/*
* gw.c - CAN frame Gateway/Router/Bridge with netlink interface
*
- * Copyright (c) 2002-2010 Volkswagen Group Electronic Research
+ * Copyright (c) 2011 Volkswagen Group Electronic Research
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
#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 <socketcan/can/gw.h>
#include <net/rtnetlink.h>
#include <net/net_namespace.h>
+#include <net/sock.h>
#include <socketcan/can/version.h> /* for RCSID. Removed by mkpatch script */
RCSID("$Id$");
-#define CAN_GW_VERSION "20100218"
+#define CAN_GW_VERSION "20101209"
static __initdata const char banner[] =
KERN_INFO "can: netlink gateway (rev " CAN_GW_VERSION ")\n";
MODULE_DESCRIPTION("PF_CAN netlink gateway");
MODULE_LICENSE("Dual BSD/GPL");
MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>");
+MODULE_ALIAS("can-gw");
-HLIST_HEAD(can_gw_list);
-static DEFINE_SPINLOCK(can_gw_list_lock);
+HLIST_HEAD(cgw_list);
static struct notifier_block notifier;
-static struct kmem_cache *gw_cache __read_mostly;
+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;
+};
-#define GW_SK_MAGIC ((void *)(¬ifier))
/*
* So far we just support CAN -> CAN routing and frame modifications.
*
- * The internal can_can_gw structure contains optional attributes for
+ * The internal can_can_gw structure contains data and attributes for
* a CAN -> CAN gateway job.
*/
struct can_can_gw {
struct can_filter filter;
- struct {
- struct can_frame and;
- struct can_frame or;
- struct can_frame xor;
- struct can_frame set;
- } modframe;
- void (*modfunc[MAX_MODFUNCTIONS])(struct can_frame *cf,
- struct can_can_gw *mod);
+ int src_idx;
+ int dst_idx;
};
/* list entry for CAN gateways jobs */
-struct gw_job {
+struct cgw_job {
struct hlist_node list;
struct rcu_head rcu;
- struct net_device *src_dev;
- struct net_device *dst_dev;
- u32 flags;
u32 handled_frames;
u32 dropped_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;
+ u16 flags;
};
-/* content of u32 gwjob.flags */
-#define CAN_TX_LOOPBACK 0x00000001
-#define CAN_TX_SRC_TSTAMP 0x00000002
+/* 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.
+ */
-/* modification functions that are invoked in the hot path in gw_rcv */
-void mod_and_id (struct can_frame *cf, struct can_can_gw *mod) {
- cf->can_id &= mod->modframe.and.can_id;
-}
-void mod_and_dlc (struct can_frame *cf, struct can_can_gw *mod) {
- cf->can_dlc &= mod->modframe.and.can_dlc;
-}
-void mod_and_data (struct can_frame *cf, struct can_can_gw *mod) {
- *(u64 *)cf->data &= *(u64 *)mod->modframe.and.data;
+ dst->can_id = src->can_id;
+ dst->can_dlc = src->can_dlc;
+ *(u64 *)dst->data = *(u64 *)src->data;
}
-void mod_or_id (struct can_frame *cf, struct can_can_gw *mod) {
- cf->can_id |= mod->modframe.or.can_id;
-}
-void mod_or_dlc (struct can_frame *cf, struct can_can_gw *mod) {
- cf->can_dlc |= mod->modframe.or.can_dlc;
