Add nl80211 commands to get and set o11s mesh networking parameters

The two new commands are NL80211_CMD_GET_MESH_PARAMS and
NL80211_CMD_SET_MESH_PARAMS. There is a new attribute enum,
NL80211_ATTR_MESH_PARAMS, which enumerates the various mesh configuration
parameters.

Moved struct mesh_config from mac80211/ieee80211_i.h to net/cfg80211.h.
nl80211_get_mesh_params and nl80211_set_mesh_params unpack the netlink messages
and ask the driver to get or set the configuration.  This is done via two new
function stubs, get_mesh_params and set_mesh_params, in struct cfg80211_ops.

Signed-off-by: Colin McCabe <colin@cozybit.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 191 insertions, 0 deletions

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 2b87aec231ea..9a16e9e6c5ca 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -96,6 +96,8 @@ static struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] __read_mostly = {
         [NL80211_ATTR_BSS_SHORT_PREAMBLE] = { .type = NLA_U8 },
         [NL80211_ATTR_BSS_SHORT_SLOT_TIME] = { .type = NLA_U8 },
 
+        [NL80211_ATTR_MESH_PARAMS] = { .type = NLA_NESTED },
+
         [NL80211_ATTR_HT_CAPABILITY] = { .type = NLA_BINARY,
                                          .len = NL80211_HT_CAPABILITY_LEN },
 };
@@ -1698,6 +1700,183 @@ static int nl80211_req_set_reg(struct sk_buff *skb, struct genl_info *info)
         return r;
 }
 
