1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3- 1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
2 /* gw.c - CAN frame Gateway/Router/Bridge with 2 /* gw.c - CAN frame Gateway/Router/Bridge with netlink interface
3 * 3 *
4 * Copyright (c) 2019 Volkswagen Group Electro 4 * Copyright (c) 2019 Volkswagen Group Electronic Research
5 * All rights reserved. 5 * All rights reserved.
6 * 6 *
7 * Redistribution and use in source and binary 7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that t 8 * modification, are permitted provided that the following conditions
9 * are met: 9 * are met:
10 * 1. Redistributions of source code must reta 10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the 11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must repr 12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the 13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials pro 14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of Volkswagen nor the n 15 * 3. Neither the name of Volkswagen nor the names of its contributors
16 * may be used to endorse or promote produc 16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permissio 17 * without specific prior written permission.
18 * 18 *
19 * Alternatively, provided that this notice is 19 * Alternatively, provided that this notice is retained in full, this
20 * software may be distributed under the terms 20 * software may be distributed under the terms of the GNU General
21 * Public License ("GPL") version 2, in which 21 * Public License ("GPL") version 2, in which case the provisions of the
22 * GPL apply INSTEAD OF those given above. 22 * GPL apply INSTEAD OF those given above.
23 * 23 *
24 * The provided data structures and external i 24 * The provided data structures and external interfaces from this code
25 * are not restricted to be used by modules wi 25 * are not restricted to be used by modules with a GPL compatible license.
26 * 26 *
27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT 27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
28 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTI 28 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
29 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCH 29 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
30 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO 30 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
31 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIR 31 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
32 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGE 32 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
33 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
34 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
35 * THEORY OF LIABILITY, WHETHER IN CONTRACT, S 35 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
36 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 36 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
37 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE PO 37 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
38 * DAMAGE. 38 * DAMAGE.
39 * 39 *
40 */ 40 */
41 41
42 #include <linux/module.h> 42 #include <linux/module.h>
43 #include <linux/init.h> 43 #include <linux/init.h>
44 #include <linux/types.h> 44 #include <linux/types.h>
45 #include <linux/kernel.h> 45 #include <linux/kernel.h>
46 #include <linux/list.h> 46 #include <linux/list.h>
47 #include <linux/spinlock.h> 47 #include <linux/spinlock.h>
48 #include <linux/rcupdate.h> 48 #include <linux/rcupdate.h>
49 #include <linux/rculist.h> 49 #include <linux/rculist.h>
50 #include <linux/net.h> 50 #include <linux/net.h>
51 #include <linux/netdevice.h> 51 #include <linux/netdevice.h>
52 #include <linux/if_arp.h> 52 #include <linux/if_arp.h>
53 #include <linux/skbuff.h> 53 #include <linux/skbuff.h>
54 #include <linux/can.h> 54 #include <linux/can.h>
55 #include <linux/can/core.h> 55 #include <linux/can/core.h>
56 #include <linux/can/skb.h> 56 #include <linux/can/skb.h>
57 #include <linux/can/gw.h> 57 #include <linux/can/gw.h>
58 #include <net/rtnetlink.h> 58 #include <net/rtnetlink.h>
59 #include <net/net_namespace.h> 59 #include <net/net_namespace.h>
60 #include <net/sock.h> 60 #include <net/sock.h>
61 61
62 #define CAN_GW_NAME "can-gw" 62 #define CAN_GW_NAME "can-gw"
63 63
64 MODULE_DESCRIPTION("PF_CAN netlink gateway"); 64 MODULE_DESCRIPTION("PF_CAN netlink gateway");
65 MODULE_LICENSE("Dual BSD/GPL"); 65 MODULE_LICENSE("Dual BSD/GPL");
66 MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkop 66 MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>");
67 MODULE_ALIAS(CAN_GW_NAME); 67 MODULE_ALIAS(CAN_GW_NAME);
68 68
69 #define CGW_MIN_HOPS 1 69 #define CGW_MIN_HOPS 1
70 #define CGW_MAX_HOPS 6 70 #define CGW_MAX_HOPS 6
71 #define CGW_DEFAULT_HOPS 1 71 #define CGW_DEFAULT_HOPS 1
72 72
73 static unsigned int max_hops __read_mostly = C 73 static unsigned int max_hops __read_mostly = CGW_DEFAULT_HOPS;
74 module_param(max_hops, uint, 0444); 74 module_param(max_hops, uint, 0444);
75 MODULE_PARM_DESC(max_hops, 75 MODULE_PARM_DESC(max_hops,
76 "maximum " CAN_GW_NAME " rout 76 "maximum " CAN_GW_NAME " routing hops for CAN frames "
77 "(valid values: " __stringify 77 "(valid values: " __stringify(CGW_MIN_HOPS) "-"
78 __stringify(CGW_MAX_HOPS) " h 78 __stringify(CGW_MAX_HOPS) " hops, "
79 "default: " __stringify(CGW_D 79 "default: " __stringify(CGW_DEFAULT_HOPS) ")");
80 80
81 static struct notifier_block notifier; 81 static struct notifier_block notifier;
82 static struct kmem_cache *cgw_cache __read_mos 82 static struct kmem_cache *cgw_cache __read_mostly;
83 83
84 /* structure that contains the (on-the-fly) CA 84 /* structure that contains the (on-the-fly) CAN frame modifications */
85 struct cf_mod { 85 struct cf_mod {
86 struct { 86 struct {
87 struct canfd_frame and; 87 struct canfd_frame and;
88 struct canfd_frame or; 88 struct canfd_frame or;
89 struct canfd_frame xor; 89 struct canfd_frame xor;
90 struct canfd_frame set; 90 struct canfd_frame set;
91 } modframe; 91 } modframe;
92 struct { 92 struct {
93 u8 and; 93 u8 and;
94 u8 or; 94 u8 or;
95 u8 xor; 95 u8 xor;
96 u8 set; 96 u8 set;
97 } modtype; 97 } modtype;
98 void (*modfunc[MAX_MODFUNCTIONS])(stru 98 void (*modfunc[MAX_MODFUNCTIONS])(struct canfd_frame *cf,
99 stru 99 struct cf_mod *mod);
100 100
101 /* CAN frame checksum calculation afte 101 /* CAN frame checksum calculation after CAN frame modifications */
102 struct { 102 struct {
103 struct cgw_csum_xor xor; 103 struct cgw_csum_xor xor;
104 struct cgw_csum_crc8 crc8; 104 struct cgw_csum_crc8 crc8;
105 } csum; 105 } csum;
106 struct { 106 struct {
107 void (*xor)(struct canfd_frame 107 void (*xor)(struct canfd_frame *cf,
108 struct cgw_csum_xo 108 struct cgw_csum_xor *xor);
109 void (*crc8)(struct canfd_fram 109 void (*crc8)(struct canfd_frame *cf,
110 struct cgw_csum_c 110 struct cgw_csum_crc8 *crc8);
111 } csumfunc; 111 } csumfunc;
112 u32 uid; 112 u32 uid;
113 }; 113 };
114 114
115 /* So far we just support CAN -> CAN routing a 115 /* So far we just support CAN -> CAN routing and frame modifications.
116 * 116 *
117 * The internal can_can_gw structure contains 117 * The internal can_can_gw structure contains data and attributes for
118 * a CAN -> CAN gateway job. 118 * a CAN -> CAN gateway job.
119 */ 119 */
120 struct can_can_gw { 120 struct can_can_gw {
121 struct can_filter filter; 121 struct can_filter filter;
122 int src_idx; 122 int src_idx;
123 int dst_idx; 123 int dst_idx;
124 }; 124 };
125 125
126 /* list entry for CAN gateways jobs */ 126 /* list entry for CAN gateways jobs */
127 struct cgw_job { 127 struct cgw_job {
128 struct hlist_node list; 128 struct hlist_node list;
129 struct rcu_head rcu; 129 struct rcu_head rcu;
130 u32 handled_frames; 130 u32 handled_frames;
131 u32 dropped_frames; 131 u32 dropped_frames;
132 u32 deleted_frames; 132 u32 deleted_frames;
133 struct cf_mod mod; 133 struct cf_mod mod;
134 union { 134 union {
135 /* CAN frame data source */ 135 /* CAN frame data source */
136 struct net_device *dev; 136 struct net_device *dev;
137 } src; 137 } src;
138 union { 138 union {
139 /* CAN frame data destination 139 /* CAN frame data destination */
140 struct net_device *dev; 140 struct net_device *dev;
141 } dst; 141 } dst;
142 union { 142 union {
143 struct can_can_gw ccgw; 143 struct can_can_gw ccgw;
144 /* tbc */ 144 /* tbc */
145 }; 145 };
146 u8 gwtype; 146 u8 gwtype;
147 u8 limit_hops; 147 u8 limit_hops;
148 u16 flags; 148 u16 flags;
149 }; 149 };
150 150
151 /* modification functions that are invoked in 151 /* modification functions that are invoked in the hot path in can_can_gw_rcv */
152 152
153 #define MODFUNC(func, op) static void func(str 153 #define MODFUNC(func, op) static void func(struct canfd_frame *cf, \
154 str 154 struct cf_mod *mod) { op ; }
155 155
156 MODFUNC(mod_and_id, cf->can_id &= mod->modfram 156 MODFUNC(mod_and_id, cf->can_id &= mod->modframe.and.can_id)
157 MODFUNC(mod_and_len, cf->len &= mod->modframe. 157 MODFUNC(mod_and_len, cf->len &= mod->modframe.and.len)
158 MODFUNC(mod_and_flags, cf->flags &= mod->modfr 158 MODFUNC(mod_and_flags, cf->flags &= mod->modframe.and.flags)
