diff options
Diffstat (limited to 'src/ipset_iphash.c')
| -rw-r--r-- | src/ipset_iphash.c | 279 |
1 files changed, 279 insertions, 0 deletions
diff --git a/src/ipset_iphash.c b/src/ipset_iphash.c new file mode 100644 index 0000000..0bc5bd1 --- /dev/null +++ b/src/ipset_iphash.c @@ -0,0 +1,279 @@ +/* Copyright 2004 Jozsef Kadlecsik (kadlec@blackhole.kfki.hu) + * + * 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. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <limits.h> /* UINT_MAX */ +#include <stdio.h> /* *printf */ +#include <string.h> /* mem* */ + +#include "ipset.h" + +#include <linux/netfilter_ipv4/ip_set_iphash.h> + +#define BUFLEN 30; + +#define OPT_CREATE_HASHSIZE 0x01U +#define OPT_CREATE_PROBES 0x02U +#define OPT_CREATE_RESIZE 0x04U +#define OPT_CREATE_NETMASK 0x08U + +/* Initialize the create. */ +static void +iphash_create_init(void *data) +{ + struct ip_set_req_iphash_create *mydata = data; + + DP("create INIT"); + + /* Default create parameters */ + mydata->hashsize = 1024; + mydata->probes = 8; + mydata->resize = 50; + + mydata->netmask = 0xFFFFFFFF; +} + +/* Function which parses command options; returns true if it ate an option */ +static int +iphash_create_parse(int c, char *argv[] UNUSED, void *data, unsigned *flags) +{ + struct ip_set_req_iphash_create *mydata = + (struct ip_set_req_iphash_create *) data; + unsigned int bits; + ip_set_ip_t value; + + DP("create_parse"); + + switch (c) { + case '1': + + if (string_to_number(optarg, 1, UINT_MAX - 1, &mydata->hashsize)) + exit_error(PARAMETER_PROBLEM, "Invalid hashsize `%s' specified", optarg); + + *flags |= OPT_CREATE_HASHSIZE; + + DP("--hashsize %u", mydata->hashsize); + + break; + + case '2': + + if (string_to_number(optarg, 1, 65535, &value)) + exit_error(PARAMETER_PROBLEM, "Invalid probes `%s' specified", optarg); + + mydata->probes = value; + *flags |= OPT_CREATE_PROBES; + + DP("--probes %u", mydata->probes); + + break; + + case '3': + + if (string_to_number(optarg, 0, 65535, &value)) + exit_error(PARAMETER_PROBLEM, "Invalid resize `%s' specified", optarg); + + mydata->resize = value; + *flags |= OPT_CREATE_RESIZE; + + DP("--resize %u", mydata->resize); + + break; + + case '4': + + if (string_to_number(optarg, 0, 32, &bits)) + exit_error(PARAMETER_PROBLEM, + "Invalid netmask `%s' specified", optarg); + + if (bits != 0) + mydata->netmask = 0xFFFFFFFF << (32 - bits); + + *flags |= OPT_CREATE_NETMASK; + + DP("--netmask %x", mydata->netmask); + + break; + + default: + return 0; + } + + return 1; +} + +/* Final check; exit if not ok. */ +static void +iphash_create_final(void *data UNUSED, unsigned int flags UNUSED) +{ +} + +/* Create commandline options */ +static const struct option create_opts[] = { + {.name = "hashsize", .has_arg = required_argument, .val = '1'}, + {.name = "probes", .has_arg = required_argument, .val = '2'}, + {.name = "resize", .has_arg = required_argument, .val = '3'}, + {.name = "netmask", .has_arg = required_argument, .val = '4'}, + {NULL}, +}; + +/* Add, del, test parser */ +static ip_set_ip_t +iphash_adt_parser(int cmd UNUSED, const char *arg, void *data) +{ + struct ip_set_req_iphash *mydata = data; + + parse_ip(arg, &mydata->ip); + if (!mydata->ip) + exit_error(PARAMETER_PROBLEM, + "Zero valued IP address `%s' specified", arg); + + return mydata->ip; +}; + +/* + * Print and save + */ + +static void +iphash_initheader(struct set *set, const void *data) +{ + const struct ip_set_req_iphash_create *header = data; + struct ip_set_iphash *map = set->settype->header; + + memset(map, 0, sizeof(struct ip_set_iphash)); + map->hashsize = header->hashsize; + map->probes = header->probes; + map->resize = header->resize; + map->netmask = header->netmask; +} + +static unsigned int +mask_to_bits(ip_set_ip_t mask) +{ + unsigned int bits = 32; + ip_set_ip_t maskaddr; + + if (mask == 0xFFFFFFFF) + return bits; + + maskaddr = 0xFFFFFFFE; + while (--bits > 0 && maskaddr != mask) + maskaddr <<= 1; + + return bits; +} + +static void +iphash_printheader(struct set *set, unsigned options UNUSED) +{ + struct ip_set_iphash *mysetdata = set->settype->header; + + printf(" hashsize: %u", mysetdata->hashsize); + printf(" probes: %u", mysetdata->probes); + printf(" resize: %u", mysetdata->resize); + if (mysetdata->netmask == 0xFFFFFFFF) + printf("\n"); + else + printf(" netmask: %d\n", mask_to_bits(mysetdata->netmask)); +} + +static void +iphash_printips(struct set *set UNUSED, void *data, u_int32_t len, + unsigned options, char dont_align) +{ + size_t offset = 0; + ip_set_ip_t *ip; + + while (offset < len) { + ip = data + offset; + printf("%s\n", ip_tostring(*ip, options)); + offset += IPSET_VALIGN(sizeof(ip_set_ip_t), dont_align); + } +} + +static void +iphash_saveheader(struct set *set, unsigned options UNUSED) +{ + struct ip_set_iphash *mysetdata = set->settype->header; + + printf("-N %s %s --hashsize %u --probes %u --resize %u", + set->name, set->settype->typename, + mysetdata->hashsize, mysetdata->probes, mysetdata->resize); + if (mysetdata->netmask == 0xFFFFFFFF) + printf("\n"); + else + printf(" --netmask %d\n", mask_to_bits(mysetdata->netmask)); +} + +/* Print save for an IP */ +static void +iphash_saveips(struct set *set UNUSED, void *data, u_int32_t len, + unsigned options, char dont_align) +{ + size_t offset = 0; + ip_set_ip_t *ip; + + while (offset < len) { + ip = data + offset; + printf("-A %s %s\n", set->name, ip_tostring(*ip, options)); + offset += IPSET_VALIGN(sizeof(ip_set_ip_t), dont_align); + } +} + +static void +iphash_usage(void) +{ + printf + ("-N set iphash [--hashsize hashsize] [--probes probes ]\n" + " [--resize resize] [--netmask CIDR-netmask]\n" + "-A set IP\n" + "-D set IP\n" + "-T set IP\n"); +} + +static struct settype settype_iphash = { + .typename = SETTYPE_NAME, + .protocol_version = IP_SET_PROTOCOL_VERSION, + + /* Create */ + .create_size = sizeof(struct ip_set_req_iphash_create), + .create_init = iphash_create_init, + .create_parse = iphash_create_parse, + .create_final = iphash_create_final, + .create_opts = create_opts, + + /* Add/del/test */ + .adt_size = sizeof(struct ip_set_req_iphash), + .adt_parser = iphash_adt_parser, + + /* Printing */ + .header_size = sizeof(struct ip_set_iphash), + .initheader = iphash_initheader, + .printheader = iphash_printheader, + .printips = iphash_printips, + .printips_sorted = iphash_printips, + .saveheader = iphash_saveheader, + .saveips = iphash_saveips, + + .usage = iphash_usage, +}; + +CONSTRUCTOR(iphash) +{ + settype_register(&settype_iphash); + +} |