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Make M_SKIP_FIREWALL a global (and semantic) flag, preventing anything from

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using M_PROTO6 and possibly shooting someone's foot, as well as allowing the
firewall to be used in multiple passes, or with a packet classifier frontend,
that may need to explicitly allow a certain packet.  Presently this is handled
in the ipfw_chk code as before, though I have run with it moved to upper
layers, and possibly it should apply to ipfilter and pf as well, though this
has not been investigated.

Discussed with:	luigi, rwatson
This commit is contained in:
jmallett 2004-07-17 02:40:13 +00:00
parent e2c3152e77
commit 111d2dd115
2 changed files with 2 additions and 14 deletions
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12
sys/netinet/ip_fw2.c
View File

@ -85,18 +85,6 @@
#include <machine/in_cksum.h> /* XXX for in_cksum */
/*
* This is used to avoid that a firewall-generated packet
* loops forever through the firewall. Note that it must
* be a flag that is unused by other protocols that might
* be called from ip_output (e.g. IPsec) and it must be
* listed in M_COPYFLAGS in mbuf.h so that if the mbuf chain
* is altered on the way through ip_output it is not lost.
* It might be better to add an m_tag since the this happens
* infrequently.
*/
#define M_SKIP_FIREWALL M_PROTO6
/*
* set_disable contains one bit per set value (0..31).
* If the bit is set, all rules with the corresponding set

4
sys/sys/mbuf.h
View File

@ -165,7 +165,7 @@ struct mbuf {
#define M_PROTO3 0x0040 /* protocol-specific */
#define M_PROTO4 0x0080 /* protocol-specific */
#define M_PROTO5 0x0100 /* protocol-specific */
#define M_PROTO6 0x4000 /* protocol-specific (avoid M_BCAST conflict) */
#define M_SKIP_FIREWALL 0x4000 /* skip firewall processing */
#define M_FREELIST 0x8000 /* mbuf is on the free list */
/*
@ -192,7 +192,7 @@ struct mbuf {
* Flags copied when copying m_pkthdr.
*/
#define M_COPYFLAGS (M_PKTHDR|M_EOR|M_RDONLY|M_PROTO1|M_PROTO1|M_PROTO2|\
M_PROTO3|M_PROTO4|M_PROTO5|M_PROTO6|\
M_PROTO3|M_PROTO4|M_PROTO5|M_SKIP_FIREWALL|\
M_BCAST|M_MCAST|M_FRAG|M_FIRSTFRAG|M_LASTFRAG)
/*