9073e1a804
Pull trivial tree updates from Jiri Kosina: "Usual earth-shaking, news-breaking, rocket science pile from trivial.git" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (23 commits) doc: usb: Fix typo in Documentation/usb/gadget_configs.txt doc: add missing files to timers/00-INDEX timekeeping: Fix some trivial typos in comments mm: Fix some trivial typos in comments irq: Fix some trivial typos in comments NUMA: fix typos in Kconfig help text mm: update 00-INDEX doc: Documentation/DMA-attributes.txt fix typo DRM: comment: `halve' -> `half' Docs: Kconfig: `devlopers' -> `developers' doc: typo on word accounting in kprobes.c in mutliple architectures treewide: fix "usefull" typo treewide: fix "distingush" typo mm/Kconfig: Grammar s/an/a/ kexec: Typo s/the/then/ Documentation/kvm: Update cpuid documentation for steal time and pv eoi treewide: Fix common typo in "identify" __page_to_pfn: Fix typo in comment Correct some typos for word frequency clk: fixed-factor: Fix a trivial typo ...
524 lines
14 KiB
C
524 lines
14 KiB
C
/* Copyright (C) 2000-2002 Joakim Axelsson <gozem@linux.nu>
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* Patrick Schaaf <bof@bof.de>
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* Martin Josefsson <gandalf@wlug.westbo.se>
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* Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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/* Kernel module which implements the set match and SET target
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* for netfilter/iptables. */
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/netfilter/x_tables.h>
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#include <linux/netfilter/xt_set.h>
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#include <linux/netfilter/ipset/ip_set_timeout.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
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MODULE_DESCRIPTION("Xtables: IP set match and target module");
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MODULE_ALIAS("xt_SET");
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MODULE_ALIAS("ipt_set");
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MODULE_ALIAS("ip6t_set");
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MODULE_ALIAS("ipt_SET");
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MODULE_ALIAS("ip6t_SET");
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static inline int
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match_set(ip_set_id_t index, const struct sk_buff *skb,
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const struct xt_action_param *par,
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struct ip_set_adt_opt *opt, int inv)
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{
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if (ip_set_test(index, skb, par, opt))
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inv = !inv;
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return inv;
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}
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#define ADT_OPT(n, f, d, fs, cfs, t) \
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struct ip_set_adt_opt n = { \
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.family = f, \
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.dim = d, \
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.flags = fs, \
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.cmdflags = cfs, \
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.ext.timeout = t, \
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}
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/* Revision 0 interface: backward compatible with netfilter/iptables */
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static bool
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set_match_v0(const struct sk_buff *skb, struct xt_action_param *par)
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{
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const struct xt_set_info_match_v0 *info = par->matchinfo;
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ADT_OPT(opt, par->family, info->match_set.u.compat.dim,
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info->match_set.u.compat.flags, 0, UINT_MAX);
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return match_set(info->match_set.index, skb, par, &opt,
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info->match_set.u.compat.flags & IPSET_INV_MATCH);
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}
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static void
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compat_flags(struct xt_set_info_v0 *info)
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{
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u_int8_t i;
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/* Fill out compatibility data according to enum ip_set_kopt */
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info->u.compat.dim = IPSET_DIM_ZERO;
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if (info->u.flags[0] & IPSET_MATCH_INV)
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info->u.compat.flags |= IPSET_INV_MATCH;
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for (i = 0; i < IPSET_DIM_MAX-1 && info->u.flags[i]; i++) {
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info->u.compat.dim++;
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if (info->u.flags[i] & IPSET_SRC)
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info->u.compat.flags |= (1<<info->u.compat.dim);
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}
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}
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static int
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set_match_v0_checkentry(const struct xt_mtchk_param *par)
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{
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struct xt_set_info_match_v0 *info = par->matchinfo;
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ip_set_id_t index;
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index = ip_set_nfnl_get_byindex(par->net, info->match_set.index);
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if (index == IPSET_INVALID_ID) {
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pr_warning("Cannot find set identified by id %u to match\n",
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info->match_set.index);
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return -ENOENT;
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}
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if (info->match_set.u.flags[IPSET_DIM_MAX-1] != 0) {
