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author | Thomas Graf <tgraf@suug.ch> | 2013-11-30 13:21:30 +0100 |
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committer | Jesse Gross <jesse@nicira.com> | 2014-01-06 15:51:53 -0800 |
commit | bb9b18fb55b03477fe5bdd3e97245d6d4d3dee4f (patch) | |
tree | 02d730abd6f31752a842f8c1d9f30d62d185e0b2 /net | |
parent | 663efa3696232300a8ad3a46bb10482fc0b861cf (diff) | |
download | linux-stable-bb9b18fb55b03477fe5bdd3e97245d6d4d3dee4f.tar.gz linux-stable-bb9b18fb55b03477fe5bdd3e97245d6d4d3dee4f.tar.bz2 linux-stable-bb9b18fb55b03477fe5bdd3e97245d6d4d3dee4f.zip |
genl: Add genlmsg_new_unicast() for unicast message allocation
Allocates a new sk_buff large enough to cover the specified payload
plus required Netlink headers. Will check receiving socket for
memory mapped i/o capability and use it if enabled. Will fall back
to non-mapped skb if message size exceeds the frame size of the ring.
Signed-of-by: Thomas Graf <tgraf@suug.ch>
Reviewed-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: Jesse Gross <jesse@nicira.com>
Diffstat (limited to 'net')
-rw-r--r-- | net/netlink/genetlink.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c index 4518a57aa5fe..85bf42e2a943 100644 --- a/net/netlink/genetlink.c +++ b/net/netlink/genetlink.c @@ -454,6 +454,26 @@ int genl_unregister_family(struct genl_family *family) EXPORT_SYMBOL(genl_unregister_family); /** + * genlmsg_new_unicast - Allocate generic netlink message for unicast + * @payload: size of the message payload + * @info: information on destination + * @flags: the type of memory to allocate + * + * Allocates a new sk_buff large enough to cover the specified payload + * plus required Netlink headers. Will check receiving socket for + * memory mapped i/o capability and use it if enabled. Will fall back + * to non-mapped skb if message size exceeds the frame size of the ring. + */ +struct sk_buff *genlmsg_new_unicast(size_t payload, struct genl_info *info, + gfp_t flags) +{ + size_t len = nlmsg_total_size(genlmsg_total_size(payload)); + + return netlink_alloc_skb(info->dst_sk, len, info->snd_portid, flags); +} +EXPORT_SYMBOL_GPL(genlmsg_new_unicast); + +/** * genlmsg_put - Add generic netlink header to netlink message * @skb: socket buffer holding the message * @portid: netlink portid the message is addressed to @@ -593,6 +613,7 @@ static int genl_family_rcv_msg(struct genl_family *family, info.genlhdr = nlmsg_data(nlh); info.userhdr = nlmsg_data(nlh) + GENL_HDRLEN; info.attrs = attrbuf; + info.dst_sk = skb->sk; genl_info_net_set(&info, net); memset(&info.user_ptr, 0, sizeof(info.user_ptr)); |