aboutsummaryrefslogtreecommitdiffstats
path: root/net/smc/smc_diag.c
blob: da9ba6d1679b7804f72ff3b3b8e222e1d3dfc833 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Shared Memory Communications over RDMA (SMC-R) and RoCE
 *
 * Monitoring SMC transport protocol sockets
 *
 * Copyright IBM Corp. 2016
 *
 * Author(s):  Ursula Braun <ubraun@linux.vnet.ibm.com>
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/sock_diag.h>
#include <linux/inet_diag.h>
#include <linux/smc_diag.h>
#include <net/netlink.h>
#include <net/smc.h>

#include "smc.h"
#include "smc_core.h"

static void smc_gid_be16_convert(__u8 *buf, u8 *gid_raw)
{
	sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x",
		be16_to_cpu(((__be16 *)gid_raw)[0]),
		be16_to_cpu(((__be16 *)gid_raw)[1]),
		be16_to_cpu(((__be16 *)gid_raw)[2]),
		be16_to_cpu(((__be16 *)gid_raw)[3]),
		be16_to_cpu(((__be16 *)gid_raw)[4]),
		be16_to_cpu(((__be16 *)gid_raw)[5]),
		be16_to_cpu(((__be16 *)gid_raw)[6]),
		be16_to_cpu(((__be16 *)gid_raw)[7]));
}

static void smc_diag_msg_common_fill(struct smc_diag_msg *r, struct sock *sk)
{
	struct smc_sock *smc = smc_sk(sk);

	memset(r, 0, sizeof(*r));
	r->diag_family = sk->sk_family;
	sock_diag_save_cookie(sk, r->id.idiag_cookie);
	if (!smc->clcsock)
		return;
	r->id.idiag_sport = htons(smc->clcsock->sk->sk_num);
	r->id.idiag_dport = smc->clcsock->sk->sk_dport;
	r->id.idiag_if = smc->clcsock->sk->sk_bound_dev_if;
	if (sk->sk_protocol == SMCPROTO_SMC) {
		r->id.idiag_src[0] = smc->clcsock->sk->sk_rcv_saddr;
		r->id.idiag_dst[0] = smc->clcsock->sk->sk_daddr;
#if IS_ENABLED(CONFIG_IPV6)
	} else if (sk->sk_protocol == SMCPROTO_SMC6) {
		memcpy(&r->id.idiag_src, &smc->clcsock->sk->sk_v6_rcv_saddr,
		       sizeof(smc->clcsock->sk->sk_v6_rcv_saddr));
		memcpy(&r->id.idiag_dst, &smc->clcsock->sk->sk_v6_daddr,
		       sizeof(smc->clcsock->sk->sk_v6_daddr));
#endif
	}
}

static int smc_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
				   struct smc_diag_msg *r,
				   struct user_namespace *user_ns)
{
	if (nla_put_u8(skb, SMC_DIAG_SHUTDOWN, sk->sk_shutdown))
		return 1;

	r->diag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
	r->diag_inode = sock_i_ino(sk);
	return 0;
}

static int __smc_diag_dump(struct sock *sk, struct sk_buff *skb,
			   struct netlink_callback *cb,
			   const struct smc_diag_req *req,
			   struct nlattr *bc)
{
	struct smc_sock *smc = smc_sk(sk);
	struct smc_diag_fallback fallback;
	struct user_namespace *user_ns;
	struct smc_diag_msg *r;
	struct nlmsghdr *nlh;

	nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
			cb->nlh->nlmsg_type, sizeof(*r), NLM_F_MULTI);
	if (!nlh)
		return -EMSGSIZE;

	r = nlmsg_data(nlh);
	smc_diag_msg_common_fill(r, sk);
	r->diag_state = sk->sk_state;
	if (smc->use_fallback)
		r->diag_mode = SMC_DIAG_MODE_FALLBACK_TCP;
	else if (smc->conn.lgr && smc->conn.lgr->is_smcd)
		r->diag_mode = SMC_DIAG_MODE_SMCD;
	else
		r->diag_mode = SMC_DIAG_MODE_SMCR;
	user_ns = sk_user_ns(NETLINK_CB(cb->skb).sk);
	if (smc_diag_msg_attrs_fill(sk, skb, r, user_ns))
		goto errout;

	fallback.reason = smc->fallback_rsn;
	fallback.peer_diagnosis = smc->peer_diagnosis;
	if (nla_put(skb, SMC_DIAG_FALLBACK, sizeof(fallback), &fallback) < 0)
		goto errout;

	if ((req->diag_ext & (1 << (SMC_DIAG_CONNINFO - 1))) &&
	    smc->conn.alert_token_local) {
		struct smc_connection *conn = &smc->conn;
		struct smc_diag_conninfo cinfo = {
			.token = conn->alert_token_local,
			.sndbuf_size = conn->sndbuf_desc ?
				conn->sndbuf_desc->len : 0,
			.rmbe_size = conn->rmb_desc ? conn->rmb_desc->len : 0,
			.peer_rmbe_size = conn->peer_rmbe_size,

			.rx_prod.wrap = conn->local_rx_ctrl.prod.wrap,
			.rx_prod.count = conn->local_rx_ctrl.prod.count,
			.rx_cons.wrap = conn->local_rx_ctrl.cons.wrap,
			.rx_cons.count = conn->local_rx_ctrl.cons.count,

