Attachment 106075 Details for Bug 146628 – patch-3.diff

[patch] patch-3.diff

patch-3.diff (text/plain), 1.76 KB, created by oppermann on 2010-08-15 09:11:53 UTC

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Creator: oppermann

Created: 2010-08-15 09:11:53 UTC

Size: 1.76 KB

patch

obsolete

>Index: tcp_subr.c
>===================================================================
>--- tcp_subr.c  (revision 211211)
>+++ tcp_subr.c  (working copy)
>@@ -1339,11 +1325,9 @@
>                                             if (!mtu)
>                                                 mtu = ip_next_mtu(ip->ip_len,
>                                                  1);
>-                                           if (mtu < max(296, V_tcp_minmss
>-                                                + sizeof(struct tcpiphdr)))
>-                                               mtu = 0;
>-                                           if (!mtu)
>-                                               mtu = V_tcp_mssdflt
>+                                           if (mtu < V_tcp_minmss
>+                                                + sizeof(struct tcpiphdr))
>+                                               mtu = V_tcp_minmss
>                                                  + sizeof(struct tcpiphdr);
>                                             /*
>                                              * Only cache the the MTU if it
>Index: tcp_output.c
>===================================================================
>--- tcp_output.c        (revision 211211)
>+++ tcp_output.c        (working copy)
>@@ -1183,8 +1221,10 @@
>          * This might not be the best thing to do according to RFC3390
>          * Section 2. However the tcp hostcache migitates the problem
>          * so it affects only the first tcp connection with a host.
>+        *
>+        * NB: Don't set DF on small MTU/MSS to have a safe fallback.
>          */
>-       if (V_path_mtu_discovery)
>+       if (V_path_mtu_discovery && tp->t_maxopd > V_tcp_minmss)
>                 ip->ip_off |= IP_DF;
>         error = ip_output(m, tp->t_inpcb->inp_options, NULL,

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