Merge tag 'fs_for_v5.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack...
[linux-2.6-microblaze.git] / net / smc / smc_diag.c
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
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
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
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
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 && 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 && !smc->conn.lgr->is_smcd &&
146             (req->diag_ext & (1 << (SMC_DIAG_LGRINFO - 1))) &&
147             !list_empty(&smc->conn.lgr->list)) {
148                 struct smc_diag_lgrinfo linfo = {
149                         .role = smc->conn.lgr->role,
150                         .lnk[0].ibport = smc->conn.lnk->ibport,
151                         .lnk[0].link_id = smc->conn.lnk->link_id,
152                 };
153
154                 memcpy(linfo.lnk[0].ibname,
155                        smc->conn.lgr->lnk[0].smcibdev->ibdev->name,
156                        sizeof(smc->conn.lnk->smcibdev->ibdev->name));
157                 smc_gid_be16_convert(linfo.lnk[0].gid,
158                                      smc->conn.lnk->gid);
159                 smc_gid_be16_convert(linfo.lnk[0].peer_gid,
160                                      smc->conn.lnk->peer_gid);
161
162                 if (nla_put(skb, SMC_DIAG_LGRINFO, sizeof(linfo), &linfo) < 0)
163                         goto errout;
164         }
165         if (smc->conn.lgr && smc->conn.lgr->is_smcd &&
166             (req->diag_ext & (1 << (SMC_DIAG_DMBINFO - 1))) &&
167             !list_empty(&smc->conn.lgr->list)) {
168                 struct smc_connection *conn = &smc->conn;
169                 struct smcd_diag_dmbinfo dinfo;
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 = conn->lgr->smcd->local_gid;
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
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
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
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
257 static int __init smc_diag_init(void)
258 {
259         return sock_diag_register(&smc_diag_handler);
260 }
261
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 */);