From 384317ef4187f59a1cb7a6163444d757340b3bb4 Mon Sep 17 00:00:00 2001 From: Oliver Hartkopp Date: Tue, 25 Apr 2017 08:19:42 +0200 Subject: [PATCH] can: network namespace support for CAN_BCM protocol The CAN_BCM protocol and its procfs entries were not implemented as per-net in the initial network namespace support by Mario Kicherer (8e8cda6d737d). This patch adds the missing per-net functionality for the CAN BCM. Signed-off-by: Oliver Hartkopp Signed-off-by: Marc Kleine-Budde --- include/net/netns/can.h | 1 + net/can/bcm.c | 90 ++++++++++++++++++++++++++--------------- 2 files changed, 58 insertions(+), 33 deletions(-) diff --git a/include/net/netns/can.h b/include/net/netns/can.h index 574157dbc43a..0f3c31aab8a8 100644 --- a/include/net/netns/can.h +++ b/include/net/netns/can.h @@ -23,6 +23,7 @@ struct netns_can { struct proc_dir_entry *pde_rcvlist_sff; struct proc_dir_entry *pde_rcvlist_eff; struct proc_dir_entry *pde_rcvlist_err; + struct proc_dir_entry *bcmproc_dir; #endif /* receive filters subscribed for 'all' CAN devices */ diff --git a/net/can/bcm.c b/net/can/bcm.c index 1976629a8463..0e855917b7e1 100644 --- a/net/can/bcm.c +++ b/net/can/bcm.c @@ -1,7 +1,7 @@ /* * bcm.c - Broadcast Manager to filter/send (cyclic) CAN content * - * Copyright (c) 2002-2016 Volkswagen Group Electronic Research + * Copyright (c) 2002-2017 Volkswagen Group Electronic Research * All rights reserved. * * Redistribution and use in source and binary forms, with or without @@ -77,7 +77,7 @@ (CAN_EFF_MASK | CAN_EFF_FLAG | CAN_RTR_FLAG) : \ (CAN_SFF_MASK | CAN_EFF_FLAG | CAN_RTR_FLAG)) -#define CAN_BCM_VERSION "20161123" +#define CAN_BCM_VERSION "20170425" MODULE_DESCRIPTION("PF_CAN broadcast manager protocol"); MODULE_LICENSE("Dual BSD/GPL"); @@ -118,8 +118,6 @@ struct bcm_op { struct net_device *rx_reg_dev; }; -static struct proc_dir_entry *proc_dir; - struct bcm_sock { struct sock sk; int bound; @@ -149,7 +147,7 @@ static inline ktime_t bcm_timeval_to_ktime(struct bcm_timeval tv) /* * procfs functions */ -static char *bcm_proc_getifname(char *result, int ifindex) +static char *bcm_proc_getifname(struct net *net, char *result, int ifindex) { struct net_device *dev; @@ -157,7 +155,7 @@ static char *bcm_proc_getifname(char *result, int ifindex) return "any"; rcu_read_lock(); - dev = dev_get_by_index_rcu(&init_net, ifindex); + dev = dev_get_by_index_rcu(net, ifindex); if (dev) strcpy(result, dev->name); else @@ -170,7 +168,8 @@ static char *bcm_proc_getifname(char *result, int ifindex) static int bcm_proc_show(struct seq_file *m, void *v) { char ifname[IFNAMSIZ]; - struct sock *sk = (struct sock *)m->private; + struct net *net = m->private; + struct sock *sk = (struct sock *)PDE_DATA(m->file->f_inode); struct bcm_sock *bo = bcm_sk(sk); struct bcm_op *op; @@ -178,7 +177,7 @@ static int bcm_proc_show(struct seq_file *m, void *v) seq_printf(m, " / sk %pK", sk); seq_printf(m, " / bo %pK", bo); seq_printf(m, " / dropped %lu", bo->dropped_usr_msgs); - seq_printf(m, " / bound %s", bcm_proc_getifname(ifname, bo->ifindex)); + seq_printf(m, " / bound %s", bcm_proc_getifname(net, ifname, bo->ifindex)); seq_printf(m, " <<<\n"); list_for_each_entry(op, &bo->rx_ops, list) { @@ -190,7 +189,7 @@ static int bcm_proc_show(struct seq_file *m, void *v) continue; seq_printf(m, "rx_op: %03X %-5s ", op->can_id, - bcm_proc_getifname(ifname, op->ifindex)); + bcm_proc_getifname(net, ifname, op->ifindex)); if (op->flags & CAN_FD_FRAME) seq_printf(m, "(%u)", op->nframes); @@ -219,7 +218,7 @@ static int bcm_proc_show(struct seq_file *m, void *v) list_for_each_entry(op, &bo->tx_ops, list) { seq_printf(m, "tx_op: %03X %s ", op->can_id, - bcm_proc_getifname(ifname, op->ifindex)); + bcm_proc_getifname(net, ifname, op->ifindex)); if (op->flags & CAN_FD_FRAME) seq_printf(m, "(%u) ", op->nframes); @@ -242,7 +241,7 @@ static int bcm_proc_show(struct seq_file *m, void *v) static int bcm_proc_open(struct inode *inode, struct file *file) { - return single_open(file, bcm_proc_show, PDE_DATA(inode)); + return single_open_net(inode, file, bcm_proc_show); } static const struct file_operations bcm_proc_fops = { @@ -267,7 +266,7 @@ static void bcm_can_tx(struct bcm_op *op) if (!op->ifindex) return; - dev = dev_get_by_index(&init_net, op->ifindex); + dev = dev_get_by_index(sock_net(op->sk), op->ifindex); if (!dev) { /* RFC: should this bcm_op remove itself here? */ return; @@ -764,7 +763,7 @@ static void bcm_remove_op(struct bcm_op *op) static void bcm_rx_unreg(struct net_device *dev, struct bcm_op *op) { if (op->rx_reg_dev == dev) { - can_rx_unregister(&init_net, dev, op->can_id, + can_rx_unregister(dev_net(dev), dev, op->can_id, REGMASK(op->can_id), bcm_rx_handler, op); /* mark as removed subscription */ @@ -800,7 +799,7 @@ static int bcm_delete_rx_op(struct list_head *ops, struct bcm_msg_head *mh, if (op->rx_reg_dev) { struct net_device *dev; - dev = dev_get_by_index(&init_net, + dev = dev_get_by_index(sock_net(op->sk), op->ifindex); if (dev) { bcm_rx_unreg(dev, op); @@ -808,7 +807,8 @@ static int bcm_delete_rx_op(struct list_head *ops, struct bcm_msg_head *mh, } } } else - can_rx_unregister(&init_net, NULL, op->can_id, + can_rx_unregister(sock_net(op->sk), NULL, + op->can_id, REGMASK(op->can_id), bcm_rx_handler, op); @@ -1220,9 +1220,9 @@ static int bcm_rx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, if (ifindex) { struct net_device *dev; - dev = dev_get_by_index(&init_net, ifindex); + dev = dev_get_by_index(sock_net(sk), ifindex); if (dev) { - err = can_rx_register(&init_net, dev, + err = can_rx_register(sock_net(sk), dev, op->can_id, REGMASK(op->can_id), bcm_rx_handler, op, @@ -1233,7 +1233,7 @@ static int bcm_rx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, } } else - err = can_rx_register(&init_net, NULL, op->can_id, + err = can_rx_register(sock_net(sk), NULL, op->can_id, REGMASK(op->can_id), bcm_rx_handler, op, "bcm", sk); if (err) { @@ -1273,7 +1273,7 @@ static int bcm_tx_send(struct msghdr *msg, int ifindex, struct sock *sk, return err; } - dev = dev_get_by_index(&init_net, ifindex); + dev = dev_get_by_index(sock_net(sk), ifindex); if (!dev) { kfree_skb(skb); return -ENODEV; @@ -1338,7 +1338,7 @@ static int bcm_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) if (ifindex) { struct net_device *dev; - dev = dev_get_by_index(&init_net, ifindex); + dev = dev_get_by_index(sock_net(sk), ifindex); if (!dev) return -ENODEV; @@ -1419,7 +1419,7 @@ static int bcm_notifier(struct notifier_block *nb, unsigned long msg, struct bcm_op *op; int notify_enodev = 0; - if (!net_eq(dev_net(dev), &init_net)) + if (!net_eq(dev_net(dev), sock_net(sk))) return NOTIFY_DONE; if (dev->type != ARPHRD_CAN) @@ -1491,6 +1491,7 @@ static int bcm_init(struct sock *sk) static int bcm_release(struct socket *sock) { struct sock *sk = sock->sk; + struct net *net = sock_net(sk); struct bcm_sock *bo; struct bcm_op *op, *next; @@ -1522,14 +1523,14 @@ static int bcm_release(struct socket *sock) if (op->rx_reg_dev) { struct net_device *dev; - dev = dev_get_by_index(&init_net, op->ifindex); + dev = dev_get_by_index(net, op->ifindex); if (dev) { bcm_rx_unreg(dev, op); dev_put(dev); } } } else - can_rx_unregister(&init_net, NULL, op->can_id, + can_rx_unregister(net, NULL, op->can_id, REGMASK(op->can_id), bcm_rx_handler, op); @@ -1537,8 +1538,8 @@ static int bcm_release(struct socket *sock) } /* remove procfs entry */ - if (proc_dir && bo->bcm_proc_read) - remove_proc_entry(bo->procname, proc_dir); + if (net->can.bcmproc_dir && bo->bcm_proc_read) + remove_proc_entry(bo->procname, net->can.bcmproc_dir); /* remove device reference */ if (bo->bound) { @@ -1561,6 +1562,7 @@ static int bcm_connect(struct socket *sock, struct sockaddr *uaddr, int len, struct sockaddr_can *addr = (struct sockaddr_can *)uaddr; struct sock *sk = sock->sk; struct bcm_sock *bo = bcm_sk(sk); + struct net *net = sock_net(sk); int ret = 0; if (len < sizeof(*addr)) @@ -1577,7 +1579,7 @@ static int bcm_connect(struct socket *sock, struct sockaddr *uaddr, int len, if (addr->can_ifindex) { struct net_device *dev; - dev = dev_get_by_index(&init_net, addr->can_ifindex); + dev = dev_get_by_index(net, addr->can_ifindex); if (!dev) { ret = -ENODEV; goto fail; @@ -1596,11 +1598,11 @@ static int bcm_connect(struct socket *sock, struct sockaddr *uaddr, int len, bo->ifindex = 0; } - if (proc_dir) { + if (net->can.bcmproc_dir) { /* unique socket address as filename */ sprintf(bo->procname, "%lu", sock_i_ino(sk)); bo->bcm_proc_read = proc_create_data(bo->procname, 0644, - proc_dir, + net->can.bcmproc_dir, &bcm_proc_fops, sk); if (!bo->bcm_proc_read) { ret = -ENOMEM; @@ -1687,6 +1689,31 @@ static const struct can_proto bcm_can_proto = { .prot = &bcm_proto, }; +static int canbcm_pernet_init(struct net *net) +{ + /* create /proc/net/can-bcm directory */ + if (IS_ENABLED(CONFIG_PROC_FS)) { + net->can.bcmproc_dir = + proc_net_mkdir(net, "can-bcm", net->proc_net); + } + + return 0; +} + +static void canbcm_pernet_exit(struct net *net) +{ + /* remove /proc/net/can-bcm directory */ + if (IS_ENABLED(CONFIG_PROC_FS)) { + if (net->can.bcmproc_dir) + remove_proc_entry("can-bcm", net->proc_net); + } +} + +static struct pernet_operations canbcm_pernet_ops __read_mostly = { + .init = canbcm_pernet_init, + .exit = canbcm_pernet_exit, +}; + static int __init bcm_module_init(void) { int err; @@ -1699,17 +1726,14 @@ static int __init bcm_module_init(void) return err; } - /* create /proc/net/can-bcm directory */ - proc_dir = proc_mkdir("can-bcm", init_net.proc_net); + register_pernet_subsys(&canbcm_pernet_ops); return 0; } static void __exit bcm_module_exit(void) { can_proto_unregister(&bcm_can_proto); - - if (proc_dir) - remove_proc_entry("can-bcm", init_net.proc_net); + unregister_pernet_subsys(&canbcm_pernet_ops); } module_init(bcm_module_init);