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pr_warning("Protocol error: set match dimension "
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"is over the limit!\n");
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ip_set_nfnl_put(par->net, info->match_set.index);
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return -ERANGE;
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}
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/* Fill out compatibility data */
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compat_flags(&info->match_set);
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return 0;
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}
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static void
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set_match_v0_destroy(const struct xt_mtdtor_param *par)
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{
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struct xt_set_info_match_v0 *info = par->matchinfo;
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ip_set_nfnl_put(par->net, info->match_set.index);
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}
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/* Revision 1 match */
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static bool
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set_match_v1(const struct sk_buff *skb, struct xt_action_param *par)
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{
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const struct xt_set_info_match_v1 *info = par->matchinfo;
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ADT_OPT(opt, par->family, info->match_set.dim,
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info->match_set.flags, 0, UINT_MAX);
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if (opt.flags & IPSET_RETURN_NOMATCH)
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opt.cmdflags |= IPSET_FLAG_RETURN_NOMATCH;
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return match_set(info->match_set.index, skb, par, &opt,
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info->match_set.flags & IPSET_INV_MATCH);
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}
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static int
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set_match_v1_checkentry(const struct xt_mtchk_param *par)
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{
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struct xt_set_info_match_v1 *info = par->matchinfo;
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ip_set_id_t index;
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index = ip_set_nfnl_get_byindex(par->net, info->match_set.index);
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if (index == IPSET_INVALID_ID) {
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pr_warning("Cannot find set identified by id %u to match\n",
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info->match_set.index);
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return -ENOENT;
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}
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if (info->match_set.dim > IPSET_DIM_MAX) {
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pr_warning("Protocol error: set match dimension "
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"is over the limit!\n");
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ip_set_nfnl_put(par->net, info->match_set.index);
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return -ERANGE;
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}
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return 0;
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}
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static void
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set_match_v1_destroy(const struct xt_mtdtor_param *par)
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{
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struct xt_set_info_match_v1 *info = par->matchinfo;
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ip_set_nfnl_put(par->net, info->match_set.index);
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}
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/* Revision 3 match */
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static bool
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match_counter(u64 counter, const struct ip_set_counter_match *info)
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{
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switch (info->op) {
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case IPSET_COUNTER_NONE:
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return true;
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case IPSET_COUNTER_EQ:
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return counter == info->value;
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case IPSET_COUNTER_NE:
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return counter != info->value;
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case IPSET_COUNTER_LT:
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return counter < info->value;
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case IPSET_COUNTER_GT:
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return counter > info->value;
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}
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return false;
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}
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static bool
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set_match_v3(const struct sk_buff *skb, struct xt_action_param *par)
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{
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const struct xt_set_info_match_v3 *info = par->matchinfo;
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ADT_OPT(opt, par->family, info->match_set.dim,
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info->match_set.flags, info->flags, UINT_MAX);
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int ret;
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if (info->packets.op != IPSET_COUNTER_NONE ||
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info->bytes.op != IPSET_COUNTER_NONE)
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opt.cmdflags |= IPSET_FLAG_MATCH_COUNTERS;
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ret = match_set(info->match_set.index, skb, par, &opt,
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info->match_set.flags & IPSET_INV_MATCH);
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if (!(ret && opt.cmdflags & IPSET_FLAG_MATCH_COUNTERS))
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return ret;
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if (!match_counter(opt.ext.packets, &info->packets))
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return 0;
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return match_counter(opt.ext.bytes, &info->bytes);
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}
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#define set_match_v3_checkentry set_match_v1_checkentry
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#define set_match_v3_destroy set_match_v1_destroy
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/* Revision 0 interface: backward compatible with netfilter/iptables */
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static unsigned int
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set_target_v0(struct sk_buff *skb, const struct xt_action_param *par)
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{
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const struct xt_set_info_target_v0 *info = par->targinfo;
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ADT_OPT(add_opt, par->family, info->add_set.u.compat.dim,
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info->add_set.u.compat.flags, 0, UINT_MAX);
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ADT_OPT(del_opt, par->family, info->del_set.u.compat.dim,
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info->del_set.u.compat.flags, 0, UINT_MAX);
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if (info->add_set.index != IPSET_INVALID_ID)
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ip_set_add(info->add_set.index, skb, par, &add_opt);
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if (info->del_set.index != IPSET_INVALID_ID)
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ip_set_del(info->del_set.index, skb, par, &del_opt);
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return XT_CONTINUE;
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}
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static int
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set_target_v0_checkentry(const struct xt_tgchk_param *par)
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{
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struct xt_set_info_target_v0 *info = par->targinfo;
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ip_set_id_t index;
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if (info->add_set.index != IPSET_INVALID_ID) {
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index = ip_set_nfnl_get_byindex(par->net, info->add_set.index);
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if (index == IPSET_INVALID_ID) {
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pr_warning("Cannot find add_set index %u as target\n",
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info->add_set.index);
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return -ENOENT;
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}
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}
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if (info->del_set.index != IPSET_INVALID_ID) {
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index = ip_set_nfnl_get_byindex(par->net, info->del_set.index);
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if (index == IPSET_INVALID_ID) {
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pr_warning("Cannot find del_set index %u as target\n",
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info->del_set.index);
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if (info->add_set.index != IPSET_INVALID_ID)
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ip_set_nfnl_put(par->net, info->add_set.index);
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return -ENOENT;
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}
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}
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if (info->add_set.u.flags[IPSET_DIM_MAX-1] != 0 ||
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info->del_set.u.flags[IPSET_DIM_MAX-1] != 0) {
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pr_warning("Protocol error: SET target dimension "
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"is over the limit!\n");
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if (info->add_set.index != IPSET_INVALID_ID)
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ip_set_nfnl_put(par->net, info->add_set.index);
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if (info->del_set.index != IPSET_INVALID_ID)
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ip_set_nfnl_put(par->net, info->del_set.index);
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return -ERANGE;
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}
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/* Fill out compatibility data */
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compat_flags(&info->add_set);
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compat_flags(&info->del_set);
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return 0;
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}
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static void
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set_target_v0_destroy(const struct xt_tgdtor_param *par)
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{
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const struct xt_set_info_target_v0 *info = par->targinfo;
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if (info->add_set.index != IPSET_INVALID_ID)
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ip_set_nfnl_put(par->net, info->add_set.index);
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if (info->del_set.index != IPSET_INVALID_ID)
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ip_set_nfnl_put(par->net, info->del_set.index);
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}
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/* Revision 1 target */
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static unsigned int
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set_target_v1(struct sk_buff *skb, const struct xt_action_param *par)
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{
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const struct xt_set_info_target_v1 *info = par->targinfo;
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ADT_OPT(add_opt, par->family, info->add_set.dim,
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info->add_set.flags, 0, UINT_MAX);
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ADT_OPT(del_opt, par->family, info->del_set.dim,
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info->del_set.flags, 0, UINT_MAX);
