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Diffstat (limited to 'net/inet/dev.c')
| -rw-r--r-- | net/inet/dev.c | 1472 |
1 files changed, 1472 insertions, 0 deletions
diff --git a/net/inet/dev.c b/net/inet/dev.c new file mode 100644 index 000000000..973070388 --- /dev/null +++ b/net/inet/dev.c @@ -0,0 +1,1472 @@ +/* + * NET3 Protocol independent device support routines. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + * + * Derived from the non IP parts of dev.c 1.0.19 + * Authors: Ross Biro, <bir7@leland.Stanford.Edu> + * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> + * Mark Evans, <evansmp@uhura.aston.ac.uk> + * + * Additional Authors: + * Florian la Roche <rzsfl@rz.uni-sb.de> + * Alan Cox <gw4pts@gw4pts.ampr.org> + * David Hinds <dhinds@allegro.stanford.edu> + * + * Changes: + * Alan Cox : device private ioctl copies fields back. + * Alan Cox : Transmit queue code does relevant stunts to + * keep the queue safe. + * Alan Cox : Fixed double lock. + * Alan Cox : Fixed promisc NULL pointer trap + * + * Cleaned up and recommented by Alan Cox 2nd April 1994. I hope to have + * the rest as well commented in the end. + */ + +/* + * A lot of these includes will be going walkies very soon + */ + +#include <asm/segment.h> +#include <asm/system.h> +#include <asm/bitops.h> +#include <linux/config.h> +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/string.h> +#include <linux/mm.h> +#include <linux/socket.h> +#include <linux/sockios.h> +#include <linux/in.h> +#include <linux/errno.h> +#include <linux/interrupt.h> +#include <linux/if_ether.h> +#include <linux/inet.h> +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include "ip.h" +#include "route.h" +#include <linux/skbuff.h> +#include "sock.h" +#include "arp.h" + + +/* + * The list of packet types we will receive (as opposed to discard) + * and the routines to invoke. + */ + +struct packet_type *ptype_base = NULL; + +/* + * Device drivers call our routines to queue packets here. We empty the + * queue in the bottom half handler. + */ + +static struct sk_buff_head backlog = +{ + (struct sk_buff *)&backlog, (struct sk_buff *)&backlog +#ifdef CONFIG_SKB_CHECK + ,SK_HEAD_SKB +#endif +}; + +/* + * We don't overdo the queue or we will thrash memory badly. + */ + +static int backlog_size = 0; + +/* + * The number of sockets open for 'all' protocol use. We have to + * know this to copy a buffer the correct number of times. + */ + +static int dev_nit=0; + +/* + * Return the lesser of the two values. + */ + +static __inline__ unsigned long min(unsigned long a, unsigned long b) +{ + return (a < b)? a : b; +} + + +/****************************************************************************************** + + Protocol management and registration routines + +*******************************************************************************************/ + + +/* + * Add a protocol ID to the list. + */ + +void dev_add_pack(struct packet_type *pt) +{ + struct packet_type *p1; + pt->next = ptype_base; + + /* + * Don't use copy counts on ETH_P_ALL. Instead keep a global + * count of number of these and use it and pt->copy to decide + * copies + */ + + pt->copy=0; /* Assume we will not be copying the buffer before + * this routine gets it + */ + + if(pt->type == htons(ETH_P_ALL)) + dev_nit++; /* I'd like a /dev/nit too one day 8) */ + else + { + /* + * See if we need to copy it - that is another process also + * wishes to receive this type of packet. + */ + for (p1 = ptype_base; p1 != NULL; p1 = p1->next) + { + if (p1->type == pt->type) + { + pt->copy = 1; /* We will need to copy */ + break; + } + } + } + + /* + * NIT taps must go at the end or net_bh will leak! + */ + + if (pt->type == htons(ETH_P_ALL)) + { + pt->next=NULL; + if(ptype_base==NULL) + ptype_base=pt; + else + { + /* + * Move to the end of the list + */ + for(p1=ptype_base;p1->next!