| /* |
| * DECnet An implementation of the DECnet protocol suite for the LINUX |
| * operating system. DECnet is implemented using the BSD Socket |
| * interface as the means of communication with the user level. |
| * |
| * DECnet Routing Functions (Endnode and Router) |
| * |
| * Authors: Steve Whitehouse <SteveW@ACM.org> |
| * Eduardo Marcelo Serrat <emserrat@geocities.com> |
| * |
| * Changes: |
| * Steve Whitehouse : Fixes to allow "intra-ethernet" and |
| * "return-to-sender" bits on outgoing |
| * packets. |
| * Steve Whitehouse : Timeouts for cached routes. |
| * Steve Whitehouse : Use dst cache for input routes too. |
| * Steve Whitehouse : Fixed error values in dn_send_skb. |
| * Steve Whitehouse : Rework routing functions to better fit |
| * DECnet routing design |
| * Alexey Kuznetsov : New SMP locking |
| * Steve Whitehouse : More SMP locking changes & dn_cache_dump() |
| * Steve Whitehouse : Prerouting NF hook, now really is prerouting. |
| * Fixed possible skb leak in rtnetlink funcs. |
| * Steve Whitehouse : Dave Miller's dynamic hash table sizing and |
| * Alexey Kuznetsov's finer grained locking |
| * from ipv4/route.c. |
| * Steve Whitehouse : Routing is now starting to look like a |
| * sensible set of code now, mainly due to |
| * my copying the IPv4 routing code. The |
| * hooks here are modified and will continue |
| * to evolve for a while. |
| * Steve Whitehouse : Real SMP at last :-) Also new netfilter |
| * stuff. Look out raw sockets your days |
| * are numbered! |
| * Steve Whitehouse : Added return-to-sender functions. Added |
| * backlog congestion level return codes. |
| * Steve Whitehouse : Fixed bug where routes were set up with |
| * no ref count on net devices. |
| * Steve Whitehouse : RCU for the route cache |
| * Steve Whitehouse : Preparations for the flow cache |
| * Steve Whitehouse : Prepare for nonlinear skbs |
| */ |
| |
| /****************************************************************************** |
| (c) 1995-1998 E.M. Serrat emserrat@geocities.com |
| |
| 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 |
| any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| *******************************************************************************/ |
| |
| #include <linux/errno.h> |
| #include <linux/types.h> |
| #include <linux/socket.h> |
| #include <linux/in.h> |
| #include <linux/kernel.h> |
| #include <linux/sockios.h> |
| #include <linux/net.h> |
| #include <linux/netdevice.h> |
| #include <linux/inet.h> |
| #include <linux/route.h> |
| #include <linux/in_route.h> |
| #include <linux/slab.h> |
| #include <net/sock.h> |
| #include <linux/mm.h> |
| #include <linux/proc_fs.h> |
| #include <linux/seq_file.h> |
| #include <linux/init.h> |
| #include <linux/rtnetlink.h> |
| #include <linux/string.h> |
| #include <linux/netfilter_decnet.h> |
| #include <linux/rcupdate.h> |
| #include <linux/times.h> |
| #include <linux/export.h> |
| #include <asm/errno.h> |
| #include <net/net_namespace.h> |
| #include <net/netlink.h> |
| #include <net/neighbour.h> |
| #include <net/dst.h> |
| #include <net/flow.h> |
| #include <net/fib_rules.h> |
| #include <net/dn.h> |
| #include <net/dn_dev.h> |
| #include <net/dn_nsp.h> |
| #include <net/dn_route.h> |
| #include <net/dn_neigh.h> |
| #include <net/dn_fib.h> |
| |
| struct dn_rt_hash_bucket |
| { |
| struct dn_route __rcu *chain; |
| spinlock_t lock; |
| }; |
| |
| extern struct neigh_table dn_neigh_table; |
| |
| |
| static unsigned char dn_hiord_addr[6] = {0xAA,0x00,0x04,0x00,0x00,0x00}; |
| |
| static const int dn_rt_min_delay = 2 * HZ; |
| static const int dn_rt_max_delay = 10 * HZ; |
| static const int dn_rt_mtu_expires = 10 * 60 * HZ; |
| |
| static unsigned long dn_rt_deadline; |
| |
| static int dn_dst_gc(struct dst_ops *ops); |
| static struct dst_entry *dn_dst_check(struct dst_entry *, __u32); |
| static unsigned int dn_dst_default_advmss(const struct dst_entry *dst); |
| static unsigned int dn_dst_mtu(const struct dst_entry *dst); |
| static void dn_dst_destroy(struct dst_entry *); |
| static void dn_dst_ifdown(struct dst_entry *, struct net_device *dev, int how); |
| static struct dst_entry *dn_dst_negative_advice(struct dst_entry *); |
| static void dn_dst_link_failure(struct sk_buff *); |
| static void dn_dst_update_pmtu(struct dst_entry *dst, u32 mtu); |
| static void dn_dst_redirect(struct dst_entry *dst, struct sk_buff *skb); |
| static struct neighbour *dn_dst_neigh_lookup(const struct dst_entry *dst, |
| struct sk_buff *skb, |
| const void *daddr); |
| static int dn_route_input(struct sk_buff *); |
| static void dn_run_flush(unsigned long dummy); |
| |
| static struct dn_rt_hash_bucket *dn_rt_hash_table; |
| static unsigned int dn_rt_hash_mask; |
| |
| static struct timer_list dn_route_timer; |
| static DEFINE_TIMER(dn_rt_flush_timer, dn_run_flush, 0, 0); |
| int decnet_dst_gc_interval = 2; |
| |
| static struct dst_ops dn_dst_ops = { |
| .family = PF_DECnet, |
| .protocol = cpu_to_be16(ETH_P_DNA_RT), |
| .gc_thresh = 128, |
| .gc = dn_dst_gc, |
| .check = dn_dst_check, |
| .default_advmss = dn_dst_default_advmss, |
| .mtu = dn_dst_mtu, |
| .cow_metrics = dst_cow_metrics_generic, |
| .destroy = dn_dst_destroy, |
| .ifdown = dn_dst_ifdown, |
| .negative_advice = dn_dst_negative_advice, |
| .link_failure = dn_dst_link_failure, |
| .update_pmtu = dn_dst_update_pmtu, |
| .redirect = dn_dst_redirect, |
| .neigh_lookup = dn_dst_neigh_lookup, |
| }; |
| |
| static void dn_dst_destroy(struct dst_entry *dst) |
| { |
| struct dn_route *rt = (struct dn_route *) dst; |
| |
| if (rt->n) |
| neigh_release(rt->n); |
| dst_destroy_metrics_generic(dst); |
| } |
| |
| static void dn_dst_ifdown(struct dst_entry *dst, struct net_device *dev, int how) |
| { |
| if (how) { |
| struct dn_route *rt = (struct dn_route *) dst; |
| struct neighbour *n = rt->n; |
| |
| if (n && n->dev == dev) { |
| n->dev = dev_net(dev)->loopback_dev; |
| dev_hold(n->dev); |
| dev_put(dev); |
| } |
| } |
| } |
| |
| static __inline__ unsigned int dn_hash(__le16 src, __le16 dst) |
| { |
| __u16 tmp = (__u16 __force)(src ^ dst); |
| tmp ^= (tmp >> 3); |
| tmp ^= (tmp >> 5); |
| tmp ^= (tmp >> 10); |
| return dn_rt_hash_mask & (unsigned int)tmp; |
| } |
| |
| static inline void dnrt_free(struct dn_route *rt) |
| { |
| call_rcu_bh(&rt->dst.rcu_head, dst_rcu_free); |
| } |
| |
| static inline void dnrt_drop(struct dn_route *rt) |
| { |
| dst_release(&rt->dst); |
| call_rcu_bh(&rt->dst.rcu_head, dst_rcu_free); |
| } |
| |
| static void dn_dst_check_expire(unsigned long dummy) |
| { |
| int i; |
| struct dn_route *rt; |
| struct dn_route __rcu **rtp; |
| unsigned long now = jiffies; |
| unsigned long expire = 120 * HZ; |
| |
| for (i = 0; i <= dn_rt_hash_mask; i++) { |
| rtp = &dn_rt_hash_table[i].chain; |
| |
| spin_lock(&dn_rt_hash_table[i].lock); |
| while ((rt = rcu_dereference_protected(*rtp, |
| lockdep_is_held(&dn_rt_hash_table[i].lock))) != NULL) { |
| if (atomic_read(&rt->dst.__refcnt) || |
| (now - rt->dst.lastuse) < expire) { |
| rtp = &rt->dst.dn_next; |
| continue; |
| } |
| *rtp = rt->dst.dn_next; |
| rt->dst.dn_next = NULL; |
| dnrt_free(rt); |
| } |
| spin_unlock(&dn_rt_hash_table[i].lock); |
| |
| if ((jiffies - now) > 0) |
| break; |
| } |
| |
| mod_timer(&dn_route_timer, now + decnet_dst_gc_interval * HZ); |
| } |
| |
| static int dn_dst_gc(struct dst_ops *ops) |
| { |
| struct dn_route *rt; |
| struct dn_route __rcu **rtp; |
| int i; |
| unsigned long now = jiffies; |
| unsigned long expire = 10 * HZ; |
| |
| for (i = 0; i <= dn_rt_hash_mask; i++) { |
| |
| spin_lock_bh(&dn_rt_hash_table[i].lock); |
| rtp = &dn_rt_hash_table[i].chain; |
| |
| while ((rt = rcu_dereference_protected(*rtp, |
| lockdep_is_held(&dn_rt_hash_table[i].lock))) != NULL) { |
| if (atomic_read(&rt->dst.__refcnt) || |
| (now - rt->dst.lastuse) < expire) { |
| rtp = &rt->dst.dn_next; |
| continue; |
| } |
| *rtp = rt->dst.dn_next; |
| rt->dst.dn_next = NULL; |
| dnrt_drop(rt); |
| break; |
| } |
| spin_unlock_bh(&dn_rt_hash_table[i].lock); |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * The decnet standards don't impose a particular minimum mtu, what they |
| * do insist on is that the routing layer accepts a datagram of at least |
| * 230 bytes long. Here we have to subtract the routing header length from |
| * 230 to get the minimum acceptable mtu. If there is no neighbour, then we |
| * assume the worst and use a long header size. |
| * |
| * We update both the mtu and the advertised mss (i.e. the segment size we |
| * advertise to the other end). |
| */ |
| static void dn_dst_update_pmtu(struct dst_entry *dst, u32 mtu) |
| { |
| struct dn_route *rt = (struct dn_route *) dst; |
| struct neighbour *n = rt->n; |
| u32 min_mtu = 230; |
| struct dn_dev *dn; |
| |
| dn = n ? rcu_dereference_raw(n->dev->dn_ptr) : NULL; |
| |
| if (dn && dn->use_long == 0) |
| min_mtu -= 6; |
| else |
| min_mtu -= 21; |
| |
| if (dst_metric(dst, RTAX_MTU) > mtu && mtu >= min_mtu) { |
| if (!(dst_metric_locked(dst, RTAX_MTU))) { |
| dst_metric_set(dst, RTAX_MTU, mtu); |
| dst_set_expires(dst, dn_rt_mtu_expires); |
| } |
| if (!(dst_metric_locked(dst, RTAX_ADVMSS))) { |
| u32 mss = mtu - DN_MAX_NSP_DATA_HEADER; |
| u32 existing_mss = dst_metric_raw(dst, RTAX_ADVMSS); |
| if (!existing_mss || existing_mss > mss) |
| dst_metric_set(dst, RTAX_ADVMSS, mss); |
| } |
| } |
| } |
| |
| static void dn_dst_redirect(struct dst_entry *dst, struct sk_buff *skb) |
| { |
| } |
| |
| /* |
| * When a route has been marked obsolete. (e.g. routing cache flush) |
| */ |
| static struct dst_entry *dn_dst_check(struct dst_entry *dst, __u32 cookie) |
| { |
| return NULL; |
| } |
| |
| static struct dst_entry *dn_dst_negative_advice(struct dst_entry *dst) |
| { |
| dst_release(dst); |
| return NULL; |
| } |
| |
| static void dn_dst_link_failure(struct sk_buff *skb) |
| { |
| } |
| |
| static inline int compare_keys(struct flowidn *fl1, struct flowidn *fl2) |
| { |
| return ((fl1->daddr ^ fl2->daddr) | |
| (fl1->saddr ^ fl2->saddr) | |
| (fl1->flowidn_mark ^ fl2->flowidn_mark) | |
| (fl1->flowidn_scope ^ fl2->flowidn_scope) | |
| (fl1->flowidn_oif ^ fl2->flowidn_oif) | |
| (fl1->flowidn_iif ^ fl2->flowidn_iif)) == 0; |
| } |
| |
| static int dn_insert_route(struct dn_route *rt, unsigned int hash, struct dn_route **rp) |
| { |
| struct dn_route *rth; |
| struct dn_route __rcu **rthp; |
| unsigned long now = jiffies; |
| |
| rthp = &dn_rt_hash_table[hash].chain; |
| |
| spin_lock_bh(&dn_rt_hash_table[hash].lock); |
| while ((rth = rcu_dereference_protected(*rthp, |
| lockdep_is_held(&dn_rt_hash_table[hash].lock))) != NULL) { |
| if (compare_keys(&rth->fld, &rt->fld)) { |
| /* Put it first */ |
| *rthp = rth->dst.dn_next; |
| rcu_assign_pointer(rth->dst.dn_next, |
| dn_rt_hash_table[hash].chain); |
| rcu_assign_pointer(dn_rt_hash_table[hash].chain, rth); |
| |
| dst_use(&rth->dst, now); |
| spin_unlock_bh(&dn_rt_hash_table[hash].lock); |
| |
| dnrt_drop(rt); |
| *rp = rth; |
| return 0; |
| } |
| rthp = &rth->dst.dn_next; |
| } |
| |
| rcu_assign_pointer(rt->dst.dn_next, dn_rt_hash_table[hash].chain); |
| rcu_assign_pointer(dn_rt_hash_table[hash].chain, rt); |
| |
| dst_use(&rt->dst, now); |
| spin_unlock_bh(&dn_rt_hash_table[hash].lock); |
| *rp = rt; |
| return 0; |
| } |
| |
| static void dn_run_flush(unsigned long dummy) |
| { |
| int i; |
| struct dn_route *rt, *next; |
| |
| for (i = 0; i < dn_rt_hash_mask; i++) { |
| spin_lock_bh(&dn_rt_hash_table[i].lock); |
| |
| if ((rt = xchg((struct dn_route **)&dn_rt_hash_table[i].chain, NULL)) == NULL) |
| goto nothing_to_declare; |
| |
| for(; rt; rt = next) { |
| next = rcu_dereference_raw(rt->dst.dn_next); |
| RCU_INIT_POINTER(rt->dst.dn_next, NULL); |
| dst_free((struct dst_entry *)rt); |
| } |
| |
| nothing_to_declare: |
| spin_unlock_bh(&dn_rt_hash_table[i].lock); |
| } |
| } |
| |
| static DEFINE_SPINLOCK(dn_rt_flush_lock); |
| |
| void dn_rt_cache_flush(int delay) |
| { |
| unsigned long now = jiffies; |
| int user_mode = !in_interrupt(); |
| |
| if (delay < 0) |
| delay = dn_rt_min_delay; |
| |
| spin_lock_bh(&dn_rt_flush_lock); |
| |
| if (del_timer(&dn_rt_flush_timer) && delay > 0 && dn_rt_deadline) { |
| long tmo = (long)(dn_rt_deadline - now); |
| |
| if (user_mode && tmo < dn_rt_max_delay - dn_rt_min_delay) |
| tmo = 0; |
| |
| if (delay > tmo) |
| delay = tmo; |
| } |
| |
| if (delay <= 0) { |
| spin_unlock_bh(&dn_rt_flush_lock); |
| dn_run_flush(0); |
| return; |
| } |
| |
| if (dn_rt_deadline == 0) |
| dn_rt_deadline = now + dn_rt_max_delay; |
| |
| dn_rt_flush_timer.expires = now + delay; |
| add_timer(&dn_rt_flush_timer); |
| spin_unlock_bh(&dn_rt_flush_lock); |
| } |
| |
| /** |
| * dn_return_short - Return a short packet to its sender |
| * @skb: The packet to return |
| * |
