diff options
Diffstat (limited to 'net/can')
| -rw-r--r-- | net/can/Kconfig | 20 | ||||
| -rw-r--r-- | net/can/Makefile | 9 | ||||
| -rw-r--r-- | net/can/af_can.c | 525 | ||||
| -rw-r--r-- | net/can/af_can.h | 24 | ||||
| -rw-r--r-- | net/can/bcm.c | 631 | ||||
| -rw-r--r-- | net/can/gw.c | 997 | ||||
| -rw-r--r-- | net/can/proc.c | 417 | ||||
| -rw-r--r-- | net/can/raw.c | 181 |
8 files changed, 2061 insertions, 743 deletions
diff --git a/net/can/Kconfig b/net/can/Kconfig index 89395b2c8bc..a15c0e0d1fc 100644 --- a/net/can/Kconfig +++ b/net/can/Kconfig @@ -16,10 +16,11 @@ menuconfig CAN If you want CAN support you should say Y here and also to the specific driver for your controller(s) below. +if CAN + config CAN_RAW tristate "Raw CAN Protocol (raw access with CAN-ID filtering)" - depends on CAN - default N + default y ---help--- The raw CAN protocol option offers access to the CAN bus via the BSD socket API. You probably want to use the raw socket in @@ -29,8 +30,7 @@ config CAN_RAW config CAN_BCM tristate "Broadcast Manager CAN Protocol (with content filtering)" - depends on CAN - default N + default y ---help--- The Broadcast Manager offers content filtering, timeout monitoring, sending of RTR frames, and cyclic CAN messages without permanent user @@ -40,5 +40,17 @@ config CAN_BCM CAN messages are used on the bus (e.g. in automotive environments). To use the Broadcast Manager, use AF_CAN with protocol CAN_BCM. +config CAN_GW + tristate "CAN Gateway/Router (with netlink configuration)" + default y + ---help--- + The CAN Gateway/Router is used to route (and modify) CAN frames. + It is based on the PF_CAN core infrastructure for msg filtering and + msg sending and can optionally modify routed CAN frames on the fly. + CAN frames can be routed between CAN network interfaces (one hop). + They can be modified with AND/OR/XOR/SET operations as configured + by the netlink configuration interface known e.g. from iptables. source "drivers/net/can/Kconfig" + +endif diff --git a/net/can/Makefile b/net/can/Makefile index 9cd3c4b3abd..cef49eb1f5c 100644 --- a/net/can/Makefile +++ b/net/can/Makefile @@ -3,10 +3,13 @@ # obj-$(CONFIG_CAN) += can.o -can-objs := af_can.o proc.o +can-y := af_can.o proc.o obj-$(CONFIG_CAN_RAW) += can-raw.o -can-raw-objs := raw.o +can-raw-y := raw.o obj-$(CONFIG_CAN_BCM) += can-bcm.o -can-bcm-objs := bcm.o +can-bcm-y := bcm.o + +obj-$(CONFIG_CAN_GW) += can-gw.o +can-gw-y := gw.o diff --git a/net/can/af_can.c b/net/can/af_can.c index 36b9f22ed83..ce82337521f 100644 --- a/net/can/af_can.c +++ b/net/can/af_can.c @@ -38,11 +38,10 @@ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH * DAMAGE. * - * Send feedback to <socketcan-users@lists.berlios.de> - * */ #include <linux/module.h> +#include <linux/stddef.h> #include <linux/init.h> #include <linux/kmod.h> #include <linux/slab.h> @@ -58,12 +57,14 @@ #include <linux/skbuff.h> #include <linux/can.h> #include <linux/can/core.h> +#include <linux/can/skb.h> +#include <linux/ratelimit.h> #include <net/net_namespace.h> #include <net/sock.h> #include "af_can.h" -static __initdata const char banner[] = KERN_INFO +static __initconst const char banner[] = KERN_INFO "can: controller area network core (" CAN_VERSION_STRING ")\n"; MODULE_DESCRIPTION("Controller Area Network PF_CAN core"); @@ -77,15 +78,15 @@ static int stats_timer __read_mostly = 1; module_param(stats_timer, int, S_IRUGO); MODULE_PARM_DESC(stats_timer, "enable timer for statistics (default:on)"); -HLIST_HEAD(can_rx_dev_list); -static struct dev_rcv_lists can_rx_alldev_list; +/* receive filters subscribed for 'all' CAN devices */ +struct dev_rcv_lists can_rx_alldev_list; static DEFINE_SPINLOCK(can_rcvlists_lock); static struct kmem_cache *rcv_cache __read_mostly; /* table of registered CAN protocols */ -static struct can_proto *proto_tab[CAN_NPROTO] __read_mostly; -static DEFINE_SPINLOCK(proto_tab_lock); +static const struct can_proto *proto_tab[CAN_NPROTO] __read_mostly; +static DEFINE_MUTEX(proto_tab_lock); struct timer_list can_stattimer; /* timer for statistics update */ struct s_stats can_stats; /* packet statistics */ @@ -95,7 +96,7 @@ struct s_pstats can_pstats; /* receive list statistics */ * af_can socket functions */ -static int can_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) +int can_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) { struct sock *sk = sock->sk; @@ -108,16 +109,36 @@ static int can_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) return -ENOIOCTLCMD; } } +EXPORT_SYMBOL(can_ioctl); static void can_sock_destruct(struct sock *sk) { skb_queue_purge(&sk->sk_receive_queue); } -static int can_create(struct net *net, struct socket *sock, int protocol) +static const struct can_proto *can_get_proto(int protocol) +{ + const struct can_proto *cp; + + rcu_read_lock(); + cp = rcu_dereference(proto_tab[protocol]); + if (cp && !try_module_get(cp->prot->owner)) + cp = NULL; + rcu_read_unlock(); + + return cp; +} + +static inline void can_put_proto(const struct can_proto *cp) +{ + module_put(cp->prot->owner); +} + +static int can_create(struct net *net, struct socket *sock, int protocol, + int kern) { struct sock *sk; - struct can_proto *cp; + const struct can_proto *cp; int err = 0; sock->state = SS_UNCONNECTED; @@ -125,12 +146,15 @@ static int can_create(struct net *net, struct socket *sock, int protocol) if (protocol < 0 || protocol >= CAN_NPROTO) return -EINVAL; - if (net != &init_net) + if (!net_eq(net, &init_net)) return -EAFNOSUPPORT; -#ifdef CONFIG_KMOD - /* try to load protocol module, when CONFIG_KMOD is defined */ - if (!proto_tab[protocol]) { + cp = can_get_proto(protocol); + +#ifdef CONFIG_MODULES + if (!cp) { + /* try to load protocol module if kernel is modular */ + err = request_module("can-proto-%d", protocol); /* @@ -138,30 +162,21 @@ static int can_create(struct net *net, struct socket *sock, int protocol) * return the error code immediately. Below we will * return -EPROTONOSUPPORT */ - if (err && printk_ratelimit()) - printk(KERN_ERR "can: request_module " + if (err) + printk_ratelimited(KERN_ERR "can: request_module " "(can-proto-%d) failed.\n", protocol); + + cp = can_get_proto(protocol); } #endif - spin_lock(&proto_tab_lock); - cp = proto_tab[protocol]; - if (cp && !try_module_get(cp->prot->owner)) - cp = NULL; - spin_unlock(&proto_tab_lock); - /* check for available protocol and correct usage */ if (!cp) return -EPROTONOSUPPORT; if (cp->type != sock->type) { - err = -EPROTONOSUPPORT; - goto errout; - } - - if (cp->capability >= 0 && !capable(cp->capability)) { - err = -EPERM; + err = -EPROTOTYPE; goto errout; } @@ -186,7 +201,7 @@ static int can_create(struct net *net, struct socket *sock, int protocol) } errout: - module_put(cp->prot->owner); + can_put_proto(cp); return err; } @@ -199,28 +214,54 @@ static int can_create(struct net *net, struct socket *sock, int protocol) * @skb: pointer to socket buffer with CAN frame in data section * @loop: loopback for listeners on local CAN sockets (recommended default!) * + * Due to the loopback this routine must not be called from hardirq context. + * * Return: * 0 on success * -ENETDOWN when the selected interface is down * -ENOBUFS on full driver queue (see net_xmit_errno()) * -ENOMEM when local loopback failed at calling skb_clone() * -EPERM when trying to send on a non-CAN interface + * -EMSGSIZE CAN frame size is bigger than CAN interface MTU + * -EINVAL when the skb->data does not contain a valid CAN frame */ int can_send(struct sk_buff *skb, int loop) { - int err; + struct sk_buff *newskb = NULL; + struct canfd_frame *cfd = (struct canfd_frame *)skb->data; + int err = -EINVAL; + + if (skb->len == CAN_MTU) { + skb->protocol = htons(ETH_P_CAN); + if (unlikely(cfd->len > CAN_MAX_DLEN)) + goto inval_skb; + } else if (skb->len == CANFD_MTU) { + skb->protocol = htons(ETH_P_CANFD); + if (unlikely(cfd->len > CANFD_MAX_DLEN)) + goto inval_skb; + } else + goto inval_skb; - if (skb->dev->type != ARPHRD_CAN) { - kfree_skb(skb); - return -EPERM; + /* + * Make sure the CAN frame can pass the selected CAN netdevice. + * As structs can_frame and canfd_frame are similar, we can provide + * CAN FD frames to legacy CAN drivers as long as the length is <= 8 + */ + if (unlikely(skb->len > skb->dev->mtu && cfd->len > CAN_MAX_DLEN)) { + err = -EMSGSIZE; + goto inval_skb; } - if (!(skb->dev->flags & IFF_UP)) { - kfree_skb(skb); - return -ENETDOWN; + if (unlikely(skb->dev->type != ARPHRD_CAN)) { + err = -EPERM; + goto inval_skb; + } + + if (unlikely(!(skb->dev->flags & IFF_UP))) { + err = -ENETDOWN; + goto inval_skb; } - skb->protocol = htons(ETH_P_CAN); skb_reset_network_header(skb); skb_reset_transport_header(skb); @@ -244,17 +285,15 @@ int can_send(struct sk_buff *skb, int loop) * If the interface is not capable to do loopback * itself, we do it here. */ - struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC); - + newskb = skb_clone(skb, GFP_ATOMIC); if (!newskb) { kfree_skb(skb); return -ENOMEM; } - newskb->sk = skb->sk; + can_skb_set_owner(newskb, skb->sk); newskb->ip_summed = CHECKSUM_UNNECESSARY; newskb->pkt_type = PACKET_BROADCAST; - netif_rx(newskb); } } else { /* indication for the CAN driver: no loopback required */ @@ -266,10 +305,22 @@ int can_send(struct sk_buff *skb, int loop) if (err > 0) err = net_xmit_errno(err); + if (err) { + kfree_skb(newskb); + return err; + } + + if (newskb) + netif_rx_ni(newskb); + /* update statistics */ can_stats.tx_frames++; can_stats.tx_frames_delta++; + return 0; + +inval_skb: + kfree_skb(skb); return err; } EXPORT_SYMBOL(can_send); @@ -280,47 +331,81 @@ EXPORT_SYMBOL(can_send); static struct dev_rcv_lists *find_dev_rcv_lists(struct net_device *dev) { - struct dev_rcv_lists *d = NULL; - struct hlist_node *n; + if (!dev) + return &can_rx_alldev_list; + else + return (struct dev_rcv_lists *)dev->ml_priv; +} - /* - * find receive list for this device - * - * The hlist_for_each_entry*() macros curse through the list - * using the pointer variable n and set d to the containing - * struct in each list iteration. Therefore, after list - * iteration, d is unmodified when the list is empty, and it - * points to last list element, when the list is non-empty - * but no match in the loop body is found. I.e. d is *not* - * NULL when no match is found. We can, however, use the - * cursor variable n to decide if a match was found. - */ +/** + * effhash - hash function for 29 bit CAN identifier reduction + * @can_id: 29 bit CAN identifier + * + * Description: + * To reduce the linear traversal in one linked list of _single_ EFF CAN + * frame subscriptions the 29 bit identifier is mapped to 10 bits. + * (see CAN_EFF_RCV_HASH_BITS definition) + * + * Return: + * Hash value from 0x000 - 0x3FF ( enforced by CAN_EFF_RCV_HASH_BITS mask ) + */ +static unsigned int effhash(canid_t can_id) +{ + unsigned int hash; - hlist_for_each_entry_rcu(d, n, &can_rx_dev_list, list) { - if (d->dev == dev) - break; - } + hash = can_id; + hash ^= can_id >> CAN_EFF_RCV_HASH_BITS; + hash ^= can_id >> (2 * CAN_EFF_RCV_HASH_BITS); - return n ? d : NULL; + return hash & ((1 << CAN_EFF_RCV_HASH_BITS) - 1); } +/** + * find_rcv_list - determine optimal filterlist inside device filter struct + * @can_id: pointer to CAN identifier of a given can_filter + * @mask: pointer to CAN mask of a given can_filter + * @d: pointer to the device filter struct + * + * Description: + * Returns the optimal filterlist to reduce the filter handling in the + * receive path. This function is called by service functions that need + * to register or unregister a can_filter in the filter lists. + * + * A filter matches in general, when + * + * <received_can_id> & mask == can_id & mask + * + * so every bit set in the mask (even CAN_EFF_FLAG, CAN_RTR_FLAG) describe + * relevant bits for the filter. + * + * The filter can be inverted (CAN_INV_FILTER bit set in can_id) or it can + * filter for error messages (CAN_ERR_FLAG bit set in mask). For error msg + * frames there is a special filterlist and a special rx path filter handling. + * + * Return: + * Pointer to optimal filterlist for the given can_id/mask pair. + * Constistency checked mask. + * Reduced can_id to have a preprocessed filter compare value. + */ static struct hlist_head *find_rcv_list(canid_t *can_id, canid_t *mask, struct dev_rcv_lists *d) { canid_t inv = *can_id & CAN_INV_FILTER; /* save flag before masking */ - /* filter error frames */ + /* filter for error message frames in extra filterlist */ if (*mask & CAN_ERR_FLAG) { - /* clear CAN_ERR_FLAG in list entry */ + /* clear CAN_ERR_FLAG in filter entry */ *mask &= CAN_ERR_MASK; return &d->rx[RX_ERR]; } - /* ensure valid values in can_mask */ - if (*mask & CAN_EFF_FLAG) - *mask &= (CAN_EFF_MASK | CAN_EFF_FLAG | CAN_RTR_FLAG); - else - *mask &= (CAN_SFF_MASK | CAN_RTR_FLAG); + /* with cleared CAN_ERR_FLAG we have a simple mask/value filterpair */ + +#define CAN_EFF_RTR_FLAGS (CAN_EFF_FLAG | CAN_RTR_FLAG) + + /* ensure valid values in can_mask for 'SFF only' frame filtering */ + if ((*mask & CAN_EFF_FLAG) && !(*can_id & CAN_EFF_FLAG)) + *mask &= (CAN_SFF_MASK | CAN_EFF_RTR_FLAGS); /* reduce condition testing at receive time */ *can_id &= *mask; @@ -333,15 +418,17 @@ static struct hlist_head *find_rcv_list(canid_t *can_id, canid_t *mask, if (!(*mask)) return &d->rx[RX_ALL]; - /* use extra filterset for the subscription of exactly *ONE* can_id */ - if (*can_id & CAN_EFF_FLAG) { - if (*mask == (CAN_EFF_MASK | CAN_EFF_FLAG)) { - /* RFC: a use-case for hash-tables in the future? */ - return &d->rx[RX_EFF]; + /* extra filterlists for the subscription of a single non-RTR can_id */ + if (((*mask & CAN_EFF_RTR_FLAGS) == CAN_EFF_RTR_FLAGS) && + !