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Commit dcea992a authored by Jan Engelhardt's avatar Jan Engelhardt Committed by Patrick McHardy
Browse files

netfilter: xtables: replace XT_MATCH_ITERATE macro 



The macro is replaced by a list.h-like foreach loop. This makes
the code more inspectable.

Signed-off-by: default avatarJan Engelhardt <jengelh@medozas.de>
Signed-off-by: default avatarPatrick McHardy <kaber@trash.net>
parent 0559518b

include/linux/netfilter/x_tables.h

+9 −1
Original line number Diff line number Diff line
@@ -120,6 +120,7 @@ struct xt_counters_info { 


#define XT_INV_PROTO		0x40	/* Invert the sense of PROTO. */



#ifndef __KERNEL__

/* fn returns 0 to continue iteration */

#define XT_MATCH_ITERATE(type, e, fn, args...)			\

({								\
@@ -139,7 +140,6 @@ struct xt_counters_info { 
	__ret;							\

})



#ifndef __KERNEL__

/* fn returns 0 to continue iteration */

#define XT_ENTRY_ITERATE_CONTINUE(type, entries, size, n, fn, args...) \

({								\
@@ -172,6 +172,14 @@ struct xt_counters_info { 
	     (pos) < (typeof(pos))((char *)(ehead) + (esize)); \

	     (pos) = (typeof(pos))((char *)(pos) + (pos)->next_offset))



/* can only be xt_entry_match, so no use of typeof here */

#define xt_ematch_foreach(pos, entry) \

	for ((pos) = (struct xt_entry_match *)entry->elems; \

	     (pos) < (struct xt_entry_match *)((char *)(entry) + \

	             (entry)->target_offset); \

	     (pos) = (struct xt_entry_match *)((char *)(pos) + \

	             (pos)->u.match_size))



#ifdef __KERNEL__



#include <linux/netdevice.h>

include/linux/netfilter_ipv4/ip_tables.h

+1 −5
Original line number Diff line number Diff line
@@ -223,11 +223,11 @@ ipt_get_target(struct ipt_entry *e) 
	return (void *)e + e->target_offset;

}



#ifndef __KERNEL__

/* fn returns 0 to continue iteration */

#define IPT_MATCH_ITERATE(e, fn, args...) \

	XT_MATCH_ITERATE(struct ipt_entry, e, fn, ## args)



#ifndef __KERNEL__

/* fn returns 0 to continue iteration */

#define IPT_ENTRY_ITERATE(entries, size, fn, args...) \

	XT_ENTRY_ITERATE(struct ipt_entry, entries, size, fn, ## args)
@@ -315,10 +315,6 @@ compat_ipt_get_target(struct compat_ipt_entry *e) 


#define COMPAT_IPT_ALIGN(s) 	COMPAT_XT_ALIGN(s)



/* fn returns 0 to continue iteration */

#define COMPAT_IPT_MATCH_ITERATE(e, fn, args...) \

	XT_MATCH_ITERATE(struct compat_ipt_entry, e, fn, ## args)



#endif /* CONFIG_COMPAT */

#endif /*__KERNEL__*/

#endif /* _IPTABLES_H */

include/linux/netfilter_ipv6/ip6_tables.h

+1 −5
Original line number Diff line number Diff line
@@ -280,11 +280,11 @@ ip6t_get_target(struct ip6t_entry *e) 
	return (void *)e + e->target_offset;

}



#ifndef __KERNEL__

/* fn returns 0 to continue iteration */

#define IP6T_MATCH_ITERATE(e, fn, args...) \

	XT_MATCH_ITERATE(struct ip6t_entry, e, fn, ## args)



#ifndef __KERNEL__

/* fn returns 0 to continue iteration */

#define IP6T_ENTRY_ITERATE(entries, size, fn, args...) \

	XT_ENTRY_ITERATE(struct ip6t_entry, entries, size, fn, ## args)
@@ -343,10 +343,6 @@ compat_ip6t_get_target(struct compat_ip6t_entry *e) 


#define COMPAT_IP6T_ALIGN(s)	COMPAT_XT_ALIGN(s)



/* fn returns 0 to continue iteration */

#define COMPAT_IP6T_MATCH_ITERATE(e, fn, args...) \

	XT_MATCH_ITERATE(struct compat_ip6t_entry, e, fn, ## args)



#endif /* CONFIG_COMPAT */

#endif /*__KERNEL__*/

#endif /* _IP6_TABLES_H */

net/ipv4/netfilter/ip_tables.c

+61 −17
Original line number Diff line number Diff line
@@ -366,16 +366,21 @@ ipt_do_table(struct sk_buff *skb, 


	do {

		const struct ipt_entry_target *t;

		const struct xt_entry_match *ematch;



		IP_NF_ASSERT(e);

		IP_NF_ASSERT(back);

		if (!ip_packet_match(ip, indev, outdev,

		    &e->ip, mtpar.fragoff) ||

		    IPT_MATCH_ITERATE(e, do_match, skb, &mtpar) != 0) {

		    &e->ip, mtpar.fragoff)) {

 no_match:

			e = ipt_next_entry(e);

			continue;

		}



		xt_ematch_foreach(ematch, e)

			if (do_match(ematch, skb, &mtpar) != 0)

				goto no_match;



		ADD_COUNTER(e->counters, ntohs(ip->tot_len), 1);



		t = ipt_get_target(e);
@@ -686,6 +691,7 @@ find_check_entry(struct ipt_entry *e, struct net *net, const char *name, 
	int ret;

	unsigned int j;

	struct xt_mtchk_param mtpar;

	struct xt_entry_match *ematch;



	ret = check_entry(e, name);

	if (ret)
@@ -697,7 +703,11 @@ find_check_entry(struct ipt_entry *e, struct net *net, const char *name, 
	mtpar.entryinfo = &e->ip;

	mtpar.hook_mask = e->comefrom;

	mtpar.family    = NFPROTO_IPV4;

	ret = IPT_MATCH_ITERATE(e, find_check_match, &mtpar, &j);

	xt_ematch_foreach(ematch, e) {

		ret = find_check_match(ematch, &mtpar, &j);

		if (ret != 0)

			break;

	}

	if (ret != 0)

		goto cleanup_matches;
@@ -720,7 +730,9 @@ find_check_entry(struct ipt_entry *e, struct net *net, const char *name, 
 err:

	module_put(t->u.kernel.target->me);

 cleanup_matches:

	IPT_MATCH_ITERATE(e, cleanup_match, net, &j);

	xt_ematch_foreach(ematch, e)

		if (cleanup_match(ematch, net, &j) != 0)

			break;

	return ret;

}
@@ -791,9 +803,12 @@ cleanup_entry(struct ipt_entry *e, struct net *net) 
{

	struct xt_tgdtor_param par;

	struct ipt_entry_target *t;

	struct xt_entry_match *ematch;



	/* Cleanup all matches */

	IPT_MATCH_ITERATE(e, cleanup_match, net, NULL);

	xt_ematch_foreach(ematch, e)

		if (cleanup_match(ematch, net, NULL) != 0)

			break;

	t = ipt_get_target(e);



	par.net      = net;
@@ -1060,13 +1075,16 @@ static int compat_calc_entry(const struct ipt_entry *e, 
			     const struct xt_table_info *info,

			     const void *base, struct xt_table_info *newinfo)

{

	const struct xt_entry_match *ematch;

	const struct ipt_entry_target *t;

	unsigned int entry_offset;

	int off, i, ret;



	off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry);

	entry_offset = (void *)e - base;

	IPT_MATCH_ITERATE(e, compat_calc_match, &off);

	xt_ematch_foreach(ematch, e)

		if (compat_calc_match(ematch, &off) != 0)

			break;

	t = ipt_get_target_c(e);

	off += xt_compat_target_offset(t->u.kernel.target);

	newinfo->size -= off;
@@ -1441,7 +1459,8 @@ compat_copy_entry_to_user(struct ipt_entry *e, void __user **dstptr, 
	struct compat_ipt_entry __user *ce;

	u_int16_t target_offset, next_offset;

	compat_uint_t origsize;

	int ret;

	const struct xt_entry_match *ematch;

	int ret = 0;



	origsize = *size;

	ce = (struct compat_ipt_entry __user *)*dstptr;
@@ -1453,7 +1472,11 @@ compat_copy_entry_to_user(struct ipt_entry *e, void __user **dstptr, 
	*dstptr += sizeof(struct compat_ipt_entry);

