else if (matches(*argv, "help") == 0) {
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usage();
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} else {
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break;
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}
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}
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if (!ok) {
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explain();
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return -1;
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}
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if (argc) {
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if (matches(*argv, "reclassify") == 0) {
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sel.action = TC_ACT_RECLASSIFY;
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argc--;
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argv++;
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} else if (matches(*argv, "pipe") == 0) {
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sel.action = TC_ACT_PIPE;
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argc--;
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argv++;
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} else if (matches(*argv, "drop") == 0 ||
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matches(*argv, "shot") == 0) {
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sel.action = TC_ACT_SHOT;
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argc--;
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argv++;
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} else if (matches(*argv, "continue") == 0) {
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sel.action = TC_ACT_UNSPEC;
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argc--;
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argv++;
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} else if (matches(*argv, "pass") == 0) {
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sel.action = TC_ACT_OK;
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argc--;
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argv++;
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}
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}
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if (argc) {
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if (matches(*argv, "index") == 0) {
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NEXT_ARG();
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if (get_u32(&sel.index, *argv, 10)) {
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fprintf(stderr, "Pedit: Illegal \"index\"\n");
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return -1;
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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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tail = NLMSG_TAIL(n);
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addattr_l(n, MAX_MSG, tca_id, NULL, 0);
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addattr_l(n, MAX_MSG, TCA_NAT_PARMS, &sel, sizeof(sel));
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tail->rta_len = (char *)NLMSG_TAIL(n) - (char *)tail;
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*argc_p = argc;
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*argv_p = argv;
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return 0;
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}
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static int
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print_nat(struct action_util *au,FILE * f, struct rtattr *arg)
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{
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struct tc_nat *sel;
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struct rtattr *tb[TCA_NAT_MAX + 1];
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char buf1[256];
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char buf2[256];
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SPRINT_BUF(buf3);
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int len;
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if (arg == NULL)
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return -1;
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parse_rtattr_nested(tb, TCA_NAT_MAX, arg);
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if (tb[TCA_NAT_PARMS] == NULL) {
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fprintf(f, "[NULL nat parameters]");
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return -1;
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}
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sel = RTA_DATA(tb[TCA_NAT_PARMS]);
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len = ffs(sel->mask);
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len = len ? 33 - len : 0;
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fprintf(f, " nat %s %s/%d %s %s", sel->flags & TCA_NAT_FLAG_EGRESS ?
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"egress" : "ingress",
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format_host(AF_INET, 4, &sel->old_addr, buf1, sizeof(buf1)),
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len,
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format_host(AF_INET, 4, &sel->new_addr, buf2, sizeof(buf2)),
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action_n2a(sel->action, buf3, sizeof (buf3)));
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if (show_stats) {
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if (tb[TCA_NAT_TM]) {
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struct tcf_t *tm = RTA_DATA(tb[TCA_NAT_TM]);
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print_tm(f,tm);
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}
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}
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return 0;
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}
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struct action_util nat_action_util = {
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.id = "nat",
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.parse_aopt = parse_nat,
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.print_aopt = print_nat,
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};
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