(*can_id & CAN_RTR_FLAG)) { + + if (*can_id & CAN_EFF_FLAG) { + if (*mask == (CAN_EFF_MASK | CAN_EFF_RTR_FLAGS)) + return &d->rx_eff[effhash(*can_id)]; + } else { + if (*mask == (CAN_SFF_MASK | CAN_EFF_RTR_FLAGS)) + return &d->rx_sff[*can_id]; } - } else { - if (*mask == CAN_SFF_MASK) - return &d->rx_sff[*can_id]; } /* default: filter via can_id/can_mask */ @@ -355,7 +442,7 @@ static struct hlist_head *find_rcv_list(canid_t *can_id, canid_t *mask, * @mask: CAN mask (see description) * @func: callback function on filter match * @data: returned parameter for callback function - * @ident: string for calling module indentification + * @ident: string for calling module identification * * Description: * Invokes the callback function with the received sk_buff and the given @@ -364,7 +451,13 @@ static struct hlist_head *find_rcv_list(canid_t *can_id, canid_t *mask, * <received_can_id> & mask == can_id & mask * * The filter can be inverted (CAN_INV_FILTER bit set in can_id) or it can - * filter for error frames (CAN_ERR_FLAG bit set in mask). + * filter for error message frames (CAN_ERR_FLAG bit set in mask). + * + * The provided pointer to the sk_buff is guaranteed to be valid as long as + * the callback function is running. The callback function must *not* free + * the given sk_buff while processing it's task. When the given sk_buff is + * needed after the end of the callback function it must be cloned inside + * the callback function with skb_clone(). * * Return: * 0 on success @@ -382,6 +475,9 @@ int can_rx_register(struct net_device *dev, canid_t can_id, canid_t mask, /* insert new receiver (dev,canid,mask) -> (func,data) */ + if (dev && dev->type != ARPHRD_CAN) + return -ENODEV; + r = kmem_cache_alloc(rcv_cache, GFP_KERNEL); if (!r) return -ENOMEM; @@ -417,16 +513,6 @@ int can_rx_register(struct net_device *dev, canid_t can_id, canid_t mask, EXPORT_SYMBOL(can_rx_register); /* - * can_rx_delete_device - rcu callback for dev_rcv_lists structure removal - */ -static void can_rx_delete_device(struct rcu_head *rp) -{ - struct dev_rcv_lists *d = container_of(rp, struct dev_rcv_lists, rcu); - - kfree(d); -} - -/* * can_rx_delete_receiver - rcu callback for single receiver entry removal */ static void can_rx_delete_receiver(struct rcu_head *rp) @@ -452,14 +538,16 @@ void can_rx_unregister(struct net_device *dev, canid_t can_id, canid_t mask, { struct receiver *r = NULL; struct hlist_head *rl; - struct hlist_node *next; struct dev_rcv_lists *d; + if (dev && dev->type != ARPHRD_CAN) + return; + spin_lock(&can_rcvlists_lock); d = find_dev_rcv_lists(dev); if (!d) { - printk(KERN_ERR "BUG: receive list not found for " + pr_err("BUG: receive list not found for " "dev %s, id %03X, mask %03X\n", DNAME(dev), can_id, mask); goto out; @@ -473,24 +561,20 @@ void can_rx_unregister(struct net_device *dev, canid_t can_id, canid_t mask, * been registered before. */ - hlist_for_each_entry_rcu(r, next, rl, list) { - if (r->can_id == can_id && r->mask == mask - && r->func == func && r->data == data) + hlist_for_each_entry_rcu(r, rl, list) { + if (r->can_id == can_id && r->mask == mask && + r->func == func && r->data == data) break; } /* - * Check for bugs in CAN protocol implementations: - * If no matching list item was found, the list cursor variable next - * will be NULL, while r will point to the last item of the list. + * Check for bugs in CAN protocol implementations using af_can.c: + * 'r' will be NULL if no matching list item was found for removal. */ - if (!next) { - printk(KERN_ERR "BUG: receive list entry not found for " - "dev %s, id %03X, mask %03X\n", - DNAME(dev), can_id, mask); - r = NULL; - d = NULL; + if (!r) { + WARN(1, "BUG: receive list entry not found for dev %s, " + "id %03X, mask %03X\n", DNAME(dev), can_id, mask); goto out; } @@ -501,10 +585,10 @@ void can_rx_unregister(struct net_device *dev, canid_t can_id, canid_t mask, can_pstats.rcv_entries--; /* remove device structure requested by NETDEV_UNREGISTER */ - if (d->remove_on_zero_entries && !d->entries) - hlist_del_rcu(&d->list); - else - d = NULL; + if (d->remove_on_zero_entries && !d->entries) { + kfree(d); + dev->ml_priv = NULL; + } out: spin_unlock(&can_rcvlists_lock); @@ -512,28 +596,18 @@ void can_rx_unregister(struct net_device *dev, canid_t can_id, canid_t mask, /* schedule the receiver item for deletion */ if (r) call_rcu(&r->rcu, can_rx_delete_receiver); - - /* schedule the device structure for deletion */ - if (d) - call_rcu(&d->rcu, can_rx_delete_device); } EXPORT_SYMBOL(can_rx_unregister); static inline void deliver(struct sk_buff *skb, struct receiver *r) { - struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC); - - if (clone) { - clone->sk = skb->sk; - r->func(clone, r->data); - r->matches++; - } + r->func(skb, r->data); + r->matches++; } static int can_rcv_filter(struct dev_rcv_lists *d, struct sk_buff *skb) { struct receiver *r; - struct hlist_node *n; int matches = 0; struct can_frame *cf = (struct can_frame *)skb->data; canid_t can_id = cf->can_id; @@ -542,8 +616,8 @@ static int can_rcv_filter(struct dev_rcv_lists *d, struct sk_buff *skb) return 0; if (can_id & CAN_ERR_FLAG) { - /* check for error frame entries only */ - hlist_for_each_entry_rcu(r, n, &d->rx[RX_ERR], list) { + /* check for error message frame entries only */ + hlist_for_each_entry_rcu(r, &d->rx[RX_ERR], list) { if (can_id & r->mask) { deliver(skb, r); matches++; @@ -553,13 +627,13 @@ static int can_rcv_filter(struct dev_rcv_lists *d, struct sk_buff *skb) } /* check for unfiltered entries */ - hlist_for_each_entry_rcu(r, n, &d->rx[RX_ALL], list) { + hlist_for_each_entry_rcu(r, &d->rx[RX_ALL], list) { deliver(skb, r); matches++; } /* check for can_id/mask entries */ - hlist_for_each_entry_rcu(r, n, &d->rx[RX_FIL], list) { + hlist_for_each_entry_rcu(r, &d->rx[RX_FIL], list) { if ((can_id & r->mask) == r->can_id) { deliver(skb, r); matches++; @@ -567,16 +641,19 @@ static int can_rcv_filter(struct dev_rcv_lists *d, struct sk_buff *skb) } /* check for inverted can_id/mask entries */ - hlist_for_each_entry_rcu(r, n, &d->rx[RX_INV], list) { + hlist_for_each_entry_rcu(r, &d->rx[RX_INV], list) { if ((can_id & r->mask) != r->can_id) { deliver(skb, r); matches++; } } - /* check CAN_ID specific entries */ + /* check filterlists for single non-RTR can_ids */ + if (can_id & CAN_RTR_FLAG) + return matches; + if (can_id & CAN_EFF_FLAG) { - hlist_for_each_entry_rcu(r, n, &d->rx[RX_EFF], list) { + hlist_for_each_entry_rcu(r, &d->rx_eff[effhash(can_id)], list) { if (r->can_id == can_id) { deliver(skb, r); matches++; @@ -584,7 +661,7 @@ static int can_rcv_filter(struct dev_rcv_lists *d, struct sk_buff *skb) } } else { can_id &= CAN_SFF_MASK; - hlist_for_each_entry_rcu(r, n, &d->rx_sff[can_id], list) { + hlist_for_each_entry_rcu(r, &d->rx_sff[can_id], list) { deliver(skb, r); matches++; } @@ -593,17 +670,11 @@ static int can_rcv_filter(struct dev_rcv_lists *d, struct sk_buff *skb) return matches; } -static int can_rcv(struct sk_buff *skb, struct net_device *dev, - struct packet_type *pt, struct net_device *orig_dev) +static void can_receive(struct sk_buff *skb, struct net_device *dev) { struct dev_rcv_lists *d; int matches; - if (dev->type != ARPHRD_CAN || dev->nd_net != &init_net) { - kfree_skb(skb); - return 0; - } - /* update statistics */ can_stats.rx_frames++; can_stats.rx_frames_delta++; @@ -620,15 +691,61 @@ static int can_rcv(struct sk_buff *skb, struct net_device *dev, rcu_read_unlock(); - /* free the skbuff allocated by the netdevice driver */ - kfree_skb(skb); + /* consume the skbuff allocated by the netdevice driver */ + consume_skb(skb); if (matches > 0) { can_stats.matches++; can_stats.matches_delta++; } +} - return 0; +static int can_rcv(struct sk_buff *skb, struct net_device *dev, + struct packet_type *pt, struct net_device *orig_dev) +{ + struct canfd_frame *cfd = (struct canfd_frame *)skb->data; + + if (unlikely(!net_eq(dev_net(dev), &init_net))) + goto drop; + + if (WARN_ONCE(dev->type != ARPHRD_CAN || + skb->len != CAN_MTU || + cfd->len > CAN_MAX_DLEN, + "PF_CAN: dropped non conform CAN skbuf: " + "dev type %d, len %d, datalen %d\n", + dev->type, skb->len, cfd->len)) + goto drop; + + can_receive(skb, dev); + return NET_RX_SUCCESS; + +drop: + kfree_skb(skb); + return NET_RX_DROP; +} + +static int canfd_rcv(struct sk_buff *skb, struct net_device *dev, + struct packet_type *pt, struct net_device *orig_dev) +{ + struct canfd_frame *cfd = (struct canfd_frame *)skb->data; + + if (unlikely(!net_eq(dev_net(dev), &init_net))) + goto drop; + + if (WARN_ONCE(dev->type != ARPHRD_CAN || + skb->len != CANFD_MTU || + cfd->len > CANFD_MAX_DLEN, + "PF_CAN: dropped non conform CAN FD skbuf: " + "dev type %d, len %d, datalen %d\n", + dev->type, skb->len, cfd->len)) + goto drop; + + can_receive(skb, dev); + return NET_RX_SUCCESS; + +drop: + kfree_skb(skb); + return NET_RX_DROP; } /* @@ -645,14 +762,13 @@ static int can_rcv(struct sk_buff *skb, struct net_device *dev, * -EBUSY protocol already in use * -ENOBUF if proto_register() fails */ -int can_proto_register(struct can_proto *cp) +int can_proto_register(const struct can_proto *cp) { int proto = cp->protocol; int err = 0; if (proto < 0 || proto >= CAN_NPROTO) { - printk(KERN_ERR "can: protocol number %d out of range\n", - proto); + pr_err("can: protocol number %d out of range\n", proto); return -EINVAL; } @@ -660,19 +776,15 @@ int can_proto_register(struct can_proto *cp) if (err < 0) return err; - spin_lock(&proto_tab_lock); + mutex_lock(&proto_tab_lock); + if (proto_tab[proto]) { - printk(KERN_ERR "can: protocol %d already registered\n", - proto); + pr_err("can: protocol %d already registered\n", proto); err = -EBUSY; - } else { - proto_tab[proto] = cp; + } else + RCU_INIT_POINTER(proto_tab[proto], cp); - /* use generic ioctl function if not defined by module */ - if (!cp->ops->ioctl) - cp->ops->ioctl = can_ioctl; - } - spin_unlock(&proto_tab_lock); + mutex_unlock(&proto_tab_lock); if (err < 0) proto_unregister(cp->prot); @@ -685,17 +797,16 @@ EXPORT_SYMBOL(can_proto_register); * can_proto_unregister - unregister CAN transport protocol * @cp: pointer to CAN protocol structure */ -void can_proto_unregister(struct can_proto *cp) +void can_proto_unregister(const struct can_proto *cp) { int proto = cp->protocol; - spin_lock(&proto_tab_lock); - if (!proto_tab[proto]) { - printk(KERN_ERR "BUG: can: protocol %d is not registered\n", - proto); - } - proto_tab[proto] = NULL; - spin_unlock(&proto_tab_lock); + mutex_lock(&proto_tab_lock); + BUG_ON(proto_tab[proto] != cp); + RCU_INIT_POINTER(proto_tab[proto], NULL); + mutex_unlock(&proto_tab_lock); + + synchronize_rcu(); proto_unregister(cp->prot); } @@ -705,12 +816,12 @@ EXPORT_SYMBOL(can_proto_unregister); * af_can notifier to create/remove CAN netdevice specific structs */ static int can_notifier(struct notifier_block *nb, unsigned long msg, - void *data) + void *ptr) { - struct net_device *dev = (struct net_device *)data; + struct net_device *dev = netdev_notifier_info_to_dev(ptr); struct dev_rcv_lists *d; - if (dev->nd_net != &init_net) + if (!net_eq(dev_net(dev), &init_net)) return NOTIFY_DONE; if (dev->type != ARPHRD_CAN) @@ -720,48 +831,32 @@ static int can_notifier(struct notifier_block *nb, unsigned long msg, case NETDEV_REGISTER: - /* - * create new dev_rcv_lists for this device - * - * N.B. zeroing the struct is the correct initialization - * for the embedded hlist_head structs. - * Another list type, e.g. list_head, would require - * explicit initialization. - */ - + /* create new dev_rcv_lists for this device */ d = kzalloc(sizeof(*d), GFP_KERNEL); - if (!d) { - printk(KERN_ERR - "can: allocation of receive list failed\n"); + if (!d) return NOTIFY_DONE; - } - d->dev = dev; - - spin_lock(&can_rcvlists_lock); - hlist_add_head_rcu(&d->list, &can_rx_dev_list); - spin_unlock(&can_rcvlists_lock); + BUG_ON(dev->ml_priv); + dev->ml_priv = d; break; case NETDEV_UNREGISTER: spin_lock(&can_rcvlists_lock); - d = find_dev_rcv_lists(dev); + d = dev->ml_priv; if (d) { - if (d->entries) { + if (d->entries) d->remove_on_zero_entries = 1; - d = NULL; - } else - hlist_del_rcu(&d->list); + else { + kfree(d); + dev->ml_priv = NULL; + } } else - printk(KERN_ERR "can: notifier: receive list not " - "found for dev %s\n", dev->name); + pr_err("can: notifier: receive list not found for dev " + "%s\n", dev->name); spin_unlock(&can_rcvlists_lock); - if (d) - call_rcu(&d->rcu, can_rx_delete_device); - break; } @@ -773,12 +868,16 @@ static int can_notifier(struct notifier_block *nb, unsigned long msg, */ static struct packet_type can_packet __read_mostly = { - .type = __constant_htons(ETH_P_CAN), - .dev = NULL, + .type = cpu_to_be16(ETH_P_CAN), .func = can_rcv, }; -static struct net_proto_family can_family_ops __read_mostly = { +static struct packet_type canfd_packet __read_mostly = { + .type = cpu_to_be16(ETH_P_CANFD), + .func = canfd_rcv, +}; + +static const struct net_proto_family can_family_ops = { .family = PF_CAN, .create = can_create, .owner = THIS_MODULE, @@ -791,23 +890,21 @@ static struct notifier_block can_netdev_notifier __read_mostly = { static __init int can_init(void) { + /* check for correct padding to be able to use the structs similarly */ + BUILD_BUG_ON(offsetof(struct can_frame, can_dlc) != + offsetof(struct canfd_frame, len) || + offsetof(struct can_frame, data) != + offsetof(struct canfd_frame, data)); + printk(banner); + memset(&can_rx_alldev_list, 0, sizeof(can_rx_alldev_list)); + rcv_cache = kmem_cache_create("can_receiver", sizeof(struct receiver), 0, 0, NULL); if (!rcv_cache) return -ENOMEM; - /* - * Insert can_rx_alldev_list for reception on all devices. - * This struct is zero initialized which is correct for the - * embedded hlist heads, the dev pointer, and the entries counter. - */ - - spin_lock(&can_rcvlists_lock); - hlist_add_head_rcu(&can_rx_alldev_list.list, &can_rx_dev_list); - spin_unlock(&can_rcvlists_lock); - if (stats_timer) { /* the statistics are updated every second (timer triggered) */ setup_timer(&can_stattimer, can_stat_update, 0); @@ -821,33 +918,41 @@ static __init int can_init(void) sock_register(&can_family_ops); register_netdevice_notifier(&can_netdev_notifier); dev_add_pack(&can_packet); + dev_add_pack(&canfd_packet); return 0; } static __exit void can_exit(void) { - struct dev_rcv_lists *d; - struct