#include <net/phonet/phonet.h>
#include <net/phonet/pn_dev.h>
-static struct net_proto_family phonet_proto_family;
-static struct phonet_protocol *phonet_proto_get(int protocol);
-static inline void phonet_proto_put(struct phonet_protocol *pp);
+/* Transport protocol registration */
+static struct phonet_protocol *proto_tab[PHONET_NPROTO] __read_mostly;
+
+static struct phonet_protocol *phonet_proto_get(int protocol)
+{
+ struct phonet_protocol *pp;
+
+ if (protocol >= PHONET_NPROTO)
+ return NULL;
+
+ rcu_read_lock();
+ pp = rcu_dereference(proto_tab[protocol]);
+ if (pp && !try_module_get(pp->prot->owner))
+ pp = NULL;
+ rcu_read_unlock();
+
+ return pp;
+}
+
+static inline void phonet_proto_put(struct phonet_protocol *pp)
+{
+ module_put(pp->prot->owner);
+}
/* protocol family functions */
-static int pn_socket_create(struct net *net, struct socket *sock, int protocol)
+static int pn_socket_create(struct net *net, struct socket *sock, int protocol,
+ int kern)
{
struct sock *sk;
struct pn_sock *pn;
struct phonet_protocol *pnp;
int err;
- if (net != &init_net)
- return -EAFNOSUPPORT;
-
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
case SOCK_DGRAM:
protocol = PN_PROTO_PHONET;
break;
+ case SOCK_SEQPACKET:
+ protocol = PN_PROTO_PIPE;
+ break;
default:
return -EPROTONOSUPPORT;
}
}
pnp = phonet_proto_get(protocol);
+ if (pnp == NULL &&
+ request_module("net-pf-%d-proto-%d", PF_PHONET, protocol) == 0)
+ pnp = phonet_proto_get(protocol);
+
if (pnp == NULL)
return -EPROTONOSUPPORT;
if (sock->type != pnp->sock_type) {
return err;
}
-static struct net_proto_family phonet_proto_family = {
- .family = AF_PHONET,
+static const struct net_proto_family phonet_proto_family = {
+ .family = PF_PHONET,
.create = pn_socket_create,
.owner = THIS_MODULE,
};
* Prepends an ISI header and sends a datagram.
*/
static int pn_send(struct sk_buff *skb, struct net_device *dev,
- u16 dst, u16 src, u8 res)
+ u16 dst, u16 src, u8 res, u8 irq)
{
struct phonethdr *ph;
int err;
- if (skb->len + 2 > 0xffff) {
- /* Phonet length field would overflow */
+ if (skb->len + 2 > 0xffff /* Phonet length field limit */ ||
+ skb->len + sizeof(struct phonethdr) > dev->mtu) {
err = -EMSGSIZE;
goto drop;
}
+ /* Broadcast sending is not implemented */
+ if (pn_addr(dst) == PNADDR_BROADCAST) {
+ err = -EOPNOTSUPP;
+ goto drop;
+ }
+
skb_reset_transport_header(skb);
WARN_ON(skb_headroom(skb) & 1); /* HW assumes word alignment */
skb_push(skb, sizeof(struct phonethdr));
skb->priority = 0;
skb->dev = dev;
- if (pn_addr(src) == pn_addr(dst)) {
+ if (skb->pkt_type == PACKET_LOOPBACK) {
skb_reset_mac_header(skb);
- skb->pkt_type = PACKET_LOOPBACK;
skb_orphan(skb);
- netif_rx_ni(skb);
+ if (irq)
+ netif_rx(skb);
+ else
+ netif_rx_ni(skb);
err = 0;
} else {
err = dev_hard_header(skb, dev, ntohs(skb->protocol),
return err;
}
+static int pn_raw_send(const void *data, int len, struct net_device *dev,
+ u16 dst, u16 src, u8 res)
+{
+ struct sk_buff *skb = alloc_skb(MAX_PHONET_HEADER + len, GFP_ATOMIC);
+ if (skb == NULL)
+ return -ENOMEM;
+
+ if (phonet_address_lookup(dev_net(dev), pn_addr(dst)) == 0)
+ skb->pkt_type = PACKET_LOOPBACK;
+
+ skb_reserve(skb, MAX_PHONET_HEADER);
+ __skb_put(skb, len);
+ skb_copy_to_linear_data(skb, data, len);
+ return pn_send(skb, dev, dst, src, res, 1);
+}
+
/*
* Create a Phonet header for the skb and send it out. Returns
* non-zero error code if failed. The skb is freed then.
