2387 lines
58 KiB
C
2387 lines
58 KiB
C
/*
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* Packet matching code.
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*
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* Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
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* Copyright (C) 2000-2005 Netfilter Core Team <coreteam@netfilter.org>
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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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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/capability.h>
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#include <linux/in.h>
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#include <linux/skbuff.h>
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#include <linux/kmod.h>
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#include <linux/vmalloc.h>
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#include <linux/netdevice.h>
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#include <linux/module.h>
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#include <linux/poison.h>
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#include <linux/icmpv6.h>
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#include <net/ipv6.h>
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#include <net/compat.h>
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#include <asm/uaccess.h>
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#include <linux/mutex.h>
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#include <linux/proc_fs.h>
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#include <linux/err.h>
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#include <linux/cpumask.h>
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#include <linux/netfilter_ipv6/ip6_tables.h>
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#include <linux/netfilter/x_tables.h>
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#include <net/netfilter/nf_log.h>
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#include "../../netfilter/xt_repldata.h"
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
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MODULE_DESCRIPTION("IPv6 packet filter");
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/*#define DEBUG_IP_FIREWALL*/
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/*#define DEBUG_ALLOW_ALL*/ /* Useful for remote debugging */
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/*#define DEBUG_IP_FIREWALL_USER*/
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#ifdef DEBUG_IP_FIREWALL
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#define dprintf(format, args...) pr_info(format , ## args)
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#else
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#define dprintf(format, args...)
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#endif
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#ifdef DEBUG_IP_FIREWALL_USER
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#define duprintf(format, args...) pr_info(format , ## args)
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#else
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#define duprintf(format, args...)
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#endif
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#ifdef CONFIG_NETFILTER_DEBUG
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#define IP_NF_ASSERT(x) \
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do { \
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if (!(x)) \
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printk("IP_NF_ASSERT: %s:%s:%u\n", \
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__func__, __FILE__, __LINE__); \
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} while(0)
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#else
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#define IP_NF_ASSERT(x)
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#endif
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#if 0
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/* All the better to debug you with... */
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#define static
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#define inline
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#endif
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void *ip6t_alloc_initial_table(const struct xt_table *info)
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{
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return xt_alloc_initial_table(ip6t, IP6T);
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}
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EXPORT_SYMBOL_GPL(ip6t_alloc_initial_table);
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/*
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We keep a set of rules for each CPU, so we can avoid write-locking
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them in the softirq when updating the counters and therefore
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only need to read-lock in the softirq; doing a write_lock_bh() in user
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context stops packets coming through and allows user context to read
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the counters or update the rules.
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Hence the start of any table is given by get_table() below. */
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/* Check for an extension */
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int
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ip6t_ext_hdr(u8 nexthdr)
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{
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return ( (nexthdr == IPPROTO_HOPOPTS) ||
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(nexthdr == IPPROTO_ROUTING) ||
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(nexthdr == IPPROTO_FRAGMENT) ||
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(nexthdr == IPPROTO_ESP) ||
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(nexthdr == IPPROTO_AH) ||
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(nexthdr == IPPROTO_NONE) ||
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(nexthdr == IPPROTO_DSTOPTS) );
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}
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/* Returns whether matches rule or not. */
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/* Performance critical - called for every packet */
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static inline bool
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ip6_packet_match(const struct sk_buff *skb,
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const char *indev,
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const char *outdev,
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const struct ip6t_ip6 *ip6info,
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unsigned int *protoff,
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int *fragoff, bool *hotdrop)
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{
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unsigned long ret;
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const struct ipv6hdr *ipv6 = ipv6_hdr(skb);
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#define FWINV(bool, invflg) ((bool) ^ !!(ip6info->invflags & (invflg)))
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if (FWINV(ipv6_masked_addr_cmp(&ipv6->saddr, &ip6info->smsk,
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&ip6info->src), IP6T_INV_SRCIP) ||
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FWINV(ipv6_masked_addr_cmp(&ipv6->daddr, &ip6info->dmsk,
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&ip6info->dst), IP6T_INV_DSTIP)) {
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dprintf("Source or dest mismatch.\n");
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/*
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dprintf("SRC: %u. Mask: %u. Target: %u.%s\n", ip->saddr,
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ipinfo->smsk.s_addr, ipinfo->src.s_addr,
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ipinfo->invflags & IP6T_INV_SRCIP ? " (INV)" : "");
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dprintf("DST: %u. Mask: %u. Target: %u.%s\n", ip->daddr,
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ipinfo->dmsk.s_addr, ipinfo->dst.s_addr,
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ipinfo->invflags & IP6T_INV_DSTIP ? " (INV)" : "");*/
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return false;
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}
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ret = ifname_compare_aligned(indev, ip6info->iniface, ip6info->iniface_mask);
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if (FWINV(ret != 0, IP6T_INV_VIA_IN)) {
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dprintf("VIA in mismatch (%s vs %s).%s\n",
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indev, ip6info->iniface,
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ip6info->invflags&IP6T_INV_VIA_IN ?" (INV)":"");
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return false;
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}
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ret = ifname_compare_aligned(outdev, ip6info->outiface, ip6info->outiface_mask);
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if (FWINV(ret != 0, IP6T_INV_VIA_OUT)) {
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dprintf("VIA out mismatch (%s vs %s).%s\n",
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outdev, ip6info->outiface,
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ip6info->invflags&IP6T_INV_VIA_OUT ?" (INV)":"");
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return false;
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}
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/* ... might want to do something with class and flowlabel here ... */
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/* look for the desired protocol header */
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if((ip6info->flags & IP6T_F_PROTO)) {
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int protohdr;
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unsigned short _frag_off;
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protohdr = ipv6_find_hdr(skb, protoff, -1, &_frag_off);
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if (protohdr < 0) {
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if (_frag_off == 0)
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*hotdrop = true;
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return false;
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}
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*fragoff = _frag_off;
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dprintf("Packet protocol %hi ?= %s%hi.\n",
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protohdr,
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ip6info->invflags & IP6T_INV_PROTO ? "!":"",
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ip6info->proto);
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if (ip6info->proto == protohdr) {
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if(ip6info->invflags & IP6T_INV_PROTO) {
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return false;
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}
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return true;
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}
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/* We need match for the '-p all', too! */
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if ((ip6info->proto != 0) &&
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!(ip6info->invflags & IP6T_INV_PROTO))
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return false;
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}
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return true;
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}
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/* should be ip6 safe */
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static bool
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ip6_checkentry(const struct ip6t_ip6 *ipv6)
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{
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if (ipv6->flags & ~IP6T_F_MASK) {
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duprintf("Unknown flag bits set: %08X\n",
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ipv6->flags & ~IP6T_F_MASK);
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return false;
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}
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if (ipv6->invflags & ~IP6T_INV_MASK) {
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duprintf("Unknown invflag bits set: %08X\n",
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ipv6->invflags & ~IP6T_INV_MASK);
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return false;
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}
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return true;
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}
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static unsigned int
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ip6t_error(struct sk_buff *skb, const struct xt_action_param *par)
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{
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if (net_ratelimit())
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pr_info("error: `%s'\n", (const char *)par->targinfo);
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return NF_DROP;
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}
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static inline struct ip6t_entry *
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get_entry(const void *base, unsigned int offset)
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{
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return (struct ip6t_entry *)(base + offset);
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}
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/* All zeroes == unconditional rule. */
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/* Mildly perf critical (only if packet tracing is on) */
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static inline bool unconditional(const struct ip6t_ip6 *ipv6)
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{
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static const struct ip6t_ip6 uncond;
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return memcmp(ipv6, &uncond, sizeof(uncond)) == 0;
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}
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static inline const struct ip6t_entry_target *
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ip6t_get_target_c(const struct ip6t_entry *e)
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{
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return ip6t_get_target((struct ip6t_entry *)e);
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}
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#if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \
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defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE)
