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netlink: rework policy dump to support multiple policies

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Rework the policy dump code a bit to support adding multiple
policies to a single dump, in order to e.g. support per-op
policies in generic netlink.

v2:
 - move kernel-doc to implementation [Jakub]
 - squash the first patch to not flip-flop on the prototype
   [Jakub]
 - merge netlink_policy_dump_get_policy_idx() with the old
   get_policy_idx() we already had
 - rebase without Jakub's patch to have per-op dump

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Johannes Berg
2020-10-03 10:44:43 +02:00
committed by David S. Miller
parent 899b07c578
commit 04a351a62b
3 changed files with 90 additions and 24 deletions
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9
include/net/netlink.h
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@ -1937,9 +1937,12 @@ void nla_get_range_signed(const struct nla_policy *pt,
struct netlink_policy_dump_state;
int netlink_policy_dump_start(const struct nla_policy *policy,
unsigned int maxtype,
struct netlink_policy_dump_state **state);
int netlink_policy_dump_add_policy(struct netlink_policy_dump_state **pstate,
const struct nla_policy *policy,
unsigned int maxtype);
int netlink_policy_dump_get_policy_idx(struct netlink_policy_dump_state *state,
const struct nla_policy *policy,
unsigned int maxtype);
bool netlink_policy_dump_loop(struct netlink_policy_dump_state *state);
int netlink_policy_dump_write(struct sk_buff *skb,
struct netlink_policy_dump_state *state);