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 19 struct udp_table udplite_table __read_mostly; 20 EXPORT_SYMBOL(udplite_table); 21 22 static int udplite_rcv(struct sk_buff *skb) 23 { 24 return __udp4_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE); 25 } 26 27 static void udplite_err(struct sk_buff *skb, u32 info) 28 { 29 __udp4_lib_err(skb, info, &udplite_table); 30 } 31 32 static 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 39 struct 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 }; 66 EXPORT_SYMBOL(udplite_prot); 67 68 static struct inet_protosw udplite4_protosw = { 69 .type = SOCK_DGRAM, 70 .protocol = IPPROTO_UDPLITE, 71 .prot = &udplite_prot, 72 .ops = &inet_dgram_ops, 73 .no_check = 0, /* must checksum (RFC 3828) */ 74 .flags = INET_PROTOSW_PERMANENT, 75 }; 76 77 #ifdef CONFIG_PROC_FS 78 79 static const struct file_operations udplite_afinfo_seq_fops = { 80 .owner = THIS_MODULE, 81 .open = udp_seq_open, 82 .read = seq_read, 83 .llseek = seq_lseek, 84 .release = seq_release_net 85 }; 86 87 static struct udp_seq_afinfo udplite4_seq_afinfo = { 88 .name = "udplite", 89 .family = AF_INET, 90 .udp_table = &udplite_table, 91 .seq_fops = &udplite_afinfo_seq_fops, 92 .seq_ops = { 93 .show = udp4_seq_show, 94 }, 95 }; 96 97 static int __net_init udplite4_proc_init_net(struct net *net) 98 { 99 return udp_proc_register(net, &udplite4_seq_afinfo); 100 } 101 102 static void __net_exit udplite4_proc_exit_net(struct net *net) 103 { 104 udp_proc_unregister(net, &udplite4_seq_afinfo); 105 } 106 107 static struct pernet_operations udplite4_net_ops = { 108 .init = udplite4_proc_init_net, 109 .exit = udplite4_proc_exit_net, 110 }; 111 112 static __init int udplite4_proc_init(void) 113 { 114 return register_pernet_subsys(&udplite4_net_ops); 115 } 116 #else 117 static inline int udplite4_proc_init(void) 118 { 119 return 0; 120 } 121 #endif 122 123 void __init udplite4_register(void) 124 { 125 udp_table_init(&udplite_table, "UDP-Lite"); 126 if (proto_register(&udplite_prot, 1)) 127 goto out_register_err; 128 129 if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0) 130 goto out_unregister_proto; 131 132 inet_register_protosw(&udplite4_protosw); 133 134 if (udplite4_proc_init()) 135 pr_err("%s: Cannot register /proc!\n", __func__); 136 return; 137 138 out_unregister_proto: 139 proto_unregister(&udplite_prot); 140 out_register_err: 141 pr_crit("%s: Cannot add UDP-Lite protocol\n", __func__); 142 } 143