9f7d0f4830
quite unexpected result of toggling capabilities on the neighbour vlan(4) interfaces. Reviewed by: melifaro, np Differential Revision: https://reviews.freebsd.org/D2310 Sponsored by: Nginx, Inc.
1715 lines
43 KiB
C
1715 lines
43 KiB
C
/*-
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* Copyright 1998 Massachusetts Institute of Technology
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*
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* Permission to use, copy, modify, and distribute this software and
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* its documentation for any purpose and without fee is hereby
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* granted, provided that both the above copyright notice and this
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* permission notice appear in all copies, that both the above
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* copyright notice and this permission notice appear in all
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* supporting documentation, and that the name of M.I.T. not be used
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* in advertising or publicity pertaining to distribution of the
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* software without specific, written prior permission. M.I.T. makes
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* no representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied
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* warranty.
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*
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* THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
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* ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
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* SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* 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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/*
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* if_vlan.c - pseudo-device driver for IEEE 802.1Q virtual LANs.
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* Might be extended some day to also handle IEEE 802.1p priority
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* tagging. This is sort of sneaky in the implementation, since
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* we need to pretend to be enough of an Ethernet implementation
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* to make arp work. The way we do this is by telling everyone
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* that we are an Ethernet, and then catch the packets that
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* ether_output() sends to us via if_transmit(), rewrite them for
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* use by the real outgoing interface, and ask it to send them.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_inet.h"
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#include "opt_vlan.h"
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#include <sys/param.h>
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#include <sys/eventhandler.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/module.h>
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#include <sys/rmlock.h>
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#include <sys/queue.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <sys/sysctl.h>
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#include <sys/systm.h>
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#include <sys/sx.h>
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#include <net/bpf.h>
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#include <net/ethernet.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/if_clone.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_vlan_var.h>
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#include <net/vnet.h>
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#ifdef INET
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#include <netinet/in.h>
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#include <netinet/if_ether.h>
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#endif
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#define VLAN_DEF_HWIDTH 4
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#define VLAN_IFFLAGS (IFF_BROADCAST | IFF_MULTICAST)
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#define UP_AND_RUNNING(ifp) \
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((ifp)->if_flags & IFF_UP && (ifp)->if_drv_flags & IFF_DRV_RUNNING)
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LIST_HEAD(ifvlanhead, ifvlan);
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struct ifvlantrunk {
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struct ifnet *parent; /* parent interface of this trunk */
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struct rmlock lock;
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#ifdef VLAN_ARRAY
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#define VLAN_ARRAY_SIZE (EVL_VLID_MASK + 1)
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struct ifvlan *vlans[VLAN_ARRAY_SIZE]; /* static table */
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#else
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struct ifvlanhead *hash; /* dynamic hash-list table */
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uint16_t hmask;
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uint16_t hwidth;
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#endif
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int refcnt;
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};
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struct vlan_mc_entry {
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struct sockaddr_dl mc_addr;
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SLIST_ENTRY(vlan_mc_entry) mc_entries;
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};
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struct ifvlan {
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struct ifvlantrunk *ifv_trunk;
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struct ifnet *ifv_ifp;
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#define TRUNK(ifv) ((ifv)->ifv_trunk)
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#define PARENT(ifv) ((ifv)->ifv_trunk->parent)
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void *ifv_cookie;
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int ifv_pflags; /* special flags we have set on parent */
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struct ifv_linkmib {
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int ifvm_encaplen; /* encapsulation length */
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int ifvm_mtufudge; /* MTU fudged by this much */
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int ifvm_mintu; /* min transmission unit */
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uint16_t ifvm_proto; /* encapsulation ethertype */
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uint16_t ifvm_tag; /* tag to apply on packets leaving if */
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} ifv_mib;
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SLIST_HEAD(, vlan_mc_entry) vlan_mc_listhead;
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#ifndef VLAN_ARRAY
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LIST_ENTRY(ifvlan) ifv_list;
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#endif
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};
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#define ifv_proto ifv_mib.ifvm_proto
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#define ifv_vid ifv_mib.ifvm_tag
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#define ifv_encaplen ifv_mib.ifvm_encaplen
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#define ifv_mtufudge ifv_mib.ifvm_mtufudge
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#define ifv_mintu ifv_mib.ifvm_mintu
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/* Special flags we should propagate to parent. */
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static struct {
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int flag;
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int (*func)(struct ifnet *, int);
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} vlan_pflags[] = {
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{IFF_PROMISC, ifpromisc},
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{IFF_ALLMULTI, if_allmulti},
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{0, NULL}
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};
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SYSCTL_DECL(_net_link);
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static SYSCTL_NODE(_net_link, IFT_L2VLAN, vlan, CTLFLAG_RW, 0,
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"IEEE 802.1Q VLAN");
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static SYSCTL_NODE(_net_link_vlan, PF_LINK, link, CTLFLAG_RW, 0,
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"for consistency");
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static VNET_DEFINE(int, soft_pad);
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#define V_soft_pad VNET(soft_pad)
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SYSCTL_INT(_net_link_vlan, OID_AUTO, soft_pad, CTLFLAG_RW | CTLFLAG_VNET,
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&VNET_NAME(soft_pad), 0, "pad short frames before tagging");
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static const char vlanname[] = "vlan";
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static MALLOC_DEFINE(M_VLAN, vlanname, "802.1Q Virtual LAN Interface");
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static eventhandler_tag ifdetach_tag;
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static eventhandler_tag iflladdr_tag;
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/*
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* We have a global mutex, that is used to serialize configuration
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* changes and isn't used in normal packet delivery.
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*
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* We also have a per-trunk rmlock(9), that is locked shared on packet
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* processing and exclusive when configuration is changed.
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*
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* The VLAN_ARRAY substitutes the dynamic hash with a static array
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* with 4096 entries. In theory this can give a boost in processing,
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* however on practice it does not. Probably this is because array
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* is too big to fit into CPU cache.
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*/
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static struct sx ifv_lock;
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#define VLAN_LOCK_INIT() sx_init(&ifv_lock, "vlan_global")
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#define VLAN_LOCK_DESTROY() sx_destroy(&ifv_lock)
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#define VLAN_LOCK_ASSERT() sx_assert(&ifv_lock, SA_LOCKED)
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#define VLAN_LOCK() sx_xlock(&ifv_lock)
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#define VLAN_UNLOCK() sx_xunlock(&ifv_lock)
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#define TRUNK_LOCK_INIT(trunk) rm_init(&(trunk)->lock, vlanname)
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#define TRUNK_LOCK_DESTROY(trunk) rm_destroy(&(trunk)->lock)
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#define TRUNK_LOCK(trunk) rm_wlock(&(trunk)->lock)
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#define TRUNK_UNLOCK(trunk) rm_wunlock(&(trunk)->lock)
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#define TRUNK_LOCK_ASSERT(trunk) rm_assert(&(trunk)->lock, RA_WLOCKED)
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#define TRUNK_RLOCK(trunk) rm_rlock(&(trunk)->lock, &tracker)
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#define TRUNK_RUNLOCK(trunk) rm_runlock(&(trunk)->lock, &tracker)
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#define TRUNK_LOCK_RASSERT(trunk) rm_assert(&(trunk)->lock, RA_RLOCKED)
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#define TRUNK_LOCK_READER struct rm_priotracker tracker
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#ifndef VLAN_ARRAY
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static void vlan_inithash(struct ifvlantrunk *trunk);
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static void vlan_freehash(struct ifvlantrunk *trunk);
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static int vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv);
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static int vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv);
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static void vlan_growhash(struct ifvlantrunk *trunk, int howmuch);
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static __inline struct ifvlan * vlan_gethash(struct ifvlantrunk *trunk,
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uint16_t vid);
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#endif
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static void trunk_destroy(struct ifvlantrunk *trunk);
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static void vlan_init(void *foo);
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static void vlan_input(struct ifnet *ifp, struct mbuf *m);
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static int vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr);
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static void vlan_qflush(struct ifnet *ifp);
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static int vlan_setflag(struct ifnet *ifp, int flag, int status,
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int (*func)(struct ifnet *, int));
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static int vlan_setflags(struct ifnet *ifp, int status);
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static int vlan_setmulti(struct ifnet *ifp);
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static int vlan_transmit(struct ifnet *ifp, struct mbuf *m);
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static void vlan_unconfig(struct ifnet *ifp);
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static void vlan_unconfig_locked(struct ifnet *ifp, int departing);
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static int vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t tag);
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static void vlan_link_state(struct ifnet *ifp);
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static void vlan_capabilities(struct ifvlan *ifv);
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static void vlan_trunk_capabilities(struct ifnet *ifp);
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static struct ifnet *vlan_clone_match_ethervid(const char *, int *);
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static int vlan_clone_match(struct if_clone *, const char *);
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static int vlan_clone_create(struct if_clone *, char *, size_t, caddr_t);
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static int vlan_clone_destroy(struct if_clone *, struct ifnet *);
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static void vlan_ifdetach(void *arg, struct ifnet *ifp);
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static void vlan_iflladdr(void *arg, struct ifnet *ifp);
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static struct if_clone *vlan_cloner;
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#ifdef VIMAGE
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static VNET_DEFINE(struct if_clone *, vlan_cloner);
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#define V_vlan_cloner VNET(vlan_cloner)
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#endif
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#ifndef VLAN_ARRAY
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#define HASH(n, m) ((((n) >> 8) ^ ((n) >> 4) ^ (n)) & (m))
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static void
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vlan_inithash(struct ifvlantrunk *trunk)
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{
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int i, n;
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/*
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* The trunk must not be locked here since we call malloc(M_WAITOK).
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* It is OK in case this function is called before the trunk struct
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* gets hooked up and becomes visible from other threads.
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*/
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KASSERT(trunk->hwidth == 0 && trunk->hash == NULL,
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("%s: hash already initialized", __func__));
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trunk->hwidth = VLAN_DEF_HWIDTH;
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n = 1 << trunk->hwidth;
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trunk->hmask = n - 1;
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trunk->hash = malloc(sizeof(struct ifvlanhead) * n, M_VLAN, M_WAITOK);
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for (i = 0; i < n; i++)
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LIST_INIT(&trunk->hash[i]);
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}
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static void
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vlan_freehash(struct ifvlantrunk *trunk)
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{
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#ifdef INVARIANTS
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int i;
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KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__));
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for (i = 0; i < (1 << trunk->hwidth); i++)
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KASSERT(LIST_EMPTY(&trunk->hash[i]),
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("%s: hash table not empty", __func__));
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#endif
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free(trunk->hash, M_VLAN);
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trunk->hash = NULL;
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trunk->hwidth = trunk->hmask = 0;
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}
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static int
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vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv)
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{
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int i, b;
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struct ifvlan *ifv2;
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TRUNK_LOCK_ASSERT(trunk);
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KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__));
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b = 1 << trunk->hwidth;
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i = HASH(ifv->ifv_vid, trunk->hmask);
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LIST_FOREACH(ifv2, &trunk->hash[i], ifv_list)
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if (ifv->ifv_vid == ifv2->ifv_vid)
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return (EEXIST);
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/*
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* Grow the hash when the number of vlans exceeds half of the number of
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* hash buckets squared. This will make the average linked-list length
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* buckets/2.
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*/
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if (trunk->refcnt > (b * b) / 2) {
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vlan_growhash(trunk, 1);
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i = HASH(ifv->ifv_vid, trunk->hmask);
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}
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LIST_INSERT_HEAD(&trunk->hash[i], ifv, ifv_list);
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trunk->refcnt++;
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return (0);
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}
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static int
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vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv)
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{
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int i, b;
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struct ifvlan *ifv2;
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TRUNK_LOCK_ASSERT(trunk);
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KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__));
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b = 1 << trunk->hwidth;
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i = HASH(ifv->ifv_vid, trunk->hmask);
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LIST_FOREACH(ifv2, &trunk->hash[i], ifv_list)
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if (ifv2 == ifv) {
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trunk->refcnt--;
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LIST_REMOVE(ifv2, ifv_list);
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if (trunk->refcnt < (b * b) / 2)
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vlan_growhash(trunk, -1);
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return (0);
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}
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panic("%s: vlan not found\n", __func__);
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return (ENOENT); /*NOTREACHED*/
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}
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/*
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* Grow the hash larger or smaller if memory permits.
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*/
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static void
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vlan_growhash(struct ifvlantrunk *trunk, int howmuch)
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{
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struct ifvlan *ifv;
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struct ifvlanhead *hash2;
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int hwidth2, i, j, n, n2;
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TRUNK_LOCK_ASSERT(trunk);
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KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__));
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if (howmuch == 0) {
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/* Harmless yet obvious coding error */
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printf("%s: howmuch is 0\n", __func__);
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return;
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}
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hwidth2 = trunk->hwidth + howmuch;
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n = 1 << trunk->hwidth;
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n2 = 1 << hwidth2;
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/* Do not shrink the table below the default */
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if (hwidth2 < VLAN_DEF_HWIDTH)
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return;
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/* M_NOWAIT because we're called with trunk mutex held */
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hash2 = malloc(sizeof(struct ifvlanhead) * n2, M_VLAN, M_NOWAIT);
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if (hash2 == NULL) {
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printf("%s: out of memory -- hash size not changed\n",
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__func__);
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return; /* We can live with the old hash table */
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}
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for (j = 0; j < n2; j++)
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LIST_INIT(&hash2[j]);
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for (i = 0; i < n; i++)
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while ((ifv = LIST_FIRST(&trunk->hash[i])) != NULL) {
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LIST_REMOVE(ifv, ifv_list);
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j = HASH(ifv->ifv_vid, n2 - 1);
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LIST_INSERT_HEAD(&hash2[j], ifv, ifv_list);
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}
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free(trunk->hash, M_VLAN);
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trunk->hash = hash2;
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trunk->hwidth = hwidth2;
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trunk->hmask = n2 - 1;
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if (bootverbose)
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if_printf(trunk->parent,
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"VLAN hash table resized from %d to %d buckets\n", n, n2);
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}
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static __inline struct ifvlan *
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vlan_gethash(struct ifvlantrunk *trunk, uint16_t vid)
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{
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struct ifvlan *ifv;
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TRUNK_LOCK_RASSERT(trunk);
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LIST_FOREACH(ifv, &trunk->hash[HASH(vid, trunk->hmask)], ifv_list)
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if (ifv->ifv_vid == vid)
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return (ifv);
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return (NULL);
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}
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#if 0
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/* Debugging code to view the hashtables. */
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static void
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vlan_dumphash(struct ifvlantrunk *trunk)
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{
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int i;
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struct ifvlan *ifv;
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for (i = 0; i < (1 << trunk->hwidth); i++) {
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printf("%d: ", i);
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LIST_FOREACH(ifv, &trunk->hash[i], ifv_list)
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printf("%s ", ifv->ifv_ifp->if_xname);
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printf("\n");
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}
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}
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#endif /* 0 */
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#else
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static __inline struct ifvlan *
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vlan_gethash(struct ifvlantrunk *trunk, uint16_t vid)
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{
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return trunk->vlans[vid];
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}
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static __inline int
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vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv)
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{
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if (trunk->vlans[ifv->ifv_vid] != NULL)
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return EEXIST;
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trunk->vlans[ifv->ifv_vid] = ifv;
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trunk->refcnt++;
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return (0);
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}
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static __inline int
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vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv)
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{
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trunk->vlans[ifv->ifv_vid] = NULL;
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trunk->refcnt--;
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return (0);
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}
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static __inline void
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vlan_freehash(struct ifvlantrunk *trunk)
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{
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}
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static __inline void
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vlan_inithash(struct ifvlantrunk *trunk)
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{
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}
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#endif /* !VLAN_ARRAY */
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static void
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trunk_destroy(struct ifvlantrunk *trunk)
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{
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VLAN_LOCK_ASSERT();
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TRUNK_LOCK(trunk);
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vlan_freehash(trunk);
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trunk->parent->if_vlantrunk = NULL;
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TRUNK_UNLOCK(trunk);
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TRUNK_LOCK_DESTROY(trunk);
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free(trunk, M_VLAN);
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}
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|
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/*
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* Program our multicast filter. What we're actually doing is
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* programming the multicast filter of the parent. This has the
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* side effect of causing the parent interface to receive multicast
|
|
* traffic that it doesn't really want, which ends up being discarded
|
|
* later by the upper protocol layers. Unfortunately, there's no way
|
|
* to avoid this: there really is only one physical interface.