-}
-void mod_or_data (struct can_frame *cf, struct can_can_gw *mod) {
- *(u64 *)cf->data |= *(u64 *)mod->modframe.or.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;
}
-void mod_xor_id (struct can_frame *cf, struct can_can_gw *mod) {
- cf->can_id ^= mod->modframe.xor.can_id;
+
+static inline int calc_idx(int idx, int rx_dlc)
+{
+ if (idx < 0)
+ return rx_dlc + idx;
+ else
+ return idx;
}
-void mod_xor_dlc (struct can_frame *cf, struct can_can_gw *mod) {
- cf->can_dlc ^= mod->modframe.xor.can_dlc;
+
+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;
}
-void mod_xor_data (struct can_frame *cf, struct can_can_gw *mod) {
- *(u64 *)cf->data ^= *(u64 *)mod->modframe.xor.data;
+
+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;
}
-void mod_set_id (struct can_frame *cf, struct can_can_gw *mod) {
- cf->can_id = mod->modframe.set.can_id;
+
+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;
}
-void mod_set_dlc (struct can_frame *cf, struct can_can_gw *mod) {
- cf->can_dlc = mod->modframe.set.can_dlc;
+
+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;
}
-void mod_set_data (struct can_frame *cf, struct can_can_gw *mod) {
- *(u64 *)cf->data = *(u64 *)mod->modframe.set.data;
+
+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 gw_rcv(struct sk_buff *skb, void *data)
+static void can_can_gw_rcv(struct sk_buff *skb, void *data)
{
- struct gw_job *gwj = (struct gw_job *)data;
+ struct cgw_job *gwj = (struct cgw_job *)data;
struct can_frame *cf;
struct sk_buff *nskb;
int modidx = 0;
- /* do not handle already routed frames */
- if (skb->sk == GW_SK_MAGIC)
+ /* do not handle already routed frames - see comment below */
+ if (skb_mac_header_was_set(skb))
return;
- if (!netif_running(gwj->dst_dev)) {
+ if (!(gwj->dst.dev->flags & IFF_UP)) {
gwj->dropped_frames++;
return;
}
* When there is at least one modification function activated,
* we need to copy the skb as we want to modify skb->data.
*/
- if (gwj->ccgw.modfunc[0])
+ if (gwj->mod.modfunc[0])
nskb = skb_copy(skb, GFP_ATOMIC);
else
nskb = skb_clone(skb, GFP_ATOMIC);
return;
}
- /* mark routed frames with a 'special' sk value */
- nskb->sk = GW_SK_MAGIC;
- nskb->dev = gwj->dst_dev;
+ /*
+ * Mark routed frames by setting some mac header length which is
+ * not relevant for the CAN frames located in the skb->data section.
+ *
+ * As dev->header_ops is not set in CAN netdevices no one is ever
+ * accessing the various header offsets in the CAN skbuffs anyway.
+ * E.g. using the packet socket to read CAN frames is still working.
+ */
+ skb_set_mac_header(nskb, 8);
+ 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->ccgw.modfunc[modidx])
- (*gwj->ccgw.modfunc[modidx++])(cf, &gwj->ccgw);
+ 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 & CAN_TX_SRC_TSTAMP))
+ if (!(gwj->flags & CGW_FLAGS_CAN_SRC_TSTAMP))
nskb->tstamp.tv64 = 0;
/* send to netdevice */
- if (can_send(nskb, gwj->flags & CAN_TX_LOOPBACK))
+ if (can_send(nskb, gwj->flags & CGW_FLAGS_CAN_ECHO))
gwj->dropped_frames++;
else
gwj->handled_frames++;
}
-static inline int can_gw_register_filter(struct gw_job *gwj)
+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, gw_rcv, gwj, "gw");
+ 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 can_gw_unregister_filter(struct gw_job *gwj)
+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, gw_rcv, gwj);
+ can_rx_unregister(gwj->src.dev, gwj->ccgw.filter.can_id,
+ gwj->ccgw.filter.can_mask, can_can_gw_rcv, gwj);
}
-static int gw_notifier(struct notifier_block *nb,
+static int cgw_notifier(struct notifier_block *nb,
unsigned long msg, void *data)
{
struct net_device *dev = (struct net_device *)data;
if (msg == NETDEV_UNREGISTER) {
- struct gw_job *gwj = NULL;
+ struct cgw_job *gwj = NULL;
struct hlist_node *n, *nx;
- spin_lock(&can_gw_list_lock);
+ ASSERT_RTNL();
- hlist_for_each_entry_safe(gwj, n, nx, &can_gw_list, list) {
+ hlist_for_each_entry_safe(gwj, n, nx, &cgw_list, list) {
- if (gwj->src_dev == dev || gwj->dst_dev == dev) {
+ if (gwj->src.dev == dev || gwj->dst.dev == dev) {
hlist_del(&gwj->list);
- can_gw_unregister_filter(gwj);
+ cgw_unregister_filter(gwj);
kfree(gwj);
}
}
-
- spin_unlock(&can_gw_list_lock);
}
return NOTIFY_DONE;
}
-/*
- * Dump information about all ports, in response to GETROUTE
- */
-static int gw_dump_jobs(struct sk_buff *skb, struct netlink_callback *cb)
-{
- printk(KERN_INFO "%s (TODO)\n", __FUNCTION__);
-
- return 0;
-}
-
-static int gw_create_job(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
+static int cgw_put_job(struct sk_buff *skb, struct cgw_job *gwj)
{
+ struct cgw_frame_mod mb;
+ struct rtcanmsg *rtcan;
+ struct nlmsghdr *nlh = nlmsg_put(skb, 0, 0, 0, sizeof(*rtcan), 0);
+ 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;
+ else
+ nlh->nlmsg_len += NLA_HDRLEN + NLA_ALIGN(sizeof(u32));
+ }
- struct rtcanmsg *r;
- struct nlattr *tb[CGW_MAX+1];
- struct gw_job *gwj;
- u8 buf[CGW_MODATTR_LEN];
- int modidx = 0;
- int err = 0;
+ if (gwj->dropped_frames) {
+ if (nla_put_u32(skb, CGW_DROPPED, gwj->dropped_frames) < 0)
+ goto cancel;
+ else
+ nlh->nlmsg_len += NLA_HDRLEN + NLA_ALIGN(sizeof(u32));
+ }
- printk(KERN_INFO "%s: len %d attrlen %d\n", __FUNCTION__,
- nlmsg_len(nlh), nlmsg_attrlen(nlh, sizeof(*r)));
+ /* check non default settings of attributes */
- if (nlmsg_len(nlh) < sizeof(*r))
- return -EINVAL;
+ 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;
+ else
+ nlh->nlmsg_len += NLA_HDRLEN + NLA_ALIGN(sizeof(mb));
+ }
- r = nlmsg_data(nlh);
- if (r->can_family != AF_CAN)
- return -EPFNOSUPPORT;
+ 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;
+ else
+ nlh->nlmsg_len += NLA_HDRLEN + NLA_ALIGN(sizeof(mb));
+ }
- gwj = kmem_cache_alloc(gw_cache, GFP_KERNEL);
