diff options
Diffstat (limited to '')
-rw-r--r-- | net/ipv4/udplite.c | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/net/ipv4/udplite.c b/net/ipv4/udplite.c new file mode 100644 index 000000000..56d94d23b --- /dev/null +++ b/net/ipv4/udplite.c @@ -0,0 +1,136 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * UDPLITE An implementation of the UDP-Lite protocol (RFC 3828). + * + * Authors: Gerrit Renker <gerrit@erg.abdn.ac.uk> + * + * Changes: + * Fixes: + */ + +#define pr_fmt(fmt) "UDPLite: " fmt + +#include <linux/export.h> +#include <linux/proc_fs.h> +#include "udp_impl.h" + +struct udp_table udplite_table __read_mostly; +EXPORT_SYMBOL(udplite_table); + +/* Designate sk as UDP-Lite socket */ +static int udplite_sk_init(struct sock *sk) +{ + udp_init_sock(sk); + udp_sk(sk)->pcflag = UDPLITE_BIT; + return 0; +} + +static int udplite_rcv(struct sk_buff *skb) +{ + return __udp4_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE); +} + +static int udplite_err(struct sk_buff *skb, u32 info) +{ + return __udp4_lib_err(skb, info, &udplite_table); +} + +static const struct net_protocol udplite_protocol = { + .handler = udplite_rcv, + .err_handler = udplite_err, + .no_policy = 1, +}; + +struct proto udplite_prot = { + .name = "UDP-Lite", + .owner = THIS_MODULE, + .close = udp_lib_close, + .connect = ip4_datagram_connect, + .disconnect = udp_disconnect, + .ioctl = udp_ioctl, + .init = udplite_sk_init, + .destroy = udp_destroy_sock, + .setsockopt = udp_setsockopt, + .getsockopt = udp_getsockopt, + .sendmsg = udp_sendmsg, + .recvmsg = udp_recvmsg, + .sendpage = udp_sendpage, + .hash = udp_lib_hash, + .unhash = udp_lib_unhash, + .rehash = udp_v4_rehash, + .get_port = udp_v4_get_port, + + .memory_allocated = &udp_memory_allocated, + .per_cpu_fw_alloc = &udp_memory_per_cpu_fw_alloc, + + .sysctl_mem = sysctl_udp_mem, + .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_udp_wmem_min), + .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_udp_rmem_min), + .obj_size = sizeof(struct udp_sock), + .h.udp_table = &udplite_table, +}; +EXPORT_SYMBOL(udplite_prot); + +static struct inet_protosw udplite4_protosw = { + .type = SOCK_DGRAM, + .protocol = IPPROTO_UDPLITE, + .prot = &udplite_prot, + .ops = &inet_dgram_ops, + .flags = INET_PROTOSW_PERMANENT, +}; + +#ifdef CONFIG_PROC_FS +static struct udp_seq_afinfo udplite4_seq_afinfo = { + .family = AF_INET, + .udp_table = &udplite_table, +}; + +static int __net_init udplite4_proc_init_net(struct net *net) +{ + if (!proc_create_net_data("udplite", 0444, net->proc_net, &udp_seq_ops, + sizeof(struct udp_iter_state), &udplite4_seq_afinfo)) + return -ENOMEM; + return 0; +} + +static void __net_exit udplite4_proc_exit_net(struct net *net) +{ + remove_proc_entry("udplite", net->proc_net); +} + +static struct pernet_operations udplite4_net_ops = { + .init = udplite4_proc_init_net, + .exit = udplite4_proc_exit_net, +}; + +static __init int udplite4_proc_init(void) +{ + return register_pernet_subsys(&udplite4_net_ops); +} +#else +static inline int udplite4_proc_init(void) +{ + return 0; +} +#endif + +void __init udplite4_register(void) +{ + udp_table_init(&udplite_table, "UDP-Lite"); + if (proto_register(&udplite_prot, 1)) + goto out_register_err; + + if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0) + goto out_unregister_proto; + + inet_register_protosw(&udplite4_protosw); + + if (udplite4_proc_init()) + pr_err("%s: Cannot register /proc!\n", __func__); + return; + +out_unregister_proto: + proto_unregister(&udplite_prot); +out_register_err: + pr_crit("%s: Cannot add UDP-Lite protocol\n", __func__); +} |