diff options
Diffstat (limited to 'net/decnet/dn_dev.c')
| -rw-r--r-- | net/decnet/dn_dev.c | 1444 |
1 files changed, 1444 insertions, 0 deletions
diff --git a/net/decnet/dn_dev.c b/net/decnet/dn_dev.c new file mode 100644 index 00000000..c00e3077 --- /dev/null +++ b/net/decnet/dn_dev.c @@ -0,0 +1,1444 @@ +/* + * 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 Device Layer + * + * Authors: Steve Whitehouse <SteveW@ACM.org> + * Eduardo Marcelo Serrat <emserrat@geocities.com> + * + * Changes: + * Steve Whitehouse : Devices now see incoming frames so they + * can mark on who it came from. + * Steve Whitehouse : Fixed bug in creating neighbours. Each neighbour + * can now have a device specific setup func. + * Steve Whitehouse : Added /proc/sys/net/decnet/conf/<dev>/ + * Steve Whitehouse : Fixed bug which sometimes killed timer + * Steve Whitehouse : Multiple ifaddr support + * Steve Whitehouse : SIOCGIFCONF is now a compile time option + * Steve Whitehouse : /proc/sys/net/decnet/conf/<sys>/forwarding + * Steve Whitehouse : Removed timer1 - it's a user space issue now + * Patrick Caulfield : Fixed router hello message format + * Steve Whitehouse : Got rid of constant sizes for blksize for + * devices. All mtu based now. + */ + +#include <linux/capability.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/init.h> +#include <linux/net.h> +#include <linux/netdevice.h> +#include <linux/proc_fs.h> +#include <linux/seq_file.h> +#include <linux/timer.h> +#include <linux/string.h> +#include <linux/if_addr.h> +#include <linux/if_arp.h> +#include <linux/if_ether.h> +#include <linux/skbuff.h> +#include <linux/sysctl.h> +#include <linux/notifier.h> +#include <linux/slab.h> +#include <asm/uaccess.h> +#include <net/net_namespace.h> +#include <net/neighbour.h> +#include <net/dst.h> +#include <net/flow.h> +#include <net/fib_rules.h> +#include <net/netlink.h> +#include <net/dn.h> +#include <net/dn_dev.h> +#include <net/dn_route.h> +#include <net/dn_neigh.h> +#include <net/dn_fib.h> + +#define DN_IFREQ_SIZE (sizeof(struct ifreq) - sizeof(struct sockaddr) + sizeof(struct sockaddr_dn)) + +static char dn_rt_all_end_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x04,0x00,0x00}; +static char dn_rt_all_rt_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x03,0x00,0x00}; +static char dn_hiord[ETH_ALEN] = {0xAA,0x00,0x04,0x00,0x00,0x00}; +static unsigned char dn_eco_version[3] = {0x02,0x00,0x00}; + +extern struct neigh_table dn_neigh_table; + +/* + * decnet_address is kept in network order. + */ +__le16 decnet_address = 0; + +static DEFINE_SPINLOCK(dndev_lock); +static struct net_device *decnet_default_device; +static BLOCKING_NOTIFIER_HEAD(dnaddr_chain); + +static struct dn_dev *dn_dev_create(struct net_device *dev, int *err); +static void dn_dev_delete(struct net_device *dev); +static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa); + +static int dn_eth_up(struct net_device *); +static void dn_eth_down(struct net_device *); +static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa); +static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa); + +static struct dn_dev_parms dn_dev_list[] = { +{ + .type = ARPHRD_ETHER, /* Ethernet */ + .mode = DN_DEV_BCAST, + .state = DN_DEV_S_RU, + .t2 = 1, + .t3 = 10, + .name = "ethernet", + .up = dn_eth_up, + .down = dn_eth_down, + .timer3 = dn_send_brd_hello, +}, +{ + .type = ARPHRD_IPGRE, /* DECnet tunneled over GRE in IP */ + .mode = DN_DEV_BCAST, + .state = DN_DEV_S_RU, + .t2 = 1, + .t3 = 10, + .name = "ipgre", + .timer3 = dn_send_brd_hello, +}, +#if 0 +{ + .type = ARPHRD_X25, /* Bog standard X.25 */ + .mode = DN_DEV_UCAST, + .state = DN_DEV_S_DS, + .t2 = 1, + .t3 = 120, + .name = "x25", + .timer3 = dn_send_ptp_hello, +}, +#endif +#if 0 +{ + .type = ARPHRD_PPP, /* DECnet over PPP */ + .mode = DN_DEV_BCAST, + .state = DN_DEV_S_RU, + .t2 = 1, + .t3 = 10, + .name = "ppp", + .timer3 = dn_send_brd_hello, +}, +#endif +{ + .type = ARPHRD_DDCMP, /* DECnet over DDCMP */ + .mode = DN_DEV_UCAST, + .state = DN_DEV_S_DS, + .t2 = 1, + .t3 = 120, + .name = "ddcmp", + .timer3 = dn_send_ptp_hello, +}, +{ + .type = ARPHRD_LOOPBACK, /* Loopback interface - always last */ + .mode = DN_DEV_BCAST, + .state = DN_DEV_S_RU, + .t2 = 1, + .t3 = 10, + .name = "loopback", + .timer3 = dn_send_brd_hello, +} +}; + +#define DN_DEV_LIST_SIZE ARRAY_SIZE(dn_dev_list) + +#define DN_DEV_PARMS_OFFSET(x) offsetof(struct dn_dev_parms, x) + +#ifdef CONFIG_SYSCTL + +static int min_t2[] = { 1 }; +static int max_t2[] = { 60 }; /* No max specified, but this seems sensible */ +static int min_t3[] = { 1 }; +static int max_t3[] = { 8191 }; /* Must fit in 16 bits when multiplied by BCT3MULT or T3MULT */ + +static int min_priority[1]; +static int max_priority[] = { 127 }; /* From DECnet spec */ + +static int dn_forwarding_proc(ctl_table *, int, + void __user *, size_t *, loff_t *); +static struct dn_dev_sysctl_table { + struct ctl_table_header *sysctl_header; + ctl_table dn_dev_vars[5]; +} dn_dev_sysctl = { + NULL, + { + { + .procname = "forwarding", + .data = (void *)DN_DEV_PARMS_OFFSET(forwarding), + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = dn_forwarding_proc, + }, + { + .procname = "priority", + .data = (void *)DN_DEV_PARMS_OFFSET(priority), + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = &min_priority, + .extra2 = &max_priority + }, + { + .procname = "t2", + .data = (void *)DN_DEV_PARMS_OFFSET(t2), + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = &min_t2, + .extra2 = &max_t2 + }, + { + .procname = "t3", + .data = (void *)DN_DEV_PARMS_OFFSET(t3), + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = &min_t3, + .extra2 = &max_t3 + }, + {0} + }, +}; + +static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms) +{ + struct dn_dev_sysctl_table *t; + int i; + +#define DN_CTL_PATH_DEV 3 + + struct ctl_path dn_ctl_path[] = { + { .procname = "net", }, + { .procname = "decnet", }, + { .procname = "conf", }, + { /* to be set */ }, + { }, + }; + + t = kmemdup(&dn_dev_sysctl, sizeof(*t), GFP_KERNEL); + if (t == NULL) + return; + + for(i = 0; i < ARRAY_SIZE(t->dn_dev_vars) - 1; i++) { + long offset = (long)t->dn_dev_vars[i].data; + t->dn_dev_vars[i].data = ((char *)parms) + offset; + } + + if (dev) { + dn_ctl_path[DN_CTL_PATH_DEV].procname = dev->name; + } else { + dn_ctl_path[DN_CTL_PATH_DEV].procname = parms->name; + } + + t->dn_dev_vars[0].extra1 = (void *)dev; + + t->sysctl_header = register_sysctl_paths(dn_ctl_path, t->dn_dev_vars); + if (t->sysctl_header == NULL) + kfree(t); + else + parms->sysctl = t; +} + +static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms) +{ + if (parms->sysctl) { + struct dn_dev_sysctl_table *t = parms->sysctl; + parms->sysctl = NULL; + unregister_sysctl_table(t->sysctl_header); + kfree(t); + } +} + +static int dn_forwarding_proc(ctl_table *table, int write, + void __user *buffer, + size_t *lenp, loff_t *ppos) +{ +#ifdef CONFIG_DECNET_ROUTER + struct net_device *dev = table->extra1; + struct dn_dev *dn_db; + int err; + int tmp, old; + + if (table->extra1 == NULL) + return -EINVAL; + + dn_db = rcu_dereference_raw(dev->dn_ptr); + old = dn_db->parms.forwarding; + + err = proc_dointvec(table, write, buffer, lenp, ppos); + + if ((err >= 0) && write) { + if (dn_db->parms.forwarding < 0) + dn_db->parms.forwarding = 0; + if (dn_db->parms.forwarding > 2) + dn_db->parms.forwarding = 2; + /* + * What an ugly hack this is... its works, just. It + * would be nice if sysctl/proc were just that little + * bit more flexible so I don't have to write a special + * routine, or suffer hacks like this - SJW + */ + tmp = dn_db->parms.forwarding; + dn_db->parms.forwarding = old; + if (dn_db->parms.down) + dn_db->parms.down(dev); + dn_db->parms.forwarding = tmp; + if (dn_db->parms.up) + dn_db->parms.up(dev); + } + + return err; +#else + return -EINVAL; +#endif +} + +#else /* CONFIG_SYSCTL */ +static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms) +{ +} +static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms) +{ +} + +#endif /* CONFIG_SYSCTL */ + +static inline __u16 mtu2blksize(struct net_device *dev) +{ + u32 blksize = dev->mtu; + if (blksize > 0xffff) + blksize = 0xffff; + + if (dev->type == ARPHRD_ETHER || + dev->type == ARPHRD_PPP || + dev->type == ARPHRD_IPGRE || + dev->type == ARPHRD_LOOPBACK) + blksize -= 2; + + return (__u16)blksize; +} + +static