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Improve "reserved keywords" hack:

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we can't easily predict (in current parsing model)
if the keyword is ipfw(8) reserved keyword or port name.
Checking proto database via getprotobyname() consumes a lot of
CPU and leads to tens of seconds for parsing large ruleset.
Use list of reserved keywords and check them as pre-requisite
before doing getprotobyname().

Obtained from:	Yandex LLC
This commit is contained in:
Alexander V. Chernikov 2014-10-06 11:00:47 +00:00
parent 88971a900d
commit 9bb47e7068
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=272607
1 changed files with 25 additions and 4 deletions
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29
sbin/ipfw/ipfw2.c
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@ -2904,13 +2904,34 @@ add_dstip(ipfw_insn *cmd, char *av, int cblen, struct tidx *tstate)
return cmd;
}
static struct _s_x f_reserved_keywords[] = {
{ "altq", TOK_OR },
{ "//", TOK_OR },
{ "diverted", TOK_OR },
{ "dst-port", TOK_OR },
{ "src-port", TOK_OR },
{ "established", TOK_OR },
{ "keep-state", TOK_OR },
{ "frag", TOK_OR },
{ "icmptypes", TOK_OR },
{ "in", TOK_OR },
{ "out", TOK_OR },
{ "ip6", TOK_OR },
{ "any", TOK_OR },
{ "to", TOK_OR },
{ "via", TOK_OR },
{ "{", TOK_OR },
{ NULL, 0 } /* terminator */
};
static ipfw_insn *
add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode, int cblen)
{
/* XXX "any" is trapped before. Perhaps "to" */
if (_substrcmp(av, "any") == 0) {
return NULL;
} else if (fill_newports((ipfw_insn_u16 *)cmd, av, proto, cblen)) {
if (match_token(f_reserved_keywords, av) != -1)
return (NULL);
if (fill_newports((ipfw_insn_u16 *)cmd, av, proto, cblen)) {
/* XXX todo: check that we have a protocol with ports */
cmd->opcode = opcode;
return cmd;