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// SPDX-License-Identifier: GPL-2.0-only
/*
* Shared Memory Communications over RDMA (SMC-R) and RoCE
*
* Definitions for the IPPROTO_SMC (socket related)
*
* Copyright IBM Corp. 2016, 2018
* Copyright (c) 2024, Alibaba Inc.
*
* Author: D. Wythe <alibuda@linux.alibaba.com>
*/
#include <net/protocol.h>
#include <net/sock.h>
#include "smc_inet.h"
#include "smc.h"
static int smc_inet_init_sock(struct sock *sk);
static struct proto smc_inet_prot = {
.name = "INET_SMC",
.owner = THIS_MODULE,
.init = smc_inet_init_sock,
.hash = smc_hash_sk,
.unhash = smc_unhash_sk,
.release_cb = smc_release_cb,
.obj_size = sizeof(struct smc_sock),
.h.smc_hash = &smc_v4_hashinfo,
.slab_flags = SLAB_TYPESAFE_BY_RCU,
};
static const struct proto_ops smc_inet_stream_ops = {
.family = PF_INET,
.owner = THIS_MODULE,
.release = smc_release,
.bind = smc_bind,
.connect = smc_connect,
.socketpair = sock_no_socketpair,
.accept = smc_accept,
.getname = smc_getname,
.poll = smc_poll,
.ioctl = smc_ioctl,
.listen = smc_listen,
.shutdown = smc_shutdown,
.setsockopt = smc_setsockopt,
.getsockopt = smc_getsockopt,
.sendmsg = smc_sendmsg,
.recvmsg = smc_recvmsg,
.mmap = sock_no_mmap,
.splice_read = smc_splice_read,
};
static struct inet_protosw smc_inet_protosw = {
.type = SOCK_STREAM,
.protocol = IPPROTO_SMC,
.prot = &smc_inet_prot,
.ops = &smc_inet_stream_ops,
.flags = INET_PROTOSW_ICSK,
};
#if IS_ENABLED(CONFIG_IPV6)
struct smc6_sock {
struct smc_sock smc;
struct ipv6_pinfo inet6;
};
static struct proto smc_inet6_prot = {
.name = "INET6_SMC",
.owner = THIS_MODULE,
.init = smc_inet_init_sock,
.hash = smc_hash_sk,
.unhash = smc_unhash_sk,
.release_cb = smc_release_cb,
.obj_size = sizeof(struct smc6_sock),
.h.smc_hash = &smc_v6_hashinfo,
.slab_flags = SLAB_TYPESAFE_BY_RCU,
.ipv6_pinfo_offset = offsetof(struct smc6_sock, inet6),
};
static const struct proto_ops smc_inet6_stream_ops = {
.family = PF_INET6,
.owner = THIS_MODULE,
.release = smc_release,
.bind = smc_bind,
.connect = smc_connect,
.socketpair = sock_no_socketpair,
.accept = smc_accept,
.getname = smc_getname,
.poll = smc_poll,
.ioctl = smc_ioctl,
.listen = smc_listen,
.shutdown = smc_shutdown,
.setsockopt = smc_setsockopt,
.getsockopt = smc_getsockopt,
.sendmsg = smc_sendmsg,
.recvmsg = smc_recvmsg,
.mmap = sock_no_mmap,
.splice_read = smc_splice_read,
};
static struct inet_protosw smc_inet6_protosw = {
.type = SOCK_STREAM,
.protocol = IPPROTO_SMC,
.prot = &smc_inet6_prot,
.ops = &smc_inet6_stream_ops,
.flags = INET_PROTOSW_ICSK,
};
#endif /* CONFIG_IPV6 */
static unsigned int smc_sync_mss(struct sock *sk, u32 pmtu)
{
/* No need pass it through to clcsock, mss can always be set by
* sock_create_kern or smc_setsockopt.
*/
return 0;
}
static int smc_inet_init_sock(struct sock *sk)
{
struct net *net = sock_net(sk);
/* init common smc sock */
smc_sk_init(net, sk, IPPROTO_SMC);
inet_csk(sk)->icsk_sync_mss = smc_sync_mss;
/* create clcsock */
return smc_create_clcsk(net, sk, sk->sk_family);
}
int __init smc_inet_init(void)
{
int rc;
rc = proto_register(&smc_inet_prot, 1);
if (rc) {
pr_err("%s: proto_register smc_inet_prot fails with %d\n",
__func__, rc);
return rc;
}
/* no return value */
inet_register_protosw(&smc_inet_protosw);
#if IS_ENABLED(CONFIG_IPV6)
rc = proto_register(&smc_inet6_prot, 1);
if (rc) {
pr_err("%s: proto_register smc_inet6_prot fails with %d\n",
__func__, rc);
goto out_inet6_prot;
}
rc = inet6_register_protosw(&smc_inet6_protosw);
if (rc) {
pr_err("%s: inet6_register_protosw smc_inet6_protosw fails with %d\n",
__func__, rc);
goto out_inet6_protosw;
}
return rc;
out_inet6_protosw:
proto_unregister(&smc_inet6_prot);
out_inet6_prot:
inet_unregister_protosw(&smc_inet_protosw);
proto_unregister(&smc_inet_prot);
#endif /* CONFIG_IPV6 */
return rc;
}
void smc_inet_exit(void)
{
#if IS_ENABLED(CONFIG_IPV6)
inet6_unregister_protosw(&smc_inet6_protosw);
proto_unregister(&smc_inet6_prot);
#endif /* CONFIG_IPV6 */
inet_unregister_protosw(&smc_inet_protosw);
proto_unregister(&smc_inet_prot);
}
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