OpenWrt – Blame information for rev 1
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Rev | Author | Line No. | Line |
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1 | office | 1 | From: Felix Fietkau <nbd@nbd.name> |
2 | Subject: netfilter: optional tcp window check |
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3 | |||
4 | Signed-off-by: Felix Fietkau <nbd@nbd.name> |
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5 | --- |
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6 | net/netfilter/nf_conntrack_proto_tcp.c | 13 +++++++++++++ |
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7 | 1 file changed, 13 insertions(+) |
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8 | |||
9 | --- a/net/netfilter/nf_conntrack_proto_tcp.c |
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10 | +++ b/net/netfilter/nf_conntrack_proto_tcp.c |
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11 | @@ -33,6 +33,9 @@ |
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12 | #include <net/netfilter/ipv4/nf_conntrack_ipv4.h> |
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13 | #include <net/netfilter/ipv6/nf_conntrack_ipv6.h> |
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14 | |||
15 | +/* Do not check the TCP window for incoming packets */ |
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16 | +static int nf_ct_tcp_no_window_check __read_mostly = 1; |
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17 | + |
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18 | /* "Be conservative in what you do, |
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19 | be liberal in what you accept from others." |
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20 | If it's non-zero, we mark only out of window RST segments as INVALID. */ |
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21 | @@ -513,6 +516,9 @@ static bool tcp_in_window(const struct n |
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22 | s32 receiver_offset; |
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23 | bool res, in_recv_win; |
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24 | |||
25 | + if (nf_ct_tcp_no_window_check) |
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26 | + return true; |
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27 | + |
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28 | /* |
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29 | * Get the required data from the packet. |
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30 | */ |
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31 | @@ -1479,6 +1485,13 @@ static struct ctl_table tcp_sysctl_table |
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32 | .mode = 0644, |
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33 | .proc_handler = proc_dointvec, |
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34 | }, |
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35 | + { |
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36 | + .procname = "nf_conntrack_tcp_no_window_check", |
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37 | + .data = &nf_ct_tcp_no_window_check, |
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38 | + .maxlen = sizeof(unsigned int), |
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39 | + .mode = 0644, |
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40 | + .proc_handler = proc_dointvec, |
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41 | + }, |
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42 | { } |
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43 | }; |
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44 | #endif /* CONFIG_SYSCTL */ |