diff options
Diffstat (limited to 'net/can/raw.c')
| -rw-r--r-- | net/can/raw.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/net/can/raw.c b/net/can/raw.c index 63ffdb0f3a23..31b9748cbb4e 100644 --- a/net/can/raw.c +++ b/net/can/raw.c @@ -74,6 +74,12 @@ MODULE_ALIAS("can-proto-1"); * storing the single filter in dfilter, to avoid using dynamic memory. */ +struct uniqframe { + ktime_t tstamp; + const struct sk_buff *skb; + unsigned int join_rx_count; +}; + struct raw_sock { struct sock sk; int bound; @@ -82,10 +88,12 @@ struct raw_sock { int loopback; int recv_own_msgs; int fd_frames; + int join_filters; int count; /* number of active filters */ struct can_filter dfilter; /* default/single filter */ struct can_filter *filter; /* pointer to filter(s) */ can_err_mask_t err_mask; + struct uniqframe __percpu *uniq; }; /* @@ -123,6 +131,26 @@ static void raw_rcv(struct sk_buff *oskb, void *data) if (!ro->fd_frames && oskb->len != CAN_MTU) return; + /* eliminate multiple filter matches for the same skb */ + if (this_cpu_ptr(ro->uniq)->skb == oskb && + ktime_equal(this_cpu_ptr(ro->uniq)->tstamp, oskb->tstamp)) { + if (ro->join_filters) { + this_cpu_inc(ro->uniq->join_rx_count); + /* drop frame until all enabled filters matched */ + if (this_cpu_ptr(ro->uniq)->join_rx_count < ro->count) + return; + } else { + return; + } + } else { + this_cpu_ptr(ro->uniq)->skb = oskb; + this_cpu_ptr(ro->uniq)->tstamp = oskb->tstamp; + this_cpu_ptr(ro->uniq)->join_rx_count = 1; + /* drop first frame to check all enabled filters? */ + if (ro->join_filters && ro->count > 1) + return; + } + /* clone the given skb to be able to enqueue it into the rcv queue */ skb = skb_clone(oskb, GFP_ATOMIC); if (!skb) @@ -296,6 +324,12 @@ static int raw_init(struct sock *sk) ro->loopback = 1; ro->recv_own_msgs = 0; ro->fd_frames = 0; + ro->join_filters = 0; + + /* alloc_percpu provides zero'ed memory */ + ro->uniq = alloc_percpu(struct uniqframe); + if (unlikely(!ro->uniq)) + return -ENOMEM; /* set notifier */ ro->notifier.notifier_call = raw_notifier; @@ -339,6 +373,7 @@ static int raw_release(struct socket *sock) ro->ifindex = 0; ro->bound = 0; ro->count = 0; + free_percpu(ro->uniq); sock_orphan(sk); sock->sk = NULL; @@ -583,6 +618,15 @@ static int raw_setsockopt(struct socket *sock, int level, int optname, break; + case CAN_RAW_JOIN_FILTERS: + if (optlen != sizeof(ro->join_filters)) + return -EINVAL; + + if (copy_from_user(&ro->join_filters, optval, optlen)) + return -EFAULT; + + break; + default: return -ENOPROTOOPT; } @@ -647,6 +691,12 @@ static int raw_getsockopt(struct socket *sock, int level, int optname, val = &ro->fd_frames; break; + case CAN_RAW_JOIN_FILTERS: + if (len > sizeof(int)) + len = sizeof(int); + val = &ro->join_filters; + break; + default: return -ENOPROTOOPT; } |