cregit-Linux how code gets into the kernel

Release 4.8 net/can/gw.c

Directory: net/can
/*
 * 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;
	
u32 uid;
};


/*
 * 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; }

Contributors

PersonTokensPropCommitsCommitProp
oliver hartkoppoliver hartkopp52100.00%1100.00%
Total52100.00%1100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
oliver hartkoppoliver hartkopp53100.00%1100.00%
Total53100.00%1100.00%


static inline int calc_idx(int idx, int rx_dlc) { if (idx < 0) return rx_dlc + idx; else return idx; }

Contributors

PersonTokensPropCommitsCommitProp
oliver hartkoppoliver hartkopp28100.00%1100.00%
Total28100.00%1100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
oliver hartkoppoliver hartkopp147100.00%1100.00%
Total147100.00%1100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
oliver hartkoppoliver hartkopp63100.00%1100.00%
Total63100.00%1100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
oliver hartkoppoliver hartkopp63100.00%1100.00%
Total63100.00%1100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
oliver hartkoppoliver hartkopp261100.00%1100.00%
Total261100.00%1100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
oliver hartkoppoliver hartkopp160100.00%1100.00%
Total160100.00%1100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
oliver hartkoppoliver hartkopp160100.00%1100.00%
Total160100.00%1100.00%

/* 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/unused 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++; }

Contributors

PersonTokensPropCommitsCommitProp
oliver hartkoppoliver hartkopp38899.74%685.71%
jeremiah mahlerjeremiah mahler10.26%114.29%
Total389100.00%7100.00%


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"); }

Contributors

PersonTokensPropCommitsCommitProp
oliver hartkoppoliver hartkopp44100.00%1100.00%
Total44100.00%1100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
oliver hartkoppoliver hartkopp41100.00%1100.00%
Total41100.00%1100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
oliver hartkoppoliver hartkopp12794.07%133.33%
jiri pirkojiri pirko53.70%133.33%
wei yongjunwei yongjun32.22%133.33%
Total135100.00%3100.00%


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.uid) { if (nla_put_u32(skb, CGW_MOD_UID, gwj->mod.uid) < 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; } nlmsg_end(skb, nlh); return 0; cancel: nlmsg_cancel(skb, nlh); return -EMSGSIZE; }

Contributors

PersonTokensPropCommitsCommitProp
oliver hartkoppoliver hartkopp68396.06%457.14%
thomas grafthomas graf253.52%228.57%
johannes bergjohannes berg30.42%114.29%
Total711100.00%7100.00%

/* 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; }

Contributors

PersonTokensPropCommitsCommitProp
oliver hartkoppoliver hartkopp9483.19%133.33%
thomas grafthomas graf1815.93%133.33%
eric w. biedermaneric w. biederman10.88%133.33%
Total113100.00%3100.00%

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 }, [CGW_MOD_UID] = { .type = NLA_U32 }, }; /* 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 (tb[CGW_MOD_UID]) { nla_memcpy(&mod->uid, tb[CGW_MOD_UID], sizeof(u32)); } } 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; }

Contributors

PersonTokensPropCommitsCommitProp
oliver hartkoppoliver hartkopp94599.26%375.00%
thomas grafthomas graf70.74%125.00%
Total952100.00%4100.00%


static int cgw_create_job(struct sk_buff *skb, struct nlmsghdr *nlh) { struct rtcanmsg *r; struct cgw_job *gwj; 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; if (mod.uid) { ASSERT_RTNL(); /* check for updating an existing job with identical uid */ hlist_for_each_entry(gwj, &cgw_list, list) { if (gwj->mod.uid != mod.uid) continue; /* interfaces & filters must be identical */ if (memcmp(&gwj->ccgw, &ccgw, sizeof(ccgw))) return -EINVAL; /* update modifications with disabled softirq & quit */ local_bh_disable(); memcpy(&gwj->mod, &mod, sizeof(mod)); local_bh_enable(); return 0; } } /* ifindex == 0 is not allowed for job creation */ if (!ccgw.src_idx || !ccgw.dst_idx) return -ENODEV; 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; gwj->limit_hops = limhops; /* insert already parsed information */ memcpy(&gwj->mod, &mod, sizeof(mod)); memcpy(&gwj->ccgw, &ccgw, sizeof(ccgw)); err = -ENODEV; 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; 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; }

Contributors

PersonTokensPropCommitsCommitProp
oliver hartkoppoliver hartkopp44495.90%457.14%
eric w. biedermaneric w. biederman143.02%228.57%
ying xueying xue51.08%114.29%
Total463100.00%7100.00%


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); } }

Contributors

PersonTokensPropCommitsCommitProp
oliver hartkoppoliver hartkopp5294.55%150.00%
wei yongjunwei yongjun35.45%150.00%
Total55100.00%2100.00%


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; /* we have a match when uid is enabled and identical */ if (gwj->mod.uid || mod.uid) { if (gwj->mod.uid != mod.uid) continue; } else { /* no uid => check for identical modifications */ 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; }

Contributors

PersonTokensPropCommitsCommitProp
oliver hartkoppoliver hartkopp28594.37%350.00%
eric w. biedermaneric w. biederman144.64%233.33%
wei yongjunwei yongjun30.99%116.67%
Total302100.00%6100.00%


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(&notifier); if (__rtnl_register(PF_CAN, RTM_GETROUTE, NULL, cgw_dump_jobs, NULL)) { unregister_netdevice_notifier(&notifier); 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; }

Contributors

PersonTokensPropCommitsCommitProp
oliver hartkoppoliver hartkopp135100.00%2100.00%
Total135100.00%2100.00%


static __exit void cgw_module_exit(void) { rtnl_unregister_all(PF_CAN); unregister_netdevice_notifier(&notifier); rtnl_lock(); cgw_remove_all_jobs(); rtnl_unlock(); rcu_barrier(); /* Wait for completion of call_rcu()'s */ kmem_cache_destroy(cgw_cache); }

Contributors

PersonTokensPropCommitsCommitProp
oliver hartkoppoliver hartkopp38100.00%1100.00%
Total38100.00%1100.00%

module_init(cgw_module_init); module_exit(cgw_module_exit);

Overall Contributors

PersonTokensPropCommitsCommitProp
oliver hartkoppoliver hartkopp474095.10%735.00%
thomas grafthomas graf1903.81%315.00%
eric w. biedermaneric w. biederman290.58%315.00%
wei yongjunwei yongjun90.18%15.00%
jiri pirkojiri pirko50.10%15.00%
ying xueying xue50.10%15.00%
johannes bergjohannes berg30.06%15.00%
daniel balutadaniel baluta10.02%15.00%
marc kleine-buddemarc kleine-budde10.02%15.00%
jeremiah mahlerjeremiah mahler10.02%15.00%
Total4984100.00%20100.00%
Directory: net/can
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.