+++ /dev/null
-/*
- * wprobe.c: Wireless probe user space library
- * Copyright (C) 2008-2009 Felix Fietkau <nbd@openwrt.org>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * 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 <errno.h>
-#include <getopt.h>
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <math.h>
-#include <linux/wprobe.h>
-#include <netlink/netlink.h>
-#include <netlink/genl/genl.h>
-#include <netlink/genl/ctrl.h>
-#include <netlink/genl/family.h>
-#include "wprobe.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 int n_devs = 0;
-static struct nl_sock *handle = NULL;
-static struct nl_cache *cache = NULL;
-static struct genl_family *family = NULL;
-static struct nlattr *tb[WPROBE_ATTR_LAST+1];
-static struct nla_policy attribute_policy[WPROBE_ATTR_LAST+1] = {
- [WPROBE_ATTR_ID] = { .type = NLA_U32 },
- [WPROBE_ATTR_MAC] = { .type = NLA_UNSPEC, .minlen = 6, .maxlen = 6 },
- [WPROBE_ATTR_NAME] = { .type = NLA_STRING },
- [WPROBE_ATTR_FLAGS] = { .type = NLA_U32 },
- [WPROBE_ATTR_TYPE] = { .type = NLA_U8 },
- [WPROBE_VAL_S8] = { .type = NLA_U8 },
- [WPROBE_VAL_S16] = { .type = NLA_U16 },
- [WPROBE_VAL_S32] = { .type = NLA_U32 },
- [WPROBE_VAL_S64] = { .type = NLA_U64 },
- [WPROBE_VAL_U8] = { .type = NLA_U8 },
- [WPROBE_VAL_U16] = { .type = NLA_U16 },
- [WPROBE_VAL_U32] = { .type = NLA_U32 },
- [WPROBE_VAL_U64] = { .type = NLA_U64 },
- [WPROBE_VAL_SUM] = { .type = NLA_U64 },
- [WPROBE_VAL_SUM_SQ] = { .type = NLA_U64 },
- [WPROBE_VAL_SAMPLES] = { .type = NLA_U32 },
-};
-
-static int
-error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg)
-{
- int *ret = arg;
- *ret = err->error;
- return NL_STOP;
-}
-
-static int
-finish_handler(struct nl_msg *msg, void *arg)
-{
- int *ret = arg;
- *ret = 0;
- return NL_SKIP;
-}
-
-static int
-ack_handler(struct nl_msg *msg, void *arg)
-{
- int *ret = arg;
- *ret = 0;
- return NL_STOP;
-}
-
-
-static void
-wprobe_free(void)
-{
- /* should not happen */
- if (n_devs == 0)
- return;
-
- if (--n_devs != 0)
- return;
-
- if (cache)
- nl_cache_free(cache);
- if (handle)
- nl_socket_free(handle);
- handle = NULL;
- cache = NULL;
-}
-
-static int
-wprobe_init(void)
-{
- int ret;
-
- if (n_devs++ > 0)
- return 0;
-
- 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, "wprobe");
- if (!family) {
- DPRINTF("wprobe API not present\n");
- goto err;
- }
- return 0;
-
-err:
- wprobe_free();
- return -EINVAL;
-}
-
-
-static struct nl_msg *
-wprobe_new_msg(const char *ifname, int cmd, bool dump)
-{
- struct nl_msg *msg;
- uint32_t flags = 0;
-
- msg = nlmsg_alloc();
- if (!msg)
- return NULL;
-
- if (dump)
- flags |= NLM_F_DUMP;
-
- genlmsg_put(msg, 0, 0, genl_family_get_id(family),
- 0, flags, cmd, 0);
-
- NLA_PUT_STRING(msg, WPROBE_ATTR_INTERFACE, ifname);
-nla_put_failure:
- return msg;
-}
-
-static int
-wprobe_send_msg(struct nl_msg *msg, void *callback, void *arg)
-{
- struct nl_cb *cb;
- int err = 0;
-
- cb = nl_cb_alloc(NL_CB_DEFAULT);
- if (!cb)
- goto out_no_cb;
-
- if (callback)
- nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, callback, arg);
-
- err = nl_send_auto_complete(handle, msg);
- if (err < 0)
- goto out;
-
- err = 1;
-
- nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &err);
- nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, finish_handler, &err);
- nl_cb_set(cb, NL_CB_ACK, NL_CB_CUSTOM, ack_handler, &err);
-
- while (err > 0)
- nl_recvmsgs(handle, cb);
-
-out:
- nl_cb_put(cb);
-out_no_cb:
- nlmsg_free(msg);
- return err;
-}
-
-struct wprobe_attr_cb {
- struct list_head *list;
- char *addr;
-};
-
-static int
-save_attribute_handler(struct nl_msg *msg, void *arg)
-{
- struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
- const char *name = "N/A";
- struct wprobe_attribute *attr;
- int type = 0;
- struct wprobe_attr_cb *cb = arg;
-
- nla_parse(tb, WPROBE_ATTR_LAST, genlmsg_attrdata(gnlh, 0),
- genlmsg_attrlen(gnlh, 0), attribute_policy);
-
- if (tb[WPROBE_ATTR_NAME])
- name = nla_data(tb[WPROBE_ATTR_NAME]);
-
- attr = malloc(sizeof(struct wprobe_attribute) + strlen(name) + 1);
- if (!attr)
- return -1;
-
- memset(attr, 0, sizeof(struct wprobe_attribute));
-
- if (tb[WPROBE_ATTR_ID])
- attr->id = nla_get_u32(tb[WPROBE_ATTR_ID]);
-
- if (tb[WPROBE_ATTR_MAC] && cb->addr)
- memcpy(cb->addr, nla_data(tb[WPROBE_ATTR_MAC]), 6);
-
- if (tb[WPROBE_ATTR_FLAGS])
- attr->flags = nla_get_u32(tb[WPROBE_ATTR_FLAGS]);
-
- if (tb[WPROBE_ATTR_TYPE])
- type = nla_get_u8(tb[WPROBE_ATTR_TYPE]);
-
- if ((type < WPROBE_VAL_STRING) ||
- (type > WPROBE_VAL_U64))
- type = 0;
-
- attr->type = type;
- strcpy(attr->name, name);
- INIT_LIST_HEAD(&attr->list);
- list_add(&attr->list, cb->list);
- return 0;
-}
-
-
-static int
-dump_attributes(const char *ifname, bool link, struct list_head *list, char *addr)
-{
- struct nl_msg *msg;
- struct wprobe_attr_cb cb;
-
- cb.list = list;
- cb.addr = addr;
- msg = wprobe_new_msg(ifname, WPROBE_CMD_GET_LIST, true);
- if (!msg)
- return -ENOMEM;
-
- if (link)
- NLA_PUT(msg, WPROBE_ATTR_MAC, 6, "\x00\x00\x00\x00\x00\x00");
-
- return wprobe_send_msg(msg, save_attribute_handler, &cb);
-
-nla_put_failure:
- nlmsg_free(msg);
- return -EINVAL;
-}
-
-struct wprobe_iface *
-wprobe_get_dev(const char *ifname)
-{
- struct wprobe_iface *dev;
-
- if (wprobe_init() != 0)
- return NULL;
-
- dev = malloc(sizeof(struct wprobe_iface));
- if (!dev)
- return NULL;
-
- memset(dev, 0, sizeof(struct wprobe_iface));
- dev->ifname = strdup(ifname);
- if (!dev->ifname)
- goto error;
-
- dev->interval = -1;
- dev->scale_min = -1;
- dev->scale_max = -1;
- dev->scale_m = -1;
- dev->scale_d = -1;
-
- INIT_LIST_HEAD(&dev->global_attr);
- INIT_LIST_HEAD(&dev->link_attr);
- INIT_LIST_HEAD(&dev->links);
-
- dump_attributes(ifname, false, &dev->global_attr, NULL);
- dump_attributes(ifname, true, &dev->link_attr, NULL);
-
- return dev;
-
-error:
- free(dev);
- return NULL;
-}
-
-static void
-free_attr_list(struct list_head *list)
-{
- struct wprobe_attribute *attr, *tmp;
-
- list_for_each_entry_safe(attr, tmp, list, list) {
- list_del(&attr->list);
- free(attr);
- }
-}
-
-void
-wprobe_free_dev(struct wprobe_iface *dev)
-{
- wprobe_free();
- free_attr_list(&dev->global_attr);
- free_attr_list(&dev->link_attr);
- free((void *)dev->ifname);
- free(dev);
-}
-
-static struct wprobe_link *
-get_link(struct list_head *list, const char *addr)
-{
- struct wprobe_link *l;
-
- list_for_each_entry(l, list, list) {
- if (!memcmp(l->addr, addr, 6)) {
- list_del_init(&l->list);
- goto out;
- }
- }
-
- /* no previous link found, allocate a new one */
- l = malloc(sizeof(struct wprobe_link));
- if (!l)
- goto out;
-
- memset(l, 0, sizeof(struct wprobe_link));
- memcpy(l->addr, addr, sizeof(l->addr));
- INIT_LIST_HEAD(&l->list);
-
-out:
- return l;
-}
-
-struct wprobe_save_cb {
- struct list_head *list;
- struct list_head old_list;
-};
-
-static int
-save_link_handler(struct nl_msg *msg, void *arg)
-{
- struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
- struct wprobe_link *link;
- struct wprobe_save_cb *cb = arg;
- const char *addr;
-
- nla_parse(tb, WPROBE_ATTR_LAST, genlmsg_attrdata(gnlh, 0),
- genlmsg_attrlen(gnlh, 0), attribute_policy);
-
- if (!tb[WPROBE_ATTR_MAC] || (nla_len(tb[WPROBE_ATTR_MAC]) != 6))
- return -1;
-
- addr = nla_data(tb[WPROBE_ATTR_MAC]);
- link = get_link(&cb->old_list, addr);
- if (!link)
- return -1;
-
- if (tb[WPROBE_ATTR_FLAGS])
- link->flags = nla_get_u32(tb[WPROBE_ATTR_FLAGS]);
-
- list_add_tail(&link->list, cb->list);
- return 0;
-}
-
-
-int
-wprobe_update_links(struct wprobe_iface *dev)
-{
- struct wprobe_link *l, *tmp;
- struct nl_msg *msg;
- struct wprobe_save_cb cb;
- int err;
-
- INIT_LIST_HEAD(&cb.old_list);
- list_splice_init(&dev->links, &cb.old_list);
- cb.list = &dev->links;
-
- msg = wprobe_new_msg(dev->ifname, WPROBE_CMD_GET_LINKS, true);
- if (!msg)
- return -ENOMEM;
-
- err = wprobe_send_msg(msg, save_link_handler, &cb);
- if (err < 0)
- return err;
-
- list_for_each_entry_safe(l, tmp, &cb.old_list, list) {
- list_del(&l->list);
- free(l);
- }
-
- return 0;
-}
-
-int
-wprobe_apply_config(struct wprobe_iface *dev)
-{
- struct nl_msg *msg;
-
- msg = wprobe_new_msg(dev->ifname, WPROBE_CMD_CONFIG, false);
- if (!msg)
- return -ENOMEM;
-
- if (dev->interval >= 0)
- NLA_PUT_MSECS(msg, WPROBE_ATTR_INTERVAL, dev->interval);
-
- wprobe_send_msg(msg, NULL, NULL);
- return 0;
-
-nla_put_failure:
- nlmsg_free(msg);
- return -ENOMEM;
-}
-
-int
-wprobe_measure(struct wprobe_iface *dev)
-{
- struct nl_msg *msg;
-
- msg = wprobe_new_msg(dev->ifname, WPROBE_CMD_MEASURE, false);
- if (!msg)
- return -ENOMEM;
-
- wprobe_send_msg(msg, NULL, NULL);
- return 0;
-}
-
-struct wprobe_request_cb {
- struct list_head *list;
- struct list_head old_list;
- char *addr;
-};
-
-static int
-save_attrdata_handler(struct nl_msg *msg, void *arg)
-{
- struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
- struct wprobe_request_cb *cb = arg;
- struct wprobe_attribute *attr;
- int type, id;
-
- nla_parse(tb, WPROBE_ATTR_LAST, genlmsg_attrdata(gnlh, 0),
- genlmsg_attrlen(gnlh, 0), attribute_policy);
-
- if (!tb[WPROBE_ATTR_ID])
- return -1;
-
- if (!tb[WPROBE_ATTR_TYPE])
- return -1;
-
- id = nla_get_u32(tb[WPROBE_ATTR_ID]);
- list_for_each_entry(attr, &cb->old_list, list) {
- if (attr->id == id)
- goto found;
- }
- /* not found */
- return -1;
-
-found:
- list_del_init(&attr->list);
-
- type = nla_get_u8(tb[WPROBE_ATTR_TYPE]);
- if (type != attr->type) {
- DPRINTF("WARNING: type mismatch for %s attribute '%s' (%d != %d)\n",
- (cb->addr ? "link" : "global"),
- attr->name,
- type, attr->type);
- goto out;
- }
-
- if ((type < WPROBE_VAL_STRING) ||
- (type > WPROBE_VAL_U64))
- goto out;
-
- memset(&attr->val, 0, sizeof(attr->val));
-
-#define HANDLE_INT_TYPE(_idx, _type) \
- case WPROBE_VAL_S##_type: \
- case WPROBE_VAL_U##_type: \
- attr->val.U##_type = nla_get_u##_type(tb[_idx]); \
- break
-
- switch(type) {
- HANDLE_INT_TYPE(type, 8);
- HANDLE_INT_TYPE(type, 16);
- HANDLE_INT_TYPE(type, 32);
- HANDLE_INT_TYPE(type, 64);
- case WPROBE_VAL_STRING:
- /* unimplemented */
- break;
- }
-#undef HANDLE_TYPE
-
- if (attr->flags & WPROBE_F_KEEPSTAT) {
- if (tb[WPROBE_VAL_SUM])
- attr->val.s = nla_get_u64(tb[WPROBE_VAL_SUM]);
-
- if (tb[WPROBE_VAL_SUM_SQ])
- attr->val.ss = nla_get_u64(tb[WPROBE_VAL_SUM_SQ]);
-
- if (tb[WPROBE_VAL_SAMPLES])
- attr->val.n = nla_get_u32(tb[WPROBE_VAL_SAMPLES]);
-
- if (attr->val.n > 0) {
- float avg = ((float) attr->val.s) / attr->val.n;
- float stdev = sqrt((((float) attr->val.ss) / attr->val.n) - (avg * avg));
- if (isnan(stdev))
- stdev = 0.0f;
- if (isnan(avg))
- avg = 0.0f;
- attr->val.avg = avg;
- attr->val.stdev = stdev;
- }
- }
-
-out:
- list_add_tail(&attr->list, cb->list);
- return 0;
-}
-
-
-int
-wprobe_request_data(struct wprobe_iface *dev, const unsigned char *addr)
-{
- struct wprobe_request_cb cb;
- struct list_head *attrs;
- struct nl_msg *msg;
- int err;
-
- msg = wprobe_new_msg(dev->ifname, WPROBE_CMD_GET_INFO, true);
- if (!msg)
- return -ENOMEM;
-
- if (addr) {
- attrs = &dev->link_attr;
- NLA_PUT(msg, WPROBE_ATTR_MAC, 6, addr);
- } else {
- attrs = &dev->global_attr;
- }
-
- INIT_LIST_HEAD(&cb.old_list);
- list_splice_init(attrs, &cb.old_list);
- cb.list = attrs;
-
- err = wprobe_send_msg(msg, save_attrdata_handler, &cb);
- list_splice(&cb.old_list, attrs->prev);
- return err;
-
-nla_put_failure:
- nlmsg_free(msg);
- return -ENOMEM;
-}
-
-
projects / openwrt / staging / florian.git / blobdiff