10000 Fix UDP send to IPv6 link local addresses by nomis · Pull Request #6541 · esp8266/Arduino · GitHub
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Fix UDP send to IPv6 link local addresses #6541

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Merged
merged 2 commits into from
Apr 11, 2020
Merged

Fix UDP send to IPv6 link local addresses #6541

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3aeb851
Fix UDP send to IPv6 link local addresses
nomis Sep 20, 2019
13f0760
Merge branch 'master' into udp-ipv6-linklocal-fix
d-a-v Apr 11, 2020
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Fix UDP send to IPv6 link local addresses 
lwIP's tcp/udp_connect() and tcp/udp_bind() functions automatically
set the zone if it is required but missing, but udp_connect() is not
used so this doesn't happen.

Explicitly set the zone to the default network interface if it is
required for the type of address being used. Otherwise there is no
zone set and packets to a link local destination don't go anywhere.
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@nomis
nomis committed Sep 20, 2019
commit 3aeb851ea781645a6c3ee7f34f06892db315dbc6
6 changes: 6 additions & 0 deletions libraries/ESP8266WiFi/src/include/UdpContext.h
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Original file line number Diff line number Diff line change
Expand Up @@ -112,6 +112,12 @@ class UdpContext
{
_pcb->remote_ip = addr;
_pcb->remote_port = port;
#if LWIP_IPV6
// Set zone so that link local addresses use the default interface
if (IP_IS_V6(&_pcb->remote_ip) && ip6_addr_lacks_zone(ip_2_ip6(&_pcb->remote_ip), IP6_UNKNOWN)) {
ip6_addr_assign_zone(ip_2_ip6(&_pcb->remote_ip),IP6_UNKNOWN, netif_default);
}
#endif
return true;
}

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