[NET]: Supporting UDP-Lite (RFC 3828) in Linux

This is a revision of the previously submitted patch, which alters
the way files are organized and compiled in the following manner:

	* UDP and UDP-Lite now use separate object files
	* source file dependencies resolved via header files
	  net/ipv{4,6}/udp_impl.h
	* order of inclusion files in udp.c/udplite.c adapted
	  accordingly

[NET/IPv4]: Support for the UDP-Lite protocol (RFC 3828)

This patch adds support for UDP-Lite to the IPv4 stack, provided as an
extension to the existing UDPv4 code:
        * generic routines are all located in net/ipv4/udp.c
        * UDP-Lite specific routines are in net/ipv4/udplite.c
        * MIB/statistics support in /proc/net/snmp and /proc/net/udplite
        * shared API with extensions for partial checksum coverage

[NET/IPv6]: Extension for UDP-Lite over IPv6

It extends the existing UDPv6 code base with support for UDP-Lite
in the same manner as per UDPv4. In particular,
        * UDPv6 generic and shared code is in net/ipv6/udp.c
        * UDP-Litev6 specific extensions are in net/ipv6/udplite.c
        * MIB/statistics support in /proc/net/snmp6 and /proc/net/udplite6
        * support for IPV6_ADDRFORM
        * aligned the coding style of protocol initialisation with af_inet6.c
        * made the error handling in udpv6_queue_rcv_skb consistent;
          to return `-1' on error on all error cases
        * consolidation of shared code

[NET]: UDP-Lite Documentation and basic XFRM/Netfilter support

The UDP-Lite patch further provides
        * API documentation for UDP-Lite
        * basic xfrm support
        * basic netfilter support for IPv4 and IPv6 (LOG target)

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 1 deletions

diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 4a81d54a7569..8db39f7e3bf0 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -104,6 +104,7 @@
 #include <net/inet_connection_sock.h>
 #include <net/tcp.h>
 #include <net/udp.h>
+#include <net/udplite.h>
 #include <linux/skbuff.h>
 #include <net/sock.h>
 #include <net/raw.h>
@@ -1223,10 +1224,13 @@ static int __init init_ipv4_mibs(void)
         tcp_statistics[1] = alloc_percpu(struct tcp_mib);
         udp_statistics[0] = alloc_percpu(struct udp_mib);
         udp_statistics[1] = alloc_percpu(struct udp_mib);
+        udplite_statistics[0] = alloc_percpu(struct udp_mib);
+        udplite_statistics[1] = alloc_percpu(struct udp_mib);
         if (!
             (net_statistics[0] && net_statistics[1] && ip_statistics[0]
              && ip_statistics[1] && tcp_statistics[0] && tcp_statistics[1]
-             && udp_statistics[0] && udp_statistics[1]))
+             && udp_statistics[0] && udp_statistics[1]
+             && udplite_statistics[0] && udplite_statistics[1]             ) )
                 return -ENOMEM;
 
         (void) tcp_mib_init();
@@ -1313,6 +1317,8 @@ static int __init inet_init(void)
         /* Setup TCP slab cache for open requests. */
         tcp_init();
 
+        /* Add UDP-Lite (RFC 3828) */
+        udplite4_register();
 
         /*
          *      Set the ICMP layer up