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/* This cries for unification! */
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static const char *const hooknames[] = {
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[NF_INET_PRE_ROUTING] = "PREROUTING",
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[NF_INET_LOCAL_IN] = "INPUT",
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[NF_INET_FORWARD] = "FORWARD",
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[NF_INET_LOCAL_OUT] = "OUTPUT",
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[NF_INET_POST_ROUTING] = "POSTROUTING",
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};
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enum nf_ip_trace_comments {
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NF_IP6_TRACE_COMMENT_RULE,
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NF_IP6_TRACE_COMMENT_RETURN,
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NF_IP6_TRACE_COMMENT_POLICY,
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};
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static const char *const comments[] = {
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[NF_IP6_TRACE_COMMENT_RULE] = "rule",
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[NF_IP6_TRACE_COMMENT_RETURN] = "return",
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[NF_IP6_TRACE_COMMENT_POLICY] = "policy",
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};
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static struct nf_loginfo trace_loginfo = {
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.type = NF_LOG_TYPE_LOG,
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.u = {
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.log = {
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.level = 4,
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.logflags = NF_LOG_MASK,
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},
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},
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};
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/* Mildly perf critical (only if packet tracing is on) */
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static inline int
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get_chainname_rulenum(const struct ip6t_entry *s, const struct ip6t_entry *e,
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const char *hookname, const char **chainname,
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const char **comment, unsigned int *rulenum)
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{
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const struct ip6t_standard_target *t = (void *)ip6t_get_target_c(s);
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if (strcmp(t->target.u.kernel.target->name, IP6T_ERROR_TARGET) == 0) {
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/* Head of user chain: ERROR target with chainname */
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*chainname = t->target.data;
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(*rulenum) = 0;
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} else if (s == e) {
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(*rulenum)++;
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if (s->target_offset == sizeof(struct ip6t_entry) &&
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strcmp(t->target.u.kernel.target->name,
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IP6T_STANDARD_TARGET) == 0 &&
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t->verdict < 0 &&
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unconditional(&s->ipv6)) {
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/* Tail of chains: STANDARD target (return/policy) */
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*comment = *chainname == hookname
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? comments[NF_IP6_TRACE_COMMENT_POLICY]
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: comments[NF_IP6_TRACE_COMMENT_RETURN];
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}
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return 1;
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} else
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(*rulenum)++;
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return 0;
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}
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static void trace_packet(const struct sk_buff *skb,
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unsigned int hook,
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const struct net_device *in,
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const struct net_device *out,
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const char *tablename,
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const struct xt_table_info *private,
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const struct ip6t_entry *e)
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{
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const void *table_base;
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const struct ip6t_entry *root;
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const char *hookname, *chainname, *comment;
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const struct ip6t_entry *iter;
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unsigned int rulenum = 0;
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table_base = private->entries[smp_processor_id()];
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root = get_entry(table_base, private->hook_entry[hook]);
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hookname = chainname = hooknames[hook];
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comment = comments[NF_IP6_TRACE_COMMENT_RULE];
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xt_entry_foreach(iter, root, private->size - private->hook_entry[hook])
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if (get_chainname_rulenum(iter, e, hookname,
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&chainname, &comment, &rulenum) != 0)
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break;
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nf_log_packet(AF_INET6, hook, skb, in, out, &trace_loginfo,
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"TRACE: %s:%s:%s:%u ",
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tablename, chainname, comment, rulenum);
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}
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#endif
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static inline __pure struct ip6t_entry *
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ip6t_next_entry(const struct ip6t_entry *entry)
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{
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return (void *)entry + entry->next_offset;
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}
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/* Returns one of the generic firewall policies, like NF_ACCEPT. */
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unsigned int
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ip6t_do_table(struct sk_buff *skb,
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unsigned int hook,
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const struct net_device *in,
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const struct net_device *out,
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struct xt_table *table)
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{
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static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long))));
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/* Initializing verdict to NF_DROP keeps gcc happy. */
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unsigned int verdict = NF_DROP;
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const char *indev, *outdev;
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const void *table_base;
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struct ip6t_entry *e, **jumpstack;
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unsigned int *stackptr, origptr, cpu;
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const struct xt_table_info *private;
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struct xt_action_param acpar;
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/* Initialization */
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indev = in ? in->name : nulldevname;
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outdev = out ? out->name : nulldevname;
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/* We handle fragments by dealing with the first fragment as
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* if it was a normal packet. All other fragments are treated
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* normally, except that they will NEVER match rules that ask
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* things we don't know, ie. tcp syn flag or ports). If the
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* rule is also a fragment-specific rule, non-fragments won't
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* match it. */
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acpar.hotdrop = false;
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acpar.in = in;
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acpar.out = out;
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acpar.family = NFPROTO_IPV6;
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acpar.hooknum = hook;
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IP_NF_ASSERT(table->valid_hooks & (1 << hook));
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xt_info_rdlock_bh();
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private = table->private;
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cpu = smp_processor_id();
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table_base = private->entries[cpu];
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jumpstack = (struct ip6t_entry **)private->jumpstack[cpu];
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stackptr = &private->stackptr[cpu];
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origptr = *stackptr;
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e = get_entry(table_base, private->hook_entry[hook]);
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do {
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const struct ip6t_entry_target *t;
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const struct xt_entry_match *ematch;
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IP_NF_ASSERT(e);
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if (!ip6_packet_match(skb, indev, outdev, &e->ipv6,
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&acpar.thoff, &acpar.fragoff, &acpar.hotdrop)) {
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no_match:
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e = ip6t_next_entry(e);
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continue;
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}
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xt_ematch_foreach(ematch, e) {
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acpar.match = ematch->u.kernel.match;
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acpar.matchinfo = ematch->data;
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if (!acpar.match->match(skb, &acpar))
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goto no_match;
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}
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ADD_COUNTER(e->counters,
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ntohs(ipv6_hdr(skb)->payload_len) +
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sizeof(struct ipv6hdr), 1);
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t = ip6t_get_target_c(e);
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IP_NF_ASSERT(t->u.kernel.target);
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#if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \
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defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE)
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/* The packet is traced: log it */
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if (unlikely(skb->nf_trace))
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trace_packet(skb, hook, in, out,
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table->name, private, e);
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#endif
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/* Standard target? */
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if (!t->u.kernel.target->target) {
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int v;
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v = ((struct ip6t_standard_target *)t)->verdict;
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if (v < 0) {
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/* Pop from stack? */
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if (v != IP6T_RETURN) {
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verdict = (unsigned)(-v) - 1;
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break;
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}
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if (*stackptr == 0)
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e = get_entry(table_base,
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private->underflow[hook]);
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else
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e = ip6t_next_entry(jumpstack[--*stackptr]);
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continue;
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}
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if (table_base + v != ip6t_next_entry(e) &&
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!(e->ipv6.flags & IP6T_F_GOTO)) {
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if (*stackptr >= private->stacksize) {
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verdict = NF_DROP;
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break;
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}
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jumpstack[(*stackptr)++] = e;
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}
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e = get_entry(table_base, v);
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continue;
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}
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acpar.target = t->u.kernel.target;
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acpar.targinfo = t->data;
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verdict = t->u.kernel.target->target(skb, &acpar);
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if (verdict == IP6T_CONTINUE)
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e = ip6t_next_entry(e);
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else
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/* Verdict */
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break;
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} while (!acpar.hotdrop);
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|
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xt_info_rdunlock_bh();
