if_pflog.c

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    1 /*-
    2  * The authors of this code are John Ioannidis (ji@tla.org),
    3  * Angelos D. Keromytis (kermit@csd.uch.gr) and
    4  * Niels Provos (provos@physnet.uni-hamburg.de).
    5  *
    6  * This code was written by John Ioannidis for BSD/OS in Athens, Greece,
    7  * in November 1995.
    8  *
    9  * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
   10  * by Angelos D. Keromytis.
   11  *
   12  * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
   13  * and Niels Provos.
   14  *
   15  * Copyright (C) 1995, 1996, 1997, 1998 by John Ioannidis, Angelos D. Keromytis
   16  * and Niels Provos.
   17  * Copyright (c) 2001, Angelos D. Keromytis, Niels Provos.
   18  *
   19  * Permission to use, copy, and modify this software with or without fee
   20  * is hereby granted, provided that this entire notice is included in
   21  * all copies of any software which is or includes a copy or
   22  * modification of this software.
   23  * You may use this code under the GNU public license if you so wish. Please
   24  * contribute changes back to the authors under this freer than GPL license
   25  * so that we may further the use of strong encryption without limitations to
   26  * all.
   27  *
   28  * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
   29  * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
   30  * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
   31  * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
   32  * PURPOSE.
   33  *
   34  *      $OpenBSD: if_pflog.c,v 1.26 2007/10/18 21:58:18 mpf Exp $
   35  */
   36 
   37 #include <sys/cdefs.h>
   38 __FBSDID("$FreeBSD: releng/11.0/sys/netpfil/pf/if_pflog.c 302159 2016-06-23 22:31:10Z bz $");
   39 
   40 #include "opt_inet.h"
   41 #include "opt_inet6.h"
   42 #include "opt_bpf.h"
   43 #include "opt_pf.h"
   44 
   45 #include <sys/param.h>
   46 #include <sys/kernel.h>
   47 #include <sys/mbuf.h>
   48 #include <sys/module.h>
   49 #include <sys/proc.h>
   50 #include <sys/socket.h>
   51 #include <sys/sockio.h>
   52 
   53 #include <net/bpf.h>
   54 #include <net/if.h>
   55 #include <net/if_var.h>
   56 #include <net/if_clone.h>
   57 #include <net/if_pflog.h>
   58 #include <net/if_types.h>
   59 #include <net/vnet.h>
   60 #include <net/pfvar.h>
   61 
   62 #if defined(INET) || defined(INET6)
   63 #include <netinet/in.h>
   64 #endif
   65 #ifdef  INET
   66 #include <netinet/in_var.h>
   67 #include <netinet/ip.h>
   68 #endif
   69 
   70 #ifdef INET6
   71 #include <netinet6/in6_var.h>
   72 #include <netinet6/nd6.h>
   73 #endif /* INET6 */
   74 
   75 #ifdef INET
   76 #include <machine/in_cksum.h>
   77 #endif /* INET */
   78 
   79 #define PFLOGMTU        (32768 + MHLEN + MLEN)
   80 
   81 #ifdef PFLOGDEBUG
   82 #define DPRINTF(x)    do { if (pflogdebug) printf x ; } while (0)
   83 #else
   84 #define DPRINTF(x)
   85 #endif
   86 
   87 static int      pflogoutput(struct ifnet *, struct mbuf *,
   88                     const struct sockaddr *, struct route *);
   89 static void     pflogattach(int);
   90 static int      pflogioctl(struct ifnet *, u_long, caddr_t);
   91 static void     pflogstart(struct ifnet *);
   92 static int      pflog_clone_create(struct if_clone *, int, caddr_t);
   93 static void     pflog_clone_destroy(struct ifnet *);
   94 
   95 static const char pflogname[] = "pflog";
   96 
   97 static VNET_DEFINE(struct if_clone *, pflog_cloner);
   98 #define V_pflog_cloner          VNET(pflog_cloner)
   99 
  100 VNET_DEFINE(struct ifnet *, pflogifs[PFLOGIFS_MAX]);    /* for fast access */
  101 #define V_pflogifs              VNET(pflogifs)
  102 
  103 static void
  104 pflogattach(int npflog __unused)
  105 {
  106         int     i;
  107         for (i = 0; i < PFLOGIFS_MAX; i++)
  108                 V_pflogifs[i] = NULL;
  109         V_pflog_cloner = if_clone_simple(pflogname, pflog_clone_create,
  110             pflog_clone_destroy, 1);
  111 }
  112 
  113 static int
  114 pflog_clone_create(struct if_clone *ifc, int unit, caddr_t param)
  115 {
  116         struct ifnet *ifp;
  117 
  118         if (unit >= PFLOGIFS_MAX)
  119                 return (EINVAL);
  120 
  121         ifp = if_alloc(IFT_PFLOG);
  122         if (ifp == NULL) {
  123                 return (ENOSPC);
  124         }
  125         if_initname(ifp, pflogname, unit);
  126         ifp->if_mtu = PFLOGMTU;
  127         ifp->if_ioctl = pflogioctl;
  128         ifp->if_output = pflogoutput;
  129         ifp->if_start = pflogstart;
  130         ifp->if_snd.ifq_maxlen = ifqmaxlen;
  131         ifp->if_hdrlen = PFLOG_HDRLEN;
  132         if_attach(ifp);
  133 
  134         bpfattach(ifp, DLT_PFLOG, PFLOG_HDRLEN);
  135 
  136         V_pflogifs[unit] = ifp;
  137 
  138         return (0);
  139 }
  140 
  141 static void
  142 pflog_clone_destroy(struct ifnet *ifp)
  143 {
  144         int i;
  145 
  146         for (i = 0; i < PFLOGIFS_MAX; i++)
  147                 if (V_pflogifs[i] == ifp)
  148                         V_pflogifs[i] = NULL;
  149 
  150         bpfdetach(ifp);
  151         if_detach(ifp);
  152         if_free(ifp);
  153 }
  154 
  155 /*
  156  * Start output on the pflog interface.
  157  */
  158 static void
  159 pflogstart(struct ifnet *ifp)
  160 {
  161         struct mbuf *m;
  162 
  163         for (;;) {
  164                 IF_LOCK(&ifp->if_snd);
  165                 _IF_DEQUEUE(&ifp->if_snd, m);
  166                 IF_UNLOCK(&ifp->if_snd);
  167 
  168                 if (m == NULL)
  169                         return;
  170                 else
  171                         m_freem(m);
  172         }
  173 }
  174 
  175 static int
  176 pflogoutput(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
  177         struct route *rt)
  178 {
  179         m_freem(m);
  180         return (0);
  181 }
  182 
  183 /* ARGSUSED */
  184 static int
  185 pflogioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
  186 {
  187         switch (cmd) {
  188         case SIOCSIFFLAGS:
  189                 if (ifp->if_flags & IFF_UP)
  190                         ifp->if_drv_flags |= IFF_DRV_RUNNING;
  191                 else
  192                         ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
  193                 break;
  194         default:
  195                 return (ENOTTY);
  196         }
  197 
  198         return (0);
  199 }
  200 
  201 static int
  202 pflog_packet(struct pfi_kif *kif, struct mbuf *m, sa_family_t af, u_int8_t dir,
  203     u_int8_t reason, struct pf_rule *rm, struct pf_rule *am,
  204     struct pf_ruleset *ruleset, struct pf_pdesc *pd, int lookupsafe)
  205 {
  206         struct ifnet *ifn;
  207         struct pfloghdr hdr;
  208 
  209         if (kif == NULL || m == NULL || rm == NULL || pd == NULL)
  210                 return ( 1);
  211 
  212         if ((ifn = V_pflogifs[rm->logif]) == NULL || !ifn->if_bpf)
  213                 return (0);
  214 
  215         bzero(&hdr, sizeof(hdr));
  216         hdr.length = PFLOG_REAL_HDRLEN;
  217         hdr.af = af;
  218         hdr.action = rm->action;
  219         hdr.reason = reason;
  220         memcpy(hdr.ifname, kif->pfik_name, sizeof(hdr.ifname));
  221 
  222         if (am == NULL) {
  223                 hdr.rulenr = htonl(rm->nr);
  224                 hdr.subrulenr =  1;
  225         } else {
  226                 hdr.rulenr = htonl(am->nr);
  227                 hdr.subrulenr = htonl(rm->nr);
  228                 if (ruleset != NULL && ruleset->anchor != NULL)
  229                         strlcpy(hdr.ruleset, ruleset->anchor->name,
  230                             sizeof(hdr.ruleset));
  231         }
  232         /*
  233          * XXXGL: we avoid pf_socket_lookup() when we are holding
  234          * state lock, since this leads to unsafe LOR.
