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6b79597012
Use it to implement (hopefully) SMP safe node/hook addition and removal. Fix some debug stuff.
836 lines
21 KiB
C
836 lines
21 KiB
C
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/*
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* ng_ether.c
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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/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/syslog.h>
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#include <sys/socket.h>
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#include <net/if.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 <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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#define IFP2AC(IFP) ((struct arpcom *)IFP)
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#define IFP2NG(ifp) ((struct ng_node *)((struct arpcom *)(ifp))->ac_netgraph)
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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 OR orphan hook connection */
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u_char lowerOrphan; /* whether lower is lower or orphan */
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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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};
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typedef struct private *priv_p;
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/* Functional hooks called from if_ethersubr.c */
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static void ng_ether_input(struct ifnet *ifp,
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struct mbuf **mp, struct ether_header *eh);
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static void ng_ether_input_orphan(struct ifnet *ifp,
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struct mbuf *m, struct ether_header *eh);
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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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/* Other functions */
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static void ng_ether_input2(node_p node,
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struct mbuf **mp, struct ether_header *eh);
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static int ng_ether_glueback_header(struct mbuf **mp,
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struct ether_header *eh);
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static int ng_ether_rcv_lower(node_p node, struct mbuf *m, meta_p meta);
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static int ng_ether_rcv_upper(node_p node, struct mbuf *m, meta_p meta);
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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_connect_t ng_ether_connect;
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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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/* Parse type for an Ethernet address */
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static ng_parse_t ng_enaddr_parse;
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static ng_unparse_t ng_enaddr_unparse;
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const struct ng_parse_type ng_ether_enaddr_type = {
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NULL,
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NULL,
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NULL,
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ng_enaddr_parse,
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ng_enaddr_unparse,
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NULL, /* no such thing as a "default" EN address */
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0
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};
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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_ether_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_ether_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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{ 0 }
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};
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static struct ng_type ng_ether_typestruct = {
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NG_ABI_VERSION,
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NG_ETHER_NODE_TYPE,
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ng_ether_mod_event,
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ng_ether_constructor,
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ng_ether_rcvmsg,
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ng_ether_shutdown,
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ng_ether_newhook,
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NULL,
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ng_ether_connect,
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ng_ether_rcvdata,
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ng_ether_disconnect,
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ng_ether_cmdlist,
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};
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MODULE_VERSION(ng_ether, 1);
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NETGRAPH_INIT(ether, &ng_ether_typestruct);
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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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* NOTE: this function will get called at splimp()
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*/
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static void
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ng_ether_input(struct ifnet *ifp,
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struct mbuf **mp, struct ether_header *eh)
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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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/* If "lower" hook not connected, let packet continue */
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if (priv->lower == NULL || priv->lowerOrphan)
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return;
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ng_ether_input2(node, mp, eh);
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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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* NOTE: this function will get called at splimp()
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*/
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static void
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ng_ether_input_orphan(struct ifnet *ifp,
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struct mbuf *m, struct ether_header *eh)
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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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/* If "orphan" hook not connected, let packet continue */
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if (priv->lower == NULL || !priv->lowerOrphan) {
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m_freem(m);
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return;
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}
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ng_ether_input2(node, &m, eh);
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if (m != NULL)
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m_freem(m);
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}
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/*
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* Handle a packet that has come in on an ethernet interface.
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* The Ethernet header has already been detached from the mbuf,
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* so we have to put it back.
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*
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* NOTE: this function will get called at splimp()
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*/
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static void
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ng_ether_input2(node_p node, struct mbuf **mp, struct ether_header *eh)
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{
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const priv_p priv = NG_NODE_PRIVATE(node);
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int error;
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/* Glue Ethernet header back on */
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if ((error = ng_ether_glueback_header(mp, eh)) != 0)
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return;
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/* Send out lower/orphan hook */
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NG_SEND_DATA_ONLY(error, priv->lower, *mp);
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*mp = NULL;
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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_SEND_DATA_ONLY(error, priv->upper, *mp);
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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 + 1];
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priv_p priv;
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node_p node;
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/* Create node */
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KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __FUNCTION__));
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snprintf(name, sizeof(name), "%s%d", ifp->if_name, ifp->if_unit);
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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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__FUNCTION__, "create node", name);
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return;
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}
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/* Allocate private data */
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MALLOC(priv, priv_p, 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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__FUNCTION__, "allocate memory", name);
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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->autoSrcAddr = 1;
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/* Try to give the node the same name as the interface */
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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",
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__FUNCTION__, name);
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}
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}
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/*
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* An Ethernet interface is being detached.
