671 lines
16 KiB
C
671 lines
16 KiB
C
/*-
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*
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* Copyright (c) 1999-2001, Vitaly V Belekhov
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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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/errno.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/sockio.h>
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#include <sys/socket.h>
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#include <sys/syslog.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/netisr.h>
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#include <netinet/in.h>
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#include <netinet/if_ether.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_eiface.h>
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#include <net/bpf.h>
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#include <net/ethernet.h>
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#include <net/if_arp.h>
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static const struct ng_parse_struct_field ng_eiface_par_fields[]
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= NG_EIFACE_PAR_FIELDS;
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static const struct ng_parse_type ng_eiface_par_type = {
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&ng_parse_struct_type,
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&ng_eiface_par_fields
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};
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static const struct ng_cmdlist ng_eiface_cmdlist[] = {
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{
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NGM_EIFACE_COOKIE,
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NGM_EIFACE_SET,
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"set",
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&ng_eiface_par_type,
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NULL
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},
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{ 0 }
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};
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/* Node private data */
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struct ng_eiface_private {
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struct ifnet *ifp; /* This interface */
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int unit; /* Interface unit number */
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struct arpcom arpcom; /* per-interface network data */
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node_p node; /* Our netgraph node */
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hook_p ether; /* Hook for ethernet stream */
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};
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typedef struct ng_eiface_private *priv_p;
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/* Interface methods */
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static void ng_eiface_init(void *xsc);
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static void ng_eiface_start(struct ifnet *ifp);
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static int ng_eiface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
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#ifdef DEBUG
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static void ng_eiface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
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#endif
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/* Netgraph methods */
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static ng_constructor_t ng_eiface_constructor;
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static ng_rcvmsg_t ng_eiface_rcvmsg;
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static ng_shutdown_t ng_eiface_rmnode;
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static ng_newhook_t ng_eiface_newhook;
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static ng_rcvdata_t ng_eiface_rcvdata;
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static ng_connect_t ng_eiface_connect;
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static ng_disconnect_t ng_eiface_disconnect;
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/* Node type descriptor */
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static struct ng_type typestruct = {
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NG_ABI_VERSION,
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NG_EIFACE_NODE_TYPE,
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NULL,
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ng_eiface_constructor,
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ng_eiface_rcvmsg,
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ng_eiface_rmnode,
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ng_eiface_newhook,
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NULL,
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ng_eiface_connect,
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ng_eiface_rcvdata,
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ng_eiface_disconnect,
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ng_eiface_cmdlist
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};
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NETGRAPH_INIT(eiface, &typestruct);
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static char ng_eiface_ifname[] = NG_EIFACE_EIFACE_NAME;
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/* We keep a bitmap indicating which unit numbers are free.
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One means the unit number is free, zero means it's taken. */
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static int *ng_eiface_units = NULL;
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static int ng_eiface_units_len = 0;
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static int ng_units_in_use = 0;
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#define UNITS_BITSPERWORD (sizeof(*ng_eiface_units) * NBBY)
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/************************************************************************
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HELPER STUFF
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************************************************************************/
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/*
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* Find the first free unit number for a new interface.
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* Increase the size of the unit bitmap as necessary.
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*/
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static __inline__ int
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ng_eiface_get_unit(int *unit)
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{
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int index, bit;
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for (index = 0; index < ng_eiface_units_len
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&& ng_eiface_units[index] == 0; index++);
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if (index == ng_eiface_units_len) { /* extend array */
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int i, *newarray, newlen;
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newlen = (2 * ng_eiface_units_len) + 4;
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MALLOC(newarray, int *, newlen * sizeof(*ng_eiface_units),
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M_NETGRAPH, M_NOWAIT);
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if (newarray == NULL)
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return (ENOMEM);
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bcopy(ng_eiface_units, newarray,
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ng_eiface_units_len * sizeof(*ng_eiface_units));
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for (i = ng_eiface_units_len; i < newlen; i++)
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newarray[i] = ~0;
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if (ng_eiface_units != NULL)
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FREE(ng_eiface_units, M_NETGRAPH);
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ng_eiface_units = newarray;
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ng_eiface_units_len = newlen;
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}
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bit = ffs(ng_eiface_units[index]) - 1;
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KASSERT(bit >= 0 && bit <= UNITS_BITSPERWORD - 1,
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("%s: word=%d bit=%d", __func__, ng_eiface_units[index], bit));
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ng_eiface_units[index] &= ~(1 << bit);
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*unit = (index * UNITS_BITSPERWORD) + bit;
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ng_units_in_use++;
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return (0);
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}
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/*
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* Free a no longer needed unit number.
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*/
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static __inline__ void
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ng_eiface_free_unit(int unit)
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{
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int index, bit;
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index = unit / UNITS_BITSPERWORD;
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bit = unit % UNITS_BITSPERWORD;
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KASSERT(index < ng_eiface_units_len,
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("%s: unit=%d len=%d", __func__, unit, ng_eiface_units_len));
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KASSERT((ng_eiface_units[index] & (1 << bit)) == 0,
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("%s: unit=%d is free", __func__, unit));
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ng_eiface_units[index] |= (1 << bit);
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/*
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* XXX We could think about reducing the size of ng_eiface_units[]
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* XXX here if the last portion is all ones
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* XXX At least free it if no more units.
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* Needed if we are to eventually be able to unload.
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*/
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ng_units_in_use--;
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if (ng_units_in_use == 0) { /* XXX make SMP safe */
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FREE(ng_eiface_units, M_NETGRAPH);
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ng_eiface_units_len = 0;
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ng_eiface_units = NULL;
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}
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}
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/************************************************************************
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INTERFACE STUFF
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************************************************************************/
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/*
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* Process an ioctl for the virtual interface
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*/
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static int
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ng_eiface_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
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{
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struct ifreq *const ifr = (struct ifreq *)data;
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int s, error = 0;
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#ifdef DEBUG
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ng_eiface_print_ioctl(ifp, command, data);
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#endif
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s = splimp();
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switch (command)
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{
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/* These two are mostly handled at a higher layer */
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case SIOCSIFADDR:
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error = ether_ioctl(ifp, command, data);
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break;
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case SIOCGIFADDR:
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break;
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/* Set flags */
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case SIOCSIFFLAGS:
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/*
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* If the interface is marked up and stopped, then
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* start it. If it is marked down and running,
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* then stop it.
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*/
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if (ifr->ifr_flags & IFF_UP) {
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if (!(ifp->if_flags & IFF_RUNNING)) {
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ifp->if_flags &= ~(IFF_OACTIVE);
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ifp->if_flags |= IFF_RUNNING;
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}
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} else {
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if (ifp->if_flags & IFF_RUNNING)
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ifp->if_flags
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&= ~(IFF_RUNNING | IFF_OACTIVE);
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}
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break;
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/* Set the interface MTU */
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case SIOCSIFMTU:
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if (ifr->ifr_mtu > NG_EIFACE_MTU_MAX
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|| ifr->ifr_mtu < NG_EIFACE_MTU_MIN)
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error = EINVAL;
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else
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ifp->if_mtu = ifr->ifr_mtu;
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break;
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/* Stuff that's not supported */
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case SIOCADDMULTI:
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case SIOCDELMULTI:
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error = 0;
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break;
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case SIOCSIFPHYS:
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error = EOPNOTSUPP;
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break;
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default:
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error = EINVAL;
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break;
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}
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(void)splx(s);
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return (error);
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}
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static void
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ng_eiface_init(void *xsc)
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{
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priv_p sc = xsc;
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struct ifnet *ifp = sc->ifp;
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int s;
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s = splimp();
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ifp->if_flags |= IFF_RUNNING;
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ifp->if_flags &= ~IFF_OACTIVE;
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splx(s);
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}
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/*
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* We simply relay the packet to the ether hook, if it is connected.
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* We have been throughthe netgraph locking an are guaranteed to
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* be the only code running in this node at this time.
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*/
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static void
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ng_eiface_start2(node_p node, hook_p hook, void *arg1, int arg2)
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{
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struct ifnet *ifp = arg1;
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const priv_p priv = (priv_p) ifp->if_softc;
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int len, error = 0;
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struct mbuf *m;
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/* Check interface flags */
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if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING))
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return;
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/* Don't do anything if output is active */
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if (ifp->if_flags & IFF_OACTIVE)
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return;
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ifp->if_flags |= IFF_OACTIVE;
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/*
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* Grab a packet to transmit.
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*/
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IF_DEQUEUE(&ifp->if_snd, m);
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/* If there's nothing to send, return. */
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if (m == NULL) {
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ifp->if_flags &= ~IFF_OACTIVE;
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return;
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}
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/* Berkeley packet filter
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* Pass packet to bpf if there is a listener.
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* XXX is this safe? locking?
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*/
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BPF_MTAP(ifp, m);
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/* Copy length before the mbuf gets invalidated */
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len = m->m_pkthdr.len;
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/*
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* Send packet; if hook is not connected, mbuf will get
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* freed.
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*/
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NG_SEND_DATA_ONLY(error, priv->ether, m);
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/* Update stats */
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if (error == 0) {
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ifp->if_obytes += len;
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ifp->if_opackets++;
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}
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ifp->if_flags &= ~IFF_OACTIVE;
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return;
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}
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/*
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* This routine is called to deliver a packet out the interface.
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* We simply queue the netgraph version to be called when netgraph locking
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* allows it to happen.
