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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
25static 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
38static 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
63static 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
75static 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)) {
172 struct smc_connection *conn = &smc->conn;
173 struct smcd_diag_dmbinfo dinfo = {
174 .linkid = *((u32 *)conn->lgr->id),
175 .peer_gid = conn->lgr->peer_gid,
176 .my_gid = conn->lgr->smcd->local_gid,
177 .token = conn->rmb_desc->token,
178 .peer_token = conn->peer_token
179 };
180
181 if (nla_put(skb, SMC_DIAG_DMBINFO, sizeof(dinfo), &dinfo) < 0)
182 goto errout;
183 }
184
185 nlmsg_end(skb, nlh);
186 return 0;
187
188errout:
189 nlmsg_cancel(skb, nlh);
190 return -EMSGSIZE;
191}
192
193static int smc_diag_dump_proto(struct proto *prot, struct sk_buff *skb,
194 struct netlink_callback *cb)
195{
196 struct net *net = sock_net(skb->sk);
197 struct nlattr *bc = NULL;
198 struct hlist_head *head;
199 struct sock *sk;
200 int rc = 0;
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 rc = __smc_diag_dump(sk, skb, cb, nlmsg_data(cb->nlh), bc);
211 if (rc)
212 break;
213 }
214
215out:
216 read_unlock(&prot->h.smc_hash->lock);
217 return rc;
218}
219
220static int smc_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
221{
222 int rc = 0;
223
224 rc = smc_diag_dump_proto(&smc_proto, skb, cb);
225 if (!rc)
226 rc = smc_diag_dump_proto(&smc_proto6, skb, cb);
227 return rc;
228}
229
230static int smc_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
231{
232 struct net *net = sock_net(skb->sk);
233
234 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
235 h->nlmsg_flags & NLM_F_DUMP) {
236 {
237 struct netlink_dump_control c = {
238 .dump = smc_diag_dump,
239 .min_dump_alloc = SKB_WITH_OVERHEAD(32768),
240 };
241 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
242 }
243 }
244 return 0;
245}
246
247static const struct sock_diag_handler smc_diag_handler = {
248 .family = AF_SMC,
249 .dump = smc_diag_handler_dump,
250};
251
252static int __init smc_diag_init(void)
253{
254 return sock_diag_register(&smc_diag_handler);
255}
256
257static void __exit smc_diag_exit(void)
258{
259 sock_diag_unregister(&smc_diag_handler);
260}
261
262module_init(smc_diag_init);
263module_exit(smc_diag_exit);
264MODULE_LICENSE("GPL");
265MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 43
266