159 MODFUNC(mod_and_data, *(u64 *)cf->data &= *(u6 159 MODFUNC(mod_and_data, *(u64 *)cf->data &= *(u64 *)mod->modframe.and.data)
160 MODFUNC(mod_or_id, cf->can_id |= mod->modframe 160 MODFUNC(mod_or_id, cf->can_id |= mod->modframe.or.can_id)
161 MODFUNC(mod_or_len, cf->len |= mod->modframe.o 161 MODFUNC(mod_or_len, cf->len |= mod->modframe.or.len)
162 MODFUNC(mod_or_flags, cf->flags |= mod->modfra 162 MODFUNC(mod_or_flags, cf->flags |= mod->modframe.or.flags)
163 MODFUNC(mod_or_data, *(u64 *)cf->data |= *(u64 163 MODFUNC(mod_or_data, *(u64 *)cf->data |= *(u64 *)mod->modframe.or.data)
164 MODFUNC(mod_xor_id, cf->can_id ^= mod->modfram 164 MODFUNC(mod_xor_id, cf->can_id ^= mod->modframe.xor.can_id)
165 MODFUNC(mod_xor_len, cf->len ^= mod->modframe. 165 MODFUNC(mod_xor_len, cf->len ^= mod->modframe.xor.len)
166 MODFUNC(mod_xor_flags, cf->flags ^= mod->modfr 166 MODFUNC(mod_xor_flags, cf->flags ^= mod->modframe.xor.flags)
167 MODFUNC(mod_xor_data, *(u64 *)cf->data ^= *(u6 167 MODFUNC(mod_xor_data, *(u64 *)cf->data ^= *(u64 *)mod->modframe.xor.data)
168 MODFUNC(mod_set_id, cf->can_id = mod->modframe 168 MODFUNC(mod_set_id, cf->can_id = mod->modframe.set.can_id)
169 MODFUNC(mod_set_len, cf->len = mod->modframe.s 169 MODFUNC(mod_set_len, cf->len = mod->modframe.set.len)
170 MODFUNC(mod_set_flags, cf->flags = mod->modfra 170 MODFUNC(mod_set_flags, cf->flags = mod->modframe.set.flags)
171 MODFUNC(mod_set_data, *(u64 *)cf->data = *(u64 171 MODFUNC(mod_set_data, *(u64 *)cf->data = *(u64 *)mod->modframe.set.data)
172 172
173 static void mod_and_fddata(struct canfd_frame 173 static void mod_and_fddata(struct canfd_frame *cf, struct cf_mod *mod)
174 { 174 {
175 int i; 175 int i;
176 176
177 for (i = 0; i < CANFD_MAX_DLEN; i += 8 177 for (i = 0; i < CANFD_MAX_DLEN; i += 8)
178 *(u64 *)(cf->data + i) &= *(u6 178 *(u64 *)(cf->data + i) &= *(u64 *)(mod->modframe.and.data + i);
179 } 179 }
180 180
181 static void mod_or_fddata(struct canfd_frame * 181 static void mod_or_fddata(struct canfd_frame *cf, struct cf_mod *mod)
182 { 182 {
183 int i; 183 int i;
184 184
185 for (i = 0; i < CANFD_MAX_DLEN; i += 8 185 for (i = 0; i < CANFD_MAX_DLEN; i += 8)
186 *(u64 *)(cf->data + i) |= *(u6 186 *(u64 *)(cf->data + i) |= *(u64 *)(mod->modframe.or.data + i);
187 } 187 }
188 188
189 static void mod_xor_fddata(struct canfd_frame 189 static void mod_xor_fddata(struct canfd_frame *cf, struct cf_mod *mod)
190 { 190 {
191 int i; 191 int i;
192 192
193 for (i = 0; i < CANFD_MAX_DLEN; i += 8 193 for (i = 0; i < CANFD_MAX_DLEN; i += 8)
194 *(u64 *)(cf->data + i) ^= *(u6 194 *(u64 *)(cf->data + i) ^= *(u64 *)(mod->modframe.xor.data + i);
195 } 195 }
196 196
197 static void mod_set_fddata(struct canfd_frame 197 static void mod_set_fddata(struct canfd_frame *cf, struct cf_mod *mod)
198 { 198 {
199 memcpy(cf->data, mod->modframe.set.dat 199 memcpy(cf->data, mod->modframe.set.data, CANFD_MAX_DLEN);
200 } 200 }
201 201
202 /* retrieve valid CC DLC value and store it in 202 /* retrieve valid CC DLC value and store it into 'len' */
203 static void mod_retrieve_ccdlc(struct canfd_fr 203 static void mod_retrieve_ccdlc(struct canfd_frame *cf)
204 { 204 {
205 struct can_frame *ccf = (struct can_fr 205 struct can_frame *ccf = (struct can_frame *)cf;
206 206
207 /* len8_dlc is only valid if len == CA 207 /* len8_dlc is only valid if len == CAN_MAX_DLEN */
208 if (ccf->len != CAN_MAX_DLEN) 208 if (ccf->len != CAN_MAX_DLEN)
209 return; 209 return;
210 210
211 /* do we have a valid len8_dlc value f 211 /* do we have a valid len8_dlc value from 9 .. 15 ? */
212 if (ccf->len8_dlc > CAN_MAX_DLEN && cc 212 if (ccf->len8_dlc > CAN_MAX_DLEN && ccf->len8_dlc <= CAN_MAX_RAW_DLC)
213 ccf->len = ccf->len8_dlc; 213 ccf->len = ccf->len8_dlc;
214 } 214 }
215 215
216 /* convert valid CC DLC value in 'len' into st 216 /* convert valid CC DLC value in 'len' into struct can_frame elements */
217 static void mod_store_ccdlc(struct canfd_frame 217 static void mod_store_ccdlc(struct canfd_frame *cf)
218 { 218 {
219 struct can_frame *ccf = (struct can_fr 219 struct can_frame *ccf = (struct can_frame *)cf;
220 220
221 /* clear potential leftovers */ 221 /* clear potential leftovers */
222 ccf->len8_dlc = 0; 222 ccf->len8_dlc = 0;
223 223
224 /* plain data length 0 .. 8 - that was 224 /* plain data length 0 .. 8 - that was easy */
225 if (ccf->len <= CAN_MAX_DLEN) 225 if (ccf->len <= CAN_MAX_DLEN)
226 return; 226 return;
227 227
228 /* potentially broken values are caugh 228 /* potentially broken values are caught in can_can_gw_rcv() */
229 if (ccf->len > CAN_MAX_RAW_DLC) 229 if (ccf->len > CAN_MAX_RAW_DLC)
230 return; 230 return;
231 231
232 /* we have a valid dlc value from 9 .. 232 /* we have a valid dlc value from 9 .. 15 in ccf->len */
233 ccf->len8_dlc = ccf->len; 233 ccf->len8_dlc = ccf->len;
234 ccf->len = CAN_MAX_DLEN; 234 ccf->len = CAN_MAX_DLEN;
235 } 235 }
236 236
237 static void mod_and_ccdlc(struct canfd_frame * 237 static void mod_and_ccdlc(struct canfd_frame *cf, struct cf_mod *mod)
238 { 238 {
239 mod_retrieve_ccdlc(cf); 239 mod_retrieve_ccdlc(cf);
240 mod_and_len(cf, mod); 240 mod_and_len(cf, mod);
241 mod_store_ccdlc(cf); 241 mod_store_ccdlc(cf);
242 } 242 }
243 243
244 static void mod_or_ccdlc(struct canfd_frame *c 244 static void mod_or_ccdlc(struct canfd_frame *cf, struct cf_mod *mod)
245 { 245 {
246 mod_retrieve_ccdlc(cf); 246 mod_retrieve_ccdlc(cf);
247 mod_or_len(cf, mod); 247 mod_or_len(cf, mod);
248 mod_store_ccdlc(cf); 248 mod_store_ccdlc(cf);
249 } 249 }
250 250
251 static void mod_xor_ccdlc(struct canfd_frame * 251 static void mod_xor_ccdlc(struct canfd_frame *cf, struct cf_mod *mod)
252 { 252 {
253 mod_retrieve_ccdlc(cf); 253 mod_retrieve_ccdlc(cf);
254 mod_xor_len(cf, mod); 254 mod_xor_len(cf, mod);
255 mod_store_ccdlc(cf); 255 mod_store_ccdlc(cf);
256 } 256 }
257 257
258 static void mod_set_ccdlc(struct canfd_frame * 258 static void mod_set_ccdlc(struct canfd_frame *cf, struct cf_mod *mod)
259 { 259 {
260 mod_set_len(cf, mod); 260 mod_set_len(cf, mod);
261 mod_store_ccdlc(cf); 261 mod_store_ccdlc(cf);
262 } 262 }
263 263
264 static void canframecpy(struct canfd_frame *ds 264 static void canframecpy(struct canfd_frame *dst, struct can_frame *src)
265 { 265 {
266 /* Copy the struct members separately 266 /* Copy the struct members separately to ensure that no uninitialized
267 * data are copied in the 3 bytes hole 267 * data are copied in the 3 bytes hole of the struct. This is needed
268 * to make easy compares of the data i 268 * to make easy compares of the data in the struct cf_mod.
269 */ 269 */
270 270
271 dst->can_id = src->can_id; 271 dst->can_id = src->can_id;
272 dst->len = src->len; 272 dst->len = src->len;
273 *(u64 *)dst->data = *(u64 *)src->data; 273 *(u64 *)dst->data = *(u64 *)src->data;
274 } 274 }
275 275
276 static void canfdframecpy(struct canfd_frame * 276 static void canfdframecpy(struct canfd_frame *dst, struct canfd_frame *src)
277 { 277 {
278 /* Copy the struct members separately 278 /* Copy the struct members separately to ensure that no uninitialized
279 * data are copied in the 2 bytes hole 279 * data are copied in the 2 bytes hole of the struct. This is needed
280 * to make easy compares of the data i 280 * to make easy compares of the data in the struct cf_mod.
281 */ 281 */
282 282
283 dst->can_id = src->can_id; 283 dst->can_id = src->can_id;
284 dst->flags = src->flags; 284 dst->flags = src->flags;
285 dst->len = src->len; 285 dst->len = src->len;
286 memcpy(dst->data, src->data, CANFD_MAX 286 memcpy(dst->data, src->data, CANFD_MAX_DLEN);
287 } 287 }
288 288
289 static int cgw_chk_csum_parms(s8 fr, s8 to, s8 289 static int cgw_chk_csum_parms(s8 fr, s8 to, s8 re, struct rtcanmsg *r)
290 { 290 {
291 s8 dlen = CAN_MAX_DLEN; 291 s8 dlen = CAN_MAX_DLEN;
292 292
293 if (r->flags & CGW_FLAGS_CAN_FD) 293 if (r->flags & CGW_FLAGS_CAN_FD)
294 dlen = CANFD_MAX_DLEN; 294 dlen = CANFD_MAX_DLEN;
295 295
296 /* absolute dlc values 0 .. 7 => 0 .. 296 /* absolute dlc values 0 .. 7 => 0 .. 7, e.g. data [0]
297 * relative to received dlc -1 .. -8 : 297 * relative to received dlc -1 .. -8 :
298 * e.g. for received dlc = 8 298 * e.g. for received dlc = 8
299 * -1 => index = 7 (data[7]) 299 * -1 => index = 7 (data[7])
300 * -3 => index = 5 (data[5]) 300 * -3 => index = 5 (data[5])
301 * -8 => index = 0 (data[0]) 301 * -8 => index = 0 (data[0])
302 */ 302 */
303 303
304 if (fr >= -dlen && fr < dlen && 304 if (fr >= -dlen && fr < dlen &&
305 to >= -dlen && to < dlen && 305 to >= -dlen && to < dlen &&
306 re >= -dlen && re < dlen) 306 re >= -dlen && re < dlen)
307 return 0; 307 return 0;
308 else 308 else
309 return -EINVAL; 309 return -EINVAL;
310 } 310 }
311 311
312 static inline int calc_idx(int idx, int rx_len 312 static inline int calc_idx(int idx, int rx_len)
313 { 313 {
314 if (idx < 0) 314 if (idx < 0)
315 return rx_len + idx; 315 return rx_len + idx;
316 else 316 else
317 return idx; 317 return idx;
318 } 318 }
319 319
320 static void cgw_csum_xor_rel(struct canfd_fram 320 static void cgw_csum_xor_rel(struct canfd_frame *cf, struct cgw_csum_xor *xor)
321 { 321 {
322 int from = calc_idx(xor->from_idx, cf- 322 int from = calc_idx(xor->from_idx, cf->len);
