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netgraph/ng_nat: Add RFC 6598/Carrier Grade NAT support

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This extends upon the RFC 6598 support to libalias/ipfw in r357092.

Reviewed By:	manpages (bcr), donner, adrian, kp
Approved by:	kp (mentor)
MFC after:	1 month
Differential Revision: https://reviews.freebsd.org/D23461
This commit is contained in:
Neel Chauhan 2021-01-24 20:23:39 +01:00 committed by Lutz Donnerhacke
parent 9bee9a98ff
commit 5fe433a6e4
3 changed files with 10 additions and 1 deletions
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8
share/man/man4/ng_nat.4
View File

@ -24,7 +24,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd December 12, 2018
.Dd January 24, 2021
.Dt NG_NAT 4
.Os
.Sh NAME
@ -75,7 +75,13 @@ struct ng_nat_mode {
#define NG_NAT_RESET_ON_ADDR_CHANGE 0x20
#define NG_NAT_PROXY_ONLY 0x40
#define NG_NAT_REVERSE 0x80
#define NG_NAT_UNREGISTERED_CGN 0x100
.Ed
.Pp
The corresponding libalias flags can be found by replacing the
.Vt "NG_NAT"
prefix with
.Vt "PKT_ALIAS" .
.It Dv NGM_NAT_SET_TARGET Pq Ic settarget
Configure target address for a node.
When an incoming packet not associated with any pre-existing aliasing

2
sys/netgraph/ng_nat.c
View File

@ -961,6 +961,8 @@ ng_nat_translate_flags(unsigned int x)
res |= PKT_ALIAS_PROXY_ONLY;
if (x & NG_NAT_REVERSE)
res |= PKT_ALIAS_REVERSE;
if (x & NG_NAT_UNREGISTERED_CGN)
res |= PKT_ALIAS_UNREGISTERED_CGN;
return (res);
}

1
sys/netgraph/ng_nat.h
View File

@ -54,6 +54,7 @@ struct ng_nat_mode {
#define NG_NAT_RESET_ON_ADDR_CHANGE 0x20
#define NG_NAT_PROXY_ONLY 0x40
#define NG_NAT_REVERSE 0x80
#define NG_NAT_UNREGISTERED_CGN 0x100
#define NG_NAT_DESC_LENGTH 64
#define NG_NAT_REDIRPROTO_ADDR (IPPROTO_MAX + 3) /* LibAlias' LINK_ADDR, also unused in in.h */