|
|
*/
|
|
static int
|
|
vlan_setmulti(struct ifnet *ifp)
|
|
{
|
|
struct ifnet *ifp_p;
|
|
struct ifmultiaddr *ifma;
|
|
struct ifvlan *sc;
|
|
struct vlan_mc_entry *mc;
|
|
int error;
|
|
|
|
/* Find the parent. */
|
|
sc = ifp->if_softc;
|
|
TRUNK_LOCK_ASSERT(TRUNK(sc));
|
|
ifp_p = PARENT(sc);
|
|
|
|
CURVNET_SET_QUIET(ifp_p->if_vnet);
|
|
|
|
/* First, remove any existing filter entries. */
|
|
while ((mc = SLIST_FIRST(&sc->vlan_mc_listhead)) != NULL) {
|
|
SLIST_REMOVE_HEAD(&sc->vlan_mc_listhead, mc_entries);
|
|
(void)if_delmulti(ifp_p, (struct sockaddr *)&mc->mc_addr);
|
|
free(mc, M_VLAN);
|
|
}
|
|
|
|
/* Now program new ones. */
|
|
IF_ADDR_WLOCK(ifp);
|
|
TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
|
|
if (ifma->ifma_addr->sa_family != AF_LINK)
|
|
continue;
|
|
mc = malloc(sizeof(struct vlan_mc_entry), M_VLAN, M_NOWAIT);
|
|
if (mc == NULL) {
|
|
IF_ADDR_WUNLOCK(ifp);
|
|
return (ENOMEM);
|
|
}
|
|
bcopy(ifma->ifma_addr, &mc->mc_addr, ifma->ifma_addr->sa_len);
|
|
mc->mc_addr.sdl_index = ifp_p->if_index;
|
|
SLIST_INSERT_HEAD(&sc->vlan_mc_listhead, mc, mc_entries);
|
|
}
|
|
IF_ADDR_WUNLOCK(ifp);
|
|
SLIST_FOREACH (mc, &sc->vlan_mc_listhead, mc_entries) {
|
|
error = if_addmulti(ifp_p, (struct sockaddr *)&mc->mc_addr,
|
|
NULL);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
|
|
CURVNET_RESTORE();
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* A handler for parent interface link layer address changes.
|
|
* If the parent interface link layer address is changed we
|
|
* should also change it on all children vlans.
|
|
*/
|
|
static void
|
|
vlan_iflladdr(void *arg __unused, struct ifnet *ifp)
|
|
{
|
|
struct ifvlan *ifv;
|
|
#ifndef VLAN_ARRAY
|
|
struct ifvlan *next;
|
|
#endif
|
|
int i;
|
|
|
|
/*
|
|
* Check if it's a trunk interface first of all
|
|
* to avoid needless locking.
|
|
*/
|
|
if (ifp->if_vlantrunk == NULL)
|
|
return;
|
|
|
|
VLAN_LOCK();
|
|
/*
|
|
* OK, it's a trunk. Loop over and change all vlan's lladdrs on it.
|
|
*/
|
|
#ifdef VLAN_ARRAY
|
|
for (i = 0; i < VLAN_ARRAY_SIZE; i++)
|
|
if ((ifv = ifp->if_vlantrunk->vlans[i])) {
|
|
#else /* VLAN_ARRAY */
|
|
for (i = 0; i < (1 << ifp->if_vlantrunk->hwidth); i++)
|
|
LIST_FOREACH_SAFE(ifv, &ifp->if_vlantrunk->hash[i], ifv_list, next) {
|
|
#endif /* VLAN_ARRAY */
|
|
VLAN_UNLOCK();
|
|
if_setlladdr(ifv->ifv_ifp, IF_LLADDR(ifp),
|
|
ifp->if_addrlen);
|
|
VLAN_LOCK();
|
|
}
|
|
VLAN_UNLOCK();
|
|
|
|
}
|
|
|
|
/*
|
|
* A handler for network interface departure events.
|
|
* Track departure of trunks here so that we don't access invalid
|
|
* pointers or whatever if a trunk is ripped from under us, e.g.,
|
|
* by ejecting its hot-plug card. However, if an ifnet is simply
|
|
* being renamed, then there's no need to tear down the state.
|
|
*/
|
|
static void
|
|
vlan_ifdetach(void *arg __unused, struct ifnet *ifp)
|
|
{
|
|
struct ifvlan *ifv;
|
|
int i;
|
|
|
|
/*
|
|
* Check if it's a trunk interface first of all
|
|
* to avoid needless locking.
|
|
*/
|
|
if (ifp->if_vlantrunk == NULL)
|
|
return;
|
|
|
|
/* If the ifnet is just being renamed, don't do anything. */
|
|
if (ifp->if_flags & IFF_RENAMING)
|
|
return;
|
|
|
|
VLAN_LOCK();
|
|
/*
|
|
* OK, it's a trunk. Loop over and detach all vlan's on it.
|
|
* Check trunk pointer after each vlan_unconfig() as it will
|
|
* free it and set to NULL after the last vlan was detached.
|
|
*/
|
|
#ifdef VLAN_ARRAY
|
|
for (i = 0; i < VLAN_ARRAY_SIZE; i++)
|
|
if ((ifv = ifp->if_vlantrunk->vlans[i])) {
|
|
vlan_unconfig_locked(ifv->ifv_ifp, 1);
|
|
if (ifp->if_vlantrunk == NULL)
|
|
break;
|
|
}
|
|
#else /* VLAN_ARRAY */
|
|
restart:
|
|
for (i = 0; i < (1 << ifp->if_vlantrunk->hwidth); i++)
|
|
if ((ifv = LIST_FIRST(&ifp->if_vlantrunk->hash[i]))) {
|
|
vlan_unconfig_locked(ifv->ifv_ifp, 1);
|
|
if (ifp->if_vlantrunk)
|
|
goto restart; /* trunk->hwidth can change */
|
|
else
|
|
break;
|
|
}
|
|
#endif /* VLAN_ARRAY */
|
|
/* Trunk should have been destroyed in vlan_unconfig(). */
|
|
KASSERT(ifp->if_vlantrunk == NULL, ("%s: purge failed", __func__));
|
|
VLAN_UNLOCK();
|
|
}
|
|
|
|
/*
|
|
* Return the trunk device for a virtual interface.
|
|
*/
|
|
static struct ifnet *
|
|
vlan_trunkdev(struct ifnet *ifp)
|
|
{
|
|
struct ifvlan *ifv;
|
|
|
|
if (ifp->if_type != IFT_L2VLAN)
|
|
return (NULL);
|
|
ifv = ifp->if_softc;
|
|
ifp = NULL;
|
|
VLAN_LOCK();
|
|
if (ifv->ifv_trunk)
|
|
ifp = PARENT(ifv);
|
|
VLAN_UNLOCK();
|
|
return (ifp);
|
|
}
|
|
|
|
/*
|
|
* Return the 12-bit VLAN VID for this interface, for use by external
|
|
* components such as Infiniband.
|
|
*
|
|
* XXXRW: Note that the function name here is historical; it should be named
|
|
* vlan_vid().
|
|
*/
|
|
static int
|
|
vlan_tag(struct ifnet *ifp, uint16_t *vidp)
|
|
{
|
|
struct ifvlan *ifv;
|
|
|
|
if (ifp->if_type != IFT_L2VLAN)
|
|
return (EINVAL);
|
|
ifv = ifp->if_softc;
|
|
*vidp = ifv->ifv_vid;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Return a driver specific cookie for this interface. Synchronization
|
|
* with setcookie must be provided by the driver.
|
|
*/
|
|
static void *
|
|
vlan_cookie(struct ifnet *ifp)
|
|
{
|
|
struct ifvlan *ifv;
|
|
|
|
if (ifp->if_type != IFT_L2VLAN)
|
|
return (NULL);
|
|
ifv = ifp->if_softc;
|
|
return (ifv->ifv_cookie);
|
|
}
|
|
|
|
/*
|
|
* Store a cookie in our softc that drivers can use to store driver
|
|
* private per-instance data in.
|
|
*/
|
|
static int
|
|
vlan_setcookie(struct ifnet *ifp, void *cookie)
|
|
{
|
|
struct ifvlan *ifv;
|
|
|
|
if (ifp->if_type != IFT_L2VLAN)
|
|
return (EINVAL);
|
|
ifv = ifp->if_softc;
|
|
ifv->ifv_cookie = cookie;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Return the vlan device present at the specific VID.
|
|
*/
|
|
static struct ifnet *
|
|
vlan_devat(struct ifnet *ifp, uint16_t vid)
|
|
{
|
|
struct ifvlantrunk *trunk;
|
|
struct ifvlan *ifv;
|
|
TRUNK_LOCK_READER;
|
|
|
|
trunk = ifp->if_vlantrunk;
|
|
if (trunk == NULL)
|
|
return (NULL);
|
|
ifp = NULL;
|
|
TRUNK_RLOCK(trunk);
|
|
ifv = vlan_gethash(trunk, vid);
|
|
if (ifv)
|
|
ifp = ifv->ifv_ifp;
|
|
TRUNK_RUNLOCK(trunk);
|
|
return (ifp);
|
|
}
|
|
|
|
/*
|
|
* VLAN support can be loaded as a module. The only place in the
|
|
* system that's intimately aware of this is ether_input. We hook
|
|
* into this code through vlan_input_p which is defined there and
|
|
* set here. Noone else in the system should be aware of this so
|
|
* we use an explicit reference here.
|
|
*/
|
|
extern void (*vlan_input_p)(struct ifnet *, struct mbuf *);
|
|
|
|
/* For if_link_state_change() eyes only... */
|
|
extern void (*vlan_link_state_p)(struct ifnet *);
|
|
|
|
static int
|
|
vlan_modevent(module_t mod, int type, void *data)
|
|
{
|
|
|
|
switch (type) {
|
|
case MOD_LOAD:
|
|
ifdetach_tag = EVENTHANDLER_REGISTER(ifnet_departure_event,
|
|
vlan_ifdetach, NULL, EVENTHANDLER_PRI_ANY);
|
|
if (ifdetach_tag == NULL)
|
|
return (ENOMEM);
|
|
iflladdr_tag = EVENTHANDLER_REGISTER(iflladdr_event,
|
|
vlan_iflladdr, NULL, EVENTHANDLER_PRI_ANY);
|
|
if (iflladdr_tag == NULL)
|
|
return (ENOMEM);
|
|
VLAN_LOCK_INIT();
|
|
vlan_input_p = vlan_input;
|
|
vlan_link_state_p = vlan_link_state;
|
|
vlan_trunk_cap_p = vlan_trunk_capabilities;
|
|
vlan_trunkdev_p = vlan_trunkdev;
|
|
vlan_cookie_p = vlan_cookie;
|
|
vlan_setcookie_p = vlan_setcookie;
|
|
vlan_tag_p = vlan_tag;
|
|
vlan_devat_p = vlan_devat;
|
|
#ifndef VIMAGE
|
|
vlan_cloner = if_clone_advanced(vlanname, 0, vlan_clone_match,
|
|
vlan_clone_create, vlan_clone_destroy);
|
|
#endif
|
|
if (bootverbose)
|
|
printf("vlan: initialized, using "
|
|
#ifdef VLAN_ARRAY
|
|
"full-size arrays"
|
|
#else
|
|
"hash tables with chaining"
|
|
#endif
|
|
|
|
"\n");
|
|
break;
|
|
case MOD_UNLOAD:
|
|
#ifndef VIMAGE
|
|
if_clone_detach(vlan_cloner);
|
|
#endif
|
|
EVENTHANDLER_DEREGISTER(ifnet_departure_event, ifdetach_tag);
|
|
EVENTHANDLER_DEREGISTER(iflladdr_event, iflladdr_tag);
|
|
vlan_input_p = NULL;
|
|
vlan_link_state_p = NULL;
|
|
vlan_trunk_cap_p = NULL;
|
|
vlan_trunkdev_p = NULL;
|
|
vlan_tag_p = NULL;
|
|
vlan_cookie_p = NULL;
|
|
vlan_setcookie_p = NULL;
|
|
vlan_devat_p = NULL;
|
|
VLAN_LOCK_DESTROY();
|
|
if (bootverbose)
|
|
printf("vlan: unloaded\n");
|
|
break;
|
|
default:
|
|
return (EOPNOTSUPP);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static moduledata_t vlan_mod = {
|
|
"if_vlan",
|
|
vlan_modevent,
|
|
0
|
|
};
|
|
|
|
DECLARE_MODULE(if_vlan, vlan_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
|
|
MODULE_VERSION(if_vlan, 3);
|
|
|
|
#ifdef VIMAGE
|
|
static void
|
|
vnet_vlan_init(const void *unused __unused)
|
|
{
|
|
|
|
vlan_cloner = if_clone_advanced(vlanname, 0, vlan_clone_match,
|
|
vlan_clone_create, vlan_clone_destroy);
|
|
V_vlan_cloner = vlan_cloner;
|
|
}
|
|
VNET_SYSINIT(vnet_vlan_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
|
|
vnet_vlan_init, NULL);
|
|
|
|
static void
|
|
vnet_vlan_uninit(const void *unused __unused)
|
|
{
|
|
|
|
if_clone_detach(V_vlan_cloner);
|
|
}
|
|
VNET_SYSUNINIT(vnet_vlan_uninit, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_FIRST,
|
|
vnet_vlan_uninit, NULL);
|
|
#endif
|
|
|
|
/*
|
|
* Check for <etherif>.<vlan> style interface names.
|
|
*/
|
|
static struct ifnet *
|
|
vlan_clone_match_ethervid(const char *name, int *vidp)
|
|
{
|
|
char ifname[IFNAMSIZ];
|
|
char *cp;
|
|
struct ifnet *ifp;
|
|
int vid;
|
|
|
|
strlcpy(ifname, name, IFNAMSIZ);
|
|
if ((cp = strchr(ifname, '.')) == NULL)
|
|
return (NULL);
|
|
*cp = '\0';
|
|
if ((ifp = ifunit(ifname)) == NULL)
|
|
return (NULL);
|
|
/* Parse VID. */
|
|
if (*++cp == '\0')
|
|
return (NULL);
|
|
vid = 0;
|
|
for(; *cp >= '0' && *cp <= '9'; cp++)
|
|
vid = (vid * 10) + (*cp - '0');
|
|
if (*cp != '\0')
|
|
return (NULL);
|
|
if (vidp != NULL)
|
|
*vidp = vid;
|
|
|
|
return (ifp);
|
|
}
|
|
|
|
static int
|
|
vlan_clone_match(struct if_clone *ifc, const char *name)
|
|
{
|
|
const char *cp;
|
|
|
|
if (vlan_clone_match_ethervid(name, NULL) != NULL)
|
|
return (1);
|
|
|
|
if (strncmp(vlanname, name, strlen(vlanname)) != 0)
|
|
return (0);
|
|
for (cp = name + 4; *cp != '\0'; cp++) {
|
|
if (*cp < '0' || *cp > '9')
|
|
return (0);
|
|
}
|
|
|
|
return (1);
|
|
}
|
|
|
|
static int
|
|
vlan_clone_create(struct if_clone *ifc, char *name, size_t len, caddr_t params)
|
|
{
|
|
char *dp;
|
|
int wildcard;
|
|
int unit;
|
|
int error;
|
|
int vid;
|
|
int ethertag;
|
|
struct ifvlan *ifv;
|
|
struct ifnet *ifp;
|
|
struct ifnet *p;
|
|
struct ifaddr *ifa;
|
|
struct sockaddr_dl *sdl;
|
|
struct vlanreq vlr;
|
|
static const u_char eaddr[ETHER_ADDR_LEN]; /* 00:00:00:00:00:00 */
|
|
|
|
/*
|
|
* There are 3 (ugh) ways to specify the cloned device:
|
|
* o pass a parameter block with the clone request.
|
|
* o specify parameters in the text of the clone device name
|
|
* o specify no parameters and get an unattached device that
|
|
* must be configured separately.
|
|
* The first technique is preferred; the latter two are
|
|
* supported for backwards compatibilty.
|
|
*
|
|
* XXXRW: Note historic use of the word "tag" here. New ioctls may be
|
|
* called for.
