IPv6 UDP packets are not forwarded #45
Description
Tried using pen to forward IPv6 UDP packets. Command line is:
pen -F /etc/pen/upstreams.cfg -U :::80
Content of upstreams.cfg is:
server 0 address 10.1.93.108 port 88
Here is an strace from when a packet is received:
epoll_wait(5, {{EPOLLIN, {u32=4, u64=4}}}, 1002, 3000) = 1
recvfrom(4, "X", 32768, 0, {sa_family=AF_INET6, sin6_port=htons(50290), inet_pton(AF_INET6, "2600:8804:900:440:e8f9:6e8:1c34:348b", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, [28]) = 1
socket(PF_INET6, SOCK_DGRAM|SOCK_NONBLOCK, IPPROTO_IP) = 6
setsockopt(6, SOL_SOCKET, 0xf /* SO_??? */, [1], 4) = 0
getsockname(4, {sa_family=AF_INET6, sin6_port=htons(80), inet_pton(AF_INET6, "::5800:0:0:0", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, [28]) = 0
bind(6, {sa_family=AF_INET6, sin6_port=htons(80), inet_pton(AF_INET6, "::5800:0:0:0", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, 28) = -1 EADDRNOTAVAIL (Cannot assign requested address)
stat("/etc/localtime", {st_mode=S_IFREG|0644, st_size=118, ...}) = 0
socket(PF_LOCAL, SOCK_DGRAM|SOCK_CLOEXEC, 0) = 7
connect(7, {sa_family=AF_LOCAL, sun_path="/dev/log"}, 110) = 0
sendto(7, "<15>Aug 30 20:00:51 pen: bind re"..., 53, MSG_NOSIGNAL, NULL, 0) = 53
close(7) = 0
close(6) = 0
The bind call in the add_client method fails with an EADDRNOTAVAIL because the downfd is being bound to the same address as being used by the listenfd.
Assuming that the bind is fixed, I'm also wondering if a PF_INET6 socket will be able to send a packet to an IPv4 destination.