hlist_node *n, *next; + struct net_device *dev; if (stats_timer) - del_timer(&can_stattimer); + del_timer_sync(&can_stattimer); can_remove_proc(); /* protocol unregister */ + dev_remove_pack(&canfd_packet); dev_remove_pack(&can_packet); unregister_netdevice_notifier(&can_netdev_notifier); sock_unregister(PF_CAN); - /* remove can_rx_dev_list */ - spin_lock(&can_rcvlists_lock); - hlist_del(&can_rx_alldev_list.list); - hlist_for_each_entry_safe(d, n, next, &can_rx_dev_list, list) { - hlist_del(&d->list); - kfree(d); + /* remove created dev_rcv_lists from still registered CAN devices */ + rcu_read_lock(); + for_each_netdev_rcu(&init_net, dev) { + if (dev->type == ARPHRD_CAN && dev->ml_priv) { + + struct dev_rcv_lists *d = dev->ml_priv; + + BUG_ON(d->entries); + kfree(d); + dev->ml_priv = NULL; + } } - spin_unlock(&can_rcvlists_lock); + rcu_read_unlock(); + + rcu_barrier(); /* Wait for completion of call_rcu()'s */ kmem_cache_destroy(rcv_cache); } diff --git a/net/can/af_can.h b/net/can/af_can.h index 18f91e37cc3..fca0fe9fc45 100644 --- a/net/can/af_can.h +++ b/net/can/af_can.h @@ -35,8 +35,6 @@ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH * DAMAGE. * - * Send feedback to <socketcan-users@lists.berlios.de> - * */ #ifndef AF_CAN_H @@ -61,14 +59,17 @@ struct receiver { char *ident; }; -enum { RX_ERR, RX_ALL, RX_FIL, RX_INV, RX_EFF, RX_MAX }; +#define CAN_SFF_RCV_ARRAY_SZ (1 << CAN_SFF_ID_BITS) +#define CAN_EFF_RCV_HASH_BITS 10 +#define CAN_EFF_RCV_ARRAY_SZ (1 << CAN_EFF_RCV_HASH_BITS) + +enum { RX_ERR, RX_ALL, RX_FIL, RX_INV, RX_MAX }; +/* per device receive filters linked at dev->ml_priv */ struct dev_rcv_lists { - struct hlist_node list; - struct rcu_head rcu; - struct net_device *dev; struct hlist_head rx[RX_MAX]; - struct hlist_head rx_sff[0x800]; + struct hlist_head rx_sff[CAN_SFF_RCV_ARRAY_SZ]; + struct hlist_head rx_eff[CAN_EFF_RCV_ARRAY_SZ]; int remove_on_zero_entries; int entries; }; @@ -108,10 +109,13 @@ struct s_pstats { unsigned long rcv_entries_max; }; +/* receive filters subscribed for 'all' CAN devices */ +extern struct dev_rcv_lists can_rx_alldev_list; + /* function prototypes for the CAN networklayer procfs (proc.c) */ -extern void can_init_proc(void); -extern void can_remove_proc(void); -extern void can_stat_update(unsigned long data); +void can_init_proc(void); +void can_remove_proc(void); +void can_stat_update(unsigned long data); /* structures and variables from af_can.c needed in proc.c for reading */ extern struct timer_list can_stattimer; /* timer for statistics update */ diff --git a/net/can/bcm.c b/net/can/bcm.c index bd4282dae75..dcb75c0e66c 100644 --- a/net/can/bcm.c +++ b/net/can/bcm.c @@ -37,14 +37,15 @@ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH * DAMAGE. * - * Send feedback to <socketcan-users@lists.berlios.de> - * */ #include <linux/module.h> #include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/hrtimer.h> #include <linux/list.h> #include <linux/proc_fs.h> +#include <linux/seq_file.h> #include <linux/uio.h> #include <linux/net.h> #include <linux/netdevice.h> @@ -53,26 +54,37 @@ #include <linux/skbuff.h> #include <linux/can.h> #include <linux/can/core.h> +#include <linux/can/skb.h> #include <linux/can/bcm.h> +#include <linux/slab.h> #include <net/sock.h> #include <net/net_namespace.h> +/* + * To send multiple CAN frame content within TX_SETUP or to filter + * CAN messages with multiplex index within RX_SETUP, the number of + * different filters is limited to 256 due to the one byte index value. + */ +#define MAX_NFRAMES 256 + /* use of last_frames[index].can_dlc */ #define RX_RECV 0x40 /* received data for this element */ #define RX_THR 0x80 /* element not been sent due to throttle feature */ #define BCM_CAN_DLC_MASK 0x0F /* clean private flags in can_dlc by masking */ /* get best masking value for can_rx_register() for a given single can_id */ -#define REGMASK(id) ((id & CAN_RTR_FLAG) | ((id & CAN_EFF_FLAG) ? \ - (CAN_EFF_MASK | CAN_EFF_FLAG) : CAN_SFF_MASK)) +#define REGMASK(id) ((id & CAN_EFF_FLAG) ? \ + (CAN_EFF_MASK | CAN_EFF_FLAG | CAN_RTR_FLAG) : \ + (CAN_SFF_MASK | CAN_EFF_FLAG | CAN_RTR_FLAG)) #define CAN_BCM_VERSION CAN_VERSION -static __initdata const char banner[] = KERN_INFO - "can: broadcast manager protocol (rev " CAN_BCM_VERSION ")\n"; +static __initconst const char banner[] = KERN_INFO + "can: broadcast manager protocol (rev " CAN_BCM_VERSION " t)\n"; MODULE_DESCRIPTION("PF_CAN broadcast manager protocol"); MODULE_LICENSE("Dual BSD/GPL"); MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>"); +MODULE_ALIAS("can-proto-2"); /* easy access to can_frame payload */ static inline u64 GET_U64(const struct can_frame *cp) @@ -84,16 +96,16 @@ struct bcm_op { struct list_head list; int ifindex; canid_t can_id; - int flags; - unsigned long j_ival1, j_ival2, j_lastmsg; + u32 flags; unsigned long frames_abs, frames_filtered; - struct timer_list timer, thrtimer; struct timeval ival1, ival2; - ktime_t rx_stamp; + struct hrtimer timer, thrtimer; + struct tasklet_struct tsklet, thrtsklet; + ktime_t rx_stamp, kt_ival1, kt_ival2, kt_lastmsg; int rx_ifindex; - int count; - int nframes; - int currframe; + u32 count; + u32 nframes; + u32 currframe; struct can_frame *frames; struct can_frame *last_frames; struct can_frame sframe; @@ -113,7 +125,7 @@ struct bcm_sock { struct list_head tx_ops; unsigned long dropped_usr_msgs; struct proc_dir_entry *bcm_proc_read; - char procname [9]; /* pointer printed in ASCII with \0 */ + char procname [32]; /* inode number in decimal with \0 */ }; static inline struct bcm_sock *bcm_sk(const struct sock *sk) @@ -126,73 +138,39 @@ static inline struct bcm_sock *bcm_sk(const struct sock *sk) #define MHSIZ sizeof(struct bcm_msg_head) /* - * rounded_tv2jif - calculate jiffies from timeval including optional up - * @tv: pointer to timeval - * - * Description: - * Unlike timeval_to_jiffies() provided in include/linux/jiffies.h, this - * function is intentionally more relaxed on precise timer ticks to get - * exact one jiffy for requested 1000us on a 1000HZ machine. - * This code is to be removed when upgrading to kernel hrtimer. - * - * Return: - * calculated jiffies (max: ULONG_MAX) - */ -static unsigned long rounded_tv2jif(const struct timeval *tv) -{ - unsigned long sec = tv->tv_sec; - unsigned long usec = tv->tv_usec; - unsigned long jif; - - if (sec > ULONG_MAX / HZ) - return ULONG_MAX; - - /* round up to get at least the requested time */ - usec += 1000000 / HZ - 1; - - jif = usec / (1000000 / HZ); - - if (sec * HZ > ULONG_MAX - jif) - return ULONG_MAX; - - return jif + sec * HZ; -} - -/* * procfs functions */ -static char *bcm_proc_getifname(int ifindex) +static char *bcm_proc_getifname(char *result, int ifindex) { struct net_device *dev; if (!ifindex) return "any"; - /* no usage counting */ - dev = __dev_get_by_index(&init_net, ifindex); + rcu_read_lock(); + dev = dev_get_by_index_rcu(&init_net, ifindex); if (dev) - return dev->name; + strcpy(result, dev->name); + else + strcpy(result, "???"); + rcu_read_unlock(); - return "???"; + return result; } -static int bcm_read_proc(char *page, char **start, off_t off, - int count, int *eof, void *data) +static int bcm_proc_show(struct seq_file *m, void *v) { - int len = 0; - struct sock *sk = (struct sock *)data; + char ifname[IFNAMSIZ]; + struct sock *sk = (struct sock *)m->private; struct bcm_sock *bo = bcm_sk(sk); struct bcm_op *op; - len += snprintf(page + len, PAGE_SIZE - len, ">>> socket %p", - sk->sk_socket); - len += snprintf(page + len, PAGE_SIZE - len, " / sk %p", sk); - len += snprintf(page + len, PAGE_SIZE - len, " / bo %p", bo); - len += snprintf(page + len, PAGE_SIZE - len, " / dropped %lu", - bo->dropped_usr_msgs); - len += snprintf(page + len, PAGE_SIZE - len, " / bound %s", - bcm_proc_getifname(bo->ifindex)); - len += snprintf(page + len, PAGE_SIZE - len, " <<<\n"); + seq_printf(m, ">>> socket %pK", sk->sk_socket); + 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, " <<<\n"); list_for_each_entry(op, &bo->rx_ops, list) { @@ -202,66 +180,63 @@ static int bcm_read_proc(char *page, char **start, off_t off, if (!op->frames_abs) continue; - len += snprintf(page + len, PAGE_SIZE - len, - "rx_op: %03X %-5s ", - op->can_id, bcm_proc_getifname(op->ifindex)); - len += snprintf(page + len, PAGE_SIZE - len, "[%d]%c ", - op->nframes, + seq_printf(m, "rx_op: %03X %-5s ", + op->can_id, bcm_proc_getifname(ifname, op->ifindex)); + seq_printf(m, "[%u]%c ", op->nframes, (op->flags & RX_CHECK_DLC)?'d':' '); - if (op->j_ival1) - len += snprintf(page + len, PAGE_SIZE - len, - "timeo=%ld ", op->j_ival1); + if (op->kt_ival1.tv64) + seq_printf(m, "timeo=%lld ", + (long long) + ktime_to_us(op->kt_ival1)); - if (op->j_ival2) - len += snprintf(page + len, PAGE_SIZE - len, - "thr=%ld ", op->j_ival2); + if (op->kt_ival2.tv64) + seq_printf(m, "thr=%lld ", + (long long) + ktime_to_us(op->kt_ival2)); - len += snprintf(page + len, PAGE_SIZE - len, - "# recv %ld (%ld) => reduction: ", + seq_printf(m, "# recv %ld (%ld) => reduction: ", op->frames_filtered, op->frames_abs); reduction = 100 - (op->frames_filtered * 100) / op->frames_abs; - len += snprintf(page + len, PAGE_SIZE - len, "%s%ld%%\n", + seq_printf(m, "%s%ld%%\n", (reduction == 100)?"near ":"", reduction); - - if (len > PAGE_SIZE - 200) { - /* mark output cut off */ - len += snprintf(page + len, PAGE_SIZE - len, "(..)\n"); - break; - } } list_for_each_entry(op, &bo->tx_ops, list) { - len += snprintf(page + len, PAGE_SIZE - len, - "tx_op: %03X %s [%d] ", - op->can_id, bcm_proc_getifname(op->ifindex), + seq_printf(m, "tx_op: %03X %s [%u] ", + op->can_id, + bcm_proc_getifname(ifname, op->ifindex), op->nframes); - if (op->j_ival1) - len += snprintf(page + len, PAGE_SIZE - len, "t1=%ld ", - op->j_ival1); - if (op->j_ival2) - len += snprintf(page + len, PAGE_SIZE - len, "t2=%ld ", - op->j_ival2); + if (op->kt_ival1.tv64) + seq_printf(m, "t1=%lld ", + (long long) ktime_to_us(op->kt_ival1)); - len += snprintf(page + len, PAGE_SIZE - len, "# sent %ld\n", - op->frames_abs); + if (op->kt_ival2.tv64) + seq_printf(m, "t2=%lld ", + (long long) ktime_to_us(op->kt_ival2)); - if (len > PAGE_SIZE - 100) { - /* mark output cut off */ - len += snprintf(page + len, PAGE_SIZE - len, "(..)\n"); - break; - } + seq_printf(m, "# sent %ld\n", op->frames_abs); } + seq_putc(m, '\n'); + return 0; +} - len += snprintf(page + len, PAGE_SIZE - len, "\n"); - - *eof = 1; - return len; +static int bcm_proc_open(struct inode *inode, struct file *file) +{ + return single_open(file, bcm_proc_show, PDE_DATA(inode)); } +static const struct file_operations bcm_proc_fops = { + .owner = THIS_MODULE, + .open = bcm_proc_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + /* * bcm_can_tx - send the (next) CAN frame to the appropriate CAN interface * of the given bcm tx op @@ -282,15 +257,18 @@ static void bcm_can_tx(struct bcm_op *op) return; } - skb = alloc_skb(CFSIZ, gfp_any()); + skb = alloc_skb(CFSIZ + sizeof(struct can_skb_priv), gfp_any()); if (!skb) goto out; + can_skb_reserve(skb); + can_skb_prv(skb)->ifindex = dev->ifindex; + memcpy(skb_put(skb, CFSIZ), cf, CFSIZ); /* send with loopback */ skb->dev = dev; - skb->sk = op->sk; + can_skb_set_owner(skb, op->sk); can_send(skb, 1); /* update statistics */ @@ -315,7 +293,7 @@ static void bcm_send_to_user(struct bcm_op *op, struct bcm_msg_head *head, struct can_frame *firstframe; struct sockaddr_can *addr; struct sock *sk = op->sk; - int datalen = head->nframes * CFSIZ; + unsigned int datalen = head->nframes * CFSIZ; int err; skb = alloc_skb(sizeof(*head) + datalen, gfp_any()); @@ -326,7 +304,7 @@ static void bcm_send_to_user(struct bcm_op *op, struct bcm_msg_head *head, if (head->nframes) { /* can_frames starting here */ - firstframe = (struct can_frame *) skb_tail_pointer(skb); + firstframe = (struct can_frame *)skb_tail_pointer(skb); memcpy(skb_put(skb, datalen), frames, datalen); @@ -368,18 +346,27 @@ static void bcm_send_to_user(struct bcm_op *op, struct bcm_msg_head *head, } } -/* - * bcm_tx_timeout_handler - performes cyclic CAN frame transmissions - */ -static void bcm_tx_timeout_handler(unsigned long data) +static void bcm_tx_start_timer(struct bcm_op *op) +{ + if (op->kt_ival1.tv64 && op->count) + hrtimer_start(&op->timer, + ktime_add(ktime_get(), op->kt_ival1), + HRTIMER_MODE_ABS); + else if (op->kt_ival2.tv64) + hrtimer_start(&op->timer, + ktime_add(ktime_get(), op->kt_ival2), + HRTIMER_MODE_ABS); +} + +static void bcm_tx_timeout_tsklet(unsigned long data) { struct bcm_op *op = (struct bcm_op *)data; + struct bcm_msg_head msg_head; - if (op->j_ival1 && (op->count > 0)) { + if (op->kt_ival1.tv64 && (op->count > 0)) { op->count--; if (!op->count && (op->flags & TX_COUNTEVT)) { - struct bcm_msg_head msg_head; /* create notification to user */ msg_head.opcode = TX_EXPIRED; @@ -392,24 +379,24 @@ static void bcm_tx_timeout_handler(unsigned long data) bcm_send_to_user(op, &msg_head, NULL, 0); } - } - - if (op->j_ival1 && (op->count > 0)) { + bcm_can_tx(op); - /* send (next) frame */ + } else if (op->kt_ival2.tv64) bcm_can_tx(op); - mod_timer(&op->timer, jiffies + op->j_ival1); - } else { - if (op->j_ival2) { + bcm_tx_start_timer(op); +} - /* send (next) frame */ - bcm_can_tx(op); - mod_timer(&op->timer, jiffies + op->j_ival2); - } - } +/* + * bcm_tx_timeout_handler - performs cyclic CAN frame transmissions + */ +static enum hrtimer_restart bcm_tx_timeout_handler(struct hrtimer *hrtimer) +{ + struct bcm_op *op = container_of(hrtimer, struct bcm_op, timer); - return; + tasklet_schedule(&op->tsklet); + + return HRTIMER_NORESTART; } /* @@ -419,8 +406,6 @@ static void bcm_rx_changed(struct bcm_op *op, struct can_frame *data) { struct bcm_msg_head head; - op->j_lastmsg = jiffies; - /* update statistics */ op->frames_filtered++; @@ -428,6 +413,9 @@ static void bcm_rx_changed(struct bcm_op *op, struct can_frame *data) if (op->frames_filtered > ULONG_MAX/100) op->frames_filtered = op->frames_abs = 0; + /* this element is not throttled anymore */ + data->can_dlc &= (BCM_CAN_DLC_MASK|RX_RECV); + head.opcode = RX_CHANGED; head.flags = op->flags; head.count = op->count; @@ -446,40 +434,50 @@ static void bcm_rx_changed(struct bcm_op *op, struct can_frame *data) */ static void bcm_rx_update_and_send(struct bcm_op *op, struct can_frame *lastdata, - struct can_frame *rxdata) + const struct can_frame *rxdata) { - unsigned long nexttx = op->j_lastmsg + op->j_ival2; - memcpy(lastdata, rxdata, CFSIZ); - /* mark as used */ - lastdata->can_dlc |= RX_RECV; + /* mark as used and throttled by default */ + lastdata->can_dlc |= (RX_RECV|RX_THR); - /* throttle bcm_rx_changed ? */ - if ((op->thrtimer.expires) || - ((op->j_ival2) && (nexttx > jiffies))) { - /* we are already waiting OR we have to start waiting */ - - /* mark as 'throttled' */ - lastdata->can_dlc |= RX_THR; + /* throtteling mode inactive ? */ + if (!op->kt_ival2.tv64) { + /* send RX_CHANGED to the user immediately */ + bcm_rx_changed(op, lastdata); + return; + } - if (!