summaryrefslogtreecommitdiff
path: root/net/nfc/digital_dep.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/nfc/digital_dep.c')
-rw-r--r--net/nfc/digital_dep.c108
1 files changed, 98 insertions, 10 deletions
diff --git a/net/nfc/digital_dep.c b/net/nfc/digital_dep.c
index 95a69898d5f5..b78790088b8e 100644
--- a/net/nfc/digital_dep.c
+++ b/net/nfc/digital_dep.c
@@ -34,9 +34,12 @@
#define DIGITAL_DID_MAX 14
-#define DIGITAL_LR_BITS_PAYLOAD_SIZE_254B 0x30
-#define DIGITAL_FSL_BITS_PAYLOAD_SIZE_254B \
- (DIGITAL_LR_BITS_PAYLOAD_SIZE_254B >> 4)
+#define DIGITAL_PAYLOAD_SIZE_MAX 254
+#define DIGITAL_PAYLOAD_BITS_TO_PP(s) (((s) & 0x3) << 4)
+#define DIGITAL_PAYLOAD_PP_TO_BITS(s) (((s) >> 4) & 0x3)
+#define DIGITAL_PAYLOAD_BITS_TO_FSL(s) ((s) & 0x3)
+#define DIGITAL_PAYLOAD_FSL_TO_BITS(s) ((s) & 0x3)
+
#define DIGITAL_GB_BIT 0x02
#define DIGITAL_NFC_DEP_PFB_TYPE(pfb) ((pfb) & 0xE0)
@@ -101,6 +104,32 @@ struct digital_dep_req_res {
static void digital_in_recv_dep_res(struct nfc_digital_dev *ddev, void *arg,
struct sk_buff *resp);
+static const u8 digital_payload_bits_map[4] = {
+ [0] = 64,
+ [1] = 128,
+ [2] = 192,
+ [3] = 254
+};
+
+static u8 digital_payload_bits_to_size(u8 payload_bits)
+{
+ if (payload_bits >= ARRAY_SIZE(digital_payload_bits_map))
+ return 0;
+
+ return digital_payload_bits_map[payload_bits];
+}
+
+static u8 digital_payload_size_to_bits(u8 payload_size)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(digital_payload_bits_map); i++)
+ if (digital_payload_bits_map[i] == payload_size)
+ return i;
+
+ return 0xff;
+}
+
static void digital_skb_push_dep_sod(struct nfc_digital_dev *ddev,
struct sk_buff *skb)
{
@@ -202,6 +231,7 @@ static int digital_in_send_psl_req(struct nfc_digital_dev *ddev,
struct sk_buff *skb;
struct digital_psl_req *psl_req;
int rc;
+ u8 payload_size, payload_bits;
skb = digital_skb_alloc(ddev, sizeof(*psl_req));
if (!skb)
@@ -215,7 +245,13 @@ static int digital_in_send_psl_req(struct nfc_digital_dev *ddev,
psl_req->cmd = DIGITAL_CMD_PSL_REQ;
psl_req->did = 0;
psl_req->brs = (0x2 << 3) | 0x2; /* 424F both directions */
- psl_req->fsl = DIGITAL_FSL_BITS_PAYLOAD_SIZE_254B;
+
+ payload_size = min(ddev->local_payload_max, ddev->remote_payload_max);
+ payload_bits = digital_payload_size_to_bits(payload_size);
+ psl_req->fsl = DIGITAL_PAYLOAD_BITS_TO_FSL(payload_bits);
+
+ ddev->local_payload_max = payload_size;
+ ddev->remote_payload_max = payload_size;
digital_skb_push_dep_sod(ddev, skb);
@@ -234,7 +270,7 @@ static void digital_in_recv_atr_res(struct nfc_digital_dev *ddev, void *arg,
{
struct nfc_target *target = arg;
struct digital_atr_res *atr_res;
- u8 gb_len;
+ u8 gb_len, payload_bits;
int rc;
if (IS_ERR(resp)) {
@@ -264,6 +300,14 @@ static void digital_in_recv_atr_res(struct nfc_digital_dev *ddev, void *arg,
atr_res = (struct digital_atr_res *)resp->data;
+ payload_bits = DIGITAL_PAYLOAD_PP_TO_BITS(atr_res->pp);
+ ddev->remote_payload_max = digital_payload_bits_to_size(payload_bits);
+
+ if (!ddev->remote_payload_max) {
+ rc = -EINVAL;
+ goto exit;
+ }
+
rc = nfc_set_remote_general_bytes(ddev->nfc_dev, atr_res->gb, gb_len);
if (rc)
goto exit;
@@ -295,6 +339,7 @@ int digital_in_send_atr_req(struct nfc_digital_dev *ddev,
struct digital_atr_req *atr_req;
uint size;
int rc;
+ u8 payload_bits;
size = DIGITAL_ATR_REQ_MIN_SIZE + gb_len;
@@ -323,7 +368,9 @@ int digital_in_send_atr_req(struct nfc_digital_dev *ddev,
atr_req->bs = 0;
atr_req->br = 0;
- atr_req->pp = DIGITAL_LR_BITS_PAYLOAD_SIZE_254B;
+ ddev->local_payload_max = DIGITAL_PAYLOAD_SIZE_MAX;