|
|
*/
|
|
if (params) {
|
|
error = copyin(params, &vlr, sizeof(vlr));
|
|
if (error)
|
|
return error;
|
|
p = ifunit(vlr.vlr_parent);
|
|
if (p == NULL)
|
|
return (ENXIO);
|
|
error = ifc_name2unit(name, &unit);
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
ethertag = 1;
|
|
vid = vlr.vlr_tag;
|
|
wildcard = (unit < 0);
|
|
} else if ((p = vlan_clone_match_ethervid(name, &vid)) != NULL) {
|
|
ethertag = 1;
|
|
unit = -1;
|
|
wildcard = 0;
|
|
} else {
|
|
ethertag = 0;
|
|
|
|
error = ifc_name2unit(name, &unit);
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
wildcard = (unit < 0);
|
|
}
|
|
|
|
error = ifc_alloc_unit(ifc, &unit);
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
/* In the wildcard case, we need to update the name. */
|
|
if (wildcard) {
|
|
for (dp = name; *dp != '\0'; dp++);
|
|
if (snprintf(dp, len - (dp-name), "%d", unit) >
|
|
len - (dp-name) - 1) {
|
|
panic("%s: interface name too long", __func__);
|
|
}
|
|
}
|
|
|
|
ifv = malloc(sizeof(struct ifvlan), M_VLAN, M_WAITOK | M_ZERO);
|
|
ifp = ifv->ifv_ifp = if_alloc(IFT_ETHER);
|
|
if (ifp == NULL) {
|
|
ifc_free_unit(ifc, unit);
|
|
free(ifv, M_VLAN);
|
|
return (ENOSPC);
|
|
}
|
|
SLIST_INIT(&ifv->vlan_mc_listhead);
|
|
ifp->if_softc = ifv;
|
|
/*
|
|
* Set the name manually rather than using if_initname because
|
|
* we don't conform to the default naming convention for interfaces.
|
|
*/
|
|
strlcpy(ifp->if_xname, name, IFNAMSIZ);
|
|
ifp->if_dname = vlanname;
|
|
ifp->if_dunit = unit;
|
|
/* NB: flags are not set here */
|
|
ifp->if_linkmib = &ifv->ifv_mib;
|
|
ifp->if_linkmiblen = sizeof(ifv->ifv_mib);
|
|
/* NB: mtu is not set here */
|
|
|
|
ifp->if_init = vlan_init;
|
|
ifp->if_transmit = vlan_transmit;
|
|
ifp->if_qflush = vlan_qflush;
|
|
ifp->if_ioctl = vlan_ioctl;
|
|
ifp->if_flags = VLAN_IFFLAGS;
|
|
ether_ifattach(ifp, eaddr);
|
|
/* Now undo some of the damage... */
|
|
ifp->if_baudrate = 0;
|
|
ifp->if_type = IFT_L2VLAN;
|
|
ifp->if_hdrlen = ETHER_VLAN_ENCAP_LEN;
|
|
ifa = ifp->if_addr;
|
|
sdl = (struct sockaddr_dl *)ifa->ifa_addr;
|
|
sdl->sdl_type = IFT_L2VLAN;
|
|
|
|
if (ethertag) {
|
|
error = vlan_config(ifv, p, vid);
|
|
if (error != 0) {
|
|
/*
|
|
* Since we've partially failed, we need to back
|
|
* out all the way, otherwise userland could get
|
|
* confused. Thus, we destroy the interface.
|
|
*/
|
|
ether_ifdetach(ifp);
|
|
vlan_unconfig(ifp);
|
|
if_free(ifp);
|
|
ifc_free_unit(ifc, unit);
|
|
free(ifv, M_VLAN);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/* Update flags on the parent, if necessary. */
|
|
vlan_setflags(ifp, 1);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
vlan_clone_destroy(struct if_clone *ifc, struct ifnet *ifp)
|
|
{
|
|
struct ifvlan *ifv = ifp->if_softc;
|
|
int unit = ifp->if_dunit;
|
|
|
|
ether_ifdetach(ifp); /* first, remove it from system-wide lists */
|
|
vlan_unconfig(ifp); /* now it can be unconfigured and freed */
|
|
if_free(ifp);
|
|
free(ifv, M_VLAN);
|
|
ifc_free_unit(ifc, unit);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* The ifp->if_init entry point for vlan(4) is a no-op.
|
|
*/
|
|
static void
|
|
vlan_init(void *foo __unused)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* The if_transmit method for vlan(4) interface.
|
|
*/
|
|
static int
|
|
vlan_transmit(struct ifnet *ifp, struct mbuf *m)
|
|
{
|
|
struct ifvlan *ifv;
|
|
struct ifnet *p;
|
|
int error, len, mcast;
|
|
|
|
ifv = ifp->if_softc;
|
|
p = PARENT(ifv);
|
|
len = m->m_pkthdr.len;
|
|
mcast = (m->m_flags & (M_MCAST | M_BCAST)) ? 1 : 0;
|
|
|
|
BPF_MTAP(ifp, m);
|
|
|
|
/*
|
|
* Do not run parent's if_transmit() if the parent is not up,
|
|
* or parent's driver will cause a system crash.
|
|
*/
|
|
if (!UP_AND_RUNNING(p)) {
|
|
m_freem(m);
|
|
if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
|
|
return (ENETDOWN);
|
|
}
|
|
|
|
/*
|
|
* Pad the frame to the minimum size allowed if told to.
|
|
* This option is in accord with IEEE Std 802.1Q, 2003 Ed.,
|
|
* paragraph C.4.4.3.b. It can help to work around buggy
|
|
* bridges that violate paragraph C.4.4.3.a from the same
|
|
* document, i.e., fail to pad short frames after untagging.
|
|
* E.g., a tagged frame 66 bytes long (incl. FCS) is OK, but
|
|
* untagging it will produce a 62-byte frame, which is a runt
|
|
* and requires padding. There are VLAN-enabled network
|
|
* devices that just discard such runts instead or mishandle
|
|
* them somehow.
|
|
*/
|
|
if (V_soft_pad && p->if_type == IFT_ETHER) {
|
|
static char pad[8]; /* just zeros */
|
|
int n;
|
|
|
|
for (n = ETHERMIN + ETHER_HDR_LEN - m->m_pkthdr.len;
|
|
n > 0; n -= sizeof(pad))
|
|
if (!m_append(m, min(n, sizeof(pad)), pad))
|
|
break;
|
|
|
|
if (n > 0) {
|
|
if_printf(ifp, "cannot pad short frame\n");
|
|
if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
|
|
m_freem(m);
|
|
return (0);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If underlying interface can do VLAN tag insertion itself,
|
|
* just pass the packet along. However, we need some way to
|
|
* tell the interface where the packet came from so that it
|
|
* knows how to find the VLAN tag to use, so we attach a
|
|
* packet tag that holds it.
|
|
*/
|
|
if (p->if_capenable & IFCAP_VLAN_HWTAGGING) {
|
|
m->m_pkthdr.ether_vtag = ifv->ifv_vid;
|
|
m->m_flags |= M_VLANTAG;
|
|
} else {
|
|
m = ether_vlanencap(m, ifv->ifv_vid);
|
|
if (m == NULL) {
|
|
if_printf(ifp, "unable to prepend VLAN header\n");
|
|
if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
|
|
return (0);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Send it, precisely as ether_output() would have.
|
|
*/
|
|
error = (p->if_transmit)(p, m);
|
|
if (error == 0) {
|
|
if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
|
|
if_inc_counter(ifp, IFCOUNTER_OBYTES, len);
|
|
if_inc_counter(ifp, IFCOUNTER_OMCASTS, mcast);
|
|
} else
|
|
if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* The ifp->if_qflush entry point for vlan(4) is a no-op.
|
|
*/
|
|
static void
|
|
vlan_qflush(struct ifnet *ifp __unused)
|
|
{
|
|
}
|
|
|
|
static void
|
|
vlan_input(struct ifnet *ifp, struct mbuf *m)
|
|
{
|
|
struct ifvlantrunk *trunk = ifp->if_vlantrunk;
|
|
struct ifvlan *ifv;
|
|
TRUNK_LOCK_READER;
|
|
uint16_t vid;
|
|
|
|
KASSERT(trunk != NULL, ("%s: no trunk", __func__));
|
|
|
|
if (m->m_flags & M_VLANTAG) {
|
|
/*
|
|
* Packet is tagged, but m contains a normal
|
|
* Ethernet frame; the tag is stored out-of-band.
|
|
*/
|
|
vid = EVL_VLANOFTAG(m->m_pkthdr.ether_vtag);
|
|
m->m_flags &= ~M_VLANTAG;
|
|
} else {
|
|
struct ether_vlan_header *evl;
|
|
|
|
/*
|
|
* Packet is tagged in-band as specified by 802.1q.
|
|
*/
|
|
switch (ifp->if_type) {
|
|
case IFT_ETHER:
|
|
if (m->m_len < sizeof(*evl) &&
|
|
(m = m_pullup(m, sizeof(*evl))) == NULL) {
|
|
if_printf(ifp, "cannot pullup VLAN header\n");
|
|
return;
|
|
}
|
|
evl = mtod(m, struct ether_vlan_header *);
|
|
vid = EVL_VLANOFTAG(ntohs(evl->evl_tag));
|
|
|
|
/*
|
|
* Remove the 802.1q header by copying the Ethernet
|
|
* addresses over it and adjusting the beginning of
|
|
* the data in the mbuf. The encapsulated Ethernet
|
|
* type field is already in place.
|
|
*/
|
|
bcopy((char *)evl, (char *)evl + ETHER_VLAN_ENCAP_LEN,
|
|
ETHER_HDR_LEN - ETHER_TYPE_LEN);
|
|
m_adj(m, ETHER_VLAN_ENCAP_LEN);
|
|
break;
|
|
|
|
default:
|
|
#ifdef INVARIANTS
|
|
panic("%s: %s has unsupported if_type %u",
|
|
__func__, ifp->if_xname, ifp->if_type);
|
|
#endif
|
|
m_freem(m);
|
|
if_inc_counter(ifp, IFCOUNTER_NOPROTO, 1);
|
|
return;
|
|
}
|
|
}
|
|
|
|
TRUNK_RLOCK(trunk);
|
|
ifv = vlan_gethash(trunk, vid);
|
|
if (ifv == NULL || !UP_AND_RUNNING(ifv->ifv_ifp)) {
|
|
TRUNK_RUNLOCK(trunk);
|
|
m_freem(m);
|
|
if_inc_counter(ifp, IFCOUNTER_NOPROTO, 1);
|
|
return;
|
|
}
|
|
TRUNK_RUNLOCK(trunk);
|
|
|
|
m->m_pkthdr.rcvif = ifv->ifv_ifp;
|
|
if_inc_counter(ifv->ifv_ifp, IFCOUNTER_IPACKETS, 1);
|
|
|
|
/* Pass it back through the parent's input routine. */
|
|
(*ifp->if_input)(ifv->ifv_ifp, m);
|
|
}
|
|
|
|
static int
|
|
vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t vid)
|
|
{
|
|
struct ifvlantrunk *trunk;
|
|
struct ifnet *ifp;
|
|
int error = 0;
|
|
|
|
/*
|
|
* We can handle non-ethernet hardware types as long as
|
|
* they handle the tagging and headers themselves.
|
|
*/
|
|
if (p->if_type != IFT_ETHER &&
|
|
(p->if_capenable & IFCAP_VLAN_HWTAGGING) == 0)
|
|
return (EPROTONOSUPPORT);
|
|
if ((p->if_flags & VLAN_IFFLAGS) != VLAN_IFFLAGS)
|
|
return (EPROTONOSUPPORT);
|
|
/*
|
|
* Don't let the caller set up a VLAN VID with
|
|
* anything except VLID bits.
|
|
* VID numbers 0x0 and 0xFFF are reserved.
|
|
*/
|
|
if (vid == 0 || vid == 0xFFF || (vid & ~EVL_VLID_MASK))
|
|
return (EINVAL);
|
|
if (ifv->ifv_trunk)
|
|
return (EBUSY);
|
|
|
|
if (p->if_vlantrunk == NULL) {
|
|
trunk = malloc(sizeof(struct ifvlantrunk),
|
|
M_VLAN, M_WAITOK | M_ZERO);
|
|
vlan_inithash(trunk);
|
|
VLAN_LOCK();
|
|
if (p->if_vlantrunk != NULL) {
|
|
/* A race that that is very unlikely to be hit. */
|
|
vlan_freehash(trunk);
|
|
free(trunk, M_VLAN);
|
|
goto exists;
|
|
}
|
|
TRUNK_LOCK_INIT(trunk);
|
|
TRUNK_LOCK(trunk);
|
|
p->if_vlantrunk = trunk;
|
|
trunk->parent = p;
|
|
} else {
|
|
VLAN_LOCK();
|
|
exists:
|
|
trunk = p->if_vlantrunk;
|
|
TRUNK_LOCK(trunk);
|
|
}
|
|
|
|
ifv->ifv_vid = vid; /* must set this before vlan_inshash() */
|
|
error = vlan_inshash(trunk, ifv);
|
|
if (error)
|
|
goto done;
|
|
ifv->ifv_proto = ETHERTYPE_VLAN;
|
|
ifv->ifv_encaplen = ETHER_VLAN_ENCAP_LEN;
|
|
ifv->ifv_mintu = ETHERMIN;
|
|
ifv->ifv_pflags = 0;
|
|
|
|
/*
|
|
* If the parent supports the VLAN_MTU capability,
|
|
* i.e. can Tx/Rx larger than ETHER_MAX_LEN frames,
|
|
* use it.
|
|
*/
|
|
if (p->if_capenable & IFCAP_VLAN_MTU) {
|
|
/*
|
|
* No need to fudge the MTU since the parent can
|
|
* handle extended frames.
|
|
*/
|
|
ifv->ifv_mtufudge = 0;
|
|
} else {
|
|
/*
|
|
* Fudge the MTU by the encapsulation size. This
|
|
* makes us incompatible with strictly compliant
|
|
* 802.1Q implementations, but allows us to use
|
|
* the feature with other NetBSD implementations,
|
|
* which might still be useful.
|
|
*/
|
|
ifv->ifv_mtufudge = ifv->ifv_encaplen;
|
|
}
|
|
|
|
ifv->ifv_trunk = trunk;
|
|
ifp = ifv->ifv_ifp;
|
|
/*
|
|
* Initialize fields from our parent. This duplicates some
|
|
* work with ether_ifattach() but allows for non-ethernet
|
|
* interfaces to also work.
|
|
*/
|
|
ifp->if_mtu = p->if_mtu - ifv->ifv_mtufudge;
|
|
ifp->if_baudrate = p->if_baudrate;
|
|
ifp->if_output = p->if_output;
|
|
ifp->if_input = p->if_input;
|
|
ifp->if_resolvemulti = p->if_resolvemulti;
|
|
ifp->if_addrlen = p->if_addrlen;
|
|
ifp->if_broadcastaddr = p->if_broadcastaddr;
|
|
|
|
/*
|
|
* Copy only a selected subset of flags from the parent.
|
|
* Other flags are none of our business.
|
|
*/
|
|
#define VLAN_COPY_FLAGS (IFF_SIMPLEX)
|
|
ifp->if_flags &= ~VLAN_COPY_FLAGS;
|
|
ifp->if_flags |= p->if_flags & VLAN_COPY_FLAGS;
|
|
#undef VLAN_COPY_FLAGS
|
|
|
|
ifp->if_link_state = p->if_link_state;
|
|
|
|
vlan_capabilities(ifv);
|
|
|
|
/*
|
|
* Set up our interface address to reflect the underlying
|
|
* physical interface's.
|
|
*/
|
|
bcopy(IF_LLADDR(p), IF_LLADDR(ifp), p->if_addrlen);
|
|
((struct sockaddr_dl *)ifp->if_addr->ifa_addr)->sdl_alen =
|
|
p->if_addrlen;
|
|
|
|
/*
|
|
* Configure multicast addresses that may already be
|
|
* joined on the vlan device.
|
|
*/
|
|
(void)vlan_setmulti(ifp); /* XXX: VLAN lock held */
|
|
|
|
/* We are ready for operation now. */
|
|
ifp->if_drv_flags |= IFF_DRV_RUNNING;
|
|
done:
|
|
TRUNK_UNLOCK(trunk);
|
|
if (error == 0)
|
|
EVENTHANDLER_INVOKE(vlan_config, p, ifv->ifv_vid);
|
|
VLAN_UNLOCK();
|
|
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
vlan_unconfig(struct ifnet *ifp)
|
|
{
|
|
|
|
VLAN_LOCK();
|
|
vlan_unconfig_locked(ifp, 0);
|
|
VLAN_UNLOCK();
|
|
}
|
|
|
|
static void
|
|
vlan_unconfig_locked(struct ifnet *ifp, int departing)
|
|
{
|
|
struct ifvlantrunk *trunk;
|
|
struct vlan_mc_entry *mc;
|
|
struct ifvlan *ifv;
|
|
struct ifnet *parent;
|
|
int error;
|
|
|
|
VLAN_LOCK_ASSERT();
|
|
|
|
ifv = ifp->if_softc;
|
|
trunk = ifv->ifv_trunk;
|
|
parent = NULL;
|
|
|
|
if (trunk != NULL) {
|
|
|
|
TRUNK_LOCK(trunk);
|
|
parent = trunk->parent;
|
|
|
|
/*
|
|
* Since the interface is being unconfigured, we need to
|
|
* empty the list of multicast groups that we may have joined
|
|
* while we were alive from the parent's list.
|
|
*/
|
|
while ((mc = SLIST_FIRST(&ifv->vlan_mc_listhead)) != NULL) {
|
|
/*
|
|
* If the parent interface is being detached,
|
|
* all its multicast addresses have already
|
|
* been removed. Warn about errors if
|
|
* if_delmulti() does fail, but don't abort as
|
|
* all callers expect vlan destruction to
|
|
* succeed.
|
|
*/
|
|
if (!departing) {
|
|
error = if_delmulti(parent,
|
|
(struct sockaddr *)&mc->mc_addr);
|
|
if (error)
|
|
if_printf(ifp,
|
|
"Failed to delete multicast address from parent: %d\n",
|
|
error);
|
|
}
|
|
SLIST_REMOVE_HEAD(&ifv->vlan_mc_listhead, mc_entries);
|
|
free(mc, M_VLAN);
|
|
}
|
|
|
|
vlan_setflags(ifp, 0); /* clear special flags on parent */
|
|
vlan_remhash(trunk, ifv);
|
|
ifv->ifv_trunk = NULL;
|
|
|
|
/*
|
|
* Check if we were the last.
|
|
*/
|
|
if (trunk->refcnt == 0) {
|
|
parent->if_vlantrunk = NULL;
|
|
/*
|
|
* XXXGL: If some ithread has already entered
|
|
* vlan_input() and is now blocked on the trunk
|
|
* lock, then it should preempt us right after
|
|
* unlock and finish its work. Then we will acquire
|
|
* lock again in trunk_destroy().
|
|
*/
|
|
TRUNK_UNLOCK(trunk);
|
|
trunk_destroy(trunk);
|
|
} else
|
|
TRUNK_UNLOCK(trunk);
|
|
}
|
|
|
|
/* Disconnect from parent. */
|
|
if (ifv->ifv_pflags)
|
|
if_printf(ifp, "%s: ifv_pflags unclean\n", __func__);
|
|
ifp->if_mtu = ETHERMTU;
|
|
ifp->if_link_state = LINK_STATE_UNKNOWN;
|
|
ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
|
|
|
|
/*
|
|
* Only dispatch an event if vlan was
|
|
* attached, otherwise there is nothing
|
|
* to cleanup anyway.
|
|
*/
|
|
if (parent != NULL)
|
|
EVENTHANDLER_INVOKE(vlan_unconfig, parent, ifv->ifv_vid);
|
|
}
|
|
|
|
/* Handle a reference counted flag that should be set on the parent as well */
|
|
static int
|
|
vlan_setflag(struct ifnet *ifp, int flag, int status,
|
|
int (*func)(struct ifnet *, int))
|
|
{
|
|
struct ifvlan *ifv;
|
|
int error;
|
|
|
|
/* XXX VLAN_LOCK_ASSERT(); */
|
|
|
|
ifv = ifp->if_softc;
|
|
status = status ? (ifp->if_flags & flag) : 0;
|
|
/* Now "status" contains the flag value or 0 */
|
|
|
|
/*
|
|
* See if recorded parent's status is different from what
|
|
* we want it to be. If it is, flip it. We record parent's
|
|
* status in ifv_pflags so that we won't clear parent's flag
|
|
* we haven't set. In fact, we don't clear or set parent's
|
|
* flags directly, but get or release references to them.
|
|
* That's why we can be sure that recorded flags still are
|
|
* in accord with actual parent's flags.
|
|
*/
|
|
if (status != (ifv->ifv_pflags & flag)) {
|
|
error = (*func)(PARENT(ifv), status);
|
|
if (error)
|
|
return (error);
|
|
ifv->ifv_pflags &= ~flag;
|
|
ifv->ifv_pflags |= status;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Handle IFF_* flags that require certain changes on the parent:
|
|
* if "status" is true, update parent's flags respective to our if_flags;
|
|
* if "status" is false, forcedly clear the flags set on parent.
|
|
*/
|
|
static int
|
|
vlan_setflags(struct ifnet *ifp, int status)
|
|
{
|
|
int error, i;
|
|
|
|
for (i = 0; vlan_pflags[i].flag; i++) {
|
|
error = vlan_setflag(ifp, vlan_pflags[i].flag,
|
|
status, vlan_pflags[i].func);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/* Inform all vlans that their parent has changed link state */
|
|
static void
|
|
vlan_link_state(struct ifnet *ifp)
|
|
{
|
|
struct ifvlantrunk *trunk = ifp->if_vlantrunk;
|
|
struct ifvlan *ifv;
|
|
int i;
|
|
|
|
TRUNK_LOCK(trunk);
|
|
#ifdef VLAN_ARRAY
|
|
for (i = 0; i < VLAN_ARRAY_SIZE; i++)
|
|
if (trunk->vlans[i] != NULL) {
|
|
ifv = trunk->vlans[i];
|
|
#else
|
|
for (i = 0; i < (1 << trunk->hwidth); i++)
|
|
LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) {
|
|
#endif
|
|
ifv->ifv_ifp->if_baudrate = trunk->parent->if_baudrate;
|
|
if_link_state_change(ifv->ifv_ifp,
|
|
trunk->parent->if_link_state);
|
|
}
|
|
TRUNK_UNLOCK(trunk);
|
|
}
|
|
|
|
static void
|
|
vlan_capabilities(struct ifvlan *ifv)
|
|
{
|
|
struct ifnet *p = PARENT(ifv);
|
|
struct ifnet *ifp = ifv->ifv_ifp;
|
|
struct ifnet_hw_tsomax hw_tsomax;
|
|
|
|
TRUNK_LOCK_ASSERT(TRUNK(ifv));
|
|
|
|
/*
|
|
* If the parent interface can do checksum offloading
|
|
* on VLANs, then propagate its hardware-assisted
|
|
* checksumming flags. Also assert that checksum
|
|
* offloading requires hardware VLAN tagging.
|
|
*/
|
|
if (p->if_capabilities & IFCAP_VLAN_HWCSUM)
|
|
ifp->if_capabilities = p->if_capabilities & IFCAP_HWCSUM;
|
|
|
|
if (p->if_capenable & IFCAP_VLAN_HWCSUM &&
|
|
p->if_capenable & IFCAP_VLAN_HWTAGGING) {
|
|
ifp->if_capenable = p->if_capenable & IFCAP_HWCSUM;
|
|
ifp->if_hwassist = p->if_hwassist & (CSUM_IP | CSUM_TCP |
|
|
CSUM_UDP | CSUM_SCTP);
|
|
} else {
|
|
ifp->if_capenable = 0;
|
|
ifp->if_hwassist = 0;
|
|
}
|
|
/*
|
|
* If the parent interface can do TSO on VLANs then
|
|
* propagate the hardware-assisted flag. TSO on VLANs
|
|
* does not necessarily require hardware VLAN tagging.
