| /* |
| * IP multicast routing support for mrouted 3.6/3.8 |
| * |
| * (c) 1995 Alan Cox, <alan@lxorguk.ukuu.org.uk> |
| * Linux Consultancy and Custom Driver Development |
| * |
| * 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. |
| * |
| * Fixes: |
| * Michael Chastain : Incorrect size of copying. |
| * Alan Cox : Added the cache manager code |
| * Alan Cox : Fixed the clone/copy bug and device race. |
| * Mike McLagan : Routing by source |
| * Malcolm Beattie : Buffer handling fixes. |
| * Alexey Kuznetsov : Double buffer free and other fixes. |
| * SVR Anand : Fixed several multicast bugs and problems. |
| * Alexey Kuznetsov : Status, optimisations and more. |
| * Brad Parker : Better behaviour on mrouted upcall |
| * overflow. |
| * Carlos Picoto : PIMv1 Support |
| * Pavlin Ivanov Radoslavov: PIMv2 Registers must checksum only PIM header |
| * Relax this requirement to work with older peers. |
| * |
| */ |
| |
| #include <asm/system.h> |
| #include <asm/uaccess.h> |
| #include <linux/types.h> |
| #include <linux/capability.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/in.h> |
| #include <linux/inet.h> |
| #include <linux/netdevice.h> |
| #include <linux/inetdevice.h> |
| #include <linux/igmp.h> |
| #include <linux/proc_fs.h> |
| #include <linux/seq_file.h> |
| #include <linux/mroute.h> |
| #include <linux/init.h> |
| #include <linux/if_ether.h> |
| #include <net/net_namespace.h> |
| #include <net/ip.h> |
| #include <net/protocol.h> |
| #include <linux/skbuff.h> |
| #include <net/route.h> |
| #include <net/sock.h> |
| #include <net/icmp.h> |
| #include <net/udp.h> |
| #include <net/raw.h> |
| #include <linux/notifier.h> |
| #include <linux/if_arp.h> |
| #include <linux/netfilter_ipv4.h> |
| #include <net/ipip.h> |
| #include <net/checksum.h> |
| #include <net/netlink.h> |
| |
| #if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2) |
| #define CONFIG_IP_PIMSM 1 |
| #endif |
| |
| /* 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 |
| */ |
| |
| #define VIF_EXISTS(_net, _idx) ((_net)->ipv4.vif_table[_idx].dev != NULL) |
| |
| static struct mfc_cache *mfc_unres_queue; /* Queue of unresolved entries */ |
| |
| /* 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 ip_mr_forward(struct sk_buff *skb, struct mfc_cache *cache, int local); |
| static int ipmr_cache_report(struct net *net, |
| struct sk_buff *pkt, vifi_t vifi, int assert); |
| static int ipmr_fill_mroute(struct sk_buff *skb, struct mfc_cache *c, struct rtmsg *rtm); |
| |
| static struct timer_list ipmr_expire_timer; |
| |
| /* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */ |
| |
| static void ipmr_del_tunnel(struct net_device *dev, struct vifctl *v) |
| { |
| struct net *net = dev_net(dev); |
| |
| dev_close(dev); |
| |
| dev = __dev_get_by_name(net, "tunl0"); |
| if (dev) { |
| const struct net_device_ops *ops = dev->netdev_ops; |
| struct ifreq ifr; |
| struct ip_tunnel_parm p; |
| |
| memset(&p, 0, sizeof(p)); |
| p.iph.daddr = v->vifc_rmt_addr.s_addr; |
| p.iph.saddr = v->vifc_lcl_addr.s_addr; |
| p.iph.version = 4; |
| p.iph.ihl = 5; |
| p.iph.protocol = IPPROTO_IPIP; |
| sprintf(p.name, "dvmrp%d", v->vifc_vifi); |
| ifr.ifr_ifru.ifru_data = (__force void __user *)&p; |
| |
| if (ops->ndo_do_ioctl) { |
| mm_segment_t oldfs = get_fs(); |
| |
| set_fs(KERNEL_DS); |
| ops->ndo_do_ioctl(dev, &ifr, SIOCDELTUNNEL); |
| set_fs(oldfs); |
| } |
| } |
| } |
| |
| static |
| struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v) |
| { |
| struct net_device *dev; |
| |
| dev = __dev_get_by_name(net, "tunl0"); |
| |
| if (dev) { |
| const struct net_device_ops *ops = dev->netdev_ops; |
| int err; |
| struct ifreq ifr; |
| struct ip_tunnel_parm p; |
| struct in_device *in_dev; |
| |
| memset(&p, 0, sizeof(p)); |
| p.iph.daddr = v->vifc_rmt_addr.s_addr; |
| p.iph.saddr = v->vifc_lcl_addr.s_addr; |
| p.iph.version = 4; |
| p.iph.ihl = 5; |
| p.iph.protocol = IPPROTO_IPIP; |
| sprintf(p.name, "dvmrp%d", v->vifc_vifi); |
| ifr.ifr_ifru.ifru_data = (__force void __user *)&p; |
| |
| if (ops->ndo_do_ioctl) { |
| mm_segment_t oldfs = get_fs(); |
| |
| set_fs(KERNEL_DS); |
| err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); |
| set_fs(oldfs); |
| } else |
| err = -EOPNOTSUPP; |
| |
| dev = NULL; |
| |
| if (err == 0 && |
| (dev = __dev_get_by_name(net, p.name)) != NULL) { |
| dev->flags |= IFF_MULTICAST; |
| |
| in_dev = __in_dev_get_rtnl(dev); |
| if (in_dev == NULL) |
| goto failure; |
| |
| ipv4_devconf_setall(in_dev); |
| IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0; |
| |
| if (dev_open(dev)) |
| goto failure; |
| dev_hold(dev); |
| } |
| } |
| return dev; |
| |
| failure: |
| /* allow the register to be completed before unregistering. */ |
| rtnl_unlock(); |
| rtnl_lock(); |
| |
| unregister_netdevice(dev); |
| return NULL; |
| } |
| |
| #ifdef CONFIG_IP_PIMSM |
| |
| static netdev_tx_t reg_vif_xmit(struct sk_buff *skb, struct net_device *dev) |
| { |
| struct net *net = dev_net(dev); |
| |
| read_lock(&mrt_lock); |
| dev->stats.tx_bytes += skb->len; |
| dev->stats.tx_packets++; |
| ipmr_cache_report(net, skb, net->ipv4.mroute_reg_vif_num, |
| IGMPMSG_WHOLEPKT); |
| read_unlock(&mrt_lock); |
| kfree_skb(skb); |
| return NETDEV_TX_OK; |
| } |
| |
| static const struct net_device_ops reg_vif_netdev_ops = { |
| .ndo_start_xmit = reg_vif_xmit, |
| }; |
| |
| static void reg_vif_setup(struct net_device *dev) |
| { |
| dev->type = ARPHRD_PIMREG; |
| dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 8; |
| dev->flags = IFF_NOARP; |
| dev->netdev_ops = ®_vif_netdev_ops, |
| dev->destructor = free_netdev; |
| dev->features |= NETIF_F_NETNS_LOCAL; |
| } |
| |
| static struct net_device *ipmr_reg_vif(struct net *net) |
| { |
| struct net_device *dev; |
| struct in_device *in_dev; |
| |