(op->thrtimer.expires)) { - /* start the timer only the first time */ - mod_timer(&op->thrtimer, nexttx); - } + /* with active throttling timer we are just done here */ + if (hrtimer_active(&op->thrtimer)) + return; - } else { - /* send RX_CHANGED to the user immediately */ - bcm_rx_changed(op, rxdata); + /* first receiption with enabled throttling mode */ + if (!op->kt_lastmsg.tv64) + goto rx_changed_settime; + + /* got a second frame inside a potential throttle period? */ + if (ktime_us_delta(ktime_get(), op->kt_lastmsg) < + ktime_to_us(op->kt_ival2)) { + /* do not send the saved data - only start throttle timer */ + hrtimer_start(&op->thrtimer, + ktime_add(op->kt_lastmsg, op->kt_ival2), + HRTIMER_MODE_ABS); + return; } + + /* the gap was that big, that throttling was not needed here */ +rx_changed_settime: + bcm_rx_changed(op, lastdata); + op->kt_lastmsg = ktime_get(); } /* * bcm_rx_cmp_to_index - (bit)compares the currently received data to formerly * received data stored in op->last_frames[] */ -static void bcm_rx_cmp_to_index(struct bcm_op *op, int index, - struct can_frame *rxdata) +static void bcm_rx_cmp_to_index(struct bcm_op *op, unsigned int index, + const struct can_frame *rxdata) { /* * no one uses the MSBs of can_dlc for comparation, @@ -519,18 +517,16 @@ static void bcm_rx_starttimer(struct bcm_op *op) if (op->flags & RX_NO_AUTOTIMER) return; - if (op->j_ival1) - mod_timer(&op->timer, jiffies + op->j_ival1); + if (op->kt_ival1.tv64) + hrtimer_start(&op->timer, op->kt_ival1, HRTIMER_MODE_REL); } -/* - * bcm_rx_timeout_handler - when the (cyclic) CAN frame receiption timed out - */ -static void bcm_rx_timeout_handler(unsigned long data) +static void bcm_rx_timeout_tsklet(unsigned long data) { struct bcm_op *op = (struct bcm_op *)data; struct bcm_msg_head msg_head; + /* create notification to user */ msg_head.opcode = RX_TIMEOUT; msg_head.flags = op->flags; msg_head.count = op->count; @@ -540,6 +536,17 @@ static void bcm_rx_timeout_handler(unsigned long data) msg_head.nframes = 0; bcm_send_to_user(op, &msg_head, NULL, 0); +} + +/* + * bcm_rx_timeout_handler - when the (cyclic) CAN frame receiption timed out + */ +static enum hrtimer_restart bcm_rx_timeout_handler(struct hrtimer *hrtimer) +{ + struct bcm_op *op = container_of(hrtimer, struct bcm_op, timer); + + /* schedule before NET_RX_SOFTIRQ */ + tasklet_hi_schedule(&op->tsklet); /* no restart of the timer is done here! */ @@ -548,36 +555,74 @@ static void bcm_rx_timeout_handler(unsigned long data) /* clear received can_frames to indicate 'nothing received' */ memset(op->last_frames, 0, op->nframes * CFSIZ); } + + return HRTIMER_NORESTART; } /* - * bcm_rx_thr_handler - the time for blocked content updates is over now: - * Check for throttled data and send it to the userspace + * bcm_rx_do_flush - helper for bcm_rx_thr_flush */ -static void bcm_rx_thr_handler(unsigned long data) +static inline int bcm_rx_do_flush(struct bcm_op *op, int update, + unsigned int index) { - struct bcm_op *op = (struct bcm_op *)data; - int i = 0; + if ((op->last_frames) && (op->last_frames[index].can_dlc & RX_THR)) { + if (update) + bcm_rx_changed(op, &op->last_frames[index]); + return 1; + } + return 0; +} - /* mark disabled / consumed timer */ - op->thrtimer.expires = 0; +/* + * bcm_rx_thr_flush - Check for throttled data and send it to the userspace + * + * update == 0 : just check if throttled data is available (any irq context) + * update == 1 : check and send throttled data to userspace (soft_irq context) + */ +static int bcm_rx_thr_flush(struct bcm_op *op, int update) +{ + int updated = 0; if (op->nframes > 1) { + unsigned int i; + /* for MUX filter we start at index 1 */ - for (i = 1; i < op->nframes; i++) { - if ((op->last_frames) && - (op->last_frames[i].can_dlc & RX_THR)) { - op->last_frames[i].can_dlc &= ~RX_THR; - bcm_rx_changed(op, &op->last_frames[i]); - } - } + for (i = 1; i < op->nframes; i++) + updated += bcm_rx_do_flush(op, update, i); } else { /* for RX_FILTER_ID and simple filter */ - if (op->last_frames && (op->last_frames[0].can_dlc & RX_THR)) { - op->last_frames[0].can_dlc &= ~RX_THR; - bcm_rx_changed(op, &op->last_frames[0]); - } + updated += bcm_rx_do_flush(op, update, 0); + } + + return updated; +} + +static void bcm_rx_thr_tsklet(unsigned long data) +{ + struct bcm_op *op = (struct bcm_op *)data; + + /* push the changed data to the userspace */ + bcm_rx_thr_flush(op, 1); +} + +/* + * bcm_rx_thr_handler - the time for blocked content updates is over now: + * Check for throttled data and send it to the userspace + */ +static enum hrtimer_restart bcm_rx_thr_handler(struct hrtimer *hrtimer) +{ + struct bcm_op *op = container_of(hrtimer, struct bcm_op, thrtimer); + + tasklet_schedule(&op->thrtsklet); + + if (bcm_rx_thr_flush(op, 0)) { + hrtimer_forward(hrtimer, ktime_get(), op->kt_ival2); + return HRTIMER_RESTART; + } else { + /* rearm throttle handling */ + op->kt_lastmsg = ktime_set(0, 0); + return HRTIMER_NORESTART; } } @@ -587,29 +632,21 @@ static void bcm_rx_thr_handler(unsigned long data) static void bcm_rx_handler(struct sk_buff *skb, void *data) { struct bcm_op *op = (struct bcm_op *)data; - struct can_frame rxframe; - int i; + const struct can_frame *rxframe = (struct can_frame *)skb->data; + unsigned int i; /* disable timeout */ - del_timer(&op->timer); - - if (skb->len == sizeof(rxframe)) { - memcpy(&rxframe, skb->data, sizeof(rxframe)); - /* save rx timestamp */ - op->rx_stamp = skb->tstamp; - /* save originator for recvfrom() */ - op->rx_ifindex = skb->dev->ifindex; - /* update statistics */ - op->frames_abs++; - kfree_skb(skb); + hrtimer_cancel(&op->timer); - } else { - kfree_skb(skb); + if (op->can_id != rxframe->can_id) return; - } - if (op->can_id != rxframe.can_id) - return; + /* save rx timestamp */ + op->rx_stamp = skb->tstamp; + /* save originator for recvfrom() */ + op->rx_ifindex = skb->dev->ifindex; + /* update statistics */ + op->frames_abs++; if (op->flags & RX_RTR_FRAME) { /* send reply for RTR-request (placed in op->frames[0]) */ @@ -619,16 +656,14 @@ static void bcm_rx_handler(struct sk_buff *skb, void *data) if (op->flags & RX_FILTER_ID) { /* the easiest case */ - bcm_rx_update_and_send(op, &op->last_frames[0], &rxframe); - bcm_rx_starttimer(op); - return; + bcm_rx_update_and_send(op, &op->last_frames[0], rxframe); + goto rx_starttimer; } if (op->nframes == 1) { /* simple compare with index 0 */ - bcm_rx_cmp_to_index(op, 0, &rxframe); - bcm_rx_starttimer(op); - return; + bcm_rx_cmp_to_index(op, 0, rxframe); + goto rx_starttimer; } if (op->nframes > 1) { @@ -640,15 +675,17 @@ static void bcm_rx_handler(struct sk_buff *skb, void *data) */ for (i = 1; i < op->nframes; i++) { - if ((GET_U64(&op->frames[0]) & GET_U64(&rxframe)) == + if ((GET_U64(&op->frames[0]) & GET_U64(rxframe)) == (GET_U64(&op->frames[0]) & GET_U64(&op->frames[i]))) { - bcm_rx_cmp_to_index(op, i, &rxframe); + bcm_rx_cmp_to_index(op, i, rxframe); break; } } - bcm_rx_starttimer(op); } + +rx_starttimer: + bcm_rx_starttimer(op); } /* @@ -669,8 +706,14 @@ static struct bcm_op *bcm_find_op(struct list_head *ops, canid_t can_id, static void bcm_remove_op(struct bcm_op *op) { - del_timer(&op->timer); - del_timer(&op->thrtimer); + hrtimer_cancel(&op->timer); + hrtimer_cancel(&op->thrtimer); + + if (op->tsklet.func) + tasklet_kill(&op->tsklet); + + if (op->thrtsklet.func) + tasklet_kill(&op->thrtsklet); if ((op->frames) && (op->frames != &op->sframe)) kfree(op->frames); @@ -679,8 +722,6 @@ static void bcm_remove_op(struct bcm_op *op) kfree(op->last_frames); kfree(op); - - return; } static void bcm_rx_unreg(struct net_device *dev, struct bcm_op *op) @@ -790,14 +831,15 @@ static int bcm_tx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, { struct bcm_sock *bo = bcm_sk(sk); struct bcm_op *op; - int i, err; + unsigned int i; + int err; /* we need a real device to send frames */ if (!ifindex) return -ENODEV; - /* we need at least one can_frame */ - if (msg_head->nframes < 1) + /* check nframes boundaries - we need at least one can_frame */ + if (msg_head->nframes < 1 || msg_head->nframes > MAX_NFRAMES) return -EINVAL; /* check the given can_id */ @@ -818,6 +860,10 @@ static int bcm_tx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, for (i = 0; i < msg_head->nframes; i++) { err = memcpy_fromiovec((u8 *)&op->frames[i], msg->msg_iov, CFSIZ); + + if (op->frames[i].can_dlc > 8) + err = -EINVAL; + if (err < 0) return err; @@ -850,6 +896,10 @@ static int bcm_tx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, for (i = 0; i < msg_head->nframes; i++) { err = memcpy_fromiovec((u8 *)&op->frames[i], msg->msg_iov, CFSIZ); + + if (op->frames[i].can_dlc > 8) + err = -EINVAL; + if (err < 0) { if (op->frames != &op->sframe) kfree(op->frames); @@ -871,11 +921,15 @@ static int bcm_tx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, op->ifindex = ifindex; /* initialize uninitialized (kzalloc) structure */ - setup_timer(&op->timer, bcm_tx_timeout_handler, - (unsigned long)op); + hrtimer_init(&op->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + op->timer.function = bcm_tx_timeout_handler; + + /* initialize tasklet for tx countevent notification */ + tasklet_init(&op->tsklet, bcm_tx_timeout_tsklet, + (unsigned long) op); /* currently unused in tx_ops */ - init_timer(&op->thrtimer); + hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); /* add this bcm_op to the list of the tx_ops */ list_add(&op->list, &bo->tx_ops); @@ -902,29 +956,28 @@ static int bcm_tx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, op->count = msg_head->count; op->ival1 = msg_head->ival1; op->ival2 = msg_head->ival2; - op->j_ival1 = rounded_tv2jif(&msg_head->ival1); - op->j_ival2 = rounded_tv2jif(&msg_head->ival2); + op->kt_ival1 = timeval_to_ktime(msg_head->ival1); + op->kt_ival2 = timeval_to_ktime(msg_head->ival2); /* disable an active timer due to zero values? */ - if (!op->j_ival1 && !op->j_ival2) - del_timer(&op->timer); + if (!op->kt_ival1.tv64 && !op->kt_ival2.tv64) + hrtimer_cancel(&op->timer); } - if ((op->flags & STARTTIMER) && - ((op->j_ival1 && op->count) || op->j_ival2)) { - + if (op->flags & STARTTIMER) { + hrtimer_cancel(&op->timer); /* spec: send can_frame when starting timer */ op->flags |= TX_ANNOUNCE; - - if (op->j_ival1 && (op->count > 0)) { - /* op->count-- is done in bcm_tx_timeout_handler */ - mod_timer(&op->timer, jiffies + op->j_ival1); - } else - mod_timer(&op->timer, jiffies + op->j_ival2); } - if (op->flags & TX_ANNOUNCE) + if (op->flags & TX_ANNOUNCE) { bcm_can_tx(op); + if (op->count) + op->count--; + } + + if (op->flags & STARTTIMER) + bcm_tx_start_timer(op); return msg_head->nframes * CFSIZ + MHSIZ; } @@ -947,6 +1000,10 @@ static int bcm_rx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, msg_head->nframes = 0; } + /* the first element contains the mux-mask => MAX_NFRAMES + 1 */ + if (msg_head->nframes > MAX_NFRAMES + 1) + return -EINVAL; + if ((msg_head->flags & RX_RTR_FRAME) && ((msg_head->nframes != 1) || (!(msg_head->can_id & CAN_RTR_FLAG)))) @@ -1031,16 +1088,23 @@ static int bcm_rx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, op->sk = sk; op->ifindex = ifindex; + /* ifindex for timeout events w/o previous frame reception */ + op->rx_ifindex = ifindex; + /* initialize uninitialized (kzalloc) structure */ - setup_timer(&op->timer, bcm_rx_timeout_handler, - (unsigned long)op); + hrtimer_init(&op->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + op->timer.function = bcm_rx_timeout_handler; - /* init throttle timer for RX_CHANGED */ - setup_timer(&op->thrtimer, bcm_rx_thr_handler, - (unsigned long)op); + /* initialize tasklet for rx timeout notification */ + tasklet_init(&op->tsklet, bcm_rx_timeout_tsklet, + (unsigned long) op); - /* mark disabled timer */ - op->thrtimer.expires = 0; + hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + op->thrtimer.function = bcm_rx_thr_handler; + + /* initialize tasklet for rx throttle handling */ + tasklet_init(&op->thrtsklet, bcm_rx_thr_tsklet, + (unsigned long) op); /* add this bcm_op to the list of the rx_ops */ list_add(&op->list, &bo->rx_ops); @@ -1056,8 +1120,8 @@ static int bcm_rx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, if (op->flags & RX_RTR_FRAME) { /* no timers in RTR-mode */ - del_timer(&op->thrtimer); - del_timer(&op->timer); + hrtimer_cancel(&op->thrtimer); + hrtimer_cancel(&op->timer); /* * funny feature in RX(!)_SETUP only for RTR-mode: @@ -1074,28 +1138,25 @@ static int bcm_rx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, /* set timer value */ op->ival1 = msg_head->ival1; op->ival2 = msg_head->ival2; - op->j_ival1 = rounded_tv2jif(&msg_head->ival1); - op->j_ival2 = rounded_tv2jif(&msg_head->ival2); + op->kt_ival1 = timeval_to_ktime(msg_head->ival1); + op->kt_ival2 = timeval_to_ktime(msg_head->ival2); /* disable an active timer due to zero value? */ - if (!op->j_ival1) - del_timer(&op->timer); - - /* free currently blocked msgs ? */ - if (op->thrtimer.expires) { - /* send blocked msgs hereafter */ - mod_timer(&op->thrtimer, jiffies + 2); - } + if (!op->kt_ival1.tv64) + hrtimer_cancel(&op->timer); /* - * if (op->j_ival2) is zero, no (new) throttling - * will happen. For details see functions - * bcm_rx_update_and_send() and bcm_rx_thr_handler() + * In any case cancel the throttle timer, flush + * potentially blocked msgs and reset throttle handling */ + op->kt_lastmsg = ktime_set(0, 0); + hrtimer_cancel(&op->thrtimer); + bcm_rx_thr_flush(op, 1); } - if ((op->flags & STARTTIMER) && op->j_ival1) - mod_timer(&op->timer, jiffies + op->j_ival1); + if ((op->flags & STARTTIMER) && op->kt_ival1.tv64) + hrtimer_start(&op->timer, op->kt_ival1, + HRTIMER_MODE_REL); } /* now we can register for can_ids, if we added a new bcm_op */ @@ -1142,11 +1203,12 @@ static int bcm_tx_send(struct msghdr *msg, int ifindex, struct sock *sk) if (!ifindex) return -ENODEV; - skb = alloc_skb(CFSIZ, GFP_KERNEL); - + skb = alloc_skb(CFSIZ + sizeof(struct can_skb_priv), GFP_KERNEL); if (!skb) return -ENOMEM; + can_skb_reserve(skb); + err = memcpy_fromiovec(skb_put(skb, CFSIZ), msg->msg_iov, CFSIZ); if (err < 0) { kfree_skb(skb); @@ -1159,11 +1221,15 @@ static int bcm_tx_send(struct msghdr *msg, int ifindex, struct sock *sk) return -ENODEV; } + can_skb_prv(skb)->ifindex = dev->ifindex; skb->dev = dev; - skb->sk = sk; - can_send(skb, 1); /* send with loopback */ + can_skb_set_owner(skb, sk); + err = can_send(skb, 1); /* send with loopback */ dev_put(dev); + if (err) + return err; + return CFSIZ + MHSIZ; } @@ -1182,12 +1248,18 @@ static int bcm_sendmsg(struct kiocb *iocb, struct socket *sock, if (!bo->bound) return -ENOTCONN; + /* check for valid message length from userspace */ + if (size < MHSIZ || (size - MHSIZ) % CFSIZ) + return -EINVAL; + /* check for alternative ifindex for this bcm_op */ if (!ifindex && msg->msg_name) { /* no bound device as default => check msg_name */ - struct sockaddr_can *addr = - (struct sockaddr_can *)msg->msg_name; + DECLARE_SOCKADDR(struct sockaddr_can *, addr, msg->msg_name); + + if (msg->msg_namelen < sizeof(*addr)) + return -EINVAL; if (addr->can_family != AF_CAN) return -EINVAL; @@ -1256,8 +1328,8 @@ static int bcm_sendmsg(struct kiocb *iocb, struct socket *sock, break; case TX_SEND: - /* we need at least one can_frame */ - if (msg_head.nframes < 1) + /* we need exactly one can_frame behind the msg head */ + if ((msg_head.nframes != 1) || (size != CFSIZ + MHSIZ)) ret = -EINVAL; else ret = bcm_tx_send(msg, ifindex, sk); @@ -1277,15 +1349,15 @@ static int bcm_sendmsg(struct kiocb *iocb, struct socket *sock, * notification handler for netdevice status changes */ static int bcm_notifier(struct notifier_block *nb, unsigned long msg, - void *data) + void *ptr) { - struct net_device *dev = (struct net_device *)data; + struct net_device *dev = netdev_notifier_info_to_dev(ptr); struct bcm_sock *bo = container_of(nb, struct bcm_sock, notifier); struct sock *sk = &bo->sk; struct bcm_op *op; int notify_enodev = 0; - if (dev->nd_net != &init_net) + if (!net_eq(dev_net(dev), &init_net)) return NOTIFY_DONE; if (dev->type != ARPHRD_CAN) @@ -1357,9 +1429,14 @@ static int bcm_init(struct sock *sk) static int bcm_release(struct socket *sock) { struct sock *sk = sock->sk; - struct bcm_sock *bo = bcm_sk(sk); + struct bcm_sock *bo; struct bcm_op *op, *next; + if (sk == NULL) + return 0; + + bo = bcm_sk(sk); + /* remove bcm_ops, timer, rx_unregister(), etc. */ unregister_netdevice_notifier(&bo->notifier); @@ -1407,6 +1484,9 @@ static int bcm_release(struct socket *sock) bo->ifindex = 0; } + sock_orphan(sk); + sock->sk = NULL; + release_sock(sk); sock_put(sk); @@ -1420,6 +1500,9 @@ static int bcm_connect(struct socket *sock, struct sockaddr *uaddr, int len, struct sock *sk = sock->sk; struct bcm_sock *bo = bcm_sk(sk); + if (len < sizeof(*addr)) + return -EINVAL; + if (bo->bound) return -EISCONN; @@ -1448,10 +1531,10 @@ static int bcm_connect(struct socket *sock, struct sockaddr *uaddr, int len, if (proc_dir) { /* unique socket address as filename */ - sprintf(bo->procname, "%p", sock); - bo->bcm_proc_read = create_proc_read_entry(bo->procname, 0644, - proc_dir, - bcm_read_proc, sk); + sprintf(bo->procname, "%lu", sock_i_ino(sk)); + bo->bcm_proc_read = proc_create_data(bo->procname, 0644, + proc_dir, + &bcm_proc_fops, sk); } return 0; @@ -1481,9 +1564,10 @@ static int bcm_recvmsg(struct kiocb *iocb, struct socket *sock, return err; } - sock_recv_timestamp(msg, sk, skb); + sock_recv_ts_and_drops(msg, sk, skb); if (msg->msg_name) { + __sockaddr_check_size(sizeof(struct sockaddr_can)); msg->msg_namelen = sizeof(struct sockaddr_can); memcpy(msg->msg_name, skb->cb, msg->msg_namelen); } @@ -1493,7 +1577,7 @@ static int bcm_recvmsg(struct kiocb *iocb, struct socket *sock, return size; } -static struct proto_ops bcm_ops __read_mostly = { +static const struct proto_ops bcm_ops = { .family = PF_CAN, .release = bcm_release, .bind = sock_no_bind, @@ -1502,7 +1586,7 @@ static struct proto_ops bcm_ops __read_mostly = { .accept = sock_no_accept, .getname = sock_no_getname, .poll = datagram_poll, - .ioctl = NULL, /* use can_ioctl() from af_can.c */ + .ioctl = can_ioctl, /* use can_ioctl() from af_can.c */ .listen = sock_no_listen, .shutdown = sock_no_shutdown, .setsockopt = sock_no_setsockopt, @@ -1520,10 +1604,9 @@ static struct proto bcm_proto __read_mostly = { .init = bcm_init, }; -static struct can_proto bcm_can_proto __read_mostly = { +static const struct can_proto bcm_can_proto = { .type = SOCK_DGRAM, .protocol = CAN_BCM, - .capability = -1, .ops = &bcm_ops, .prot = &bcm_proto, }; @@ -1542,10 +1625,6 @@ static int __init bcm_module_init(void) /* create /proc/net/can-bcm directory */ proc_dir = proc_mkdir("can-bcm", init_net.proc_net); - - if (proc_dir) - proc_dir->owner = THIS_MODULE; - return 0; } @@ -1554,7 +1633,7 @@ static void __exit bcm_module_exit(void) can_proto_unregister(&bcm_can_proto); if (proc_dir) - proc_net_remove(&init_net, "can-bcm"); + remove_proc_entry("can-bcm", init_net.proc_net); } module_init(bcm_module_init); diff --git a/net/can/gw.c b/net/can/gw.c new file mode 100644 index 00000000000..050a2110d43 --- /dev/null +++ b/net/can/gw.c @@ -0,0 +1,997 @@ +/* + * gw.c - CAN frame Gateway/Router/Bridge with netlink interface + * + * Copyright (c) 2011 Volkswagen Group Electronic Research + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of Volkswagen nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * Alternatively, provided that this notice is retained in full, this + * software may be distributed under the terms of the GNU General + * Public License ("GPL") version 2, in which case the provisions of the + * GPL apply INSTEAD OF those given above. + * + * The provided data structures and external interfaces from this code + * are not restricted to be used by modules with a GPL compatible license. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH + * DAMAGE. + * + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/list.h> +#include <linux/spinlock.h> +#include <linux/rcupdate.h> +#include <linux/rculist.h> +#include <linux/net.h> +#include <linux/netdevice.h> +#include <linux/if_arp.h> +#include <linux/skbuff.h> +#include <linux/can.h> +#include <linux/can/core.h> +#include <linux/can/skb.h> +#include <linux/can/gw.h> +#include <net/rtnetlink.h> +#include <net/net_namespace.h> +#include <net/sock.h> + +#define CAN_GW_VERSION "20130117" +#define CAN_GW_NAME "can-gw" + +MODULE_DESCRIPTION("PF_CAN netlink gateway"); +MODULE_LICENSE("Dual BSD/GPL"); +MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>"); +MODULE_ALIAS(CAN_GW_NAME); + +#define CGW_MIN_HOPS 1 +#define CGW_MAX_HOPS 6 +#define CGW_DEFAULT_HOPS 1 + +static unsigned int max_hops __read_mostly = CGW_DEFAULT_HOPS; +module_param(max_hops, uint, S_IRUGO); +MODULE_PARM_DESC(max_hops, + "maximum " CAN_GW_NAME " routing hops for CAN frames " + "(valid values: " __stringify(CGW_MIN_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 */ +struct cf_mod { + struct { + struct can_frame and; + struct can_frame or; + struct can_frame xor; + struct can_frame set; + } modframe; + struct { + u8 and; + u8 or; + u8 xor; + u8 set; + } modtype; + void (*modfunc[MAX_MODFUNCTIONS])(struct can_frame *cf, + struct cf_mod *mod); + + /* CAN frame checksum calculation after CAN frame modifications */ + struct { + struct cgw_csum_xor xor; + struct cgw_csum_crc8 crc8; + } csum; + struct { + void (*xor)(struct can_frame *cf, struct cgw_csum_xor *xor); + void (*crc8)(struct can_frame *cf, struct cgw_csum_crc8 *crc8); + } csumfunc; +}; + + +/* + * So far we just support CAN -> CAN routing and frame modifications. + * + * The internal can_can_gw structure contains data and attributes for + * a CAN -> CAN gateway job. + */ +struct can_can_gw { + struct can_filter filter; + int src_idx; + int dst_idx; +}; + +/* list entry for CAN gateways jobs */ +struct cgw_job { + struct hlist_node list; + struct rcu_head rcu; + u32 handled_frames; + u32 dropped_frames; + u32 deleted_frames; + struct cf_mod mod; + union { + /* CAN frame data source */ + struct net_device *dev; + } src; + union { + /* CAN frame data destination */ + struct net_device *dev; + } dst; + union { + struct can_can_gw ccgw; + /* tbc */ + }; + u8 gwtype; + u8 limit_hops; + u16 flags; +}; + +/* modification functions that are invoked in the hot path in can_can_gw_rcv */ + +#define MODFUNC(func, op) static void func(struct can_frame *cf, \ + struct cf_mod *mod) { op ; } + +MODFUNC(mod_and_id, cf->can_id &= mod->modframe.and.can_id) +MODFUNC(mod_and_dlc, cf->can_dlc &= mod->modframe.and.can_dlc) +MODFUNC(mod_and_data, *(u64 *)cf->data &= *(u64 *)mod->modframe.and.data) +MODFUNC(mod_or_id, cf->can_id |= mod->modframe.or.can_id) +MODFUNC(mod_or_dlc, cf->can_dlc |= mod->modframe.or.can_dlc) +MODFUNC(mod_or_data, *(u64 *)cf->data |= *(u64 *)mod->modframe.or.data) +MODFUNC(mod_xor_id, cf->can_id ^= mod->modframe.xor.can_id) +MODFUNC(mod_xor_dlc, cf->can_dlc ^= mod->modframe.xor.can_dlc) +MODFUNC(mod_xor_data, *(u64 *)cf->data ^= *(u64 *)mod->modframe.xor.data) +MODFUNC(mod_set_id, cf->can_id = mod->modframe.set.can_id) +MODFUNC(mod_set_dlc, cf->can_dlc = mod->modframe.set.can_dlc) +MODFUNC(mod_set_data, *(u64 *)cf->data = *(u64 *)mod->modframe.set.data) + +static inline void canframecpy(struct can_frame *dst, struct can_frame *src) +{ + /* + * Copy the struct members separately to ensure that no uninitialized + * data are copied in the 3 bytes hole of the struct. This is needed + * to make easy compares of the data in the struct cf_mod. + */ + + dst->can_id = src->can_id; + dst->can_dlc = src->can_dlc; + *(u64 *)dst->data = *(u64 *)src->data; +} + +static int cgw_chk_csum_parms(s8 fr, s8 to, s8 re) +{ + /* + * absolute dlc values 0 .. 7 => 0 .. 7, e.g. data [0] + * relative to received dlc -1 .. -8 : + * e.g. for received dlc = 8 + * -1 => index = 7 (data[7]) + * -3 => index = 5 (data[5]) + * -8 => index = 0 (data[0]) + */ + + if (fr > -9 && fr < 8 && + to > -9 && to < 8 && + re > -9 && re < 8) + return 0; + else + return -EINVAL; +} + +static inline int calc_idx(int idx, int rx_dlc) +{ + if (idx < 0) + return rx_dlc + idx; + else + return idx; +} + +static void cgw_csum_xor_rel(struct can_frame *cf, struct cgw_csum_xor *xor) +{ + int from = calc_idx(xor->from_idx, cf->can_dlc); + int to = calc_idx(xor->to_idx, cf->can_dlc); + int res = calc_idx(xor->result_idx, cf->can_dlc); + u8 val = xor->init_xor_val; + int i; + + if (from < 0 || to < 0 || res < 0) + return; + + if (from <= to) { + for (i = from; i <= to; i++) + val ^= cf->data[i]; + } else { + for (i = from; i >= to; i--) + val ^= cf->data[i]; + } + + cf->data[res] = val; +} + +static void cgw_csum_xor_pos(struct can_frame *cf, struct cgw_csum_xor *xor) +{ + u8 val = xor->init_xor_val; + int i; + + for (i = xor->from_idx; i <= xor->to_idx; i++) + val ^= cf->data[i]; + + cf->data[xor->result_idx] = val; +} + +static void cgw_csum_xor_neg(struct can_frame *cf, struct cgw_csum_xor *xor) +{ + u8 val = xor->init_xor_val; + int i; + + for (i = xor->from_idx; i >= xor->to_idx; i--) + val ^= cf->data[i]; + + cf->data[xor->result_idx] = val; +} + +static void cgw_csum_crc8_rel(struct can_frame *cf, struct cgw_csum_crc8 *crc8) +{ + int from = calc_idx(crc8->from_idx, cf->can_dlc); + int to = calc_idx(crc8->to_idx, cf->can_dlc); + int res = calc_idx(crc8->result_idx, cf->can_dlc); + u8 crc = crc8->init_crc_val; + int i; + + if (from < 0 || to < 0 || res < 0) + return; + + if (from <= to) { + for (i = crc8->from_idx; i <= crc8->to_idx; i++) + crc = crc8->crctab[crc^cf->data[i]]; + } else { + for (i = crc8->from_idx; i >= crc8->to_idx; i--) + crc = crc8->crctab[crc^cf->data[i]]; + } + + switch (crc8->profile) { + + case CGW_CRC8PRF_1U8: + crc = crc8->crctab[crc^crc8->profile_data[0]]; + break; + + case CGW_CRC8PRF_16U8: + crc = crc8->crctab[crc^crc8->profile_data[cf->data[1] & 0xF]]; + break; + + case CGW_CRC8PRF_SFFID_XOR: + crc = crc8->crctab[crc^(cf->can_id & 0xFF)^ + (cf->can_id >> 8 & 0xFF)]; + break; + + } + + cf->data[crc8->result_idx] = crc^crc8->final_xor_val; +} + +static void cgw_csum_crc8_pos(struct can_frame *cf, struct cgw_csum_crc8 *crc8) +{ + u8 crc = crc8->init_crc_val; + int i; + + for (i = crc8->from_idx; i <= crc8->to_idx; i++) + crc = crc8->crctab[crc^cf->data[i]]; + + switch (crc8->profile) { + + case CGW_CRC8PRF_1U8: + crc = crc8->crctab[crc^crc8->profile_data[0]]; + break; + + case CGW_CRC8PRF_16U8: + crc = crc8->crctab[crc^crc8->profile_data[cf->data[1] & 0xF]]; + break; + + case CGW_CRC8PRF_SFFID_XOR: + crc = crc8->crctab[crc^(cf->can_id & 0xFF)^ + (cf->can_id >> 8 & 0xFF)]; + break; + } + + cf->data[crc8->result_idx] = crc^crc8->final_xor_val; +} + +static void cgw_csum_crc8_neg(struct can_frame *cf, struct cgw_csum_crc8 *crc8) +{ + u8 crc = crc8->init_crc_val; + int i; + + for (i = crc8->from_idx; i >= crc8->to_idx; i--) + crc = crc8->crctab[crc^cf->data[i]]; + + switch (crc8->profile) { + + case CGW_CRC8PRF_1U8: + crc = crc8->crctab[crc^crc8->profile_data[0]]; + break; + + case CGW_CRC8PRF_16U8: + crc = crc8->crctab[crc^crc8->profile_data[cf->data[1] & 0xF]]; + break; + + case CGW_CRC8PRF_SFFID_XOR: + crc = crc8->crctab[crc^(cf->can_id & 0xFF)^ + (cf->can_id >> 8 & 0xFF)]; + break; + } + + cf->data[crc8->result_idx] = crc^crc8->final_xor_val; +} + +/* the receive & process & send function */ +static void can_can_gw_rcv(struct sk_buff *skb, void *data) +{ + struct cgw_job *gwj = (struct cgw_job *)data; + struct can_frame *cf; + struct sk_buff *nskb; + int modidx = 0; + + /* + * Do not handle CAN frames routed more than 'max_hops' times. + * In general we should never catch this delimiter which is intended + * to cover a misconfiguration protection (e.g. circular CAN routes). + * + * The Controller Area Network controllers only accept CAN frames with + * correct CRCs - which are not visible in the controller registers. + * According to skbuff.h documentation the csum_start element for IP + * checksums is undefined/unsued when ip_summed == CHECKSUM_UNNECESSARY. + * Only CAN skbs can be processed here which already have this property. + */ + +#define cgw_hops(skb) ((skb)->csum_start) + + BUG_ON(skb->ip_summed != CHECKSUM_UNNECESSARY); + + if (cgw_hops(skb) >= max_hops) { + /* indicate deleted frames due to misconfiguration */ + gwj->deleted_frames++; + return; + } + + if (!