Date: Thu, 7 Jul 2011 09:32:43 +0000 (UTC) From: "Andrey V. Elsukov" <ae@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-8@freebsd.org Subject: svn commit: r223836 - stable/8/sys/netgraph Message-ID: <201107070932.p679Wh2G055706@svn.freebsd.org>
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Author: ae Date: Thu Jul 7 09:32:43 2011 New Revision: 223836 URL: http://svn.freebsd.org/changeset/base/223836 Log: MFC r222808: Sync ng_nat with recent (r222806) ipfw_nat changes: 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. Modified: stable/8/sys/netgraph/ng_nat.c Directory Properties: stable/8/sys/ (props changed) stable/8/sys/amd64/include/xen/ (props changed) stable/8/sys/cddl/contrib/opensolaris/ (props changed) stable/8/sys/contrib/dev/acpica/ (props changed) stable/8/sys/contrib/pf/ (props changed) Modified: stable/8/sys/netgraph/ng_nat.c ============================================================================== --- stable/8/sys/netgraph/ng_nat.c Thu Jul 7 09:29:11 2011 (r223835) +++ stable/8/sys/netgraph/ng_nat.c Thu Jul 7 09:32:43 2011 (r223836) @@ -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> @@ -703,22 +704,35 @@ 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 &&
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