diff options
Diffstat (limited to 'sys/net/if_media.c')
| -rw-r--r-- | sys/net/if_media.c | 475 |
1 files changed, 475 insertions, 0 deletions
diff --git a/sys/net/if_media.c b/sys/net/if_media.c new file mode 100644 index 0000000..1dcf18f --- /dev/null +++ b/sys/net/if_media.c @@ -0,0 +1,475 @@ +/* $NetBSD: if_media.c,v 1.1 1997/03/17 02:55:15 thorpej Exp $ */ + +/* + * Copyright (c) 1997 + * Jonathan Stone and Jason R. Thorpe. All rights reserved. + * + * This software is derived from information provided by Matt Thomas. + * + * 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. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by Jonathan Stone + * and Jason R. Thorpe for the NetBSD Project. + * 4. The names of the authors may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``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 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. + */ + +/* + * BSD/OS-compatible network interface media selection. + * + * Where it is safe to do so, this code strays slightly from the BSD/OS + * design. Software which uses the API (device drivers, basically) + * shouldn't notice any difference. + * + * Many thanks to Matt Thomas for providing the information necessary + * to implement this interface. + */ + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/errno.h> +#include <sys/ioctl.h> +#include <sys/socket.h> +#include <sys/malloc.h> + +#include <net/if.h> +#include <net/if_media.h> +#include <net/netisr.h> + +/* + * Compile-time options: + * IFMEDIA_DEBUG: + * turn on implementation-level debug printfs. + * Useful for debugging newly-ported drivers. + */ + +struct ifmedia_entry *ifmedia_match __P((struct ifmedia *ifm, + int flags, int mask)); + +#ifdef IFMEDIA_DEBUG +int ifmedia_debug = 0; +static void ifmedia_printword __P((int)); +#endif + +/* + * Initialize if_media struct for a specific interface instance. + */ +void +ifmedia_init(ifm, dontcare_mask, change_callback, status_callback) + struct ifmedia *ifm; + int dontcare_mask; + ifm_change_cb_t change_callback; + ifm_stat_cb_t status_callback; +{ + + LIST_INIT(&ifm->ifm_list); + ifm->ifm_cur = NULL; + ifm->ifm_media = 0; + ifm->ifm_mask = dontcare_mask; /* IF don't-care bits */ + ifm->ifm_change = change_callback; + ifm->ifm_status = status_callback; +} + +/* + * Add a media configuration to the list of supported media + * for a specific interface instance. + */ +void +ifmedia_add(ifm, mword, data, aux) + struct ifmedia *ifm; + int mword; + int data; + void *aux; +{ + register struct ifmedia_entry *entry; + +#ifdef IFMEDIA_DEBUG + if (ifmedia_debug) { + if (ifm == NULL) { + printf("ifmedia_add: null ifm\n"); + return; + } + printf("Adding entry for "); + ifmedia_printword(mword); + } +#endif + + entry = malloc(sizeof(*entry), M_IFADDR, M_NOWAIT); + if (entry == NULL) + panic("ifmedia_add: can't malloc entry"); + + entry->ifm_media = mword; + entry->ifm_data = data; + entry->ifm_aux = aux; + + LIST_INSERT_HEAD(&ifm->ifm_list, entry, ifm_list); +} + +/* + * Add an array of media configurations to the list of + * supported media for a specific interface instance. + */ +void +ifmedia_list_add(ifm, lp, count) + struct ifmedia *ifm; + struct ifmedia_entry *lp; + int count; +{ + int i; + + for (i = 0; i < count; i++) + ifmedia_add(ifm, lp[i].ifm_media, lp[i].ifm_data, + lp[i].ifm_aux); +} + +/* + * Set the default active media. + * + * Called by device-specific code which is assumed to have already + * selected the default media in hardware. We do _not_ call the + * media-change callback. + */ +void +ifmedia_set(ifm, target) + struct ifmedia *ifm; + int target; + +{ + struct ifmedia_entry *match; + + match = ifmedia_match(ifm, target, ifm->ifm_mask); + + if (match == NULL) { + printf("ifmedia_set: no match for 0x%x/0x%x\n", + target, ~ifm->ifm_mask); + panic("ifmedia_set"); + } + ifm->ifm_cur = match; + +#ifdef IFMEDIA_DEBUG + if (ifmedia_debug) { + printf("ifmedia_set: target "); + ifmedia_printword(target); + printf("ifmedia_set: setting to "); + ifmedia_printword(ifm->ifm_cur->ifm_media); + } +#endif +} + +/* + * Device-independent media ioctl support function. + */ +int +ifmedia_ioctl(ifp, ifr, ifm, cmd) + struct ifnet *ifp; + struct ifreq *ifr; + struct ifmedia *ifm; + u_long cmd; +{ + struct ifmedia_entry *match; + struct ifmediareq *ifmr = (struct ifmediareq *) ifr; + int error = 0, sticky; + + if (ifp == NULL || ifr == NULL || ifm == NULL) + return(EINVAL); + + switch (cmd) { + + /* + * Set the current media. + */ + case SIOCSIFMEDIA: + { + struct ifmedia_entry *oldentry; + int oldmedia; + int newmedia = ifr->ifr_media; + + match = ifmedia_match(ifm, newmedia, ifm->ifm_mask); + if (match == NULL) { +#ifdef IFMEDIA_DEBUG + if (ifmedia_debug) { + printf( + "ifmedia_ioctl: no media found for 0x%x\n", + newmedia); + } +#endif + return (ENXIO); + } + + /* + * If no change, we're done. + * XXX Automedia may invole software intervention. + * Keep going in case the the connected media changed. + * Similarly, if best match changed (kernel debugger?). + */ + if ((IFM_SUBTYPE(newmedia) != IFM_AUTO) && + (newmedia == ifm->ifm_media) && + (match == ifm->ifm_cur)) + return 0; + + /* + * We found a match, now make the driver switch to it. + * Make sure to preserve our old media type in case the + * driver can't switch. + */ +#ifdef IFMEDIA_DEBUG + if (ifmedia_debug) { + printf("ifmedia_ioctl: switching %s to ", + ifp->if_xname); + ifmedia_printword(match->ifm_media); + } +#endif + oldentry = ifm->ifm_cur; + oldmedia = ifm->ifm_media; + ifm->ifm_cur = match; + ifm->ifm_media = newmedia; + error = (*ifm->ifm_change)(ifp); + if (error) { + ifm->ifm_cur = oldentry; + ifm->ifm_media = oldmedia; + } + break; + } + + /* + * Get list of available media and current media on interface. + */ + case SIOCGIFMEDIA: + { + struct ifmedia_entry *ep; + int *kptr, count; + + kptr = NULL; /* XXX gcc */ + + ifmr->ifm_active = ifmr->ifm_current = ifm->ifm_cur ? + ifm->ifm_cur->ifm_media : IFM_NONE; + ifmr->ifm_mask = ifm->ifm_mask; + ifmr->ifm_status = 0; + (*ifm->ifm_status)(ifp, ifmr); + + count = 0; + ep = ifm->ifm_list.lh_first; + + if (ifmr->ifm_count != 0) { + kptr = (int *)malloc(ifmr->ifm_count * sizeof(int), + M_TEMP, M_WAITOK); + + /* + * Get the media words from the interface's list. + */ + for (; ep != NULL && count < ifmr->ifm_count; + ep = ep->ifm_list.le_next, count++) + kptr[count] = ep->ifm_media; + + if (ep != NULL) + error = E2BIG; /* oops! */ + } + + /* + * If there are more interfaces on the list, count + * them. This allows the caller to set ifmr->ifm_count + * to 0 on the first call to know how much space to + * callocate. + */ + for (; ep != NULL; ep = ep->ifm_list.le_next) + count++; + + /* + * We do the copyout on E2BIG, because that's + * just our way of telling userland that there + * are more. This is the behavior I've observed + * under BSD/OS 3.0 + */ + sticky = error; + if ((error == 0 || error == E2BIG) && ifmr->ifm_count != 0) { + error = copyout((caddr_t)kptr, + (caddr_t)ifmr->ifm_ulist, + ifmr->ifm_count * sizeof(int)); + } + + if (error == 0) + error = sticky; + + if (ifmr->ifm_count != 0) + free(kptr, M_TEMP); + + ifmr->ifm_count = count; + break; + } + + default: + return (EINVAL); + } + + return (error); +} + +/* + * Find media entry matching a given ifm