(gwj->dst.dev->flags & IFF_UP)) { + gwj->dropped_frames++; + return; + } + + /* is sending the skb back to the incoming interface not allowed? */ + if (!(gwj->flags & CGW_FLAGS_CAN_IIF_TX_OK) && + can_skb_prv(skb)->ifindex == gwj->dst.dev->ifindex) + return; + + /* + * clone the given skb, which has not been done in can_rcv() + * + * When there is at least one modification function activated, + * we need to copy the skb as we want to modify skb->data. + */ + if (gwj->mod.modfunc[0]) + nskb = skb_copy(skb, GFP_ATOMIC); + else + nskb = skb_clone(skb, GFP_ATOMIC); + + if (!nskb) { + gwj->dropped_frames++; + return; + } + + /* put the incremented hop counter in the cloned skb */ + cgw_hops(nskb) = cgw_hops(skb) + 1; + + /* first processing of this CAN frame -> adjust to private hop limit */ + if (gwj->limit_hops && cgw_hops(nskb) == 1) + cgw_hops(nskb) = max_hops - gwj->limit_hops + 1; + + nskb->dev = gwj->dst.dev; + + /* pointer to modifiable CAN frame */ + cf = (struct can_frame *)nskb->data; + + /* perform preprocessed modification functions if there are any */ + while (modidx < MAX_MODFUNCTIONS && gwj->mod.modfunc[modidx]) + (*gwj->mod.modfunc[modidx++])(cf, &gwj->mod); + + /* check for checksum updates when the CAN frame has been modified */ + if (modidx) { + if (gwj->mod.csumfunc.crc8) + (*gwj->mod.csumfunc.crc8)(cf, &gwj->mod.csum.crc8); + + if (gwj->mod.csumfunc.xor) + (*gwj->mod.csumfunc.xor)(cf, &gwj->mod.csum.xor); + } + + /* clear the skb timestamp if not configured the other way */ + if (!(gwj->flags & CGW_FLAGS_CAN_SRC_TSTAMP)) + nskb->tstamp.tv64 = 0; + + /* send to netdevice */ + if (can_send(nskb, gwj->flags & CGW_FLAGS_CAN_ECHO)) + gwj->dropped_frames++; + else + gwj->handled_frames++; +} + +static inline int cgw_register_filter(struct cgw_job *gwj) +{ + return can_rx_register(gwj->src.dev, gwj->ccgw.filter.can_id, + gwj->ccgw.filter.can_mask, can_can_gw_rcv, + gwj, "gw"); +} + +static inline void cgw_unregister_filter(struct cgw_job *gwj) +{ + can_rx_unregister(gwj->src.dev, gwj->ccgw.filter.can_id, + gwj->ccgw.filter.can_mask, can_can_gw_rcv, gwj); +} + +static int cgw_notifier(struct notifier_block *nb, + unsigned long msg, void *ptr) +{ + struct net_device *dev = netdev_notifier_info_to_dev(ptr); + + if (!net_eq(dev_net(dev), &init_net)) + return NOTIFY_DONE; + if (dev->type != ARPHRD_CAN) + return NOTIFY_DONE; + + if (msg == NETDEV_UNREGISTER) { + + struct cgw_job *gwj = NULL; + struct hlist_node *nx; + + ASSERT_RTNL(); + + hlist_for_each_entry_safe(gwj, nx, &cgw_list, list) { + + if (gwj->src.dev == dev || gwj->dst.dev == dev) { + hlist_del(&gwj->list); + cgw_unregister_filter(gwj); + kmem_cache_free(cgw_cache, gwj); + } + } + } + + return NOTIFY_DONE; +} + +static int cgw_put_job(struct sk_buff *skb, struct cgw_job *gwj, int type, + u32 pid, u32 seq, int flags) +{ + struct cgw_frame_mod mb; + struct rtcanmsg *rtcan; + struct nlmsghdr *nlh; + + nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtcan), flags); + if (!nlh) + return -EMSGSIZE; + + rtcan = nlmsg_data(nlh); + rtcan->can_family = AF_CAN; + rtcan->gwtype = gwj->gwtype; + rtcan->flags = gwj->flags; + + /* add statistics if available */ + + if (gwj->handled_frames) { + if (nla_put_u32(skb, CGW_HANDLED, gwj->handled_frames) < 0) + goto cancel; + } + + if (gwj->dropped_frames) { + if (nla_put_u32(skb, CGW_DROPPED, gwj->dropped_frames) < 0) + goto cancel; + } + + if (gwj->deleted_frames) { + if (nla_put_u32(skb, CGW_DELETED, gwj->deleted_frames) < 0) + goto cancel; + } + + /* check non default settings of attributes */ + + if (gwj->limit_hops) { + if (nla_put_u8(skb, CGW_LIM_HOPS, gwj->limit_hops) < 0) + goto cancel; + } + + if (gwj->mod.modtype.and) { + memcpy(&mb.cf, &gwj->mod.modframe.and, sizeof(mb.cf)); + mb.modtype = gwj->mod.modtype.and; + if (nla_put(skb, CGW_MOD_AND, sizeof(mb), &mb) < 0) + goto cancel; + } + + if (gwj->mod.modtype.or) { + memcpy(&mb.cf, &gwj->mod.modframe.or, sizeof(mb.cf)); + mb.modtype = gwj->mod.modtype.or; + if (nla_put(skb, CGW_MOD_OR, sizeof(mb), &mb) < 0) + goto cancel; + } + + if (gwj->mod.modtype.xor) { + memcpy(&mb.cf, &gwj->mod.modframe.xor, sizeof(mb.cf)); + mb.modtype = gwj->mod.modtype.xor; + if (nla_put(skb, CGW_MOD_XOR, sizeof(mb), &mb) < 0) + goto cancel; + } + + if (gwj->mod.modtype.set) { + memcpy(&mb.cf, &gwj->mod.modframe.set, sizeof(mb.cf)); + mb.modtype = gwj->mod.modtype.set; + if (nla_put(skb, CGW_MOD_SET, sizeof(mb), &mb) < 0) + goto cancel; + } + + if (gwj->mod.csumfunc.crc8) { + if (nla_put(skb, CGW_CS_CRC8, CGW_CS_CRC8_LEN, + &gwj->mod.csum.crc8) < 0) + goto cancel; + } + + if (gwj->mod.csumfunc.xor) { + if (nla_put(skb, CGW_CS_XOR, CGW_CS_XOR_LEN, + &gwj->mod.csum.xor) < 0) + goto cancel; + } + + if (gwj->gwtype == CGW_TYPE_CAN_CAN) { + + if (gwj->ccgw.filter.can_id || gwj->ccgw.filter.can_mask) { + if (nla_put(skb, CGW_FILTER, sizeof(struct can_filter), + &gwj->ccgw.filter) < 0) + goto cancel; + } + + if (nla_put_u32(skb, CGW_SRC_IF, gwj->ccgw.src_idx) < 0) + goto cancel; + + if (nla_put_u32(skb, CGW_DST_IF, gwj->ccgw.dst_idx) < 0) + goto cancel; + } + + return nlmsg_end(skb, nlh); + +cancel: + nlmsg_cancel(skb, nlh); + return -EMSGSIZE; +} + +/* 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 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) { + if (idx < s_idx) + goto cont; + + if (cgw_put_job(skb, gwj, RTM_NEWROUTE, NETLINK_CB(cb->skb).portid, + cb->nlh->nlmsg_seq, NLM_F_MULTI) < 0) + break; +cont: + idx++; + } + rcu_read_unlock(); + + cb->args[0] = idx; + + return skb->len; +} + +static const struct nla_policy cgw_policy[CGW_MAX+1] = { + [CGW_MOD_AND] = { .len = sizeof(struct cgw_frame_mod) }, + [CGW_MOD_OR] = { .len = sizeof(struct cgw_frame_mod) }, + [CGW_MOD_XOR] = { .len = sizeof(struct cgw_frame_mod) }, + [CGW_MOD_SET] = { .len = sizeof(struct cgw_frame_mod) }, + [CGW_CS_XOR] = { .len = sizeof(struct cgw_csum_xor) }, + [CGW_CS_CRC8] = { .len = sizeof(struct cgw_csum_crc8) }, + [CGW_SRC_IF] = { .type = NLA_U32 }, + [CGW_DST_IF] = { .type = NLA_U32 }, + [CGW_FILTER] = { .len = sizeof(struct can_filter) }, + [CGW_LIM_HOPS] = { .type = NLA_U8 }, +}; + +/* check for common and gwtype specific attributes */ +static int cgw_parse_attr(struct nlmsghdr *nlh, struct cf_mod *mod, + u8 gwtype, void *gwtypeattr, u8 *limhops) +{ + struct nlattr *tb[CGW_MAX+1]; + struct cgw_frame_mod mb; + int modidx = 0; + int err = 0; + + /* initialize modification & checksum data space */ + memset(mod, 0, sizeof(*mod)); + + err = nlmsg_parse(nlh, sizeof(struct rtcanmsg), tb, CGW_MAX, + cgw_policy); + if (err < 0) + return err; + + if (tb[CGW_LIM_HOPS]) { + *limhops = nla_get_u8(tb[CGW_LIM_HOPS]); + + if (*limhops < 1 || *limhops > max_hops) + return -EINVAL; + } + + /* check for AND/OR/XOR/SET modifications */ + + if (tb[CGW_MOD_AND]) { + nla_memcpy(&mb, tb[CGW_MOD_AND], CGW_MODATTR_LEN); + + canframecpy(&mod->modframe.and, &mb.cf); + mod->modtype.and = mb.modtype; + + if (mb.modtype & CGW_MOD_ID) + mod->modfunc[modidx++] = mod_and_id; + + if (mb.modtype & CGW_MOD_DLC) + mod->modfunc[modidx++] = mod_and_dlc; + + if (mb.modtype & CGW_MOD_DATA) + mod->modfunc[modidx++] = mod_and_data; + } + + if (tb[CGW_MOD_OR]) { + nla_memcpy(&mb, tb[CGW_MOD_OR], CGW_MODATTR_LEN); + + canframecpy(&mod->modframe.or, &mb.cf); + mod->modtype.or = mb.modtype; + + if (mb.modtype & CGW_MOD_ID) + mod->modfunc[modidx++] = mod_or_id; + + if (mb.modtype & CGW_MOD_DLC) + mod->modfunc[modidx++] = mod_or_dlc; + + if (mb.modtype & CGW_MOD_DATA) + mod->modfunc[modidx++] = mod_or_data; + } + + if (tb[CGW_MOD_XOR]) { + nla_memcpy(&mb, tb[CGW_MOD_XOR], CGW_MODATTR_LEN); + + canframecpy(&mod->modframe.xor, &mb.cf); + mod->modtype.xor = mb.modtype; + + if (mb.modtype & CGW_MOD_ID) + mod->modfunc[modidx++] = mod_xor_id; + + if (mb.modtype & CGW_MOD_DLC) + mod->modfunc[modidx++] = mod_xor_dlc; + + if (mb.modtype & CGW_MOD_DATA) + mod->modfunc[modidx++] = mod_xor_data; + } + + if (tb[CGW_MOD_SET]) { + nla_memcpy(&mb, tb[CGW_MOD_SET], CGW_MODATTR_LEN); + + canframecpy(&mod->modframe.set, &mb.cf); + mod->modtype.set = mb.modtype; + + if (mb.modtype & CGW_MOD_ID) + mod->modfunc[modidx++] = mod_set_id; + + if (mb.modtype & CGW_MOD_DLC) + mod->modfunc[modidx++] = mod_set_dlc; + + if (mb.modtype & CGW_MOD_DATA) + mod->modfunc[modidx++] = mod_set_data; + } + + /* check for checksum operations after CAN frame modifications */ + if (modidx) { + + if (tb[CGW_CS_CRC8]) { + struct cgw_csum_crc8 *c = nla_data(tb[CGW_CS_CRC8]); + + err = cgw_chk_csum_parms(c->from_idx, c->to_idx, + c->result_idx); + if (err) + return err; + + nla_memcpy(&mod->csum.crc8, tb[CGW_CS_CRC8], + CGW_CS_CRC8_LEN); + + /* + * select dedicated processing function to reduce + * runtime operations in receive hot path. + */ + if (c->from_idx < 0 || c->to_idx < 0 || + c->result_idx < 0) + mod->csumfunc.crc8 = cgw_csum_crc8_rel; + else if (c->from_idx <= c->to_idx) + mod->csumfunc.crc8 = cgw_csum_crc8_pos; + else + mod->csumfunc.crc8 = cgw_csum_crc8_neg; + } + + if (tb[CGW_CS_XOR]) { + struct cgw_csum_xor *c = nla_data(tb[CGW_CS_XOR]); + + err = cgw_chk_csum_parms(c->from_idx, c->to_idx, + c->result_idx); + if (err) + return err; + + nla_memcpy(&mod->csum.xor, tb[CGW_CS_XOR], + CGW_CS_XOR_LEN); + + /* + * select dedicated processing function to reduce + * runtime operations in receive hot path. + */ + if (c->from_idx < 0 || c->to_idx < 0 || + c->result_idx < 0) + mod->csumfunc.xor = cgw_csum_xor_rel; + else if (c->from_idx <= c->to_idx) + mod->csumfunc.xor = cgw_csum_xor_pos; + else + mod->csumfunc.xor = cgw_csum_xor_neg; + } + } + + if (gwtype == CGW_TYPE_CAN_CAN) { + + /* check CGW_TYPE_CAN_CAN specific attributes */ + + struct can_can_gw *ccgw = (struct can_can_gw *)gwtypeattr; + memset(ccgw, 0, sizeof(*ccgw)); + + /* check for can_filter in attributes */ + if (tb[CGW_FILTER]) + nla_memcpy(&ccgw->filter, tb[CGW_FILTER], + sizeof(struct can_filter)); + + err = -ENODEV; + + /* specifying two interfaces is mandatory */ + if (!tb[CGW_SRC_IF] || !tb[CGW_DST_IF]) + return err; + + ccgw->src_idx = nla_get_u32(tb[CGW_SRC_IF]); + ccgw->dst_idx = nla_get_u32(tb[CGW_DST_IF]); + + /* both indices set to 0 for flushing all routing entries */ + if (!ccgw->src_idx && !ccgw->dst_idx) + return 0; + + /* only one index set to 0 is an error */ + if (!ccgw->src_idx || !ccgw->dst_idx) + return err; + } + + /* add the checks for other gwtypes here */ + + return 0; +} + +static int cgw_create_job(struct sk_buff *skb, struct nlmsghdr *nlh) +{ + struct rtcanmsg *r; + struct cgw_job *gwj; + u8 limhops = 0; + int err = 0; + + if (!netlink_capable(skb, CAP_NET_ADMIN)) + return -EPERM; + + if (nlmsg_len(nlh) < sizeof(*r)) + return -EINVAL; + + r = nlmsg_data(nlh); + if (r->can_family != AF_CAN) + return -EPFNOSUPPORT; + + /* so far we only support CAN -> CAN routings */ + if (r->gwtype != CGW_TYPE_CAN_CAN) + return -EINVAL; + + gwj = kmem_cache_alloc(cgw_cache, GFP_KERNEL); + if (!gwj) + return -ENOMEM; + + gwj->handled_frames = 0; + gwj->dropped_frames = 0; + gwj->deleted_frames = 0; + gwj->flags = r->flags; + gwj->gwtype = r->gwtype; + + err = cgw_parse_attr(nlh, &gwj->mod, CGW_TYPE_CAN_CAN, &gwj->ccgw, + &limhops); + if (err < 0) + goto out; + + err = -ENODEV; + + /* ifindex == 0 is not allowed for job creation */ + if (!gwj->ccgw.src_idx || !gwj->ccgw.dst_idx) + goto out; + + gwj->src.dev = __dev_get_by_index(&init_net, gwj->ccgw.src_idx); + + if (!gwj->src.dev) + goto out; + + if (gwj->src.dev->type != ARPHRD_CAN) + goto out; + + gwj->dst.dev = __dev_get_by_index(&init_net, gwj->ccgw.dst_idx); + + if (!gwj->dst.dev) + goto out; + + if (gwj->dst.dev->type != ARPHRD_CAN) + goto out; + + gwj->limit_hops = limhops; + + ASSERT_RTNL(); + + err = cgw_register_filter(gwj); + if (!err) + hlist_add_head_rcu(&gwj->list, &cgw_list); +out: + if (err) + kmem_cache_free(cgw_cache, gwj); + + return err; +} + +static void cgw_remove_all_jobs(void) +{ + struct cgw_job *gwj = NULL; + struct hlist_node *nx; + + ASSERT_RTNL(); + + hlist_for_each_entry_safe(gwj, nx, &cgw_list, list) { + hlist_del(&gwj->list); + cgw_unregister_filter(gwj); + kmem_cache_free(cgw_cache, gwj); + } +} + +static int cgw_remove_job(struct sk_buff *skb, struct nlmsghdr *nlh) +{ + struct cgw_job *gwj = NULL; + struct hlist_node *nx; + struct rtcanmsg *r; + struct cf_mod mod; + struct can_can_gw ccgw; + u8 limhops = 0; + int err = 0; + + if (!netlink_capable(skb, CAP_NET_ADMIN)) + return -EPERM; + + if (nlmsg_len(nlh) < sizeof(*r)) + return -EINVAL; + + r = nlmsg_data(nlh); + if (r->can_family != AF_CAN) + return -EPFNOSUPPORT; + + /* so far we only support CAN -> CAN routings */ + if (r->gwtype != CGW_TYPE_CAN_CAN) + return -EINVAL; + + err = cgw_parse_attr(nlh, &mod, CGW_TYPE_CAN_CAN, &ccgw, &limhops); + if (err < 0) + return err; + + /* two interface indices both set to 0 => remove all entries */ + if (!ccgw.src_idx && !ccgw.dst_idx) { + cgw_remove_all_jobs(); + return 0; + } + + err = -EINVAL; + + ASSERT_RTNL(); + + /* remove only the first matching entry */ + hlist_for_each_entry_safe(gwj, nx, &cgw_list, list) { + + if (gwj->flags != r->flags) + continue; + + if (gwj->limit_hops != limhops) + continue; + + if (memcmp(&gwj->mod, &mod, sizeof(mod))) + continue; + + /* if (r->gwtype == CGW_TYPE_CAN_CAN) - is made sure here */ + if (memcmp(&gwj->ccgw, &ccgw, sizeof(ccgw))) + continue; + + hlist_del(&gwj->list); + cgw_unregister_filter(gwj); + kmem_cache_free(cgw_cache, gwj); + err = 0; + break; + } + + return err; +} + +static __init int cgw_module_init(void) +{ + /* sanitize given module parameter */ + max_hops = clamp_t(unsigned int, max_hops, CGW_MIN_HOPS, CGW_MAX_HOPS); + + pr_info("can: netlink gateway (rev " CAN_GW_VERSION ") max_hops=%d\n", + max_hops); + + cgw_cache = kmem_cache_create("can_gw", sizeof(struct cgw_job), + 0, 0, NULL); + + if (!cgw_cache) + return -ENOMEM; + + /* set notifier */ + notifier.notifier_call = cgw_notifier; + register_netdevice_notifier(¬ifier); + + if (__rtnl_register(PF_CAN, RTM_GETROUTE, NULL, cgw_dump_jobs, NULL)) { + unregister_netdevice_notifier(¬ifier); + kmem_cache_destroy(cgw_cache); + return -ENOBUFS; + } + + /* Only the first call to __rtnl_register can fail */ + __rtnl_register(PF_CAN, RTM_NEWROUTE, cgw_create_job, NULL, NULL); + __rtnl_register(PF_CAN, RTM_DELROUTE, cgw_remove_job, NULL, NULL); + + return 0; +} + +static __exit void cgw_module_exit(void) +{ + rtnl_unregister_all(PF_CAN); + + unregister_netdevice_notifier(¬ifier); + + rtnl_lock(); + cgw_remove_all_jobs(); + rtnl_unlock(); + + rcu_barrier(); /* Wait for completion of call_rcu()'s */ + + kmem_cache_destroy(cgw_cache); +} + +module_init(cgw_module_init); +module_exit(cgw_module_exit); diff --git a/net/can/proc.c b/net/can/proc.c index 520fef5e539..1a19b985a86 100644 --- a/net/can/proc.c +++ b/net/can/proc.c @@ -37,14 +37,13 @@ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH * DAMAGE. * - * Send feedback to <socketcan-users@lists.berlios.de> - * */ #include <linux/module.h> #include <linux/proc_fs.h> #include <linux/list.h> #include <linux/rcupdate.h> +#include <linux/if_arp.h> #include <linux/can/core.h> #include "af_can.h" @@ -81,7 +80,6 @@ static const char rx_list_name[][8] = { [RX_ALL] = "rx_all", [RX_FIL] = "rx_fil", [RX_INV] = "rx_inv", - [RX_EFF] = "rx_eff", }; /* @@ -190,269 +188,320 @@ void can_stat_update(unsigned long data) /* * proc read functions - * - * From known use-cases we expect about 10 entries in a receive list to be - * printed in the proc_fs. So PAGE_SIZE is definitely enough space here. - * */ -static int can_print_rcvlist(char *page, int len, struct hlist_head *rx_list, - struct net_device *dev) +static void can_print_rcvlist(struct seq_file *m, struct hlist_head *rx_list, + struct net_device *dev) { struct receiver *r; - struct hlist_node *n; - rcu_read_lock(); - hlist_for_each_entry_rcu(r, n, rx_list, list) { + hlist_for_each_entry_rcu(r, rx_list, list) { char *fmt = (r->can_id & CAN_EFF_FLAG)? - " %-5s %08X %08x %08x %08x %8ld %s\n" : - " %-5s %03X %08x %08lx %08lx %8ld %s\n"; - - len += snprintf(page + len, PAGE_SIZE - len, fmt, - DNAME(dev), r->can_id, r->mask, - (unsigned long)r->func, (unsigned long)r->data, - r->matches, r->ident); + " %-5s %08x %08x %pK %pK %8ld %s\n" : + " %-5s %03x %08x %pK %pK %8ld %s\n"; - /* does a typical line fit into the current buffer? */ - - /* 100 Bytes before end of buffer */ - if (len > PAGE_SIZE - 100) { - /* mark output cut off */ - len += snprintf(page + len, PAGE_SIZE - len, - " (..)\n"); - break; - } + seq_printf(m, fmt, DNAME(dev), r->can_id, r->mask, + r->func, r->data, r->matches, r->ident); } - rcu_read_unlock(); - - return len; } -static int can_print_recv_banner(char *page, int len) +static void can_print_recv_banner(struct seq_file *m) { /* * can1. 00000000 00000000 00000000 * ....... 0 tp20 */ - len += snprintf(page + len, PAGE_SIZE - len, - " device can_id can_mask function" + seq_puts(m, " device can_id can_mask function" " userdata matches ident\n"); - - return len; } -static int can_proc_read_stats(char *page, char **start, off_t off, - int count, int *eof, void *data) +static int can_stats_proc_show(struct seq_file *m, void *v) { - int len = 0; - - len += snprintf(page + len, PAGE_SIZE - len, "\n"); - len += snprintf(page + len, PAGE_SIZE - len, - " %8ld transmitted frames (TXF)\n", - can_stats.tx_frames); - len += snprintf(page + len, PAGE_SIZE - len, - " %8ld received frames (RXF)\n", can_stats.rx_frames); - len += snprintf(page + len, PAGE_SIZE - len, - " %8ld matched frames (RXMF)\n", can_stats.matches); + seq_putc(m, '\n'); + seq_printf(m, " %8ld transmitted frames (TXF)\n", can_stats.tx_frames); + seq_printf(m, " %8ld received frames (RXF)\n", can_stats.rx_frames); + seq_printf(m, " %8ld matched frames (RXMF)\n", can_stats.matches); - len += snprintf(page + len, PAGE_SIZE - len, "\n"); + seq_putc(m, '\n'); if (can_stattimer.function == can_stat_update) { - len += snprintf(page + len, PAGE_SIZE - len, - " %8ld %% total match ratio (RXMR)\n", + seq_printf(m, " %8ld %% total match ratio (RXMR)\n", can_stats.total_rx_match_ratio); - len += snprintf(page + len, PAGE_SIZE - len, - " %8ld frames/s total tx rate (TXR)\n", + seq_printf(m, " %8ld frames/s total tx rate (TXR)\n", can_stats.total_tx_rate); - len += snprintf(page + len, PAGE_SIZE - len, - " %8ld frames/s total rx rate (RXR)\n", + seq_printf(m, " %8ld frames/s total rx rate (RXR)\n", can_stats.total_rx_rate); - len += snprintf(page + len, PAGE_SIZE - len, "\n"); + seq_putc(m, '\n'); - len += snprintf(page + len, PAGE_SIZE - len, - " %8ld %% current match ratio (CRXMR)\n", + seq_printf(m, " %8ld %% current match ratio (CRXMR)\n", can_stats.current_rx_match_ratio); - len += snprintf(page + len, PAGE_SIZE - len, - " %8ld frames/s current tx rate (CTXR)\n", + seq_printf(m, " %8ld frames/s current tx rate (CTXR)\n", can_stats.current_tx_rate); - len += snprintf(page + len, PAGE_SIZE - len, - " %8ld frames/s current rx rate (CRXR)\n", + seq_printf(m, " %8ld frames/s current rx rate (CRXR)\n", can_stats.current_rx_rate); - len += snprintf(page + len, PAGE_SIZE - len, "\n"); + seq_putc(m, '\n'); - len += snprintf(page + len, PAGE_SIZE - len, - " %8ld %% max match ratio (MRXMR)\n", + seq_printf(m, " %8ld %% max match ratio (MRXMR)\n", can_stats.max_rx_match_ratio); - len += snprintf(page + len, PAGE_SIZE - len, - " %8ld frames/s max tx rate (MTXR)\n", + seq_printf(m, " %8ld frames/s max tx rate (MTXR)\n", can_stats.max_tx_rate); - len += snprintf(page + len, PAGE_SIZE - len, - " %8ld frames/s max rx rate (MRXR)\n", + seq_printf(m, " %8ld frames/s max rx rate (MRXR)\n", can_stats.max_rx_rate); - len += snprintf(page + len, PAGE_SIZE - len, "\n"); + seq_putc(m, '\n'); } - len += snprintf(page + len, PAGE_SIZE - len, - " %8ld current receive list entries (CRCV)\n", + seq_printf(m, " %8ld current receive list entries (CRCV)\n", can_pstats.rcv_entries); - len += snprintf(page + len, PAGE_SIZE - len, - " %8ld maximum receive list entries (MRCV)\n", + seq_printf(m, " %8ld maximum receive list entries (MRCV)\n", can_pstats.rcv_entries_max); if (can_pstats.stats_reset) - len += snprintf(page + len, PAGE_SIZE - len, - "\n %8ld statistic resets (STR)\n", + seq_printf(m, "\n %8ld statistic resets (STR)\n", can_pstats.stats_reset); if (can_pstats.user_reset) - len += snprintf(page + len, PAGE_SIZE - len, - " %8ld user statistic resets (USTR)\n", + seq_printf(m, " %8ld user statistic resets (USTR)\n", can_pstats.user_reset); - len += snprintf(page + len, PAGE_SIZE - len, "\n"); - - *eof = 1; - return len; + seq_putc(m, '\n'); + return 0; } -static int can_proc_read_reset_stats(char *page, char **start, off_t off, - int count, int *eof, void *data) +static int can_stats_proc_open(struct inode *inode, struct file *file) { - int len = 0; + return single_open(file, can_stats_proc_show, NULL); +} + +static const struct file_operations can_stats_proc_fops = { + .owner = THIS_MODULE, + .open = can_stats_proc_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; +static int can_reset_stats_proc_show(struct seq_file *m, void *v) +{ user_reset = 1; if (can_stattimer.function == can_stat_update) { - len += snprintf(page + len, PAGE_SIZE - len, - "Scheduled statistic reset #%ld.\n", + seq_printf(m, "Scheduled statistic reset #%ld.\n", can_pstats.stats_reset + 1); } else { if (can_stats.jiffies_init != jiffies) can_init_stats(); - len += snprintf(page + len, PAGE_SIZE - len, - "Performed statistic reset #%ld.\n", + seq_printf(m, "Performed statistic reset #%ld.\n", can_pstats.stats_reset); } + return 0; +} - *eof = 1; - return len; +static int can_reset_stats_proc_open(struct inode *inode, struct file *file) +{ + return single_open(file, can_reset_stats_proc_show, NULL); } -static int can_proc_read_version(char *page, char **start, off_t off, - int count, int *eof, void *data) +static const struct file_operations can_reset_stats_proc_fops = { + .owner = THIS_MODULE, + .open = can_reset_stats_proc_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static int can_version_proc_show(struct seq_file *m, void *v) +{ + seq_printf(m, "%s\n", CAN_VERSION_STRING); + return 0; +} + +static int can_version_proc_open(struct inode *inode, struct file *file) +{ + return single_open(file, can_version_proc_show, NULL); +} + +static const struct file_operations can_version_proc_fops = { + .owner = THIS_MODULE, + .open = can_version_proc_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static inline void can_rcvlist_proc_show_one(struct seq_file *m, int idx, + struct net_device *dev, + struct dev_rcv_lists *d) { - int len = 0; + if (!hlist_empty(&d->rx[idx])) { + can_print_recv_banner(m); + can_print_rcvlist(m, &d->rx[idx], dev); + } else + seq_printf(m, " (%s: no entry)\n", DNAME(dev)); - len += snprintf(page + len, PAGE_SIZE - len, "%s\n", - CAN_VERSION_STRING); - *eof = 1; - return len; } -static int can_proc_read_rcvlist(char *page, char **start, off_t off, - int count, int *eof, void *data) +static int can_rcvlist_proc_show(struct seq_file *m, void *v) { /* double cast to prevent GCC warning */ - int idx = (int)(long)data; - int len = 0; + int idx = (int)(long)m->private; + struct net_device *dev; struct dev_rcv_lists *d; - struct hlist_node *n; - len += snprintf(page + len, PAGE_SIZE - len, - "\nreceive list '%s':\n", rx_list_name[idx]); + seq_printf(m, "\nreceive list '%s':\n", rx_list_name[idx]); rcu_read_lock(); - hlist_for_each_entry_rcu(d, n, &can_rx_dev_list, list) { - if (!hlist_empty(&d->rx[idx])) { - len = can_print_recv_banner(page, len); - len = can_print_rcvlist(page, len, &d->rx[idx], d->dev); - } else - len += snprintf(page + len, PAGE_SIZE - len, - " (%s: no entry)\n", DNAME(d->dev)); + /* receive list for 'all' CAN devices (dev == NULL) */ + d = &can_rx_alldev_list; + can_rcvlist_proc_show_one(m, idx, NULL, d); - /* exit on end of buffer? */ - if (len > PAGE_SIZE - 100) - break; + /* receive list for registered CAN devices */ + for_each_netdev_rcu(&init_net, dev) { + if (dev->type == ARPHRD_CAN && dev->ml_priv) + can_rcvlist_proc_show_one(m, idx, dev, dev->ml_priv); } + rcu_read_unlock(); - len += snprintf(page + len, PAGE_SIZE - len, "\n"); + seq_putc(m, '\n'); + return 0; +} - *eof = 1; - return len; +static int can_rcvlist_proc_open(struct inode *inode, struct file *file) +{ + return single_open(file, can_rcvlist_proc_show, PDE_DATA(inode)); } -static int can_proc_read_rcvlist_sff(char *page, char **start, off_t off, - int count, int *eof, void *data) +static const struct file_operations can_rcvlist_proc_fops = { + .owner = THIS_MODULE, + .open = can_rcvlist_proc_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static inline void can_rcvlist_proc_show_array(struct seq_file *m, + struct net_device *dev, + struct hlist_head *rcv_array, + unsigned int rcv_array_sz) { - int len = 0; + unsigned int i; + int all_empty = 1; + + /* check whether at least one list is non-empty */ + for (i = 0; i < rcv_array_sz; i++) + if (!hlist_empty(&rcv_array[i])) { + all_empty = 0; + break; + } + + if (!all_empty) { + can_print_recv_banner(m); + for (i = 0; i < rcv_array_sz; i++) { + if (!hlist_empty(&rcv_array[i])) + can_print_rcvlist(m, &rcv_array[i], dev); + } + } else + seq_printf(m, " (%s: no entry)\n", DNAME(dev)); +} + +static int can_rcvlist_sff_proc_show(struct seq_file *m, void *v) +{ + struct net_device *dev; struct dev_rcv_lists *d; - struct hlist_node *n; /* RX_SFF */ - len += snprintf(page + len, PAGE_SIZE - len, - "\nreceive list 'rx_sff':\n"); + seq_puts(m, "\nreceive list 'rx_sff':\n"); rcu_read_lock(); - hlist_for_each_entry_rcu(d, n, &can_rx_dev_list, list) { - int i, all_empty = 1; - /* check wether at least one list is non-empty */ - for (i = 0; i < 0x800; i++) - if (!hlist_empty(&d->rx_sff[i])) { - all_empty = 0; - break; - } - - if (!all_empty) { - len = can_print_recv_banner(page, len); - for (i = 0; i < 0x800; i++) { - if (!hlist_empty(&d->rx_sff[i]) && - len < PAGE_SIZE - 100) - len = can_print_rcvlist(page, len, - &d->rx_sff[i], - d->dev); - } - } else - len += snprintf(page + len, PAGE_SIZE - len, - " (%s: no entry)\n", DNAME(d->dev)); - - /* exit on end of buffer? */ - if (len > PAGE_SIZE - 100) - break; + + /* sff receive list for 'all' CAN devices (dev == NULL) */ + d = &can_rx_alldev_list; + can_rcvlist_proc_show_array(m, NULL, d->rx_sff, ARRAY_SIZE(d->rx_sff)); + + /* sff receive list for registered CAN devices */ + for_each_netdev_rcu(&init_net, dev) { + if (dev->type == ARPHRD_CAN && dev->ml_priv) { + d = dev->ml_priv; + can_rcvlist_proc_show_array(m, dev, d->rx_sff, + ARRAY_SIZE(d->rx_sff)); + } } + rcu_read_unlock(); - len += snprintf(page + len, PAGE_SIZE - len, "\n"); + seq_putc(m, '\n'); + return 0; +} - *eof = 1; - return len; +static int can_rcvlist_sff_proc_open(struct