X-Git-Url: http://git.ozlabs.org/?p=petitboot;a=blobdiff_plain;f=discover%2Fipmi.c;h=2aaf114c20c5bb248141d01b0c786ff26dcd402e;hp=b8f18301ecc4c75aaccdb0cdc62c84aba898348e;hb=662129afba2d344d692a9dbfd430c91eff4f281d;hpb=f69fabee4a120cebaeff2359350e62bd960088f4

diff --git a/discover/ipmi.c b/discover/ipmi.c
index b8f1830..2aaf114 100644
--- a/discover/ipmi.c
+++ b/discover/ipmi.c
@@ -1,6 +1,29 @@
 
+#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) {
@@ -16,8 +39,284 @@ bool ipmi_bootdev_is_valid(int x)
 	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 false;
+	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 */
+int 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 -1;
+	}
+
+	/* 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 -1;
+	}
+
+	/* 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 -1;
+	}
+
+	/* 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 -1;
+	}
+
+	/* 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 -1;
+		}
+
+		/* 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 -1;
+		}
+		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 -1;
+		}
+		ifconf->static_config.gateway = gatewaystr;
+		i += ipsize;
+	}
+
+	ifconf->override = true;
+	pb_log("Applying IPMI network interface override\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;
+
+	return 0;
+}