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| author |   Soheil Hassas Yeganeh <soheil@google.com> | 2016-04-02 23:08:09 -0400 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2016-04-04 15:50:30 -0400 |
| commit | 3dd17e63f5131bf2528f34aa5e3e57758175af92 (patch) | |
| tree | fd9d66aa0e6e9d8b8fa489a4396a21e25df37908 /net | |
| parent | tcp: use one bit in TCP_SKB_CB to mark ACK timestamps (diff) | |
| download | linux-dev-3dd17e63f5131bf2528f34aa5e3e57758175af92.tar.xz linux-dev-3dd17e63f5131bf2528f34aa5e3e57758175af92.zip | |
sock: accept SO_TIMESTAMPING flags in socket cmsg
Accept SO_TIMESTAMPING in control messages of the SOL_SOCKET level
as a basis to accept timestamping requests per write.
This implementation only accepts TX recording flags (i.e.,
SOF_TIMESTAMPING_TX_HARDWARE, SOF_TIMESTAMPING_TX_SOFTWARE,
SOF_TIMESTAMPING_TX_SCHED, and SOF_TIMESTAMPING_TX_ACK) in
control messages. Users need to set reporting flags (e.g.,
SOF_TIMESTAMPING_OPT_ID) per socket via socket options.
This commit adds a tsflags field in sockcm_cookie which is
set in __sock_cmsg_send. It only override the SOF_TIMESTAMPING_TX_*
bits in sockcm_cookie.tsflags allowing the control message
to override the recording behavior per write, yet maintaining
the value of other flags.
This patch implements validating the control message and setting
tsflags in struct sockcm_cookie. Next commits in this series will
actually implement timestamping per write for different protocols.
Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/core/sock.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/net/core/sock.c b/net/core/sock.c index 0a64fe20ce5a..315f5e57fffe 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -1870,6 +1870,8 @@ EXPORT_SYMBOL(sock_alloc_send_skb); int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg, struct sockcm_cookie *sockc) { + u32 tsflags; + switch (cmsg->cmsg_type) { case SO_MARK: if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) @@ -1878,6 +1880,17 @@ int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg, return -EINVAL; sockc->mark = *(u32 *)CMSG_DATA(cmsg); break; + case SO_TIMESTAMPING: + if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32))) + return -EINVAL; + + tsflags = *(u32 *)CMSG_DATA(cmsg); + if (tsflags & ~SOF_TIMESTAMPING_TX_RECORD_MASK) + return -EINVAL; + + sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK; + sockc->tsflags |= tsflags; + break; default: return -EINVAL; } |