656 lines
17 KiB
C
656 lines
17 KiB
C
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/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2019 Isilon Systems, LLC.
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* Copyright (c) 2005-2014 Sandvine Incorporated. All rights reserved.
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* Copyright (c) 2000 Darrell Anderson
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_inet.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/endian.h>
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#include <sys/errno.h>
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#include <sys/socket.h>
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#include <sys/sysctl.h>
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#include <net/ethernet.h>
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#include <net/if.h>
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#include <net/if_arp.h>
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#include <net/if_dl.h>
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#include <net/if_types.h>
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#include <net/if_var.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/in_var.h>
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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <netinet/ip_options.h>
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#include <netinet/udp.h>
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#include <netinet/udp_var.h>
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#include <machine/in_cksum.h>
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#include <machine/pcb.h>
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#include <net/debugnet.h>
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#define DEBUGNET_INTERNAL
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#include <net/debugnet_int.h>
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FEATURE(debugnet, "Debugnet support");
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SYSCTL_NODE(_net, OID_AUTO, debugnet, CTLFLAG_RD, NULL,
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"debugnet parameters");
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unsigned debugnet_debug;
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SYSCTL_UINT(_net_debugnet, OID_AUTO, debug, CTLFLAG_RWTUN,
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&debugnet_debug, 0,
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"Debug message verbosity (0: off; 1: on; 2: verbose)");
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int debugnet_npolls = 2000;
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SYSCTL_INT(_net_debugnet, OID_AUTO, npolls, CTLFLAG_RWTUN,
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&debugnet_npolls, 0,
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"Number of times to poll before assuming packet loss (0.5ms per poll)");
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int debugnet_nretries = 10;
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SYSCTL_INT(_net_debugnet, OID_AUTO, nretries, CTLFLAG_RWTUN,
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&debugnet_nretries, 0,
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"Number of retransmit attempts before giving up");
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static bool g_debugnet_pcb_inuse;
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static struct debugnet_pcb g_dnet_pcb;
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/*
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* Simple accessors for opaque PCB.
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*/
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const unsigned char *
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debugnet_get_gw_mac(const struct debugnet_pcb *pcb)
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{
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MPASS(g_debugnet_pcb_inuse && pcb == &g_dnet_pcb &&
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pcb->dp_state >= DN_STATE_HAVE_GW_MAC);
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return (pcb->dp_gw_mac.octet);
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}
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/*
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* Start of network primitives, beginning with output primitives.
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*/
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/*
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* Handles creation of the ethernet header, then places outgoing packets into
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* the tx buffer for the NIC
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*
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* Parameters:
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* m The mbuf containing the packet to be sent (will be freed by
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* this function or the NIC driver)
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* ifp The interface to send on
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* dst The destination ethernet address (source address will be looked
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* up using ifp)
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* etype The ETHERTYPE_* value for the protocol that is being sent
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*
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* Returns:
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* int see errno.h, 0 for success
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*/
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int
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debugnet_ether_output(struct mbuf *m, struct ifnet *ifp, struct ether_addr dst,
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u_short etype)
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{
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struct ether_header *eh;
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if (((ifp->if_flags & (IFF_MONITOR | IFF_UP)) != IFF_UP) ||
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(ifp->if_drv_flags & IFF_DRV_RUNNING) != IFF_DRV_RUNNING) {
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if_printf(ifp, "%s: interface isn't up\n", __func__);
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m_freem(m);
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return (ENETDOWN);
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}
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/* Fill in the ethernet header. */
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M_PREPEND(m, ETHER_HDR_LEN, M_NOWAIT);
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if (m == NULL) {
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printf("%s: out of mbufs\n", __func__);
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return (ENOBUFS);
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}
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eh = mtod(m, struct ether_header *);
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memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN);
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memcpy(eh->ether_dhost, dst.octet, ETHER_ADDR_LEN);
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eh->ether_type = htons(etype);
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return (ifp->if_debugnet_methods->dn_transmit(ifp, m));
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}
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/*
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* Unreliable transmission of an mbuf chain to the debugnet server
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* Note: can't handle fragmentation; fails if the packet is larger than
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* ifp->if_mtu after adding the UDP/IP headers
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*
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* Parameters:
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* pcb The debugnet context block
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* m mbuf chain
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*
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* Returns:
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* int see errno.h, 0 for success
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*/
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static int
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debugnet_udp_output(struct debugnet_pcb *pcb, struct mbuf *m)
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{
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struct udphdr *udp;
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MPASS(pcb->dp_state >= DN_STATE_HAVE_GW_MAC);
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M_PREPEND(m, sizeof(*udp), M_NOWAIT);
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if (m == NULL) {
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printf("%s: out of mbufs\n", __func__);
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return (ENOBUFS);
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}
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udp = mtod(m, void *);
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udp->uh_ulen = htons(m->m_pkthdr.len);
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/* Use this src port so that the server can connect() the socket */
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udp->uh_sport = htons(pcb->dp_client_ack_port);
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udp->uh_dport = htons(pcb->dp_server_port);
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/* Computed later (protocol-dependent). */
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udp->uh_sum = 0;
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return (debugnet_ip_output(pcb, m));
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}
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/*
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* Dummy free function for debugnet clusters.
