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netfilter: change return types of check functions for Ebtables extensions

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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 18219d3f7d
commit 19eda879a1
20 changed files with 109 additions and 108 deletions
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9
include/linux/netfilter_bridge/ebtables.h
View File

@ -211,8 +211,7 @@ struct ebt_match
int (*match)(const struct sk_buff *skb, const struct net_device *in,
const struct net_device *out, const void *matchdata,
unsigned int datalen);
/* 0 == let it in */
int (*check)(const char *tablename, unsigned int hookmask,
bool (*check)(const char *tablename, unsigned int hookmask,
const struct ebt_entry *e, void *matchdata, unsigned int datalen);
void (*destroy)(void *matchdata, unsigned int datalen);
unsigned int matchsize;
@ -226,8 +225,7 @@ struct ebt_watcher
void (*watcher)(const struct sk_buff *skb, unsigned int hooknr,
const struct net_device *in, const struct net_device *out,
const void *watcherdata, unsigned int datalen);
/* 0 == let it in */
int (*check)(const char *tablename, unsigned int hookmask,
bool (*check)(const char *tablename, unsigned int hookmask,
const struct ebt_entry *e, void *watcherdata, unsigned int datalen);
void (*destroy)(void *watcherdata, unsigned int datalen);
unsigned int targetsize;
@ -242,8 +240,7 @@ struct ebt_target
int (*target)(struct sk_buff *skb, unsigned int hooknr,
const struct net_device *in, const struct net_device *out,
const void *targetdata, unsigned int datalen);
/* 0 == let it in */
int (*check)(const char *tablename, unsigned int hookmask,
bool (*check)(const char *tablename, unsigned int hookmask,
const struct ebt_entry *e, void *targetdata, unsigned int datalen);
void (*destroy)(void *targetdata, unsigned int datalen);
unsigned int targetsize;

6
net/bridge/netfilter/ebt_802_3.c
View File

@ -37,15 +37,15 @@ static int ebt_filter_802_3(const struct sk_buff *skb, const struct net_device *
}
static struct ebt_match filter_802_3;
static int ebt_802_3_check(const char *tablename, unsigned int hookmask,
static bool ebt_802_3_check(const char *tablename, unsigned int hookmask,
const struct ebt_entry *e, void *data, unsigned int datalen)
{
const struct ebt_802_3_info *info = data;
if (info->bitmask & ~EBT_802_3_MASK || info->invflags & ~EBT_802_3_MASK)
return -EINVAL;
return false;
return 0;
return true;
}
static struct ebt_match filter_802_3 __read_mostly = {

15
net/bridge/netfilter/ebt_among.c
View File

@ -177,9 +177,10 @@ static int ebt_filter_among(const struct sk_buff *skb,
return EBT_MATCH;
}
static int ebt_among_check(const char *tablename, unsigned int hookmask,
const struct ebt_entry *e, void *data,
unsigned int datalen)
static bool
ebt_among_check(const char *tablename, unsigned int hookmask,
const struct ebt_entry *e, void *data,
unsigned int datalen)
{
const struct ebt_among_info *info = data;
int expected_length = sizeof(struct ebt_among_info);
@ -197,19 +198,19 @@ static int ebt_among_check(const char *tablename, unsigned int hookmask,
"against expected %d, rounded to %Zd\n",
datalen, expected_length,
EBT_ALIGN(expected_length));
return -EINVAL;
return false;
}
if (wh_dst && (err = ebt_mac_wormhash_check_integrity(wh_dst))) {
printk(KERN_WARNING
"ebtables: among: dst integrity fail: %x\n", -err);
return -EINVAL;
return false;
}
if (wh_src && (err = ebt_mac_wormhash_check_integrity(wh_src))) {
printk(KERN_WARNING
"ebtables: among: src integrity fail: %x\n", -err);
return -EINVAL;
return false;
}
return 0;
return true;
}
static struct ebt_match filter_among __read_mostly = {

