94 lines
2.5 KiB
Diff
94 lines
2.5 KiB
Diff
--- a/include/uapi/linux/netfilter_ipv4/ip_tables.h
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+++ b/include/uapi/linux/netfilter_ipv4/ip_tables.h
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@@ -87,6 +87,7 @@ struct ipt_ip {
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#define IPT_F_FRAG 0x01 /* Set if rule is a fragment rule */
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#define IPT_F_GOTO 0x02 /* Set if jump is a goto */
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#define IPT_F_MASK 0x03 /* All possible flag bits mask. */
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+#define IPT_F_NO_DEF_MATCH 0x80 /* Internal: no default match rules present */
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/* Values for "inv" field in struct ipt_ip. */
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#define IPT_INV_VIA_IN 0x01 /* Invert the sense of IN IFACE. */
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--- a/net/ipv4/netfilter/ip_tables.c
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+++ b/net/ipv4/netfilter/ip_tables.c
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@@ -82,6 +82,9 @@ ip_packet_match(const struct iphdr *ip,
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#define FWINV(bool, invflg) ((bool) ^ !!(ipinfo->invflags & (invflg)))
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+ if (ipinfo->flags & IPT_F_NO_DEF_MATCH)
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+ return true;
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+
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if (FWINV((ip->saddr&ipinfo->smsk.s_addr) != ipinfo->src.s_addr,
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IPT_INV_SRCIP) ||
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FWINV((ip->daddr&ipinfo->dmsk.s_addr) != ipinfo->dst.s_addr,
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@@ -135,6 +138,29 @@ ip_packet_match(const struct iphdr *ip,
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return true;
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}
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+static void
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+ip_checkdefault(struct ipt_ip *ip)
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+{
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+ static const char iface_mask[IFNAMSIZ] = {};
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+
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+ if (ip->invflags || ip->flags & IPT_F_FRAG)
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+ return;
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+
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+ if (memcmp(ip->iniface_mask, iface_mask, IFNAMSIZ) != 0)
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+ return;
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+
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+ if (memcmp(ip->outiface_mask, iface_mask, IFNAMSIZ) != 0)
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+ return;
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+
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+ if (ip->smsk.s_addr || ip->dmsk.s_addr)
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+ return;
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+
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+ if (ip->proto)
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+ return;
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+
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+ ip->flags |= IPT_F_NO_DEF_MATCH;
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+}
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+
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static bool
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ip_checkentry(const struct ipt_ip *ip)
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{
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@@ -560,7 +586,7 @@ static void cleanup_match(struct xt_entr
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}
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static int
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-check_entry(const struct ipt_entry *e, const char *name)
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+check_entry(struct ipt_entry *e, const char *name)
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{
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const struct xt_entry_target *t;
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@@ -569,6 +595,8 @@ check_entry(const struct ipt_entry *e, c
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return -EINVAL;
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}
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+ ip_checkdefault(&e->ip);
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+
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if (e->target_offset + sizeof(struct xt_entry_target) >
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e->next_offset)
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return -EINVAL;
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@@ -930,6 +958,7 @@ copy_entries_to_user(unsigned int total_
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const struct xt_table_info *private = table->private;
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int ret = 0;
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const void *loc_cpu_entry;
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+ u8 flags;
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counters = alloc_counters(table);
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if (IS_ERR(counters))
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@@ -960,6 +989,14 @@ copy_entries_to_user(unsigned int total_
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ret = -EFAULT;
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goto free_counters;
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}
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+
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+ flags = e->ip.flags & IPT_F_MASK;
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+ if (copy_to_user(userptr + off
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+ + offsetof(struct ipt_entry, ip.flags),
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+ &flags, sizeof(flags)) != 0) {
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+ ret = -EFAULT;
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+ goto free_counters;
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+ }
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for (i = sizeof(struct ipt_entry);
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i < e->target_offset;
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