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*stackptr = origptr;
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|
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#ifdef DEBUG_ALLOW_ALL
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return NF_ACCEPT;
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#else
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if (acpar.hotdrop)
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return NF_DROP;
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else return verdict;
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#endif
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}
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|
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/* Figures out from what hook each rule can be called: returns 0 if
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there are loops. Puts hook bitmask in comefrom. */
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static int
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mark_source_chains(const struct xt_table_info *newinfo,
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unsigned int valid_hooks, void *entry0)
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{
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unsigned int hook;
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|
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/* No recursion; use packet counter to save back ptrs (reset
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to 0 as we leave), and comefrom to save source hook bitmask */
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for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) {
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unsigned int pos = newinfo->hook_entry[hook];
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struct ip6t_entry *e = (struct ip6t_entry *)(entry0 + pos);
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|
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if (!(valid_hooks & (1 << hook)))
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continue;
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|
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/* Set initial back pointer. */
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e->counters.pcnt = pos;
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|
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for (;;) {
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const struct ip6t_standard_target *t
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= (void *)ip6t_get_target_c(e);
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int visited = e->comefrom & (1 << hook);
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|
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if (e->comefrom & (1 << NF_INET_NUMHOOKS)) {
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printk("iptables: loop hook %u pos %u %08X.\n",
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hook, pos, e->comefrom);
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return 0;
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}
|
|
e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS));
|
|
|
|
/* Unconditional return/END. */
|
|
if ((e->target_offset == sizeof(struct ip6t_entry) &&
|
|
(strcmp(t->target.u.user.name,
|
|
IP6T_STANDARD_TARGET) == 0) &&
|
|
t->verdict < 0 &&
|
|
unconditional(&e->ipv6)) || visited) {
|
|
unsigned int oldpos, size;
|
|
|
|
if ((strcmp(t->target.u.user.name,
|
|
IP6T_STANDARD_TARGET) == 0) &&
|
|
t->verdict < -NF_MAX_VERDICT - 1) {
|
|
duprintf("mark_source_chains: bad "
|
|
"negative verdict (%i)\n",
|
|
t->verdict);
|
|
return 0;
|
|
}
|
|
|
|
/* Return: backtrack through the last
|
|
big jump. */
|
|
do {
|
|
e->comefrom ^= (1<<NF_INET_NUMHOOKS);
|
|
#ifdef DEBUG_IP_FIREWALL_USER
|
|
if (e->comefrom
|
|
& (1 << NF_INET_NUMHOOKS)) {
|
|
duprintf("Back unset "
|
|
"on hook %u "
|
|
"rule %u\n",
|
|
hook, pos);
|
|
}
|
|
#endif
|
|
oldpos = pos;
|
|
pos = e->counters.pcnt;
|
|
e->counters.pcnt = 0;
|
|
|
|
/* We're at the start. */
|
|
if (pos == oldpos)
|
|
goto next;
|
|
|
|
e = (struct ip6t_entry *)
|
|
(entry0 + pos);
|
|
} while (oldpos == pos + e->next_offset);
|
|
|
|
/* Move along one */
|
|
size = e->next_offset;
|
|
e = (struct ip6t_entry *)
|
|
(entry0 + pos + size);
|
|
e->counters.pcnt = pos;
|
|
pos += size;
|
|
} else {
|
|
int newpos = t->verdict;
|
|
|
|
if (strcmp(t->target.u.user.name,
|
|
IP6T_STANDARD_TARGET) == 0 &&
|
|
newpos >= 0) {
|
|
if (newpos > newinfo->size -
|
|
sizeof(struct ip6t_entry)) {
|
|
duprintf("mark_source_chains: "
|
|
"bad verdict (%i)\n",
|
|
newpos);
|
|
return 0;
|
|
}
|
|
/* This a jump; chase it. */
|
|
duprintf("Jump rule %u -> %u\n",
|
|
pos, newpos);
|
|
} else {
|
|
/* ... this is a fallthru */
|
|
newpos = pos + e->next_offset;
|
|
}
|
|
e = (struct ip6t_entry *)
|
|
(entry0 + newpos);
|
|
e->counters.pcnt = pos;
|
|
pos = newpos;
|
|
}
|
|
}
|
|
next:
|
|
duprintf("Finished chain %u\n", hook);
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static void cleanup_match(struct ip6t_entry_match *m, struct net *net)
|
|
{
|
|
struct xt_mtdtor_param par;
|
|
|
|
par.net = net;
|
|
par.match = m->u.kernel.match;
|
|
par.matchinfo = m->data;
|
|
par.family = NFPROTO_IPV6;
|
|
if (par.match->destroy != NULL)
|
|
par.match->destroy(&par);
|
|
module_put(par.match->me);
|
|
}
|
|
|
|
static int
|
|
check_entry(const struct ip6t_entry *e, const char *name)
|
|
{
|
|
const struct ip6t_entry_target *t;
|
|
|
|
if (!ip6_checkentry(&e->ipv6)) {
|
|
duprintf("ip_tables: ip check failed %p %s.\n", e, name);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (e->target_offset + sizeof(struct ip6t_entry_target) >
|
|
e->next_offset)
|
|
return -EINVAL;
|
|
|
|
t = ip6t_get_target_c(e);
|
|
if (e->target_offset + t->u.target_size > e->next_offset)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int check_match(struct ip6t_entry_match *m, struct xt_mtchk_param *par)
|
|
{
|
|
const struct ip6t_ip6 *ipv6 = par->entryinfo;
|
|
int ret;
|
|
|
|
par->match = m->u.kernel.match;
|
|
par->matchinfo = m->data;
|
|
|
|
ret = xt_check_match(par, m->u.match_size - sizeof(*m),
|
|
ipv6->proto, ipv6->invflags & IP6T_INV_PROTO);
|
|
if (ret < 0) {
|
|
duprintf("ip_tables: check failed for `%s'.\n",
|
|
par.match->name);
|
|
return ret;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
find_check_match(struct ip6t_entry_match *m, struct xt_mtchk_param *par)
|
|
{
|
|
struct xt_match *match;
|
|
int ret;
|
|
|
|
match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name,
|
|
m->u.user.revision);
|
|
if (IS_ERR(match)) {
|
|
duprintf("find_check_match: `%s' not found\n", m->u.user.name);
|
|
return PTR_ERR(match);
|
|
}
|
|
m->u.kernel.match = match;
|
|
|
|
ret = check_match(m, par);
|
|
if (ret)
|
|
goto err;
|
|
|
|
return 0;
|
|
err:
|
|
module_put(m->u.kernel.match->me);
|
|
return ret;
|
|
}
|
|
|
|
static int check_target(struct ip6t_entry *e, struct net *net, const char *name)
|
|
{
|
|
struct ip6t_entry_target *t = ip6t_get_target(e);
|
|
struct xt_tgchk_param par = {
|
|
.net = net,
|
|
.table = name,
|
|
.entryinfo = e,
|
|
.target = t->u.kernel.target,
|
|
.targinfo = t->data,
|
|
.hook_mask = e->comefrom,
|
|
.family = NFPROTO_IPV6,
|
|
};
|
|
int ret;
|
|
|
|
t = ip6t_get_target(e);
|
|
ret = xt_check_target(&par, t->u.target_size - sizeof(*t),
|
|
e->ipv6.proto, e->ipv6.invflags & IP6T_INV_PROTO);
|
|
if (ret < 0) {
|
|
duprintf("ip_tables: check failed for `%s'.\n",
|
|
t->u.kernel.target->name);
|
|
return ret;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
find_check_entry(struct ip6t_entry *e, struct net *net, const char *name,
|
|
unsigned int size)
|
|
{
|
|
struct ip6t_entry_target *t;
|
|
struct xt_target *target;
|
|
int ret;
|
|
unsigned int j;
|
|
struct xt_mtchk_param mtpar;
|
|
struct xt_entry_match *ematch;
|
|
|
|
ret = check_entry(e, name);
|
|
if (ret)
|
|
return ret;
|
|
|
|
j = 0;
|
|
mtpar.net = net;
|
|
mtpar.table = name;
|
|
mtpar.entryinfo = &e->ipv6;
|
|
mtpar.hook_mask = e->comefrom;
|
|
mtpar.family = NFPROTO_IPV6;
|
|
xt_ematch_foreach(ematch, e) {
|
|
ret = find_check_match(ematch, &mtpar);
|
|
if (ret != 0)
|
|
goto cleanup_matches;
|
|
++j;
|
|
}
|
|
|
|
t = ip6t_get_target(e);
|
|
target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name,
|
|
t->u.user.revision);
|
|
if (IS_ERR(target)) {
|
|
duprintf("find_check_entry: `%s' not found\n", t->u.user.name);
|
|
ret = PTR_ERR(target);
|
|
goto cleanup_matches;
|
|
}
|
|
t->u.kernel.target = target;
|
|
|
|
ret = check_target(e, net, name);
|
|
if (ret)
|
|
goto err;
|
|
return 0;
|
|
err:
|
|
module_put(t->u.kernel.target->me);
|
|
cleanup_matches:
|
|
xt_ematch_foreach(ematch, e) {
|
|
if (j-- == 0)
|
|
break;
|
|
cleanup_match(ematch, net);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static bool check_underflow(const struct ip6t_entry *e)
|
|
{
|
|
const struct ip6t_entry_target *t;
|
|
unsigned int verdict;
|
|
|
|
if (!unconditional(&e->ipv6))
|
|
return false;
|
|
t = ip6t_get_target_c(e);
|
|
if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0)
|
|
return false;
|
|
verdict = ((struct ip6t_standard_target *)t)->verdict;
|
|
verdict = -verdict - 1;
|
|
return verdict == NF_DROP || verdict == NF_ACCEPT;
|
|
}
|
|
|
|
static int
|
|
check_entry_size_and_hooks(struct ip6t_entry *e,
|
|
struct xt_table_info *newinfo,
|
|
const unsigned char *base,
|
|
const unsigned char *limit,
|
|
const unsigned int *hook_entries,
|
|
const unsigned int *underflows,
|
|
unsigned int valid_hooks)
|
|
{
|
|
unsigned int h;
|
|
|
|
if ((unsigned long)e % __alignof__(struct ip6t_entry) != 0 ||
|
|
(unsigned char *)e + sizeof(struct ip6t_entry) >= limit) {
|
|
duprintf("Bad offset %p\n", e);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (e->next_offset
|
|
< sizeof(struct ip6t_entry) + sizeof(struct ip6t_entry_target)) {
|
|
duprintf("checking: element %p size %u\n",
|
|
e, e->next_offset);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Check hooks & underflows */
|
|
for (h = 0; h < NF_INET_NUMHOOKS; h++) {
|
|
if (!(valid_hooks & (1 << h)))
|
|
continue;
|
|
if ((unsigned char *)e - base == hook_entries[h])
|
|
newinfo->hook_entry[h] = hook_entries[h];
|
|
if ((unsigned char *)e - base == underflows[h]) {
|
|
if (!check_underflow(e)) {
|
|
pr_err("Underflows must be unconditional and "
|
|
"use the STANDARD target with "
|
|
"ACCEPT/DROP\n");
|
|
return -EINVAL;
|
|
}
|
|
newinfo->underflow[h] = underflows[h];
|
|
}
|
|
}
|
|
|
|
/* Clear counters and comefrom */
|
|
e->counters = ((struct xt_counters) { 0, 0 });
|
|
e->comefrom = 0;
|
|
return 0;
|
|
}
|
|
|
|
static void cleanup_entry(struct ip6t_entry *e, struct net *net)
|
|
{
|
|
struct xt_tgdtor_param par;
|
|
struct ip6t_entry_target *t;
|
|
struct xt_entry_match *ematch;
|
|
|
|
/* Cleanup all matches */
|
|
xt_ematch_foreach(ematch, e)
|
|
cleanup_match(ematch, net);
|
|
t = ip6t_get_target(e);
|
|
|
|
par.net = net;
|
|
par.target = t->u.kernel.target;
|
|
par.targinfo = t->data;
|
|
par.family = NFPROTO_IPV6;
|
|
if (par.target->destroy != NULL)
|
|
par.target->destroy(&par);
|
|
module_put(par.target->me);
|
|
}
|
|
|
|
/* Checks and translates the user-supplied table segment (held in
|
|
newinfo) */
|
|
static int
|
|
translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0,
|
|
const struct ip6t_replace *repl)
|
|
{
|
|
struct ip6t_entry *iter;
|
|
unsigned int i;
|
|
int ret = 0;
|
|
|
|
newinfo->size = repl->size;
|
|
newinfo->number = repl->num_entries;
|
|
|
|
/* Init all hooks to impossible value. */
|
|
for (i = 0; i < NF_INET_NUMHOOKS; i++) {
|
|
newinfo->hook_entry[i] = 0xFFFFFFFF;
|
|
newinfo->underflow[i] = 0xFFFFFFFF;
|
|
}
|
|
|
|
duprintf("translate_table: size %u\n", newinfo->size);
|
|
i = 0;
|
|
/* Walk through entries, checking offsets. */
|
|
xt_entry_foreach(iter, entry0, newinfo->size) {
|
|
ret = check_entry_size_and_hooks(iter, newinfo, entry0,
|
|
entry0 + repl->size,
|
|
repl->hook_entry,
|
|
repl->underflow,
|
|
repl->valid_hooks);
|
|
if (ret != 0)
|
|
return ret;
|
|
++i;
|
|
if (strcmp(ip6t_get_target(iter)->u.user.name,
|
|
XT_ERROR_TARGET) == 0)
|
|
++newinfo->stacksize;
|
|
}
|
|
|
|
if (i != repl->num_entries) {
|
|
duprintf("translate_table: %u not %u entries\n",
|
|
i, repl->num_entries);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Check hooks all assigned */
|
|
for (i = 0; i < NF_INET_NUMHOOKS; i++) {
|
|
/* Only hooks which are valid */
|
|
if (!(repl->valid_hooks & (1 << i)))
|
|
continue;
|
|
if (newinfo->hook_entry[i] == 0xFFFFFFFF) {
|
|
duprintf("Invalid hook entry %u %u\n",
|
|
i, repl->hook_entry[i]);
|
|
return -EINVAL;
|
|
}
|
|
if (newinfo->underflow[i] == 0xFFFFFFFF) {
|
|
duprintf("Invalid underflow %u %u\n",
|
|
i, repl->underflow[i]);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
if (!mark_source_chains(newinfo, repl->valid_hooks, entry0))
|
|
return -ELOOP;
|
|
|
|
/* Finally, each sanity check must pass */
|
|
i = 0;
|
|
xt_entry_foreach(iter, entry0, newinfo->size) {
|
|
ret = find_check_entry(iter, net, repl->name, repl->size);
|
|
if (ret != 0)
|
|
break;
|
|
++i;
|
|
}
|
|
|
|
if (ret != 0) {
|
|
xt_entry_foreach(iter, entry0, newinfo->size) {
|
|
if (i-- == 0)
|
|
break;
|
|
cleanup_entry(iter, net);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/* And one copy for every other CPU */
|
|
for_each_possible_cpu(i) {
|
|
if (newinfo->entries[i] && newinfo->entries[i] != entry0)
|
|
memcpy(newinfo->entries[i], entry0, newinfo->size);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
get_counters(const struct xt_table_info *t,
|
|
struct xt_counters counters[])
|
|
{
|
|
struct ip6t_entry *iter;
|
|
unsigned int cpu;
|
|
unsigned int i;
|
|
unsigned int curcpu;
|
|
|
|
/* Instead of clearing (by a previous call to memset())
|
|
* the counters and using adds, we set the counters
|
|
* with data used by 'current' CPU
|
|
*
|
|
* Bottom half has to be disabled to prevent deadlock
|
|
* if new softirq were to run and call ipt_do_table
|
|
*/
|
|
local_bh_disable();
|
|
curcpu = smp_processor_id();
|
|
|
|
i = 0;
|
|
xt_entry_foreach(iter, t->entries[curcpu], t->size) {
|
|
SET_COUNTER(counters[i], iter->counters.bcnt,
|
|
iter->counters.pcnt);
|
|
++i;
|
|
}
|
|
|
|
for_each_possible_cpu(cpu) {
|
|
if (cpu == curcpu)
|
|
continue;
|
|
i = 0;
|
|
xt_info_wrlock(cpu);
|
|
xt_entry_foreach(iter, t->entries[cpu], t->size) {
|
|
ADD_COUNTER(counters[i], iter->counters.bcnt,
|
|
iter->counters.pcnt);
|
|
++i;
|
|
}
|
|
xt_info_wrunlock(cpu);
|
|
}
|
|
local_bh_enable();
|
|
}
|
|
|
|
static struct xt_counters *alloc_counters(const struct xt_table *table)
|
|
{
|
|
unsigned int countersize;
|
|
struct xt_counters *counters;
|
|
const struct xt_table_info *private = table->private;
|
|
|
|
/* We need atomic snapshot of counters: rest doesn't change
|
|
(other than comefrom, which userspace doesn't care
|
|
about). */
|
|
countersize = sizeof(struct xt_counters) * private->number;
|
|
counters = vmalloc_node(countersize, numa_node_id());
|
|
|
|
if (counters == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
get_counters(private, counters);
|
|
|
|
return counters;
|
|
}
|
|
|
|
static int
|
|
copy_entries_to_user(unsigned int total_size,
|
|
const struct xt_table *table,
|
|
void __user *userptr)
|
|
{
|
|
unsigned int off, num;
|
|
const struct ip6t_entry *e;
|
|
struct xt_counters *counters;
|
|
const struct xt_table_info *private = table->private;
|
|
int ret = 0;
|
|
const void *loc_cpu_entry;
|
|
|
|
counters = alloc_counters(table);
|
|
if (IS_ERR(counters))
|
|
return PTR_ERR(counters);
|
|
|
|
/* choose the copy that is on our node/cpu, ...
|
|
* This choice is lazy (because current thread is
|
|
* allowed to migrate to another cpu)
|
|
*/
|
|
loc_cpu_entry = private->entries[raw_smp_processor_id()];
|
|
if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) {
|
|
ret = -EFAULT;
|
|
goto free_counters;
|
|
}
|
|
|
|
/* FIXME: use iterator macros --RR */
|
|
/* ... then go back and fix counters and names */
|
|
for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){
|
|
unsigned int i;
|
|
const struct ip6t_entry_match *m;
|
|
const struct ip6t_entry_target *t;
|
|
|
|
e = (struct ip6t_entry *)(loc_cpu_entry + off);
|
|
if (copy_to_user(userptr + off
|
|
+ offsetof(struct ip6t_entry, counters),
|
|
&counters[num],
|
|
sizeof(counters[num])) != 0) {
|
|
ret = -EFAULT;
|
|
goto free_counters;
|
|
}
|
|
|
|
for (i = sizeof(struct ip6t_entry);
|
|
i < e->target_offset;
|
|
i += m->u.match_size) {
|
|
m = (void *)e + i;
|
|
|
|
if (copy_to_user(userptr + off + i
|
|
+ offsetof(struct ip6t_entry_match,
|
|
u.user.name),
|
|
m->u.kernel.match->name,
|
|
strlen(m->u.kernel.match->name)+1)
|
|
!= 0) {
|
|
ret = -EFAULT;
|
|
goto free_counters;
|
|
}
|
|
}
|
|
|
|
t = ip6t_get_target_c(e);
|
|
if (copy_to_user(userptr + off + e->target_offset
|
|
+ offsetof(struct ip6t_entry_target,
|
|
u.user.name),
|
|
t->u.kernel.target->name,
|
|
strlen(t->u.kernel.target->name)+1) != 0) {
|
|
ret = -EFAULT;
|
|
goto free_counters;
|
|
}
|
|
}
|
|
|
|
free_counters:
|
|
vfree(counters);
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
static void compat_standard_from_user(void *dst, const void *src)
|
|
{
|
|
int v = *(compat_int_t *)src;
|
|
|
|
if (v > 0)
|
|
v += xt_compat_calc_jump(AF_INET6, v);
|
|
memcpy(dst, &v, sizeof(v));
|
|
}
|
|
|
|
static int compat_standard_to_user(void __user *dst, const void *src)
|
|
{
|
|
compat_int_t cv = *(int *)src;
|
|
|
|
if (cv > 0)
|
|
cv -= xt_compat_calc_jump(AF_INET6, cv);
|
|
return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0;
|
|
}
|
|
|
|
static int compat_calc_entry(const struct ip6t_entry *e,
|
|
const struct xt_table_info *info,
|
|
const void *base, struct xt_table_info *newinfo)
|
|
{
|
|
const struct xt_entry_match *ematch;
|
|
const struct ip6t_entry_target *t;
|
|
unsigned int entry_offset;
|
|
int off, i, ret;
|
|
|
|
off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
|
|
entry_offset = (void *)e - base;
|
|
xt_ematch_foreach(ematch, e)
|
|
off += xt_compat_match_offset(ematch->u.kernel.match);
|
|
t = ip6t_get_target_c(e);
|
|
off += xt_compat_target_offset(t->u.kernel.target);
|
|
newinfo->size -= off;
|
|
ret = xt_compat_add_offset(AF_INET6, entry_offset, off);
|
|
if (ret)
|
|
return ret;
|
|
|
|
for (i = 0; i < NF_INET_NUMHOOKS; i++) {
|
|
if (info->hook_entry[i] &&
|
|
(e < (struct ip6t_entry *)(base + info->hook_entry[i])))
|
|
newinfo->hook_entry[i] -= off;
|
|
if (info->underflow[i] &&
|
|
(e < (struct ip6t_entry *)(base + info->underflow[i])))
|
|
newinfo->underflow[i] -= off;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int compat_table_info(const struct xt_table_info *info,
|
|
struct xt_table_info *newinfo)
|
|
{
|
|
struct ip6t_entry *iter;
|
|
void *loc_cpu_entry;
|
|
int ret;
|
|
|
|
if (!newinfo || !info)
|
|
return -EINVAL;
|
|
|
|
/* we dont care about newinfo->entries[] */
|
|
memcpy(newinfo, info, offsetof(struct xt_table_info, entries));
|
|
newinfo->initial_entries = 0;
|
|
loc_cpu_entry = info->entries[raw_smp_processor_id()];
|
|
xt_entry_foreach(iter, loc_cpu_entry, info->size) {
|
|
ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo);
|
|
if (ret != 0)
|
|
return ret;
|
|
}
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int get_info(struct net *net, void __user *user,
|
|
const int *len, int compat)
|
|
{
|
|
char name[IP6T_TABLE_MAXNAMELEN];
|
|
struct xt_table *t;
|
|
int ret;
|
|
|
|
if (*len != sizeof(struct ip6t_getinfo)) {
|
|
duprintf("length %u != %zu\n", *len,
|
|
sizeof(struct ip6t_getinfo));
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (copy_from_user(name, user, sizeof(name)) != 0)
|
|
return -EFAULT;
|
|
|
|
name[IP6T_TABLE_MAXNAMELEN-1] = '\0';
|
|
#ifdef CONFIG_COMPAT
|
|
if (compat)
|
|
xt_compat_lock(AF_INET6);
|
|
#endif
|
|
t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name),
|
|
"ip6table_%s", name);
|
|
if (t && !IS_ERR(t)) {
|
|
struct ip6t_getinfo info;
|
|
const struct xt_table_info *private = t->private;
|
|
#ifdef CONFIG_COMPAT
|
|
struct xt_table_info tmp;
|
|
|
|
if (compat) {
|
|
ret = compat_table_info(private, &tmp);
|
|
xt_compat_flush_offsets(AF_INET6);
|
|
private = &tmp;
|
|
}
|
|
#endif
|
|
info.valid_hooks = t->valid_hooks;
|
|
memcpy(info.hook_entry, private->hook_entry,
|
|
sizeof(info.hook_entry));
|
|
memcpy(info.underflow, private->underflow,
|
|
sizeof(info.underflow));
|
|
info.num_entries = private->number;
|
|
info.size = private->size;
|
|
strcpy(info.name, name);
|
|
|
|
if (copy_to_user(user, &info, *len) != 0)
|
|
ret = -EFAULT;
|
|
else
|
|
ret = 0;
|
|
|
|
xt_table_unlock(t);
|
|
module_put(t->me);
|
|
} else
|
|
ret = t ? PTR_ERR(t) : -ENOENT;
|
|
#ifdef CONFIG_COMPAT
|
|
if (compat)
|
|
xt_compat_unlock(AF_INET6);
|
|
#endif
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
get_entries(struct net *net, struct ip6t_get_entries __user *uptr,
|
|
const int *len)
|
|
{
|
|
int ret;
|
|
struct ip6t_get_entries get;
|
|
struct xt_table *t;
|
|
|
|
if (*len < sizeof(get)) {
|
|
duprintf("get_entries: %u < %zu\n", *len, sizeof(get));
|
|
return -EINVAL;
|
|
}
|
|
if (copy_from_user(&get, uptr, sizeof(get)) != 0)
|
|
return -EFAULT;
|
|
if (*len != sizeof(struct ip6t_get_entries) + get.size) {
|
|
duprintf("get_entries: %u != %zu\n",
|
|
*len, sizeof(get) + get.size);
|
|
return -EINVAL;
|
|
}
|
|
|
|
t = xt_find_table_lock(net, AF_INET6, get.name);
|
|
if (t && !IS_ERR(t)) {
|
|
struct xt_table_info *private = t->private;
|
|
duprintf("t->private->number = %u\n", private->number);
|
|
if (get.size == private->size)
|
|
ret = copy_entries_to_user(private->size,
|
|
t, uptr->entrytable);
|
|
else {
|
|
duprintf("get_entries: I've got %u not %u!\n",
|
|
private->size, get.size);
|
|
ret = -EAGAIN;
|
|
}
|
|
module_put(t->me);
|
|
xt_table_unlock(t);
|
|
} else
|
|
ret = t ? PTR_ERR(t) : -ENOENT;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
__do_replace(struct net *net, const char *name, unsigned int valid_hooks,
|
|
struct xt_table_info *newinfo, unsigned int num_counters,
|
|
void __user *counters_ptr)
|
|
{
|
|
int ret;
|
|
struct xt_table *t;
|
|
struct xt_table_info *oldinfo;
|
|
struct xt_counters *counters;
|
|
const void *loc_cpu_old_entry;
|
|
struct ip6t_entry *iter;
|
|
|
|
ret = 0;
|
|
counters = vmalloc_node(num_counters * sizeof(struct xt_counters),
|
|
numa_node_id());
|
|
if (!counters) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name),
|
|
"ip6table_%s", name);
|
|
if (!t || IS_ERR(t)) {
|
|
ret = t ? PTR_ERR(t) : -ENOENT;
|
|
goto free_newinfo_counters_untrans;
|
|
}
|
|
|
|
/* You lied! */
|
|
if (valid_hooks != t->valid_hooks) {
|
|
duprintf("Valid hook crap: %08X vs %08X\n",
|
|
valid_hooks, t->valid_hooks);
|
|
ret = -EINVAL;
|
|
goto put_module;
|
|
}
|
|
|
|
oldinfo = xt_replace_table(t, num_counters, newinfo, &ret);
|