323 int to = calc_idx(xor->to_idx, cf->len 323 int to = calc_idx(xor->to_idx, cf->len);
324 int res = calc_idx(xor->result_idx, cf 324 int res = calc_idx(xor->result_idx, cf->len);
325 u8 val = xor->init_xor_val; 325 u8 val = xor->init_xor_val;
326 int i; 326 int i;
327 327
328 if (from < 0 || to < 0 || res < 0) 328 if (from < 0 || to < 0 || res < 0)
329 return; 329 return;
330 330
331 if (from <= to) { 331 if (from <= to) {
332 for (i = from; i <= to; i++) 332 for (i = from; i <= to; i++)
333 val ^= cf->data[i]; 333 val ^= cf->data[i];
334 } else { 334 } else {
335 for (i = from; i >= to; i--) 335 for (i = from; i >= to; i--)
336 val ^= cf->data[i]; 336 val ^= cf->data[i];
337 } 337 }
338 338
339 cf->data[res] = val; 339 cf->data[res] = val;
340 } 340 }
341 341
342 static void cgw_csum_xor_pos(struct canfd_fram 342 static void cgw_csum_xor_pos(struct canfd_frame *cf, struct cgw_csum_xor *xor)
343 { 343 {
344 u8 val = xor->init_xor_val; 344 u8 val = xor->init_xor_val;
345 int i; 345 int i;
346 346
347 for (i = xor->from_idx; i <= xor->to_i 347 for (i = xor->from_idx; i <= xor->to_idx; i++)
348 val ^= cf->data[i]; 348 val ^= cf->data[i];
349 349
350 cf->data[xor->result_idx] = val; 350 cf->data[xor->result_idx] = val;
351 } 351 }
352 352
353 static void cgw_csum_xor_neg(struct canfd_fram 353 static void cgw_csum_xor_neg(struct canfd_frame *cf, struct cgw_csum_xor *xor)
354 { 354 {
355 u8 val = xor->init_xor_val; 355 u8 val = xor->init_xor_val;
356 int i; 356 int i;
357 357
358 for (i = xor->from_idx; i >= xor->to_i 358 for (i = xor->from_idx; i >= xor->to_idx; i--)
359 val ^= cf->data[i]; 359 val ^= cf->data[i];
360 360
361 cf->data[xor->result_idx] = val; 361 cf->data[xor->result_idx] = val;
362 } 362 }
363 363
364 static void cgw_csum_crc8_rel(struct canfd_fra 364 static void cgw_csum_crc8_rel(struct canfd_frame *cf,
365 struct cgw_csum_ 365 struct cgw_csum_crc8 *crc8)
366 { 366 {
367 int from = calc_idx(crc8->from_idx, cf 367 int from = calc_idx(crc8->from_idx, cf->len);
368 int to = calc_idx(crc8->to_idx, cf->le 368 int to = calc_idx(crc8->to_idx, cf->len);
369 int res = calc_idx(crc8->result_idx, c 369 int res = calc_idx(crc8->result_idx, cf->len);
370 u8 crc = crc8->init_crc_val; 370 u8 crc = crc8->init_crc_val;
371 int i; 371 int i;
372 372
373 if (from < 0 || to < 0 || res < 0) 373 if (from < 0 || to < 0 || res < 0)
374 return; 374 return;
375 375
376 if (from <= to) { 376 if (from <= to) {
377 for (i = crc8->from_idx; i <= 377 for (i = crc8->from_idx; i <= crc8->to_idx; i++)
378 crc = crc8->crctab[crc 378 crc = crc8->crctab[crc ^ cf->data[i]];
379 } else { 379 } else {
380 for (i = crc8->from_idx; i >= 380 for (i = crc8->from_idx; i >= crc8->to_idx; i--)
381 crc = crc8->crctab[crc 381 crc = crc8->crctab[crc ^ cf->data[i]];
382 } 382 }
383 383
384 switch (crc8->profile) { 384 switch (crc8->profile) {
385 case CGW_CRC8PRF_1U8: 385 case CGW_CRC8PRF_1U8:
386 crc = crc8->crctab[crc ^ crc8- 386 crc = crc8->crctab[crc ^ crc8->profile_data[0]];
387 break; 387 break;
388 388
389 case CGW_CRC8PRF_16U8: 389 case CGW_CRC8PRF_16U8:
390 crc = crc8->crctab[crc ^ crc8- 390 crc = crc8->crctab[crc ^ crc8->profile_data[cf->data[1] & 0xF]];
391 break; 391 break;
392 392
393 case CGW_CRC8PRF_SFFID_XOR: 393 case CGW_CRC8PRF_SFFID_XOR:
394 crc = crc8->crctab[crc ^ (cf-> 394 crc = crc8->crctab[crc ^ (cf->can_id & 0xFF) ^
395 (cf->can_id 395 (cf->can_id >> 8 & 0xFF)];
396 break; 396 break;
397 } 397 }
398 398
399 cf->data[crc8->result_idx] = crc ^ crc 399 cf->data[crc8->result_idx] = crc ^ crc8->final_xor_val;
400 } 400 }
401 401
402 static void cgw_csum_crc8_pos(struct canfd_fra 402 static void cgw_csum_crc8_pos(struct canfd_frame *cf,
403 struct cgw_csum_ 403 struct cgw_csum_crc8 *crc8)
404 { 404 {
405 u8 crc = crc8->init_crc_val; 405 u8 crc = crc8->init_crc_val;
406 int i; 406 int i;
407 407
408 for (i = crc8->from_idx; i <= crc8->to 408 for (i = crc8->from_idx; i <= crc8->to_idx; i++)
409 crc = crc8->crctab[crc ^ cf->d 409 crc = crc8->crctab[crc ^ cf->data[i]];
410 410
411 switch (crc8->profile) { 411 switch (crc8->profile) {
412 case CGW_CRC8PRF_1U8: 412 case CGW_CRC8PRF_1U8:
413 crc = crc8->crctab[crc ^ crc8- 413 crc = crc8->crctab[crc ^ crc8->profile_data[0]];
414 break; 414 break;
415 415
416 case CGW_CRC8PRF_16U8: 416 case CGW_CRC8PRF_16U8:
417 crc = crc8->crctab[crc ^ crc8- 417 crc = crc8->crctab[crc ^ crc8->profile_data[cf->data[1] & 0xF]];
418 break; 418 break;
419 419
420 case CGW_CRC8PRF_SFFID_XOR: 420 case CGW_CRC8PRF_SFFID_XOR:
421 crc = crc8->crctab[crc ^ (cf-> 421 crc = crc8->crctab[crc ^ (cf->can_id & 0xFF) ^
422 (cf->can_id 422 (cf->can_id >> 8 & 0xFF)];
423 break; 423 break;
424 } 424 }
425 425
426 cf->data[crc8->result_idx] = crc ^ crc 426 cf->data[crc8->result_idx] = crc ^ crc8->final_xor_val;
427 } 427 }
428 428
429 static void cgw_csum_crc8_neg(struct canfd_fra 429 static void cgw_csum_crc8_neg(struct canfd_frame *cf,
430 struct cgw_csum_ 430 struct cgw_csum_crc8 *crc8)
431 { 431 {
432 u8 crc = crc8->init_crc_val; 432 u8 crc = crc8->init_crc_val;
433 int i; 433 int i;
434 434
435 for (i = crc8->from_idx; i >= crc8->to 435 for (i = crc8->from_idx; i >= crc8->to_idx; i--)
436 crc = crc8->crctab[crc ^ cf->d 436 crc = crc8->crctab[crc ^ cf->data[i]];
437 437
438 switch (crc8->profile) { 438 switch (crc8->profile) {
439 case CGW_CRC8PRF_1U8: 439 case CGW_CRC8PRF_1U8:
440 crc = crc8->crctab[crc ^ crc8- 440 crc = crc8->crctab[crc ^ crc8->profile_data[0]];
441 break; 441 break;
442 442
443 case CGW_CRC8PRF_16U8: 443 case CGW_CRC8PRF_16U8:
444 crc = crc8->crctab[crc ^ crc8- 444 crc = crc8->crctab[crc ^ crc8->profile_data[cf->data[1] & 0xF]];
445 break; 445 break;
446 446
447 case CGW_CRC8PRF_SFFID_XOR: 447 case CGW_CRC8PRF_SFFID_XOR:
448 crc = crc8->crctab[crc ^ (cf-> 448 crc = crc8->crctab[crc ^ (cf->can_id & 0xFF) ^
449 (cf->can_id 449 (cf->can_id >> 8 & 0xFF)];
450 break; 450 break;
451 } 451 }
452 452
453 cf->data[crc8->result_idx] = crc ^ crc 453 cf->data[crc8->result_idx] = crc ^ crc8->final_xor_val;
454 } 454 }
455 455
456 /* the receive & process & send function */ 456 /* the receive & process & send function */
457 static void can_can_gw_rcv(struct sk_buff *skb 457 static void can_can_gw_rcv(struct sk_buff *skb, void *data)
458 { 458 {
459 struct cgw_job *gwj = (struct cgw_job 459 struct cgw_job *gwj = (struct cgw_job *)data;
460 struct canfd_frame *cf; 460 struct canfd_frame *cf;
461 struct sk_buff *nskb; 461 struct sk_buff *nskb;
462 int modidx = 0; 462 int modidx = 0;
463 463
464 /* process strictly Classic CAN or CAN 464 /* process strictly Classic CAN or CAN FD frames */
465 if (gwj->flags & CGW_FLAGS_CAN_FD) { 465 if (gwj->flags & CGW_FLAGS_CAN_FD) {
466 if (!can_is_canfd_skb(skb)) 466 if (!can_is_canfd_skb(skb))
467 return; 467 return;
468 } else { 468 } else {
469 if (!can_is_can_skb(skb)) 469 if (!can_is_can_skb(skb))
470 return; 470 return;
471 } 471 }
472 472
473 /* Do not handle CAN frames routed mor 473 /* Do not handle CAN frames routed more than 'max_hops' times.
474 * In general we should never catch th 474 * In general we should never catch this delimiter which is intended
475 * to cover a misconfiguration protect 475 * to cover a misconfiguration protection (e.g. circular CAN routes).
476 * 476 *
477 * The Controller Area Network control 477 * The Controller Area Network controllers only accept CAN frames with
478 * correct CRCs - which are not visibl 478 * correct CRCs - which are not visible in the controller registers.
479 * According to skbuff.h documentation 479 * According to skbuff.h documentation the csum_start element for IP
480 * checksums is undefined/unused when 480 * checksums is undefined/unused when ip_summed == CHECKSUM_UNNECESSARY.
481 * Only CAN skbs can be processed here 481 * Only CAN skbs can be processed here which already have this property.
482 */ 482 */
483 483
484 #define cgw_hops(skb) ((skb)->csum_start) 484 #define cgw_hops(skb) ((skb)->csum_start)
485 485
486 BUG_ON(skb->ip_summed != CHECKSUM_UNNE 486 BUG_ON(skb->ip_summed != CHECKSUM_UNNECESSARY);
487 487
488 if (cgw_hops(skb) >= max_hops) { 488 if (cgw_hops(skb) >= max_hops) {
489 /* indicate deleted frames due 489 /* indicate deleted frames due to misconfiguration */
490 gwj->deleted_frames++; 490 gwj->deleted_frames++;
491 return; 491 return;
492 } 492 }
493 493
494 if (!(gwj->dst.dev->flags & IFF_UP)) { 494 if (!(gwj->dst.dev->flags & IFF_UP)) {
495 gwj->dropped_frames++; 495 gwj->dropped_frames++;
496 return; 496 return;
497 } 497 }
498 498
499 /* is sending the skb back to the inco 499 /* is sending the skb back to the incoming interface not allowed? */
500 if (!(gwj->flags & CGW_FLAGS_CAN_IIF_T 500 if (!(gwj->flags & CGW_FLAGS_CAN_IIF_TX_OK) &&
501 can_skb_prv(skb)->ifindex == gwj-> 501 can_skb_prv(skb)->ifindex == gwj->dst.dev->ifindex)
502 return; 502 return;
503 503
504 /* clone the given skb, which has not 504 /* clone the given skb, which has not been done in can_rcv()
505 * 505 *
506 * When there is at least one modifica 506 * When there is at least one modification function activated,
507 * we need to copy the skb as we want 507 * we need to copy the skb as we want to modify skb->data.