=NULL;p1=p1->next); + /* + * Hook on the end + */ + p1->next=pt; + } + } + else +/* + * It goes on the start + */ + ptype_base = pt; +} + + +/* + * Remove a protocol ID from the list. + */ + +void dev_remove_pack(struct packet_type *pt) +{ + struct packet_type *lpt, *pt1; + + /* + * Keep the count of nit (Network Interface Tap) sockets correct. + */ + + if (pt->type == htons(ETH_P_ALL)) + dev_nit--; + + /* + * If we are first, just unhook us. + */ + + if (pt == ptype_base) + { + ptype_base = pt->next; + return; + } + + lpt = NULL; + + /* + * This is harder. What we do is to walk the list of sockets + * for this type. We unhook the entry, and if there is a previous + * entry that is copying _and_ we are not copying, (ie we are the + * last entry for this type) then the previous one is set to + * non-copying as it is now the last. + */ + for (pt1 = ptype_base; pt1->next != NULL; pt1 = pt1->next) + { + if (pt1->next == pt ) + { + cli(); + if (!pt->copy && lpt) + lpt->copy = 0; + pt1->next = pt->next; + sti(); + return; + } + if (pt1->next->type == pt->type && pt->type != htons(ETH_P_ALL)) + lpt = pt1->next; + } +} + +/***************************************************************************************** + + Device Interface Subroutines + +******************************************************************************************/ + +/* + * Find an interface by name. + */ + +struct device *dev_get(char *name) +{ + struct device *dev; + + for (dev = dev_base; dev != NULL; dev = dev->next) + { + if (strcmp(dev->name, name) == 0) + return(dev); + } + return(NULL); +} + + +/* + * Prepare an interface for use. + */ + +int dev_open(struct device *dev) +{ + int ret = 0; + + /* + * Call device private open method + */ + if (dev->open) + ret = dev->open(dev); + + /* + * If it went open OK then set the flags + */ + + if (ret == 0) + dev->flags |= (IFF_UP | IFF_RUNNING); + + return(ret); +} + + +/* + * Completely shutdown an interface. + * + * WARNING: Both because of the way the upper layers work (that can be fixed) + * and because of races during a close (that can't be fixed any other way) + * a device may be given things to transmit EVEN WHEN IT IS DOWN. The driver + * MUST cope with this (eg by freeing and dumping the frame). + */ + +int dev_close(struct device *dev) +{ + /* + * Only close a device if it is up. + */ + + if (dev->flags != 0) + { + int ct=0; + dev->flags = 0; + /* + * Call the device specific close. This cannot fail. + */ + if (dev->stop) + dev->stop(dev); + /* + * Delete the route to the device. + */ +#ifdef CONFIG_INET + ip_rt_flush(dev); + arp_device_down(dev); +#endif +#ifdef CONFIG_IPX + ipxrtr_device_down(dev); +#endif + /* + * Blank the IP addresses + */ + dev->pa_addr = 0; + dev->pa_dstaddr = 0; + dev->pa_brdaddr = 0; + dev->pa_mask = 0; + /* + * Purge any queued packets when we down the link + */ + while(ct<DEV_NUMBUFFS) + { + struct sk_buff *skb; + while((skb=skb_dequeue(&dev->buffs[ct]))!=NULL) + if(skb->free) + kfree_skb(skb,FREE_WRITE); + ct++; + } + } + return(0); +} + + +/* + * Send (or queue for sending) a packet. + * + * IMPORTANT: When this is called to resend frames. The caller MUST + * already have locked the sk_buff. Apart from that we do the + * rest of the magic. + */ + +void dev_queue_xmit(struct sk_buff *skb, struct device *dev, int pri) +{ + unsigned long flags; + int nitcount; + struct packet_type *ptype; + int where = 0; /* used to say if the packet should go */ + /* at the front or the back of the */ + /* queue - front is a retransmit try */ + + if (dev == NULL) + { + printk("dev.c: dev_queue_xmit: dev = NULL\n"); + return; + } + + if(pri>=0 && !skb_device_locked(skb)) + skb_device_lock(skb); /* Shove a lock on the frame */ +#ifdef CONFIG_SLAVE_BALANCING + save_flags(flags); + cli(); + if(dev->slave!