struct dn_ifaddr *dn_dev_alloc_ifa(void) +{ + struct dn_ifaddr *ifa; + + ifa = kzalloc(sizeof(*ifa), GFP_KERNEL); + + return ifa; +} + +static void dn_dev_free_ifa(struct dn_ifaddr *ifa) +{ + kfree_rcu(ifa, rcu); +} + +static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr __rcu **ifap, int destroy) +{ + struct dn_ifaddr *ifa1 = rtnl_dereference(*ifap); + unsigned char mac_addr[6]; + struct net_device *dev = dn_db->dev; + + ASSERT_RTNL(); + + *ifap = ifa1->ifa_next; + + if (dn_db->dev->type == ARPHRD_ETHER) { + if (ifa1->ifa_local != dn_eth2dn(dev->dev_addr)) { + dn_dn2eth(mac_addr, ifa1->ifa_local); + dev_mc_del(dev, mac_addr); + } + } + + dn_ifaddr_notify(RTM_DELADDR, ifa1); + blocking_notifier_call_chain(&dnaddr_chain, NETDEV_DOWN, ifa1); + if (destroy) { + dn_dev_free_ifa(ifa1); + + if (dn_db->ifa_list == NULL) + dn_dev_delete(dn_db->dev); + } +} + +static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa) +{ + struct net_device *dev = dn_db->dev; + struct dn_ifaddr *ifa1; + unsigned char mac_addr[6]; + + ASSERT_RTNL(); + + /* Check for duplicates */ + for (ifa1 = rtnl_dereference(dn_db->ifa_list); + ifa1 != NULL; + ifa1 = rtnl_dereference(ifa1->ifa_next)) { + if (ifa1->ifa_local == ifa->ifa_local) + return -EEXIST; + } + + if (dev->type == ARPHRD_ETHER) { + if (ifa->ifa_local != dn_eth2dn(dev->dev_addr)) { + dn_dn2eth(mac_addr, ifa->ifa_local); + dev_mc_add(dev, mac_addr); + } + } + + ifa->ifa_next = dn_db->ifa_list; + rcu_assign_pointer(dn_db->ifa_list, ifa); + + dn_ifaddr_notify(RTM_NEWADDR, ifa); + blocking_notifier_call_chain(&dnaddr_chain, NETDEV_UP, ifa); + + return 0; +} + +static int dn_dev_set_ifa(struct net_device *dev, struct dn_ifaddr *ifa) +{ + struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr); + int rv; + + if (dn_db == NULL) { + int err; + dn_db = dn_dev_create(dev, &err); + if (dn_db == NULL) + return err; + } + + ifa->ifa_dev = dn_db; + + if (dev->flags & IFF_LOOPBACK) + ifa->ifa_scope = RT_SCOPE_HOST; + + rv = dn_dev_insert_ifa(dn_db, ifa); + if (rv) + dn_dev_free_ifa(ifa); + return rv; +} + + +int dn_dev_ioctl(unsigned int cmd, void __user *arg) +{ + char buffer[DN_IFREQ_SIZE]; + struct ifreq *ifr = (struct ifreq *)buffer; + struct sockaddr_dn *sdn = (struct sockaddr_dn *)&ifr->ifr_addr; + struct dn_dev *dn_db; + struct net_device *dev; + struct dn_ifaddr *ifa = NULL; + struct dn_ifaddr __rcu **ifap = NULL; + int ret = 0; + + if (copy_from_user(ifr, arg, DN_IFREQ_SIZE)) + return -EFAULT; + ifr->ifr_name[IFNAMSIZ-1] = 0; + + dev_load(&init_net, ifr->ifr_name); + + switch (cmd) { + case SIOCGIFADDR: + break; + case SIOCSIFADDR: + if (!capable(CAP_NET_ADMIN)) + return -EACCES; + if (sdn->sdn_family != AF_DECnet) + return -EINVAL; + break; + default: + return -EINVAL; + } + + rtnl_lock(); + + if ((dev = __dev_get_by_name(&init_net, ifr->ifr_name)) == NULL) { + ret = -ENODEV; + goto done; + } + + if ((dn_db = rtnl_dereference(dev->dn_ptr)) != NULL) { + for (ifap = &dn_db->ifa_list; + (ifa = rtnl_dereference(*ifap)) != NULL; + ifap = &ifa->ifa_next) + if (strcmp(ifr->ifr_name, ifa->ifa_label) == 0) + break; + } + + if (ifa == NULL && cmd != SIOCSIFADDR) { + ret = -EADDRNOTAVAIL; + goto done; + } + + switch (cmd) { + case SIOCGIFADDR: + *((__le16 *)sdn->sdn_nodeaddr) = ifa->ifa_local; + goto rarok; + + case SIOCSIFADDR: + if (!ifa) { + if ((ifa = dn_dev_alloc_ifa()) == NULL) { + ret = -ENOBUFS; + break; + } + memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); + } else { + if (ifa->ifa_local == dn_saddr2dn(sdn)) + break; + dn_dev_del_ifa(dn_db, ifap, 0); + } + + ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn); + + ret = dn_dev_set_ifa(dev, ifa); + } +done: + rtnl_unlock(); + + return ret; +rarok: + if (copy_to_user(arg, ifr, DN_IFREQ_SIZE)) + ret = -EFAULT; + goto done; +} + +struct net_device *dn_dev_get_default(void) +{ + struct net_device *dev; + + spin_lock(&dndev_lock); + dev = decnet_default_device; + if (dev) { + if (dev->dn_ptr) + dev_hold(dev); + else + dev = NULL; + } + spin_unlock(&dndev_lock); + + return dev; +} + +int dn_dev_set_default(struct net_device *dev, int force) +{ + struct net_device *old = NULL; + int rv = -EBUSY; + if (!dev->dn_ptr) + return -ENODEV; + + spin_lock(&dndev_lock); + if (force || decnet_default_device == NULL) { + old = decnet_default_device; + decnet_default_device = dev; + rv = 0; + } + spin_unlock(&dndev_lock); + + if (old) + dev_put(old); + return rv; +} + +static void dn_dev_check_default(struct net_device *dev) +{ + spin_lock(&dndev_lock); + if (dev == decnet_default_device) { + decnet_default_device = NULL; + } else { + dev = NULL; + } + spin_unlock(&dndev_lock); + + if (dev) + dev_put(dev); +} + +/* + * Called with RTNL + */ +static struct dn_dev *dn_dev_by_index(int ifindex) +{ + struct net_device *dev; + struct dn_dev *dn_dev = NULL; + + dev = __dev_get_by_index(&init_net, ifindex); + if (dev) + dn_dev = rtnl_dereference(dev->dn_ptr); + + return dn_dev; +} + +static const struct nla_policy dn_ifa_policy[IFA_MAX+1] = { + [IFA_ADDRESS] = { .type = NLA_U16 }, + [IFA_LOCAL] = { .type = NLA_U16 }, + [IFA_LABEL] = { .type = NLA_STRING, + .len = IFNAMSIZ - 1 }, +}; + +static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) +{ + struct net *net = sock_net(skb->sk); + struct nlattr *tb[IFA_MAX+1]; + struct dn_dev *dn_db; + struct ifaddrmsg *ifm; + struct dn_ifaddr *ifa; + struct dn_ifaddr __rcu **ifap; + int err = -EINVAL; + + if (!net_eq(net, &init_net)) + goto errout; + + err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy); + if (err < 0) + goto errout; + + err = -ENODEV; + ifm = nlmsg_data(nlh); + if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL) + goto errout; + + err = -EADDRNOTAVAIL; + for (ifap = &dn_db->ifa_list; + (ifa = rtnl_dereference(*ifap)) != NULL; + ifap = &ifa->ifa_next) { + if (tb[IFA_LOCAL] && + nla_memcmp(tb[IFA_LOCAL], &ifa->ifa_local, 2)) + continue; + + if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label)) + continue; + + dn_dev_del_ifa(dn_db, ifap, 1); + return 0; + } + +errout: + return err; +} + +static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) +{ + struct net *net = sock_net(skb->sk); + struct nlattr *tb[IFA_MAX+1]; + struct net_device *dev; + struct dn_dev *dn_db; + struct ifaddrmsg *ifm; + struct dn_ifaddr *ifa; + int err; + + if (!net_eq(net, &init_net)) + return -EINVAL; + + err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy); + if (err < 0) + return err; + + if (tb[IFA_LOCAL] == NULL) + return -EINVAL; + + ifm = nlmsg_data(nlh); + if ((dev = __dev_get_by_index(&init_net, ifm->ifa_index)) == NULL) + return -ENODEV; + + if ((dn_db = rtnl_dereference(dev->dn_ptr)) == NULL) { + dn_db = dn_dev_create(dev, &err); + if (!dn_db) + return err; + } + + if ((ifa = dn_dev_alloc_ifa()) == NULL) + return -ENOBUFS; + + if (tb[IFA_ADDRESS] == NULL) + tb[IFA_ADDRESS] = tb[IFA_LOCAL]; + + ifa->ifa_local = nla_get_le16(tb[IFA_LOCAL]); + ifa->ifa_address = nla_get_le16(tb[IFA_ADDRESS]); + ifa->ifa_flags = ifm->ifa_flags; + ifa->ifa_scope = ifm->ifa_scope; + ifa->ifa_dev = dn_db; + + if (tb[IFA_LABEL]) + nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ); + else + memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); + + err = dn_dev_insert_ifa(dn_db, ifa); + if (err) + dn_dev_free_ifa(ifa); + + return err; +} + +static inline size_t dn_ifaddr_nlmsg_size(void) +{ + return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) + + nla_total_size(IFNAMSIZ) /* IFA_LABEL */ + + nla_total_size(2) /* IFA_ADDRESS */ + + nla_total_size(2); /* IFA_LOCAL */ +} + +static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa, + u32 pid, u32 seq, int event, unsigned int flags) +{ + struct ifaddrmsg *ifm; + struct nlmsghdr *nlh; + + nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags); + if (nlh == NULL) + return -EMSGSIZE; + + ifm = nlmsg_data(nlh); + ifm->ifa_family = AF_DECnet; + ifm->ifa_prefixlen = 16; + ifm->ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT; + ifm->ifa_scope = ifa->ifa_scope; + ifm->ifa_index = ifa->ifa_dev->dev->ifindex; + + if (ifa->ifa_address) + NLA_PUT_LE16(skb, IFA_ADDRESS, ifa->ifa_address); + if (ifa->ifa_local) + NLA_PUT_LE16(skb, IFA_LOCAL, ifa->ifa_local); + if (ifa->ifa_label[0]) + NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label); + + return nlmsg_end(skb, nlh); + +nla_put_failure: + nlmsg_cancel(skb, nlh); + return -EMSGSIZE; +} + +static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa) +{ + struct sk_buff *skb; + int err = -ENOBUFS; + + skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL); + if (skb == NULL) + goto errout; + + err = dn_nl_fill_ifaddr(skb, ifa, 0, 0, event, 0); + if (err < 0) { + /* -EMSGSIZE implies BUG in dn_ifaddr_nlmsg_size() */ + WARN_ON(err == -EMSGSIZE); + kfree_skb(skb); + goto errout; + } + rtnl_notify(skb, &init_net, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL); + return; +errout: + if (err < 0) + rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_IFADDR, err); +} + +static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) +{ + struct net *net = sock_net(skb->sk); + int idx, dn_idx = 0, skip_ndevs, skip_naddr; + struct net_device *dev; + struct dn_dev *dn_db; + struct dn_ifaddr *ifa; + + if (!net_eq(net, &init_net)) + return 0; + + skip_ndevs = cb->args[0]; + skip_naddr = cb->args[1]; + + idx = 0; + rcu_read_lock(); + for_each_netdev_rcu(&init_net, dev) { + if (idx < skip_ndevs) + goto cont; + else if (idx > skip_ndevs) { + /* Only skip over addresses for first dev dumped + * in this iteration (idx == skip_ndevs) */ + skip_naddr = 0; + } + + if ((dn_db = rcu_dereference(dev->dn_ptr)) == NULL) + goto cont; + + for (ifa = rcu_dereference(dn_db->ifa_list), dn_idx = 0; ifa; + ifa = rcu_dereference(ifa->ifa_next), dn_idx++) { + if (dn_idx < skip_naddr) + continue; + + if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid, + cb->nlh->nlmsg_seq, RTM_NEWADDR, + NLM_F_MULTI) < 0) + goto done; + } +cont: + idx++; + } +done: + rcu_read_unlock(); + cb->args[0] = idx; + cb->args[1] = dn_idx; + + return skb->len; +} + +static int dn_dev_get_first(struct net_device *dev, __le16 *addr) +{ + struct dn_dev *dn_db; + struct dn_ifaddr *ifa; + int rv = -ENODEV; + + rcu_read_lock(); + dn_db = rcu_dereference(dev->dn_ptr); + if (dn_db == NULL) + goto out; + + ifa = rcu_dereference(dn_db->ifa_list); + if (ifa != NULL) { + *addr = ifa->ifa_local; + rv = 0; + } +out: + rcu_read_unlock(); + return rv; +} + +/* + * Find a default address to bind to. + * + * This is one of those areas where the initial VMS concepts don't really + * map onto the Linux concepts, and since we introduced multiple addresses + * per interface we have to cope with slightly odd ways of finding out what + * "our address" really is. Mostly it's not a problem; for this we just guess + * a sensible default. Eventually the routing code will take care of all the + * nasties for us I hope. + */ +int dn_dev_bind_default(__le16 *addr) +{ + struct net_device *dev; + int rv; + dev = dn_dev_get_default(); +last_chance: + if (dev) { + rv = dn_dev_get_first(dev, addr); + dev_put(dev); + if (rv == 0 || dev == init_net.loopback_dev) + return rv; + } + dev = init_net.loopback_dev; + dev_hold(dev); + goto last_chance; +} + +static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa) +{ + struct endnode_hello_message *msg; + struct sk_buff *skb = NULL; + __le16 *pktlen; + struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr); + + if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL) + return; + + skb->dev = dev; + + msg = (struct endnode_hello_message *)skb_put(skb,sizeof(*msg)); + + msg->msgflg = 0x0D; + memcpy(msg->tiver, dn_eco_version, 3); + dn_dn2eth(msg->id, ifa->ifa_local); + msg->iinfo = DN_RT_INFO_ENDN; + msg->blksize = cpu_to_le16(mtu2blksize(dev)); + msg->area = 0x00; + memset(msg->seed, 0, 8); + memcpy(msg->neighbor, dn_hiord, ETH_ALEN); + + if (dn_db->router) { + struct dn_neigh *dn = (struct dn_neigh *)dn_db->router; + dn_dn2eth(msg->neighbor, dn->addr); + } + + msg->timer = cpu_to_le16((unsigned short)dn_db->parms.t3); + msg->mpd = 0x00; + msg->datalen = 0x02; + memset(msg->data, 0xAA, 2); + + pktlen = (__le16 *)skb_push(skb,2); + *pktlen = cpu_to_le16(skb->len - 2); + + skb_reset_network_header(skb); + + dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id); +} + + +#define DRDELAY (5 * HZ) + +static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa) +{ + /* First check time since device went up */ + if ((jiffies - dn_db->uptime) < DRDELAY) + return 