int pn_skb_send(struct sock *sk, struct sk_buff *skb,
const struct sockaddr_pn *target)
{
+ struct net *net = sock_net(sk);
struct net_device *dev;
struct pn_sock *pn = pn_sk(sk);
int err;
err = -EHOSTUNREACH;
if (sk->sk_bound_dev_if)
- dev = dev_get_by_index(sock_net(sk), sk->sk_bound_dev_if);
- else
- dev = phonet_device_get(sock_net(sk));
+ dev = dev_get_by_index(net, sk->sk_bound_dev_if);
+ else if (phonet_address_lookup(net, daddr) == 0) {
+ dev = phonet_device_get(net);
+ skb->pkt_type = PACKET_LOOPBACK;
+ } else
+ dev = phonet_route_output(net, daddr);
+
if (!dev || !(dev->flags & IFF_UP))
goto drop;
src = pn_object(saddr, pn_obj(src));
err = pn_send(skb, dev, pn_sockaddr_get_object(target),
- src, pn_sockaddr_get_resource(target));
+ src, pn_sockaddr_get_resource(target), 0);
dev_put(dev);
return err;
}
EXPORT_SYMBOL(pn_skb_send);
+/* Do not send an error message in response to an error message */
+static inline int can_respond(struct sk_buff *skb)
+{
+ const struct phonethdr *ph;
+ const struct phonetmsg *pm;
+ u8 submsg_id;
+
+ if (!pskb_may_pull(skb, 3))
+ return 0;
+
+ ph = pn_hdr(skb);
+ if (ph->pn_res == PN_PREFIX && !pskb_may_pull(skb, 5))
+ return 0;
+ if (ph->pn_res == PN_COMMGR) /* indications */
+ return 0;
+
+ ph = pn_hdr(skb); /* re-acquires the pointer */
+ pm = pn_msg(skb);
+ if (pm->pn_msg_id != PN_COMMON_MESSAGE)
+ return 1;
+ submsg_id = (ph->pn_res == PN_PREFIX)
+ ? pm->pn_e_submsg_id : pm->pn_submsg_id;
+ if (submsg_id != PN_COMM_ISA_ENTITY_NOT_REACHABLE_RESP &&
+ pm->pn_e_submsg_id != PN_COMM_SERVICE_NOT_IDENTIFIED_RESP)
+ return 1;
+ return 0;
+}
+
+static int send_obj_unreachable(struct sk_buff *rskb)
+{
+ const struct phonethdr *oph = pn_hdr(rskb);
+ const struct phonetmsg *opm = pn_msg(rskb);
+ struct phonetmsg resp;
+
+ memset(&resp, 0, sizeof(resp));
+ resp.pn_trans_id = opm->pn_trans_id;
+ resp.pn_msg_id = PN_COMMON_MESSAGE;
+ if (oph->pn_res == PN_PREFIX) {
+ resp.pn_e_res_id = opm->pn_e_res_id;
+ resp.pn_e_submsg_id = PN_COMM_ISA_ENTITY_NOT_REACHABLE_RESP;
+ resp.pn_e_orig_msg_id = opm->pn_msg_id;
+ resp.pn_e_status = 0;
+ } else {
+ resp.pn_submsg_id = PN_COMM_ISA_ENTITY_NOT_REACHABLE_RESP;
+ resp.pn_orig_msg_id = opm->pn_msg_id;
+ resp.pn_status = 0;
+ }
+ return pn_raw_send(&resp, sizeof(resp), rskb->dev,
+ pn_object(oph->pn_sdev, oph->pn_sobj),
+ pn_object(oph->pn_rdev, oph->pn_robj),
+ oph->pn_res);
+}
+
+static int send_reset_indications(struct sk_buff *rskb)
+{
+ struct phonethdr *oph = pn_hdr(rskb);
+ static const u8 data[4] = {
+ 0x00 /* trans ID */, 0x10 /* subscribe msg */,
+ 0x00 /* subscription count */, 0x00 /* dummy */
+ };
+
+ return pn_raw_send(data, sizeof(data), rskb->dev,
+ pn_object(oph->pn_sdev, 0x00),
+ pn_object(oph->pn_rdev, oph->pn_robj),
+ PN_COMMGR);
+}
+
+
/* packet type functions */
/*
struct packet_type *pkttype,
struct net_device *orig_dev)
{
+ struct net *net = dev_net(dev);
struct phonethdr *ph;
- struct sock *sk;
struct sockaddr_pn sa;
u16 len;
- if (dev_net(dev) != &init_net)
- goto out;
-
/* check we have at least a full Phonet header */
if (!pskb_pull(skb, sizeof(struct phonethdr)))
goto out;
skb_reset_transport_header(skb);
pn_skb_get_dst_sockaddr(skb, &sa);
- if (pn_sockaddr_get_addr(&sa) == 0)
- goto out; /* currently, we cannot be device 0 */
- sk = pn_find_sock_by_sa(&sa);
- if (sk == NULL)
+ /* check if this is broadcasted */
+ if (pn_sockaddr_get_addr(&sa) == PNADDR_BROADCAST) {
+ pn_deliver_sock_broadcast(net, skb);
goto out;
+ }
+
+ /* check if we are the destination */
+ if (phonet_address_lookup(net, pn_sockaddr_get_addr(&sa)) == 0) {
+ /* Phonet packet input */
+ struct sock *sk = pn_find_sock_by_sa(net, &sa);
- /* Push data to the socket (or other sockets connected to it). */
- return sk_receive_skb(sk, skb, 0);
