1 files changed, 686 insertions, 0 deletions

diff --git a/package/swconfig/src/swlib.c b/package/swconfig/src/swlib.c
new file mode 100644
index 000000000..de08717e3
--- /dev/null
+++ b/package/swconfig/src/swlib.c
@@ -0,0 +1,686 @@
+/*
+ * swlib.c: Switch configuration API (user space part)
+ *
+ * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * version 2.1 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <inttypes.h>
+#include <errno.h>
+#include <stdint.h>
+#include <getopt.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <linux/switch.h>
+#include "swlib.h"
+#include <netlink/netlink.h>
+#include <netlink/genl/genl.h>
+#include <netlink/genl/family.h>
+
+//#define DEBUG 1
+#ifdef DEBUG
+#define DPRINTF(fmt, ...) fprintf(stderr, "%s(%d): " fmt, __func__, __LINE__, ##__VA_ARGS__)
+#else
+#define DPRINTF(fmt, ...) do {} while (0)
+#endif
+
+static struct nl_sock *handle;
+static struct nl_cache *cache;
+static struct genl_family *family;
+static struct nlattr *tb[SWITCH_ATTR_MAX + 1];
+static int refcount = 0;
+
+static struct nla_policy port_policy[] = {
+	[SWITCH_PORT_ID] = { .type = NLA_U32 },
+	[SWITCH_PORT_FLAG_TAGGED] = { .type = NLA_FLAG },
+};
+
+static inline void *
+swlib_alloc(size_t size)
+{
+	void *ptr;
+
+	ptr = malloc(size);
+	if (!ptr)
+		goto done;
+	memset(ptr, 0, size);
+
+done:
+	return ptr;
+}
+
+static int
+wait_handler(struct nl_msg *msg, void *arg)
+{
+	int *finished = arg;
+
+	*finished = 1;
+	return NL_STOP;
+}
+
+/* helper function for performing netlink requests */
+static int
+swlib_call(int cmd, int (*call)(struct nl_msg *, void *),
+		int (*data)(struct nl_msg *, void *), void *arg)
+{
+	struct nl_msg *msg;
+	struct nl_cb *cb = NULL;
+	int finished;
+	int flags = 0;
+	int err;
+
+	msg = nlmsg_alloc();
+	if (!msg) {
+		fprintf(stderr, "Out of memory!\n");
+		exit(1);
+	}
+
+	if (!data)
+		flags |= NLM_F_DUMP;
+
+	genlmsg_put(msg, NL_AUTO_PID, NL_AUTO_SEQ, genl_family_get_id(family), 0, flags, cmd, 0);
+	if (data) {
+		if (data(msg, arg) < 0)
+			goto nla_put_failure;
+	}
+
+	cb = nl_cb_alloc(NL_CB_CUSTOM);
+	if (!cb) {
+		fprintf(stderr, "nl_cb_alloc failed.\n");
+		exit(1);
+	}
+
+	err = nl_send_auto_complete(handle, msg);
+	if (err < 0) {
+		fprintf(stderr, "nl_send_auto_complete failed: %d\n", err);
+		goto out;
+	}
+
+	finished = 0;
+
+	if (call)
+		nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, call, arg);
+
+	if (data)
+		nl_cb_set(cb, NL_CB_ACK, NL_CB_CUSTOM, wait_handler, &finished);
+	else
+		nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, wait_handler, &finished);
+
+	err = nl_recvmsgs(handle, cb);
+	if (err < 0) {
+		goto out;
+	}
+
+	if (!finished)
+		err = nl_wait_for_ack(handle);
+
+out:
+	if (cb)
+		nl_cb_put(cb);
+nla_put_failure:
+	nlmsg_free(msg);
+	return err;
+}
+
+static int
