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