  235          * These conditions are very very rare, however.
  236          */
  237         if (rm->log & PF_LOG_SOCKET_LOOKUP && !pd->lookup.done && lookupsafe)
  238                 pd->lookup.done = pf_socket_lookup(dir, pd, m);
  239         if (pd->lookup.done > 0)
  240                 hdr.uid = pd->lookup.uid;
  241         else
  242                 hdr.uid = UID_MAX;
  243         hdr.pid = NO_PID;
  244         hdr.rule_uid = rm->cuid;
  245         hdr.rule_pid = rm->cpid;
  246         hdr.dir = dir;
  247 
  248 #ifdef INET
  249         if (af == AF_INET && dir == PF_OUT) {
  250                 struct ip *ip;
  251 
  252                 ip = mtod(m, struct ip *);
  253                 ip->ip_sum = 0;
  254                 ip->ip_sum = in_cksum(m, ip->ip_hl << 2);
  255         }
  256 #endif /* INET */
  257 
  258         if_inc_counter(ifn, IFCOUNTER_OPACKETS, 1);
  259         if_inc_counter(ifn, IFCOUNTER_OBYTES, m->m_pkthdr.len);
  260         BPF_MTAP2(ifn, &hdr, PFLOG_HDRLEN, m);
  261 
  262         return (0);
  263 }
  264 
  265 static void
  266 vnet_pflog_init(const void *unused __unused)
  267 {
  268 
  269         pflogattach(1);
  270 }
  271 VNET_SYSINIT(vnet_pflog_init, SI_SUB_PROTO_FIREWALL, SI_ORDER_ANY,
  272     vnet_pflog_init, NULL);
  273 
  274 static void
  275 vnet_pflog_uninit(const void *unused __unused)
  276 {
  277 
  278         if_clone_detach(V_pflog_cloner);
  279 }
  280 /*
  281  * Detach after pf is gone; otherwise we might touch pflog memory
  282  * from within pf after freeing pflog.
  283  */
  284 VNET_SYSUNINIT(vnet_pflog_uninit, SI_SUB_INIT_IF, SI_ORDER_SECOND,
  285     vnet_pflog_uninit, NULL);
  286 
  287 static int
  288 pflog_modevent(module_t mod, int type, void *data)
  289 {
  290         int error = 0;
  291 
  292         switch (type) {
  293         case MOD_LOAD:
  294                 PF_RULES_WLOCK();
  295                 pflog_packet_ptr = pflog_packet;
  296                 PF_RULES_WUNLOCK();
  297                 break;
  298         case MOD_UNLOAD:
  299                 PF_RULES_WLOCK();
  300                 pflog_packet_ptr = NULL;
  301                 PF_RULES_WUNLOCK();
  302                 break;
  303         default:
  304                 error = EOPNOTSUPP;
  305                 break;
  306         }
  307 
  308         return error;
  309 }
  310 
  311 static moduledata_t pflog_mod = { pflogname, pflog_modevent, 0 };
  312 
  313 #define PFLOG_MODVER 1
  314 
  315 /* Do not run before pf is initialized as we depend on its locks. */
  316 DECLARE_MODULE(pflog, pflog_mod, SI_SUB_PROTO_FIREWALL, SI_ORDER_ANY);
  317 MODULE_VERSION(pflog, PFLOG_MODVER);
  318 MODULE_DEPEND(pflog, pf, PF_MODVER, PF_MODVER, PF_MODVER);

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FreeBSD/Linux Kernel Cross Reference sys/netpfil/pf/if_pflog.c

FreeBSD/Linux Kernel Cross Reference
sys/netpfil/pf/if_pflog.c