- if (!gwj)
- return -ENOMEM;
+ 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;
+ else
+ nlh->nlmsg_len += NLA_HDRLEN + NLA_ALIGN(sizeof(mb));
+ }
- gwj->src_dev = dev_get_by_index(&init_net, r->src_ifindex);
- if (!gwj->src_dev) {
- err = -ENODEV;
- goto fail;
+ 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;
+ else
+ nlh->nlmsg_len += NLA_HDRLEN + NLA_ALIGN(sizeof(mb));
}
- /* for now the source device needs to be a CAN device */
- if (gwj->src_dev->type != ARPHRD_CAN) {
- err = -ENODEV;
- goto put_src_fail;
+ if (gwj->mod.csumfunc.crc8) {
+ if (nla_put(skb, CGW_CS_CRC8, CGW_CS_CRC8_LEN,
+ &gwj->mod.csum.crc8) < 0)
+ goto cancel;
+ else
+ nlh->nlmsg_len += NLA_HDRLEN + \
+ NLA_ALIGN(CGW_CS_CRC8_LEN);
}
- gwj->dst_dev = dev_get_by_index(&init_net, r->dst_ifindex);
- if (!gwj->dst_dev) {
- err = -ENODEV;
- goto put_src_fail;
+ if (gwj->mod.csumfunc.xor) {
+ if (nla_put(skb, CGW_CS_XOR, CGW_CS_XOR_LEN,
+ &gwj->mod.csum.xor) < 0)
+ goto cancel;
+ else
+ nlh->nlmsg_len += NLA_HDRLEN + \
+ NLA_ALIGN(CGW_CS_XOR_LEN);
}
- /* for now the destination device needs to be a CAN device */
- if (gwj->dst_dev->type != ARPHRD_CAN) {
- err = -ENODEV;
- goto put_src_dst_fail;
+ 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;
+ else
+ nlh->nlmsg_len += NLA_HDRLEN +
+ NLA_ALIGN(sizeof(struct can_filter));
+ }
+
+ if (nla_put_u32(skb, CGW_SRC_IF, gwj->ccgw.src_idx) < 0)
+ goto cancel;
+ else
+ nlh->nlmsg_len += NLA_HDRLEN + NLA_ALIGN(sizeof(u32));
+
+ if (nla_put_u32(skb, CGW_DST_IF, gwj->ccgw.dst_idx) < 0)
+ goto cancel;
+ else
+ nlh->nlmsg_len += NLA_HDRLEN + NLA_ALIGN(sizeof(u32));
}
- gwj->flags = 0;
+ return skb->len;
- if (r->can_txflags & CAN_GW_TXFLAGS_LOOPBACK)
- gwj->flags |= CAN_TX_LOOPBACK;
+cancel:
+ nlmsg_cancel(skb, nlh);
+ return -EMSGSIZE;
+}
- if (r->can_txflags & CAN_GW_TXFLAGS_SRC_TSTAMP)
- gwj->flags |= CAN_TX_SRC_TSTAMP;
+/* 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;
+ struct hlist_node *n;
+ int idx = 0;
+ int s_idx = cb->args[0];
+
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(gwj, n, &cgw_list, list) {
+ if (idx < s_idx)
+ goto cont;
+
+ if (cgw_put_job(skb, gwj) < 0)
+ break;
+cont:
+ idx++;
+ }
+ rcu_read_unlock();
- memset(&gwj->ccgw, 0, sizeof(gwj->ccgw));
+ cb->args[0] = idx;
- /* check for additional attributes / filters here */
+ return skb->len;
+}
- err = nlmsg_parse(nlh, sizeof(*r), tb, CGW_MAX, NULL);
- if (err < 0)
- goto put_src_dst_fail;
+/* check for common and gwtype specific attributes */
+static int cgw_parse_attr(struct nlmsghdr *nlh, struct cf_mod *mod,
+ u8 gwtype, void *gwtypeattr)
+{
+ struct nlattr *tb[CGW_MAX+1];
+ struct cgw_frame_mod mb;
+ int modidx = 0;
+ int err = 0;
- /* check for can_filter in attributes */
- if (tb[CGW_FILTER] &&
- nla_len(tb[CGW_FILTER]) == sizeof(struct can_filter))
- nla_memcpy(&gwj->ccgw.filter, tb[CGW_FILTER],
