[lwip-devel] [bug #21643] udp_send/raw_send don't fail if netif is down

[Simon Goldschmidt]

Follow-up Comment #5, bug #21643 (project lwip):

> Can post here your patch?

I'm not really sure what to check: netif->ip_addr != 0 or (netif->flags &
NETIF_FLAG_UP) != 0 but I always allow sending when the destination ip address
is BROADCAST.

I do this check right at the beginning of ip_output_if and return ERR_IF
(maybe ERR_RTE is better) if it's not allowed.

Oh, the code size growth is minimal (2 or 3 if-checks):

if (!((dest->addr == INADDR_NONE) ||
      (((netif->flags & NETIF_FLAG_UP) != 0)) && (netif->ip_addr.addr != 0)))
{
    return ERR_IF; /* or ERR_RTE */
}


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