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sock: introduce SO_MEMINFO getsockopt

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Allows reading of SK_MEMINFO_VARS via socket option. This way an
application can get all meminfo related information in single socket
option call instead of multiple calls.

Adds helper function, sk_get_meminfo(), and uses that for both
getsockopt and sock_diag_put_meminfo().

Suggested by Eric Dumazet.

Signed-off-by: Josh Hunt <johunt@akamai.com>
Reviewed-by: Jason Baron <jbaron@akamai.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Josh Hunt 2017-03-20 15:22:03 -04:00 • committed by David S. Miller
parent c7cd4c9bf8
commit a2d133b1d4
16 changed files with 60 additions and 9 deletions
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30
net/core/sock.c
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@ -1313,6 +1313,21 @@ int sock_getsockopt(struct socket *sock, int level, int optname,
v.val = sk->sk_incoming_cpu;
break;
case SO_MEMINFO:
{
u32 meminfo[SK_MEMINFO_VARS];
if (get_user(len, optlen))
return -EFAULT;
sk_get_meminfo(sk, meminfo);
len = min_t(unsigned int, len, sizeof(meminfo));
if (copy_to_user(optval, &meminfo, len))
return -EFAULT;
goto lenout;
}
default:
/* We implement the SO_SNDLOWAT etc to not be settable
* (1003.1g 7).
@ -2861,6 +2876,21 @@ void sk_common_release(struct sock *sk)
}
EXPORT_SYMBOL(sk_common_release);
void sk_get_meminfo(const struct sock *sk, u32 *mem)
{
memset(mem, 0, sizeof(*mem) * SK_MEMINFO_VARS);
mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk);
mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf;
mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk);
mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf;
mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued;
mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len;
mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);
}
#ifdef CONFIG_PROC_FS
#define PROTO_INUSE_NR 64 /* should be enough for the first time */
struct prot_inuse {