diff options
Diffstat (limited to 'net/phonet/pn_dev.c')
| -rw-r--r-- | net/phonet/pn_dev.c | 131 |
1 files changed, 125 insertions, 6 deletions
diff --git a/net/phonet/pn_dev.c b/net/phonet/pn_dev.c index 5f42f30dd168..6d64fda1afc9 100644 --- a/net/phonet/pn_dev.c +++ b/net/phonet/pn_dev.c @@ -33,8 +33,14 @@ #include <net/netns/generic.h> #include <net/phonet/pn_dev.h> +struct phonet_routes { + spinlock_t lock; + struct net_device *table[64]; +}; + struct phonet_net { struct phonet_device_list pndevs; + struct phonet_routes routes; }; int phonet_net_id; @@ -154,10 +160,11 @@ int phonet_address_del(struct net_device *dev, u8 addr) } /* Gets a source address toward a destination, through a interface. */ -u8 phonet_address_get(struct net_device *dev, u8 addr) +u8 phonet_address_get(struct net_device *dev, u8 daddr) { struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev)); struct phonet_device *pnd; + u8 saddr; spin_lock_bh(&pndevs->lock); pnd = __phonet_get(dev); @@ -165,12 +172,26 @@ u8 phonet_address_get(struct net_device *dev, u8 addr) BUG_ON(bitmap_empty(pnd->addrs, 64)); /* Use same source address as destination, if possible */ - if (!test_bit(addr >> 2, pnd->addrs)) - addr = find_first_bit(pnd->addrs, 64) << 2; + if (test_bit(daddr >> 2, pnd->addrs)) + saddr = daddr; + else + saddr = find_first_bit(pnd->addrs, 64) << 2; } else - addr = PN_NO_ADDR; + saddr = PN_NO_ADDR; spin_unlock_bh(&pndevs->lock); - return addr; + + if (saddr == PN_NO_ADDR) { + /* Fallback to another device */ + struct net_device *def_dev; + + def_dev = phonet_device_get(dev_net(dev)); + if (def_dev) { + if (def_dev != dev) + saddr = phonet_address_get(def_dev, daddr); + dev_put(def_dev); + } + } + return saddr; } int phonet_address_lookup(struct net *net, u8 addr) @@ -219,6 +240,27 @@ static int phonet_device_autoconf(struct net_device *dev) return 0; } +static void phonet_route_autodel(struct net_device *dev) +{ + struct phonet_net *pnn = net_generic(dev_net(dev), phonet_net_id); + unsigned i; + DECLARE_BITMAP(deleted, 64); + + /* Remove left-over Phonet routes */ + bitmap_zero(deleted, 64); + spin_lock_bh(&pnn->routes.lock); + for (i = 0; i < 64; i++) + if (dev == pnn->routes.table[i]) { + set_bit(i, deleted); + pnn->routes.table[i] = NULL; + dev_put(dev); + } + spin_unlock_bh(&pnn->routes.lock); + for (i = find_first_bit(deleted, 64); i < 64; + i = find_next_bit(deleted, 64, i + 1)) + rtm_phonet_notify(RTM_DELROUTE, dev, i); +} + /* notify Phonet of device events */ static int phonet_device_notify(struct notifier_block *me, unsigned long what, void *arg) @@ -232,6 +274,7 @@ static int phonet_device_notify(struct notifier_block *me, unsigned long what, break; case NETDEV_UNREGISTER: phonet_device_destroy(dev); + phonet_route_autodel(dev); break; } return 0; @@ -246,7 +289,7 @@ static struct notifier_block phonet_device_notifier = { /* Per-namespace Phonet devices handling */ static int phonet_init_net(struct net *net) { - struct phonet_net *pnn = kmalloc(sizeof(*pnn), GFP_KERNEL); + struct phonet_net *pnn = kzalloc(sizeof(*pnn), GFP_KERNEL); if (!pnn) return -ENOMEM; @@ -257,6 +300,7 @@ static int phonet_init_net(struct net *net) INIT_LIST_HEAD(&pnn->pndevs.list); spin_lock_init(&pnn->pndevs.lock); + spin_lock_init(&pnn->routes.lock); net_assign_generic(net, phonet_net_id, pnn); return 0; } @@ -265,10 +309,19 @@ static void phonet_exit_net(struct net *net) { struct phonet_net *pnn = net_generic(net, phonet_net_id); struct net_device *dev; + unsigned i; rtnl_lock(); for_each_netdev(net, dev) phonet_device_destroy(dev); + + for (i = 0; i < 64; i++) { + dev = pnn->routes.table[i]; + if (dev) { + rtm_phonet_notify(RTM_DELROUTE, dev, i); + dev_put(dev); + } + } rtnl_unlock(); proc_net_remove(net, "phonet"); @@ -300,3 +353,69 @@ void phonet_device_exit(void) unregister_netdevice_notifier(&phonet_device_notifier); unregister_pernet_gen_device(phonet_net_id, &phonet_net_ops); } + +int phonet_route_add(struct net_device *dev, u8 daddr) +{ + struct phonet_net *pnn = net_generic(dev_net(dev), phonet_net_id); + struct phonet_routes *routes = &pnn->routes; + int err = -EEXIST; + + daddr = daddr >> 2; + spin_lock_bh(&routes->lock); + if (routes->table[daddr] == NULL) { + routes->table[daddr] = dev; + dev_hold(dev); + err = 0; + } + spin_unlock_bh(&routes->lock); + return err; +} + +int phonet_route_del(struct net_device *dev, u8 daddr) +{ + struct phonet_net *pnn = net_generic(dev_net(dev), phonet_net_id); + struct phonet_routes *routes = &pnn->routes; + int err = -ENOENT; + + daddr = daddr >> 2; + spin_lock_bh(&routes->lock); + if (dev == routes->table[daddr]) { + routes->table[daddr] = NULL; + dev_put(dev); + err = 0; + } + spin_unlock_bh(&routes->lock); + return err; +} + +struct net_device *phonet_route_get(struct net *net, u8 daddr) +{ + struct phonet_net *pnn = net_generic(net, phonet_net_id); + struct phonet_routes *routes = &pnn->routes; + struct net_device *dev; + + ASSERT_RTNL(); /* no need to hold the device */ + + daddr >>= 2; + spin_lock_bh(&routes->lock); + dev = routes->table[daddr]; + spin_unlock_bh(&routes->lock); + return dev; +} + +struct net_device *phonet_route_output(struct net *net, u8 daddr) +{ + struct phonet_net *pnn = net_generic(net, phonet_net_id); + struct phonet_routes *routes = &pnn->routes; + struct net_device *dev; + + spin_lock_bh(&routes->lock); + dev = routes->table[daddr >> 2]; + if (dev) + dev_hold(dev); + spin_unlock_bh(&routes->lock); + + if (!dev) + dev = phonet_device_get(net); /* Default route */ + return dev; +} |