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netfilter: change return types of match functions for ebtables extensions

Browse Source 
Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Jan Engelhardt 2008-10-08 11:35:13 +02:00 committed by Patrick McHardy
parent 19eda879a1
commit 8cc784eec6
11 changed files with 104 additions and 105 deletions
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3
include/linux/netfilter_bridge/ebtables.h
View File

@ -207,8 +207,7 @@ struct ebt_match
{
struct list_head list;
const char name[EBT_FUNCTION_MAXNAMELEN];
/* 0 == it matches */
int (*match)(const struct sk_buff *skb, const struct net_device *in,
bool (*match)(const struct sk_buff *skb, const struct net_device *in,
const struct net_device *out, const void *matchdata,
unsigned int datalen);
bool (*check)(const char *tablename, unsigned int hookmask,

13
net/bridge/netfilter/ebt_802_3.c
View File

@ -12,7 +12,8 @@
#include <linux/netfilter_bridge/ebtables.h>
#include <linux/netfilter_bridge/ebt_802_3.h>
static int ebt_filter_802_3(const struct sk_buff *skb, const struct net_device *in,
static bool ebt_filter_802_3(const struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out, const void *data, unsigned int datalen)
{
const struct ebt_802_3_info *info = data;
@ -21,19 +22,19 @@ static int ebt_filter_802_3(const struct sk_buff *skb, const struct net_device *
if (info->bitmask & EBT_802_3_SAP) {
if (FWINV(info->sap != hdr->llc.ui.ssap, EBT_802_3_SAP))
return EBT_NOMATCH;
return false;
if (FWINV(info->sap != hdr->llc.ui.dsap, EBT_802_3_SAP))
return EBT_NOMATCH;
return false;
}
if (info->bitmask & EBT_802_3_TYPE) {
if (!(hdr->llc.ui.dsap == CHECK_TYPE && hdr->llc.ui.ssap == CHECK_TYPE))
return EBT_NOMATCH;
return false;
if (FWINV(info->type != type, EBT_802_3_TYPE))
return EBT_NOMATCH;
return false;
}
return EBT_MATCH;
return true;
}
static struct ebt_match filter_802_3;

44
net/bridge/netfilter/ebt_among.c
View File

@ -14,8 +14,8 @@
#include <linux/if_arp.h>
#include <linux/module.h>
static int ebt_mac_wormhash_contains(const struct ebt_mac_wormhash *wh,
const char *mac, __be32 ip)
static bool ebt_mac_wormhash_contains(const struct ebt_mac_wormhash *wh,
const char *mac, __be32 ip)
{
/* You may be puzzled as to how this code works.
* Some tricks were used, refer to
@ -33,23 +33,19 @@ static int ebt_mac_wormhash_contains(const struct ebt_mac_wormhash *wh,
if (ip) {
for (i = start; i < limit; i++) {
p = &wh->pool[i];
if (cmp[1] == p->cmp[1] && cmp[0] == p->cmp[0]) {
if (p->ip == 0 || p->ip == ip) {
return 1;
}
}
if (cmp[1] == p->cmp[1] && cmp[0] == p->cmp[0])
if (p->ip == 0 || p->ip == ip)
return true;
}
} else {
for (i = start; i < limit; i++) {
p = &wh->pool[i];
if (cmp[1] == p->cmp[1] && cmp[0] == p->cmp[0]) {
if (p->ip == 0) {
return 1;
}
}
if (cmp[1] == p->cmp[1] && cmp[0] == p->cmp[0])
if (p->ip == 0)
return true;
}
}
return 0;
return false;
}
static int ebt_mac_wormhash_check_integrity(const struct ebt_mac_wormhash
@ -131,10 +127,10 @@ static int get_ip_src(const struct sk_buff *skb, __be32 *addr)
return 0;
}
static int ebt_filter_among(const struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out, const void *data,
unsigned int datalen)
static bool ebt_filter_among(const struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out, const void *data,
unsigned int datalen)
{
const struct ebt_among_info *info = data;
const char *dmac, *smac;
@ -147,34 +143,34 @@ static int ebt_filter_among(const struct sk_buff *skb,
if (wh_src) {
smac = eth_hdr(skb)->h_source;
if (get_ip_src(skb, &sip))
return EBT_NOMATCH;
return false;
if (!(info->bitmask & EBT_AMONG_SRC_NEG)) {
/* we match only if it contains */
if (!ebt_mac_wormhash_contains(wh_src, smac, sip))
return EBT_NOMATCH;
return false;
} else {
/* we match only if it DOES NOT contain */
if (ebt_mac_wormhash_contains(wh_src, smac, sip))
return EBT_NOMATCH;
return false;
}
}
if (wh_dst) {
dmac = eth_hdr(skb)->h_dest;
if (get_ip_dst(skb, &dip))
return EBT_NOMATCH;
return false;
if (!(info->bitmask & EBT_AMONG_DST_NEG)) {
/* we match only if it contains */
if (!ebt_mac_wormhash_contains(wh_dst, dmac, dip))
return EBT_NOMATCH;
return false;
} else {
/* we match only if it DOES NOT contain */
if (ebt_mac_wormhash_contains(wh_dst, dmac, dip))
return EBT_NOMATCH;
return false;
}
}
return EBT_MATCH;
return true;
}
static bool

35
net/bridge/netfilter/ebt_arp.c
View File

@ -15,7 +15,8 @@
#include <linux/netfilter_bridge/ebtables.h>
#include <linux/netfilter_bridge/ebt_arp.h>
static int ebt_filter_arp(const struct sk_buff *skb, const struct net_device *in,
static bool ebt_filter_arp(const struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out, const void *data, unsigned int datalen)
{
const struct ebt_arp_info *info = data;
@ -24,42 +25,42 @@ static int ebt_filter_arp(const struct sk_buff *skb, const struct net_device *in
ah = skb_header_pointer(skb, 0, sizeof(_arph), &_arph);
if (ah == NULL)
return EBT_NOMATCH;
return false;
if (info->bitmask & EBT_ARP_OPCODE && FWINV(info->opcode !=
ah->ar_op, EBT_ARP_OPCODE))
return EBT_NOMATCH;
return false;
if (info->bitmask & EBT_ARP_HTYPE && FWINV(info->htype !=
ah->ar_hrd, EBT_ARP_HTYPE))
return EBT_NOMATCH;
return false;
if (info->bitmask & EBT_ARP_PTYPE && FWINV(info->ptype !=
ah->ar_pro, EBT_ARP_PTYPE))
return EBT_NOMATCH;
return false;
if (info->bitmask & (EBT_ARP_SRC_IP | EBT_ARP_DST_IP | EBT_ARP_GRAT)) {
const __be32 *sap, *dap;
__be32 saddr, daddr;
if (ah->ar_pln != sizeof(__be32) || ah->ar_pro != htons(ETH_P_IP))
return EBT_NOMATCH;
return false;
sap = skb_header_pointer(skb, sizeof(struct arphdr) +
ah->ar_hln, sizeof(saddr),
&saddr);
if (sap == NULL)
return EBT_NOMATCH;
return false;
dap = skb_header_pointer(skb, sizeof(struct arphdr) +
2*ah->ar_hln+sizeof(saddr),
sizeof(daddr), &daddr);
if (dap == NULL)
return EBT_NOMATCH;
return false;
if (info->bitmask & EBT_ARP_SRC_IP &&
FWINV(info->saddr != (*sap & info->smsk), EBT_ARP_SRC_IP))
return EBT_NOMATCH;
return false;
if (info->bitmask & EBT_ARP_DST_IP &&
FWINV(info->daddr != (*dap & info->dmsk), EBT_ARP_DST_IP))
return EBT_NOMATCH;
return false;
if (info->bitmask & EBT_ARP_GRAT &&
FWINV(*dap != *sap, EBT_ARP_GRAT))
return EBT_NOMATCH;
return false;
}
if (info->bitmask & (EBT_ARP_SRC_MAC | EBT_ARP_DST_MAC)) {
@ -68,18 +69,18 @@ static int ebt_filter_arp(const struct sk_buff *skb, const struct net_device *in
uint8_t verdict, i;
if (ah->ar_hln != ETH_ALEN || ah->ar_hrd != htons(ARPHRD_ETHER))
return EBT_NOMATCH;
return false;
if (info->bitmask & EBT_ARP_SRC_MAC) {
mp = skb_header_pointer(skb, sizeof(struct arphdr),
sizeof(_mac), &_mac);
if (mp == NULL)
return EBT_NOMATCH;
return false;
verdict = 0;
for (i = 0; i < 6; i++)
verdict |= (mp[i] ^ info->smaddr[i]) &
info->smmsk[i];
if (FWINV(verdict != 0, EBT_ARP_SRC_MAC))
return EBT_NOMATCH;
return false;
}
if (info->bitmask & EBT_ARP_DST_MAC) {
@ -87,17 +88,17 @@ static int ebt_filter_arp(const struct sk_buff *skb, const struct net_device *in
ah->ar_hln + ah->ar_pln,
sizeof(_mac), &_mac);
if (mp == NULL)
return EBT_NOMATCH;
return false;
verdict = 0;
for (i = 0; i < 6; i++)
verdict |= (mp[i] ^ info->dmaddr[i]) &
info->dmmsk[i];
if (FWINV(verdict != 0, EBT_ARP_DST_MAC))
return EBT_NOMATCH;
return false;
}
}
return EBT_MATCH;
return true;
}
static bool ebt_arp_check(const char *tablename, unsigned int hookmask,

