diff options
Diffstat (limited to 'freebsd/sys/netpfil/ipfw/ip_fw_bpf.c')
| -rw-r--r-- | freebsd/sys/netpfil/ipfw/ip_fw_bpf.c | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/freebsd/sys/netpfil/ipfw/ip_fw_bpf.c b/freebsd/sys/netpfil/ipfw/ip_fw_bpf.c new file mode 100644 index 00000000..3127809b --- /dev/null +++ b/freebsd/sys/netpfil/ipfw/ip_fw_bpf.c @@ -0,0 +1,211 @@ +#include <machine/rtems-bsd-kernel-space.h> + +/*- + * Copyright (c) 2016 Yandex LLC + * Copyright (c) 2016 Andrey V. Elsukov <ae@FreeBSD.org> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <rtems/bsd/sys/param.h> +#include <sys/systm.h> +#include <sys/mbuf.h> +#include <sys/kernel.h> +#include <rtems/bsd/sys/lock.h> +#include <sys/rmlock.h> +#include <sys/socket.h> +#include <net/ethernet.h> +#include <net/if.h> +#include <net/if_pflog.h> +#include <net/if_var.h> +#include <net/if_clone.h> +#include <net/if_types.h> +#include <net/vnet.h> +#include <net/bpf.h> + +#include <netinet/in.h> +#include <netinet/ip_fw.h> +#include <netinet/ip_var.h> +#include <netpfil/ipfw/ip_fw_private.h> + +static VNET_DEFINE(struct ifnet *, log_if); +static VNET_DEFINE(struct ifnet *, pflog_if); +static VNET_DEFINE(struct if_clone *, ipfw_cloner); +static VNET_DEFINE(struct if_clone *, ipfwlog_cloner); +#define V_ipfw_cloner VNET(ipfw_cloner) +#define V_ipfwlog_cloner VNET(ipfwlog_cloner) +#define V_log_if VNET(log_if) +#define V_pflog_if VNET(pflog_if) + +static struct rmlock log_if_lock; +#define LOGIF_LOCK_INIT(x) rm_init(&log_if_lock, "ipfw log_if lock") +#define LOGIF_LOCK_DESTROY(x) rm_destroy(&log_if_lock) +#define LOGIF_RLOCK_TRACKER struct rm_priotracker _log_tracker +#define LOGIF_RLOCK(x) rm_rlock(&log_if_lock, &_log_tracker) +#define LOGIF_RUNLOCK(x) rm_runlock(&log_if_lock, &_log_tracker) +#define LOGIF_WLOCK(x) rm_wlock(&log_if_lock) +#define LOGIF_WUNLOCK(x) rm_wunlock(&log_if_lock) + +static const char ipfwname[] = "ipfw"; +static const char ipfwlogname[] = "ipfwlog"; + +static int +ipfw_bpf_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr) +{ + + return (EINVAL); +} + +static int +ipfw_bpf_output(struct ifnet *ifp, struct mbuf *m, + const struct sockaddr *dst, struct route *ro) +{ + + if (m != NULL) + FREE_PKT(m); + return (0); +} + +static void +ipfw_clone_destroy(struct ifnet *ifp) +{ + + LOGIF_WLOCK(); + if (ifp->if_hdrlen == ETHER_HDR_LEN) + V_log_if = NULL; + else + V_pflog_if = NULL; + LOGIF_WUNLOCK(); + + bpfdetach(ifp); + if_detach(ifp); + if_free(ifp); +} + +static int +ipfw_clone_create(struct if_clone *ifc, int unit, caddr_t params) +{ + struct ifnet *ifp; + + ifp = if_alloc(IFT_PFLOG); + if (ifp == NULL) + return (ENOSPC); + if_initname(ifp, ipfwname, unit); + ifp->if_flags = IFF_UP | IFF_SIMPLEX | IFF_MULTICAST; + ifp->if_mtu = 65536; + ifp->if_ioctl = ipfw_bpf_ioctl; + ifp->if_output = ipfw_bpf_output; + ifp->if_hdrlen = ETHER_HDR_LEN; + if_attach(ifp); + bpfattach(ifp, DLT_EN10MB, ETHER_HDR_LEN); + LOGIF_WLOCK(); + if (V_log_if != NULL) { + LOGIF_WUNLOCK(); + bpfdetach(ifp); + if_detach(ifp); + if_free(ifp); + return (EEXIST); + } + V_log_if = ifp; + LOGIF_WUNLOCK(); + return (0); +} + +static int +ipfwlog_clone_create(struct if_clone *ifc, int unit, caddr_t params) +{ + struct ifnet *ifp; + + ifp = if_alloc(IFT_PFLOG); + if (ifp == NULL) + return (ENOSPC); + if_initname(ifp, ipfwlogname, unit); + ifp->if_flags = IFF_UP | IFF_SIMPLEX | IFF_MULTICAST; + ifp->if_mtu = 65536; + ifp->if_ioctl = ipfw_bpf_ioctl; + ifp->if_output = ipfw_bpf_output; + ifp->if_hdrlen = PFLOG_HDRLEN; + if_attach(ifp); + bpfattach(ifp, DLT_PFLOG, PFLOG_HDRLEN); + LOGIF_WLOCK(); + if (V_pflog_if != NULL) { + LOGIF_WUNLOCK(); + bpfdetach(ifp); + if_detach(ifp); + if_free(ifp); + return (EEXIST); + } + V_pflog_if = ifp; + LOGIF_WUNLOCK(); + return (0); +} + +void +ipfw_bpf_mtap2(void *data, u_int dlen, struct mbuf *m) +{ + LOGIF_RLOCK_TRACKER; + + LOGIF_RLOCK(); + if (dlen == ETHER_HDR_LEN) { + if (V_log_if == NULL) { + LOGIF_RUNLOCK(); + return; + } + BPF_MTAP2(V_log_if, data, dlen, m); + } else if (dlen == PFLOG_HDRLEN) { + if (V_pflog_if == NULL) { + LOGIF_RUNLOCK(); + return; + } + BPF_MTAP2(V_pflog_if, data, dlen, m); + } + LOGIF_RUNLOCK(); +} + +void +ipfw_bpf_init(int first) +{ + + if (first) { + LOGIF_LOCK_INIT(); + V_log_if = NULL; + V_pflog_if = NULL; + } + V_ipfw_cloner = if_clone_simple(ipfwname, ipfw_clone_create, + ipfw_clone_destroy, 0); + V_ipfwlog_cloner = if_clone_simple(ipfwlogname, ipfwlog_clone_create, + ipfw_clone_destroy, 0); +} + +void +ipfw_bpf_uninit(int last) +{ + + if_clone_detach(V_ipfw_cloner); + if_clone_detach(V_ipfwlog_cloner); + if (last) + LOGIF_LOCK_DESTROY(); +} + |