diff options
Diffstat (limited to 'nixos/modules/kernel-patches/0063-netfilter-optional-tcp-window-check.patch')
| -rw-r--r-- | nixos/modules/kernel-patches/0063-netfilter-optional-tcp-window-check.patch | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/nixos/modules/kernel-patches/0063-netfilter-optional-tcp-window-check.patch b/nixos/modules/kernel-patches/0063-netfilter-optional-tcp-window-check.patch new file mode 100644 index 0000000..f0c2423 --- /dev/null +++ b/nixos/modules/kernel-patches/0063-netfilter-optional-tcp-window-check.patch @@ -0,0 +1,96 @@ +From 5433bb138a6a3499b05cb8722c8365cf56047aa1 Mon Sep 17 00:00:00 2001 +From: Felix Fietkau <nbd@nbd.name> +Date: Tue, 27 Sep 2022 16:22:06 +0200 +Subject: [PATCH 63/96] netfilter: optional tcp window check + +Signed-off-by: Felix Fietkau <nbd@nbd.name> +Signed-off-by: Christian 'Ansuel' Marangi <ansuelsmth@gmail.com> +--- + include/net/netns/conntrack.h | 1 + + net/netfilter/nf_conntrack_proto_tcp.c | 8 +++++++- + net/netfilter/nf_conntrack_standalone.c | 10 ++++++++++ + 3 files changed, 18 insertions(+), 1 deletion(-) + +diff --git a/include/net/netns/conntrack.h b/include/net/netns/conntrack.h +index c396a3862e80..82598d767cc3 100644 +--- a/include/net/netns/conntrack.h ++++ b/include/net/netns/conntrack.h +@@ -26,6 +26,7 @@ struct nf_tcp_net { + unsigned int timeouts[TCP_CONNTRACK_TIMEOUT_MAX]; + u8 tcp_loose; + u8 tcp_be_liberal; ++ u8 tcp_no_window_check; + u8 tcp_max_retrans; + u8 tcp_ignore_invalid_rst; + #if IS_ENABLED(CONFIG_NF_FLOW_TABLE) +diff --git a/net/netfilter/nf_conntrack_proto_tcp.c b/net/netfilter/nf_conntrack_proto_tcp.c +index a634c72b1ffc..8bbc8010170d 100644 +--- a/net/netfilter/nf_conntrack_proto_tcp.c ++++ b/net/netfilter/nf_conntrack_proto_tcp.c +@@ -490,6 +490,9 @@ static bool tcp_in_window(struct nf_conn *ct, + s32 receiver_offset; + bool res, in_recv_win; + ++ if (tn->tcp_no_window_check) ++ return true; ++ + /* + * Get the required data from the packet. + */ +@@ -1161,7 +1164,7 @@ int nf_conntrack_tcp_packet(struct nf_conn *ct, + IP_CT_TCP_FLAG_DATA_UNACKNOWLEDGED && + timeouts[new_state] > timeouts[TCP_CONNTRACK_UNACK]) + timeout = timeouts[TCP_CONNTRACK_UNACK]; +- else if (ct->proto.tcp.last_win == 0 && ++ else if (!tn->tcp_no_window_check && ct->proto.tcp.last_win == 0 && + timeouts[new_state] > timeouts[TCP_CONNTRACK_RETRANS]) + timeout = timeouts[TCP_CONNTRACK_RETRANS]; + else +@@ -1477,6 +1480,9 @@ void nf_conntrack_tcp_init_net(struct net *net) + */ + tn->tcp_be_liberal = 0; + ++ /* Skip Windows Check */ ++ tn->tcp_no_window_check = 0; ++ + /* If it's non-zero, we turn off RST sequence number check */ + tn->tcp_ignore_invalid_rst = 0; + +diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c +index 8d3be4cc340e..73a1b6c1737e 100644 +--- a/net/netfilter/nf_conntrack_standalone.c ++++ b/net/netfilter/nf_conntrack_standalone.c +@@ -636,6 +636,7 @@ enum nf_ct_sysctl_index { + #endif + NF_SYSCTL_CT_PROTO_TCP_LOOSE, + NF_SYSCTL_CT_PROTO_TCP_LIBERAL, ++ NF_SYSCTL_CT_PROTO_TCP_NO_WINDOW_CHECK, + NF_SYSCTL_CT_PROTO_TCP_IGNORE_INVALID_RST, + NF_SYSCTL_CT_PROTO_TCP_MAX_RETRANS, + NF_SYSCTL_CT_PROTO_TIMEOUT_UDP, +@@ -852,6 +853,14 @@ static struct ctl_table nf_ct_sysctl_table[] = { + .extra1 = SYSCTL_ZERO, + .extra2 = SYSCTL_ONE, + }, ++ [NF_SYSCTL_CT_PROTO_TCP_NO_WINDOW_CHECK] = { ++ .procname = "nf_conntrack_tcp_no_window_check", ++ .maxlen = sizeof(u8), ++ .mode = 0644, ++ .proc_handler = proc_dou8vec_minmax, ++ .extra1 = SYSCTL_ZERO, ++ .extra2 = SYSCTL_ONE, ++ }, + [NF_SYSCTL_CT_PROTO_TCP_IGNORE_INVALID_RST] = { + .procname = "nf_conntrack_tcp_ignore_invalid_rst", + .maxlen = sizeof(u8), +@@ -1068,6 +1077,7 @@ static void nf_conntrack_standalone_init_tcp_sysctl(struct net *net, + + XASSIGN(LOOSE, &tn->tcp_loose); + XASSIGN(LIBERAL, &tn->tcp_be_liberal); ++ XASSIGN(NO_WINDOW_CHECK, &tn->tcp_no_window_check); + XASSIGN(MAX_RETRANS, &tn->tcp_max_retrans); + XASSIGN(IGNORE_INVALID_RST, &tn->tcp_ignore_invalid_rst); + #undef XASSIGN +-- +2.37.2 + |