| dev = alloc_netdev(0, "pimreg", reg_vif_setup); |
| |
| if (dev == NULL) |
| return NULL; |
| |
| dev_net_set(dev, net); |
| |
| if (register_netdevice(dev)) { |
| free_netdev(dev); |
| return NULL; |
| } |
| dev->iflink = 0; |
| |
| rcu_read_lock(); |
| if ((in_dev = __in_dev_get_rcu(dev)) == NULL) { |
| rcu_read_unlock(); |
| goto failure; |
| } |
| |
| ipv4_devconf_setall(in_dev); |
| IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0; |
| rcu_read_unlock(); |
| |
| if (dev_open(dev)) |
| goto failure; |
| |
| dev_hold(dev); |
| |
| 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 |
| * @notify: Set to 1, if the caller is a notifier_call |
| */ |
| |
| static int vif_delete(struct net *net, int vifi, int notify, |
| struct list_head *head) |
| { |
| struct vif_device *v; |
| struct net_device *dev; |
| struct in_device *in_dev; |
| |
| if (vifi < 0 || vifi >= net->ipv4.maxvif) |
| return -EADDRNOTAVAIL; |
| |
| v = &net->ipv4.vif_table[vifi]; |
| |
| write_lock_bh(&mrt_lock); |
| dev = v->dev; |
| v->dev = NULL; |
| |
| if (!dev) { |
| write_unlock_bh(&mrt_lock); |
| return -EADDRNOTAVAIL; |
| } |
| |
| #ifdef CONFIG_IP_PIMSM |
| if (vifi == net->ipv4.mroute_reg_vif_num) |
| net->ipv4.mroute_reg_vif_num = -1; |
| #endif |
| |
| if (vifi+1 == net->ipv4.maxvif) { |
| int tmp; |
| for (tmp=vifi-1; tmp>=0; tmp--) { |
| if (VIF_EXISTS(net, tmp)) |
| break; |
| } |
| net->ipv4.maxvif = tmp+1; |
| } |
| |
| write_unlock_bh(&mrt_lock); |
| |
| dev_set_allmulti(dev, -1); |
| |
| if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) { |
| IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)--; |
| ip_rt_multicast_event(in_dev); |
| } |
| |
| if (v->flags&(VIFF_TUNNEL|VIFF_REGISTER) && !notify) |
| unregister_netdevice_queue(dev, head); |
| |
| dev_put(dev); |
| return 0; |
| } |
| |
| static inline void ipmr_cache_free(struct mfc_cache *c) |
| { |
| release_net(mfc_net(c)); |
| kmem_cache_free(mrt_cachep, c); |
| } |
| |
| /* Destroy an unresolved cache entry, killing queued skbs |
| and reporting error to netlink readers. |
| */ |
| |
| static void ipmr_destroy_unres(struct mfc_cache *c) |
| { |
| struct sk_buff *skb; |
| struct nlmsgerr *e; |
| struct net *net = mfc_net(c); |
| |
| atomic_dec(&net->ipv4.cache_resolve_queue_len); |
| |
| while ((skb = skb_dequeue(&c->mfc_un.unres.unresolved))) { |
| if (ip_hdr(skb)->version == 0) { |
| struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); |
| nlh->nlmsg_type = NLMSG_ERROR; |
| nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); |
| skb_trim(skb, nlh->nlmsg_len); |
| e = NLMSG_DATA(nlh); |
| e->error = -ETIMEDOUT; |
| memset(&e->msg, 0, sizeof(e->msg)); |
| |
| rtnl_unicast(skb, net, NETLINK_CB(skb).pid); |
| } else |
| kfree_skb(skb); |
| } |
| |
| ipmr_cache_free(c); |
| } |
| |
| |
| /* Single timer process for all the unresolved queue. */ |
| |
| static void ipmr_expire_process(unsigned long dummy) |
| { |
| unsigned long now; |
| unsigned long expires; |
| struct mfc_cache *c, **cp; |
| |
| if (!spin_trylock(&mfc_unres_lock)) { |
| mod_timer(&ipmr_expire_timer, jiffies+HZ/10); |
| return; |
| } |
| |
| if (mfc_unres_queue == NULL) |
| goto out; |
| |
| now = jiffies; |
| expires = 10*HZ; |
| cp = &mfc_unres_queue; |
| |
| while ((c=*cp) != NULL) { |
| if (time_after(c->mfc_un.unres.expires, now)) { |
| unsigned long interval = c->mfc_un.unres.expires - now; |
| if (interval < expires) |
| expires = interval; |
| cp = &c->next; |
| continue; |
| } |
| |
| *cp = c->next; |
| |
| ipmr_destroy_unres(c); |
| } |
| |
| if (mfc_unres_queue != NULL) |
| mod_timer(&ipmr_expire_timer, jiffies + expires); |
| |
| out: |
| spin_unlock(&mfc_unres_lock); |
| } |
| |
| /* Fill oifs list. It is called under write locked mrt_lock. */ |
| |
| static void ipmr_update_thresholds(struct mfc_cache *cache, unsigned char *ttls) |
| { |
| int vifi; |
| struct net *net = mfc_net(cache); |
| |
| cache->mfc_un.res.minvif = MAXVIFS; |
| cache->mfc_un.res.maxvif = 0; |
| memset(cache->mfc_un.res.ttls, 255, MAXVIFS); |
| |
| for (vifi = 0; vifi < net->ipv4.maxvif; vifi++) { |
| if (VIF_EXISTS(net, 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 vif_add(struct net *net, struct vifctl *vifc, int mrtsock) |
| { |
| int vifi = vifc->vifc_vifi; |
| struct vif_device *v = &net->ipv4.vif_table[vifi]; |
| struct net_device *dev; |
| struct in_device *in_dev; |
| int err; |
| |
| /* Is vif busy ? */ |
| if (VIF_EXISTS(net, vifi)) |
| return -EADDRINUSE; |
| |
| switch (vifc->vifc_flags) { |
| #ifdef CONFIG_IP_PIMSM |
| case VIFF_REGISTER: |
| /* |
| * Special Purpose VIF in PIM |
| * All the packets will be sent to the daemon |
| */ |
| if (net->ipv4.mroute_reg_vif_num >= 0) |
| return -EADDRINUSE; |
| dev = ipmr_reg_vif(net); |
| if (!dev) |
| return -ENOBUFS; |
| err = dev_set_allmulti(dev, 1); |
| if (err) { |
| unregister_netdevice(dev); |
| dev_put(dev); |
| return err; |
| } |
| break; |
| #endif |
| case VIFF_TUNNEL: |
| dev = ipmr_new_tunnel(net, vifc); |
| if (!dev) |
| return -ENOBUFS; |
| err = dev_set_allmulti(dev, 1); |
| if (err) { |
| ipmr_del_tunnel(dev, vifc); |
| dev_put(dev); |
| return err; |
| } |
| break; |
| |
| case VIFF_USE_IFINDEX: |
| case 0: |
| if (vifc->vifc_flags == VIFF_USE_IFINDEX) { |
| dev = dev_get_by_index(net, vifc->vifc_lcl_ifindex); |
| if (dev && dev->ip_ptr == NULL) { |
| dev_put(dev); |
| return -EADDRNOTAVAIL; |
| } |
| } else |
| dev = ip_dev_find(net, vifc->vifc_lcl_addr.s_addr); |
| |
| if (!dev) |
| return -EADDRNOTAVAIL; |
| err = dev_set_allmulti(dev, 1); |
| if (err) { |
| dev_put(dev); |
| return err; |
| } |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| if ((in_dev = __in_dev_get_rtnl(dev)) == NULL) { |
| dev_put(dev); |
| return -EADDRNOTAVAIL; |
| } |
| IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++; |
