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84 lines
2.5 KiB
Diff
84 lines
2.5 KiB
Diff
--- a/net/ipv4/netfilter/ip_tables.c
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+++ b/net/ipv4/netfilter/ip_tables.c
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@@ -310,6 +310,33 @@ struct ipt_entry *ipt_next_entry(const s
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return (void *)entry + entry->next_offset;
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}
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+static bool
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+ipt_handle_default_rule(struct ipt_entry *e, unsigned int *verdict)
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+{
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+ struct xt_entry_target *t;
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+ struct xt_standard_target *st;
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+
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+ if (e->target_offset != sizeof(struct ipt_entry))
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+ return false;
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+
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+ if (!(e->ip.flags & IPT_F_NO_DEF_MATCH))
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+ return false;
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+
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+ t = ipt_get_target(e);
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+ if (t->u.kernel.target->target)
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+ return false;
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+
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+ st = (struct xt_standard_target *) t;
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+ if (st->verdict == XT_RETURN)
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+ return false;
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+
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+ if (st->verdict >= 0)
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+ return false;
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+
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+ *verdict = (unsigned)(-st->verdict) - 1;
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+ return true;
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+}
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+
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/* Returns one of the generic firewall policies, like NF_ACCEPT. */
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unsigned int
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ipt_do_table(struct sk_buff *skb,
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@@ -334,19 +361,6 @@ ipt_do_table(struct sk_buff *skb,
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ip = ip_hdr(skb);
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indev = in ? in->name : nulldevname;
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outdev = out ? out->name : nulldevname;
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- /* We handle fragments by dealing with the first fragment as
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- * if it was a normal packet. All other fragments are treated
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- * normally, except that they will NEVER match rules that ask
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- * things we don't know, ie. tcp syn flag or ports). If the
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- * rule is also a fragment-specific rule, non-fragments won't
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- * match it. */
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- acpar.fragoff = ntohs(ip->frag_off) & IP_OFFSET;
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- acpar.thoff = ip_hdrlen(skb);
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- acpar.hotdrop = false;
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- acpar.in = in;
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- acpar.out = out;
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- acpar.family = NFPROTO_IPV4;
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- acpar.hooknum = hook;
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IP_NF_ASSERT(table->valid_hooks & (1 << hook));
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local_bh_disable();
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@@ -364,6 +378,26 @@ ipt_do_table(struct sk_buff *skb,
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origptr = *stackptr;
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e = get_entry(table_base, private->hook_entry[hook]);
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+ if (ipt_handle_default_rule(e, &verdict)) {
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+ ADD_COUNTER(e->counters, skb->len, 1);
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+ xt_write_recseq_end(addend);
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+ local_bh_enable();
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+ return verdict;
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+ }
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+
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+ /* We handle fragments by dealing with the first fragment as
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+ * if it was a normal packet. All other fragments are treated
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+ * normally, except that they will NEVER match rules that ask
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+ * things we don't know, ie. tcp syn flag or ports). If the
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+ * rule is also a fragment-specific rule, non-fragments won't
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+ * match it. */
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+ acpar.fragoff = ntohs(ip->frag_off) & IP_OFFSET;
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+ acpar.thoff = ip_hdrlen(skb);
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+ acpar.hotdrop = false;
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+ acpar.in = in;
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+ acpar.out = out;
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+ acpar.family = NFPROTO_IPV4;
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+ acpar.hooknum = hook;
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pr_debug("Entering %s(hook %u); sp at %u (UF %p)\n",
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table->name, hook, origptr,
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