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

@ -100,7 +100,7 @@ static int ebt_filter_arp(const struct sk_buff *skb, const struct net_device *in
return EBT_MATCH;
}
static int ebt_arp_check(const char *tablename, unsigned int hookmask,
static bool ebt_arp_check(const char *tablename, unsigned int hookmask,
const struct ebt_entry *e, void *data, unsigned int datalen)
{
const struct ebt_arp_info *info = data;
@ -108,10 +108,10 @@ static int ebt_arp_check(const char *tablename, unsigned int hookmask,
if ((e->ethproto != htons(ETH_P_ARP) &&
e->ethproto != htons(ETH_P_RARP)) ||
e->invflags & EBT_IPROTO)
return -EINVAL;
return false;
if (info->bitmask & ~EBT_ARP_MASK || info->invflags & ~EBT_ARP_MASK)
return -EINVAL;
return 0;
return false;
return true;
}
static struct ebt_match filter_arp __read_mostly = {

10
net/bridge/netfilter/ebt_arpreply.c
View File

@ -58,20 +58,20 @@ static int ebt_target_reply(struct sk_buff *skb, unsigned int hooknr,
return info->target;
}
static int ebt_target_reply_check(const char *tablename, unsigned int hookmask,
static bool ebt_target_reply_check(const char *tablename, unsigned int hookmask,
const struct ebt_entry *e, void *data, unsigned int datalen)
{
const struct ebt_arpreply_info *info = data;
if (BASE_CHAIN && info->target == EBT_RETURN)
return -EINVAL;
return false;
if (e->ethproto != htons(ETH_P_ARP) ||
e->invflags & EBT_IPROTO)
return -EINVAL;
return false;
CLEAR_BASE_CHAIN_BIT;
if (strcmp(tablename, "nat") || hookmask & ~(1 << NF_BR_PRE_ROUTING))
return -EINVAL;
return 0;
return false;
return true;
}
static struct ebt_target reply_target __read_mostly = {

10
net/bridge/netfilter/ebt_dnat.c
View File

@ -27,21 +27,21 @@ static int ebt_target_dnat(struct sk_buff *skb, unsigned int hooknr,
return info->target;
}
static int ebt_target_dnat_check(const char *tablename, unsigned int hookmask,
static bool ebt_target_dnat_check(const char *tablename, unsigned int hookmask,
const struct ebt_entry *e, void *data, unsigned int datalen)
{
const struct ebt_nat_info *info = data;
if (BASE_CHAIN && info->target == EBT_RETURN)
return -EINVAL;
return false;
CLEAR_BASE_CHAIN_BIT;
if ( (strcmp(tablename, "nat") ||
(hookmask & ~((1 << NF_BR_PRE_ROUTING) | (1 << NF_BR_LOCAL_OUT)))) &&
(strcmp(tablename, "broute") || hookmask & ~(1 << NF_BR_BROUTING)) )
return -EINVAL;
return false;
if (INVALID_TARGET)
return -EINVAL;
return 0;
return false;
return true;
}
static struct ebt_target dnat __read_mostly = {

16
net/bridge/netfilter/ebt_ip.c
View File

@ -78,31 +78,31 @@ static int ebt_filter_ip(const struct sk_buff *skb, const struct net_device *in,
return EBT_MATCH;
}
static int ebt_ip_check(const char *tablename, unsigned int hookmask,
static bool ebt_ip_check(const char *tablename, unsigned int hookmask,
const struct ebt_entry *e, void *data, unsigned int datalen)
{
const struct ebt_ip_info *info = data;
if (e->ethproto != htons(ETH_P_IP) ||
e->invflags & EBT_IPROTO)
return -EINVAL;
return false;
if (info->bitmask & ~EBT_IP_MASK || info->invflags & ~EBT_IP_MASK)
return -EINVAL;
return false;
if (info->bitmask & (EBT_IP_DPORT | EBT_IP_SPORT)) {
if (info->invflags & EBT_IP_PROTO)
return -EINVAL;
return false;
if (info->protocol != IPPROTO_TCP &&
info->protocol != IPPROTO_UDP &&
info->protocol != IPPROTO_UDPLITE &&
info->protocol != IPPROTO_SCTP &&
info->protocol != IPPROTO_DCCP)
return -EINVAL;
return false;
}
if (info->bitmask & EBT_IP_DPORT && info->dport[0] > info->dport[1])
return -EINVAL;
return false;
if (info->bitmask & EBT_IP_SPORT && info->sport[0] > info->sport[1])
return -EINVAL;
return 0;
return false;
return true;
}
static struct ebt_match filter_ip __read_mostly = {

16
net/bridge/netfilter/ebt_ip6.c
View File

@ -92,30 +92,30 @@ static int ebt_filter_ip6(const struct sk_buff *skb,
return EBT_MATCH;
}
static int ebt_ip6_check(const char *tablename, unsigned int hookmask,
static bool ebt_ip6_check(const char *tablename, unsigned int hookmask,
const struct ebt_entry *e, void *data, unsigned int datalen)
{
struct ebt_ip6_info *info = (struct ebt_ip6_info *)data;
if (e->ethproto != htons(ETH_P_IPV6) || e->invflags & EBT_IPROTO)
return -EINVAL;
return false;
if (info->bitmask & ~EBT_IP6_MASK || info->invflags & ~EBT_IP6_MASK)
return -EINVAL;
return false;
if (info->bitmask & (EBT_IP6_DPORT | EBT_IP6_SPORT)) {
if (info->invflags & EBT_IP6_PROTO)
return -EINVAL;
return false;
if (info->protocol != IPPROTO_TCP &&
info->protocol != IPPROTO_UDP &&
info->protocol != IPPROTO_UDPLITE &&
info->protocol != IPPROTO_SCTP &&
info->protocol != IPPROTO_DCCP)
return -EINVAL;
return false;
}
if (info->bitmask & EBT_IP6_DPORT && info->dport[0] > info->dport[1])
return -EINVAL;
return false;
if (info->bitmask & EBT_IP6_SPORT && info->sport[0] > info->sport[1])
return -EINVAL;
return 0;
return false;
return true;
}
static struct ebt_match filter_ip6 =

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

@ -65,7 +65,7 @@ user2credits(u_int32_t user)
return (user * HZ * CREDITS_PER_JIFFY) / EBT_LIMIT_SCALE;
}
static int ebt_limit_check(const char *tablename, unsigned int hookmask,
static bool ebt_limit_check(const char *tablename, unsigned int hookmask,
const struct ebt_entry *e, void *data, unsigned int datalen)
{
struct ebt_limit_info *info = data;
@ -75,7 +75,7 @@ static int ebt_limit_check(const char *tablename, unsigned int hookmask,
user2credits(info->avg * info->burst) < user2credits(info->avg)) {
printk("Overflow in ebt_limit, try lower: %u/%u\n",
info->avg, info->burst);
return -EINVAL;
return false;
}
/* User avg in seconds * EBT_LIMIT_SCALE: convert to jiffies * 128. */
@ -83,7 +83,7 @@ static int ebt_limit_check(const char *tablename, unsigned int hookmask,
info->credit = user2credits(info->avg * info->burst);
info->credit_cap = user2credits(info->avg * info->burst);
info->cost = user2credits(info->avg);
return 0;
return true;
}
static struct ebt_match ebt_limit_reg __read_mostly = {

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

@ -24,17 +24,17 @@
static DEFINE_SPINLOCK(ebt_log_lock);
static int ebt_log_check(const char *tablename, unsigned int hookmask,
static bool ebt_log_check(const char *tablename, unsigned int hookmask,
const struct ebt_entry *e, void *data, unsigned int datalen)
{
struct ebt_log_info *info = data;
if (info->bitmask & ~EBT_LOG_MASK)
return -EINVAL;
return false;
if (info->loglevel >= 8)
return -EINVAL;
return false;
info->prefix[EBT_LOG_PREFIX_SIZE - 1] = '\0';
return 0;
return true;
}
struct tcpudphdr

10
net/bridge/netfilter/ebt_mark.c
View File

@ -37,7 +37,7 @@ static int ebt_target_mark(struct sk_buff *skb, unsigned int hooknr,
return info->target | ~EBT_VERDICT_BITS;
}
static int ebt_target_mark_check(const char *tablename, unsigned int hookmask,
static bool ebt_target_mark_check(const char *tablename, unsigned int hookmask,
const struct ebt_entry *e, void *data, unsigned int datalen)
{
const struct ebt_mark_t_info *info = data;
@ -45,15 +45,15 @@ static int ebt_target_mark_check(const char *tablename, unsigned int hookmask,
tmp = info->target | ~EBT_VERDICT_BITS;
if (BASE_CHAIN && tmp == EBT_RETURN)
return -EINVAL;
return false;
CLEAR_BASE_CHAIN_BIT;
if (tmp < -NUM_STANDARD_TARGETS || tmp >= 0)
return -EINVAL;
return false;
tmp = info->target & ~EBT_VERDICT_BITS;
if (tmp != MARK_SET_VALUE && tmp != MARK_OR_VALUE &&
tmp != MARK_AND_VALUE && tmp != MARK_XOR_VALUE)
return -EINVAL;
return 0;
return false;
return true;
}
static struct ebt_target mark_target __read_mostly = {

10
net/bridge/netfilter/ebt_mark_m.c
View File

@ -23,18 +23,18 @@ static int ebt_filter_mark(const struct sk_buff *skb,
return !(((skb->mark & info->mask) == info->mark) ^ info->invert);
}
static int ebt_mark_check(const char *tablename, unsigned int hookmask,
static bool ebt_mark_check(const char *tablename, unsigned int hookmask,
const struct ebt_entry *e, void *data, unsigned int datalen)
{
const struct ebt_mark_m_info *info = data;
if (info->bitmask & ~EBT_MARK_MASK)
return -EINVAL;
return false;
if ((info->bitmask & EBT_MARK_OR) && (info->bitmask & EBT_MARK_AND))
return -EINVAL;
return false;
if (!info->bitmask)
return -EINVAL;
return 0;
return false;
return true;
}
static struct ebt_match filter_mark __read_mostly = {

12
net/bridge/netfilter/ebt_nflog.c
View File

@ -36,17 +36,17 @@ static void ebt_nflog(const struct sk_buff *skb,
nf_log_packet(PF_BRIDGE, hooknr, skb, in, out, &li, "%s", info->prefix);
}
static int ebt_nflog_check(const char *tablename,
unsigned int hookmask,
const struct ebt_entry *e,
void *data, unsigned int datalen)
static bool ebt_nflog_check(const char *tablename,
unsigned int hookmask,
const struct ebt_entry *e,
void *data, unsigned int datalen)
{
struct ebt_nflog_info *info = (struct ebt_nflog_info *)data;
if (info->flags & ~EBT_NFLOG_MASK)
return -EINVAL;
return false;
info->prefix[EBT_NFLOG_PREFIX_SIZE - 1] = '\0';
return 0;
return true;
}
static struct ebt_watcher nflog __read_mostly = {

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

@ -23,15 +23,15 @@ static int ebt_filter_pkttype(const struct sk_buff *skb,
return (skb->pkt_type != info->pkt_type) ^ info->invert;
}
static int ebt_pkttype_check(const char *tablename, unsigned int hookmask,
static bool ebt_pkttype_check(const char *tablename, unsigned int hookmask,
const struct ebt_entry *e, void *data, unsigned int datalen)
{
const struct ebt_pkttype_info *info = data;
if (info->invert != 0 && info->invert != 1)
return -EINVAL;
return false;
/* Allow any pkt_type value */
return 0;
return true;
}
static struct ebt_match filter_pkttype __read_mostly = {

10
net/bridge/netfilter/ebt_redirect.c
View File

@ -33,20 +33,20 @@ static int ebt_target_redirect(struct sk_buff *skb, unsigned int hooknr,
return info->target;
}
static int ebt_target_redirect_check(const char *tablename, unsigned int hookmask,
static bool ebt_target_redirect_check(const char *tablename, unsigned int hookmask,
const struct ebt_entry *e, void *data, unsigned int datalen)
{
const struct ebt_redirect_info *info = data;
if (BASE_CHAIN && info->target == EBT_RETURN)
return -EINVAL;
return false;
CLEAR_BASE_CHAIN_BIT;
if ( (strcmp(tablename, "nat") || hookmask & ~(1 << NF_BR_PRE_ROUTING)) &&
(strcmp(tablename, "broute") || hookmask & ~(1 << NF_BR_BROUTING)) )
return -EINVAL;
return false;
if (INVALID_TARGET)
return -EINVAL;
return 0;
return false;
return true;
}
static struct ebt_target redirect_target __read_mostly = {

14
net/bridge/netfilter/ebt_snat.c
View File

@ -43,7 +43,7 @@ out:
return info->target | ~EBT_VERDICT_BITS;
}
static int ebt_target_snat_check(const char *tablename, unsigned int hookmask,
static bool ebt_target_snat_check(const char *tablename, unsigned int hookmask,
const struct ebt_entry *e, void *data, unsigned int datalen)
{
const struct ebt_nat_info *info = data;
@ -51,19 +51,19 @@ static int ebt_target_snat_check(const char *tablename, unsigned int hookmask,
tmp = info->target | ~EBT_VERDICT_BITS;
if (BASE_CHAIN && tmp == EBT_RETURN)
return -EINVAL;
return false;
CLEAR_BASE_CHAIN_BIT;
if (strcmp(tablename, "nat"))
return -EINVAL;
return false;
if (hookmask & ~(1 << NF_BR_POST_ROUTING))
return -EINVAL;
return false;
if (tmp < -NUM_STANDARD_TARGETS || tmp >= 0)
return -EINVAL;
return false;
tmp = info->target | EBT_VERDICT_BITS;
if ((tmp & ~NAT_ARP_BIT) != ~NAT_ARP_BIT)
return -EINVAL;
return 0;
return false;
return true;
}
static struct ebt_target snat __read_mostly = {

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

@ -153,7 +153,7 @@ static int ebt_filter_stp(const struct sk_buff *skb, const struct net_device *in
return EBT_MATCH;
}
static int ebt_stp_check(const char *tablename, unsigned int hookmask,
static bool ebt_stp_check(const char *tablename, unsigned int hookmask,
const struct ebt_entry *e, void *data, unsigned int datalen)
{
const struct ebt_stp_info *info = data;
@ -162,13 +162,13 @@ static int ebt_stp_check(const char *tablename, unsigned int hookmask,
if (info->bitmask & ~EBT_STP_MASK || info->invflags & ~EBT_STP_MASK ||
!(info->bitmask & EBT_STP_MASK))
return -EINVAL;
return false;
/* Make sure the match only receives stp frames */
if (compare_ether_addr(e->destmac, bridge_ula) ||
compare_ether_addr(e->destmsk, msk) || !(e->bitmask & EBT_DESTMAC))
return -EINVAL;
return false;
return 0;
return true;
}
static struct ebt_match filter_stp __read_mostly = {

21
net/bridge/netfilter/ebt_ulog.c
View File

@ -255,14 +255,13 @@ static void ebt_ulog(const struct sk_buff *skb, unsigned int hooknr,
ebt_ulog_packet(hooknr, skb, in, out, uloginfo, NULL);
}
static int ebt_ulog_check(const char *tablename, unsigned int hookmask,
static bool ebt_ulog_check(const char *tablename, unsigned int hookmask,
const struct ebt_entry *e, void *data, unsigned int datalen)
{
struct ebt_ulog_info *uloginfo = data;
if (uloginfo->nlgroup > 31)
return -EINVAL;
return false;
uloginfo->prefix[EBT_ULOG_PREFIX_LEN - 1] = '\0';
@ -288,12 +287,13 @@ static const struct nf_logger ebt_ulog_logger = {
static int __init ebt_ulog_init(void)
{
int i, ret = 0;
bool ret = true;
int i;
if (nlbufsiz >= 128*1024) {
printk(KERN_NOTICE "ebt_ulog: Netlink buffer has to be <= 128kB,"
" please try a smaller nlbufsiz parameter.\n");
return -EINVAL;
return false;
}
/* initialize ulog_buffers */
@ -305,12 +305,15 @@ static int __init ebt_ulog_init(void)
ebtulognl = netlink_kernel_create(&init_net, NETLINK_NFLOG,
EBT_ULOG_MAXNLGROUPS, NULL, NULL,
THIS_MODULE);
if (!ebtulognl)
ret = -ENOMEM;
else if ((ret = ebt_register_watcher(&ulog)))
if (!ebtulognl) {
printk(KERN_WARNING KBUILD_MODNAME ": out of memory trying to "
"call netlink_kernel_create\n");
ret = false;
} else if (ebt_register_watcher(&ulog) != 0) {
netlink_kernel_release(ebtulognl);
}
if (ret == 0)
if (ret)
nf_log_register(NFPROTO_BRIDGE, &ebt_ulog_logger);
return ret;