| ip_rt_multicast_event(in_dev); |
| |
| /* |
| * Fill in the VIF structures |
| */ |
| v->rate_limit = vifc->vifc_rate_limit; |
| v->local = vifc->vifc_lcl_addr.s_addr; |
| v->remote = vifc->vifc_rmt_addr.s_addr; |
| v->flags = vifc->vifc_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&(VIFF_TUNNEL|VIFF_REGISTER)) |
| v->link = dev->iflink; |
| |
| /* And finish update writing critical data */ |
| write_lock_bh(&mrt_lock); |
| v->dev = dev; |
| #ifdef CONFIG_IP_PIMSM |
| if (v->flags&VIFF_REGISTER) |
| net->ipv4.mroute_reg_vif_num = vifi; |
| #endif |
| if (vifi+1 > net->ipv4.maxvif) |
| net->ipv4.maxvif = vifi+1; |
| write_unlock_bh(&mrt_lock); |
| return 0; |
| } |
| |
| static struct mfc_cache *ipmr_cache_find(struct net *net, |
| __be32 origin, |
| __be32 mcastgrp) |
| { |
| int line = MFC_HASH(mcastgrp, origin); |
| struct mfc_cache *c; |
| |
| for (c = net->ipv4.mfc_cache_array[line]; c; c = c->next) { |
| if (c->mfc_origin==origin && c->mfc_mcastgrp==mcastgrp) |
| break; |
| } |
| return c; |
| } |
| |
| /* |
| * Allocate a multicast cache entry |
| */ |
| static struct mfc_cache *ipmr_cache_alloc(struct net *net) |
| { |
| struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL); |
| if (c == NULL) |
| return NULL; |
| c->mfc_un.res.minvif = MAXVIFS; |
| mfc_net_set(c, net); |
| return c; |
| } |
| |
| static struct mfc_cache *ipmr_cache_alloc_unres(struct net *net) |
| { |
| struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC); |
| if (c == NULL) |
| return NULL; |
| skb_queue_head_init(&c->mfc_un.unres.unresolved); |
| c->mfc_un.unres.expires = jiffies + 10*HZ; |
| mfc_net_set(c, net); |
| return c; |
| } |
| |
| /* |
| * A cache entry has gone into a resolved state from queued |
| */ |
| |
| static void ipmr_cache_resolve(struct mfc_cache *uc, struct mfc_cache *c) |
| { |
| struct sk_buff *skb; |
| struct nlmsgerr *e; |
| |
| /* |
| * Play the pending entries through our router |
| */ |
| |
| while ((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) { |
| if (ip_hdr(skb)->version == 0) { |
| struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); |
| |
| if (ipmr_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); |
| e = NLMSG_DATA(nlh); |
| e->error = -EMSGSIZE; |
| memset(&e->msg, 0, sizeof(e->msg)); |
| } |
| |
| rtnl_unicast(skb, mfc_net(c), NETLINK_CB(skb).pid); |
| } else |
| ip_mr_forward(skb, c, 0); |
| } |
| } |
| |
| /* |
| * Bounce a cache query up to mrouted. We could use netlink for this but mrouted |
| * expects the following bizarre scheme. |
| * |
| * Called under mrt_lock. |
| */ |
| |
| static int ipmr_cache_report(struct net *net, |
| struct sk_buff *pkt, vifi_t vifi, int assert) |
| { |
| struct sk_buff *skb; |
| const int ihl = ip_hdrlen(pkt); |
| struct igmphdr *igmp; |
| struct igmpmsg *msg; |
| int ret; |
| |
| #ifdef CONFIG_IP_PIMSM |
| if (assert == IGMPMSG_WHOLEPKT) |
| skb = skb_realloc_headroom(pkt, sizeof(struct iphdr)); |
| else |
| #endif |
| skb = alloc_skb(128, GFP_ATOMIC); |
| |
| if (!skb) |
| return -ENOBUFS; |
| |
| #ifdef CONFIG_IP_PIMSM |
| if (assert == IGMPMSG_WHOLEPKT) { |
| /* Ugly, but we have no choice with this interface. |
| Duplicate old header, fix ihl, length etc. |
| And all this only to mangle msg->im_msgtype and |
| to set msg->im_mbz to "mbz" :-) |
| */ |
| skb_push(skb, sizeof(struct iphdr)); |
| skb_reset_network_header(skb); |
| skb_reset_transport_header(skb); |
| msg = (struct igmpmsg *)skb_network_header(skb); |
| memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr)); |
| msg->im_msgtype = IGMPMSG_WHOLEPKT; |
| msg->im_mbz = 0; |
| msg->im_vif = net->ipv4.mroute_reg_vif_num; |
| ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2; |
| ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) + |
| sizeof(struct iphdr)); |
| } else |
| #endif |
| { |
| |
| /* |
| * Copy the IP header |
| */ |
| |
| skb->network_header = skb->tail; |
| skb_put(skb, ihl); |
| skb_copy_to_linear_data(skb, pkt->data, ihl); |
| ip_hdr(skb)->protocol = 0; /* Flag to the kernel this is a route add */ |
| msg = (struct igmpmsg *)skb_network_header(skb); |
| msg->im_vif = vifi; |
| skb_dst_set(skb, dst_clone(skb_dst(pkt))); |
| |
| /* |
| * Add our header |
| */ |
| |
| igmp=(struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); |
| igmp->type = |
| msg->im_msgtype = assert; |
| igmp->code = 0; |
| ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */ |
| skb->transport_header = skb->network_header; |
| } |
| |
| if (net->ipv4.mroute_sk == NULL) { |
| kfree_skb(skb); |
| return -EINVAL; |
| } |
| |
| /* |
| * Deliver to mrouted |
| */ |
| ret = sock_queue_rcv_skb(net->ipv4.mroute_sk, skb); |
| if (ret < 0) { |
| if (net_ratelimit()) |
| printk(KERN_WARNING "mroute: pending queue full, dropping entries.\n"); |
| kfree_skb(skb); |
| } |
| |
| return ret; |
| } |
| |
| /* |
| * Queue a packet for resolution. It gets locked cache entry! |
| */ |
| |
| static int |
| ipmr_cache_unresolved(struct net *net, vifi_t vifi, struct sk_buff *skb) |
| { |
| int err; |
| struct mfc_cache *c; |
| const struct iphdr *iph = ip_hdr(skb); |
| |
| spin_lock_bh(&mfc_unres_lock); |
| for (c=mfc_unres_queue; c; c=c->next) { |
| if (net_eq(mfc_net(c), net) && |
| c->mfc_mcastgrp == iph->daddr && |
| c->mfc_origin == iph->saddr) |
| break; |
| } |
| |
| if (c == NULL) { |
| /* |
| * Create a new entry if allowable |
| */ |
| |
| if (atomic_read(&net->ipv4.cache_resolve_queue_len) >= 10 || |
| (c = ipmr_cache_alloc_unres(net)) == NULL) { |
| spin_unlock_bh(&mfc_unres_lock); |
| |
| kfree_skb(skb); |
| return -ENOBUFS; |
| } |
| |
| /* |
| * Fill in the new cache entry |
| */ |
| c->mfc_parent = -1; |
| c->mfc_origin = iph->saddr; |
| c->mfc_mcastgrp = iph->daddr; |
| |
| /* |
| * Reflect first query at mrouted. |