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* Until we know what the rest of the networking code is doing for
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* locking, we don't know how we will interact with it.
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* Take comfort from the fact that the ifnet struct is part of our
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* private info and can't go away while we are queued.
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* [Though we don't know it is still there now....]
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* it is possible we don't gain anything from this because
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* we would like to get the mbuf and queue it as data
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* somehow, but we can't and if we did would we solve anything?
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*/
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static void
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ng_eiface_start(struct ifnet *ifp)
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{
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const priv_p priv = (priv_p) ifp->if_softc;
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ng_send_fn(priv->node, NULL, &ng_eiface_start2, ifp, 0);
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}
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#ifdef DEBUG
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/*
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* Display an ioctl to the virtual interface
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*/
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static void
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ng_eiface_print_ioctl(struct ifnet *ifp, int command, caddr_t data){
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char *str;
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switch (command & IOC_DIRMASK)
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{
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case IOC_VOID:
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str = "IO";
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break;
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case IOC_OUT:
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str = "IOR";
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break;
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case IOC_IN:
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str = "IOW";
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break;
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case IOC_INOUT:
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str = "IORW";
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break;
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default:
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str = "IO??";
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}
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log(LOG_DEBUG, "%s%d: %s('%c', %d, char[%d])\n",
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ifp->if_name, ifp->if_unit,
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str,
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IOCGROUP(command),
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command & 0xff,
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IOCPARM_LEN(command));
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}
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#endif /* DEBUG */
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/************************************************************************
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NETGRAPH NODE STUFF
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************************************************************************/
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/*
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* Constructor for a node
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*/
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static int
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ng_eiface_constructor(node_p node)
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{
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struct ifnet *ifp;
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priv_p priv;
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int error = 0;
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/* Allocate node and interface private structures */
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MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_WAITOK);
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if (priv == NULL) {
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return (ENOMEM);
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}
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bzero(priv, sizeof(*priv));
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ifp = &(priv->arpcom.ac_if);
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/* Link them together */
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ifp->if_softc = priv;
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priv->ifp = ifp;
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/* Get an interface unit number */
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if ((error = ng_eiface_get_unit(&priv->unit)) != 0) {
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FREE(priv, M_NETGRAPH);
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return (error);
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}
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/* Link together node and private info */
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NG_NODE_SET_PRIVATE(node, priv);
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priv->node = node;
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/* Initialize interface structure */
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ifp->if_name = ng_eiface_ifname;
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ifp->if_unit = priv->unit;
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ifp->if_init = ng_eiface_init;
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ifp->if_output = ether_output;
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ifp->if_start = ng_eiface_start;
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ifp->if_ioctl = ng_eiface_ioctl;
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ifp->if_watchdog = NULL;
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ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
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ifp->if_flags = (IFF_SIMPLEX | IFF_BROADCAST | IFF_MULTICAST);
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/*
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* Give this node name * bzero(ifname, sizeof(ifname));
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* sprintf(ifname, "if%s%d", ifp->if_name, ifp->if_unit); (void)
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* ng_name_node(node, ifname);
