xref: /openbmc/linux/net/smc/smc_diag.c (revision a164c292)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Shared Memory Communications over RDMA (SMC-R) and RoCE
4  *
5  * Monitoring SMC transport protocol sockets
6  *
7  * Copyright IBM Corp. 2016
8  *
9  * Author(s):  Ursula Braun <ubraun@linux.vnet.ibm.com>
10  */
11 
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/types.h>
15 #include <linux/init.h>
16 #include <linux/sock_diag.h>
17 #include <linux/inet_diag.h>
18 #include <linux/smc_diag.h>
19 #include <net/netlink.h>
20 #include <net/smc.h>
21 
22 #include "smc.h"
23 #include "smc_core.h"
24 
25 struct smc_diag_dump_ctx {
26 	int pos[2];
27 };
28 
smc_dump_context(struct netlink_callback * cb)29 static struct smc_diag_dump_ctx *smc_dump_context(struct netlink_callback *cb)
30 {
31 	return (struct smc_diag_dump_ctx *)cb->ctx;
32 }
33 
smc_diag_msg_common_fill(struct smc_diag_msg * r,struct sock * sk)34 static void smc_diag_msg_common_fill(struct smc_diag_msg *r, struct sock *sk)
35 {
36 	struct smc_sock *smc = smc_sk(sk);
37 
38 	memset(r, 0, sizeof(*r));
39 	r->diag_family = sk->sk_family;
40 	sock_diag_save_cookie(sk, r->id.idiag_cookie);
41 	if (!smc->clcsock)
42 		return;
43 	r->id.idiag_sport = htons(smc->clcsock->sk->sk_num);
44 	r->id.idiag_dport = smc->clcsock->sk->sk_dport;
45 	r->id.idiag_if = smc->clcsock->sk->sk_bound_dev_if;
46 	if (sk->sk_protocol == SMCPROTO_SMC) {
47 		r->id.idiag_src[0] = smc->clcsock->sk->sk_rcv_saddr;
48 		r->id.idiag_dst[0] = smc->clcsock->sk->sk_daddr;
49 #if IS_ENABLED(CONFIG_IPV6)
50 	} else if (sk->sk_protocol == SMCPROTO_SMC6) {
51 		memcpy(&r->id.idiag_src, &smc->clcsock->sk->sk_v6_rcv_saddr,
52 		       sizeof(smc->clcsock->sk->sk_v6_rcv_saddr));
53 		memcpy(&r->id.idiag_dst, &smc->clcsock->sk->sk_v6_daddr,
54 		       sizeof(smc->clcsock->sk->sk_v6_daddr));
55 #endif
56 	}
57 }
58 
smc_diag_msg_attrs_fill(struct sock * sk,struct sk_buff * skb,struct smc_diag_msg * r,struct user_namespace * user_ns)59 static int smc_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
60 				   struct smc_diag_msg *r,
61 				   struct user_namespace *user_ns)
62 {
63 	if (nla_put_u8(skb, SMC_DIAG_SHUTDOWN, sk->sk_shutdown))
64 		return 1;
65 
66 	r->diag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
67 	r->diag_inode = sock_i_ino(sk);
68 	return 0;
69 }
70 
__smc_diag_dump(struct sock * sk,struct sk_buff * skb,struct netlink_callback * cb,const struct smc_diag_req * req,struct nlattr * bc)71 static int __smc_diag_dump(struct sock *sk, struct sk_buff *skb,
72 			   struct netlink_callback *cb,
73 			   const struct smc_diag_req *req,
74 			   struct nlattr *bc)
75 {
76 	struct smc_sock *smc = smc_sk(sk);
77 	struct smc_diag_fallback fallback;
78 	struct user_namespace *user_ns;
79 	struct smc_diag_msg *r;
80 	struct nlmsghdr *nlh;
81 
82 	nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
83 			cb->nlh->nlmsg_type, sizeof(*r), NLM_F_MULTI);
84 	if (!nlh)
85 		return -EMSGSIZE;
86 
87 	r = nlmsg_data(nlh);
88 	smc_diag_msg_common_fill(r, sk);
89 	r->diag_state = sk->sk_state;
90 	if (smc->use_fallback)
91 		r->diag_mode = SMC_DIAG_MODE_FALLBACK_TCP;
92 	else if (smc_conn_lgr_valid(&smc->conn) && smc->conn.lgr->is_smcd)
93 		r->diag_mode = SMC_DIAG_MODE_SMCD;
94 	else
95 		r->diag_mode = SMC_DIAG_MODE_SMCR;
96 	user_ns = sk_user_ns(NETLINK_CB(cb->skb).sk);
97 	if (smc_diag_msg_attrs_fill(sk, skb, r, user_ns))
98 		goto errout;
99 
100 	fallback.reason = smc->fallback_rsn;
101 	fallback.peer_diagnosis = smc->peer_diagnosis;
102 	if (nla_put(skb, SMC_DIAG_FALLBACK, sizeof(fallback), &fallback) < 0)
103 		goto errout;
104 
105 	if ((req->diag_ext & (1 << (SMC_DIAG_CONNINFO - 1))) &&
106 	    smc->conn.alert_token_local) {
107 		struct smc_connection *conn = &smc->conn;
108 		struct smc_diag_conninfo cinfo = {
109 			.token = conn->alert_token_local,
110 			.sndbuf_size = conn->sndbuf_desc ?
