+/*
+ * 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];
+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)
+ {
+ 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;
+ ptr++;
+ }
+ if (*ptr)
+ ptr++;
+ val.len++;
+ }
+ val.value.ports = ports;
+ break;
+ case SWITCH_TYPE_NOVAL:
+ 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;
+
+ 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]);
+ if (sa->name && (strcmp(name, sa->name) != 0))
+ goto done;
+
+ dev = swlib_alloc(sizeof(struct switch_dev));
+ if (!dev)
+ goto done;
+
+ dev->dev_name = strdup(name);
+ 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_DEV_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 (!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;
+ }
+}
projects / openwrt / svn-archive / archive.git / commitdiff