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Reimplement IPSEC MSS setting

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git-svn-id: https://shorewall.svn.sourceforge.net/svnroot/shorewall/trunk@1695 fbd18981-670d-0410-9b5c-8dc0c1a9a2bb
This commit is contained in:
teastep 2004-10-15 20:00:48 +00:00
parent 86b24f688e
commit 63dc4470ca
4 changed files with 33 additions and 25 deletions
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2
Shorewall2/changelog.txt
View File

@ -109,4 +109,4 @@ Changes since 2.0.3
52) Detect duplicate zone names.
53) Add MSS column to the ipsec file.
53) Add mss=<number> option to the ipsec file.

34
Shorewall2/firewall
View File

@ -1746,12 +1746,32 @@ setup_tunnels() # $1 = name of tunnels file
setup_ipsec() {
set_mss() # $1 = chain
set_mss1() # $1 = chain, $2 = MSS
{
eval local policy=\$${1}_policy
if [ "$policy" != NONE ]; then
ensurechain $1
run_iptables -I $1 -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --set-mss $mss
run_iptables -I $1 -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --set-mss $2
fi
}
set_mss() # $1 = MSS value, $2 = _in, _out or ""
{
if [ $COMMAND != check ]; then
for z in $zones; do
case $2 in
_in)
set_mss1 ${z}2${zone} $1
;;
_out)
set_mss1 ${zone}2${z} $1
;;
*)
set_mss1 ${z}2${zone} $1
set_mss1 ${zone}2${z} $1
;;
esac
done
fi
}
@ -1779,6 +1799,7 @@ setup_ipsec() {
mode!=*) newoptions="$newoptions ! --mode ${option#*=}" ;;
tunnel-src!=*) newoptions="$newoptions ! --tunnel-src ${option#*=}" ;;
tunnel-dst!=*) newoptions="$newoptions ! --tunnel-dst ${option#*=}" ;;
mss=[0-9]*) set_mss ${option#*=} $1 ;;
*) fatal_error "Invalid option \"$option\" for zone $zone" ;;
esac
done
@ -1813,15 +1834,6 @@ setup_ipsec() {
do_options "" $options
do_options "_in" $in_options
do_options "_out" $out_options
if [ $COMMAND != check -a -n "$mss" -a "x$mss" != "x-" ]; then
for z in $zones; do
if [ $z != $zone ]; then
set_mss ${z}2${zone}
set_mss ${zone}2${z}
fi
done
fi
done < $TMP_DIR/ipsec
}

9
Shorewall2/ipsec
View File

@ -24,7 +24,9 @@
# spi=<number> where <number> is the SPI of
# the SA used to encrypt/decrypt packets.
#
# proto=ah|esp|ipcomp
# proto=ah|esp|ipcomp
#
# mss=<number> (sets the MSS field in TCP packets)
#
# mode=transport|tunnel
#
@ -42,9 +44,6 @@
# Example:
# mode=transport,reqid=44
#
# MSS The value that Shorewall should set the MSS field in
# SYN packets to/from this zone.
#
# The options in the OPTIONS column are applied to both incoming
# and outgoing traffic. The IN OPTIONS are applied to incoming
# traffic (in addition to OPTIONS) and the OUT OPTIONS are
@ -53,7 +52,7 @@
# If you wish to leave a column empty but need to make an entry
# in a following column, use "-".
###################################################################################
#ZONE IPSEC OPTIONS IN OUT MSS
#ZONE IPSEC OPTIONS IN OUT
# ONLY OPTIONS OPTIONS
#LAST LINE -- ADD YOUR ENTRIES BEFORE THIS ONE -- DO NOT REMOVE

13
Shorewall2/releasenotes.txt
View File

@ -383,7 +383,7 @@ New Features:
entry.
The OPTIONS, IN OPTIONS and OUT OPTIONS columns specify the
input-output, input and output characteristing of the security
input-output, input and output characteristics of the security
policies to be used to decrypt (input) or encrypt (output) traffic
to/from the zone.
@ -397,7 +397,10 @@ New Features:
option should only be listed in the IN OPTIONS and OUT OPTIONS
columns.
proto[!]=ah|esp|ipcomp
proto[!]=ah|esp|ipcomp
mss=<number> (sets the MSS value in TCP SYN packets and is not
related to policy matching)
mode[!]=transport|tunnel
@ -420,12 +423,6 @@ New Features:
vpn Yes mode=tunnel,proto=esp spi=1000 spi=1001
loc No reqid=44,mode=transport
The last column (MSS) in the /etc/shorewall/ipsec file is intended
to help compensate for the fact that there is no longer a
pseudo-interface (e.g., ipsec0) with it's own MTU. If you specify a
number in this column, Shorewall will generate rules to set the MSS
field in TCP SYN packets the the value of that field.
The /etc/shorewall/masq file has a new IPSEC column added. If you
specify Yes or yes in that column then the unencrypted packets will
have their source address changed. Otherwise, the unencrypted