diff options
Diffstat (limited to 'extensions/libct_proto_dccp.c')
| -rw-r--r-- | extensions/libct_proto_dccp.c | 246 |
1 files changed, 246 insertions, 0 deletions
diff --git a/extensions/libct_proto_dccp.c b/extensions/libct_proto_dccp.c new file mode 100644 index 0000000..586c4cc --- /dev/null +++ b/extensions/libct_proto_dccp.c @@ -0,0 +1,246 @@ +/* + * (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 <string.h> +#include <netinet/in.h> /* For htons */ +#include <libnetfilter_conntrack/libnetfilter_conntrack.h> +#include <libnetfilter_conntrack/libnetfilter_conntrack_dccp.h> + +#include "conntrack.h" + +#ifndef IPPROTO_DCCP +#define IPPROTO_DCCP 33 +#endif + +enum { + CT_DCCP_ORIG_SPORT = (1 << 0), + CT_DCCP_ORIG_DPORT = (1 << 1), + CT_DCCP_REPL_SPORT = (1 << 2), + CT_DCCP_REPL_DPORT = (1 << 3), + CT_DCCP_MASK_SPORT = (1 << 4), + CT_DCCP_MASK_DPORT = (1 << 5), + CT_DCCP_STATE = (1 << 6), + CT_DCCP_EXPTUPLE_SPORT = (1 << 7), + CT_DCCP_EXPTUPLE_DPORT = (1 << 8), + CT_DCCP_ROLE = (1 << 9), +}; + +#define DCCP_OPT_MAX 13 +static struct option opts[DCCP_OPT_MAX] = { + { .name = "orig-port-src", .has_arg = 1, .val = 1 }, + { .name = "orig-port-dst", .has_arg = 1, .val = 2 }, + { .name = "reply-port-src", .has_arg = 1, .val = 3 }, + { .name = "reply-port-dst", .has_arg = 1, .val = 4 }, + { .name = "mask-port-src", .has_arg = 1, .val = 5 }, + { .name = "mask-port-dst", .has_arg = 1, .val = 6 }, + { .name = "state", .has_arg = 1, .val = 7 }, + { .name = "tuple-port-src", .has_arg = 1, .val = 8 }, + { .name = "tuple-port-dst", .has_arg = 1, .val = 9 }, + { .name = "sport", .has_arg = 1, .val = 1 }, /* alias */ + { .name = "dport", .has_arg = 1, .val = 2 }, /* alias */ + { .name = "role", .has_arg = 1, .val = 10 }, + { 0, 0, 0, 0}, +}; + +static const char *dccp_optflags[DCCP_OPT_MAX] = { + [0] = "sport", + [1] = "dport", + [2] = "reply-port-src", + [3] = "reply-port-dst", + [4] = "mask-port-src", + [5] = "mask-port-dst", + [6] = "state", + [7] = "tuple-port-src", + [8] = "tuple-port-dst", + [9] = "role" +}; + +static char dccp_commands_v_options[NUMBER_OF_CMD][DCCP_OPT_MAX] = +/* Well, it's better than "Re: Sevilla vs Betis" */ +{ + /* 1 2 3 4 5 6 7 8 9 10*/ +/*CT_LIST*/ {2,2,2,2,0,0,2,0,0,0}, +/*CT_CREATE*/ {3,3,3,3,0,0,1,0,0,1}, +/*CT_UPDATE*/ {2,2,2,2,0,0,2,0,0,0}, +/*CT_DELETE*/ {2,2,2,2,0,0,2,0,0,0}, +/*CT_GET*/ {3,3,3,3,0,0,2,0,0,0}, +/*CT_FLUSH*/ {0,0,0,0,0,0,0,0,0,0}, +/*CT_EVENT*/ {2,2,2,2,0,0,2,0,0,0}, +/*CT_VERSION*/ {0,0,0,0,0,0,0,0,0,0}, +/*CT_HELP*/ {0,0,0,0,0,0,0,0,0,0}, +/*EXP_LIST*/ {0,0,0,0,0,0,0,0,0,0}, +/*EXP_CREATE*/ {1,1,1,1,1,1,0,1,1,1}, +/*EXP_DELETE*/ {1,1,1,1,0,0,0,0,0,0}, +/*EXP_GET*/ {1,1,1,1,0,0,0,0,0,0}, +/*EXP_FLUSH*/ {0,0,0,0,0,0,0,0,0,0}, +/*EXP_EVENT*/ {0,0,0,0,0,0,0,0,0,0}, +}; + +static const char *dccp_states[DCCP_CONNTRACK_MAX] = { + [DCCP_CONNTRACK_NONE] = "NONE", + [DCCP_CONNTRACK_REQUEST] = "REQUEST", + [DCCP_CONNTRACK_RESPOND] = "RESPOND", + [DCCP_CONNTRACK_PARTOPEN] = "PARTOPEN", + [DCCP_CONNTRACK_OPEN] = "OPEN", + [DCCP_CONNTRACK_CLOSEREQ] = "CLOSEREQ", + [DCCP_CONNTRACK_CLOSING] = "CLOSING", + [DCCP_CONNTRACK_TIMEWAIT] = "TIMEWAIT", + [DCCP_CONNTRACK_IGNORE] = "IGNORE", + [DCCP_CONNTRACK_INVALID] = "INVALID", +}; + +static void help(void) +{ + fprintf(stdout, " --orig-port-src\t\toriginal source port\n"); + fprintf(stdout, " --orig-port-dst\t\toriginal destination port\n"); + fprintf(stdout, " --reply-port-src\t\treply source port\n"); + fprintf(stdout, " --reply-port-dst\t\treply destination port\n"); + fprintf(stdout, " --mask-port-src\t\tmask source port\n"); + fprintf(stdout, " --mask-port-dst\t\tmask destination