b13c5b5db2
Differential Revision: https://reviews.freebsd.org/D4019
882 lines
22 KiB
C
882 lines
22 KiB
C
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/*
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* ng_ether.c
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*/
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/*-
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* Copyright (c) 1996-2000 Whistle Communications, Inc.
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* All rights reserved.
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*
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* Subject to the following obligations and disclaimer of warranty, use and
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* redistribution of this software, in source or object code forms, with or
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* without modifications are expressly permitted by Whistle Communications;
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* provided, however, that:
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* 1. Any and all reproductions of the source or object code must include the
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* copyright notice above and the following disclaimer of warranties; and
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* 2. No rights are granted, in any manner or form, to use Whistle
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* Communications, Inc. trademarks, including the mark "WHISTLE
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* COMMUNICATIONS" on advertising, endorsements, or otherwise except as
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* such appears in the above copyright notice or in the software.
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*
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* THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
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* TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
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* REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
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* INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
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* WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
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* REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
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* SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
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* IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
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* RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
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* WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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* PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* Authors: Archie Cobbs <archie@freebsd.org>
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* Julian Elischer <julian@freebsd.org>
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*
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* $FreeBSD$
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*/
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/*
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* ng_ether(4) netgraph node type
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*/
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#include <sys/param.h>
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#include <sys/eventhandler.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/errno.h>
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#include <sys/proc.h>
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#include <sys/syslog.h>
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#include <sys/socket.h>
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#include <sys/taskqueue.h>
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#include <net/if.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_arp.h>
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#include <net/if_var.h>
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#include <net/ethernet.h>
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#include <net/if_bridgevar.h>
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#include <net/vnet.h>
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#include <netgraph/ng_message.h>
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#include <netgraph/netgraph.h>
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#include <netgraph/ng_parse.h>
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#include <netgraph/ng_ether.h>
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MODULE_VERSION(ng_ether, 1);
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#define IFP2NG(ifp) ((ifp)->if_l2com)
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/* Per-node private data */
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struct private {
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struct ifnet *ifp; /* associated interface */
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hook_p upper; /* upper hook connection */
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hook_p lower; /* lower hook connection */
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hook_p orphan; /* orphan hook connection */
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u_char autoSrcAddr; /* always overwrite source address */
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u_char promisc; /* promiscuous mode enabled */
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u_long hwassist; /* hardware checksum capabilities */
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u_int flags; /* flags e.g. really die */
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};
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typedef struct private *priv_p;
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/* Hook pointers used by if_ethersubr.c to callback to netgraph */
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extern void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp);
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extern void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m);
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extern int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp);
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extern void (*ng_ether_attach_p)(struct ifnet *ifp);
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extern void (*ng_ether_detach_p)(struct ifnet *ifp);
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extern void (*ng_ether_link_state_p)(struct ifnet *ifp, int state);
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/* Functional hooks called from if_ethersubr.c */
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static void ng_ether_input(struct ifnet *ifp, struct mbuf **mp);
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static void ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m);
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static int ng_ether_output(struct ifnet *ifp, struct mbuf **mp);
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static void ng_ether_attach(struct ifnet *ifp);
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static void ng_ether_detach(struct ifnet *ifp);
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static void ng_ether_link_state(struct ifnet *ifp, int state);
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/* Other functions */
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static int ng_ether_rcv_lower(hook_p node, item_p item);
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static int ng_ether_rcv_upper(hook_p node, item_p item);
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/* Netgraph node methods */
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static ng_constructor_t ng_ether_constructor;
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static ng_rcvmsg_t ng_ether_rcvmsg;
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static ng_shutdown_t ng_ether_shutdown;
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static ng_newhook_t ng_ether_newhook;
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static ng_rcvdata_t ng_ether_rcvdata;
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static ng_disconnect_t ng_ether_disconnect;
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static int ng_ether_mod_event(module_t mod, int event, void *data);
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static eventhandler_tag ng_ether_ifnet_arrival_cookie;
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/* List of commands and how to convert arguments to/from ASCII */
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static const struct ng_cmdlist ng_ether_cmdlist[] = {
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{
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NGM_ETHER_COOKIE,
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NGM_ETHER_GET_IFNAME,
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"getifname",
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NULL,
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&ng_parse_string_type
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},
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{
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NGM_ETHER_COOKIE,
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NGM_ETHER_GET_IFINDEX,
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"getifindex",
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NULL,
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&ng_parse_int32_type
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},
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{
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NGM_ETHER_COOKIE,
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NGM_ETHER_GET_ENADDR,
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"getenaddr",
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NULL,
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&ng_parse_enaddr_type
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},
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{
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NGM_ETHER_COOKIE,
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NGM_ETHER_SET_ENADDR,
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"setenaddr",
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&ng_parse_enaddr_type,
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NULL
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},
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{
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NGM_ETHER_COOKIE,
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NGM_ETHER_GET_PROMISC,
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"getpromisc",
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NULL,
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&ng_parse_int32_type
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},
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{
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NGM_ETHER_COOKIE,
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NGM_ETHER_SET_PROMISC,
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"setpromisc",
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&ng_parse_int32_type,
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NULL
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},
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{
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NGM_ETHER_COOKIE,
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NGM_ETHER_GET_AUTOSRC,
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"getautosrc",
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NULL,
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&ng_parse_int32_type
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},
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{
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NGM_ETHER_COOKIE,
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NGM_ETHER_SET_AUTOSRC,
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"setautosrc",
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&ng_parse_int32_type,
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NULL
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},
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{
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NGM_ETHER_COOKIE,
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NGM_ETHER_ADD_MULTI,
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"addmulti",
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&ng_parse_enaddr_type,
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NULL
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},
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{
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NGM_ETHER_COOKIE,
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NGM_ETHER_DEL_MULTI,
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"delmulti",
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&ng_parse_enaddr_type,
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NULL
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},
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{
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NGM_ETHER_COOKIE,
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NGM_ETHER_DETACH,
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"detach",
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NULL,
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NULL
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},
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{ 0 }
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};
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static struct ng_type ng_ether_typestruct = {
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.version = NG_ABI_VERSION,
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.name = NG_ETHER_NODE_TYPE,
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.mod_event = ng_ether_mod_event,
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.constructor = ng_ether_constructor,
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.rcvmsg = ng_ether_rcvmsg,
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.shutdown = ng_ether_shutdown,
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.newhook = ng_ether_newhook,
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.rcvdata = ng_ether_rcvdata,
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.disconnect = ng_ether_disconnect,
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.cmdlist = ng_ether_cmdlist,
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};
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NETGRAPH_INIT(ether, &ng_ether_typestruct);
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/******************************************************************
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UTILITY FUNCTIONS
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******************************************************************/
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static void
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ng_ether_sanitize_ifname(const char *ifname, char *name)
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{
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int i;
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for (i = 0; i < IFNAMSIZ; i++) {
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if (ifname[i] == '.' || ifname[i] == ':')
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name[i] = '_';
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else
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name[i] = ifname[i];
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if (name[i] == '\0')
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break;
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}
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}
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/******************************************************************
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ETHERNET FUNCTION HOOKS
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******************************************************************/
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/*
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* Handle a packet that has come in on an interface. We get to
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* look at it here before any upper layer protocols do.
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*/
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static void
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ng_ether_input(struct ifnet *ifp, struct mbuf **mp)
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{
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const node_p node = IFP2NG(ifp);
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const priv_p priv = NG_NODE_PRIVATE(node);
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int error;
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/* If "lower" hook not connected, let packet continue */
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if (priv->lower == NULL)
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return;
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NG_SEND_DATA_ONLY(error, priv->lower, *mp); /* sets *mp = NULL */
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}
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/*
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* Handle a packet that has come in on an interface, and which
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* does not match any of our known protocols (an ``orphan'').
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*/
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static void
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ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m)
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{
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const node_p node = IFP2NG(ifp);
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const priv_p priv = NG_NODE_PRIVATE(node);
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int error;
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/* If "orphan" hook not connected, discard packet */
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if (priv->orphan == NULL) {
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m_freem(m);
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return;
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}
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NG_SEND_DATA_ONLY(error, priv->orphan, m);
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}
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/*
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* Handle a packet that is going out on an interface.