508 */ 508 */
509 if (gwj->mod.modfunc[0]) 509 if (gwj->mod.modfunc[0])
510 nskb = skb_copy(skb, GFP_ATOMI 510 nskb = skb_copy(skb, GFP_ATOMIC);
511 else 511 else
512 nskb = skb_clone(skb, GFP_ATOM 512 nskb = skb_clone(skb, GFP_ATOMIC);
513 513
514 if (!nskb) { 514 if (!nskb) {
515 gwj->dropped_frames++; 515 gwj->dropped_frames++;
516 return; 516 return;
517 } 517 }
518 518
519 /* put the incremented hop counter in 519 /* put the incremented hop counter in the cloned skb */
520 cgw_hops(nskb) = cgw_hops(skb) + 1; 520 cgw_hops(nskb) = cgw_hops(skb) + 1;
521 521
522 /* first processing of this CAN frame 522 /* first processing of this CAN frame -> adjust to private hop limit */
523 if (gwj->limit_hops && cgw_hops(nskb) 523 if (gwj->limit_hops && cgw_hops(nskb) == 1)
524 cgw_hops(nskb) = max_hops - gw 524 cgw_hops(nskb) = max_hops - gwj->limit_hops + 1;
525 525
526 nskb->dev = gwj->dst.dev; 526 nskb->dev = gwj->dst.dev;
527 527
528 /* pointer to modifiable CAN frame */ 528 /* pointer to modifiable CAN frame */
529 cf = (struct canfd_frame *)nskb->data; 529 cf = (struct canfd_frame *)nskb->data;
530 530
531 /* perform preprocessed modification f 531 /* perform preprocessed modification functions if there are any */
532 while (modidx < MAX_MODFUNCTIONS && gw 532 while (modidx < MAX_MODFUNCTIONS && gwj->mod.modfunc[modidx])
533 (*gwj->mod.modfunc[modidx++])( 533 (*gwj->mod.modfunc[modidx++])(cf, &gwj->mod);
534 534
535 /* Has the CAN frame been modified? */ 535 /* Has the CAN frame been modified? */
536 if (modidx) { 536 if (modidx) {
537 /* get available space for the 537 /* get available space for the processed CAN frame type */
538 int max_len = nskb->len - offs 538 int max_len = nskb->len - offsetof(struct canfd_frame, data);
539 539
540 /* dlc may have changed, make 540 /* dlc may have changed, make sure it fits to the CAN frame */
541 if (cf->len > max_len) { 541 if (cf->len > max_len) {
542 /* delete frame due to 542 /* delete frame due to misconfiguration */
543 gwj->deleted_frames++; 543 gwj->deleted_frames++;
544 kfree_skb(nskb); 544 kfree_skb(nskb);
545 return; 545 return;
546 } 546 }
547 547
548 /* check for checksum updates 548 /* check for checksum updates */
549 if (gwj->mod.csumfunc.crc8) 549 if (gwj->mod.csumfunc.crc8)
550 (*gwj->mod.csumfunc.cr 550 (*gwj->mod.csumfunc.crc8)(cf, &gwj->mod.csum.crc8);
551 551
552 if (gwj->mod.csumfunc.xor) 552 if (gwj->mod.csumfunc.xor)
553 (*gwj->mod.csumfunc.xo 553 (*gwj->mod.csumfunc.xor)(cf, &gwj->mod.csum.xor);
554 } 554 }
555 555
556 /* clear the skb timestamp if not conf 556 /* clear the skb timestamp if not configured the other way */
557 if (!(gwj->flags & CGW_FLAGS_CAN_SRC_T 557 if (!(gwj->flags & CGW_FLAGS_CAN_SRC_TSTAMP))
558 nskb->tstamp = 0; 558 nskb->tstamp = 0;
559 559
560 /* send to netdevice */ 560 /* send to netdevice */
561 if (can_send(nskb, gwj->flags & CGW_FL 561 if (can_send(nskb, gwj->flags & CGW_FLAGS_CAN_ECHO))
562 gwj->dropped_frames++; 562 gwj->dropped_frames++;
563 else 563 else
564 gwj->handled_frames++; 564 gwj->handled_frames++;
565 } 565 }
566 566
567 static inline int cgw_register_filter(struct n 567 static inline int cgw_register_filter(struct net *net, struct cgw_job *gwj)
568 { 568 {
569 return can_rx_register(net, gwj->src.d 569 return can_rx_register(net, gwj->src.dev, gwj->ccgw.filter.can_id,
570 gwj->ccgw.filte 570 gwj->ccgw.filter.can_mask, can_can_gw_rcv,
571 gwj, "gw", NULL 571 gwj, "gw", NULL);
572 } 572 }
573 573
574 static inline void cgw_unregister_filter(struc 574 static inline void cgw_unregister_filter(struct net *net, struct cgw_job *gwj)
575 { 575 {
576 can_rx_unregister(net, gwj->src.dev, g 576 can_rx_unregister(net, gwj->src.dev, gwj->ccgw.filter.can_id,
577 gwj->ccgw.filter.can 577 gwj->ccgw.filter.can_mask, can_can_gw_rcv, gwj);
578 } 578 }
579 579
580 static void cgw_job_free_rcu(struct rcu_head * 580 static void cgw_job_free_rcu(struct rcu_head *rcu_head)
581 { 581 {
582 struct cgw_job *gwj = container_of(rcu 582 struct cgw_job *gwj = container_of(rcu_head, struct cgw_job, rcu);
583 583
584 kmem_cache_free(cgw_cache, gwj); 584 kmem_cache_free(cgw_cache, gwj);
585 } 585 }
586 586
587 static int cgw_notifier(struct notifier_block 587 static int cgw_notifier(struct notifier_block *nb,
588 unsigned long msg, voi 588 unsigned long msg, void *ptr)
589 { 589 {
590 struct net_device *dev = netdev_notifi 590 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
591 struct net *net = dev_net(dev); 591 struct net *net = dev_net(dev);
592 592
593 if (dev->type != ARPHRD_CAN) 593 if (dev->type != ARPHRD_CAN)
594 return NOTIFY_DONE; 594 return NOTIFY_DONE;
595 595
596 if (msg == NETDEV_UNREGISTER) { 596 if (msg == NETDEV_UNREGISTER) {
597 struct cgw_job *gwj = NULL; 597 struct cgw_job *gwj = NULL;
598 struct hlist_node *nx; 598 struct hlist_node *nx;
599 599
600 ASSERT_RTNL(); 600 ASSERT_RTNL();
601 601
602 hlist_for_each_entry_safe(gwj, 602 hlist_for_each_entry_safe(gwj, nx, &net->can.cgw_list, list) {
603 if (gwj->src.dev == de 603 if (gwj->src.dev == dev || gwj->dst.dev == dev) {
604 hlist_del(&gwj 604 hlist_del(&gwj->list);
605 cgw_unregister 605 cgw_unregister_filter(net, gwj);
606 call_rcu(&gwj- 606 call_rcu(&gwj->rcu, cgw_job_free_rcu);
607 } 607 }
608 } 608 }
609 } 609 }
610 610
611 return NOTIFY_DONE; 611 return NOTIFY_DONE;
612 } 612 }
613 613
614 static int cgw_put_job(struct sk_buff *skb, st 614 static int cgw_put_job(struct sk_buff *skb, struct cgw_job *gwj, int type,
615 u32 pid, u32 seq, int f 615 u32 pid, u32 seq, int flags)
616 { 616 {
617 struct rtcanmsg *rtcan; 617 struct rtcanmsg *rtcan;
618 struct nlmsghdr *nlh; 618 struct nlmsghdr *nlh;
619 619
620 nlh = nlmsg_put(skb, pid, seq, type, s 620 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtcan), flags);
621 if (!nlh) 621 if (!nlh)
622 return -EMSGSIZE; 622 return -EMSGSIZE;
623 623
624 rtcan = nlmsg_data(nlh); 624 rtcan = nlmsg_data(nlh);
625 rtcan->can_family = AF_CAN; 625 rtcan->can_family = AF_CAN;
626 rtcan->gwtype = gwj->gwtype; 626 rtcan->gwtype = gwj->gwtype;
627 rtcan->flags = gwj->flags; 627 rtcan->flags = gwj->flags;
628 628
629 /* add statistics if available */ 629 /* add statistics if available */
630 630
631 if (gwj->handled_frames) { 631 if (gwj->handled_frames) {
632 if (nla_put_u32(skb, CGW_HANDL 632 if (nla_put_u32(skb, CGW_HANDLED, gwj->handled_frames) < 0)
633 goto cancel; 633 goto cancel;
634 } 634 }
635 635
636 if (gwj->dropped_frames) { 636 if (gwj->dropped_frames) {
637 if (nla_put_u32(skb, CGW_DROPP 637 if (nla_put_u32(skb, CGW_DROPPED, gwj->dropped_frames) < 0)
638 goto cancel; 638 goto cancel;
639 } 639 }
640 640
641 if (gwj->deleted_frames) { 641 if (gwj->deleted_frames) {
642 if (nla_put_u32(skb, CGW_DELET 642 if (nla_put_u32(skb, CGW_DELETED, gwj->deleted_frames) < 0)
643 goto cancel; 643 goto cancel;
644 } 644 }
645 645
646 /* check non default settings of attri 646 /* check non default settings of attributes */
647 647
648 if (gwj->limit_hops) { 648 if (gwj->limit_hops) {
649 if (nla_put_u8(skb, CGW_LIM_HO 649 if (nla_put_u8(skb, CGW_LIM_HOPS, gwj->limit_hops) < 0)
650 goto cancel; 650 goto cancel;
651 } 651 }
652 652
653 if (gwj->flags & CGW_FLAGS_CAN_FD) { 653 if (gwj->flags & CGW_FLAGS_CAN_FD) {
654 struct cgw_fdframe_mod mb; 654 struct cgw_fdframe_mod mb;
655 655
656 if (gwj->mod.modtype.and) { 656 if (gwj->mod.modtype.and) {
657 memcpy(&mb.cf, &gwj->m 657 memcpy(&mb.cf, &gwj->mod.modframe.and, sizeof(mb.cf));
658 mb.modtype = gwj->mod. 658 mb.modtype = gwj->mod.modtype.and;
659 if (nla_put(skb, CGW_F 659 if (nla_put(skb, CGW_FDMOD_AND, sizeof(mb), &mb) < 0)
660 goto cancel; 660 goto cancel;
661 } 661 }
662 662
