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Greg Rose a0d3aa1f04 rtnetlink: Fix problem with buffer allocation 
commit 115c9b8192 upstream.

Implement a new netlink attribute type IFLA_EXT_MASK.  The mask
is a 32 bit value that can be used to indicate to the kernel that
certain extended ifinfo values are requested by the user application.
At this time the only mask value defined is RTEXT_FILTER_VF to
indicate that the user wants the ifinfo dump to send information
about the VFs belonging to the interface.

This patch fixes a bug in which certain applications do not have
large enough buffers to accommodate the extra information returned
by the kernel with large numbers of SR-IOV virtual functions.
Those applications will not send the new netlink attribute with
the interface info dump request netlink messages so they will
not get unexpectedly large request buffers returned by the kernel.

Modifies the rtnl_calcit function to traverse the list of net
devices and compute the minimum buffer size that can hold the
info dumps of all matching devices based upon the filter passed
in via the new netlink attribute filter mask.  If no filter
mask is sent then the buffer allocation defaults to NLMSG_GOODSIZE.

With this change it is possible to add yet to be defined netlink
attributes to the dump request which should make it fairly extensible
in the future.

Signed-off-by: Greg Rose <gregory.v.rose@intel.com>
Acked-by: Greg Rose <gregory.v.rose@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
[bwh: Backported to 3.0:
 - Adjust context
 - Drop the change in do_setlink() that reverts commit f18da14565
   ('net: RTNETLINK adjusting values of min_ifinfo_dump_size'), which
   was never applied here]
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-17 08:43:58 -08:00
..
9p fs/9p: Use protocol-defined value for lock/getlock 'type' field. 2011-10-03 11:40:22 -07:00
bluetooth Bluetooth: hci_core: fix NULL-pointer dereference at unregister 2012-04-22 16:21:42 -07:00
caif caif: Update documentation of CAIF transmit and receive functions. 2011-05-22 20:11:48 -04:00
irda Fix common misspellings 2011-03-31 11:26:23 -03:00
iucv Fix common misspellings 2011-03-31 11:26:23 -03:00
netfilter netfilter: nf_conntrack: fix racy timer handling with reliable events 2012-10-21 09:17:11 -07:00
netns netns: Fail conspicously if someone uses net_generic at an inappropriate time. 2012-02-03 09:19:03 -08:00
phonet net: dont hold rtnl mutex during netlink dump callbacks 2011-05-02 15:26:28 -07:00
sctp sctp: check cached dst before using it 2012-06-10 00:33:03 +09:00
tc_act net/sched: add ACT_CSUM action to update packets checksums 2010-08-20 01:42:59 -07:00
act_api.h
addrconf.h net: Remove __KERNEL__ cpp checks from include/net 2011-04-24 10:54:56 -07:00
af_ieee802154.h
af_rxrpc.h net: Remove __KERNEL__ cpp checks from include/net 2011-04-24 10:54:56 -07:00
af_unix.h net: Remove __KERNEL__ cpp checks from include/net 2011-04-24 10:54:56 -07:00
ah.h ipsec: update MAX_AH_AUTH_LEN to support sha512 2011-01-13 21:48:25 -08:00
arp.h net: fix NULL dereferences in check_peer_redir() 2012-02-13 11:06:13 -08:00
atmclip.h net: Remove __KERNEL__ cpp checks from include/net 2011-04-24 10:54:56 -07:00
