| /* |
| * (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*/ {1,1,0,0,1,1,0,1,1,1}, |
| /*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; |
| uint16_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); |
| } |