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
udplitev6_sk_init(struct sock * sk)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
udplitev6_rcv(struct sk_buff * skb)22 static int udplitev6_rcv(struct sk_buff *skb)
23 {
24 return __udp6_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE);
25 }
26
udplitev6_err(struct sk_buff * skb,struct inet6_skb_parm * opt,u8 type,u8 code,int offset,__be32 info)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 .memory_allocated = &udp_memory_allocated,
59 .sysctl_mem = sysctl_udp_mem,
60 .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_udp_wmem_min),
61 .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_udp_rmem_min),
62 .obj_size = sizeof(struct udp6_sock),
63 .h.udp_table = &udplite_table,
64 #ifdef CONFIG_COMPAT
65 .compat_setsockopt = compat_udpv6_setsockopt,
66 .compat_getsockopt = compat_udpv6_getsockopt,
67 #endif
68 };
69
70 static struct inet_protosw udplite6_protosw = {
71 .type = SOCK_DGRAM,
72 .protocol = IPPROTO_UDPLITE,
73 .prot = &udplitev6_prot,
74 .ops = &inet6_dgram_ops,
75 .flags = INET_PROTOSW_PERMANENT,
76 };
77
udplitev6_init(void)78 int __init udplitev6_init(void)
79 {
80 int ret;
81
82 ret = inet6_add_protocol(&udplitev6_protocol, IPPROTO_UDPLITE);
83 if (ret)
84 goto out;
85
86 ret = inet6_register_protosw(&udplite6_protosw);
87 if (ret)
88 goto out_udplitev6_protocol;
89 out:
90 return ret;
91
92 out_udplitev6_protocol:
93 inet6_del_protocol(&udplitev6_protocol, IPPROTO_UDPLITE);
94 goto out;
95 }
96
udplitev6_exit(void)97 void udplitev6_exit(void)
98 {
99 inet6_unregister_protosw(&udplite6_protosw);
100 inet6_del_protocol(&udplitev6_protocol, IPPROTO_UDPLITE);
101 }
102
103 #ifdef CONFIG_PROC_FS
104 static struct udp_seq_afinfo udplite6_seq_afinfo = {
105 .family = AF_INET6,
106 .udp_table = &udplite_table,
107 };
108
udplite6_proc_init_net(struct net * net)109 static int __net_init udplite6_proc_init_net(struct net *net)
110 {
111 if (!proc_create_net_data("udplite6", 0444, net->proc_net,
112 &udp6_seq_ops, sizeof(struct udp_iter_state),
113 &udplite6_seq_afinfo))
114 return -ENOMEM;
115 return 0;
116 }
117
udplite6_proc_exit_net(struct net * net)118 static void __net_exit udplite6_proc_exit_net(struct net *net)
119 {
120 remove_proc_entry("udplite6", net->proc_net);
121 }
122
123 static struct pernet_operations udplite6_net_ops = {
124 .init = udplite6_proc_init_net,
125 .exit = udplite6_proc_exit_net,
126 };
127
udplite6_proc_init(void)128 int __init udplite6_proc_init(void)
129 {
130 return register_pernet_subsys(&udplite6_net_ops);
131 }
132
udplite6_proc_exit(void)133 void udplite6_proc_exit(void)
134 {
135 unregister_pernet_subsys(&udplite6_net_ops);
136 }
137 #endif
138