net/can/raw.c

69  * the CAN frames matching that filter.  If the filter list is empty,
71  * opening the socket, is to have one filter which receives all frames.
72  * The filter list is allocated dynamically with the exception of the
74  * storing the single filter in dfilter, to avoid using dynamic memory.
100 	struct can_filter dfilter; /* default/single filter */
101 	struct can_filter *filter; /* pointer to filter(s) */
151 		/* filter CAN XL VCID content */
153 			/* apply VCID filter if user enabled the filter */
158 			/* no filter => do not forward VCID tagged frames */
164 	/* eliminate multiple filter matches for the same skb */
213 			      struct sock *sk, struct can_filter *filter,
220 		err = can_rx_register(net, dev, filter[i].can_id,
221 				      filter[i].can_mask,
226 				can_rx_unregister(net, dev, filter[i].can_id,
227 						  filter[i].can_mask,
249 				struct sock *sk, struct can_filter *filter,
255 		can_rx_unregister(net, dev, filter[i].can_id,
256 				  filter[i].can_mask, raw_rcv, sk);
276 	raw_disable_filters(net, dev, sk, ro->filter, ro->count);
286 	err = raw_enable_filters(net, dev, sk, ro->filter, ro->count);
290 			raw_disable_filters(net, dev, sk, ro->filter,
318 			kfree(ro->filter);
370 	/* set default filter to single entry dfilter */
373 	ro->filter           = &ro->dfilter;
429 		kfree(ro->filter);
555 	struct can_filter *filter = NULL;  /* dyn. alloc'ed filters */
556 	struct can_filter sfilter;         /* single filter */
577 			/* filter does not fit into dfilter => alloc space */
578 			filter = memdup_sockptr(optval, optlen);
579 			if (IS_ERR(filter))
580 				return PTR_ERR(filter);
593 					kfree(filter);
606 							 filter, count);
609 					kfree(filter);
613 			/* remove old filter registrations */
614 			raw_disable_filters(sock_net(sk), dev, sk, ro->filter,
618 		/* remove old filter space */
620 			kfree(ro->filter);
624 			/* copy filter data for single filter */
626 			filter = &ro->dfilter;
628 		ro->filter = filter;
775 			/* user space buffer to small for filter list? */
784 				if (copy_to_user(optval, ro->filter, len))