| */ |
| err = ipmr_cache_report(net, skb, vifi, IGMPMSG_NOCACHE); |
| if (err < 0) { |
| /* If the report failed throw the cache entry |
| out - Brad Parker |
| */ |
| spin_unlock_bh(&mfc_unres_lock); |
| |
| ipmr_cache_free(c); |
| kfree_skb(skb); |
| return err; |
| } |
| |
| atomic_inc(&net->ipv4.cache_resolve_queue_len); |
| c->next = mfc_unres_queue; |
| mfc_unres_queue = c; |
| |
| mod_timer(&ipmr_expire_timer, c->mfc_un.unres.expires); |
| } |
| |
| /* |
| * 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; |
| } |
| |
| /* |
| * MFC cache manipulation by user space mroute daemon |
| */ |
| |
| static int ipmr_mfc_delete(struct net *net, struct mfcctl *mfc) |
| { |
| int line; |
| struct mfc_cache *c, **cp; |
| |
| line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); |
| |
| for (cp = &net->ipv4.mfc_cache_array[line]; |
| (c = *cp) != NULL; cp = &c->next) { |
| if (c->mfc_origin == mfc->mfcc_origin.s_addr && |
| c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) { |
| write_lock_bh(&mrt_lock); |
| *cp = c->next; |
| write_unlock_bh(&mrt_lock); |
| |
| ipmr_cache_free(c); |
| return 0; |
| } |
| } |
| return -ENOENT; |
| } |
| |
| static int ipmr_mfc_add(struct net *net, struct mfcctl *mfc, int mrtsock) |
| { |
| int line; |
| struct mfc_cache *uc, *c, **cp; |
| |
| line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); |
| |
| for (cp = &net->ipv4.mfc_cache_array[line]; |
| (c = *cp) != NULL; cp = &c->next) { |
| if (c->mfc_origin == mfc->mfcc_origin.s_addr && |
| c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) |
| break; |
| } |
| |
| if (c != NULL) { |
| write_lock_bh(&mrt_lock); |
| c->mfc_parent = mfc->mfcc_parent; |
| ipmr_update_thresholds(c, mfc->mfcc_ttls); |
| if (!mrtsock) |
| c->mfc_flags |= MFC_STATIC; |
| write_unlock_bh(&mrt_lock); |
| return 0; |
| } |
| |
| if (!ipv4_is_multicast(mfc->mfcc_mcastgrp.s_addr)) |
| return -EINVAL; |
| |
| c = ipmr_cache_alloc(net); |
| if (c == NULL) |
| return -ENOMEM; |
| |
| c->mfc_origin = mfc->mfcc_origin.s_addr; |
| c->mfc_mcastgrp = mfc->mfcc_mcastgrp.s_addr; |
| c->mfc_parent = mfc->mfcc_parent; |
| ipmr_update_thresholds(c, mfc->mfcc_ttls); |
| if (!mrtsock) |
| c->mfc_flags |= MFC_STATIC; |
| |
| write_lock_bh(&mrt_lock); |
| c->next = net->ipv4.mfc_cache_array[line]; |
| net->ipv4.mfc_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 (net_eq(mfc_net(uc), net) && |
| uc->mfc_origin == c->mfc_origin && |
| uc->mfc_mcastgrp == c->mfc_mcastgrp) { |
| *cp = uc->next; |
| atomic_dec(&net->ipv4.cache_resolve_queue_len); |
| break; |
| } |
| } |
| if (mfc_unres_queue == NULL) |
| del_timer(&ipmr_expire_timer); |
| spin_unlock_bh(&mfc_unres_lock); |
| |
| if (uc) { |
| ipmr_cache_resolve(uc, c); |
| ipmr_cache_free(uc); |
| } |
| return 0; |
| } |
| |
| /* |
| * Close the multicast socket, and clear the vif tables etc |
| */ |
| |
| static void mroute_clean_tables(struct net *net) |
| { |
| int i; |
| LIST_HEAD(list); |
| |
| /* |
| * Shut down all active vif entries |
| */ |
| for (i = 0; i < net->ipv4.maxvif; i++) { |
| if (!(net->ipv4.vif_table[i].flags&VIFF_STATIC)) |
| vif_delete(net, i, 0, &list); |
| } |
| unregister_netdevice_many(&list); |
| |
| /* |
| * Wipe the cache |
| */ |
| for (i=0; i<MFC_LINES; i++) { |
| struct mfc_cache *c, **cp; |
| |
| cp = &net->ipv4.mfc_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); |
| |
| ipmr_cache_free(c); |
| } |
| } |
| |
| if (atomic_read(&net->ipv4.cache_resolve_queue_len) != 0) { |
| struct mfc_cache *c, **cp; |
| |
| spin_lock_bh(&mfc_unres_lock); |
| cp = &mfc_unres_queue; |
| while ((c = *cp) != NULL) { |
| if (!net_eq(mfc_net(c), net)) { |
| cp = &c->next; |
| continue; |
| } |
| *cp = c->next; |
| |
| ipmr_destroy_unres(c); |
| } |
| spin_unlock_bh(&mfc_unres_lock); |
| } |
| } |
| |
| static void mrtsock_destruct(struct sock *sk) |
| { |
| struct net *net = sock_net(sk); |
| |
| rtnl_lock(); |
| if (sk == net->ipv4.mroute_sk) { |
| IPV4_DEVCONF_ALL(net, MC_FORWARDING)--; |
| |
| write_lock_bh(&mrt_lock); |
| net->ipv4.mroute_sk = NULL; |
| write_unlock_bh(&mrt_lock); |
| |
| mroute_clean_tables(net); |
| } |
| rtnl_unlock(); |
| } |
| |
| /* |
| * 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 ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen) |
| { |
| int ret; |
| struct vifctl vif; |
| struct mfcctl mfc; |
| struct net *net = sock_net(sk); |
| |
| if (optname != MRT_INIT) { |
| if (sk != net->ipv4.mroute_sk && !capable(CAP_NET_ADMIN)) |
| return -EACCES; |
| } |
| |
| switch (optname) { |
| case MRT_INIT: |
| if (sk->sk_type != SOCK_RAW || |
| inet_sk(sk)->inet_num != IPPROTO_IGMP) |
| return -EOPNOTSUPP; |
| if (optlen != sizeof(int)) |
| return -ENOPROTOOPT; |
| |
| rtnl_lock(); |
| if (net->ipv4.mroute_sk) { |
| rtnl_unlock(); |
| return -EADDRINUSE; |
| } |
| |
| ret = ip_ra_control(sk, 1, mrtsock_destruct); |
| if (ret == 0) { |
| write_lock_bh(&mrt_lock); |
| net->ipv4.mroute_sk = sk; |
| write_unlock_bh(&mrt_lock); |
| |
| IPV4_DEVCONF_ALL(net, MC_FORWARDING)++; |
| } |
| rtnl_unlock(); |
| return ret; |
| case MRT_DONE: |
| if (sk != net->ipv4.mroute_sk) |
| return -EACCES; |
| return ip_ra_control(sk, 0, NULL); |
| case MRT_ADD_VIF: |
| case MRT_DEL_VIF: |
| if (optlen != sizeof(vif)) |
| return -EINVAL; |
| if (copy_from_user(&vif, optval, sizeof(vif))) |
| return -EFAULT; |
| if (vif.vifc_vifi >= MAXVIFS) |
| return -ENFILE; |
| rtnl_lock(); |
| if (optname == MRT_ADD_VIF) { |
| ret = vif_add(net, &vif, sk == net->ipv4.mroute_sk); |
| } else { |
| ret = vif_delete(net, vif.vifc_vifi, 0, NULL); |
| } |
| rtnl_unlock(); |
| return ret; |
| |
| /* |
| * Manipulate the forwarding caches. These live |
| * in a sort of kernel/user symbiosis. |
| */ |
| case MRT_ADD_MFC: |
| case MRT_DEL_MFC: |
| if (optlen != sizeof(mfc)) |