663 if (gwj->mod.modtype.or) { 663 if (gwj->mod.modtype.or) {
664 memcpy(&mb.cf, &gwj->m 664 memcpy(&mb.cf, &gwj->mod.modframe.or, sizeof(mb.cf));
665 mb.modtype = gwj->mod. 665 mb.modtype = gwj->mod.modtype.or;
666 if (nla_put(skb, CGW_F 666 if (nla_put(skb, CGW_FDMOD_OR, sizeof(mb), &mb) < 0)
667 goto cancel; 667 goto cancel;
668 } 668 }
669 669
670 if (gwj->mod.modtype.xor) { 670 if (gwj->mod.modtype.xor) {
671 memcpy(&mb.cf, &gwj->m 671 memcpy(&mb.cf, &gwj->mod.modframe.xor, sizeof(mb.cf));
672 mb.modtype = gwj->mod. 672 mb.modtype = gwj->mod.modtype.xor;
673 if (nla_put(skb, CGW_F 673 if (nla_put(skb, CGW_FDMOD_XOR, sizeof(mb), &mb) < 0)
674 goto cancel; 674 goto cancel;
675 } 675 }
676 676
677 if (gwj->mod.modtype.set) { 677 if (gwj->mod.modtype.set) {
678 memcpy(&mb.cf, &gwj->m 678 memcpy(&mb.cf, &gwj->mod.modframe.set, sizeof(mb.cf));
679 mb.modtype = gwj->mod. 679 mb.modtype = gwj->mod.modtype.set;
680 if (nla_put(skb, CGW_F 680 if (nla_put(skb, CGW_FDMOD_SET, sizeof(mb), &mb) < 0)
681 goto cancel; 681 goto cancel;
682 } 682 }
683 } else { 683 } else {
684 struct cgw_frame_mod mb; 684 struct cgw_frame_mod mb;
685 685
686 if (gwj->mod.modtype.and) { 686 if (gwj->mod.modtype.and) {
687 memcpy(&mb.cf, &gwj->m 687 memcpy(&mb.cf, &gwj->mod.modframe.and, sizeof(mb.cf));
688 mb.modtype = gwj->mod. 688 mb.modtype = gwj->mod.modtype.and;
689 if (nla_put(skb, CGW_M 689 if (nla_put(skb, CGW_MOD_AND, sizeof(mb), &mb) < 0)
690 goto cancel; 690 goto cancel;
691 } 691 }
692 692
693 if (gwj->mod.modtype.or) { 693 if (gwj->mod.modtype.or) {
694 memcpy(&mb.cf, &gwj->m 694 memcpy(&mb.cf, &gwj->mod.modframe.or, sizeof(mb.cf));
695 mb.modtype = gwj->mod. 695 mb.modtype = gwj->mod.modtype.or;
696 if (nla_put(skb, CGW_M 696 if (nla_put(skb, CGW_MOD_OR, sizeof(mb), &mb) < 0)
697 goto cancel; 697 goto cancel;
698 } 698 }
699 699
700 if (gwj->mod.modtype.xor) { 700 if (gwj->mod.modtype.xor) {
701 memcpy(&mb.cf, &gwj->m 701 memcpy(&mb.cf, &gwj->mod.modframe.xor, sizeof(mb.cf));
702 mb.modtype = gwj->mod. 702 mb.modtype = gwj->mod.modtype.xor;
703 if (nla_put(skb, CGW_M 703 if (nla_put(skb, CGW_MOD_XOR, sizeof(mb), &mb) < 0)
704 goto cancel; 704 goto cancel;
705 } 705 }
706 706
707 if (gwj->mod.modtype.set) { 707 if (gwj->mod.modtype.set) {
708 memcpy(&mb.cf, &gwj->m 708 memcpy(&mb.cf, &gwj->mod.modframe.set, sizeof(mb.cf));
709 mb.modtype = gwj->mod. 709 mb.modtype = gwj->mod.modtype.set;
710 if (nla_put(skb, CGW_M 710 if (nla_put(skb, CGW_MOD_SET, sizeof(mb), &mb) < 0)
711 goto cancel; 711 goto cancel;
712 } 712 }
713 } 713 }
714 714
715 if (gwj->mod.uid) { 715 if (gwj->mod.uid) {
716 if (nla_put_u32(skb, CGW_MOD_U 716 if (nla_put_u32(skb, CGW_MOD_UID, gwj->mod.uid) < 0)
717 goto cancel; 717 goto cancel;
718 } 718 }
719 719
720 if (gwj->mod.csumfunc.crc8) { 720 if (gwj->mod.csumfunc.crc8) {
721 if (nla_put(skb, CGW_CS_CRC8, 721 if (nla_put(skb, CGW_CS_CRC8, CGW_CS_CRC8_LEN,
722 &gwj->mod.csum.crc 722 &gwj->mod.csum.crc8) < 0)
723 goto cancel; 723 goto cancel;
724 } 724 }
725 725
726 if (gwj->mod.csumfunc.xor) { 726 if (gwj->mod.csumfunc.xor) {
727 if (nla_put(skb, CGW_CS_XOR, C 727 if (nla_put(skb, CGW_CS_XOR, CGW_CS_XOR_LEN,
728 &gwj->mod.csum.xor 728 &gwj->mod.csum.xor) < 0)
729 goto cancel; 729 goto cancel;
730 } 730 }
731 731
732 if (gwj->gwtype == CGW_TYPE_CAN_CAN) { 732 if (gwj->gwtype == CGW_TYPE_CAN_CAN) {
733 if (gwj->ccgw.filter.can_id || 733 if (gwj->ccgw.filter.can_id || gwj->ccgw.filter.can_mask) {
734 if (nla_put(skb, CGW_F 734 if (nla_put(skb, CGW_FILTER, sizeof(struct can_filter),
735 &gwj->ccgw 735 &gwj->ccgw.filter) < 0)
736 goto cancel; 736 goto cancel;
737 } 737 }
738 738
739 if (nla_put_u32(skb, CGW_SRC_I 739 if (nla_put_u32(skb, CGW_SRC_IF, gwj->ccgw.src_idx) < 0)
740 goto cancel; 740 goto cancel;
741 741
742 if (nla_put_u32(skb, CGW_DST_I 742 if (nla_put_u32(skb, CGW_DST_IF, gwj->ccgw.dst_idx) < 0)
743 goto cancel; 743 goto cancel;
744 } 744 }
745 745
746 nlmsg_end(skb, nlh); 746 nlmsg_end(skb, nlh);
747 return 0; 747 return 0;
748 748
749 cancel: 749 cancel:
750 nlmsg_cancel(skb, nlh); 750 nlmsg_cancel(skb, nlh);
751 return -EMSGSIZE; 751 return -EMSGSIZE;
752 } 752 }
753 753
754 /* Dump information about all CAN gateway jobs 754 /* Dump information about all CAN gateway jobs, in response to RTM_GETROUTE */
755 static int cgw_dump_jobs(struct sk_buff *skb, 755 static int cgw_dump_jobs(struct sk_buff *skb, struct netlink_callback *cb)
756 { 756 {
757 struct net *net = sock_net(skb->sk); 757 struct net *net = sock_net(skb->sk);
758 struct cgw_job *gwj = NULL; 758 struct cgw_job *gwj = NULL;
759 int idx = 0; 759 int idx = 0;
760 int s_idx = cb->args[0]; 760 int s_idx = cb->args[0];
761 761
762 rcu_read_lock(); 762 rcu_read_lock();
763 hlist_for_each_entry_rcu(gwj, &net->ca 763 hlist_for_each_entry_rcu(gwj, &net->can.cgw_list, list) {
764 if (idx < s_idx) 764 if (idx < s_idx)
765 goto cont; 765 goto cont;
766 766
767 if (cgw_put_job(skb, gwj, RTM_ 767 if (cgw_put_job(skb, gwj, RTM_NEWROUTE,
768 NETLINK_CB(cb- 768 NETLINK_CB(cb->skb).portid,
769 cb->nlh->nlmsg 769 cb->nlh->nlmsg_seq, NLM_F_MULTI) < 0)
770 break; 770 break;
771 cont: 771 cont:
772 idx++; 772 idx++;
773 } 773 }
774 rcu_read_unlock(); 774 rcu_read_unlock();
775 775
776 cb->args[0] = idx; 776 cb->args[0] = idx;
777 777
778 return skb->len; 778 return skb->len;
779 } 779 }
780 780
781 static const struct nla_policy cgw_policy[CGW_ 781 static const struct nla_policy cgw_policy[CGW_MAX + 1] = {
782 [CGW_MOD_AND] = { .len = sizeof(stru 782 [CGW_MOD_AND] = { .len = sizeof(struct cgw_frame_mod) },
783 [CGW_MOD_OR] = { .len = sizeof(stru 783 [CGW_MOD_OR] = { .len = sizeof(struct cgw_frame_mod) },
784 [CGW_MOD_XOR] = { .len = sizeof(stru 784 [CGW_MOD_XOR] = { .len = sizeof(struct cgw_frame_mod) },
785 [CGW_MOD_SET] = { .len = sizeof(stru 785 [CGW_MOD_SET] = { .len = sizeof(struct cgw_frame_mod) },
786 [CGW_CS_XOR] = { .len = sizeof(stru 786 [CGW_CS_XOR] = { .len = sizeof(struct cgw_csum_xor) },
787 [CGW_CS_CRC8] = { .len = sizeof(stru 787 [CGW_CS_CRC8] = { .len = sizeof(struct cgw_csum_crc8) },
788 [CGW_SRC_IF] = { .type = NLA_U32 }, 788 [CGW_SRC_IF] = { .type = NLA_U32 },
789 [CGW_DST_IF] = { .type = NLA_U32 }, 789 [CGW_DST_IF] = { .type = NLA_U32 },
790 [CGW_FILTER] = { .len = sizeof(stru 790 [CGW_FILTER] = { .len = sizeof(struct can_filter) },
791 [CGW_LIM_HOPS] = { .type = NLA_U8 }, 791 [CGW_LIM_HOPS] = { .type = NLA_U8 },
792 [CGW_MOD_UID] = { .type = NLA_U32 }, 792 [CGW_MOD_UID] = { .type = NLA_U32 },
793 [CGW_FDMOD_AND] = { .len = sizeof(stru 793 [CGW_FDMOD_AND] = { .len = sizeof(struct cgw_fdframe_mod) },
794 [CGW_FDMOD_OR] = { .len = sizeof(stru 794 [CGW_FDMOD_OR] = { .len = sizeof(struct cgw_fdframe_mod) },
795 [CGW_FDMOD_XOR] = { .len = sizeof(stru 795 [CGW_FDMOD_XOR] = { .len = sizeof(struct cgw_fdframe_mod) },
796 [CGW_FDMOD_SET] = { .len = sizeof(stru 796 [CGW_FDMOD_SET] = { .len = sizeof(struct cgw_fdframe_mod) },
797 }; 797 };
798 798
799 /* check for common and gwtype specific attrib 799 /* check for common and gwtype specific attributes */
800 static int cgw_parse_attr(struct nlmsghdr *nlh 800 static int cgw_parse_attr(struct nlmsghdr *nlh, struct cf_mod *mod,
801 u8 gwtype, void *gwt 801 u8 gwtype, void *gwtypeattr, u8 *limhops)
802 { 802 {
803 struct nlattr *tb[CGW_MAX + 1]; 803 struct nlattr *tb[CGW_MAX + 1];
804 struct rtcanmsg *r = nlmsg_data(nlh); 804 struct rtcanmsg *r = nlmsg_data(nlh);
805 int modidx = 0; 805 int modidx = 0;
806 int err = 0; 806 int err = 0;
807 807
808 /* initialize modification & checksum 808 /* initialize modification & checksum data space */
809 memset(mod, 0, sizeof(*mod)); 809 memset(mod, 0, sizeof(*mod));
810 810