port\n"); + fprintf(stdout, " --tuple-port-src\t\texpectation tuple src port\n"); + fprintf(stdout, " --tuple-port-src\t\texpectation tuple dst port\n"); + fprintf(stdout, " --state\t\t\tDCCP state, fe. RESPOND\n"); +} + +static int parse_options(char c, + struct nf_conntrack *ct, + struct nf_conntrack *exptuple, + struct nf_conntrack *mask, + unsigned int *flags) +{ + int i; + u_int16_t port; + + switch(c) { + case 1: + port = htons(atoi(optarg)); + nfct_set_attr_u16(ct, ATTR_ORIG_PORT_SRC, port); + nfct_set_attr_u8(ct, ATTR_ORIG_L4PROTO, IPPROTO_DCCP); + *flags |= CT_DCCP_ORIG_SPORT; + break; + case 2: + port = htons(atoi(optarg)); + nfct_set_attr_u16(ct, ATTR_ORIG_PORT_DST, port); + nfct_set_attr_u8(ct, ATTR_ORIG_L4PROTO, IPPROTO_DCCP); + *flags |= CT_DCCP_ORIG_DPORT; + break; + case 3: + port = htons(atoi(optarg)); + nfct_set_attr_u16(ct, ATTR_REPL_PORT_SRC, port); + nfct_set_attr_u8(ct, ATTR_REPL_L4PROTO, IPPROTO_DCCP); + *flags |= CT_DCCP_REPL_SPORT; + break; + case 4: + port = htons(atoi(optarg)); + nfct_set_attr_u16(ct, ATTR_REPL_PORT_DST, port); + nfct_set_attr_u8(ct, ATTR_REPL_L4PROTO, IPPROTO_DCCP); + *flags |= CT_DCCP_REPL_DPORT; + break; + case 5: + port = htons(atoi(optarg)); + nfct_set_attr_u16(mask, ATTR_ORIG_PORT_SRC, port); + nfct_set_attr_u8(mask, ATTR_ORIG_L4PROTO, IPPROTO_DCCP); + *flags |= CT_DCCP_MASK_SPORT; + break; + case 6: + port = htons(atoi(optarg)); + nfct_set_attr_u16(mask, ATTR_ORIG_PORT_DST, port); + nfct_set_attr_u8(mask, ATTR_ORIG_L4PROTO, IPPROTO_DCCP); + *flags |= CT_DCCP_MASK_DPORT; + break; + case 7: + for (i=0; i<DCCP_CONNTRACK_MAX; i++) { + if (strcmp(optarg, dccp_states[i]) == 0) { + nfct_set_attr_u8(ct, ATTR_DCCP_STATE, i); + break; + } + } + if (i == DCCP_CONNTRACK_MAX) + exit_error(PARAMETER_PROBLEM, + "Unknown DCCP state `%s'", optarg); + *flags |= CT_DCCP_STATE; + break; + case 8: + port = htons(atoi(optarg)); + nfct_set_attr_u16(exptuple, ATTR_ORIG_PORT_SRC, port); + nfct_set_attr_u8(exptuple, ATTR_ORIG_L4PROTO, port); + *flags |= CT_DCCP_EXPTUPLE_SPORT; + break; + case 9: + port = htons(atoi(optarg)); + nfct_set_attr_u16(exptuple, ATTR_ORIG_PORT_DST, port); + nfct_set_attr_u8(exptuple, ATTR_ORIG_L4PROTO, port); + *flags |= CT_DCCP_EXPTUPLE_DPORT; + break; + case 10: + if (strncasecmp(optarg, "client", strlen(optarg)) == 0) { + nfct_set_attr_u8(ct, ATTR_DCCP_ROLE, + DCCP_CONNTRACK_ROLE_CLIENT); + } else if (strncasecmp(optarg, "server", strlen(optarg)) == 0) { + nfct_set_attr_u8(ct, ATTR_DCCP_ROLE, + DCCP_CONNTRACK_ROLE_SERVER); + } else { + exit_error(PARAMETER_PROBLEM, + "Unknown DCCP role `%s'", optarg); + } + *flags |= CT_DCCP_ROLE; + break; + } + return 1; +} + +#define DCCP_VALID_FLAGS_MAX 2 +static unsigned int dccp_valid_flags[DCCP_VALID_FLAGS_MAX] = { + CT_DCCP_ORIG_SPORT | CT_DCCP_ORIG_DPORT, + CT_DCCP_REPL_SPORT | CT_DCCP_REPL_DPORT +}; + +static void +final_check(unsigned int flags, unsigned int cmd, struct nf_conntrack *ct) +{ + int ret, partial; + + ret = generic_opt_check(flags, DCCP_OPT_MAX, + dccp_commands_v_options[cmd], dccp_optflags, + dccp_valid_flags, DCCP_VALID_FLAGS_MAX, + &partial); + if (!ret) { + switch(partial) { + case -1: + case 0: + exit_error(PARAMETER_PROBLEM, "you have to specify " + "`--sport' and " + "`--dport'"); + break; + case 1: + exit_error(PARAMETER_PROBLEM, "you have to specify " + "`--reply-port-src' and " + "`--report-port-dst'"); + break; + } + } +} + +static struct ctproto_handler dccp = { + .name = "dccp", + .protonum = IPPROTO_DCCP, + .parse_opts = parse_options, + .final_check = final_check, + .help = help, + .opts = opts, + .version = VERSION, +}; + +void register_dccp(void) +{ + register_proto(&dccp); +} |