1 /*- 2 * Copyright (c) 2016 Yandex LLC 3 * Copyright (c) 2016 Andrey V. Elsukov <ae@FreeBSD.org> 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/param.h> 28 #include <sys/systm.h> 29 #include <sys/mbuf.h> 30 #include <sys/kernel.h> 31 #include <sys/lock.h> 32 #include <sys/socket.h> 33 #include <net/ethernet.h> 34 #include <net/if.h> 35 #include <net/if_pflog.h> 36 #include <net/if_var.h> 37 #include <net/if_clone.h> 38 #include <net/if_private.h> 39 #include <net/if_types.h> 40 #include <net/vnet.h> 41 #include <net/bpf.h> 42 43 #include <netinet/in.h> 44 #include <netinet/ip_fw.h> 45 #include <netinet/ip_var.h> 46 #include <netpfil/ipfw/ip_fw_private.h> 47 48 VNET_DEFINE_STATIC(struct ifnet *, log_if); 49 VNET_DEFINE_STATIC(struct ifnet *, pflog_if); 50 VNET_DEFINE_STATIC(struct if_clone *, ipfw_cloner); 51 VNET_DEFINE_STATIC(struct if_clone *, ipfwlog_cloner); 52 #define V_ipfw_cloner VNET(ipfw_cloner) 53 #define V_ipfwlog_cloner VNET(ipfwlog_cloner) 54 #define V_log_if VNET(log_if) 55 #define V_pflog_if VNET(pflog_if) 56 57 static const char ipfwname[] = "ipfw"; 58 static const char ipfwlogname[] = "ipfwlog"; 59 60 static int 61 ipfw_bpf_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr) 62 { 63 64 return (EINVAL); 65 } 66 67 static int 68 ipfw_bpf_output(struct ifnet *ifp, struct mbuf *m, 69 const struct sockaddr *dst, struct route *ro) 70 { 71 72 if (m != NULL) 73 FREE_PKT(m); 74 return (0); 75 } 76 77 static void 78 ipfw_clone_destroy(struct ifnet *ifp) 79 { 80 81 if (ifp->if_hdrlen == ETHER_HDR_LEN) 82 V_log_if = NULL; 83 else 84 V_pflog_if = NULL; 85 86 NET_EPOCH_WAIT(); 87 bpfdetach(ifp); 88 if_detach(ifp); 89 if_free(ifp); 90 } 91 92 static int 93 ipfw_clone_create(struct if_clone *ifc, int unit, caddr_t params) 94 { 95 struct ifnet *ifp; 96 97 ifp = if_alloc(IFT_PFLOG); 98 if_initname(ifp, ipfwname, unit); 99 ifp->if_flags = IFF_UP | IFF_SIMPLEX | IFF_MULTICAST; 100 ifp->if_mtu = 65536; 101 ifp->if_ioctl = ipfw_bpf_ioctl; 102 ifp->if_output = ipfw_bpf_output; 103 ifp->if_hdrlen = ETHER_HDR_LEN; 104 if_attach(ifp); 105 bpfattach(ifp, DLT_EN10MB, ETHER_HDR_LEN); 106 if (V_log_if != NULL) { 107 bpfdetach(ifp); 108 if_detach(ifp); 109 if_free(ifp); 110 return (EEXIST); 111 } 112 V_log_if = ifp; 113 return (0); 114 } 115 116 static int 117 ipfwlog_clone_create(struct if_clone *ifc, int unit, caddr_t params) 118 { 119 struct ifnet *ifp; 120 121 ifp = if_alloc(IFT_PFLOG); 122 if_initname(ifp, ipfwlogname, unit); 123 ifp->if_flags = IFF_UP | IFF_SIMPLEX | IFF_MULTICAST; 124 ifp->if_mtu = 65536; 125 ifp->if_ioctl = ipfw_bpf_ioctl; 126 ifp->if_output = ipfw_bpf_output; 127 ifp->if_hdrlen = PFLOG_HDRLEN; 128 if_attach(ifp); 129 bpfattach(ifp, DLT_PFLOG, PFLOG_HDRLEN); 130 if (V_pflog_if != NULL) { 131 bpfdetach(ifp); 132 if_detach(ifp); 133 if_free(ifp); 134 return (EEXIST); 135 } 136 V_pflog_if = ifp; 137 return (0); 138 } 139 140 void 141 ipfw_bpf_tap(u_char *pkt, u_int pktlen) 142 { 143 struct ifnet *ifp = V_log_if; 144 145 NET_EPOCH_ASSERT(); 146 if (ifp != NULL) 147 BPF_TAP(ifp, pkt, pktlen); 148 } 149 150 void 151 ipfw_bpf_mtap(struct mbuf *m) 152 { 153 struct ifnet *ifp = V_log_if; 154 155 NET_EPOCH_ASSERT(); 156 if (ifp != NULL) 157 BPF_MTAP(ifp, m); 158 } 159 160 void 161 ipfw_bpf_mtap2(void *data, u_int dlen, struct mbuf *m) 162 { 163 struct ifnet *logif; 164 165 NET_EPOCH_ASSERT(); 166 switch (dlen) { 167 case (ETHER_HDR_LEN): 168 logif = V_log_if; 169 break; 170 case (PFLOG_HDRLEN): 171 logif = V_pflog_if; 172 break; 173 default: 174 #ifdef INVARIANTS 175 panic("%s: unsupported len %d", __func__, dlen); 176 #endif 177 logif = NULL; 178 } 179 180 if (logif != NULL) 181 BPF_MTAP2(logif, data, dlen, m); 182 } 183 184 void 185 ipfw_bpf_init(int first __unused) 186 { 187 188 V_log_if = NULL; 189 V_pflog_if = NULL; 190 V_ipfw_cloner = if_clone_simple(ipfwname, ipfw_clone_create, 191 ipfw_clone_destroy, 0); 192 V_ipfwlog_cloner = if_clone_simple(ipfwlogname, ipfwlog_clone_create, 193 ipfw_clone_destroy, 0); 194 } 195 196 void 197 ipfw_bpf_uninit(int last __unused) 198 { 199 200 if_clone_detach(V_ipfw_cloner); 201 if_clone_detach(V_ipfwlog_cloner); 202 } 203