|
if (!oldinfo)
|
|
goto put_module;
|
|
|
|
/* Update module usage count based on number of rules */
|
|
duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n",
|
|
oldinfo->number, oldinfo->initial_entries, newinfo->number);
|
|
if ((oldinfo->number > oldinfo->initial_entries) ||
|
|
(newinfo->number <= oldinfo->initial_entries))
|
|
module_put(t->me);
|
|
if ((oldinfo->number > oldinfo->initial_entries) &&
|
|
(newinfo->number <= oldinfo->initial_entries))
|
|
module_put(t->me);
|
|
|
|
/* Get the old counters, and synchronize with replace */
|
|
get_counters(oldinfo, counters);
|
|
|
|
/* Decrease module usage counts and free resource */
|
|
loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()];
|
|
xt_entry_foreach(iter, loc_cpu_old_entry, oldinfo->size)
|
|
cleanup_entry(iter, net);
|
|
|
|
xt_free_table_info(oldinfo);
|
|
if (copy_to_user(counters_ptr, counters,
|
|
sizeof(struct xt_counters) * num_counters) != 0)
|
|
ret = -EFAULT;
|
|
vfree(counters);
|
|
xt_table_unlock(t);
|
|
return ret;
|
|
|
|
put_module:
|
|
module_put(t->me);
|
|
xt_table_unlock(t);
|
|
free_newinfo_counters_untrans:
|
|
vfree(counters);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
do_replace(struct net *net, const void __user *user, unsigned int len)
|
|
{
|
|
int ret;
|
|
struct ip6t_replace tmp;
|
|
struct xt_table_info *newinfo;
|
|
void *loc_cpu_entry;
|
|
struct ip6t_entry *iter;
|
|
|
|
if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
|
|
return -EFAULT;
|
|
|
|
/* overflow check */
|
|
if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
|
|
return -ENOMEM;
|
|
|
|
newinfo = xt_alloc_table_info(tmp.size);
|
|
if (!newinfo)
|
|
return -ENOMEM;
|
|
|
|
/* choose the copy that is on our node/cpu */
|
|
loc_cpu_entry = newinfo->entries[raw_smp_processor_id()];
|
|
if (copy_from_user(loc_cpu_entry, user + sizeof(tmp),
|
|
tmp.size) != 0) {
|
|
ret = -EFAULT;
|
|
goto free_newinfo;
|
|
}
|
|
|
|
ret = translate_table(net, newinfo, loc_cpu_entry, &tmp);
|
|
if (ret != 0)
|
|
goto free_newinfo;
|
|
|
|
duprintf("ip_tables: Translated table\n");
|
|
|
|
ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo,
|
|
tmp.num_counters, tmp.counters);
|
|
if (ret)
|
|
goto free_newinfo_untrans;
|
|
return 0;
|
|
|
|
free_newinfo_untrans:
|
|
xt_entry_foreach(iter, loc_cpu_entry, newinfo->size)
|
|
cleanup_entry(iter, net);
|
|
free_newinfo:
|
|
xt_free_table_info(newinfo);
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
do_add_counters(struct net *net, const void __user *user, unsigned int len,
|
|
int compat)
|
|
{
|
|
unsigned int i, curcpu;
|
|
struct xt_counters_info tmp;
|
|
struct xt_counters *paddc;
|
|
unsigned int num_counters;
|
|
char *name;
|
|
int size;
|
|
void *ptmp;
|
|
struct xt_table *t;
|
|
const struct xt_table_info *private;
|
|
int ret = 0;
|
|
const void *loc_cpu_entry;
|
|
struct ip6t_entry *iter;
|
|
#ifdef CONFIG_COMPAT
|
|
struct compat_xt_counters_info compat_tmp;
|
|
|
|
if (compat) {
|
|
ptmp = &compat_tmp;
|
|
size = sizeof(struct compat_xt_counters_info);
|
|
} else
|
|
#endif
|
|
{
|
|
ptmp = &tmp;
|
|
size = sizeof(struct xt_counters_info);
|
|
}
|
|
|
|
if (copy_from_user(ptmp, user, size) != 0)
|
|
return -EFAULT;
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
if (compat) {
|
|
num_counters = compat_tmp.num_counters;
|
|
name = compat_tmp.name;
|
|
} else
|
|
#endif
|
|
{
|
|
num_counters = tmp.num_counters;
|
|
name = tmp.name;
|
|
}
|
|
|
|
if (len != size + num_counters * sizeof(struct xt_counters))
|
|
return -EINVAL;
|
|
|
|
paddc = vmalloc_node(len - size, numa_node_id());
|
|
if (!paddc)
|
|
return -ENOMEM;
|
|
|
|
if (copy_from_user(paddc, user + size, len - size) != 0) {
|
|
ret = -EFAULT;
|
|
goto free;
|
|
}
|
|
|
|
t = xt_find_table_lock(net, AF_INET6, name);
|
|
if (!t || IS_ERR(t)) {
|
|
ret = t ? PTR_ERR(t) : -ENOENT;
|
|
goto free;
|
|
}
|
|
|
|
|
|
local_bh_disable();
|
|
private = t->private;
|
|
if (private->number != num_counters) {
|
|
ret = -EINVAL;
|
|
goto unlock_up_free;
|
|
}
|
|
|
|
i = 0;
|
|
/* Choose the copy that is on our node */
|
|
curcpu = smp_processor_id();
|
|
xt_info_wrlock(curcpu);
|
|
loc_cpu_entry = private->entries[curcpu];
|
|
xt_entry_foreach(iter, loc_cpu_entry, private->size) {
|
|
ADD_COUNTER(iter->counters, paddc[i].bcnt, paddc[i].pcnt);
|
|
++i;
|
|
}
|
|
xt_info_wrunlock(curcpu);
|
|
|
|
unlock_up_free:
|
|
local_bh_enable();
|
|
xt_table_unlock(t);
|
|
module_put(t->me);
|
|
free:
|
|
vfree(paddc);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
struct compat_ip6t_replace {
|
|
char name[IP6T_TABLE_MAXNAMELEN];
|
|
u32 valid_hooks;
|
|
u32 num_entries;
|
|
u32 size;
|
|
u32 hook_entry[NF_INET_NUMHOOKS];
|
|
u32 underflow[NF_INET_NUMHOOKS];
|
|
u32 num_counters;
|
|
compat_uptr_t counters; /* struct ip6t_counters * */
|
|
struct compat_ip6t_entry entries[0];
|
|
};
|
|
|
|
static int
|
|
compat_copy_entry_to_user(struct ip6t_entry *e, void __user **dstptr,
|
|
unsigned int *size, struct xt_counters *counters,
|
|
unsigned int i)
|
|
{
|
|
struct ip6t_entry_target *t;
|
|
struct compat_ip6t_entry __user *ce;
|
|
u_int16_t target_offset, next_offset;
|
|
compat_uint_t origsize;
|
|
const struct xt_entry_match *ematch;
|
|
int ret = 0;
|
|
|
|
origsize = *size;
|
|
ce = (struct compat_ip6t_entry __user *)*dstptr;
|
|
if (copy_to_user(ce, e, sizeof(struct ip6t_entry)) != 0 ||
|
|
copy_to_user(&ce->counters, &counters[i],
|
|
sizeof(counters[i])) != 0)
|
|
return -EFAULT;
|
|
|
|
*dstptr += sizeof(struct compat_ip6t_entry);
|
|
*size -= sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
|
|
|
|
xt_ematch_foreach(ematch, e) {
|
|
ret = xt_compat_match_to_user(ematch, dstptr, size);
|
|
if (ret != 0)
|
|
return ret;
|
|
}
|
|
target_offset = e->target_offset - (origsize - *size);
|
|
t = ip6t_get_target(e);
|
|
ret = xt_compat_target_to_user(t, dstptr, size);
|
|
if (ret)
|
|
return ret;
|
|
next_offset = e->next_offset - (origsize - *size);
|
|
if (put_user(target_offset, &ce->target_offset) != 0 ||
|
|
put_user(next_offset, &ce->next_offset) != 0)
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
compat_find_calc_match(struct ip6t_entry_match *m,
|
|
const char *name,
|
|
const struct ip6t_ip6 *ipv6,
|
|
unsigned int hookmask,
|
|
int *size)
|
|
{
|
|
struct xt_match *match;
|
|
|
|
match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name,
|
|
m->u.user.revision);
|
|
if (IS_ERR(match)) {
|
|
duprintf("compat_check_calc_match: `%s' not found\n",
|
|
m->u.user.name);
|
|
return PTR_ERR(match);
|
|
}
|
|
m->u.kernel.match = match;
|
|
*size += xt_compat_match_offset(match);
|
|
return 0;
|
|
}
|
|
|
|
static void compat_release_entry(struct compat_ip6t_entry *e)
|
|
{
|
|
struct ip6t_entry_target *t;
|
|
struct xt_entry_match *ematch;
|
|
|
|
/* Cleanup all matches */
|
|
xt_ematch_foreach(ematch, e)
|
|
module_put(ematch->u.kernel.match->me);
|
|
t = compat_ip6t_get_target(e);
|
|
module_put(t->u.kernel.target->me);
|
|
}
|
|
|
|
static int
|
|
check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e,
|
|
struct xt_table_info *newinfo,
|
|
unsigned int *size,
|
|
const unsigned char *base,
|
|
const unsigned char *limit,
|
|
const unsigned int *hook_entries,
|
|