+ payload_bits = digital_payload_size_to_bits(ddev->local_payload_max);
+ atr_req->pp = DIGITAL_PAYLOAD_BITS_TO_PP(payload_bits);
if (gb_len) {
atr_req->pp |= DIGITAL_GB_BIT;
@@ -403,6 +450,11 @@ static void digital_in_recv_dep_res(struct nfc_digital_dev *ddev, void *arg,
goto exit;
}
+ if (resp->len > ddev->local_payload_max) {
+ rc = -EMSGSIZE;
+ goto exit;
+ }
+
size = sizeof(struct digital_dep_req_res);
dep_res = (struct digital_dep_req_res *)resp->data;
@@ -498,6 +550,9 @@ int digital_in_send_dep_req(struct nfc_digital_dev *ddev,
skb_push(skb, sizeof(struct digital_dep_req_res));
+ if (skb->len > ddev->remote_payload_max)
+ return -EMSGSIZE;
+
dep_req = (struct digital_dep_req_res *)skb->data;
dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT;
dep_req->cmd = DIGITAL_CMD_DEP_REQ;
@@ -564,6 +619,11 @@ static void digital_tg_recv_dep_req(struct nfc_digital_dev *ddev, void *arg,
goto exit;
}
+ if (resp->len > ddev->local_payload_max) {
+ rc = -EMSGSIZE;
+ goto exit;
+ }
+
size = sizeof(struct digital_dep_req_res);
dep_req = (struct digital_dep_req_res *)resp->data;
@@ -639,6 +699,10 @@ int digital_tg_send_dep_res(struct nfc_digital_dev *ddev, struct sk_buff *skb)
struct digital_dep_req_res *dep_res;
skb_push(skb, sizeof(struct digital_dep_req_res));
+
+ if (skb->len > ddev->remote_payload_max)
+ return -EMSGSIZE;
+
dep_res = (struct digital_dep_req_res *)skb->data;
dep_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN;
@@ -719,7 +783,7 @@ static void digital_tg_recv_psl_req(struct nfc_digital_dev *ddev, void *arg,
int rc;
struct digital_psl_req *psl_req;
u8 rf_tech;
- u8 dsi;
+ u8 dsi, payload_size, payload_bits;
if (IS_ERR(resp)) {
rc = PTR_ERR(resp);
@@ -764,6 +828,18 @@ static void digital_tg_recv_psl_req(struct nfc_digital_dev *ddev, void *arg,
goto exit;
}
+ payload_bits = DIGITAL_PAYLOAD_FSL_TO_BITS(psl_req->fsl);
+ payload_size = digital_payload_bits_to_size(payload_bits);
+
+ if (!payload_size || (payload_size > min(ddev->local_payload_max,
+ ddev->remote_payload_max))) {
+ rc = -EINVAL;
+ goto exit;
+ }
+
+ ddev->local_payload_max = payload_size;
+ ddev->remote_payload_max = payload_size;
+
rc = digital_tg_send_psl_res(ddev, psl_req->did, rf_tech);
exit:
@@ -795,7 +871,7 @@ static int digital_tg_send_atr_res(struct nfc_digital_dev *ddev,
{
struct digital_atr_res *atr_res;
struct sk_buff *skb;
- u8 *gb;
+ u8 *gb, payload_bits;
size_t gb_len;
int rc;
@@ -816,7 +892,11 @@ static int digital_tg_send_atr_res(struct nfc_digital_dev *ddev,
atr_res->cmd = DIGITAL_CMD_ATR_RES;
memcpy(atr_res->nfcid3, atr_req->nfcid3, sizeof(atr_req->nfcid3));
atr_res->to = 8;
- atr_res->pp = DIGITAL_LR_BITS_PAYLOAD_SIZE_254B;
+
+ ddev->local_payload_max = DIGITAL_PAYLOAD_SIZE_MAX;
+ payload_bits = digital_payload_size_to_bits(ddev->local_payload_max);
+ atr_res->pp = DIGITAL_PAYLOAD_BITS_TO_PP(payload_bits);
+
if (gb_len) {
skb_put(skb, gb_len);
@@ -844,7 +924,7 @@ void digital_tg_recv_atr_req(struct nfc_digital_dev *ddev, void *arg,
int rc;
struct digital_atr_req *atr_req;
size_t gb_len, min_size;
- u8 poll_tech_count;
+ u8 poll_tech_count, payload_bits;
if (IS_ERR(resp)) {
rc = PTR_ERR(resp);
@@ -893,6 +973,14 @@ void digital_tg_recv_atr_req(struct nfc_digital_dev *ddev, void *arg,
goto exit;
}
+ payload_bits = DIGITAL_PAYLOAD_PP_TO_BITS(atr_req->pp);
+ ddev->remote_payload_max = digital_payload_bits_to_size(payload_bits);
+
+ if (!ddev->remote_payload_max) {
+ rc = -EINVAL;
+ goto exit;
+ }
+
ddev->did = atr_req->did;
rc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-11 05:19:40 +0000