+send_attr(struct nl_msg *msg, void *arg)
+{
+	struct switch_val *val = arg;
+	struct switch_attr *attr = val->attr;
+
+	NLA_PUT_U32(msg, SWITCH_ATTR_ID, attr->dev->id);
+	NLA_PUT_U32(msg, SWITCH_ATTR_OP_ID, attr->id);
+	switch(attr->atype) {
+	case SWLIB_ATTR_GROUP_PORT:
+		NLA_PUT_U32(msg, SWITCH_ATTR_OP_PORT, val->port_vlan);
+		break;
+	case SWLIB_ATTR_GROUP_VLAN:
+		NLA_PUT_U32(msg, SWITCH_ATTR_OP_VLAN, val->port_vlan);
+		break;
+	default:
+		break;
+	}
+
+	return 0;
+
+nla_put_failure:
+	return -1;
+}
+
+static int
+store_port_val(struct nl_msg *msg, struct nlattr *nla, struct switch_val *val)
+{
+	struct nlattr *p;
+	int ports = val->attr->dev->ports;
+	int err = 0;
+	int remaining;
+
+	if (!val->value.ports)
+		val->value.ports = malloc(sizeof(struct switch_port) * ports);
+
+	nla_for_each_nested(p, nla, remaining) {
+		struct nlattr *tb[SWITCH_PORT_ATTR_MAX+1];
+		struct switch_port *port;
+
+		if (val->len >= ports)
+			break;
+
+		err = nla_parse_nested(tb, SWITCH_PORT_ATTR_MAX, p, port_policy);
+		if (err < 0)
+			goto out;
+
+		if (!tb[SWITCH_PORT_ID])
+			continue;
+
+		port = &val->value.ports[val->len];
+		port->id = nla_get_u32(tb[SWITCH_PORT_ID]);
+		port->flags = 0;
+		if (tb[SWITCH_PORT_FLAG_TAGGED])
+			port->flags |= SWLIB_PORT_FLAG_TAGGED;
+
+		val->len++;
+	}
+
+out:
+	return err;
+}
+
+static int
+store_val(struct nl_msg *msg, void *arg)
+{
+	struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
+	struct switch_val *val = arg;
+	struct switch_attr *attr = val->attr;
+
+	if (!val)
+		goto error;
+
+	if (nla_parse(tb, SWITCH_ATTR_MAX - 1, genlmsg_attrdata(gnlh, 0),
+			genlmsg_attrlen(gnlh, 0), NULL) < 0) {
+		goto error;
+	}
+
+	if (tb[SWITCH_ATTR_OP_VALUE_INT])
+		val->value.i = nla_get_u32(tb[SWITCH_ATTR_OP_VALUE_INT]);
+	else if (tb[SWITCH_ATTR_OP_VALUE_STR])
+		val->value.s = strdup(nla_get_string(tb[SWITCH_ATTR_OP_VALUE_STR]));
+	else if (tb[SWITCH_ATTR_OP_VALUE_PORTS])
+		val->err = store_port_val(msg, tb[SWITCH_ATTR_OP_VALUE_PORTS], val);
+
+	val->err = 0;
+	return 0;
+
+error:
+	return NL_SKIP;
+}
+
+int
+swlib_get_attr(struct switch_dev *dev, struct switch_attr *attr, struct switch_val *val)
+{
+	int cmd;
+	int err;
+
+	switch(attr->atype) {
+	case SWLIB_ATTR_GROUP_GLOBAL:
+		cmd = SWITCH_CMD_GET_GLOBAL;
+		break;
+	case SWLIB_ATTR_GROUP_PORT:
+		cmd = SWITCH_CMD_GET_PORT;
+		break;
+	case SWLIB_ATTR_GROUP_VLAN:
+		cmd = SWITCH_CMD_GET_VLAN;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	memset(&val->value, 0, sizeof(val->value));
+	val->len = 0;
+	val->attr = attr;
+	val->err = -EINVAL;
+	err = swlib_call(cmd, store_val, send_attr, val);
+	if (!err)
+		err = val->err;
+
+	return err;
+}
+
+static int
+send_attr_ports(struct nl_msg *msg, struct switch_val *val)
+{
+	struct nlattr *n;
+	int i;
+
+	/* TODO implement multipart? */
+	if (val->len == 0)
+		goto done;
+	n = nla_nest_start(msg, SWITCH_ATTR_OP_VALUE_PORTS);
+	if (!n)
+		goto nla_put_failure;
+	for (i = 0; i < val->len; i++) {
+		struct switch_port *port = &val->value.ports[i];
+		struct nlattr *np;
+
+		np = nla_nest_start(msg, SWITCH_ATTR_PORT);
+		if (!np)
+			goto nla_put_failure;
+
+		NLA_PUT_U32(msg, SWITCH_PORT_ID, port->id);
+		if (port->flags & SWLIB_PORT_FLAG_TAGGED)
+			NLA_PUT_FLAG(msg, SWITCH_PORT_FLAG_TAGGED);
+
+		nla_nest_end(msg, np);
+	}
+	nla_nest_end(msg, n);
+done:
+	return 0;
+
+nla_put_failure:
+	return -1;
+}
+
+static int
+send_attr_val(struct nl_msg *msg, void *arg)
+{
+	struct switch_val *val = arg;
+	struct switch_attr *attr = val->attr;
+
+	if (send_attr(msg, arg))
+		goto nla_put_failure;
+
+	switch(attr->type) {
+	case SWITCH_TYPE_NOVAL:
+		break;
+	case SWITCH_TYPE_INT:
+		NLA_PUT_U32(msg, SWITCH_ATTR_OP_VALUE_INT, val->value.i);
+		break;
+	case SWITCH_TYPE_STRING:
+		if (!val->value.s)
+			goto nla_put_failure;
+		NLA_PUT_STRING(msg, SWITCH_ATTR_OP_VALUE_STR, val->value.s);
+		break;
+	case SWITCH_TYPE_PORTS:
+		if (send_attr_ports(msg, val) < 0)
+			goto nla_put_failure;
+		break;
+	default:
+		goto nla_put_failure;
+	}
+	return 0;
+
+nla_put_failure:
+	return -1;
+}
+
+int
+swlib_set_attr(struct switch_dev *dev, struct switch_attr *attr, struct switch_val *val)
+{
+	int cmd;
+
+	switch(attr->atype) {
+	case SWLIB_ATTR_GROUP_GLOBAL:
+		cmd = SWITCH_CMD_SET_GLOBAL;
+		break;
+	case SWLIB_ATTR_GROUP_PORT:
+		cmd = SWITCH_CMD_SET_PORT;
+		break;
+	case SWLIB_ATTR_GROUP_VLAN:
+		cmd = SWITCH_CMD_SET_VLAN;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	val->attr = attr;
+	return swlib_call(cmd, NULL, send_attr_val, val);
+}
+
+int swlib_set_attr_string(struct switch_dev *dev, struct switch_attr *a, int port_vlan, const char *str)
+{
+	struct switch_port *ports;
+	struct switch_val val;
+	char *ptr;
+
+	memset(&val, 0, sizeof(val));
+	val.port_vlan = port_vlan;
+	switch(a->type) {
+	case SWITCH_TYPE_INT:
+		val.value.i = atoi(str);
+		break;
+	case SWITCH_TYPE_STRING:
+		val.value.s = str;
+		break;
+	case SWITCH_TYPE_PORTS:
+		ports = alloca(sizeof(struct switch_port) * dev->ports);
+		memset(ports, 0, sizeof(struct switch_port) * dev->ports);
+		val.len = 0;
+		ptr = (char *)str;
+		while(ptr && *ptr)
+		{
+			while(*ptr && isspace(*ptr))
+				ptr++;
+
+			if (!*ptr)
+				break;
+
+			if (!isdigit(*ptr))
+				return -1;
+
+			if (val.len >= dev->ports)
+				return -1;
+
+			ports[val.len].flags = 0;
+			ports[val.len].id = strtoul(ptr, &ptr, 10);
+			while(*ptr && !isspace(*ptr)) {
+				if (*ptr == 't')
+					ports[val.len].flags |= SWLIB_PORT_FLAG_TAGGED;
+				else
+					return -1;
+
+				ptr++;
+			}
+			if (*ptr)
+				ptr++;
+			val.len++;
+		}
+		val.value.ports = ports;
+		break;
+	case SWITCH_TYPE_NOVAL:
+		if (str && !strcmp(str, "0"))
+			return 0;
+
+		break;
+	default:
+		return -1;
+	}
+	return swlib_set_attr(dev, a, &val);
+}
+
+
+struct attrlist_arg {
+	int id;
+	int atype;
+	struct switch_dev *dev;
+	struct switch_attr *prev;
+	struct switch_attr **head;
+};
+
+static int
+add_id(struct nl_msg *msg, void *arg)
+{
+	struct attrlist_arg *l = arg;
+
+	NLA_PUT_U32(msg, SWITCH_ATTR_ID, l->id);
+
+	return 0;
+nla_put_failure:
+	return -1;
+}
+
+static int
+add_attr(struct nl_msg *msg, void *ptr)
+{
+	struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
+	struct attrlist_arg *arg = ptr;
+	struct switch_attr *new;
+
+	if (nla_parse(tb, SWITCH_ATTR_MAX - 1, genlmsg_attrdata(gnlh, 0),
+			genlmsg_attrlen(gnlh, 0), NULL) < 0)
+		goto done;
+
+	new = swlib_alloc(sizeof(struct switch_attr));
+	if (!new)
+		goto done;
+
+	new->dev = arg->dev;
+	new->atype = arg->atype;
+	if (arg->prev) {
+		arg->prev->next = new;
+	} else {
+		arg->prev = *arg->head;
+	}
+	*arg->head = new;
+	arg->head = &new->next;
+
+	if (tb[SWITCH_ATTR_OP_ID])
+		new->id = nla_get_u32(tb[SWITCH_ATTR_OP_ID]);
+	if (tb[SWITCH_ATTR_OP_TYPE])
+		new->type = nla_get_u32(tb[SWITCH_ATTR_OP_TYPE]);
+	if (tb[SWITCH_ATTR_OP_NAME])
+		new->name = strdup(nla_get_string(tb[SWITCH_ATTR_OP_NAME]));
+	if (tb[SWITCH_ATTR_OP_DESCRIPTION])
+		new->description = strdup(nla_get_string(tb[SWITCH_ATTR_OP_DESCRIPTION]));
+
+done:
+	return NL_SKIP;
+}
+
+int
+swlib_scan(struct switch_dev *dev)
+{
+	struct attrlist_arg arg;
+
+	if (dev->ops || dev->port_ops || dev->vlan_ops)
+		return 0;
+
+	arg.atype = SWLIB_ATTR_GROUP_GLOBAL;
+	arg.dev = dev;
+	arg.id = dev->id;
+	arg.prev = NULL;
+	arg.head = &dev->ops;
+	swlib_call(SWITCH_CMD_LIST_GLOBAL, add_attr, add_id, &arg);
+
+	arg.atype = SWLIB_ATTR_GROUP_PORT;
+	arg.prev = NULL;
+	arg.head = &dev->port_ops;
+	swlib_call(SWITCH_CMD_LIST_PORT, add_attr, add_id, &arg);
+
+	arg.atype = SWLIB_ATTR_GROUP_VLAN;
+	arg.prev = NULL;
+	arg.head = &dev->vlan_ops;
+	swlib_call(SWITCH_CMD_LIST_VLAN, add_attr, add_id, &arg);
+
+	return 0;
+}
+
+struct switch_attr *swlib_lookup_attr(struct switch_dev *dev,
+		enum swlib_attr_group atype, const char *name)
+{
+	struct switch_attr *head;
+
+	if (!name || !dev)
+		return NULL;
+
+	switch(atype) {
+	case SWLIB_ATTR_GROUP_GLOBAL:
+		head = dev->ops;
+		break;
+	case SWLIB_ATTR_GROUP_PORT:
+		head = dev->port_ops;
+		break;
+	case SWLIB_ATTR_GROUP_VLAN:
+		head = dev->vlan_ops;
+		break;
+	}
+	while(head) {
+		if (!strcmp(name, head->name))
+			return head;
+		head = head->next;
+	}
+
+	return NULL;
+}
+
+static void
+swlib_priv_free(void)
+{
+	if (cache)
+		nl_cache_free(cache);
+	if (handle)
+		nl_socket_free(handle);
+	handle = NULL;
+	cache = NULL;
+}
+
+static int
+swlib_priv_init(void)
+{
+	int ret;
+
+	handle = nl_socket_alloc();
+	if (!handle) {
+		DPRINTF("Failed to create handle\n");