| return -EINVAL; |
| if (copy_from_user(&mfc, optval, sizeof(mfc))) |
| return -EFAULT; |
| rtnl_lock(); |
| if (optname == MRT_DEL_MFC) |
| ret = ipmr_mfc_delete(net, &mfc); |
| else |
| ret = ipmr_mfc_add(net, &mfc, sk == net->ipv4.mroute_sk); |
| rtnl_unlock(); |
| return ret; |
| /* |
| * Control PIM assert. |
| */ |
| case MRT_ASSERT: |
| { |
| int v; |
| if (get_user(v,(int __user *)optval)) |
| return -EFAULT; |
| net->ipv4.mroute_do_assert = (v) ? 1 : 0; |
| return 0; |
| } |
| #ifdef CONFIG_IP_PIMSM |
| case MRT_PIM: |
| { |
| int v; |
| |
| if (get_user(v,(int __user *)optval)) |
| return -EFAULT; |
| v = (v) ? 1 : 0; |
| |
| rtnl_lock(); |
| ret = 0; |
| if (v != net->ipv4.mroute_do_pim) { |
| net->ipv4.mroute_do_pim = v; |
| net->ipv4.mroute_do_assert = v; |
| } |
| rtnl_unlock(); |
| return ret; |
| } |
| #endif |
| /* |
| * Spurious command, or MRT_VERSION which you cannot |
| * set. |
| */ |
| default: |
| return -ENOPROTOOPT; |
| } |
| } |
| |
| /* |
| * Getsock opt support for the multicast routing system. |
| */ |
| |
| int ip_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, int __user *optlen) |
| { |
| int olr; |
| int val; |
| struct net *net = sock_net(sk); |
| |
| if (optname != MRT_VERSION && |
| #ifdef CONFIG_IP_PIMSM |
| optname!=MRT_PIM && |
| #endif |
| optname!=MRT_ASSERT) |
| return -ENOPROTOOPT; |
| |
| if (get_user(olr, optlen)) |
| return -EFAULT; |
| |
| olr = min_t(unsigned int, olr, sizeof(int)); |
| if (olr < 0) |
| return -EINVAL; |
| |
| if (put_user(olr, optlen)) |
| return -EFAULT; |
| if (optname == MRT_VERSION) |
| val = 0x0305; |
| #ifdef CONFIG_IP_PIMSM |
| else if (optname == MRT_PIM) |
| val = net->ipv4.mroute_do_pim; |
| #endif |
| else |
| val = net->ipv4.mroute_do_assert; |
| if (copy_to_user(optval, &val, olr)) |
| return -EFAULT; |
| return 0; |
| } |
| |
| /* |
| * The IP multicast ioctl support routines. |
| */ |
| |
| int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg) |
| { |
| struct sioc_sg_req sr; |
| struct sioc_vif_req vr; |
| struct vif_device *vif; |
| struct mfc_cache *c; |
| struct net *net = sock_net(sk); |
| |
| switch (cmd) { |
| case SIOCGETVIFCNT: |
| if (copy_from_user(&vr, arg, sizeof(vr))) |
| return -EFAULT; |
| if (vr.vifi >= net->ipv4.maxvif) |
| return -EINVAL; |
| read_lock(&mrt_lock); |
| vif = &net->ipv4.vif_table[vr.vifi]; |
| if (VIF_EXISTS(net, vr.vifi)) { |
| 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: |
| if (copy_from_user(&sr, arg, sizeof(sr))) |
| return -EFAULT; |
| |
| read_lock(&mrt_lock); |
| c = ipmr_cache_find(net, sr.src.s_addr, sr.grp.s_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 int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr) |
| { |
| struct net_device *dev = ptr; |
| struct net *net = dev_net(dev); |
| struct vif_device *v; |
| int ct; |
| LIST_HEAD(list); |
| |
| if (event != NETDEV_UNREGISTER) |
| return NOTIFY_DONE; |
| v = &net->ipv4.vif_table[0]; |
| for (ct = 0; ct < net->ipv4.maxvif; ct++, v++) { |
| if (v->dev == dev) |
| vif_delete(net, ct, 1, &list); |
| } |
| unregister_netdevice_many(&list); |
| return NOTIFY_DONE; |
| } |
| |
| |
| static struct notifier_block ip_mr_notifier = { |
| .notifier_call = ipmr_device_event, |
| }; |
| |
| /* |
| * Encapsulate a packet by attaching a valid IPIP header to it. |
| * This avoids tunnel drivers and other mess and gives us the speed so |
| * important for multicast video. |
| */ |
| |
| static void ip_encap(struct sk_buff *skb, __be32 saddr, __be32 daddr) |
| { |
| struct iphdr *iph; |
| struct iphdr *old_iph = ip_hdr(skb); |
| |
| skb_push(skb, sizeof(struct iphdr)); |
| skb->transport_header = skb->network_header; |
| skb_reset_network_header(skb); |
| iph = ip_hdr(skb); |
| |
| iph->version = 4; |
| iph->tos = old_iph->tos; |
| iph->ttl = old_iph->ttl; |
| iph->frag_off = 0; |
| iph->daddr = daddr; |
| iph->saddr = saddr; |
| iph->protocol = IPPROTO_IPIP; |
| iph->ihl = 5; |
| iph->tot_len = htons(skb->len); |
| ip_select_ident(iph, skb_dst(skb), NULL); |
| ip_send_check(iph); |
| |
| memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
| nf_reset(skb); |
| } |
| |
| static inline int ipmr_forward_finish(struct sk_buff *skb) |
| { |
| struct ip_options * opt = &(IPCB(skb)->opt); |
| |
| IP_INC_STATS_BH(dev_net(skb_dst(skb)->dev), IPSTATS_MIB_OUTFORWDATAGRAMS); |
| |
| if (unlikely(opt->optlen)) |
| ip_forward_options(skb); |
| |
| return dst_output(skb); |
| } |
| |
| /* |
| * Processing handlers for ipmr_forward |
| */ |
| |
| static void ipmr_queue_xmit(struct sk_buff *skb, struct mfc_cache *c, int vifi) |
| { |
| struct net *net = mfc_net(c); |
| const struct iphdr *iph = ip_hdr(skb); |
| struct vif_device *vif = &net->ipv4.vif_table[vifi]; |
| struct net_device *dev; |
| struct rtable *rt; |
| int encap = 0; |
| |
| if (vif->dev == NULL) |
| goto out_free; |
| |
| #ifdef CONFIG_IP_PIMSM |
| if (vif->flags & VIFF_REGISTER) { |
| vif->pkt_out++; |
| vif->bytes_out += skb->len; |
| vif->dev->stats.tx_bytes += skb->len; |
| vif->dev->stats.tx_packets++; |
| ipmr_cache_report(net, skb, vifi, IGMPMSG_WHOLEPKT); |
| goto out_free; |
| } |
| #endif |
| |
| if (vif->flags&VIFF_TUNNEL) { |
| struct flowi fl = { .oif = vif->link, |
| .nl_u = { .ip4_u = |
| { .daddr = vif->remote, |
| .saddr = vif->local, |
| .tos = RT_TOS(iph->tos) } }, |
| .proto = IPPROTO_IPIP }; |
| if (ip_route_output_key(net, &rt, &fl)) |
| goto out_free; |
| encap = sizeof(struct iphdr); |
| } else { |
| struct flowi fl = { .oif = vif->link, |
| .nl_u = { .ip4_u = |
| { .daddr = iph->daddr, |
| .tos = RT_TOS(iph->tos) } }, |
| .proto = IPPROTO_IPIP }; |
| if (ip_route_output_key(net, &rt, &fl)) |
| goto out_free; |
| } |
| |
| dev = rt->u.dst.dev; |
| |
| if (skb->len+encap > dst_mtu(&rt->u.dst) && (ntohs(iph->frag_off) & IP_DF)) { |
| /* Do not fragment multicasts. Alas, IPv4 does not |
| allow to send ICMP, so that packets will disappear |
| to blackhole. |
| */ |
| |
| IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_FRAGFAILS); |
| ip_rt_put(rt); |
| goto out_free; |
| } |
| |
| encap += LL_RESERVED_SPACE(dev) + rt->u.dst.header_len; |
| |
| if (skb_cow(skb, encap)) { |
| ip_rt_put(rt); |
| goto out_free; |
| } |
| |
| vif->pkt_out++; |
| vif->bytes_out += skb->len; |
| |
| skb_dst_drop(skb); |
| skb_dst_set(skb, &rt->u.dst); |
| ip_decrease_ttl(ip_hdr(skb)); |
| |
| /* FIXME: forward and output firewalls used to be called here. |
| * What do we do with netfilter? -- RR */ |
| if (vif->flags & VIFF_TUNNEL) { |
| ip_encap(skb, vif->local, vif->remote); |
| /* FIXME: extra output firewall step used to be here. --RR */ |
| vif->dev->stats.tx_packets++; |
| vif->dev->stats.tx_bytes += skb->len; |
| } |
| |
| IPCB(skb)->flags |= IPSKB_FORWARDED; |
| |
| /* |
| * 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. |
| */ |
| NF_HOOK(PF_INET, NF_INET_FORWARD, skb, skb->dev, dev, |
| ipmr_forward_finish); |
| return; |
| |
| out_free: |
| kfree_skb(skb); |
| return; |
| } |
| |
| static int ipmr_find_vif(struct net_device *dev) |
| { |
| struct net *net = dev_net(dev); |
| int ct; |
| for (ct = net->ipv4.maxvif-1; ct >= 0; ct--) { |
| if (net->ipv4.vif_table[ct].dev == dev) |
| break; |
| } |
| return ct; |
| } |
| |
| /* "local" means that we should preserve one skb (for local delivery) */ |
| |
| static int ip_mr_forward(struct sk_buff *skb, struct mfc_cache *cache, int local) |
| { |
| int psend = -1; |
| int vif, ct; |
| struct net *net = mfc_net(cache); |
| |
| vif = cache->mfc_parent; |
| cache->mfc_un.res.pkt++; |
| cache->mfc_un.res.bytes += skb->len; |
| |
| /* |
| * Wrong interface: drop packet and (maybe) send PIM assert. |
| */ |
| if (net->ipv4.vif_table[vif].dev != skb->dev) { |
| int true_vifi; |
| |
| if (skb_rtable(skb)->fl.iif == 0) { |
| /* It is our own packet, looped back. |
| Very complicated situation... |
| |
| The best workaround until routing daemons will be |
| fixed is not to redistribute packet, if it was |
| send through wrong interface. It means, that |
| multicast applications WILL NOT work for |
| (S,G), which have default multicast route pointing |
| to wrong oif. In any case, it is not a good |
| idea to use multicasting applications on router. |
| */ |
| goto dont_forward; |
| } |
| |
| cache->mfc_un.res.wrong_if++; |
| true_vifi = ipmr_find_vif(skb->dev); |
| |
| if (true_vifi >= 0 && net->ipv4.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 |
| */ |
| (net->ipv4.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; |
| ipmr_cache_report(net, skb, true_vifi, IGMPMSG_WRONGVIF); |
| } |
| goto dont_forward; |
| } |
| |
| net->ipv4.vif_table[vif].pkt_in++; |
| net->ipv4.vif_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 (ip_hdr(skb)->ttl > cache->mfc_un.res.ttls[ct]) { |
| if (psend != -1) { |
| struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); |
| if (skb2) |
| ipmr_queue_xmit(skb2, cache, psend); |
| } |
| psend = ct; |
| } |
| } |
| if (psend != -1) { |
| if (local) { |
| struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); |
| if (skb2) |
| ipmr_queue_xmit(skb2, cache, psend); |
| } else { |
| ipmr_queue_xmit(skb, cache, psend); |
| return 0; |
| } |
| } |
| |
| dont_forward: |
| if (!local) |
| kfree_skb(skb); |
| return 0; |
| } |
| |
| |
| /* |
| * Multicast packets for forwarding arrive here |
| */ |
| |
| int ip_mr_input(struct sk_buff *skb) |
| { |
| struct mfc_cache *cache; |
| struct net *net = dev_net(skb->dev); |
| int local = skb_rtable(skb)->rt_flags & RTCF_LOCAL; |
| |
| /* Packet is looped back after forward, it should not be |
| forwarded second time, but still can be delivered locally. |
| */ |
| if (IPCB(skb)->flags&IPSKB_FORWARDED) |
| goto dont_forward; |
| |
| if (!local) { |
| if (IPCB(skb)->opt.router_alert) { |
| if (ip_call_ra_chain(skb)) |
| return 0; |
| } else if (ip_hdr(skb)->protocol == IPPROTO_IGMP){ |
| /* IGMPv1 (and broken IGMPv2 implementations sort of |
| Cisco IOS <= 11.2(8)) do not put router alert |
| option to IGMP packets destined to routable |
| groups. It is very bad, because it means |
| that we can forward NO IGMP messages. |
| */ |
| read_lock(&mrt_lock); |
| if (net->ipv4.mroute_sk) { |
| nf_reset(skb); |
| raw_rcv(net->ipv4.mroute_sk, skb); |
| read_unlock(&mrt_lock); |
| return 0; |
| } |
| read_unlock(&mrt_lock); |
| } |
| } |
| |
| read_lock(&mrt_lock); |
| cache = ipmr_cache_find(net, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr); |
| |
| /* |
| * No usable cache entry |
| */ |
| if (cache == NULL) { |
| int vif; |
| |
| if (local) { |
| struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); |
| ip_local_deliver(skb); |
| if (skb2 == NULL) { |
| read_unlock(&mrt_lock); |
| return -ENOBUFS; |
| } |
| skb = skb2; |
| } |
| |
| vif = ipmr_find_vif(skb->dev); |
| if (vif >= 0) { |
| int err = ipmr_cache_unresolved(net, vif, skb); |
| read_unlock(&mrt_lock); |
| |
| return err; |
| } |
| read_unlock(&mrt_lock); |
| kfree_skb(skb); |
| return -ENODEV; |
| } |
| |
| ip_mr_forward(skb, cache, local); |
| |
| read_unlock(&mrt_lock); |
| |
| if (local) |
| return ip_local_deliver(skb); |
| |
| return 0; |
| |
| dont_forward: |
| if (local) |
| return ip_local_deliver(skb); |
| kfree_skb(skb); |
| return 0; |
| } |
| |
| #ifdef CONFIG_IP_PIMSM |
| static int __pim_rcv(struct sk_buff *skb, unsigned int pimlen) |
| { |
| struct net_device *reg_dev = NULL; |
| struct iphdr *encap; |
| struct net *net = dev_net(skb->dev); |
| |
| encap = (struct iphdr *)(skb_transport_header(skb) + pimlen); |
| /* |
| Check that: |
| a. packet is really destinted to a multicast group |
| b. packet is not a NULL-REGISTER |
