lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Message-ID: <CAGK4HS8J2v=2SxmpwXR9vkyXJ9ibhMrPdMgUFxjTyXGt3g7vxA@mail.gmail.com> Date: Thu, 25 Oct 2012 16:15:38 -0700 From: Vijay Subramanian <subramanian.vijay@...il.com> To: Vincent Li <vincent.mc.li@...il.com> Cc: Eric Dumazet <eric.dumazet@...il.com>, "netdev@...r.kernel.org" <netdev@...r.kernel.org> Subject: Re: Disable tcp MSS option in three way handshake? > thanks for the reply, I did a quick look at the code, as a quick dirty > hack, can I change the > > 699 /* Set up TCP options for SYN-ACKs. */ > 700 static unsigned int tcp_synack_options(struct sock *sk, > 701 struct request_sock *req, > 702 unsigned int mss, struct sk_buff *skb, > 703 struct tcp_out_options *opts, > 704 struct tcp_md5sig_key **md5, > 705 struct tcp_extend_values *xvp) > 706 { > > .................. > 730 /* We always send an MSS option. */ > 731 opts->mss = mss; <---------here set opts->mss = 0 ? > > would that work? tcp_make_synack() calls tcp_options_write() has this: if (unlikely(opts->mss)) { *ptr++ = htonl((TCPOPT_MSS << 24) | (TCPOLEN_MSS << 16) | opts->mss); } It will not add the option if opts->mss is zero, so this should work too. Vijay -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists