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netfilter: synproxy: fix erroneous tcp mss option

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Now synproxy sends the mss value set by the user on client syn-ack packet
instead of the mss value that client announced.

Fixes: 48b1de4c11 ("netfilter: add SYNPROXY core/target")
Signed-off-by: Fernando Fernandez Mancera <ffmancera@riseup.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Fernando Fernandez Mancera 2019-07-10 12:05:57 +02:00 committed by Pablo Neira Ayuso
parent f41828ee10
commit b83329fb47
5 changed files with 9 additions and 2 deletions
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1
include/net/netfilter/nf_conntrack_synproxy.h
View File

@ -68,6 +68,7 @@ struct synproxy_options {
u8 options;
u8 wscale;
u16 mss;
u16 mss_encode;
u32 tsval;
u32 tsecr;
};

2
net/ipv4/netfilter/ipt_SYNPROXY.c
View File

@ -36,6 +36,8 @@ synproxy_tg4(struct sk_buff *skb, const struct xt_action_param *par)
opts.options |= XT_SYNPROXY_OPT_ECN;
opts.options &= info->options;
opts.mss_encode = opts.mss;
opts.mss = info->mss;
if (opts.options & XT_SYNPROXY_OPT_TIMESTAMP)
synproxy_init_timestamp_cookie(info, &opts);
else

2
net/ipv6/netfilter/ip6t_SYNPROXY.c
View File

@ -36,6 +36,8 @@ synproxy_tg6(struct sk_buff *skb, const struct xt_action_param *par)
opts.options |= XT_SYNPROXY_OPT_ECN;
opts.options &= info->options;
opts.mss_encode = opts.mss;
opts.mss = info->mss;
if (opts.options & XT_SYNPROXY_OPT_TIMESTAMP)
synproxy_init_timestamp_cookie(info, &opts);
else

4
net/netfilter/nf_synproxy_core.c
View File

@ -470,7 +470,7 @@ synproxy_send_client_synack(struct net *net,
struct iphdr *iph, *niph;
struct tcphdr *nth;
unsigned int tcp_hdr_size;
u16 mss = opts->mss;
u16 mss = opts->mss_encode;
iph = ip_hdr(skb);
@ -884,7 +884,7 @@ synproxy_send_client_synack_ipv6(struct net *net,
struct ipv6hdr *iph, *niph;
struct tcphdr *nth;
unsigned int tcp_hdr_size;
u16 mss = opts->mss;
u16 mss = opts->mss_encode;
iph = ipv6_hdr(skb);

2
net/netfilter/nft_synproxy.c
View File

@ -31,6 +31,8 @@ static void nft_synproxy_tcp_options(struct synproxy_options *opts,
opts->options |= NF_SYNPROXY_OPT_ECN;
opts->options &= priv->info.options;
opts->mss_encode = opts->mss;
opts->mss = info->mss;
if (opts->options & NF_SYNPROXY_OPT_TIMESTAMP)
synproxy_init_timestamp_cookie(info, opts);
else