| c. packet is not truncated |
| */ |
| if (!ipv4_is_multicast(encap->daddr) || |
| encap->tot_len == 0 || |
| ntohs(encap->tot_len) + pimlen > skb->len) |
| return 1; |
| |
| read_lock(&mrt_lock); |
| if (net->ipv4.mroute_reg_vif_num >= 0) |
| reg_dev = net->ipv4.vif_table[net->ipv4.mroute_reg_vif_num].dev; |
| if (reg_dev) |
| dev_hold(reg_dev); |
| read_unlock(&mrt_lock); |
| |
| if (reg_dev == NULL) |
| return 1; |
| |
| 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; |
| skb_dst_drop(skb); |
| reg_dev->stats.rx_bytes += skb->len; |
| reg_dev->stats.rx_packets++; |
| nf_reset(skb); |
| netif_rx(skb); |
| dev_put(reg_dev); |
| |
| return 0; |
| } |
| #endif |
| |
| #ifdef CONFIG_IP_PIMSM_V1 |
| /* |
| * Handle IGMP messages of PIMv1 |
| */ |
| |
| int pim_rcv_v1(struct sk_buff * skb) |
| { |
| struct igmphdr *pim; |
| struct net *net = dev_net(skb->dev); |
| |
| if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr))) |
| goto drop; |
| |
| pim = igmp_hdr(skb); |
| |
| if (!net->ipv4.mroute_do_pim || |
| pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER) |
| goto drop; |
| |
| if (__pim_rcv(skb, sizeof(*pim))) { |
| drop: |
| kfree_skb(skb); |
| } |
| return 0; |
| } |
| #endif |
| |
| #ifdef CONFIG_IP_PIMSM_V2 |
| static int pim_rcv(struct sk_buff * skb) |
| { |
| struct pimreghdr *pim; |
| |
| if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr))) |
| 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; |
| |
| if (__pim_rcv(skb, sizeof(*pim))) { |
| drop: |
| kfree_skb(skb); |
| } |
| return 0; |
| } |
| #endif |
| |
| static int |
| ipmr_fill_mroute(struct sk_buff *skb, struct mfc_cache *c, struct rtmsg *rtm) |
| { |
| int ct; |
| struct rtnexthop *nhp; |
| struct net *net = mfc_net(c); |
| struct net_device *dev = net->ipv4.vif_table[c->mfc_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 = net->ipv4.vif_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 ipmr_get_route(struct net *net, |
| struct sk_buff *skb, struct rtmsg *rtm, int nowait) |
| { |
| int err; |
| struct mfc_cache *cache; |
| struct rtable *rt = skb_rtable(skb); |
| |
| read_lock(&mrt_lock); |
| cache = ipmr_cache_find(net, rt->rt_src, rt->rt_dst); |
| |
| if (cache == NULL) { |
| struct sk_buff *skb2; |
| struct iphdr *iph; |
| struct net_device *dev; |
| int vif; |
| |
| if (nowait) { |
| read_unlock(&mrt_lock); |
| return -EAGAIN; |
| } |
| |
| dev = skb->dev; |
| if (dev == NULL || (vif = ipmr_find_vif(dev)) < 0) { |
| read_unlock(&mrt_lock); |
| return -ENODEV; |
| } |
| skb2 = skb_clone(skb, GFP_ATOMIC); |
| if (!skb2) { |
| read_unlock(&mrt_lock); |
| return -ENOMEM; |
| } |
| |
| skb_push(skb2, sizeof(struct iphdr)); |
| skb_reset_network_header(skb2); |
| iph = ip_hdr(skb2); |
| iph->ihl = sizeof(struct iphdr) >> 2; |
| iph->saddr = rt->rt_src; |
| iph->daddr = rt->rt_dst; |
| iph->version = 0; |
| err = ipmr_cache_unresolved(net, vif, skb2); |
| read_unlock(&mrt_lock); |
| return err; |
| } |
| |
| if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY)) |
| cache->mfc_flags |= MFC_NOTIFY; |
| err = ipmr_fill_mroute(skb, cache, rtm); |
| read_unlock(&mrt_lock); |
| return err; |
| } |
| |
| #ifdef CONFIG_PROC_FS |
| /* |
| * The /proc interfaces to multicast routing /proc/ip_mr_cache /proc/ip_mr_vif |
| */ |
| struct ipmr_vif_iter { |
| struct seq_net_private p; |
| int ct; |
| }; |
| |
| static struct vif_device *ipmr_vif_seq_idx(struct net *net, |
| struct ipmr_vif_iter *iter, |
| loff_t pos) |
| { |
| for (iter->ct = 0; iter->ct < net->ipv4.maxvif; ++iter->ct) { |
| if (!VIF_EXISTS(net, iter->ct)) |
| continue; |
| if (pos-- == 0) |
| return &net->ipv4.vif_table[iter->ct]; |
| } |
| return NULL; |
| } |
| |
| static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos) |
| __acquires(mrt_lock) |
| { |
| struct net *net = seq_file_net(seq); |
| |
| read_lock(&mrt_lock); |
| return *pos ? ipmr_vif_seq_idx(net, seq->private, *pos - 1) |
| : SEQ_START_TOKEN; |
| } |
| |
| static void *ipmr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| { |
| struct ipmr_vif_iter *iter = seq->private; |
| struct net *net = seq_file_net(seq); |
| |
| ++*pos; |
| if (v == SEQ_START_TOKEN) |
| return ipmr_vif_seq_idx(net, iter, 0); |
| |
| while (++iter->ct < net->ipv4.maxvif) { |
| if (!VIF_EXISTS(net, iter->ct)) |
| continue; |
| return &net->ipv4.vif_table[iter->ct]; |
| } |
| return NULL; |
| } |
| |
| static void ipmr_vif_seq_stop(struct seq_file *seq, void *v) |
| __releases(mrt_lock) |
| { |
| read_unlock(&mrt_lock); |
| } |
| |
| static int ipmr_vif_seq_show(struct seq_file *seq, void *v) |
| { |
| struct net *net = seq_file_net(seq); |
| |
| if (v == SEQ_START_TOKEN) { |
| seq_puts(seq, |
| "Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n"); |
| } else { |
| const struct vif_device *vif = v; |
| const char *name = vif->dev ? vif->dev->name : "none"; |
| |
| seq_printf(seq, |
| "%2Zd %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n", |
| vif - net->ipv4.vif_table, |
| name, vif->bytes_in, vif->pkt_in, |
| vif->bytes_out, vif->pkt_out, |
| vif->flags, vif->local, vif->remote); |
| } |
| return 0; |
| } |
| |
| static const struct seq_operations ipmr_vif_seq_ops = { |
| .start = ipmr_vif_seq_start, |
| .next = ipmr_vif_seq_next, |
| .stop = ipmr_vif_seq_stop, |
| .show = ipmr_vif_seq_show, |
| }; |
| |
| static int ipmr_vif_open(struct inode *inode, struct file *file) |
| { |
| return seq_open_net(inode, file, &ipmr_vif_seq_ops, |
| sizeof(struct ipmr_vif_iter)); |
| } |
| |
| static const struct file_operations ipmr_vif_fops = { |
| .owner = THIS_MODULE, |
| .open = ipmr_vif_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = seq_release_net, |
| }; |
| |
| struct ipmr_mfc_iter { |
| struct seq_net_private p; |
| struct mfc_cache **cache; |
| int ct; |
| }; |
| |
| |
| static struct mfc_cache *ipmr_mfc_seq_idx(struct net *net, |
| struct ipmr_mfc_iter *it, loff_t pos) |
| { |
| struct mfc_cache *mfc; |
| |
| it->cache = net->ipv4.mfc_cache_array; |
| read_lock(&mrt_lock); |
| for (it->ct = 0; it->ct < MFC_LINES; it->ct++) |
| for (mfc = net->ipv4.mfc_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 (net_eq(mfc_net(mfc), net) && |
| pos-- == 0) |
| return mfc; |
| spin_unlock_bh(&mfc_unres_lock); |
| |
| it->cache = NULL; |
| return NULL; |
| } |
| |
| |
| static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) |
| { |
| struct ipmr_mfc_iter *it = seq->private; |
| struct net *net = seq_file_net(seq); |
| |
| it->cache = NULL; |
| it->ct = 0; |
| return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1) |
| : SEQ_START_TOKEN; |
| } |
| |
| static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| { |
| struct mfc_cache *mfc = v; |
| struct ipmr_mfc_iter *it = seq->private; |
| struct net *net = seq_file_net(seq); |
| |
| ++*pos; |
| |
| if (v == SEQ_START_TOKEN) |
| return ipmr_mfc_seq_idx(net, seq->private, 0); |
| |
| if (mfc->next) |
| return mfc->next; |
| |
| if (it->cache == &mfc_unres_queue) |
| goto end_of_list; |
| |
| BUG_ON(it->cache != net->ipv4.mfc_cache_array); |
| |
| while (++it->ct < MFC_LINES) { |
| mfc = net->ipv4.mfc_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; |
| while (mfc && !net_eq(mfc_net(mfc), net)) |
| mfc = mfc->next; |
| 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; |
| struct net *net = seq_file_net(seq); |
| |
| if (it->cache == &mfc_unres_queue) |
| spin_unlock_bh(&mfc_unres_lock); |
| else if (it->cache == net->ipv4.mfc_cache_array) |
| read_unlock(&mrt_lock); |
| } |
| |
| static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) |
| { |
| int n; |
| struct net *net = seq_file_net(seq); |
| |
| if (v == SEQ_START_TOKEN) { |
| seq_puts(seq, |
| "Group Origin Iif Pkts Bytes Wrong Oifs\n"); |
| } else { |
| const struct mfc_cache *mfc = v; |
| const struct ipmr_mfc_iter *it = seq->private; |
| |
| seq_printf(seq, "%08lX %08lX %-3hd", |
| (unsigned long) mfc->mfc_mcastgrp, |
| (unsigned long) mfc->mfc_origin, |
| mfc->mfc_parent); |
| |
| if (it->cache != &mfc_unres_queue) { |
| seq_printf(seq, " %8lu %8lu %8lu", |
| mfc->mfc_un.res.pkt, |
| mfc->mfc_un.res.bytes, |
| mfc->mfc_un.res.wrong_if); |
| for (n = mfc->mfc_un.res.minvif; |
| n < mfc->mfc_un.res.maxvif; n++ ) { |
| if (VIF_EXISTS(net, n) && |
| mfc->mfc_un.res.ttls[n] < 255) |
| seq_printf(seq, |
| " %2d:%-3d", |
| n, mfc->mfc_un.res.ttls[n]); |
| } |
| } else { |
| /* unresolved mfc_caches don't contain |
| * pkt, bytes and wrong_if values |
| */ |
| seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul); |
| } |
| seq_putc(seq, '\n'); |
| } |
| return 0; |
| } |
| |
| static const 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_net(inode, file, &ipmr_mfc_seq_ops, |
| sizeof(struct ipmr_mfc_iter)); |
| } |
| |
| static const struct file_operations ipmr_mfc_fops = { |
| .owner = THIS_MODULE, |
| .open = ipmr_mfc_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = seq_release_net, |
| }; |
| #endif |
| |
| #ifdef CONFIG_IP_PIMSM_V2 |
| static const struct net_protocol pim_protocol = { |
| .handler = pim_rcv, |
| .netns_ok = 1, |
| }; |
| #endif |
| |
| |
| /* |
| * Setup for IP multicast routing |
| */ |
| static int __net_init ipmr_net_init(struct net *net) |
| { |
| int err = 0; |
| |
| net->ipv4.vif_table = kcalloc(MAXVIFS, sizeof(struct vif_device), |
| GFP_KERNEL); |
| if (!net->ipv4.vif_table) { |
| err = -ENOMEM; |
| goto fail; |
| } |
| |
| /* Forwarding cache */ |
| net->ipv4.mfc_cache_array = kcalloc(MFC_LINES, |
| sizeof(struct mfc_cache *), |
| GFP_KERNEL); |
| if (!net->ipv4.mfc_cache_array) { |
| err = -ENOMEM; |
| goto fail_mfc_cache; |
| } |
| |
| #ifdef CONFIG_IP_PIMSM |
| net->ipv4.mroute_reg_vif_num = -1; |
| #endif |
| |
| #ifdef CONFIG_PROC_FS |
| err = -ENOMEM; |
| if (!proc_net_fops_create(net, "ip_mr_vif", 0, &ipmr_vif_fops)) |
| goto proc_vif_fail; |
| if (!proc_net_fops_create(net, "ip_mr_cache", 0, &ipmr_mfc_fops)) |
| goto proc_cache_fail; |
| #endif |
| return 0; |
| |
| #ifdef CONFIG_PROC_FS |
| proc_cache_fail: |
| proc_net_remove(net, "ip_mr_vif"); |
| proc_vif_fail: |
| kfree(net->ipv4.mfc_cache_array); |
| #endif |
| fail_mfc_cache: |
| kfree(net->ipv4.vif_table); |
| fail: |
| return err; |
| } |
| |
| static void __net_exit ipmr_net_exit(struct net *net) |
| { |
| #ifdef CONFIG_PROC_FS |
| proc_net_remove(net, "ip_mr_cache"); |
| proc_net_remove(net, "ip_mr_vif"); |
| #endif |
| kfree(net->ipv4.mfc_cache_array); |
| kfree(net->ipv4.vif_table); |
| } |
| |
| static struct pernet_operations ipmr_net_ops = { |
| .init = ipmr_net_init, |
| .exit = ipmr_net_exit, |
| }; |
| |
| int __init ip_mr_init(void) |
| { |
| int err; |
| |
| mrt_cachep = kmem_cache_create("ip_mrt_cache", |
| sizeof(struct mfc_cache), |
| 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
| NULL); |
| if (!mrt_cachep) |
| return -ENOMEM; |
| |
| err = register_pernet_subsys(&ipmr_net_ops); |
| if (err) |
| goto reg_pernet_fail; |
| |
| setup_timer(&ipmr_expire_timer, ipmr_expire_process, 0); |
| err = register_netdevice_notifier(&ip_mr_notifier); |
| if (err) |
| goto reg_notif_fail; |
| #ifdef CONFIG_IP_PIMSM_V2 |
| if (inet_add_protocol(&pim_protocol, IPPROTO_PIM) < 0) { |
| printk(KERN_ERR "ip_mr_init: can't add PIM protocol\n"); |
| err = -EAGAIN; |
| goto add_proto_fail; |
| } |
| #endif |
| return 0; |
| |
| #ifdef CONFIG_IP_PIMSM_V2 |
| add_proto_fail: |
| unregister_netdevice_notifier(&ip_mr_notifier); |
| #endif |
| reg_notif_fail: |
| del_timer(&ipmr_expire_timer); |
| unregister_pernet_subsys(&ipmr_net_ops); |
| reg_pernet_fail: |
| kmem_cache_destroy(mrt_cachep); |
| return err; |
| } |