root/net/ipv4/udplite.c

DEFINITIONS

1. udplite_rcv
2. udplite_err
3. udplite4_proc_init_net
4. udplite4_proc_exit_net
5. udplite4_proc_init
6. udplite4_proc_init
7. udplite4_register

/*
 *  UDPLITE     An implementation of the UDP-Lite protocol (RFC 3828).
 *
 *  Authors:    Gerrit Renker       <gerrit@erg.abdn.ac.uk>
 *
 *  Changes:
 *  Fixes:
 *              This program is free software; you can redistribute it and/or
 *              modify it under the terms of the GNU General Public License
 *              as published by the Free Software Foundation; either version
 *              2 of the License, or (at your option) any later version.
 */
#include "udp_impl.h"

struct hlist_head       udplite_hash[UDP_HTABLE_SIZE];

static int udplite_rcv(struct sk_buff *skb)
{
        return __udp4_lib_rcv(skb, udplite_hash, IPPROTO_UDPLITE);
}

static void udplite_err(struct sk_buff *skb, u32 info)
{
        __udp4_lib_err(skb, info, udplite_hash);
}

static  struct net_protocol udplite_protocol = {
        .handler        = udplite_rcv,
        .err_handler    = udplite_err,
        .no_policy      = 1,
        .netns_ok       = 1,
};

struct proto    udplite_prot = {
        .name              = "UDP-Lite",
        .owner             = THIS_MODULE,
        .close             = udp_lib_close,
        .connect           = ip4_datagram_connect,
        .disconnect        = udp_disconnect,
        .ioctl             = udp_ioctl,
        .init              = udplite_sk_init,
        .destroy           = udp_destroy_sock,
        .setsockopt        = udp_setsockopt,
        .getsockopt        = udp_getsockopt,
        .sendmsg           = udp_sendmsg,
        .recvmsg           = udp_recvmsg,
        .sendpage          = udp_sendpage,
        .backlog_rcv       = udp_queue_rcv_skb,
        .hash              = udp_lib_hash,
        .unhash            = udp_lib_unhash,
        .get_port          = udp_v4_get_port,
        .obj_size          = sizeof(struct udp_sock),
        .h.udp_hash        = udplite_hash,
#ifdef CONFIG_COMPAT
        .compat_setsockopt = compat_udp_setsockopt,
        .compat_getsockopt = compat_udp_getsockopt,
#endif
};

static struct inet_protosw udplite4_protosw = {
        .type           =  SOCK_DGRAM,
        .protocol       =  IPPROTO_UDPLITE,
        .prot           =  &udplite_prot,
        .ops            =  &inet_dgram_ops,
        .capability     = -1,
        .no_check       =  0,           /* must checksum (RFC 3828) */
        .flags          =  INET_PROTOSW_PERMANENT,
};

#ifdef CONFIG_PROC_FS
static struct udp_seq_afinfo udplite4_seq_afinfo = {
        .name           = "udplite",
        .family         = AF_INET,
        .hashtable      = udplite_hash,
        .seq_fops       = {
                .owner  =       THIS_MODULE,
        },
        .seq_ops        = {
                .show           = udp4_seq_show,
        },
};

static int udplite4_proc_init_net(struct net *net)
{
        return udp_proc_register(net, &udplite4_seq_afinfo);
}

static void udplite4_proc_exit_net(struct net *net)
{
        udp_proc_unregister(net, &udplite4_seq_afinfo);
}

static struct pernet_operations udplite4_net_ops = {
        .init = udplite4_proc_init_net,
        .exit = udplite4_proc_exit_net,
};

static __init int udplite4_proc_init(void)
{
        return register_pernet_subsys(&udplite4_net_ops);
}
#else
static inline int udplite4_proc_init(void)
{
        return 0;
}
#endif

void __init udplite4_register(void)
{
        if (proto_register(&udplite_prot, 1))
                goto out_register_err;

        if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0)
                goto out_unregister_proto;

        inet_register_protosw(&udplite4_protosw);

        if (udplite4_proc_init())
                printk(KERN_ERR "%s: Cannot register /proc!\n", __func__);
        return;

out_unregister_proto:
        proto_unregister(&udplite_prot);
out_register_err:
        printk(KERN_CRIT "%s: Cannot add UDP-Lite protocol.\n", __func__);
}

EXPORT_SYMBOL(udplite_hash);
EXPORT_SYMBOL(udplite_prot);