From: David Ahern <dsahern@kernel•org>
To: netdev@vger•kernel.org, davem@davemloft•net
Cc: christian@brauner•io, jbenc@redhat•com,
stephen@networkplumber•org, David Ahern <dsahern@gmail•com>
Subject: [PATCH RFC v2 net-next 08/25] rtnetlink: Update rtnl_stats_dump to support NLM_F_DUMP_PROPER_HDR
Date: Mon, 1 Oct 2018 17:28:34 -0700 [thread overview]
Message-ID: <20181002002851.5002-9-dsahern@kernel.org> (raw)
In-Reply-To: <20181002002851.5002-1-dsahern@kernel.org>
From: David Ahern <dsahern@gmail•com>
Update rtnl_stats_dump to check for NLM_F_DUMP_PROPER_HDR in the netlink
message header. If the flag is set, the dump request is expected to have
an if_stats_msg struct as the header. All elements of the struct are
expected to be 0 except filter_mask which must be non-0 (legacy behavior).
No attributes are supported.
Signed-off-by: David Ahern <dsahern@gmail•com>
---
net/core/rtnetlink.c | 22 +++++++++++++++++++++-
1 file changed, 21 insertions(+), 1 deletion(-)
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 51a653b810be..1751baf0c823 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -4648,6 +4648,9 @@ static int rtnl_stats_get(struct sk_buff *skb, struct nlmsghdr *nlh,
static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
+ struct netlink_ext_ack *extack = cb->extack;
+ const struct nlmsghdr *nlh = cb->nlh;
+ bool proper_hdr = !!(nlh->nlmsg_flags & NLM_F_DUMP_PROPER_HDR);
int h, s_h, err, s_idx, s_idxattr, s_prividx;
struct net *net = sock_net(skb->sk);
unsigned int flags = NLM_F_MULTI;
@@ -4668,9 +4671,26 @@ static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb)
return -EINVAL;
ifsm = nlmsg_data(cb->nlh);
+
+ /* only requests using NLM_F_DUMP_PROPER_HDR can pass data to
+ * influence the dump. The legacy exception is filter_mask.
+ */
+ if (proper_hdr) {
+ if (ifsm->pad1 || ifsm->pad2 || ifsm->ifindex) {
+ NL_SET_ERR_MSG(extack, "Invalid values in header for dump request");
+ return -EINVAL;
+ }
+ if (nlmsg_len(cb->nlh) != nlmsg_msg_size(sizeof(*ifsm))) {
+ NL_SET_ERR_MSG(extack, "Invalid attributes after header");
+ return -EINVAL;
+ }
+ }
+
filter_mask = ifsm->filter_mask;
- if (!filter_mask)
+ if (!filter_mask) {
+ NL_SET_ERR_MSG(extack, "Invalid filter_mask in header");
return -EINVAL;
+ }
for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
idx = 0;
--
2.11.0
next prev parent reply other threads:[~2018-10-02 7:09 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-02 0:28 [PATCH RFC v2 net-next 00/25] rtnetlink: Add support for rigid checking of data in dump request David Ahern
2018-10-02 0:28 ` [PATCH RFC v2 net-next 01/25] net/netlink: Pass extack to dump callbacks David Ahern
2018-10-02 11:07 ` Christian Brauner
2018-10-02 0:28 ` [PATCH RFC v2 net-next 02/25] net/ipv6: Refactor address dump to push inet6_fill_args to in6_dump_addrs David Ahern
2018-10-02 10:54 ` Jiri Benc
2018-10-02 11:03 ` Christian Brauner
2018-10-02 11:07 ` Jiri Benc
2018-10-02 11:09 ` Christian Brauner
2018-10-02 15:11 ` David Ahern
2018-10-02 16:24 ` Jiri Benc
2018-10-02 0:28 ` [PATCH RFC v2 net-next 03/25] netlink: introduce NLM_F_DUMP_PROPER_HDR flag David Ahern
2018-10-02 11:06 ` Jiri Benc
2018-10-02 11:18 ` Christian Brauner
2018-10-02 11:27 ` Jiri Benc
2018-10-02 14:57 ` David Ahern
2018-10-02 16:30 ` Jiri Benc
2018-10-02 19:20 ` David Ahern
2018-10-02 14:55 ` David Ahern
2018-10-02 16:33 ` Jiri Benc
2018-10-02 0:28 ` [PATCH RFC v2 net-next 04/25] net/ipv4: Update inet_dump_ifaddr to support NLM_F_DUMP_PROPER_HDR David Ahern
2018-10-02 0:28 ` [PATCH RFC v2 net-next 05/25] net/ipv6: Update inet6_dump_addr " David Ahern
2018-10-02 0:28 ` [PATCH RFC v2 net-next 06/25] rtnetlink: Update rtnl_dump_ifinfo " David Ahern
2018-10-02 0:28 ` [PATCH RFC v2 net-next 07/25] rtnetlink: Update rtnl_bridge_getlink " David Ahern
2018-10-02 0:28 ` David Ahern [this message]
2018-10-02 0:28 ` [PATCH RFC v2 net-next 09/25] rtnetlink: Update inet6_dump_ifinfo " David Ahern
2018-10-02 0:28 ` [PATCH RFC v2 net-next 10/25] rtnetlink: Update ipmr_rtm_dumplink " David Ahern
2018-10-02 0:28 ` [PATCH RFC v2 net-next 11/25] rtnetlink: Update fib dumps " David Ahern
2018-10-02 0:28 ` [PATCH RFC v2 net-next 12/25] net/neigh: Refactor dump filter handling David Ahern
2018-10-02 0:28 ` [PATCH RFC v2 net-next 13/25] net/neighbor: Update neigh_dump_info to support NLM_F_DUMP_PROPER_HDR David Ahern
2018-10-02 0:28 ` [PATCH RFC v2 net-next 14/25] net/neighbor: Update neightbl_dump_info " David Ahern
2018-10-02 0:28 ` [PATCH RFC v2 net-next 15/25] net/namespace: Update rtnl_net_dumpid " David Ahern
2018-10-02 0:28 ` [PATCH RFC v2 net-next 16/25] net/fib_rules: Update fib_nl_dumprule " David Ahern
2018-10-02 0:28 ` [PATCH RFC v2 net-next 17/25] net/ipv6: Update ip6addrlbl_dump " David Ahern
2018-10-02 0:28 ` [PATCH RFC v2 net-next 18/25] net: Update netconf dump handlers " David Ahern
2018-10-02 0:28 ` [PATCH RFC v2 net-next 19/25] net/bridge: Update br_mdb_dump " David Ahern
2018-10-02 0:28 ` [PATCH RFC v2 net-next 20/25] net: Add struct for fib dump filter David Ahern
2018-10-02 0:28 ` [PATCH RFC v2 net-next 21/25] net/ipv4: Plumb support for filtering route dumps David Ahern
2018-10-02 0:28 ` [PATCH RFC v2 net-next 22/25] net/ipv6: " David Ahern
2018-10-02 0:28 ` [PATCH RFC v2 net-next 23/25] net/mpls: " David Ahern
2018-10-02 0:28 ` [PATCH RFC v2 net-next 24/25] net: Plumb support for filtering ipv4 and ipv6 multicast " David Ahern
2018-10-02 0:28 ` [PATCH RFC v2 net-next 25/25] net: Enable kernel side filtering of " David Ahern
2018-10-03 14:59 ` [PATCH RFC v2 net-next 00/25] rtnetlink: Add support for rigid checking of data in dump request Stephen Hemminger
2018-10-03 15:21 ` David Ahern
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