90e7d4ab5c
This adds a check that iptables's original author Rusty set forth in a FIXME comment. Underflows in iptables are better known as chain policies, and are required to be unconditional or there would be a stochastical chance for the policy rule to be skipped if it does not match. If that were to happen, rule execution would continue in an unexpected spurious fashion. Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
1923 lines
46 KiB
C
1923 lines
46 KiB
C
/*
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* Packet matching code for ARP packets.
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*
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* Based heavily, if not almost entirely, upon ip_tables.c framework.
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*
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* Some ARP specific bits are:
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*
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* Copyright (C) 2002 David S. Miller (davem@redhat.com)
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*
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <linux/capability.h>
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#include <linux/if_arp.h>
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#include <linux/kmod.h>
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#include <linux/vmalloc.h>
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#include <linux/proc_fs.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/mutex.h>
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#include <linux/err.h>
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#include <net/compat.h>
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#include <net/sock.h>
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#include <asm/uaccess.h>
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#include <linux/netfilter/x_tables.h>
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#include <linux/netfilter_arp/arp_tables.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("David S. Miller <davem@redhat.com>");
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MODULE_DESCRIPTION("arptables core");
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/*#define DEBUG_ARP_TABLES*/
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/*#define DEBUG_ARP_TABLES_USER*/
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#ifdef DEBUG_ARP_TABLES
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#define dprintf(format, args...) printk(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_ARP_TABLES_USER
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#define duprintf(format, args...) printk(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 ARP_NF_ASSERT(x) \
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do { \
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if (!(x)) \
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printk("ARP_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 ARP_NF_ASSERT(x)
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#endif
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static inline int arp_devaddr_compare(const struct arpt_devaddr_info *ap,
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const char *hdr_addr, int len)
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{
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int i, ret;
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if (len > ARPT_DEV_ADDR_LEN_MAX)
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len = ARPT_DEV_ADDR_LEN_MAX;
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ret = 0;
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for (i = 0; i < len; i++)
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ret |= (hdr_addr[i] ^ ap->addr[i]) & ap->mask[i];
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return (ret != 0);
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}
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/*
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* Unfortunatly, _b and _mask are not aligned to an int (or long int)
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* Some arches dont care, unrolling the loop is a win on them.
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* For other arches, we only have a 16bit alignement.
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*/
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static unsigned long ifname_compare(const char *_a, const char *_b, const char *_mask)
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{
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#ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
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unsigned long ret = ifname_compare_aligned(_a, _b, _mask);
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#else
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unsigned long ret = 0;
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const u16 *a = (const u16 *)_a;
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const u16 *b = (const u16 *)_b;
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const u16 *mask = (const u16 *)_mask;
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int i;
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for (i = 0; i < IFNAMSIZ/sizeof(u16); i++)
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ret |= (a[i] ^ b[i]) & mask[i];
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#endif
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return ret;
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}
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/* Returns whether packet matches rule or not. */
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static inline int arp_packet_match(const struct arphdr *arphdr,
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struct net_device *dev,
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const char *indev,
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const char *outdev,
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const struct arpt_arp *arpinfo)
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{
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const char *arpptr = (char *)(arphdr + 1);
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const char *src_devaddr, *tgt_devaddr;
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__be32 src_ipaddr, tgt_ipaddr;
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long ret;
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#define FWINV(bool, invflg) ((bool) ^ !!(arpinfo->invflags & (invflg)))
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if (FWINV((arphdr->ar_op & arpinfo->arpop_mask) != arpinfo->arpop,
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ARPT_INV_ARPOP)) {
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dprintf("ARP operation field mismatch.\n");
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dprintf("ar_op: %04x info->arpop: %04x info->arpop_mask: %04x\n",
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arphdr->ar_op, arpinfo->arpop, arpinfo->arpop_mask);
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return 0;
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}
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if (FWINV((arphdr->ar_hrd & arpinfo->arhrd_mask) != arpinfo->arhrd,
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ARPT_INV_ARPHRD)) {
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dprintf("ARP hardware address format mismatch.\n");
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dprintf("ar_hrd: %04x info->arhrd: %04x info->arhrd_mask: %04x\n",
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arphdr->ar_hrd, arpinfo->arhrd, arpinfo->arhrd_mask);
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return 0;
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}
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if (FWINV((arphdr->ar_pro & arpinfo->arpro_mask) != arpinfo->arpro,
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ARPT_INV_ARPPRO)) {
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dprintf("ARP protocol address format mismatch.\n");
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dprintf("ar_pro: %04x info->arpro: %04x info->arpro_mask: %04x\n",
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arphdr->ar_pro, arpinfo->arpro, arpinfo->arpro_mask);
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return 0;
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}
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if (FWINV((arphdr->ar_hln & arpinfo->arhln_mask) != arpinfo->arhln,
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ARPT_INV_ARPHLN)) {
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dprintf("ARP hardware address length mismatch.\n");
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dprintf("ar_hln: %02x info->arhln: %02x info->arhln_mask: %02x\n",
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arphdr->ar_hln, arpinfo->arhln, arpinfo->arhln_mask);
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return 0;
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}
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src_devaddr = arpptr;
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arpptr += dev->addr_len;
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memcpy(&src_ipaddr, arpptr, sizeof(u32));
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arpptr += sizeof(u32);
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tgt_devaddr = arpptr;
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arpptr += dev->addr_len;
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memcpy(&tgt_ipaddr, arpptr, sizeof(u32));
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if (FWINV(arp_devaddr_compare(&arpinfo->src_devaddr, src_devaddr, dev->addr_len),
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ARPT_INV_SRCDEVADDR) ||
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FWINV(arp_devaddr_compare(&arpinfo->tgt_devaddr, tgt_devaddr, dev->addr_len),
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ARPT_INV_TGTDEVADDR)) {
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dprintf("Source or target device address mismatch.\n");
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return 0;
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}
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if (FWINV((src_ipaddr & arpinfo->smsk.s_addr) != arpinfo->src.s_addr,
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ARPT_INV_SRCIP) ||
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FWINV(((tgt_ipaddr & arpinfo->tmsk.s_addr) != arpinfo->tgt.s_addr),
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ARPT_INV_TGTIP)) {
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dprintf("Source or target IP address mismatch.\n");
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dprintf("SRC: %pI4. Mask: %pI4. Target: %pI4.%s\n",
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&src_ipaddr,
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&arpinfo->smsk.s_addr,
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&arpinfo->src.s_addr,
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arpinfo->invflags & ARPT_INV_SRCIP ? " (INV)" : "");
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dprintf("TGT: %pI4 Mask: %pI4 Target: %pI4.%s\n",
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&tgt_ipaddr,
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&arpinfo->tmsk.s_addr,
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&arpinfo->tgt.s_addr,
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arpinfo->invflags & ARPT_INV_TGTIP ? " (INV)" : "");
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return 0;
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}
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/* Look for ifname matches. */
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ret = ifname_compare(indev, arpinfo->iniface, arpinfo->iniface_mask);
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if (FWINV(ret != 0, ARPT_INV_VIA_IN)) {
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dprintf("VIA in mismatch (%s vs %s).%s\n",
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indev, arpinfo->iniface,
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arpinfo->invflags&ARPT_INV_VIA_IN ?" (INV)":"");
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return 0;
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}
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ret = ifname_compare(outdev, arpinfo->outiface, arpinfo->outiface_mask);