+		goto err;
+	}
+
+	if (genl_connect(handle)) {
+		DPRINTF("Failed to connect to generic netlink\n");
+		goto err;
+	}
+
+	ret = genl_ctrl_alloc_cache(handle, &cache);
+	if (ret < 0) {
+		DPRINTF("Failed to allocate netlink cache\n");
+		goto err;
+	}
+
+	family = genl_ctrl_search_by_name(cache, "switch");
+	if (!family) {
+		DPRINTF("Switch API not present\n");
+		goto err;
+	}
+	return 0;
+
+err:
+	swlib_priv_free();
+	return -EINVAL;
+}
+
+struct swlib_scan_arg {
+	const char *name;
+	struct switch_dev *head;
+	struct switch_dev *ptr;
+};
+
+static int
+add_switch(struct nl_msg *msg, void *arg)
+{
+	struct swlib_scan_arg *sa = arg;
+	struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
+	struct switch_dev *dev;
+	const char *name;
+	const char *alias;
+
+	if (nla_parse(tb, SWITCH_ATTR_MAX, genlmsg_attrdata(gnlh, 0), genlmsg_attrlen(gnlh, 0), NULL) < 0)
+		goto done;
+
+	if (!tb[SWITCH_ATTR_DEV_NAME])
+		goto done;
+
+	name = nla_get_string(tb[SWITCH_ATTR_DEV_NAME]);
+	alias = nla_get_string(tb[SWITCH_ATTR_ALIAS]);
+
+	if (sa->name && (strcmp(name, sa->name) != 0) && (strcmp(alias, sa->name) != 0))
+		goto done;
+
+	dev = swlib_alloc(sizeof(struct switch_dev));
+	if (!dev)
+		goto done;
+
+	strncpy(dev->dev_name, name, IFNAMSIZ - 1);
+	dev->alias = strdup(alias);
+	if (tb[SWITCH_ATTR_ID])
+		dev->id = nla_get_u32(tb[SWITCH_ATTR_ID]);
+	if (tb[SWITCH_ATTR_NAME])
+		dev->name = strdup(nla_get_string(tb[SWITCH_ATTR_NAME]));
+	if (tb[SWITCH_ATTR_PORTS])
+		dev->ports = nla_get_u32(tb[SWITCH_ATTR_PORTS]);
+	if (tb[SWITCH_ATTR_VLANS])
+		dev->vlans = nla_get_u32(tb[SWITCH_ATTR_VLANS]);
+	if (tb[SWITCH_ATTR_CPU_PORT])
+		dev->cpu_port = nla_get_u32(tb[SWITCH_ATTR_CPU_PORT]);
+
+	if (!sa->head) {
+		sa->head = dev;
+		sa->ptr = dev;
+	} else {
+		sa->ptr->next = dev;
+		sa->ptr = dev;
+	}
+
+	refcount++;
+done:
+	return NL_SKIP;
+}
+
+
+struct switch_dev *
+swlib_connect(const char *name)
+{
+	struct swlib_scan_arg arg;
+	int err;
+
+	if (!refcount) {
+		if (swlib_priv_init() < 0)
+			return NULL;
+	};
+
+	arg.head = NULL;
+	arg.ptr = NULL;
+	arg.name = name;
+	swlib_call(SWITCH_CMD_GET_SWITCH, add_switch, NULL, &arg);
+
+	if (!refcount)
+		swlib_priv_free();
+
+	return arg.head;
+}
+
+static void
+swlib_free_attributes(struct switch_attr **head)
+{
+	struct switch_attr *a = *head;
+	struct switch_attr *next;
+
+	while (a) {
+		next = a->next;
+		free(a);
+		a = next;
+	}
+	*head = NULL;
+}
+
+void
+swlib_free(struct switch_dev *dev)
+{
+	swlib_free_attributes(&dev->ops);
+	swlib_free_attributes(&dev->port_ops);
+	swlib_free_attributes(&dev->vlan_ops);
+	free(dev);
+
+	if (--refcount == 0)
+		swlib_priv_free();
+}
+
+void
+swlib_free_all(struct switch_dev *dev)
+{
+	struct switch_dev *p;
+
+	while (dev) {
+		p = dev->next;
+		swlib_free(dev);
+		dev = p;
+	}
+}