111 				conn->sndbuf_desc->len : 0,
112 			.rmbe_size = conn->rmb_desc ? conn->rmb_desc->len : 0,
113 			.peer_rmbe_size = conn->peer_rmbe_size,
114 
115 			.rx_prod.wrap = conn->local_rx_ctrl.prod.wrap,
116 			.rx_prod.count = conn->local_rx_ctrl.prod.count,
117 			.rx_cons.wrap = conn->local_rx_ctrl.cons.wrap,
118 			.rx_cons.count = conn->local_rx_ctrl.cons.count,
119 
120 			.tx_prod.wrap = conn->local_tx_ctrl.prod.wrap,
121 			.tx_prod.count = conn->local_tx_ctrl.prod.count,
122 			.tx_cons.wrap = conn->local_tx_ctrl.cons.wrap,
123 			.tx_cons.count = conn->local_tx_ctrl.cons.count,
124 
125 			.tx_prod_flags =
126 				*(u8 *)&conn->local_tx_ctrl.prod_flags,
127 			.tx_conn_state_flags =
128 				*(u8 *)&conn->local_tx_ctrl.conn_state_flags,
129 			.rx_prod_flags = *(u8 *)&conn->local_rx_ctrl.prod_flags,
130 			.rx_conn_state_flags =
131 				*(u8 *)&conn->local_rx_ctrl.conn_state_flags,
132 
133 			.tx_prep.wrap = conn->tx_curs_prep.wrap,
134 			.tx_prep.count = conn->tx_curs_prep.count,
135 			.tx_sent.wrap = conn->tx_curs_sent.wrap,
136 			.tx_sent.count = conn->tx_curs_sent.count,
137 			.tx_fin.wrap = conn->tx_curs_fin.wrap,
138 			.tx_fin.count = conn->tx_curs_fin.count,
139 		};
140 
141 		if (nla_put(skb, SMC_DIAG_CONNINFO, sizeof(cinfo), &cinfo) < 0)
142 			goto errout;
143 	}
144 
145 	if (smc_conn_lgr_valid(&smc->conn) && !smc->conn.lgr->is_smcd &&
146 	    (req->diag_ext & (1 << (SMC_DIAG_LGRINFO - 1))) &&
147 	    !list_empty(&smc->conn.lgr->list)) {
148 		struct smc_link *link = smc->conn.lnk;
149 
150 		struct smc_diag_lgrinfo linfo = {
151 			.role = smc->conn.lgr->role,
152 			.lnk[0].ibport = link->ibport,
153 			.lnk[0].link_id = link->link_id,
154 		};
155 
156 		memcpy(linfo.lnk[0].ibname, link->smcibdev->ibdev->name,
157 		       sizeof(link->smcibdev->ibdev->name));
158 		smc_gid_be16_convert(linfo.lnk[0].gid, link->gid);
159 		smc_gid_be16_convert(linfo.lnk[0].peer_gid, link->peer_gid);
160 
161 		if (nla_put(skb, SMC_DIAG_LGRINFO, sizeof(linfo), &linfo) < 0)
162 			goto errout;
163 	}
164 	if (smc_conn_lgr_valid(&smc->conn) && smc->conn.lgr->is_smcd &&
165 	    (req->diag_ext & (1 << (SMC_DIAG_DMBINFO - 1))) &&
166 	    !list_empty(&smc->conn.lgr->list) && smc->conn.rmb_desc) {
167 		struct smc_connection *conn = &smc->conn;
168 		struct smcd_diag_dmbinfo dinfo;
169 		struct smcd_dev *smcd = conn->lgr->smcd;
170 
171 		memset(&dinfo, 0, sizeof(dinfo));
172 
173 		dinfo.linkid = *((u32 *)conn->lgr->id);
174 		dinfo.peer_gid = conn->lgr->peer_gid;
175 		dinfo.my_gid = smcd->ops->get_local_gid(smcd);
176 		dinfo.token = conn->rmb_desc->token;
177 		dinfo.peer_token = conn->peer_token;
178 
