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-rw-r--r--net/phonet/af_phonet.c57
-rw-r--r--net/phonet/datagram.c6
-rw-r--r--net/phonet/pep.c2
-rw-r--r--net/phonet/pn_dev.c131
-rw-r--r--net/phonet/pn_netlink.c130
-rw-r--r--net/phonet/socket.c23
6 files changed, 331 insertions, 18 deletions
diff --git a/net/phonet/af_phonet.c b/net/phonet/af_phonet.c
index f60c0c2aacba..66737aa995ea 100644
--- a/net/phonet/af_phonet.c
+++ b/net/phonet/af_phonet.c
@@ -118,7 +118,7 @@ out:
return err;
}
-static struct net_proto_family phonet_proto_family = {
+static const struct net_proto_family phonet_proto_family = {
.family = PF_PHONET,
.create = pn_socket_create,
.owner = THIS_MODULE,
@@ -190,9 +190,8 @@ static int pn_send(struct sk_buff *skb, struct net_device *dev,
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);
if (irq)
netif_rx(skb);
@@ -222,6 +221,9 @@ static int pn_raw_send(const void *data, int len, struct net_device *dev,
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);
@@ -235,6 +237,7 @@ static int pn_raw_send(const void *data, int len, struct net_device *dev,
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;
@@ -243,9 +246,13 @@ int pn_skb_send(struct sock *sk, struct sk_buff *skb,
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;
@@ -369,6 +376,12 @@ static int phonet_rcv(struct sk_buff *skb, struct net_device *dev,
pn_skb_get_dst_sockaddr(skb, &sa);
+ /* 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 */
@@ -381,6 +394,38 @@ static int phonet_rcv(struct sk_buff *skb, struct net_device *dev,
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:
diff --git a/net/phonet/datagram.c b/net/phonet/datagram.c
index ef5c75c372e4..67f072e94d00 100644
--- a/net/phonet/datagram.c
+++ b/net/phonet/datagram.c
@@ -159,11 +159,9 @@ out_nofree:
static int pn_backlog_rcv(struct sock *sk, struct sk_buff *skb)
{
int err = sock_queue_rcv_skb(sk, skb);
- if (err < 0) {
+
+ if (err < 0)
kfree_skb(skb);
- if (err == -ENOMEM)
- atomic_inc(&sk->sk_drops);
- }
return err ? NET_RX_DROP : NET_RX_SUCCESS;
}
diff --git a/net/phonet/pep.c b/net/phonet/pep.c
index 5f32d217535b..cbaa1d67d77b 100644
--- a/net/phonet/pep.c
+++ b/net/phonet/pep.c
@@ -360,8 +360,6 @@ static int pipe_do_rcv(struct sock *sk, struct sk_buff *skb)
err = sock_queue_rcv_skb(sk, skb);
if (!err)
return 0;
- if (err == -ENOMEM)
- atomic_inc(&sk->sk_drops);
break;
}
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;
+}
diff --git a/net/phonet/pn_netlink.c b/net/phonet/pn_netlink.c
index d21fd3576610..d8f5d3fb9ee2 100644
--- a/net/phonet/pn_netlink.c
+++ b/net/phonet/pn_netlink.c
@@ -29,6 +29,8 @@
#include <net/sock.h>
#include <net/phonet/pn_dev.h>
+/* Device address handling */
+
static int fill_addr(struct sk_buff *skb, struct net_device *dev, u8 addr,
u32 pid, u32 seq, int event);
@@ -160,6 +162,131 @@ out:
return skb->len;
}
+/* Routes handling */
+
+static int fill_route(struct sk_buff *skb, struct net_device *dev, u8 dst,
+ u32 pid, u32 seq, int event)
+{
+ struct rtmsg *rtm;
+ struct nlmsghdr *nlh;
+
+ nlh = nlmsg_put(skb, pid, seq, event, sizeof(*rtm), 0);
+ if (nlh == NULL)
+ return -EMSGSIZE;
+
+ rtm = nlmsg_data(nlh);
+ rtm->rtm_family = AF_PHONET;
+ rtm->rtm_dst_len = 6;
+ rtm->rtm_src_len = 0;
+ rtm->rtm_tos = 0;
+ rtm->rtm_table = RT_TABLE_MAIN;
+ rtm->rtm_protocol = RTPROT_STATIC;
+ rtm->rtm_scope = RT_SCOPE_UNIVERSE;
+ rtm->rtm_type = RTN_UNICAST;
+ rtm->rtm_flags = 0;
+ NLA_PUT_U8(skb, RTA_DST, dst);
+ NLA_PUT_U32(skb, RTA_OIF, dev->ifindex);
+ return nlmsg_end(skb, nlh);
+
+nla_put_failure:
+ nlmsg_cancel(skb, nlh);
+ return -EMSGSIZE;
+}
+
+void rtm_phonet_notify(int event, struct net_device *dev, u8 dst)
+{
+ struct sk_buff *skb;
+ int err = -ENOBUFS;
+
+ skb = nlmsg_new(NLMSG_ALIGN(sizeof(struct ifaddrmsg)) +
+ nla_total_size(1) + nla_total_size(4), GFP_KERNEL);
+ if (skb == NULL)
+ goto errout;
+ err = fill_route(skb, dev, dst, 0, 0, event);
+ if (err < 0) {
+ WARN_ON(err == -EMSGSIZE);
+ kfree_skb(skb);
+ goto errout;
+ }
+ rtnl_notify(skb, dev_net(dev), 0,
+ RTNLGRP_PHONET_ROUTE, NULL, GFP_KERNEL);
+ return;
+errout:
+ if (err < 0)
+ rtnl_set_sk_err(dev_net(dev), RTNLGRP_PHONET_ROUTE, err);
+}
+
+static const struct nla_policy rtm_phonet_policy[RTA_MAX+1] = {
+ [RTA_DST] = { .type = NLA_U8 },
+ [RTA_OIF] = { .type = NLA_U32 },
+};
+
+static int route_doit(struct sk_buff *skb, struct nlmsghdr *nlh, void *attr)
+{
+ struct net *net = sock_net(skb->sk);
+ struct nlattr *tb[RTA_MAX+1];
+ struct net_device *dev;
+ struct rtmsg *rtm;
+ int err;
+ u8 dst;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ ASSERT_RTNL();
+
+ err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_phonet_policy);
+ if (err < 0)
+ return err;
+
+ rtm = nlmsg_data(nlh);
+ if (rtm->rtm_table != RT_TABLE_MAIN || rtm->rtm_type != RTN_UNICAST)
+ return -EINVAL;
+ if (tb[RTA_DST] == NULL || tb[RTA_OIF] == NULL)
+ return -EINVAL;
+ dst = nla_get_u8(tb[RTA_DST]);
+ if (dst & 3) /* Phonet addresses only have 6 high-order bits */
+ return -EINVAL;
+
+ dev = __dev_get_by_index(net, nla_get_u32(tb[RTA_OIF]));
+ if (dev == NULL)
+ return -ENODEV;
+
+ if (nlh->nlmsg_type == RTM_NEWROUTE)
+ err = phonet_route_add(dev, dst);
+ else
+ err = phonet_route_del(dev, dst);
+ if (!err)
+ rtm_phonet_notify(nlh->nlmsg_type, dev, dst);
+ return err;
+}
+
+static int route_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct net *net = sock_net(skb->sk);
+ u8 addr, addr_idx = 0, addr_start_idx = cb->args[0];
+
+ for (addr = 0; addr < 64; addr++) {
+ struct net_device *dev;
+
+ dev = phonet_route_get(net, addr << 2);
+ if (!dev)
+ continue;
+
+ if (addr_idx++ < addr_start_idx)
+ continue;
+ if (fill_route(skb, dev, addr << 2, NETLINK_CB(cb->skb).pid,
+ cb->nlh->nlmsg_seq, RTM_NEWROUTE))
+ goto out;
+ }
+
+out:
+ cb->args[0] = addr_idx;
+ cb->args[1] = 0;
+
+ return skb->len;
+}
+
int __init phonet_netlink_register(void)
{
int err = __rtnl_register(PF_PHONET, RTM_NEWADDR, addr_doit, NULL);
@@ -169,5 +296,8 @@ int __init phonet_netlink_register(void)
/* Further __rtnl_register() cannot fail */
__rtnl_register(PF_PHONET, RTM_DELADDR, addr_doit, NULL);
__rtnl_register(PF_PHONET, RTM_GETADDR, NULL, getaddr_dumpit);
+ __rtnl_register(PF_PHONET, RTM_NEWROUTE, route_doit, NULL);
+ __rtnl_register(PF_PHONET, RTM_DELROUTE, route_doit, NULL);
+ __rtnl_register(PF_PHONET, RTM_GETROUTE, NULL, route_dumpit);
return 0;
}
diff --git a/net/phonet/socket.c b/net/phonet/socket.c
index aa5b5a972bff..0412beb59a05 100644
--- a/net/phonet/socket.c
+++ b/net/phonet/socket.c
@@ -94,7 +94,30 @@ struct sock *pn_find_sock_by_sa(struct net *net, const struct sockaddr_pn *spn)
spin_unlock_bh(&pnsocks.lock);
return rval;
+}
+
+/* Deliver a broadcast packet (only in bottom-half) */
+void pn_deliver_sock_broadcast(struct net *net, struct sk_buff *skb)
+{
+ struct hlist_node *node;
+ struct sock *sknode;
+
+ spin_lock(&pnsocks.lock);
+ sk_for_each(sknode, node, &pnsocks.hlist) {
+ struct sk_buff *clone;
+ if (!net_eq(sock_net(sknode), net))
+ continue;
+ if (!sock_flag(sknode, SOCK_BROADCAST))
+ continue;
+
+ clone = skb_clone(skb, GFP_ATOMIC);
+ if (clone) {
+ sock_hold(sknode);
+ sk_receive_skb(sknode, clone, 0);
+ }
+ }
+ spin_unlock(&pnsocks.lock);
}
void pn_sock_hash(struct sock *sk)
generated by cgit v1.2.3 (git 2.25.1) at 2025-03-30 11:48:43 +0000