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Sync ng_nat with recent (r222806) ipfw_nat changes:

Browse Source 
Make a behaviour of the libalias based in-kernel NAT a bit closer to
  how natd(8) does work. natd(8) drops packets only when libalias returns
  PKT_ALIAS_IGNORED and "deny_incoming" option is set, but ipfw_nat
  always did drop packets that were not aliased, even if they should
  not be aliased and just are going through.

Also add SCTP support: mark response packets to skip firewall processing.

MFC after:	1 month
This commit is contained in:
Andrey V. Elsukov 2011-06-07 06:48:42 +00:00
parent bd853db48c
commit c57e67d04e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=222808
1 changed files with 17 additions and 3 deletions
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20
sys/netgraph/ng_nat.c
View File

@ -43,6 +43,7 @@
#include <machine/in_cksum.h>
#include <netinet/libalias/alias.h>
#include <netinet/libalias/alias_local.h>
#include <netgraph/ng_message.h>
#include <netgraph/ng_parse.h>
@ -696,22 +697,35 @@ ng_nat_rcvdata(hook_p hook, item_p item )
KASSERT(m->m_pkthdr.len == ntohs(ip->ip_len),
("ng_nat: ip_len != m_pkthdr.len"));
/*
* We drop packet when:
* 1. libalias returns PKT_ALIAS_ERROR;
* 2. For incoming packets:
* a) for unresolved fragments;
* b) libalias returns PKT_ALIAS_IGNORED and
* PKT_ALIAS_DENY_INCOMING flag is set.
*/
if (hook == priv->in) {
rval = LibAliasIn(priv->lib, c, m->m_len + M_TRAILINGSPACE(m));
if (rval != PKT_ALIAS_OK &&
rval != PKT_ALIAS_FOUND_HEADER_FRAGMENT) {
if (rval == PKT_ALIAS_ERROR ||
rval == PKT_ALIAS_UNRESOLVED_FRAGMENT ||
(rval == PKT_ALIAS_IGNORED &&
(priv->lib->packetAliasMode &
PKT_ALIAS_DENY_INCOMING) != 0)) {
NG_FREE_ITEM(item);
return (EINVAL);
}
} else if (hook == priv->out) {
rval = LibAliasOut(priv->lib, c, m->m_len + M_TRAILINGSPACE(m));
if (rval != PKT_ALIAS_OK) {
if (rval == PKT_ALIAS_ERROR) {
NG_FREE_ITEM(item);
return (EINVAL);
}
} else
panic("ng_nat: unknown hook!\n");
if (rval == PKT_ALIAS_RESPOND)
m->m_flags |= M_SKIP_FIREWALL;
m->m_pkthdr.len = m->m_len = ntohs(ip->ip_len);
if ((ip->ip_off & htons(IP_OFFMASK)) == 0 &&