1/* 2 * UDPLITE An implementation of the UDP-Lite protocol (RFC 3828). 3 * 4 * Authors: Gerrit Renker <gerrit@erg.abdn.ac.uk> 5 * 6 * Changes: 7 * Fixes: 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License 10 * as published by the Free Software Foundation; either version 11 * 2 of the License, or (at your option) any later version. 12 */ 13 14#define pr_fmt(fmt) "UDPLite: " fmt 15 16#include <linux/export.h> 17#include "udp_impl.h" 18 19struct udp_table udplite_table __read_mostly; 20EXPORT_SYMBOL(udplite_table); 21 22static int udplite_rcv(struct sk_buff *skb) 23{ 24 return __udp4_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE); 25} 26 27static void udplite_err(struct sk_buff *skb, u32 info) 28{ 29 __udp4_lib_err(skb, info, &udplite_table); 30} 31 32static const struct net_protocol udplite_protocol = { 33 .handler = udplite_rcv, 34 .err_handler = udplite_err, 35 .no_policy = 1, 36 .netns_ok = 1, 37}; 38 39struct proto udplite_prot = { 40 .name = "UDP-Lite", 41 .owner = THIS_MODULE, 42 .close = udp_lib_close, 43 .connect = ip4_datagram_connect, 44 .disconnect = udp_disconnect, 45 .ioctl = udp_ioctl, 46 .init = udplite_sk_init, 47 .destroy = udp_destroy_sock, 48 .setsockopt = udp_setsockopt, 49 .getsockopt = udp_getsockopt, 50 .sendmsg = udp_sendmsg, 51 .recvmsg = udp_recvmsg, 52 .sendpage = udp_sendpage, 53 .backlog_rcv = udp_queue_rcv_skb, 54 .hash = udp_lib_hash, 55 .unhash = udp_lib_unhash, 56 .get_port = udp_v4_get_port, 57 .obj_size = sizeof(struct udp_sock), 58 .slab_flags = SLAB_DESTROY_BY_RCU, 59 .h.udp_table = &udplite_table, 60#ifdef CONFIG_COMPAT 61 .compat_setsockopt = compat_udp_setsockopt, 62 .compat_getsockopt = compat_udp_getsockopt, 63#endif 64 .clear_sk = sk_prot_clear_portaddr_nulls, 65}; 66EXPORT_SYMBOL(udplite_prot); 67 68static struct inet_protosw udplite4_protosw = { 69 .type = SOCK_DGRAM, 70 .protocol = IPPROTO_UDPLITE, 71 .prot = &udplite_prot, 72 .ops = &inet_dgram_ops, 73 .flags = INET_PROTOSW_PERMANENT, 74}; 75 76#ifdef CONFIG_PROC_FS 77 78static const struct file_operations udplite_afinfo_seq_fops = { 79 .owner = THIS_MODULE, 80 .open = udp_seq_open, 81 .read = seq_read, 82 .llseek = seq_lseek, 83 .release = seq_release_net 84}; 85 86static struct udp_seq_afinfo udplite4_seq_afinfo = { 87 .name = "udplite", 88 .family = AF_INET, 89 .udp_table = &udplite_table, 90 .seq_fops = &udplite_afinfo_seq_fops, 91 .seq_ops = { 92 .show = udp4_seq_show, 93 }, 94}; 95 96static int __net_init udplite4_proc_init_net(struct net *net) 97{ 98 return udp_proc_register(net, &udplite4_seq_afinfo); 99} 100 101static void __net_exit udplite4_proc_exit_net(struct net *net) 102{ 103 udp_proc_unregister(net, &udplite4_seq_afinfo); 104} 105 106static struct pernet_operations udplite4_net_ops = { 107 .init = udplite4_proc_init_net, 108 .exit = udplite4_proc_exit_net, 109}; 110 111static __init int udplite4_proc_init(void) 112{ 113 return register_pernet_subsys(&udplite4_net_ops); 114} 115#else 116static inline int udplite4_proc_init(void) 117{ 118 return 0; 119} 120#endif 121 122void __init udplite4_register(void) 123{ 124 udp_table_init(&udplite_table, "UDP-Lite"); 125 if (proto_register(&udplite_prot, 1)) 126 goto out_register_err; 127 128 if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0) 129 goto out_unregister_proto; 130 131 inet_register_protosw(&udplite4_protosw); 132 133 if (udplite4_proc_init()) 134 pr_err("%s: Cannot register /proc!\n", __func__); 135 return; 136 137out_unregister_proto: 138 proto_unregister(&udplite_prot); 139out_register_err: 140 pr_crit("%s: Cannot add UDP-Lite protocol\n", __func__); 141} 142