0; + + /* If there is no router, then yes... */ + if (!dn_db->router) + return 1; + + /* otherwise only if we have a higher priority or.. */ + if (dn->priority < dn_db->parms.priority) + return 1; + + /* if we have equal priority and a higher node number */ + if (dn->priority != dn_db->parms.priority) + return 0; + + if (le16_to_cpu(dn->addr) < le16_to_cpu(ifa->ifa_local)) + return 1; + + return 0; +} + +static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa) +{ + int n; + struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr); + struct dn_neigh *dn = (struct dn_neigh *)dn_db->router; + struct sk_buff *skb; + size_t size; + unsigned char *ptr; + unsigned char *i1, *i2; + __le16 *pktlen; + char *src; + + if (mtu2blksize(dev) < (26 + 7)) + return; + + n = mtu2blksize(dev) - 26; + n /= 7; + + if (n > 32) + n = 32; + + size = 2 + 26 + 7 * n; + + if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL) + return; + + skb->dev = dev; + ptr = skb_put(skb, size); + + *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH; + *ptr++ = 2; /* ECO */ + *ptr++ = 0; + *ptr++ = 0; + dn_dn2eth(ptr, ifa->ifa_local); + src = ptr; + ptr += ETH_ALEN; + *ptr++ = dn_db->parms.forwarding == 1 ? + DN_RT_INFO_L1RT : DN_RT_INFO_L2RT; + *((__le16 *)ptr) = cpu_to_le16(mtu2blksize(dev)); + ptr += 2; + *ptr++ = dn_db->parms.priority; /* Priority */ + *ptr++ = 0; /* Area: Reserved */ + *((__le16 *)ptr) = cpu_to_le16((unsigned short)dn_db->parms.t3); + ptr += 2; + *ptr++ = 0; /* MPD: Reserved */ + i1 = ptr++; + memset(ptr, 0, 7); /* Name: Reserved */ + ptr += 7; + i2 = ptr++; + + n = dn_neigh_elist(dev, ptr, n); + + *i2 = 7 * n; + *i1 = 8 + *i2; + + skb_trim(skb, (27 + *i2)); + + pktlen = (__le16 *)skb_push(skb, 2); + *pktlen = cpu_to_le16(skb->len - 2); + + skb_reset_network_header(skb); + + if (dn_am_i_a_router(dn, dn_db, ifa)) { + struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC); + if (skb2) { + dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src); + } + } + + dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src); +} + +static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa) +{ + struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr); + + if (dn_db->parms.forwarding == 0) + dn_send_endnode_hello(dev, ifa); + else + dn_send_router_hello(dev, ifa); +} + +static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa) +{ + int tdlen = 16; + int size = dev->hard_header_len + 2 + 4 + tdlen; + struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC); + int i; + unsigned char *ptr; + char src[ETH_ALEN]; + + if (skb == NULL) + return ; + + skb->dev = dev; + skb_push(skb, dev->hard_header_len); + ptr = skb_put(skb, 2 + 4 + tdlen); + + *ptr++ = DN_RT_PKT_HELO; + *((__le16 *)ptr) = ifa->ifa_local; + ptr += 2; + *ptr++ = tdlen; + + for(i = 0; i < tdlen; i++) + *ptr++ = 0252; + + dn_dn2eth(src, ifa->ifa_local); + dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src); +} + +static int dn_eth_up(struct net_device *dev) +{ + struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr); + + if (dn_db->parms.forwarding == 0) + dev_mc_add(dev, dn_rt_all_end_mcast); + else + dev_mc_add(dev, dn_rt_all_rt_mcast); + + dn_db->use_long = 1; + + return 0; +} + +static void dn_eth_down(struct net_device *dev) +{ + struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr); + + if (dn_db->parms.forwarding == 0) + dev_mc_del(dev, dn_rt_all_end_mcast); + else + dev_mc_del(dev, dn_rt_all_rt_mcast); +} + +static void dn_dev_set_timer(struct net_device *dev); + +static void dn_dev_timer_func(unsigned long arg) +{ + struct net_device *dev = (struct net_device *)arg; + struct dn_dev *dn_db; + struct dn_ifaddr *ifa; + + rcu_read_lock(); + dn_db = rcu_dereference(dev->dn_ptr); + if (dn_db->t3 <= dn_db->parms.t2) { + if (dn_db->parms.timer3) { + for (ifa = rcu_dereference(dn_db->ifa_list); + ifa; + ifa = rcu_dereference(ifa->ifa_next)) { + if (!