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* 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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priv_p priv;
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if (node == NULL) /* no node (why not?), ignore */
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return;
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ng_rmnode_self(node); /* break all links to other nodes */
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IFP2NG(ifp) = NULL; /* detach node from interface */
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priv = NG_NODE_PRIVATE(node); /* free node private info */
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bzero(priv, sizeof(*priv));
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FREE(priv, M_NETGRAPH);
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NG_NODE_SET_PRIVATE(node, NULL);
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NG_NODE_UNREF(node); /* free node itself */
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}
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/*
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* Optimization for gluing the Ethernet header back onto
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* the front of an incoming packet.
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*/
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static int
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ng_ether_glueback_header(struct mbuf **mp, struct ether_header *eh)
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{
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struct mbuf *m = *mp;
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uintfptr_t room;
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int error = 0;
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/*
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* Possibly the header is already on the front.
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* If this is the case so just move the markers back
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* to re-include it. We lucked out.
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* This allows us to avoid a yucky m_pullup
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* in later nodes if it works.
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*/
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if (eh == mtod(m, struct ether_header *) - 1) {
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m->m_len += sizeof(*eh);
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m->m_data -= sizeof(*eh);
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m->m_pkthdr.len += sizeof(*eh);
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goto done;
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}
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/*
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* Alternatively there may be room even though
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* it is stored somewhere else. If so, copy it in.
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* This only safe because we KNOW that this packet has
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* just been generated by an ethernet card, so there are
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* no aliases to the buffer (not so for outgoing packets).
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* Nearly all ethernet cards will end up producing mbufs
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* that fall into these cases. So we are not optimizing
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* contorted cases.
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*/
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if ((m->m_flags & M_EXT) != 0) {
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room = mtod(m, caddr_t) - m->m_ext.ext_buf;
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if (room > m->m_ext.ext_size) /* garbage, fail immediately */
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room = 0;
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} else
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room = mtod(m, caddr_t) - m->m_pktdat;
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/*
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* If we have room, just copy it and adjust
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*/
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if (room >= sizeof(*eh)) {
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m->m_len += sizeof(*eh);
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m->m_data -= sizeof(*eh);
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m->m_pkthdr.len += sizeof(*eh);
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goto copy;
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}
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/*
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* Doing anything more is likely to get more
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* expensive than it's worth..
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* it's probable that everything else is in one
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* big lump. The next node will do an m_pullup()
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* for exactly the amount of data it needs and
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* hopefully everything after that will not
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* need one. So let's just use M_PREPEND.
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*/
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M_PREPEND(m, sizeof (*eh), M_DONTWAIT);
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if (m == NULL) {
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error = ENOBUFS;
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goto done;
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}
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copy:
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/* Copy header and return (possibly new) mbuf */
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bcopy((caddr_t)eh, mtod(m, struct ether_header *), sizeof(*eh));
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done:
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*mp = m;
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return error;
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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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u_char orphan = priv->lowerOrphan;
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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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else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) {
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hookptr = &priv->lower;
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orphan = 0;
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} else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) {
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hookptr = &priv->lower;
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orphan = 1;
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} else
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return (EINVAL);
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|
|
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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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|
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/* OK */
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*hookptr = hook;
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priv->lowerOrphan = orphan;
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return (0);
|
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}
|
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|
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/*
|
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* Hooks are attached, adjust to force queueing.
|
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* We don't really care which hook it is.
|
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* they should all be queuing for outgoing data.
|
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*/
|
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static int
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ng_ether_connect(hook_p hook)
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{
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NG_HOOK_FORCE_QUEUE(NG_HOOK_PEER(hook));
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return (0);
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}
|
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|
|
/*
|
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* Receive an incoming control message.
|
|
*/
|
|
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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|
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NGI_GET_MSG(item, msg);
|
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switch (msg->header.typecookie) {
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case NGM_ETHER_COOKIE:
|
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switch (msg->header.cmd) {
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case NGM_ETHER_GET_IFNAME:
|
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NG_MKRESPONSE(resp, msg, IFNAMSIZ + 1, M_NOWAIT);
|
|
if (resp == NULL) {
|
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error = ENOMEM;
|
|
break;
|
|
}
|
|
snprintf(resp->data, IFNAMSIZ + 1,
|
|
"%s%d", priv->ifp->if_name, priv->ifp->if_unit);
|
|
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((IFP2AC(priv->ifp))->ac_enaddr,
|
|
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);
|
|
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;
|
|
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.
|
|
*/
|
|
static int
|
|
ng_ether_rcvdata(hook_p hook, item_p item)
|
|
{
|
|
const node_p node = NG_HOOK_NODE(hook);
|
|
const priv_p priv = NG_NODE_PRIVATE(node);
|
|
struct mbuf *m;
|
|
meta_p meta;
|
|
|
|
NGI_GET_M(item, m);
|
|
NGI_GET_META(item, meta);
|
|
NG_FREE_ITEM(item);
|
|
if (hook == priv->lower)
|
|
return ng_ether_rcv_lower(node, m, meta);
|
|
if (hook == priv->upper)
|
|
return ng_ether_rcv_upper(node, m, meta);
|
|
panic("%s: weird hook", __FUNCTION__);
|
|
}
|
|
|
|
/*
|
|
* Handle an mbuf received on the "lower" hook.
|
|
*/
|
|
static int
|
|
ng_ether_rcv_lower(node_p node, struct mbuf *m, meta_p meta)
|
|
{
|
|
const priv_p priv = NG_NODE_PRIVATE(node);
|
|
|
|
/* Make sure header is fully pulled up */
|
|
if (m->m_pkthdr.len < sizeof(struct ether_header)) {
|
|
NG_FREE_M(m);
|
|
NG_FREE_META(meta);
|
|
return (EINVAL);
|
|
}
|
|
if (m->m_len < sizeof(struct ether_header)
|
|
&& (m = m_pullup(m, sizeof(struct ether_header))) == NULL) {
|
|
NG_FREE_META(meta);
|
|
return (ENOBUFS);
|
|
}
|
|
|
|
/* Drop in the MAC address if desired */
|
|
if (priv->autoSrcAddr) {
|
|
bcopy((IFP2AC(priv->ifp))->ac_enaddr,
|
|
mtod(m, struct ether_header *)->ether_shost,
|
|
ETHER_ADDR_LEN);
|
|
}
|
|
|
|
/* Send it on its way */
|
|
NG_FREE_META(meta);
|
|
return ether_output_frame(priv->ifp, m);
|
|
}
|
|
|
|
/*
|
|
* Handle an mbuf received on the "upper" hook.
|
|
*/
|
|
static int
|
|
ng_ether_rcv_upper(node_p node, struct mbuf *m, meta_p meta)
|
|
{
|
|
const priv_p priv = NG_NODE_PRIVATE(node);
|
|
struct ether_header *eh;
|
|
|
|
/* Check length and pull off header */
|
|
if (m->m_pkthdr.len < sizeof(*eh)) {
|
|
NG_FREE_M(m);
|
|
NG_FREE_META(meta);
|
|
return (EINVAL);
|
|
}
|
|
if (m->m_len < sizeof(*eh) && (m = m_pullup(m, sizeof(*eh))) == NULL) {
|
|
NG_FREE_META(meta);
|
|
return (ENOBUFS);
|
|
}
|
|
eh = mtod(m, struct ether_header *);
|
|
m->m_data += sizeof(*eh);
|
|
m->m_len -= sizeof(*eh);
|
|
m->m_pkthdr.len -= sizeof(*eh);
|
|
m->m_pkthdr.rcvif = priv->ifp;
|
|
|
|
/* Route packet back in */
|
|
NG_FREE_META(meta);
|
|
ether_demux(priv->ifp, eh, m);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Shutdown node. This resets the node but does not remove it.
