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Use unified method for accessing / updating cached rule pointers.

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MFC after:	2 weeks
This commit is contained in:
Alexander V. Chernikov 2013-05-04 18:24:30 +00:00
parent 424b842a5d
commit 454189c130
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=250246
1 changed files with 35 additions and 40 deletions
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75
sys/netpfil/ipfw/ip_fw2.c
View file

@ -779,6 +779,38 @@ set_match(struct ip_fw_args *args, int slot,
args->rule.rulenum = chain->map[slot]->rulenum;
}
/*
* Helper function to enable cached rule lookups using
* x_next and next_rule fields in ipfw rule.
*/
static int
jump_fast(struct ip_fw_chain *chain, struct ip_fw *f, int num,
int tablearg, int jump_backwards)
{
int f_pos;
/* If possible use cached f_pos (in f->next_rule),
* whose version is written in f->next_rule
* (horrible hacks to avoid changing the ABI).
*/
if (num != IP_FW_TABLEARG && (uintptr_t)f->x_next == chain->id)
f_pos = (uintptr_t)f->next_rule;
else {
int i = IP_FW_ARG_TABLEARG(num);
/* make sure we do not jump backward */
if (jump_backwards == 0 && i <= f->rulenum)
i = f->rulenum + 1;
f_pos = ipfw_find_rule(chain, i, 0);
/* update the cache */
if (num != IP_FW_TABLEARG) {
f->next_rule = (void *)(uintptr_t)f_pos;
f->x_next = (void *)(uintptr_t)chain->id;
}
}
return (f_pos);
}
/*
* The main check routine for the firewall.
*
@ -2123,27 +2155,7 @@ do { \
case O_SKIPTO:
IPFW_INC_RULE_COUNTER(f, pktlen);
/* If possible use cached f_pos (in f->next_rule),
* whose version is written in f->next_rule
* (horrible hacks to avoid changing the ABI).
*/
if (cmd->arg1 != IP_FW_TABLEARG &&
(uintptr_t)f->x_next == chain->id) {
f_pos = (uintptr_t)f->next_rule;
} else {
int i = IP_FW_ARG_TABLEARG(cmd->arg1);
/* make sure we do not jump backward */
if (i <= f->rulenum)
i = f->rulenum + 1;
f_pos = ipfw_find_rule(chain, i, 0);
/* update the cache */
if (cmd->arg1 != IP_FW_TABLEARG) {
f->next_rule =
(void *)(uintptr_t)f_pos;
f->x_next =
(void *)(uintptr_t)chain->id;
}
}
f_pos = jump_fast(chain, f, cmd->arg1, tablearg, 0);
/*
* Skip disabled rules, and re-enter
* the inner loop with the correct
@ -2232,25 +2244,8 @@ do { \
if (IS_CALL) {
stack[mtag->m_tag_id] = f->rulenum;
mtag->m_tag_id++;
if (cmd->arg1 != IP_FW_TABLEARG &&
(uintptr_t)f->x_next == chain->id) {
f_pos = (uintptr_t)f->next_rule;
} else {
jmpto = IP_FW_ARG_TABLEARG(
cmd->arg1);
f_pos = ipfw_find_rule(chain,
jmpto, 0);
/* update the cache */
if (cmd->arg1 !=
IP_FW_TABLEARG) {
f->next_rule =
(void *)(uintptr_t)
f_pos;
f->x_next =
(void *)(uintptr_t)
chain->id;
}
}
f_pos = jump_fast(chain, f, cmd->arg1,
tablearg, 1);
} else { /* `return' action */
mtag->m_tag_id--;
jmpto = stack[mtag->m_tag_id] + 1;