bpf.c revision 256281
1139823Simp/*- 211150Swollman * Copyright (c) 1990, 1991, 1993 31541Srgrimes * The Regents of the University of California. All rights reserved. 41541Srgrimes * 51541Srgrimes * This code is derived from the Stanford/CMU enet packet filter, 61541Srgrimes * (net/enet.c) distributed as part of 4.3BSD, and code contributed 71541Srgrimes * to Berkeley by Steven McCanne and Van Jacobson both of Lawrence 81541Srgrimes * Berkeley Laboratory. 91541Srgrimes * 101541Srgrimes * Redistribution and use in source and binary forms, with or without 111541Srgrimes * modification, are permitted provided that the following conditions 121541Srgrimes * are met: 131541Srgrimes * 1. Redistributions of source code must retain the above copyright 141541Srgrimes * notice, this list of conditions and the following disclaimer. 151541Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 161541Srgrimes * notice, this list of conditions and the following disclaimer in the 171541Srgrimes * documentation and/or other materials provided with the distribution. 181541Srgrimes * 4. Neither the name of the University nor the names of its contributors 191541Srgrimes * may be used to endorse or promote products derived from this software 201541Srgrimes * without specific prior written permission. 211541Srgrimes * 221541Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 231541Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 241541Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 251541Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 261541Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 271541Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 281541Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2911150Swollman * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 301541Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 311541Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32172467Ssilby * SUCH DAMAGE. 33172467Ssilby * 34172467Ssilby * @(#)bpf.c 8.4 (Berkeley) 1/9/95 3532752Seivind */ 36125680Sbms 3754263Sshin#include <sys/cdefs.h> 3856041Sshin__FBSDID("$FreeBSD: stable/10/sys/net/bpf.c 250945 2013-05-23 21:33:10Z ghelmer $"); 3929514Sjoerg 4029514Sjoerg#include "opt_bpf.h" 411541Srgrimes#include "opt_compat.h" 421541Srgrimes#include "opt_netgraph.h" 4350673Sjlemon 44216758Slstewart#include <sys/types.h> 4512172Sphk#include <sys/param.h> 46216758Slstewart#include <sys/lock.h> 4712172Sphk#include <sys/rwlock.h> 48194368Sbz#include <sys/systm.h> 491541Srgrimes#include <sys/conf.h> 501541Srgrimes#include <sys/fcntl.h> 5155679Sshin#include <sys/jail.h> 5255679Sshin#include <sys/malloc.h> 5355679Sshin#include <sys/mbuf.h> 54164033Srwatson#include <sys/time.h> 5548758Sgreen#include <sys/priv.h> 561541Srgrimes#include <sys/proc.h> 571541Srgrimes#include <sys/signalvar.h> 581541Srgrimes#include <sys/filio.h> 5975619Skris#include <sys/sockio.h> 6034923Sbde#include <sys/ttycom.h> 6192760Sjeff#include <sys/uio.h> 621541Srgrimes 631541Srgrimes#include <sys/event.h> 641541Srgrimes#include <sys/file.h> 65196019Srwatson#include <sys/poll.h> 661541Srgrimes#include <sys/proc.h> 67215166Slstewart 681541Srgrimes#include <sys/socket.h> 69221250Sbz 701541Srgrimes#include <net/if.h> 71221250Sbz#define BPF_INTERNAL 721541Srgrimes#include <net/bpf.h> 73221250Sbz#include <net/bpf_buffer.h> 74221250Sbz#ifdef BPF_JITTER 7555679Sshin#include <net/bpf_jitter.h> 7655679Sshin#endif 7755679Sshin#include <net/bpf_zerocopy.h> 7855679Sshin#include <net/bpfdesc.h> 79148385Sume#include <net/vnet.h> 80122922Sandre 8155679Sshin#include <netinet/in.h> 82221250Sbz#include <netinet/if_ether.h> 831541Srgrimes#include <sys/kernel.h> 841541Srgrimes#include <sys/sysctl.h> 851541Srgrimes 861541Srgrimes#include <net80211/ieee80211_freebsd.h> 87171605Ssilby 8855679Sshin#include <security/mac/mac_framework.h> 8955679Sshin 9055679SshinMALLOC_DEFINE(M_BPF, "BPF", "BPF data"); 911541Srgrimes 926283Swollman#if defined(DEV_BPF) || defined(NETGRAPH_BPF) 936283Swollman 946283Swollman#define PRINET 26 /* interruptible */ 95221250Sbz 9655679Sshin#define SIZEOF_BPF_HDR(type) \ 97221250Sbz (offsetof(type, bh_hdrlen) + sizeof(((type *)0)->bh_hdrlen)) 98252555Snp 99252555Snp#ifdef COMPAT_FREEBSD32 100252555Snp#include <sys/mount.h> 1011541Srgrimes#include <compat/freebsd32/freebsd32.h> 102171167Sgnn#define BPF_ALIGNMENT32 sizeof(int32_t) 103105199Ssam#define BPF_WORDALIGN32(x) (((x)+(BPF_ALIGNMENT32-1))&~(BPF_ALIGNMENT32-1)) 104125680Sbms 105105199Ssam#ifndef BURN_BRIDGES 106105199Ssam/* 107105199Ssam * 32-bit version of structure prepended to each packet. We use this header 108125680Sbms * instead of the standard one for 32-bit streams. We mark the a stream as 109183001Sbz * 32-bit the first time we see a 32-bit compat ioctl request. 110171167Sgnn */ 111105199Ssamstruct bpf_hdr32 { 11258698Sjlemon struct timeval32 bh_tstamp; /* time stamp */ 11382122Ssilby uint32_t bh_caplen; /* length of captured portion */ 11458698Sjlemon uint32_t bh_datalen; /* original length of packet */ 115163606Srwatson uint16_t bh_hdrlen; /* length of bpf header (this struct 116163606Srwatson plus alignment padding) */ 117207369Sbz}; 11852904Sshin#endif 119207369Sbz 12052904Sshinstruct bpf_program32 { 12152904Sshin u_int bf_len; 122182846Sbz uint32_t bf_insns; 123182846Sbz}; 124182846Sbz 125182846Sbzstruct bpf_dltlist32 { 126182846Sbz u_int bfl_len; 127182848Sbz u_int bfl_list; 128182846Sbz}; 129182846Sbz 130182846Sbz#define BIOCSETF32 _IOW('B', 103, struct bpf_program32) 131182846Sbz#define BIOCSRTIMEOUT32 _IOW('B', 109, struct timeval32) 132182846Sbz#define BIOCGRTIMEOUT32 _IOR('B', 110, struct timeval32) 133182848Sbz#define BIOCGDLTLIST32 _IOWR('B', 121, struct bpf_dltlist32) 134182846Sbz#define BIOCSETWF32 _IOW('B', 123, struct bpf_program32) 135182846Sbz#define BIOCSETFNR32 _IOW('B', 130, struct bpf_program32) 136182846Sbz#endif 137182846Sbz 138195699Srwatson/* 139195699Srwatson * bpf_iflist is a list of BPF interface structures, each corresponding to a 140185348Szec * specific DLT. The same network interface might have several BPF interface 141185348Szec * structures registered by different layers in the stack (i.e., 802.11 142182846Sbz * frames, ethernet frames, etc). 143182846Sbz */ 144182846Sbzstatic LIST_HEAD(, bpf_if) bpf_iflist, bpf_freelist; 145182846Sbzstatic struct mtx bpf_mtx; /* bpf global lock */ 146182846Sbzstatic int bpf_bpfd_cnt; 147182846Sbz 148182846Sbzstatic void bpf_attachd(struct bpf_d *, struct bpf_if *); 149182848Sbzstatic void bpf_detachd(struct bpf_d *); 150182846Sbzstatic void bpf_detachd_locked(struct bpf_d *); 151182846Sbzstatic void bpf_freed(struct bpf_d *); 152182846Sbzstatic int bpf_movein(struct uio *, int, struct ifnet *, struct mbuf **, 153182846Sbz struct sockaddr *, int *, struct bpf_insn *); 154182846Sbzstatic int bpf_setif(struct bpf_d *, struct ifreq *); 155182848Sbzstatic void bpf_timed_out(void *); 156182846Sbzstatic __inline void 157182846Sbz bpf_wakeup(struct bpf_d *); 158182846Sbzstatic void catchpacket(struct bpf_d *, u_char *, u_int, u_int, 159182846Sbz void (*)(struct bpf_d *, caddr_t, u_int, void *, u_int), 160195699Srwatson struct bintime *); 161195699Srwatsonstatic void reset_d(struct bpf_d *); 162185348Szecstatic int bpf_setf(struct bpf_d *, struct bpf_program *, u_long cmd); 163185348Szecstatic int bpf_getdltlist(struct bpf_d *, struct bpf_dltlist *); 164221250Sbzstatic int bpf_setdlt(struct bpf_d *, u_int); 165182846Sbzstatic void filt_bpfdetach(struct knote *); 166124258Sandrestatic int filt_bpfread(struct knote *, long); 167124258Sandrestatic void bpf_drvinit(void *); 168124258Sandrestatic int bpf_stats_sysctl(SYSCTL_HANDLER_ARGS); 169124258Sandre 170124258SandreSYSCTL_NODE(_net, OID_AUTO, bpf, CTLFLAG_RW, 0, "bpf sysctl"); 171124258Sandreint bpf_maxinsns = BPF_MAXINSNS; 172124258SandreSYSCTL_INT(_net_bpf, OID_AUTO, maxinsns, CTLFLAG_RW, 173124258Sandre &bpf_maxinsns, 0, "Maximum bpf program instructions"); 174207369Sbzstatic int bpf_zerocopy_enable = 0; 175195699SrwatsonSYSCTL_INT(_net_bpf, OID_AUTO, zerocopy_enable, CTLFLAG_RW, 176195699Srwatson &bpf_zerocopy_enable, 0, "Enable new zero-copy BPF buffer sessions"); 177252285Sjimharrisstatic SYSCTL_NODE(_net_bpf, OID_AUTO, stats, CTLFLAG_MPSAFE | CTLFLAG_RW, 178124258Sandre bpf_stats_sysctl, "bpf statistics portal"); 179207369Sbz 180195699Srwatsonstatic VNET_DEFINE(int, bpf_optimize_writers) = 0; 181195699Srwatson#define V_bpf_optimize_writers VNET(bpf_optimize_writers) 182183550SzecSYSCTL_VNET_INT(_net_bpf, OID_AUTO, optimize_writers, 18312296Sphk CTLFLAG_RW, &VNET_NAME(bpf_optimize_writers), 0, 184172454Srwatson "Do not send packets until BPF program is set"); 185171640Sandre 186171640Sandrestatic d_open_t bpfopen; 187171640Sandrestatic d_read_t bpfread; 18850426Sjlemonstatic d_write_t bpfwrite; 189121307Ssilbystatic d_ioctl_t bpfioctl; 190167721Sandrestatic d_poll_t bpfpoll; 19150426Sjlemonstatic d_kqfilter_t bpfkqfilter; 19255198Smsmith 193183550Szecstatic struct cdevsw bpf_cdevsw = { 194167721Sandre .d_version = D_VERSION, 19555198Smsmith .d_open = bpfopen, 196217322Smdf .d_read = bpfread, 197195699Srwatson .d_write = bpfwrite, 19836079Swollman .d_ioctl = bpfioctl, 199215701Sdim .d_poll = bpfpoll, 200207369Sbz .d_name = "bpf", 201195699Srwatson .d_kqfilter = bpfkqfilter, 202195699Srwatson}; 20372959Sjlemon 20470103Sphkstatic struct filterops bpfread_filtops = { 205215701Sdim .f_isfd = 1, 206207369Sbz .f_detach = filt_bpfdetach, 207195699Srwatson .f_event = filt_bpfread, 208195699Srwatson}; 209183550Szec 21082122Ssilbyeventhandler_tag bpf_ifdetach_cookie = NULL; 211197236Sandre 212197236Sandre/* 213197236Sandre * LOCKING MODEL USED BY BPF: 214197236Sandre * Locks: 215221023Sattilio * 1) global lock (BPF_LOCK). Mutex, used to protect interface addition/removal, 216221023Sattilio * some global counters and every bpf_if reference. 217221023Sattilio * 2) Interface lock. Rwlock, used to protect list of BPF descriptors and their filters. 218221023Sattilio * 3) Descriptor lock. Mutex, used to protect BPF buffers and various structure fields 219221023Sattilio * used by bpf_mtap code. 220221023Sattilio * 221195699Srwatson * Lock order: 222195727Srwatson * 223130989Sps * Global lock, interface lock, descriptor lock 224216758Slstewart * 225216758Slstewart * We have to acquire interface lock before descriptor main lock due to BPF_MTAP[2] 22698211Shsu * working model. In many places (like bpf_detachd) we start with BPF descriptor 227235051Sglebius * (and we need to at least rlock it to get reliable interface pointer). This 228211462Sandre * gives us potential LOR. As a result, we use global lock to protect from bpf_if 229211462Sandre * change in every such place. 23012296Sphk * 2317684Sdg * Changing d->bd_bif is protected by 1) global lock, 2) interface lock and 23232821Sdg * 3) descriptor main wlock. 23343562Smsmith * Reading bd_bif can be protected by any of these locks, typically global lock. 23443562Smsmith * 23543562Smsmith * Changing read/write BPF filter is protected by the same three locks, 2367684Sdg * the same applies for reading. 2377684Sdg * 23832821Sdg * Sleeping in global lock is not allowed due to bpfdetach() using it. 2397684Sdg */ 2401541Srgrimes 2411541Srgrimes/* 242111145Sjlemon * Wrapper functions for various buffering methods. If the set of buffer 243111145Sjlemon * modes expands, we will probably want to introduce a switch data structure 244123608Sjhb * similar to protosw, et. 245111145Sjlemon */ 24634881Swollmanstatic void 247168615Sandrebpf_append_bytes(struct bpf_d *d, caddr_t buf, u_int offset, void *src, 248168615Sandre u_int len) 249172309Ssilby{ 250216749Slstewart 251216758Slstewart BPFD_LOCK_ASSERT(d); 25234881Swollman 25334881Swollman switch (d->bd_bufmode) { 254215701Sdim case BPF_BUFMODE_BUFFER: 255195727Srwatson return (bpf_buffer_append_bytes(d, buf, offset, src, len)); 256195699Srwatson 257169683Sandre case BPF_BUFMODE_ZBUF: 258157967Srwatson d->bd_zcopy++; 259111145Sjlemon return (bpf_zerocopy_append_bytes(d, buf, offset, src, len)); 260157977Srwatson 261157977Srwatson default: 262157977Srwatson panic("bpf_buf_append_bytes"); 263157977Srwatson } 26434881Swollman} 265157431Srwatson 2661541Srgrimesstatic void 267157927Spsbpf_append_mbuf(struct bpf_d *d, caddr_t buf, u_int offset, void *src, 268157927Sps u_int len) 269157927Sps{ 270157927Sps 271181803Sbz BPFD_LOCK_ASSERT(d); 272190787Szec 273169541Sandre switch (d->bd_bufmode) { 274157927Sps case BPF_BUFMODE_BUFFER: 275157927Sps return (bpf_buffer_append_mbuf(d, buf, offset, src, len)); 276160491Sups 277160491Sups case BPF_BUFMODE_ZBUF: 278160491Sups d->bd_zcopy++; 279165657Sjhb return (bpf_zerocopy_append_mbuf(d, buf, offset, src, len)); 280165657Sjhb 281160491Sups default: 282160491Sups panic("bpf_buf_append_mbuf"); 283160491Sups } 284160491Sups} 2851541Srgrimes 286157431Srwatson/* 2871541Srgrimes * This function gets called when the free buffer is re-assigned. 