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if (FWINV(ret != 0, ARPT_INV_VIA_OUT)) {
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dprintf("VIA out mismatch (%s vs %s).%s\n",
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outdev, arpinfo->outiface,
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arpinfo->invflags&ARPT_INV_VIA_OUT ?" (INV)":"");
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return 0;
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}
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return 1;
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#undef FWINV
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}
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static inline int arp_checkentry(const struct arpt_arp *arp)
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{
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if (arp->flags & ~ARPT_F_MASK) {
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duprintf("Unknown flag bits set: %08X\n",
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arp->flags & ~ARPT_F_MASK);
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return 0;
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}
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if (arp->invflags & ~ARPT_INV_MASK) {
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duprintf("Unknown invflag bits set: %08X\n",
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arp->invflags & ~ARPT_INV_MASK);
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return 0;
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}
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return 1;
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}
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static unsigned int
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arpt_error(struct sk_buff *skb, const struct xt_target_param *par)
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{
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if (net_ratelimit())
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printk("arp_tables: error: '%s'\n",
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(const char *)par->targinfo);
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return NF_DROP;
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}
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static inline struct arpt_entry *get_entry(void *base, unsigned int offset)
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{
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return (struct arpt_entry *)(base + offset);
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}
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static inline __pure
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struct arpt_entry *arpt_next_entry(const struct arpt_entry *entry)
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{
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return (void *)entry + entry->next_offset;
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}
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unsigned int arpt_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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unsigned int verdict = NF_DROP;
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const struct arphdr *arp;
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bool hotdrop = false;
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struct arpt_entry *e, *back;
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const char *indev, *outdev;
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void *table_base;
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const struct xt_table_info *private;
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struct xt_target_param tgpar;
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if (!pskb_may_pull(skb, arp_hdr_len(skb->dev)))
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return NF_DROP;
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indev = in ? in->name : nulldevname;
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outdev = out ? out->name : nulldevname;
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xt_info_rdlock_bh();
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private = table->private;
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table_base = private->entries[smp_processor_id()];
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e = get_entry(table_base, private->hook_entry[hook]);
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back = get_entry(table_base, private->underflow[hook]);
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tgpar.in = in;
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tgpar.out = out;
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tgpar.hooknum = hook;
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tgpar.family = NFPROTO_ARP;
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arp = arp_hdr(skb);
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do {
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struct arpt_entry_target *t;
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int hdr_len;
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if (!arp_packet_match(arp, skb->dev, indev, outdev, &e->arp)) {
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e = arpt_next_entry(e);
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continue;
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}
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hdr_len = sizeof(*arp) + (2 * sizeof(struct in_addr)) +
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(2 * skb->dev->addr_len);
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ADD_COUNTER(e->counters, hdr_len, 1);
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t = arpt_get_target(e);
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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 arpt_standard_target *)t)->verdict;
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if (v < 0) {
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/* Pop from stack? */
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if (v != ARPT_RETURN) {
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verdict = (unsigned)(-v) - 1;
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break;
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}
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e = back;
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back = get_entry(table_base, back->comefrom);
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continue;
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}
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if (table_base + v
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!= arpt_next_entry(e)) {
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/* Save old back ptr in next entry */
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struct arpt_entry *next = arpt_next_entry(e);
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next->comefrom = (void *)back - table_base;
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/* set back pointer to next entry */
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back = next;
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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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/* Targets which reenter must return
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* abs. verdicts
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*/
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tgpar.target = t->u.kernel.target;
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tgpar.targinfo = t->data;
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verdict = t->u.kernel.target->target(skb, &tgpar);
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/* Target might have changed stuff. */
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arp = arp_hdr(skb);
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if (verdict == ARPT_CONTINUE)
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e = arpt_next_entry(e);
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else
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/* Verdict */
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break;
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} while (!hotdrop);
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xt_info_rdunlock_bh();
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if (hotdrop)
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return NF_DROP;
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else
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return verdict;
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}
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/* All zeroes == unconditional rule. */
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static inline bool unconditional(const struct arpt_arp *arp)
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{
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static const struct arpt_arp uncond;
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return memcmp(arp, &uncond, sizeof(uncond)) == 0;
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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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*/
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static int mark_source_chains(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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/* 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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*/
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for (hook = 0; hook < NF_ARP_NUMHOOKS; hook++) {
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unsigned int pos = newinfo->hook_entry[hook];
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struct arpt_entry *e
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= (struct arpt_entry *)(entry0 + pos);
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if (!(valid_hooks & (1 << hook)))
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continue;
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/* Set initial back pointer. */
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e->counters.pcnt = pos;
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for (;;) {
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const struct arpt_standard_target *t
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= (void *)arpt_get_target(e);
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int visited = e->comefrom & (1 << hook);
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if (e->comefrom & (1 << NF_ARP_NUMHOOKS)) {
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printk("arptables: 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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}
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e->comefrom
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|= ((1 << hook) | (1 << NF_ARP_NUMHOOKS));
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/* Unconditional return/END. */
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if ((e->target_offset == sizeof(struct arpt_entry)
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&& (strcmp(t->target.u.user.name,
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ARPT_STANDARD_TARGET) == 0)
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&& t->verdict < 0
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&& unconditional(&e->arp)) || visited) {
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unsigned int oldpos, size;
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if ((strcmp(t->target.u.user.name,
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ARPT_STANDARD_TARGET) == 0) &&
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t->verdict < -NF_MAX_VERDICT - 1) {
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duprintf("mark_source_chains: bad "
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"negative verdict (%i)\n",
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t->verdict);
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return 0;
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}
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/* Return: backtrack through the last
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* big jump.
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*/
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do {
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e->comefrom ^= (1<<NF_ARP_NUMHOOKS);
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oldpos = pos;
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pos = e->counters.pcnt;
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e->counters.pcnt = 0;
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/* We're at the start. */
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if (pos == oldpos)
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goto next;
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e = (struct arpt_entry *)
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(entry0 + pos);
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} while (oldpos == pos + e->next_offset);
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/* Move along one */
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size = e->next_offset;
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e = (struct arpt_entry *)
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(entry0 + pos + size);
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e->counters.pcnt = pos;
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pos += size;
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} else {
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int newpos = t->verdict;
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if (strcmp(t->target.u.user.name,
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ARPT_STANDARD_TARGET) == 0
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&& newpos >= 0) {
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if (newpos > newinfo->size -
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sizeof(struct arpt_entry)) {
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duprintf("mark_source_chains: "
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"bad verdict (%i)\n",
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newpos);
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return 0;
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}
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/* This a jump; chase it. */
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duprintf("Jump rule %u -> %u\n",
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pos, newpos);
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} else {
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/* ... this is a fallthru */
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newpos = pos + e->next_offset;
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}
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e = (struct arpt_entry *)
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(entry0 + newpos);
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e->counters.pcnt = pos;
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pos = newpos;
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}
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}
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next:
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duprintf("Finished chain %u\n", hook);
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}
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return 1;
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}
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static inline int check_entry(struct arpt_entry *e, const char *name)
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{
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const struct arpt_entry_target *t;
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if (!arp_checkentry(&e->arp)) {
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duprintf("arp_tables: arp check failed %p %s.\n", e, name);
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return -EINVAL;
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}
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if (e->target_offset + sizeof(struct arpt_entry_target) > e->next_offset)
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return -EINVAL;
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t = arpt_get_target(e);
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if (e->target_offset + t->u.target_size > e->next_offset)
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return -EINVAL;
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return 0;
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}
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static inline int check_target(struct arpt_entry *e, const char *name)
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{
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struct arpt_entry_target *t = arpt_get_target(e);
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int ret;
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struct xt_tgchk_param par = {
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.table = name,
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.entryinfo = e,
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.target = t->u.kernel.target,
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.targinfo = t->data,
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.hook_mask = e->comefrom,
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.family = NFPROTO_ARP,
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};
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ret = xt_check_target(&par, t->u.target_size - sizeof(*t), 0, false);
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if (ret < 0) {
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duprintf("arp_tables: check failed for `%s'.\n",
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t->u.kernel.target->name);
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return ret;
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}
|
|
return 0;
|
|
}
|
|
|
|
static inline int
|
|
find_check_entry(struct arpt_entry *e, const char *name, unsigned int size,
|
|
unsigned int *i)
|
|
{
|
|
struct arpt_entry_target *t;
|
|
struct xt_target *target;
|
|
int ret;
|
|
|
|
ret = check_entry(e, name);
|
|
if (ret)
|
|
return ret;
|
|
|
|
t = arpt_get_target(e);
|
|
target = try_then_request_module(xt_find_target(NFPROTO_ARP,
|
|
t->u.user.name,
|
|
t->u.user.revision),
|
|
"arpt_%s", t->u.user.name);
|
|
if (IS_ERR(target) || !target) {
|
|
duprintf("find_check_entry: `%s' not found\n", t->u.user.name);
|
|
ret = target ? PTR_ERR(target) : -ENOENT;
|
|
goto out;
|
|
}
|
|
t->u.kernel.target = target;
|
|
|
|
ret = check_target(e, name);
|
|
if (ret)
|
|
goto err;
|
|
|
|
(*i)++;
|
|
return 0;
|
|
err:
|
|
module_put(t->u.kernel.target->me);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static inline int check_entry_size_and_hooks(struct arpt_entry *e,
|
|
struct xt_table_info *newinfo,
|
|
unsigned char *base,
|
|
unsigned char *limit,
|
|
const unsigned int *hook_entries,
|
|
const unsigned int *underflows,
|
|
unsigned int valid_hooks,
|
|
unsigned int *i)
|
|
{
|
|
unsigned int h;
|
|
|
|
if ((unsigned long)e % __alignof__(struct arpt_entry) != 0
|
|
|| (unsigned char *)e + sizeof(struct arpt_entry) >= limit) {
|
|
duprintf("Bad offset %p\n", e);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (e->next_offset
|
|
< sizeof(struct arpt_entry) + sizeof(struct arpt_entry_target)) {
|
|
duprintf("checking: element %p size %u\n",
|
|
e, e->next_offset);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Check hooks & underflows */
|
|
for (h = 0; h < NF_ARP_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 (!unconditional(&e->arp)) {
|
|
pr_err("Underflows must be unconditional\n");
|
|
return -EINVAL;
|
|
}
|
|
newinfo->underflow[h] = underflows[h];
|
|
}
|
|
}
|
|
|
|
/* Clear counters and comefrom */
|
|
e->counters = ((struct xt_counters) { 0, 0 });
|
|
e->comefrom = 0;
|
|
|
|
(*i)++;
|
|
return 0;
|
|
}
|
|
|
|
static inline int cleanup_entry(struct arpt_entry *e, unsigned int *i)
|
|
{
|
|
struct xt_tgdtor_param par;
|
|
struct arpt_entry_target *t;
|
|
|
|
if (i && (*i)-- == 0)
|
|
return 1;
|
|
|
|
t = arpt_get_target(e);
|
|
par.target = t->u.kernel.target;
|
|
par.targinfo = t->data;
|
|
par.family = NFPROTO_ARP;
|
|
if (par.target->destroy != NULL)
|
|
par.target->destroy(&par);
|
|
module_put(par.target->me);
|
|
return 0;
|
|
}
|
|
|
|
/* Checks and translates the user-supplied table segment (held in
|
|
* newinfo).