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* The Ethernet header is already attached to the mbuf.
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*/
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static int
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ng_ether_output(struct ifnet *ifp, struct mbuf **mp)
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{
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const node_p node = IFP2NG(ifp);
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const priv_p priv = NG_NODE_PRIVATE(node);
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int error = 0;
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/* If "upper" hook not connected, let packet continue */
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if (priv->upper == NULL)
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return (0);
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/* Send it out "upper" hook */
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NG_OUTBOUND_THREAD_REF();
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NG_SEND_DATA_ONLY(error, priv->upper, *mp);
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NG_OUTBOUND_THREAD_UNREF();
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return (error);
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}
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/*
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* A new Ethernet interface has been attached.
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* Create a new node for it, etc.
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*/
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static void
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ng_ether_attach(struct ifnet *ifp)
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{
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char name[IFNAMSIZ];
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priv_p priv;
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node_p node;
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/*
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* Do not create / attach an ether node to this ifnet if
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* a netgraph node with the same name already exists.
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* This should prevent ether nodes to become attached to
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* eiface nodes, which may be problematic due to naming
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* clashes.
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*/
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if ((node = ng_name2noderef(NULL, ifp->if_xname)) != NULL) {
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NG_NODE_UNREF(node);
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return;
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}
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/* Create node */
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KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__));
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if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) {
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log(LOG_ERR, "%s: can't %s for %s\n",
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__func__, "create node", ifp->if_xname);
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return;
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}
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/* Allocate private data */
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priv = malloc(sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
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if (priv == NULL) {
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log(LOG_ERR, "%s: can't %s for %s\n",
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__func__, "allocate memory", ifp->if_xname);
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NG_NODE_UNREF(node);
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return;
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}
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NG_NODE_SET_PRIVATE(node, priv);
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priv->ifp = ifp;
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IFP2NG(ifp) = node;
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priv->hwassist = ifp->if_hwassist;
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/* Try to give the node the same name as the interface */
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ng_ether_sanitize_ifname(ifp->if_xname, name);
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if (ng_name_node(node, name) != 0)
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log(LOG_WARNING, "%s: can't name node %s\n", __func__, name);
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}
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/*
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* An Ethernet interface is being detached.
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* REALLY Destroy its node.
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*/
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static void
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ng_ether_detach(struct ifnet *ifp)
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{
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const node_p node = IFP2NG(ifp);
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const priv_p priv = NG_NODE_PRIVATE(node);
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taskqueue_drain(taskqueue_swi, &ifp->if_linktask);
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NG_NODE_REALLY_DIE(node); /* Force real removal of node */
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/*
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* We can't assume the ifnet is still around when we run shutdown
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* So zap it now. XXX We HOPE that anything running at this time
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* handles it (as it should in the non netgraph case).
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*/
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IFP2NG(ifp) = NULL;
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priv->ifp = NULL; /* XXX race if interrupted an output packet */
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ng_rmnode_self(node); /* remove all netgraph parts */
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}
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/*
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* Notify graph about link event.
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* if_link_state_change() has already checked that the state has changed.
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*/
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static void
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ng_ether_link_state(struct ifnet *ifp, int state)
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{
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const node_p node = IFP2NG(ifp);
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const priv_p priv = NG_NODE_PRIVATE(node);
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struct ng_mesg *msg;
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int cmd, dummy_error = 0;
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if (state == LINK_STATE_UP)
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cmd = NGM_LINK_IS_UP;
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else if (state == LINK_STATE_DOWN)
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cmd = NGM_LINK_IS_DOWN;
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else
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return;
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if (priv->lower != NULL) {
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NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT);
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if (msg != NULL)
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NG_SEND_MSG_HOOK(dummy_error, node, msg, priv->lower, 0);
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}
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if (priv->orphan != NULL) {
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NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT);
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if (msg != NULL)
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NG_SEND_MSG_HOOK(dummy_error, node, msg, priv->orphan, 0);
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}
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}
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/*
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* Interface arrival notification handler.