const unsigned int *underflows,
|
|
const char *name)
|
|
{
|
|
struct xt_entry_match *ematch;
|
|
struct ip6t_entry_target *t;
|
|
struct xt_target *target;
|
|
unsigned int entry_offset;
|
|
unsigned int j;
|
|
int ret, off, h;
|
|
|
|
duprintf("check_compat_entry_size_and_hooks %p\n", e);
|
|
if ((unsigned long)e % __alignof__(struct compat_ip6t_entry) != 0 ||
|
|
(unsigned char *)e + sizeof(struct compat_ip6t_entry) >= limit) {
|
|
duprintf("Bad offset %p, limit = %p\n", e, limit);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (e->next_offset < sizeof(struct compat_ip6t_entry) +
|
|
sizeof(struct compat_xt_entry_target)) {
|
|
duprintf("checking: element %p size %u\n",
|
|
e, e->next_offset);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* For purposes of check_entry casting the compat entry is fine */
|
|
ret = check_entry((struct ip6t_entry *)e, name);
|
|
if (ret)
|
|
return ret;
|
|
|
|
off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
|
|
entry_offset = (void *)e - (void *)base;
|
|
j = 0;
|
|
xt_ematch_foreach(ematch, e) {
|
|
ret = compat_find_calc_match(ematch, name,
|
|
&e->ipv6, e->comefrom, &off);
|
|
if (ret != 0)
|
|
goto release_matches;
|
|
++j;
|
|
}
|
|
|
|
t = compat_ip6t_get_target(e);
|
|
target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name,
|
|
t->u.user.revision);
|
|
if (IS_ERR(target)) {
|
|
duprintf("check_compat_entry_size_and_hooks: `%s' not found\n",
|
|
t->u.user.name);
|
|
ret = PTR_ERR(target);
|
|
goto release_matches;
|
|
}
|
|
t->u.kernel.target = target;
|
|
|
|
off += xt_compat_target_offset(target);
|
|
*size += off;
|
|
ret = xt_compat_add_offset(AF_INET6, entry_offset, off);
|
|
if (ret)
|
|
goto out;
|
|
|
|
/* Check hooks & underflows */
|
|
for (h = 0; h < NF_INET_NUMHOOKS; h++) {
|
|
if ((unsigned char *)e - base == hook_entries[h])
|
|
newinfo->hook_entry[h] = hook_entries[h];
|
|
if ((unsigned char *)e - base == underflows[h])
|
|
newinfo->underflow[h] = underflows[h];
|
|
}
|
|
|
|
/* Clear counters and comefrom */
|
|
memset(&e->counters, 0, sizeof(e->counters));
|
|
e->comefrom = 0;
|
|
return 0;
|
|
|
|
out:
|
|
module_put(t->u.kernel.target->me);
|
|
release_matches:
|
|
xt_ematch_foreach(ematch, e) {
|
|
if (j-- == 0)
|
|
break;
|
|
module_put(ematch->u.kernel.match->me);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr,
|
|
unsigned int *size, const char *name,
|
|
struct xt_table_info *newinfo, unsigned char *base)
|
|
{
|
|
struct ip6t_entry_target *t;
|
|
struct xt_target *target;
|
|
struct ip6t_entry *de;
|
|
unsigned int origsize;
|
|
int ret, h;
|
|
struct xt_entry_match *ematch;
|
|
|
|
ret = 0;
|
|
origsize = *size;
|
|
de = (struct ip6t_entry *)*dstptr;
|
|
memcpy(de, e, sizeof(struct ip6t_entry));
|
|
memcpy(&de->counters, &e->counters, sizeof(e->counters));
|
|
|
|
*dstptr += sizeof(struct ip6t_entry);
|
|
*size += sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
|
|
|
|
xt_ematch_foreach(ematch, e) {
|
|
ret = xt_compat_match_from_user(ematch, dstptr, size);
|
|
if (ret != 0)
|
|
return ret;
|
|
}
|
|
de->target_offset = e->target_offset - (origsize - *size);
|
|
t = compat_ip6t_get_target(e);
|
|
target = t->u.kernel.target;
|
|
xt_compat_target_from_user(t, dstptr, size);
|
|
|
|
de->next_offset = e->next_offset - (origsize - *size);
|
|
for (h = 0; h < NF_INET_NUMHOOKS; h++) {
|
|
if ((unsigned char *)de - base < newinfo->hook_entry[h])
|
|
newinfo->hook_entry[h] -= origsize - *size;
|
|
if ((unsigned char *)de - base < newinfo->underflow[h])
|
|
newinfo->underflow[h] -= origsize - *size;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int compat_check_entry(struct ip6t_entry *e, struct net *net,
|
|
const char *name)
|
|
{
|
|
unsigned int j;
|
|
int ret = 0;
|
|
struct xt_mtchk_param mtpar;
|
|
struct xt_entry_match *ematch;
|
|
|
|
j = 0;
|
|
mtpar.net = net;
|
|
mtpar.table = name;
|
|
mtpar.entryinfo = &e->ipv6;
|
|
mtpar.hook_mask = e->comefrom;
|
|
mtpar.family = NFPROTO_IPV6;
|
|
xt_ematch_foreach(ematch, e) {
|
|
ret = check_match(ematch, &mtpar);
|
|
if (ret != 0)
|
|
goto cleanup_matches;
|
|
++j;
|
|
}
|
|
|
|
ret = check_target(e, net, name);
|
|
if (ret)
|
|
goto cleanup_matches;
|
|
return 0;
|
|
|
|
cleanup_matches:
|
|
xt_ematch_foreach(ematch, e) {
|
|
if (j-- == 0)
|
|
break;
|
|
cleanup_match(ematch, net);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
translate_compat_table(struct net *net,
|
|
const char *name,
|
|
unsigned int valid_hooks,
|
|
struct xt_table_info **pinfo,
|
|
void **pentry0,
|
|
unsigned int total_size,
|
|
unsigned int number,
|
|
unsigned int *hook_entries,
|
|
unsigned int *underflows)
|
|
{
|
|
unsigned int i, j;
|
|
struct xt_table_info *newinfo, *info;
|
|
void *pos, *entry0, *entry1;
|
|
struct compat_ip6t_entry *iter0;
|
|
struct ip6t_entry *iter1;
|
|
unsigned int size;
|
|
int ret = 0;
|
|
|
|
info = *pinfo;
|
|
entry0 = *pentry0;
|
|
size = total_size;
|
|
info->number = number;
|
|
|
|
/* Init all hooks to impossible value. */
|
|
for (i = 0; i < NF_INET_NUMHOOKS; i++) {
|
|
info->hook_entry[i] = 0xFFFFFFFF;
|
|
info->underflow[i] = 0xFFFFFFFF;
|
|
}
|
|
|
|
duprintf("translate_compat_table: size %u\n", info->size);
|
|
j = 0;
|
|
xt_compat_lock(AF_INET6);
|
|
/* Walk through entries, checking offsets. */
|
|
xt_entry_foreach(iter0, entry0, total_size) {
|
|
ret = check_compat_entry_size_and_hooks(iter0, info, &size,
|
|
entry0,
|
|
entry0 + total_size,
|
|
hook_entries,
|
|
underflows,
|
|
name);
|
|
if (ret != 0)
|
|
goto out_unlock;
|
|
++j;
|
|
}
|
|
|
|
ret = -EINVAL;
|
|
if (j != number) {
|
|
duprintf("translate_compat_table: %u not %u entries\n",
|
|
j, number);
|
|
goto out_unlock;
|
|
}
|
|
|
|
/* Check hooks all assigned */
|
|
for (i = 0; i < NF_INET_NUMHOOKS; i++) {
|
|
/* Only hooks which are valid */
|
|
if (!(valid_hooks & (1 << i)))
|
|
continue;
|
|
if (info->hook_entry[i] == 0xFFFFFFFF) {
|
|
duprintf("Invalid hook entry %u %u\n",
|
|
i, hook_entries[i]);
|
|
goto out_unlock;
|
|
}
|
|
if (info->underflow[i] == 0xFFFFFFFF) {
|
|
duprintf("Invalid underflow %u %u\n",
|
|
i, underflows[i]);
|
|
goto out_unlock;
|
|
}
|
|
}
|
|
|
|
ret = -ENOMEM;
|
|
newinfo = xt_alloc_table_info(size);
|
|
if (!newinfo)
|
|
goto out_unlock;
|
|
|
|
newinfo->number = number;
|
|
for (i = 0; i < NF_INET_NUMHOOKS; i++) {
|
|
newinfo->hook_entry[i] = info->hook_entry[i];
|
|
newinfo->underflow[i] = info->underflow[i];
|
|
}
|
|
entry1 = newinfo->entries[raw_smp_processor_id()];
|
|
pos = entry1;
|
|
size = total_size;
|
|
xt_entry_foreach(iter0, entry0, total_size) {
|
|
ret = compat_copy_entry_from_user(iter0, &pos, &size,
|
|
name, newinfo, entry1);
|
|
if (ret != 0)
|
|
break;
|
|
}
|
|
xt_compat_flush_offsets(AF_INET6);
|
|
xt_compat_unlock(AF_INET6);
|
|
if (ret)
|
|
goto free_newinfo;
|
|
|
|
ret = -ELOOP;
|
|
if (!mark_source_chains(newinfo, valid_hooks, entry1))
|
|
goto free_newinfo;
|
|
|
|
i = 0;
|
|
xt_entry_foreach(iter1, entry1, newinfo->size) {
|
|
ret = compat_check_entry(iter1, net, name);
|
|
if (ret != 0)
|
|
break;
|
|
++i;
|
|
}
|
|
if (ret) {
|
|
/*
|
|
* The first i matches need cleanup_entry (calls ->destroy)
|
|
* because they had called ->check already. The other j-i
|
|
* entries need only release.