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if (info->add_set.index != IPSET_INVALID_ID)
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ip_set_add(info->add_set.index, skb, par, &add_opt);
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if (info->del_set.index != IPSET_INVALID_ID)
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ip_set_del(info->del_set.index, skb, par, &del_opt);
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return XT_CONTINUE;
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}
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static int
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set_target_v1_checkentry(const struct xt_tgchk_param *par)
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{
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const struct xt_set_info_target_v1 *info = par->targinfo;
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ip_set_id_t index;
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if (info->add_set.index != IPSET_INVALID_ID) {
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index = ip_set_nfnl_get_byindex(par->net, info->add_set.index);
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if (index == IPSET_INVALID_ID) {
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pr_warning("Cannot find add_set index %u as target\n",
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info->add_set.index);
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return -ENOENT;
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}
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}
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if (info->del_set.index != IPSET_INVALID_ID) {
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index = ip_set_nfnl_get_byindex(par->net, info->del_set.index);
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if (index == IPSET_INVALID_ID) {
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pr_warning("Cannot find del_set index %u as target\n",
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info->del_set.index);
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if (info->add_set.index != IPSET_INVALID_ID)
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ip_set_nfnl_put(par->net, info->add_set.index);
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return -ENOENT;
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}
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}
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if (info->add_set.dim > IPSET_DIM_MAX ||
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info->del_set.dim > IPSET_DIM_MAX) {
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pr_warning("Protocol error: SET target dimension "
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"is over the limit!\n");
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if (info->add_set.index != IPSET_INVALID_ID)
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ip_set_nfnl_put(par->net, info->add_set.index);
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if (info->del_set.index != IPSET_INVALID_ID)
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ip_set_nfnl_put(par->net, info->del_set.index);
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return -ERANGE;
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}
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return 0;
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}
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static void
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set_target_v1_destroy(const struct xt_tgdtor_param *par)
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{
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const struct xt_set_info_target_v1 *info = par->targinfo;
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if (info->add_set.index != IPSET_INVALID_ID)
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ip_set_nfnl_put(par->net, info->add_set.index);
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if (info->del_set.index != IPSET_INVALID_ID)
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ip_set_nfnl_put(par->net, info->del_set.index);
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}
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/* Revision 2 target */
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static unsigned int
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set_target_v2(struct sk_buff *skb, const struct xt_action_param *par)
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{
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const struct xt_set_info_target_v2 *info = par->targinfo;
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ADT_OPT(add_opt, par->family, info->add_set.dim,
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info->add_set.flags, info->flags, info->timeout);
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ADT_OPT(del_opt, par->family, info->del_set.dim,
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info->del_set.flags, 0, UINT_MAX);
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/* Normalize to fit into jiffies */
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if (add_opt.ext.timeout != IPSET_NO_TIMEOUT &&
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add_opt.ext.timeout > UINT_MAX/MSEC_PER_SEC)
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add_opt.ext.timeout = UINT_MAX/MSEC_PER_SEC;
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if (info->add_set.index != IPSET_INVALID_ID)
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ip_set_add(info->add_set.index, skb, par, &add_opt);
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if (info->del_set.index != IPSET_INVALID_ID)
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ip_set_del(info->del_set.index, skb, par, &del_opt);
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return XT_CONTINUE;
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}
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#define set_target_v2_checkentry set_target_v1_checkentry
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#define set_target_v2_destroy set_target_v1_destroy
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static struct xt_match set_matches[] __read_mostly = {
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{
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.name = "set",
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.family = NFPROTO_IPV4,
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.revision = 0,
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.match = set_match_v0,
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.matchsize = sizeof(struct xt_set_info_match_v0),
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.checkentry = set_match_v0_checkentry,
