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-rw-r--r--net/ipv4/netfilter/arp_tables.c109
-rw-r--r--net/ipv4/netfilter/ip_queue.c2
-rw-r--r--net/ipv4/netfilter/ip_tables.c172
-rw-r--r--net/ipv4/netfilter/ipt_MASQUERADE.c12
-rw-r--r--net/ipv4/netfilter/nf_conntrack_proto_icmp.c17
5 files changed, 149 insertions, 163 deletions
diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c
index 831fe1879dc..7505dff4ffd 100644
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -231,6 +231,12 @@ static inline struct arpt_entry *get_entry(void *base, unsigned int offset)
return (struct arpt_entry *)(base + offset);
}
+static inline __pure
+struct arpt_entry *arpt_next_entry(const struct arpt_entry *entry)
+{
+ return (void *)entry + entry->next_offset;
+}
+
unsigned int arpt_do_table(struct sk_buff *skb,
unsigned int hook,
const struct net_device *in,
@@ -267,67 +273,64 @@ unsigned int arpt_do_table(struct sk_buff *skb,
arp = arp_hdr(skb);
do {
- if (arp_packet_match(arp, skb->dev, indev, outdev, &e->arp)) {
- struct arpt_entry_target *t;
- int hdr_len;
-
- hdr_len = sizeof(*arp) + (2 * sizeof(struct in_addr)) +
- (2 * skb->dev->addr_len);
+ struct arpt_entry_target *t;
+ int hdr_len;
- ADD_COUNTER(e->counters, hdr_len, 1);
+ if (!arp_packet_match(arp, skb->dev, indev, outdev, &e->arp)) {
+ e = arpt_next_entry(e);
+ continue;
+ }
- t = arpt_get_target(e);
+ hdr_len = sizeof(*arp) + (2 * sizeof(struct in_addr)) +
+ (2 * skb->dev->addr_len);
+ ADD_COUNTER(e->counters, hdr_len, 1);
- /* Standard target? */
- if (!t->u.kernel.target->target) {
- int v;
+ t = arpt_get_target(e);
- v = ((struct arpt_standard_target *)t)->verdict;
- if (v < 0) {
- /* Pop from stack? */
- if (v != ARPT_RETURN) {
- verdict = (unsigned)(-v) - 1;
- break;
- }
- e = back;
- back = get_entry(table_base,
- back->comefrom);
- continue;
- }
- if (table_base + v
- != (void *)e + e->next_offset) {
- /* Save old back ptr in next entry */
- struct arpt_entry *next
- = (void *)e + e->next_offset;
- next->comefrom =
- (void *)back - table_base;
-
- /* set back pointer to next entry */
- back = next;
- }
+ /* Standard target? */
+ if (!t->u.kernel.target->target) {
+ int v;
- e = get_entry(table_base, v);
- } else {
- /* Targets which reenter must return
- * abs. verdicts
- */
- tgpar.target = t->u.kernel.target;
- tgpar.targinfo = t->data;
- verdict = t->u.kernel.target->target(skb,
- &tgpar);
-
- /* Target might have changed stuff. */
- arp = arp_hdr(skb);
-
- if (verdict == ARPT_CONTINUE)
- e = (void *)e + e->next_offset;
- else
- /* Verdict */
+ v = ((struct arpt_standard_target *)t)->verdict;
+ if (v < 0) {
+ /* Pop from stack? */
+ if (v != ARPT_RETURN) {
+ verdict = (unsigned)(-v) - 1;
break;
+ }
+ e = back;
+ back = get_entry(table_base, back->comefrom);
+ continue;
}
- } else {
- e = (void *)e + e->next_offset;
+ if (table_base + v
+ != arpt_next_entry(e)) {
+ /* Save old back ptr in next entry */
+ struct arpt_entry *next = arpt_next_entry(e);
+ next->comefrom = (void *)back - table_base;
+
+ /* set back pointer to next entry */
+ back = next;
+ }
+
+ e = get_entry(table_base, v);
+ continue;
}
+
+ /* Targets which reenter must return
+ * abs. verdicts
+ */
+ tgpar.target = t->u.kernel.target;
+ tgpar.targinfo = t->data;
+ verdict = t->u.kernel.target->target(skb, &tgpar);
+
+ /* Target might have changed stuff. */
+ arp = arp_hdr(skb);
+
+ if (verdict == ARPT_CONTINUE)
+ e = arpt_next_entry(e);
+ else
+ /* Verdict */
+ break;
} while (!hotdrop);
xt_info_rdunlock_bh();
diff --git a/net/ipv4/netfilter/ip_queue.c b/net/ipv4/netfilter/ip_queue.c
index 5f22c91c6e1..c156db21598 100644
