Herbert Xu | fc2d020 | 2007-10-12 17:08:40 +0800 | [diff] [blame] | 1 | /* |
| 2 | * m_nat.c NAT module |
| 3 | * |
| 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. |
| 8 | * |
| 9 | * Authors: Herbert Xu <herbert@gondor.apana.org.au> |
| 10 | * |
| 11 | */ |
| 12 | |
| 13 | #include <stdio.h> |
| 14 | #include <stdlib.h> |
| 15 | #include <unistd.h> |
| 16 | #include <syslog.h> |
| 17 | #include <fcntl.h> |
| 18 | #include <sys/socket.h> |
| 19 | #include <netinet/in.h> |
| 20 | #include <arpa/inet.h> |
| 21 | #include <string.h> |
Herbert Xu | fc2d020 | 2007-10-12 17:08:40 +0800 | [diff] [blame] | 22 | #include "utils.h" |
| 23 | #include "tc_util.h" |
| 24 | #include <linux/tc_act/tc_nat.h> |
| 25 | |
| 26 | static void |
| 27 | explain(void) |
| 28 | { |
| 29 | fprintf(stderr, "Usage: ... nat NAT\n" |
| 30 | "NAT := DIRECTION OLD NEW\n" |
| 31 | "DIRECTION := { ingress | egress }\n" |
| 32 | "OLD := PREFIX\n" |
| 33 | "NEW := ADDRESS\n"); |
| 34 | } |
| 35 | |
| 36 | static void |
| 37 | usage(void) |
| 38 | { |
| 39 | explain(); |
| 40 | exit(-1); |
| 41 | } |
| 42 | |
| 43 | static int |
Stephen Hemminger | 32a121c | 2016-03-21 11:48:36 -0700 | [diff] [blame] | 44 | parse_nat_args(int *argc_p, char ***argv_p, struct tc_nat *sel) |
Herbert Xu | fc2d020 | 2007-10-12 17:08:40 +0800 | [diff] [blame] | 45 | { |
| 46 | int argc = *argc_p; |
| 47 | char **argv = *argv_p; |
| 48 | inet_prefix addr; |
| 49 | |
| 50 | if (argc <= 0) |
| 51 | return -1; |
| 52 | |
| 53 | if (matches(*argv, "egress") == 0) |
| 54 | sel->flags |= TCA_NAT_FLAG_EGRESS; |
| 55 | else if (matches(*argv, "ingress") != 0) |
| 56 | goto bad_val; |
| 57 | |
| 58 | NEXT_ARG(); |
| 59 | |
| 60 | if (get_prefix_1(&addr, *argv, AF_INET)) |
| 61 | goto bad_val; |
| 62 | |
| 63 | sel->old_addr = addr.data[0]; |
| 64 | sel->mask = htonl(~0u << (32 - addr.bitlen)); |
| 65 | |
| 66 | NEXT_ARG(); |
| 67 | |
| 68 | if (get_prefix_1(&addr, *argv, AF_INET)) |
| 69 | goto bad_val; |
| 70 | |
| 71 | sel->new_addr = addr.data[0]; |
| 72 | |
| 73 | argc--; |
| 74 | argv++; |
| 75 | |
| 76 | *argc_p = argc; |
| 77 | *argv_p = argv; |
| 78 | return 0; |
| 79 | |
| 80 | bad_val: |
| 81 | return -1; |
| 82 | } |
| 83 | |
| 84 | static int |
| 85 | parse_nat(struct action_util *a, int *argc_p, char ***argv_p, int tca_id, struct nlmsghdr *n) |
| 86 | { |
Phil Sutter | d17b136 | 2016-07-18 16:48:42 +0200 | [diff] [blame] | 87 | struct tc_nat sel = {}; |
Herbert Xu | fc2d020 | 2007-10-12 17:08:40 +0800 | [diff] [blame] | 88 | |
| 89 | int argc = *argc_p; |
| 90 | char **argv = *argv_p; |
| 91 | int ok = 0; |
| 92 | struct rtattr *tail; |
| 93 | |
Herbert Xu | fc2d020 | 2007-10-12 17:08:40 +0800 | [diff] [blame] | 94 | while (argc > 0) { |
| 95 | if (matches(*argv, "nat") == 0) { |
| 96 | NEXT_ARG(); |
| 97 | if (parse_nat_args(&argc, &argv, &sel)) { |
Stephen Hemminger | 32a121c | 2016-03-21 11:48:36 -0700 | [diff] [blame] | 98 | fprintf(stderr, "Illegal nat construct (%s)\n", |
Herbert Xu | fc2d020 | 2007-10-12 17:08:40 +0800 | [diff] [blame] | 99 | *argv); |
| 100 | explain(); |
| 101 | return -1; |
| 102 | } |
| 103 | ok++; |
| 104 | continue; |
| 105 | } else if (matches(*argv, "help") == 0) { |
| 106 | usage(); |