| */ |
| static int dn_return_short(struct sk_buff *skb) |
| { |
| struct dn_skb_cb *cb; |
| unsigned char *ptr; |
| __le16 *src; |
| __le16 *dst; |
| |
| /* Add back headers */ |
| skb_push(skb, skb->data - skb_network_header(skb)); |
| |
| if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL) |
| return NET_RX_DROP; |
| |
| cb = DN_SKB_CB(skb); |
| /* Skip packet length and point to flags */ |
| ptr = skb->data + 2; |
| *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS; |
| |
| dst = (__le16 *)ptr; |
| ptr += 2; |
| src = (__le16 *)ptr; |
| ptr += 2; |
| *ptr = 0; /* Zero hop count */ |
| |
| swap(*src, *dst); |
| |
| skb->pkt_type = PACKET_OUTGOING; |
| dn_rt_finish_output(skb, NULL, NULL); |
| return NET_RX_SUCCESS; |
| } |
| |
| /** |
| * dn_return_long - Return a long packet to its sender |
| * @skb: The long format packet to return |
| * |
| */ |
| static int dn_return_long(struct sk_buff *skb) |
| { |
| struct dn_skb_cb *cb; |
| unsigned char *ptr; |
| unsigned char *src_addr, *dst_addr; |
| unsigned char tmp[ETH_ALEN]; |
| |
| /* Add back all headers */ |
| skb_push(skb, skb->data - skb_network_header(skb)); |
| |
| if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL) |
| return NET_RX_DROP; |
| |
| cb = DN_SKB_CB(skb); |
| /* Ignore packet length and point to flags */ |
| ptr = skb->data + 2; |
| |
| /* Skip padding */ |
| if (*ptr & DN_RT_F_PF) { |
| char padlen = (*ptr & ~DN_RT_F_PF); |
| ptr += padlen; |
| } |
| |
| *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS; |
| ptr += 2; |
| dst_addr = ptr; |
| ptr += 8; |
| src_addr = ptr; |
| ptr += 6; |
| *ptr = 0; /* Zero hop count */ |
| |
| /* Swap source and destination */ |
| memcpy(tmp, src_addr, ETH_ALEN); |
| memcpy(src_addr, dst_addr, ETH_ALEN); |
| memcpy(dst_addr, tmp, ETH_ALEN); |
| |
| skb->pkt_type = PACKET_OUTGOING; |
| dn_rt_finish_output(skb, dst_addr, src_addr); |
| return NET_RX_SUCCESS; |
| } |
| |
| /** |
| * dn_route_rx_packet - Try and find a route for an incoming packet |
| * @skb: The packet to find a route for |
| * |
| * Returns: result of input function if route is found, error code otherwise |
| */ |
| static int dn_route_rx_packet(struct sk_buff *skb) |
| { |
| struct dn_skb_cb *cb; |
| int err; |
| |
| if ((err = dn_route_input(skb)) == 0) |
| return dst_input(skb); |
| |
| cb = DN_SKB_CB(skb); |
| if (decnet_debug_level & 4) { |
| char *devname = skb->dev ? skb->dev->name : "???"; |
| |
| printk(KERN_DEBUG |
| "DECnet: dn_route_rx_packet: rt_flags=0x%02x dev=%s len=%d src=0x%04hx dst=0x%04hx err=%d type=%d\n", |
| (int)cb->rt_flags, devname, skb->len, |
| le16_to_cpu(cb->src), le16_to_cpu(cb->dst), |
| err, skb->pkt_type); |
| } |
| |
| if ((skb->pkt_type == PACKET_HOST) && (cb->rt_flags & DN_RT_F_RQR)) { |
| switch (cb->rt_flags & DN_RT_PKT_MSK) { |
| case DN_RT_PKT_SHORT: |
| return dn_return_short(skb); |
| case DN_RT_PKT_LONG: |
| return dn_return_long(skb); |
| } |
| } |
| |
| kfree_skb(skb); |
| return NET_RX_DROP; |
| } |
| |
| static int dn_route_rx_long(struct sk_buff *skb) |
| { |
| struct dn_skb_cb *cb = DN_SKB_CB(skb); |
| unsigned char *ptr = skb->data; |
| |
| if (!pskb_may_pull(skb, 21)) /* 20 for long header, 1 for shortest nsp */ |
| goto drop_it; |
| |
| skb_pull(skb, 20); |
| skb_reset_transport_header(skb); |
| |
| /* Destination info */ |
| ptr += 2; |
| cb->dst = dn_eth2dn(ptr); |
| if (memcmp(ptr, dn_hiord_addr, 4) != 0) |
| goto drop_it; |
| ptr += 6; |
| |
| |
| /* Source info */ |
| ptr += 2; |
| cb->src = dn_eth2dn(ptr); |
| if (memcmp(ptr, dn_hiord_addr, 4) != 0) |
| goto drop_it; |
| ptr += 6; |
| /* Other junk */ |
| ptr++; |
| cb->hops = *ptr++; /* Visit Count */ |
| |
| return NF_HOOK(NFPROTO_DECNET, NF_DN_PRE_ROUTING, skb, skb->dev, NULL, |
| dn_route_rx_packet); |
| |
| drop_it: |
| kfree_skb(skb); |
| return NET_RX_DROP; |
| } |
| |
| |
| |
| static int dn_route_rx_short(struct sk_buff *skb) |
| { |
| struct dn_skb_cb *cb = DN_SKB_CB(skb); |
| unsigned char *ptr = skb->data; |
| |
| if (!pskb_may_pull(skb, 6)) /* 5 for short header + 1 for shortest nsp */ |
| goto drop_it; |
| |
| skb_pull(skb, 5); |
| skb_reset_transport_header(skb); |
| |
| cb->dst = *(__le16 *)ptr; |
| ptr += 2; |
| cb->src = *(__le16 *)ptr; |
| ptr += 2; |
| cb->hops = *ptr & 0x3f; |
| |
| return NF_HOOK(NFPROTO_DECNET, NF_DN_PRE_ROUTING, skb, skb->dev, NULL, |
| dn_route_rx_packet); |
| |
| drop_it: |
| kfree_skb(skb); |
| return NET_RX_DROP; |
| } |
| |
| static int dn_route_discard(struct sk_buff *skb) |
| { |
| /* |
| * I know we drop the packet here, but thats considered success in |
| * this case |
| */ |
| kfree_skb(skb); |
| return NET_RX_SUCCESS; |
| } |
| |
| static int dn_route_ptp_hello(struct sk_buff *skb) |
| { |
| dn_dev_hello(skb); |
| dn_neigh_pointopoint_hello(skb); |
| return NET_RX_SUCCESS; |
| } |
| |
| int dn_route_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
| { |
| struct dn_skb_cb *cb; |
| unsigned char flags = 0; |
| __u16 len = le16_to_cpu(*(__le16 *)skb->data); |
| struct dn_dev *dn = rcu_dereference(dev->dn_ptr); |
| unsigned char padlen = 0; |
| |
| if (!net_eq(dev_net(dev), &init_net)) |
| goto dump_it; |
| |
| if (dn == NULL) |
| goto dump_it; |
| |
| if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) |
| goto out; |
| |
| if (!pskb_may_pull(skb, 3)) |
| goto dump_it; |
| |
| skb_pull(skb, 2); |
| |
| if (len > skb->len) |
| goto dump_it; |
| |
| skb_trim(skb, len); |
| |
| flags = *skb->data; |
| |
| cb = DN_SKB_CB(skb); |
| cb->stamp = jiffies; |
| cb->iif = dev->ifindex; |
| |
| /* |
| * If we have padding, remove it. |
| */ |
| if (flags & DN_RT_F_PF) { |
| padlen = flags & ~DN_RT_F_PF; |
| if (!pskb_may_pull(skb, padlen + 1)) |
| goto dump_it; |
| skb_pull(skb, padlen); |
| flags = *skb->data; |
| } |
| |
| skb_reset_network_header(skb); |
| |
| /* |
| * Weed out future version DECnet |
| */ |
| if (flags & DN_RT_F_VER) |
| goto dump_it; |
| |
| cb->rt_flags = flags; |
| |
| if (decnet_debug_level & 1) |
| printk(KERN_DEBUG |
| "dn_route_rcv: got 0x%02x from %s [%d %d %d]\n", |
| (int)flags, (dev) ? dev->name : "???", len, skb->len, |
| padlen); |
| |
| if (flags & DN_RT_PKT_CNTL) { |
| if (unlikely(skb_linearize(skb))) |
| goto dump_it; |
| |
| switch (flags & DN_RT_CNTL_MSK) { |
| case DN_RT_PKT_INIT: |
| dn_dev_init_pkt(skb); |
| break; |
| case DN_RT_PKT_VERI: |
| dn_dev_veri_pkt(skb); |
| break; |
| } |
| |
| if (dn->parms.state != DN_DEV_S_RU) |
| goto dump_it; |
| |
| switch (flags & DN_RT_CNTL_MSK) { |
| case DN_RT_PKT_HELO: |
| return NF_HOOK(NFPROTO_DECNET, NF_DN_HELLO, |
| skb, skb->dev, NULL, |
| dn_route_ptp_hello); |
| |
| case DN_RT_PKT_L1RT: |
| case DN_RT_PKT_L2RT: |
| return NF_HOOK(NFPROTO_DECNET, NF_DN_ROUTE, |
| skb, skb->dev, NULL, |
| dn_route_discard); |
| case DN_RT_PKT_ERTH: |
| return NF_HOOK(NFPROTO_DECNET, NF_DN_HELLO, |
| skb, skb->dev, NULL, |
| dn_neigh_router_hello); |
| |
| case DN_RT_PKT_EEDH: |
| return NF_HOOK(NFPROTO_DECNET, NF_DN_HELLO, |
| skb, skb->dev, NULL, |
| dn_neigh_endnode_hello); |
| } |
| } else { |
| if (dn->parms.state != DN_DEV_S_RU) |
| goto dump_it; |
| |
| skb_pull(skb, 1); /* Pull flags */ |
| |
| switch (flags & DN_RT_PKT_MSK) { |
| case DN_RT_PKT_LONG: |
| return dn_route_rx_long(skb); |
| case DN_RT_PKT_SHORT: |
| return dn_route_rx_short(skb); |
| } |
| } |
| |
| dump_it: |
| kfree_skb(skb); |
| out: |
| return NET_RX_DROP; |
| } |
| |
| static int dn_to_neigh_output(struct sk_buff *skb) |
| { |
| struct dst_entry *dst = skb_dst(skb); |
| struct dn_route *rt = (struct dn_route *) dst; |
| struct neighbour *n = rt->n; |
| |
| return n->output(n, skb); |
| } |
| |
| static int dn_output(struct sk_buff *skb) |
| { |
| struct dst_entry *dst = skb_dst(skb); |
| struct dn_route *rt = (struct dn_route *)dst; |
| struct net_device *dev = dst->dev; |
| struct dn_skb_cb *cb = DN_SKB_CB(skb); |
| |
| int err = -EINVAL; |
| |
| if (rt->n == NULL) |
| goto error; |
| |
| skb->dev = dev; |
| |
| cb->src = rt->rt_saddr; |
| cb->dst = rt->rt_daddr; |
| |
| /* |
| * Always set the Intra-Ethernet bit on all outgoing packets |
| * originated on this node. Only valid flag from upper layers |
| * is return-to-sender-requested. Set hop count to 0 too. |
| */ |
| cb->rt_flags &= ~DN_RT_F_RQR; |
| cb->rt_flags |= DN_RT_F_IE; |
| cb->hops = 0; |
| |
| return NF_HOOK(NFPROTO_DECNET, NF_DN_LOCAL_OUT, skb, NULL, dev, |
| dn_to_neigh_output); |
| |
| error: |
| net_dbg_ratelimited("dn_output: This should not happen\n"); |
| |
| kfree_skb(skb); |
| |
| return err; |
| } |
| |
| static int dn_forward(struct sk_buff *skb) |
| { |
| struct dn_skb_cb *cb = DN_SKB_CB(skb); |
| struct dst_entry *dst = skb_dst(skb); |
| struct dn_dev *dn_db = rcu_dereference(dst->dev->dn_ptr); |
| struct dn_route *rt; |
| int header_len; |
| #ifdef CONFIG_NETFILTER |
| struct net_device *dev = skb->dev; |
| #endif |
| |
| if (skb->pkt_type != PACKET_HOST) |
| goto drop; |
| |
| /* Ensure that we have enough space for headers */ |
| rt = (struct dn_route *)skb_dst(skb); |
| header_len = dn_db->use_long ? 21 : 6; |
| if (skb_cow(skb, LL_RESERVED_SPACE(rt->dst.dev)+header_len)) |
| goto drop; |
| |
| /* |
| * Hop count exceeded. |
| */ |
| if (++cb->hops > 30) |
| goto drop; |
| |
| skb->dev = rt->dst.dev; |
| |
| /* |
| * If packet goes out same interface it came in on, then set |
| * the Intra-Ethernet bit. This has no effect for short |
| * packets, so we don't need to test for them here. |
| */ |
| cb->rt_flags &= ~DN_RT_F_IE; |
| if (rt->rt_flags & RTCF_DOREDIRECT) |
| cb->rt_flags |= DN_RT_F_IE; |
| |
| return NF_HOOK(NFPROTO_DECNET, NF_DN_FORWARD, skb, dev, skb->dev, |
| dn_to_neigh_output); |
| |
| drop: |
| kfree_skb(skb); |
| return NET_RX_DROP; |
| } |
| |
| /* |
| * Used to catch bugs. This should never normally get |
| * called. |
| */ |
| static int dn_rt_bug(struct sk_buff *skb) |
| { |
| struct dn_skb_cb *cb = DN_SKB_CB(skb); |
| |
| net_dbg_ratelimited("dn_rt_bug: skb from:%04x to:%04x\n", |
| le16_to_cpu(cb->src), le16_to_cpu(cb->dst)); |
| |
| kfree_skb(skb); |
| |
| return NET_RX_DROP; |
| } |
| |
| static unsigned int dn_dst_default_advmss(const struct dst_entry *dst) |
| { |
| return dn_mss_from_pmtu(dst->dev, dst_mtu(dst)); |
| } |
| |
| static unsigned int dn_dst_mtu(const struct dst_entry *dst) |
| { |
| unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
| |
| return mtu ? : dst->dev->mtu; |
| } |
| |
| static struct neighbour *dn_dst_neigh_lookup(const struct dst_entry *dst, |
| struct sk_buff *skb, |
| const void *daddr) |
| { |
| return __neigh_lookup_errno(&dn_neigh_table, daddr, dst->dev); |
| } |
| |
| static int dn_rt_set_next_hop(struct dn_route *rt, struct dn_fib_res *res) |
| { |
| struct dn_fib_info *fi = res->fi; |
| struct net_device *dev = rt->dst.dev; |
| unsigned int mss_metric; |
| struct neighbour *n; |
| |
| if (fi) { |
| if (DN_FIB_RES_GW(*res) && |
| DN_FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) |
| rt->rt_gateway = DN_FIB_RES_GW(*res); |
| dst_init_metrics(&rt->dst, fi->fib_metrics, true); |
| } |
| rt->rt_type = res->type; |
| |
| if (dev != NULL && rt->n == NULL) { |
| n = __neigh_lookup_errno(&dn_neigh_table, &rt->rt_gateway, dev); |
| if (IS_ERR(n)) |
| return PTR_ERR(n); |
| rt->n = n; |
| } |
| |
| if (dst_metric(&rt->dst, RTAX_MTU) > rt->dst.dev->mtu) |
| dst_metric_set(&rt->dst, RTAX_MTU, rt->dst.dev->mtu); |
| mss_metric = dst_metric_raw(&rt->dst, RTAX_ADVMSS); |
| if (mss_metric) { |
| unsigned int mss = dn_mss_from_pmtu(dev, dst_mtu(&rt->dst)); |
| if (mss_metric > mss) |
| dst_metric_set(&rt->dst, RTAX_ADVMSS, mss); |
| } |
| return 0; |
| } |
| |
| static inline int dn_match_addr(__le16 addr1, __le16 addr2) |
| { |
| __u16 tmp = le16_to_cpu(addr1) ^ le16_to_cpu(addr2); |
| int match = 16; |
| while(tmp) { |
| tmp >>= 1; |
| match--; |
| } |
| return match; |
| } |
| |
| static __le16 dnet_select_source(const struct net_device *dev, __le16 daddr, int scope) |
| { |
| __le16 saddr = 0; |
| struct dn_dev *dn_db; |
| struct dn_ifaddr *ifa; |
| int best_match = 0; |
| int ret; |
| |
| rcu_read_lock(); |
| dn_db = rcu_dereference(dev->dn_ptr); |
| for (ifa = rcu_dereference(dn_db->ifa_list); |
| ifa != NULL; |
| ifa = rcu_dereference(ifa->ifa_next)) { |
| if (ifa->ifa_scope > scope) |
| continue; |
| if (!daddr) { |
| saddr = ifa->ifa_local; |
| break; |
| } |
| ret = dn_match_addr(daddr, ifa->ifa_local); |
| if (ret > best_match) |
| saddr = ifa->ifa_local; |
| if (best_match == 0) |
| saddr = ifa->ifa_local; |
| } |
| rcu_read_unlock(); |
| |
| return saddr; |
| } |
| |
| static inline __le16 __dn_fib_res_prefsrc(struct dn_fib_res *res) |
| { |
| return dnet_select_source(DN_FIB_RES_DEV(*res), DN_FIB_RES_GW(*res), res->scope); |
| } |
| |
| static inline __le16 dn_fib_rules_map_destination(__le16 daddr, struct dn_fib_res *res) |
