File: | net/if_pair.c |
Warning: | line 143, column 21 Value stored to 'dstsc' during its initialization is never read |
Press '?' to see keyboard shortcuts
Keyboard shortcuts:
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 | } |