179 		if (nla_put(skb, SMC_DIAG_DMBINFO, sizeof(dinfo), &dinfo) < 0)
180 			goto errout;
181 	}
182 
183 	nlmsg_end(skb, nlh);
184 	return 0;
185 
186 errout:
187 	nlmsg_cancel(skb, nlh);
188 	return -EMSGSIZE;
189 }
190 
smc_diag_dump_proto(struct proto * prot,struct sk_buff * skb,struct netlink_callback * cb,int p_type)191 static int smc_diag_dump_proto(struct proto *prot, struct sk_buff *skb,
192 			       struct netlink_callback *cb, int p_type)
193 {
194 	struct smc_diag_dump_ctx *cb_ctx = smc_dump_context(cb);
195 	struct net *net = sock_net(skb->sk);
196 	int snum = cb_ctx->pos[p_type];
197 	struct nlattr *bc = NULL;
198 	struct hlist_head *head;
199 	int rc = 0, num = 0;
200 	struct sock *sk;
201 
202 	read_lock(&prot->h.smc_hash->lock);
203 	head = &prot->h.smc_hash->ht;
204 	if (hlist_empty(head))
205 		goto out;
206 
207 	sk_for_each(sk, head) {
208 		if (!net_eq(sock_net(sk), net))
209 			continue;
210 		if (num < snum)
211 			goto next;
212 		rc = __smc_diag_dump(sk, skb, cb, nlmsg_data(cb->nlh), bc);
213 		if (rc < 0)
214 			goto out;
215 next:
216 		num++;
217 	}
218 
219 out:
220 	read_unlock(&prot->h.smc_hash->lock);
221 	cb_ctx->pos[p_type] = num;
222 	return rc;
223 }
224 
smc_diag_dump(struct sk_buff * skb,struct netlink_callback * cb)225 static int smc_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
226 {
227 	int rc = 0;
228 
229 	rc = smc_diag_dump_proto(&smc_proto, skb, cb, SMCPROTO_SMC);
230 	if (!rc)
231 		smc_diag_dump_proto(&smc_proto6, skb, cb, SMCPROTO_SMC6);
232 	return skb->len;
233 }
234 
smc_diag_handler_dump(struct sk_buff * skb,struct nlmsghdr * h)235 static int smc_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
236 {
237 	struct net *net = sock_net(skb->sk);
238 
239 	if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
240 	    h->nlmsg_flags & NLM_F_DUMP) {
241 		{
242 			struct netlink_dump_control c = {
243 				.dump = smc_diag_dump,
244 				.min_dump_alloc = SKB_WITH_OVERHEAD(32768),
245 			};
246 			return netlink_dump_start(net->diag_nlsk, skb, h, &c);
247 		}
248 	}
249 	return 0;
250 }
251 
252 static const struct sock_diag_handler smc_diag_handler = {
253 	.family = AF_SMC,
254 	.dump = smc_diag_handler_dump,
255 };
256 
smc_diag_init(void)257 static int __init smc_diag_init(void)
258 {
259 	return sock_diag_register(&smc_diag_handler);
260 }
261 
smc_diag_exit(void)262 static void __exit smc_diag_exit(void)
263 {
264 	sock_diag_unregister(&smc_diag_handler);
265 }
266 
267 module_init(smc_diag_init);
268 module_exit(smc_diag_exit);
269 MODULE_LICENSE("GPL");
270 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 43 /* AF_SMC */);
271 MODULE_ALIAS_GENL_FAMILY(SMCR_GENL_FAMILY_NAME);
272