|
|
*/
|
|
static int translate_table(const char *name,
|
|
unsigned int valid_hooks,
|
|
struct xt_table_info *newinfo,
|
|
void *entry0,
|
|
unsigned int size,
|
|
unsigned int number,
|
|
const unsigned int *hook_entries,
|
|
const unsigned int *underflows)
|
|
{
|
|
unsigned int i;
|
|
int ret;
|
|
|
|
newinfo->size = size;
|
|
newinfo->number = number;
|
|
|
|
/* Init all hooks to impossible value. */
|
|
for (i = 0; i < NF_ARP_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. */
|
|
ret = ARPT_ENTRY_ITERATE(entry0, newinfo->size,
|
|
check_entry_size_and_hooks,
|
|
newinfo,
|
|
entry0,
|
|
entry0 + size,
|
|
hook_entries, underflows, valid_hooks, &i);
|
|
duprintf("translate_table: ARPT_ENTRY_ITERATE gives %d\n", ret);
|
|
if (ret != 0)
|
|
return ret;
|
|
|
|
if (i != number) {
|
|
duprintf("translate_table: %u not %u entries\n",
|
|
i, number);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Check hooks all assigned */
|
|
for (i = 0; i < NF_ARP_NUMHOOKS; i++) {
|
|
/* Only hooks which are valid */
|
|
if (!(valid_hooks & (1 << i)))
|
|
continue;
|
|
if (newinfo->hook_entry[i] == 0xFFFFFFFF) {
|
|
duprintf("Invalid hook entry %u %u\n",
|
|
i, hook_entries[i]);
|
|
return -EINVAL;
|
|
}
|
|
if (newinfo->underflow[i] == 0xFFFFFFFF) {
|
|
duprintf("Invalid underflow %u %u\n",
|
|
i, underflows[i]);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
if (!mark_source_chains(newinfo, valid_hooks, entry0)) {
|
|
duprintf("Looping hook\n");
|
|
return -ELOOP;
|
|
}
|
|
|
|
/* Finally, each sanity check must pass */
|
|
i = 0;
|
|
ret = ARPT_ENTRY_ITERATE(entry0, newinfo->size,
|
|
find_check_entry, name, size, &i);
|
|
|
|
if (ret != 0) {
|
|
ARPT_ENTRY_ITERATE(entry0, newinfo->size,
|
|
cleanup_entry, &i);
|
|
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;
|
|
}
|
|
|
|
/* Gets counters. */
|
|
static inline int add_entry_to_counter(const struct arpt_entry *e,
|
|
struct xt_counters total[],
|
|
unsigned int *i)
|
|
{
|
|
ADD_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt);
|
|
|
|
(*i)++;
|
|
return 0;
|
|
}
|
|
|
|
static inline int set_entry_to_counter(const struct arpt_entry *e,
|
|
struct xt_counters total[],
|
|
unsigned int *i)
|
|
{
|
|
SET_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt);
|
|
|
|
(*i)++;
|
|
return 0;
|
|
}
|
|
|
|
static void get_counters(const struct xt_table_info *t,
|
|
struct xt_counters counters[])
|
|
{
|
|
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;
|
|
ARPT_ENTRY_ITERATE(t->entries[curcpu],
|
|
t->size,
|
|
set_entry_to_counter,
|
|
counters,
|
|
&i);
|
|
|
|
for_each_possible_cpu(cpu) {
|
|
if (cpu == curcpu)
|
|
continue;
|
|
i = 0;
|
|
xt_info_wrlock(cpu);
|
|
ARPT_ENTRY_ITERATE(t->entries[cpu],
|
|
t->size,
|
|
add_entry_to_counter,
|
|
counters,
|
|
&i);
|
|
xt_info_wrunlock(cpu);
|
|
}
|
|
local_bh_enable();
|
|
}
|
|
|
|
static struct xt_counters *alloc_counters(struct xt_table *table)
|
|
{
|
|
unsigned int countersize;
|
|
struct xt_counters *counters;
|
|
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,
|
|
struct xt_table *table,
|
|
void __user *userptr)
|
|
{
|
|
unsigned int off, num;
|
|
struct arpt_entry *e;
|
|
struct xt_counters *counters;
|
|
struct xt_table_info *private = table->private;
|
|
int ret = 0;
|
|
void *loc_cpu_entry;
|
|
|
|
counters = alloc_counters(table);
|
|
if (IS_ERR(counters))
|
|
return PTR_ERR(counters);
|
|
|
|
loc_cpu_entry = private->entries[raw_smp_processor_id()];
|
|
/* ... then copy entire thing ... */
|
|
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++){
|
|
struct arpt_entry_target *t;
|
|
|
|
e = (struct arpt_entry *)(loc_cpu_entry + off);
|
|
if (copy_to_user(userptr + off
|
|
+ offsetof(struct arpt_entry, counters),
|
|
&counters[num],
|
|
sizeof(counters[num])) != 0) {
|
|
ret = -EFAULT;
|
|
goto free_counters;
|
|
}
|
|
|
|
t = arpt_get_target(e);
|
|
if (copy_to_user(userptr + off + e->target_offset
|
|
+ offsetof(struct arpt_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, void *src)
|
|
{
|
|
int v = *(compat_int_t *)src;
|
|
|
|
if (v > 0)
|
|
v += xt_compat_calc_jump(NFPROTO_ARP, v);
|
|
memcpy(dst, &v, sizeof(v));
|
|
}
|
|
|
|
static int compat_standard_to_user(void __user *dst, void *src)
|
|
{
|
|
compat_int_t cv = *(int *)src;
|
|
|
|
if (cv > 0)
|
|
cv -= xt_compat_calc_jump(NFPROTO_ARP, cv);
|
|
return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0;
|
|
}
|
|
|
|
static int compat_calc_entry(struct arpt_entry *e,
|
|
const struct xt_table_info *info,
|
|
void *base, struct xt_table_info *newinfo)
|
|
{
|
|
struct arpt_entry_target *t;
|
|
