lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Wed, 3 Jun 2020 13:10:51 +0200 From: Richard Sailer <richard_siegfried@...temli.org> To: gerrit@....abdn.ac.uk, davem@...emloft.net, dccp@...r.kernel.org Cc: netdev@...r.kernel.org Subject: [PATCH v3] net: dccp: Add SIOCOUTQ IOCTL support (send buffer fill) This adds support for the SIOCOUTQ IOCTL to get the send buffer fill of a DCCP socket, like UDP and TCP sockets already have. Regarding the used data field: DCCP uses per packet sequence numbers, not per byte, so sequence numbers can't be used like in TCP. sk_wmem_queued is not used by DCCP and always 0, even in test on highly congested paths. Therefore this uses sk_wmem_alloc like in UDP. Signed-off-by: Richard Sailer <richard_siegfried@...temli.org> --- v3: whitespace fixes --- Documentation/networking/dccp.txt | 2 ++ net/dccp/proto.c | 8 ++++++++ 2 files changed, 10 insertions(+) diff --git a/Documentation/networking/dccp.txt b/Documentation/networking/dccp.txt index 55c575fcaf17d..682ecf8288827 100644 --- a/Documentation/networking/dccp.txt +++ b/Documentation/networking/dccp.txt @@ -185,6 +185,8 @@ FIONREAD Works as in udp(7): returns in the `int' argument pointer the size of the next pending datagram in bytes, or 0 when no datagram is pending. +SIOCOUTQ + Returns the number of data bytes in the local send queue. Other tunables ============== diff --git a/net/dccp/proto.c b/net/dccp/proto.c index 4af8a98fe7846..148de5ec585b2 100644 --- a/net/dccp/proto.c +++ b/net/dccp/proto.c @@ -375,6 +375,14 @@ int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg) goto out; switch (cmd) { + case SIOCOUTQ: { + /* Using sk_wmem_alloc here because sk_wmem_queued is not used by DCCP and + * always 0, comparably to UDP. + */ + int amount = sk_wmem_alloc_get(sk); + rc = put_user(amount, (int __user *)arg); + } + break; case SIOCINQ: { struct sk_buff *skb; unsigned long amount = 0; -- 2.26.2
Powered by blists - more mailing lists