| { |
| __le16 mask = dnet_make_mask(res->prefixlen); |
| return (daddr&~mask)|res->fi->fib_nh->nh_gw; |
| } |
| |
| static int dn_route_output_slow(struct dst_entry **pprt, const struct flowidn *oldflp, int try_hard) |
| { |
| struct flowidn fld = { |
| .daddr = oldflp->daddr, |
| .saddr = oldflp->saddr, |
| .flowidn_scope = RT_SCOPE_UNIVERSE, |
| .flowidn_mark = oldflp->flowidn_mark, |
| .flowidn_iif = init_net.loopback_dev->ifindex, |
| .flowidn_oif = oldflp->flowidn_oif, |
| }; |
| struct dn_route *rt = NULL; |
| struct net_device *dev_out = NULL, *dev; |
| struct neighbour *neigh = NULL; |
| unsigned int hash; |
| unsigned int flags = 0; |
| struct dn_fib_res res = { .fi = NULL, .type = RTN_UNICAST }; |
| int err; |
| int free_res = 0; |
| __le16 gateway = 0; |
| |
| if (decnet_debug_level & 16) |
| printk(KERN_DEBUG |
| "dn_route_output_slow: dst=%04x src=%04x mark=%d" |
| " iif=%d oif=%d\n", le16_to_cpu(oldflp->daddr), |
| le16_to_cpu(oldflp->saddr), |
| oldflp->flowidn_mark, init_net.loopback_dev->ifindex, |
| oldflp->flowidn_oif); |
| |
| /* If we have an output interface, verify its a DECnet device */ |
| if (oldflp->flowidn_oif) { |
| dev_out = dev_get_by_index(&init_net, oldflp->flowidn_oif); |
| err = -ENODEV; |
| if (dev_out && dev_out->dn_ptr == NULL) { |
| dev_put(dev_out); |
| dev_out = NULL; |
| } |
| if (dev_out == NULL) |
| goto out; |
| } |
| |
| /* If we have a source address, verify that its a local address */ |
| if (oldflp->saddr) { |
| err = -EADDRNOTAVAIL; |
| |
| if (dev_out) { |
| if (dn_dev_islocal(dev_out, oldflp->saddr)) |
| goto source_ok; |
| dev_put(dev_out); |
| goto out; |
| } |
| rcu_read_lock(); |
| for_each_netdev_rcu(&init_net, dev) { |
| if (!dev->dn_ptr) |
| continue; |
| if (!dn_dev_islocal(dev, oldflp->saddr)) |
| continue; |
| if ((dev->flags & IFF_LOOPBACK) && |
| oldflp->daddr && |
| !dn_dev_islocal(dev, oldflp->daddr)) |
| continue; |
| |
| dev_out = dev; |
| break; |
| } |
| rcu_read_unlock(); |
| if (dev_out == NULL) |
| goto out; |
| dev_hold(dev_out); |
| source_ok: |
| ; |
| } |
| |
| /* No destination? Assume its local */ |
| if (!fld.daddr) { |
| fld.daddr = fld.saddr; |
| |
| err = -EADDRNOTAVAIL; |
| if (dev_out) |
| dev_put(dev_out); |
| dev_out = init_net.loopback_dev; |
| dev_hold(dev_out); |
| if (!fld.daddr) { |
| fld.daddr = |
| fld.saddr = dnet_select_source(dev_out, 0, |
| RT_SCOPE_HOST); |
| if (!fld.daddr) |
| goto out; |
| } |
| fld.flowidn_oif = init_net.loopback_dev->ifindex; |
| res.type = RTN_LOCAL; |
| goto make_route; |
| } |
| |
| if (decnet_debug_level & 16) |
| printk(KERN_DEBUG |
| "dn_route_output_slow: initial checks complete." |
| " dst=%o4x src=%04x oif=%d try_hard=%d\n", |
| le16_to_cpu(fld.daddr), le16_to_cpu(fld.saddr), |
| fld.flowidn_oif, try_hard); |
| |
| /* |
| * N.B. If the kernel is compiled without router support then |
| * dn_fib_lookup() will evaluate to non-zero so this if () block |
| * will always be executed. |
| */ |
| err = -ESRCH; |
| if (try_hard || (err = dn_fib_lookup(&fld, &res)) != 0) { |
| struct dn_dev *dn_db; |
| if (err != -ESRCH) |
| goto out; |
| /* |
| * Here the fallback is basically the standard algorithm for |
| * routing in endnodes which is described in the DECnet routing |
| * docs |
| * |
| * If we are not trying hard, look in neighbour cache. |
| * The result is tested to ensure that if a specific output |
| * device/source address was requested, then we honour that |
| * here |
| */ |
| if (!try_hard) { |
| neigh = neigh_lookup_nodev(&dn_neigh_table, &init_net, &fld.daddr); |
| if (neigh) { |
| if ((oldflp->flowidn_oif && |
| (neigh->dev->ifindex != oldflp->flowidn_oif)) || |
| (oldflp->saddr && |
| (!dn_dev_islocal(neigh->dev, |
| oldflp->saddr)))) { |
| neigh_release(neigh); |
| neigh = NULL; |
| } else { |
| if (dev_out) |
| dev_put(dev_out); |
| if (dn_dev_islocal(neigh->dev, fld.daddr)) { |
| dev_out = init_net.loopback_dev; |
| res.type = RTN_LOCAL; |
| } else { |
| dev_out = neigh->dev; |
| } |
| dev_hold(dev_out); |
| goto select_source; |
| } |
| } |
| } |
| |
| /* Not there? Perhaps its a local address */ |
| if (dev_out == NULL) |
| dev_out = dn_dev_get_default(); |
| err = -ENODEV; |
| if (dev_out == NULL) |
| goto out; |
| dn_db = rcu_dereference_raw(dev_out->dn_ptr); |
| /* Possible improvement - check all devices for local addr */ |
| if (dn_dev_islocal(dev_out, fld.daddr)) { |
| dev_put(dev_out); |
| dev_out = init_net.loopback_dev; |
| dev_hold(dev_out); |
| res.type = RTN_LOCAL; |
| goto select_source; |
| } |
| /* Not local either.... try sending it to the default router */ |
| neigh = neigh_clone(dn_db->router); |
| BUG_ON(neigh && neigh->dev != dev_out); |
| |
| /* Ok then, we assume its directly connected and move on */ |
| select_source: |
| if (neigh) |
| gateway = ((struct dn_neigh *)neigh)->addr; |
| if (gateway == 0) |
| gateway = fld.daddr; |
| if (fld.saddr == 0) { |
| fld.saddr = dnet_select_source(dev_out, gateway, |
| res.type == RTN_LOCAL ? |
| RT_SCOPE_HOST : |
| RT_SCOPE_LINK); |
| if (fld.saddr == 0 && res.type != RTN_LOCAL) |
| goto e_addr; |
| } |
| fld.flowidn_oif = dev_out->ifindex; |
| goto make_route; |
| } |
| free_res = 1; |
| |
| if (res.type == RTN_NAT) |
| goto e_inval; |
| |
| if (res.type == RTN_LOCAL) { |
| if (!fld.saddr) |
| fld.saddr = fld.daddr; |
| if (dev_out) |
| dev_put(dev_out); |
| dev_out = init_net.loopback_dev; |
| dev_hold(dev_out); |
| fld.flowidn_oif = dev_out->ifindex; |
| if (res.fi) |
| dn_fib_info_put(res.fi); |
| res.fi = NULL; |
| goto make_route; |
| } |
| |
| if (res.fi->fib_nhs > 1 && fld.flowidn_oif == 0) |
| dn_fib_select_multipath(&fld, &res); |
| |
| /* |
| * We could add some logic to deal with default routes here and |
| * get rid of some of the special casing above. |
| */ |
| |
| if (!fld.saddr) |
| fld.saddr = DN_FIB_RES_PREFSRC(res); |
| |
| if (dev_out) |
| dev_put(dev_out); |
| dev_out = DN_FIB_RES_DEV(res); |
| dev_hold(dev_out); |
| fld.flowidn_oif = dev_out->ifindex; |
| gateway = DN_FIB_RES_GW(res); |
| |
| make_route: |
| if (dev_out->flags & IFF_LOOPBACK) |
| flags |= RTCF_LOCAL; |
| |
| rt = dst_alloc(&dn_dst_ops, dev_out, 1, 0, DST_HOST); |
| if (rt == NULL) |
| goto e_nobufs; |
| |
| memset(&rt->fld, 0, sizeof(rt->fld)); |
| rt->fld.saddr = oldflp->saddr; |
| rt->fld.daddr = oldflp->daddr; |
| rt->fld.flowidn_oif = oldflp->flowidn_oif; |