=NULL && dev->slave->pkt_queue < dev->pkt_queue && + (dev->slave->flags & IFF_UP)) + dev=dev->slave; + restore_flags(flags); +#endif + + IS_SKB(skb); + + skb->dev = dev; + + /* + * This just eliminates some race conditions, but not all... + */ + + if (skb->next != NULL) + { + /* + * Make sure we haven't missed an interrupt. + */ + printk("dev_queue_xmit: worked around a missed interrupt\n"); + dev->hard_start_xmit(NULL, dev); + return; + } + + /* + * Negative priority is used to flag a frame that is being pulled from the + * queue front as a retransmit attempt. It therefore goes back on the queue + * start on a failure. + */ + + if (pri < 0) + { + pri = -pri-1; + where = 1; + } + + if (pri >= DEV_NUMBUFFS) + { + printk("bad priority in dev_queue_xmit.\n"); + pri = 1; + } + + /* + * If the address has not been resolved. Call the device header rebuilder. + * This can cover all protocols and technically not just ARP either. + */ + + if (!skb->arp && dev->rebuild_header(skb->data, dev, skb->raddr, skb)) { + return; + } + + save_flags(flags); + cli(); + if (!where) { +#ifdef CONFIG_SLAVE_BALANCING + skb->in_dev_queue=1; +#endif + skb_queue_tail(dev->buffs + pri,skb); + skb_device_unlock(skb); /* Buffer is on the device queue and can be freed safely */ + skb = skb_dequeue(dev->buffs + pri); + skb_device_lock(skb); /* New buffer needs locking down */ +#ifdef CONFIG_SLAVE_BALANCING + skb->in_dev_queue=0; +#endif + } + restore_flags(flags); + + /* copy outgoing packets to any sniffer packet handlers */ + if(!where) + { + for (nitcount = dev_nit, ptype = ptype_base; nitcount > 0 && ptype != NULL; ptype = ptype->next) + { + if (ptype->type == htons(ETH_P_ALL)) { + struct sk_buff *skb2; + if ((skb2 = skb_clone(skb, GFP_ATOMIC)) == NULL) + break; + ptype->func(skb2, skb->dev, ptype); + nitcount--; + } + } + } + if (dev->hard_start_xmit(skb, dev) == 0) { + /* + * Packet is now solely the responsibility of the driver + */ + return; + } + + /* + * Transmission failed, put skb back into a list. Once on the list its safe and + * no longer device locked (it can be freed safely from the device queue) + */ + cli(); +#ifdef CONFIG_SLAVE_BALANCING + skb->in_dev_queue=1; + dev->pkt_queue++; +#endif + skb_device_unlock(skb); + skb_queue_head(dev->buffs + pri,skb); + restore_flags(flags); +} + +/* + * Receive a packet from a device driver and queue it for the upper + * (protocol) levels. It always succeeds. This is the recommended + * interface to use. + */ + +void netif_rx(struct sk_buff *skb) +{ + static int dropping = 0; + + /* + * Any received buffers are un-owned and should be discarded + * when freed. These will be updated later as the frames get + * owners. + */ + skb->sk = NULL; + skb->free = 1; + if(skb->stamp.tv_sec==0) + skb->stamp = xtime; + + /* + * Check that we aren't overdoing things. + */ + + if (!backlog_size) + dropping = 0; + else if (backlog_size > 100) + dropping = 1; + + if (dropping) + { + kfree_skb(skb, FREE_READ); + return; + } + + /* + * Add it to the "backlog" queue. + */ + + IS_SKB(skb); + skb_queue_tail(&backlog,skb); + backlog_size++; + + /* + * If any packet arrived, mark it for processing after the + * hardware interrupt returns. + */ + + mark_bh(NET_BH); + return; +} + + +/* + * The old interface to fetch a packet from a device driver. + * This function is the base level entry point for all drivers that + * want to send a packet to the upper (protocol) levels. It takes + * care of de-multiplexing the packet to the various modules based + * on their protocol ID. + * + * Return values: 1 <- exit I can't do any more + * 0 <- feed me more (i.e. "done", "OK"). + * + * This function is OBSOLETE and should not be used by any new + * device. + */ + +int dev_rint(unsigned char *buff, long len, int flags, struct device *dev) +{ + static int dropping = 0; + struct sk_buff *skb = NULL; + unsigned char *to; + int amount, left; + int len2; + + if (dev == NULL || buff == NULL || len <= 0) + return(1); + + if (flags & IN_SKBUFF) + { + skb = (struct sk_buff *) buff; + } + else + { + if (dropping) + { + if (skb_peek(&backlog) != NULL) + return(1); + printk("INET: dev_rint: no longer dropping packets.\n"); + dropping = 0; + } + + skb = alloc_skb(len, GFP_ATOMIC); + if (skb == NULL) + { + printk("dev_rint: packet dropped on %s (no memory) !