|
|
*/
|
|
memset(&hw_tsomax, 0, sizeof(hw_tsomax));
|
|
if_hw_tsomax_common(p, &hw_tsomax);
|
|
if_hw_tsomax_update(ifp, &hw_tsomax);
|
|
if (p->if_capabilities & IFCAP_VLAN_HWTSO)
|
|
ifp->if_capabilities |= p->if_capabilities & IFCAP_TSO;
|
|
if (p->if_capenable & IFCAP_VLAN_HWTSO) {
|
|
ifp->if_capenable |= p->if_capenable & IFCAP_TSO;
|
|
ifp->if_hwassist |= p->if_hwassist & CSUM_TSO;
|
|
} else {
|
|
ifp->if_capenable &= ~(p->if_capenable & IFCAP_TSO);
|
|
ifp->if_hwassist &= ~(p->if_hwassist & CSUM_TSO);
|
|
}
|
|
|
|
/*
|
|
* If the parent interface can offload TCP connections over VLANs then
|
|
* propagate its TOE capability to the VLAN interface.
|
|
*
|
|
* All TOE drivers in the tree today can deal with VLANs. If this
|
|
* changes then IFCAP_VLAN_TOE should be promoted to a full capability
|
|
* with its own bit.
|
|
*/
|
|
#define IFCAP_VLAN_TOE IFCAP_TOE
|
|
if (p->if_capabilities & IFCAP_VLAN_TOE)
|
|
ifp->if_capabilities |= p->if_capabilities & IFCAP_TOE;
|
|
if (p->if_capenable & IFCAP_VLAN_TOE) {
|
|
TOEDEV(ifp) = TOEDEV(p);
|
|
ifp->if_capenable |= p->if_capenable & IFCAP_TOE;
|
|
}
|
|
}
|
|
|
|
static void
|
|
vlan_trunk_capabilities(struct ifnet *ifp)
|
|
{
|
|
struct ifvlantrunk *trunk = ifp->if_vlantrunk;
|
|
struct ifvlan *ifv;
|
|
int i;
|
|
|
|
TRUNK_LOCK(trunk);
|
|
#ifdef VLAN_ARRAY
|
|
for (i = 0; i < VLAN_ARRAY_SIZE; i++)
|
|
if (trunk->vlans[i] != NULL) {
|
|
ifv = trunk->vlans[i];
|
|
#else
|
|
for (i = 0; i < (1 << trunk->hwidth); i++) {
|
|
LIST_FOREACH(ifv, &trunk->hash[i], ifv_list)
|
|
#endif
|
|
vlan_capabilities(ifv);
|
|
}
|
|
TRUNK_UNLOCK(trunk);
|
|
}
|
|
|
|
static int
|
|
vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
|
|
{
|
|
struct ifnet *p;
|
|
struct ifreq *ifr;
|
|
struct ifaddr *ifa;
|
|
struct ifvlan *ifv;
|
|
struct ifvlantrunk *trunk;
|
|
struct vlanreq vlr;
|
|
int error = 0;
|
|
|
|
ifr = (struct ifreq *)data;
|
|
ifa = (struct ifaddr *) data;
|
|
ifv = ifp->if_softc;
|
|
|
|
switch (cmd) {
|
|
case SIOCSIFADDR:
|
|
ifp->if_flags |= IFF_UP;
|
|
#ifdef INET
|
|
if (ifa->ifa_addr->sa_family == AF_INET)
|
|
arp_ifinit(ifp, ifa);
|
|
#endif
|
|
break;
|
|
case SIOCGIFADDR:
|
|
{
|
|
struct sockaddr *sa;
|
|
|
|
sa = (struct sockaddr *)&ifr->ifr_data;
|
|
bcopy(IF_LLADDR(ifp), sa->sa_data, ifp->if_addrlen);
|
|
}
|
|
break;
|
|
case SIOCGIFMEDIA:
|
|
VLAN_LOCK();
|
|
if (TRUNK(ifv) != NULL) {
|
|
p = PARENT(ifv);
|
|
VLAN_UNLOCK();
|
|
error = (*p->if_ioctl)(p, SIOCGIFMEDIA, data);
|
|
/* Limit the result to the parent's current config. */
|
|
if (error == 0) {
|
|
struct ifmediareq *ifmr;
|
|
|
|
ifmr = (struct ifmediareq *)data;
|
|
if (ifmr->ifm_count >= 1 && ifmr->ifm_ulist) {
|
|
ifmr->ifm_count = 1;
|
|
error = copyout(&ifmr->ifm_current,
|
|
ifmr->ifm_ulist,
|
|
sizeof(int));
|
|
}
|
|
}
|
|
} else {
|
|
VLAN_UNLOCK();
|
|
error = EINVAL;
|
|
}
|
|
break;
|
|
|
|
case SIOCSIFMEDIA:
|
|
error = EINVAL;
|
|
break;
|
|
|
|
case SIOCSIFMTU:
|
|
/*
|
|
* Set the interface MTU.
|
|
*/
|
|
VLAN_LOCK();
|
|
if (TRUNK(ifv) != NULL) {
|
|
if (ifr->ifr_mtu >
|
|
(PARENT(ifv)->if_mtu - ifv->ifv_mtufudge) ||
|
|
ifr->ifr_mtu <
|
|
(ifv->ifv_mintu - ifv->ifv_mtufudge))
|
|
error = EINVAL;
|
|
else
|
|
ifp->if_mtu = ifr->ifr_mtu;
|
|
} else
|
|
error = EINVAL;
|
|
VLAN_UNLOCK();
|
|
break;
|
|
|
|
case SIOCSETVLAN:
|
|
#ifdef VIMAGE
|
|
/*
|
|
* XXXRW/XXXBZ: The goal in these checks is to allow a VLAN
|
|
* interface to be delegated to a jail without allowing the
|
|
* jail to change what underlying interface/VID it is
|
|
* associated with. We are not entirely convinced that this
|
|
* is the right way to accomplish that policy goal.
|
|
*/
|
|
if (ifp->if_vnet != ifp->if_home_vnet) {
|
|
error = EPERM;
|
|
break;
|
|
}
|
|
#endif
|
|
error = copyin(ifr->ifr_data, &vlr, sizeof(vlr));
|
|
if (error)
|
|
break;
|
|
if (vlr.vlr_parent[0] == '\0') {
|
|
vlan_unconfig(ifp);
|
|
break;
|
|
}
|
|
p = ifunit(vlr.vlr_parent);
|
|
if (p == NULL) {
|
|
error = ENOENT;
|
|
break;
|
|
}
|
|
error = vlan_config(ifv, p, vlr.vlr_tag);
|
|
if (error)
|
|
break;
|
|
|
|
/* Update flags on the parent, if necessary. */
|
|
vlan_setflags(ifp, 1);
|
|
break;
|
|
|
|
case SIOCGETVLAN:
|
|
#ifdef VIMAGE
|
|
if (ifp->if_vnet != ifp->if_home_vnet) {
|
|
error = EPERM;
|
|
break;
|
|
}
|
|
#endif
|
|
bzero(&vlr, sizeof(vlr));
|
|
VLAN_LOCK();
|
|
if (TRUNK(ifv) != NULL) {
|
|
strlcpy(vlr.vlr_parent, PARENT(ifv)->if_xname,
|
|
sizeof(vlr.vlr_parent));
|
|
vlr.vlr_tag = ifv->ifv_vid;
|
|
}
|
|
VLAN_UNLOCK();
|
|
error = copyout(&vlr, ifr->ifr_data, sizeof(vlr));
|
|
break;
|
|
|
|
case SIOCSIFFLAGS:
|
|
/*
|
|
* We should propagate selected flags to the parent,
|
|
* e.g., promiscuous mode.
|
|
*/
|
|
if (TRUNK(ifv) != NULL)
|
|
error = vlan_setflags(ifp, 1);
|
|
break;
|
|
|
|
case SIOCADDMULTI:
|
|
case SIOCDELMULTI:
|
|
/*
|
|
* If we don't have a parent, just remember the membership for
|
|
* when we do.
|
|
*/
|
|
trunk = TRUNK(ifv);
|
|
if (trunk != NULL) {
|
|
TRUNK_LOCK(trunk);
|
|
error = vlan_setmulti(ifp);
|
|
TRUNK_UNLOCK(trunk);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
return (error);
|
|
}
|