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*/
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static void
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debugnet_mbuf_free(struct mbuf *m __unused)
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{
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}
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/*
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* Construct and reliably send a debugnet packet. May fail from a resource
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* shortage or extreme number of unacknowledged retransmissions. Wait for
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* an acknowledgement before returning. Splits packets into chunks small
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* enough to be sent without fragmentation (looks up the interface MTU)
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*
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* Parameters:
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* type debugnet packet type (HERALD, FINISHED, ...)
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* data data
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* datalen data size (bytes)
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* auxdata optional auxiliary information
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*
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* Returns:
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* int see errno.h, 0 for success
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*/
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int
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debugnet_send(struct debugnet_pcb *pcb, uint32_t type, const void *data,
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uint32_t datalen, const struct debugnet_proto_aux *auxdata)
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{
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struct debugnet_msg_hdr *dn_msg_hdr;
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struct mbuf *m, *m2;
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uint64_t want_acks;
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uint32_t i, pktlen, sent_so_far;
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int retries, polls, error;
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want_acks = 0;
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pcb->dp_rcvd_acks = 0;
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retries = 0;
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retransmit:
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/* Chunks can be too big to fit in packets. */
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for (i = sent_so_far = 0; sent_so_far < datalen ||
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(i == 0 && datalen == 0); i++) {
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pktlen = datalen - sent_so_far;
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/* Bound: the interface MTU (assume no IP options). */
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pktlen = min(pktlen, pcb->dp_ifp->if_mtu -
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sizeof(struct udpiphdr) - sizeof(struct debugnet_msg_hdr));
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/*
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* Check if it is retransmitting and this has been ACKed
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* already.
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*/
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if ((pcb->dp_rcvd_acks & (1 << i)) != 0) {
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sent_so_far += pktlen;
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continue;
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}
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/*
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* Get and fill a header mbuf, then chain data as an extended
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* mbuf.
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*/
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m = m_gethdr(M_NOWAIT, MT_DATA);
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if (m == NULL) {
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printf("%s: Out of mbufs\n", __func__);
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return (ENOBUFS);
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}
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m->m_len = sizeof(struct debugnet_msg_hdr);
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m->m_pkthdr.len = sizeof(struct debugnet_msg_hdr);
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MH_ALIGN(m, sizeof(struct debugnet_msg_hdr));
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dn_msg_hdr = mtod(m, struct debugnet_msg_hdr *);
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dn_msg_hdr->mh_seqno = htonl(pcb->dp_seqno + i);
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dn_msg_hdr->mh_type = htonl(type);
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dn_msg_hdr->mh_len = htonl(pktlen);
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if (auxdata != NULL) {
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dn_msg_hdr->mh_offset =
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htobe64(auxdata->dp_offset_start + sent_so_far);
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dn_msg_hdr->mh_aux2 = htobe32(auxdata->dp_aux2);
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} else {
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dn_msg_hdr->mh_offset = htobe64(sent_so_far);
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dn_msg_hdr->mh_aux2 = 0;
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}
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if (pktlen != 0) {
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m2 = m_get(M_NOWAIT, MT_DATA);
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if (m2 == NULL) {
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m_freem(m);
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printf("%s: Out of mbufs\n", __func__);
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return (ENOBUFS);
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}
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MEXTADD(m2, __DECONST(char *, data) + sent_so_far,
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pktlen, debugnet_mbuf_free, NULL, NULL, 0,
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EXT_DISPOSABLE);
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m2->m_len = pktlen;
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m_cat(m, m2);
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m->m_pkthdr.len += pktlen;
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}
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error = debugnet_udp_output(pcb, m);
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if (error != 0)
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return (error);
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/* Note that we're waiting for this packet in the bitfield. */
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want_acks |= (1 << i);
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sent_so_far += pktlen;
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}
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if (i >= DEBUGNET_MAX_IN_FLIGHT)
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printf("Warning: Sent more than %d packets (%d). "
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"Acknowledgements will fail unless the size of "
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"rcvd_acks/want_acks is increased.\n",
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DEBUGNET_MAX_IN_FLIGHT, i);
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/*
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* Wait for acks. A *real* window would speed things up considerably.
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*/
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polls = 0;
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while (pcb->dp_rcvd_acks != want_acks) {
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if (polls++ > debugnet_npolls) {
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if (retries++ > debugnet_nretries)
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return (ETIMEDOUT);
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printf(". ");
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goto retransmit;
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}
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debugnet_network_poll(pcb->dp_ifp);
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DELAY(500);
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}
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pcb->dp_seqno += i;
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return (0);
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}
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/*
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* Network input primitives.
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*/
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static void
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debugnet_handle_ack(struct debugnet_pcb *pcb, struct mbuf **mb, uint16_t sport)
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{
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const struct debugnet_ack *dn_ack;
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struct mbuf *m;
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uint32_t rcv_ackno;
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m = *mb;
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if (m->m_pkthdr.len < sizeof(*dn_ack)) {
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DNETDEBUG("ignoring small ACK packet\n");
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return;
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}
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/* Get Ack. */
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if (m->m_len < sizeof(*dn_ack)) {
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m = m_pullup(m, sizeof(*dn_ack));
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*mb = m;
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if (m == NULL) {
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DNETDEBUG("m_pullup failed\n");
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return;
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}
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}
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dn_ack = mtod(m, const void *);
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/* Debugnet processing. */
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/*
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* Packet is meant for us. Extract the ack sequence number and the
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* port number if necessary.
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*/
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rcv_ackno = ntohl(dn_ack->da_seqno);
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if (pcb->dp_state < DN_STATE_GOT_HERALD_PORT) {
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pcb->dp_server_port = sport;
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pcb->dp_state = DN_STATE_GOT_HERALD_PORT;
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}
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if (rcv_ackno >= pcb->dp_seqno + DEBUGNET_MAX_IN_FLIGHT)
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printf("%s: ACK %u too far in future!\n", __func__, rcv_ackno);
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else if (rcv_ackno >= pcb->dp_seqno) {
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/* We're interested in this ack. Record it. */
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pcb->dp_rcvd_acks |= 1 << (rcv_ackno - pcb->dp_seqno);
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}
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}
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void
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debugnet_handle_udp(struct debugnet_pcb *pcb, struct mbuf **mb)
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{
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const struct udphdr *udp;
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struct mbuf *m;
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uint16_t sport;
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/* UDP processing. */
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m = *mb;
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if (m->m_pkthdr.len < sizeof(*udp)) {
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DNETDEBUG("ignoring small UDP packet\n");
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return;
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}
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/* Get UDP headers. */
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if (m->m_len < sizeof(*udp)) {
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m = m_pullup(m, sizeof(*udp));
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*mb = m;
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if (m == NULL) {
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DNETDEBUG("m_pullup failed\n");
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return;
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}
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}
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udp = mtod(m, const void *);
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/* For now, the only UDP packets we expect to receive are acks. */
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if (ntohs(udp->uh_dport) != pcb->dp_client_ack_port) {
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DNETDEBUG("not on the expected ACK port.\n");
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return;
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}
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sport = ntohs(udp->uh_sport);
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m_adj(m, sizeof(*udp));
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debugnet_handle_ack(pcb, mb, sport);
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}
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/*
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* Handler for incoming packets directly from the network adapter
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* Identifies the packet type (IP or ARP) and passes it along to one of the
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* helper functions debugnet_handle_ip or debugnet_handle_arp.
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*
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* It needs to partially replicate the behaviour of ether_input() and
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* ether_demux().
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*
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* Parameters:
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* ifp the interface the packet came from
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* m an mbuf containing the packet received
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*/
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static void
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debugnet_pkt_in(struct ifnet *ifp, struct mbuf *m)
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{
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struct ifreq ifr;
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struct ether_header *eh;
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u_short etype;
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/* Ethernet processing. */
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if ((m->m_flags & M_PKTHDR) == 0) {
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DNETDEBUG_IF(ifp, "discard frame without packet header\n");
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goto done;
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}
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if (m->m_len < ETHER_HDR_LEN) {
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DNETDEBUG_IF(ifp,
|
||
|
"discard frame without leading eth header (len %u pktlen %u)\n",
|
||
|
m->m_len, m->m_pkthdr.len);
|
||
|
goto done;
|
||
|
}
|
||
|
if ((m->m_flags & M_HASFCS) != 0) {
|
||
|
m_adj(m, -ETHER_CRC_LEN);
|
||
|
m->m_flags &= ~M_HASFCS;
|
||
|
}
|
||
|
eh = mtod(m, struct ether_header *);
|
||
|
etype = ntohs(eh->ether_type);
|
||
|
if ((m->m_flags & M_VLANTAG) != 0 || etype == ETHERTYPE_VLAN) {
|
||
|
DNETDEBUG_IF(ifp, "ignoring vlan packets\n");
|
||
|
goto done;
|
||
|
}
|
||
|
if (if_gethwaddr(ifp, &ifr) != 0) {
|
||
|
DNETDEBUG_IF(ifp, "failed to get hw addr for interface\n");
|
||
|
goto done;
|
||
|
}
|
||
|
if (memcmp(ifr.ifr_addr.sa_data, eh->ether_dhost,
|
||
|
ETHER_ADDR_LEN) != 0) {
|
||
|
DNETDEBUG_IF(ifp,
|
||
|
"discard frame with incorrect destination addr\n");
|
||
|
goto done;
|
||
|
}
|
||
|
|
||
|
MPASS(g_debugnet_pcb_inuse);
|
||
|
|
||
|
/* Done ethernet processing. Strip off the ethernet header. */
|
||
|
m_adj(m, ETHER_HDR_LEN);
|
||
|
switch (etype) {
|
||
|
case ETHERTYPE_ARP:
|
||
|
debugnet_handle_arp(&g_dnet_pcb, &m);
|
||
|
break;
|
||
|
case ETHERTYPE_IP:
|
||
|
debugnet_handle_ip(&g_dnet_pcb, &m);
|
||
|
break;
|
||
|
default:
|
||
|
DNETDEBUG_IF(ifp, "dropping unknown ethertype %hu\n", etype);
|
||
|
break;
|
||
|
}
|
||
|
done:
|
||
|
if (m != NULL)
|
||
|
m_freem(m);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Network polling primitive.
|
||
|
*
|
||
|
* Instead of assuming that most of the network stack is sane, we just poll the
|
||
|
* driver directly for packets.
|
||
|
*/
|
||
|
void
|
||
|
debugnet_network_poll(struct ifnet *ifp)
|
||
|
{
|
||
|
ifp->if_debugnet_methods->dn_poll(ifp, 1000);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Start of consumer API surface.