\n", + dev->name); + dropping = 1; + return(1); + } + + /* + * First we copy the packet into a buffer, and save it for later. We + * in effect handle the incoming data as if it were from a circular buffer + */ + + to = skb->data; + left = len; + + len2 = len; + while (len2 > 0) + { + amount = min(len2, (unsigned long) dev->rmem_end - + (unsigned long) buff); + memcpy(to, buff, amount); + len2 -= amount; + left -= amount; + buff += amount; + to += amount; + if ((unsigned long) buff == dev->rmem_end) + buff = (unsigned char *) dev->rmem_start; + } + } + + /* + * Tag the frame and kick it to the proper receive routine + */ + + skb->len = len; + skb->dev = dev; + skb->free = 1; + + netif_rx(skb); + /* + * OK, all done. + */ + return(0); +} + + +/* + * This routine causes all interfaces to try to send some data. + */ + +void dev_transmit(void) +{ + struct device *dev; + + for (dev = dev_base; dev != NULL; dev = dev->next) + { + if (dev->flags != 0 && !dev->tbusy) { + /* + * Kick the device + */ + dev_tint(dev); + } + } +} + + +/********************************************************************************** + + Receive Queue Processor + +***********************************************************************************/ + +/* + * This is a single non-reentrant routine which takes the received packet + * queue and throws it at the networking layers in the hope that something + * useful will emerge. + */ + +volatile char in_bh = 0; /* Non-reentrant remember */ + +int in_net_bh() /* Used by timer.c */ +{ + return(in_bh==0?0:1); +} + +/* + * When we are called the queue is ready to grab, the interrupts are + * on and hardware can interrupt and queue to the receive queue a we + * run with no problems. + * This is run as a bottom half after an interrupt handler that does + * mark_bh(NET_BH); + */ + +void net_bh(void *tmp) +{ + struct sk_buff *skb; + struct packet_type *ptype; + unsigned short type; + unsigned char flag = 0; + int nitcount; + + /* + * Atomically check and mark our BUSY state. + */ + + if (set_bit(1, (void*)&in_bh)) + return; + + /* + * Can we send anything now? We want to clear the + * decks for any more sends that get done as we + * process the input. + */ + + dev_transmit(); + + /* + * Any data left to process. This may occur because a + * mark_bh() is done after we empty the queue including + * that from the device which does a mark_bh() just after + */ + + cli(); + + /* + * While the queue is not empty + */ + + while((skb=skb_dequeue(&backlog))!=NULL) + { + /* + * We have a packet. Therefore the queue has shrunk + */ + backlog_size--; + + nitcount=dev_nit; + flag=0; + sti(); + + /* + * Bump the pointer to the next structure. + * This assumes that the basic 'skb' pointer points to + * the MAC header, if any (as indicated by its "length" + * field). Take care now! + */ + + skb->h.raw = skb->data + skb->dev->hard_header_len; + skb->len -= skb->dev->hard_header_len; + + /* + * Fetch the packet protocol ID. This is also quite ugly, as + * it depends on the protocol driver (the interface itself) to + * know what the type is, or where to get it from. The Ethernet + * interfaces fetch the ID from the two bytes in the Ethernet MAC + * header (the h_proto field in struct ethhdr), but other drivers + * may either use the ethernet ID's or extra ones that do not + * clash (eg ETH_P_AX25). We could set this before we queue the + * frame. In fact I may change this when I have time. + */ + + type = skb->dev->type_trans(skb, skb->dev); + + /* + * We got a packet ID. Now loop over the "known protocols" + * table (which is actually a linked list, but this will + * change soon if I get my way- FvK), and forward the packet + * to anyone who wants it. + * + * [FvK didn't get his way but he is right this ought to be + * hashed so we typically get a single hit. The speed cost + * here is minimal but no doubt adds up at the 4,000+ pkts/second + * rate we