| File: | net/if_pair.c |
| Warning: | line 143, column 21 Value stored to 'dstsc' during its initialization is never read |
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| 1 | /* $OpenBSD: if_pair.c,v 1.17 2021/01/13 01:57:31 kn Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 2015 Reyk Floeter <reyk@openbsd.org> |
| 5 | * Copyright (c) 2009 Theo de Raadt <deraadt@openbsd.org> |
| 6 | * |
| 7 | * Permission to use, copy, modify, and distribute this software for any |
| 8 | * purpose with or without fee is hereby granted, provided that the above |
| 9 | * copyright notice and this permission notice appear in all copies. |
| 10 | * |
| 11 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
| 12 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| 13 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
| 14 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| 15 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| 16 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
| 17 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| 18 | */ |
| 19 | |
| 20 | #include <sys/param.h> |
| 21 | #include <sys/systm.h> |
| 22 | #include <sys/mbuf.h> |
| 23 | #include <sys/socket.h> |
| 24 | #include <sys/sockio.h> |
| 25 | #include <sys/ioctl.h> |
| 26 | |
| 27 | #include <net/if.h> |
| 28 | #include <net/if_media.h> |
| 29 | |
| 30 | #include <netinet/in.h> |
| 31 | #include <netinet/if_ether.h> |
| 32 | |
| 33 | #include "bpfilter.h" |
| 34 | #if NBPFILTER1 > 0 |
| 35 | #include <net/bpf.h> |
| 36 | #endif |
| 37 | |
| 38 | void pairattach(int); |
| 39 | int pairioctl(struct ifnet *, u_long, caddr_t); |
| 40 | void pairstart(struct ifqueue *); |
| 41 | int pair_clone_create(struct if_clone *, int); |
| 42 | int pair_clone_destroy(struct ifnet *); |
| 43 | int pair_media_change(struct ifnet *); |
| 44 | void pair_media_status(struct ifnet *, struct ifmediareq *); |
| 45 | void pair_link_state(struct ifnet *); |
| 46 | |
| 47 | struct pair_softc { |
| 48 | struct arpcom sc_ac; |
| 49 | struct ifmedia sc_media; |
| 50 | unsigned int sc_pairedif; |
| 51 | }; |
| 52 | |
| 53 | struct if_clone pair_cloner = |
| 54 | IF_CLONE_INITIALIZER("pair", pair_clone_create, pair_clone_destroy){ .ifc_list = { ((void *)0), ((void *)0) }, .ifc_name = "pair" , .ifc_namelen = sizeof("pair") - 1, .ifc_create = pair_clone_create , .ifc_destroy = pair_clone_destroy, }; |
| 55 | |
| 56 | int |
| 57 | pair_media_change(struct ifnet *ifp) |
| 58 | { |
| 59 | return (0); |
| 60 | } |
| 61 | |
| 62 | void |
| 63 | pair_media_status(struct ifnet *ifp, struct ifmediareq *imr) |
| 64 | { |
| 65 | struct pair_softc *sc = ifp->if_softc; |
| 66 | struct ifnet *pairedifp; |
| 67 | |
| 68 | imr->ifm_active = IFM_ETHER0x0000000000000100ULL | IFM_AUTO0ULL; |
| 69 | |
| 70 | if ((pairedifp = if_get(sc->sc_pairedif)) == NULL((void *)0)) { |
| 71 | imr->ifm_status = 0; |
| 72 | return; |
| 73 | } |
| 74 | if_put(pairedifp); |
| 75 | |
| 76 | imr->ifm_status = IFM_AVALID0x0000000000000001ULL | IFM_ACTIVE0x0000000000000002ULL; |
| 77 | } |
| 78 | |
| 79 | void |
| 80 | pair_link_state(struct ifnet *ifp) |
| 81 | { |
| 82 | struct pair_softc *sc = ifp->if_softc; |
| 83 | struct ifnet *pairedifp; |
| 84 | unsigned int link_state; |
| 85 | |
| 86 | /* The pair state is determined by the paired interface */ |
| 87 | if ((pairedifp = if_get(sc->sc_pairedif)) != NULL((void *)0)) { |
| 88 | link_state = LINK_STATE_UP4; |
| 89 | if_put(pairedifp); |
| 90 | } else |
