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102 lines
2.9 KiB
Diff
102 lines
2.9 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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@@ -650,6 +676,8 @@ find_check_entry(struct ipt_entry *e, st
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struct xt_mtchk_param mtpar;
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struct xt_entry_match *ematch;
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+ ip_checkdefault(&e->ip);
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+
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j = 0;
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memset(&mtpar, 0, sizeof(mtpar));
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mtpar.net = net;
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@@ -943,6 +971,7 @@ 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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@@ -974,6 +1003,14 @@ copy_entries_to_user(unsigned int total_
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goto free_counters;
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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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+
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for (i = sizeof(struct ipt_entry);
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i < e->target_offset;
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i += m->u.match_size) {
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@@ -1380,12 +1417,15 @@ compat_copy_entry_to_user(struct ipt_ent
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compat_uint_t origsize;
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const struct xt_entry_match *ematch;
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int ret = 0;
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+ u8 flags = e->ip.flags & IPT_F_MASK;
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origsize = *size;
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ce = (struct compat_ipt_entry __user *)*dstptr;
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if (copy_to_user(ce, e, sizeof(struct ipt_entry)) != 0 ||
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copy_to_user(&ce->counters, &counters[i],
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- sizeof(counters[i])) != 0)
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+ sizeof(counters[i])) != 0 ||
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+ copy_to_user(&ce->ip.flags, &flags,
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+ sizeof(flags)) != 0)
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return -EFAULT;
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*dstptr += sizeof(struct compat_ipt_entry);
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