+ if (sk)
+ return sk_receive_skb(sk, skb, 0);
+
+ if (can_respond(skb)) {
+ send_obj_unreachable(skb);
+ send_reset_indications(skb);
+ }
+ } else if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
+ goto out; /* Race between address deletion and loopback */
+ else {
+ /* Phonet packet routing */
+ struct net_device *out_dev;
+
+ out_dev = phonet_route_output(net, pn_sockaddr_get_addr(&sa));
+ if (!out_dev) {
+ LIMIT_NETDEBUG(KERN_WARNING"No Phonet route to %02X\n",
+ pn_sockaddr_get_addr(&sa));
+ goto out;
+ }
+
+ __skb_push(skb, sizeof(struct phonethdr));
+ skb->dev = out_dev;
+ if (out_dev == dev) {
+ LIMIT_NETDEBUG(KERN_ERR"Phonet loop to %02X on %s\n",
+ pn_sockaddr_get_addr(&sa), dev->name);
+ goto out_dev;
+ }
+ /* Some drivers (e.g. TUN) do not allocate HW header space */
+ if (skb_cow_head(skb, out_dev->hard_header_len))
+ goto out_dev;
+
+ if (dev_hard_header(skb, out_dev, ETH_P_PHONET, NULL, NULL,
+ skb->len) < 0)
+ goto out_dev;
+ dev_queue_xmit(skb);
+ dev_put(out_dev);
+ return NET_RX_SUCCESS;
+out_dev:
+ dev_put(out_dev);
+ }
out:
kfree_skb(skb);
return NET_RX_DROP;
}
-static struct packet_type phonet_packet_type = {
- .type = __constant_htons(ETH_P_PHONET),
- .dev = NULL,
+static struct packet_type phonet_packet_type __read_mostly = {
+ .type = cpu_to_be16(ETH_P_PHONET),
.func = phonet_rcv,
};
-/* Transport protocol registration */
-static struct phonet_protocol *proto_tab[PHONET_NPROTO] __read_mostly;
-static DEFINE_SPINLOCK(proto_tab_lock);
+static DEFINE_MUTEX(proto_tab_lock);
int __init_or_module phonet_proto_register(int protocol,
struct phonet_protocol *pp)
if (err)
return err;
- spin_lock(&proto_tab_lock);
+ mutex_lock(&proto_tab_lock);
if (proto_tab[protocol])
err = -EBUSY;
else
- proto_tab[protocol] = pp;
- spin_unlock(&proto_tab_lock);
+ rcu_assign_pointer(proto_tab[protocol], pp);
+ mutex_unlock(&proto_tab_lock);
return err;
}
void phonet_proto_unregister(int protocol, struct phonet_protocol *pp)
{
- spin_lock(&proto_tab_lock);
+ mutex_lock(&proto_tab_lock);
BUG_ON(proto_tab[protocol] != pp);
- proto_tab[protocol] = NULL;
- spin_unlock(&proto_tab_lock);
+ rcu_assign_pointer(proto_tab[protocol], NULL);
+ mutex_unlock(&proto_tab_lock);
+ synchronize_rcu();
proto_unregister(pp->prot);
}
EXPORT_SYMBOL(phonet_proto_unregister);
-static struct phonet_protocol *phonet_proto_get(int protocol)
-{
- struct phonet_protocol *pp;
-
- if (protocol >= PHONET_NPROTO)
- return NULL;
-
- spin_lock(&proto_tab_lock);
- pp = proto_tab[protocol];
- if (pp && !try_module_get(pp->prot->owner))
- pp = NULL;
- spin_unlock(&proto_tab_lock);
-
- return pp;
-}
-
-static inline void phonet_proto_put(struct phonet_protocol *pp)
-{
- module_put(pp->prot->owner);
-}
-
/* Module registration */
static int __init phonet_init(void)
{
int err;
+ err = phonet_device_init();
+ if (err)
+ return err;
+
+ pn_sock_init();
err = sock_register(&phonet_proto_family);
if (err) {
printk(KERN_ALERT
"phonet protocol family initialization failed\n");
- return err;
+ goto err_sock;
}
- phonet_device_init();
dev_add_pack(&phonet_packet_type);
- phonet_netlink_register();
+ phonet_sysctl_init();
err = isi_register();
if (err)
return 0;
err:
- sock_unregister(AF_PHONET);
+ phonet_sysctl_exit();
+ sock_unregister(PF_PHONET);
dev_remove_pack(&phonet_packet_type);
+err_sock:
phonet_device_exit();
return err;
}
static void __exit phonet_exit(void)
{
isi_unregister();
- sock_unregister(AF_PHONET);
+ phonet_sysctl_exit();
+ sock_unregister(PF_PHONET);
dev_remove_pack(&phonet_packet_type);
phonet_device_exit();
}
module_exit(phonet_exit);
MODULE_DESCRIPTION("Phonet protocol stack for Linux");
MODULE_LICENSE("GPL");
+MODULE_ALIAS_NETPROTO(PF_PHONET);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff