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ieee802154: add wpan_phy dump support
This patch adds support for dumping wpan_phy attributes via nl802154. Signed-off-by: Alexander Aring <alex.aring@gmail.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Alexander Aring
Marcel Holtmann
parent
79fe1a2aa7
commit
ca20ce201c
@ -27,7 +27,7 @@
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/* RCU-protected (and RTNL for writers) */
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LIST_HEAD(cfg802154_rdev_list);
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static int cfg802154_rdev_list_generation;
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int cfg802154_rdev_list_generation;
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static int wpan_phy_match(struct device *dev, const void *data)
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{
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@ -36,6 +36,7 @@ wpan_phy_to_rdev(struct wpan_phy *wpan_phy)
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}
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extern struct list_head cfg802154_rdev_list;
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extern int cfg802154_rdev_list_generation;
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/* free object */
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void cfg802154_dev_free(struct cfg802154_registered_device *rdev);
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@ -193,6 +193,22 @@ cfg802154_get_dev_from_info(struct net *netns, struct genl_info *info)
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/* policy for the attributes */
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static const struct nla_policy nl802154_policy[NL802154_ATTR_MAX+1] = {
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[NL802154_ATTR_WPAN_PHY] = { .type = NLA_U32 },
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[NL802154_ATTR_WPAN_PHY_NAME] = { .type = NLA_NUL_STRING,
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.len = 20-1 },
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[NL802154_ATTR_IFINDEX] = { .type = NLA_U32 },
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[NL802154_ATTR_WPAN_DEV] = { .type = NLA_U64 },
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[NL802154_ATTR_PAGE] = { .type = NLA_U8, },
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[NL802154_ATTR_CHANNEL] = { .type = NLA_U8, },
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[NL802154_ATTR_TX_POWER] = { .type = NLA_S8, },
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[NL802154_ATTR_CCA_MODE] = { .type = NLA_U8, },
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[NL802154_ATTR_SUPPORTED_CHANNEL] = { .type = NLA_U32, },
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};
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/* message building helper */
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@ -203,6 +219,201 @@ static inline void *nl802154hdr_put(struct sk_buff *skb, u32 portid, u32 seq,
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return genlmsg_put(skb, portid, seq, &nl802154_fam, flags, cmd);
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}
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static int
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nl802154_send_wpan_phy_channels(struct cfg802154_registered_device *rdev,
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struct sk_buff *msg)
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{
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struct nlattr *nl_page;
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unsigned long page;
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nl_page = nla_nest_start(msg, NL802154_ATTR_CHANNELS_SUPPORTED);
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if (!nl_page)
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return -ENOBUFS;
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for (page = 0; page < WPAN_NUM_PAGES; page++) {
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if (nla_put_u32(msg, NL802154_ATTR_SUPPORTED_CHANNEL,
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rdev->wpan_phy.channels_supported[page]))
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return -ENOBUFS;
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}
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nla_nest_end(msg, nl_page);
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return 0;
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}
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static int nl802154_send_wpan_phy(struct cfg802154_registered_device *rdev,
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enum nl802154_commands cmd,
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struct sk_buff *msg, u32 portid, u32 seq,
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int flags)
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{
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void *hdr;
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hdr = nl802154hdr_put(msg, portid, seq, flags, cmd);
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if (!hdr)
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return -ENOBUFS;
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if (nla_put_u32(msg, NL802154_ATTR_WPAN_PHY, rdev->wpan_phy_idx) ||
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nla_put_string(msg, NL802154_ATTR_WPAN_PHY_NAME,
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wpan_phy_name(&rdev->wpan_phy)) ||
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nla_put_u32(msg, NL802154_ATTR_GENERATION,
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cfg802154_rdev_list_generation))
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goto nla_put_failure;
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if (cmd != NL802154_CMD_NEW_WPAN_PHY)
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goto finish;
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/* DUMP PHY PIB */
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/* current channel settings */
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if (nla_put_u8(msg, NL802154_ATTR_PAGE,
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rdev->wpan_phy.current_page) ||
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nla_put_u8(msg, NL802154_ATTR_CHANNEL,
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rdev->wpan_phy.current_channel))
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goto nla_put_failure;
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/* supported channels array */
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if (nl802154_send_wpan_phy_channels(rdev, msg))
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goto nla_put_failure;
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/* cca mode */
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if (nla_put_u8(msg, NL802154_ATTR_CCA_MODE,
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rdev->wpan_phy.cca_mode))
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goto nla_put_failure;
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if (nla_put_s8(msg, NL802154_ATTR_TX_POWER,
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rdev->wpan_phy.transmit_power))
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goto nla_put_failure;
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finish:
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return genlmsg_end(msg, hdr);
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nla_put_failure:
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genlmsg_cancel(msg, hdr);
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return -EMSGSIZE;
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}
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struct nl802154_dump_wpan_phy_state {
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s64 filter_wpan_phy;
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long start;
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};
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static int nl802154_dump_wpan_phy_parse(struct sk_buff *skb,
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struct netlink_callback *cb,
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struct nl802154_dump_wpan_phy_state *state)
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{
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struct nlattr **tb = nl802154_fam.attrbuf;
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int ret = nlmsg_parse(cb->nlh, GENL_HDRLEN + nl802154_fam.hdrsize,
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tb, nl802154_fam.maxattr, nl802154_policy);
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/* TODO check if we can handle error here,