--- a/net/ipv4/netfilter/ip_queue.c
+++ b/net/ipv4/netfilter/ip_queue.c
@@ -596,7 +596,7 @@ static int __init ip_queue_init(void)
#ifdef CONFIG_SYSCTL
ipq_sysctl_header = register_sysctl_paths(net_ipv4_ctl_path, ipq_table);
#endif
- status = nf_register_queue_handler(PF_INET, &nfqh);
+ status = nf_register_queue_handler(NFPROTO_IPV4, &nfqh);
if (status < 0) {
printk(KERN_ERR "ip_queue: failed to register queue handler\n");
goto cleanup_sysctl;
diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c
index 2ec8d7290c4..5bf7c3f185d 100644
--- a/net/ipv4/netfilter/ip_tables.c
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -238,8 +238,8 @@ static struct nf_loginfo trace_loginfo = {
/* Mildly perf critical (only if packet tracing is on) */
static inline int
get_chainname_rulenum(struct ipt_entry *s, struct ipt_entry *e,
- char *hookname, char **chainname,
- char **comment, unsigned int *rulenum)
+ const char *hookname, const char **chainname,
+ const char **comment, unsigned int *rulenum)
{
struct ipt_standard_target *t = (void *)ipt_get_target(s);
@@ -257,8 +257,8 @@ get_chainname_rulenum(struct ipt_entry *s, struct ipt_entry *e,
&& unconditional(&s->ip)) {
/* Tail of chains: STANDARD target (return/policy) */
*comment = *chainname == hookname
- ? (char *)comments[NF_IP_TRACE_COMMENT_POLICY]
- : (char *)comments[NF_IP_TRACE_COMMENT_RETURN];
+ ? comments[NF_IP_TRACE_COMMENT_POLICY]
+ : comments[NF_IP_TRACE_COMMENT_RETURN];
}
return 1;
} else
@@ -277,14 +277,14 @@ static void trace_packet(struct sk_buff *skb,
{
void *table_base;
const struct ipt_entry *root;
- char *hookname, *chainname, *comment;
+ const char *hookname, *chainname, *comment;
unsigned int rulenum = 0;
- table_base = (void *)private->entries[smp_processor_id()];
+ table_base = private->entries[smp_processor_id()];
root = get_entry(table_base, private->hook_entry[hook]);
- hookname = chainname = (char *)hooknames[hook];
- comment = (char *)comments[NF_IP_TRACE_COMMENT_RULE];
+ hookname = chainname = hooknames[hook];
+ comment = comments[NF_IP_TRACE_COMMENT_RULE];
IPT_ENTRY_ITERATE(root,
private->size - private->hook_entry[hook],
@@ -297,6 +297,12 @@ static void trace_packet(struct sk_buff *skb,
}
#endif
+static inline __pure
+struct ipt_entry *ipt_next_entry(const struct ipt_entry *entry)
+{
+ return (void *)entry + entry->next_offset;
+}
+
/* Returns one of the generic firewall policies, like NF_ACCEPT. */
unsigned int
ipt_do_table(struct sk_buff *skb,
@@ -305,6 +311,8 @@ ipt_do_table(struct sk_buff *skb,
const struct net_device *out,
struct xt_table *table)
{
+#define tb_comefrom ((struct ipt_entry *)table_base)->comefrom
+
static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long))));
const struct iphdr *ip;
u_int16_t datalen;
@@ -335,7 +343,7 @@ ipt_do_table(struct sk_buff *skb,
mtpar.in = tgpar.in = in;
mtpar.out = tgpar.out = out;
mtpar.family = tgpar.family = NFPROTO_IPV4;
- tgpar.hooknum = hook;
+ mtpar.hooknum = tgpar.hooknum = hook;
IP_NF_ASSERT(table->valid_hooks & (1 << hook));
xt_info_rdlock_bh();
@@ -348,92 +356,84 @@ ipt_do_table(struct sk_buff *skb,
back = get_entry(table_base, private->underflow[hook]);
do {
+ struct ipt_entry_target *t;
+
IP_NF_ASSERT(e);
IP_NF_ASSERT(back);
- if (ip_packet_match(ip, indev, outdev,
- &e->ip, mtpar.fragoff)) {
- struct ipt_entry_target *t;
-
- if (IPT_MATCH_ITERATE(e, do_match, skb, &mtpar) != 0)
- goto no_match;
+ if (!ip_packet_match(ip, indev, outdev,
+ &e->ip, mtpar.fragoff) ||
+ IPT_MATCH_ITERATE(e, do_match, skb, &mtpar) != 0) {
+ e = ipt_next_entry(e);
+ continue;
+ }
- ADD_COUNTER(e->counters, ntohs(ip->tot_len), 1);
+ ADD_COUNTER(e->counters, ntohs(ip->tot_len), 1);
- t = ipt_get_target(e);
- IP_NF_ASSERT(t->u.kernel.target);
+ t = ipt_get_target(e);
+ IP_NF_ASSERT(t->u.kernel.target);
#if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \
defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE)
- /* The packet is traced: log it */
- if (unlikely(skb->nf_trace))
- trace_packet(skb, hook, in, out,
- table->name, private, e);
+ /* The packet is traced: log it */
+ if (unlikely(skb->nf_trace))
+ trace_packet(skb, hook, in, out,
+ table->name, private, e);
#endif
- /* Standard target? */
- if (!t->u.kernel.target->target) {
- int v;
-
- v = ((struct ipt_standard_target *)t)->verdict;
- if (v < 0) {
- /* Pop from stack? */
- if (v != IPT_RETURN) {
- verdict = (unsigned)(-v) - 1;
- break;
- }
- e = back;
- back = get_entry(table_base,
- back->comefrom);
- continue;
- }
- if (table_base + v != (void *)e + e->next_offset
- && !(e->ip.flags & IPT_F_GOTO)) {
- /* Save old back ptr in next entry */
- struct ipt_entry *next
- = (void *)e + e->next_offset;
- next->comefrom
- = (void *)back - table_base;
- /* set back pointer to next entry */
- back = next;
+ /* Standard target? */
+ if (!t->u.kernel.target->target) {
+ int v;
+
+ v = ((struct ipt_standard_target *)t)->verdict;
+ if (v < 0) {
+ /* Pop from stack? */
+ if (v != IPT_RETURN) {
+ verdict = (unsigned)(-v) - 1;
+ break;
}
+ e = back;
+ back = get_entry(table_base, back->comefrom);
+ continue;
+ }
+ if (table_base + v != ipt_next_entry(e)
+ && !(e->ip.flags & IPT_F_GOTO)) {
+ /* Save old back ptr in next entry */
+ struct ipt_entry *next = ipt_next_entry(e);
+ next->comefrom = (void *)back - table_base;
+ /* set back pointer to next entry */
+ back = next;
+ }
+
+ e = get_entry(table_base, v);
+ continue;
+ }
+
+ /* Targets which reenter must return
+ abs. verdicts */
+ tgpar.target = t->u.kernel.target;
+ tgpar.targinfo = t->data;
+
- e = get_entry(table_base, v);
- } else {
- /* Targets which reenter must return
- abs. verdicts */
- tgpar.target = t->u.kernel.target;
- tgpar.targinfo = t->data;
#ifdef CONFIG_NETFILTER_DEBUG
- ((struct ipt_entry *)table_base)->comefrom
- = 0xeeeeeeec;
+ tb_comefrom = 0xeeeeeeec;
#endif
- verdict = t->u.kernel.target->target(skb,
- &tgpar);
+ verdict = t->u.kernel.target->target(skb, &tgpar);
#ifdef CONFIG_NETFILTER_DEBUG
- if (((struct ipt_entry *)table_base)->comefrom
- != 0xeeeeeeec
- && verdict == IPT_CONTINUE) {
- printk("Target %s reentered!\n",
- t->u.kernel.target->name);
- verdict = NF_DROP;
- }
- ((struct ipt_entry *)table_base)->comefrom
- = 0x57acc001;
+ if (comefrom != 0xeeeeeeec && verdict == IPT_CONTINUE) {
+ printk("Target %s reentered!\n",
+ t->u.kernel.target->name);
+ verdict = NF_DROP;
+ }
+ tb_comefrom = 0x57acc001;
#endif
- /* Target might have changed stuff. */
- ip = ip_hdr(skb);
- datalen = skb->len - ip->ihl * 4;
-
- if (verdict == IPT_CONTINUE)
- e = (void *)e + e->next_offset;
- else
- /* Verdict */
- break;
- }
- } else {
+ /* Target might have changed stuff. */
+ ip = ip_hdr(skb);
+ datalen = skb->len - ip->ihl * 4;
- no_match:
- e = (void *)e + e->next_offset;
- }
+ if (verdict == IPT_CONTINUE)
+ e = ipt_next_entry(e);
+ else
+ /* Verdict */
+ break;
} while (!hotdrop);
xt_info_rdunlock_bh();
@@ -444,6 +444,8 @@ ipt_do_table(struct sk_buff *skb,
return NF_DROP;
else return verdict;
#endif
+
+#undef tb_comefrom
}
/* Figures out from what hook each rule can be called: returns 0 if
@@ -2158,7 +2160,7 @@ static bool icmp_checkentry(const struct xt_mtchk_param *par)
static struct xt_target ipt_standard_target __read_mostly = {
.name = IPT_STANDARD_TARGET,
