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| author | Taehee Yoo <ap420073@gmail.com> | 2018-01-08 00:10:33 +0900 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2018-01-19 13:59:07 +0100 |
| commit | cc2d58634e0f489d28b5564c05abc69930b4d920 (patch) | |
| tree | 9afca85e29fd84fd8768c162066a3ce8dd2ec3f9 /net/ipv4/netfilter/Kconfig | |
| parent | bea588b0281fa3d2ddf365039d1dfddddcbe9aa2 (diff) | |
| download | linux-cc2d58634e0f489d28b5564c05abc69930b4d920.tar.gz | |
netfilter: nf_nat_snmp_basic: use asn1 decoder library
The basic SNMP ALG parse snmp ASN.1 payload
however, since 2012 linux kernel provide ASN.1 decoder library.
If we use ASN.1 decoder in the /lib/asn1_decoder.c, we can remove
about 1000 line of ASN.1 parsing routine.
To use asn1_decoder.c, we should write mib file(nf_nat_snmp_basic.asn1)
then /script/asn1_compiler.c makes *-asn1.c and *-asn1.h file
at the compiletime.(nf_nat_snmp_basic-asn1.c, nf_nat_snmp_basic-asn1.h)
The nf_nat_snmp_basic.asn1 is made by RFC1155, RFC1157, RFC1902, RFC1905,
RFC2578, RFC3416. of course that mib file supports only the basic SNMP ALG.
Previous SNMP ALG mangles only first octet of IPv4 address.
but after this patch, the SNMP ALG mangles whole IPv4 Address.
And SNMPv3 is not supported.
I tested with snmp commands such ans snmpd, snmpwalk, snmptrap.
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/ipv4/netfilter/Kconfig')
| -rw-r--r-- | net/ipv4/netfilter/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig index f28b08819f890a..5f52236780b4c5 100644 --- a/net/ipv4/netfilter/Kconfig +++ b/net/ipv4/netfilter/Kconfig @@ -158,6 +158,7 @@ config NF_NAT_SNMP_BASIC depends on NF_CONNTRACK_SNMP depends on NETFILTER_ADVANCED default NF_NAT && NF_CONNTRACK_SNMP + select ASN1 ---help--- This module implements an Application Layer Gateway (ALG) for |