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--- sbin/ipfw/ipfw2.c.orig
+++ sbin/ipfw/ipfw2.c
@@ -4662,12 +4662,27 @@
case TOK_JAIL:
NEED1("jail requires argument");
{
+ char *end;
int jid;
cmd->opcode = O_JAIL;
- jid = jail_getid(*av);
- if (jid < 0)
- errx(EX_DATAERR, "%s", jail_errmsg);
+ /*
+ * If av is a number, then we'll just pass it as-is. If
+ * it's a name, try to resolve that to a jid.
+ *
+ * We save the jail_getid(3) call for a fallback because
+ * it entails an unconditional trip to the kernel to
+ * either validate a jid or resolve a name to a jid.
+ * This specific token doesn't currently require a
+ * jid to be an active jail, so we save a transition
+ * by simply using a number that we're given.
+ */
+ jid = strtoul(*av, &end, 10);
+ if (*end != '\0') {
+ jid = jail_getid(*av);
+ if (jid < 0)
+ errx(EX_DATAERR, "%s", jail_errmsg);
+ }
cmd32->d[0] = (uint32_t)jid;
cmd->len |= F_INSN_SIZE(ipfw_insn_u32);
av++;
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