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 | udpv6_init_sock(sk); |
20 | pr_warn_once("UDP-Lite is deprecated and scheduled to be removed in 2025, " |
21 | "please contact the netdev mailing list\n" ); |
22 | return 0; |
23 | } |
24 | |
25 | static int udplitev6_rcv(struct sk_buff *skb) |
26 | { |
27 | return __udp6_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE); |
28 | } |
29 | |
30 | static int udplitev6_err(struct sk_buff *skb, |
31 | struct inet6_skb_parm *opt, |
32 | u8 type, u8 code, int offset, __be32 info) |
33 | { |
34 | return __udp6_lib_err(skb, opt, type, code, offset, info, |
35 | &udplite_table); |
36 | } |
37 | |
38 | static const struct inet6_protocol udplitev6_protocol = { |
39 | .handler = udplitev6_rcv, |
40 | .err_handler = udplitev6_err, |
41 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
42 | }; |
43 | |
44 | struct proto udplitev6_prot = { |
45 | .name = "UDPLITEv6" , |
46 | .owner = THIS_MODULE, |
47 | .close = udp_lib_close, |
48 | .connect = ip6_datagram_connect, |
49 | .disconnect = udp_disconnect, |
50 | .ioctl = udp_ioctl, |
51 | .init = udplitev6_sk_init, |
52 | .destroy = udpv6_destroy_sock, |
53 | .setsockopt = udpv6_setsockopt, |
54 | .getsockopt = udpv6_getsockopt, |
55 | .sendmsg = udpv6_sendmsg, |
56 | .recvmsg = udpv6_recvmsg, |
57 | .hash = udp_lib_hash, |
58 | .unhash = udp_lib_unhash, |
59 | .rehash = udp_v6_rehash, |
60 | .get_port = udp_v6_get_port, |
61 | |
62 | .memory_allocated = &udp_memory_allocated, |
63 | .per_cpu_fw_alloc = &udp_memory_per_cpu_fw_alloc, |
64 | |
65 | .sysctl_mem = sysctl_udp_mem, |
66 | .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_udp_wmem_min), |
67 | .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_udp_rmem_min), |
68 | .obj_size = sizeof(struct udp6_sock), |
69 | .ipv6_pinfo_offset = offsetof(struct udp6_sock, inet6), |
70 | .h.udp_table = &udplite_table, |
71 | }; |
72 | |
73 | static struct inet_protosw udplite6_protosw = { |
74 | .type = SOCK_DGRAM, |
75 | .protocol = IPPROTO_UDPLITE, |
76 | .prot = &udplitev6_prot, |
77 | .ops = &inet6_dgram_ops, |
78 | .flags = INET_PROTOSW_PERMANENT, |
79 | }; |
80 | |
81 | int __init udplitev6_init(void) |
82 | { |
83 | int ret; |
84 | |
85 | ret = inet6_add_protocol(prot: &udplitev6_protocol, IPPROTO_UDPLITE); |
86 | if (ret) |
87 | goto out; |
88 | |
89 | ret = inet6_register_protosw(p: &udplite6_protosw); |
90 | if (ret) |
91 | goto out_udplitev6_protocol; |
92 | out: |
93 | return ret; |
94 | |
95 | out_udplitev6_protocol: |
96 | inet6_del_protocol(prot: &udplitev6_protocol, IPPROTO_UDPLITE); |
97 | goto out; |
98 | } |
99 | |
100 | void udplitev6_exit(void) |
101 | { |
102 | inet6_unregister_protosw(p: &udplite6_protosw); |
103 | inet6_del_protocol(prot: &udplitev6_protocol, IPPROTO_UDPLITE); |
104 | } |
105 | |
106 | #ifdef CONFIG_PROC_FS |
107 | static struct udp_seq_afinfo udplite6_seq_afinfo = { |
108 | .family = AF_INET6, |
109 | .udp_table = &udplite_table, |
110 | }; |
111 | |
112 | static int __net_init udplite6_proc_init_net(struct net *net) |
113 | { |
114 | if (!proc_create_net_data(name: "udplite6" , mode: 0444, parent: net->proc_net, |
115 | ops: &udp6_seq_ops, state_size: sizeof(struct udp_iter_state), |
116 | data: &udplite6_seq_afinfo)) |
117 | return -ENOMEM; |
118 | return 0; |
119 | } |
120 | |
121 | static void __net_exit udplite6_proc_exit_net(struct net *net) |
122 | { |
123 | remove_proc_entry("udplite6" , net->proc_net); |
124 | } |
125 | |
126 | static struct pernet_operations udplite6_net_ops = { |
127 | .init = udplite6_proc_init_net, |
128 | .exit = udplite6_proc_exit_net, |
129 | }; |
130 | |
131 | int __init udplite6_proc_init(void) |
132 | { |
133 | return register_pernet_subsys(&udplite6_net_ops); |
134 | } |
135 | |
136 | void udplite6_proc_exit(void) |
137 | { |
138 | unregister_pernet_subsys(&udplite6_net_ops); |
139 | } |
140 | #endif |
141 | |