diff options
Diffstat (limited to 'extensions/libct_proto_gre.c')
| -rw-r--r-- | extensions/libct_proto_gre.c | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/extensions/libct_proto_gre.c b/extensions/libct_proto_gre.c new file mode 100644 index 0000000..0274a37 --- /dev/null +++ b/extensions/libct_proto_gre.c @@ -0,0 +1,192 @@ +/* + * (C) 2009 by Pablo Neira Ayuso <pablo@netfilter.org> + * + * 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. + * + */ +#include <stdio.h> +#include <getopt.h> +#include <stdlib.h> +#include <netinet/in.h> /* For htons */ +#include <libnetfilter_conntrack/libnetfilter_conntrack.h> + +#include "conntrack.h" + +enum { + CT_GRE_ORIG_SKEY = (1 << 0), + CT_GRE_ORIG_DKEY = (1 << 1), + CT_GRE_REPL_SKEY = (1 << 2), + CT_GRE_REPL_DKEY = (1 << 3), + CT_GRE_MASK_SKEY = (1 << 4), + CT_GRE_MASK_DKEY = (1 << 5), + CT_GRE_EXPTUPLE_SKEY = (1 << 6), + CT_GRE_EXPTUPLE_DKEY = (1 << 7) +}; + +#define GRE_OPT_MAX 11 +static struct option opts[GRE_OPT_MAX] = { + { "orig-key-src", .has_arg = 1, .val = '1' }, + { "srckey", .has_arg = 1, .val = '1' }, + { "orig-key-dst", .has_arg = 1, .val = '2' }, + { "dstkey", .has_arg = 1, .val = '2' }, + { "reply-key-src", .has_arg = 1, .val = '3' }, + { "reply-key-dst", .has_arg = 1, .val = '4' }, + { "mask-key-src", .has_arg = 1, .val = '5' }, + { "mask-key-dst", .has_arg = 1, .val = '6' }, + { "tuple-key-src", .has_arg = 1, .val = '7' }, + { "tuple-key-dst", .has_arg = 1, .val = '8' }, + {0, 0, 0, 0} +}; + +static const char *gre_optflags[GRE_OPT_MAX] = { + [0] = "srckey", + [1] = "dstkey", + [2] = "reply-key-src", + [3] = "reply-key-dst", + [4] = "mask-key-src", + [5] = "mask-key-dst", + [6] = "tuple-key-src", + [7] = "tuple-key-dst" +}; + +static void help(void) +{ + fprintf(stdout, " --orig-key-src\t\toriginal source key\n"); + fprintf(stdout, " --orig-key-dst\t\toriginal destination key\n"); + fprintf(stdout, " --reply-key-src\t\treply source key\n"); + fprintf(stdout, " --reply-key-dst\t\treply destination key\n"); + fprintf(stdout, " --mask-key-src\t\tmask source key\n"); + fprintf(stdout, " --mask-key-dst\t\tmask destination key\n"); + fprintf(stdout, " --tuple-key-src\t\texpectation tuple src key\n"); + fprintf(stdout, " --tuple-key-src\t\texpectation tuple dst key\n"); +} + +static char gre_commands_v_options[NUMBER_OF_CMD][GRE_OPT_MAX] = +{ + /* 1 2 3 4 5 6 7 8 */ +/*CT_LIST*/ {2,2,2,2,0,0,0,0}, +/*CT_CREATE*/ {3,3,3,3,0,0,0,0}, +/*CT_UPDATE*/ {2,2,2,2,0,0,0,0}, +/*CT_DELETE*/ {2,2,2,2,0,0,0,0}, +/*CT_GET*/ {3,3,3,3,0,0,0,0}, +/*CT_FLUSH*/ {0,0,0,0,0,0,0,0}, +/*CT_EVENT*/ {2,2,2,2,0,0,0,0}, +/*CT_VERSION*/ {0,0,0,0,0,0,0,0}, +/*CT_HELP*/ {0,0,0,0,0,0,0,0}, +/*EXP_LIST*/ {0,0,0,0,0,0,0,0}, +/*EXP_CREATE*/ {1,1,1,1,1,1,1,1}, +/*EXP_DELETE*/ {1,1,1,1,0,0,0,0}, +/*EXP_GET*/ {1,1,1,1,0,0,0,0}, +/*EXP_FLUSH*/ {0,0,0,0,0,0,0,0}, +/*EXP_EVENT*/ {0,0,0,0,0,0,0,0}, +}; + +static int parse_options(char c, + struct nf_conntrack *ct, + struct nf_conntrack *exptuple, + struct nf_conntrack *mask, + unsigned int *flags) +{ + switch(c) { + u_int16_t port; + case '1': + port = htons(strtoul(optarg, NULL, 0)); + nfct_set_attr_u16(ct, ATTR_ORIG_PORT_SRC, port); + nfct_set_attr_u8(ct, ATTR_ORIG_L4PROTO, IPPROTO_GRE); + *flags |= CT_GRE_ORIG_SKEY; + break; + case '2': + port = htons(strtoul(optarg, NULL, 0)); + nfct_set_attr_u16(ct, ATTR_ORIG_PORT_DST, port); + nfct_set_attr_u8(ct, ATTR_ORIG_L4PROTO, IPPROTO_GRE); + *flags |= CT_GRE_ORIG_DKEY; + break; + case '3': + port = htons(strtoul(optarg, NULL, 0)); + nfct_set_attr_u16(ct, ATTR_REPL_PORT_SRC, port); + nfct_set_attr_u8(ct, ATTR_REPL_L4PROTO, IPPROTO_GRE); + *flags |= CT_GRE_REPL_SKEY; + break; + case '4': + port = htons(strtoul(optarg, NULL, 0)); + nfct_set_attr_u16(ct, ATTR_REPL_PORT_DST, port); + nfct_set_attr_u8(ct, ATTR_REPL_L4PROTO, IPPROTO_GRE); + *flags |= CT_GRE_REPL_DKEY; + break; + case '5': + port = htons(strtoul(optarg, NULL, 0)); + nfct_set_attr_u16(mask, ATTR_ORIG_PORT_SRC, port); + nfct_set_attr_u8(mask, ATTR_ORIG_L4PROTO, IPPROTO_GRE); + *flags |= CT_GRE_MASK_SKEY; + break; + case '6': + port = htons(strtoul(optarg, NULL, 0)); + nfct_set_attr_u16(mask, ATTR_ORIG_PORT_DST, port); + nfct_set_attr_u8(mask, ATTR_ORIG_L4PROTO, IPPROTO_GRE); + *flags |= CT_GRE_MASK_DKEY; + break; + case '7': + port = htons(strtoul(optarg, NULL, 0)); + nfct_set_attr_u16(exptuple, ATTR_ORIG_PORT_SRC, port); + nfct_set_attr_u8(exptuple, ATTR_ORIG_L4PROTO, IPPROTO_GRE); + *flags |= CT_GRE_EXPTUPLE_SKEY; + break; + case '8': + port = htons(strtoul(optarg, NULL, 0)); + nfct_set_attr_u16(exptuple, ATTR_ORIG_PORT_DST, port); + nfct_set_attr_u8(exptuple, ATTR_ORIG_L4PROTO, IPPROTO_GRE); + *flags |= CT_GRE_EXPTUPLE_DKEY; + break; + } + return 1; +} + +#define GRE_VALID_FLAGS_MAX 2 +static unsigned int gre_valid_flags[GRE_VALID_FLAGS_MAX] = { + CT_GRE_ORIG_SKEY | CT_GRE_ORIG_DKEY, + CT_GRE_REPL_SKEY | CT_GRE_REPL_DKEY, +}; + +static void final_check(unsigned int flags, + unsigned int cmd, + struct nf_conntrack *ct) +{ + int ret, partial; + + ret = generic_opt_check(flags, GRE_OPT_MAX, + gre_commands_v_options[cmd], gre_optflags, + gre_valid_flags, GRE_VALID_FLAGS_MAX, &partial); + if (!ret) { + switch(partial) { + case -1: + case 0: + exit_error(PARAMETER_PROBLEM, "you have to specify " + "`--srckey' and " + "`--dstkey'"); + break; + case 1: + exit_error(PARAMETER_PROBLEM, "you have to specify " + "`--reply-src-key' and " + "`--reply-dst-key'"); + break; + } + } +} + +static struct ctproto_handler gre = { + .name = "gre", + .protonum = IPPROTO_GRE, + .parse_opts = parse_options, + .final_check = final_check, + .help = help, + .opts = opts, + .version = VERSION, +}; + +void register_gre(void) +{ + register_proto(&gre); +} |