This patch adds support for dumping wpan_phy attributes via nl802154.
Signed-off-by: Alexander Aring <alex.aring@xxxxxxxxx>
---
net/ieee802154/core.c | 2 +-
net/ieee802154/core.h | 1 +
net/ieee802154/nl802154.c | 221 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 223 insertions(+), 1 deletion(-)
diff --git a/net/ieee802154/core.c b/net/ieee802154/core.c
index ae5ecbc..18bc7e7 100644
--- a/net/ieee802154/core.c
+++ b/net/ieee802154/core.c
@@ -27,7 +27,7 @@
/* RCU-protected (and RTNL for writers) */
LIST_HEAD(cfg802154_rdev_list);
-static int cfg802154_rdev_list_generation;
+int cfg802154_rdev_list_generation;
static int wpan_phy_match(struct device *dev, const void *data)
{
diff --git a/net/ieee802154/core.h b/net/ieee802154/core.h
index c8319bf..f3e9558 100644
--- a/net/ieee802154/core.h
+++ b/net/ieee802154/core.h
@@ -36,6 +36,7 @@ wpan_phy_to_rdev(struct wpan_phy *wpan_phy)
}
extern struct list_head cfg802154_rdev_list;
+extern int cfg802154_rdev_list_generation;
/* free object */
void cfg802154_dev_free(struct cfg802154_registered_device *rdev);
diff --git a/net/ieee802154/nl802154.c b/net/ieee802154/nl802154.c
index 5dec0bb..32e8847 100644
--- a/net/ieee802154/nl802154.c
+++ b/net/ieee802154/nl802154.c
@@ -193,6 +193,22 @@ cfg802154_get_dev_from_info(struct net *netns, struct genl_info *info)
/* policy for the attributes */
static const struct nla_policy nl802154_policy[NL802154_ATTR_MAX+1] = {
+ [NL802154_ATTR_WPAN_PHY] = { .type = NLA_U32 },
+ [NL802154_ATTR_WPAN_PHY_NAME] = { .type = NLA_NUL_STRING,
+ .len = 20-1 },
+
+ [NL802154_ATTR_IFINDEX] = { .type = NLA_U32 },
+
+ [NL802154_ATTR_WPAN_DEV] = { .type = NLA_U64 },
+
+ [NL802154_ATTR_PAGE] = { .type = NLA_U8, },
+ [NL802154_ATTR_CHANNEL] = { .type = NLA_U8, },
+
+ [NL802154_ATTR_TX_POWER] = { .type = NLA_S8, },
+
+ [NL802154_ATTR_CCA_MODE] = { .type = NLA_U8, },
+
+ [NL802154_ATTR_SUPPORTED_CHANNEL] = { .type = NLA_U32, },
};
/* message building helper */
@@ -203,6 +219,201 @@ static inline void *nl802154hdr_put(struct sk_buff *skb, u32 portid, u32 seq,
return genlmsg_put(skb, portid, seq, &nl802154_fam, flags, cmd);
}
+static int
+nl802154_send_wpan_phy_channels(struct cfg802154_registered_device *rdev,
+ struct sk_buff *msg)
+{
+ struct nlattr *nl_page;
+ unsigned long page;
+
+ nl_page = nla_nest_start(msg, NL802154_ATTR_CHANNELS_SUPPORTED);
+ if (!nl_page)
+ return -ENOBUFS;
+
+ for (page = 0; page < WPAN_NUM_PAGES; page++) {
+ if (nla_put_u32(msg, NL802154_ATTR_SUPPORTED_CHANNEL,
+ rdev->wpan_phy.channels_supported[page]))
+ return -ENOBUFS;
+ }
+ nla_nest_end(msg, nl_page);
+
+ return 0;
+}
+
+static int nl802154_send_wpan_phy(struct cfg802154_registered_device *rdev,
+ enum nl802154_commands cmd,
+ struct sk_buff *msg, u32 portid, u32 seq,
+ int flags)
+{
+ void *hdr;
+
+ hdr = nl802154hdr_put(msg, portid, seq, flags, cmd);
+ if (!hdr)
+ return -ENOBUFS;
+
+ if (nla_put_u32(msg, NL802154_ATTR_WPAN_PHY, rdev->wpan_phy_idx) ||
+ nla_put_string(msg, NL802154_ATTR_WPAN_PHY_NAME,
+ wpan_phy_name(&rdev->wpan_phy)) ||
+ nla_put_u32(msg, NL802154_ATTR_GENERATION,
+ cfg802154_rdev_list_generation))
+ goto nla_put_failure;
+
+ if (cmd != NL802154_CMD_NEW_WPAN_PHY)
+ goto finish;
+
+ /* DUMP PHY PIB */
+
+ /* current channel settings */
+ if (nla_put_u8(msg, NL802154_ATTR_PAGE,
+ rdev->wpan_phy.current_page) ||
+ nla_put_u8(msg, NL802154_ATTR_CHANNEL,
+ rdev->wpan_phy.current_channel))
+ goto nla_put_failure;
+
+ /* supported channels array */
+ if (nl802154_send_wpan_phy_channels(rdev, msg))
+ goto nla_put_failure;
+
+ /* cca mode */
+ if (nla_put_u8(msg, NL802154_ATTR_CCA_MODE,
+ rdev->wpan_phy.cca_mode))
+ goto nla_put_failure;
+
+ if (nla_put_s8(msg, NL802154_ATTR_TX_POWER,
+ rdev->wpan_phy.transmit_power))
+ goto nla_put_failure;
+
+finish:
+ return genlmsg_end(msg, hdr);
+
+nla_put_failure:
+ genlmsg_cancel(msg, hdr);
+ return -EMSGSIZE;
+}
+
+struct nl802154_dump_wpan_phy_state {
+ s64 filter_wpan_phy;
+ long start;
+
+};
+
+static int nl802154_dump_wpan_phy_parse(struct sk_buff *skb,
+ struct netlink_callback *cb,
+ struct nl802154_dump_wpan_phy_state *state)
+{
+ struct nlattr **tb = nl802154_fam.attrbuf;
+ int ret = nlmsg_parse(cb->nlh, GENL_HDRLEN + nl802154_fam.hdrsize,
+ tb, nl802154_fam.maxattr, nl802154_policy);
+
+ /* TODO check if we can handle error here,
+ * we have no backward compatibility
+ */
+ if (ret)
+ return 0;
+
+ if (tb[NL802154_ATTR_WPAN_PHY])
+ state->filter_wpan_phy = nla_get_u32(tb[NL802154_ATTR_WPAN_PHY]);
+ if (tb[NL802154_ATTR_WPAN_DEV])
+ state->filter_wpan_phy = nla_get_u64(tb[NL802154_ATTR_WPAN_DEV]) >> 32;
+ if (tb[NL802154_ATTR_IFINDEX]) {
+ struct net_device *netdev;
+ struct cfg802154_registered_device *rdev;
+ int ifidx = nla_get_u32(tb[NL802154_ATTR_IFINDEX]);
+
+ /* TODO netns */
+ netdev = __dev_get_by_index(&init_net, ifidx);
+ if (!netdev)
+ return -ENODEV;
+ if (netdev->ieee802154_ptr) {
+ rdev = wpan_phy_to_rdev(
+ netdev->ieee802154_ptr->wpan_phy);
+ state->filter_wpan_phy = rdev->wpan_phy_idx;
+ }
+ }
+
+ return 0;
+}
+
+static int
+nl802154_dump_wpan_phy(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ int idx = 0, ret;
+ struct nl802154_dump_wpan_phy_state *state = (void *)cb->args[0];
+ struct cfg802154_registered_device *rdev;
+
+ rtnl_lock();
+ if (!state) {
+ state = kzalloc(sizeof(*state), GFP_KERNEL);
+ if (!state) {
+ rtnl_unlock();
+ return -ENOMEM;
+ }
+ state->filter_wpan_phy = -1;
+ ret = nl802154_dump_wpan_phy_parse(skb, cb, state);
+ if (ret) {
+ kfree(state);
+ rtnl_unlock();
+ return ret;
+ }
+ cb->args[0] = (long)state;
+ }
+
+ list_for_each_entry(rdev, &cfg802154_rdev_list, list) {
+ /* TODO net ns compare */
+ if (++idx <= state->start)
+ continue;
+ if (state->filter_wpan_phy != -1 &&
+ state->filter_wpan_phy != rdev->wpan_phy_idx)
+ continue;
+ /* attempt to fit multiple wpan_phy data chunks into the skb */
+ ret = nl802154_send_wpan_phy(rdev,
+ NL802154_CMD_NEW_WPAN_PHY,
+ skb,
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq, NLM_F_MULTI);
+ if (ret < 0) {
+ if ((ret == -ENOBUFS || ret == -EMSGSIZE) &&
+ !skb->len && cb->min_dump_alloc < 4096) {
+ cb->min_dump_alloc = 4096;
+ rtnl_unlock();
+ return 1;
+ }
+ idx--;
+ break;
+ }
+ break;
+ }
+ rtnl_unlock();
+
+ state->start = idx;
+
+ return skb->len;
+}
+
+static int nl802154_dump_wpan_phy_done(struct netlink_callback *cb)
+{
+ kfree((void *)cb->args[0]);
+ return 0;
+}
+
+static int nl802154_get_wpan_phy(struct sk_buff *skb, struct genl_info *info)
+{
+ struct sk_buff *msg;
+ struct cfg802154_registered_device *rdev = info->user_ptr[0];
+
+ msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+ if (!msg)
+ return -ENOMEM;
+
+ if (nl802154_send_wpan_phy(rdev, NL802154_CMD_NEW_WPAN_PHY, msg,
+ info->snd_portid, info->snd_seq, 0) < 0) {
+ nlmsg_free(msg);
+ return -ENOBUFS;
+ }
+
+ return genlmsg_reply(msg, info);
+}
+
#define NL802154_FLAG_NEED_WPAN_PHY 0x01
#define NL802154_FLAG_NEED_NETDEV 0x02
#define NL802154_FLAG_NEED_RTNL 0x04
@@ -294,6 +505,16 @@ static void nl802154_post_doit(const struct genl_ops *ops, struct sk_buff *skb,
}
static const struct genl_ops nl802154_ops[] = {
+ {
+ .cmd = NL802154_CMD_GET_WPAN_PHY,
+ .doit = nl802154_get_wpan_phy,
+ .dumpit = nl802154_dump_wpan_phy,
+ .done = nl802154_dump_wpan_phy_done,
+ .policy = nl802154_policy,
+ /* can be retrieved by unprivileged users */
+ .internal_flags = NL802154_FLAG_NEED_WPAN_PHY |
+ NL802154_FLAG_NEED_RTNL,
+ },
};
/* initialisation/exit functions */
--
2.1.3
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