25
net/bridge/netfilter/ebt_ip.c
View File

@ -24,7 +24,8 @@ struct tcpudphdr {
__be16 dst;
};
static int ebt_filter_ip(const struct sk_buff *skb, const struct net_device *in,
static bool ebt_filter_ip(const struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out, const void *data,
unsigned int datalen)
{
@ -36,46 +37,46 @@ static int ebt_filter_ip(const struct sk_buff *skb, const struct net_device *in,
ih = skb_header_pointer(skb, 0, sizeof(_iph), &_iph);
if (ih == NULL)
return EBT_NOMATCH;
return false;
if (info->bitmask & EBT_IP_TOS &&
FWINV(info->tos != ih->tos, EBT_IP_TOS))
return EBT_NOMATCH;
return false;
if (info->bitmask & EBT_IP_SOURCE &&
FWINV((ih->saddr & info->smsk) !=
info->saddr, EBT_IP_SOURCE))
return EBT_NOMATCH;
return false;
if ((info->bitmask & EBT_IP_DEST) &&
FWINV((ih->daddr & info->dmsk) !=
info->daddr, EBT_IP_DEST))
return EBT_NOMATCH;
return false;
if (info->bitmask & EBT_IP_PROTO) {
if (FWINV(info->protocol != ih->protocol, EBT_IP_PROTO))
return EBT_NOMATCH;
return false;
if (!(info->bitmask & EBT_IP_DPORT) &&
!(info->bitmask & EBT_IP_SPORT))
return EBT_MATCH;
return true;
if (ntohs(ih->frag_off) & IP_OFFSET)
return EBT_NOMATCH;
return false;
pptr = skb_header_pointer(skb, ih->ihl*4,
sizeof(_ports), &_ports);
if (pptr == NULL)
return EBT_NOMATCH;
return false;
if (info->bitmask & EBT_IP_DPORT) {
u32 dst = ntohs(pptr->dst);
if (FWINV(dst < info->dport[0] ||
dst > info->dport[1],
EBT_IP_DPORT))
return EBT_NOMATCH;
return false;
}
if (info->bitmask & EBT_IP_SPORT) {
u32 src = ntohs(pptr->src);
if (FWINV(src < info->sport[0] ||
src > info->sport[1],
EBT_IP_SPORT))
return EBT_NOMATCH;
return false;
}
}
return EBT_MATCH;
return true;
}
static bool ebt_ip_check(const char *tablename, unsigned int hookmask,