|
|
*/
|
|
int skip = i;
|
|
j -= i;
|
|
xt_entry_foreach(iter0, entry0, newinfo->size) {
|
|
if (skip-- > 0)
|
|
continue;
|
|
if (j-- == 0)
|
|
break;
|
|
compat_release_entry(iter0);
|
|
}
|
|
xt_entry_foreach(iter1, entry1, newinfo->size) {
|
|
if (i-- == 0)
|
|
break;
|
|
cleanup_entry(iter1, net);
|
|
}
|
|
xt_free_table_info(newinfo);
|
|
return ret;
|
|
}
|
|
|
|
/* And one copy for every other CPU */
|
|
for_each_possible_cpu(i)
|
|
if (newinfo->entries[i] && newinfo->entries[i] != entry1)
|
|
memcpy(newinfo->entries[i], entry1, newinfo->size);
|
|
|
|
*pinfo = newinfo;
|
|
*pentry0 = entry1;
|
|
xt_free_table_info(info);
|
|
return 0;
|
|
|
|
free_newinfo:
|
|
xt_free_table_info(newinfo);
|
|
out:
|
|
xt_entry_foreach(iter0, entry0, total_size) {
|
|
if (j-- == 0)
|
|
break;
|
|
compat_release_entry(iter0);
|
|
}
|
|
return ret;
|
|
out_unlock:
|
|
xt_compat_flush_offsets(AF_INET6);
|
|
xt_compat_unlock(AF_INET6);
|
|
goto out;
|
|
}
|
|
|
|
static int
|
|
compat_do_replace(struct net *net, void __user *user, unsigned int len)
|
|
{
|
|
int ret;
|
|
struct compat_ip6t_replace tmp;
|
|
struct xt_table_info *newinfo;
|
|
void *loc_cpu_entry;
|
|
struct ip6t_entry *iter;
|
|
|
|
if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
|
|
return -EFAULT;
|
|
|
|
/* overflow check */
|
|
if (tmp.size >= INT_MAX / num_possible_cpus())
|
|
return -ENOMEM;
|
|
if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
|
|
return -ENOMEM;
|
|
|
|
newinfo = xt_alloc_table_info(tmp.size);
|
|
if (!newinfo)
|
|
return -ENOMEM;
|
|
|
|
/* choose the copy that is on our node/cpu */
|
|
loc_cpu_entry = newinfo->entries[raw_smp_processor_id()];
|
|
if (copy_from_user(loc_cpu_entry, user + sizeof(tmp),
|
|
tmp.size) != 0) {
|
|
ret = -EFAULT;
|
|
goto free_newinfo;
|
|
}
|
|
|
|
ret = translate_compat_table(net, tmp.name, tmp.valid_hooks,
|
|
&newinfo, &loc_cpu_entry, tmp.size,
|
|
tmp.num_entries, tmp.hook_entry,
|
|
tmp.underflow);
|
|
if (ret != 0)
|
|
goto free_newinfo;
|
|
|
|
duprintf("compat_do_replace: Translated table\n");
|
|
|
|
ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo,
|
|
tmp.num_counters, compat_ptr(tmp.counters));
|
|
if (ret)
|
|
goto free_newinfo_untrans;
|
|
return 0;
|
|
|
|
free_newinfo_untrans:
|
|
xt_entry_foreach(iter, loc_cpu_entry, newinfo->size)
|
|
cleanup_entry(iter, net);
|
|
free_newinfo:
|
|
xt_free_table_info(newinfo);
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
compat_do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user,
|
|
unsigned int len)
|
|
{
|
|
int ret;
|
|
|
|
if (!capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
switch (cmd) {
|
|
case IP6T_SO_SET_REPLACE:
|
|
ret = compat_do_replace(sock_net(sk), user, len);
|
|
break;
|
|
|
|
case IP6T_SO_SET_ADD_COUNTERS:
|
|
ret = do_add_counters(sock_net(sk), user, len, 1);
|
|
break;
|
|
|
|
default:
|
|
duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd);
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
struct compat_ip6t_get_entries {
|
|
char name[IP6T_TABLE_MAXNAMELEN];
|
|
compat_uint_t size;
|
|
struct compat_ip6t_entry entrytable[0];
|
|
};
|
|
|
|
static int
|
|
compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table,
|
|
void __user *userptr)
|
|
{
|
|
struct xt_counters *counters;
|
|
const struct xt_table_info *private = table->private;
|
|
void __user *pos;
|
|
unsigned int size;
|
|
int ret = 0;
|
|
const void *loc_cpu_entry;
|
|
unsigned int i = 0;
|
|
struct ip6t_entry *iter;
|
|
|
|
counters = alloc_counters(table);
|
|
if (IS_ERR(counters))
|
|
return PTR_ERR(counters);
|
|
|
|
/* choose the copy that is on our node/cpu, ...
|
|
* This choice is lazy (because current thread is
|
|
* allowed to migrate to another cpu)
|
|
*/
|
|
loc_cpu_entry = private->entries[raw_smp_processor_id()];
|
|
pos = userptr;
|
|
size = total_size;
|
|
xt_entry_foreach(iter, loc_cpu_entry, total_size) {
|
|
ret = compat_copy_entry_to_user(iter, &pos,
|
|
&size, counters, i++);
|
|
if (ret != 0)
|
|
break;
|
|
}
|
|
|
|
vfree(counters);
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
compat_get_entries(struct net *net, struct compat_ip6t_get_entries __user *uptr,
|
|
int *len)
|
|
{
|
|
int ret;
|
|
struct compat_ip6t_get_entries get;
|
|
struct xt_table *t;
|
|
|
|
if (*len < sizeof(get)) {
|
|
duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get));
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (copy_from_user(&get, uptr, sizeof(get)) != 0)
|
|
return -EFAULT;
|
|
|
|
if (*len != sizeof(struct compat_ip6t_get_entries) + get.size) {
|
|
duprintf("compat_get_entries: %u != %zu\n",
|
|
*len, sizeof(get) + get.size);
|
|
return -EINVAL;
|
|
}
|
|
|
|
xt_compat_lock(AF_INET6);
|
|
t = xt_find_table_lock(net, AF_INET6, get.name);
|
|
if (t && !IS_ERR(t)) {
|
|
const struct xt_table_info *private = t->private;
|
|
struct xt_table_info info;
|
|
duprintf("t->private->number = %u\n", private->number);
|
|
ret = compat_table_info(private, &info);
|
|
if (!ret && get.size == info.size) {
|
|
ret = compat_copy_entries_to_user(private->size,
|
|
t, uptr->entrytable);
|
|
} else if (!ret) {
|
|
duprintf("compat_get_entries: I've got %u not %u!\n",
|
|
private->size, get.size);
|
|
ret = -EAGAIN;
|
|
}
|
|
xt_compat_flush_offsets(AF_INET6);
|
|
module_put(t->me);
|
|
xt_table_unlock(t);
|
|
} else
|
|
ret = t ? PTR_ERR(t) : -ENOENT;
|
|
|
|
xt_compat_unlock(AF_INET6);
|
|
return ret;
|
|
}
|
|
|
|
static int do_ip6t_get_ctl(struct sock *, int, void __user *, int *);
|
|
|
|
static int
|
|
compat_do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
|
|
{
|
|
int ret;
|
|
|
|
if (!capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
switch (cmd) {
|
|
case IP6T_SO_GET_INFO:
|
|
ret = get_info(sock_net(sk), user, len, 1);
|
|
break;
|
|
case IP6T_SO_GET_ENTRIES:
|
|
ret = compat_get_entries(sock_net(sk), user, len);
|
|
break;
|
|
default:
|
|
ret = do_ip6t_get_ctl(sk, cmd, user, len);
|
|
}
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
static int
|
|
do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
|
|
{
|
|
int ret;
|
|
|
|
if (!capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
switch (cmd) {
|
|
case IP6T_SO_SET_REPLACE:
|
|
ret = do_replace(sock_net(sk), user, len);
|
|
break;
|
|
|
|
case IP6T_SO_SET_ADD_COUNTERS:
|
|
ret = do_add_counters(sock_net(sk), user, len, 0);
|
|
break;
|
|
|
|
default:
|
|
duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd);
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
|
|
{
|
|
int ret;
|
|
|
|
if (!capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
switch (cmd) {
|
|
case IP6T_SO_GET_INFO:
|
|
ret = get_info(sock_net(sk), user, len, 0);
|
|
break;
|
|
|
|
case IP6T_SO_GET_ENTRIES:
|
|
ret = get_entries(sock_net(sk), user, len);
|
|
break;
|
|
|
|
case IP6T_SO_GET_REVISION_MATCH:
|
|
case IP6T_SO_GET_REVISION_TARGET: {
|
|
struct ip6t_get_revision rev;
|
|
int target;
|
|
|
|
if (*len != sizeof(rev)) {
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
if (copy_from_user(&rev, user, sizeof(rev)) != 0) {
|
|
ret = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
if (cmd == IP6T_SO_GET_REVISION_TARGET)
|
|
target = 1;
|
|
else
|
|
target = 0;
|
|
|
|
try_then_request_module(xt_find_revision(AF_INET6, rev.name,
|
|
rev.revision,
|
|
target, &ret),
|
|
"ip6t_%s", rev.name);
|
|
break;
|
|
}
|
|
|
|
default:
|
|
duprintf("do_ip6t_get_ctl: unknown request %i\n", cmd);
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
struct xt_table *ip6t_register_table(struct net *net,
|
|
const struct xt_table *table,
|
|
const struct ip6t_replace *repl)
|
|
{
|
|
int ret;
|
|
struct xt_table_info *newinfo;
|
|
struct xt_table_info bootstrap = {0};
|
|
void *loc_cpu_entry;
|
|
struct xt_table *new_table;
|
|
|
|
newinfo = xt_alloc_table_info(repl->size);
|
|
if (!newinfo) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
/* choose the copy on our node/cpu, but dont care about preemption */
|
|
loc_cpu_entry = newinfo->entries[raw_smp_processor_id()];
|
|
memcpy(loc_cpu_entry, repl->entries, repl->size);
|
|
|
|
ret = translate_table(net, newinfo, loc_cpu_entry, repl);
|
|
if (ret != 0)
|
|
goto out_free;
|
|
|
|
new_table = xt_register_table(net, table, &bootstrap, newinfo);
|
|
if (IS_ERR(new_table)) {
|
|
ret = PTR_ERR(new_table);
|
|
goto out_free;
|
|
}
|
|
return new_table;
|
|
|
|
out_free:
|
|
xt_free_table_info(newinfo);
|
|
out:
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
void ip6t_unregister_table(struct net *net, struct xt_table *table)
|
|
{
|
|
struct xt_table_info *private;
|
|
void *loc_cpu_entry;
|
|
struct module *table_owner = table->me;
|
|
struct ip6t_entry *iter;
|
|
|
|
private = xt_unregister_table(table);
|
|
|
|
/* Decrease module usage counts and free resources */
|
|
loc_cpu_entry = private->entries[raw_smp_processor_id()];
|
|
xt_entry_foreach(iter, loc_cpu_entry, private->size)
|
|
cleanup_entry(iter, net);
|
|
if (private->number > private->initial_entries)
|
|
module_put(table_owner);
|
|
xt_free_table_info(private);
|
|
}
|
|
|
|
/* Returns 1 if the type and code is matched by the range, 0 otherwise */
|
|
static inline bool
|
|
icmp6_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code,
|
|
u_int8_t type, u_int8_t code,
|
|
bool invert)
|
|
{
|
|
return (type == test_type && code >= min_code && code <= max_code)
|
|
^ invert;
|
|
}
|
|
|
|
static bool
|
|
icmp6_match(const struct sk_buff *skb, struct xt_action_param *par)
|
|
{
|
|
const struct icmp6hdr *ic;
|
|
struct icmp6hdr _icmph;
|
|
const struct ip6t_icmp *icmpinfo = par->matchinfo;
|
|
|
|
/* Must not be a fragment. */
|
|
if (par->fragoff != 0)
|
|
return false;
|
|
|
|
ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph);
|
|
if (ic == NULL) {
|
|
/* We've been asked to examine this packet, and we
|
|
* can't. Hence, no choice but to drop.