|
||
|
*/
|
||
|
void
|
||
|
debugnet_free(struct debugnet_pcb *pcb)
|
||
|
{
|
||
|
struct ifnet *ifp;
|
||
|
|
||
|
MPASS(g_debugnet_pcb_inuse);
|
||
|
MPASS(pcb == &g_dnet_pcb);
|
||
|
|
||
|
ifp = pcb->dp_ifp;
|
||
|
ifp->if_input = pcb->dp_drv_input;
|
||
|
ifp->if_debugnet_methods->dn_event(ifp, DEBUGNET_END);
|
||
|
debugnet_mbuf_finish();
|
||
|
|
||
|
g_debugnet_pcb_inuse = false;
|
||
|
memset(&g_dnet_pcb, 0xfd, sizeof(g_dnet_pcb));
|
||
|
}
|
||
|
|
||
|
int
|
||
|
debugnet_connect(const struct debugnet_conn_params *dcp,
|
||
|
struct debugnet_pcb **pcb_out)
|
||
|
{
|
||
|
struct debugnet_pcb *pcb;
|
||
|
struct ifnet *ifp;
|
||
|
int error;
|
||
|
|
||
|
if (g_debugnet_pcb_inuse) {
|
||
|
printf("%s: Only one connection at a time.\n", __func__);
|
||
|
return (EBUSY);
|
||
|
}
|
||
|
|
||
|
pcb = &g_dnet_pcb;
|
||
|
*pcb = (struct debugnet_pcb) {
|
||
|
.dp_state = DN_STATE_INIT,
|
||
|
.dp_client = dcp->dc_client,
|
||
|
.dp_server = dcp->dc_server,
|
||
|
.dp_gateway = dcp->dc_gateway,
|
||
|
.dp_server_port = dcp->dc_herald_port, /* Initially */
|
||
|
.dp_client_ack_port = dcp->dc_client_ack_port,
|
||
|
.dp_seqno = 1,
|
||
|
.dp_ifp = dcp->dc_ifp,
|
||
|
};
|
||
|
|
||
|
/* Switch to the debugnet mbuf zones. */
|
||
|
debugnet_mbuf_start();
|
||
|
|
||
|
ifp = pcb->dp_ifp;
|
||
|
ifp->if_debugnet_methods->dn_event(ifp, DEBUGNET_START);
|
||
|
|
||
|
/*
|
||
|
* We maintain the invariant that g_debugnet_pcb_inuse is always true
|
||
|
* while the debugnet ifp's if_input is overridden with
|
||
|
* debugnet_pkt_in.
|
||
|
*/
|
||
|
g_debugnet_pcb_inuse = true;
|
||
|
|
||
|
/* Make the card use *our* receive callback. */
|
||
|
pcb->dp_drv_input = ifp->if_input;
|
||
|
ifp->if_input = debugnet_pkt_in;
|
||
|
|
||
|
printf("%s: searching for %s MAC...\n", __func__,
|
||
|
(dcp->dc_gateway == INADDR_ANY) ? "server" : "gateway");
|
||
|
|
||
|
error = debugnet_arp_gw(pcb);
|
||
|
if (error != 0) {
|
||
|
printf("%s: failed to locate MAC address\n", __func__);
|
||
|
goto cleanup;
|
||
|
}
|
||
|
MPASS(pcb->dp_state == DN_STATE_HAVE_GW_MAC);
|
||
|
|
||
|
error = debugnet_send(pcb, DEBUGNET_HERALD, dcp->dc_herald_data,
|
||
|
dcp->dc_herald_datalen, NULL);
|
||
|
if (error != 0) {
|
||
|
printf("%s: failed to herald debugnet server\n", __func__);
|
||
|
goto cleanup;
|
||
|
}
|
||
|
|
||
|
*pcb_out = pcb;
|
||
|
return (0);
|
||
|
|
||
|
cleanup:
|
||
|
debugnet_free(pcb);
|
||
|
return (error);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Pre-allocated dump-time mbuf tracking.
|
||
|
*
|
||
|
* We just track the high water mark we've ever seen and allocate appropriately
|
||
|
* for that iface/mtu combo.