+static int nl80211_get_mesh_params(struct sk_buff *skb,
+        struct genl_info *info)
+{
+        struct cfg80211_registered_device *drv;
+        struct mesh_config cur_params;
+        int err;
+        struct net_device *dev;
+        void *hdr;
+        struct nlattr *pinfoattr;
+        struct sk_buff *msg;
+
+        /* Look up our device */
+        err = get_drv_dev_by_info_ifindex(info->attrs, &drv, &dev);
+        if (err)
+                return err;
+
+        /* Get the mesh params */
+        rtnl_lock();
+        err = drv->ops->get_mesh_params(&drv->wiphy, dev, &cur_params);
+        rtnl_unlock();
+        if (err)
+                goto out;
+
+        /* Draw up a netlink message to send back */
+        msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+        if (!msg) {
+                err = -ENOBUFS;
+                goto out;
+        }
+        hdr = nl80211hdr_put(msg, info->snd_pid, info->snd_seq, 0,
+                             NL80211_CMD_GET_MESH_PARAMS);
+        if (!hdr)
+                goto nla_put_failure;
+        pinfoattr = nla_nest_start(msg, NL80211_ATTR_MESH_PARAMS);
+        if (!pinfoattr)
+                goto nla_put_failure;
+        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, dev->ifindex);
+        NLA_PUT_U16(msg, NL80211_MESHCONF_RETRY_TIMEOUT,
+                        cur_params.dot11MeshRetryTimeout);
+        NLA_PUT_U16(msg, NL80211_MESHCONF_CONFIRM_TIMEOUT,
+                        cur_params.dot11MeshConfirmTimeout);
+        NLA_PUT_U16(msg, NL80211_MESHCONF_HOLDING_TIMEOUT,
+                        cur_params.dot11MeshHoldingTimeout);
+        NLA_PUT_U16(msg, NL80211_MESHCONF_MAX_PEER_LINKS,
+                        cur_params.dot11MeshMaxPeerLinks);
+        NLA_PUT_U8(msg, NL80211_MESHCONF_MAX_RETRIES,
+                        cur_params.dot11MeshMaxRetries);
+        NLA_PUT_U8(msg, NL80211_MESHCONF_TTL,
+                        cur_params.dot11MeshTTL);
+        NLA_PUT_U8(msg, NL80211_MESHCONF_AUTO_OPEN_PLINKS,
+                        cur_params.auto_open_plinks);
+        NLA_PUT_U8(msg, NL80211_MESHCONF_HWMP_MAX_PREQ_RETRIES,
+                        cur_params.dot11MeshHWMPmaxPREQretries);
+        NLA_PUT_U32(msg, NL80211_MESHCONF_PATH_REFRESH_TIME,
+                        cur_params.path_refresh_time);
+        NLA_PUT_U16(msg, NL80211_MESHCONF_MIN_DISCOVERY_TIMEOUT,
+                        cur_params.min_discovery_timeout);
+        NLA_PUT_U32(msg, NL80211_MESHCONF_HWMP_ACTIVE_PATH_TIMEOUT,
+                        cur_params.dot11MeshHWMPactivePathTimeout);
+        NLA_PUT_U16(msg, NL80211_MESHCONF_HWMP_PREQ_MIN_INTERVAL,
+                        cur_params.dot11MeshHWMPpreqMinInterval);
+        NLA_PUT_U16(msg, NL80211_MESHCONF_HWMP_NET_DIAM_TRVS_TIME,
+                        cur_params.dot11MeshHWMPnetDiameterTraversalTime);
+        nla_nest_end(msg, pinfoattr);
+        genlmsg_end(msg, hdr);
+        err = genlmsg_unicast(msg, info->snd_pid);
+        goto out;
+
+nla_put_failure:
+        genlmsg_cancel(msg, hdr);
+        err = -EMSGSIZE;
+out:
+        /* Cleanup */
+        cfg80211_put_dev(drv);
+        dev_put(dev);
+        return err;
+}
+
+#define FILL_IN_MESH_PARAM_IF_SET(table, cfg, param, mask, attr_num, nla_fn) \
+do {\
+        if (table[attr_num]) {\
+                cfg.param = nla_fn(table[attr_num]); \
+                mask |= (1 << (attr_num - 1)); \
+        } \
+} while (0);\
+
+static struct nla_policy
+nl80211_meshconf_params_policy[NL80211_MESHCONF_ATTR_MAX+1] __read_mostly = {
+        [NL80211_MESHCONF_RETRY_TIMEOUT] = { .type = NLA_U16 },
+        [NL80211_MESHCONF_CONFIRM_TIMEOUT] = { .type = NLA_U16 },
+        [NL80211_MESHCONF_HOLDING_TIMEOUT] = { .type = NLA_U16 },
+        [NL80211_MESHCONF_MAX_PEER_LINKS] = { .type = NLA_U16 },
+        [NL80211_MESHCONF_MAX_RETRIES] = { .type = NLA_U8 },
+        [NL80211_MESHCONF_TTL] = { .type = NLA_U8 },
+        [NL80211_MESHCONF_AUTO_OPEN_PLINKS] = { .type = NLA_U8 },
+
+        [NL80211_MESHCONF_HWMP_MAX_PREQ_RETRIES] = { .type = NLA_U8 },
+        [NL80211_MESHCONF_PATH_REFRESH_TIME] = { .type = NLA_U32 },
+        [NL80211_MESHCONF_MIN_DISCOVERY_TIMEOUT] = { .type = NLA_U16 },
+        [NL80211_MESHCONF_HWMP_ACTIVE_PATH_TIMEOUT] = { .type = NLA_U32 },
+        [NL80211_MESHCONF_HWMP_PREQ_MIN_INTERVAL] = { .type = NLA_U16 },
