Bluetooth: Add support for Segmentation and Reassembly of SDUs

ERTM should use Segmentation and Reassembly to break down a SDU in many
PDUs on sending data to the other side.

On sending packets we queue all 'segments' until end of segmentation and
just the add them to the queue for sending. On receiving we create a new
SKB with the SDU reassembled.

Initially based on a patch from Nathan Holstein <nathan@lampreynetworks.com>

Signed-off-by: Gustavo F. Padovan <gustavo@las.ic.unicamp.br>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

2 files changed, 162 insertions, 17 deletions

diff --git a/include/net/bluetooth/l2cap.h b/include/net/bluetooth/l2cap.h
index 9bbfbe74d400..0afde8d22b56 100644
--- a/include/net/bluetooth/l2cap.h
+++ b/include/net/bluetooth/l2cap.h
@@ -34,7 +34,7 @@
 #define L2CAP_DEFAULT_MAX_RECEIVE       1
 #define L2CAP_DEFAULT_RETRANS_TO        300    /* 300 milliseconds */
 #define L2CAP_DEFAULT_MONITOR_TO        1000   /* 1 second */
-#define L2CAP_DEFAULT_MAX_RX_APDU       0xfff7
+#define L2CAP_DEFAULT_MAX_PDU_SIZE      672
 
 #define L2CAP_CONN_TIMEOUT      (40000) /* 40 seconds */
 #define L2CAP_INFO_TIMEOUT      (4000)  /*  4 seconds */
@@ -311,6 +311,7 @@ struct l2cap_pinfo {
         __u8            conf_req[64];
         __u8            conf_len;
         __u8            conf_state;
+        __u8            conn_state;
 
         __u8            next_tx_seq;
         __u8            expected_ack_seq;
@@ -318,6 +319,9 @@ struct l2cap_pinfo {
         __u8            expected_tx_seq;
         __u8            unacked_frames;
         __u8            num_to_ack;
+        __u16           sdu_len;
+        __u16           partial_sdu_len;
+        struct sk_buff  *sdu;
 
         __u8            ident;
 
@@ -346,6 +350,8 @@ struct l2cap_pinfo {
 #define L2CAP_CONF_MAX_CONF_REQ 2
 #define L2CAP_CONF_MAX_CONF_RSP 2
 
+#define L2CAP_CONN_SAR_SDU         0x01
+
 static inline int l2cap_tx_window_full(struct sock *sk)
 {
         struct l2cap_pinfo *pi = l2cap_pi(sk);
@@ -363,6 +369,7 @@ static inline int l2cap_tx_window_full(struct sock *sk)
 #define __get_reqseq(ctrl) ((ctrl) & L2CAP_CTRL_REQSEQ) >> 8
 #define __is_iframe(ctrl) !((ctrl) & L2CAP_CTRL_FRAME_TYPE)
 #define __is_sframe(ctrl) (ctrl) & L2CAP_CTRL_FRAME_TYPE
+#define __is_sar_start(ctrl) ((ctrl) & L2CAP_CTRL_SAR) == L2CAP_SDU_START
 
 void l2cap_load(void);
 
diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c
index 45b8697a7398..167e02532697 100644
--- a/net/bluetooth/l2cap.c
+++ b/net/bluetooth/l2cap.c
@@ -1334,7 +1334,7 @@ static struct sk_buff *l2cap_create_basic_pdu(struct sock *sk, struct msghdr *ms
         return skb;
 }
 
-static struct sk_buff *l2cap_create_ertm_pdu(struct sock *sk, struct msghdr *msg, size_t len, u16 control)
+static struct sk_buff *l2cap_create_ertm_pdu(struct sock *sk, struct msghdr *msg, size_t len, u16 control, u16 sdulen)
 {
         struct l2cap_conn *conn = l2cap_pi(sk)->conn;
         struct sk_buff *skb;
@@ -1343,6 +1343,9 @@ static struct sk_buff *l2cap_create_ertm_pdu(struct sock *sk, struct msghdr *msg
 
         BT_DBG("sk %p len %d", sk, (int)len);
 
