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
smc_gid_be16_convert(__u8 * buf,u8 * gid_raw)25 static void smc_gid_be16_convert(__u8 *buf, u8 *gid_raw)
26 {
27 sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x",
28 be16_to_cpu(((__be16 *)gid_raw)[0]),
29 be16_to_cpu(((__be16 *)gid_raw)[1]),
30 be16_to_cpu(((__be16 *)gid_raw)[2]),
31 be16_to_cpu(((__be16 *)gid_raw)[3]),
32 be16_to_cpu(((__be16 *)gid_raw)[4]),
33 be16_to_cpu(((__be16 *)gid_raw)[5]),
34 be16_to_cpu(((__be16 *)gid_raw)[6]),
35 be16_to_cpu(((__be16 *)gid_raw)[7]));
36 }
37
smc_diag_msg_common_fill(struct smc_diag_msg * r,struct sock * sk)38 static void smc_diag_msg_common_fill(struct smc_diag_msg *r, struct sock *sk)
39 {
40 struct smc_sock *smc = smc_sk(sk);
41
42 r->diag_family = sk->sk_family;
43 if (!smc->clcsock)
44 return;
45 r->id.idiag_sport = htons(smc->clcsock->sk->sk_num);
46 r->id.idiag_dport = smc->clcsock->sk->sk_dport;
47 r->id.idiag_if = smc->clcsock->sk->sk_bound_dev_if;
48 sock_diag_save_cookie(sk, r->id.idiag_cookie);
49 if (sk->sk_protocol == SMCPROTO_SMC) {
50 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
51 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
52 r->id.idiag_src[0] = smc->clcsock->sk->sk_rcv_saddr;
53 r->id.idiag_dst[0] = smc->clcsock->sk->sk_daddr;
54 #if IS_ENABLED(CONFIG_IPV6)
55 } else if (sk->sk_protocol == SMCPROTO_SMC6) {
56 memcpy(&r->id.idiag_src, &smc->clcsock->sk->sk_v6_rcv_saddr,
57 sizeof(smc->clcsock->sk->sk_v6_rcv_saddr));
58 memcpy(&r->id.idiag_dst, &smc->clcsock->sk->sk_v6_daddr,
59 sizeof(smc->clcsock->sk->sk_v6_daddr));
60 #endif
61 }
62 }
63
smc_diag_msg_attrs_fill(struct sock * sk,struct sk_buff * skb,struct smc_diag_msg * r,struct user_namespace * user_ns)64 static int smc_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
65 struct smc_diag_msg *r,
66 struct user_namespace *user_ns)
67 {
68 if (nla_put_u8(skb, SMC_DIAG_SHUTDOWN, sk->sk_shutdown))
69 return 1;
70
71 r->diag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
72 r->diag_inode = sock_i_ino(sk);
73 return 0;
74 }
75
__smc_diag_dump(struct sock * sk,struct sk_buff * skb,struct netlink_callback * cb,const struct smc_diag_req * req,struct nlattr * bc)76 static int __smc_diag_dump(struct sock *sk, struct sk_buff *skb,
77 struct netlink_callback *cb,
78 const struct smc_diag_req *req,
79 struct nlattr *bc)
80 {
81 struct smc_sock *smc = smc_sk(sk);
82 struct smc_diag_fallback fallback;
83 struct user_namespace *user_ns;
84 struct smc_diag_msg *r;
85 struct nlmsghdr *nlh;
86
87 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
88 cb->nlh->nlmsg_type, sizeof(*r), NLM_F_MULTI);
89 if (!nlh)
90 return -EMSGSIZE;
91
92 r = nlmsg_data(nlh);
93 smc_diag_msg_common_fill(r, sk);
94 r->diag_state = sk->sk_state;
95 if (smc->use_fallback)
96 r->diag_mode = SMC_DIAG_MODE_FALLBACK_TCP;
97 else if (smc->conn.lgr && smc->conn.lgr->is_smcd)
98 r->diag_mode = SMC_DIAG_MODE_SMCD;
99 else
100 r->diag_mode = SMC_DIAG_MODE_SMCR;
101 user_ns = sk_user_ns(NETLINK_CB(cb->skb).sk);
102 if (smc_diag_msg_attrs_fill(sk, skb, r, user_ns))
103 goto errout;
104
105 fallback.reason = smc->fallback_rsn;
106 fallback.peer_diagnosis = smc->peer_diagnosis;
107 if (nla_put(skb, SMC_DIAG_FALLBACK, sizeof(fallback), &fallback) < 0)
108 goto errout;
109
110 if ((req->diag_ext & (1 << (SMC_DIAG_CONNINFO - 1))) &&
111 smc->conn.alert_token_local) {
112 struct smc_connection *conn = &smc->conn;
113 struct smc_diag_conninfo cinfo = {
114 .token = conn->alert_token_local,
115 .sndbuf_size = conn->sndbuf_desc ?
116 conn->sndbuf_desc->len : 0,
117 .rmbe_size = conn->rmb_desc ? conn->rmb_desc->len : 0,
118 .peer_rmbe_size = conn->peer_rmbe_size,
119
120 .rx_prod.wrap = conn->local_rx_ctrl.prod.wrap,
121 .rx_prod.count = conn->local_rx_ctrl.prod.count,
122 .rx_cons.wrap = conn->local_rx_ctrl.cons.wrap,
123 .rx_cons.count = conn->local_rx_ctrl.cons.count,
124
125 .tx_prod.wrap = conn->local_tx_ctrl.prod.wrap,
126 .tx_prod.count = conn->local_tx_ctrl.prod.count,
127 .tx_cons.wrap = conn->local_tx_ctrl.cons.wrap,
128 .tx_cons.count = conn->local_tx_ctrl.cons.count,
129
130 .tx_prod_flags =
131 *(u8 *)&conn->local_tx_ctrl.prod_flags,
132 .tx_conn_state_flags =
133 *(u8 *)&conn->local_tx_ctrl.conn_state_flags,
134 .rx_prod_flags = *(u8 *)&conn->local_rx_ctrl.prod_flags,
135 .rx_conn_state_flags =
136 *(u8 *)&conn->local_rx_ctrl.conn_state_flags,
137
138 .tx_prep.wrap = conn->tx_curs_prep.wrap,
139 .tx_prep.count = conn->tx_curs_prep.count,
140 .tx_sent.wrap = conn->tx_curs_sent.wrap,
141 .tx_sent.count = conn->tx_curs_sent.count,
142 .tx_fin.wrap = conn->tx_curs_fin.wrap,
143 .tx_fin.count = conn->tx_curs_fin.count,
144 };
145
146 if (nla_put(skb, SMC_DIAG_CONNINFO, sizeof(cinfo), &cinfo) < 0)
147 goto errout;
148 }
149
150 if (smc->conn.lgr && !smc->conn.lgr->is_smcd &&
151 (req->diag_ext & (1 << (SMC_DIAG_LGRINFO - 1))) &&
152 !list_empty(&smc->conn.lgr->list)) {
153 struct smc_diag_lgrinfo linfo = {
154 .role = smc->conn.lgr->role,
155 .lnk[0].ibport = smc->conn.lgr->lnk[0].ibport,
156 .lnk[0].link_id = smc->conn.lgr->lnk[0].link_id,
157 };
158
159 memcpy(linfo.lnk[0].ibname,
160 smc->conn.lgr->lnk[0].smcibdev->ibdev->name,
161 sizeof(smc->conn.lgr->lnk[0].smcibdev->ibdev->name));
162 smc_gid_be16_convert(linfo.lnk[0].gid,
163 smc->conn.lgr->lnk[0].gid);
164 smc_gid_be16_convert(linfo.lnk[0].peer_gid,
165 smc->conn.lgr->lnk[0].peer_gid);
166
167 if (nla_put(skb, SMC_DIAG_LGRINFO, sizeof(linfo), &linfo) < 0)
168 goto errout;
169 }
170 if (smc->conn.lgr && smc->conn.lgr->is_smcd &&
171 (req->diag_ext & (1 << (SMC_DIAG_DMBINFO - 1))) &&
172 !list_empty(&smc->conn.lgr->list)) {
173 struct smc_connection *conn = &smc->conn;
174 struct smcd_diag_dmbinfo dinfo = {
175 .linkid = *((u32 *)conn->lgr->id),
176 .peer_gid = conn->lgr->peer_gid,
177 .my_gid = conn->lgr->smcd->local_gid,
178 .token = conn->rmb_desc->token,
179 .peer_token = conn->peer_token
180 };
181
182 if (nla_put(skb, SMC_DIAG_DMBINFO, sizeof(dinfo), &dinfo) < 0)
183 goto errout;
184 }
185
186 nlmsg_end(skb, nlh);
187 return 0;
188
189 errout:
190 nlmsg_cancel(skb, nlh);
191 return -EMSGSIZE;
192 }
193
smc_diag_dump_proto(struct proto * prot,struct sk_buff * skb,struct netlink_callback * cb)194 static int smc_diag_dump_proto(struct proto *prot, struct sk_buff *skb,
195 struct netlink_callback *cb)
196 {
197 struct net *net = sock_net(skb->sk);
198 struct nlattr *bc = NULL;
199 struct hlist_head *head;
200 struct sock *sk;
201 int rc = 0;
202
203 read_lock(&prot->h.smc_hash->lock);
204 head = &prot->h.smc_hash->ht;
205 if (hlist_empty(head))
206 goto out;
207
208 sk_for_each(sk, head) {
209 if (!net_eq(sock_net(sk), net))
210 continue;
211 rc = __smc_diag_dump(sk, skb, cb, nlmsg_data(cb->nlh), bc);
212 if (rc)
213 break;
214 }
215
216 out:
217 read_unlock(&prot->h.smc_hash->lock);
218 return rc;
219 }
220
smc_diag_dump(struct sk_buff * skb,struct netlink_callback * cb)221 static int smc_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
222 {
223 int rc = 0;
224
225 rc = smc_diag_dump_proto(&smc_proto, skb, cb);
226 if (!rc)
227 rc = smc_diag_dump_proto(&smc_proto6, skb, cb);
228 return rc;
229 }
230
smc_diag_handler_dump(struct sk_buff * skb,struct nlmsghdr * h)231 static int smc_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
232 {
233 struct net *net = sock_net(skb->sk);
234
235 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
236 h->nlmsg_flags & NLM_F_DUMP) {
237 {
238 struct netlink_dump_control c = {
239 .dump = smc_diag_dump,
240 .min_dump_alloc = SKB_WITH_OVERHEAD(32768),
241 };
242 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
243 }
244 }
245 return 0;
246 }
247
248 static const struct sock_diag_handler smc_diag_handler = {
249 .family = AF_SMC,
250 .dump = smc_diag_handler_dump,
251 };
252
smc_diag_init(void)253 static int __init smc_diag_init(void)
254 {
255 return sock_diag_register(&smc_diag_handler);
256 }
257
smc_diag_exit(void)258 static void __exit smc_diag_exit(void)
259 {
260 sock_diag_unregister(&smc_diag_handler);
261 }
262
263 module_init(smc_diag_init);
264 module_exit(smc_diag_exit);
265 MODULE_LICENSE("GPL");
266 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 43 /* AF_SMC */);
267