can hit flat out] + */ + + for (ptype = ptype_base; ptype != NULL; ptype = ptype->next) + { + if (ptype->type == type || ptype->type == htons(ETH_P_ALL)) + { + struct sk_buff *skb2; + + if (ptype->type == htons(ETH_P_ALL)) + nitcount--; + if (ptype->copy || nitcount) + { + /* + * copy if we need to + */ +#ifdef OLD + skb2 = alloc_skb(skb->len, GFP_ATOMIC); + if (skb2 == NULL) + continue; + memcpy(skb2, skb, skb2->mem_len); + skb2->mem_addr = skb2; + skb2->h.raw = (unsigned char *)( + (unsigned long) skb2 + + (unsigned long) skb->h.raw - + (unsigned long) skb + ); + skb2->free = 1; +#else + skb2=skb_clone(skb, GFP_ATOMIC); + if(skb2==NULL) + continue; +#endif + } + else + { + skb2 = skb; + } + + /* + * Protocol located. + */ + + flag = 1; + + /* + * Kick the protocol handler. This should be fast + * and efficient code. + */ + + ptype->func(skb2, skb->dev, ptype); + } + } /* End of protocol list loop */ + + /* + * Has an unknown packet has been received ? + */ + + if (!flag) + { + kfree_skb(skb, FREE_WRITE); + } + + /* + * Again, see if we can transmit anything now. + */ + + dev_transmit(); + cli(); + } /* End of queue loop */ + + /* + * We have emptied the queue + */ + + in_bh = 0; + sti(); + + /* + * One last output flush. + */ + + dev_transmit(); +} + + +/* + * This routine is called when an device driver (i.e. an + * interface) is ready to transmit a packet. + */ + +void dev_tint(struct device *dev) +{ + int i; + struct sk_buff *skb; + unsigned long flags; + + save_flags(flags); + /* + * Work the queues in priority order + */ + + for(i = 0;i < DEV_NUMBUFFS; i++) + { + /* + * Pull packets from the queue + */ + + + cli(); + while((skb=skb_dequeue(&dev->buffs[i]))!=NULL) + { + /* + * Stop anyone freeing the buffer while we retransmit it + */ + skb_device_lock(skb); + restore_flags(flags); + /* + * Feed them to the output stage and if it fails + * indicate they re-queue at the front. + */ + dev_queue_xmit(skb,dev,-i - 1); + /* + * If we can take no more then stop here. + */ + if (dev->tbusy) + return; + cli(); + } + } + restore_flags(flags); +} + + +/* + * Perform a SIOCGIFCONF call. This structure will change + * size shortly, and there is nothing I can do about it. + * Thus we will need a 'compatibility mode'. + */ + +static int dev_ifconf(char *arg) +{ + struct ifconf ifc; + struct ifreq ifr; + struct device *dev; + char *pos; + int len; + int err; + + /* + * Fetch the caller's info block. + */ + + err=verify_area(VERIFY_WRITE, arg, sizeof(struct ifconf)); + if(err) + return err; + memcpy_fromfs(&ifc, arg, sizeof(struct ifconf)); + len = ifc.ifc_len; + pos = ifc.ifc_buf; + + /* + * We now walk the device list filling each active device + * into the array. + */ + + err=verify_area(VERIFY_WRITE,pos,len); + if(err) + return err; + + /* + * Loop over the interfaces, and write an info block for each. + */ + + for (dev = dev_base; dev != NULL; dev = dev->next) + { + if(!(dev->flags & IFF_UP)) /* Downed devices don't count */ + continue; + memset(&ifr, 0, sizeof(struct ifreq)); + strcpy(ifr.ifr_name, dev->name); + (*(struct sockaddr_in *) &ifr.ifr_addr).sin_family = dev->family; + (*(struct sockaddr_in *) &ifr.ifr_addr).sin_addr.s_addr = dev->pa_addr; + + /* + * Write this block to the caller's space. + */ + + memcpy_tofs(pos, &ifr, sizeof(struct ifreq)); + pos += sizeof(struct ifreq); + len -= sizeof(struct ifreq); + + /* + * Have we run out of space here ? + */ + + if (len < sizeof(struct ifreq)) + break; + } + + /* + * All done. Write the updated control block back to the caller. + */ + + ifc.ifc_len = (pos - ifc.ifc_buf); + ifc.ifc_req = (struct ifreq *) ifc.ifc_buf; + memcpy_tofs(arg, &ifc, sizeof(struct ifconf)); + + /* + * Report how much was filled in + */ + + return(pos - arg); +} + + +/* + * This is invoked by the /proc filesystem handler to display a device + * in detail. + */ + +static int sprintf_stats(char *buffer, struct device *dev) +{ + struct enet_statistics *stats = (dev->get_stats ? dev->get_stats(dev): NULL); + int size; + + if (stats) + size = sprintf(buffer, "%6s:%7d %4d %4d %4d %4d %8d %4d %4d %4d %5d %4d\n", + dev->name, + stats->rx_packets, stats->rx_errors, + stats->rx_dropped + stats->rx_missed_errors, + stats->rx_fifo_errors, + stats->rx_length_errors + stats->rx_over_errors + + stats->rx_crc_errors + stats->rx_frame_errors, + stats->tx_packets, stats->tx_errors, stats->tx_dropped, + stats->tx_fifo_errors, stats->collisions, + stats->tx_carrier_errors + stats->tx_aborted_errors + + stats->tx_window_errors + stats->tx_heartbeat_errors); + else + size = sprintf(buffer, "%6s: No statistics available.\n", dev->name); + + return size; +} + +/* + * Called from the PROCfs module. This now uses the new arbitrary sized /proc/net interface + * to create /proc/net/dev + */ + +int dev_get_info(char *buffer, char **start, off_t offset, int length) +{ + int len=0; + off_t begin=0; + off_t pos=0; + int size; + + struct device *dev; + + + size = sprintf(buffer, "Inter-| Receive | Transmit\n" + " face |packets errs drop fifo frame|packets errs drop fifo colls carrier\n"); + + pos+=size; + len+=size; + + + for (dev = dev_base; dev != NULL; dev = dev->next) + { + size = sprintf_stats(buffer+len, dev); + len+=size; + pos=begin+len; + + if(pos<offset) + { + len=0; + begin=pos; + } + if(pos>offset+length) + break; + } + + *start=buffer+(offset-begin); /* Start of wanted data */ + len-=(offset-begin); /* Start slop */ + if(len>length) + len=length; /* Ending slop */ + return len; +} + + +/* + * This checks bitmasks for the ioctl calls for devices. + */ + +static inline int bad_mask(unsigned long mask, unsigned long addr) +{ + if (addr & (mask = ~mask)) + return 1; + mask = ntohl(mask); + if (mask & (mask+1)) + return 1; + return 0; +} + +/* + * Perform the SIOCxIFxxx calls. + * + * The socket layer has seen an ioctl the address family thinks is + * for the device. At this point we get invoked to make a decision + */ + +static int dev_ifsioc(void *arg, unsigned int getset) +{ + struct ifreq ifr; + struct device *dev; + int ret; + + /* + * Fetch the caller's info block into kernel space + */ + + int err=verify_area(VERIFY_WRITE, arg, sizeof(struct ifreq)); + if(err) + return err; + + memcpy_fromfs(&ifr, arg, sizeof(struct ifreq)); + + /* + * See which interface the caller is talking about. + */ + + if ((dev = dev_get(ifr.ifr_name)) == NULL) + return(-ENODEV); + + switch(getset) + { + case SIOCGIFFLAGS: /* Get interface flags */ + ifr.ifr_flags = dev->flags; + memcpy_tofs(arg, &ifr, sizeof(struct ifreq)); + ret = 0; + break; + case SIOCSIFFLAGS: /* Set interface flags */ + { + int old_flags = dev->flags; +#ifdef CONFIG_SLAVE_BALANCING + if(dev->flags&IFF_SLAVE) + return -EBUSY; +#endif + dev->flags = ifr.ifr_flags & ( + IFF_UP | IFF_BROADCAST | IFF_DEBUG | IFF_LOOPBACK | + IFF_POINTOPOINT | IFF_NOTRAILERS | IFF_RUNNING | + IFF_NOARP | IFF_PROMISC | IFF_ALLMULTI | IFF_SLAVE | IFF_MASTER); +#ifdef CONFIG_SLAVE_BALANCING + if(!(dev->flags&IFF_MASTER) && dev->slave) + { + dev->slave->flags&=~IFF_SLAVE; + dev->slave=NULL; + } +#endif + + if( dev->set_multicast_list!=NULL) + { + + /* + * Has promiscuous mode been turned off + */ + + if ( (old_flags & IFF_PROMISC) && ((dev->flags & IFF_PROMISC) == 0)) + dev->set_multicast_list(dev,0,NULL); + + /* + * Has it been turned on + */ + + if ( (dev->flags & IFF_PROMISC) && ((old_flags & IFF_PROMISC) == 0)) + dev->set_multicast_list(dev,-1,NULL); + } + + /* + * Have we downed the interface + */ + + if ((old_flags & IFF_UP) && ((dev->flags & IFF_UP) == 0)) + { + ret = dev_close(dev); + } + else + { + /* + * Have we upped the interface + */ + + ret = (! (old_flags & IFF_UP) && (dev->flags & IFF_UP)) + ? dev_open(dev) : 0; + /* + * Check the flags. + */ + if(ret<0) + dev->flags&=~IFF_UP; /* Didn't open so down the if */ + } + } + break; + + case SIOCGIFADDR: /* Get interface address (and family) */ + (*(struct sockaddr_in *) + &ifr.ifr_addr).sin_addr.s_addr = dev->pa_addr; + (*(struct sockaddr_in *) + &ifr.ifr_addr).sin_family = dev->family; + (*(struct sockaddr_in *) + &ifr.ifr_addr).sin_port = 0; + memcpy_tofs(arg, &ifr, sizeof(struct ifreq)); + ret = 0; + break; + + case SIOCSIFADDR: /* Set interface address (and family) */ + dev->pa_addr = (*(struct sockaddr_in *) + &ifr.ifr_addr).sin_addr.s_addr; + dev->family = ifr.ifr_addr.sa_family; + +#ifdef CONFIG_INET + /* This is naughty. When net-032e comes out It wants moving into the net032 + code not the kernel. Till then it can sit here (SIGH) */ + dev->pa_mask = ip_get_mask(dev->pa_addr); +#endif + dev->pa_brdaddr = dev->pa_addr | ~dev->pa_mask; + ret = 0; + break; + + case SIOCGIFBRDADDR: /* Get the broadcast address */ + (*(struct sockaddr_in *) + &ifr.ifr_broadaddr).sin_addr.s_addr = dev->pa_brdaddr; + (*(struct sockaddr_in *) + &ifr.ifr_broadaddr).sin_family = dev->family; + (*(struct sockaddr_in *) + &ifr.ifr_broadaddr).sin_port = 0; + memcpy_tofs(arg, &ifr, sizeof(struct ifreq)); + ret = 0; + break; + + case SIOCSIFBRDADDR: /* Set the broadcast address */ + dev->pa_brdaddr = (*(struct sockaddr_in *) + &ifr.ifr_broadaddr).sin_addr.s_addr; + ret = 0; + break; + + case SIOCGIFDSTADDR: /* Get the destination address (for point-to-point links) */ + (*(struct sockaddr_in *) + &ifr.ifr_dstaddr).sin_addr.s_addr = dev->pa_dstaddr; + (*(struct sockaddr_in *) + &ifr.ifr_broadaddr).sin_family = dev->family; + (*(struct sockaddr_in *) + &ifr.ifr_broadaddr).sin_port = 0; + memcpy_tofs(arg, &ifr, sizeof(struct ifreq)); + ret = 0; + break; + + case SIOCSIFDSTADDR: /* Set the destination address (for point-to-point links) */ + dev->pa_dstaddr = (*(struct sockaddr_in *) + &ifr.ifr_dstaddr).sin_addr.s_addr; + ret = 0; + break; + + case SIOCGIFNETMASK: /* Get the netmask for the interface */ + (*(struct sockaddr_in *) + &ifr.ifr_netmask).sin_addr.s_addr = dev->pa_mask; + (*(struct sockaddr_in *) + &ifr.ifr_netmask).sin_family = dev->family; + (*(struct sockaddr_in *) + &ifr.ifr_netmask).sin_port = 0; + memcpy_tofs(arg, &ifr, sizeof(struct ifreq)); + ret = 0; + break; + + case SIOCSIFNETMASK: /* Set the netmask for the interface */ + { + unsigned long mask = (*(struct sockaddr_in *) + &ifr.ifr_netmask).sin_addr.s_addr; + ret = -EINVAL; + /* + * The mask we set must be legal. + */ + if (bad_mask(mask,0)) + break; + dev->pa_mask = mask; + ret = 0; + } + break; + + case SIOCGIFMETRIC: /* Get the metric on the interface (currently unused) */ + + ifr.ifr_metric = dev->metric; + memcpy_tofs(arg, &ifr, sizeof(struct ifreq)); + ret = 0; + break; + + case SIOCSIFMETRIC: /* Set the metric on the interface (currently unused) */ + dev->metric = ifr.ifr_metric; + ret = 0; + break; + + case SIOCGIFMTU: /* Get the MTU of a device */ + ifr.ifr_mtu = dev->mtu; + memcpy_tofs(arg, &ifr, sizeof(struct ifreq)); + ret = 0; + break; + + case SIOCSIFMTU: /* Set the MTU of a device */ + + /* + * MTU must be positive and under the page size problem + */ + + if(ifr.ifr_mtu<1 || ifr.ifr_mtu>3800) + return -EINVAL; + dev->mtu = ifr.ifr_mtu; + ret = 0; + break; + + case SIOCGIFMEM: /* Get the per device memory space. We can add this but currently + do not support it */ + printk("NET: ioctl(SIOCGIFMEM, 0x%08X)\n", (int)arg); + ret = -EINVAL; + break; + + case SIOCSIFMEM: /* Set the per device memory buffer space. Not applicable in our case */ + printk("NET: ioctl(SIOCSIFMEM, 0x%08X)\n", (int)arg); + ret = -EINVAL; + break; + + case OLD_SIOCGIFHWADDR: /* Get the hardware address. This will change and SIFHWADDR will be added */ + memcpy(ifr.old_ifr_hwaddr,dev->dev_addr, MAX_ADDR_LEN); + memcpy_tofs(arg,&ifr,sizeof(struct ifreq)); + ret=0; + break; + + case SIOCGIFHWADDR: + memcpy(ifr.ifr_hwaddr.sa_data,dev->dev_addr, MAX_ADDR_LEN); + ifr.ifr_hwaddr.sa_family=dev->type; + memcpy_tofs(arg,&ifr,sizeof(struct ifreq)); + ret=0; + break; + + case SIOCSIFHWADDR: + if(dev->set_mac_address==NULL) + return -EOPNOTSUPP; + if(ifr.ifr_hwaddr.sa_family!