| 91 | link_state = LINK_STATE_DOWN2; |
| 92 | |
| 93 | if (ifp->if_link_stateif_data.ifi_link_state != link_state) { |
| 94 | ifp->if_link_stateif_data.ifi_link_state = link_state; |
| 95 | if_link_state_change(ifp); |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | void |
| 100 | pairattach(int npair) |
| 101 | { |
| 102 | if_clone_attach(&pair_cloner); |
| 103 | } |
| 104 | |
| 105 | int |
| 106 | pair_clone_create(struct if_clone *ifc, int unit) |
| 107 | { |
| 108 | struct ifnet *ifp; |
| 109 | struct pair_softc *sc; |
| 110 | |
| 111 | sc = malloc(sizeof(*sc), M_DEVBUF2, M_WAITOK0x0001|M_ZERO0x0008); |
| 112 | ifp = &sc->sc_ac.ac_if; |
| 113 | snprintf(ifp->if_xname, sizeof ifp->if_xname, "pair%d", unit); |
| 114 | ifp->if_flags = IFF_BROADCAST0x2 | IFF_SIMPLEX0x800 | IFF_MULTICAST0x8000; |
| 115 | ether_fakeaddr(ifp); |
| 116 | |
| 117 | ifp->if_softc = sc; |
| 118 | ifp->if_ioctl = pairioctl; |
| 119 | ifp->if_qstart = pairstart; |
| 120 | ifp->if_xflags = IFXF_CLONED0x2 | IFXF_MPSAFE0x1; |
| 121 | |
| 122 | ifp->if_hardmtu = ETHER_MAX_HARDMTU_LEN65435; |
| 123 | ifp->if_capabilitiesif_data.ifi_capabilities = IFCAP_VLAN_MTU0x00000010; |
| 124 | |
| 125 | ifmedia_init(&sc->sc_media, 0, pair_media_change, |
| 126 | pair_media_status); |
| 127 | ifmedia_add(&sc->sc_media, IFM_ETHER0x0000000000000100ULL | IFM_AUTO0ULL, 0, NULL((void *)0)); |
| 128 | ifmedia_set(&sc->sc_media, IFM_ETHER0x0000000000000100ULL | IFM_AUTO0ULL); |
| 129 | |
| 130 | if_attach(ifp); |
| 131 | ether_ifattach(ifp); |
| 132 | |
| 133 | pair_link_state(ifp); |
| 134 | |
| 135 | return (0); |
| 136 | } |
| 137 | |
| 138 | int |
| 139 | pair_clone_destroy(struct ifnet *ifp) |
| 140 | { |
| 141 | struct pair_softc *sc = ifp->if_softc; |
| 142 | struct ifnet *pairedifp; |
| 143 | struct pair_softc *dstsc = ifp->if_softc; |
Value stored to 'dstsc' during its initialization is never read | |
| 144 | |
| 145 | if ((pairedifp = if_get(sc->sc_pairedif)) != NULL((void *)0)) { |
| 146 | dstsc = pairedifp->if_softc; |
| 147 | dstsc->sc_pairedif = 0; |
| 148 | pair_link_state(pairedifp); |
| 149 | if_put(pairedifp); |
| 150 | } |
| 151 | |
| 152 | ifmedia_delete_instance(&sc->sc_media, IFM_INST_ANY((uint64_t) -1)); |
| 153 | ether_ifdetach(ifp); |
| 154 | if_detach(ifp); |
| 155 | free(sc, M_DEVBUF2, sizeof(*sc)); |
| 156 | |
| 157 | return (0); |
| 158 | } |
| 159 | |
| 160 | void |
| 161 | pairstart(struct ifqueue *ifq) |
| 162 | { |
| 163 | struct ifnet *ifp = ifq->ifq_if; |
| 164 | struct pair_softc *sc = (struct pair_softc *)ifp->if_softc; |
| 165 | struct mbuf_list ml = MBUF_LIST_INITIALIZER(){ ((void *)0), ((void *)0), 0 }; |
| 166 | struct ifnet *pairedifp; |
| 167 | struct mbuf *m; |
| 168 | |
| 169 | pairedifp = if_get(sc->sc_pairedif); |
| 170 | |
| 171 | while ((m = ifq_dequeue(ifq)) != NULL((void *)0)) { |
| 172 | #if NBPFILTER1 > 0 |
| 173 | if (ifp->if_bpf) |
| 174 | bpf_mtap(ifp->if_bpf, m, BPF_DIRECTION_OUT(1 << 1)); |
| 175 | #endif /* NBPFILTER > 0 */ |
| 176 | |
| 177 | if (pairedifp != NULL((void *)0)) { |
| 178 | if (m->m_flagsm_hdr.mh_flags & M_PKTHDR0x0002) |
| 179 | m_resethdr(m); |
| 180 | ml_enqueue(&ml, m); |
| 181 | } else |
| 182 | m_freem(m); |
| 183 | } |
| 184 | |
| 185 | if (pairedifp != NULL((void *)0)) { |
| 186 | if_input(pairedifp, &ml); |
| 187 | if_put(pairedifp); |
| 188 | } |
| 189 | } |
| 190 | |
| 191 | int |
| 192 | pairioctl(struct ifnet *ifp, u_long cmd, caddr_t data) |
| 193 | { |
| 194 | struct pair_softc *sc = (struct pair_softc *)ifp->if_softc; |