26
net/bridge/netfilter/ebt_ip6.c
View File

@ -27,7 +27,7 @@ struct tcpudphdr {
__be16 dst;
};
static int ebt_filter_ip6(const struct sk_buff *skb,
static bool ebt_filter_ip6(const struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out, const void *data,
unsigned int datalen)
@ -42,54 +42,54 @@ static int ebt_filter_ip6(const struct sk_buff *skb,
ih6 = skb_header_pointer(skb, 0, sizeof(_ip6h), &_ip6h);
if (ih6 == NULL)
return EBT_NOMATCH;
return false;
if (info->bitmask & EBT_IP6_TCLASS &&
FWINV(info->tclass != ipv6_get_dsfield(ih6), EBT_IP6_TCLASS))
return EBT_NOMATCH;
return false;
for (i = 0; i < 4; i++)
tmp_addr.in6_u.u6_addr32[i] = ih6->saddr.in6_u.u6_addr32[i] &
info->smsk.in6_u.u6_addr32[i];
if (info->bitmask & EBT_IP6_SOURCE &&
FWINV((ipv6_addr_cmp(&tmp_addr, &info->saddr) != 0),
EBT_IP6_SOURCE))
return EBT_NOMATCH;
return false;
for (i = 0; i < 4; i++)
tmp_addr.in6_u.u6_addr32[i] = ih6->daddr.in6_u.u6_addr32[i] &
info->dmsk.in6_u.u6_addr32[i];
if (info->bitmask & EBT_IP6_DEST &&
FWINV((ipv6_addr_cmp(&tmp_addr, &info->daddr) != 0), EBT_IP6_DEST))
return EBT_NOMATCH;
return false;
if (info->bitmask & EBT_IP6_PROTO) {
uint8_t nexthdr = ih6->nexthdr;
int offset_ph;
offset_ph = ipv6_skip_exthdr(skb, sizeof(_ip6h), &nexthdr);
if (offset_ph == -1)
return EBT_NOMATCH;
return false;
if (FWINV(info->protocol != nexthdr, EBT_IP6_PROTO))
return EBT_NOMATCH;
return false;
if (!(info->bitmask & EBT_IP6_DPORT) &&
!(info->bitmask & EBT_IP6_SPORT))
return EBT_MATCH;
return true;
pptr = skb_header_pointer(skb, offset_ph, sizeof(_ports),
&_ports);
if (pptr == NULL)
return EBT_NOMATCH;
return false;
if (info->bitmask & EBT_IP6_DPORT) {
u32 dst = ntohs(pptr->dst);
if (FWINV(dst < info->dport[0] ||
dst > info->dport[1], EBT_IP6_DPORT))
return EBT_NOMATCH;
return false;
}
if (info->bitmask & EBT_IP6_SPORT) {
u32 src = ntohs(pptr->src);
if (FWINV(src < info->sport[0] ||
src > info->sport[1], EBT_IP6_SPORT))
return EBT_NOMATCH;
return false;
}
return EBT_MATCH;
return true;
}
return EBT_MATCH;
return true;
}
static bool ebt_ip6_check(const char *tablename, unsigned int hookmask,

6
net/bridge/netfilter/ebt_limit.c
View File

@ -30,7 +30,7 @@ static DEFINE_SPINLOCK(limit_lock);
#define CREDITS_PER_JIFFY POW2_BELOW32(MAX_CPJ)
static int ebt_limit_match(const struct sk_buff *skb,
static bool ebt_limit_match(const struct sk_buff *skb,
const struct net_device *in, const struct net_device *out,
const void *data, unsigned int datalen)
{
@ -46,11 +46,11 @@ static int ebt_limit_match(const struct sk_buff *skb,
/* We're not limited. */
info->credit -= info->cost;
spin_unlock_bh(&limit_lock);
return EBT_MATCH;
return true;
}
spin_unlock_bh(&limit_lock);
return EBT_NOMATCH;
return false;
}
/* Precision saver. */