288185088Szec */ 289169454Srwatsonstatic void 290216758Slstewartbpf_buf_reclaimed(struct bpf_d *d) 291216758Slstewart{ 292216758Slstewart 293216758Slstewart BPFD_LOCK_ASSERT(d); 294216758Slstewart 295216758Slstewart switch (d->bd_bufmode) { 296216758Slstewart case BPF_BUFMODE_BUFFER: 297185088Szec return; 29877900Speter 29943576Smsmith case BPF_BUFMODE_ZBUF: 30043562Smsmith bpf_zerocopy_buf_reclaimed(d); 30143562Smsmith return; 30243562Smsmith 303205157Srwatson default: 304222748Srwatson panic("bpf_buf_reclaimed"); 305222748Srwatson } 306205157Srwatson} 307190787Szec 308190787Szec/* 309190787Szec * If the buffer mechanism has a way to decide that a held buffer can be made 310190787Szec * free, then it is exposed via the bpf_canfreebuf() interface. (1) is 311190787Szec * returned if the buffer can be discarded, (0) is returned if it cannot. 312190787Szec */ 313207369Sbzstatic int 314190787Szecbpf_canfreebuf(struct bpf_d *d) 315190787Szec{ 316190787Szec 317207369Sbz BPFD_LOCK_ASSERT(d); 318207369Sbz 319190787Szec switch (d->bd_bufmode) { 320190787Szec case BPF_BUFMODE_ZBUF: 321190787Szec return (bpf_zerocopy_canfreebuf(d)); 322190787Szec } 323190787Szec return (0); 324190787Szec} 325190787Szec 326285980Sdelphij/* 327285980Sdelphij * Allow the buffer model to indicate that the current store buffer is 328190787Szec * immutable, regardless of the appearance of space. Return (1) if the 329190787Szec * buffer is writable, and (0) if not. 330190787Szec */ 331190787Szecstatic int 332190787Szecbpf_canwritebuf(struct bpf_d *d) 333190787Szec{ 334190787Szec BPFD_LOCK_ASSERT(d); 335190787Szec 336190787Szec switch (d->bd_bufmode) { 337190787Szec case BPF_BUFMODE_ZBUF: 338190787Szec return (bpf_zerocopy_canwritebuf(d)); 339190787Szec } 340190787Szec return (1); 341190787Szec} 342197236Sandre 343197236Sandre/* 344224010Sbz * Notify buffer model that an attempt to write to the store buffer has 345197236Sandre * resulted in a dropped packet, in which case the buffer may be considered 346224010Sbz * full. 347223839Sandre */ 348197236Sandrestatic void 349223839Sandrebpf_buffull(struct bpf_d *d) 350197236Sandre{ 351197236Sandre 35255679Sshin BPFD_LOCK_ASSERT(d); 35355679Sshin 35455679Sshin switch (d->bd_bufmode) { 35555679Sshin case BPF_BUFMODE_ZBUF: 35655679Sshin bpf_zerocopy_buffull(d); 35755679Sshin break; 35855679Sshin } 35955679Sshin} 3601541Srgrimes 36155679Sshin/* 362190787Szec * Notify the buffer model that a buffer has moved into the hold position. 363157977Srwatson */ 364128452Ssilbyvoid 365128452Ssilbybpf_bufheld(struct bpf_d *d) 366157927Sps{ 367157927Sps 3681541Srgrimes BPFD_LOCK_ASSERT(d); 3691541Srgrimes 370193731Szec switch (d->bd_bufmode) { 371128452Ssilby case BPF_BUFMODE_ZBUF: 372193731Szec bpf_zerocopy_bufheld(d); 373193731Szec break; 374193731Szec } 375193731Szec} 376193731Szec 377204838Sbzstatic void 378205157Srwatsonbpf_free(struct bpf_d *d) 379204838Sbz{ 380204838Sbz 381193731Szec switch (d->bd_bufmode) { 382193731Szec case BPF_BUFMODE_BUFFER: 383193731Szec return (bpf_buffer_free(d)); 384193731Szec 385157431Srwatson case BPF_BUFMODE_ZBUF: 386128452Ssilby return (bpf_zerocopy_free(d)); 387157431Srwatson 388128452Ssilby default: 389128452Ssilby panic("bpf_buf_free"); 3901541Srgrimes } 39178642Ssilby} 39278642Ssilby 39378642Ssilbystatic int 3941541Srgrimesbpf_uiomove(struct bpf_d *d, caddr_t buf, u_int len, struct uio *uio) 39578642Ssilby{ 396157431Srwatson 3971541Srgrimes if (d->bd_bufmode != BPF_BUFMODE_BUFFER) 398111144Sjlemon return (EOPNOTSUPP); 3991541Srgrimes return (bpf_buffer_uiomove(d, buf, len, uio)); 400178285Srwatson} 401138410Srwatson 40255679Sshinstatic int 40355679Sshinbpf_ioctl_sblen(struct bpf_d *d, u_int *i) 40478642Ssilby{ 40555679Sshin 40678642Ssilby if (d->bd_bufmode != BPF_BUFMODE_BUFFER) 40755679Sshin return (EOPNOTSUPP); 408186141Sbz return (bpf_buffer_ioctl_sblen(d, i)); 40955679Sshin} 41055679Sshin 41155679Sshinstatic int 412182855Sbzbpf_ioctl_getzmax(struct thread *td, struct bpf_d *d, size_t *i) 41355679Sshin{ 41455679Sshin 415221250Sbz if (d->bd_bufmode != BPF_BUFMODE_ZBUF) 416221250Sbz return (EOPNOTSUPP); 417221250Sbz return (bpf_zerocopy_ioctl_getzmax(td, d, i)); 418221250Sbz} 41955679Sshin 420221250Sbzstatic int 42178642Ssilbybpf_ioctl_rotzbuf(struct thread *td, struct bpf_d *d, struct bpf_zbuf *bz) 422111144Sjlemon{ 42355679Sshin 424111144Sjlemon if (d->bd_bufmode != BPF_BUFMODE_ZBUF) 425111144Sjlemon return (EOPNOTSUPP); 426111144Sjlemon return (bpf_zerocopy_ioctl_rotzbuf(td, d, bz)); 427111144Sjlemon} 428111144Sjlemon 429111144Sjlemonstatic int 430111144Sjlemonbpf_ioctl_setzbuf(struct thread *td, struct bpf_d *d, struct bpf_zbuf *bz) 431111144Sjlemon{ 432111144Sjlemon 433111144Sjlemon if (d->bd_bufmode != BPF_BUFMODE_ZBUF) 434111144Sjlemon return (EOPNOTSUPP); 435111144Sjlemon return (bpf_zerocopy_ioctl_setzbuf(td, d, bz)); 43678642Ssilby} 437221250Sbz 438111144Sjlemon/* 439111144Sjlemon * General BPF functions. 440111144Sjlemon */ 441111144Sjlemonstatic int 442111144Sjlemonbpf_movein(struct uio *uio, int linktype, struct ifnet *ifp, struct mbuf **mp, 443111144Sjlemon struct sockaddr *sockp, int *hdrlen, struct bpf_insn *wfilter) 444111144Sjlemon{ 445111144Sjlemon const struct ieee80211_bpf_params *p; 446111144Sjlemon struct ether_header *eh; 447111144Sjlemon struct mbuf *m; 44878642Ssilby int error; 44978642Ssilby int len; 45078642Ssilby int hlen; 45178642Ssilby int slen; 45278642Ssilby 45378642Ssilby /* 45478642Ssilby * Build a sockaddr based on the data link layer type. 45578642Ssilby * We do this at this level because the ethernet header 456157431Srwatson * is copied directly into the data field of the sockaddr. 45778642Ssilby * In the case of SLIP, there is no header and the packet 458179487Srwatson * is forwarded as is. 45978642Ssilby * Also, we are careful to leave room at the front of the mbuf 460179487Srwatson * for the link level header. 461179487Srwatson */ 462179487Srwatson switch (linktype) { 463179487Srwatson 464179487Srwatson case DLT_SLIP: 4651541Srgrimes sockp->sa_family = AF_INET; 4661541Srgrimes hlen = 0; 4671541Srgrimes break; 4681541Srgrimes 469127870Srwatson case DLT_EN10MB: 4701541Srgrimes sockp->sa_family = AF_UNSPEC; 4711541Srgrimes /* XXX Would MAXLINKHDR be better? */ 47278642Ssilby hlen = ETHER_HDR_LEN; 47378642Ssilby break; 47478642Ssilby 4751541Srgrimes case DLT_FDDI: 4761541Srgrimes sockp->sa_family = AF_IMPLINK; 4771541Srgrimes hlen = 0; 47831848Sjulian break; 47931848Sjulian 4801541Srgrimes case DLT_RAW: 4811541Srgrimes sockp->sa_family = AF_UNSPEC; 482169454Srwatson hlen = 0; 483169454Srwatson break; 4841541Srgrimes 485167785Sandre case DLT_NULL: 4861541Srgrimes /* 48755679Sshin * null interface types require a 4 byte pseudo header which 48855679Sshin * corresponds to the address family of the packet. 48955679Sshin */ 49055679Sshin sockp->sa_family = AF_UNSPEC; 49155679Sshin hlen = 4; 49255679Sshin break; 49355679Sshin 494128905Srwatson case DLT_ATM_RFC1483: 4951541Srgrimes /* 496101137Srwatson * en atm driver requires 4-byte atm pseudo header. 497101137Srwatson * though it isn't standard, vpi:vci needs to be 49855679Sshin * specified anyway. 499221250Sbz */ 50055679Sshin sockp->sa_family = AF_UNSPEC; 50155679Sshin hlen = 12; /* XXX 4(ATM_PH) + 3(LLC) + 5(SNAP) */ 50255679Sshin break; 50355679Sshin 504127871Srwatson case DLT_PPP: 505122327Ssam sockp->sa_family = AF_UNSPEC; 506122327Ssam hlen = 4; /* This should match PPP_HDRLEN */ 507178285Srwatson break; 508128905Srwatson 509128905Srwatson case DLT_IEEE802_11: /* IEEE 802.11 wireless */ 510128905Srwatson sockp->sa_family = AF_IEEE80211; 511128905Srwatson hlen = 0; 51257576Sps break; 513122327Ssam 51457576Sps case DLT_IEEE802_11_RADIO: /* IEEE 802.11 wireless w/ phy params */ 51557576Sps sockp->sa_family = AF_IEEE80211; 51657576Sps sockp->sa_len = 12; /* XXX != 0 */ 5171541Srgrimes hlen = sizeof(struct ieee80211_bpf_params); 518127870Srwatson break; 519151967Sandre 5201541Srgrimes default: 5211541Srgrimes return (EIO); 5221541Srgrimes } 5231541Srgrimes 52455679Sshin len = uio->uio_resid; 52555679Sshin if (len < hlen || len - hlen > ifp->if_mtu) 526133874Srwatson return (EMSGSIZE); 52755679Sshin 52855679Sshin m = m_get2(len, M_WAITOK, MT_DATA, M_PKTHDR); 52955679Sshin if (m == NULL) 53055679Sshin return (EIO); 53155679Sshin m->m_pkthdr.len = m->m_len = len; 53255679Sshin *mp = m; 53355679Sshin 53455679Sshin error = uiomove(mtod(m, u_char *), len, uio); 53555679Sshin if (error) 53655679Sshin goto bad; 53755679Sshin 5381541Srgrimes slen = bpf_filter(wfilter, mtod(m, u_char *), len, len); 5391541Srgrimes if (slen == 0) { 540178888Sjulian error = EPERM; 541178888Sjulian goto bad; 542178888Sjulian } 543178888Sjulian 5441541Srgrimes /* Check for multicast destination */ 545127870Srwatson switch (linktype) { 54655679Sshin case DLT_EN10MB: 547223765Seri eh = mtod(m, struct ether_header *); 54855679Sshin if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 5491541Srgrimes if (bcmp(ifp->if_broadcastaddr, eh->ether_dhost, 5501541Srgrimes ETHER_ADDR_LEN) == 0) 55155679Sshin m->m_flags |= M_BCAST; 55255679Sshin else 55355679Sshin m->m_flags |= M_MCAST; 55455679Sshin } 55555679Sshin break; 55655679Sshin } 55755679Sshin 558188578Sluigi /* 55955679Sshin * Make room for link header, and copy it to sockaddr 56055679Sshin */ 56155679Sshin if (hlen != 0) { 56255679Sshin if (sockp->sa_family == AF_IEEE80211) { 56355679Sshin /* 56455679Sshin * Collect true length from the parameter header 56555679Sshin * NB: sockp is known to be zero'd so if we do a 56655679Sshin * short copy unspecified parameters will be 56755679Sshin * zero. 56855679Sshin * NB: packet may not be aligned after stripping 56955679Sshin * bpf params 570188578Sluigi * XXX check ibp_vers 5711541Srgrimes */ 5721541Srgrimes p = mtod(m, const struct ieee80211_bpf_params *); 57355679Sshin hlen = p->ibp_len; 57455679Sshin if (hlen > sizeof(sockp->sa_data)) { 57590198Sume error = EINVAL; 57690198Sume goto bad; 57790198Sume } 578238237Sbz } 57955679Sshin bcopy(m->m_data, sockp->sa_data, hlen); 580221250Sbz } 58155679Sshin *hdrlen = hlen; 582221250Sbz 583221250Sbz return (0); 584221250Sbzbad: 585221250Sbz m_freem(m); 586133874Srwatson return (error); 587133874Srwatson} 588133874Srwatson 589181803Sbz/* 590181803Sbz * Attach file to the bpf interface, i.e. make d listen on bp. 591133874Srwatson */ 592133874Srwatsonstatic void 593221250Sbzbpf_attachd(struct bpf_d *d, struct bpf_if *bp) 5941541Srgrimes{ 5951541Srgrimes int op_w; 596127870Srwatson 597101106Srwatson BPF_LOCK_ASSERT(); 598122327Ssam 599101106Srwatson /* 600101106Srwatson * Save sysctl value to protect from sysctl change 601101106Srwatson * between reads 602101106Srwatson */ 603178285Srwatson op_w = V_bpf_optimize_writers; 604172930Srwatson 605101106Srwatson if (d->bd_bif != NULL) 606101106Srwatson bpf_detachd_locked(d); 607119245Srwatson /* 608119245Srwatson * Point d at bp, and add d to the interface's list. 609101106Srwatson * Since there are many applicaiotns using BPF for 610172930Srwatson * sending raw packets only (dhcpd, cdpd are good examples) 611101106Srwatson * we can delay adding d to the list of active listeners until 612101106Srwatson * some filter is configured. 61355679Sshin */ 61455679Sshin 61555679Sshin BPFIF_WLOCK(bp); 61655679Sshin BPFD_LOCK(d); 61755679Sshin 618127870Srwatson d->bd_bif = bp; 61955679Sshin 6201541Srgrimes if (op_w != 0) { 62155679Sshin /* Add to writers-only list */ 62255679Sshin LIST_INSERT_HEAD(&bp->bif_wlist, d, bd_next); 623238237Sbz /* 624238237Sbz * We decrement bd_writer on every filter set operation. 62555679Sshin * First BIOCSETF is done by pcap_open_live() to set up 62655679Sshin * snap length. After that appliation usually sets its own filter 627238247Sbz */ 628238237Sbz d->bd_writer = 2; 629238237Sbz } else 630127870Srwatson LIST_INSERT_HEAD(&bp->bif_dlist, d, bd_next); 631127870Srwatson 632221250Sbz BPFD_UNLOCK(d); 63355679Sshin BPFIF_WUNLOCK(bp); 634221250Sbz 635221250Sbz bpf_bpfd_cnt++; 636221250Sbz 637221250Sbz CTR3(KTR_NET, "%s: bpf_attach called by pid %d, adding to %s list", 638133874Srwatson __func__, d->bd_pid, d->bd_writer ? "writer" : "active"); 639238247Sbz 640133874Srwatson if (op_w == 0) 641133874Srwatson EVENTHANDLER_INVOKE(bpf_track, bp->bif_ifp, bp->bif_dlt, 1); 642133874Srwatson} 643221250Sbz 6446283Swollman/* 645122327Ssam * Add d to the list of active bp filters. 