package/network/services/dnsmasq/patches/0015-Handle-some-corner-cases-in-RA-contructed-interfaces.patch

   1 From db0f488ea8f5ded7c57400c9108ec3c9367d75c5 Mon Sep 17 00:00:00 2001
   2 From: Simon Kelley <simon@thekelleys.org.uk>
   3 Date: Thu, 7 Jun 2018 21:37:02 +0100
   4 Subject: [PATCH 15/17] Handle some corner cases in RA contructed interfaces
   5  with addresses changing interface.
   6
   7 Thanks to Vladislav Grishenko for work on this.
   8
   9 Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
  10 ---
  11  src/dhcp6.c | 16 ++++++++++------
  12  1 file changed, 10 insertions(+), 6 deletions(-)
  13
  14 --- a/src/dhcp6.c
  15 +++ b/src/dhcp6.c
  16 @@ -640,7 +640,7 @@ static int construct_worker(struct in6_a
  17      return 0;
  18
  19    for (template = daemon->dhcp6; template; template = template->next)
  20 -    if (!(template->flags & CONTEXT_TEMPLATE))
  21 +    if (!(template->flags & (CONTEXT_TEMPLATE | CONTEXT_CONSTRUCTED)))
  22        {
  23         /* non-template entries, just fill in interface and local addresses */
  24         if (prefix <= template->prefix &&
  25 @@ -667,20 +667,23 @@ static int construct_worker(struct in6_a
  26         end6 = *local;
  27         setaddr6part(&end6, addr6part(&template->end6));
  28
  29 -       /* If there's an absolute address context covering this address
  30 -          then don't contruct one as well. */
  31         for (context = daemon->dhcp6; context; context = context->next)
  32           if (!(context->flags & CONTEXT_TEMPLATE) &&
  33               IN6_ARE_ADDR_EQUAL(&start6, &context->start6) &&
  34               IN6_ARE_ADDR_EQUAL(&end6, &context->end6))
  35             {
  36 -             if (context->flags & CONTEXT_CONSTRUCTED)
  37 +             /* If there's an absolute address context covering this address
  38 +                then don't construct one as well. */
  39 +             if (!(context->flags & CONTEXT_CONSTRUCTED))
  40 +               break;
  41 +
  42 +             if (context->if_index == if_index)
  43                 {
  44                   int cflags = context->flags;
  45                   context->flags &= ~(CONTEXT_GC | CONTEXT_OLD);
  46                   if (cflags & CONTEXT_OLD)
  47                     {
  48 -                     /* address went, now it's back */
  49 +                     /* address went, now it's back, and on the same interface */
  50                       log_context(AF_INET6, context);
  51                       /* fast RAs for a while */
  52                       ra_start_unsolicited(param->now, context);
  53 @@ -688,9 +691,10 @@ static int construct_worker(struct in6_a
  54                       /* Add address to name again */
  55                       if (context->flags & CONTEXT_RA_NAME)
  56                         param->newname = 1;
  57 +
  58 +                     break;
  59                     }
  60                 }
  61 -             break;
  62             }
  63
  64         if (!context && (context = whine_malloc(sizeof (struct dhcp_context))))