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can: network namespace support for CAN gateway 

The CAN gateway was not implemented as per-net in the initial network
namespace support by Mario Kicherer (8e8cda6d73).
This patch enables the CAN gateway to be used in different namespaces.

Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Oliver Hartkopp 2017-04-25 08:19:43 +02:00 коммит произвёл Marc Kleine-Budde
Родитель 384317ef41
Коммит 1ef83310b8
2 изменённых файлов: 47 добавлений и 28 удалений
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3
include/net/netns/can.h
Просмотреть файл

@ -32,6 +32,9 @@ struct netns_can {
struct timer_list can_stattimer;/* timer for statistics update */
struct s_stats *can_stats; /* packet statistics */
struct s_pstats *can_pstats; /* receive list statistics */
/* CAN GW per-net gateway jobs */
struct hlist_head cgw_list;
};
#endif /* __NETNS_CAN_H__ */

72
net/can/gw.c
Просмотреть файл

@ -1,7 +1,7 @@
/*
* gw.c - CAN frame Gateway/Router/Bridge with netlink interface
*
* Copyright (c) 2011 Volkswagen Group Electronic Research
* Copyright (c) 2017 Volkswagen Group Electronic Research
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@ -59,7 +59,7 @@
#include <net/net_namespace.h>
#include <net/sock.h>
#define CAN_GW_VERSION "20130117"
#define CAN_GW_VERSION "20170425"
#define CAN_GW_NAME "can-gw"
MODULE_DESCRIPTION("PF_CAN netlink gateway");
@ -79,9 +79,7 @@ MODULE_PARM_DESC(max_hops,
__stringify(CGW_MAX_HOPS) " hops, "
"default: " __stringify(CGW_DEFAULT_HOPS) ")");
static HLIST_HEAD(cgw_list);
static struct notifier_block notifier;
static struct kmem_cache *cgw_cache __read_mostly;
/* structure that contains the (on-the-fly) CAN frame modifications */
@ -438,16 +436,16 @@ static void can_can_gw_rcv(struct sk_buff *skb, void *data)
gwj->handled_frames++;
}
static inline int cgw_register_filter(struct cgw_job *gwj)
static inline int cgw_register_filter(struct net *net, struct cgw_job *gwj)
{
return can_rx_register(&init_net, gwj->src.dev, gwj->ccgw.filter.can_id,
return can_rx_register(net, gwj->src.dev, gwj->ccgw.filter.can_id,
gwj->ccgw.filter.can_mask, can_can_gw_rcv,
gwj, "gw", NULL);
}
static inline void cgw_unregister_filter(struct cgw_job *gwj)
static inline void cgw_unregister_filter(struct net *net, struct cgw_job *gwj)
{
can_rx_unregister(&init_net, gwj->src.dev, gwj->ccgw.filter.can_id,
can_rx_unregister(net, gwj->src.dev, gwj->ccgw.filter.can_id,
gwj->ccgw.filter.can_mask, can_can_gw_rcv, gwj);
}
@ -455,9 +453,8 @@ static int cgw_notifier(struct notifier_block *nb,
unsigned long msg, void *ptr)
{
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
struct net *net = dev_net(dev);
if (!net_eq(dev_net(dev), &init_net))
return NOTIFY_DONE;
if (dev->type != ARPHRD_CAN)
return NOTIFY_DONE;
@ -468,11 +465,11 @@ static int cgw_notifier(struct notifier_block *nb,
ASSERT_RTNL();
hlist_for_each_entry_safe(gwj, nx, &cgw_list, list) {
hlist_for_each_entry_safe(gwj, nx, &net->can.cgw_list, list) {
if (gwj->src.dev == dev || gwj->dst.dev == dev) {
hlist_del(&gwj->list);
cgw_unregister_filter(gwj);
cgw_unregister_filter(net, gwj);
kmem_cache_free(cgw_cache, gwj);
}
}
@ -592,12 +589,13 @@ cancel:
/* Dump information about all CAN gateway jobs, in response to RTM_GETROUTE */
static int cgw_dump_jobs(struct sk_buff *skb, struct netlink_callback *cb)
{
struct net *net = sock_net(skb->sk);
struct cgw_job *gwj = NULL;
int idx = 0;
int s_idx = cb->args[0];
rcu_read_lock();
hlist_for_each_entry_rcu(gwj, &cgw_list, list) {
hlist_for_each_entry_rcu(gwj, &net->can.cgw_list, list) {
if (idx < s_idx)
goto cont;
@ -812,6 +810,7 @@ static int cgw_parse_attr(struct nlmsghdr *nlh, struct cf_mod *mod,
static int cgw_create_job(struct sk_buff *skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
struct net *net = sock_net(skb->sk);
struct rtcanmsg *r;
struct cgw_job *gwj;
struct cf_mod mod;
@ -842,7 +841,7 @@ static int cgw_create_job(struct sk_buff *skb, struct nlmsghdr *nlh,
ASSERT_RTNL();
/* check for updating an existing job with identical uid */
hlist_for_each_entry(gwj, &cgw_list, list) {
hlist_for_each_entry(gwj, &net->can.cgw_list, list) {
if (gwj->mod.uid != mod.uid)
continue;
@ -880,7 +879,7 @@ static int cgw_create_job(struct sk_buff *skb, struct nlmsghdr *nlh,
err = -ENODEV;
gwj->src.dev = __dev_get_by_index(&init_net, gwj->ccgw.src_idx);
gwj->src.dev = __dev_get_by_index(net, gwj->ccgw.src_idx);
if (!gwj->src.dev)
goto out;
@ -888,7 +887,7 @@ static int cgw_create_job(struct sk_buff *skb, struct nlmsghdr *nlh,
if (gwj->src.dev->type != ARPHRD_CAN)
goto out;
gwj->dst.dev = __dev_get_by_index(&init_net, gwj->ccgw.dst_idx);
gwj->dst.dev = __dev_get_by_index(net, gwj->ccgw.dst_idx);
if (!gwj->dst.dev)
goto out;
@ -898,9 +897,9 @@ static int cgw_create_job(struct sk_buff *skb, struct nlmsghdr *nlh,
ASSERT_RTNL();
err = cgw_register_filter(gwj);
err = cgw_register_filter(net, gwj);
if (!err)
hlist_add_head_rcu(&gwj->list, &cgw_list);
hlist_add_head_rcu(&gwj->list, &net->can.cgw_list);
out:
if (err)
kmem_cache_free(cgw_cache, gwj);
@ -908,16 +907,16 @@ out:
return err;
}
static void cgw_remove_all_jobs(void)
static void cgw_remove_all_jobs(struct net *net)
{
struct cgw_job *gwj = NULL;
struct hlist_node *nx;
ASSERT_RTNL();
hlist_for_each_entry_safe(gwj, nx, &cgw_list, list) {
hlist_for_each_entry_safe(gwj, nx, &net->can.cgw_list, list) {
hlist_del(&gwj->list);
cgw_unregister_filter(gwj);
cgw_unregister_filter(net, gwj);
kmem_cache_free(cgw_cache, gwj);
}
}
@ -925,6 +924,7 @@ static void cgw_remove_all_jobs(void)
static int cgw_remove_job(struct sk_buff *skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
struct net *net = sock_net(skb->sk);
struct cgw_job *gwj = NULL;
struct hlist_node *nx;
struct rtcanmsg *r;
@ -953,7 +953,7 @@ static int cgw_remove_job(struct sk_buff *skb, struct nlmsghdr *nlh,
/* two interface indices both set to 0 => remove all entries */
if (!ccgw.src_idx && !ccgw.dst_idx) {
cgw_remove_all_jobs();
cgw_remove_all_jobs(net);
return 0;
}
@ -962,7 +962,7 @@ static int cgw_remove_job(struct sk_buff *skb, struct nlmsghdr *nlh,
ASSERT_RTNL();
/* remove only the first matching entry */
hlist_for_each_entry_safe(gwj, nx, &cgw_list, list) {
hlist_for_each_entry_safe(gwj, nx, &net->can.cgw_list, list) {
if (gwj->flags != r->flags)
continue;
@ -985,7 +985,7 @@ static int cgw_remove_job(struct sk_buff *skb, struct nlmsghdr *nlh,
continue;
hlist_del(&gwj->list);
cgw_unregister_filter(gwj);
cgw_unregister_filter(net, gwj);
kmem_cache_free(cgw_cache, gwj);
err = 0;
break;
@ -994,6 +994,24 @@ static int cgw_remove_job(struct sk_buff *skb, struct nlmsghdr *nlh,
return err;
}
static int __net_init cangw_pernet_init(struct net *net)
{
INIT_HLIST_HEAD(&net->can.cgw_list);
return 0;
}
static void __net_exit cangw_pernet_exit(struct net *net)
{
rtnl_lock();
cgw_remove_all_jobs(net);
rtnl_unlock();
}
static struct pernet_operations cangw_pernet_ops = {
.init = cangw_pernet_init,
.exit = cangw_pernet_exit,
};
static __init int cgw_module_init(void)
{
/* sanitize given module parameter */
@ -1002,6 +1020,7 @@ static __init int cgw_module_init(void)
pr_info("can: netlink gateway (rev " CAN_GW_VERSION ") max_hops=%d\n",
max_hops);
register_pernet_subsys(&cangw_pernet_ops);
cgw_cache = kmem_cache_create("can_gw", sizeof(struct cgw_job),
0, 0, NULL);
@ -1031,10 +1050,7 @@ static __exit void cgw_module_exit(void)
unregister_netdevice_notifier(&notifier);
rtnl_lock();
cgw_remove_all_jobs();
rtnl_unlock();
unregister_pernet_subsys(&cangw_pernet_ops);
rcu_barrier(); /* Wait for completion of call_rcu()'s */
kmem_cache_destroy(cgw_cache);