+        if (sdulen)
+                hlen += 2;
+
         count = min_t(unsigned int, (conn->mtu - hlen), len);
         skb = bt_skb_send_alloc(sk, count + hlen,
                         msg->msg_flags & MSG_DONTWAIT, &err);
@@ -1354,6 +1357,8 @@ static struct sk_buff *l2cap_create_ertm_pdu(struct sock *sk, struct msghdr *msg
         lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid);
         lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
         put_unaligned_le16(control, skb_put(skb, 2));
+        if (sdulen)
+                put_unaligned_le16(sdulen, skb_put(skb, 2));
 
         err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
         if (unlikely(err < 0)) {
@@ -1363,6 +1368,54 @@ static struct sk_buff *l2cap_create_ertm_pdu(struct sock *sk, struct msghdr *msg
         return skb;
 }
 
+static inline int l2cap_sar_segment_sdu(struct sock *sk, struct msghdr *msg, size_t len)
+{
+        struct l2cap_pinfo *pi = l2cap_pi(sk);
+        struct sk_buff *skb;
+        struct sk_buff_head sar_queue;
+        u16 control;
+        size_t size = 0;
+
+        __skb_queue_head_init(&sar_queue);
+        control = L2CAP_SDU_START;
+        skb = l2cap_create_ertm_pdu(sk, msg, pi->max_pdu_size, control, len);
+        if (IS_ERR(skb))
+                return PTR_ERR(skb);
+
+        __skb_queue_tail(&sar_queue, skb);
+        len -= pi->max_pdu_size;
+        size +=pi->max_pdu_size;
+        control = 0;
+
+        while (len > 0) {
+                size_t buflen;
+
+                if (len > pi->max_pdu_size) {
+                        control |= L2CAP_SDU_CONTINUE;
+                        buflen = pi->max_pdu_size;
+                } else {
+                        control |= L2CAP_SDU_END;
+                        buflen = len;
+                }
+
+                skb = l2cap_create_ertm_pdu(sk, msg, buflen, control, 0);
+                if (IS_ERR(skb)) {
+                        skb_queue_purge(&sar_queue);
+                        return PTR_ERR(skb);
+                }
+
+                __skb_queue_tail(&sar_queue, skb);
+                len -= buflen;
+                size += buflen;
+                control = 0;
+        }
+        skb_queue_splice_tail(&sar_queue, TX_QUEUE(sk));
+        if (sk->sk_send_head == NULL)
+                sk->sk_send_head = sar_queue.next;
+
+        return size;
+}
+
 static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len)
 {
         struct sock *sk = sock->sk;
@@ -1415,21 +1468,22 @@ static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct ms
 
         case L2CAP_MODE_ERTM:
                 /* Entire SDU fits into one PDU */
-                if (len <= pi->omtu) {
+                if (len <= pi->max_pdu_size) {
                         control = L2CAP_SDU_UNSEGMENTED;
-                        skb = l2cap_create_ertm_pdu(sk, msg, len, control);
+                        skb = l2cap_create_ertm_pdu(sk, msg, len, control, 0);
                         if (IS_ERR(skb)) {
                                 err = PTR_ERR(skb);
                                 goto done;
                         }
+                        __skb_queue_tail(TX_QUEUE(sk), skb);
+                        if (sk->sk_send_head == NULL)
+                                sk->sk_send_head = skb;
                 } else {
-                        /* FIXME: Segmentation will be added later */
-                        err = -EINVAL;
-                        goto done;
+                /* Segment SDU into multiples PDUs */
+                        err = l2cap_sar_segment_sdu(sk, msg, len);
+                        if (err < 0)
+                                goto done;
                 }
-                __skb_queue_tail(TX_QUEUE(sk), skb);
-                if (sk->sk_send_head == NULL)
-                        sk->sk_send_head = skb;
 
                 err = l2cap_ertm_send(sk);
                 if (!err)
@@ -2007,7 +2061,7 @@ done:
                 rfc.max_transmit    = L2CAP_DEFAULT_MAX_RECEIVE;
                 rfc.retrans_timeout = 0;
                 rfc.monitor_timeout = 0;
-                rfc.max_pdu_size    = cpu_to_le16(L2CAP_DEFAULT_MAX_RX_APDU);
+                rfc.max_pdu_size    = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE);
 
                 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
                                         sizeof(rfc), (unsigned long) &rfc);
@@ -2019,7 +2073,7 @@ done:
                 rfc.max_transmit    = 0;
                 rfc.retrans_timeout = 0;
                 rfc.monitor_timeout = 0;
-                rfc.max_pdu_size    = cpu_to_le16(L2CAP_DEFAULT_MAX_RX_APDU);
+                rfc.max_pdu_size    = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE);
 