811 err = nlmsg_parse_deprecated(nlh, size 811 err = nlmsg_parse_deprecated(nlh, sizeof(struct rtcanmsg), tb,
812 CGW_MAX, 812 CGW_MAX, cgw_policy, NULL);
813 if (err < 0) 813 if (err < 0)
814 return err; 814 return err;
815 815
816 if (tb[CGW_LIM_HOPS]) { 816 if (tb[CGW_LIM_HOPS]) {
817 *limhops = nla_get_u8(tb[CGW_L 817 *limhops = nla_get_u8(tb[CGW_LIM_HOPS]);
818 818
819 if (*limhops < 1 || *limhops > 819 if (*limhops < 1 || *limhops > max_hops)
820 return -EINVAL; 820 return -EINVAL;
821 } 821 }
822 822
823 /* check for AND/OR/XOR/SET modificati 823 /* check for AND/OR/XOR/SET modifications */
824 if (r->flags & CGW_FLAGS_CAN_FD) { 824 if (r->flags & CGW_FLAGS_CAN_FD) {
825 struct cgw_fdframe_mod mb; 825 struct cgw_fdframe_mod mb;
826 826
827 if (tb[CGW_FDMOD_AND]) { 827 if (tb[CGW_FDMOD_AND]) {
828 nla_memcpy(&mb, tb[CGW 828 nla_memcpy(&mb, tb[CGW_FDMOD_AND], CGW_FDMODATTR_LEN);
829 829
830 canfdframecpy(&mod->mo 830 canfdframecpy(&mod->modframe.and, &mb.cf);
831 mod->modtype.and = mb. 831 mod->modtype.and = mb.modtype;
832 832
833 if (mb.modtype & CGW_M 833 if (mb.modtype & CGW_MOD_ID)
834 mod->modfunc[m 834 mod->modfunc[modidx++] = mod_and_id;
835 835
836 if (mb.modtype & CGW_M 836 if (mb.modtype & CGW_MOD_LEN)
837 mod->modfunc[m 837 mod->modfunc[modidx++] = mod_and_len;
838 838
839 if (mb.modtype & CGW_M 839 if (mb.modtype & CGW_MOD_FLAGS)
840 mod->modfunc[m 840 mod->modfunc[modidx++] = mod_and_flags;
841 841
842 if (mb.modtype & CGW_M 842 if (mb.modtype & CGW_MOD_DATA)
843 mod->modfunc[m 843 mod->modfunc[modidx++] = mod_and_fddata;
844 } 844 }
845 845
846 if (tb[CGW_FDMOD_OR]) { 846 if (tb[CGW_FDMOD_OR]) {
847 nla_memcpy(&mb, tb[CGW 847 nla_memcpy(&mb, tb[CGW_FDMOD_OR], CGW_FDMODATTR_LEN);
848 848
849 canfdframecpy(&mod->mo 849 canfdframecpy(&mod->modframe.or, &mb.cf);
850 mod->modtype.or = mb.m 850 mod->modtype.or = mb.modtype;
851 851
852 if (mb.modtype & CGW_M 852 if (mb.modtype & CGW_MOD_ID)
853 mod->modfunc[m 853 mod->modfunc[modidx++] = mod_or_id;
854 854
855 if (mb.modtype & CGW_M 855 if (mb.modtype & CGW_MOD_LEN)
856 mod->modfunc[m 856 mod->modfunc[modidx++] = mod_or_len;
857 857
858 if (mb.modtype & CGW_M 858 if (mb.modtype & CGW_MOD_FLAGS)
859 mod->modfunc[m 859 mod->modfunc[modidx++] = mod_or_flags;
860 860
861 if (mb.modtype & CGW_M 861 if (mb.modtype & CGW_MOD_DATA)
862 mod->modfunc[m 862 mod->modfunc[modidx++] = mod_or_fddata;
863 } 863 }
864 864
865 if (tb[CGW_FDMOD_XOR]) { 865 if (tb[CGW_FDMOD_XOR]) {
866 nla_memcpy(&mb, tb[CGW 866 nla_memcpy(&mb, tb[CGW_FDMOD_XOR], CGW_FDMODATTR_LEN);
867 867
868 canfdframecpy(&mod->mo 868 canfdframecpy(&mod->modframe.xor, &mb.cf);
869 mod->modtype.xor = mb. 869 mod->modtype.xor = mb.modtype;
870 870
871 if (mb.modtype & CGW_M 871 if (mb.modtype & CGW_MOD_ID)
872 mod->modfunc[m 872 mod->modfunc[modidx++] = mod_xor_id;
873 873
874 if (mb.modtype & CGW_M 874 if (mb.modtype & CGW_MOD_LEN)
875 mod->modfunc[m 875 mod->modfunc[modidx++] = mod_xor_len;
876 876
877 if (mb.modtype & CGW_M 877 if (mb.modtype & CGW_MOD_FLAGS)
878 mod->modfunc[m 878 mod->modfunc[modidx++] = mod_xor_flags;
879 879
880 if (mb.modtype & CGW_M 880 if (mb.modtype & CGW_MOD_DATA)
881 mod->modfunc[m 881 mod->modfunc[modidx++] = mod_xor_fddata;
882 } 882 }
883 883
884 if (tb[CGW_FDMOD_SET]) { 884 if (tb[CGW_FDMOD_SET]) {
885 nla_memcpy(&mb, tb[CGW 885 nla_memcpy(&mb, tb[CGW_FDMOD_SET], CGW_FDMODATTR_LEN);
886 886
887 canfdframecpy(&mod->mo 887 canfdframecpy(&mod->modframe.set, &mb.cf);
888 mod->modtype.set = mb. 888 mod->modtype.set = mb.modtype;
889 889
890 if (mb.modtype & CGW_M 890 if (mb.modtype & CGW_MOD_ID)
891 mod->modfunc[m 891 mod->modfunc[modidx++] = mod_set_id;
892 892
893 if (mb.modtype & CGW_M 893 if (mb.modtype & CGW_MOD_LEN)
894 mod->modfunc[m 894 mod->modfunc[modidx++] = mod_set_len;
895 895
896 if (mb.modtype & CGW_M 896 if (mb.modtype & CGW_MOD_FLAGS)
897 mod->modfunc[m 897 mod->modfunc[modidx++] = mod_set_flags;
898 898
899 if (mb.modtype & CGW_M 899 if (mb.modtype & CGW_MOD_DATA)
900 mod->modfunc[m 900 mod->modfunc[modidx++] = mod_set_fddata;
901 } 901 }
902 } else { 902 } else {
903 struct cgw_frame_mod mb; 903 struct cgw_frame_mod mb;
904 904
905 if (tb[CGW_MOD_AND]) { 905 if (tb[CGW_MOD_AND]) {
906 nla_memcpy(&mb, tb[CGW 906 nla_memcpy(&mb, tb[CGW_MOD_AND], CGW_MODATTR_LEN);
907 907
908 canframecpy(&mod->modf 908 canframecpy(&mod->modframe.and, &mb.cf);
909 mod->modtype.and = mb. 909 mod->modtype.and = mb.modtype;
910 910
911 if (mb.modtype & CGW_M 911 if (mb.modtype & CGW_MOD_ID)
912 mod->modfunc[m 912 mod->modfunc[modidx++] = mod_and_id;
913 913
914 if (mb.modtype & CGW_M 914 if (mb.modtype & CGW_MOD_DLC)
915 mod->modfunc[m 915 mod->modfunc[modidx++] = mod_and_ccdlc;
916 916
917 if (mb.modtype & CGW_M 917 if (mb.modtype & CGW_MOD_DATA)
918 mod->modfunc[m 918 mod->modfunc[modidx++] = mod_and_data;
919 } 919 }
920 920
921 if (tb[CGW_MOD_OR]) { 921 if (tb[CGW_MOD_OR]) {
922 nla_memcpy(&mb, tb[CGW 922 nla_memcpy(&mb, tb[CGW_MOD_OR], CGW_MODATTR_LEN);
923 923
924 canframecpy(&mod->modf 924 canframecpy(&mod->modframe.or, &mb.cf);
925 mod->modtype.or = mb.m 925 mod->modtype.or = mb.modtype;
926 926
927 if (mb.modtype & CGW_M 927 if (mb.modtype & CGW_MOD_ID)
928 mod->modfunc[m 928 mod->modfunc[modidx++] = mod_or_id;
929 929
930 if (mb.modtype & CGW_M 930 if (mb.modtype & CGW_MOD_DLC)
931 mod->modfunc[m 931 mod->modfunc[modidx++] = mod_or_ccdlc;
932 932
933 if (mb.modtype & CGW_M 933 if (mb.modtype & CGW_MOD_DATA)
934 mod->modfunc[m 934 mod->modfunc[modidx++] = mod_or_data;
935 } 935 }
936 936
937 if (tb[CGW_MOD_XOR]) { 937 if (tb[CGW_MOD_XOR]) {
938 nla_memcpy(&mb, tb[CGW 938 nla_memcpy(&mb, tb[CGW_MOD_XOR], CGW_MODATTR_LEN);
939 939
940 canframecpy(&mod->modf 940 canframecpy(&mod->modframe.xor, &mb.cf);
941 mod->modtype.xor = mb. 941 mod->modtype.xor = mb.modtype;
942 942
943 if (mb.modtype & CGW_M 943 if (mb.modtype & CGW_MOD_ID)
944 mod->modfunc[m 944 mod->modfunc[modidx++] = mod_xor_id;
945 945
946 if (mb.modtype & CGW_M 946 if (mb.modtype & CGW_MOD_DLC)
947 mod->modfunc[m 947 mod->modfunc[modidx++] = mod_xor_ccdlc;
948 948
949 if (mb.modtype & CGW_M 949 if (mb.modtype & CGW_MOD_DATA)
950 mod->modfunc[m 950 mod->modfunc[modidx++] = mod_xor_data;
951 } 951 }
952 952
953 if (tb[CGW_MOD_SET]) { 953 if (tb[CGW_MOD_SET]) {
954 nla_memcpy(&mb, tb[CGW 954 nla_memcpy(&mb, tb[CGW_MOD_SET], CGW_MODATTR_LEN);
955 955
956 canframecpy(&mod->modf 956 canframecpy(&mod->modframe.set, &mb.cf);
957 mod->modtype.set = mb. 957 mod->modtype.set = mb.modtype;
958 958
959 if (mb.modtype & CGW_M 959 if (mb.modtype & CGW_MOD_ID)
960 mod->modfunc[m 960 mod->modfunc[modidx++] = mod_set_id;
961 961
962 if (mb.modtype & CGW_M 962 if (mb.modtype & CGW_MOD_DLC)
963 mod->modfunc[m 963 mod->modfunc[modidx++] = mod_set_ccdlc;
964 964
965 if (mb.modtype & CGW_M 965 if (mb.modtype & CGW_MOD_DATA)
966 mod->modfunc[m 966 mod->modfunc[modidx++] = mod_set_data;
967 } 967 }
968 } 968 }
969 969
970 /* check for checksum operations after 970 /* check for checksum operations after CAN frame modifications */
971 if (modidx) { 971 if (modidx) {
972 if (tb[CGW_CS_CRC8]) { 972 if (tb[CGW_CS_CRC8]) {
973 struct cgw_csum_crc8 * 973 struct cgw_csum_crc8 *c = nla_data(tb[CGW_CS_CRC8]);
974 974
975 err = cgw_chk_csum_par 975 err = cgw_chk_csum_parms(c->from_idx, c->to_idx,
976 976 c->result_idx, r);
977 if (err) 977 if (err)
978 return err; 978 return err;
979 979
980 nla_memcpy(&mod->csum. 980 nla_memcpy(&mod->csum.crc8, tb[CGW_CS_CRC8],
981 CGW_CS_CRC8 981 CGW_CS_CRC8_LEN);
982 982
983 /* select dedicated pr 983 /* select dedicated processing function to reduce
984 * runtime operations 984 * runtime operations in receive hot path.
