Clarified packet ownership transfer between a few functions.
Added a large number of missing calls to free_pkb(). In the case of UDP,
no received packets were ever freed, which lead to memory exhaustion
remarkably quickly once pxelinux started up.
In general, any function with _rx() in its name which accepts a pk_buff
*must* either call free_pkb() or pass the pkb to another _rx() function
(e.g. the next layer up the stack). Since the UDP (and TCP) layers don't
pass packet buffers up to the higher-layer protocols (the
"applications"), they must free the packet buffer after calling the
application's newdata() method.
Remove unused attribute from __table macros; the tables are no longer
static since otherwise gcc4 optimises them away completely. Also, it
really *is* an error if the table start and end are unused, so they
certainly shouldn't be marked with attribute unused.
Make the UDP senddata() methods return a status code.
udp_connect() now follows the standard BSD sockets semantics and simply
sets the default address for outgoing packets; it doesn't filter incoming
packets.
Updated PXE UDP implementation to use the new Etherboot UDP API.
Updated PXE API dispatcher to use copy_{to,from}_user, and moved to
arch/i386 since the implementation is quite architecture-dependent.
(The individual PXE API calls can be largely
architecture-independent.)
Parameter request list is yet another option that ISC dhcpd ignores
unless it's in the main options block.
Fix logic error in parsing file and sname fields.