| rt->fld.flowidn_iif = 0; |
| rt->fld.flowidn_mark = oldflp->flowidn_mark; |
| |
| rt->rt_saddr = fld.saddr; |
| rt->rt_daddr = fld.daddr; |
| rt->rt_gateway = gateway ? gateway : fld.daddr; |
| rt->rt_local_src = fld.saddr; |
| |
| rt->rt_dst_map = fld.daddr; |
| rt->rt_src_map = fld.saddr; |
| |
| rt->n = neigh; |
| neigh = NULL; |
| |
| rt->dst.lastuse = jiffies; |
| rt->dst.output = dn_output; |
| rt->dst.input = dn_rt_bug; |
| rt->rt_flags = flags; |
| if (flags & RTCF_LOCAL) |
| rt->dst.input = dn_nsp_rx; |
| |
| err = dn_rt_set_next_hop(rt, &res); |
| if (err) |
| goto e_neighbour; |
| |
| hash = dn_hash(rt->fld.saddr, rt->fld.daddr); |
| dn_insert_route(rt, hash, (struct dn_route **)pprt); |
| |
| done: |
| if (neigh) |
| neigh_release(neigh); |
| if (free_res) |
| dn_fib_res_put(&res); |
| if (dev_out) |
| dev_put(dev_out); |
| out: |
| return err; |
| |
| e_addr: |
| err = -EADDRNOTAVAIL; |
| goto done; |
| e_inval: |
| err = -EINVAL; |
| goto done; |
| e_nobufs: |
| err = -ENOBUFS; |
| goto done; |
| e_neighbour: |
| dst_free(&rt->dst); |
| goto e_nobufs; |
| } |
| |
| |
| /* |
| * N.B. The flags may be moved into the flowi at some future stage. |
| */ |
| static int __dn_route_output_key(struct dst_entry **pprt, const struct flowidn *flp, int flags) |
| { |
| unsigned int hash = dn_hash(flp->saddr, flp->daddr); |
| struct dn_route *rt = NULL; |
| |
| if (!(flags & MSG_TRYHARD)) { |
| rcu_read_lock_bh(); |
| for (rt = rcu_dereference_bh(dn_rt_hash_table[hash].chain); rt; |
| rt = rcu_dereference_bh(rt->dst.dn_next)) { |
| if ((flp->daddr == rt->fld.daddr) && |
| (flp->saddr == rt->fld.saddr) && |
| (flp->flowidn_mark == rt->fld.flowidn_mark) && |
| dn_is_output_route(rt) && |
| (rt->fld.flowidn_oif == flp->flowidn_oif)) { |
| dst_use(&rt->dst, jiffies); |
| rcu_read_unlock_bh(); |
| *pprt = &rt->dst; |
| return 0; |
| } |
| } |
| rcu_read_unlock_bh(); |
| } |
| |
| return dn_route_output_slow(pprt, flp, flags); |
| } |
| |
| static int dn_route_output_key(struct dst_entry **pprt, struct flowidn *flp, int flags) |
| { |
| int err; |
| |
| err = __dn_route_output_key(pprt, flp, flags); |
| if (err == 0 && flp->flowidn_proto) { |
| *pprt = xfrm_lookup(&init_net, *pprt, |
| flowidn_to_flowi(flp), NULL, 0); |
| if (IS_ERR(*pprt)) { |
| err = PTR_ERR(*pprt); |
| *pprt = NULL; |
| } |
| } |
| return err; |
| } |
| |
| int dn_route_output_sock(struct dst_entry **pprt, struct flowidn *fl, struct sock *sk, int flags) |
| { |
| int err; |
| |
| err = __dn_route_output_key(pprt, fl, flags & MSG_TRYHARD); |
| if (err == 0 && fl->flowidn_proto) { |
| if (!(flags & MSG_DONTWAIT)) |
| fl->flowidn_flags |= FLOWI_FLAG_CAN_SLEEP; |
| *pprt = xfrm_lookup(&init_net, *pprt, |
| flowidn_to_flowi(fl), sk, 0); |
| if (IS_ERR(*pprt)) { |
| err = PTR_ERR(*pprt); |
| *pprt = NULL; |
| } |
| } |
| return err; |
| } |
| |
| static int dn_route_input_slow(struct sk_buff *skb) |
| { |
| struct dn_route *rt = NULL; |
| struct dn_skb_cb *cb = DN_SKB_CB(skb); |
| struct net_device *in_dev = skb->dev; |
| struct net_device *out_dev = NULL; |
| struct dn_dev *dn_db; |
| struct neighbour *neigh = NULL; |
| unsigned int hash; |
| int flags = 0; |
| __le16 gateway = 0; |
| __le16 local_src = 0; |
| struct flowidn fld = { |
| .daddr = cb->dst, |
| .saddr = cb->src, |
| .flowidn_scope = RT_SCOPE_UNIVERSE, |
| .flowidn_mark = skb->mark, |
| .flowidn_iif = skb->dev->ifindex, |
| }; |
| struct dn_fib_res res = { .fi = NULL, .type = RTN_UNREACHABLE }; |
| int err = -EINVAL; |
| int free_res = 0; |
| |
| dev_hold(in_dev); |
| |
| if ((dn_db = rcu_dereference(in_dev->dn_ptr)) == NULL) |
| goto out; |
| |
| /* Zero source addresses are not allowed */ |
| if (fld.saddr == 0) |
| goto out; |
| |
| /* |
| * In this case we've just received a packet from a source |
| * outside ourselves pretending to come from us. We don't |
| * allow it any further to prevent routing loops, spoofing and |
| * other nasties. Loopback packets already have the dst attached |
| * so this only affects packets which have originated elsewhere. |
| */ |
| err = -ENOTUNIQ; |
| if (dn_dev_islocal(in_dev, cb->src)) |
| goto out; |
| |
| err = dn_fib_lookup(&fld, &res); |
| if (err) { |
| if (err != -ESRCH) |
| goto out; |
| /* |
| * Is the destination us ? |
| */ |
| if (!dn_dev_islocal(in_dev, cb->dst)) |
| goto e_inval; |
| |
| res.type = RTN_LOCAL; |
| } else { |
| __le16 src_map = fld.saddr; |
| free_res = 1; |
| |
| out_dev = DN_FIB_RES_DEV(res); |
| if (out_dev == NULL) { |
| net_crit_ratelimited("Bug in dn_route_input_slow() No output device\n"); |
| goto e_inval; |
| } |
| dev_hold(out_dev); |
| |
| if (res.r) |
| src_map = fld.saddr; /* no NAT support for now */ |
| |
| gateway = DN_FIB_RES_GW(res); |
| if (res.type == RTN_NAT) { |
| fld.daddr = dn_fib_rules_map_destination(fld.daddr, &res); |
| dn_fib_res_put(&res); |
| free_res = 0; |
| if (dn_fib_lookup(&fld, &res)) |
| goto e_inval; |
| free_res = 1; |
| if (res.type != RTN_UNICAST) |
| goto e_inval; |
| flags |= RTCF_DNAT; |
| gateway = fld.daddr; |
| } |
| fld.saddr = src_map; |
| } |
| |
| switch(res.type) { |
| case RTN_UNICAST: |
| /* |
| * Forwarding check here, we only check for forwarding |
| * being turned off, if you want to only forward intra |
| * area, its up to you to set the routing tables up |
| * correctly. |
| */ |
| if (dn_db->parms.forwarding == 0) |
| goto e_inval; |
| |
| if (res.fi->fib_nhs > 1 && fld.flowidn_oif == 0) |
| dn_fib_select_multipath(&fld, &res); |
| |
| /* |
| * Check for out_dev == in_dev. We use the RTCF_DOREDIRECT |
| * flag as a hint to set the intra-ethernet bit when |
| * forwarding. If we've got NAT in operation, we don't do |
| * this optimisation. |
| */ |
| if (out_dev == in_dev && !(flags & RTCF_NAT)) |
| flags |= RTCF_DOREDIRECT; |
| |
| local_src = DN_FIB_RES_PREFSRC(res); |
| |
| case RTN_BLACKHOLE: |
| case RTN_UNREACHABLE: |
| break; |
| case RTN_LOCAL: |
| flags |= RTCF_LOCAL; |
| fld.saddr = cb->dst; |
| fld.daddr = cb->src; |
| |
| /* Routing tables gave us a gateway */ |
| if (gateway) |
| goto make_route; |
| |
| /* Packet was intra-ethernet, so we know its on-link */ |
| if (cb->rt_flags & DN_RT_F_IE) { |
| gateway = cb->src; |
| flags |= RTCF_DIRECTSRC; |
| goto make_route; |
| } |
| |
| /* Use the default router if there is one */ |
| neigh = neigh_clone(dn_db->router); |
| if (neigh) { |
