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Message-Id: <20210504203546.115734-3-erik@flodin.me>
Date: Tue, 4 May 2021 22:35:46 +0200
From: Erik Flodin <erik@...din.me>
To: socketcan@...tkopp.net, mkl@...gutronix.de
Cc: davem@...emloft.net, kuba@...nel.org, corbet@....net,
linux-can@...r.kernel.org, netdev@...r.kernel.org,
linux-doc@...r.kernel.org, Erik Flodin <erik@...din.me>
Subject: [PATCH v2 2/2] can: raw: add CAN_RAW_RECV_OWN_MSGS_ALL socket option
CAN_RAW_RECV_OWN_MSGS_ALL works as CAN_RAW_RECV_OWN_MSGS with the
difference that all sent frames are received as no filtering is applied
on the socket's own frames in this case.
Signed-off-by: Erik Flodin <erik@...din.me>
---
Documentation/networking/can.rst | 7 +++
include/uapi/linux/can/raw.h | 18 ++++---
net/can/raw.c | 91 +++++++++++++++++++++++++++-----
3 files changed, 95 insertions(+), 21 deletions(-)
diff --git a/Documentation/networking/can.rst b/Documentation/networking/can.rst
index f34cb0e4460e..80c70357cd33 100644
--- a/Documentation/networking/can.rst
+++ b/Documentation/networking/can.rst
@@ -611,6 +611,13 @@ demand:
Note that reception of a socket's own CAN frames are subject to the same
filtering as other CAN frames (see :ref:`socketcan-rawfilter`).
+RAW socket option CAN_RAW_RECV_OWN_MSGS_ALL
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Identical to CAN_RAW_RECV_OWN_MSGS except that all sent messages are
+received. I.e. reception is not subject to filtering.
+
+
.. _socketcan-rawfd:
RAW Socket Option CAN_RAW_FD_FRAMES
diff --git a/include/uapi/linux/can/raw.h b/include/uapi/linux/can/raw.h
index 3386aa81fdf2..6e29b2b145e2 100644
--- a/include/uapi/linux/can/raw.h
+++ b/include/uapi/linux/can/raw.h
@@ -53,15 +53,17 @@ enum {
SCM_CAN_RAW_ERRQUEUE = 1,
};
-/* for socket options affecting the socket (not the global system) */
-
+/* For socket options affecting the socket (not the global system).
+ * Options default to off unless noted otherwise.
+ */
enum {
- CAN_RAW_FILTER = 1, /* set 0 .. n can_filter(s) */
- CAN_RAW_ERR_FILTER, /* set filter for error frames */
- CAN_RAW_LOOPBACK, /* local loopback (default:on) */
- CAN_RAW_RECV_OWN_MSGS, /* receive my own msgs (default:off) */
- CAN_RAW_FD_FRAMES, /* allow CAN FD frames (default:off) */
- CAN_RAW_JOIN_FILTERS, /* all filters must match to trigger */
+ CAN_RAW_FILTER = 1, /* set 0 .. n can_filter(s) */
+ CAN_RAW_ERR_FILTER, /* set filter for error frames */
+ CAN_RAW_LOOPBACK, /* local loopback (default on) */
+ CAN_RAW_RECV_OWN_MSGS, /* receive my own msgs w/ filtering */
+ CAN_RAW_FD_FRAMES, /* allow CAN FD frames */
+ CAN_RAW_JOIN_FILTERS, /* all filters must match to trigger */
+ CAN_RAW_RECV_OWN_MSGS_ALL, /* receive my own msgs w/o filtering */
};
#endif /* !_UAPI_CAN_RAW_H */
diff --git a/net/can/raw.c b/net/can/raw.c
index acfbae28d451..79c29942b0be 100644
--- a/net/can/raw.c
+++ b/net/can/raw.c
@@ -86,6 +86,7 @@ struct raw_sock {
struct notifier_block notifier;
int loopback;
int recv_own_msgs;
+ int recv_own_msgs_all;
int fd_frames;
int join_filters;
int count; /* number of active filters */
@@ -122,7 +123,7 @@ static void raw_rcv(struct sk_buff *oskb, void *data)
unsigned int *pflags;
/* check the received tx sock reference */
- if (!ro->recv_own_msgs && oskb->sk == sk)
+ if (!ro->recv_own_msgs && !ro->recv_own_msgs_all && oskb->sk == sk)
return;
/* do not pass non-CAN2.0 frames to a legacy socket */
@@ -132,7 +133,8 @@ static void raw_rcv(struct sk_buff *oskb, void *data)
/* eliminate multiple filter matches for the same skb */
if (this_cpu_ptr(ro->uniq)->skb == oskb &&
this_cpu_ptr(ro->uniq)->skbcnt == can_skb_prv(oskb)->skbcnt) {
- if (ro->join_filters) {
+ if (ro->join_filters &&
+ (!ro->recv_own_msgs_all || oskb->sk != sk)) {
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)
@@ -145,8 +147,10 @@ static void raw_rcv(struct sk_buff *oskb, void *data)
this_cpu_ptr(ro->uniq)->skbcnt = can_skb_prv(oskb)->skbcnt;
this_cpu_ptr(ro->uniq)->join_rx_count = 1;
/* drop first frame to check all enabled filters? */
- if (ro->join_filters && ro->count > 1)
+ if (ro->join_filters && ro->count > 1 &&
+ (!ro->recv_own_msgs_all || oskb->sk != sk)) {
return;
+ }
}
/* clone the given skb to be able to enqueue it into the rcv queue */
@@ -214,6 +218,18 @@ static int raw_enable_errfilter(struct net *net, struct net_device *dev,
return err;
}
+static int raw_enable_ownfilter(struct net *net, struct net_device *dev,
+ struct sock *sk, bool recv_own_msgs_all)
+{
+ int err = 0;
+
+ if (recv_own_msgs_all)
+ err = can_rx_register(net, dev, 0, MASK_ALL, true, raw_rcv,
+ sk, "raw", sk);
+
+ return err;
+}
+
static void raw_disable_filters(struct net *net, struct net_device *dev,
struct sock *sk, struct can_filter *filter,
int count)
@@ -236,6 +252,13 @@ static inline void raw_disable_errfilter(struct net *net,
false, raw_rcv, sk);
}
+static void raw_disable_ownfilter(struct net *net, struct net_device *dev,
+ struct sock *sk, bool recv_own_msgs_all)
+{
+ if (recv_own_msgs_all)
+ can_rx_unregister(net, dev, 0, MASK_ALL, true, raw_rcv, sk);
+}
+
static inline void raw_disable_allfilters(struct net *net,
struct net_device *dev,
struct sock *sk)
@@ -244,6 +267,7 @@ static inline void raw_disable_allfilters(struct net *net,
raw_disable_filters(net, dev, sk, ro->filter, ro->count);
raw_disable_errfilter(net, dev, sk, ro->err_mask);
+ raw_disable_ownfilter(net, dev, sk, ro->recv_own_msgs_all);
}
static int raw_enable_allfilters(struct net *net, struct net_device *dev,
@@ -253,13 +277,19 @@ static int raw_enable_allfilters(struct net *net, struct net_device *dev,
int err;
err = raw_enable_filters(net, dev, sk, ro->filter, ro->count);
- if (!err) {
- err = raw_enable_errfilter(net, dev, sk, ro->err_mask);
- if (err)
- raw_disable_filters(net, dev, sk, ro->filter,
- ro->count);
- }
+ if (err)
+ goto out;
+ err = raw_enable_errfilter(net, dev, sk, ro->err_mask);
+ if (err)
+ goto out_disable;
+ err = raw_enable_ownfilter(net, dev, sk, ro->recv_own_msgs_all);
+ if (!err)
+ goto out;
+ raw_disable_errfilter(net, dev, sk, ro->err_mask);
+out_disable:
+ raw_disable_filters(net, dev, sk, ro->filter, ro->count);
+out:
return err;
}
@@ -323,10 +353,11 @@ static int raw_init(struct sock *sk)
ro->count = 1;
/* set default loopback behaviour */
- ro->loopback = 1;
- ro->recv_own_msgs = 0;
- ro->fd_frames = 0;
- ro->join_filters = 0;
+ ro->loopback = 1;
+ ro->recv_own_msgs = 0;
+ ro->recv_own_msgs_all = 0;
+ ro->fd_frames = 0;
+ ro->join_filters = 0;
/* alloc_percpu provides zero'ed memory */
ro->uniq = alloc_percpu(struct uniqframe);
@@ -495,6 +526,7 @@ static int raw_setsockopt(struct socket *sock, int level, int optname,
can_err_mask_t err_mask = 0;
int count = 0;
int err = 0;
+ int old_val;
if (level != SOL_CAN_RAW)
return -EINVAL;
@@ -639,6 +671,33 @@ static int raw_setsockopt(struct socket *sock, int level, int optname,
break;
+ case CAN_RAW_RECV_OWN_MSGS_ALL:
+ if (optlen != sizeof(ro->recv_own_msgs_all))
+ return -EINVAL;
+
+ old_val = ro->recv_own_msgs_all;
+ if (copy_from_sockptr(&ro->recv_own_msgs_all, optval, optlen))
+ return -EFAULT;
+
+ lock_sock(sk);
+
+ if (ro->bound && ro->ifindex)
+ dev = dev_get_by_index(sock_net(sk), ro->ifindex);
+
+ if (ro->bound) {
+ if (old_val && !ro->recv_own_msgs_all)
+ raw_disable_ownfilter(sock_net(sk), dev, sk, true);
+ else if (!old_val && ro->recv_own_msgs_all)
+ err = raw_enable_ownfilter(sock_net(sk), dev, sk, true);
+ }
+
+ if (dev)
+ dev_put(dev);
+
+ release_sock(sk);
+
+ break;
+
default:
return -ENOPROTOOPT;
}
@@ -718,6 +777,12 @@ static int raw_getsockopt(struct socket *sock, int level, int optname,
val = &ro->join_filters;
break;
+ case CAN_RAW_RECV_OWN_MSGS_ALL:
+ if (len > sizeof(int))
+ len = sizeof(int);
+ val = &ro->recv_own_msgs_all;
+ break;
+
default:
return -ENOPROTOOPT;
}
--
2.31.1
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