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* we have no backward compatibility
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*/
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if (ret)
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return 0;
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if (tb[NL802154_ATTR_WPAN_PHY])
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state->filter_wpan_phy = nla_get_u32(tb[NL802154_ATTR_WPAN_PHY]);
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if (tb[NL802154_ATTR_WPAN_DEV])
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state->filter_wpan_phy = nla_get_u64(tb[NL802154_ATTR_WPAN_DEV]) >> 32;
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if (tb[NL802154_ATTR_IFINDEX]) {
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struct net_device *netdev;
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struct cfg802154_registered_device *rdev;
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int ifidx = nla_get_u32(tb[NL802154_ATTR_IFINDEX]);
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/* TODO netns */
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netdev = __dev_get_by_index(&init_net, ifidx);
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if (!netdev)
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return -ENODEV;
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if (netdev->ieee802154_ptr) {
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rdev = wpan_phy_to_rdev(
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netdev->ieee802154_ptr->wpan_phy);
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state->filter_wpan_phy = rdev->wpan_phy_idx;
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}
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}
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return 0;
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}
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static int
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nl802154_dump_wpan_phy(struct sk_buff *skb, struct netlink_callback *cb)
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{
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int idx = 0, ret;
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struct nl802154_dump_wpan_phy_state *state = (void *)cb->args[0];
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struct cfg802154_registered_device *rdev;
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rtnl_lock();
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if (!state) {
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state = kzalloc(sizeof(*state), GFP_KERNEL);
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if (!state) {
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rtnl_unlock();
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return -ENOMEM;
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}
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state->filter_wpan_phy = -1;
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ret = nl802154_dump_wpan_phy_parse(skb, cb, state);
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if (ret) {
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kfree(state);
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rtnl_unlock();
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return ret;
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}
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cb->args[0] = (long)state;
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}
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list_for_each_entry(rdev, &cfg802154_rdev_list, list) {
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/* TODO net ns compare */
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if (++idx <= state->start)
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continue;
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if (state->filter_wpan_phy != -1 &&
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state->filter_wpan_phy != rdev->wpan_phy_idx)
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continue;
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/* attempt to fit multiple wpan_phy data chunks into the skb */
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ret = nl802154_send_wpan_phy(rdev,
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NL802154_CMD_NEW_WPAN_PHY,
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skb,
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NETLINK_CB(cb->skb).portid,
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cb->nlh->nlmsg_seq, NLM_F_MULTI);
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if (ret < 0) {
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if ((ret == -ENOBUFS || ret == -EMSGSIZE) &&
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!skb->len && cb->min_dump_alloc < 4096) {
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cb->min_dump_alloc = 4096;
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rtnl_unlock();
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return 1;
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}
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idx--;
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break;
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}
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break;
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}
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rtnl_unlock();
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state->start = idx;
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return skb->len;
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}
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static int nl802154_dump_wpan_phy_done(struct netlink_callback *cb)
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{
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kfree((void *)cb->args[0]);
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return 0;
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}
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static int nl802154_get_wpan_phy(struct sk_buff *skb, struct genl_info *info)
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{
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struct sk_buff *msg;
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struct cfg802154_registered_device *rdev = info->user_ptr[0];
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msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
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if (!msg)
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return -ENOMEM;
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if (nl802154_send_wpan_phy(rdev, NL802154_CMD_NEW_WPAN_PHY, msg,
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info->snd_portid, info->snd_seq, 0) < 0) {
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nlmsg_free(msg);
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return -ENOBUFS;
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}
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return genlmsg_reply(msg, info);
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}
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#define NL802154_FLAG_NEED_WPAN_PHY 0x01
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#define NL802154_FLAG_NEED_NETDEV 0x02
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#define NL802154_FLAG_NEED_RTNL 0x04
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@ -294,6 +505,16 @@ static void nl802154_post_doit(const struct genl_ops *ops, struct sk_buff *skb,
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}
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static const struct genl_ops nl802154_ops[] = {
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{
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.cmd = NL802154_CMD_GET_WPAN_PHY,
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.doit = nl802154_get_wpan_phy,
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.dumpit = nl802154_dump_wpan_phy,
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.done = nl802154_dump_wpan_phy_done,
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.policy = nl802154_policy,
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/* can be retrieved by unprivileged users */
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.internal_flags = NL802154_FLAG_NEED_WPAN_PHY |
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NL802154_FLAG_NEED_RTNL,
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},
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};
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/* initialisation/exit functions */
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