net/bluetooth/6lowpan.c

36 #define lowpan_cb(skb) ((struct skb_cb *)((skb)->cb))
134 						  struct sk_buff *skb)
136 	struct rt6_info *rt = dst_rt6_info(skb_dst(skb));
145 		if (ipv6_addr_any(&lowpan_cb(skb)->gw)) {
153 			nexthop = &lowpan_cb(skb)->gw;
162 		memcpy(&lowpan_cb(skb)->gw, nexthop, sizeof(struct in6_addr));
235 static int give_skb_to_upper(struct sk_buff *skb, struct net_device *dev)
239 	skb_cp = skb_copy(skb, GFP_ATOMIC);
246 static int iphc_decompress(struct sk_buff *skb, struct net_device *netdev,
253 	return lowpan_header_decompress(skb, netdev, netdev->dev_addr, saddr);
256 static int recv_pkt(struct sk_buff *skb, struct net_device *dev,
265 	if (dev->type != ARPHRD_6LOWPAN || !skb->len)
268 	skb_reset_network_header(skb);
270 	skb = skb_share_check(skb, GFP_ATOMIC);
271 	if (!skb)
275 	if (lowpan_is_ipv6(*skb_network_header(skb))) {
277 		skb_pull(skb, 1);
282 		local_skb = skb_copy_expand(skb, NET_SKB_PAD - 1,
283 					    skb_tailroom(skb), GFP_ATOMIC);
298 		dev->stats.rx_bytes += skb->len;
302 		consume_skb(skb);
303 	} else if (lowpan_is_iphc(*skb_network_header(skb))) {
304 		local_skb = skb_clone(skb, GFP_ATOMIC);
326 		dev->stats.rx_bytes += skb->len;
330 		consume_skb(skb);
344 static int chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
358 	err = recv_pkt(skb, dev->netdev, peer);
367 static int setup_header(struct sk_buff *skb, struct net_device *netdev,
377 	hdr = ipv6_hdr(skb);
384 		lowpan_cb(skb)->chan = NULL;
394 		peer = peer_lookup_dst(dev, &ipv6_daddr, skb);
403 		lowpan_cb(skb)->chan = peer->chan;
408 	lowpan_header_compress(skb, netdev, daddr, dev->netdev->dev_addr);
410 	err = dev_hard_header(skb, netdev, ETH_P_IPV6, NULL, NULL, 0);
417 static int header_create(struct sk_buff *skb, struct net_device *netdev,
428 static int send_pkt(struct l2cap_chan *chan, struct sk_buff *skb,
435 	/* Remember the skb so that we can send EAGAIN to the caller if
438 	chan->data = skb;
440 	iv.iov_base = skb->data;
441 	iv.iov_len = skb->len;
444 	iov_iter_kvec(&msg.msg_iter, ITER_SOURCE, &iv, 1, skb->len);
446 	err = l2cap_chan_send(chan, &msg, skb->len);
459 static int send_mcast_pkt(struct sk_buff *skb, struct net_device *netdev)
479 			local_skb = skb_clone(skb, GFP_ATOMIC);
498 static netdev_tx_t bt_xmit(struct sk_buff *skb, struct net_device *netdev)
504 	/* We must take a copy of the skb before we modify/replace the ipv6
507 	skb = skb_unshare(skb, GFP_ATOMIC);
508 	if (!skb)
516 	err = setup_header(skb, netdev, &addr, &addr_type);
518 		kfree_skb(skb);
523 		if (lowpan_cb(skb)->chan) {
526 			       &lowpan_cb(skb)->addr, lowpan_cb(skb)->chan);
527 			err = send_pkt(lowpan_cb(skb)->chan, skb, netdev);
535 		err = send_mcast_pkt(skb, netdev);
538 	dev_kfree_skb(skb);