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* The notification is produced in two cases:
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* o a new interface arrives
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* o an existing interface got renamed
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* Currently the first case is handled by ng_ether_attach via special
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* hook ng_ether_attach_p.
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*/
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static void
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ng_ether_ifnet_arrival_event(void *arg __unused, struct ifnet *ifp)
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{
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char name[IFNAMSIZ];
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node_p node;
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/* Only ethernet interfaces are of interest. */
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if (ifp->if_type != IFT_ETHER
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&& ifp->if_type != IFT_L2VLAN)
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return;
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/*
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* Just return if it's a new interface without an ng_ether companion.
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*/
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node = IFP2NG(ifp);
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if (node == NULL)
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return;
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/* Try to give the node the same name as the new interface name */
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ng_ether_sanitize_ifname(ifp->if_xname, name);
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if (ng_name_node(node, name) != 0)
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log(LOG_WARNING, "%s: can't re-name node %s\n", __func__, name);
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}
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/******************************************************************
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NETGRAPH NODE METHODS
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******************************************************************/
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/*
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* It is not possible or allowable to create a node of this type.
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* Nodes get created when the interface is attached (or, when
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* this node type's KLD is loaded).
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*/
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static int
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ng_ether_constructor(node_p node)
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{
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return (EINVAL);
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}
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/*
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* Check for attaching a new hook.
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*/
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static int
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ng_ether_newhook(node_p node, hook_p hook, const char *name)
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{
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const priv_p priv = NG_NODE_PRIVATE(node);
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hook_p *hookptr;
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/* Divert hook is an alias for lower */
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if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0)
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name = NG_ETHER_HOOK_LOWER;
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/* Which hook? */
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if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0) {
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hookptr = &priv->upper;
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NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_upper);
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NG_HOOK_SET_TO_INBOUND(hook);
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} else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) {
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hookptr = &priv->lower;
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NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_lower);
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} else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) {
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hookptr = &priv->orphan;
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NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_lower);
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} else
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return (EINVAL);
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/* Check if already connected (shouldn't be, but doesn't hurt) */
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if (*hookptr != NULL)
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return (EISCONN);
