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inet_diag: Move the INET_DIAG_REQ_BYTECODE nlattr to cb->data

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The INET_DIAG_REQ_BYTECODE nlattr is currently re-found every time when
the "dump()" is re-started.

In a latter patch, it will also need to parse the new
INET_DIAG_REQ_SK_BPF_STORAGES nlattr to learn the map_fds. Thus, this
patch takes this chance to store the parsed nlattr in cb->data
during the "start" time of a dump.

By doing this, the "bc" argument also becomes unnecessary
and is removed.  Also, the two copies of the INET_DIAG_REQ_BYTECODE
parsing-audit logic between compat/current version can be
consolidated to one.

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20200225230415.1975555-1-kafai@fb.com
This commit is contained in:
Martin KaFai Lau
2020-02-25 15:04:15 -08:00
committed by Alexei Starovoitov
parent 5682d393b4
commit 0df6d32842
8 changed files with 98 additions and 64 deletions
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6
net/ipv4/raw_diag.c
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@@ -138,17 +138,21 @@ static int sk_diag_dump(struct sock *sk, struct sk_buff *skb,
}
static void raw_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
const struct inet_diag_req_v2 *r, struct nlattr *bc)
const struct inet_diag_req_v2 *r)
{
bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
struct raw_hashinfo *hashinfo = raw_get_hashinfo(r);
struct net *net = sock_net(skb->sk);
struct inet_diag_dump_data *cb_data;
int num, s_num, slot, s_slot;
struct sock *sk = NULL;
struct nlattr *bc;
if (IS_ERR(hashinfo))
return;
cb_data = cb->data;
bc = cb_data->inet_diag_nla_bc;
s_slot = cb->args[0];
num = s_num = cb->args[1];