unsigned int entry_offset;
|
|
int off, i, ret;
|
|
|
|
off = sizeof(struct arpt_entry) - sizeof(struct compat_arpt_entry);
|
|
entry_offset = (void *)e - base;
|
|
|
|
t = arpt_get_target(e);
|
|
off += xt_compat_target_offset(t->u.kernel.target);
|
|
newinfo->size -= off;
|
|
ret = xt_compat_add_offset(NFPROTO_ARP, entry_offset, off);
|
|
if (ret)
|
|
return ret;
|
|
|
|
for (i = 0; i < NF_ARP_NUMHOOKS; i++) {
|
|
if (info->hook_entry[i] &&
|
|
(e < (struct arpt_entry *)(base + info->hook_entry[i])))
|
|
newinfo->hook_entry[i] -= off;
|
|
if (info->underflow[i] &&
|
|
(e < (struct arpt_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)
|
|
{
|
|
void *loc_cpu_entry;
|
|
|
|
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()];
|
|
return ARPT_ENTRY_ITERATE(loc_cpu_entry, info->size,
|
|
compat_calc_entry, info, loc_cpu_entry,
|
|
newinfo);
|
|
}
|
|
#endif
|
|
|
|
static int get_info(struct net *net, void __user *user, int *len, int compat)
|
|
{
|
|
char name[ARPT_TABLE_MAXNAMELEN];
|
|
struct xt_table *t;
|
|
int ret;
|
|
|
|
if (*len != sizeof(struct arpt_getinfo)) {
|
|
duprintf("length %u != %Zu\n", *len,
|
|
sizeof(struct arpt_getinfo));
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (copy_from_user(name, user, sizeof(name)) != 0)
|
|
return -EFAULT;
|
|
|
|
name[ARPT_TABLE_MAXNAMELEN-1] = '\0';
|
|
#ifdef CONFIG_COMPAT
|
|
if (compat)
|
|
xt_compat_lock(NFPROTO_ARP);
|
|
#endif
|
|
t = try_then_request_module(xt_find_table_lock(net, NFPROTO_ARP, name),
|
|
"arptable_%s", name);
|
|
if (t && !IS_ERR(t)) {
|
|
struct arpt_getinfo info;
|
|
const struct xt_table_info *private = t->private;
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
if (compat) {
|
|
struct xt_table_info tmp;
|
|
ret = compat_table_info(private, &tmp);
|
|
xt_compat_flush_offsets(NFPROTO_ARP);
|
|
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(NFPROTO_ARP);
|
|
#endif
|
|
return ret;
|
|
}
|
|
|
|
static int get_entries(struct net *net, struct arpt_get_entries __user *uptr,
|
|
int *len)
|
|
{
|
|
int ret;
|
|
struct arpt_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 arpt_get_entries) + get.size) {
|
|
duprintf("get_entries: %u != %Zu\n", *len,
|
|
sizeof(struct arpt_get_entries) + get.size);
|
|
return -EINVAL;
|
|
}
|
|
|
|
t = xt_find_table_lock(net, NFPROTO_ARP, get.name);
|
|
if (t && !IS_ERR(t)) {
|
|
const 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;
|
|
void *loc_cpu_old_entry;
|
|
|
|
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, NFPROTO_ARP, name),
|
|
"arptable_%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()];
|
|
ARPT_ENTRY_ITERATE(loc_cpu_old_entry, oldinfo->size, cleanup_entry,
|
|
NULL);
|
|
|
|
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, void __user *user, unsigned int len)
|
|
{
|
|
int ret;
|
|
struct arpt_replace tmp;
|
|
struct xt_table_info *newinfo;
|
|
void *loc_cpu_entry;
|
|
|
|
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(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("arp_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:
|
|
ARPT_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry, NULL);
|
|
free_newinfo:
|
|
xt_free_table_info(newinfo);
|
|
return ret;
|
|
}
|
|
|
|
/* We're lazy, and add to the first CPU; overflow works its fey magic
|
|
* and everything is OK. */
|
|
static int
|
|
add_counter_to_entry(struct arpt_entry *e,
|
|
const struct xt_counters addme[],
|
|
unsigned int *i)
|
|
{
|
|
ADD_COUNTER(e->counters, addme[*i].bcnt, addme[*i].pcnt);
|
|
|
|
(*i)++;
|
|
return 0;
|
|
}
|
|
|
|
static int do_add_counters(struct net *net, 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;
|
|
const char *name;
|
|
int size;
|
|
void *ptmp;
|
|
struct xt_table *t;
|
|
const struct xt_table_info *private;
|
|
int ret = 0;
|
|
void *loc_cpu_entry;
|
|
#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, NFPROTO_ARP, 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();
|
|
loc_cpu_entry = private->entries[curcpu];
|
|
xt_info_wrlock(curcpu);
|
|
ARPT_ENTRY_ITERATE(loc_cpu_entry,
|
|
private->size,
|
|
add_counter_to_entry,
|
|
paddc,
|
|
&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
|
|
static inline int
|
|
compat_release_entry(struct compat_arpt_entry *e, unsigned int *i)
|
|
{
|
|
struct arpt_entry_target *t;
|
|
|
|
if (i && (*i)-- == 0)
|
|
return 1;
|
|
|
|
t = compat_arpt_get_target(e);
|
|
module_put(t->u.kernel.target->me);
|
|
return 0;
|
|
}
|
|
|
|
static inline int
|
|
check_compat_entry_size_and_hooks(struct compat_arpt_entry *e,
|
|
struct xt_table_info *newinfo,
|
|
unsigned int *size,
|
|
