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/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <sys/mbuf.h> 33 #include <sys/kernel.h> 34 #include <sys/lock.h> 35 #include <sys/socket.h> 36 #include <net/ethernet.h> 37 #include <net/if.h> 38 #include <net/if_pflog.h> 39 #include <net/if_var.h> 40 #include <net/if_clone.h> 41 #include <net/if_types.h> 42 #include <net/vnet.h> 43 #include <net/bpf.h> 44 45 #include <netinet/in.h> 46 #include <netinet/ip_fw.h> 47 #include <netinet/ip_var.h> 48 #include <netpfil/ipfw/ip_fw_private.h> 49 50 VNET_DEFINE_STATIC(struct ifnet *, log_if); 51 VNET_DEFINE_STATIC(struct ifnet *, pflog_if); 52 VNET_DEFINE_STATIC(struct if_clone *, ipfw_cloner); 53 VNET_DEFINE_STATIC(struct if_clone *, ipfwlog_cloner); 54 #define V_ipfw_cloner VNET(ipfw_cloner) 55 #define V_ipfwlog_cloner VNET(ipfwlog_cloner) 56 #define V_log_if VNET(log_if) 57 #define V_pflog_if VNET(pflog_if) 58 59 static const char ipfwname[] = "ipfw"; 60 static const char ipfwlogname[] = "ipfwlog"; 61 62 static int 63 ipfw_bpf_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr) 64 { 65 66 return (EINVAL); 67 } 68 69 static int 70 ipfw_bpf_output(struct ifnet *ifp, struct mbuf *m, 71 const struct sockaddr *dst, struct route *ro) 72 { 73 74 if (m != NULL) 75 FREE_PKT(m); 76 return (0); 77 } 78 79 static void 80 ipfw_clone_destroy(struct ifnet *ifp) 81 { 82 83 if (ifp->if_hdrlen == ETHER_HDR_LEN) 84 V_log_if = NULL; 85 else 86 V_pflog_if = NULL; 87 88 NET_EPOCH_WAIT(); 89 bpfdetach(ifp); 90 if_detach(ifp); 91 if_free(ifp); 92 } 93 94 static int 95 ipfw_clone_create(struct if_clone *ifc, int unit, caddr_t params) 96 { 97 struct ifnet *ifp; 98 99 ifp = if_alloc(IFT_PFLOG); 100 if (ifp == NULL) 101 return (ENOSPC); 102 if_initname(ifp, ipfwname, unit); 103 ifp->if_flags = IFF_UP | IFF_SIMPLEX | IFF_MULTICAST; 104 ifp->if_mtu = 65536; 105 ifp->if_ioctl = ipfw_bpf_ioctl; 106 ifp->if_output = ipfw_bpf_output; 107 ifp->if_hdrlen = ETHER_HDR_LEN; 108 if_attach(ifp); 109 bpfattach(ifp, DLT_EN10MB, ETHER_HDR_LEN); 110 if (V_log_if != NULL) { 111 bpfdetach(ifp); 112 if_detach(ifp); 113 if_free(ifp); 114 return (EEXIST); 115 } 116 V_log_if = ifp; 117 return (0); 118 } 119 120 static int 121 ipfwlog_clone_create(struct if_clone *ifc, int unit, caddr_t params) 122 { 123 struct ifnet *ifp; 124 125 ifp = if_alloc(IFT_PFLOG); 126 if (ifp == NULL) 127 return (ENOSPC); 128 if_initname(ifp, ipfwlogname, unit); 129 ifp->if_flags = IFF_UP | IFF_SIMPLEX | IFF_MULTICAST; 130 ifp->if_mtu = 65536; 131 ifp->if_ioctl = ipfw_bpf_ioctl; 132 ifp->if_output = ipfw_bpf_output; 133 ifp->if_hdrlen = PFLOG_HDRLEN; 134 if_attach(ifp); 135 bpfattach(ifp, DLT_PFLOG, PFLOG_HDRLEN); 136 if (V_pflog_if != NULL) { 137 bpfdetach(ifp); 138 if_detach(ifp); 139 if_free(ifp); 140 return (EEXIST); 141 } 142 V_pflog_if = ifp; 143 return (0); 144 } 145 146 void 147 ipfw_bpf_tap(u_char *pkt, u_int pktlen) 148 { 149 struct ifnet *ifp = V_log_if; 150 151 NET_EPOCH_ASSERT(); 152 if (ifp != NULL) 153 BPF_TAP(ifp, pkt, pktlen); 154 } 155 156 void 157 ipfw_bpf_mtap(struct mbuf *m) 158 { 159 struct ifnet *ifp = V_log_if; 160 161 NET_EPOCH_ASSERT(); 162 if (ifp != NULL) 163 BPF_MTAP(ifp, m); 164 } 165 166 void 167 ipfw_bpf_mtap2(void *data, u_int dlen, struct mbuf *m) 168 { 169 struct ifnet *logif; 170 171 NET_EPOCH_ASSERT(); 172 switch (dlen) { 173 case (ETHER_HDR_LEN): 174 logif = V_log_if; 175 break; 176 case (PFLOG_HDRLEN): 177 logif = V_pflog_if; 178 break; 179 default: 180 #ifdef INVARIANTS 181 panic("%s: unsupported len %d", __func__, dlen); 182 #endif 183 logif = NULL; 184 } 185 186 if (logif != NULL) 187 BPF_MTAP2(logif, data, dlen, m); 188 } 189 190 void 191 ipfw_bpf_init(int first __unused) 192 { 193 194 V_log_if = NULL; 195 V_pflog_if = NULL; 196 V_ipfw_cloner = if_clone_simple(ipfwname, ipfw_clone_create, 197 ipfw_clone_destroy, 0); 198 V_ipfwlog_cloner = if_clone_simple(ipfwlogname, ipfwlog_clone_create, 199 ipfw_clone_destroy, 0); 200 } 201 202 void 203 ipfw_bpf_uninit(int last __unused) 204 { 205 206 if_clone_detach(V_ipfw_cloner); 207 if_clone_detach(V_ipfwlog_cloner); 208 } 209