985 */ 985 */
986 if (c->from_idx < 0 || 986 if (c->from_idx < 0 || c->to_idx < 0 ||
987 c->result_idx < 0) 987 c->result_idx < 0)
988 mod->csumfunc. 988 mod->csumfunc.crc8 = cgw_csum_crc8_rel;
989 else if (c->from_idx < 989 else if (c->from_idx <= c->to_idx)
990 mod->csumfunc. 990 mod->csumfunc.crc8 = cgw_csum_crc8_pos;
991 else 991 else
992 mod->csumfunc. 992 mod->csumfunc.crc8 = cgw_csum_crc8_neg;
993 } 993 }
994 994
995 if (tb[CGW_CS_XOR]) { 995 if (tb[CGW_CS_XOR]) {
996 struct cgw_csum_xor *c 996 struct cgw_csum_xor *c = nla_data(tb[CGW_CS_XOR]);
997 997
998 err = cgw_chk_csum_par 998 err = cgw_chk_csum_parms(c->from_idx, c->to_idx,
999 999 c->result_idx, r);
1000 if (err) 1000 if (err)
1001 return err; 1001 return err;
1002 1002
1003 nla_memcpy(&mod->csum 1003 nla_memcpy(&mod->csum.xor, tb[CGW_CS_XOR],
1004 CGW_CS_XOR 1004 CGW_CS_XOR_LEN);
1005 1005
1006 /* select dedicated p 1006 /* select dedicated processing function to reduce
1007 * runtime operations 1007 * runtime operations in receive hot path.
1008 */ 1008 */
1009 if (c->from_idx < 0 | 1009 if (c->from_idx < 0 || c->to_idx < 0 ||
1010 c->result_idx < 0 1010 c->result_idx < 0)
1011 mod->csumfunc 1011 mod->csumfunc.xor = cgw_csum_xor_rel;
1012 else if (c->from_idx 1012 else if (c->from_idx <= c->to_idx)
1013 mod->csumfunc 1013 mod->csumfunc.xor = cgw_csum_xor_pos;
1014 else 1014 else
1015 mod->csumfunc 1015 mod->csumfunc.xor = cgw_csum_xor_neg;
1016 } 1016 }
1017 1017
1018 if (tb[CGW_MOD_UID]) 1018 if (tb[CGW_MOD_UID])
1019 nla_memcpy(&mod->uid, 1019 nla_memcpy(&mod->uid, tb[CGW_MOD_UID], sizeof(u32));
1020 } 1020 }
1021 1021
1022 if (gwtype == CGW_TYPE_CAN_CAN) { 1022 if (gwtype == CGW_TYPE_CAN_CAN) {
1023 /* check CGW_TYPE_CAN_CAN spe 1023 /* check CGW_TYPE_CAN_CAN specific attributes */
1024 struct can_can_gw *ccgw = (st 1024 struct can_can_gw *ccgw = (struct can_can_gw *)gwtypeattr;
1025 1025
1026 memset(ccgw, 0, sizeof(*ccgw) 1026 memset(ccgw, 0, sizeof(*ccgw));
1027 1027
1028 /* check for can_filter in at 1028 /* check for can_filter in attributes */
1029 if (tb[CGW_FILTER]) 1029 if (tb[CGW_FILTER])
1030 nla_memcpy(&ccgw->fil 1030 nla_memcpy(&ccgw->filter, tb[CGW_FILTER],
1031 sizeof(str 1031 sizeof(struct can_filter));
1032 1032
1033 err = -ENODEV; 1033 err = -ENODEV;
1034 1034
1035 /* specifying two interfaces 1035 /* specifying two interfaces is mandatory */
1036 if (!tb[CGW_SRC_IF] || !tb[CG 1036 if (!tb[CGW_SRC_IF] || !tb[CGW_DST_IF])
1037 return err; 1037 return err;
1038 1038
1039 ccgw->src_idx = nla_get_u32(t 1039 ccgw->src_idx = nla_get_u32(tb[CGW_SRC_IF]);
1040 ccgw->dst_idx = nla_get_u32(t 1040 ccgw->dst_idx = nla_get_u32(tb[CGW_DST_IF]);
1041 1041
1042 /* both indices set to 0 for 1042 /* both indices set to 0 for flushing all routing entries */
1043 if (!ccgw->src_idx && !ccgw-> 1043 if (!ccgw->src_idx && !ccgw->dst_idx)
1044 return 0; 1044 return 0;
1045 1045
1046 /* only one index set to 0 is 1046 /* only one index set to 0 is an error */
1047 if (!ccgw->src_idx || !ccgw-> 1047 if (!ccgw->src_idx || !ccgw->dst_idx)
1048 return err; 1048 return err;
1049 } 1049 }
1050 1050
1051 /* add the checks for other gwtypes h 1051 /* add the checks for other gwtypes here */
1052 1052
1053 return 0; 1053 return 0;
1054 } 1054 }
1055 1055
1056 static int cgw_create_job(struct sk_buff *skb 1056 static int cgw_create_job(struct sk_buff *skb, struct nlmsghdr *nlh,
1057 struct netlink_ext_ 1057 struct netlink_ext_ack *extack)
1058 { 1058 {
1059 struct net *net = sock_net(skb->sk); 1059 struct net *net = sock_net(skb->sk);
1060 struct rtcanmsg *r; 1060 struct rtcanmsg *r;
1061 struct cgw_job *gwj; 1061 struct cgw_job *gwj;
1062 struct cf_mod mod; 1062 struct cf_mod mod;
1063 struct can_can_gw ccgw; 1063 struct can_can_gw ccgw;
1064 u8 limhops = 0; 1064 u8 limhops = 0;
1065 int err = 0; 1065 int err = 0;
1066 1066
1067 if (!netlink_capable(skb, CAP_NET_ADM 1067 if (!netlink_capable(skb, CAP_NET_ADMIN))
1068 return -EPERM; 1068 return -EPERM;
1069 1069
1070 if (nlmsg_len(nlh) < sizeof(*r)) 1070 if (nlmsg_len(nlh) < sizeof(*r))
1071 return -EINVAL; 1071 return -EINVAL;
1072 1072
1073 r = nlmsg_data(nlh); 1073 r = nlmsg_data(nlh);
1074 if (r->can_family != AF_CAN) 1074 if (r->can_family != AF_CAN)
1075 return -EPFNOSUPPORT; 1075 return -EPFNOSUPPORT;
1076 1076
1077 /* so far we only support CAN -> CAN 1077 /* so far we only support CAN -> CAN routings */
1078 if (r->gwtype != CGW_TYPE_CAN_CAN) 1078 if (r->gwtype != CGW_TYPE_CAN_CAN)
1079 return -EINVAL; 1079 return -EINVAL;
1080 1080
1081 err = cgw_parse_attr(nlh, &mod, CGW_T 1081 err = cgw_parse_attr(nlh, &mod, CGW_TYPE_CAN_CAN, &ccgw, &limhops);
1082 if (err < 0) 1082 if (err < 0)
1083 return err; 1083 return err;
1084 1084
1085 if (mod.uid) { 1085 if (mod.uid) {
1086 ASSERT_RTNL(); 1086 ASSERT_RTNL();
1087 1087
1088 /* check for updating an exis 1088 /* check for updating an existing job with identical uid */
1089 hlist_for_each_entry(gwj, &ne 1089 hlist_for_each_entry(gwj, &net->can.cgw_list, list) {
1090 if (gwj->mod.uid != m 1090 if (gwj->mod.uid != mod.uid)
1091 continue; 1091 continue;
1092 1092
1093 /* interfaces & filte 1093 /* interfaces & filters must be identical */
1094 if (memcmp(&gwj->ccgw 1094 if (memcmp(&gwj->ccgw, &ccgw, sizeof(ccgw)))
1095 return -EINVA 1095 return -EINVAL;
1096 1096
1097 /* update modificatio 1097 /* update modifications with disabled softirq & quit */
1098 local_bh_disable(); 1098 local_bh_disable();
1099 memcpy(&gwj->mod, &mo 1099 memcpy(&gwj->mod, &mod, sizeof(mod));
1100 local_bh_enable(); 1100 local_bh_enable();
1101 return 0; 1101 return 0;
1102 } 1102 }
1103 } 1103 }
1104 1104
1105 /* ifindex == 0 is not allowed for jo 1105 /* ifindex == 0 is not allowed for job creation */
1106 if (!ccgw.src_idx || !ccgw.dst_idx) 1106 if (!ccgw.src_idx || !ccgw.dst_idx)
1107 return -ENODEV; 1107 return -ENODEV;
1108 1108
1109 gwj = kmem_cache_alloc(cgw_cache, GFP 1109 gwj = kmem_cache_alloc(cgw_cache, GFP_KERNEL);
1110 if (!gwj) 1110 if (!gwj)
1111 return -ENOMEM; 1111 return -ENOMEM;
1112 1112
1113 gwj->handled_frames = 0; 1113 gwj->handled_frames = 0;
1114 gwj->dropped_frames = 0; 1114 gwj->dropped_frames = 0;
1115 gwj->deleted_frames = 0; 1115 gwj->deleted_frames = 0;
1116 gwj->flags = r->flags; 1116 gwj->flags = r->flags;
1117 gwj->gwtype = r->gwtype; 1117 gwj->gwtype = r->gwtype;
1118 gwj->limit_hops = limhops; 1118 gwj->limit_hops = limhops;
1119 1119
1120 /* insert already parsed information 1120 /* insert already parsed information */
1121 memcpy(&gwj->mod, &mod, sizeof(mod)); 1121 memcpy(&gwj->mod, &mod, sizeof(mod));
1122 memcpy(&gwj->ccgw, &ccgw, sizeof(ccgw 1122 memcpy(&gwj->ccgw, &ccgw, sizeof(ccgw));
1123 1123
1124 err = -ENODEV; 1124 err = -ENODEV;
1125 1125
1126 gwj->src.dev = __dev_get_by_index(net 1126 gwj->src.dev = __dev_get_by_index(net, gwj->ccgw.src_idx);
1127 1127
1128 if (!gwj->src.dev) 1128 if (!gwj->src.dev)
1129 goto out; 1129 goto out;
1130 1130
1131 if (gwj->src.dev->type != ARPHRD_CAN) 1131 if (gwj->src.dev->type != ARPHRD_CAN)
1132 goto out; 1132 goto out;
1133 1133
1134 gwj->dst.dev = __dev_get_by_index(net 1134 gwj->dst.dev = __dev_get_by_index(net, gwj->ccgw.dst_idx);
1135 1135
1136 if (!gwj->dst.dev) 1136 if (!gwj->dst.dev)
1137 goto out; 1137 goto out;
1138 1138
1139 if (gwj->dst.dev->type != ARPHRD_CAN) 1139 if (gwj->dst.dev->type != ARPHRD_CAN)
1140 goto out; 1140 goto out;
1141 1141
1142 /* is sending the skb back to the inc <<
1143 if (gwj->src.dev == gwj->dst.dev && <<
1144 !(gwj->flags & CGW_FLAGS_CAN_IIF_ <<
1145 err = -EINVAL; <<
1146 goto out; <<
1147 } <<
1148 <<
1149 ASSERT_RTNL(); 1142 ASSERT_RTNL();
1150 1143
1151 err = cgw_register_filter(net, gwj); 1144 err = cgw_register_filter(net, gwj);
1152 if (!err) 1145 if (!err)
1153 hlist_add_head_rcu(&gwj->list 1146 hlist_add_head_rcu(&gwj->list, &net->can.cgw_list);
1154 out: 1147 out:
1155 if (err) 1148 if (err)
1156 kmem_cache_free(cgw_cache, gw 1149 kmem_cache_free(cgw_cache, gwj);
1157 1150
1158 return err; 1151 return err;
1159 } 1152 }
1160 1153
1161 static void cgw_remove_all_jobs(struct net *n 1154 static void cgw_remove_all_jobs(struct net *net)
1162 { 1155 {
1163 struct cgw_job *gwj = NULL; 1156 struct cgw_job *gwj = NULL;
1164 struct hlist_node *nx; 1157 struct hlist_node *nx;
1165 1158
1166 ASSERT_RTNL(); 1159 ASSERT_RTNL();
1167 1160
1168 hlist_for_each_entry_safe(gwj, nx, &n 1161 hlist_for_each_entry_safe(gwj, nx, &net->can.cgw_list, list) {
1169 hlist_del(&gwj->list); 1162 hlist_del(&gwj->list);
1170 cgw_unregister_filter(net, gw 1163 cgw_unregister_filter(net, gwj);
1171 call_rcu(&gwj->rcu, cgw_job_f 1164 call_rcu(&gwj->rcu, cgw_job_free_rcu);
1172 } 1165 }
1173 } 1166 }
1174 1167
1175 static int cgw_remove_job(struct sk_buff *skb 1168 static int cgw_remove_job(struct sk_buff *skb, struct nlmsghdr *nlh,
1176 struct netlink_ext_ 1169 struct netlink_ext_ack *extack)
1177 { 1170 {
1178 struct net *net = sock_net(skb->sk); 1171 struct net *net = sock_net(skb->sk);
1179 struct cgw_job *gwj = NULL; 1172 struct cgw_job *gwj = NULL;
1180 struct hlist_node *nx; 1173 struct hlist_node *nx;
1181 struct rtcanmsg *r; 1174 struct rtcanmsg *r;
1182 struct cf_mod mod; 1175 struct cf_mod mod;
1183 struct can_can_gw ccgw; 1176 struct can_can_gw ccgw;
1184 u8 limhops = 0; 1177 u8 limhops = 0;
1185 int err = 0; 1178 int err = 0;
1186 1179
1187 if (!netlink_capable(skb, CAP_NET_ADM 1180 if (!netlink_capable(skb, CAP_NET_ADMIN))
1188 return -EPERM; 1181 return -EPERM;
1189 1182
1190 if (nlmsg_len(nlh) < sizeof(*r)) 1183 if (nlmsg_len(nlh) < sizeof(*r))
1191 return -EINVAL; 1184 return -EINVAL;
1192 1185
1193 r = nlmsg_data(nlh); 1186 r = nlmsg_data(nlh);
1194 if (r->can_family != AF_CAN) 1187 if (r->can_family != AF_CAN)
1195 return -EPFNOSUPPORT; 1188 return -EPFNOSUPPORT;
1196 1189
1197 /* so far we only support CAN -> CAN 1190 /* so far we only support CAN -> CAN routings */
1198 if (r->gwtype != CGW_TYPE_CAN_CAN) 1191 if (r->gwtype != CGW_TYPE_CAN_CAN)
1199 return -EINVAL; 1192 return -EINVAL;
1200 1193
1201 err = cgw_parse_attr(nlh, &mod, CGW_T 1194 err = cgw_parse_attr(nlh, &mod, CGW_TYPE_CAN_CAN, &ccgw, &limhops);
1202 if (err < 0) 1195 if (err < 0)
1203 return err; 1196 return err;
1204 1197
1205 /* two interface indices both set to 1198 /* two interface indices both set to 0 => remove all entries */
1206 if (!ccgw.src_idx && !ccgw.dst_idx) { 1199 if (!ccgw.src_idx && !ccgw.dst_idx) {
1207 cgw_remove_all_jobs(net); 1200 cgw_remove_all_jobs(net);
1208 return 0; 1201 return 0;
1209 } 1202 }
1210 1203
1211 err = -EINVAL; 1204 err = -EINVAL;
1212 1205
1213 ASSERT_RTNL(); 1206 ASSERT_RTNL();
1214 1207
1215 /* remove only the first matching ent 1208 /* remove only the first matching entry */
1216 hlist_for_each_entry_safe(gwj, nx, &n 1209 hlist_for_each_entry_safe(gwj, nx, &net->can.cgw_list, list) {
1217 if (gwj->flags != r->flags) 1210 if (gwj->flags != r->flags)
1218 continue; 1211 continue;
1219 1212
1220 if (gwj->limit_hops != limhop 1213 if (gwj->limit_hops != limhops)
1221 continue; 1214 continue;
1222 1215
1223 /* we have a match when uid i 1216 /* we have a match when uid is enabled and identical */
1224 if (gwj->mod.uid || mod.uid) 1217 if (gwj->mod.uid || mod.uid) {
1225 if (gwj->mod.uid != m 1218 if (gwj->mod.uid != mod.uid)
1226 continue; 1219 continue;
1227 } else { 1220 } else {
1228 /* no uid => check fo 1221 /* no uid => check for identical modifications */
1229 if (memcmp(&gwj->mod, 1222 if (memcmp(&gwj->mod, &mod, sizeof(mod)))
1230 continue; 1223 continue;
1231 } 1224 }
1232 1225
1233 /* if (r->gwtype == CGW_TYPE_ 1226 /* if (r->gwtype == CGW_TYPE_CAN_CAN) - is made sure here */
1234 if (memcmp(&gwj->ccgw, &ccgw, 1227 if (memcmp(&gwj->ccgw, &ccgw, sizeof(ccgw)))
1235 continue; 1228 continue;
1236 1229
1237 hlist_del(&gwj->list); 1230 hlist_del(&gwj->list);
1238 cgw_unregister_filter(net, gw 1231 cgw_unregister_filter(net, gwj);
1239 call_rcu(&gwj->rcu, cgw_job_f 1232 call_rcu(&gwj->rcu, cgw_job_free_rcu);
1240 err = 0; 1233 err = 0;
1241 break; 1234 break;
1242 } 1235 }
1243 1236
1244 return err; 1237 return err;
1245 } 1238 }
1246 1239
1247 static int __net_init cangw_pernet_init(struc 1240 static int __net_init cangw_pernet_init(struct net *net)
1248 { 1241 {
1249 INIT_HLIST_HEAD(&net->can.cgw_list); 1242 INIT_HLIST_HEAD(&net->can.cgw_list);
1250 return 0; 1243 return 0;
1251 } 1244 }
1252 1245
1253 static void __net_exit cangw_pernet_exit_batc 1246 static void __net_exit cangw_pernet_exit_batch(struct list_head *net_list)
1254 { 1247 {
1255 struct net *net; 1248 struct net *net;
1256 1249
1257 rtnl_lock(); 1250 rtnl_lock();
1258 list_for_each_entry(net, net_list, ex 1251 list_for_each_entry(net, net_list, exit_list)
1259 cgw_remove_all_jobs(net); 1252 cgw_remove_all_jobs(net);
1260 rtnl_unlock(); 1253 rtnl_unlock();
1261 } 1254 }
1262 1255
1263 static struct pernet_operations cangw_pernet_ 1256 static struct pernet_operations cangw_pernet_ops = {
1264 .init = cangw_pernet_init, 1257 .init = cangw_pernet_init,
1265 .exit_batch = cangw_pernet_exit_batch 1258 .exit_batch = cangw_pernet_exit_batch,
1266 }; 1259 };
1267 1260
1268 static __init int cgw_module_init(void) 1261 static __init int cgw_module_init(void)
1269 { 1262 {
1270 int ret; 1263 int ret;
1271 1264
1272 /* sanitize given module parameter */ 1265 /* sanitize given module parameter */
1273 max_hops = clamp_t(unsigned int, max_ 1266 max_hops = clamp_t(unsigned int, max_hops, CGW_MIN_HOPS, CGW_MAX_HOPS);
1274 1267
1275 pr_info("can: netlink gateway - max_h 1268 pr_info("can: netlink gateway - max_hops=%d\n", max_hops);
1276 1269
1277 ret = register_pernet_subsys(&cangw_p 1270 ret = register_pernet_subsys(&cangw_pernet_ops);
1278 if (ret) 1271 if (ret)
1279 return ret; 1272 return ret;
1280 1273
1281 ret = -ENOMEM; 1274 ret = -ENOMEM;
1282 cgw_cache = kmem_cache_create("can_gw 1275 cgw_cache = kmem_cache_create("can_gw", sizeof(struct cgw_job),
1283 0, 0, N 1276 0, 0, NULL);
1284 if (!cgw_cache) 1277 if (!cgw_cache)
1285 goto out_cache_create; 1278 goto out_cache_create;
1286 1279
1287 /* set notifier */ 1280 /* set notifier */
1288 notifier.notifier_call = cgw_notifier 1281 notifier.notifier_call = cgw_notifier;
1289 ret = register_netdevice_notifier(&no 1282 ret = register_netdevice_notifier(¬ifier);
1290 if (ret) 1283 if (ret)
1291 goto out_register_notifier; 1284 goto out_register_notifier;
1292 1285
1293 ret = rtnl_register_module(THIS_MODUL 1286 ret = rtnl_register_module(THIS_MODULE, PF_CAN, RTM_GETROUTE,
1294 NULL, cgw_ 1287 NULL, cgw_dump_jobs, 0);
1295 if (ret) 1288 if (ret)
1296 goto out_rtnl_register1; 1289 goto out_rtnl_register1;
1297 1290
1298 ret = rtnl_register_module(THIS_MODUL 1291 ret = rtnl_register_module(THIS_MODULE, PF_CAN, RTM_NEWROUTE,
1299 cgw_create 1292 cgw_create_job, NULL, 0);
1300 if (ret) 1293 if (ret)
1301 goto out_rtnl_register2; 1294 goto out_rtnl_register2;
1302 ret = rtnl_register_module(THIS_MODUL 1295 ret = rtnl_register_module(THIS_MODULE, PF_CAN, RTM_DELROUTE,
1303 cgw_remove 1296 cgw_remove_job, NULL, 0);
1304 if (ret) 1297 if (ret)
1305 goto out_rtnl_register3; 1298 goto out_rtnl_register3;
1306 1299
1307 return 0; 1300 return 0;
1308 1301
1309 out_rtnl_register3: 1302 out_rtnl_register3:
1310 rtnl_unregister(PF_CAN, RTM_NEWROUTE) 1303 rtnl_unregister(PF_CAN, RTM_NEWROUTE);
1311 out_rtnl_register2: 1304 out_rtnl_register2:
1312 rtnl_unregister(PF_CAN, RTM_GETROUTE) 1305 rtnl_unregister(PF_CAN, RTM_GETROUTE);
1313 out_rtnl_register1: 1306 out_rtnl_register1:
1314 unregister_netdevice_notifier(¬ifi 1307 unregister_netdevice_notifier(¬ifier);
1315 out_register_notifier: 1308 out_register_notifier:
1316 kmem_cache_destroy(cgw_cache); 1309 kmem_cache_destroy(cgw_cache);
1317 out_cache_create: 1310 out_cache_create:
1318 unregister_pernet_subsys(&cangw_perne 1311 unregister_pernet_subsys(&cangw_pernet_ops);
1319 1312
1320 return ret; 1313 return ret;
1321 } 1314 }
1322 1315
1323 static __exit void cgw_module_exit(void) 1316 static __exit void cgw_module_exit(void)
1324 { 1317 {
1325 rtnl_unregister_all(PF_CAN); 1318 rtnl_unregister_all(PF_CAN);
1326 1319
1327 unregister_netdevice_notifier(¬ifi 1320 unregister_netdevice_notifier(¬ifier);
1328 1321
1329 unregister_pernet_subsys(&cangw_perne 1322 unregister_pernet_subsys(&cangw_pernet_ops);
1330 rcu_barrier(); /* Wait for completion 1323 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1331 1324
1332 kmem_cache_destroy(cgw_cache); 1325 kmem_cache_destroy(cgw_cache);
1333 } 1326 }
1334 1327
1335 module_init(cgw_module_init); 1328 module_init(cgw_module_init);
1336 module_exit(cgw_module_exit); 1329 module_exit(cgw_module_exit);
1337 1330
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