[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, 13 insertions, 0 deletions

diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c
index 9c6cbe3d9fb8..cd873da54cbe 100644
--- a/net/ipv4/proc.c
+++ b/net/ipv4/proc.c
@@ -38,6 +38,7 @@
 #include <net/protocol.h>
 #include <net/tcp.h>
 #include <net/udp.h>
+#include <net/udplite.h>
 #include <linux/inetdevice.h>
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
@@ -66,6 +67,7 @@ static int sockstat_seq_show(struct seq_file *seq, void *v)
                    tcp_death_row.tw_count, atomic_read(&tcp_sockets_allocated),
                    atomic_read(&tcp_memory_allocated));
         seq_printf(seq, "UDP: inuse %d\n", fold_prot_inuse(&udp_prot));
+        seq_printf(seq, "UDPLITE: inuse %d\n", fold_prot_inuse(&udplite_prot));
         seq_printf(seq, "RAW: inuse %d\n", fold_prot_inuse(&raw_prot));
         seq_printf(seq,  "FRAG: inuse %d memory %d\n", ip_frag_nqueues,
                    atomic_read(&ip_frag_mem));
@@ -304,6 +306,17 @@ static int snmp_seq_show(struct seq_file *seq, void *v)
                            fold_field((void **) udp_statistics, 
                                       snmp4_udp_list[i].entry));
 
+        /* the UDP and UDP-Lite MIBs are the same */
+        seq_puts(seq, "\nUdpLite:");
+        for (i = 0; snmp4_udp_list[i].name != NULL; i++)
+                seq_printf(seq, " %s", snmp4_udp_list[i].name);
+
+        seq_puts(seq, "\nUdpLite:");
+        for (i = 0; snmp4_udp_list[i].name != NULL; i++)
+                seq_printf(seq, " %lu",
+                           fold_field((void **) udplite_statistics,
+                                      snmp4_udp_list[i].entry)     );
+
         seq_putc(seq, '\n');
         return 0;
 }