diff options
Diffstat (limited to 'pfinet/linux-src/net/core/dev_mcast.c')
| -rw-r--r-- | pfinet/linux-src/net/core/dev_mcast.c | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/pfinet/linux-src/net/core/dev_mcast.c b/pfinet/linux-src/net/core/dev_mcast.c new file mode 100644 index 00000000..bce3f4a4 --- /dev/null +++ b/pfinet/linux-src/net/core/dev_mcast.c @@ -0,0 +1,252 @@ +/* + * Linux NET3: Multicast List maintenance. + * + * Authors: + * Tim Kordas <tjk@nostromo.eeap.cwru.edu> + * Richard Underwood <richard@wuzz.demon.co.uk> + * + * Stir fried together from the IP multicast and CAP patches above + * Alan Cox <Alan.Cox@linux.org> + * + * Fixes: + * Alan Cox : Update the device on a real delete + * rather than any time but... + * Alan Cox : IFF_ALLMULTI support. + * Alan Cox : New format set_multicast_list() calls. + * + * 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. + */ + +#include <linux/config.h> +#include <asm/uaccess.h> +#include <asm/system.h> +#include <asm/bitops.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 <linux/proc_fs.h> +#include <linux/init.h> +#include <net/ip.h> +#include <net/route.h> +#include <linux/skbuff.h> +#include <net/sock.h> +#include <net/arp.h> + + +/* + * Device multicast list maintenance. + * + * This is used both by IP and by the user level maintenance functions. + * Unlike BSD we maintain a usage count on a given multicast address so + * that a casual user application can add/delete multicasts used by + * protocols without doing damage to the protocols when it deletes the + * entries. It also helps IP as it tracks overlapping maps. + * + * Device mc lists are changed by bh at least if IPv6 is enabled, + * so that it must be bh protected. + */ + +/* + * Update the multicast list into the physical NIC controller. + */ + +void dev_mc_upload(struct device *dev) +{ + /* Don't do anything till we up the interface + [dev_open will call this function so the list will + stay sane] */ + + if(!(dev->flags&IFF_UP)) + return; + + /* + * Devices with no set multicast don't get set + */ + + if(dev->set_multicast_list==NULL) + return; + + start_bh_atomic(); + dev->set_multicast_list(dev); + end_bh_atomic(); +} + +/* + * Delete a device level multicast + */ + +int dev_mc_delete(struct device *dev, void *addr, int alen, int glbl) +{ + int err = 0; + struct dev_mc_list *dmi, **dmip; + + start_bh_atomic(); + for (dmip=&dev->mc_list; (dmi=*dmip)!=NULL; dmip=&dmi->next) { + /* + * Find the entry we want to delete. The device could + * have variable length entries so check these too. + */ + if (memcmp(dmi->dmi_addr,addr,dmi->dmi_addrlen)==0 && alen==dmi->dmi_addrlen) { + if (glbl) { + int old_glbl = dmi->dmi_gusers; + dmi->dmi_gusers = 0; + if (old_glbl == 0) + break; + } + if(--dmi->dmi_users) + goto done; + + /* + * Last user. So delete the entry. + */ + *dmip = dmi->next; + dev->mc_count--; + kfree_s(dmi,sizeof(*dmi)); + /* + * We have altered the list, so the card + * loaded filter is now wrong. Fix it + */ + end_bh_atomic(); + dev_mc_upload(dev); + return 0; + } + } + err = -ENOENT; +done: + end_bh_atomic(); + return err; +} + +/* + * Add a device level multicast + */ + +int dev_mc_add(struct device *dev, void *addr, int alen, int glbl) +{ + int err = 0; + struct dev_mc_list *dmi, *dmi1; + + dmi1 = (struct dev_mc_list *)kmalloc(sizeof(*dmi), gfp_any()); + + start_bh_atomic(); + for(dmi=dev->mc_list; dmi!=NULL; dmi=dmi->next) { + if (memcmp(dmi->dmi_addr,addr,dmi->dmi_addrlen)==0 && dmi->dmi_addrlen==alen) { + if (glbl) { + int old_glbl = dmi->dmi_gusers; + dmi->dmi_gusers = 1; + if (old_glbl) + goto done; + } + dmi->dmi_users++; + goto done; + } + } + + if ((dmi=dmi1)==NULL) + return -ENOMEM; + memcpy(dmi->dmi_addr, addr, alen); + dmi->dmi_addrlen=alen; + dmi->next=dev->mc_list; + dmi->dmi_users=1; + dmi->dmi_gusers=glbl ? 1 : 0; + dev->mc_list=dmi; + dev->mc_count++; + end_bh_atomic(); + dev_mc_upload(dev); + return 0; + +done: + end_bh_atomic(); + if (dmi1) + kfree(dmi1); + return err; +} + +/* + * Discard multicast list when a device is downed + */ + +void dev_mc_discard(struct device *dev) +{ + start_bh_atomic(); + while (dev->mc_list!=NULL) { + struct dev_mc_list *tmp=dev->mc_list; + dev->mc_list=tmp->next; + if (tmp->dmi_users > tmp->dmi_gusers) + printk("dev_mc_discard: multicast leakage! dmi_users=%d\n", tmp->dmi_users); + kfree_s(tmp,sizeof(*tmp)); + } + dev->mc_count=0; + end_bh_atomic(); +} + +#ifdef CONFIG_PROC_FS +static int dev_mc_read_proc(char *buffer, char **start, off_t offset, + int length, int *eof, void *data) +{ + off_t pos=0, begin=0; + struct dev_mc_list *m; + int len=0; + struct device *dev; + + start_bh_atomic(); + + for (dev = dev_base; dev; dev = dev->next) { + for (m = dev->mc_list; m; m = m->next) { + int i; + + len += sprintf(buffer+len,"%-4d %-15s %-5d %-5d ", dev->ifindex, dev->name, + m->dmi_users, m->dmi_gusers); + + for (i=0; i<m->dmi_addrlen; i++) + len += sprintf(buffer+len, "%02x", m->dmi_addr[i]); + + len+=sprintf(buffer+len, "\n"); + + pos=begin+len; + if (pos < offset) { + len=0; + begin=pos; + } + if (pos > offset+length) + goto done; + } + } + *eof = 1; + +done: + end_bh_atomic(); + *start=buffer+(offset-begin); + len-=(offset-begin); + if(len>length) + len=length; + if(len<0) + len=0; + return len; +} +#endif + +__initfunc(void dev_mcast_init(void)) +{ +#ifdef CONFIG_PROC_FS + struct proc_dir_entry *ent; + + ent = create_proc_entry("net/dev_mcast", 0, 0); + ent->read_proc = dev_mc_read_proc; +#endif +} + |