unsigned char *base,
|
|
unsigned char *limit,
|
|
unsigned int *hook_entries,
|
|
unsigned int *underflows,
|
|
unsigned int *i,
|
|
const char *name)
|
|
{
|
|
struct arpt_entry_target *t;
|
|
struct xt_target *target;
|
|
unsigned int entry_offset;
|
|
int ret, off, h;
|
|
|
|
duprintf("check_compat_entry_size_and_hooks %p\n", e);
|
|
if ((unsigned long)e % __alignof__(struct compat_arpt_entry) != 0
|
|
|| (unsigned char *)e + sizeof(struct compat_arpt_entry) >= limit) {
|
|
duprintf("Bad offset %p, limit = %p\n", e, limit);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (e->next_offset < sizeof(struct compat_arpt_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 arpt_entry *)e, name);
|
|
if (ret)
|
|
return ret;
|
|
|
|
off = sizeof(struct arpt_entry) - sizeof(struct compat_arpt_entry);
|
|
entry_offset = (void *)e - (void *)base;
|
|
|
|
t = compat_arpt_get_target(e);
|
|
target = try_then_request_module(xt_find_target(NFPROTO_ARP,
|
|
t->u.user.name,
|
|
t->u.user.revision),
|
|
"arpt_%s", t->u.user.name);
|
|
if (IS_ERR(target) || !target) {
|
|
duprintf("check_compat_entry_size_and_hooks: `%s' not found\n",
|
|
t->u.user.name);
|
|
ret = target ? PTR_ERR(target) : -ENOENT;
|
|
goto out;
|
|
}
|
|
t->u.kernel.target = target;
|
|
|
|
off += xt_compat_target_offset(target);
|
|
*size += off;
|
|
ret = xt_compat_add_offset(NFPROTO_ARP, entry_offset, off);
|
|
if (ret)
|
|
goto release_target;
|
|
|
|
/* Check hooks & underflows */
|
|
for (h = 0; h < NF_ARP_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;
|
|
|
|
(*i)++;
|
|
return 0;
|
|
|
|
release_target:
|
|
module_put(t->u.kernel.target->me);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
compat_copy_entry_from_user(struct compat_arpt_entry *e, void **dstptr,
|
|
unsigned int *size, const char *name,
|
|
struct xt_table_info *newinfo, unsigned char *base)
|
|
{
|
|
struct arpt_entry_target *t;
|
|
struct xt_target *target;
|
|
struct arpt_entry *de;
|
|
unsigned int origsize;
|
|
int ret, h;
|
|
|
|
ret = 0;
|
|
origsize = *size;
|
|
de = (struct arpt_entry *)*dstptr;
|
|
memcpy(de, e, sizeof(struct arpt_entry));
|
|
memcpy(&de->counters, &e->counters, sizeof(e->counters));
|
|
|
|
*dstptr += sizeof(struct arpt_entry);
|
|
*size += sizeof(struct arpt_entry) - sizeof(struct compat_arpt_entry);
|
|
|
|
de->target_offset = e->target_offset - (origsize - *size);
|
|
t = compat_arpt_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_ARP_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 inline int compat_check_entry(struct arpt_entry *e, const char *name,
|
|
unsigned int *i)
|
|
{
|
|
int ret;
|
|
|
|
ret = check_target(e, name);
|
|
if (ret)
|
|
return ret;
|
|
|
|
(*i)++;
|
|
return 0;
|
|
}
|
|
|
|
static int translate_compat_table(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;
|
|
unsigned int size;
|
|
int ret;
|
|
|
|
info = *pinfo;
|
|
entry0 = *pentry0;
|
|
size = total_size;
|
|
info->number = number;
|
|
|
|
/* Init all hooks to impossible value. */
|
|
for (i = 0; i < NF_ARP_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(NFPROTO_ARP);
|
|
/* Walk through entries, checking offsets. */
|
|
ret = COMPAT_ARPT_ENTRY_ITERATE(entry0, total_size,
|
|
check_compat_entry_size_and_hooks,
|
|
info, &size, entry0,
|
|
entry0 + total_size,
|
|
hook_entries, underflows, &j, name);
|
|
if (ret != 0)
|
|
goto out_unlock;
|
|
|
|
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_ARP_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_ARP_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;
|
|
ret = COMPAT_ARPT_ENTRY_ITERATE(entry0, total_size,
|
|
compat_copy_entry_from_user,
|
|
&pos, &size, name, newinfo, entry1);
|
|
xt_compat_flush_offsets(NFPROTO_ARP);
|
|
xt_compat_unlock(NFPROTO_ARP);
|
|
if (ret)
|
|
goto free_newinfo;
|
|
|
|
ret = -ELOOP;
|
|
if (!mark_source_chains(newinfo, valid_hooks, entry1))
|
|
goto free_newinfo;
|
|
|
|
i = 0;
|
|
ret = ARPT_ENTRY_ITERATE(entry1, newinfo->size, compat_check_entry,
|
|
name, &i);
|
|
if (ret) {
|
|
j -= i;
|
|
COMPAT_ARPT_ENTRY_ITERATE_CONTINUE(entry0, newinfo->size, i,
|
|
compat_release_entry, &j);
|
|
ARPT_ENTRY_ITERATE(entry1, newinfo->size, cleanup_entry, &i);
|
|
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:
|
|
COMPAT_ARPT_ENTRY_ITERATE(entry0, total_size, compat_release_entry, &j);
|
|
return ret;
|
|
out_unlock:
|
|
xt_compat_flush_offsets(NFPROTO_ARP);
|
|
xt_compat_unlock(NFPROTO_ARP);
|
|
goto out;
|
|
}
|
|
|
|
struct compat_arpt_replace {
|
|
char name[ARPT_TABLE_MAXNAMELEN];
|
|
u32 valid_hooks;
|
|
u32 num_entries;
|
|
u32 size;
|
|
