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 #include "smc_ism.h"
25
26 struct smc_diag_dump_ctx {
27 int pos[2];
28 };
29
30 static struct smc_diag_dump_ctx *smc_dump_context(struct netlink_callback *cb)
31 {
32 return (struct smc_diag_dump_ctx *)cb->ctx;
33 }
34
35 static void smc_diag_msg_common_fill(struct smc_diag_msg *r, struct sock *sk)
36 {
37 struct smc_sock *smc = smc_sk(sk);
38
39 memset(r, 0, sizeof(*r));
40 r->diag_family = sk->sk_family;
41 sock_diag_save_cookie(sk, r->id.idiag_cookie);
42 if (!smc->clcsock)
43 return;
44 r->id.idiag_sport = htons(smc->clcsock->sk->sk_num);
45 r->id.idiag_dport = smc->clcsock->sk->sk_dport;
46 r->id.idiag_if = smc->clcsock->sk->sk_bound_dev_if;
47 if (sk->sk_protocol == SMCPROTO_SMC) {
48 r->id.idiag_src[0] = smc->clcsock->sk->sk_rcv_saddr;
49 r->id.idiag_dst[0] = smc->clcsock->sk->sk_daddr;
50 #if IS_ENABLED(CONFIG_IPV6)
51 } else if (sk->sk_protocol == SMCPROTO_SMC6) {
52 memcpy(&r->id.idiag_src, &smc->clcsock->sk->sk_v6_rcv_saddr,
53 sizeof(smc->clcsock->sk->sk_v6_rcv_saddr));
54 memcpy(&r->id.idiag_dst, &smc->clcsock->sk->sk_v6_daddr,
55 sizeof(smc->clcsock->sk->sk_v6_daddr));
56 #endif
57 }
58 }
59
60 static int smc_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
61 struct smc_diag_msg *r,
62 struct user_namespace *user_ns)
63 {
64 if (nla_put_u8(skb, SMC_DIAG_SHUTDOWN, sk->sk_shutdown))
65 return 1;
66
67 r->diag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
68 r->diag_inode = sock_i_ino(sk);
69 return 0;
70 }
71
72 static int __smc_diag_dump(struct sock *sk, struct sk_buff *skb,
73 struct netlink_callback *cb,
74 const struct smc_diag_req *req,
75 struct nlattr *bc)
76 {
77 struct smc_sock *smc = smc_sk(sk);
78 struct smc_diag_fallback fallback;
79 struct user_namespace *user_ns;
80 struct smc_diag_msg *r;
81 struct nlmsghdr *nlh;
82
83 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
84 cb->nlh->nlmsg_type, sizeof(*r), NLM_F_MULTI);
85 if (!nlh)
86 return -EMSGSIZE;
87
88 r = nlmsg_data(nlh);
89 smc_diag_msg_common_fill(r, sk);
90 r->diag_state = sk->sk_state;
91 if (smc->use_fallback)
92 r->diag_mode = SMC_DIAG_MODE_FALLBACK_TCP;
93 else if (smc_conn_lgr_valid(&smc->conn) && smc->conn.lgr->is_smcd)
94 r->diag_mode = SMC_DIAG_MODE_SMCD;
95 else
96 r->diag_mode = SMC_DIAG_MODE_SMCR;
97 user_ns = sk_user_ns(NETLINK_CB(cb->skb).sk);
98 if (smc_diag_msg_attrs_fill(sk, skb, r, user_ns))
99 goto errout;
100
101 fallback.reason = smc->fallback_rsn;
102 fallback.peer_diagnosis = smc->peer_diagnosis;
103 if (nla_put(skb, SMC_DIAG_FALLBACK, sizeof(fallback), &fallback) < 0)
104 goto errout;
105
106 if ((req->diag_ext & (1 << (SMC_DIAG_CONNINFO - 1))) &&
107 smc->conn.alert_token_local) {
108 struct smc_connection *conn = &smc->conn;
109 struct smc_diag_conninfo cinfo = {
110 .token = conn->alert_token_local,
111 .sndbuf_size = conn->sndbuf_desc ?
