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Commit 637c841d authored by David Ahern's avatar David Ahern Committed by David S. Miller
Browse files

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: default avatarDavid Ahern <dsa@cumulusnetworks.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 1ba44a1f

include/uapi/linux/inet_diag.h

+1 −0
Original line number Diff line number Diff line
@@ -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 {

net/ipv4/inet_diag.c

+25 −0
Original line number Diff line number Diff line
@@ -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: