| /* |
| * Linux IPv6 multicast routing support for BSD pim6sd |
| * Based on net/ipv4/ipmr.c. |
| * |
| * (c) 2004 Mickael Hoerdt, <hoerdt@clarinet.u-strasbg.fr> |
| * LSIIT Laboratory, Strasbourg, France |
| * (c) 2004 Jean-Philippe Andriot, <jean-philippe.andriot@6WIND.com> |
| * 6WIND, Paris, France |
| * Copyright (C)2007,2008 USAGI/WIDE Project |
| * YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> |
| * |
| * 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 <asm/system.h> |
| #include <asm/uaccess.h> |
| #include <linux/types.h> |
| #include <linux/sched.h> |
| #include <linux/errno.h> |
| #include <linux/timer.h> |
| #include <linux/mm.h> |
| #include <linux/kernel.h> |
| #include <linux/fcntl.h> |
| #include <linux/stat.h> |
| #include <linux/socket.h> |
| #include <linux/inet.h> |
| #include <linux/netdevice.h> |
| #include <linux/inetdevice.h> |
| #include <linux/proc_fs.h> |
| #include <linux/seq_file.h> |
| #include <linux/init.h> |
| #include <net/protocol.h> |
| #include <linux/skbuff.h> |
| #include <net/sock.h> |
| #include <net/raw.h> |
| #include <linux/notifier.h> |
| #include <linux/if_arp.h> |
| #include <net/checksum.h> |
| #include <net/netlink.h> |
| |
| #include <net/ipv6.h> |
| #include <net/ip6_route.h> |
| #include <linux/mroute6.h> |
| #include <linux/pim.h> |
| #include <net/addrconf.h> |
| #include <linux/netfilter_ipv6.h> |
| |
| struct sock *mroute6_socket; |
| |
| |
| /* Big lock, protecting vif table, mrt cache and mroute socket state. |
| Note that the changes are semaphored via rtnl_lock. |
| */ |
| |
| static DEFINE_RWLOCK(mrt_lock); |
| |
| /* |
| * Multicast router control variables |
| */ |
| |
| static struct mif_device vif6_table[MAXMIFS]; /* Devices */ |
| static int maxvif; |
| |
| #define MIF_EXISTS(idx) (vif6_table[idx].dev != NULL) |
| |
| static int mroute_do_assert; /* Set in PIM assert */ |
| #ifdef CONFIG_IPV6_PIMSM_V2 |
| static int mroute_do_pim; |
| #else |
| #define mroute_do_pim 0 |
| #endif |
| |
| static struct mfc6_cache *mfc6_cache_array[MFC6_LINES]; /* Forwarding cache */ |
| |
| static struct mfc6_cache *mfc_unres_queue; /* Queue of unresolved entries */ |
| static atomic_t cache_resolve_queue_len; /* Size of unresolved */ |
| |
| /* Special spinlock for queue of unresolved entries */ |
| static DEFINE_SPINLOCK(mfc_unres_lock); |
| |
| /* We return to original Alan's scheme. Hash table of resolved |
| entries is changed only in process context and protected |
| with weak lock mrt_lock. Queue of unresolved entries is protected |
| with strong spinlock mfc_unres_lock. |
| |
| In this case data path is free of exclusive locks at all. |
| */ |
| |
| static struct kmem_cache *mrt_cachep __read_mostly; |
| |
| static int ip6_mr_forward(struct sk_buff *skb, struct mfc6_cache *cache); |
| static int ip6mr_cache_report(struct sk_buff *pkt, mifi_t mifi, int assert); |
| static int ip6mr_fill_mroute(struct sk_buff *skb, struct mfc6_cache *c, struct rtmsg *rtm); |
| |
| #ifdef CONFIG_IPV6_PIMSM_V2 |
| static struct inet6_protocol pim6_protocol; |
| #endif |
| |
| static struct timer_list ipmr_expire_timer; |
| |
| |
| #ifdef CONFIG_PROC_FS |
| |
| struct ipmr_mfc_iter { |
| struct mfc6_cache **cache; |
| int ct; |
| }; |
| |
| |
| static struct mfc6_cache *ipmr_mfc_seq_idx(struct ipmr_mfc_iter *it, loff_t pos) |
| { |
| struct mfc6_cache *mfc; |
| |
| it->cache = mfc6_cache_array; |
| read_lock(&mrt_lock); |
| for (it->ct = 0; it->ct < ARRAY_SIZE(mfc6_cache_array); it->ct++) |
| for (mfc = mfc6_cache_array[it->ct]; mfc; mfc = mfc->next) |
| if (pos-- == 0) |
| return mfc; |
| read_unlock(&mrt_lock); |
| |
| it->cache = &mfc_unres_queue; |
| spin_lock_bh(&mfc_unres_lock); |
| for (mfc = mfc_unres_queue; mfc; mfc = mfc->next) |
| if (pos-- == 0) |
| return mfc; |
| spin_unlock_bh(&mfc_unres_lock); |
| |
| it->cache = NULL; |
| return NULL; |
| } |
| |
| |
| |
| |
| /* |
| * The /proc interfaces to multicast routing /proc/ip6_mr_cache /proc/ip6_mr_vif |
| */ |
| |
| struct ipmr_vif_iter { |
| int ct; |
| }; |
| |
| static struct mif_device *ip6mr_vif_seq_idx(struct ipmr_vif_iter *iter, |
| loff_t pos) |
| { |
| for (iter->ct = 0; iter->ct < maxvif; ++iter->ct) { |
| if (!MIF_EXISTS(iter->ct)) |
| continue; |
| if (pos-- == 0) |
| return &vif6_table[iter->ct]; |
| } |
| return NULL; |
| } |
| |
| static void *ip6mr_vif_seq_start(struct seq_file *seq, loff_t *pos) |
| __acquires(mrt_lock) |
| { |
| read_lock(&mrt_lock); |
| return (*pos ? ip6mr_vif_seq_idx(seq->private, *pos - 1) |
| : SEQ_START_TOKEN); |
| } |
| |
| static void *ip6mr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| { |
| struct ipmr_vif_iter *iter = seq->private; |
| |
| ++*pos; |
| if (v == SEQ_START_TOKEN) |
| return ip6mr_vif_seq_idx(iter, 0); |
| |
| while (++iter->ct < maxvif) { |
| if (!MIF_EXISTS(iter->ct)) |
| continue; |
| return &vif6_table[iter->ct]; |
| } |
| return NULL; |
| } |
| |
| static void ip6mr_vif_seq_stop(struct seq_file *seq, void *v) |
| __releases(mrt_lock) |
| { |
| read_unlock(&mrt_lock); |
| } |
| |
| static int ip6mr_vif_seq_show(struct seq_file *seq, void *v) |
| { |
| if (v == SEQ_START_TOKEN) { |
| seq_puts(seq, |
| "Interface BytesIn PktsIn BytesOut PktsOut Flags\n"); |
| } else { |
| const struct mif_device *vif = v; |
| const char *name = vif->dev ? vif->dev->name : "none"; |
| |
| seq_printf(seq, |
| "%2td %-10s %8ld %7ld %8ld %7ld %05X\n", |
| vif - vif6_table, |
| name, vif->bytes_in, vif->pkt_in, |
| vif->bytes_out, vif->pkt_out, |
| vif->flags); |
| } |
| return 0; |
| } |
| |
| static struct seq_operations ip6mr_vif_seq_ops = { |
| .start = ip6mr_vif_seq_start, |
| .next = ip6mr_vif_seq_next, |
| .stop = ip6mr_vif_seq_stop, |
| .show = ip6mr_vif_seq_show, |
| }; |
| |
| static int ip6mr_vif_open(struct inode *inode, struct file *file) |
| { |
| return seq_open_private(file, &ip6mr_vif_seq_ops, |
| sizeof(struct ipmr_vif_iter)); |
| } |
| |
| static struct file_operations ip6mr_vif_fops = { |
| .owner = THIS_MODULE, |
| .open = ip6mr_vif_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = seq_release, |
| }; |
| |
| static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) |
| { |
| return (*pos ? ipmr_mfc_seq_idx(seq->private, *pos - 1) |
| : SEQ_START_TOKEN); |
| } |
| |
| static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| { |
| struct mfc6_cache *mfc = v; |
| struct ipmr_mfc_iter *it = seq->private; |
| |
| ++*pos; |
| |
| if (v == SEQ_START_TOKEN) |
| return ipmr_mfc_seq_idx(seq->private, 0); |
| |
| if (mfc->next) |
| return mfc->next; |
| |
| if (it->cache == &mfc_unres_queue) |
| goto end_of_list; |
| |
| BUG_ON(it->cache != mfc6_cache_array); |
| |
| while (++it->ct < ARRAY_SIZE(mfc6_cache_array)) { |
| mfc = mfc6_cache_array[it->ct]; |
| if (mfc) |
| return mfc; |
| } |
| |
| /* exhausted cache_array, show unresolved */ |
| read_unlock(&mrt_lock); |
| it->cache = &mfc_unres_queue; |
| it->ct = 0; |
| |
| spin_lock_bh(&mfc_unres_lock); |
| mfc = mfc_unres_queue; |
| if (mfc) |
| return mfc; |
| |
| end_of_list: |
| spin_unlock_bh(&mfc_unres_lock); |
| it->cache = NULL; |
| |
| return NULL; |
| } |
| |
| static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v) |
| { |
| struct ipmr_mfc_iter *it = seq->private; |
| |
| if (it->cache == &mfc_unres_queue) |
| spin_unlock_bh(&mfc_unres_lock); |
| else if (it->cache == mfc6_cache_array) |
| read_unlock(&mrt_lock); |
| } |
| |
| static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) |
| { |
| int n; |
| |
| if (v == SEQ_START_TOKEN) { |
| seq_puts(seq, |
| "Group " |
| "Origin " |
| "Iif Pkts Bytes Wrong Oifs\n"); |
| } else { |
| const struct mfc6_cache *mfc = v; |
| const struct ipmr_mfc_iter *it = seq->private; |
| |
| seq_printf(seq, |
| NIP6_FMT " " NIP6_FMT " %-3d %8ld %8ld %8ld", |
| NIP6(mfc->mf6c_mcastgrp), NIP6(mfc->mf6c_origin), |
| mfc->mf6c_parent, |
| mfc->mfc_un.res.pkt, |
| mfc->mfc_un.res.bytes, |
| mfc->mfc_un.res.wrong_if); |
| |
| if (it->cache != &mfc_unres_queue) { |
| for (n = mfc->mfc_un.res.minvif; |
| n < mfc->mfc_un.res.maxvif; n++) { |
| if (MIF_EXISTS(n) && |
| mfc->mfc_un.res.ttls[n] < 255) |
| seq_printf(seq, |
| " %2d:%-3d", |
| n, mfc->mfc_un.res.ttls[n]); |
| } |
| } |
| seq_putc(seq, '\n'); |
| } |
| return 0; |
| } |
| |
| static struct seq_operations ipmr_mfc_seq_ops = { |
| .start = ipmr_mfc_seq_start, |
| .next = ipmr_mfc_seq_next, |
| .stop = ipmr_mfc_seq_stop, |
| .show = ipmr_mfc_seq_show, |
| }; |
| |
| static int ipmr_mfc_open(struct inode *inode, struct file *file) |
| { |
| return seq_open_private(file, &ipmr_mfc_seq_ops, |
| sizeof(struct ipmr_mfc_iter)); |
| } |
| |
| static struct file_operations ip6mr_mfc_fops = { |
| .owner = THIS_MODULE, |
| .open = ipmr_mfc_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = seq_release, |
| }; |
| #endif |
| |
| #ifdef CONFIG_IPV6_PIMSM_V2 |
| static int reg_vif_num = -1; |
| |
| static int pim6_rcv(struct sk_buff *skb) |
| { |
| struct pimreghdr *pim; |
| struct ipv6hdr *encap; |
| struct net_device *reg_dev = NULL; |
| |
| if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap))) |
| goto drop; |
| |
| pim = (struct pimreghdr *)skb_transport_header(skb); |
| if (pim->type != ((PIM_VERSION << 4) | PIM_REGISTER) || |
| (pim->flags & PIM_NULL_REGISTER) || |
| (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 && |
| csum_fold(skb_checksum(skb, 0, skb->len, 0)))) |
| goto drop; |
| |
| /* check if the inner packet is destined to mcast group */ |
| encap = (struct ipv6hdr *)(skb_transport_header(skb) + |
| sizeof(*pim)); |
| |
| if (!ipv6_addr_is_multicast(&encap->daddr) || |
| encap->payload_len == 0 || |
| ntohs(encap->payload_len) + sizeof(*pim) > skb->len) |
| goto drop; |
| |
| read_lock(&mrt_lock); |
| if (reg_vif_num >= 0) |
| reg_dev = vif6_table[reg_vif_num].dev; |
| if (reg_dev) |
| dev_hold(reg_dev); |
| read_unlock(&mrt_lock); |
| |
| if (reg_dev == NULL) |
| goto drop; |
| |
| skb->mac_header = skb->network_header; |
| skb_pull(skb, (u8 *)encap - skb->data); |
| skb_reset_network_header(skb); |
| skb->dev = reg_dev; |
| skb->protocol = htons(ETH_P_IP); |
| skb->ip_summed = 0; |
| skb->pkt_type = PACKET_HOST; |
| dst_release(skb->dst); |
| reg_dev->stats.rx_bytes += skb->len; |
| reg_dev->stats.rx_packets++; |
| skb->dst = NULL; |
| nf_reset(skb); |
| netif_rx(skb); |
| dev_put(reg_dev); |
| return 0; |
| drop: |
| kfree_skb(skb); |
| return 0; |
| } |
| |
| static struct inet6_protocol pim6_protocol = { |
| .handler = pim6_rcv, |
| }; |
| |
| /* Service routines creating virtual interfaces: PIMREG */ |
| |
| static int reg_vif_xmit(struct sk_buff *skb, struct net_device *dev) |
| { |
| read_lock(&mrt_lock); |
| dev->stats.tx_bytes += skb->len; |
| dev->stats.tx_packets++; |
| ip6mr_cache_report(skb, reg_vif_num, MRT6MSG_WHOLEPKT); |
| read_unlock(&mrt_lock); |
| kfree_skb(skb); |
| return 0; |
| } |
| |
| static void reg_vif_setup(struct net_device *dev) |
| { |
| dev->type = ARPHRD_PIMREG; |
| dev->mtu = 1500 - sizeof(struct ipv6hdr) - 8; |
| dev->flags = IFF_NOARP; |
| dev->hard_start_xmit = reg_vif_xmit; |
| dev->destructor = free_netdev; |
| } |
| |
| static struct net_device *ip6mr_reg_vif(void) |
| { |
| struct net_device *dev; |
| |
| dev = alloc_netdev(0, "pim6reg", reg_vif_setup); |
| if (dev == NULL) |
| return NULL; |
| |
| if (register_netdevice(dev)) { |
| free_netdev(dev); |
| return NULL; |
| } |
| dev->iflink = 0; |
| |
| if (dev_open(dev)) |
| goto failure; |
| |
| return dev; |
| |
| failure: |
| /* allow the register to be completed before unregistering. */ |
| rtnl_unlock(); |
| rtnl_lock(); |
| |
| unregister_netdevice(dev); |
| return NULL; |
| } |
| #endif |
| |
| /* |
| * Delete a VIF entry |
| */ |
| |
| static int mif6_delete(int vifi) |
| { |
| struct mif_device *v; |
| struct net_device *dev; |
| if (vifi < 0 || vifi >= maxvif) |
| return -EADDRNOTAVAIL; |
| |
| v = &vif6_table[vifi]; |
| |
| write_lock_bh(&mrt_lock); |
| dev = v->dev; |
| v->dev = NULL; |
| |
| if (!dev) { |
| write_unlock_bh(&mrt_lock); |
| return -EADDRNOTAVAIL; |
| } |
| |
| #ifdef CONFIG_IPV6_PIMSM_V2 |
| if (vifi == reg_vif_num) |
| reg_vif_num = -1; |
| #endif |
| |
| if (vifi + 1 == maxvif) { |
| int tmp; |
| for (tmp = vifi - 1; tmp >= 0; tmp--) { |
| if (MIF_EXISTS(tmp)) |
| break; |
| } |
| maxvif = tmp + 1; |
| } |
| |
| write_unlock_bh(&mrt_lock); |
| |
| dev_set_allmulti(dev, -1); |
| |
| if (v->flags & MIFF_REGISTER) |
| unregister_netdevice(dev); |
| |
| dev_put(dev); |
| return 0; |
| } |
| |
| /* Destroy an unresolved cache entry, killing queued skbs |
| and reporting error to netlink readers. |
| */ |
| |
| static void ip6mr_destroy_unres(struct mfc6_cache *c) |
| { |
| struct sk_buff *skb; |
| |
| atomic_dec(&cache_resolve_queue_len); |
| |
| while((skb = skb_dequeue(&c->mfc_un.unres.unresolved)) != NULL) { |
| if (ipv6_hdr(skb)->version == 0) { |
| struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr)); |
| nlh->nlmsg_type = NLMSG_ERROR; |
| nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); |
| skb_trim(skb, nlh->nlmsg_len); |
| ((struct nlmsgerr *)NLMSG_DATA(nlh))->error = -ETIMEDOUT; |
| rtnl_unicast(skb, &init_net, NETLINK_CB(skb).pid); |
| } else |
| kfree_skb(skb); |
| } |
| |
| kmem_cache_free(mrt_cachep, c); |
| } |
| |
| |
| /* Single timer process for all the unresolved queue. */ |
| |
| static void ipmr_do_expire_process(unsigned long dummy) |
| { |
| unsigned long now = jiffies; |
| unsigned long expires = 10 * HZ; |
| struct mfc6_cache *c, **cp; |
| |
| cp = &mfc_unres_queue; |
| |
| while ((c = *cp) != NULL) { |
| if (time_after(c->mfc_un.unres.expires, now)) { |
| /* not yet... */ |
| unsigned long interval = c->mfc_un.unres.expires - now; |
| if (interval < expires) |
| expires = interval; |
| cp = &c->next; |
| continue; |
| } |
| |
| *cp = c->next; |
| ip6mr_destroy_unres(c); |
| } |
| |
| if (atomic_read(&cache_resolve_queue_len)) |
| mod_timer(&ipmr_expire_timer, jiffies + expires); |
| } |
| |
| static void ipmr_expire_process(unsigned long dummy) |
| { |
| if (!spin_trylock(&mfc_unres_lock)) { |
| mod_timer(&ipmr_expire_timer, jiffies + 1); |
| return; |
| } |
| |
| if (atomic_read(&cache_resolve_queue_len)) |
| ipmr_do_expire_process(dummy); |
| |
| spin_unlock(&mfc_unres_lock); |
| } |
| |
| /* Fill oifs list. It is called under write locked mrt_lock. */ |
| |
| static void ip6mr_update_thresholds(struct mfc6_cache *cache, unsigned char *ttls) |
| { |
| int vifi; |
| |
| cache->mfc_un.res.minvif = MAXMIFS; |
| cache->mfc_un.res.maxvif = 0; |
| memset(cache->mfc_un.res.ttls, 255, MAXMIFS); |
| |
| for (vifi = 0; vifi < maxvif; vifi++) { |
| if (MIF_EXISTS(vifi) && ttls[vifi] && ttls[vifi] < 255) { |
| cache->mfc_un.res.ttls[vifi] = ttls[vifi]; |
| if (cache->mfc_un.res.minvif > vifi) |
| cache->mfc_un.res.minvif = vifi; |
| if (cache->mfc_un.res.maxvif <= vifi) |
| cache->mfc_un.res.maxvif = vifi + 1; |
| } |
| } |
| } |
| |
| static int mif6_add(struct mif6ctl *vifc, int mrtsock) |
| { |
| int vifi = vifc->mif6c_mifi; |
| struct mif_device *v = &vif6_table[vifi]; |
| struct net_device *dev; |
| |
| /* Is vif busy ? */ |
| if (MIF_EXISTS(vifi)) |
| return -EADDRINUSE; |
| |
| switch (vifc->mif6c_flags) { |
| #ifdef CONFIG_IPV6_PIMSM_V2 |
| case MIFF_REGISTER: |
| /* |
| * Special Purpose VIF in PIM |
| * All the packets will be sent to the daemon |
| */ |
| if (reg_vif_num >= 0) |
| return -EADDRINUSE; |
| dev = ip6mr_reg_vif(); |
| if (!dev) |
| return -ENOBUFS; |
| break; |
| #endif |
| case 0: |
| dev = dev_get_by_index(&init_net, vifc->mif6c_pifi); |
| if (!dev) |
| return -EADDRNOTAVAIL; |
| dev_put(dev); |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| dev_set_allmulti(dev, 1); |
| |
| /* |
| * Fill in the VIF structures |
| */ |
| v->rate_limit = vifc->vifc_rate_limit; |
| v->flags = vifc->mif6c_flags; |
| if (!mrtsock) |
| v->flags |= VIFF_STATIC; |
| v->threshold = vifc->vifc_threshold; |
| v->bytes_in = 0; |
| v->bytes_out = 0; |
| v->pkt_in = 0; |
| v->pkt_out = 0; |
| v->link = dev->ifindex; |
| if (v->flags & MIFF_REGISTER) |
| v->link = dev->iflink; |
| |
| /* And finish update writing critical data */ |
| write_lock_bh(&mrt_lock); |
| dev_hold(dev); |
| v->dev = dev; |
| #ifdef CONFIG_IPV6_PIMSM_V2 |
| if (v->flags & MIFF_REGISTER) |
| reg_vif_num = vifi; |
| #endif |
| if (vifi + 1 > maxvif) |
| maxvif = vifi + 1; |
| write_unlock_bh(&mrt_lock); |
| return 0; |
| } |
| |
| static struct mfc6_cache *ip6mr_cache_find(struct in6_addr *origin, struct in6_addr *mcastgrp) |
| { |
| int line = MFC6_HASH(mcastgrp, origin); |
| struct mfc6_cache *c; |
| |
| for (c = mfc6_cache_array[line]; c; c = c->next) { |
| if (ipv6_addr_equal(&c->mf6c_origin, origin) && |
| ipv6_addr_equal(&c->mf6c_mcastgrp, mcastgrp)) |
| break; |
| } |
| return c; |
| } |
| |
| /* |
| * Allocate a multicast cache entry |
| */ |
| static struct mfc6_cache *ip6mr_cache_alloc(void) |
| { |
| struct mfc6_cache *c = kmem_cache_alloc(mrt_cachep, GFP_KERNEL); |
| if (c == NULL) |
| return NULL; |
| memset(c, 0, sizeof(*c)); |
| c->mfc_un.res.minvif = MAXMIFS; |
| return c; |
| } |
| |
| static struct mfc6_cache *ip6mr_cache_alloc_unres(void) |
| { |
| struct mfc6_cache *c = kmem_cache_alloc(mrt_cachep, GFP_ATOMIC); |
| if (c == NULL) |
| return NULL; |
| memset(c, 0, sizeof(*c)); |
| skb_queue_head_init(&c->mfc_un.unres.unresolved); |
| c->mfc_un.unres.expires = jiffies + 10 * HZ; |
| return c; |
| } |
| |
| /* |
| * A cache entry has gone into a resolved state from queued |
| */ |
| |
| static void ip6mr_cache_resolve(struct mfc6_cache *uc, struct mfc6_cache *c) |
| { |
| struct sk_buff *skb; |
| |
| /* |
| * Play the pending entries through our router |
| */ |
| |
| while((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) { |
| if (ipv6_hdr(skb)->version == 0) { |
| int err; |
| struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr)); |
| |
| if (ip6mr_fill_mroute(skb, c, NLMSG_DATA(nlh)) > 0) { |
| nlh->nlmsg_len = skb_tail_pointer(skb) - (u8 *)nlh; |
| } else { |
| nlh->nlmsg_type = NLMSG_ERROR; |
| nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); |
| skb_trim(skb, nlh->nlmsg_len); |
| ((struct nlmsgerr *)NLMSG_DATA(nlh))->error = -EMSGSIZE; |
| } |
| err = rtnl_unicast(skb, &init_net, NETLINK_CB(skb).pid); |
| } else |
| ip6_mr_forward(skb, c); |
| } |
| } |
| |
| /* |
| * Bounce a cache query up to pim6sd. We could use netlink for this but pim6sd |
| * expects the following bizarre scheme. |
| * |
| * Called under mrt_lock. |
| */ |
| |
| static int ip6mr_cache_report(struct sk_buff *pkt, mifi_t mifi, int assert) |
| { |
| struct sk_buff *skb; |
| struct mrt6msg *msg; |
| int ret; |
| |
| #ifdef CONFIG_IPV6_PIMSM_V2 |
| if (assert == MRT6MSG_WHOLEPKT) |
| skb = skb_realloc_headroom(pkt, -skb_network_offset(pkt) |
| +sizeof(*msg)); |
| else |
| #endif |
| skb = alloc_skb(sizeof(struct ipv6hdr) + sizeof(*msg), GFP_ATOMIC); |
| |
| if (!skb) |
| return -ENOBUFS; |
| |
| /* I suppose that internal messages |
| * do not require checksums */ |
| |
| skb->ip_summed = CHECKSUM_UNNECESSARY; |
| |
| #ifdef CONFIG_IPV6_PIMSM_V2 |
| if (assert == MRT6MSG_WHOLEPKT) { |
| /* Ugly, but we have no choice with this interface. |
| Duplicate old header, fix length etc. |
| And all this only to mangle msg->im6_msgtype and |
| to set msg->im6_mbz to "mbz" :-) |
| */ |
| skb_push(skb, -skb_network_offset(pkt)); |
| |
| skb_push(skb, sizeof(*msg)); |
| skb_reset_transport_header(skb); |
| msg = (struct mrt6msg *)skb_transport_header(skb); |
| msg->im6_mbz = 0; |
| msg->im6_msgtype = MRT6MSG_WHOLEPKT; |
| msg->im6_mif = reg_vif_num; |
| msg->im6_pad = 0; |
| ipv6_addr_copy(&msg->im6_src, &ipv6_hdr(pkt)->saddr); |
| ipv6_addr_copy(&msg->im6_dst, &ipv6_hdr(pkt)->daddr); |
| |
| skb->ip_summed = CHECKSUM_UNNECESSARY; |
| } else |
| #endif |
| { |
| /* |
| * Copy the IP header |
| */ |
| |
| skb_put(skb, sizeof(struct ipv6hdr)); |
| skb_reset_network_header(skb); |
| skb_copy_to_linear_data(skb, ipv6_hdr(pkt), sizeof(struct ipv6hdr)); |
| |
| /* |
| * Add our header |
| */ |
| skb_put(skb, sizeof(*msg)); |
| skb_reset_transport_header(skb); |
| msg = (struct mrt6msg *)skb_transport_header(skb); |
| |
| msg->im6_mbz = 0; |
| msg->im6_msgtype = assert; |
| msg->im6_mif = mifi; |
| msg->im6_pad = 0; |
| ipv6_addr_copy(&msg->im6_src, &ipv6_hdr(pkt)->saddr); |
| ipv6_addr_copy(&msg->im6_dst, &ipv6_hdr(pkt)->daddr); |
| |
| skb->dst = dst_clone(pkt->dst); |
| skb->ip_summed = CHECKSUM_UNNECESSARY; |
| |
| skb_pull(skb, sizeof(struct ipv6hdr)); |
| } |
| |
| if (mroute6_socket == NULL) { |
| kfree_skb(skb); |
| return -EINVAL; |
| } |
| |
| /* |
| * Deliver to user space multicast routing algorithms |
| */ |
| if ((ret = sock_queue_rcv_skb(mroute6_socket, skb)) < 0) { |
| if (net_ratelimit()) |
| printk(KERN_WARNING "mroute6: pending queue full, dropping entries.\n"); |
| kfree_skb(skb); |
| } |
| |
| return ret; |
| } |
| |
| /* |
| * Queue a packet for resolution. It gets locked cache entry! |
| */ |
| |
| static int |
| ip6mr_cache_unresolved(mifi_t mifi, struct sk_buff *skb) |
| { |
| int err; |
| struct mfc6_cache *c; |
| |
| spin_lock_bh(&mfc_unres_lock); |
| for (c = mfc_unres_queue; c; c = c->next) { |
| if (ipv6_addr_equal(&c->mf6c_mcastgrp, &ipv6_hdr(skb)->daddr) && |
| ipv6_addr_equal(&c->mf6c_origin, &ipv6_hdr(skb)->saddr)) |
| break; |
| } |
| |
| if (c == NULL) { |
| /* |
| * Create a new entry if allowable |
| */ |
| |
| if (atomic_read(&cache_resolve_queue_len) >= 10 || |
| (c = ip6mr_cache_alloc_unres()) == NULL) { |
| spin_unlock_bh(&mfc_unres_lock); |
| |
| kfree_skb(skb); |
| return -ENOBUFS; |
| } |
| |
| /* |
| * Fill in the new cache entry |
| */ |
| c->mf6c_parent = -1; |
| c->mf6c_origin = ipv6_hdr(skb)->saddr; |
| c->mf6c_mcastgrp = ipv6_hdr(skb)->daddr; |
| |
| /* |
| * Reflect first query at pim6sd |
| */ |
| if ((err = ip6mr_cache_report(skb, mifi, MRT6MSG_NOCACHE)) < 0) { |
| /* If the report failed throw the cache entry |
| out - Brad Parker |
| */ |
| spin_unlock_bh(&mfc_unres_lock); |
| |
| kmem_cache_free(mrt_cachep, c); |
| kfree_skb(skb); |
| return err; |
| } |
| |
| atomic_inc(&cache_resolve_queue_len); |
| c->next = mfc_unres_queue; |
| mfc_unres_queue = c; |
| |
| ipmr_do_expire_process(1); |
| } |
| |
| /* |
| * See if we can append the packet |
| */ |
| if (c->mfc_un.unres.unresolved.qlen > 3) { |
| kfree_skb(skb); |
| err = -ENOBUFS; |
| } else { |
| skb_queue_tail(&c->mfc_un.unres.unresolved, skb); |
| err = 0; |
| } |
| |
| spin_unlock_bh(&mfc_unres_lock); |
| return err; |
| } |
| |
| /* |
| * MFC6 cache manipulation by user space |
| */ |
| |
| static int ip6mr_mfc_delete(struct mf6cctl *mfc) |
| { |
| int line; |
| struct mfc6_cache *c, **cp; |
| |
| line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr); |
| |
| for (cp = &mfc6_cache_array[line]; (c = *cp) != NULL; cp = &c->next) { |
| if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) && |
| ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr)) { |
| write_lock_bh(&mrt_lock); |
| *cp = c->next; |
| write_unlock_bh(&mrt_lock); |
| |
| kmem_cache_free(mrt_cachep, c); |
| return 0; |
| } |
| } |
| return -ENOENT; |
| } |
| |
| static int ip6mr_device_event(struct notifier_block *this, |
| unsigned long event, void *ptr) |
| { |
| struct net_device *dev = ptr; |
| struct mif_device *v; |
| int ct; |
| |
| if (dev_net(dev) != &init_net) |
| return NOTIFY_DONE; |
| |
| if (event != NETDEV_UNREGISTER) |
| return NOTIFY_DONE; |
| |
| v = &vif6_table[0]; |
| for (ct = 0; ct < maxvif; ct++, v++) { |
| if (v->dev == dev) |
| mif6_delete(ct); |
| } |
| return NOTIFY_DONE; |
| } |
| |
| static struct notifier_block ip6_mr_notifier = { |
| .notifier_call = ip6mr_device_event |
| }; |
| |
| /* |
| * Setup for IP multicast routing |
| */ |
| |
| void __init ip6_mr_init(void) |
| { |
| mrt_cachep = kmem_cache_create("ip6_mrt_cache", |
| sizeof(struct mfc6_cache), |
| 0, SLAB_HWCACHE_ALIGN, |
| NULL); |
| if (!mrt_cachep) |
| panic("cannot allocate ip6_mrt_cache"); |
| |
| setup_timer(&ipmr_expire_timer, ipmr_expire_process, 0); |
| register_netdevice_notifier(&ip6_mr_notifier); |
| #ifdef CONFIG_PROC_FS |
| proc_net_fops_create(&init_net, "ip6_mr_vif", 0, &ip6mr_vif_fops); |
| proc_net_fops_create(&init_net, "ip6_mr_cache", 0, &ip6mr_mfc_fops); |
| #endif |
| } |
| |
| |
| static int ip6mr_mfc_add(struct mf6cctl *mfc, int mrtsock) |
| { |
| int line; |
| struct mfc6_cache *uc, *c, **cp; |
| unsigned char ttls[MAXMIFS]; |
| int i; |
| |
| memset(ttls, 255, MAXMIFS); |
| for (i = 0; i < MAXMIFS; i++) { |
| if (IF_ISSET(i, &mfc->mf6cc_ifset)) |
| ttls[i] = 1; |
| |
| } |
| |
| line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr); |
| |
| for (cp = &mfc6_cache_array[line]; (c = *cp) != NULL; cp = &c->next) { |
| if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) && |
| ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr)) |
| break; |
| } |
| |
| if (c != NULL) { |
| write_lock_bh(&mrt_lock); |
| c->mf6c_parent = mfc->mf6cc_parent; |
| ip6mr_update_thresholds(c, ttls); |
| if (!mrtsock) |
| c->mfc_flags |= MFC_STATIC; |
| write_unlock_bh(&mrt_lock); |
| return 0; |
| } |
| |
| if (!ipv6_addr_is_multicast(&mfc->mf6cc_mcastgrp.sin6_addr)) |
| return -EINVAL; |
| |
| c = ip6mr_cache_alloc(); |
| if (c == NULL) |
| return -ENOMEM; |
| |
| c->mf6c_origin = mfc->mf6cc_origin.sin6_addr; |
| c->mf6c_mcastgrp = mfc->mf6cc_mcastgrp.sin6_addr; |
| c->mf6c_parent = mfc->mf6cc_parent; |
| ip6mr_update_thresholds(c, ttls); |
| if (!mrtsock) |
| c->mfc_flags |= MFC_STATIC; |
| |
| write_lock_bh(&mrt_lock); |
| c->next = mfc6_cache_array[line]; |
| mfc6_cache_array[line] = c; |
| write_unlock_bh(&mrt_lock); |
| |
| /* |
| * Check to see if we resolved a queued list. If so we |
| * need to send on the frames and tidy up. |
| */ |
| spin_lock_bh(&mfc_unres_lock); |
| for (cp = &mfc_unres_queue; (uc = *cp) != NULL; |
| cp = &uc->next) { |
| if (ipv6_addr_equal(&uc->mf6c_origin, &c->mf6c_origin) && |
| ipv6_addr_equal(&uc->mf6c_mcastgrp, &c->mf6c_mcastgrp)) { |
| *cp = uc->next; |
| if (atomic_dec_and_test(&cache_resolve_queue_len)) |
| del_timer(&ipmr_expire_timer); |
| break; |
| } |
| } |
| spin_unlock_bh(&mfc_unres_lock); |
| |
| if (uc) { |
| ip6mr_cache_resolve(uc, c); |
| kmem_cache_free(mrt_cachep, uc); |
| } |
| return 0; |
| } |
| |
| /* |
| * Close the multicast socket, and clear the vif tables etc |
| */ |
| |
| static void mroute_clean_tables(struct sock *sk) |
| { |
| int i; |
| |
| /* |
| * Shut down all active vif entries |
| */ |
| for (i = 0; i < maxvif; i++) { |
| if (!(vif6_table[i].flags & VIFF_STATIC)) |
| mif6_delete(i); |
| } |
| |
| /* |
| * Wipe the cache |
| */ |
| for (i = 0; i < ARRAY_SIZE(mfc6_cache_array); i++) { |
| struct mfc6_cache *c, **cp; |
| |
| cp = &mfc6_cache_array[i]; |
| while ((c = *cp) != NULL) { |
| if (c->mfc_flags & MFC_STATIC) { |
| cp = &c->next; |
| continue; |
| } |
| write_lock_bh(&mrt_lock); |
| *cp = c->next; |
| write_unlock_bh(&mrt_lock); |
| |
| kmem_cache_free(mrt_cachep, c); |
| } |
| } |
| |
| if (atomic_read(&cache_resolve_queue_len) != 0) { |
| struct mfc6_cache *c; |
| |
| spin_lock_bh(&mfc_unres_lock); |
| while (mfc_unres_queue != NULL) { |
| c = mfc_unres_queue; |
| mfc_unres_queue = c->next; |
| spin_unlock_bh(&mfc_unres_lock); |
| |
| ip6mr_destroy_unres(c); |
| |
| spin_lock_bh(&mfc_unres_lock); |
| } |
| spin_unlock_bh(&mfc_unres_lock); |
| } |
| } |
| |
| static int ip6mr_sk_init(struct sock *sk) |
| { |
| int err = 0; |
| |
| rtnl_lock(); |
| write_lock_bh(&mrt_lock); |
| if (likely(mroute6_socket == NULL)) |
| mroute6_socket = sk; |
| else |
| err = -EADDRINUSE; |
| write_unlock_bh(&mrt_lock); |
| |
| rtnl_unlock(); |
| |
| return err; |
| } |
| |
| int ip6mr_sk_done(struct sock *sk) |
| { |
| int err = 0; |
| |
| rtnl_lock(); |
| if (sk == mroute6_socket) { |
| write_lock_bh(&mrt_lock); |
| mroute6_socket = NULL; |
| write_unlock_bh(&mrt_lock); |
| |
| mroute_clean_tables(sk); |
| } else |
| err = -EACCES; |
| rtnl_unlock(); |
| |
| return err; |
| } |
| |
| /* |
| * Socket options and virtual interface manipulation. The whole |
| * virtual interface system is a complete heap, but unfortunately |
| * that's how BSD mrouted happens to think. Maybe one day with a proper |
| * MOSPF/PIM router set up we can clean this up. |
| */ |
| |
| int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, int optlen) |
| { |
| int ret; |
| struct mif6ctl vif; |
| struct mf6cctl mfc; |
| mifi_t mifi; |
| |
| if (optname != MRT6_INIT) { |
| if (sk != mroute6_socket && !capable(CAP_NET_ADMIN)) |
| return -EACCES; |
| } |
| |
| switch (optname) { |
| case MRT6_INIT: |
| if (sk->sk_type != SOCK_RAW || |
| inet_sk(sk)->num != IPPROTO_ICMPV6) |
| return -EOPNOTSUPP; |
| if (optlen < sizeof(int)) |
| return -EINVAL; |
| |
| return ip6mr_sk_init(sk); |
| |
| case MRT6_DONE: |
| return ip6mr_sk_done(sk); |
| |
| case MRT6_ADD_MIF: |
| if (optlen < sizeof(vif)) |
| return -EINVAL; |
| if (copy_from_user(&vif, optval, sizeof(vif))) |
| return -EFAULT; |
| if (vif.mif6c_mifi >= MAXMIFS) |
| return -ENFILE; |
| rtnl_lock(); |
| ret = mif6_add(&vif, sk == mroute6_socket); |
| rtnl_unlock(); |
| return ret; |
| |
| case MRT6_DEL_MIF: |
| if (optlen < sizeof(mifi_t)) |
| return -EINVAL; |
| if (copy_from_user(&mifi, optval, sizeof(mifi_t))) |
| return -EFAULT; |
| rtnl_lock(); |
| ret = mif6_delete(mifi); |
| rtnl_unlock(); |
| return ret; |
| |
| /* |
| * Manipulate the forwarding caches. These live |
| * in a sort of kernel/user symbiosis. |
| */ |
| case MRT6_ADD_MFC: |
| case MRT6_DEL_MFC: |
| if (optlen < sizeof(mfc)) |
| return -EINVAL; |
| if (copy_from_user(&mfc, optval, sizeof(mfc))) |
| return -EFAULT; |
| rtnl_lock(); |
| if (optname == MRT6_DEL_MFC) |
| ret = ip6mr_mfc_delete(&mfc); |
| else |
| ret = ip6mr_mfc_add(&mfc, sk == mroute6_socket); |
| rtnl_unlock(); |
| return ret; |
| |
| /* |
| * Control PIM assert (to activate pim will activate assert) |
| */ |
| case MRT6_ASSERT: |
| { |
| int v; |
| if (get_user(v, (int __user *)optval)) |
| return -EFAULT; |
| mroute_do_assert = !!v; |
| return 0; |
| } |
| |
| #ifdef CONFIG_IPV6_PIMSM_V2 |
| case MRT6_PIM: |
| { |
| int v; |
| if (get_user(v, (int __user *)optval)) |
| return -EFAULT; |
| v = !!v; |
| rtnl_lock(); |
| ret = 0; |
| if (v != mroute_do_pim) { |
| mroute_do_pim = v; |
| mroute_do_assert = v; |
| if (mroute_do_pim) |
| ret = inet6_add_protocol(&pim6_protocol, |
| IPPROTO_PIM); |
| else |
| ret = inet6_del_protocol(&pim6_protocol, |
| IPPROTO_PIM); |
| if (ret < 0) |
| ret = -EAGAIN; |
| } |
| rtnl_unlock(); |
| return ret; |
| } |
| |
| #endif |
| /* |
| * Spurious command, or MRT6_VERSION which you cannot |
| * set. |
| */ |
| default: |
| return -ENOPROTOOPT; |
| } |
| } |
| |
| /* |
| * Getsock opt support for the multicast routing system. |
| */ |
| |
| int ip6_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, |
| int __user *optlen) |
| { |
| int olr; |
| int val; |
| |
| switch (optname) { |
| case MRT6_VERSION: |
| val = 0x0305; |
| break; |
| #ifdef CONFIG_IPV6_PIMSM_V2 |
| case MRT6_PIM: |
| val = mroute_do_pim; |
| break; |
| #endif |
| case MRT6_ASSERT: |
| val = mroute_do_assert; |
| break; |
| default: |
| return -ENOPROTOOPT; |
| } |
| |
| if (get_user(olr, optlen)) |
| return -EFAULT; |
| |
| olr = min_t(int, olr, sizeof(int)); |
| if (olr < 0) |
| return -EINVAL; |
| |
| if (put_user(olr, optlen)) |
| return -EFAULT; |
| if (copy_to_user(optval, &val, olr)) |
| return -EFAULT; |
| return 0; |
| } |
| |
| /* |
| * The IP multicast ioctl support routines. |
| */ |
| |
| int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg) |
| { |
| struct sioc_sg_req6 sr; |
| struct sioc_mif_req6 vr; |
| struct mif_device *vif; |
| struct mfc6_cache *c; |
| |
| switch (cmd) { |
| case SIOCGETMIFCNT_IN6: |
| if (copy_from_user(&vr, arg, sizeof(vr))) |
| return -EFAULT; |
| if (vr.mifi >= maxvif) |
| return -EINVAL; |
| read_lock(&mrt_lock); |
| vif = &vif6_table[vr.mifi]; |
| if (MIF_EXISTS(vr.mifi)) { |
| vr.icount = vif->pkt_in; |
| vr.ocount = vif->pkt_out; |
| vr.ibytes = vif->bytes_in; |
| vr.obytes = vif->bytes_out; |
| read_unlock(&mrt_lock); |
| |
| if (copy_to_user(arg, &vr, sizeof(vr))) |
| return -EFAULT; |
| return 0; |
| } |
| read_unlock(&mrt_lock); |
| return -EADDRNOTAVAIL; |
| case SIOCGETSGCNT_IN6: |
| if (copy_from_user(&sr, arg, sizeof(sr))) |
| return -EFAULT; |
| |
| read_lock(&mrt_lock); |
| c = ip6mr_cache_find(&sr.src.sin6_addr, &sr.grp.sin6_addr); |
| if (c) { |
| sr.pktcnt = c->mfc_un.res.pkt; |
| sr.bytecnt = c->mfc_un.res.bytes; |
| sr.wrong_if = c->mfc_un.res.wrong_if; |
| read_unlock(&mrt_lock); |
| |
| if (copy_to_user(arg, &sr, sizeof(sr))) |
| return -EFAULT; |
| return 0; |
| } |
| read_unlock(&mrt_lock); |
| return -EADDRNOTAVAIL; |
| default: |
| return -ENOIOCTLCMD; |
| } |
| } |
| |
| |
| static inline int ip6mr_forward2_finish(struct sk_buff *skb) |
| { |
| IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), IPSTATS_MIB_OUTFORWDATAGRAMS); |
| return dst_output(skb); |
| } |
| |
| /* |
| * Processing handlers for ip6mr_forward |
| */ |
| |
| static int ip6mr_forward2(struct sk_buff *skb, struct mfc6_cache *c, int vifi) |
| { |
| struct ipv6hdr *ipv6h; |
| struct mif_device *vif = &vif6_table[vifi]; |
| struct net_device *dev; |
| struct dst_entry *dst; |
| struct flowi fl; |
| |
| if (vif->dev == NULL) |
| goto out_free; |
| |
| #ifdef CONFIG_IPV6_PIMSM_V2 |
| if (vif->flags & MIFF_REGISTER) { |
| vif->pkt_out++; |
| vif->bytes_out += skb->len; |
| vif->dev->stats.tx_bytes += skb->len; |
| vif->dev->stats.tx_packets++; |
| ip6mr_cache_report(skb, vifi, MRT6MSG_WHOLEPKT); |
| kfree_skb(skb); |
| return 0; |
| } |
| #endif |
| |
| ipv6h = ipv6_hdr(skb); |
| |
| fl = (struct flowi) { |
| .oif = vif->link, |
| .nl_u = { .ip6_u = |
| { .daddr = ipv6h->daddr, } |
| } |
| }; |
| |
| dst = ip6_route_output(&init_net, NULL, &fl); |
| if (!dst) |
| goto out_free; |
| |
| dst_release(skb->dst); |
| skb->dst = dst; |
| |
| /* |
| * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally |
| * not only before forwarding, but after forwarding on all output |
| * interfaces. It is clear, if mrouter runs a multicasting |
| * program, it should receive packets not depending to what interface |
| * program is joined. |
| * If we will not make it, the program will have to join on all |
| * interfaces. On the other hand, multihoming host (or router, but |
| * not mrouter) cannot join to more than one interface - it will |
| * result in receiving multiple packets. |
| */ |
| dev = vif->dev; |
| skb->dev = dev; |
| vif->pkt_out++; |
| vif->bytes_out += skb->len; |
| |
| /* We are about to write */ |
| /* XXX: extension headers? */ |
| if (skb_cow(skb, sizeof(*ipv6h) + LL_RESERVED_SPACE(dev))) |
| goto out_free; |
| |
| ipv6h = ipv6_hdr(skb); |
| ipv6h->hop_limit--; |
| |
| IP6CB(skb)->flags |= IP6SKB_FORWARDED; |
| |
| return NF_HOOK(PF_INET6, NF_INET_FORWARD, skb, skb->dev, dev, |
| ip6mr_forward2_finish); |
| |
| out_free: |
| kfree_skb(skb); |
| return 0; |
| } |
| |
| static int ip6mr_find_vif(struct net_device *dev) |
| { |
| int ct; |
| for (ct = maxvif - 1; ct >= 0; ct--) { |
| if (vif6_table[ct].dev == dev) |
| break; |
| } |
| return ct; |
| } |
| |
| static int ip6_mr_forward(struct sk_buff *skb, struct mfc6_cache *cache) |
| { |
| int psend = -1; |
| int vif, ct; |
| |
| vif = cache->mf6c_parent; |
| cache->mfc_un.res.pkt++; |
| cache->mfc_un.res.bytes += skb->len; |
| |
| /* |
| * Wrong interface: drop packet and (maybe) send PIM assert. |
| */ |
| if (vif6_table[vif].dev != skb->dev) { |
| int true_vifi; |
| |
| cache->mfc_un.res.wrong_if++; |
| true_vifi = ip6mr_find_vif(skb->dev); |
| |
| if (true_vifi >= 0 && mroute_do_assert && |
| /* pimsm uses asserts, when switching from RPT to SPT, |
| so that we cannot check that packet arrived on an oif. |
| It is bad, but otherwise we would need to move pretty |
| large chunk of pimd to kernel. Ough... --ANK |
| */ |
| (mroute_do_pim || cache->mfc_un.res.ttls[true_vifi] < 255) && |
| time_after(jiffies, |
| cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) { |
| cache->mfc_un.res.last_assert = jiffies; |
| ip6mr_cache_report(skb, true_vifi, MRT6MSG_WRONGMIF); |
| } |
| goto dont_forward; |
| } |
| |
| vif6_table[vif].pkt_in++; |
| vif6_table[vif].bytes_in += skb->len; |
| |
| /* |
| * Forward the frame |
| */ |
| for (ct = cache->mfc_un.res.maxvif - 1; ct >= cache->mfc_un.res.minvif; ct--) { |
| if (ipv6_hdr(skb)->hop_limit > cache->mfc_un.res.ttls[ct]) { |
| if (psend != -1) { |
| struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); |
| if (skb2) |
| ip6mr_forward2(skb2, cache, psend); |
| } |
| psend = ct; |
| } |
| } |
| if (psend != -1) { |
| ip6mr_forward2(skb, cache, psend); |
| return 0; |
| } |
| |
| dont_forward: |
| kfree_skb(skb); |
| return 0; |
| } |
| |
| |
| /* |
| * Multicast packets for forwarding arrive here |
| */ |
| |
| int ip6_mr_input(struct sk_buff *skb) |
| { |
| struct mfc6_cache *cache; |
| |
| read_lock(&mrt_lock); |
| cache = ip6mr_cache_find(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr); |
| |
| /* |
| * No usable cache entry |
| */ |
| if (cache == NULL) { |
| int vif; |
| |
| vif = ip6mr_find_vif(skb->dev); |
| if (vif >= 0) { |
| int err = ip6mr_cache_unresolved(vif, skb); |
| read_unlock(&mrt_lock); |
| |
| return err; |
| } |
| read_unlock(&mrt_lock); |
| kfree_skb(skb); |
| return -ENODEV; |
| } |
| |
| ip6_mr_forward(skb, cache); |
| |
| read_unlock(&mrt_lock); |
| |
| return 0; |
| } |
| |
| |
| static int |
| ip6mr_fill_mroute(struct sk_buff *skb, struct mfc6_cache *c, struct rtmsg *rtm) |
| { |
| int ct; |
| struct rtnexthop *nhp; |
| struct net_device *dev = vif6_table[c->mf6c_parent].dev; |
| u8 *b = skb_tail_pointer(skb); |
| struct rtattr *mp_head; |
| |
| if (dev) |
| RTA_PUT(skb, RTA_IIF, 4, &dev->ifindex); |
| |
| mp_head = (struct rtattr *)skb_put(skb, RTA_LENGTH(0)); |
| |
| for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { |
| if (c->mfc_un.res.ttls[ct] < 255) { |
| if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4)) |
| goto rtattr_failure; |
| nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp))); |
| nhp->rtnh_flags = 0; |
| nhp->rtnh_hops = c->mfc_un.res.ttls[ct]; |
| nhp->rtnh_ifindex = vif6_table[ct].dev->ifindex; |
| nhp->rtnh_len = sizeof(*nhp); |
| } |
| } |
| mp_head->rta_type = RTA_MULTIPATH; |
| mp_head->rta_len = skb_tail_pointer(skb) - (u8 *)mp_head; |
| rtm->rtm_type = RTN_MULTICAST; |
| return 1; |
| |
| rtattr_failure: |
| nlmsg_trim(skb, b); |
| return -EMSGSIZE; |
| } |
| |
| int ip6mr_get_route(struct sk_buff *skb, struct rtmsg *rtm, int nowait) |
| { |
| int err; |
| struct mfc6_cache *cache; |
| struct rt6_info *rt = (struct rt6_info *)skb->dst; |
| |
| read_lock(&mrt_lock); |
| cache = ip6mr_cache_find(&rt->rt6i_src.addr, &rt->rt6i_dst.addr); |
| |
| if (!cache) { |
| struct sk_buff *skb2; |
| struct ipv6hdr *iph; |
| struct net_device *dev; |
| int vif; |
| |
| if (nowait) { |
| read_unlock(&mrt_lock); |
| return -EAGAIN; |
| } |
| |
| dev = skb->dev; |
| if (dev == NULL || (vif = ip6mr_find_vif(dev)) < 0) { |
| read_unlock(&mrt_lock); |
| return -ENODEV; |
| } |
| |
| /* really correct? */ |
| skb2 = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); |
| if (!skb2) { |
| read_unlock(&mrt_lock); |
| return -ENOMEM; |
| } |
| |
| skb_reset_transport_header(skb2); |
| |
| skb_put(skb2, sizeof(struct ipv6hdr)); |
| skb_reset_network_header(skb2); |
| |
| iph = ipv6_hdr(skb2); |
| iph->version = 0; |
| iph->priority = 0; |
| iph->flow_lbl[0] = 0; |
| iph->flow_lbl[1] = 0; |
| iph->flow_lbl[2] = 0; |
| iph->payload_len = 0; |
| iph->nexthdr = IPPROTO_NONE; |
| iph->hop_limit = 0; |
| ipv6_addr_copy(&iph->saddr, &rt->rt6i_src.addr); |
| ipv6_addr_copy(&iph->daddr, &rt->rt6i_dst.addr); |
| |
| err = ip6mr_cache_unresolved(vif, skb2); |
| read_unlock(&mrt_lock); |
| |
| return err; |
| } |
| |
| if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY)) |
| cache->mfc_flags |= MFC_NOTIFY; |
| |
| err = ip6mr_fill_mroute(skb, cache, rtm); |
| read_unlock(&mrt_lock); |
| return err; |
| } |
| |