| gateway = ((struct dn_neigh *)neigh)->addr; |
| goto make_route; |
| } |
| |
| /* Close eyes and pray */ |
| gateway = cb->src; |
| flags |= RTCF_DIRECTSRC; |
| goto make_route; |
| default: |
| goto e_inval; |
| } |
| |
| make_route: |
| rt = dst_alloc(&dn_dst_ops, out_dev, 0, 0, DST_HOST); |
| if (rt == NULL) |
| goto e_nobufs; |
| |
| memset(&rt->fld, 0, sizeof(rt->fld)); |
| rt->rt_saddr = fld.saddr; |
| rt->rt_daddr = fld.daddr; |
| rt->rt_gateway = fld.daddr; |
| if (gateway) |
| rt->rt_gateway = gateway; |
| rt->rt_local_src = local_src ? local_src : rt->rt_saddr; |
| |
| rt->rt_dst_map = fld.daddr; |
| rt->rt_src_map = fld.saddr; |
| |
| rt->fld.saddr = cb->src; |
| rt->fld.daddr = cb->dst; |
| rt->fld.flowidn_oif = 0; |
| rt->fld.flowidn_iif = in_dev->ifindex; |
| rt->fld.flowidn_mark = fld.flowidn_mark; |
| |
| rt->n = neigh; |
| rt->dst.lastuse = jiffies; |
| rt->dst.output = dn_rt_bug; |
| switch (res.type) { |
| case RTN_UNICAST: |
| rt->dst.input = dn_forward; |
| break; |
| case RTN_LOCAL: |
| rt->dst.output = dn_output; |
| rt->dst.input = dn_nsp_rx; |
| rt->dst.dev = in_dev; |
| flags |= RTCF_LOCAL; |
| break; |
| default: |
| case RTN_UNREACHABLE: |
| case RTN_BLACKHOLE: |
| rt->dst.input = dst_discard; |
| } |
| rt->rt_flags = flags; |
| |
| err = dn_rt_set_next_hop(rt, &res); |
| if (err) |
| goto e_neighbour; |
| |
| hash = dn_hash(rt->fld.saddr, rt->fld.daddr); |
| dn_insert_route(rt, hash, &rt); |
| skb_dst_set(skb, &rt->dst); |
| |
| done: |
| if (neigh) |
| neigh_release(neigh); |
| if (free_res) |
| dn_fib_res_put(&res); |
| dev_put(in_dev); |
| if (out_dev) |
| dev_put(out_dev); |
| out: |
| return err; |
| |
| e_inval: |
| err = -EINVAL; |
| goto done; |
| |
| e_nobufs: |
| err = -ENOBUFS; |
| goto done; |
| |
| e_neighbour: |
| dst_free(&rt->dst); |
| goto done; |
| } |
| |
| static int dn_route_input(struct sk_buff *skb) |
| { |
| struct dn_route *rt; |
| struct dn_skb_cb *cb = DN_SKB_CB(skb); |
| unsigned int hash = dn_hash(cb->src, cb->dst); |
| |
| if (skb_dst(skb)) |
| return 0; |
| |
| rcu_read_lock(); |
| for(rt = rcu_dereference(dn_rt_hash_table[hash].chain); rt != NULL; |
| rt = rcu_dereference(rt->dst.dn_next)) { |
| if ((rt->fld.saddr == cb->src) && |
| (rt->fld.daddr == cb->dst) && |
| (rt->fld.flowidn_oif == 0) && |
| (rt->fld.flowidn_mark == skb->mark) && |
| (rt->fld.flowidn_iif == cb->iif)) { |
| dst_use(&rt->dst, jiffies); |
| rcu_read_unlock(); |
| skb_dst_set(skb, (struct dst_entry *)rt); |
| return 0; |
| } |
| } |
| rcu_read_unlock(); |
| |
| return dn_route_input_slow(skb); |
| } |
| |
| static int dn_rt_fill_info(struct sk_buff *skb, u32 pid, u32 seq, |
| int event, int nowait, unsigned int flags) |
| { |
| struct dn_route *rt = (struct dn_route *)skb_dst(skb); |
| struct rtmsg *r; |
| struct nlmsghdr *nlh; |
| long expires; |
| |
| nlh = nlmsg_put(skb, pid, seq, event, sizeof(*r), flags); |
| if (!nlh) |
| return -EMSGSIZE; |
| |
| r = nlmsg_data(nlh); |
| r->rtm_family = AF_DECnet; |
| r->rtm_dst_len = 16; |
| r->rtm_src_len = 0; |
| r->rtm_tos = 0; |
| r->rtm_table = RT_TABLE_MAIN; |
| r->rtm_type = rt->rt_type; |
| r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED; |
| r->rtm_scope = RT_SCOPE_UNIVERSE; |
| r->rtm_protocol = RTPROT_UNSPEC; |
| |
| if (rt->rt_flags & RTCF_NOTIFY) |
| r->rtm_flags |= RTM_F_NOTIFY; |
| |
| if (nla_put_u32(skb, RTA_TABLE, RT_TABLE_MAIN) < 0 || |
| nla_put_le16(skb, RTA_DST, rt->rt_daddr) < 0) |
| goto errout; |
| |
| if (rt->fld.saddr) { |
| r->rtm_src_len = 16; |
| if (nla_put_le16(skb, RTA_SRC, rt->fld.saddr) < 0) |
| goto errout; |
| } |
| if (rt->dst.dev && |
| nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex) < 0) |
| goto errout; |
| |
| /* |
| * Note to self - change this if input routes reverse direction when |
| * they deal only with inputs and not with replies like they do |
| * currently. |
| */ |
| if (nla_put_le16(skb, RTA_PREFSRC, rt->rt_local_src) < 0) |
| goto errout; |
| |
| if (rt->rt_daddr != rt->rt_gateway && |
| nla_put_le16(skb, RTA_GATEWAY, rt->rt_gateway) < 0) |
| goto errout; |
| |
| if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0) |
| goto errout; |
| |
| expires = rt->dst.expires ? rt->dst.expires - jiffies : 0; |
| if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, |
| rt->dst.error) < 0) |
| goto errout; |
| |
| if (dn_is_input_route(rt) && |
| nla_put_u32(skb, RTA_IIF, rt->fld.flowidn_iif) < 0) |
| goto errout; |
| |
| return nlmsg_end(skb, nlh); |
| |
| errout: |
| nlmsg_cancel(skb, nlh); |
| return -EMSGSIZE; |
| } |
| |
| /* |
| * This is called by both endnodes and routers now. |
| */ |
| static int dn_cache_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, void *arg) |
| { |
| struct net *net = sock_net(in_skb->sk); |
| struct rtattr **rta = arg; |
| struct rtmsg *rtm = nlmsg_data(nlh); |
| struct dn_route *rt = NULL; |
| struct dn_skb_cb *cb; |
| int err; |
| struct sk_buff *skb; |
| struct flowidn fld; |
| |
| if (!net_eq(net, &init_net)) |
| return -EINVAL; |
| |
| memset(&fld, 0, sizeof(fld)); |
| fld.flowidn_proto = DNPROTO_NSP; |
| |
| skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
| if (skb == NULL) |
| return -ENOBUFS; |
| skb_reset_mac_header(skb); |
| cb = DN_SKB_CB(skb); |
| |
| if (rta[RTA_SRC-1]) |
| memcpy(&fld.saddr, RTA_DATA(rta[RTA_SRC-1]), 2); |
| if (rta[RTA_DST-1]) |
| memcpy(&fld.daddr, RTA_DATA(rta[RTA_DST-1]), 2); |
| if (rta[RTA_IIF-1]) |
| memcpy(&fld.flowidn_iif, RTA_DATA(rta[RTA_IIF-1]), sizeof(int)); |
| |
| if (fld.flowidn_iif) { |
| struct net_device *dev; |
| if ((dev = dev_get_by_index(&init_net, fld.flowidn_iif)) == NULL) { |
| kfree_skb(skb); |
| return -ENODEV; |
| } |
| if (!dev->dn_ptr) { |
| dev_put(dev); |
| kfree_skb(skb); |
| return -ENODEV; |
| } |
| skb->protocol = htons(ETH_P_DNA_RT); |
| skb->dev = dev; |
| cb->src = fld.saddr; |
| cb->dst = fld.daddr; |
| local_bh_disable(); |
| err = dn_route_input(skb); |
| local_bh_enable(); |
| memset(cb, 0, sizeof(struct dn_skb_cb)); |
| rt = (struct dn_route *)skb_dst(skb); |
| if (!err && -rt->dst.error) |
| err = rt->dst.error; |
| } else { |
| int oif = 0; |
| if (rta[RTA_OIF - 1]) |
| memcpy(&oif, RTA_DATA(rta[RTA_OIF - 1]), sizeof(int)); |
| fld.flowidn_oif = oif; |
| err = dn_route_output_key((struct dst_entry **)&rt, &fld, 0); |
| } |
| |
| if (skb->dev) |
| dev_put(skb->dev); |
| skb->dev = NULL; |
| if (err) |
| goto out_free; |
