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 #include <linux/export.h> 12 #include <linux/proc_fs.h> 13 #include "udp_impl.h" 14 15 static int udplitev6_sk_init(struct sock *sk) 16 { 17 udpv6_init_sock(sk); 18 udp_sk(sk)->pcflag = UDPLITE_BIT; 19 return 0; 20 } 21 22 static int udplitev6_rcv(struct sk_buff *skb) 23 { 24 return __udp6_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE); 25 } 26 27 static int udplitev6_err(struct sk_buff *skb, 28 struct inet6_skb_parm *opt, 29 u8 type, u8 code, int offset, __be32 info) 30 { 31 return __udp6_lib_err(skb, opt, type, code, offset, info, 32 &udplite_table); 33 } 34 35 static const struct inet6_protocol udplitev6_protocol = { 36 .handler = udplitev6_rcv, 37 .err_handler = udplitev6_err, 38 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 39 }; 40 41 struct proto udplitev6_prot = { 42 .name = "UDPLITEv6", 43 .owner = THIS_MODULE, 44 .close = udp_lib_close, 45 .connect = ip6_datagram_connect, 46 .disconnect = udp_disconnect, 47 .ioctl = udp_ioctl, 48 .init = udplitev6_sk_init, 49 .destroy = udpv6_destroy_sock, 50 .setsockopt = udpv6_setsockopt, 51 .getsockopt = udpv6_getsockopt, 52 .sendmsg = udpv6_sendmsg, 53 .recvmsg = udpv6_recvmsg, 54 .hash = udp_lib_hash, 55 .unhash = udp_lib_unhash, 56 .rehash = udp_v6_rehash, 57 .get_port = udp_v6_get_port, 58 59 .memory_allocated = &udp_memory_allocated, 60 .per_cpu_fw_alloc = &udp_memory_per_cpu_fw_alloc, 61 62 .sysctl_mem = sysctl_udp_mem, 63 .obj_size = sizeof(struct udp6_sock), 64 .h.udp_table = &udplite_table, 65 }; 66 67 static struct inet_protosw udplite6_protosw = { 68 .type = SOCK_DGRAM, 69 .protocol = IPPROTO_UDPLITE, 70 .prot = &udplitev6_prot, 71 .ops = &inet6_dgram_ops, 72 .flags = INET_PROTOSW_PERMANENT, 73 }; 74 75 int __init udplitev6_init(void) 76 { 77 int ret; 78 79 ret = inet6_add_protocol(&udplitev6_protocol, IPPROTO_UDPLITE); 80 if (ret) 81 goto out; 82 83 ret = inet6_register_protosw(&udplite6_protosw); 84 if (ret) 85 goto out_udplitev6_protocol; 86 out: 87 return ret; 88 89 out_udplitev6_protocol: 90 inet6_del_protocol(&udplitev6_protocol, IPPROTO_UDPLITE); 91 goto out; 92 } 93 94 void udplitev6_exit(void) 95 { 96 inet6_unregister_protosw(&udplite6_protosw); 97 inet6_del_protocol(&udplitev6_protocol, IPPROTO_UDPLITE); 98 } 99 100 #ifdef CONFIG_PROC_FS 101 static struct udp_seq_afinfo udplite6_seq_afinfo = { 102 .family = AF_INET6, 103 .udp_table = &udplite_table, 104 }; 105 106 static int __net_init udplite6_proc_init_net(struct net *net) 107 { 108 if (!proc_create_net_data("udplite6", 0444, net->proc_net, 109 &udp6_seq_ops, sizeof(struct udp_iter_state), 110 &udplite6_seq_afinfo)) 111 return -ENOMEM; 112 return 0; 113 } 114 115 static void __net_exit udplite6_proc_exit_net(struct net *net) 116 { 117 remove_proc_entry("udplite6", net->proc_net); 118 } 119 120 static struct pernet_operations udplite6_net_ops = { 121 .init = udplite6_proc_init_net, 122 .exit = udplite6_proc_exit_net, 123 }; 124 125 int __init udplite6_proc_init(void) 126 { 127 return register_pernet_subsys(&udplite6_net_ops); 128 } 129 130 void udplite6_proc_exit(void) 131 { 132 unregister_pernet_subsys(&udplite6_net_ops); 133 } 134 #endif 135