|
|
* Actually it produces a new node. XXX The problem is what to do when
|
|
* the node really DOES need to go away,
|
|
* or if our re-make of the node fails.
|
|
*/
|
|
static int
|
|
ng_ether_shutdown(node_p node)
|
|
{
|
|
char name[IFNAMSIZ + 1];
|
|
const priv_p priv = NG_NODE_PRIVATE(node);
|
|
|
|
if (priv->promisc) { /* disable promiscuous mode */
|
|
(void)ifpromisc(priv->ifp, 0);
|
|
priv->promisc = 0;
|
|
}
|
|
NG_NODE_UNREF(node);
|
|
snprintf(name, sizeof(name), "%s%d", priv->ifp->if_name, priv->ifp->if_unit);
|
|
if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) {
|
|
log(LOG_ERR, "%s: can't %s for %s\n",
|
|
__FUNCTION__, "create node", name);
|
|
return (ENOMEM);
|
|
}
|
|
|
|
/* Allocate private data */
|
|
NG_NODE_SET_PRIVATE(node, priv);
|
|
IFP2NG(priv->ifp) = node;
|
|
priv->autoSrcAddr = 1; /* reset auto-src-addr flag */
|
|
|
|
/* Try to give the node the same name as the interface */
|
|
if (ng_name_node(node, name) != 0) {
|
|
log(LOG_WARNING, "%s: can't name node %s\n",
|
|
__FUNCTION__, name);
|
|
}
|
|
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;
|
|
else if (hook == priv->lower) {
|
|
priv->lower = NULL;
|
|
priv->lowerOrphan = 0;
|
|
} else
|
|
panic("%s: weird hook", __FUNCTION__);
|
|
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);
|
|
}
|
|
|
|
static int
|
|
ng_enaddr_parse(const struct ng_parse_type *type,
|
|
const char *s, int *const off, const u_char *const start,
|
|
u_char *const buf, int *const buflen)
|
|
{
|
|
char *eptr;
|
|
u_long val;
|
|
int i;
|
|
|
|
if (*buflen < ETHER_ADDR_LEN)
|
|
return (ERANGE);
|
|
for (i = 0; i < ETHER_ADDR_LEN; i++) {
|
|
val = strtoul(s + *off, &eptr, 16);
|
|
if (val > 0xff || eptr == s + *off)
|
|
return (EINVAL);
|
|
buf[i] = (u_char)val;
|
|
*off = (eptr - s);
|
|
if (i < ETHER_ADDR_LEN - 1) {
|
|
if (*eptr != ':')
|
|
return (EINVAL);
|
|
(*off)++;
|
|
}
|
|
}
|
|
*buflen = ETHER_ADDR_LEN;
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
ng_enaddr_unparse(const struct ng_parse_type *type,
|
|
const u_char *data, int *off, char *cbuf, int cbuflen)
|
|
{
|
|
int len;
|
|
|
|
len = snprintf(cbuf, cbuflen, "%02x:%02x:%02x:%02x:%02x:%02x",
|
|
data[*off], data[*off + 1], data[*off + 2],
|
|
data[*off + 3], data[*off + 4], data[*off + 5]);
|
|
if (len >= cbuflen)
|
|
return (ERANGE);
|
|
*off += ETHER_ADDR_LEN;
|
|
return (0);
|
|
}
|
|
|
|
/******************************************************************
|
|
INITIALIZATION
|
|
******************************************************************/
|
|
|
|
/*
|
|
* Handle loading and unloading for this node type.
|
|
*/
|
|
static int
|
|
ng_ether_mod_event(module_t mod, int event, void *data)
|
|
{
|
|
struct ifnet *ifp;
|
|
int error = 0;
|
|
int s;
|
|
|
|
s = splnet();
|
|
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;
|
|
|
|
/* Create nodes for any already-existing Ethernet interfaces */
|
|
TAILQ_FOREACH(ifp, &ifnet, if_link) {
|
|
if (ifp->if_type == IFT_ETHER)
|
|
ng_ether_attach(ifp);
|
|
}
|
|
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.
|
|
*/
|
|
|
|
/* 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;
|
|
break;
|
|
|
|
default:
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
}
|
|
splx(s);
|
|
return (error);
|
|
}
|
|
|