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/* Disable hardware checksums while 'upper' hook is connected */
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if (hookptr == &priv->upper)
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priv->ifp->if_hwassist = 0;
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NG_HOOK_HI_STACK(hook);
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/* OK */
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*hookptr = hook;
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return (0);
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}
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/*
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* Receive an incoming control message.
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*/
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static int
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ng_ether_rcvmsg(node_p node, item_p item, hook_p lasthook)
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{
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const priv_p priv = NG_NODE_PRIVATE(node);
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struct ng_mesg *resp = NULL;
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int error = 0;
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struct ng_mesg *msg;
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NGI_GET_MSG(item, msg);
|
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switch (msg->header.typecookie) {
|
|
case NGM_ETHER_COOKIE:
|
|
switch (msg->header.cmd) {
|
|
case NGM_ETHER_GET_IFNAME:
|
|
NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
|
|
if (resp == NULL) {
|
|
error = ENOMEM;
|
|
break;
|
|
}
|
|
strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ);
|
|
break;
|
|
case NGM_ETHER_GET_IFINDEX:
|
|
NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
|
|
if (resp == NULL) {
|
|
error = ENOMEM;
|
|
break;
|
|
}
|
|
*((u_int32_t *)resp->data) = priv->ifp->if_index;
|
|
break;
|
|
case NGM_ETHER_GET_ENADDR:
|
|
NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT);
|
|
if (resp == NULL) {
|
|
error = ENOMEM;
|
|
break;
|
|
}
|
|
bcopy(IF_LLADDR(priv->ifp),
|
|
resp->data, ETHER_ADDR_LEN);
|
|
break;
|
|
case NGM_ETHER_SET_ENADDR:
|
|
{
|
|
if (msg->header.arglen != ETHER_ADDR_LEN) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
error = if_setlladdr(priv->ifp,
|
|
(u_char *)msg->data, ETHER_ADDR_LEN);
|
|
if (error == 0)
|
|
EVENTHANDLER_INVOKE(iflladdr_event, priv->ifp);
|
|
break;
|
|
}
|
|
case NGM_ETHER_GET_PROMISC:
|
|
NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
|
|
if (resp == NULL) {
|
|
error = ENOMEM;
|
|
break;
|
|
}
|
|
*((u_int32_t *)resp->data) = priv->promisc;
|
|
break;
|
|
case NGM_ETHER_SET_PROMISC:
|
|
{
|
|
u_char want;
|
|
|
|
if (msg->header.arglen != sizeof(u_int32_t)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
want = !!*((u_int32_t *)msg->data);
|
|
if (want ^ priv->promisc) {
|
|
if ((error = ifpromisc(priv->ifp, want)) != 0)
|
|
break;
|
|
priv->promisc = want;
|
|
}
|
|
break;
|
|
}
|
|
case NGM_ETHER_GET_AUTOSRC:
|
|
NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
|
|
if (resp == NULL) {
|
|
error = ENOMEM;
|
|
break;
|
|
}
|
|
*((u_int32_t *)resp->data) = priv->autoSrcAddr;
|
|
break;
|
|
case NGM_ETHER_SET_AUTOSRC:
|
|
if (msg->header.arglen != sizeof(u_int32_t)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
priv->autoSrcAddr = !!*((u_int32_t *)msg->data);
|
|
break;
|
|
case NGM_ETHER_ADD_MULTI:
|
|
{
|
|
struct sockaddr_dl sa_dl;
|
|
struct ifmultiaddr *ifma;
|
|
|
|
if (msg->header.arglen != ETHER_ADDR_LEN) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
bzero(&sa_dl, sizeof(struct sockaddr_dl));
|
|
sa_dl.sdl_len = sizeof(struct sockaddr_dl);
|
|
sa_dl.sdl_family = AF_LINK;
|
|
sa_dl.sdl_alen = ETHER_ADDR_LEN;
|
|
bcopy((void *)msg->data, LLADDR(&sa_dl),
|
|
ETHER_ADDR_LEN);
|
|
/*
|
|
* Netgraph is only permitted to join groups once
|
|
* via the if_addmulti() KPI, because it cannot hold
|
|
* struct ifmultiaddr * between calls. It may also
|
|
* lose a race while we check if the membership
|
|
* already exists.
|
|
*/
|
|
if_maddr_rlock(priv->ifp);
|
|
ifma = if_findmulti(priv->ifp,
|
|
(struct sockaddr *)&sa_dl);
|
|
if_maddr_runlock(priv->ifp);
|
|
if (ifma != NULL) {
|
|
error = EADDRINUSE;
|
|
} else {
|
|
error = if_addmulti(priv->ifp,
|
|
(struct sockaddr *)&sa_dl, &ifma);
|
|
}
|
|
break;
|
|
}
|
|
case NGM_ETHER_DEL_MULTI:
|
|
{
|
|
struct sockaddr_dl sa_dl;
|
|
|
|
if (msg->header.arglen != ETHER_ADDR_LEN) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
bzero(&sa_dl, sizeof(struct sockaddr_dl));
|
|
sa_dl.sdl_len = sizeof(struct sockaddr_dl);
|
|
sa_dl.sdl_family = AF_LINK;
|
|
sa_dl.sdl_alen = ETHER_ADDR_LEN;
|
|
bcopy((void *)msg->data, LLADDR(&sa_dl),
|
|
ETHER_ADDR_LEN);
|
|
error = if_delmulti(priv->ifp,
|
|
(struct sockaddr *)&sa_dl);
|
|
break;
|
|
}
|
|
case NGM_ETHER_DETACH:
|
|
ng_ether_detach(priv->ifp);
|
|
break;
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
break;
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
NG_RESPOND_MSG(error, node, item, resp);
|
|
NG_FREE_MSG(msg);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Receive data on a hook.
|
|
* Since we use per-hook recveive methods this should never be called.
|
|
*/
|
|
static int
|
|
ng_ether_rcvdata(hook_p hook, item_p item)
|
|
{
|
|
NG_FREE_ITEM(item);
|
|
|
|
panic("%s: weird hook", __func__);
|
|
}
|
|
|
|
/*
|
|
* Handle an mbuf received on the "lower" or "orphan" hook.
