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
25struct smc_diag_dump_ctx {
26 int pos[2];
27};
28
29static struct smc_diag_dump_ctx *smc_dump_context(struct netlink_callback *cb)
30{
31 return (struct smc_diag_dump_ctx *)cb->ctx;
32}
33
34static 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, cookie: 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
59static 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, attrtype: SMC_DIAG_SHUTDOWN, value: sk->sk_shutdown))
64 return 1;
65
66 r->diag_uid = from_kuid_munged(to: user_ns, uid: sock_i_uid(sk));
67 r->diag_inode = sock_i_ino(sk);
68 return 0;
69}
70
71static 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, seq: cb->nlh->nlmsg_seq,
83 type: cb->nlh->nlmsg_type, payload: 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(conn: &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, attrtype: SMC_DIAG_FALLBACK, attrlen: sizeof(fallback), data: &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, attrtype: SMC_DIAG_CONNINFO, attrlen: sizeof(cinfo), data: &cinfo) < 0)
142 goto errout;
143 }
144
145 if (smc_conn_lgr_valid(conn: &smc->conn) && !smc->conn.lgr->is_smcd &&
146 (req->diag_ext & (1 << (SMC_DIAG_LGRINFO - 1))) &&
147 !list_empty(head: &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,
157 smc->conn.lgr->lnk[0].smcibdev->ibdev->name,
158 sizeof(link->smcibdev->ibdev->name));
159 smc_gid_be16_convert(buf: linfo.lnk[0].gid, gid_raw: link->gid);
160 smc_gid_be16_convert(buf: linfo.lnk[0].peer_gid, gid_raw: link->peer_gid);
161
162 if (nla_put(skb, attrtype: SMC_DIAG_LGRINFO, attrlen: sizeof(linfo), data: &linfo) < 0)
163 goto errout;
164 }
165 if (smc_conn_lgr_valid(conn: &smc->conn) && smc->conn.lgr->is_smcd &&
166 (req->diag_ext & (1 << (SMC_DIAG_DMBINFO - 1))) &&
167 !list_empty(head: &smc->conn.lgr->list)) {
168 struct smc_connection *conn = &smc->conn;
169 struct smcd_diag_dmbinfo dinfo;
170 struct smcd_dev *smcd = conn->lgr->smcd;
171
172 memset(&dinfo, 0, sizeof(dinfo));
173
174 dinfo.linkid = *((u32 *)conn->lgr->id);
175 dinfo.peer_gid = conn->lgr->peer_gid;
176 dinfo.my_gid = smcd->ops->get_local_gid(smcd);
177 dinfo.token = conn->rmb_desc->token;
178 dinfo.peer_token = conn->peer_token;
179
180 if (nla_put(skb, attrtype: SMC_DIAG_DMBINFO, attrlen: sizeof(dinfo), data: &dinfo) < 0)
181 goto errout;
182 }
183
184 nlmsg_end(skb, nlh);
185 return 0;
186
187errout:
188 nlmsg_cancel(skb, nlh);
189 return -EMSGSIZE;
190}
191
192static int smc_diag_dump_proto(struct proto *prot, struct sk_buff *skb,
193 struct netlink_callback *cb, int p_type)
194{
195 struct smc_diag_dump_ctx *cb_ctx = smc_dump_context(cb);
196 struct net *net = sock_net(sk: skb->sk);
197 int snum = cb_ctx->pos[p_type];
198 struct nlattr *bc = NULL;
199 struct hlist_head *head;
200 int rc = 0, num = 0;
201 struct sock *sk;
202
203 read_lock(&prot->h.smc_hash->lock);
204 head = &prot->h.smc_hash->ht;
205 if (hlist_empty(h: head))
206 goto out;
207
208 sk_for_each(sk, head) {
209 if (!net_eq(net1: sock_net(sk), net2: net))
210 continue;
211 if (num < snum)
212 goto next;
213 rc = __smc_diag_dump(sk, skb, cb, req: nlmsg_data(nlh: cb->nlh), bc);
214 if (rc < 0)
215 goto out;
216next:
217 num++;
218 }
219
220out:
221 read_unlock(&prot->h.smc_hash->lock);
222 cb_ctx->pos[p_type] = num;
223 return rc;
224}
225
226static int smc_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
227{
228 int rc = 0;
229
230 rc = smc_diag_dump_proto(prot: &smc_proto, skb, cb, SMCPROTO_SMC);
231 if (!rc)
232 smc_diag_dump_proto(prot: &smc_proto6, skb, cb, SMCPROTO_SMC6);
233 return skb->len;
234}
235
236static int smc_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
237{
238 struct net *net = sock_net(sk: skb->sk);
239
240 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
241 h->nlmsg_flags & NLM_F_DUMP) {
242 {
243 struct netlink_dump_control c = {
244 .dump = smc_diag_dump,
245 .min_dump_alloc = SKB_WITH_OVERHEAD(32768),
246 };
247 return netlink_dump_start(ssk: net->diag_nlsk, skb, nlh: h, control: &c);
248 }
249 }
250 return 0;
251}
252
253static const struct sock_diag_handler smc_diag_handler = {
254 .family = AF_SMC,
255 .dump = smc_diag_handler_dump,
256};
257
258static int __init smc_diag_init(void)
259{
260 return sock_diag_register(h: &smc_diag_handler);
261}
262
263static void __exit smc_diag_exit(void)
264{
265 sock_diag_unregister(h: &smc_diag_handler);
266}
267
268module_init(smc_diag_init);
269module_exit(smc_diag_exit);
270MODULE_LICENSE("GPL");
271MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 43 /* AF_SMC */);
272MODULE_ALIAS_GENL_FAMILY(SMCR_GENL_FAMILY_NAME);
273

source code of linux/net/smc/smc_diag.c