summaryrefslogtreecommitdiffstats
path: root/discover/ipmi.c
blob: e52070ffe4c8a78930a519b3e7f1664923eecfa3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319

#include <errno.h>
#include <fcntl.h>
#include <poll.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>

#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/types.h>

#include <linux/ipmi.h>

#include <log/log.h>
#include <talloc/talloc.h>

#include "ipmi.h"

struct ipmi {
	int	fd;
	long	seq;
};

static const char *ipmi_devnode = "/dev/ipmi0";

bool ipmi_bootdev_is_valid(int x)
{
	switch (x) {
	case IPMI_BOOTDEV_NONE:
	case IPMI_BOOTDEV_NETWORK:
	case IPMI_BOOTDEV_DISK:
	case IPMI_BOOTDEV_SAFE:
	case IPMI_BOOTDEV_CDROM:
	case IPMI_BOOTDEV_SETUP:
		return true;
	}

	return false;
}

static int ipmi_send(struct ipmi *ipmi, uint8_t netfn, uint8_t cmd,
		uint8_t *buf, uint16_t len)
{
	struct ipmi_system_interface_addr addr;
	struct ipmi_req req;
	int rc;

	memset(&addr, 0, sizeof(addr));
	addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
	addr.channel = IPMI_BMC_CHANNEL;

	memset(&req, 0, sizeof(req));
	req.addr = (unsigned char *)&addr;
	req.addr_len = sizeof(addr);

	req.msgid = ipmi->seq++;

	req.msg.data = buf;
	req.msg.data_len = len;
	req.msg.netfn = netfn;
	req.msg.cmd = cmd;

	rc = ioctl(ipmi->fd, IPMICTL_SEND_COMMAND, &req);
	if (rc < 0) {
		pb_log("IPMI: send (netfn %d, cmd %d, %d bytes) failed: %m\n",
				netfn, cmd, len);
		return -1;
	}

	return 0;
}

static int ipmi_recv(struct ipmi *ipmi, uint8_t *netfn, uint8_t *cmd,
		long *seq, uint8_t *buf, uint16_t *len)
{
	struct ipmi_recv recv;
	struct ipmi_addr addr;
	int rc;

	recv.addr = (unsigned char *)&addr;
	recv.addr_len = sizeof(addr);
	recv.msg.data = buf;
	recv.msg.data_len = *len;

	rc = ioctl(ipmi->fd, IPMICTL_RECEIVE_MSG_TRUNC, &recv);
	if (rc < 0 && errno != EMSGSIZE) {
		pb_log("IPMI: recv (%d bytes) failed: %m\n", *len);
		return -1;
	} else if (rc < 0 && errno == EMSGSIZE) {
		pb_debug("IPMI: truncated message (netfn %d, cmd %d, "
				"size %d), continuing anyway\n",
				recv.msg.netfn, recv.msg.cmd, *len);
	}

	*netfn = recv.msg.netfn;
	*cmd = recv.msg.cmd;
	*seq = recv.msgid;
	*len = recv.msg.data_len;

	return 0;
}

int ipmi_transaction(struct ipmi *ipmi, uint8_t netfn, uint8_t cmd,
		uint8_t *req_buf, uint16_t req_len,
		uint8_t *resp_buf, uint16_t *resp_len,
		int timeout_ms)
{
	struct timeval start, now, delta;
	struct pollfd pollfds[1];
	struct flock lock;
	int expired_ms, rc;

	memset(&lock, 0, sizeof(lock));
	lock.l_type = F_WRLCK;
	lock.l_whence = SEEK_SET;
	rc = fcntl(ipmi->fd, F_SETLKW, &lock);
	if (rc == -1) {
		pb_log("IPMI: error locking IPMI device: %m\n");
		return rc;
	}

	rc = ipmi_send(ipmi, netfn, cmd, req_buf, req_len);
	if (rc)
		goto out;

	pollfds[0].fd = ipmi->fd;
	pollfds[0].events = POLLIN;

	gettimeofday(&start, NULL);
	expired_ms = 0;

	for (;;) {
		uint8_t resp_netfn, resp_cmd;
		long seq;

		rc = poll(pollfds, 1, timeout_ms - expired_ms);

		if (rc < 0) {
			pb_log("IPMI: poll() error %m");
			break;
		}
		if (rc == 0) {
			pb_log("IPMI: timeout waiting for response "
					"(netfn %d, cmd %d)\n", netfn, cmd);
			rc = -1;
			break;
		}

		if (!(pollfds[0].revents & POLLIN)) {
			pb_log("IPMI: unexpected fd status from poll?\n");
			rc = -1;
			break;
		}

		rc = ipmi_recv(ipmi, &resp_netfn, &resp_cmd, &seq,
				resp_buf, resp_len);
		if (rc)
			break;