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*/
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/* Attach the interface */
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ether_ifattach(ifp, priv->arpcom.ac_enaddr);
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/* Done */
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return (0);
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}
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/*
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* Give our ok for a hook to be added
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*/
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static int
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ng_eiface_newhook(node_p node, hook_p hook, const char *name)
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{
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priv_p priv = NG_NODE_PRIVATE(node);
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if (strcmp(name, NG_EIFACE_HOOK_ETHER))
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return (EPFNOSUPPORT);
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if (priv->ether != NULL)
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return (EISCONN);
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priv->ether = hook;
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NG_HOOK_SET_PRIVATE(hook, &priv->ether);
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return (0);
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}
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/*
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* Receive a control message
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*/
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static int
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ng_eiface_rcvmsg(node_p node, item_p item, hook_p lasthook)
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{
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priv_p priv = NG_NODE_PRIVATE(node);
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struct ifnet *const ifp = priv->ifp;
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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) {
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case NGM_EIFACE_COOKIE:
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switch (msg->header.cmd) {
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case NGM_EIFACE_SET:
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{
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struct ng_eiface_par *eaddr;
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struct ifaddr *ifa;
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struct sockaddr_dl *sdl;
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if (msg->header.arglen != sizeof(struct ng_eiface_par)){
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error = EINVAL;
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break;
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}
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eaddr = (struct ng_eiface_par *)(msg->data);
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priv->arpcom.ac_enaddr[0] = eaddr->oct0;
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priv->arpcom.ac_enaddr[1] = eaddr->oct1;
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priv->arpcom.ac_enaddr[2] = eaddr->oct2;
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priv->arpcom.ac_enaddr[3] = eaddr->oct3;
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priv->arpcom.ac_enaddr[4] = eaddr->oct4;
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priv->arpcom.ac_enaddr[5] = eaddr->oct5;
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/* And put it in the ifaddr list */
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#define IFP2AC(IFP) ((struct arpcom *)IFP)
|
|
TAILQ_FOREACH(ifa, &(ifp->if_addrhead), ifa_link) {
|
|
sdl = (struct sockaddr_dl *)ifa->ifa_addr;
|
|
if (sdl->sdl_type == IFT_ETHER) {
|
|
bcopy((IFP2AC(ifp))->ac_enaddr,
|
|
LLADDR(sdl), ifp->if_addrlen);
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
case NGM_EIFACE_GET_IFNAME:
|
|
{
|
|
struct ng_eiface_ifname *arg;
|
|
|
|
NG_MKRESPONSE(resp, msg, sizeof(*arg), M_NOWAIT);
|
|
if (resp == NULL) {
|
|
error = ENOMEM;
|
|
break;
|
|
}
|
|
arg = (struct ng_eiface_ifname *)resp->data;
|
|
sprintf(arg->ngif_name,
|
|
"%s%d", ifp->if_name, ifp->if_unit);
|
|
break;
|
|
}
|
|
|
|
case NGM_EIFACE_GET_IFADDRS:
|
|
{
|
|
struct ifaddr *ifa;
|
|
caddr_t ptr;
|
|
int buflen;
|
|
|
|
#define SA_SIZE(s) ((s)->sa_len<sizeof(*(s))? sizeof(*(s)):(s)->sa_len)
|
|
|
|
/* Determine size of response and allocate it */
|
|
buflen = 0;
|
|
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
|
|
buflen += SA_SIZE(ifa->ifa_addr);
|
|
NG_MKRESPONSE(resp, msg, buflen, M_NOWAIT);
|
|
if (resp == NULL) {
|
|
error = ENOMEM;
|
|
break;
|
|
}
|
|
/* Add addresses */
|
|
ptr = resp->data;
|
|
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
|
|
const int len = SA_SIZE(ifa->ifa_addr);
|
|
|
|
if (buflen < len) {
|
|
log(LOG_ERR, "%s%d: len changed?\n",
|
|
ifp->if_name, ifp->if_unit);
|
|
break;
|
|
}
|
|
bcopy(ifa->ifa_addr, ptr, len);
|
|
ptr += len;
|
|
buflen -= len;
|
|
}
|
|
break;
|
|
#undef SA_SIZE
|
|
}
|
|
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
} /* end of inner switch() */
|
|
break;
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
NG_RESPOND_MSG(error, node, item, resp);
|
|
NG_FREE_MSG(msg);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Recive data from a hook. Pass the packet to the ether_input routine.
|
|
*/
|
|
static int
|
|
ng_eiface_rcvdata(hook_p hook, item_p item)
|
|
{
|
|
priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
|
|
struct ifnet *const ifp = priv->ifp;
|
|
struct mbuf *m;
|
|
|
|
NGI_GET_M(item, m);
|
|
/* Meta-data ends its life here... */
|
|
NG_FREE_ITEM(item);
|
|
|
|
if (m == NULL)
|
|
{
|
|
printf("ng_eiface: mbuf is null.\n");
|
|
return (EINVAL);
|
|
}
|
|
if (!(ifp->if_flags & IFF_UP)) {
|
|
return (ENETDOWN);
|
|
}
|
|
|
|
/* Note receiving interface */
|
|
m->m_pkthdr.rcvif = ifp;
|
|
|
|
/* Update interface stats */
|
|
ifp->if_ipackets++;
|
|
|
|
(*ifp->if_input)(ifp, m);
|
|
|
|
/* Done */
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* the node.
|
|
*/
|
|
static int
|
|
ng_eiface_rmnode(node_p node)
|
|
{
|
|
priv_p priv = NG_NODE_PRIVATE(node);
|
|
struct ifnet *const ifp = priv->ifp;
|
|
|
|
ether_ifdetach(ifp);
|
|
ng_eiface_free_unit(priv->unit);
|
|
FREE(priv, M_NETGRAPH);
|
|
NG_NODE_SET_PRIVATE(node, NULL);
|
|
NG_NODE_UNREF(node);
|
|
return (0);
|
|
}
|
|
|
|
|
|
/*
|
|
* This is called once we've already connected a new hook to the other node.
|
|
* It gives us a chance to balk at the last minute.
|
|
*/
|
|
static int
|
|
ng_eiface_connect(hook_p hook)
|
|
{
|
|
/* be really amiable and just say "YUP that's OK by me! " */
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Hook disconnection
|
|
*/
|
|
static int
|
|
ng_eiface_disconnect(hook_p hook)
|
|
{
|
|
priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
|
|
|
|
priv->ether = NULL;
|
|
return (0);
|
|
}
|