	*size -= sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry);



	ret = IPT_MATCH_ITERATE(e, xt_compat_match_to_user, dstptr, size);

	xt_ematch_foreach(ematch, e) {

		ret = xt_compat_match_to_user(ematch, dstptr, size);

		if (ret != 0)

			break;

	}

	target_offset = e->target_offset - (origsize - *size);

	if (ret)

		return ret;
@@ -1505,9 +1528,12 @@ compat_release_match(struct ipt_entry_match *m, unsigned int *i) 
static void compat_release_entry(struct compat_ipt_entry *e)

{

	struct ipt_entry_target *t;

	struct xt_entry_match *ematch;



	/* Cleanup all matches */

	COMPAT_IPT_MATCH_ITERATE(e, compat_release_match, NULL);

	xt_ematch_foreach(ematch, e)

		if (compat_release_match(ematch, NULL) != 0)

			break;

	t = compat_ipt_get_target(e);

	module_put(t->u.kernel.target->me);

}
@@ -1522,6 +1548,7 @@ check_compat_entry_size_and_hooks(struct compat_ipt_entry *e, 
				  const unsigned int *underflows,

				  const char *name)

{

	struct xt_entry_match *ematch;

	struct ipt_entry_target *t;

	struct xt_target *target;

	unsigned int entry_offset;
@@ -1550,8 +1577,12 @@ check_compat_entry_size_and_hooks(struct compat_ipt_entry *e, 
	off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry);

	entry_offset = (void *)e - (void *)base;

	j = 0;

	ret = COMPAT_IPT_MATCH_ITERATE(e, compat_find_calc_match, name,

	xt_ematch_foreach(ematch, e) {

		ret = compat_find_calc_match(ematch, name,

		      &e->ip, e->comefrom, &off, &j);

		if (ret != 0)

			break;

	}

	if (ret != 0)

		goto release_matches;
@@ -1590,7 +1621,9 @@ check_compat_entry_size_and_hooks(struct compat_ipt_entry *e, 
out:

	module_put(t->u.kernel.target->me);

release_matches:

	IPT_MATCH_ITERATE(e, compat_release_match, &j);

	xt_ematch_foreach(ematch, e)

		if (compat_release_match(ematch, &j) != 0)

			break;

	return ret;

}
@@ -1604,6 +1637,7 @@ compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr, 
	struct ipt_entry *de;

	unsigned int origsize;

	int ret, h;

	struct xt_entry_match *ematch;



	ret = 0;

	origsize = *size;
@@ -1614,8 +1648,11 @@ compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr, 
	*dstptr += sizeof(struct ipt_entry);

	*size += sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry);



	ret = COMPAT_IPT_MATCH_ITERATE(e, xt_compat_match_from_user,

				       dstptr, size);

	xt_ematch_foreach(ematch, e) {

		ret = xt_compat_match_from_user(ematch, dstptr, size);

		if (ret != 0)

			break;

	}

	if (ret)

		return ret;

	de->target_offset = e->target_offset - (origsize - *size);
@@ -1636,9 +1673,10 @@ compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr, 
static int

compat_check_entry(struct ipt_entry *e, struct net *net, const char *name)

{

	struct xt_entry_match *ematch;

	struct xt_mtchk_param mtpar;

	unsigned int j;

	int ret;

	int ret = 0;



	j = 0;

	mtpar.net	= net;
@@ -1646,7 +1684,11 @@ compat_check_entry(struct ipt_entry *e, struct net *net, const char *name) 
	mtpar.entryinfo = &e->ip;

	mtpar.hook_mask = e->comefrom;

	mtpar.family    = NFPROTO_IPV4;

	ret = IPT_MATCH_ITERATE(e, check_match, &mtpar, &j);

	xt_ematch_foreach(ematch, e) {

		ret = check_match(ematch, &mtpar, &j);

		if (ret != 0)

			break;

	}

	if (ret)

		goto cleanup_matches;
@@ -1656,7 +1698,9 @@ compat_check_entry(struct ipt_entry *e, struct net *net, const char *name) 
	return 0;



 cleanup_matches:

	IPT_MATCH_ITERATE(e, cleanup_match, net, &j);

	xt_ematch_foreach(ematch, e)

		if (cleanup_match(ematch, net, &j) != 0)

			break;

	return ret;

