package/network/services/dnsmasq/patches/0011-Handle-standard-and-contructed-dhcp-ranges-on-the-sa.patch

   1 From c488b68e75ee5304007eef37203c4fc10193d191 Mon Sep 17 00:00:00 2001
   2 From: Simon Kelley <simon@thekelleys.org.uk>
   3 Date: Sat, 2 Jun 2018 13:06:00 +0100
   4 Subject: [PATCH 11/17] Handle standard and contructed dhcp-ranges on the same
   5  interface.
   6
   7 Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
   8 ---
   9  CHANGELOG   |  6 ++++++
  10  src/dhcp6.c | 29 +++++++++++++++++------------
  11  2 files changed, 23 insertions(+), 12 deletions(-)
  12
  13 --- a/CHANGELOG
  14 +++ b/CHANGELOG
  15 @@ -23,6 +23,12 @@ version 2.80
  16         which packets should be dumped is given by the --dumpmask
  17         option.
  18
  19 +       Handle the case of both standard and constructed dhcp-ranges on the
  20 +       same interface better. We don't now contruct a dhcp-range if there's
  21 +       already one specified. This allows the specified interface to
  22 +       have different parameters and avoids advertising the same
  23 +       prefix twice. Thanks to Luis Marsano for spotting this case.
  24 +
  25
  26  version 2.79
  27         Fix parsing of CNAME arguments, which are confused by extra spaces.
  28 --- a/src/dhcp6.c
  29 +++ b/src/dhcp6.c
  30 @@ -667,23 +667,28 @@ static int construct_worker(struct in6_a
  31         end6 = *local;
  32         setaddr6part(&end6, addr6part(&template->end6));
  33
  34 +       /* If there's an absolute address context covering this address
  35 +          then don't contruct one as well. */
  36         for (context = daemon->dhcp6; context; context = context->next)
  37 -         if ((context->flags & CONTEXT_CONSTRUCTED) &&
  38 +         if (!(context->flags & CONTEXT_TEMPLATE) &&
  39               IN6_ARE_ADDR_EQUAL(&start6, &context->start6) &&
  40               IN6_ARE_ADDR_EQUAL(&end6, &context->end6))
  41             {
  42 -             int flags = context->flags;
  43 -             context->flags &= ~(CONTEXT_GC | CONTEXT_OLD);
  44 -             if (flags & CONTEXT_OLD)
  45 +             if (context->flags & CONTEXT_CONSTRUCTED)
  46                 {
  47 -                 /* address went, now it's back */
  48 -                 log_context(AF_INET6, context);
  49 -                 /* fast RAs for a while */
  50 -                 ra_start_unsolicited(param->now, context);
  51 -                 param->newone = 1;
  52 -                 /* Add address to name again */
  53 -                 if (context->flags & CONTEXT_RA_NAME)
  54 -                   param->newname = 1;
  55 +                 int cflags = context->flags;
  56 +                 context->flags &= ~(CONTEXT_GC | CONTEXT_OLD);
  57 +                 if (cflags & CONTEXT_OLD)
  58 +                   {
  59 +                     /* address went, now it's back */
  60 +                     log_context(AF_INET6, context);
  61 +                     /* fast RAs for a while */
  62 +                     ra_start_unsolicited(param->now, context);
  63 +                     param->newone = 1;
  64 +                     /* Add address to name again */
  65 +                     if (context->flags & CONTEXT_RA_NAME)
  66 +                       param->newname = 1;
  67 +                   }
  68                 }
  69               break;
  70             }