- sizeof(struct can_filter));
+ /* initialize modification & checksum data space */
+ memset(mod, 0, sizeof(*mod));
+
+ err = nlmsg_parse(nlh, sizeof(struct rtcanmsg), tb, CGW_MAX, NULL);
+ if (err < 0)
+ return err;
/* check for AND/OR/XOR/SET modifications */
+
if (tb[CGW_MOD_AND] &&
nla_len(tb[CGW_MOD_AND]) == CGW_MODATTR_LEN) {
- nla_memcpy(&buf, tb[CGW_MOD_AND], CGW_MODATTR_LEN);
+ nla_memcpy(&mb, tb[CGW_MOD_AND], CGW_MODATTR_LEN);
- memcpy(&gwj->ccgw.modframe.and, buf,
- sizeof(struct can_frame));
+ canframecpy(&mod->modframe.and, &mb.cf);
+ mod->modtype.and = mb.modtype;
- if (buf[sizeof(struct can_frame)] & CGW_MOD_ID)
- gwj->ccgw.modfunc[modidx++] = mod_and_id;
+ if (mb.modtype & CGW_MOD_ID)
+ mod->modfunc[modidx++] = mod_and_id;
- if (buf[sizeof(struct can_frame)] & CGW_MOD_DLC)
- gwj->ccgw.modfunc[modidx++] = mod_and_dlc;
+ if (mb.modtype & CGW_MOD_DLC)
+ mod->modfunc[modidx++] = mod_and_dlc;
- if (buf[sizeof(struct can_frame)] & CGW_MOD_DATA)
- gwj->ccgw.modfunc[modidx++] = mod_and_data;
+ if (mb.modtype & CGW_MOD_DATA)
+ mod->modfunc[modidx++] = mod_and_data;
}
if (tb[CGW_MOD_OR] &&
nla_len(tb[CGW_MOD_OR]) == CGW_MODATTR_LEN) {
- nla_memcpy(&buf, tb[CGW_MOD_OR], CGW_MODATTR_LEN);
+ nla_memcpy(&mb, tb[CGW_MOD_OR], CGW_MODATTR_LEN);
- memcpy(&gwj->ccgw.modframe.or, buf,
- sizeof(struct can_frame));
+ canframecpy(&mod->modframe.or, &mb.cf);
+ mod->modtype.or = mb.modtype;
- if (buf[sizeof(struct can_frame)] & CGW_MOD_ID)
- gwj->ccgw.modfunc[modidx++] = mod_or_id;
+ if (mb.modtype & CGW_MOD_ID)
+ mod->modfunc[modidx++] = mod_or_id;
- if (buf[sizeof(struct can_frame)] & CGW_MOD_DLC)
- gwj->ccgw.modfunc[modidx++] = mod_or_dlc;
+ if (mb.modtype & CGW_MOD_DLC)
+ mod->modfunc[modidx++] = mod_or_dlc;
- if (buf[sizeof(struct can_frame)] & CGW_MOD_DATA)
- gwj->ccgw.modfunc[modidx++] = mod_or_data;
+ if (mb.modtype & CGW_MOD_DATA)
+ mod->modfunc[modidx++] = mod_or_data;
}
if (tb[CGW_MOD_XOR] &&
nla_len(tb[CGW_MOD_XOR]) == CGW_MODATTR_LEN) {
- nla_memcpy(&buf, tb[CGW_MOD_XOR], CGW_MODATTR_LEN);
+ nla_memcpy(&mb, tb[CGW_MOD_XOR], CGW_MODATTR_LEN);
- memcpy(&gwj->ccgw.modframe.xor, buf,
- sizeof(struct can_frame));
+ canframecpy(&mod->modframe.xor, &mb.cf);
+ mod->modtype.xor = mb.modtype;
- if (buf[sizeof(struct can_frame)] & CGW_MOD_ID)
- gwj->ccgw.modfunc[modidx++] = mod_xor_id;
+ if (mb.modtype & CGW_MOD_ID)
+ mod->modfunc[modidx++] = mod_xor_id;
- if (buf[sizeof(struct can_frame)] & CGW_MOD_DLC)
- gwj->ccgw.modfunc[modidx++] = mod_xor_dlc;
+ if (mb.modtype & CGW_MOD_DLC)
+ mod->modfunc[modidx++] = mod_xor_dlc;
- if (buf[sizeof(struct can_frame)] & CGW_MOD_DATA)
- gwj->ccgw.modfunc[modidx++] = mod_xor_data;
+ if (mb.modtype & CGW_MOD_DATA)
+ mod->modfunc[modidx++] = mod_xor_data;
}
if (tb[CGW_MOD_SET] &&
nla_len(tb[CGW_MOD_SET]) == CGW_MODATTR_LEN) {
- nla_memcpy(&buf, tb[CGW_MOD_SET], CGW_MODATTR_LEN);
+ nla_memcpy(&mb, tb[CGW_MOD_SET], CGW_MODATTR_LEN);
- memcpy(&gwj->ccgw.modframe.set, buf,
- sizeof(struct can_frame));
+ canframecpy(&mod->modframe.set, &mb.cf);
+ mod->modtype.set = mb.modtype;
- if (buf[sizeof(struct can_frame)] & CGW_MOD_ID)
- gwj->ccgw.modfunc[modidx++] = mod_set_id;
+ if (mb.modtype & CGW_MOD_ID)
+ mod->modfunc[modidx++] = mod_set_id;
- if (buf[sizeof(struct can_frame)] & CGW_MOD_DLC)
- gwj->ccgw.modfunc[modidx++] = mod_set_dlc;
+ if (mb.modtype & CGW_MOD_DLC)
+ mod->modfunc[modidx++] = mod_set_dlc;
- if (buf[sizeof(struct can_frame)] & CGW_MOD_DATA)
- gwj->ccgw.modfunc[modidx++] = mod_set_data;
+ if (mb.modtype & CGW_MOD_DATA)
+ mod->modfunc[modidx++] = mod_set_data;
}
- spin_lock(&can_gw_list_lock);
+ /* check for checksum operations after CAN frame modifications */
+ if (modidx) {
+
+ if (tb[CGW_CS_CRC8] &&
+ nla_len(tb[CGW_CS_CRC8]) == CGW_CS_CRC8_LEN) {
+
+ struct cgw_csum_crc8 *c = (struct cgw_csum_crc8 *)\
+ 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;
+ }
- err = can_gw_register_filter(gwj);
- if (!err)
- hlist_add_head_rcu(&gwj->list, &can_gw_list);
+ if (tb[CGW_CS_XOR] &&
+ nla_len(tb[CGW_CS_XOR]) == CGW_CS_XOR_LEN) {
+
+ struct cgw_csum_xor *c = (struct cgw_csum_xor *)\
+ 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;
+ }
+ }
- spin_unlock(&can_gw_list_lock);
-
- dev_put(gwj->src_dev);
- dev_put(gwj->dst_dev);
+ if (gwtype == CGW_TYPE_CAN_CAN) {
- if (err)
- goto fail;
+ /* 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_len(tb[CGW_FILTER]) == sizeof(struct can_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;
+
+ if (nla_len(tb[CGW_SRC_IF]) == sizeof(u32))
+ nla_memcpy(&ccgw->src_idx, tb[CGW_SRC_IF],
+ sizeof(u32));
+
+ if (nla_len(tb[CGW_DST_IF]) == sizeof(u32))
+ nla_memcpy(&ccgw->dst_idx, tb[CGW_DST_IF],
+ sizeof(u32));
+
+ /* 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,
+ void *arg)
+{
+ struct rtcanmsg *r;
+ struct cgw_job *gwj;
+ int err = 0;
+
+ 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->flags = r->flags;
+ gwj->gwtype = r->gwtype;
+
+ err = cgw_parse_attr(nlh, &gwj->mod, CGW_TYPE_CAN_CAN, &gwj->ccgw);
+ 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;
+
+ /* check for CAN netdev not using header_ops - see gw_rcv() */
+ if (gwj->src.dev->type != ARPHRD_CAN || gwj->src.dev->header_ops)
+ goto put_src_out;
+
+ gwj->dst.dev = dev_get_by_index(&init_net, gwj->ccgw.dst_idx);
+
+ if (!gwj->dst.dev)
+ goto put_src_out;
+
+ /* check for CAN netdev not using header_ops - see gw_rcv() */
+ if (gwj->dst.dev->type != ARPHRD_CAN || gwj->dst.dev->header_ops)
+ goto put_src_dst_out;
+
+ ASSERT_RTNL();
+
+ err = cgw_register_filter(gwj);
+ if (!err)
+ hlist_add_head_rcu(&gwj->list, &cgw_list);
+
+put_src_dst_out:
+ dev_put(gwj->dst.dev);
+put_src_out:
+ dev_put(gwj->src.dev);
+out:
+ if (err)
+ kmem_cache_free(cgw_cache, gwj);
-put_src_dst_fail:
- dev_put(gwj->dst_dev);
-put_src_fail:
- dev_put(gwj->src_dev);
-fail:
- kmem_cache_free(gw_cache, gwj);
return err;
}
-static int gw_remove_job(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
+static void cgw_remove_all_jobs(void)
{
- printk(KERN_INFO "%s (TODO)\n", __FUNCTION__);
+ struct cgw_job *gwj = NULL;
+ struct hlist_node *n, *nx;
- return 0;
+ ASSERT_RTNL();
+
+ hlist_for_each_entry_safe(gwj, n, nx, &cgw_list, list) {
+ hlist_del(&gwj->list);
+ cgw_unregister_filter(gwj);
+ kfree(gwj);
+ }
}
-static __init int gw_module_init(void)
+static int cgw_remove_job(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
+{
+ struct cgw_job *gwj = NULL;
+ struct hlist_node *n, *nx;
+ struct rtcanmsg *r;
+ struct cf_mod mod;
+ struct can_can_gw ccgw;
+ int err = 0;
+
+ 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);
+ 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, n, nx, &cgw_list, list) {
+
+ if (gwj->flags != r->flags)
+ 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);
+ kfree(gwj);
+ err = 0;
+ break;
+ }
+
+ return err;
+}
+
+static __init int cgw_module_init(void)
{
printk(banner);
- gw_cache = kmem_cache_create("can_gw", sizeof(struct gw_job),
+ cgw_cache = kmem_cache_create("can_gw", sizeof(struct cgw_job),
0, 0, NULL);
- if (!gw_cache)
+ if (!cgw_cache)
return -ENOMEM;
/* set notifier */
- notifier.notifier_call = gw_notifier;
+ notifier.notifier_call = cgw_notifier;
register_netdevice_notifier(¬ifier);
- if (__rtnl_register(PF_CAN, RTM_GETROUTE, NULL, gw_dump_jobs)) {
+ if (__rtnl_register(PF_CAN, RTM_GETROUTE, NULL, cgw_dump_jobs)) {
unregister_netdevice_notifier(¬ifier);
- kmem_cache_destroy(gw_cache);
+ kmem_cache_destroy(cgw_cache);
return -ENOBUFS;
}
/* Only the first call to __rtnl_register can fail */
- __rtnl_register(PF_CAN, RTM_NEWROUTE, gw_create_job, NULL);
- __rtnl_register(PF_CAN, RTM_DELROUTE, gw_remove_job, NULL);
+ __rtnl_register(PF_CAN, RTM_NEWROUTE, cgw_create_job, NULL);
+ __rtnl_register(PF_CAN, RTM_DELROUTE, cgw_remove_job, NULL);
return 0;
}
-static __exit void gw_module_exit(void)
+static __exit void cgw_module_exit(void)
{
- struct gw_job *gwj = NULL;
- struct hlist_node *n, *nx;
-
rtnl_unregister_all(PF_CAN);
unregister_netdevice_notifier(¬ifier);
- spin_lock(&can_gw_list_lock);
-
- hlist_for_each_entry_safe(gwj, n, nx, &can_gw_list, list) {
- hlist_del(&gwj->list);
- can_gw_unregister_filter(gwj);
- kfree(gwj);
- }
-
- spin_unlock(&can_gw_list_lock);
+ rtnl_lock();
+ cgw_remove_all_jobs();
+ rtnl_unlock();
rcu_barrier(); /* Wait for completion of call_rcu()'s */
- kmem_cache_destroy(gw_cache);
+ kmem_cache_destroy(cgw_cache);
}
-module_init(gw_module_init);
-module_exit(gw_module_exit);
+module_init(cgw_module_init);
+module_exit(cgw_module_exit);
projects / socketcan-devel.git / blobdiff