                 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
                                         sizeof(rfc), (unsigned long) &rfc);
@@ -2808,6 +2862,86 @@ static inline void l2cap_sig_channel(struct l2cap_conn *conn, struct sk_buff *sk
         kfree_skb(skb);
 }
 
+static int l2cap_sar_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control)
+{
+        struct l2cap_pinfo *pi = l2cap_pi(sk);
+        struct sk_buff *_skb;
+        int err = -EINVAL;
+
+        switch (control & L2CAP_CTRL_SAR) {
+        case L2CAP_SDU_UNSEGMENTED:
+                if (pi->conn_state & L2CAP_CONN_SAR_SDU) {
+                        kfree_skb(pi->sdu);
+                        break;
+                }
+
+                err = sock_queue_rcv_skb(sk, skb);
+                if (!err)
+                        return 0;
+
+                break;
+
+        case L2CAP_SDU_START:
+                if (pi->conn_state & L2CAP_CONN_SAR_SDU) {
+                        kfree_skb(pi->sdu);
+                        break;
+                }
+
+                pi->sdu_len = get_unaligned_le16(skb->data);
+                skb_pull(skb, 2);
+
+                pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC);
+                if (!pi->sdu) {
+                        err = -ENOMEM;
+                        break;
+                }
+
+                memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
+
+                pi->conn_state |= L2CAP_CONN_SAR_SDU;
+                pi->partial_sdu_len = skb->len;
+                err = 0;
+                break;
+
+        case L2CAP_SDU_CONTINUE:
+                if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
+                        break;
+
+                memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
+
+                pi->partial_sdu_len += skb->len;
+                if (pi->partial_sdu_len > pi->sdu_len)
+                        kfree_skb(pi->sdu);
+                else
+                        err = 0;
+
+                break;
+
+        case L2CAP_SDU_END:
+                if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
+                        break;
+
+                memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
+
+                pi->conn_state &= ~L2CAP_CONN_SAR_SDU;
+                pi->partial_sdu_len += skb->len;
+
+                if (pi->partial_sdu_len == pi->sdu_len) {
+                        _skb = skb_clone(pi->sdu, GFP_ATOMIC);
+                        err = sock_queue_rcv_skb(sk, _skb);
+                        if (err < 0)
+                                kfree_skb(_skb);
+                }
+                kfree_skb(pi->sdu);
+                err = 0;
+
+                break;
+        }
+
+        kfree_skb(skb);
+        return err;
+}
+
 static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, struct sk_buff *skb)
 {
         struct l2cap_pinfo *pi = l2cap_pi(sk);
@@ -2820,11 +2954,11 @@ static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, str
         if (tx_seq != pi->expected_tx_seq)
                 return -EINVAL;
 
-        pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
-        err = sock_queue_rcv_skb(sk, skb);
-        if (err)
+        err = l2cap_sar_reassembly_sdu(sk, skb, rx_control);
+        if (err < 0)
                 return err;
 
+        pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
         pi->num_to_ack = (pi->num_to_ack + 1) % L2CAP_DEFAULT_NUM_TO_ACK;
         if (pi->num_to_ack == L2CAP_DEFAULT_NUM_TO_ACK - 1) {
                 tx_control |= L2CAP_CTRL_FRAME_TYPE;
@@ -2860,7 +2994,7 @@ static inline int l2cap_data_channel_sframe(struct sock *sk, u16 rx_control, str
 static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb)
 {
         struct sock *sk;
-        u16 control;
+        u16 control, len;
         int err;
 
         sk = l2cap_get_chan_by_scid(&conn->chan_list, cid);
@@ -2891,8 +3025,12 @@ static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk
         case L2CAP_MODE_ERTM:
                 control = get_unaligned_le16(skb->data);
                 skb_pull(skb, 2);
+                len = skb->len;
 
-                if (l2cap_pi(sk)->imtu < skb->len)
+                if (__is_sar_start(control))
+                        len -= 2;
+
+                if (len > L2CAP_DEFAULT_MAX_PDU_SIZE)
                         goto drop;
 
                 if (__is_iframe(control))