|
|
*/
|
|
static int
|
|
ng_ether_rcv_lower(hook_p hook, item_p item)
|
|
{
|
|
struct mbuf *m;
|
|
const node_p node = NG_HOOK_NODE(hook);
|
|
const priv_p priv = NG_NODE_PRIVATE(node);
|
|
struct ifnet *const ifp = priv->ifp;
|
|
|
|
NGI_GET_M(item, m);
|
|
NG_FREE_ITEM(item);
|
|
|
|
/* Check whether interface is ready for packets */
|
|
|
|
if (!((ifp->if_flags & IFF_UP) &&
|
|
(ifp->if_drv_flags & IFF_DRV_RUNNING))) {
|
|
NG_FREE_M(m);
|
|
return (ENETDOWN);
|
|
}
|
|
|
|
/* Make sure header is fully pulled up */
|
|
if (m->m_pkthdr.len < sizeof(struct ether_header)) {
|
|
NG_FREE_M(m);
|
|
return (EINVAL);
|
|
}
|
|
if (m->m_len < sizeof(struct ether_header)
|
|
&& (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
|
|
return (ENOBUFS);
|
|
|
|
/* Drop in the MAC address if desired */
|
|
if (priv->autoSrcAddr) {
|
|
|
|
/* Make the mbuf writable if it's not already */
|
|
if (!M_WRITABLE(m)
|
|
&& (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
|
|
return (ENOBUFS);
|
|
|
|
/* Overwrite source MAC address */
|
|
bcopy(IF_LLADDR(ifp),
|
|
mtod(m, struct ether_header *)->ether_shost,
|
|
ETHER_ADDR_LEN);
|
|
}
|
|
|
|
/* Send it on its way */
|
|
return ether_output_frame(ifp, m);
|
|
}
|
|
|
|
/*
|
|
* Handle an mbuf received on the "upper" hook.
|
|
*/
|
|
static int
|
|
ng_ether_rcv_upper(hook_p hook, item_p item)
|
|
{
|
|
struct mbuf *m;
|
|
const node_p node = NG_HOOK_NODE(hook);
|
|
const priv_p priv = NG_NODE_PRIVATE(node);
|
|
struct ifnet *ifp = priv->ifp;
|
|
|
|
NGI_GET_M(item, m);
|
|
NG_FREE_ITEM(item);
|
|
|
|
/* Check length and pull off header */
|
|
if (m->m_pkthdr.len < sizeof(struct ether_header)) {
|
|
NG_FREE_M(m);
|
|
return (EINVAL);
|
|
}
|
|
if (m->m_len < sizeof(struct ether_header) &&
|
|
(m = m_pullup(m, sizeof(struct ether_header))) == NULL)
|
|
return (ENOBUFS);
|
|
|
|
m->m_pkthdr.rcvif = ifp;
|
|
|
|
/* Pass the packet to the bridge, it may come back to us */
|
|
if (ifp->if_bridge) {
|
|
BRIDGE_INPUT(ifp, m);
|
|
if (m == NULL)
|
|
return (0);
|
|
}
|
|
|
|
/* Route packet back in */
|
|
ether_demux(ifp, m);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Shutdown node. This resets the node but does not remove it
|
|
* unless the REALLY_DIE flag is set.
|
|
*/
|
|
static int
|
|
ng_ether_shutdown(node_p node)
|
|
{
|
|
const priv_p priv = NG_NODE_PRIVATE(node);
|
|
|
|
if (node->nd_flags & NGF_REALLY_DIE) {
|
|
/*
|
|
* WE came here because the ethernet card is being unloaded,
|
|
* so stop being persistant.
|
|
* Actually undo all the things we did on creation.
|
|
* Assume the ifp has already been freed.
|
|
*/
|
|
NG_NODE_SET_PRIVATE(node, NULL);
|
|
free(priv, M_NETGRAPH);
|
|
NG_NODE_UNREF(node); /* free node itself */
|
|
return (0);
|
|
}
|
|
if (priv->promisc) { /* disable promiscuous mode */
|
|
(void)ifpromisc(priv->ifp, 0);
|
|
priv->promisc = 0;
|
|
}
|
|
NG_NODE_REVIVE(node); /* Signal ng_rmnode we are persisant */
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Hook disconnection.
|
|
*/
|
|
static int
|
|
ng_ether_disconnect(hook_p hook)
|
|
{
|
|
const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
|
|
|
|
if (hook == priv->upper) {
|
|
priv->upper = NULL;
|
|
if (priv->ifp != NULL) /* restore h/w csum */
|
|
priv->ifp->if_hwassist = priv->hwassist;
|
|
} else if (hook == priv->lower)
|
|
priv->lower = NULL;
|
|
else if (hook == priv->orphan)
|
|
priv->orphan = NULL;
|
|
else
|
|
panic("%s: weird hook", __func__);
|
|
if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
|
|
&& (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
|
|
ng_rmnode_self(NG_HOOK_NODE(hook)); /* reset node */
|
|
return (0);
|
|
}
|
|
|
|
/******************************************************************
|
|
INITIALIZATION
|
|
******************************************************************/
|
|
|
|
/*
|
|
* Handle loading and unloading for this node type.
|
|
*/
|
|
static int
|
|
ng_ether_mod_event(module_t mod, int event, void *data)
|
|
{
|
|
int error = 0;
|
|
|
|
switch (event) {
|
|
case MOD_LOAD:
|
|
|
|
/* Register function hooks */
|
|
if (ng_ether_attach_p != NULL) {
|
|
error = EEXIST;
|
|
break;
|
|
}
|
|
ng_ether_attach_p = ng_ether_attach;
|
|
ng_ether_detach_p = ng_ether_detach;
|
|
ng_ether_output_p = ng_ether_output;
|
|
ng_ether_input_p = ng_ether_input;
|
|
ng_ether_input_orphan_p = ng_ether_input_orphan;
|
|
ng_ether_link_state_p = ng_ether_link_state;
|
|
|
|
ng_ether_ifnet_arrival_cookie =
|
|
EVENTHANDLER_REGISTER(ifnet_arrival_event,
|
|
ng_ether_ifnet_arrival_event, NULL, EVENTHANDLER_PRI_ANY);
|
|
break;
|
|
|
|
case MOD_UNLOAD:
|
|
|
|
/*
|
|
* Note that the base code won't try to unload us until
|
|
* all nodes have been removed, and that can't happen
|
|
* until all Ethernet interfaces are removed. In any
|
|
* case, we know there are no nodes left if the action
|
|
* is MOD_UNLOAD, so there's no need to detach any nodes.
|
|
*/
|
|
|
|
EVENTHANDLER_DEREGISTER(ifnet_arrival_event,
|
|
ng_ether_ifnet_arrival_cookie);
|
|
|
|
/* Unregister function hooks */
|
|
ng_ether_attach_p = NULL;
|
|
ng_ether_detach_p = NULL;
|
|
ng_ether_output_p = NULL;
|
|
ng_ether_input_p = NULL;
|
|
ng_ether_input_orphan_p = NULL;
|
|
ng_ether_link_state_p = NULL;
|
|
break;
|
|
|
|
default:
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
vnet_ng_ether_init(const void *unused)
|
|
{
|
|
struct ifnet *ifp;
|
|
|
|
/* If module load was rejected, don't attach to vnets. */
|
|
if (ng_ether_attach_p != ng_ether_attach)
|
|
return;
|
|
|
|
/* Create nodes for any already-existing Ethernet interfaces. */
|
|
IFNET_RLOCK();
|
|
TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
|
|
if (ifp->if_type == IFT_ETHER
|
|
|| ifp->if_type == IFT_L2VLAN)
|
|
ng_ether_attach(ifp);
|
|
}
|
|
IFNET_RUNLOCK();
|
|
}
|
|
VNET_SYSINIT(vnet_ng_ether_init, SI_SUB_PSEUDO, SI_ORDER_ANY,
|
|
vnet_ng_ether_init, NULL);
|