word. + * + */ +struct ifmedia_entry * +ifmedia_match(ifm, target, mask) + struct ifmedia *ifm; + int target; + int mask; +{ + struct ifmedia_entry *match, *next; + + match = NULL; + mask = ~mask; + + for (next = ifm->ifm_list.lh_first; next != NULL; + next = next->ifm_list.le_next) { + if ((next->ifm_media & mask) == (target & mask)) { +#if defined(IFMEDIA_DEBUG) || defined(DIAGNOSTIC) + if (match) { + printf("ifmedia_match: multiple match for " + "0x%x/0x%x\n", target, mask); + } +#endif + match = next; + } + } + + return match; +} + +#ifdef IFMEDIA_DEBUG +struct ifmedia_description ifm_type_descriptions[] = + IFM_TYPE_DESCRIPTIONS; + +struct ifmedia_description ifm_subtype_ethernet_descriptions[] = + IFM_SUBTYPE_ETHERNET_DESCRIPTIONS; + +struct ifmedia_description ifm_subtype_ethernet_option_descriptions[] = + IFM_SUBTYPE_ETHERNET_OPTION_DESCRIPTIONS; + +struct ifmedia_description ifm_subtype_tokenring_descriptions[] = + IFM_SUBTYPE_TOKENRING_DESCRIPTIONS; + +struct ifmedia_description ifm_subtype_tokenring_option_descriptions[] = + IFM_SUBTYPE_TOKENRING_OPTION_DESCRIPTIONS; + +struct ifmedia_description ifm_subtype_fddi_descriptions[] = + IFM_SUBTYPE_FDDI_DESCRIPTIONS; + +struct ifmedia_description ifm_subtype_fddi_option_descriptions[] = + IFM_SUBTYPE_FDDI_OPTION_DESCRIPTIONS; + +struct ifmedia_description ifm_subtype_shared_descriptions[] = + IFM_SUBTYPE_SHARED_DESCRIPTIONS; + +struct ifmedia_description ifm_shared_option_descriptions[] = + IFM_SHARED_OPTION_DESCRIPTIONS; + +struct ifmedia_type_to_subtype { + struct ifmedia_description *subtypes; + struct ifmedia_description *options; +}; + +/* must be in the same order as IFM_TYPE_DESCRIPTIONS */ +struct ifmedia_type_to_subtype ifmedia_types_to_subtypes[] = { + { + &ifm_subtype_ethernet_descriptions[0], + &ifm_subtype_ethernet_option_descriptions[0] + }, + { + &ifm_subtype_tokenring_descriptions[0], + &ifm_subtype_tokenring_option_descriptions[0] + }, + { + &ifm_subtype_fddi_descriptions[0], + &ifm_subtype_fddi_option_descriptions[0] + }, +}; + +/* + * print a media word. + */ +static void +ifmedia_printword(ifmw) + int ifmw; +{ + struct ifmedia_description *desc; + struct ifmedia_type_to_subtype *ttos; + int seen_option = 0; + + /* Find the top-level interface type. */ + for (desc = ifm_type_descriptions, ttos = ifmedia_types_to_subtypes; + desc->ifmt_string != NULL; desc++, ttos++) + if (IFM_TYPE(ifmw) == desc->ifmt_word) + break; + if (desc->ifmt_string == NULL) { + printf("<unknown type>\n"); + return; + } + printf(desc->ifmt_string); + + /* + * Check for the shared subtype descriptions first, then the + * type-specific ones. + */ + for (desc = ifm_subtype_shared_descriptions; + desc->ifmt_string != NULL; desc++) + if (IFM_SUBTYPE(ifmw) == desc->ifmt_word) + goto got_subtype; + + for (desc = ttos->subtypes; desc->ifmt_string != NULL; desc++) + if (IFM_SUBTYPE(ifmw) == desc->ifmt_word) + break; + if (desc->ifmt_string == NULL) { + printf(" <unknown subtype>\n"); + return; + } + + got_subtype: + printf(" %s", desc->ifmt_string); + + /* + * Look for shared options. + */ + for (desc = ifm_shared_option_descriptions; + desc->ifmt_string != NULL; desc++) { + if (ifmw & desc->ifmt_word) { + if (seen_option == 0) + printf(" <"); + printf("%s%s", seen_option++ ? "," : "", + desc->ifmt_string); + } + } + + /* + * Look for subtype-specific options. + */ + for (desc = ttos->options; desc->ifmt_string != NULL; desc++) { + if (ifmw & desc->ifmt_word) { + if (seen_option == 0) + printf(" <"); + printf("%s%s", seen_option++ ? "," : "", + desc->ifmt_string); + } + } + printf("%s\n", seen_option ? ">" : ""); +} +#endif /* IFMEDIA_DEBUG */ |
