Commit a0de1cd3 authored by Jakub Kicinski's avatar Jakub Kicinski Committed by David S. Miller
Browse files

ethtool: specify which header flags are supported per command 



Perform header flags validation through the policy.

Only pause command supports ETHTOOL_FLAG_STATS. Create a separate
policy to be able to express that in policy dumps to user space.

Note that even though the core will validate the header policy,
it cannot record multiple layers of attributes and we have to
re-parse header sub-attrs. When doing so we could skip attribute
validation, or use most permissive policy. Opt for the former.

We will no longer return the extack cookie for flags but since
we only added first new flag in this release it's not expected
that any user space had a chance to make use of it.

v2: - remove the re-validation in ethnl_parse_header_dev_get()

Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent bdbb4e29

net/ethtool/netlink.c

+19 −10
Original line number Diff line number Diff line
@@ -9,11 +9,24 @@ static struct genl_family ethtool_genl_family; 
static bool ethnl_ok __read_mostly;

static u32 ethnl_bcast_seq;



#define ETHTOOL_FLAGS_BASIC (ETHTOOL_FLAG_COMPACT_BITSETS |	\

			     ETHTOOL_FLAG_OMIT_REPLY)

#define ETHTOOL_FLAGS_STATS (ETHTOOL_FLAGS_BASIC | ETHTOOL_FLAG_STATS)



const struct nla_policy ethnl_header_policy[] = {

	[ETHTOOL_A_HEADER_DEV_INDEX]	= { .type = NLA_U32 },

	[ETHTOOL_A_HEADER_DEV_NAME]	= { .type = NLA_NUL_STRING,

					    .len = ALTIFNAMSIZ - 1 },

	[ETHTOOL_A_HEADER_FLAGS]	= { .type = NLA_U32 },

	[ETHTOOL_A_HEADER_FLAGS]	= NLA_POLICY_MASK(NLA_U32,

							  ETHTOOL_FLAGS_BASIC),

};



const struct nla_policy ethnl_header_policy_stats[] = {

	[ETHTOOL_A_HEADER_DEV_INDEX]	= { .type = NLA_U32 },

	[ETHTOOL_A_HEADER_DEV_NAME]	= { .type = NLA_NUL_STRING,

					    .len = ALTIFNAMSIZ - 1 },

	[ETHTOOL_A_HEADER_FLAGS]	= NLA_POLICY_MASK(NLA_U32,

							  ETHTOOL_FLAGS_STATS),

};



/**
@@ -46,19 +59,15 @@ int ethnl_parse_header_dev_get(struct ethnl_req_info *req_info, 
		NL_SET_ERR_MSG(extack, "request header missing");

		return -EINVAL;

	}

	/* No validation here, command policy should have a nested policy set

	 * for the header, therefore validation should have already been done.

	 */

	ret = nla_parse_nested(tb, ARRAY_SIZE(ethnl_header_policy) - 1, header,

			       ethnl_header_policy, extack);

			       NULL, extack);

	if (ret < 0)

		return ret;

	if (tb[ETHTOOL_A_HEADER_FLAGS]) {

	if (tb[ETHTOOL_A_HEADER_FLAGS])

		flags = nla_get_u32(tb[ETHTOOL_A_HEADER_FLAGS]);

		if (flags & ~ETHTOOL_FLAG_ALL) {

			NL_SET_ERR_MSG_ATTR(extack, tb[ETHTOOL_A_HEADER_FLAGS],

					    "unrecognized request flags");

			nl_set_extack_cookie_u32(extack, ETHTOOL_FLAG_ALL);

			return -EOPNOTSUPP;

		}

	}



	devname_attr = tb[ETHTOOL_A_HEADER_DEV_NAME];

	if (tb[ETHTOOL_A_HEADER_DEV_INDEX]) {

net/ethtool/netlink.h

+1 −0
Original line number Diff line number Diff line
@@ -346,6 +346,7 @@ extern const struct ethnl_request_ops ethnl_eee_request_ops; 
extern const struct ethnl_request_ops ethnl_tsinfo_request_ops;



extern const struct nla_policy ethnl_header_policy[ETHTOOL_A_HEADER_FLAGS + 1];

extern const struct nla_policy ethnl_header_policy_stats[ETHTOOL_A_HEADER_FLAGS + 1];

extern const struct nla_policy ethnl_strset_get_policy[ETHTOOL_A_STRSET_STRINGSETS + 1];

extern const struct nla_policy ethnl_linkinfo_get_policy[ETHTOOL_A_LINKINFO_HEADER + 1];

extern const struct nla_policy ethnl_linkinfo_set_policy[ETHTOOL_A_LINKINFO_TP_MDIX_CTRL + 1];

net/ethtool/pause.c

+1 −1
Original line number Diff line number Diff line
@@ -18,7 +18,7 @@ struct pause_reply_data { 


const struct nla_policy ethnl_pause_get_policy[] = {

	[ETHTOOL_A_PAUSE_HEADER]		=

		NLA_POLICY_NESTED(ethnl_header_policy),

		NLA_POLICY_NESTED(ethnl_header_policy_stats),

};



static void ethtool_stats_init(u64 *stats, unsigned int n)

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