ax25.h
ax88796.h
cfg80211.h mac80211: fix rx->key NULL dereference during mic failure 2011-06-27 14:45:25 -04:00
checksum.h
cipso_ipv4.h cipso: handle CIPSO options correctly when NetLabel is disabled 2012-07-16 08:47:36 -07:00
cls_cgroup.h Merge commit 'v2.6.36-rc7' into core/rcu 2010-10-07 09:43:45 +02:00
compat.h net: Add sendmmsg socket system call 2011-05-05 11:10:14 -07:00
datalink.h
dcbevent.h net_dcb: add application notifiers 2010-12-31 10:47:46 -08:00
dcbnl.h dcbnl: add support for retrieving peer configuration - cee 2011-03-02 21:58:55 -08:00
dn.h decnet: Convert to use flowidn where applicable. 2011-03-12 15:08:55 -08:00
dn_dev.h decnet: RCU conversion and get rid of dev_base_lock 2010-11-08 13:50:08 -08:00
dn_fib.h decnet: Convert to use flowidn where applicable. 2011-03-12 15:08:55 -08:00
dn_neigh.h
dn_nsp.h
dn_route.h decnet: Convert to use flowidn where applicable. 2011-03-12 15:08:55 -08:00
dsa.h
dsfield.h
dst.h ipv6: fix incorrect ipsec fragment 2012-06-10 00:33:02 +09:00
dst_ops.h net: Implement read-only protection and COW'ing of metrics. 2011-01-26 20:51:05 -08:00
esp.h
ethoc.h
fib_rules.h fib_rules: __rcu annotates ctarget 2010-10-27 11:37:32 -07:00
flow.h ipv4: reset flowi parameters on route connect 2012-02-29 16:34:03 -08:00
garp.h garp: remove last synchronize_rcu() call 2011-05-12 17:46:56 -04:00
gen_stats.h Fix common misspellings 2011-03-31 11:26:23 -03:00
genetlink.h treewide: fix a few typos in comments 2011-05-10 10:16:21 +02:00
gre.h PPTP: PPP over IPv4 (Point-to-Point Tunneling Protocol) 2010-08-21 23:05:39 -07:00
icmp.h inetpeer: Move ICMP rate limiting state into inet_peer entries. 2011-02-04 15:59:53 -08:00
ieee80211_radiotap.h mac80211: add MCS information to radiotap 2011-01-28 15:44:29 -05:00
ieee802154.h
ieee802154_netdev.h
if_inet6.h ipv6: reduce per device ICMP mib sizes 2011-05-19 16:21:22 -04:00
inet6_connection_sock.h inet: Pass flowi to ->queue_xmit(). 2011-05-08 15:28:28 -07:00
inet6_hashtables.h
inet_common.h
inet_connection_sock.h ipv4: Make caller provide flowi4 key to inet_csk_route_req(). 2011-05-18 18:32:03 -04:00
inet_ecn.h ipv6: restore correct ECN handling on TCP xmit 2011-05-12 18:52:14 -04:00
inet_frag.h
inet_hashtables.h tproxy: fix hash locking issue when using port redirection in __inet_inherit_port() 2010-10-21 13:06:43 +02:00
inet_sock.h ipv4: Save nexthop address of LSRR/SSRR option to IPCB. 2012-02-29 16:34:02 -08:00
inet_timewait_sock.h net: optimize INET input path further 2010-12-09 20:05:58 -08:00
inetpeer.h inet: constify ip headers and in6_addr 2011-04-22 11:04:14 -07:00
ip.h ipv4: Pass explicit daddr arg to ip_send_reply(). 2011-05-10 13:32:46 -07:00
ip6_checksum.h
ip6_fib.h net: Remove __KERNEL__ cpp checks from include/net 2011-04-24 10:54:56 -07:00
ip6_route.h net: Remove __KERNEL__ cpp checks from include/net 2011-04-24 10:54:56 -07:00
ip6_tunnel.h tunnels: add _rcu annotations 2010-10-25 13:09:45 -07:00
ip_fib.h ipv4: Call fib_select_default() only when actually necessary. 2011-04-14 15:05:22 -07:00
ip_vs.h ipvs: fix oops on NAT reply in br_nf context 2012-10-21 09:17:11 -07:00
ipcomp.h
ipconfig.h
ipip.h tunnels: add __rcu annotations 2010-10-27 11:37:32 -07:00