u32 hook_entry[NF_ARP_NUMHOOKS];
|
|
u32 underflow[NF_ARP_NUMHOOKS];
|
|
u32 num_counters;
|
|
compat_uptr_t counters;
|
|
struct compat_arpt_entry entries[0];
|
|
};
|
|
|
|
static int compat_do_replace(struct net *net, void __user *user,
|
|
unsigned int len)
|
|
{
|
|
int ret;
|
|
struct compat_arpt_replace tmp;
|
|
struct xt_table_info *newinfo;
|
|
void *loc_cpu_entry;
|
|
|
|
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(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:
|
|
ARPT_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry, NULL);
|
|
free_newinfo:
|
|
xt_free_table_info(newinfo);
|
|
return ret;
|
|
}
|
|
|
|
static int compat_do_arpt_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 ARPT_SO_SET_REPLACE:
|
|
ret = compat_do_replace(sock_net(sk), user, len);
|
|
break;
|
|
|
|
case ARPT_SO_SET_ADD_COUNTERS:
|
|
ret = do_add_counters(sock_net(sk), user, len, 1);
|
|
break;
|
|
|
|
default:
|
|
duprintf("do_arpt_set_ctl: unknown request %i\n", cmd);
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int compat_copy_entry_to_user(struct arpt_entry *e, void __user **dstptr,
|
|
compat_uint_t *size,
|
|
struct xt_counters *counters,
|
|
unsigned int *i)
|
|
{
|
|
struct arpt_entry_target *t;
|
|
struct compat_arpt_entry __user *ce;
|
|
u_int16_t target_offset, next_offset;
|
|
compat_uint_t origsize;
|
|
int ret;
|
|
|
|
ret = -EFAULT;
|
|
origsize = *size;
|
|
ce = (struct compat_arpt_entry __user *)*dstptr;
|
|
if (copy_to_user(ce, e, sizeof(struct arpt_entry)))
|
|
goto out;
|
|
|
|
if (copy_to_user(&ce->counters, &counters[*i], sizeof(counters[*i])))
|
|
goto out;
|
|
|
|
*dstptr += sizeof(struct compat_arpt_entry);
|
|
*size -= sizeof(struct arpt_entry) - sizeof(struct compat_arpt_entry);
|
|
|
|
target_offset = e->target_offset - (origsize - *size);
|
|
|
|
t = arpt_get_target(e);
|
|
ret = xt_compat_target_to_user(t, dstptr, size);
|
|
if (ret)
|
|
goto out;
|
|
ret = -EFAULT;
|
|
next_offset = e->next_offset - (origsize - *size);
|
|
if (put_user(target_offset, &ce->target_offset))
|
|
goto out;
|
|
if (put_user(next_offset, &ce->next_offset))
|
|
goto out;
|
|
|
|
(*i)++;
|
|
return 0;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
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;
|
|
void *loc_cpu_entry;
|
|
unsigned int i = 0;
|
|
|
|
counters = alloc_counters(table);
|
|
if (IS_ERR(counters))
|
|
return PTR_ERR(counters);
|
|
|
|
/* choose the copy on our node/cpu */
|
|
loc_cpu_entry = private->entries[raw_smp_processor_id()];
|
|
pos = userptr;
|
|
size = total_size;
|
|
ret = ARPT_ENTRY_ITERATE(loc_cpu_entry, total_size,
|
|
compat_copy_entry_to_user,
|
|
&pos, &size, counters, &i);
|
|
vfree(counters);
|
|
return ret;
|
|
}
|
|
|
|
struct compat_arpt_get_entries {
|
|
char name[ARPT_TABLE_MAXNAMELEN];
|
|
compat_uint_t size;
|
|
struct compat_arpt_entry entrytable[0];
|
|
};
|
|
|
|
static int compat_get_entries(struct net *net,
|
|
struct compat_arpt_get_entries __user *uptr,
|
|
int *len)
|
|
{
|
|
int ret;
|
|
struct compat_arpt_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_arpt_get_entries) + get.size) {
|
|
duprintf("compat_get_entries: %u != %zu\n",
|
|
*len, sizeof(get) + get.size);
|
|
return -EINVAL;
|
|
}
|
|
|
|
xt_compat_lock(NFPROTO_ARP);
|
|
t = xt_find_table_lock(net, NFPROTO_ARP, 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(NFPROTO_ARP);
|
|
module_put(t->me);
|
|
xt_table_unlock(t);
|
|
} else
|
|
ret = t ? PTR_ERR(t) : -ENOENT;
|
|
|
|
xt_compat_unlock(NFPROTO_ARP);
|
|
return ret;
|
|
}
|
|
|
|
static int do_arpt_get_ctl(struct sock *, int, void __user *, int *);
|
|
|
|
static int compat_do_arpt_get_ctl(struct sock *sk, int cmd, void __user *user,
|
|
int *len)
|
|
{
|
|
int ret;
|
|
|
|
if (!capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
switch (cmd) {
|
|
case ARPT_SO_GET_INFO:
|
|
ret = get_info(sock_net(sk), user, len, 1);
|
|
break;
|
|
case ARPT_SO_GET_ENTRIES:
|
|
ret = compat_get_entries(sock_net(sk), user, len);
|
|
break;
|
|
default:
|
|
ret = do_arpt_get_ctl(sk, cmd, user, len);
|
|
}
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
static int do_arpt_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 ARPT_SO_SET_REPLACE:
|
|
ret = do_replace(sock_net(sk), user, len);
|
|
break;
|
|
|
|
case ARPT_SO_SET_ADD_COUNTERS:
|
|
ret = do_add_counters(sock_net(sk), user, len, 0);
|
|
break;
|
|
|
|
default:
|
|
duprintf("do_arpt_set_ctl: unknown request %i\n", cmd);
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int do_arpt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
|
|
{
|
|
int ret;
|
|
|
|