		if (seq != ipmi->seq - 1) {
			pb_log("IPMI: out-of-sequence reply: "
					"exp %ld, got %ld\n",
					ipmi->seq, seq);

			if (timeout_ms) {
				gettimeofday(&now, NULL);
				timersub(&now, &start, &delta);
				expired_ms = (delta.tv_sec * 1000) +
						(delta.tv_usec / 1000);

				if (expired_ms >= timeout_ms) {
					rc = -1;
					break;
				}
			}
		} else {
			pb_debug("IPMI: netfn(%x->%x), cmd(%x->%x)\n",
					netfn, resp_netfn, cmd, resp_cmd);
			rc = 0;
			goto out;
		}
	}

out:
	lock.l_type = F_UNLCK;
	if (fcntl(ipmi->fd, F_SETLKW, &lock) == -1)
		pb_log("IPMI: error unlocking IPMI device: %m\n");
	return rc ? -1 : 0;
}

static int ipmi_destroy(void *p)
{
	struct ipmi *ipmi = p;
	close(ipmi->fd);
	return 1;
}

struct ipmi *ipmi_open(void *ctx)
{
	struct ipmi *ipmi;
	int fd;

	fd = open(ipmi_devnode, O_RDWR);
	if (fd < 0) {
		pb_log("IPMI: can't open IPMI device %s: %m\n", ipmi_devnode);
		return NULL;
	}

	ipmi = talloc(ctx, struct ipmi);
	ipmi->fd = fd;
	ipmi->seq = 0;

	talloc_set_destructor(ipmi, ipmi_destroy);

	return ipmi;
}

bool ipmi_present(void)
{
	return !access(ipmi_devnode, R_OK | W_OK);
}

/* Reads and applies an IPMI interface config override, which closely follows
 * the format of an interface config struct as described in lib/types */
void parse_ipmi_interface_override(struct config *config, uint8_t *buf,
				uint16_t len)
{
	struct interface_config *ifconf;
	char *ipstr, *gatewaystr;
	uint8_t hwsize, ipsize;
	int addr_type, i = 0;
	socklen_t addr_len;

	/* Get 1-byte hardware address size and ip address size */
	memcpy(&hwsize, &buf[i], sizeof(hwsize));
	i += sizeof(hwsize);
	memcpy(&ipsize, &buf[i], sizeof(ipsize));
	i += sizeof(ipsize);

	if (!hwsize || !ipsize) {
		pb_log("%s: Empty response\n", __func__);
		return;
	}

	/* At the moment only support 6-byte MAC addresses */
	if (hwsize != sizeof(ifconf->hwaddr)) {
		pb_log("Unsupported HW address size in network override: %u\n",
		       hwsize);
		return;
	}

	/* Sanity check the IP address size */
	if (ipsize == 4) {
		addr_type = AF_INET;
		addr_len = INET_ADDRSTRLEN;
	} else if (ipsize == 16) {
		addr_type = AF_INET6;
		addr_len = INET6_ADDRSTRLEN;
	} else {
		pb_log("Unsupported IP address size: %u\n", ipsize);
		return;
	}

	/* Everything past here is the interface config */
	ifconf = talloc_zero(config, struct interface_config);
	if (!ifconf) {
		pb_log("Failed to allocate network override\n");
		return;
	}

	/* Hardware Address */
	memcpy(ifconf->hwaddr, &buf[i], hwsize);
	i += hwsize;

	/* Check 1-byte ignore and method flags */
	ifconf->ignore = !!buf[i++];
	ifconf->method = !!buf[i++];

	if (ifconf->method == CONFIG_METHOD_STATIC) {
		if (ipsize + ipsize  + 1 > len - i) {
			pb_log("Expected data greater than buffer size\n");
			talloc_free(ifconf);
			return;
		}

		/* IP address */
		ipstr = talloc_array(ifconf, char, addr_len);
		if (!inet_ntop(addr_type, &buf[i], ipstr, addr_len)) {
			pb_log("Failed to convert ipaddr: %m\n");
			talloc_free(ifconf);
			return;
		}
		i += ipsize;

		/* IP address subnet */
		ifconf->static_config.address = talloc_asprintf(ifconf,
						"%s/%u", ipstr, buf[i]);
		i++;

		/* Gateway address */
		gatewaystr = talloc_array(ifconf, char, addr_len);
		if (!inet_ntop(addr_type, &buf[i], gatewaystr, addr_len)) {
			pb_log("Failed to convert gateway: %m\n");
			talloc_free(ifconf);
			return;
		}
		ifconf->static_config.gateway = gatewaystr;
		i += ipsize;
	}

	pb_log("Applying IPMI network config\n");

	/* Replace any existing interface config */
	talloc_free(config->network.interfaces);
	config->network.n_interfaces = 1;
	config->network.interfaces = talloc(config, struct interface_config *);
	config->network.interfaces[0] = ifconf;
}
OpenPOWER on IntegriCloud