| 195 | struct ifreq *ifr = (struct ifreq *)data; |
| 196 | struct if_clone *ifc; |
| 197 | struct pair_softc *pairedsc = ifp->if_softc; |
| 198 | struct ifnet *oldifp = NULL((void *)0), *newifp = NULL((void *)0); |
| 199 | int error = 0, unit; |
| 200 | |
| 201 | switch (cmd) { |
| 202 | case SIOCSIFADDR((unsigned long)0x80000000 | ((sizeof(struct ifreq) & 0x1fff ) << 16) | ((('i')) << 8) | ((12))): |
| 203 | ifp->if_flags |= IFF_UP0x1; |
| 204 | /* FALLTHROUGH */ |
| 205 | |
| 206 | case SIOCSIFFLAGS((unsigned long)0x80000000 | ((sizeof(struct ifreq) & 0x1fff ) << 16) | ((('i')) << 8) | ((16))): |
| 207 | if (ifp->if_flags & IFF_UP0x1) |
| 208 | ifp->if_flags |= IFF_RUNNING0x40; |
| 209 | else |
| 210 | ifp->if_flags &= ~IFF_RUNNING0x40; |
| 211 | break; |
| 212 | |
| 213 | case SIOCADDMULTI((unsigned long)0x80000000 | ((sizeof(struct ifreq) & 0x1fff ) << 16) | ((('i')) << 8) | ((49))): |
| 214 | case SIOCDELMULTI((unsigned long)0x80000000 | ((sizeof(struct ifreq) & 0x1fff ) << 16) | ((('i')) << 8) | ((50))): |
| 215 | break; |
| 216 | |
| 217 | case SIOCGIFMEDIA(((unsigned long)0x80000000|(unsigned long)0x40000000) | ((sizeof (struct ifmediareq) & 0x1fff) << 16) | ((('i')) << 8) | ((56))): |
| 218 | case SIOCSIFMEDIA(((unsigned long)0x80000000|(unsigned long)0x40000000) | ((sizeof (struct ifreq) & 0x1fff) << 16) | ((('i')) << 8) | ((55))): |
| 219 | error = ifmedia_ioctl(ifp, ifr, &sc->sc_media, cmd); |
| 220 | break; |
| 221 | |
| 222 | case SIOCSIFPAIR((unsigned long)0x80000000 | ((sizeof(struct ifreq) & 0x1fff ) << 16) | ((('i')) << 8) | ((176))): |
| 223 | if (sc->sc_pairedif == ifr->ifr_indexifr_ifru.ifru_index) |
| 224 | break; |
| 225 | |
| 226 | /* Cannot link to myself */ |
| 227 | if (ifr->ifr_indexifr_ifru.ifru_index == ifp->if_index) { |
| 228 | error = EINVAL22; |
| 229 | break; |
| 230 | } |
| 231 | |
| 232 | oldifp = if_get(sc->sc_pairedif); |
| 233 | newifp = if_get(ifr->ifr_indexifr_ifru.ifru_index); |
| 234 | |
| 235 | if (newifp != NULL((void *)0)) { |
| 236 | pairedsc = newifp->if_softc; |
| 237 | |
| 238 | if (pairedsc->sc_pairedif != 0) { |
| 239 | error = EBUSY16; |
| 240 | break; |
| 241 | } |
| 242 | |
| 243 | /* Only allow pair(4) interfaces for the pair */ |
| 244 | if ((ifc = if_clone_lookup(newifp->if_xname, |
| 245 | &unit)) == NULL((void *)0) || strcmp("pair", |
| 246 | ifc->ifc_name) != 0) { |
| 247 | error = ENODEV19; |
| 248 | break; |
| 249 | } |
| 250 | |
| 251 | pairedsc->sc_pairedif = ifp->if_index; |
| 252 | sc->sc_pairedif = ifr->ifr_indexifr_ifru.ifru_index; |
| 253 | } else |
| 254 | sc->sc_pairedif = 0; |
| 255 | |
| 256 | if (oldifp != NULL((void *)0)) { |
| 257 | pairedsc = oldifp->if_softc; |
| 258 | pairedsc->sc_pairedif = 0; |
| 259 | } |
| 260 | break; |
| 261 | |
| 262 | case SIOCGIFPAIR(((unsigned long)0x80000000|(unsigned long)0x40000000) | ((sizeof (struct ifreq) & 0x1fff) << 16) | ((('i')) << 8) | ((177))): |
| 263 | ifr->ifr_indexifr_ifru.ifru_index = sc->sc_pairedif; |
| 264 | break; |
| 265 | |
| 266 | default: |
| 267 | error = ether_ioctl(ifp, &sc->sc_ac, cmd, data); |
| 268 | } |
| 269 | |
| 270 | if (newifp != NULL((void *)0) || oldifp != NULL((void *)0)) |
| 271 | pair_link_state(ifp); |
| 272 | if (oldifp != NULL((void *)0)) { |
| 273 | pair_link_state(oldifp); |
| 274 | if_put(oldifp); |
| 275 | } |
| 276 | if (newifp != NULL((void *)0)) { |
| 277 | pair_link_state(newifp); |
| 278 | if_put(newifp); |
| 279 | } |
| 280 | |
| 281 | return (error); |
| 282 | } |