=dev->type) + return -EINVAL; + ret=dev->set_mac_address(dev,ifr.ifr_hwaddr.sa_data); + break; + + case SIOCGIFMAP: + ifr.ifr_map.mem_start=dev->mem_start; + ifr.ifr_map.mem_end=dev->mem_end; + ifr.ifr_map.base_addr=dev->base_addr; + ifr.ifr_map.irq=dev->irq; + ifr.ifr_map.dma=dev->dma; + ifr.ifr_map.port=dev->if_port; + memcpy_tofs(arg,&ifr,sizeof(struct ifreq)); + ret=0; + break; + + case SIOCSIFMAP: + if(dev->set_config==NULL) + return -EOPNOTSUPP; + return dev->set_config(dev,&ifr.ifr_map); + + case SIOCGIFSLAVE: +#ifdef CONFIG_SLAVE_BALANCING + if(dev->slave==NULL) + return -ENOENT; + strncpy(ifr.ifr_name,dev->name,sizeof(ifr.ifr_name)); + memcpy_tofs(arg,&ifr,sizeof(struct ifreq)); + ret=0; +#else + return -ENOENT; +#endif + break; +#ifdef CONFIG_SLAVE_BALANCING + case SIOCSIFSLAVE: + { + + /* + * Fun game. Get the device up and the flags right without + * letting some scummy user confuse us. + */ + unsigned long flags; + struct device *slave=dev_get(ifr.ifr_slave); + save_flags(flags); + if(slave==NULL) + { + return -ENODEV; + } + cli(); + if((slave->flags&(IFF_UP|IFF_RUNNING))!=(IFF_UP|IFF_RUNNING)) + { + restore_flags(flags); + return -EINVAL; + } + if(dev->flags&IFF_SLAVE) + { + restore_flags(flags); + return -EBUSY; + } + if(dev->slave!=NULL) + { + restore_flags(flags); + return -EBUSY; + } + if(slave->flags&IFF_SLAVE) + { + restore_flags(flags); + return -EBUSY; + } + dev->slave=slave; + slave->flags|=IFF_SLAVE; + dev->flags|=IFF_MASTER; + restore_flags(flags); + ret=0; + } + break; +#endif + /* + * Unknown or private ioctl + */ + + default: + if((getset >= SIOCDEVPRIVATE) && + (getset <= (SIOCDEVPRIVATE + 15))) { + if(dev->do_ioctl==NULL) + return -EOPNOTSUPP; + ret=dev->do_ioctl(dev, &ifr, getset); + memcpy_tofs(arg,&ifr,sizeof(struct ifreq)); + break; + } + + ret = -EINVAL; + } + return(ret); +} + + +/* + * This function handles all "interface"-type I/O control requests. The actual + * 'doing' part of this is dev_ifsioc above. + */ + +int dev_ioctl(unsigned int cmd, void *arg) +{ + switch(cmd) + { + case SIOCGIFCONF: + (void) dev_ifconf((char *) arg); + return 0; + + /* + * Ioctl calls that can be done by all. + */ + + case SIOCGIFFLAGS: + case SIOCGIFADDR: + case SIOCGIFDSTADDR: + case SIOCGIFBRDADDR: + case SIOCGIFNETMASK: + case SIOCGIFMETRIC: + case SIOCGIFMTU: + case SIOCGIFMEM: + case SIOCGIFHWADDR: + case SIOCSIFHWADDR: + case OLD_SIOCGIFHWADDR: + case SIOCGIFSLAVE: + case SIOCGIFMAP: + return dev_ifsioc(arg, cmd); + + /* + * Ioctl calls requiring the power of a superuser + */ + + case SIOCSIFFLAGS: + case SIOCSIFADDR: + case SIOCSIFDSTADDR: + case SIOCSIFBRDADDR: + case SIOCSIFNETMASK: + case SIOCSIFMETRIC: + case SIOCSIFMTU: + case SIOCSIFMEM: + case SIOCSIFMAP: + case SIOCSIFSLAVE: + if (!suser()) + return -EPERM; + return dev_ifsioc(arg, cmd); + + case SIOCSIFLINK: + return -EINVAL; + + /* + * Unknown or private ioctl. + */ + + default: + if((cmd >= SIOCDEVPRIVATE) && + (cmd <= (SIOCDEVPRIVATE + 15))) { + if (!suser()) + return -EPERM; + return dev_ifsioc(arg, cmd); + } + return -EINVAL; + } +} + + +/* + * Initialize the DEV module. At boot time this walks the device list and + * unhooks any devices that fail to initialise (normally hardware not + * present) and leaves us with a valid list of present and active devices. + * + * The PCMCIA code may need to change this a little, and add a pair + * of register_inet_device() unregister_inet_device() calls. This will be + * needed for ethernet as modules support. + */ + +void dev_init(void) +{ + struct device *dev, *dev2; + + /* + * Add the devices. + * If the call to dev->init fails, the dev is removed + * from the chain disconnecting the device until the + * next reboot. + */ + + dev2 = NULL; + for (dev = dev_base; dev != NULL; dev=dev->next) + { + if (dev->init && dev->init(dev)) + { + /* + * It failed to come up. Unhook it. + */ + + if (dev2 == NULL) + dev_base = dev->next; + else + dev2->next = dev->next; + } + else + { + dev2 = dev; + } + } +} |