dnsmasq: backport fixes

This should fix some error messages shown in the log like this one:
dnsmasq[16020]: failed to send packet: Network unreachable
dnsmasq[16020]: failed to send packet: Address family not supported by protocol

Fixes: e87c0d934c54 ("dnsmasq: Update to version 2.83")
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

3 files changed, 96 insertions, 0 deletions

diff --git a/package/network/services/dnsmasq/patches/0120-Move-fd-into-frec_src-fixes-15b60ddf935a531269bb8c68.patch b/package/network/services/dnsmasq/patches/0120-Move-fd-into-frec_src-fixes-15b60ddf935a531269bb8c68.patch
new file mode 100644
index 0000000000..b2311081a9
--- /dev/null
+++ b/package/network/services/dnsmasq/patches/0120-Move-fd-into-frec_src-fixes-15b60ddf935a531269bb8c68.patch
@@ -0,0 +1,57 @@
+From 04490bf622ac84891aad6f2dd2edf83725decdee Mon Sep 17 00:00:00 2001
+From: Simon Kelley <simon@thekelleys.org.uk>
+Date: Fri, 22 Jan 2021 16:49:12 +0000
+Subject: Move fd into frec_src, fixes 15b60ddf935a531269bb8c68198de012a4967156
+
+If identical queries from IPv4 and IPv6 sources are combined by the
+new code added in 15b60ddf935a531269bb8c68198de012a4967156 then replies
+can end up being sent via the wrong family of socket. The ->fd
+should be per query, not per-question.
+
+In bind-interfaces mode, this could also result in replies being sent
+via the wrong socket even when IPv4/IPV6 issues are not in play.
+---
+ src/dnsmasq.h | 3 ++-
+ src/forward.c | 4 ++--
+ 2 files changed, 4 insertions(+), 3 deletions(-)
+
+--- a/src/dnsmasq.h
++++ b/src/dnsmasq.h
+@@ -653,6 +653,7 @@ struct frec {
+     union mysockaddr source;
+     union all_addr dest;
+     unsigned int iface, log_id;
++    int fd;
+     unsigned short orig_id;
+     struct frec_src *next;
+   } frec_src;
+@@ -660,7 +661,7 @@ struct frec {
+   struct randfd *rfd4;
+   struct randfd *rfd6;
+   unsigned short new_id;
+-  int fd, forwardall, flags;
++  int forwardall, flags;
+   time_t time;
+   unsigned char *hash[HASH_SIZE];
+ #ifdef HAVE_DNSSEC 
+--- a/src/forward.c
++++ b/src/forward.c
+@@ -394,8 +394,8 @@ static int forward_query(int udpfd, unio
+ 	  forward->frec_src.dest = *dst_addr;
+ 	  forward->frec_src.iface = dst_iface;
+ 	  forward->frec_src.next = NULL;
++	  forward->frec_src.fd = udpfd;
+ 	  forward->new_id = get_id();
+-	  forward->fd = udpfd;
+ 	  memcpy(forward->hash, hash, HASH_SIZE);
+ 	  forward->forwardall = 0;
+ 	  forward->flags = fwd_flags;
+@@ -1284,7 +1284,7 @@ void reply_query(int fd, int family, tim
+ 	      dump_packet(DUMP_REPLY, daemon->packet, (size_t)nn, NULL, &src->source);
+ #endif
+ 	      
+-	      send_from(forward->fd, option_bool(OPT_NOWILD) || option_bool (OPT_CLEVERBIND), daemon->packet, nn, 
++	      send_from(src->fd, option_bool(OPT_NOWILD) || option_bool (OPT_CLEVERBIND), daemon->packet, nn, 
+ 			&src->source, &src->dest, src->iface);
+ 
+ 	      if (option_bool(OPT_EXTRALOG) && src != &forward->frec_src)
diff --git a/package/network/services/dnsmasq/patches/0121-Fix-to-75e2f0aec33e58ef5b8d4d107d821c215a52827c.patch b/package/network/services/dnsmasq/patches/0121-Fix-to-75e2f0aec33e58ef5b8d4d107d821c215a52827c.patch
new file mode 100644
index 0000000000..a62439a8a1
--- /dev/null
+++ b/package/network/services/dnsmasq/patches/0121-Fix-to-75e2f0aec33e58ef5b8d4d107d821c215a52827c.patch
@@ -0,0 +1,19 @@
+From 12af2b171de0d678d98583e2190789e544440e02 Mon Sep 17 00:00:00 2001
+From: Simon Kelley <simon@thekelleys.org.uk>
+Date: Fri, 22 Jan 2021 18:24:03 +0000
+Subject: Fix to 75e2f0aec33e58ef5b8d4d107d821c215a52827c
+
+---
+ src/forward.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+--- a/src/forward.c
++++ b/src/forward.c
+@@ -370,6 +370,7 @@ static int forward_query(int udpfd, unio
+ 	      new->dest = *dst_addr;
+ 	      new->log_id = daemon->log_id;
+ 	      new->iface = dst_iface;
++	      forward->frec_src.fd = udpfd;
+ 	    }
+ 	  
+ 	  return 1;
diff --git a/package/network/services/dnsmasq/patches/0123-Fix-for-12af2b171de0d678d98583e2190789e544440e02.patch b/package/network/services/dnsmasq/patches/0123-Fix-for-12af2b171de0d678d98583e2190789e544440e02.patch
new file mode 100644
index 0000000000..1769f77a52
--- /dev/null
+++ b/package/network/services/dnsmasq/patches/0123-Fix-for-12af2b171de0d678d98583e2190789e544440e02.patch
@@ -0,0 +1,20 @@
+From 3f535da79e7a42104543ef5c7b5fa2bed819a78b Mon Sep 17 00:00:00 2001
+From: Simon Kelley <simon@thekelleys.org.uk>
+Date: Fri, 22 Jan 2021 22:26:25 +0000
+Subject: Fix for 12af2b171de0d678d98583e2190789e544440e02
+
+---
+ src/forward.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/src/forward.c
++++ b/src/forward.c
+@@ -370,7 +370,7 @@ static int forward_query(int udpfd, unio
+ 	      new->dest = *dst_addr;
+ 	      new->log_id = daemon->log_id;
+ 	      new->iface = dst_iface;
+-	      forward->frec_src.fd = udpfd;
++	      new->fd = udpfd;
+ 	    }
+ 	  
+ 	  return 1;