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netfilter: xtables: change hotdrop pointer to direct modification

Browse source 
Since xt_action_param is writable, let's use it. The pointer to
'bool hotdrop' always worried (8 bytes (64-bit) to write 1 byte!).
Surprisingly results in a reduction in size:

   text    data     bss filename
5457066  692730  357892 vmlinux.o-prev
5456554  692730  357892 vmlinux.o

Signed-off-by: Jan Engelhardt <[email protected]>
This commit is contained in:
Jan Engelhardt 2009-07-07 20:54:30 +02:00
commit b4ba26119b
22 changed files with 47 additions and 47 deletions
Download patch file Download diff file Expand all files Collapse all files

6
net/ipv4/netfilter/arp_tables.c
View file

@ -260,7 +260,6 @@ unsigned int arpt_do_table(struct sk_buff *skb,
static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long))));
unsigned int verdict = NF_DROP;
const struct arphdr *arp;
bool hotdrop = false;
struct arpt_entry *e, *back;
const char *indev, *outdev;
void *table_base;
@ -284,6 +283,7 @@ unsigned int arpt_do_table(struct sk_buff *skb,
acpar.out = out;
acpar.hooknum = hook;
acpar.family = NFPROTO_ARP;
acpar.hotdrop = false;
arp = arp_hdr(skb);
do {
@ -345,10 +345,10 @@ unsigned int arpt_do_table(struct sk_buff *skb,
else
/* Verdict */
break;
} while (!hotdrop);
} while (!acpar.hotdrop);
xt_info_rdunlock_bh();
if (hotdrop)
if (acpar.hotdrop)
return NF_DROP;
else
return verdict;

9
net/ipv4/netfilter/ip_tables.c
View file

@ -308,7 +308,6 @@ ipt_do_table(struct sk_buff *skb,
{
static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long))));
const struct iphdr *ip;
bool hotdrop = false;
/* Initializing verdict to NF_DROP keeps gcc happy. */
unsigned int verdict = NF_DROP;
const char *indev, *outdev;
@ -330,7 +329,7 @@ ipt_do_table(struct sk_buff *skb,
* match it. */
acpar.fragoff = ntohs(ip->frag_off) & IP_OFFSET;
acpar.thoff = ip_hdrlen(skb);
acpar.hotdrop = &hotdrop;
acpar.hotdrop = false;
acpar.in = in;
acpar.out = out;
acpar.family = NFPROTO_IPV4;
@ -432,7 +431,7 @@ ipt_do_table(struct sk_buff *skb,
else
/* Verdict */
break;
} while (!hotdrop);
} while (!acpar.hotdrop);
xt_info_rdunlock_bh();
pr_debug("Exiting %s; resetting sp from %u to %u\n",
__func__, *stackptr, origptr);
@ -440,7 +439,7 @@ ipt_do_table(struct sk_buff *skb,
#ifdef DEBUG_ALLOW_ALL
return NF_ACCEPT;
#else
if (hotdrop)
if (acpar.hotdrop)
return NF_DROP;
else return verdict;
#endif
@ -2154,7 +2153,7 @@ icmp_match(const struct sk_buff *skb, struct xt_action_param *par)
* can't. Hence, no choice but to drop.
*/
duprintf("Dropping evil ICMP tinygram.\n");
*par->hotdrop = true;
par->hotdrop = true;
return false;
}

2
net/ipv4/netfilter/ipt_ah.c
View file

@ -46,7 +46,7 @@ static bool ah_mt(const struct sk_buff *skb, struct xt_action_param *par)
* can't. Hence, no choice but to drop.
*/
pr_debug("Dropping evil AH tinygram.\n");
*par->hotdrop = true;
par->hotdrop = true;
return 0;
}

2
net/ipv4/netfilter/ipt_ecn.c
View file

@ -78,7 +78,7 @@ static bool ecn_mt(const struct sk_buff *skb, struct xt_action_param *par)
if (info->operation & (IPT_ECN_OP_MATCH_ECE|IPT_ECN_OP_MATCH_CWR)) {
if (ip_hdr(skb)->protocol != IPPROTO_TCP)
return false;
if (!match_tcp(skb, info, par->hotdrop))
if (!match_tcp(skb, info, &par->hotdrop))
return false;
}