|
|
*/
|
|
duprintf("Dropping evil ICMP tinygram.\n");
|
|
par->hotdrop = true;
|
|
return false;
|
|
}
|
|
|
|
return icmp6_type_code_match(icmpinfo->type,
|
|
icmpinfo->code[0],
|
|
icmpinfo->code[1],
|
|
ic->icmp6_type, ic->icmp6_code,
|
|
!!(icmpinfo->invflags&IP6T_ICMP_INV));
|
|
}
|
|
|
|
/* Called when user tries to insert an entry of this type. */
|
|
static int icmp6_checkentry(const struct xt_mtchk_param *par)
|
|
{
|
|
const struct ip6t_icmp *icmpinfo = par->matchinfo;
|
|
|
|
/* Must specify no unknown invflags */
|
|
return (icmpinfo->invflags & ~IP6T_ICMP_INV) ? -EINVAL : 0;
|
|
}
|
|
|
|
/* The built-in targets: standard (NULL) and error. */
|
|
static struct xt_target ip6t_standard_target __read_mostly = {
|
|
.name = IP6T_STANDARD_TARGET,
|
|
.targetsize = sizeof(int),
|
|
.family = NFPROTO_IPV6,
|
|
#ifdef CONFIG_COMPAT
|
|
.compatsize = sizeof(compat_int_t),
|
|
.compat_from_user = compat_standard_from_user,
|
|
.compat_to_user = compat_standard_to_user,
|
|
#endif
|
|
};
|
|
|
|
static struct xt_target ip6t_error_target __read_mostly = {
|
|
.name = IP6T_ERROR_TARGET,
|
|
.target = ip6t_error,
|
|
.targetsize = IP6T_FUNCTION_MAXNAMELEN,
|
|
.family = NFPROTO_IPV6,
|
|
};
|
|
|
|
static struct nf_sockopt_ops ip6t_sockopts = {
|
|
.pf = PF_INET6,
|
|
.set_optmin = IP6T_BASE_CTL,
|
|
.set_optmax = IP6T_SO_SET_MAX+1,
|
|
.set = do_ip6t_set_ctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_set = compat_do_ip6t_set_ctl,
|
|
#endif
|
|
.get_optmin = IP6T_BASE_CTL,
|
|
.get_optmax = IP6T_SO_GET_MAX+1,
|
|
.get = do_ip6t_get_ctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_get = compat_do_ip6t_get_ctl,
|
|
#endif
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static struct xt_match icmp6_matchstruct __read_mostly = {
|
|
.name = "icmp6",
|
|
.match = icmp6_match,
|
|
.matchsize = sizeof(struct ip6t_icmp),
|
|
.checkentry = icmp6_checkentry,
|
|
.proto = IPPROTO_ICMPV6,
|
|
.family = NFPROTO_IPV6,
|
|
};
|
|
|
|
static int __net_init ip6_tables_net_init(struct net *net)
|
|
{
|
|
return xt_proto_init(net, NFPROTO_IPV6);
|
|
}
|
|
|
|
static void __net_exit ip6_tables_net_exit(struct net *net)
|
|
{
|
|
xt_proto_fini(net, NFPROTO_IPV6);
|
|
}
|
|
|
|
static struct pernet_operations ip6_tables_net_ops = {
|
|
.init = ip6_tables_net_init,
|
|
.exit = ip6_tables_net_exit,
|
|
};
|
|
|
|
static int __init ip6_tables_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = register_pernet_subsys(&ip6_tables_net_ops);
|
|
if (ret < 0)
|
|
goto err1;
|
|
|
|
/* Noone else will be downing sem now, so we won't sleep */
|
|
ret = xt_register_target(&ip6t_standard_target);
|
|
if (ret < 0)
|
|
goto err2;
|
|
ret = xt_register_target(&ip6t_error_target);
|
|
if (ret < 0)
|
|
goto err3;
|
|
ret = xt_register_match(&icmp6_matchstruct);
|
|
if (ret < 0)
|
|
goto err4;
|
|
|
|
/* Register setsockopt */
|
|
ret = nf_register_sockopt(&ip6t_sockopts);
|
|
if (ret < 0)
|
|
goto err5;
|
|
|
|
pr_info("(C) 2000-2006 Netfilter Core Team\n");
|
|
return 0;
|
|
|
|
err5:
|
|
xt_unregister_match(&icmp6_matchstruct);
|
|
err4:
|
|
xt_unregister_target(&ip6t_error_target);
|
|
err3:
|
|
xt_unregister_target(&ip6t_standard_target);
|
|
err2:
|
|
unregister_pernet_subsys(&ip6_tables_net_ops);
|
|
err1:
|
|
return ret;
|
|
}
|
|
|
|
static void __exit ip6_tables_fini(void)
|
|
{
|
|
nf_unregister_sockopt(&ip6t_sockopts);
|
|
|
|
xt_unregister_match(&icmp6_matchstruct);
|
|
xt_unregister_target(&ip6t_error_target);
|
|
xt_unregister_target(&ip6t_standard_target);
|
|
|
|
unregister_pernet_subsys(&ip6_tables_net_ops);
|
|
}
|
|
|
|
/*
|
|
* find the offset to specified header or the protocol number of last header
|
|
* if target < 0. "last header" is transport protocol header, ESP, or
|
|
* "No next header".
|
|
*
|
|
* If target header is found, its offset is set in *offset and return protocol
|
|
* number. Otherwise, return -1.
|
|
*
|
|
* If the first fragment doesn't contain the final protocol header or
|
|
* NEXTHDR_NONE it is considered invalid.
|
|
*
|
|
* Note that non-1st fragment is special case that "the protocol number
|
|
* of last header" is "next header" field in Fragment header. In this case,
|
|
* *offset is meaningless and fragment offset is stored in *fragoff if fragoff
|
|
* isn't NULL.
|
|
*
|
|
*/
|
|
int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset,
|
|
int target, unsigned short *fragoff)
|
|
{
|
|
unsigned int start = skb_network_offset(skb) + sizeof(struct ipv6hdr);
|
|
u8 nexthdr = ipv6_hdr(skb)->nexthdr;
|
|
unsigned int len = skb->len - start;
|
|
|
|
if (fragoff)
|
|
*fragoff = 0;
|
|
|
|
while (nexthdr != target) {
|
|
struct ipv6_opt_hdr _hdr, *hp;
|
|
unsigned int hdrlen;
|
|
|
|
if ((!ipv6_ext_hdr(nexthdr)) || nexthdr == NEXTHDR_NONE) {
|
|
if (target < 0)
|
|
break;
|
|
return -ENOENT;
|
|
}
|
|
|
|
hp = skb_header_pointer(skb, start, sizeof(_hdr), &_hdr);
|
|
if (hp == NULL)
|
|
return -EBADMSG;
|
|
if (nexthdr == NEXTHDR_FRAGMENT) {
|
|
unsigned short _frag_off;
|
|
__be16 *fp;
|
|
fp = skb_header_pointer(skb,
|
|
start+offsetof(struct frag_hdr,
|
|
frag_off),
|
|
sizeof(_frag_off),
|
|
&_frag_off);
|
|
if (fp == NULL)
|
|
return -EBADMSG;
|
|
|
|
_frag_off = ntohs(*fp) & ~0x7;
|
|
if (_frag_off) {
|
|
if (target < 0 &&
|
|
((!ipv6_ext_hdr(hp->nexthdr)) ||
|
|
hp->nexthdr == NEXTHDR_NONE)) {
|
|
if (fragoff)
|
|
*fragoff = _frag_off;
|
|
return hp->nexthdr;
|
|
}
|
|
return -ENOENT;
|
|
}
|
|
hdrlen = 8;
|
|
} else if (nexthdr == NEXTHDR_AUTH)
|
|
hdrlen = (hp->hdrlen + 2) << 2;
|
|
else
|
|
hdrlen = ipv6_optlen(hp);
|
|
|
|
nexthdr = hp->nexthdr;
|
|
len -= hdrlen;
|
|
start += hdrlen;
|
|
}
|
|
|
|
*offset = start;
|
|
return nexthdr;
|
|
}
|
|
|
|
EXPORT_SYMBOL(ip6t_register_table);
|
|
EXPORT_SYMBOL(ip6t_unregister_table);
|
|
EXPORT_SYMBOL(ip6t_do_table);
|
|
EXPORT_SYMBOL(ip6t_ext_hdr);
|
|
EXPORT_SYMBOL(ipv6_find_hdr);
|
|
|
|
module_init(ip6_tables_init);
|
|
module_exit(ip6_tables_fini);
|