}

net/ipv6/netfilter/ip6_tables.c

+61 −17
Original line number Diff line number Diff line
@@ -393,16 +393,21 @@ ip6t_do_table(struct sk_buff *skb, 


	do {

		const struct ip6t_entry_target *t;

		const struct xt_entry_match *ematch;



		IP_NF_ASSERT(e);

		IP_NF_ASSERT(back);

		if (!ip6_packet_match(skb, indev, outdev, &e->ipv6,

		    &mtpar.thoff, &mtpar.fragoff, &hotdrop) ||

		    IP6T_MATCH_ITERATE(e, do_match, skb, &mtpar) != 0) {

		    &mtpar.thoff, &mtpar.fragoff, &hotdrop)) {

 no_match:

			e = ip6t_next_entry(e);

			continue;

		}



		xt_ematch_foreach(ematch, e)

			if (do_match(ematch, skb, &mtpar) != 0)

				goto no_match;



		ADD_COUNTER(e->counters,

			    ntohs(ipv6_hdr(skb)->payload_len) +

			    sizeof(struct ipv6hdr), 1);
@@ -717,6 +722,7 @@ find_check_entry(struct ip6t_entry *e, struct net *net, const char *name, 
	int ret;

	unsigned int j;

	struct xt_mtchk_param mtpar;

	struct xt_entry_match *ematch;



	ret = check_entry(e, name);

	if (ret)
@@ -728,7 +734,11 @@ find_check_entry(struct ip6t_entry *e, struct net *net, const char *name, 
	mtpar.entryinfo = &e->ipv6;

	mtpar.hook_mask = e->comefrom;

	mtpar.family    = NFPROTO_IPV6;

	ret = IP6T_MATCH_ITERATE(e, find_check_match, &mtpar, &j);

	xt_ematch_foreach(ematch, e) {

		ret = find_check_match(ematch, &mtpar, &j);

		if (ret != 0)

			break;

	}

	if (ret != 0)

		goto cleanup_matches;
@@ -751,7 +761,9 @@ find_check_entry(struct ip6t_entry *e, struct net *net, const char *name, 
 err:

	module_put(t->u.kernel.target->me);

 cleanup_matches:

	IP6T_MATCH_ITERATE(e, cleanup_match, net, &j);

	xt_ematch_foreach(ematch, e)

		if (cleanup_match(ematch, net, &j) != 0)

			break;

	return ret;

}
@@ -821,9 +833,12 @@ static void cleanup_entry(struct ip6t_entry *e, struct net *net) 
{

	struct xt_tgdtor_param par;

	struct ip6t_entry_target *t;

	struct xt_entry_match *ematch;



	/* Cleanup all matches */

	IP6T_MATCH_ITERATE(e, cleanup_match, net, NULL);

	xt_ematch_foreach(ematch, e)

		if (cleanup_match(ematch, net, NULL) != 0)

			break;

	t = ip6t_get_target(e);



	par.net      = net;
@@ -1090,13 +1105,16 @@ static int compat_calc_entry(const struct ip6t_entry *e, 
			     const struct xt_table_info *info,

			     const void *base, struct xt_table_info *newinfo)

{

	const struct xt_entry_match *ematch;

	const struct ip6t_entry_target *t;

	unsigned int entry_offset;

	int off, i, ret;



	off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);

	entry_offset = (void *)e - base;

	IP6T_MATCH_ITERATE(e, compat_calc_match, &off);

	xt_ematch_foreach(ematch, e)

		if (compat_calc_match(ematch, &off) != 0)

			break;

	t = ip6t_get_target_c(e);

	off += xt_compat_target_offset(t->u.kernel.target);

	newinfo->size -= off;
@@ -1474,7 +1492,8 @@ compat_copy_entry_to_user(struct ip6t_entry *e, void __user **dstptr, 
	struct compat_ip6t_entry __user *ce;

	u_int16_t target_offset, next_offset;

	compat_uint_t origsize;

	int ret;

	const struct xt_entry_match *ematch;

	int ret = 0;



	origsize = *size;

	ce = (struct compat_ip6t_entry __user *)*dstptr;
@@ -1486,7 +1505,11 @@ compat_copy_entry_to_user(struct ip6t_entry *e, void __user **dstptr, 
	*dstptr += sizeof(struct compat_ip6t_entry);

	*size -= sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);



	ret = IP6T_MATCH_ITERATE(e, xt_compat_match_to_user, dstptr, size);

	xt_ematch_foreach(ematch, e) {

		ret = xt_compat_match_to_user(ematch, dstptr, size);

		if (ret != 0)

			break;

	}

	target_offset = e->target_offset - (origsize - *size);

	if (ret)

		return ret;
@@ -1538,9 +1561,12 @@ compat_release_match(struct ip6t_entry_match *m, unsigned int *i) 
static void compat_release_entry(struct compat_ip6t_entry *e)

{

	struct ip6t_entry_target *t;

	struct xt_entry_match *ematch;



	/* Cleanup all matches */

	COMPAT_IP6T_MATCH_ITERATE(e, compat_release_match, NULL);

	xt_ematch_foreach(ematch, e)

		if (compat_release_match(ematch, NULL) != 0)

			break;

	t = compat_ip6t_get_target(e);

	module_put(t->u.kernel.target->me);

}
@@ -1555,6 +1581,7 @@ check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e, 
				  const unsigned int *underflows,

				  const char *name)

{

	struct xt_entry_match *ematch;

	struct ip6t_entry_target *t;

	struct xt_target *target;

	unsigned int entry_offset;
@@ -1583,8 +1610,12 @@ check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e, 
	off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);

	entry_offset = (void *)e - (void *)base;

	j = 0;

	ret = COMPAT_IP6T_MATCH_ITERATE(e, compat_find_calc_match, name,

	xt_ematch_foreach(ematch, e) {

		ret = compat_find_calc_match(ematch, name,

		      &e->ipv6, e->comefrom, &off, &j);

		if (ret != 0)

			break;

	}

	if (ret != 0)

		goto release_matches;
@@ -1623,7 +1654,9 @@ check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e, 
out:

	module_put(t->u.kernel.target->me);

release_matches:

	IP6T_MATCH_ITERATE(e, compat_release_match, &j);

	xt_ematch_foreach(ematch, e)

		if (compat_release_match(ematch, &j) != 0)

			break;

	return ret;

}
@@ -1637,6 +1670,7 @@ compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr, 
	struct ip6t_entry *de;

	unsigned int origsize;

	int ret, h;

	struct xt_entry_match *ematch;



	ret = 0;

	origsize = *size;
@@ -1647,8 +1681,11 @@ compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr, 
	*dstptr += sizeof(struct ip6t_entry);

	*size += sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);



	ret = COMPAT_IP6T_MATCH_ITERATE(e, xt_compat_match_from_user,

					dstptr, size);

	xt_ematch_foreach(ematch, e) {

		ret = xt_compat_match_from_user(ematch, dstptr, size);

		if (ret != 0)

			break;

	}

	if (ret)

		return ret;

	de->target_offset = e->target_offset - (origsize - *size);
@@ -1670,8 +1707,9 @@ static int compat_check_entry(struct ip6t_entry *e, struct net *net, 
			      const char *name)

{

	unsigned int j;

	int ret;

	int ret = 0;

	struct xt_mtchk_param mtpar;

	struct xt_entry_match *ematch;



	j = 0;

	mtpar.net	= net;
@@ -1679,7 +1717,11 @@ static int compat_check_entry(struct ip6t_entry *e, struct net *net, 
	mtpar.entryinfo = &e->ipv6;

	mtpar.hook_mask = e->comefrom;

	mtpar.family    = NFPROTO_IPV6;

	ret = IP6T_MATCH_ITERATE(e, check_match, &mtpar, &j);

	xt_ematch_foreach(ematch, e) {

		ret = check_match(ematch, &mtpar, &j);

		if (ret != 0)

			break;

	}

	if (ret)

		goto cleanup_matches;
@@ -1689,7 +1731,9 @@ static int compat_check_entry(struct ip6t_entry *e, struct net *net, 
	return 0;



 cleanup_matches:

	IP6T_MATCH_ITERATE(e, cleanup_match, net, &j);

	xt_ematch_foreach(ematch, e)

		if (cleanup_match(ematch, net, &j) != 0)

			break;

	return ret;

}