1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * UDPLITEv6 An implementation of the UDP-Lite protocol over IPv6. 4 * See also net/ipv4/udplite.c 5 * 6 * Authors: Gerrit Renker <gerrit@erg.abdn.ac.uk> 7 * 8 * Changes: 9 * Fixes: 10 */ 11 #define pr_fmt(fmt) "UDPLite6: " fmt 12 13 #include <linux/export.h> 14 #include <linux/proc_fs.h> 15 #include "udp_impl.h" 16 17 static int udplitev6_sk_init(struct sock *sk) 18 { 19 pr_warn_once("UDP-Lite is deprecated and scheduled to be removed in 2025, " 20 "please contact the netdev mailing list\n"); 21 return udpv6_init_sock(sk); 22 } 23 24 static int udplitev6_rcv(struct sk_buff *skb) 25 { 26 return __udp6_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE); 27 } 28 29 static int udplitev6_err(struct sk_buff *skb, 30 struct inet6_skb_parm *opt, 31 u8 type, u8 code, int offset, __be32 info) 32 { 33 return __udp6_lib_err(skb, opt, type, code, offset, info, 34 &udplite_table); 35 } 36 37 static const struct inet6_protocol udplitev6_protocol = { 38 .handler = udplitev6_rcv, 39 .err_handler = udplitev6_err, 40 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 41 }; 42 43 struct proto udplitev6_prot = { 44 .name = "UDPLITEv6", 45 .owner = THIS_MODULE, 46 .close = udp_lib_close, 47 .connect = ip6_datagram_connect, 48 .disconnect = udp_disconnect, 49 .ioctl = udp_ioctl, 50 .init = udplitev6_sk_init, 51 .destroy = udpv6_destroy_sock, 52 .setsockopt = udpv6_setsockopt, 53 .getsockopt = udpv6_getsockopt, 54 .sendmsg = udpv6_sendmsg, 55 .recvmsg = udpv6_recvmsg, 56 .hash = udp_lib_hash, 57 .unhash = udp_lib_unhash, 58 .rehash = udp_v6_rehash, 59 .get_port = udp_v6_get_port, 60 61 .memory_allocated = &net_aligned_data.udp_memory_allocated, 62 .per_cpu_fw_alloc = &udp_memory_per_cpu_fw_alloc, 63 64 .sysctl_mem = sysctl_udp_mem, 65 .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_udp_wmem_min), 66 .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_udp_rmem_min), 67 .obj_size = sizeof(struct udp6_sock), 68 .ipv6_pinfo_offset = offsetof(struct udp6_sock, inet6), 69 .h.udp_table = &udplite_table, 70 }; 71 72 static struct inet_protosw udplite6_protosw = { 73 .type = SOCK_DGRAM, 74 .protocol = IPPROTO_UDPLITE, 75 .prot = &udplitev6_prot, 76 .ops = &inet6_dgram_ops, 77 .flags = INET_PROTOSW_PERMANENT, 78 }; 79 80 int __init udplitev6_init(void) 81 { 82 int ret; 83 84 ret = inet6_add_protocol(&udplitev6_protocol, IPPROTO_UDPLITE); 85 if (ret) 86 goto out; 87 88 ret = inet6_register_protosw(&udplite6_protosw); 89 if (ret) 90 goto out_udplitev6_protocol; 91 out: 92 return ret; 93 94 out_udplitev6_protocol: 95 inet6_del_protocol(&udplitev6_protocol, IPPROTO_UDPLITE); 96 goto out; 97 } 98 99 void udplitev6_exit(void) 100 { 101 inet6_unregister_protosw(&udplite6_protosw); 102 inet6_del_protocol(&udplitev6_protocol, IPPROTO_UDPLITE); 103 } 104 105 #ifdef CONFIG_PROC_FS 106 static struct udp_seq_afinfo udplite6_seq_afinfo = { 107 .family = AF_INET6, 108 .udp_table = &udplite_table, 109 }; 110 111 static int __net_init udplite6_proc_init_net(struct net *net) 112 { 113 if (!proc_create_net_data("udplite6", 0444, net->proc_net, 114 &udp6_seq_ops, sizeof(struct udp_iter_state), 115 &udplite6_seq_afinfo)) 116 return -ENOMEM; 117 return 0; 118 } 119 120 static void __net_exit udplite6_proc_exit_net(struct net *net) 121 { 122 remove_proc_entry("udplite6", net->proc_net); 123 } 124 125 static struct pernet_operations udplite6_net_ops = { 126 .init = udplite6_proc_init_net, 127 .exit = udplite6_proc_exit_net, 128 }; 129 130 int __init udplite6_proc_init(void) 131 { 132 return register_pernet_subsys(&udplite6_net_ops); 133 } 134 135 void udplite6_proc_exit(void) 136 { 137 unregister_pernet_subsys(&udplite6_net_ops); 138 } 139 #endif 140