(ifa->ifa_flags & IFA_F_SECONDARY)) + dn_db->parms.timer3(dev, ifa); + } + } + dn_db->t3 = dn_db->parms.t3; + } else { + dn_db->t3 -= dn_db->parms.t2; + } + rcu_read_unlock(); + dn_dev_set_timer(dev); +} + +static void dn_dev_set_timer(struct net_device *dev) +{ + struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr); + + if (dn_db->parms.t2 > dn_db->parms.t3) + dn_db->parms.t2 = dn_db->parms.t3; + + dn_db->timer.data = (unsigned long)dev; + dn_db->timer.function = dn_dev_timer_func; + dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ); + + add_timer(&dn_db->timer); +} + +static struct dn_dev *dn_dev_create(struct net_device *dev, int *err) +{ + int i; + struct dn_dev_parms *p = dn_dev_list; + struct dn_dev *dn_db; + + for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) { + if (p->type == dev->type) + break; + } + + *err = -ENODEV; + if (i == DN_DEV_LIST_SIZE) + return NULL; + + *err = -ENOBUFS; + if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL) + return NULL; + + memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms)); + + rcu_assign_pointer(dev->dn_ptr, dn_db); + dn_db->dev = dev; + init_timer(&dn_db->timer); + + dn_db->uptime = jiffies; + + dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table); + if (!dn_db->neigh_parms) { + RCU_INIT_POINTER(dev->dn_ptr, NULL); + kfree(dn_db); + return NULL; + } + + if (dn_db->parms.up) { + if (dn_db->parms.up(dev) < 0) { + neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms); + dev->dn_ptr = NULL; + kfree(dn_db); + return NULL; + } + } + + dn_dev_sysctl_register(dev, &dn_db->parms); + + dn_dev_set_timer(dev); + + *err = 0; + return dn_db; +} + + +/* + * This processes a device up event. We only start up + * the loopback device & ethernet devices with correct + * MAC addresses automatically. Others must be started + * specifically. + * + * FIXME: How should we configure the loopback address ? If we could dispense + * with using decnet_address here and for autobind, it will be one less thing + * for users to worry about setting up. + */ + +void dn_dev_up(struct net_device *dev) +{ + struct dn_ifaddr *ifa; + __le16 addr = decnet_address; + int maybe_default = 0; + struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr); + + if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK)) + return; + + /* + * Need to ensure that loopback device has a dn_db attached to it + * to allow creation of neighbours against it, even though it might + * not have a local address of its own. Might as well do the same for + * all autoconfigured interfaces. + */ + if (dn_db == NULL) { + int err; + dn_db = dn_dev_create(dev, &err); + if (dn_db == NULL) + return; + } + + if (dev->type == ARPHRD_ETHER) { + if (memcmp(dev->dev_addr, dn_hiord, 4) != 0) + return; + addr = dn_eth2dn(dev->dev_addr); + maybe_default = 1; + } + + if (addr == 0) + return; + + if ((ifa = dn_dev_alloc_ifa()) == NULL) + return; + + ifa->ifa_local = ifa->ifa_address = addr; + ifa->ifa_flags = 0; + ifa->ifa_scope = RT_SCOPE_UNIVERSE; + strcpy(ifa->ifa_label, dev->name); + + dn_dev_set_ifa(dev, ifa); + + /* + * Automagically set the default device to the first automatically + * configured ethernet card in the system. + */ + if (maybe_default) { + dev_hold(dev); + if (dn_dev_set_default(dev, 0)) + dev_put(dev); + } +} + +static void dn_dev_delete(struct net_device *dev) +{ + struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr); + + if (dn_db == NULL) + return; + + del_timer_sync(&dn_db->timer); + dn_dev_sysctl_unregister(&dn_db->parms); + dn_dev_check_default(dev); + neigh_ifdown(&dn_neigh_table, dev); + + if (dn_db->parms.down) + dn_db->parms.down(dev); + + dev->dn_ptr = NULL; + + neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms); + neigh_ifdown(&dn_neigh_table, dev); + + if (dn_db->router) + neigh_release(dn_db->router); + if (dn_db->peer) + neigh_release(dn_db->peer); + + kfree(dn_db); +} + +void dn_dev_down(struct net_device *dev) +{ + struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr); + struct dn_ifaddr *ifa; + + if (dn_db == NULL) + return; + + while ((ifa = rtnl_dereference(dn_db->ifa_list)) != NULL) { + dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0); + dn_dev_free_ifa(ifa); + } + + dn_dev_delete(dev); +} + +void dn_dev_init_pkt(struct sk_buff *skb) +{ +} + +void dn_dev_veri_pkt(struct sk_buff *skb) +{ +} + +void dn_dev_hello(struct sk_buff *skb) +{ +} + +void dn_dev_devices_off(void) +{ + struct net_device *dev; + + rtnl_lock(); + for_each_netdev(&init_net, dev) + dn_dev_down(dev); + rtnl_unlock(); + +} + +void dn_dev_devices_on(void) +{ + struct net_device *dev; + + rtnl_lock(); + for_each_netdev(&init_net, dev) { + if (dev->flags & IFF_UP) + dn_dev_up(dev); + } + rtnl_unlock(); +} + +int register_dnaddr_notifier(struct notifier_block *nb) +{ + return blocking_notifier_chain_register(&dnaddr_chain, nb); +} + +int unregister_dnaddr_notifier(struct notifier_block *nb) +{ + return blocking_notifier_chain_unregister(&dnaddr_chain, nb); +} + +#ifdef CONFIG_PROC_FS +static inline int is_dn_dev(struct net_device *dev) +{ + return dev->dn_ptr != NULL; +} + +static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos) + __acquires(RCU) +{ + int i; + struct net_device *dev; + + rcu_read_lock(); + + if (*pos == 0) + return SEQ_START_TOKEN; + + i = 1; + for_each_netdev_rcu(&init_net, dev) { + if (!is_dn_dev(dev)) + continue; + + if (i++ == *pos) + return dev; + } + + return NULL; +} + +static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos) +{ + struct net_device *dev; + + ++*pos; + + dev = v; + if (v == SEQ_START_TOKEN) + dev = net_device_entry(&init_net.dev_base_head); + + for_each_netdev_continue_rcu(&init_net, dev) { + if (!is_dn_dev(dev)) + continue; + + return dev; + } + + return NULL; +} + +static void dn_dev_seq_stop(struct seq_file *seq, void *v) + __releases(RCU) +{ + rcu_read_unlock(); +} + +static char *dn_type2asc(char type) +{ + switch (type) { + case DN_DEV_BCAST: + return "B"; + case DN_DEV_UCAST: + return "U"; + case DN_DEV_MPOINT: + return "M"; + } + + return "?"; +} + +static int dn_dev_seq_show(struct seq_file *seq, void *v) +{ + if (v == SEQ_START_TOKEN) + seq_puts(seq, "Name Flags T1 Timer1 T3 Timer3 BlkSize Pri State DevType Router Peer\n"); + else { + struct net_device *dev = v; + char peer_buf[DN_ASCBUF_LEN]; + char router_buf[DN_ASCBUF_LEN]; + struct dn_dev *dn_db = rcu_dereference(dev->dn_ptr); + + seq_printf(seq, "%-8s %1s %04u %04u %04lu %04lu" + " %04hu %03d %02x %-10s %-7s %-7s\n", + dev->name ? dev->name : "???", + dn_type2asc(dn_db->parms.mode), + 0, 0, + dn_db->t3, dn_db->parms.t3, + mtu2blksize(dev), + dn_db->parms.priority, + dn_db->parms.state, dn_db->parms.name, + dn_db->router ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->router->primary_key), router_buf) : "", + dn_db->peer ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->peer->primary_key), peer_buf) : ""); + } + return 0; +} + +static const struct seq_operations dn_dev_seq_ops = { + .start = dn_dev_seq_start, + .next = dn_dev_seq_next, + .stop = dn_dev_seq_stop, + .show = dn_dev_seq_show, +}; + +static int dn_dev_seq_open(struct inode *inode, struct file *file) +{ + return seq_open(file, &dn_dev_seq_ops); +} + +static const struct file_operations dn_dev_seq_fops = { + .owner = THIS_MODULE, + .open = dn_dev_seq_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release, +}; + +#endif /* CONFIG_PROC_FS */ + +static int addr[2]; +module_param_array(addr, int, NULL, 0444); +MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node"); + +void __init dn_dev_init(void) +{ + if (addr[0] > 63 || addr[0] < 0) { + printk(KERN_ERR "DECnet: Area must be between 0 and 63"); + return; + } + + if (addr[1] > 1023 || addr[1] < 0) { + printk(KERN_ERR "DECnet: Node must be between 0 and 1023"); + return; + } + + decnet_address = cpu_to_le16((addr[0] << 10) | addr[1]); + + dn_dev_devices_on(); + + rtnl_register(PF_DECnet, RTM_NEWADDR, dn_nl_newaddr, NULL, NULL); + rtnl_register(PF_DECnet, RTM_DELADDR, dn_nl_deladdr, NULL, NULL); + rtnl_register(PF_DECnet, RTM_GETADDR, NULL, dn_nl_dump_ifaddr, NULL); + + proc_net_fops_create(&init_net, "decnet_dev", S_IRUGO, &dn_dev_seq_fops); + +#ifdef CONFIG_SYSCTL + { + int i; + for(i = 0; i < DN_DEV_LIST_SIZE; i++) + dn_dev_sysctl_register(NULL, &dn_dev_list[i]); + } +#endif /* CONFIG_SYSCTL */ +} + +void __exit dn_dev_cleanup(void) +{ +#ifdef CONFIG_SYSCTL + { + int i; + for(i = 0; i < DN_DEV_LIST_SIZE; i++) + dn_dev_sysctl_unregister(&dn_dev_list[i]); + } +#endif /* CONFIG_SYSCTL */ + + proc_net_remove(&init_net, "decnet_dev"); + + dn_dev_devices_off(); +} |