|
||
|
*/
|
||
|
static struct {
|
||
|
int nmbuf;
|
||
|
int ncl;
|
||
|
int clsize;
|
||
|
} dn_hwm;
|
||
|
static struct mtx dn_hwm_lk;
|
||
|
MTX_SYSINIT(debugnet_hwm_lock, &dn_hwm_lk, "Debugnet HWM lock", MTX_DEF);
|
||
|
|
||
|
static void
|
||
|
dn_maybe_reinit_mbufs(int nmbuf, int ncl, int clsize)
|
||
|
{
|
||
|
bool any;
|
||
|
|
||
|
any = false;
|
||
|
mtx_lock(&dn_hwm_lk);
|
||
|
|
||
|
if (nmbuf > dn_hwm.nmbuf) {
|
||
|
any = true;
|
||
|
dn_hwm.nmbuf = nmbuf;
|
||
|
} else
|
||
|
nmbuf = dn_hwm.nmbuf;
|
||
|
|
||
|
if (ncl > dn_hwm.ncl) {
|
||
|
any = true;
|
||
|
dn_hwm.ncl = ncl;
|
||
|
} else
|
||
|
ncl = dn_hwm.ncl;
|
||
|
|
||
|
if (clsize > dn_hwm.clsize) {
|
||
|
any = true;
|
||
|
dn_hwm.clsize = clsize;
|
||
|
} else
|
||
|
clsize = dn_hwm.clsize;
|
||
|
|
||
|
mtx_unlock(&dn_hwm_lk);
|
||
|
|
||
|
if (any)
|
||
|
debugnet_mbuf_reinit(nmbuf, ncl, clsize);
|
||
|
}
|
||
|
|
||
|
void
|
||
|
debugnet_any_ifnet_update(struct ifnet *ifp)
|
||
|
{
|
||
|
int clsize, nmbuf, ncl, nrxr;
|
||
|
|
||
|
if (!DEBUGNET_SUPPORTED_NIC(ifp))
|
||
|
return;
|
||
|
|
||
|
ifp->if_debugnet_methods->dn_init(ifp, &nrxr, &ncl, &clsize);
|
||
|
KASSERT(nrxr > 0, ("invalid receive ring count %d", nrxr));
|
||
|
|
||
|
/*
|
||
|
* We need two headers per message on the transmit side. Multiply by
|
||
|
* four to give us some breathing room.
|
||
|
*/
|
||
|
nmbuf = ncl * (4 + nrxr);
|
||
|
ncl *= nrxr;
|
||
|
|
||
|
dn_maybe_reinit_mbufs(nmbuf, ncl, clsize);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Unfortunately, the ifnet_arrival_event eventhandler hook is mostly useless
|
||
|
* for us because drivers tend to if_attach before invoking DEBUGNET_SET().
|
||
|
*
|
||
|
* On the other hand, hooking DEBUGNET_SET() itself may still be too early,
|
||
|
* because the driver is still in attach. Since we cannot use down interfaces,
|
||
|
* maybe hooking ifnet_event:IFNET_EVENT_UP is sufficient? ... Nope, at least
|
||
|
* with vtnet and dhcpclient that event just never occurs.
|
||
|
*
|
||
|
* So that's how I've landed on the lower level ifnet_link_event.
|
||
|
*/
|
||
|
|
||
|
static void
|
||
|
dn_ifnet_event(void *arg __unused, struct ifnet *ifp, int link_state)
|
||
|
{
|
||
|
if (link_state == LINK_STATE_UP)
|
||
|
debugnet_any_ifnet_update(ifp);
|
||
|
}
|
||
|
|
||
|
static eventhandler_tag dn_attach_cookie;
|
||
|
static void
|
||
|
dn_evh_init(void *ctx __unused)
|
||
|
{
|
||
|
dn_attach_cookie = EVENTHANDLER_REGISTER(ifnet_link_event,
|
||
|
dn_ifnet_event, NULL, EVENTHANDLER_PRI_ANY);
|
||
|
}
|
||
|
SYSINIT(dn_evh_init, SI_SUB_EVENTHANDLER + 1, SI_ORDER_ANY, dn_evh_init, NULL);
|