16
net/bridge/netfilter/ebt_vlan.c
View File

@ -87,7 +87,7 @@ ebt_filter_vlan(const struct sk_buff *skb,
return EBT_MATCH;
}
static int
static bool
ebt_check_vlan(const char *tablename,
unsigned int hooknr,
const struct ebt_entry *e, void *data, unsigned int datalen)
@ -99,7 +99,7 @@ ebt_check_vlan(const char *tablename,
DEBUG_MSG
("passed entry proto %2.4X is not 802.1Q (8100)\n",
(unsigned short) ntohs(e->ethproto));
return -EINVAL;
return false;
}
/* Check for bitmask range
@ -107,14 +107,14 @@ ebt_check_vlan(const char *tablename,
if (info->bitmask & ~EBT_VLAN_MASK) {
DEBUG_MSG("bitmask %2X is out of mask (%2X)\n",
info->bitmask, EBT_VLAN_MASK);
return -EINVAL;
return false;
}
/* Check for inversion flags range */
if (info->invflags & ~EBT_VLAN_MASK) {
DEBUG_MSG("inversion flags %2X is out of mask (%2X)\n",
info->invflags, EBT_VLAN_MASK);
return -EINVAL;
return false;
}
/* Reserved VLAN ID (VID) values
@ -129,7 +129,7 @@ ebt_check_vlan(const char *tablename,
DEBUG_MSG
("id %d is out of range (1-4096)\n",
info->id);
return -EINVAL;
return false;
}
/* Note: This is valid VLAN-tagged frame point.
* Any value of user_priority are acceptable,
@ -144,7 +144,7 @@ ebt_check_vlan(const char *tablename,
if ((unsigned char) info->prio > 7) {
DEBUG_MSG("prio %d is out of range (0-7)\n",
info->prio);
return -EINVAL;
return false;
}
}
/* Check for encapsulated proto range - it is possible to be
@ -155,11 +155,11 @@ ebt_check_vlan(const char *tablename,
DEBUG_MSG
("encap frame length %d is less than minimal\n",
ntohs(info->encap));
return -EINVAL;
return false;
}
}
return 0;
return true;
}
static struct ebt_match filter_vlan __read_mostly = {

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

@ -365,7 +365,7 @@ ebt_check_match(struct ebt_entry_match *m, struct ebt_entry *e,
return -EINVAL;
}
if (match->check &&
match->check(name, hookmask, e, m->data, m->match_size) != 0) {
!match->check(name, hookmask, e, m->data, m->match_size)) {
BUGPRINT("match->check failed\n");
module_put(match->me);
return -EINVAL;
@ -403,7 +403,7 @@ ebt_check_watcher(struct ebt_entry_watcher *w, struct ebt_entry *e,
return -EINVAL;
}
if (watcher->check &&
watcher->check(name, hookmask, e, w->data, w->watcher_size) != 0) {
!watcher->check(name, hookmask, e, w->data, w->watcher_size)) {
BUGPRINT("watcher->check failed\n");
module_put(watcher->me);
return -EINVAL;
@ -716,7 +716,7 @@ ebt_check_entry(struct ebt_entry *e, struct ebt_table_info *newinfo,
ret = -EINVAL;
goto cleanup_watchers;
} else if (t->u.target->check &&
t->u.target->check(name, hookmask, e, t->data, t->target_size) != 0) {
!t->u.target->check(name, hookmask, e, t->data, t->target_size)) {
module_put(t->u.target->me);
ret = -EFAULT;
goto cleanup_watchers;