inode *inode, struct file *file) +{ + return single_open(file, can_rcvlist_sff_proc_show, NULL); } -/* - * proc utility functions - */ +static const struct file_operations can_rcvlist_sff_proc_fops = { + .owner = THIS_MODULE, + .open = can_rcvlist_sff_proc_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; -static struct proc_dir_entry *can_create_proc_readentry(const char *name, - mode_t mode, - read_proc_t *read_proc, - void *data) + +static int can_rcvlist_eff_proc_show(struct seq_file *m, void *v) { - if (can_dir) - return create_proc_read_entry(name, mode, can_dir, read_proc, - data); - else - return NULL; + struct net_device *dev; + struct dev_rcv_lists *d; + + /* RX_EFF */ + seq_puts(m, "\nreceive list 'rx_eff':\n"); + + rcu_read_lock(); + + /* eff receive list for 'all' CAN devices (dev == NULL) */ + d = &can_rx_alldev_list; + can_rcvlist_proc_show_array(m, NULL, d->rx_eff, ARRAY_SIZE(d->rx_eff)); + + /* eff receive list for registered CAN devices */ + for_each_netdev_rcu(&init_net, dev) { + if (dev->type == ARPHRD_CAN && dev->ml_priv) { + d = dev->ml_priv; + can_rcvlist_proc_show_array(m, dev, d->rx_eff, + ARRAY_SIZE(d->rx_eff)); + } + } + + rcu_read_unlock(); + + seq_putc(m, '\n'); + return 0; } +static int can_rcvlist_eff_proc_open(struct inode *inode, struct file *file) +{ + return single_open(file, can_rcvlist_eff_proc_show, NULL); +} + +static const struct file_operations can_rcvlist_eff_proc_fops = { + .owner = THIS_MODULE, + .open = can_rcvlist_eff_proc_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +/* + * proc utility functions + */ + static void can_remove_proc_readentry(const char *name) { if (can_dir) @@ -473,27 +522,25 @@ void can_init_proc(void) return; } - can_dir->owner = THIS_MODULE; - /* own procfs entries from the AF_CAN core */ - pde_version = can_create_proc_readentry(CAN_PROC_VERSION, 0644, - can_proc_read_version, NULL); - pde_stats = can_create_proc_readentry(CAN_PROC_STATS, 0644, - can_proc_read_stats, NULL); - pde_reset_stats = can_create_proc_readentry(CAN_PROC_RESET_STATS, 0644, - can_proc_read_reset_stats, NULL); - pde_rcvlist_err = can_create_proc_readentry(CAN_PROC_RCVLIST_ERR, 0644, - can_proc_read_rcvlist, (void *)RX_ERR); - pde_rcvlist_all = can_create_proc_readentry(CAN_PROC_RCVLIST_ALL, 0644, - can_proc_read_rcvlist, (void *)RX_ALL); - pde_rcvlist_fil = can_create_proc_readentry(CAN_PROC_RCVLIST_FIL, 0644, - can_proc_read_rcvlist, (void *)RX_FIL); - pde_rcvlist_inv = can_create_proc_readentry(CAN_PROC_RCVLIST_INV, 0644, - can_proc_read_rcvlist, (void *)RX_INV); - pde_rcvlist_eff = can_create_proc_readentry(CAN_PROC_RCVLIST_EFF, 0644, - can_proc_read_rcvlist, (void *)RX_EFF); - pde_rcvlist_sff = can_create_proc_readentry(CAN_PROC_RCVLIST_SFF, 0644, - can_proc_read_rcvlist_sff, NULL); + pde_version = proc_create(CAN_PROC_VERSION, 0644, can_dir, + &can_version_proc_fops); + pde_stats = proc_create(CAN_PROC_STATS, 0644, can_dir, + &can_stats_proc_fops); + pde_reset_stats = proc_create(CAN_PROC_RESET_STATS, 0644, can_dir, + &can_reset_stats_proc_fops); + pde_rcvlist_err = proc_create_data(CAN_PROC_RCVLIST_ERR, 0644, can_dir, + &can_rcvlist_proc_fops, (void *)RX_ERR); + pde_rcvlist_all = proc_create_data(CAN_PROC_RCVLIST_ALL, 0644, can_dir, + &can_rcvlist_proc_fops, (void *)RX_ALL); + pde_rcvlist_fil = proc_create_data(CAN_PROC_RCVLIST_FIL, 0644, can_dir, + &can_rcvlist_proc_fops, (void *)RX_FIL); + pde_rcvlist_inv = proc_create_data(CAN_PROC_RCVLIST_INV, 0644, can_dir, + &can_rcvlist_proc_fops, (void *)RX_INV); + pde_rcvlist_eff = proc_create(CAN_PROC_RCVLIST_EFF, 0644, can_dir, + &can_rcvlist_eff_proc_fops); + pde_rcvlist_sff = proc_create(CAN_PROC_RCVLIST_SFF, 0644, can_dir, + &can_rcvlist_sff_proc_fops); } /* @@ -529,5 +576,5 @@ void can_remove_proc(void) can_remove_proc_readentry(CAN_PROC_RCVLIST_SFF); if (can_dir) - proc_net_remove(&init_net, "can"); + remove_proc_entry("can", init_net.proc_net); } diff --git a/net/can/raw.c b/net/can/raw.c index 94cd7f27c44..081e81fd017 100644 --- a/net/can/raw.c +++ b/net/can/raw.c @@ -37,31 +37,32 @@ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH * DAMAGE. * - * Send feedback to <socketcan-users@lists.berlios.de> - * */ #include <linux/module.h> #include <linux/init.h> #include <linux/uio.h> #include <linux/net.h> +#include <linux/slab.h> #include <linux/netdevice.h> #include <linux/socket.h> #include <linux/if_arp.h> #include <linux/skbuff.h> #include <linux/can.h> #include <linux/can/core.h> +#include <linux/can/skb.h> #include <linux/can/raw.h> #include <net/sock.h> #include <net/net_namespace.h> #define CAN_RAW_VERSION CAN_VERSION -static __initdata const char banner[] = +static __initconst const char banner[] = KERN_INFO "can: raw protocol (rev " CAN_RAW_VERSION ")\n"; MODULE_DESCRIPTION("PF_CAN raw protocol"); MODULE_LICENSE("Dual BSD/GPL"); MODULE_AUTHOR("Urs Thuermann <urs.thuermann@volkswagen.de>"); +MODULE_ALIAS("can-proto-1"); #define MASK_ALL 0 @@ -82,30 +83,52 @@ struct raw_sock { struct notifier_block notifier; int loopback; int recv_own_msgs; + int fd_frames; int count; /* number of active filters */ struct can_filter dfilter; /* default/single filter */ struct can_filter *filter; /* pointer to filter(s) */ can_err_mask_t err_mask; }; +/* + * Return pointer to store the extra msg flags for raw_recvmsg(). + * We use the space of one unsigned int beyond the 'struct sockaddr_can' + * in skb->cb. + */ +static inline unsigned int *raw_flags(struct sk_buff *skb) +{ + BUILD_BUG_ON(sizeof(skb->cb) <= (sizeof(struct sockaddr_can) + + sizeof(unsigned int))); + + /* return pointer after struct sockaddr_can */ + return (unsigned int *)(&((struct sockaddr_can *)skb->cb)[1]); +} + static inline struct raw_sock *raw_sk(const struct sock *sk) { return (struct raw_sock *)sk; } -static void raw_rcv(struct sk_buff *skb, void *data) +static void raw_rcv(struct sk_buff *oskb, void *data) { struct sock *sk = (struct sock *)data; struct raw_sock *ro = raw_sk(sk); struct sockaddr_can *addr; + struct sk_buff *skb; + unsigned int *pflags; - if (!ro->recv_own_msgs) { - /* check the received tx sock reference */ - if (skb->sk == sk) { - kfree_skb(skb); - return; - } - } + /* check the received tx sock reference */ + if (!ro->recv_own_msgs && oskb->sk == sk) + return; + + /* do not pass non-CAN2.0 frames to a legacy socket */ + if (!ro->fd_frames && oskb->len != CAN_MTU) + return; + + /* clone the given skb to be able to enqueue it into the rcv queue */ + skb = skb_clone(oskb, GFP_ATOMIC); + if (!skb) + return; /* * Put the datagram to the queue so that raw_recvmsg() can @@ -120,6 +143,14 @@ static void raw_rcv(struct sk_buff *skb, void *data) addr->can_family = AF_CAN; addr->can_ifindex = skb->dev->ifindex; + /* add CAN specific message flags for raw_recvmsg() */ + pflags = raw_flags(skb); + *pflags = 0; + if (oskb->sk) + *pflags |= MSG_DONTROUTE; + if (oskb->sk == sk) + *pflags |= MSG_CONFIRM; + if (sock_queue_rcv_skb(sk, skb) < 0) kfree_skb(skb); } @@ -204,13 +235,13 @@ static int raw_enable_allfilters(struct net_device *dev, struct sock *sk) } static int raw_notifier(struct notifier_block *nb, - unsigned long msg, void *data) + unsigned long msg, void *ptr) { - struct net_device *dev = (struct net_device *)data; + struct net_device *dev = netdev_notifier_info_to_dev(ptr); struct raw_sock *ro = container_of(nb, struct raw_sock, notifier); struct sock *sk = &ro->sk; - if (dev->nd_net != &init_net) + if (!net_eq(dev_net(dev), &init_net)) return NOTIFY_DONE; if (dev->type != ARPHRD_CAN) @@ -266,6 +297,7 @@ static int raw_init(struct sock *sk) /* set default loopback behaviour */ ro->loopback = 1; ro->recv_own_msgs = 0; + ro->fd_frames = 0; /* set notifier */ ro->notifier.notifier_call = raw_notifier; @@ -278,7 +310,12 @@ static int raw_init(struct sock *sk) static int raw_release(struct socket *sock) { struct sock *sk = sock->sk; - struct raw_sock *ro = raw_sk(sk); + struct raw_sock *ro; + + if (!sk) + return 0; + + ro = raw_sk(sk); unregister_netdevice_notifier(&ro->notifier); @@ -305,6 +342,9 @@ static int raw_release(struct socket *sock) ro->bound = 0; ro->count = 0; + sock_orphan(sk); + sock->sk = NULL; + release_sock(sk); sock_put(sk); @@ -396,6 +436,7 @@ static int raw_getname(struct socket *sock, struct sockaddr *uaddr, if (peer) return -EOPNOTSUPP; + memset(addr, 0, sizeof(*addr)); addr->can_family = AF_CAN; addr->can_ifindex = ro->ifindex; @@ -405,7 +446,7 @@ static int raw_getname(struct socket *sock, struct sockaddr *uaddr, } static int raw_setsockopt(struct socket *sock, int level, int optname, - char __user *optval, int optlen) + char __user *optval, unsigned int optlen) { struct sock *sk = sock->sk; struct raw_sock *ro = raw_sk(sk); @@ -418,8 +459,6 @@ static int raw_setsockopt(struct socket *sock, int level, int optname, if (level != SOL_CAN_RAW) return -EINVAL; - if (optlen < 0) - return -EINVAL; switch (optname) { @@ -431,19 +470,12 @@ static int raw_setsockopt(struct socket *sock, int level, int optname, if (count > 1) { /* filter does not fit into dfilter => alloc space */ - filter = kmalloc(optlen, GFP_KERNEL); - if (!filter) - return -ENOMEM; - - err = copy_from_user(filter, optval, optlen); - if (err) { - kfree(filter); - return err; - } + filter = memdup_user(optval, optlen); + if (IS_ERR(filter)) + return PTR_ERR(filter); } else if (count == 1) { - err = copy_from_user(&sfilter, optval, optlen); - if (err) - return err; + if (copy_from_user(&sfilter, optval, sizeof(sfilter))) + return -EFAULT; } lock_sock(sk); @@ -493,9 +525,8 @@ static int raw_setsockopt(struct socket *sock, int level, int optname, if (optlen != sizeof(err_mask)) return -EINVAL; - err = copy_from_user(&err_mask, optval, optlen); - if (err) - return err; + if (copy_from_user(&err_mask, optval, optlen)) + return -EFAULT; err_mask &= CAN_ERR_MASK; @@ -531,7 +562,8 @@ static int raw_setsockopt(struct socket *sock, int level, int optname, if (optlen != sizeof(ro->loopback)) return -EINVAL; - err = copy_from_user(&ro->loopback, optval, optlen); + if (copy_from_user(&ro->loopback, optval, optlen)) + return -EFAULT; break; @@ -539,7 +571,17 @@ static int raw_setsockopt(struct socket *sock, int level, int optname, if (optlen != sizeof(ro->recv_own_msgs)) return -EINVAL; - err = copy_from_user(&ro->recv_own_msgs, optval, optlen); + if (copy_from_user(&ro->recv_own_msgs, optval, optlen)) + return -EFAULT; + + break; + + case CAN_RAW_FD_FRAMES: + if (optlen != sizeof(ro->fd_frames)) + return -EINVAL; + + if (copy_from_user(&ro->fd_frames, optval, optlen)) + return -EFAULT; break; @@ -573,7 +615,8 @@ static int raw_getsockopt(struct socket *sock, int level, int optname, int fsize = ro->count * sizeof(struct can_filter); if (len > fsize) len = fsize; - err = copy_to_user(optval, ro->filter, len); + if (copy_to_user(optval, ro->filter, len)) + err = -EFAULT; } else len = 0; release_sock(sk); @@ -600,6 +643,12 @@ static int raw_getsockopt(struct socket *sock, int level, int optname, val = &ro->recv_own_msgs; break; + case CAN_RAW_FD_FRAMES: + if (len > sizeof(int)) + len = sizeof(int); + val = &ro->fd_frames; + break; + default: return -ENOPROTOOPT; } @@ -622,8 +671,10 @@ static int raw_sendmsg(struct kiocb *iocb, struct socket *sock, int err; if (msg->msg_name) { - struct sockaddr_can *addr = - (struct sockaddr_can *)msg->msg_name; + DECLARE_SOCKADDR(struct sockaddr_can *, addr, msg->msg_name); + + if (msg->msg_namelen < sizeof(*addr)) + return -EINVAL; if (addr->can_family != AF_CAN) return -EINVAL; @@ -632,34 +683,51 @@ static int raw_sendmsg(struct kiocb *iocb, struct socket *sock, } else ifindex = ro->ifindex; + if (ro->fd_frames) { + if (unlikely(size != CANFD_MTU && size != CAN_MTU)) + return -EINVAL; + } else { + if (unlikely(size != CAN_MTU)) + return -EINVAL; + } + dev = dev_get_by_index(&init_net, ifindex); if (!dev) return -ENXIO; - skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, - &err); - if (!skb) { - dev_put(dev); - return err; - } + skb = sock_alloc_send_skb(sk, size + sizeof(struct can_skb_priv), + msg->msg_flags & MSG_DONTWAIT, &err); + if (!skb) + goto put_dev; + + can_skb_reserve(skb); + can_skb_prv(skb)->ifindex = dev->ifindex; err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size); - if (err < 0) { - kfree_skb(skb); - dev_put(dev); - return err; - } + if (err < 0) + goto free_skb; + + sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags); + skb->dev = dev; skb->sk = sk; + skb->priority = sk->sk_priority; err = can_send(skb, ro->loopback); dev_put(dev); if (err) - return err; + goto send_failed; return size; + +free_skb: + kfree_skb(skb); +put_dev: + dev_put(dev); +send_failed: + return err; } static int raw_recvmsg(struct kiocb *iocb, struct socket *sock, @@ -688,19 +756,23 @@ static int raw_recvmsg(struct kiocb *iocb, struct socket *sock, return err; } - sock_recv_timestamp(msg, sk, skb); + sock_recv_ts_and_drops(msg, sk, skb); if (msg->msg_name) { + __sockaddr_check_size(sizeof(struct sockaddr_can)); msg->msg_namelen = sizeof(struct sockaddr_can); memcpy(msg->msg_name, skb->cb, msg->msg_namelen); } + /* assign the flags that have been recorded in raw_rcv() */ + msg->msg_flags |= *(raw_flags(skb)); + skb_free_datagram(sk, skb); return size; } -static struct proto_ops raw_ops __read_mostly = { +static const struct proto_ops raw_ops = { .family = PF_CAN, .release = raw_release, .bind = raw_bind, @@ -709,7 +781,7 @@ static struct proto_ops raw_ops __read_mostly = { .accept = sock_no_accept, .getname = raw_getname, .poll = datagram_poll, - .ioctl = NULL, /* use can_ioctl() from af_can.c */ + .ioctl = can_ioctl, /* use can_ioctl() from af_can.c */ .listen = sock_no_listen, .shutdown = sock_no_shutdown, .setsockopt = raw_setsockopt, @@ -727,10 +799,9 @@ static struct proto raw_proto __read_mostly = { .init = raw_init, }; -static struct can_proto raw_can_proto __read_mostly = { +static const struct can_proto raw_can_proto = { .type = SOCK_RAW, .protocol = CAN_RAW, - .capability = -1, .ops = &raw_ops, .prot = &raw_proto, }; |