| 107 | } else { |
| 108 | break; |
| 109 | } |
| 110 | |
| 111 | } |
| 112 | |
| 113 | if (!ok) { |
| 114 | explain(); |
| 115 | return -1; |
| 116 | } |
| 117 | |
Phil Sutter | 69f5aff | 2016-07-23 13:28:09 +0200 | [diff] [blame] | 118 | if (argc && !action_a2n(*argv, &sel.action, false)) |
| 119 | NEXT_ARG_FWD(); |
Herbert Xu | fc2d020 | 2007-10-12 17:08:40 +0800 | [diff] [blame] | 120 | |
| 121 | if (argc) { |
| 122 | if (matches(*argv, "index") == 0) { |
| 123 | NEXT_ARG(); |
| 124 | if (get_u32(&sel.index, *argv, 10)) { |
Jamal Hadi Salim | e26520e | 2013-09-29 07:39:23 -0400 | [diff] [blame] | 125 | fprintf(stderr, "Nat: Illegal \"index\"\n"); |
Herbert Xu | fc2d020 | 2007-10-12 17:08:40 +0800 | [diff] [blame] | 126 | return -1; |
| 127 | } |
| 128 | argc--; |
| 129 | argv++; |
| 130 | } |
| 131 | } |
| 132 | |
| 133 | tail = NLMSG_TAIL(n); |
| 134 | addattr_l(n, MAX_MSG, tca_id, NULL, 0); |
| 135 | addattr_l(n, MAX_MSG, TCA_NAT_PARMS, &sel, sizeof(sel)); |
| 136 | tail->rta_len = (char *)NLMSG_TAIL(n) - (char *)tail; |
| 137 | |
| 138 | *argc_p = argc; |
| 139 | *argv_p = argv; |
| 140 | return 0; |
| 141 | } |
| 142 | |
| 143 | static int |
Stephen Hemminger | 32a121c | 2016-03-21 11:48:36 -0700 | [diff] [blame] | 144 | print_nat(struct action_util *au, FILE * f, struct rtattr *arg) |
Herbert Xu | fc2d020 | 2007-10-12 17:08:40 +0800 | [diff] [blame] | 145 | { |
| 146 | struct tc_nat *sel; |
| 147 | struct rtattr *tb[TCA_NAT_MAX + 1]; |
| 148 | char buf1[256]; |
| 149 | char buf2[256]; |
Stephen Hemminger | 32a121c | 2016-03-21 11:48:36 -0700 | [diff] [blame] | 150 | |
Herbert Xu | fc2d020 | 2007-10-12 17:08:40 +0800 | [diff] [blame] | 151 | int len; |
| 152 | |
| 153 | if (arg == NULL) |
| 154 | return -1; |
| 155 | |
| 156 | parse_rtattr_nested(tb, TCA_NAT_MAX, arg); |
| 157 | |
| 158 | if (tb[TCA_NAT_PARMS] == NULL) { |
| 159 | fprintf(f, "[NULL nat parameters]"); |
| 160 | return -1; |
| 161 | } |
| 162 | sel = RTA_DATA(tb[TCA_NAT_PARMS]); |
| 163 | |
| 164 | len = ffs(sel->mask); |
| 165 | len = len ? 33 - len : 0; |
| 166 | |
| 167 | fprintf(f, " nat %s %s/%d %s %s", sel->flags & TCA_NAT_FLAG_EGRESS ? |
| 168 | "egress" : "ingress", |
Phil Sutter | a418e45 | 2016-03-22 19:35:15 +0100 | [diff] [blame] | 169 | format_host_r(AF_INET, 4, &sel->old_addr, buf1, sizeof(buf1)), |
Herbert Xu | fc2d020 | 2007-10-12 17:08:40 +0800 | [diff] [blame] | 170 | len, |
Phil Sutter | a418e45 | 2016-03-22 19:35:15 +0100 | [diff] [blame] | 171 | format_host_r(AF_INET, 4, &sel->new_addr, buf2, sizeof(buf2)), |
Phil Sutter | 7093200 | 2016-07-23 13:28:10 +0200 | [diff] [blame] | 172 | action_n2a(sel->action)); |
Herbert Xu | fc2d020 | 2007-10-12 17:08:40 +0800 | [diff] [blame] | 173 | |
| 174 | if (show_stats) { |
| 175 | if (tb[TCA_NAT_TM]) { |
| 176 | struct tcf_t *tm = RTA_DATA(tb[TCA_NAT_TM]); |
Stephen Hemminger | 32a121c | 2016-03-21 11:48:36 -0700 | [diff] [blame] | 177 | |
| 178 | print_tm(f, tm); |
Herbert Xu | fc2d020 | 2007-10-12 17:08:40 +0800 | [diff] [blame] | 179 | } |
| 180 | } |
| 181 | |
| 182 | return 0; |
| 183 | } |
| 184 | |
| 185 | struct action_util nat_action_util = { |
| 186 | .id = "nat", |
| 187 | .parse_aopt = parse_nat, |
| 188 | .print_aopt = print_nat, |
| 189 | }; |