5 files changed, 174 insertions, 19 deletions

diff --git a/net/nfc/llcp/commands.c b/net/nfc/llcp/commands.c
index 79415353cc28..ed2d17312d61 100644
--- a/net/nfc/llcp/commands.c
+++ b/net/nfc/llcp/commands.c
@@ -316,8 +316,7 @@ int nfc_llcp_send_connect(struct nfc_llcp_sock *sock)
         struct sk_buff *skb;
         u8 *service_name_tlv = NULL, service_name_tlv_length;
         u8 *miux_tlv = NULL, miux_tlv_length;
-        u8 *rw_tlv = NULL, rw_tlv_length, rw;
-        __be16 miux;
+        u8 *rw_tlv = NULL, rw_tlv_length;
         int err;
         u16 size = 0;
 
@@ -335,13 +334,11 @@ int nfc_llcp_send_connect(struct nfc_llcp_sock *sock)
                 size += service_name_tlv_length;
         }
 
-        miux = cpu_to_be16(LLCP_MAX_MIUX);
-        miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0,
+        miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
                                       &miux_tlv_length);
         size += miux_tlv_length;
 
-        rw = LLCP_MAX_RW;
-        rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length);
+        rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &local->rw, 0, &rw_tlv_length);
         size += rw_tlv_length;
 
         pr_debug("SKB size %d SN length %zu\n", size, sock->service_name_len);
@@ -378,8 +375,7 @@ int nfc_llcp_send_cc(struct nfc_llcp_sock *sock)
         struct nfc_llcp_local *local;
         struct sk_buff *skb;
         u8 *miux_tlv = NULL, miux_tlv_length;
-        u8 *rw_tlv = NULL, rw_tlv_length, rw;
-        __be16 miux;
+        u8 *rw_tlv = NULL, rw_tlv_length;
         int err;
         u16 size = 0;
 
@@ -389,13 +385,11 @@ int nfc_llcp_send_cc(struct nfc_llcp_sock *sock)
         if (local == NULL)
                 return -ENODEV;
 
-        miux = cpu_to_be16(LLCP_MAX_MIUX);
-        miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0,
+        miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
                                       &miux_tlv_length);
         size += miux_tlv_length;
 
-        rw = LLCP_MAX_RW;
-        rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length);
+        rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &local->rw, 0, &rw_tlv_length);
         size += rw_tlv_length;
 
         skb = llcp_allocate_pdu(sock, LLCP_PDU_CC, size);
diff --git a/net/nfc/llcp/llcp.c b/net/nfc/llcp/llcp.c
index 2e23bd348ebd..f6804532047a 100644
--- a/net/nfc/llcp/llcp.c
+++ b/net/nfc/llcp/llcp.c
@@ -467,10 +467,9 @@ static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local)
 static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
 {
         u8 *gb_cur, *version_tlv, version, version_length;
-        u8 *lto_tlv, lto, lto_length;
+        u8 *lto_tlv, lto_length;
         u8 *wks_tlv, wks_length;
         u8 *miux_tlv, miux_length;
-        __be16 miux;
         u8 gb_len = 0;
         int ret = 0;
 
@@ -479,9 +478,7 @@ static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
                                          1, &version_length);
         gb_len += version_length;
 
-        /* 1500 ms */
-        lto = 150;
-        lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &lto, 1, &lto_length);
+        lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, &lto_length);
         gb_len += lto_length;
 
         pr_debug("Local wks 0x%lx\n", local->local_wks);
@@ -489,8 +486,7 @@ static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
                                      &wks_length);
         gb_len += wks_length;
 
-        miux = cpu_to_be16(LLCP_MAX_MIUX);
-        miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0,
+        miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
                                       &miux_length);
         gb_len += miux_length;
 
@@ -1383,6 +1379,10 @@ int nfc_llcp_register_device(struct nfc_dev *ndev)
         rwlock_init(&local->connecting_sockets.lock);
         rwlock_init(&local->raw_sockets.lock);
 
+        local->lto = 150; /* 1500 ms */
+        local->rw = LLCP_MAX_RW;
+        local->miux = cpu_to_be16(LLCP_MAX_MIUX);
+
         nfc_llcp_build_gb(local);
 
         local->remote_miu = LLCP_DEFAULT_MIU;
diff --git a/net/nfc/llcp/llcp.h b/net/nfc/llcp/llcp.h
index 276da3a6a589..0d62366f8cc3 100644
--- a/net/nfc/llcp/llcp.h
+++ b/net/nfc/llcp/llcp.h
@@ -64,6 +64,9 @@ struct nfc_llcp_local {
         u32 target_idx;
         u8 rf_mode;
         u8 comm_mode;
+        u8 lto;
+        u8 rw;
+        __be16 miux;
         unsigned long local_wks;      /* Well known services */
         unsigned long local_sdp;      /* Local services  */
         unsigned long local_sap; /* Local SAPs, not available for discovery */
diff --git a/net/nfc/netlink.c b/net/nfc/netlink.c
index 614cfd0470b7..3568ae16786d 100644
--- a/net/nfc/netlink.c
+++ b/net/nfc/netlink.c
@@ -29,6 +29,8 @@
 
 #include "nfc.h"
 
+#include "llcp/llcp.h"
+
 static struct genl_multicast_group nfc_genl_event_mcgrp = {
         .name = NFC_GENL_MCAST_EVENT_NAME,
 };
@@ -716,6 +718,146 @@ static int nfc_genl_dep_link_down(struct sk_buff *skb, struct genl_info *info)
         return rc;
 }
 