if (!capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
switch (cmd) {
|
|
case ARPT_SO_GET_INFO:
|
|
ret = get_info(sock_net(sk), user, len, 0);
|
|
break;
|
|
|
|
case ARPT_SO_GET_ENTRIES:
|
|
ret = get_entries(sock_net(sk), user, len);
|
|
break;
|
|
|
|
case ARPT_SO_GET_REVISION_TARGET: {
|
|
struct xt_get_revision rev;
|
|
|
|
if (*len != sizeof(rev)) {
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
if (copy_from_user(&rev, user, sizeof(rev)) != 0) {
|
|
ret = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
try_then_request_module(xt_find_revision(NFPROTO_ARP, rev.name,
|
|
rev.revision, 1, &ret),
|
|
"arpt_%s", rev.name);
|
|
break;
|
|
}
|
|
|
|
default:
|
|
duprintf("do_arpt_get_ctl: unknown request %i\n", cmd);
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
struct xt_table *arpt_register_table(struct net *net, struct xt_table *table,
|
|
const struct arpt_replace *repl)
|
|
{
|
|
int ret;
|
|
struct xt_table_info *newinfo;
|
|
struct xt_table_info bootstrap
|
|
= { 0, 0, 0, { 0 }, { 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 */
|
|
loc_cpu_entry = newinfo->entries[raw_smp_processor_id()];
|
|
memcpy(loc_cpu_entry, repl->entries, repl->size);
|
|
|
|
ret = translate_table(table->name, table->valid_hooks,
|
|
newinfo, loc_cpu_entry, repl->size,
|
|
repl->num_entries,
|
|
repl->hook_entry,
|
|
repl->underflow);
|
|
|
|
duprintf("arpt_register_table: translate table gives %d\n", ret);
|
|
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 arpt_unregister_table(struct xt_table *table)
|
|
{
|
|
struct xt_table_info *private;
|
|
void *loc_cpu_entry;
|
|
struct module *table_owner = table->me;
|
|
|
|
private = xt_unregister_table(table);
|
|
|
|
/* Decrease module usage counts and free resources */
|
|
loc_cpu_entry = private->entries[raw_smp_processor_id()];
|
|
ARPT_ENTRY_ITERATE(loc_cpu_entry, private->size,
|
|
cleanup_entry, NULL);
|
|
if (private->number > private->initial_entries)
|
|
module_put(table_owner);
|
|
xt_free_table_info(private);
|
|
}
|
|
|
|
/* The built-in targets: standard (NULL) and error. */
|
|
static struct xt_target arpt_standard_target __read_mostly = {
|
|
.name = ARPT_STANDARD_TARGET,
|
|
.targetsize = sizeof(int),
|
|
.family = NFPROTO_ARP,
|
|
#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 arpt_error_target __read_mostly = {
|
|
.name = ARPT_ERROR_TARGET,
|
|
.target = arpt_error,
|
|
.targetsize = ARPT_FUNCTION_MAXNAMELEN,
|
|
.family = NFPROTO_ARP,
|
|
};
|
|
|
|
static struct nf_sockopt_ops arpt_sockopts = {
|
|
.pf = PF_INET,
|
|
.set_optmin = ARPT_BASE_CTL,
|
|
.set_optmax = ARPT_SO_SET_MAX+1,
|
|
.set = do_arpt_set_ctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_set = compat_do_arpt_set_ctl,
|
|
#endif
|
|
.get_optmin = ARPT_BASE_CTL,
|
|
.get_optmax = ARPT_SO_GET_MAX+1,
|
|
.get = do_arpt_get_ctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_get = compat_do_arpt_get_ctl,
|
|
#endif
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static int __net_init arp_tables_net_init(struct net *net)
|
|
{
|
|
return xt_proto_init(net, NFPROTO_ARP);
|
|
}
|
|
|
|
static void __net_exit arp_tables_net_exit(struct net *net)
|
|
{
|
|
xt_proto_fini(net, NFPROTO_ARP);
|
|
}
|
|
|
|
static struct pernet_operations arp_tables_net_ops = {
|
|
.init = arp_tables_net_init,
|
|
.exit = arp_tables_net_exit,
|
|
};
|
|
|
|
static int __init arp_tables_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = register_pernet_subsys(&arp_tables_net_ops);
|
|
if (ret < 0)
|
|
goto err1;
|
|
|
|
/* Noone else will be downing sem now, so we won't sleep */
|
|
ret = xt_register_target(&arpt_standard_target);
|
|
if (ret < 0)
|
|
goto err2;
|
|
ret = xt_register_target(&arpt_error_target);
|
|
if (ret < 0)
|
|
goto err3;
|
|
|
|
/* Register setsockopt */
|
|
ret = nf_register_sockopt(&arpt_sockopts);
|
|
if (ret < 0)
|
|
goto err4;
|
|
|
|
printk(KERN_INFO "arp_tables: (C) 2002 David S. Miller\n");
|
|
return 0;
|
|
|
|
err4:
|
|
xt_unregister_target(&arpt_error_target);
|
|
err3:
|
|
xt_unregister_target(&arpt_standard_target);
|
|
err2:
|
|
unregister_pernet_subsys(&arp_tables_net_ops);
|
|
err1:
|
|
return ret;
|
|
}
|
|
|
|
static void __exit arp_tables_fini(void)
|
|
{
|
|
nf_unregister_sockopt(&arpt_sockopts);
|
|
xt_unregister_target(&arpt_error_target);
|
|
xt_unregister_target(&arpt_standard_target);
|
|
unregister_pernet_subsys(&arp_tables_net_ops);
|
|
}
|
|
|
|
EXPORT_SYMBOL(arpt_register_table);
|
|
EXPORT_SYMBOL(arpt_unregister_table);
|
|
EXPORT_SYMBOL(arpt_do_table);
|
|
|
|
module_init(arp_tables_init);
|
|
module_exit(arp_tables_fini);
|