+        [NL80211_MESHCONF_HWMP_NET_DIAM_TRVS_TIME] = { .type = NLA_U16 },
+};
+
+static int nl80211_set_mesh_params(struct sk_buff *skb, struct genl_info *info)
+{
+        int err;
+        u32 mask;
+        struct cfg80211_registered_device *drv;
+        struct net_device *dev;
+        struct mesh_config cfg;
+        struct nlattr *tb[NL80211_MESHCONF_ATTR_MAX + 1];
+        struct nlattr *parent_attr;
+
+        parent_attr = info->attrs[NL80211_ATTR_MESH_PARAMS];
+        if (!parent_attr)
+                return -EINVAL;
+        if (nla_parse_nested(tb, NL80211_MESHCONF_ATTR_MAX,
+                        parent_attr, nl80211_meshconf_params_policy))
+                return -EINVAL;
+
+        err = get_drv_dev_by_info_ifindex(info->attrs, &drv, &dev);
+        if (err)
+                return err;
+
+        /* This makes sure that there aren't more than 32 mesh config
+         * parameters (otherwise our bitfield scheme would not work.) */
+        BUILD_BUG_ON(NL80211_MESHCONF_ATTR_MAX > 32);
+
+        /* Fill in the params struct */
+        mask = 0;
+        FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshRetryTimeout,
+                        mask, NL80211_MESHCONF_RETRY_TIMEOUT, nla_get_u16);
+        FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshConfirmTimeout,
+                        mask, NL80211_MESHCONF_CONFIRM_TIMEOUT, nla_get_u16);
+        FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshHoldingTimeout,
+                        mask, NL80211_MESHCONF_HOLDING_TIMEOUT, nla_get_u16);
+        FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshMaxPeerLinks,
+                        mask, NL80211_MESHCONF_MAX_PEER_LINKS, nla_get_u16);
+        FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshMaxRetries,
+                        mask, NL80211_MESHCONF_MAX_RETRIES, nla_get_u8);
+        FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshTTL,
+                        mask, NL80211_MESHCONF_TTL, nla_get_u8);
+        FILL_IN_MESH_PARAM_IF_SET(tb, cfg, auto_open_plinks,
+                        mask, NL80211_MESHCONF_AUTO_OPEN_PLINKS, nla_get_u8);
+        FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshHWMPmaxPREQretries,
+                        mask, NL80211_MESHCONF_HWMP_MAX_PREQ_RETRIES,
+                        nla_get_u8);
+        FILL_IN_MESH_PARAM_IF_SET(tb, cfg, path_refresh_time,
+                        mask, NL80211_MESHCONF_PATH_REFRESH_TIME, nla_get_u32);
+        FILL_IN_MESH_PARAM_IF_SET(tb, cfg, min_discovery_timeout,
+                        mask, NL80211_MESHCONF_MIN_DISCOVERY_TIMEOUT,
+                        nla_get_u16);
+        FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshHWMPactivePathTimeout,
+                        mask, NL80211_MESHCONF_HWMP_ACTIVE_PATH_TIMEOUT,
+                        nla_get_u32);
+        FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshHWMPpreqMinInterval,
+                        mask, NL80211_MESHCONF_HWMP_PREQ_MIN_INTERVAL,
+                        nla_get_u16);
+        FILL_IN_MESH_PARAM_IF_SET(tb, cfg,
+                        dot11MeshHWMPnetDiameterTraversalTime,
+                        mask, NL80211_MESHCONF_HWMP_NET_DIAM_TRVS_TIME,
+                        nla_get_u16);
+
+        /* Apply changes */
+        rtnl_lock();
+        err = drv->ops->set_mesh_params(&drv->wiphy, dev, &cfg, mask);
+        rtnl_unlock();
+
+        /* cleanup */
+        cfg80211_put_dev(drv);
+        dev_put(dev);
+        return err;
+}
+
+#undef FILL_IN_MESH_PARAM_IF_SET
+
 static int nl80211_set_reg(struct sk_buff *skb, struct genl_info *info)
 {
         struct nlattr *tb[NL80211_REG_RULE_ATTR_MAX + 1];
@@ -1915,6 +2094,18 @@ static struct genl_ops nl80211_ops[] = {
                 .policy = nl80211_policy,
                 .flags = GENL_ADMIN_PERM,
         },
+        {
+                .cmd = NL80211_CMD_GET_MESH_PARAMS,
+                .doit = nl80211_get_mesh_params,
+                .policy = nl80211_policy,
+                /* can be retrieved by unprivileged users */
+        },
+        {
+                .cmd = NL80211_CMD_SET_MESH_PARAMS,
+                .doit = nl80211_set_mesh_params,
+                .policy = nl80211_policy,
+                .flags = GENL_ADMIN_PERM,
+        },
 };
 
 /* multicast groups */