.targetsize = sizeof(int),
- .family = AF_INET,
+ .family = NFPROTO_IPV4,
#ifdef CONFIG_COMPAT
.compatsize = sizeof(compat_int_t),
.compat_from_user = compat_standard_from_user,
@@ -2170,7 +2172,7 @@ static struct xt_target ipt_error_target __read_mostly = {
.name = IPT_ERROR_TARGET,
.target = ipt_error,
.targetsize = IPT_FUNCTION_MAXNAMELEN,
- .family = AF_INET,
+ .family = NFPROTO_IPV4,
};
static struct nf_sockopt_ops ipt_sockopts = {
@@ -2196,17 +2198,17 @@ static struct xt_match icmp_matchstruct __read_mostly = {
.matchsize = sizeof(struct ipt_icmp),
.checkentry = icmp_checkentry,
.proto = IPPROTO_ICMP,
- .family = AF_INET,
+ .family = NFPROTO_IPV4,
};
static int __net_init ip_tables_net_init(struct net *net)
{
- return xt_proto_init(net, AF_INET);
+ return xt_proto_init(net, NFPROTO_IPV4);
}
static void __net_exit ip_tables_net_exit(struct net *net)
{
- xt_proto_fini(net, AF_INET);
+ xt_proto_fini(net, NFPROTO_IPV4);
}
static struct pernet_operations ip_tables_net_ops = {
diff --git a/net/ipv4/netfilter/ipt_MASQUERADE.c b/net/ipv4/netfilter/ipt_MASQUERADE.c
index c0992c75bda..dada0863946 100644
--- a/net/ipv4/netfilter/ipt_MASQUERADE.c
+++ b/net/ipv4/netfilter/ipt_MASQUERADE.c
@@ -27,9 +27,6 @@ MODULE_LICENSE("GPL");
MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
MODULE_DESCRIPTION("Xtables: automatic-address SNAT");
-/* Lock protects masq region inside conntrack */
-static DEFINE_RWLOCK(masq_lock);
-
/* FIXME: Multiple targets. --RR */
static bool masquerade_tg_check(const struct xt_tgchk_param *par)
{
@@ -79,9 +76,7 @@ masquerade_tg(struct sk_buff *skb, const struct xt_target_param *par)
return NF_DROP;
}
- write_lock_bh(&masq_lock);
nat->masq_index = par->out->ifindex;
- write_unlock_bh(&masq_lock);
/* Transfer from original range. */
newrange = ((struct nf_nat_range)
@@ -97,16 +92,11 @@ static int
device_cmp(struct nf_conn *i, void *ifindex)
{
const struct nf_conn_nat *nat = nfct_nat(i);
- int ret;
if (!nat)
return 0;
- read_lock_bh(&masq_lock);
- ret = (nat->masq_index == (int)(long)ifindex);
- read_unlock_bh(&masq_lock);
-
- return ret;
+ return nat->masq_index == (int)(long)ifindex;
}
static int masq_device_event(struct notifier_block *this,
diff --git a/net/ipv4/netfilter/nf_conntrack_proto_icmp.c b/net/ipv4/netfilter/nf_conntrack_proto_icmp.c
index 23b2c2ee869..d71ba767734 100644
--- a/net/ipv4/netfilter/nf_conntrack_proto_icmp.c
+++ b/net/ipv4/netfilter/nf_conntrack_proto_icmp.c
@@ -82,18 +82,10 @@ static int icmp_packet(struct nf_conn *ct,
u_int8_t pf,
unsigned int hooknum)
{
- /* Try to delete connection immediately after all replies:
- won't actually vanish as we still have skb, and del_timer
- means this will only run once even if count hits zero twice
- (theoretically possible with SMP) */
- if (CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY) {
- if (atomic_dec_and_test(&ct->proto.icmp.count))
- nf_ct_kill_acct(ct, ctinfo, skb);
- } else {
- atomic_inc(&ct->proto.icmp.count);
- nf_conntrack_event_cache(IPCT_PROTOINFO_VOLATILE, ct);
- nf_ct_refresh_acct(ct, ctinfo, skb, nf_ct_icmp_timeout);
- }
+ /* Do not immediately delete the connection after the first
+ successful reply to avoid excessive conntrackd traffic
+ and also to handle correctly ICMP echo reply duplicates. */
+ nf_ct_refresh_acct(ct, ctinfo, skb, nf_ct_icmp_timeout);
return NF_ACCEPT;
}
@@ -117,7 +109,6 @@ static bool icmp_new(struct nf_conn *ct, const struct sk_buff *skb,
nf_ct_dump_tuple_ip(&ct->tuplehash[0].tuple);
return false;
}
- atomic_set(&ct->proto.icmp.count, 0);
return true;
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-23 12:26:08 +0000