			.tx_prod.wrap = conn->local_tx_ctrl.prod.wrap,
			.tx_prod.count = conn->local_tx_ctrl.prod.count,
			.tx_cons.wrap = conn->local_tx_ctrl.cons.wrap,
			.tx_cons.count = conn->local_tx_ctrl.cons.count,

			.tx_prod_flags =
				*(u8 *)&conn->local_tx_ctrl.prod_flags,
			.tx_conn_state_flags =
				*(u8 *)&conn->local_tx_ctrl.conn_state_flags,
			.rx_prod_flags = *(u8 *)&conn->local_rx_ctrl.prod_flags,
			.rx_conn_state_flags =
				*(u8 *)&conn->local_rx_ctrl.conn_state_flags,

			.tx_prep.wrap = conn->tx_curs_prep.wrap,
			.tx_prep.count = conn->tx_curs_prep.count,
			.tx_sent.wrap = conn->tx_curs_sent.wrap,
			.tx_sent.count = conn->tx_curs_sent.count,
			.tx_fin.wrap = conn->tx_curs_fin.wrap,
			.tx_fin.count = conn->tx_curs_fin.count,
		};

		if (nla_put(skb, SMC_DIAG_CONNINFO, sizeof(cinfo), &cinfo) < 0)
			goto errout;
	}

	if (smc->conn.lgr && !smc->conn.lgr->is_smcd &&
	    (req->diag_ext & (1 << (SMC_DIAG_LGRINFO - 1))) &&
	    !list_empty(&smc->conn.lgr->list)) {
		struct smc_diag_lgrinfo linfo = {
			.role = smc->conn.lgr->role,
			.lnk[0].ibport = smc->conn.lgr->lnk[0].ibport,
			.lnk[0].link_id = smc->conn.lgr->lnk[0].link_id,
		};

		memcpy(linfo.lnk[0].ibname,
		       smc->conn.lgr->lnk[0].smcibdev->ibdev->name,
		       sizeof(smc->conn.lgr->lnk[0].smcibdev->ibdev->name));
		smc_gid_be16_convert(linfo.lnk[0].gid,
				     smc->conn.lgr->lnk[0].gid);
		smc_gid_be16_convert(linfo.lnk[0].peer_gid,
				     smc->conn.lgr->lnk[0].peer_gid);

		if (nla_put(skb, SMC_DIAG_LGRINFO, sizeof(linfo), &linfo) < 0)
			goto errout;
	}
	if (smc->conn.lgr && smc->conn.lgr->is_smcd &&
	    (req->diag_ext & (1 << (SMC_DIAG_DMBINFO - 1))) &&
	    !list_empty(&smc->conn.lgr->list)) {
		struct smc_connection *conn = &smc->conn;
		struct smcd_diag_dmbinfo dinfo;

		memset(&dinfo, 0, sizeof(dinfo));

		dinfo.linkid = *((u32 *)conn->lgr->id);
		dinfo.peer_gid = conn->lgr->peer_gid;
		dinfo.my_gid = conn->lgr->smcd->local_gid;
		dinfo.token = conn->rmb_desc->token;
		dinfo.peer_token = conn->peer_token;

		if (nla_put(skb, SMC_DIAG_DMBINFO, sizeof(dinfo), &dinfo) < 0)
			goto errout;
	}

	nlmsg_end(skb, nlh);
	return 0;

errout:
	nlmsg_cancel(skb, nlh);
	return -EMSGSIZE;
}

static int smc_diag_dump_proto(struct proto *prot, struct sk_buff *skb,
			       struct netlink_callback *cb)
{
	struct net *net = sock_net(skb->sk);
	struct nlattr *bc = NULL;
	struct hlist_head *head;
	struct sock *sk;
	int rc = 0;

	read_lock(&prot->h.smc_hash->lock);
	head = &prot->h.smc_hash->ht;
	if (hlist_empty(head))
		goto out;

	sk_for_each(sk, head) {
		if (!net_eq(sock_net(sk), net))
			continue;
		rc = __smc_diag_dump(sk, skb, cb, nlmsg_data(cb->nlh), bc);
		if (rc)
			break;
	}

out:
	read_unlock(&prot->h.smc_hash->lock);
	return rc;
}

static int smc_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
	int rc = 0;

	rc = smc_diag_dump_proto(&smc_proto, skb, cb);
	if (!rc)
		rc = smc_diag_dump_proto(&smc_proto6, skb, cb);
	return rc;
}

static int smc_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
{
	struct net *net = sock_net(skb->sk);

	if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
	    h->nlmsg_flags & NLM_F_DUMP) {
		{
			struct netlink_dump_control c = {
				.dump = smc_diag_dump,
				.min_dump_alloc = SKB_WITH_OVERHEAD(32768),
			};
			return netlink_dump_start(net->diag_nlsk, skb, h, &c);
		}
	}
	return 0;
}

static const struct sock_diag_handler smc_diag_handler = {
	.family = AF_SMC,
	.dump = smc_diag_handler_dump,
};

static int __init smc_diag_init(void)
{
	return sock_diag_register(&smc_diag_handler);
}

static void __exit smc_diag_exit(void)
{
	sock_diag_unregister(&smc_diag_handler);
}

module_init(smc_diag_init);
module_exit(smc_diag_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 43 /* AF_SMC */);