+static int nfc_genl_send_params(struct sk_buff *msg,
+                                struct nfc_llcp_local *local,
+                                u32 portid, u32 seq)
+{
+        void *hdr;
+
+        hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, 0,
+                          NFC_CMD_LLC_GET_PARAMS);
+        if (!hdr)
+                return -EMSGSIZE;
+
+        if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, local->dev->idx) ||
+            nla_put_u8(msg, NFC_ATTR_LLC_PARAM_LTO, local->lto) ||
+            nla_put_u8(msg, NFC_ATTR_LLC_PARAM_RW, local->rw) ||
+            nla_put_u16(msg, NFC_ATTR_LLC_PARAM_MIUX, be16_to_cpu(local->miux)))
+                goto nla_put_failure;
+
+        return genlmsg_end(msg, hdr);
+
+nla_put_failure:
+
+        genlmsg_cancel(msg, hdr);
+        return -EMSGSIZE;
+}
+
+static int nfc_genl_llc_get_params(struct sk_buff *skb, struct genl_info *info)
+{
+        struct nfc_dev *dev;
+        struct nfc_llcp_local *local;
+        int rc = 0;
+        struct sk_buff *msg = NULL;
+        u32 idx;
+
+        if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
+                return -EINVAL;
+
+        idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
+
+        dev = nfc_get_device(idx);
+        if (!dev)
+                return -ENODEV;
+
+        device_lock(&dev->dev);
+
+        local = nfc_llcp_find_local(dev);
+        if (!local) {
+                rc = -ENODEV;
+                goto exit;
+        }
+
+        msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+        if (!msg) {
+                rc = -ENOMEM;
+                goto exit;
+        }
+
+        rc = nfc_genl_send_params(msg, local, info->snd_portid, info->snd_seq);
+
+exit:
+        device_unlock(&dev->dev);
+
+        nfc_put_device(dev);
+
+        if (rc < 0) {
+                if (msg)
+                        nlmsg_free(msg);
+
+                return rc;
+        }
+
+        return genlmsg_reply(msg, info);
+}
+
+static int nfc_genl_llc_set_params(struct sk_buff *skb, struct genl_info *info)
+{
+        struct nfc_dev *dev;
+        struct nfc_llcp_local *local;
+        u8 rw = 0;
+        u16 miux = 0;
+        u32 idx;
+        int rc = 0;
+
+        if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
+            (!info->attrs[NFC_ATTR_LLC_PARAM_LTO] &&
+             !info->attrs[NFC_ATTR_LLC_PARAM_RW] &&
+             !info->attrs[NFC_ATTR_LLC_PARAM_MIUX]))
+                return -EINVAL;
+
+        if (info->attrs[NFC_ATTR_LLC_PARAM_RW]) {
+                rw = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_RW]);
+
+                if (rw > LLCP_MAX_RW)
+                        return -EINVAL;
+        }
+
+        if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX]) {
+                miux = nla_get_u16(info->attrs[NFC_ATTR_LLC_PARAM_MIUX]);
+
+                if (miux > LLCP_MAX_MIUX)
+                        return -EINVAL;
+        }
+
+        idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
+
+        dev = nfc_get_device(idx);
+        if (!dev)
+                return -ENODEV;
+
+        device_lock(&dev->dev);
+
+        local = nfc_llcp_find_local(dev);
+        if (!local) {
+                nfc_put_device(dev);
+                rc = -ENODEV;
+                goto exit;
+        }
+
+        if (info->attrs[NFC_ATTR_LLC_PARAM_LTO]) {
+                if (dev->dep_link_up) {
+                        rc = -EINPROGRESS;
+                        goto exit;
+                }
+
+                local->lto = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_LTO]);
+        }
+
+        if (info->attrs[NFC_ATTR_LLC_PARAM_RW])
+                local->rw = rw;
+
+        if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX])
+                local->miux = cpu_to_be16(miux);
+
+exit:
+        device_unlock(&dev->dev);
+
+        nfc_put_device(dev);
+
+        return rc;
+}
+
 static struct genl_ops nfc_genl_ops[] = {
         {
                 .cmd = NFC_CMD_GET_DEVICE,
@@ -760,6 +902,16 @@ static struct genl_ops nfc_genl_ops[] = {
                 .done = nfc_genl_dump_targets_done,
                 .policy = nfc_genl_policy,
         },
+        {
+                .cmd = NFC_CMD_LLC_GET_PARAMS,
+                .doit = nfc_genl_llc_get_params,
+                .policy = nfc_genl_policy,
+        },
+        {
+                .cmd = NFC_CMD_LLC_SET_PARAMS,
+                .doit = nfc_genl_llc_set_params,
+                .policy = nfc_genl_policy,
+        },
 };
 
 
diff --git a/net/nfc/nfc.h b/net/nfc/nfc.h
index c5e42b79a418..87d914d2876a 100644
--- a/net/nfc/nfc.h
+++ b/net/nfc/nfc.h
@@ -56,6 +56,7 @@ void nfc_llcp_unregister_device(struct nfc_dev *dev);
 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len);
 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len);
 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb);
+struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev);
 int __init nfc_llcp_init(void);
 void nfc_llcp_exit(void);
 
@@ -97,6 +98,11 @@ static inline int nfc_llcp_data_received(struct nfc_dev *dev,
         return 0;
 }
 
+static inline struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
+{
+        return NULL;
+}
+
 static inline int nfc_llcp_init(void)
 {
         return 0;