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.destroy = set_match_v0_destroy,
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.me = THIS_MODULE
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},
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{
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.name = "set",
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.family = NFPROTO_IPV4,
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.revision = 1,
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.match = set_match_v1,
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.matchsize = sizeof(struct xt_set_info_match_v1),
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.checkentry = set_match_v1_checkentry,
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.destroy = set_match_v1_destroy,
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.me = THIS_MODULE
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},
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{
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.name = "set",
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.family = NFPROTO_IPV6,
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.revision = 1,
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.match = set_match_v1,
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.matchsize = sizeof(struct xt_set_info_match_v1),
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.checkentry = set_match_v1_checkentry,
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.destroy = set_match_v1_destroy,
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.me = THIS_MODULE
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},
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/* --return-nomatch flag support */
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{
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.name = "set",
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.family = NFPROTO_IPV4,
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.revision = 2,
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.match = set_match_v1,
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.matchsize = sizeof(struct xt_set_info_match_v1),
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.checkentry = set_match_v1_checkentry,
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.destroy = set_match_v1_destroy,
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.me = THIS_MODULE
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},
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{
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.name = "set",
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.family = NFPROTO_IPV6,
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.revision = 2,
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.match = set_match_v1,
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.matchsize = sizeof(struct xt_set_info_match_v1),
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.checkentry = set_match_v1_checkentry,
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.destroy = set_match_v1_destroy,
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.me = THIS_MODULE
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},
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/* counters support: update, match */
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{
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.name = "set",
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.family = NFPROTO_IPV4,
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.revision = 3,
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.match = set_match_v3,
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.matchsize = sizeof(struct xt_set_info_match_v3),
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.checkentry = set_match_v3_checkentry,
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.destroy = set_match_v3_destroy,
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.me = THIS_MODULE
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},
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{
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.name = "set",
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.family = NFPROTO_IPV6,
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.revision = 3,
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.match = set_match_v3,
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.matchsize = sizeof(struct xt_set_info_match_v3),
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.checkentry = set_match_v3_checkentry,
|
|
.destroy = set_match_v3_destroy,
|
|
.me = THIS_MODULE
|
|
},
|
|
};
|
|
|
|
static struct xt_target set_targets[] __read_mostly = {
|
|
{
|
|
.name = "SET",
|
|
.revision = 0,
|
|
.family = NFPROTO_IPV4,
|
|
.target = set_target_v0,
|
|
.targetsize = sizeof(struct xt_set_info_target_v0),
|
|
.checkentry = set_target_v0_checkentry,
|
|
.destroy = set_target_v0_destroy,
|
|
.me = THIS_MODULE
|
|
},
|
|
{
|
|
.name = "SET",
|
|
.revision = 1,
|
|
.family = NFPROTO_IPV4,
|
|
.target = set_target_v1,
|
|
.targetsize = sizeof(struct xt_set_info_target_v1),
|
|
.checkentry = set_target_v1_checkentry,
|
|
.destroy = set_target_v1_destroy,
|
|
.me = THIS_MODULE
|
|
},
|
|
{
|
|
.name = "SET",
|
|
.revision = 1,
|
|
.family = NFPROTO_IPV6,
|
|
.target = set_target_v1,
|
|
.targetsize = sizeof(struct xt_set_info_target_v1),
|
|
.checkentry = set_target_v1_checkentry,
|
|
.destroy = set_target_v1_destroy,
|
|
.me = THIS_MODULE
|
|
},
|
|
/* --timeout and --exist flags support */
|
|
{
|
|
.name = "SET",
|
|
.revision = 2,
|
|
.family = NFPROTO_IPV4,
|
|
.target = set_target_v2,
|
|
.targetsize = sizeof(struct xt_set_info_target_v2),
|
|
.checkentry = set_target_v2_checkentry,
|
|
.destroy = set_target_v2_destroy,
|
|
.me = THIS_MODULE
|
|
},
|
|
{
|
|
.name = "SET",
|
|
.revision = 2,
|
|
.family = NFPROTO_IPV6,
|
|
.target = set_target_v2,
|
|
.targetsize = sizeof(struct xt_set_info_target_v2),
|
|
.checkentry = set_target_v2_checkentry,
|
|
.destroy = set_target_v2_destroy,
|
|
.me = THIS_MODULE
|
|
},
|
|
};
|
|
|
|
static int __init xt_set_init(void)
|
|
{
|
|
int ret = xt_register_matches(set_matches, ARRAY_SIZE(set_matches));
|
|
|
|
if (!ret) {
|
|
ret = xt_register_targets(set_targets,
|
|
ARRAY_SIZE(set_targets));
|
|
if (ret)
|
|
xt_unregister_matches(set_matches,
|
|
ARRAY_SIZE(set_matches));
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static void __exit xt_set_fini(void)
|
|
{
|
|
xt_unregister_matches(set_matches, ARRAY_SIZE(set_matches));
|
|
xt_unregister_targets(set_targets, ARRAY_SIZE(set_targets));
|
|
}
|
|
|
|
module_init(xt_set_init);
|
|
module_exit(xt_set_fini);
|