ipv6.h ipv6: fix NULL dereference in udp6_ufo_fragment() 2011-10-16 14:14:54 -07:00
ipx.h net: Remove __KERNEL__ cpp checks from include/net 2011-04-24 10:54:56 -07:00
iw_handler.h Fix common misspellings 2011-03-31 11:26:23 -03:00
lapb.h
lib80211.h
llc.h
llc_c_ac.h
llc_c_ev.h
llc_c_st.h
llc_conn.h
llc_if.h
llc_pdu.h bonding,llc: Fix structure sizeof incompatibility for some PDUs 2011-05-13 15:13:24 -04:00
llc_s_ac.h
llc_s_ev.h
llc_s_st.h
llc_sap.h
mac80211.h Merge ssh://master.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next-2.6 into for-davem 2011-05-24 16:47:54 -04:00
mip6.h
mld.h
ndisc.h net: Remove __KERNEL__ cpp checks from include/net 2011-04-24 10:54:56 -07:00
neighbour.h Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2010-11-19 13:13:47 -08:00
net_namespace.h Delay struct net freeing while there's a sysfs instance refering to it 2011-06-12 17:45:41 -04:00
net_ratelimit.h net: Kill ratelimit.h dependency in linux/net.h 2011-05-27 13:41:33 -04:00
netdma.h
netevent.h net: Remove __KERNEL__ cpp checks from include/net 2011-04-24 10:54:56 -07:00
netlabel.h
netlink.h treewide: fix a few typos in comments 2011-05-10 10:16:21 +02:00
netrom.h
nexthop.h
nl802154.h
p8022.h
ping.h net: ping: fix build failure 2011-05-17 14:16:58 -04:00
pkt_cls.h net: Fix range checks in tcf_valid_offset(). 2010-12-21 12:43:16 -08:00
pkt_sched.h Fix common misspellings 2011-03-31 11:26:23 -03:00
protocol.h net: change netdev->features to u32 2011-01-24 15:32:47 -08:00
psnap.h
raw.h include/net/raw.h: Convert raw_seq_private macro to inline 2010-09-08 13:42:22 -07:00
rawv6.h net: Remove __KERNEL__ cpp checks from include/net 2011-04-24 10:54:56 -07:00
red.h sched: remove unused backlog in RED stats 2011-01-12 19:00:39 -08:00
regulatory.h cfg80211: Fix regulatory bug with multiple cards and delays 2010-11-22 15:48:51 -05:00
request_sock.h
rose.h rose: Add length checks to CALL_REQUEST parsing 2011-03-27 17:59:04 -07:00
route.h ipv4: reset flowi parameters on route connect 2012-02-29 16:34:03 -08:00
rtnetlink.h rtnetlink: Fix problem with buffer allocation 2013-01-17 08:43:58 -08:00
sch_generic.h bonding: Fix corrupted queue_mapping 2012-07-16 08:47:37 -07:00
scm.h scm: lower SCM_MAX_FD 2010-11-24 11:16:43 -08:00
secure_seq.h net: Compute protocol sequence numbers and fragment IDs using MD5. 2011-08-15 18:31:35 -07:00
slhc_vj.h
snmp.h ipv6: reduce per device ICMP mib sizes 2011-05-19 16:21:22 -04:00
sock.h tcp: Apply device TSO segment limit earlier 2012-10-02 09:47:04 -07:00
stp.h
tcp.h tcp: implement RFC 5961 3.2 2013-01-11 09:03:48 -08:00
tcp_states.h
timewait_sock.h timewait_sock: Create and use getpeer op. 2010-12-01 18:09:13 -08:00
transp_v6.h ipv6: make fragment identifications less predictable 2011-08-15 18:31:37 -07:00
udp.h udp: Switch to ip_finish_skb 2011-03-01 12:35:03 -08:00
udplite.h udp: Switch to ip_finish_skb 2011-03-01 12:35:03 -08:00
wext.h
wimax.h net: Remove __KERNEL__ cpp checks from include/net 2011-04-24 10:54:56 -07:00
wpan-phy.h Fix common misspellings 2011-03-31 11:26:23 -03:00
x25.h X25 remove bkl in subscription ioctls 2010-11-28 11:12:20 -08:00
x25device.h
xfrm.h xfrm: Workaround incompatibility of ESN and async crypto 2012-10-13 05:28:03 +09:00