4 * This program is free software; you can distribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * Authors: Herbert Xu <herbert@gondor.apana.org.au>
17 #include <sys/socket.h>
18 #include <netinet/in.h>
19 #include <arpa/inet.h>
23 #include <linux/tc_act/tc_nat.h>
28 fprintf(stderr, "Usage: ... nat NAT\n"
29 "NAT := DIRECTION OLD NEW\n"
30 "DIRECTION := { ingress | egress }\n"
43 parse_nat_args(int *argc_p, char ***argv_p, struct tc_nat *sel)
46 char **argv = *argv_p;
52 if (matches(*argv, "egress") == 0)
53 sel->flags |= TCA_NAT_FLAG_EGRESS;
54 else if (matches(*argv, "ingress") != 0)
59 if (get_prefix_1(&addr, *argv, AF_INET))
62 sel->old_addr = addr.data[0];
63 sel->mask = htonl(~0u << (32 - addr.bitlen));
67 if (get_prefix_1(&addr, *argv, AF_INET))
70 sel->new_addr = addr.data[0];
84 parse_nat(struct action_util *a, int *argc_p, char ***argv_p, int tca_id, struct nlmsghdr *n)
86 struct tc_nat sel = {};
89 char **argv = *argv_p;
94 if (matches(*argv, "nat") == 0) {
96 if (parse_nat_args(&argc, &argv, &sel)) {
97 fprintf(stderr, "Illegal nat construct (%s)\n",
104 } else if (matches(*argv, "help") == 0) {
117 parse_action_control_dflt(&argc, &argv, &sel.action, false, TC_ACT_OK);
120 if (matches(*argv, "index") == 0) {
122 if (get_u32(&sel.index, *argv, 10)) {
123 fprintf(stderr, "Nat: Illegal \"index\"\n");
131 tail = addattr_nest(n, MAX_MSG, tca_id);
132 addattr_l(n, MAX_MSG, TCA_NAT_PARMS, &sel, sizeof(sel));
133 addattr_nest_end(n, tail);
141 print_nat(struct action_util *au, FILE * f, struct rtattr *arg)
144 struct rtattr *tb[TCA_NAT_MAX + 1];
152 parse_rtattr_nested(tb, TCA_NAT_MAX, arg);
154 if (tb[TCA_NAT_PARMS] == NULL) {
155 fprintf(stderr, "Missing nat parameters\n");
158 sel = RTA_DATA(tb[TCA_NAT_PARMS]);
160 len = ffs(sel->mask);
161 len = len ? 33 - len : 0;
163 print_string(PRINT_ANY, "type", " %s ", "nat");
164 print_string(PRINT_ANY, "direction", "%s",
165 sel->flags & TCA_NAT_FLAG_EGRESS ? "egress" : "ingress");
167 snprintf(buf2, sizeof(buf2), "%s/%d",
168 format_host_r(AF_INET, 4, &sel->old_addr, buf1, sizeof(buf1)),
170 print_string(PRINT_ANY, "old_addr", " %s", buf2);
171 print_string(PRINT_ANY, "new_addr", " %s",
172 format_host_r(AF_INET, 4, &sel->new_addr, buf1, sizeof(buf1)));
174 print_action_control(f, " ", sel->action, "");
175 print_string(PRINT_FP, NULL, "%s", _SL_);
176 print_uint(PRINT_ANY, "index", "\t index %u", sel->index);
177 print_int(PRINT_ANY, "ref", " ref %d", sel->refcnt);
178 print_int(PRINT_ANY, "bind", " bind %d", sel->bindcnt);
181 if (tb[TCA_NAT_TM]) {
182 struct tcf_t *tm = RTA_DATA(tb[TCA_NAT_TM]);
188 print_string(PRINT_FP, NULL, "%s", _SL_);
193 struct action_util nat_action_util = {
195 .parse_aopt = parse_nat,
196 .print_aopt = print_nat,