112 conn->sndbuf_desc->len : 0,
113 .rmbe_size = conn->rmb_desc ? conn->rmb_desc->len : 0,
114 .peer_rmbe_size = conn->peer_rmbe_size,
115
116 .rx_prod.wrap = conn->local_rx_ctrl.prod.wrap,
117 .rx_prod.count = conn->local_rx_ctrl.prod.count,
118 .rx_cons.wrap = conn->local_rx_ctrl.cons.wrap,
119 .rx_cons.count = conn->local_rx_ctrl.cons.count,
120
121 .tx_prod.wrap = conn->local_tx_ctrl.prod.wrap,
122 .tx_prod.count = conn->local_tx_ctrl.prod.count,
123 .tx_cons.wrap = conn->local_tx_ctrl.cons.wrap,
124 .tx_cons.count = conn->local_tx_ctrl.cons.count,
125
126 .tx_prod_flags =
127 *(u8 *)&conn->local_tx_ctrl.prod_flags,
128 .tx_conn_state_flags =
129 *(u8 *)&conn->local_tx_ctrl.conn_state_flags,
130 .rx_prod_flags = *(u8 *)&conn->local_rx_ctrl.prod_flags,
131 .rx_conn_state_flags =
132 *(u8 *)&conn->local_rx_ctrl.conn_state_flags,
133
134 .tx_prep.wrap = conn->tx_curs_prep.wrap,
135 .tx_prep.count = conn->tx_curs_prep.count,
136 .tx_sent.wrap = conn->tx_curs_sent.wrap,
137 .tx_sent.count = conn->tx_curs_sent.count,
138 .tx_fin.wrap = conn->tx_curs_fin.wrap,
139 .tx_fin.count = conn->tx_curs_fin.count,
140 };
141
142 if (nla_put(skb, SMC_DIAG_CONNINFO, sizeof(cinfo), &cinfo) < 0)
143 goto errout;
144 }
145
146 if (smc_conn_lgr_valid(&smc->conn) && !smc->conn.lgr->is_smcd &&
147 (req->diag_ext & (1 << (SMC_DIAG_LGRINFO - 1))) &&
148 !list_empty(&smc->conn.lgr->list)) {
149 struct smc_link *link = smc->conn.lnk;
150
151 struct smc_diag_lgrinfo linfo = {
152 .role = smc->conn.lgr->role,
153 .lnk[0].ibport = link->ibport,
154 .lnk[0].link_id = link->link_id,
155 };
156
157 memcpy(linfo.lnk[0].ibname, link->smcibdev->ibdev->name,
158 sizeof(link->smcibdev->ibdev->name));
159 smc_gid_be16_convert(linfo.lnk[0].gid, link->gid);
160 smc_gid_be16_convert(linfo.lnk[0].peer_gid, link->peer_gid);
161
162 if (nla_put(skb, SMC_DIAG_LGRINFO, sizeof(linfo), &linfo) < 0)
163 goto errout;
164 }
165 if (smc_conn_lgr_valid(&smc->conn) && smc->conn.lgr->is_smcd &&
166 (req->diag_ext & (1 << (SMC_DIAG_DMBINFO - 1))) &&
167 !list_empty(&smc->conn.lgr->list) && smc->conn.rmb_desc) {
168 struct smc_connection *conn = &smc->conn;
169 struct smcd_diag_dmbinfo dinfo;
170 struct smcd_dev *smcd = conn->lgr->smcd;
171 struct smcd_gid smcd_gid;
172
173 memset(&dinfo, 0, sizeof(dinfo));
174
175 dinfo.linkid = *((u32 *)conn->lgr->id);
176 dinfo.peer_gid = conn->lgr->peer_gid.gid;
177 dinfo.peer_gid_ext = conn->lgr->peer_gid.gid_ext;
178 smcd->ops->get_local_gid(smcd, &smcd_gid);
179 dinfo.my_gid = smcd_gid.gid;
180 dinfo.my_gid_ext = smcd_gid.gid_ext;
181 dinfo.token = conn->rmb_desc->token;
182 dinfo.peer_token = conn->peer_token;
183
184 if (nla_put(skb, SMC_DIAG_DMBINFO, sizeof(dinfo), &dinfo) < 0)
185 goto errout;
186 }
187
188 nlmsg_end(skb, nlh);
189 return 0;
190
191 errout:
192 nlmsg_cancel(skb, nlh);
193 return -EMSGSIZE;
194 }
195
196 static int smc_diag_dump_proto(struct proto *prot, struct sk_buff *skb,
197 struct netlink_callback *cb, int p_type)
198 {
199 struct smc_diag_dump_ctx *cb_ctx = smc_dump_context(cb);
200 struct net *net = sock_net(skb->sk);
201 int snum = cb_ctx->pos[p_type];
202 struct nlattr *bc = NULL;
203 struct hlist_head *head;
204 int rc = 0, num = 0;
205 struct sock *sk;
206
207 read_lock(&prot->h.smc_hash->lock);
208 head = &prot->h.smc_hash->ht;
209 if (hlist_empty(head))
210 goto out;
211
212 sk_for_each(sk, head) {
213 if (!net_eq(sock_net(sk), net))
214 continue;
215 if (num < snum)
216 goto next;
217 rc = __smc_diag_dump(sk, skb, cb, nlmsg_data(cb->nlh), bc);
218 if (rc < 0)
219 goto out;
220 next:
221 num++;
222 }
223
224 out:
225 read_unlock(&prot->h.smc_hash->lock);
226 cb_ctx->pos[p_type] = num;
227 return rc;
228 }
229
230 static int smc_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
231 {
232 int rc = 0;
233
234 rc = smc_diag_dump_proto(&smc_proto, skb, cb, SMCPROTO_SMC);
235 if (!rc)
236 smc_diag_dump_proto(&smc_proto6, skb, cb, SMCPROTO_SMC6);
237 return skb->len;
238 }
239
240 static int smc_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
241 {
242 struct net *net = sock_net(skb->sk);
243
244 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
245 h->nlmsg_flags & NLM_F_DUMP) {
246 {
247 struct netlink_dump_control c = {
248 .dump = smc_diag_dump,
249 .min_dump_alloc = SKB_WITH_OVERHEAD(32768),
250 };
251 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
252 }
253 }
254 return 0;
255 }
256
257 static const struct sock_diag_handler smc_diag_handler = {
258 .owner = THIS_MODULE,
259 .family = AF_SMC,
260 .dump = smc_diag_handler_dump,
261 };
262
263 static int __init smc_diag_init(void)
264 {
265 return sock_diag_register(&smc_diag_handler);
266 }
267
268 static void __exit smc_diag_exit(void)
269 {
270 sock_diag_unregister(&smc_diag_handler);
271 }
272
273 module_init(smc_diag_init);
274 module_exit(smc_diag_exit);
275 MODULE_LICENSE("GPL");
276 MODULE_DESCRIPTION("SMC socket monitoring via SOCK_DIAG");
277 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 43 /* AF_SMC */);
278 MODULE_ALIAS_GENL_FAMILY(SMCR_GENL_FAMILY_NAME);
279
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.