6
net/bridge/netfilter/ebt_mark_m.c
View File

@ -12,15 +12,15 @@
#include <linux/netfilter_bridge/ebtables.h>
#include <linux/netfilter_bridge/ebt_mark_m.h>
static int ebt_filter_mark(const struct sk_buff *skb,
static bool ebt_filter_mark(const struct sk_buff *skb,
const struct net_device *in, const struct net_device *out, const void *data,
unsigned int datalen)
{
const struct ebt_mark_m_info *info = data;
if (info->bitmask & EBT_MARK_OR)
return !(!!(skb->mark & info->mask) ^ info->invert);
return !(((skb->mark & info->mask) == info->mark) ^ info->invert);
return !!(skb->mark & info->mask) ^ info->invert;
return ((skb->mark & info->mask) == info->mark) ^ info->invert;
}
static bool ebt_mark_check(const char *tablename, unsigned int hookmask,

4
net/bridge/netfilter/ebt_pkttype.c
View File

@ -12,7 +12,7 @@
#include <linux/netfilter_bridge/ebtables.h>
#include <linux/netfilter_bridge/ebt_pkttype.h>
static int ebt_filter_pkttype(const struct sk_buff *skb,
static bool ebt_filter_pkttype(const struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
const void *data,
@ -20,7 +20,7 @@ static int ebt_filter_pkttype(const struct sk_buff *skb,
{
const struct ebt_pkttype_info *info = data;
return (skb->pkt_type != info->pkt_type) ^ info->invert;
return (skb->pkt_type == info->pkt_type) ^ info->invert;
}
static bool ebt_pkttype_check(const char *tablename, unsigned int hookmask,