| skb_dst_set(skb, &rt->dst); |
| if (rtm->rtm_flags & RTM_F_NOTIFY) |
| rt->rt_flags |= RTCF_NOTIFY; |
| |
| err = dn_rt_fill_info(skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, RTM_NEWROUTE, 0, 0); |
| |
| if (err == 0) |
| goto out_free; |
| if (err < 0) { |
| err = -EMSGSIZE; |
| goto out_free; |
| } |
| |
| return rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid); |
| |
| out_free: |
| kfree_skb(skb); |
| return err; |
| } |
| |
| /* |
| * For routers, this is called from dn_fib_dump, but for endnodes its |
| * called directly from the rtnetlink dispatch table. |
| */ |
| int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| { |
| struct net *net = sock_net(skb->sk); |
| struct dn_route *rt; |
| int h, s_h; |
| int idx, s_idx; |
| struct rtmsg *rtm; |
| |
| if (!net_eq(net, &init_net)) |
| return 0; |
| |
| if (nlmsg_len(cb->nlh) < sizeof(struct rtmsg)) |
| return -EINVAL; |
| |
| rtm = nlmsg_data(cb->nlh); |
| if (!(rtm->rtm_flags & RTM_F_CLONED)) |
| return 0; |
| |
| s_h = cb->args[0]; |
| s_idx = idx = cb->args[1]; |
| for(h = 0; h <= dn_rt_hash_mask; h++) { |
| if (h < s_h) |
| continue; |
| if (h > s_h) |
| s_idx = 0; |
| rcu_read_lock_bh(); |
| for(rt = rcu_dereference_bh(dn_rt_hash_table[h].chain), idx = 0; |
| rt; |
| rt = rcu_dereference_bh(rt->dst.dn_next), idx++) { |
| if (idx < s_idx) |
| continue; |
| skb_dst_set(skb, dst_clone(&rt->dst)); |
| if (dn_rt_fill_info(skb, NETLINK_CB(cb->skb).pid, |
| cb->nlh->nlmsg_seq, RTM_NEWROUTE, |
| 1, NLM_F_MULTI) <= 0) { |
| skb_dst_drop(skb); |
| rcu_read_unlock_bh(); |
| goto done; |
| } |
| skb_dst_drop(skb); |
| } |
| rcu_read_unlock_bh(); |
| } |
| |
| done: |
| cb->args[0] = h; |
| cb->args[1] = idx; |
| return skb->len; |
| } |
| |
| #ifdef CONFIG_PROC_FS |
| struct dn_rt_cache_iter_state { |
| int bucket; |
| }; |
| |
| static struct dn_route *dn_rt_cache_get_first(struct seq_file *seq) |
| { |
| struct dn_route *rt = NULL; |
| struct dn_rt_cache_iter_state *s = seq->private; |
| |
| for(s->bucket = dn_rt_hash_mask; s->bucket >= 0; --s->bucket) { |
| rcu_read_lock_bh(); |
| rt = rcu_dereference_bh(dn_rt_hash_table[s->bucket].chain); |
| if (rt) |
| break; |
| rcu_read_unlock_bh(); |
| } |
| return rt; |
| } |
| |
| static struct dn_route *dn_rt_cache_get_next(struct seq_file *seq, struct dn_route *rt) |
| { |
| struct dn_rt_cache_iter_state *s = seq->private; |
| |
| rt = rcu_dereference_bh(rt->dst.dn_next); |
| while (!rt) { |
| rcu_read_unlock_bh(); |
| if (--s->bucket < 0) |
| break; |
| rcu_read_lock_bh(); |
| rt = rcu_dereference_bh(dn_rt_hash_table[s->bucket].chain); |
| } |
| return rt; |
| } |
| |
| static void *dn_rt_cache_seq_start(struct seq_file *seq, loff_t *pos) |
| { |
| struct dn_route *rt = dn_rt_cache_get_first(seq); |
| |
| if (rt) { |
| while(*pos && (rt = dn_rt_cache_get_next(seq, rt))) |
| --*pos; |
| } |
| return *pos ? NULL : rt; |
| } |
| |
| static void *dn_rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| { |
| struct dn_route *rt = dn_rt_cache_get_next(seq, v); |
| ++*pos; |
| return rt; |
| } |
| |
| static void dn_rt_cache_seq_stop(struct seq_file *seq, void *v) |
| { |
| if (v) |
| rcu_read_unlock_bh(); |
| } |
| |
| static int dn_rt_cache_seq_show(struct seq_file *seq, void *v) |
| { |
| struct dn_route *rt = v; |
| char buf1[DN_ASCBUF_LEN], buf2[DN_ASCBUF_LEN]; |
| |
| seq_printf(seq, "%-8s %-7s %-7s %04d %04d %04d\n", |
| rt->dst.dev ? rt->dst.dev->name : "*", |
| dn_addr2asc(le16_to_cpu(rt->rt_daddr), buf1), |
| dn_addr2asc(le16_to_cpu(rt->rt_saddr), buf2), |
| atomic_read(&rt->dst.__refcnt), |
| rt->dst.__use, 0); |
| return 0; |
| } |
| |
| static const struct seq_operations dn_rt_cache_seq_ops = { |
| .start = dn_rt_cache_seq_start, |
| .next = dn_rt_cache_seq_next, |
| .stop = dn_rt_cache_seq_stop, |
| .show = dn_rt_cache_seq_show, |
| }; |
| |
| static int dn_rt_cache_seq_open(struct inode *inode, struct file *file) |
| { |
| return seq_open_private(file, &dn_rt_cache_seq_ops, |
| sizeof(struct dn_rt_cache_iter_state)); |
| } |
| |
| static const struct file_operations dn_rt_cache_seq_fops = { |
| .owner = THIS_MODULE, |
| .open = dn_rt_cache_seq_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = seq_release_private, |
| }; |
| |
| #endif /* CONFIG_PROC_FS */ |
| |
| void __init dn_route_init(void) |
| { |
| int i, goal, order; |
| |
| dn_dst_ops.kmem_cachep = |
| kmem_cache_create("dn_dst_cache", sizeof(struct dn_route), 0, |
| SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
| dst_entries_init(&dn_dst_ops); |
| setup_timer(&dn_route_timer, dn_dst_check_expire, 0); |
| dn_route_timer.expires = jiffies + decnet_dst_gc_interval * HZ; |
| add_timer(&dn_route_timer); |
| |
| goal = totalram_pages >> (26 - PAGE_SHIFT); |
| |
| for(order = 0; (1UL << order) < goal; order++) |
| /* NOTHING */; |
| |
| /* |
| * Only want 1024 entries max, since the table is very, very unlikely |
| * to be larger than that. |
| */ |
| while(order && ((((1UL << order) * PAGE_SIZE) / |
| sizeof(struct dn_rt_hash_bucket)) >= 2048)) |
| order--; |
| |
| do { |
| dn_rt_hash_mask = (1UL << order) * PAGE_SIZE / |
| sizeof(struct dn_rt_hash_bucket); |
| while(dn_rt_hash_mask & (dn_rt_hash_mask - 1)) |
| dn_rt_hash_mask--; |
| dn_rt_hash_table = (struct dn_rt_hash_bucket *) |
| __get_free_pages(GFP_ATOMIC, order); |
| } while (dn_rt_hash_table == NULL && --order > 0); |
| |
| if (!dn_rt_hash_table) |
| panic("Failed to allocate DECnet route cache hash table\n"); |
| |
| printk(KERN_INFO |
| "DECnet: Routing cache hash table of %u buckets, %ldKbytes\n", |
| dn_rt_hash_mask, |
| (long)(dn_rt_hash_mask*sizeof(struct dn_rt_hash_bucket))/1024); |
| |
| dn_rt_hash_mask--; |
| for(i = 0; i <= dn_rt_hash_mask; i++) { |
| spin_lock_init(&dn_rt_hash_table[i].lock); |
| dn_rt_hash_table[i].chain = NULL; |
| } |
| |
| dn_dst_ops.gc_thresh = (dn_rt_hash_mask + 1); |
| |
| proc_net_fops_create(&init_net, "decnet_cache", S_IRUGO, &dn_rt_cache_seq_fops); |
| |
| #ifdef CONFIG_DECNET_ROUTER |
| rtnl_register(PF_DECnet, RTM_GETROUTE, dn_cache_getroute, |
| dn_fib_dump, NULL); |
| #else |
| rtnl_register(PF_DECnet, RTM_GETROUTE, dn_cache_getroute, |
| dn_cache_dump, NULL); |
| #endif |
| } |
| |
| void __exit dn_route_cleanup(void) |
| { |
| del_timer(&dn_route_timer); |
| dn_run_flush(0); |
| |
| proc_net_remove(&init_net, "decnet_cache"); |
| dst_entries_destroy(&dn_dst_ops); |
| } |
| |