64655679Sshin * Reuqires bpf_attachd() to be called before 6476283Swollman */ 64855679Sshinstatic void 649122922Sandrebpf_upgraded(struct bpf_d *d) 650122922Sandre{ 651221250Sbz struct bpf_if *bp; 652221250Sbz 653122922Sandre BPF_LOCK_ASSERT(); 654221250Sbz 655221250Sbz bp = d->bd_bif; 656221250Sbz 657221250Sbz /* 6581541Srgrimes * Filter can be set several times without specifying interface. 6591541Srgrimes * Mark d as reader and exit. 6601541Srgrimes */ 6611541Srgrimes if (bp == NULL) { 6621541Srgrimes BPFD_LOCK(d); 66334881Swollman d->bd_writer = 0; 66434881Swollman BPFD_UNLOCK(d); 6651541Srgrimes return; 6661541Srgrimes } 667157431Srwatson 6681541Srgrimes BPFIF_WLOCK(bp); 669111145Sjlemon BPFD_LOCK(d); 670111145Sjlemon 67155679Sshin /* Remove from writers-only list */ 67255679Sshin LIST_REMOVE(d, bd_next); 67355679Sshin LIST_INSERT_HEAD(&bp->bif_dlist, d, bd_next); 6741541Srgrimes /* Mark d as reader */ 675190787Szec d->bd_writer = 0; 676111145Sjlemon 677111145Sjlemon BPFD_UNLOCK(d); 678111145Sjlemon BPFIF_WUNLOCK(bp); 679215166Slstewart 680215166Slstewart CTR2(KTR_NET, "%s: upgrade required by pid %d", __func__, d->bd_pid); 681215166Slstewart 682215166Slstewart EVENTHANDLER_INVOKE(bpf_track, bp->bif_ifp, bp->bif_dlt, 1); 683215166Slstewart} 684215166Slstewart 685215166Slstewart/* 686215166Slstewart * Detach a file from its interface. 687215166Slstewart */ 688215166Slstewartstatic void 689215166Slstewartbpf_detachd(struct bpf_d *d) 690215166Slstewart{ 691215166Slstewart BPF_LOCK(); 692215166Slstewart bpf_detachd_locked(d); 693215166Slstewart BPF_UNLOCK(); 694215166Slstewart} 695215166Slstewart 696215166Slstewartstatic void 697215166Slstewartbpf_detachd_locked(struct bpf_d *d) 698215166Slstewart{ 699216758Slstewart int error; 700216758Slstewart struct bpf_if *bp; 701216758Slstewart struct ifnet *ifp; 702216758Slstewart 703216758Slstewart CTR2(KTR_NET, "%s: detach required by pid %d", __func__, d->bd_pid); 704216758Slstewart 705191688Szec BPF_LOCK_ASSERT(); 706191688Szec 707191688Szec /* Check if descriptor is attached */ 708172309Ssilby if ((bp = d->bd_bif) == NULL) 709111145Sjlemon return; 71055679Sshin 71155679Sshin BPFIF_WLOCK(bp); 712181803Sbz BPFD_LOCK(d); 71355679Sshin 714181803Sbz /* Save bd_writer value */ 7151541Srgrimes error = d->bd_writer; 71650673Sjlemon 717172309Ssilby /* 718172309Ssilby * Remove d from the interface's descriptor list. 719172309Ssilby */ 720172309Ssilby LIST_REMOVE(d, bd_next); 721172309Ssilby 72250673Sjlemon ifp = bp->bif_ifp; 723181803Sbz d->bd_bif = NULL; 7246283Swollman BPFD_UNLOCK(d); 725181803Sbz BPFIF_WUNLOCK(bp); 726169317Sandre 727147735Sps bpf_bpfd_cnt--; 72834881Swollman 7291541Srgrimes /* Call event handler iff d is attached */ 7301541Srgrimes if (error == 0) 73116367Swollman EVENTHANDLER_INVOKE(bpf_track, ifp, bp->bif_dlt, 0); 7321541Srgrimes 7331541Srgrimes /* 7341541Srgrimes * Check if this descriptor had requested promiscuous mode. 73516367Swollman * If so, turn it off. 736100335Sdillon */ 73716367Swollman if (d->bd_promisc) { 7381541Srgrimes d->bd_promisc = 0; 7391541Srgrimes CURVNET_SET(ifp->if_vnet); 74050673Sjlemon error = ifpromisc(ifp, 0); 741133874Srwatson CURVNET_RESTORE(); 74256564Sshin if (error != 0 && error != ENXIO) { 74356564Sshin /* 74456564Sshin * ENXIO can happen if a pccard is unplugged 74556564Sshin * Something is really wrong if we were able to put 746181803Sbz * the driver into promiscuous mode, but can't 747157432Srwatson * take it out. 74834881Swollman */ 7491541Srgrimes if_printf(bp->bif_ifp, 7501541Srgrimes "bpf_detach: ifpromisc failed (%d)\n", error); 7511541Srgrimes } 752215392Slstewart } 753215392Slstewart} 754215392Slstewart 755215392Slstewart/* 756215392Slstewart * Close the descriptor by detaching it from its interface, 757215392Slstewart * deallocating its buffers, and marking it free. 758215392Slstewart */ 759215392Slstewartstatic void 760215392Slstewartbpf_dtor(void *data) 761215392Slstewart{ 762215392Slstewart struct bpf_d *d = data; 763215392Slstewart 764215392Slstewart BPFD_LOCK(d); 765215392Slstewart if (d->bd_state == BPF_WAITING) 766215392Slstewart callout_stop(&d->bd_callout); 767215392Slstewart d->bd_state = BPF_IDLE; 768215392Slstewart BPFD_UNLOCK(d); 769215392Slstewart funsetown(&d->bd_sigio); 770215392Slstewart bpf_detachd(d); 771215392Slstewart#ifdef MAC 772215392Slstewart mac_bpfdesc_destroy(d); 773215392Slstewart#endif /* MAC */ 774215392Slstewart seldrain(&d->bd_sel); 775215392Slstewart knlist_destroy(&d->bd_sel.si_note); 776215392Slstewart callout_drain(&d->bd_callout); 777215392Slstewart bpf_freed(d); 778215392Slstewart free(d, M_BPF); 779215392Slstewart} 780215392Slstewart 781215392Slstewart/* 782215392Slstewart * Open ethernet device. Returns ENXIO for illegal minor device number, 783215392Slstewart * EBUSY if file is open by another process. 784215392Slstewart */ 785215392Slstewart/* ARGSUSED */ 786215392Slstewartstatic int 787215392Slstewartbpfopen(struct cdev *dev, int flags, int fmt, struct thread *td) 788215392Slstewart{ 789215392Slstewart struct bpf_d *d; 790215392Slstewart int error, size; 791215392Slstewart 792215392Slstewart d = malloc(sizeof(*d), M_BPF, M_WAITOK | M_ZERO); 793215392Slstewart error = devfs_set_cdevpriv(d, bpf_dtor); 794215392Slstewart if (error != 0) { 795215392Slstewart free(d, M_BPF); 796215392Slstewart return (error); 797215392Slstewart } 798215392Slstewart 799215392Slstewart /* 800215392Slstewart * For historical reasons, perform a one-time initialization call to 801215392Slstewart * the buffer routines, even though we're not yet committed to a 802215392Slstewart * particular buffer method. 803215392Slstewart */ 804215392Slstewart bpf_buffer_init(d); 805215392Slstewart d->bd_hbuf_in_use = 0; 806215392Slstewart d->bd_bufmode = BPF_BUFMODE_BUFFER; 807215392Slstewart d->bd_sig = SIGIO; 808215392Slstewart d->bd_direction = BPF_D_INOUT; 809215392Slstewart BPF_PID_REFRESH(d, td); 810215392Slstewart#ifdef MAC 811215392Slstewart mac_bpfdesc_init(d); 812215392Slstewart mac_bpfdesc_create(td->td_ucred, d); 813215392Slstewart#endif 814215392Slstewart mtx_init(&d->bd_lock, devtoname(dev), "bpf cdev lock", MTX_DEF); 8151541Srgrimes callout_init_mtx(&d->bd_callout, &d->bd_lock, 0); 8161541Srgrimes knlist_init_mtx(&d->bd_sel.si_note, &d->bd_lock); 8171541Srgrimes 8181541Srgrimes /* Allocate default buffers */ 8191541Srgrimes size = d->bd_bufsize; 820157431Srwatson bpf_buffer_ioctl_sblen(d, &size); 8211541Srgrimes 8221541Srgrimes return (0); 8231541Srgrimes} 824181803Sbz 825178285Srwatson/* 826146864Srwatson * bpfread - read next chunk of packets from buffers 8271541Srgrimes */ 8281541Srgrimesstatic int 829252555Snpbpfread(struct cdev *dev, struct uio *uio, int ioflag) 830190948Srwatson{ 8311541Srgrimes struct bpf_d *d; 832190948Srwatson int error; 8331541Srgrimes int non_block; 8341541Srgrimes int timed_out; 8351541Srgrimes 8361541Srgrimes error = devfs_get_cdevpriv((void **)&d); 8371541Srgrimes if (error != 0) 8381541Srgrimes return (error); 839157376Srwatson 840157431Srwatson /* 8411541Srgrimes * Restrict application to use a buffer the same size as 8421541Srgrimes * as kernel buffers. 8431541Srgrimes */ 84455679Sshin if (uio->uio_resid != d->bd_bufsize) 84555679Sshin return (EINVAL); 84655679Sshin 8471541Srgrimes non_block = ((ioflag & O_NONBLOCK) != 0); 848178285Srwatson 849138410Srwatson BPFD_LOCK(d); 8501541Srgrimes BPF_PID_REFRESH_CUR(d); 851204829Srwatson if (d->bd_bufmode != BPF_BUFMODE_BUFFER) { 852204829Srwatson BPFD_UNLOCK(d); 853204829Srwatson return (EOPNOTSUPP); 854204829Srwatson } 855204829Srwatson if (d->bd_state == BPF_WAITING) 856204829Srwatson callout_stop(&d->bd_callout); 857204829Srwatson timed_out = (d->bd_state == BPF_TIMED_OUT); 858204829Srwatson d->bd_state = BPF_IDLE; 859204829Srwatson while (d->bd_hbuf_in_use) { 860204829Srwatson error = mtx_sleep(&d->bd_hbuf_in_use, &d->bd_lock, 861204829Srwatson PRINET|PCATCH, "bd_hbuf", 0); 862204829Srwatson if (error != 0) { 863204829Srwatson BPFD_UNLOCK(d); 86450673Sjlemon return (error); 865172309Ssilby } 866172309Ssilby } 867172309Ssilby /* 868172309Ssilby * If the hold buffer is empty, then do a timed sleep, which 869172309Ssilby * ends when the timeout expires or when enough packets 87050673Sjlemon * have arrived to fill the store buffer. 87150673Sjlemon */ 8729373Swollman while (d->bd_hbuf == NULL) { 8739373Swollman if (d->bd_slen != 0) { 874122922Sandre /* 875122922Sandre * A packet(s) either arrived since the previous 876122922Sandre * read or arrived while we were asleep. 877122922Sandre */ 878122922Sandre if (d->bd_immediate || non_block || timed_out) { 879122922Sandre /* 8801541Srgrimes * Rotate the buffers and return what's here 881122922Sandre * if we are in immediate mode, non-blocking 882122922Sandre * flag is set, or this descriptor timed out. 883122922Sandre */ 8841541Srgrimes ROTATE_BUFFERS(d); 885122922Sandre break; 8861541Srgrimes } 887122922Sandre } 888122922Sandre 889122922Sandre /* 890122922Sandre * No data is available, check to see if the bpf device 891160925Srwatson * is still pointed at a real interface. If not, return 892160925Srwatson * ENXIO so that the userland process knows to rebind 893160925Srwatson * it before using it again. 8941541Srgrimes */ 895122922Sandre if (d->bd_bif == NULL) { 896122922Sandre BPFD_UNLOCK(d); 8971541Srgrimes return (ENXIO); 8981541Srgrimes } 8991541Srgrimes 9001541Srgrimes if (non_block) { 901122922Sandre BPFD_UNLOCK(d); 902122922Sandre return (EWOULDBLOCK); 903122922Sandre } 904122922Sandre error = msleep(d, &d->bd_lock, PRINET|PCATCH, 90555679Sshin "bpf", d->bd_rtout); 90655679Sshin if (error == EINTR || error == ERESTART) { 90755679Sshin BPFD_UNLOCK(d); 90855679Sshin return (error); 90955679Sshin } 91055679Sshin if (error == EWOULDBLOCK) { 91155679Sshin /* 91255679Sshin * On a timeout, return what's in the buffer, 91355679Sshin * which may be nothing. If there is something 914122922Sandre * in the store buffer, we can rotate the buffers. 915122922Sandre */ 916122922Sandre if (d->bd_hbuf) 917122922Sandre /* 918122922Sandre * We filled up the buffer in between 919122922Sandre * getting the timeout and arriving 920122922Sandre * here, so we don't need to rotate. 921133874Srwatson */ 922122922Sandre break; 923122922Sandre 924122922Sandre if (d->bd_slen == 0) { 9251541Srgrimes BPFD_UNLOCK(d); 926122922Sandre return (0); 9271541Srgrimes } 928213158Slstewart ROTATE_BUFFERS(d); 929252555Snp break; 930252555Snp } 931174757Skmacy } 932252555Snp /* 933252555Snp * At this point, we know we have something in the hold slot. 934252555Snp */ 935174757Skmacy d->bd_hbuf_in_use = 1; 936130989Sps BPFD_UNLOCK(d); 937215166Slstewart 938215166Slstewart /* 939215166Slstewart * Move data from hold buffer into user space. 940215166Slstewart * We know the entire buffer is transferred since 941215166Slstewart * we checked above that the read buffer is bpf_bufsize bytes. 942216758Slstewart * 943216758Slstewart * We do not have to worry about simultaneous reads because 944215166Slstewart * we waited for sole access to the hold buffer above. 94532821Sdg */ 946108265Shsu error = bpf_uiomove(d, d->bd_hbuf, d->bd_hlen, uio); 947190787Szec 948111145Sjlemon BPFD_LOCK(d); 949111145Sjlemon KASSERT(d->bd_hbuf != NULL, ("bpfread: lost bd_hbuf")); 950111145Sjlemon d->bd_fbuf = d->bd_hbuf; 951157430Srwatson d->bd_hbuf = NULL; 952157430Srwatson d->bd_hlen = 0; 953111145Sjlemon bpf_buf_reclaimed(d); 954111145Sjlemon d->bd_hbuf_in_use = 0; 955157431Srwatson wakeup(&d->bd_hbuf_in_use); 956111145Sjlemon BPFD_UNLOCK(d); 957111145Sjlemon 958157376Srwatson return (error); 959111145Sjlemon} 960181803Sbz 961178285Srwatson/* 962138410Srwatson * If there are processes sleeping on this descriptor, wake them up. 963252555Snp */ 964174757Skmacystatic __inline void 965252555Snpbpf_wakeup(struct bpf_d *d) 966252555Snp{ 967158009Srwatson 968190948Srwatson BPFD_LOCK_ASSERT(d); 969157376Srwatson if (d->bd_state == BPF_WAITING) { 970157376Srwatson callout_stop(&d->bd_callout); 971157376Srwatson d->bd_state = BPF_IDLE; 972189848Srwatson } 973157376Srwatson wakeup(d); 974157376Srwatson if (d->bd_async && d->bd_sig && d->bd_sigio) 975189848Srwatson pgsigio(&d->bd_sigio, d->bd_sig, 0); 976178285Srwatson 977157376Srwatson selwakeuppri(&d->bd_sel, PRINET); 978157376Srwatson KNOTE_LOCKED(&d->bd_sel.si_note, 0); 979157376Srwatson} 980157376Srwatson 981157376Srwatsonstatic void 982157376Srwatsonbpf_timed_out(void *arg) 983157376Srwatson{ 9841541Srgrimes struct bpf_d *d = (struct bpf_d *)arg; 9851541Srgrimes 9861541Srgrimes BPFD_LOCK_ASSERT(d); 987157431Srwatson 9881541Srgrimes if (callout_pending(&d->bd_callout) || !callout_active(&d->bd_callout)) 989183550Szec return; 990157431Srwatson if (d->bd_state == BPF_WAITING) { 991183550Szec d->bd_state = BPF_TIMED_OUT; 992183550Szec if (d->bd_slen != 0) 993183550Szec bpf_wakeup(d); 994195760Srwatson } 995183550Szec} 996183550Szec 99755198Smsmithstatic int 99855198Smsmithbpf_ready(struct bpf_d *d) 9991541Srgrimes{ 100055198Smsmith 100155198Smsmith BPFD_LOCK_ASSERT(d); 100255198Smsmith 100355198Smsmith if (!bpf_canfreebuf(d) && d->bd_hlen != 0) 100455198Smsmith return (1); 1005133874Srwatson if ((d->bd_immediate || d->bd_state == BPF_TIMED_OUT) && 1006133874Srwatson d->bd_slen != 0) 100755198Smsmith return (1); 1008181803Sbz return (0); 1009181803Sbz} 1010189848Srwatson 1011111145Sjlemonstatic int 1012178285Srwatsonbpfwrite(struct cdev *dev, struct uio *uio, int ioflag) 1013127870Srwatson{ 1014213158Slstewart struct bpf_d *d; 1015144857Sps struct ifnet *ifp; 101655198Smsmith struct mbuf *m, *mc; 1017178285Srwatson struct sockaddr dst; 101855198Smsmith int error, hlen; 1019181803Sbz 1020183550Szec error = devfs_get_cdevpriv((void **)&d); 102155198Smsmith if (error != 0) 1022195760Srwatson return (error); 10231541Srgrimes 10241541Srgrimes BPF_PID_REFRESH_CUR(d); 10251541Srgrimes d->bd_wcount++; 10261541Srgrimes /* XXX: locking required */ 10271541Srgrimes if (d->bd_bif == NULL) { 10281541Srgrimes d->bd_wdcount++; 102972960Sjlemon return (ENXIO); 103072960Sjlemon } 103172960Sjlemon 10321541Srgrimes ifp = d->bd_bif->bif_ifp; 103398211Shsu 1034157431Srwatson if ((ifp->if_flags & IFF_UP) == 0) { 10351541Srgrimes d->bd_wdcount++; 1036157432Srwatson return (ENETDOWN); 10371541Srgrimes } 1038181803Sbz 1039178285Srwatson if (uio->uio_resid == 0) { 1040157433Srwatson d->bd_wdcount++; 1041189848Srwatson return (0); 1042189848Srwatson } 1043157433Srwatson 1044157433Srwatson bzero(&dst, sizeof(dst)); 1045157432Srwatson m = NULL; 1046157433Srwatson hlen = 0; 1047138410Srwatson /* XXX: bpf_movein() can sleep */ 10481541Srgrimes error = bpf_movein(uio, (int)d->bd_bif->bif_dlt, ifp, 10491541Srgrimes &m, &dst, &hlen, d->bd_wfilter); 10501541Srgrimes if (error) { 10511541Srgrimes d->bd_wdcount++; 10521541Srgrimes return (error); 10531541Srgrimes } 10541541Srgrimes d->bd_wfcount++; 10551541Srgrimes if (d->bd_hdrcmplt) 1056110896Shsu dst.sa_family = pseudo_AF_HDRCMPLT; 1057110896Shsu 1058139222Srwatson if (d->bd_feedback) { 10591541Srgrimes mc = m_dup(m, M_NOWAIT); 106098211Shsu if (mc != NULL) 1061157376Srwatson mc->m_pkthdr.rcvif = ifp; 1062157376Srwatson /* Set M_PROMISC for outgoing packets to be discarded. */ 1063157376Srwatson if (d->bd_direction == BPF_D_INOUT) 1064157376Srwatson m->m_flags |= M_PROMISC; 1065157376Srwatson } else 106698211Shsu mc = NULL; 10671541Srgrimes 1068139222Srwatson m->m_pkthdr.len -= hlen; 106998211Shsu m->m_len -= hlen; 107072960Sjlemon m->m_data += hlen; /* XXX */ 1071111748Sdes 10721541Srgrimes CURVNET_SET(ifp->if_vnet); 10731541Srgrimes#ifdef MAC 107472960Sjlemon BPFD_LOCK(d); 10751541Srgrimes mac_bpfdesc_create_mbuf(d, m); 10761541Srgrimes if (mc != NULL) 107736079Swollman mac_bpfdesc_create_mbuf(d, mc); 107862573Sphk BPFD_UNLOCK(d); 107936079Swollman#endif 1080171605Ssilby 108136079Swollman error = (*ifp->if_output)(ifp, m, &dst, NULL); 108236079Swollman if (error) 108336079Swollman d->bd_wdcount++; 108436079Swollman 108536079Swollman if (mc != NULL) { 108636079Swollman if (error == 0) 108736079Swollman (*ifp->if_input)(ifp, mc); 108836079Swollman else 1089127870Srwatson m_freem(mc); 1090211888Sjhb } 1091211888Sjhb CURVNET_RESTORE(); 1092211888Sjhb 1093139222Srwatson return (error); 109436079Swollman} 109536079Swollman 1096127870Srwatson/* 1097139222Srwatson * Reset a descriptor by flushing its packet buffer and clearing the receive 109836079Swollman * and drop counts. This is doable for kernel-only buffers, but with 109936079Swollman * zero-copy buffers, we can't write to (or rotate) buffers that are 110036079Swollman * currently owned by userspace. It would be nice if we could encapsulate 110136079Swollman * this logic in the buffer code rather than here. 1102181803Sbz */ 1103181803Sbzstatic void 1104181803Sbzreset_d(struct bpf_d *d) 1105181803Sbz{ 110636079Swollman 1107171605Ssilby BPFD_LOCK_ASSERT(d); 1108171605Ssilby 1109126253Struckman while (d->bd_hbuf_in_use) 1110171605Ssilby mtx_sleep(&d->bd_hbuf_in_use, &d->bd_lock, PRINET, 1111126253Struckman "bd_hbuf", 0); 1112126253Struckman if ((d->bd_hbuf != NULL) && 1113100831Struckman (d->bd_bufmode != BPF_BUFMODE_ZBUF || bpf_canfreebuf(d))) { 111436079Swollman /* Free the hold buffer. */ 1115171605Ssilby d->bd_fbuf = d->bd_hbuf; 111636079Swollman d->bd_hbuf = NULL; 111736079Swollman d->bd_hlen = 0; 111836079Swollman bpf_buf_reclaimed(d); 111936079Swollman } 1120139222Srwatson if (bpf_canwritebuf(d)) 112136079Swollman d->bd_slen = 0; 1122171605Ssilby d->bd_rcount = 0; 1123171605Ssilby d->bd_dcount = 0; 1124171605Ssilby d->bd_fcount = 0; 1125171605Ssilby d->bd_wcount = 0; 1126111119Simp d->bd_wfcount = 0; 1127127870Srwatson d->bd_wdcount = 0; 1128139222Srwatson d->bd_zcopy = 0; 1129133874Srwatson} 1130181803Sbz 1131181887Sjulian/* 1132181888Sjulian * FIONREAD Check for read packet available. 1133205251Sbz * SIOCGIFADDR Get interface address - convenient hook to driver. 1134113345Srwatson * BIOCGBLEN Get buffer len [for read()]. 1135113345Srwatson * BIOCSETF Set read filter. 1136113345Srwatson * BIOCSETFNR Set read filter without resetting descriptor. 1137113345Srwatson * BIOCSETWF Set write filter. 1138113345Srwatson * BIOCFLUSH Flush read packet buffer. 1139113345Srwatson * BIOCPROMISC Put interface into promiscuous mode. 1140189848Srwatson * BIOCGDLT Get link layer type. 1141157474Srwatson * BIOCGETIF Get interface name. 1142157474Srwatson * BIOCSETIF Set interface. 1143157474Srwatson * BIOCSRTIMEOUT Set read timeout. 1144157474Srwatson * BIOCGRTIMEOUT Get read timeout. 1145157474Srwatson * BIOCGSTATS Get packet stats. 1146157474Srwatson * BIOCIMMEDIATE Set immediate mode. 1147183982Sbz * BIOCVERSION Get filter language version. 1148205251Sbz * BIOCGHDRCMPLT Get "header already complete" flag 1149205251Sbz * BIOCSHDRCMPLT Set "header already complete" flag 1150113345Srwatson * BIOCGDIRECTION Get packet direction flag 1151205251Sbz * BIOCSDIRECTION Set packet direction flag 1152113345Srwatson * BIOCGTSTAMP Get time stamp format and resolution. 1153205251Sbz * BIOCSTSTAMP Set time stamp format and resolution. 115436079Swollman * BIOCLOCK Set "locked" flag 1155181803Sbz * BIOCFEEDBACK Set packet feedback mode. 115636079Swollman * BIOCSETZBUF Set current zero-copy buffer locations. 115736079Swollman * BIOCGETZMAX Get maximum zero-copy buffer size. 115836079Swollman * BIOCROTZBUF Force rotation of zero-copy buffer 115936079Swollman * BIOCSETBUFMODE Set buffer mode. 116036079Swollman * BIOCGETBUFMODE Get current buffer mode. 1161179414Srwatson */ 116236079Swollman/* ARGSUSED */ 116336079Swollmanstatic int 1164157432Srwatsonbpfioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, 1165145978Scperciva struct thread *td) 1166145978Scperciva{ 116736079Swollman struct bpf_d *d; 116836079Swollman int error; 116936079Swollman 117047960Stegge error = devfs_get_cdevpriv((void **)&d); 1171111145Sjlemon if (error != 0) 1172111145Sjlemon return (error); 1173189848Srwatson 1174111145Sjlemon /* 1175111145Sjlemon * Refresh PID associated with this descriptor. 1176197244Ssilby */ 117747960Stegge BPFD_LOCK(d); 1178197244Ssilby BPF_PID_REFRESH(d, td); 1179197244Ssilby if (d->bd_state == BPF_WAITING) 1180197244Ssilby callout_stop(&d->bd_callout); 1181127870Srwatson d->bd_state = BPF_IDLE; 118236079Swollman BPFD_UNLOCK(d); 1183111145Sjlemon 1184111145Sjlemon if (d->bd_locked == 1) { 1185111145Sjlemon switch (cmd) { 1186111145Sjlemon case BIOCGBLEN: 1187110896Shsu case BIOCFLUSH: 1188179414Srwatson case BIOCGDLT: 118936079Swollman case BIOCGDLTLIST: 1190160491Sups#ifdef COMPAT_FREEBSD32 1191179414Srwatson case BIOCGDLTLIST32: 119236079Swollman#endif 1193205251Sbz case BIOCGETIF: 1194205251Sbz case BIOCGRTIMEOUT: 1195205251Sbz#if defined(COMPAT_FREEBSD32) && !defined(__mips__) 1196222488Srwatson case BIOCGRTIMEOUT32: 1197222488Srwatson#endif 1198222488Srwatson case BIOCGSTATS: 1199205251Sbz case BIOCVERSION: 1200205251Sbz case BIOCGRSIG: 1201205251Sbz case BIOCGHDRCMPLT: 120236079Swollman case BIOCSTSTAMP: 120336079Swollman case BIOCFEEDBACK: 120436079Swollman case FIONREAD: 120536079Swollman case BIOCLOCK: 120636079Swollman case BIOCSRTIMEOUT: 120736079Swollman#if defined(COMPAT_FREEBSD32) && !defined(__mips__) 120836079Swollman case BIOCSRTIMEOUT32: 120936079Swollman#endif 1210181803Sbz case BIOCIMMEDIATE: 1211181803Sbz case TIOCGPGRP: 121236079Swollman case BIOCROTZBUF: 1213181803Sbz break; 1214181803Sbz default: 121536079Swollman return (EPERM); 121636079Swollman } 121736079Swollman } 1218139222Srwatson#ifdef COMPAT_FREEBSD32 121936079Swollman /* 122036079Swollman * If we see a 32-bit compat ioctl, mark the stream as 32-bit so 1221217554Smdf * that it will get 32-bit packet headers. 1222217554Smdf */ 1223167785Sandre switch (cmd) { 122436079Swollman case BIOCSETF32: 1225221250Sbz case BIOCSETFNR32: 122648758Sgreen case BIOCSETWF32: 122762573Sphk case BIOCGDLTLIST32: 122848758Sgreen case BIOCGRTIMEOUT32: 122972650Sgreen case BIOCSRTIMEOUT32: 123048758Sgreen BPFD_LOCK(d); 123148758Sgreen d->bd_compat32 = 1; 1232148156Srwatson BPFD_UNLOCK(d); 123348758Sgreen } 1234170587Srwatson#endif 123548758Sgreen 123648758Sgreen CURVNET_SET(TD_TO_VNET(td)); 123748758Sgreen switch (cmd) { 123848758Sgreen 123948758Sgreen default: 1240222488Srwatson error = EINVAL; 1241222488Srwatson break; 1242179414Srwatson 1243179414Srwatson /* 1244179414Srwatson * Check for read packet available. 1245179414Srwatson */ 1246183982Sbz case FIONREAD: 1247179414Srwatson { 1248183606Sbz int n; 1249179414Srwatson 1250222488Srwatson BPFD_LOCK(d); 125148758Sgreen n = d->bd_slen; 125299838Struckman while (d->bd_hbuf_in_use) 125399838Struckman mtx_sleep(&d->bd_hbuf_in_use, &d->bd_lock, 125448758Sgreen PRINET, "bd_hbuf", 0); 125548758Sgreen if (d->bd_hbuf) 125648758Sgreen n += d->bd_hlen; 125778697Sdwmalone BPFD_UNLOCK(d); 125878697Sdwmalone 125978697Sdwmalone *(int *)addr = n; 1260221250Sbz break; 126148758Sgreen } 126255679Sshin 126355679Sshin case SIOCGIFADDR: 126462573Sphk { 126555679Sshin struct ifnet *ifp; 126672650Sgreen 126755679Sshin if (d->bd_bif == NULL) 126855679Sshin error = EINVAL; 1269221250Sbz else { 1270221250Sbz ifp = d->bd_bif->bif_ifp; 1271221250Sbz error = (*ifp->if_ioctl)(ifp, cmd, addr); 1272221250Sbz } 127355679Sshin break; 1274170587Srwatson } 127555679Sshin 127655679Sshin /* 127755679Sshin * Get buffer len [for read()]. 127855679Sshin */ 127955679Sshin case BIOCGBLEN: 1280181803Sbz BPFD_LOCK(d); 1281181803Sbz *(u_int *)addr = d->bd_bufsize; 1282148385Sume BPFD_UNLOCK(d); 1283148385Sume break; 128455679Sshin 1285221250Sbz /* 128655679Sshin * Set buffer length. 128755679Sshin */ 128855679Sshin case BIOCSBLEN: 1289221250Sbz error = bpf_ioctl_sblen(d, (u_int *)addr); 129055679Sshin break; 129155679Sshin 1292148385Sume /* 1293221250Sbz * Set link layer read filter. 129455679Sshin */ 1295222488Srwatson case BIOCSETF: 129655679Sshin case BIOCSETFNR: 129755679Sshin case BIOCSETWF: 129855679Sshin#ifdef COMPAT_FREEBSD32 1299222488Srwatson case BIOCSETF32: 130055679Sshin case BIOCSETFNR32: 1301221250Sbz case BIOCSETWF32: 1302222488Srwatson#endif 1303151254Sphilip error = bpf_setf(d, (struct bpf_program *)addr, cmd); 1304222488Srwatson break; 1305222488Srwatson 1306179414Srwatson /* 1307179414Srwatson * Flush read packet buffer. 1308179414Srwatson */ 1309179414Srwatson case BIOCFLUSH: 1310183982Sbz BPFD_LOCK(d); 1311179414Srwatson reset_d(d); 1312183606Sbz BPFD_UNLOCK(d); 1313179414Srwatson break; 1314222488Srwatson 131555679Sshin /* 131699838Struckman * Put interface into promiscuous mode. 131799838Struckman */ 131855679Sshin case BIOCPROMISC: 131955679Sshin if (d->bd_bif == NULL) { 132055679Sshin /* 132178697Sdwmalone * No interface attached yet. 132278697Sdwmalone */ 132378697Sdwmalone error = EINVAL; 1324221250Sbz break; 132555679Sshin } 132655679Sshin if (d->bd_promisc == 0) { 1327221250Sbz error = ifpromisc(d->bd_bif->bif_ifp, 1); 13281541Srgrimes if (error == 0) 1329157431Srwatson d->bd_promisc = 1; 13301541Srgrimes } 133172959Sjlemon break; 133272959Sjlemon 133373109Sjlemon /* 133473109Sjlemon * Get current data link type. 133573109Sjlemon */ 133698211Shsu case BIOCGDLT: 1337145360Sandre BPF_LOCK(); 1338145360Sandre if (d->bd_bif == NULL) 1339145360Sandre error = EINVAL; 1340148156Srwatson else 13411541Srgrimes *(u_int *)addr = d->bd_bif->bif_dlt; 134273109Sjlemon BPF_UNLOCK(); 134373109Sjlemon break; 134473109Sjlemon 134573109Sjlemon /* 1346145355Sandre * Get a list of supported data link types. 1347235051Sglebius */ 1348181803Sbz#ifdef COMPAT_FREEBSD32 134999156Sjesper case BIOCGDLTLIST32: 135072959Sjlemon { 1351122922Sandre struct bpf_dltlist32 *list32; 1352122922Sandre struct bpf_dltlist dltlist; 1353122922Sandre 1354122922Sandre list32 = (struct bpf_dltlist32 *)addr; 1355122922Sandre dltlist.bfl_len = list32->bfl_len; 1356122922Sandre dltlist.bfl_list = PTRIN(list32->bfl_list); 1357145355Sandre BPF_LOCK(); 1358145355Sandre if (d->bd_bif == NULL) 1359145355Sandre error = EINVAL; 1360145355Sandre else { 1361145355Sandre error = bpf_getdltlist(d, &dltlist); 1362122922Sandre if (error == 0) 1363122922Sandre list32->bfl_len = dltlist.bfl_len; 1364122922Sandre } 1365122922Sandre BPF_UNLOCK(); 1366122922Sandre break; 1367127870Srwatson } 1368119995Sru#endif 13691541Srgrimes 1370127870Srwatson case BIOCGDLTLIST: 1371145360Sandre BPF_LOCK(); 1372145360Sandre if (d->bd_bif == NULL) 1373133874Srwatson error = EINVAL; 1374105586Sphk else 1375181803Sbz error = bpf_getdltlist(d, (struct bpf_dltlist *)addr); 1376222488Srwatson BPF_UNLOCK(); 1377222488Srwatson break; 137898102Shsu 1379189848Srwatson /* 1380189848Srwatson * Set data link type. 1381157433Srwatson */ 1382145360Sandre case BIOCSDLT: 138398102Shsu BPF_LOCK(); 1384145360Sandre if (d->bd_bif == NULL) 1385145360Sandre error = EINVAL; 1386145360Sandre else 1387145360Sandre error = bpf_setdlt(d, *(u_int *)addr); 1388145360Sandre BPF_UNLOCK(); 1389145360Sandre break; 1390145360Sandre 1391145360Sandre /* 1392145360Sandre * Get interface name. 1393145360Sandre */ 1394145360Sandre case BIOCGETIF: 1395178888Sjulian BPF_LOCK(); 1396178888Sjulian if (d->bd_bif == NULL) 1397145360Sandre error = EINVAL; 1398145360Sandre else { 1399145869Sandre struct ifnet *const ifp = d->bd_bif->bif_ifp; 1400145869Sandre struct ifreq *const ifr = (struct ifreq *)addr; 1401145869Sandre 1402149929Sandre strlcpy(ifr->ifr_name, ifp->if_xname, 1403149929Sandre sizeof(ifr->ifr_name)); 1404145869Sandre } 1405145360Sandre BPF_UNLOCK(); 1406149929Sandre break; 1407145869Sandre 1408211333Sandre /* 1409211333Sandre * Set interface. 1410211333Sandre */ 1411145869Sandre case BIOCSETIF: 1412145869Sandre BPF_LOCK(); 1413218909Sbrucec error = bpf_setif(d, (struct ifreq *)addr); 1414145869Sandre BPF_UNLOCK(); 1415145869Sandre break; 1416145869Sandre 1417145869Sandre /* 1418162084Sandre * Set read timeout. 1419145360Sandre */ 1420235051Sglebius case BIOCSRTIMEOUT: 1421235051Sglebius#if defined(COMPAT_FREEBSD32) && !defined(__mips__) 1422235051Sglebius case BIOCSRTIMEOUT32: 1423235051Sglebius#endif 1424145360Sandre { 142598102Shsu struct timeval *tv = (struct timeval *)addr; 1426127870Srwatson#if defined(COMPAT_FREEBSD32) && !defined(__mips__) 1427178285Srwatson struct timeval32 *tv32; 142886764Sjlemon struct timeval tv64; 1429186222Sbz 143086764Sjlemon if (cmd == BIOCSRTIMEOUT32) { 143186764Sjlemon tv32 = (struct timeval32 *)addr; 143286764Sjlemon tv = &tv64; 143386764Sjlemon tv->tv_sec = tv32->tv_sec; 143486764Sjlemon tv->tv_usec = tv32->tv_usec; 143573109Sjlemon } else 1436181803Sbz#endif 14371541Srgrimes tv = (struct timeval *)addr; 1438181803Sbz 14391541Srgrimes /* 1440221250Sbz * Subtract 1 tick from tvtohz() since this isn't 14411541Srgrimes * a one-shot timer. 144255679Sshin */ 144355679Sshin if ((error = itimerfix(tv)) == 0) 1444157431Srwatson d->bd_rtout = tvtohz(tv) - 1; 144555679Sshin break; 144655679Sshin } 144798211Shsu 144855679Sshin /* 144955679Sshin * Get read timeout. 145078064Sume */ 145178064Sume case BIOCGRTIMEOUT: 145255679Sshin#if defined(COMPAT_FREEBSD32) && !defined(__mips__) 145378064Sume case BIOCGRTIMEOUT32: 145478064Sume#endif 145578064Sume { 145678064Sume struct timeval *tv; 145755679Sshin#if defined(COMPAT_FREEBSD32) && !defined(__mips__) 145855679Sshin struct timeval32 *tv32; 145955679Sshin struct timeval tv64; 146055679Sshin 146155679Sshin if (cmd == BIOCGRTIMEOUT32) 1462145355Sandre tv = &tv64; 1463235051Sglebius else 146455679Sshin#endif 1465119995Sru tv = (struct timeval *)addr; 146655679Sshin 1467145355Sandre tv->tv_sec = d->bd_rtout / hz; 1468145355Sandre tv->tv_usec = (d->bd_rtout % hz) * tick; 1469145355Sandre#if defined(COMPAT_FREEBSD32) && !defined(__mips__) 147055679Sshin if (cmd == BIOCGRTIMEOUT32) { 147155679Sshin tv32 = (struct timeval32 *)addr; 147255679Sshin tv32->tv_sec = tv->tv_sec; 147378064Sume tv32->tv_usec = tv->tv_usec; 147455679Sshin } 147555679Sshin#endif 147655679Sshin 147778064Sume break; 147855679Sshin } 147955679Sshin 148055679Sshin /* 148167456Sitojun * Get packet stats. 148278064Sume */ 148355679Sshin case BIOCGSTATS: 148455679Sshin { 1485127870Srwatson struct bpf_stat *bs = (struct bpf_stat *)addr; 148686764Sjlemon 148755679Sshin /* XXXCSJP overflow */ 148855679Sshin bs->bs_recv = d->bd_rcount; 148955679Sshin bs->bs_drop = d->bd_dcount; 149055679Sshin break; 149155679Sshin } 149267456Sitojun 149378064Sume /* 149467456Sitojun * Set immediate mode. 149567456Sitojun */ 149678064Sume case BIOCIMMEDIATE: 149778064Sume BPFD_LOCK(d); 149878064Sume d->bd_immediate = *(u_int *)addr; 1499181803Sbz BPFD_UNLOCK(d); 150078064Sume break; 1501125776Sume 150286764Sjlemon case BIOCVERSION: 1503186222Sbz { 150486764Sjlemon struct bpf_version *bv = (struct bpf_version *)addr; 150586764Sjlemon 150686764Sjlemon bv->bv_major = BPF_MAJOR_VERSION; 150786764Sjlemon bv->bv_minor = BPF_MINOR_VERSION; 1508186222Sbz break; 1509181803Sbz } 151086764Sjlemon 1511181803Sbz /* 151255679Sshin * Get "header already complete" flag 1513181803Sbz */ 1514125776Sume case BIOCGHDRCMPLT: 151555679Sshin BPFD_LOCK(d); 151655679Sshin *(u_int *)addr = d->bd_hdrcmplt; 151755679Sshin BPFD_UNLOCK(d); 151880428Speter break; 151982122Ssilby 152082122Ssilby /* 152182122Ssilby * Set "header already complete" flag 152282122Ssilby */ 152382122Ssilby case BIOCSHDRCMPLT: 152482122Ssilby BPFD_LOCK(d); 152582122Ssilby d->bd_hdrcmplt = *(u_int *)addr ? 1 : 0; 152694390Ssilby BPFD_UNLOCK(d); 152794390Ssilby break; 152882122Ssilby 152982122Ssilby /* 153082122Ssilby * Get packet direction flag 153182122Ssilby */ 153282122Ssilby case BIOCGDIRECTION: 1533133874Srwatson BPFD_LOCK(d); 153482122Ssilby *(u_int *)addr = d->bd_direction; 153582122Ssilby BPFD_UNLOCK(d); 153682122Ssilby break; 153782122Ssilby 153882122Ssilby /* 153982122Ssilby * Set packet direction flag 154082122Ssilby */ 154182122Ssilby case BIOCSDIRECTION: 1542128452Ssilby { 1543128452Ssilby u_int direction; 1544128452Ssilby 1545128452Ssilby direction = *(u_int *)addr; 1546128452Ssilby switch (direction) { 1547128452Ssilby case BPF_D_IN: 1548128452Ssilby case BPF_D_INOUT: 1549128452Ssilby case BPF_D_OUT: 1550128452Ssilby BPFD_LOCK(d); 1551128452Ssilby d->bd_direction = direction; 1552128452Ssilby BPFD_UNLOCK(d); 1553128452Ssilby break; 155482122Ssilby default: 155582122Ssilby error = EINVAL; 155682122Ssilby } 155782122Ssilby } 1558138018Srwatson break; 1559138018Srwatson 1560138018Srwatson /* 156182122Ssilby * Get packet timestamp format and resolution. 156279413Ssilby */ 156382122Ssilby case BIOCGTSTAMP: 1564128452Ssilby BPFD_LOCK(d); 1565128452Ssilby *(u_int *)addr = d->bd_tstamp; 156679413Ssilby BPFD_UNLOCK(d); 1567215701Sdim break; 1568221690Smav 1569215701Sdim /* 1570215701Sdim * Set packet timestamp format and resolution. 1571215701Sdim */ 157275619Skris case BIOCSTSTAMP: 1573195727Srwatson { 1574221690Smav u_int func; 1575195727Srwatson 1576195727Srwatson func = *(u_int *)addr; 1577195727Srwatson if (BPF_T_VALID(func)) 1578195699Srwatson d->bd_tstamp = func; 157975619Skris else 1580157431Srwatson error = EINVAL; 158175619Skris } 1582186057Sbz break; 158382122Ssilby 158482122Ssilby case BIOCFEEDBACK: 1585221690Smav BPFD_LOCK(d); 158675619Skris d->bd_feedback = *(u_int *)addr; 1587178285Srwatson BPFD_UNLOCK(d); 1588138018Srwatson break; 1589157977Srwatson 159082122Ssilby case BIOCLOCK: 1591181803Sbz BPFD_LOCK(d); 1592181803Sbz d->bd_locked = 1; 159382122Ssilby BPFD_UNLOCK(d); 1594181803Sbz break; 1595181803Sbz 159682122Ssilby case FIONBIO: /* Non-blocking I/O */ 1597133874Srwatson break; 159882122Ssilby 1599186057Sbz case FIOASYNC: /* Send signal on receive packets */ 1600186057Sbz BPFD_LOCK(d); 1601186057Sbz d->bd_async = *(int *)addr; 160282122Ssilby BPFD_UNLOCK(d); 160382122Ssilby break; 1604186057Sbz 160582122Ssilby case FIOSETOWN: 1606186057Sbz /* 160782122Ssilby * XXX: Add some sort of locking here? 160882122Ssilby * fsetown() can sleep. 160982122Ssilby */ 161082122Ssilby error = fsetown(*(int *)addr, &d->bd_sigio); 1611186057Sbz break; 161282122Ssilby 1613186057Sbz case FIOGETOWN: 161482122Ssilby BPFD_LOCK(d); 161582122Ssilby *(int *)addr = fgetown(&d->bd_sigio); 1616186057Sbz BPFD_UNLOCK(d); 1617186057Sbz break; 161882122Ssilby 1619181803Sbz /* This is deprecated, FIOSETOWN should be used instead. */ 1620128452Ssilby case TIOCSPGRP: 1621221690Smav error = fsetown(-(*(int *)addr), &d->bd_sigio); 1622221690Smav break; 1623221690Smav 1624183550Szec /* This is deprecated, FIOGETOWN should be used instead. */ 1625183550Szec case TIOCGPGRP: 1626183550Szec *(int *)addr = -fgetown(&d->bd_sigio); 1627221690Smav break; 1628183550Szec 1629221690Smav case BIOCSRSIG: /* Set receive signal */ 1630190787Szec { 1631221690Smav u_int sig; 1632128452Ssilby 1633128452Ssilby sig = *(u_int *)addr; 1634128452Ssilby 163572959Sjlemon if (sig >= NSIG) 163672959Sjlemon error = EINVAL; 163772959Sjlemon else { 163870103Sphk BPFD_LOCK(d); 163998211Shsu d->bd_sig = sig; 1640157431Srwatson BPFD_UNLOCK(d); 164170103Sphk } 1642157432Srwatson break; 164370103Sphk } 1644181803Sbz case BIOCGRSIG: 1645178285Srwatson BPFD_LOCK(d); 1646157433Srwatson *(u_int *)addr = d->bd_sig; 1647189848Srwatson BPFD_UNLOCK(d); 1648189848Srwatson break; 1649157433Srwatson 1650157433Srwatson case BIOCGETBUFMODE: 1651157432Srwatson BPFD_LOCK(d); 1652157433Srwatson *(u_int *)addr = d->bd_bufmode; 1653157433Srwatson BPFD_UNLOCK(d); 1654146864Srwatson break; 1655157433Srwatson 1656157433Srwatson case BIOCSETBUFMODE: 1657157433Srwatson /* 1658157433Srwatson * Allow the buffering mode to be changed as long as we 1659157433Srwatson * haven't yet committed to a particular mode. Our 166072638Sphk * definition of commitment, for now, is whether or not a 166172638Sphk * buffer has been allocated or an interface attached, since 166272638Sphk * that's the point where things get tricky. 166310881Swollman */ 1664235051Sglebius switch (*(u_int *)addr) { 1665235051Sglebius case BPF_BUFMODE_BUFFER: 166610930Swollman break; 166710881Swollman 1668235051Sglebius case BPF_BUFMODE_ZBUF: 1669235051Sglebius if (bpf_zerocopy_enable) 1670235051Sglebius break; 1671235051Sglebius /* FALLSTHROUGH */ 1672235051Sglebius 1673235051Sglebius default: 1674235051Sglebius CURVNET_RESTORE(); 167598211Shsu return (EINVAL); 1676235051Sglebius } 167710881Swollman 1678157432Srwatson BPFD_LOCK(d); 1679182851Sbz if (d->bd_sbuf != NULL || d->bd_hbuf != NULL || 168010881Swollman d->bd_fbuf != NULL || d->bd_bif != NULL) { 1681178285Srwatson BPFD_UNLOCK(d); 1682189848Srwatson CURVNET_RESTORE(); 1683189848Srwatson return (EBUSY); 1684157433Srwatson } 1685157433Srwatson d->bd_bufmode = *(u_int *)addr; 1686157432Srwatson BPFD_UNLOCK(d); 1687157433Srwatson break; 1688157433Srwatson 1689235051Sglebius case BIOCGETZMAX: 1690182851Sbz error = bpf_ioctl_getzmax(td, d, (size_t *)addr); 1691182851Sbz break; 1692182851Sbz 1693182851Sbz case BIOCSETZBUF: 1694182851Sbz error = bpf_ioctl_setzbuf(td, d, (struct bpf_zbuf *)addr); 1695182851Sbz break; 1696182851Sbz 169755679Sshin case BIOCROTZBUF: 1698190948Srwatson error = bpf_ioctl_rotzbuf(td, d, (struct bpf_zbuf *)addr); 1699157433Srwatson break; 1700157433Srwatson } 1701161645Smohans CURVNET_RESTORE(); 1702161645Smohans return (error); 1703169317Sandre} 1704215166Slstewart 1705252555Snp/* 1706139222Srwatson * Set d's packet filter program to fp. If this file already has a filter, 170710881Swollman * free it and replace it. Returns EINVAL for bogus requests. 170810881Swollman * 1709221250Sbz * Note we need global lock here to serialize bpf_setf() and bpf_setif() calls 171010881Swollman * since reading d->bd_bif can't be protected by d or interface lock due to 17116283Swollman * lock order. 1712184721Sbz * 1713184721Sbz * Additionally, we have to acquire interface write lock due to bpf_mtap() uses 1714184721Sbz * interface read lock to read all filers. 17156283Swollman * 1716133874Srwatson */ 1717252781Sandrestatic int 17186283Swollmanbpf_setf(struct bpf_d *d, struct bpf_program *fp, u_long cmd) 1719122922Sandre{ 1720122922Sandre#ifdef COMPAT_FREEBSD32 1721122922Sandre struct bpf_program fp_swab; 1722122922Sandre struct bpf_program32 *fp32; 17236283Swollman#endif 1724122922Sandre struct bpf_insn *fcode, *old; 1725122922Sandre#ifdef BPF_JITTER 1726122996Sandre bpf_jit_filter *jfunc, *ofunc; 1727122922Sandre#endif 1728122922Sandre size_t size; 1729122922Sandre u_int flen; 1730122922Sandre int need_upgrade; 1731122922Sandre 1732186119Sqingli#ifdef COMPAT_FREEBSD32 17336283Swollman switch (cmd) { 1734122922Sandre case BIOCSETF32: 1735122922Sandre case BIOCSETWF32: 1736122922Sandre case BIOCSETFNR32: 1737122922Sandre fp32 = (struct bpf_program32 *)fp; 1738122922Sandre fp_swab.bf_len = fp32->bf_len; 1739122922Sandre fp_swab.bf_insns = (struct bpf_insn *)(uintptr_t)fp32->bf_insns; 1740162084Sandre fp = &fp_swab; 1741162084Sandre switch (cmd) { 1742252781Sandre case BIOCSETF32: 1743162084Sandre cmd = BIOCSETF; 1744265357Srmacklem break; 1745252781Sandre case BIOCSETWF32: 1746252781Sandre cmd = BIOCSETWF; 1747265357Srmacklem break; 1748162084Sandre } 1749122922Sandre break; 1750122922Sandre } 1751122922Sandre#endif 17526283Swollman 1753221250Sbz fcode = NULL; 17546283Swollman#ifdef BPF_JITTER 175555679Sshin jfunc = ofunc = NULL; 1756122922Sandre#endif 1757252781Sandre need_upgrade = 0; 175855679Sshin 1759122922Sandre /* 1760122922Sandre * Check new filter validness before acquiring any locks. 1761122922Sandre * Allocate memory for new filter, if needed. 176255679Sshin */ 1763122922Sandre flen = fp->bf_len; 1764122922Sandre if (flen > bpf_maxinsns || (fp->bf_insns == NULL && flen != 0)) 1765122996Sandre return (EINVAL); 1766122922Sandre size = flen * sizeof(*fp->bf_insns); 1767122922Sandre if (size > 0) { 1768122922Sandre /* We're setting up new filter. Copy and check actual data. */ 1769122922Sandre fcode = malloc(size, M_BPF, M_WAITOK); 1770232292Sbz if (copyin(fp->bf_insns, fcode, size) != 0 || 177155679Sshin !bpf_validate(fcode, flen)) { 1772122922Sandre free(fcode, M_BPF); 1773122922Sandre return (EINVAL); 1774122922Sandre } 1775122922Sandre#ifdef BPF_JITTER 1776122922Sandre /* Filter is copied inside fcode and is perfectly valid. */ 1777122922Sandre jfunc = bpf_jitter(fcode, flen); 1778122922Sandre#endif 1779162084Sandre } 1780162084Sandre 1781252781Sandre BPF_LOCK(); 1782162084Sandre 1783265357Srmacklem /* 1784252781Sandre * Set up new filter. 1785252781Sandre * Protect filter change by interface lock. 1786265357Srmacklem * Additionally, we are protected by global lock here. 1787162084Sandre */ 1788122922Sandre if (d->bd_bif != NULL) 1789122922Sandre BPFIF_WLOCK(d->bd_bif); 1790122922Sandre BPFD_LOCK(d); 1791122922Sandre if (cmd == BIOCSETWF) { 179255679Sshin old = d->bd_wfilter; 179355679Sshin d->bd_wfilter = fcode; 179455679Sshin } else { 1795171167Sgnn old = d->bd_rfilter; 179655679Sshin d->bd_rfilter = fcode; 179755679Sshin#ifdef BPF_JITTER 1798157431Srwatson ofunc = d->bd_bfilter; 179955679Sshin d->bd_bfilter = jfunc; 180055679Sshin#endif 180155679Sshin if (cmd == BIOCSETF) 180255679Sshin reset_d(d); 180355679Sshin 180455679Sshin if (fcode != NULL) { 180555679Sshin /* 1806111145Sjlemon * Do not require upgrade by first BIOCSETF 180755679Sshin * (used to set snaplen) by pcap_open_live(). 180855679Sshin */ 180978642Ssilby if (d->bd_writer != 0 && --d->bd_writer == 0) 1810139222Srwatson need_upgrade = 1; 1811111119Simp CTR4(KTR_NET, "%s: filter function set by pid %d, " 181255679Sshin "bd_writer counter %d, need_upgrade %d", 1813139222Srwatson __func__, d->bd_pid, d->bd_writer, need_upgrade); 181455679Sshin } 181555679Sshin } 181655679Sshin BPFD_UNLOCK(d); 181755679Sshin if (d->bd_bif != NULL) 181855679Sshin BPFIF_WUNLOCK(d->bd_bif); 181955679Sshin if (old != NULL) 182055679Sshin free(old, M_BPF); 1821111144Sjlemon#ifdef BPF_JITTER 1822188306Sbz if (ofunc != NULL) 182355679Sshin bpf_destroy_jit_filter(ofunc); 182455679Sshin#endif 1825133874Srwatson 1826133874Srwatson /* Move d to active readers list. */ 1827133874Srwatson if (need_upgrade) 1828133874Srwatson bpf_upgraded(d); 1829133874Srwatson 1830188306Sbz BPF_UNLOCK(); 1831133874Srwatson return (0); 183255679Sshin} 183355679Sshin 1834139222Srwatson/* 183555679Sshin * Detach a file from its current interface (if attached at all) and attach 1836171167Sgnn * to the interface indicated by the name stored in ifr. 183755679Sshin * Return an errno or 0. 1838125680Sbms */ 1839125680Sbmsstatic int 1840125783Sbmsbpf_setif(struct bpf_d *d, struct ifreq *ifr) 1841125783Sbms{ 1842125783Sbms struct bpf_if *bp; 1843125783Sbms struct ifnet *theywant; 1844125783Sbms 1845125783Sbms BPF_LOCK_ASSERT(); 1846125783Sbms 1847125819Sbms theywant = ifunit(ifr->ifr_name); 1848125783Sbms if (theywant == NULL || theywant->if_bpf == NULL) 1849125783Sbms return (ENXIO); 1850125783Sbms 1851125783Sbms bp = theywant->if_bpf; 1852183001Sbz 1853125680Sbms /* Check if interface is not being detached from BPF */ 1854125741Sbms BPFIF_RLOCK(bp); 1855125741Sbms if (bp->flags & BPFIF_FLAG_DYING) { 1856183001Sbz BPFIF_RUNLOCK(bp); 1857125741Sbms return (ENXIO); 1858125741Sbms } 1859125741Sbms BPFIF_RUNLOCK(bp); 1860125741Sbms 1861125741Sbms /* 1862125680Sbms * Behavior here depends on the buffering model. If we're using 1863125680Sbms * kernel memory buffers, then we can allocate them here. If we're 1864125680Sbms * using zero-copy, then the user process must have registered 1865125680Sbms * buffers by the time we get here. If not, return an error. 1866125680Sbms */ 1867125680Sbms switch (d->bd_bufmode) { 1868125680Sbms case BPF_BUFMODE_BUFFER: 1869125680Sbms case BPF_BUFMODE_ZBUF: 1870125680Sbms if (d->bd_sbuf == NULL) 1871125680Sbms return (EINVAL); 1872125680Sbms break; 1873125680Sbms 1874125680Sbms default: 1875183001Sbz panic("bpf_setif: bufmode %d", d->bd_bufmode); 1876125741Sbms } 1877125680Sbms if (bp != d->bd_bif) 1878125680Sbms bpf_attachd(d, bp); 1879221250Sbz BPFD_LOCK(d); 1880125680Sbms reset_d(d); 1881221250Sbz BPFD_UNLOCK(d); 1882125680Sbms return (0); 1883125680Sbms} 1884125680Sbms 1885221250Sbz/* 1886125680Sbms * Support for select() and poll() system calls 1887221250Sbz * 1888125680Sbms * Return true iff the specific operation will not block indefinitely. 1889125680Sbms * Otherwise, return false but make a note that a selwakeup() must be done. 1890183001Sbz */ 1891183001Sbzstatic int 1892183001Sbzbpfpoll(struct cdev *dev, int events, struct thread *td) 1893183001Sbz{ 1894183001Sbz struct bpf_d *d; 1895183001Sbz int revents; 1896183001Sbz 1897125680Sbms if (devfs_get_cdevpriv((void **)&d) != 0 || d->bd_bif == NULL) 1898125680Sbms return (events & 1899125741Sbms (POLLHUP|POLLIN|POLLRDNORM|POLLOUT|POLLWRNORM)); 1900125741Sbms 1901125741Sbms /* 1902125741Sbms * Refresh PID associated with this descriptor. 1903183001Sbz */ 1904125680Sbms revents = events & (POLLOUT | POLLWRNORM); 1905183001Sbz BPFD_LOCK(d); 1906183001Sbz BPF_PID_REFRESH(d, td); 1907183001Sbz if (events & (POLLIN | POLLRDNORM)) { 1908183001Sbz if (bpf_ready(d)) 1909221250Sbz revents |= events & (POLLIN | POLLRDNORM); 1910183001Sbz else { 1911183001Sbz selrecord(td, &d->bd_sel); 1912183001Sbz /* Start the read timeout if necessary. */ 1913183001Sbz if (d->bd_rtout > 0 && d->bd_state == BPF_IDLE) { 1914183001Sbz callout_reset(&d->bd_callout, d->bd_rtout, 1915183001Sbz bpf_timed_out, d); 1916221250Sbz d->bd_state = BPF_WAITING; 1917183001Sbz } 1918183001Sbz } 1919183001Sbz } 1920183001Sbz BPFD_UNLOCK(d); 1921183001Sbz return (revents); 1922183001Sbz} 1923183001Sbz 1924183001Sbz/* 1925183001Sbz * Support for kevent() system call. Register EVFILT_READ filters and 1926183001Sbz * reject all others. 1927183001Sbz */ 1928183001Sbzint 1929183001Sbzbpfkqfilter(struct cdev *dev, struct knote *kn) 1930183001Sbz{ 1931125741Sbms struct bpf_d *d; 1932125741Sbms 1933125680Sbms if (devfs_get_cdevpriv((void **)&d) != 0 || 1934125680Sbms kn->kn_filter != EVFILT_READ) 1935183001Sbz return (1); 1936183001Sbz 1937183001Sbz /* 1938183001Sbz * Refresh PID associated with this descriptor. 1939183001Sbz */ 1940183001Sbz BPFD_LOCK(d); 1941183001Sbz BPF_PID_REFRESH_CUR(d); 1942125680Sbms kn->kn_fop = &bpfread_filtops; 1943125680Sbms kn->kn_hook = d; 1944125741Sbms knlist_add(&d->bd_sel.si_note, kn, 1); 1945125680Sbms BPFD_UNLOCK(d); 1946125680Sbms 1947183001Sbz return (0); 1948125680Sbms} 1949125680Sbms 1950125680Sbmsstatic void 1951125680Sbmsfilt_bpfdetach(struct knote *kn) 1952125680Sbms{ 1953125680Sbms struct bpf_d *d = (struct bpf_d *)kn->kn_hook; 1954125680Sbms 1955183001Sbz knlist_remove(&d->bd_sel.si_note, kn, 0); 1956221250Sbz} 1957183001Sbz 1958183001Sbzstatic int 1959183001Sbzfilt_bpfread(struct knote *kn, long hint) 1960183001Sbz{ 1961183001Sbz struct bpf_d *d = (struct bpf_d *)kn->kn_hook; 1962183001Sbz int ready; 1963183001Sbz 1964183001Sbz BPFD_LOCK_ASSERT(d); 1965183001Sbz ready = bpf_ready(d); 1966125741Sbms if (ready) { 1967183001Sbz kn->kn_data = d->bd_slen; 1968183001Sbz while (d->bd_hbuf_in_use) 1969183001Sbz mtx_sleep(&d->bd_hbuf_in_use, &d->bd_lock, 1970221250Sbz PRINET, "bd_hbuf", 0); 1971183001Sbz if (d->bd_hbuf) 1972125680Sbms kn->kn_data += d->bd_hlen; 1973183001Sbz } else if (d->bd_rtout > 0 && d->bd_state == BPF_IDLE) { 1974183001Sbz callout_reset(&d->bd_callout, d->bd_rtout, 1975183001Sbz bpf_timed_out, d); 1976183001Sbz d->bd_state = BPF_WAITING; 1977183001Sbz } 1978183001Sbz 1979183001Sbz return (ready); 1980183001Sbz} 1981183001Sbz 1982183001Sbz#define BPF_TSTAMP_NONE 0 1983183001Sbz#define BPF_TSTAMP_FAST 1 1984183001Sbz#define BPF_TSTAMP_NORMAL 2 1985183001Sbz#define BPF_TSTAMP_EXTERN 3 1986183001Sbz 1987183001Sbzstatic int 1988183001Sbzbpf_ts_quality(int tstype) 1989183001Sbz{ 1990183001Sbz 1991183001Sbz if (tstype == BPF_T_NONE) 1992183001Sbz return (BPF_TSTAMP_NONE); 1993183001Sbz if ((tstype & BPF_T_FAST) != 0) 1994183001Sbz return (BPF_TSTAMP_FAST); 1995183001Sbz 1996183001Sbz return (BPF_TSTAMP_NORMAL); 1997183001Sbz} 1998183001Sbz 1999183001Sbzstatic int 2000183001Sbzbpf_gettime(struct bintime *bt, int tstype, struct mbuf *m) 2001183001Sbz{ 2002183001Sbz struct m_tag *tag; 2003183001Sbz int quality; 2004183001Sbz 2005183001Sbz quality = bpf_ts_quality(tstype); 2006183001Sbz if (quality == BPF_TSTAMP_NONE) 2007183001Sbz return (quality); 2008125680Sbms 2009125680Sbms if (m != NULL) { 2010125680Sbms tag = m_tag_locate(m, MTAG_BPF, MTAG_BPF_TIMESTAMP, NULL); 2011125680Sbms if (tag != NULL) { 2012125680Sbms *bt = *(struct bintime *)(tag + 1); 2013125680Sbms return (BPF_TSTAMP_EXTERN); 2014125680Sbms } 2015125741Sbms } 2016125680Sbms if (quality == BPF_TSTAMP_NORMAL) 2017125680Sbms binuptime(bt); 2018125680Sbms else 2019125680Sbms getbinuptime(bt); 2020125680Sbms 2021125783Sbms return (quality); 2022125741Sbms} 2023125680Sbms 2024125680Sbms/* 2025125680Sbms * Incoming linkage from device drivers. Process the packet pkt, of length 2026174022Sbz * pktlen, which is stored in a contiguous buffer. The packet is parsed 2027125680Sbms * by each process' filter, and if accepted, stashed into the corresponding 2028125741Sbms * buffer. 2029125680Sbms */ 2030125680Sbmsvoid 2031125680Sbmsbpf_tap(struct bpf_if *bp, u_char *pkt, u_int pktlen) 2032125680Sbms{ 2033221023Sattilio struct bintime bt; 2034221023Sattilio struct bpf_d *d; 2035221023Sattilio#ifdef BPF_JITTER 2036221023Sattilio bpf_jit_filter *bf; 2037221023Sattilio#endif 2038221023Sattilio u_int slen; 2039221023Sattilio int gottime; 2040221023Sattilio 2041221023Sattilio gottime = BPF_TSTAMP_NONE; 2042221023Sattilio 2043221023Sattilio BPFIF_RLOCK(bp); 2044221023Sattilio 2045221023Sattilio LIST_FOREACH(d, &bp->bif_dlist, bd_next) { 2046221023Sattilio /* 2047221023Sattilio * We are not using any locks for d here because: 2048221023Sattilio * 1) any filter change is protected by interface 2049221023Sattilio * write lock 2050221023Sattilio * 2) destroying/detaching d is protected by interface 2051221023Sattilio * write lock, too 2052221023Sattilio */ 2053221023Sattilio 2054221023Sattilio /* XXX: Do not protect counter for the sake of performance. */ 2055221023Sattilio ++d->bd_rcount; 2056221023Sattilio /* 2057221023Sattilio * NB: We dont call BPF_CHECK_DIRECTION() here since there is no 2058221023Sattilio * way for the caller to indiciate to us whether this packet 2059221023Sattilio * is inbound or outbound. In the bpf_mtap() routines, we use 2060221023Sattilio * the interface pointers on the mbuf to figure it out. 2061221023Sattilio */ 2062221023Sattilio#ifdef BPF_JITTER 2063221023Sattilio bf = bpf_jitter_enable != 0 ? d->bd_bfilter : NULL; 2064221023Sattilio if (bf != NULL) 2065221023Sattilio slen = (*(bf->func))(pkt, pktlen, pktlen); 2066221023Sattilio else 2067221023Sattilio#endif 2068221023Sattilio slen = bpf_filter(d->bd_rfilter, pkt, pktlen, pktlen); 2069221023Sattilio if (slen != 0) { 2070221023Sattilio /* 2071221023Sattilio * Filter matches. Let's to acquire write lock. 2072221023Sattilio */ 2073221023Sattilio BPFD_LOCK(d); 2074221023Sattilio 2075221023Sattilio d->bd_fcount++; 2076221023Sattilio if (gottime < bpf_ts_quality(d->bd_tstamp)) 2077221023Sattilio gottime = bpf_gettime(&bt, d->bd_tstamp, NULL); 2078221023Sattilio#ifdef MAC 2079221023Sattilio if (mac_bpfdesc_check_receive(d, bp->bif_ifp) == 0) 2080221023Sattilio#endif 2081221023Sattilio catchpacket(d, pkt, pktlen, slen, 2082221023Sattilio bpf_append_bytes, &bt); 2083221023Sattilio BPFD_UNLOCK(d); 2084221023Sattilio } 2085221023Sattilio } 2086221023Sattilio BPFIF_RUNLOCK(bp); 2087221023Sattilio} 2088221023Sattilio 2089221023Sattilio#define BPF_CHECK_DIRECTION(d, r, i) \ 2090221023Sattilio (((d)->bd_direction == BPF_D_IN && (r) != (i)) || \ 2091221023Sattilio ((d)->bd_direction == BPF_D_OUT && (r) == (i))) 2092221023Sattilio 2093125680Sbms/* 2094141886Smaxim * Incoming linkage from device drivers, when packet is in an mbuf chain. 2095141886Smaxim * Locking model is explained in bpf_tap(). 2096141886Smaxim */ 2097141886Smaximvoid 2098141886Smaximbpf_mtap(struct bpf_if *bp, struct mbuf *m) 2099141886Smaxim{ 2100141886Smaxim struct bintime bt; 2101141886Smaxim struct bpf_d *d; 2102150804Smaxim#ifdef BPF_JITTER 2103141886Smaxim bpf_jit_filter *bf; 2104141886Smaxim#endif 2105141886Smaxim u_int pktlen, slen; 2106141886Smaxim int gottime; 2107141886Smaxim 2108141886Smaxim /* Skip outgoing duplicate packets. */ 2109141886Smaxim if ((m->m_flags & M_PROMISC) != 0 && m->m_pkthdr.rcvif == NULL) { 2110141886Smaxim m->m_flags &= ~M_PROMISC; 2111141886Smaxim return; 2112141886Smaxim } 2113141886Smaxim 2114141886Smaxim pktlen = m_length(m, NULL); 2115141886Smaxim gottime = BPF_TSTAMP_NONE; 2116141886Smaxim 2117141886Smaxim BPFIF_RLOCK(bp); 2118141886Smaxim 2119141886Smaxim LIST_FOREACH(d, &bp->bif_dlist, bd_next) { 2120141886Smaxim if (BPF_CHECK_DIRECTION(d, m->m_pkthdr.rcvif, bp->bif_ifp)) 2121141886Smaxim continue; 2122141886Smaxim ++d->bd_rcount; 2123141886Smaxim#ifdef BPF_JITTER 2124141886Smaxim bf = bpf_jitter_enable != 0 ? d->bd_bfilter : NULL; 2125141886Smaxim /* XXX We cannot handle multiple mbufs. */ 2126141886Smaxim if (bf != NULL && m->m_next == NULL) 2127141886Smaxim slen = (*(bf->func))(mtod(m, u_char *), pktlen, pktlen); 2128141886Smaxim else 2129141886Smaxim#endif 2130141886Smaxim slen = bpf_filter(d->bd_rfilter, (u_char *)m, pktlen, 0); 2131141886Smaxim if (slen != 0) { 2132141886Smaxim BPFD_LOCK(d); 2133141886Smaxim 2134141886Smaxim d->bd_fcount++; 2135141886Smaxim if (gottime < bpf_ts_quality(d->bd_tstamp)) 2136141886Smaxim gottime = bpf_gettime(&bt, d->bd_tstamp, m); 2137141886Smaxim#ifdef MAC 2138141886Smaxim if (mac_bpfdesc_check_receive(d, bp->bif_ifp) == 0) 2139141886Smaxim#endif 2140141886Smaxim catchpacket(d, (u_char *)m, pktlen, slen, 2141141886Smaxim bpf_append_mbuf, &bt); 2142141886Smaxim BPFD_UNLOCK(d); 2143181803Sbz } 2144141886Smaxim } 2145148385Sume BPFIF_RUNLOCK(bp); 2146181803Sbz} 2147148616Sume 2148148385Sume/* 2149141886Smaxim * Incoming linkage from device drivers, when packet is in 2150141886Smaxim * an mbuf chain and to be prepended by a contiguous header. 2151221250Sbz */ 2152141886Smaximvoid 2153141886Smaximbpf_mtap2(struct bpf_if *bp, void *data, u_int dlen, struct mbuf *m) 2154141886Smaxim{ 2155141886Smaxim struct bintime bt; 2156141886Smaxim struct mbuf mb; 2157141886Smaxim struct bpf_d *d; 2158141886Smaxim u_int pktlen, slen; 2159221250Sbz int gottime; 2160141886Smaxim 2161141886Smaxim /* Skip outgoing duplicate packets. */ 2162141886Smaxim if ((m->m_flags & M_PROMISC) != 0 && m->m_pkthdr.rcvif == NULL) { 2163181803Sbz m->m_flags &= ~M_PROMISC; 2164141886Smaxim return; 2165141886Smaxim } 2166141886Smaxim 2167222488Srwatson pktlen = m_length(m, NULL); 2168222488Srwatson /* 2169222488Srwatson * Craft on-stack mbuf suitable for passing to bpf_filter. 2170141886Smaxim * Note that we cut corners here; we only setup what's 2171141886Smaxim * absolutely needed--this mbuf should never go anywhere else. 2172221250Sbz */ 2173141886Smaxim mb.m_next = m; 2174222488Srwatson mb.m_data = data; 2175222488Srwatson mb.m_len = dlen; 2176141886Smaxim pktlen += dlen; 2177221250Sbz 2178141886Smaxim gottime = BPF_TSTAMP_NONE; 2179141886Smaxim 2180189848Srwatson BPFIF_RLOCK(bp); 2181157474Srwatson 2182157474Srwatson LIST_FOREACH(d, &bp->bif_dlist, bd_next) { 2183157474Srwatson if (BPF_CHECK_DIRECTION(d, m->m_pkthdr.rcvif, bp->bif_ifp)) 2184157474Srwatson continue; 2185157474Srwatson ++d->bd_rcount; 2186157474Srwatson slen = bpf_filter(d->bd_rfilter, (u_char *)&mb, pktlen, 0); 2187157427Srwatson if (slen != 0) { 2188157474Srwatson BPFD_LOCK(d); 2189157474Srwatson 2190173884Srwatson d->bd_fcount++; 2191178285Srwatson if (gottime < bpf_ts_quality(d->bd_tstamp)) 2192189848Srwatson gottime = bpf_gettime(&bt, d->bd_tstamp, m); 2193157427Srwatson#ifdef MAC 2194157427Srwatson if (mac_bpfdesc_check_receive(d, bp->bif_ifp) == 0) 2195173884Srwatson#endif 2196173884Srwatson catchpacket(d, (u_char *)&mb, pktlen, slen, 2197178285Srwatson bpf_append_mbuf, &bt); 2198173884Srwatson BPFD_UNLOCK(d); 2199178285Srwatson } 2200141886Smaxim } 2201141886Smaxim BPFIF_RUNLOCK(bp); 2202181803Sbz} 2203141886Smaxim 2204141886Smaxim#undef BPF_CHECK_DIRECTION 2205141886Smaxim 2206250744Szec#undef BPF_TSTAMP_NONE 2207141886Smaxim#undef BPF_TSTAMP_FAST 2208141886Smaxim#undef BPF_TSTAMP_NORMAL 2209169683Sandre#undef BPF_TSTAMP_EXTERN 2210169683Sandre 2211169683Sandrestatic int 2212169683Sandrebpf_hdrlen(struct bpf_d *d) 2213169683Sandre{ 2214169683Sandre int hdrlen; 2215169683Sandre 2216169683Sandre hdrlen = d->bd_bif->bif_hdrlen; 2217169683Sandre#ifndef BURN_BRIDGES 2218169683Sandre if (d->bd_tstamp == BPF_T_NONE || 2219169683Sandre BPF_T_FORMAT(d->bd_tstamp) == BPF_T_MICROTIME) 2220169683Sandre#ifdef COMPAT_FREEBSD32 2221169683Sandre if (d->bd_compat32) 2222211462Sandre hdrlen += SIZEOF_BPF_HDR(struct bpf_hdr32); 2223211462Sandre else 2224211462Sandre#endif 2225211462Sandre hdrlen += SIZEOF_BPF_HDR(struct bpf_hdr); 2226211462Sandre else 2227211462Sandre#endif 2228211462Sandre hdrlen += SIZEOF_BPF_HDR(struct bpf_xhdr); 2229211462Sandre#ifdef COMPAT_FREEBSD32 2230211462Sandre if (d->bd_compat32) 2231211462Sandre hdrlen = BPF_WORDALIGN32(hdrlen); 2232211462Sandre else 2233211462Sandre#endif 2234169683Sandre hdrlen = BPF_WORDALIGN(hdrlen); 2235171229Speter 2236169683Sandre return (hdrlen - d->bd_bif->bif_hdrlen); 2237211462Sandre} 2238211462Sandre 2239211462Sandrestatic void 2240211462Sandrebpf_bintime2ts(struct bintime *bt, struct bpf_ts *ts, int tstype) 2241211462Sandre{ 2242211462Sandre struct bintime bt2; 2243211462Sandre struct timeval tsm; 2244211462Sandre struct timespec tsn; 2245211462Sandre 2246211462Sandre if ((tstype & BPF_T_MONOTONIC) == 0) { 2247211462Sandre bt2 = *bt; 2248211462Sandre bintime_add(&bt2, &boottimebin); 2249169683Sandre bt = &bt2; 2250169683Sandre } 2251169683Sandre switch (BPF_T_FORMAT(tstype)) { 2252169683Sandre case BPF_T_MICROTIME: 2253171230Speter bintime2timeval(bt, &tsm); 2254169683Sandre ts->bt_sec = tsm.tv_sec; 2255171230Speter ts->bt_frac = tsm.tv_usec; 2256169683Sandre break; 2257169683Sandre case BPF_T_NANOTIME: 2258169683Sandre bintime2timespec(bt, &tsn); 2259169683Sandre ts->bt_sec = tsn.tv_sec; 2260169913Sandre ts->bt_frac = tsn.tv_nsec; 2261169913Sandre break; 2262169683Sandre case BPF_T_BINTIME: 2263169913Sandre ts->bt_sec = bt->sec; 2264169913Sandre ts->bt_frac = bt->frac; 2265169683Sandre break; 2266169913Sandre } 2267169683Sandre} 2268169913Sandre 2269169683Sandre/* 2270169683Sandre * Move the packet data from interface memory (pkt) into the 2271170019Srwatson * store buffer. "cpfn" is the routine called to do the actual data 2272169683Sandre * transfer. bcopy is passed in to copy contiguous chunks, while 2273169683Sandre * bpf_append_mbuf is passed in to copy mbuf chains. In the latter case, 2274169683Sandre * pkt is really an mbuf. 2275169683Sandre */ 2276169683Sandrestatic void 2277169683Sandrecatchpacket(struct bpf_d *d, u_char *pkt, u_int pktlen, u_int snaplen, 2278186222Sbz void (*cpfn)(struct bpf_d *, caddr_t, u_int, void *, u_int), 2279169683Sandre struct bintime *bt) 2280169683Sandre{ 2281169683Sandre struct bpf_xhdr hdr; 2282169683Sandre#ifndef BURN_BRIDGES 2283169683Sandre struct bpf_hdr hdr_old; 2284169683Sandre#ifdef COMPAT_FREEBSD32 2285169683Sandre struct bpf_hdr32 hdr32_old; 2286169683Sandre#endif 2287169683Sandre#endif 2288169683Sandre int caplen, curlen, hdrlen, totlen; 2289169683Sandre int do_wakeup = 0; 2290169683Sandre int do_timestamp; 2291169683Sandre int tstype; 2292169683Sandre 2293169683Sandre BPFD_LOCK_ASSERT(d); 2294169683Sandre 2295169683Sandre /* 2296169683Sandre * Detect whether user space has released a buffer back to us, and if 2297169683Sandre * so, move it from being a hold buffer to a free buffer. This may 2298169683Sandre * not be the best place to do it (for example, we might only want to 2299169683Sandre * run this check if we need the space), but for now it's a reliable 2300169683Sandre * spot to do it. 2301169683Sandre */ 2302169683Sandre if (d->bd_fbuf == NULL && bpf_canfreebuf(d)) { 2303169683Sandre while (d->bd_hbuf_in_use) 2304221250Sbz mtx_sleep(&d->bd_hbuf_in_use, &d->bd_lock, 2305169683Sandre PRINET, "bd_hbuf", 0); 2306169683Sandre d->bd_fbuf = d->bd_hbuf; 2307169683Sandre d->bd_hbuf = NULL; 2308169683Sandre d->bd_hlen = 0; 2309169683Sandre bpf_buf_reclaimed(d); 2310169683Sandre } 2311169683Sandre 2312169683Sandre /* 2313221250Sbz * Figure out how many bytes to move. If the packet is 2314169683Sandre * greater or equal to the snapshot length, transfer that 2315169683Sandre * much. Otherwise, transfer the whole packet (unless 2316169683Sandre * we hit the buffer size limit). 2317169683Sandre */ 2318169683Sandre hdrlen = bpf_hdrlen(d); 2319169683Sandre totlen = hdrlen + min(snaplen, pktlen); 2320169683Sandre if (totlen > d->bd_bufsize) 2321169913Sandre totlen = d->bd_bufsize; 2322169683Sandre 2323169683Sandre /* 2324169683Sandre * Round up the end of the previous packet to the next longword. 2325 * 2326 * Drop the packet if there's no room and no hope of room 2327 * If the packet would overflow the storage buffer or the storage 2328 * buffer is considered immutable by the buffer model, try to rotate 2329 * the buffer and wakeup pending processes. 2330 */ 2331#ifdef COMPAT_FREEBSD32 2332 if (d->bd_compat32) 2333 curlen = BPF_WORDALIGN32(d->bd_slen); 2334 else 2335#endif 2336 curlen = BPF_WORDALIGN(d->bd_slen); 2337 if (curlen + totlen > d->bd_bufsize || !bpf_canwritebuf(d)) { 2338 if (d->bd_fbuf == NULL) { 2339 /* 2340 * There's no room in the store buffer, and no 2341 * prospect of room, so drop the packet. Notify the 2342 * buffer model. 2343 */ 2344 bpf_buffull(d); 2345 ++d->bd_dcount; 2346 return; 2347 } 2348 while (d->bd_hbuf_in_use) 2349 mtx_sleep(&d->bd_hbuf_in_use, &d->bd_lock, 2350 PRINET, "bd_hbuf", 0); 2351 ROTATE_BUFFERS(d); 2352 do_wakeup = 1; 2353 curlen = 0; 2354 } else if (d->bd_immediate || d->bd_state == BPF_TIMED_OUT) 2355 /* 2356 * Immediate mode is set, or the read timeout has already 2357 * expired during a select call. A packet arrived, so the 2358 * reader should be woken up. 2359 */ 2360 do_wakeup = 1; 2361 caplen = totlen - hdrlen; 2362 tstype = d->bd_tstamp; 2363 do_timestamp = tstype != BPF_T_NONE; 2364#ifndef BURN_BRIDGES 2365 if (tstype == BPF_T_NONE || BPF_T_FORMAT(tstype) == BPF_T_MICROTIME) { 2366 struct bpf_ts ts; 2367 if (do_timestamp) 2368 bpf_bintime2ts(bt, &ts, tstype); 2369#ifdef COMPAT_FREEBSD32 2370 if (d->bd_compat32) { 2371 bzero(&hdr32_old, sizeof(hdr32_old)); 2372 if (do_timestamp) { 2373 hdr32_old.bh_tstamp.tv_sec = ts.bt_sec; 2374 hdr32_old.bh_tstamp.tv_usec = ts.bt_frac; 2375 } 2376 hdr32_old.bh_datalen = pktlen; 2377 hdr32_old.bh_hdrlen = hdrlen; 2378 hdr32_old.bh_caplen = caplen; 2379 bpf_append_bytes(d, d->bd_sbuf, curlen, &hdr32_old, 2380 sizeof(hdr32_old)); 2381 goto copy; 2382 } 2383#endif 2384 bzero(&hdr_old, sizeof(hdr_old)); 2385 if (do_timestamp) { 2386 hdr_old.bh_tstamp.tv_sec = ts.bt_sec; 2387 hdr_old.bh_tstamp.tv_usec = ts.bt_frac; 2388 } 2389 hdr_old.bh_datalen = pktlen; 2390 hdr_old.bh_hdrlen = hdrlen; 2391 hdr_old.bh_caplen = caplen; 2392 bpf_append_bytes(d, d->bd_sbuf, curlen, &hdr_old, 2393 sizeof(hdr_old)); 2394 goto copy; 2395 } 2396#endif 2397 2398 /* 2399 * Append the bpf header. Note we append the actual header size, but 2400 * move forward the length of the header plus padding. 2401 */ 2402 bzero(&hdr, sizeof(hdr)); 2403 if (do_timestamp) 2404 bpf_bintime2ts(bt, &hdr.bh_tstamp, tstype); 2405 hdr.bh_datalen = pktlen; 2406 hdr.bh_hdrlen = hdrlen; 2407 hdr.bh_caplen = caplen; 2408 bpf_append_bytes(d, d->bd_sbuf, curlen, &hdr, sizeof(hdr)); 2409 2410 /* 2411 * Copy the packet data into the store buffer and update its length. 2412 */ 2413#ifndef BURN_BRIDGES 2414copy: 2415#endif 2416 (*cpfn)(d, d->bd_sbuf, curlen + hdrlen, pkt, caplen); 2417 d->bd_slen = curlen + totlen; 2418 2419 if (do_wakeup) 2420 bpf_wakeup(d); 2421} 2422 2423/* 2424 * Free buffers currently in use by a descriptor. 2425 * Called on close. 2426 */ 2427static void 2428bpf_freed(struct bpf_d *d) 2429{ 2430 2431 /* 2432 * We don't need to lock out interrupts since this descriptor has 2433 * been detached from its interface and it yet hasn't been marked 2434 * free. 2435 */ 2436 bpf_free(d); 2437 if (d->bd_rfilter != NULL) { 2438 free((caddr_t)d->bd_rfilter, M_BPF); 2439#ifdef BPF_JITTER 2440 if (d->bd_bfilter != NULL) 2441 bpf_destroy_jit_filter(d->bd_bfilter); 2442#endif 2443 } 2444 if (d->bd_wfilter != NULL) 2445 free((caddr_t)d->bd_wfilter, M_BPF); 2446 mtx_destroy(&d->bd_lock); 2447} 2448 2449/* 2450 * Attach an interface to bpf. dlt is the link layer type; hdrlen is the 2451 * fixed size of the link header (variable length headers not yet supported). 2452 */ 2453void 2454bpfattach(struct ifnet *ifp, u_int dlt, u_int hdrlen) 2455{ 2456 2457 bpfattach2(ifp, dlt, hdrlen, &ifp->if_bpf); 2458} 2459 2460/* 2461 * Attach an interface to bpf. ifp is a pointer to the structure 2462 * defining the interface to be attached, dlt is the link layer type, 2463 * and hdrlen is the fixed size of the link header (variable length 2464 * headers are not yet supporrted). 2465 */ 2466void 2467bpfattach2(struct ifnet *ifp, u_int dlt, u_int hdrlen, struct bpf_if **driverp) 2468{ 2469 struct bpf_if *bp; 2470 2471 bp = malloc(sizeof(*bp), M_BPF, M_NOWAIT | M_ZERO); 2472 if (bp == NULL) 2473 panic("bpfattach"); 2474 2475 LIST_INIT(&bp->bif_dlist); 2476 LIST_INIT(&bp->bif_wlist); 2477 bp->bif_ifp = ifp; 2478 bp->bif_dlt = dlt; 2479 rw_init(&bp->bif_lock, "bpf interface lock"); 2480 KASSERT(*driverp == NULL, ("bpfattach2: driverp already initialized")); 2481 *driverp = bp; 2482 2483 BPF_LOCK(); 2484 LIST_INSERT_HEAD(&bpf_iflist, bp, bif_next); 2485 BPF_UNLOCK(); 2486 2487 bp->bif_hdrlen = hdrlen; 2488 2489 if (bootverbose) 2490 if_printf(ifp, "bpf attached\n"); 2491} 2492 2493/* 2494 * Detach bpf from an interface. This involves detaching each descriptor 2495 * associated with the interface. Notify each descriptor as it's detached 2496 * so that any sleepers wake up and get ENXIO. 2497 */ 2498void 2499bpfdetach(struct ifnet *ifp) 2500{ 2501 struct bpf_if *bp, *bp_temp; 2502 struct bpf_d *d; 2503 int ndetached; 2504 2505 ndetached = 0; 2506 2507 BPF_LOCK(); 2508 /* Find all bpf_if struct's which reference ifp and detach them. */ 2509 LIST_FOREACH_SAFE(bp, &bpf_iflist, bif_next, bp_temp) { 2510 if (ifp != bp->bif_ifp) 2511 continue; 2512 2513 LIST_REMOVE(bp, bif_next); 2514 /* Add to to-be-freed list */ 2515 LIST_INSERT_HEAD(&bpf_freelist, bp, bif_next); 2516 2517 ndetached++; 2518 /* 2519 * Delay freeing bp till interface is detached 2520 * and all routes through this interface are removed. 2521 * Mark bp as detached to restrict new consumers. 2522 */ 2523 BPFIF_WLOCK(bp); 2524 bp->flags |= BPFIF_FLAG_DYING; 2525 BPFIF_WUNLOCK(bp); 2526 2527 CTR4(KTR_NET, "%s: sheduling free for encap %d (%p) for if %p", 2528 __func__, bp->bif_dlt, bp, ifp); 2529 2530 /* Free common descriptors */ 2531 while ((d = LIST_FIRST(&bp->bif_dlist)) != NULL) { 2532 bpf_detachd_locked(d); 2533 BPFD_LOCK(d); 2534 bpf_wakeup(d); 2535 BPFD_UNLOCK(d); 2536 } 2537 2538 /* Free writer-only descriptors */ 2539 while ((d = LIST_FIRST(&bp->bif_wlist)) != NULL) { 2540 bpf_detachd_locked(d); 2541 BPFD_LOCK(d); 2542 bpf_wakeup(d); 2543 BPFD_UNLOCK(d); 2544 } 2545 } 2546 BPF_UNLOCK(); 2547 2548#ifdef INVARIANTS 2549 if (ndetached == 0) 2550 printf("bpfdetach: %s was not attached\n", ifp->if_xname); 2551#endif 2552} 2553 2554/* 2555 * Interface departure handler. 2556 * Note departure event does not guarantee interface is going down. 2557 * Interface renaming is currently done via departure/arrival event set. 2558 * 2559 * Departure handled is called after all routes pointing to 2560 * given interface are removed and interface is in down state 2561 * restricting any packets to be sent/received. We assume it is now safe 2562 * to free data allocated by BPF. 2563 */ 2564static void 2565bpf_ifdetach(void *arg __unused, struct ifnet *ifp) 2566{ 2567 struct bpf_if *bp, *bp_temp; 2568 int nmatched = 0; 2569 2570 BPF_LOCK(); 2571 /* 2572 * Find matching entries in free list. 2573 * Nothing should be found if bpfdetach() was not called. 2574 */ 2575 LIST_FOREACH_SAFE(bp, &bpf_freelist, bif_next, bp_temp) { 2576 if (ifp != bp->bif_ifp) 2577 continue; 2578 2579 CTR3(KTR_NET, "%s: freeing BPF instance %p for interface %p", 2580 __func__, bp, ifp); 2581 2582 LIST_REMOVE(bp, bif_next); 2583 2584 rw_destroy(&bp->bif_lock); 2585 free(bp, M_BPF); 2586 2587 nmatched++; 2588 } 2589 BPF_UNLOCK(); 2590 2591 /* 2592 * Note that we cannot zero other pointers to 2593 * custom DLTs possibly used by given interface. 2594 */ 2595 if (nmatched != 0) 2596 ifp->if_bpf = NULL; 2597} 2598 2599/* 2600 * Get a list of available data link type of the interface. 2601 */ 2602static int 2603bpf_getdltlist(struct bpf_d *d, struct bpf_dltlist *bfl) 2604{ 2605 int n, error; 2606 struct ifnet *ifp; 2607 struct bpf_if *bp; 2608 2609 BPF_LOCK_ASSERT(); 2610 2611 ifp = d->bd_bif->bif_ifp; 2612 n = 0; 2613 error = 0; 2614 LIST_FOREACH(bp, &bpf_iflist, bif_next) { 2615 if (bp->bif_ifp != ifp) 2616 continue; 2617 if (bfl->bfl_list != NULL) { 2618 if (n >= bfl->bfl_len) 2619 return (ENOMEM); 2620 error = copyout(&bp->bif_dlt, 2621 bfl->bfl_list + n, sizeof(u_int)); 2622 } 2623 n++; 2624 } 2625 bfl->bfl_len = n; 2626 return (error); 2627} 2628 2629/* 2630 * Set the data link type of a BPF instance. 2631 */ 2632static int 2633bpf_setdlt(struct bpf_d *d, u_int dlt) 2634{ 2635 int error, opromisc; 2636 struct ifnet *ifp; 2637 struct bpf_if *bp; 2638 2639 BPF_LOCK_ASSERT(); 2640 2641 if (d->bd_bif->bif_dlt == dlt) 2642 return (0); 2643 ifp = d->bd_bif->bif_ifp; 2644 2645 LIST_FOREACH(bp, &bpf_iflist, bif_next) { 2646 if (bp->bif_ifp == ifp && bp->bif_dlt == dlt) 2647 break; 2648 } 2649 2650 if (bp != NULL) { 2651 opromisc = d->bd_promisc; 2652 bpf_attachd(d, bp); 2653 BPFD_LOCK(d); 2654 reset_d(d); 2655 BPFD_UNLOCK(d); 2656 if (opromisc) { 2657 error = ifpromisc(bp->bif_ifp, 1); 2658 if (error) 2659 if_printf(bp->bif_ifp, 2660 "bpf_setdlt: ifpromisc failed (%d)\n", 2661 error); 2662 else 2663 d->bd_promisc = 1; 2664 } 2665 } 2666 return (bp == NULL ? EINVAL : 0); 2667} 2668 2669static void 2670bpf_drvinit(void *unused) 2671{ 2672 struct cdev *dev; 2673 2674 mtx_init(&bpf_mtx, "bpf global lock", NULL, MTX_DEF); 2675 LIST_INIT(&bpf_iflist); 2676 LIST_INIT(&bpf_freelist); 2677 2678 dev = make_dev(&bpf_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600, "bpf"); 2679 /* For compatibility */ 2680 make_dev_alias(dev, "bpf0"); 2681 2682 /* Register interface departure handler */ 2683 bpf_ifdetach_cookie = EVENTHANDLER_REGISTER( 2684 ifnet_departure_event, bpf_ifdetach, NULL, 2685 EVENTHANDLER_PRI_ANY); 2686} 2687 2688/* 2689 * Zero out the various packet counters associated with all of the bpf 2690 * descriptors. At some point, we will probably want to get a bit more 2691 * granular and allow the user to specify descriptors to be zeroed. 2692 */ 2693static void 2694bpf_zero_counters(void) 2695{ 2696 struct bpf_if *bp; 2697 struct bpf_d *bd; 2698 2699 BPF_LOCK(); 2700 LIST_FOREACH(bp, &bpf_iflist, bif_next) { 2701 BPFIF_RLOCK(bp); 2702 LIST_FOREACH(bd, &bp->bif_dlist, bd_next) { 2703 BPFD_LOCK(bd); 2704 bd->bd_rcount = 0; 2705 bd->bd_dcount = 0; 2706 bd->bd_fcount = 0; 2707 bd->bd_wcount = 0; 2708 bd->bd_wfcount = 0; 2709 bd->bd_zcopy = 0; 2710 BPFD_UNLOCK(bd); 2711 } 2712 BPFIF_RUNLOCK(bp); 2713 } 2714 BPF_UNLOCK(); 2715} 2716 2717/* 2718 * Fill filter statistics 2719 */ 2720static void 2721bpfstats_fill_xbpf(struct xbpf_d *d, struct bpf_d *bd) 2722{ 2723 2724 bzero(d, sizeof(*d)); 2725 BPFD_LOCK_ASSERT(bd); 2726 d->bd_structsize = sizeof(*d); 2727 /* XXX: reading should be protected by global lock */ 2728 d->bd_immediate = bd->bd_immediate; 2729 d->bd_promisc = bd->bd_promisc; 2730 d->bd_hdrcmplt = bd->bd_hdrcmplt; 2731 d->bd_direction = bd->bd_direction; 2732 d->bd_feedback = bd->bd_feedback; 2733 d->bd_async = bd->bd_async; 2734 d->bd_rcount = bd->bd_rcount; 2735 d->bd_dcount = bd->bd_dcount; 2736 d->bd_fcount = bd->bd_fcount; 2737 d->bd_sig = bd->bd_sig; 2738 d->bd_slen = bd->bd_slen; 2739 d->bd_hlen = bd->bd_hlen; 2740 d->bd_bufsize = bd->bd_bufsize; 2741 d->bd_pid = bd->bd_pid; 2742 strlcpy(d->bd_ifname, 2743 bd->bd_bif->bif_ifp->if_xname, IFNAMSIZ); 2744 d->bd_locked = bd->bd_locked; 2745 d->bd_wcount = bd->bd_wcount; 2746 d->bd_wdcount = bd->bd_wdcount; 2747 d->bd_wfcount = bd->bd_wfcount; 2748 d->bd_zcopy = bd->bd_zcopy; 2749 d->bd_bufmode = bd->bd_bufmode; 2750} 2751 2752/* 2753 * Handle `netstat -B' stats request 2754 */ 2755static int 2756bpf_stats_sysctl(SYSCTL_HANDLER_ARGS) 2757{ 2758 struct xbpf_d *xbdbuf, *xbd, zerostats; 2759 int index, error; 2760 struct bpf_if *bp; 2761 struct bpf_d *bd; 2762 2763 /* 2764 * XXX This is not technically correct. It is possible for non 2765 * privileged users to open bpf devices. It would make sense 2766 * if the users who opened the devices were able to retrieve 2767 * the statistics for them, too. 2768 */ 2769 error = priv_check(req->td, PRIV_NET_BPF); 2770 if (error) 2771 return (error); 2772 /* 2773 * Check to see if the user is requesting that the counters be 2774 * zeroed out. Explicitly check that the supplied data is zeroed, 2775 * as we aren't allowing the user to set the counters currently. 2776 */ 2777 if (req->newptr != NULL) { 2778 if (req->newlen != sizeof(zerostats)) 2779 return (EINVAL); 2780 bzero(&zerostats, sizeof(zerostats)); 2781 xbd = req->newptr; 2782 if (bcmp(xbd, &zerostats, sizeof(*xbd)) != 0) 2783 return (EINVAL); 2784 bpf_zero_counters(); 2785 return (0); 2786 } 2787 if (req->oldptr == NULL) 2788 return (SYSCTL_OUT(req, 0, bpf_bpfd_cnt * sizeof(*xbd))); 2789 if (bpf_bpfd_cnt == 0) 2790 return (SYSCTL_OUT(req, 0, 0)); 2791 xbdbuf = malloc(req->oldlen, M_BPF, M_WAITOK); 2792 BPF_LOCK(); 2793 if (req->oldlen < (bpf_bpfd_cnt * sizeof(*xbd))) { 2794 BPF_UNLOCK(); 2795 free(xbdbuf, M_BPF); 2796 return (ENOMEM); 2797 } 2798 index = 0; 2799 LIST_FOREACH(bp, &bpf_iflist, bif_next) { 2800 BPFIF_RLOCK(bp); 2801 /* Send writers-only first */ 2802 LIST_FOREACH(bd, &bp->bif_wlist, bd_next) { 2803 xbd = &xbdbuf[index++]; 2804 BPFD_LOCK(bd); 2805 bpfstats_fill_xbpf(xbd, bd); 2806 BPFD_UNLOCK(bd); 2807 } 2808 LIST_FOREACH(bd, &bp->bif_dlist, bd_next) { 2809 xbd = &xbdbuf[index++]; 2810 BPFD_LOCK(bd); 2811 bpfstats_fill_xbpf(xbd, bd); 2812 BPFD_UNLOCK(bd); 2813 } 2814 BPFIF_RUNLOCK(bp); 2815 } 2816 BPF_UNLOCK(); 2817 error = SYSCTL_OUT(req, xbdbuf, index * sizeof(*xbd)); 2818 free(xbdbuf, M_BPF); 2819 return (error); 2820} 2821 2822SYSINIT(bpfdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE,bpf_drvinit,NULL); 2823 2824#else /* !DEV_BPF && !NETGRAPH_BPF */ 2825/* 2826 * NOP stubs to allow bpf-using drivers to load and function. 2827 * 2828 * A 'better' implementation would allow the core bpf functionality 2829 * to be loaded at runtime. 2830 */ 2831static struct bpf_if bp_null; 2832 2833void 2834bpf_tap(struct bpf_if *bp, u_char *pkt, u_int pktlen) 2835{ 2836} 2837 2838void 2839bpf_mtap(struct bpf_if *bp, struct mbuf *m) 2840{ 2841} 2842 2843void 2844bpf_mtap2(struct bpf_if *bp, void *d, u_int l, struct mbuf *m) 2845{ 2846} 2847 2848void 2849bpfattach(struct ifnet *ifp, u_int dlt, u_int hdrlen) 2850{ 2851 2852 bpfattach2(ifp, dlt, hdrlen, &ifp->if_bpf); 2853} 2854 2855void 2856bpfattach2(struct ifnet *ifp, u_int dlt, u_int hdrlen, struct bpf_if **driverp) 2857{ 2858 2859 *driverp = &bp_null; 2860} 2861 2862void 2863bpfdetach(struct ifnet *ifp) 2864{ 2865} 2866 2867u_int 2868bpf_filter(const struct bpf_insn *pc, u_char *p, u_int wirelen, u_int buflen) 2869{ 2870 return -1; /* "no filter" behaviour */ 2871} 2872 2873int 2874bpf_validate(const struct bpf_insn *f, int len) 2875{ 2876 return 0; /* false */ 2877} 2878 2879#endif /* !DEV_BPF && !NETGRAPH_BPF */ 2880