39
net/bridge/netfilter/ebt_stp.c
View File

@ -40,7 +40,7 @@ struct stp_config_pdu {
#define NR16(p) (p[0] << 8 | p[1])
#define NR32(p) ((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3])
static int ebt_filter_config(const struct ebt_stp_info *info,
static bool ebt_filter_config(const struct ebt_stp_info *info,
const struct stp_config_pdu *stpc)
{
const struct ebt_stp_config_info *c;
@ -51,12 +51,12 @@ static int ebt_filter_config(const struct ebt_stp_info *info,
c = &info->config;
if ((info->bitmask & EBT_STP_FLAGS) &&
FWINV(c->flags != stpc->flags, EBT_STP_FLAGS))
return EBT_NOMATCH;
return false;
if (info->bitmask & EBT_STP_ROOTPRIO) {
v16 = NR16(stpc->root);
if (FWINV(v16 < c->root_priol ||
v16 > c->root_priou, EBT_STP_ROOTPRIO))
return EBT_NOMATCH;
return false;
}
if (info->bitmask & EBT_STP_ROOTADDR) {
verdict = 0;
@ -64,19 +64,19 @@ static int ebt_filter_config(const struct ebt_stp_info *info,
verdict |= (stpc->root[2+i] ^ c->root_addr[i]) &
c->root_addrmsk[i];
if (FWINV(verdict != 0, EBT_STP_ROOTADDR))
return EBT_NOMATCH;
return false;
}
if (info->bitmask & EBT_STP_ROOTCOST) {
v32 = NR32(stpc->root_cost);
if (FWINV(v32 < c->root_costl ||
v32 > c->root_costu, EBT_STP_ROOTCOST))
return EBT_NOMATCH;
return false;
}
if (info->bitmask & EBT_STP_SENDERPRIO) {
v16 = NR16(stpc->sender);
if (FWINV(v16 < c->sender_priol ||
v16 > c->sender_priou, EBT_STP_SENDERPRIO))
return EBT_NOMATCH;
return false;
}
if (info->bitmask & EBT_STP_SENDERADDR) {
verdict = 0;
@ -84,42 +84,43 @@ static int ebt_filter_config(const struct ebt_stp_info *info,
verdict |= (stpc->sender[2+i] ^ c->sender_addr[i]) &
c->sender_addrmsk[i];
if (FWINV(verdict != 0, EBT_STP_SENDERADDR))
return EBT_NOMATCH;
return false;
}
if (info->bitmask & EBT_STP_PORT) {
v16 = NR16(stpc->port);
if (FWINV(v16 < c->portl ||
v16 > c->portu, EBT_STP_PORT))
return EBT_NOMATCH;
return false;
}
if (info->bitmask & EBT_STP_MSGAGE) {
v16 = NR16(stpc->msg_age);
if (FWINV(v16 < c->msg_agel ||
v16 > c->msg_ageu, EBT_STP_MSGAGE))
return EBT_NOMATCH;
return false;
}
if (info->bitmask & EBT_STP_MAXAGE) {
v16 = NR16(stpc->max_age);
if (FWINV(v16 < c->max_agel ||
v16 > c->max_ageu, EBT_STP_MAXAGE))
return EBT_NOMATCH;
return false;
}
if (info->bitmask & EBT_STP_HELLOTIME) {
v16 = NR16(stpc->hello_time);
if (FWINV(v16 < c->hello_timel ||
v16 > c->hello_timeu, EBT_STP_HELLOTIME))
return EBT_NOMATCH;
return false;
}
if (info->bitmask & EBT_STP_FWDD) {
v16 = NR16(stpc->forward_delay);
if (FWINV(v16 < c->forward_delayl ||
v16 > c->forward_delayu, EBT_STP_FWDD))
return EBT_NOMATCH;
return false;
}
return EBT_MATCH;
return true;
}
static int ebt_filter_stp(const struct sk_buff *skb, const struct net_device *in,
static bool ebt_filter_stp(const struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out, const void *data, unsigned int datalen)
{
const struct ebt_stp_info *info = data;
@ -129,15 +130,15 @@ static int ebt_filter_stp(const struct sk_buff *skb, const struct net_device *in
sp = skb_header_pointer(skb, 0, sizeof(_stph), &_stph);
if (sp == NULL)
return EBT_NOMATCH;
return false;
/* The stp code only considers these */
if (memcmp(sp, header, sizeof(header)))
return EBT_NOMATCH;
return false;
if (info->bitmask & EBT_STP_TYPE
&& FWINV(info->type != sp->type, EBT_STP_TYPE))
return EBT_NOMATCH;
return false;
if (sp->type == BPDU_TYPE_CONFIG &&
info->bitmask & EBT_STP_CONFIG_MASK) {
@ -147,10 +148,10 @@ static int ebt_filter_stp(const struct sk_buff *skb, const struct net_device *in
st = skb_header_pointer(skb, sizeof(_stph),
sizeof(_stpc), &_stpc);
if (st == NULL)
return EBT_NOMATCH;
return false;
return ebt_filter_config(info, st);
}
return EBT_MATCH;
return true;
}
static bool ebt_stp_check(const char *tablename, unsigned int hookmask,

8
net/bridge/netfilter/ebt_vlan.c
View File

@ -38,9 +38,9 @@ MODULE_LICENSE("GPL");
#define DEBUG_MSG(args...) if (debug) printk (KERN_DEBUG "ebt_vlan: " args)
#define GET_BITMASK(_BIT_MASK_) info->bitmask & _BIT_MASK_
#define EXIT_ON_MISMATCH(_MATCH_,_MASK_) {if (!((info->_MATCH_ == _MATCH_)^!!(info->invflags & _MASK_))) return EBT_NOMATCH;}
#define EXIT_ON_MISMATCH(_MATCH_,_MASK_) {if (!((info->_MATCH_ == _MATCH_)^!!(info->invflags & _MASK_))) return false; }
static int
static bool
ebt_filter_vlan(const struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
@ -58,7 +58,7 @@ ebt_filter_vlan(const struct sk_buff *skb,
fp = skb_header_pointer(skb, 0, sizeof(_frame), &_frame);
if (fp == NULL)
return EBT_NOMATCH;
return false;
/* Tag Control Information (TCI) consists of the following elements:
* - User_priority. The user_priority field is three bits in length,
@ -84,7 +84,7 @@ ebt_filter_vlan(const struct sk_buff *skb,
if (GET_BITMASK(EBT_VLAN_ENCAP))
EXIT_ON_MISMATCH(encap, EBT_VLAN_ENCAP);
return EBT_MATCH;
return true;
}
static bool