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 <linux/proc_fs.h> 18 #include "udp_impl.h" 19 20 struct udp_table udplite_table __read_mostly; 21 EXPORT_SYMBOL(udplite_table); 22 23 static int udplite_rcv(struct sk_buff *skb) 24 { 25 return __udp4_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE); 26 } 27 28 static int udplite_err(struct sk_buff *skb, u32 info) 29 { 30 return __udp4_lib_err(skb, info, &udplite_table); 31 } 32 33 static const struct net_protocol udplite_protocol = { 34 .handler = udplite_rcv, 35 .err_handler = udplite_err, 36 .no_policy = 1, 37 .netns_ok = 1, 38 }; 39 40 struct proto udplite_prot = { 41 .name = "UDP-Lite", 42 .owner = THIS_MODULE, 43 .close = udp_lib_close, 44 .connect = ip4_datagram_connect, 45 .disconnect = udp_disconnect, 46 .ioctl = udp_ioctl, 47 .init = udplite_sk_init, 48 .destroy = udp_destroy_sock, 49 .setsockopt = udp_setsockopt, 50 .getsockopt = udp_getsockopt, 51 .sendmsg = udp_sendmsg, 52 .recvmsg = udp_recvmsg, 53 .sendpage = udp_sendpage, 54 .hash = udp_lib_hash, 55 .unhash = udp_lib_unhash, 56 .rehash = udp_v4_rehash, 57 .get_port = udp_v4_get_port, 58 .memory_allocated = &udp_memory_allocated, 59 .sysctl_mem = sysctl_udp_mem, 60 .obj_size = sizeof(struct udp_sock), 61 .h.udp_table = &udplite_table, 62 #ifdef CONFIG_COMPAT 63 .compat_setsockopt = compat_udp_setsockopt, 64 .compat_getsockopt = compat_udp_getsockopt, 65 #endif 66 }; 67 EXPORT_SYMBOL(udplite_prot); 68 69 static struct inet_protosw udplite4_protosw = { 70 .type = SOCK_DGRAM, 71 .protocol = IPPROTO_UDPLITE, 72 .prot = &udplite_prot, 73 .ops = &inet_dgram_ops, 74 .flags = INET_PROTOSW_PERMANENT, 75 }; 76 77 #ifdef CONFIG_PROC_FS 78 static struct udp_seq_afinfo udplite4_seq_afinfo = { 79 .family = AF_INET, 80 .udp_table = &udplite_table, 81 }; 82 83 static int __net_init udplite4_proc_init_net(struct net *net) 84 { 85 if (!proc_create_net_data("udplite", 0444, net->proc_net, &udp_seq_ops, 86 sizeof(struct udp_iter_state), &udplite4_seq_afinfo)) 87 return -ENOMEM; 88 return 0; 89 } 90 91 static void __net_exit udplite4_proc_exit_net(struct net *net) 92 { 93 remove_proc_entry("udplite", net->proc_net); 94 } 95 96 static struct pernet_operations udplite4_net_ops = { 97 .init = udplite4_proc_init_net, 98 .exit = udplite4_proc_exit_net, 99 }; 100 101 static __init int udplite4_proc_init(void) 102 { 103 return register_pernet_subsys(&udplite4_net_ops); 104 } 105 #else 106 static inline int udplite4_proc_init(void) 107 { 108 return 0; 109 } 110 #endif 111 112 void __init udplite4_register(void) 113 { 114 udp_table_init(&udplite_table, "UDP-Lite"); 115 if (proto_register(&udplite_prot, 1)) 116 goto out_register_err; 117 118 if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0) 119 goto out_unregister_proto; 120 121 inet_register_protosw(&udplite4_protosw); 122 123 if (udplite4_proc_init()) 124 pr_err("%s: Cannot register /proc!\n", __func__); 125 return; 126 127 out_unregister_proto: 128 proto_unregister(&udplite_prot); 129 out_register_err: 130 pr_crit("%s: Cannot add UDP-Lite protocol\n", __func__); 131 } 132