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netfilter: conntrack: add new sysctl to disable RST check 

This patch adds a new sysctl tcp_ignore_invalid_rst to disable marking
out of segments RSTs as INVALID.

Signed-off-by: Ali Abdallah <aabdallah@suse.de>
Acked-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Ali Abdallah 2021-05-27 09:19:06 +02:00 committed by Pablo Neira Ayuso
parent c4edc3ccbc
commit 1da4cd82dd
4 changed files with 22 additions and 1 deletions
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6
Documentation/networking/nf_conntrack-sysctl.rst
View File

@ -110,6 +110,12 @@ nf_conntrack_tcp_be_liberal - BOOLEAN
Be conservative in what you do, be liberal in what you accept from others.
If it's non-zero, we mark only out of window RST segments as INVALID.
nf_conntrack_tcp_ignore_invalid_rst - BOOLEAN
- 0 - disabled (default)
- 1 - enabled
If it's 1, we don't mark out of window RST segments as INVALID.
nf_conntrack_tcp_loose - BOOLEAN
- 0 - disabled
- not 0 - enabled (default)

1
include/net/netns/conntrack.h
View File

@ -27,6 +27,7 @@ struct nf_tcp_net {
u8 tcp_loose;
u8 tcp_be_liberal;
u8 tcp_max_retrans;
u8 tcp_ignore_invalid_rst;
#if IS_ENABLED(CONFIG_NF_FLOW_TABLE)
unsigned int offload_timeout;
unsigned int offload_pickup;

6
net/netfilter/nf_conntrack_proto_tcp.c
View File

@ -1068,7 +1068,8 @@ int nf_conntrack_tcp_packet(struct nf_conn *ct,
if (seq == 0 && !nf_conntrack_tcp_established(ct))
break;
if (before(seq, ct->proto.tcp.seen[!dir].td_maxack)) {
if (before(seq, ct->proto.tcp.seen[!dir].td_maxack) &&
!tn->tcp_ignore_invalid_rst) {
/* Invalid RST */
spin_unlock_bh(&ct->lock);
nf_ct_l4proto_log_invalid(skb, ct, state, "invalid rst");
@ -1466,6 +1467,9 @@ void nf_conntrack_tcp_init_net(struct net *net)
*/
tn->tcp_be_liberal = 0;
/* If it's non-zero, we turn off RST sequence number check */
tn->tcp_ignore_invalid_rst = 0;
/* Max number of the retransmitted packets without receiving an (acceptable)
* ACK from the destination. If this number is reached, a shorter timer
* will be started.

10
net/netfilter/nf_conntrack_standalone.c
View File

@ -579,6 +579,7 @@ enum nf_ct_sysctl_index {
#endif
NF_SYSCTL_CT_PROTO_TCP_LOOSE,
NF_SYSCTL_CT_PROTO_TCP_LIBERAL,
NF_SYSCTL_CT_PROTO_TCP_IGNORE_INVALID_RST,
NF_SYSCTL_CT_PROTO_TCP_MAX_RETRANS,
NF_SYSCTL_CT_PROTO_TIMEOUT_UDP,
NF_SYSCTL_CT_PROTO_TIMEOUT_UDP_STREAM,
@ -798,6 +799,14 @@ static struct ctl_table nf_ct_sysctl_table[] = {
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE,
},
[NF_SYSCTL_CT_PROTO_TCP_IGNORE_INVALID_RST] = {
.procname = "nf_conntrack_tcp_ignore_invalid_rst",
.maxlen = sizeof(u8),
.mode = 0644,
.proc_handler = proc_dou8vec_minmax,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE,
},
[NF_SYSCTL_CT_PROTO_TCP_MAX_RETRANS] = {
.procname = "nf_conntrack_tcp_max_retrans",
.maxlen = sizeof(u8),
@ -1004,6 +1013,7 @@ static void nf_conntrack_standalone_init_tcp_sysctl(struct net *net,
XASSIGN(LOOSE, &tn->tcp_loose);
XASSIGN(LIBERAL, &tn->tcp_be_liberal);
XASSIGN(MAX_RETRANS, &tn->tcp_max_retrans);
XASSIGN(IGNORE_INVALID_RST, &tn->tcp_ignore_invalid_rst);
#undef XASSIGN
#if IS_ENABLED(CONFIG_NF_FLOW_TABLE)