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net: diag: Add support to filter on device index 

Add support to inet_diag facility to filter sockets based on device
index. If an interface index is in the filter only sockets bound
to that index (sk_bound_dev_if) are returned.

Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2016-06-23 18:42:51 -07:00 committed by David S. Miller
parent 1ba44a1f4d
commit 637c841dd7
2 changed files with 26 additions and 0 deletions
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1
include/uapi/linux/inet_diag.h
View File

@ -72,6 +72,7 @@ enum {
INET_DIAG_BC_AUTO,
INET_DIAG_BC_S_COND,
INET_DIAG_BC_D_COND,
INET_DIAG_BC_DEV_COND, /* u32 ifindex */
};
struct inet_diag_hostcond {

25
net/ipv4/inet_diag.c
View File

@ -44,6 +44,7 @@ struct inet_diag_entry {
u16 dport;
u16 family;
u16 userlocks;
u32 ifindex;
};
static DEFINE_MUTEX(inet_diag_table_mutex);
@ -571,6 +572,14 @@ static int inet_diag_bc_run(const struct nlattr *_bc,
yes = 0;
break;
}
case INET_DIAG_BC_DEV_COND: {
u32 ifindex;
ifindex = *((const u32 *)(op + 1));
if (ifindex != entry->ifindex)
yes = 0;
break;
}
}
if (yes) {
@ -613,6 +622,7 @@ int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
entry_fill_addrs(&entry, sk);
entry.sport = inet->inet_num;
entry.dport = ntohs(inet->inet_dport);
entry.ifindex = sk->sk_bound_dev_if;
entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
return inet_diag_bc_run(bc, &entry);
@ -636,6 +646,17 @@ static int valid_cc(const void *bc, int len, int cc)
return 0;
}
/* data is u32 ifindex */
static bool valid_devcond(const struct inet_diag_bc_op *op, int len,
int *min_len)
{
/* Check ifindex space. */
*min_len += sizeof(u32);
if (len < *min_len)
return false;
return true;
}
/* Validate an inet_diag_hostcond. */
static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
int *min_len)
@ -700,6 +721,10 @@ static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
if (!valid_hostcond(bc, len, &min_len))
return -EINVAL;
break;
case INET_DIAG_BC_DEV_COND:
if (!valid_devcond(bc, len, &min_len))
return -EINVAL;
break;
case INET_DIAG_BC_S_GE:
case INET_DIAG_BC_S_LE:
case INET_DIAG_BC_D_GE: