1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3- !! 1 // SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) 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_VERSION "20190810"
62 #define CAN_GW_NAME "can-gw" 63 #define CAN_GW_NAME "can-gw"
63 64
64 MODULE_DESCRIPTION("PF_CAN netlink gateway"); 65 MODULE_DESCRIPTION("PF_CAN netlink gateway");
65 MODULE_LICENSE("Dual BSD/GPL"); 66 MODULE_LICENSE("Dual BSD/GPL");
66 MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkop 67 MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>");
67 MODULE_ALIAS(CAN_GW_NAME); 68 MODULE_ALIAS(CAN_GW_NAME);
68 69
69 #define CGW_MIN_HOPS 1 70 #define CGW_MIN_HOPS 1
70 #define CGW_MAX_HOPS 6 71 #define CGW_MAX_HOPS 6
71 #define CGW_DEFAULT_HOPS 1 72 #define CGW_DEFAULT_HOPS 1
72 73
73 static unsigned int max_hops __read_mostly = C 74 static unsigned int max_hops __read_mostly = CGW_DEFAULT_HOPS;
74 module_param(max_hops, uint, 0444); 75 module_param(max_hops, uint, 0444);
75 MODULE_PARM_DESC(max_hops, 76 MODULE_PARM_DESC(max_hops,
76 "maximum " CAN_GW_NAME " rout 77 "maximum " CAN_GW_NAME " routing hops for CAN frames "
77 "(valid values: " __stringify 78 "(valid values: " __stringify(CGW_MIN_HOPS) "-"
78 __stringify(CGW_MAX_HOPS) " h 79 __stringify(CGW_MAX_HOPS) " hops, "
79 "default: " __stringify(CGW_D 80 "default: " __stringify(CGW_DEFAULT_HOPS) ")");
80 81
81 static struct notifier_block notifier; 82 static struct notifier_block notifier;
82 static struct kmem_cache *cgw_cache __read_mos 83 static struct kmem_cache *cgw_cache __read_mostly;
83 84
84 /* structure that contains the (on-the-fly) CA 85 /* structure that contains the (on-the-fly) CAN frame modifications */
85 struct cf_mod { 86 struct cf_mod {
86 struct { 87 struct {
87 struct canfd_frame and; 88 struct canfd_frame and;
88 struct canfd_frame or; 89 struct canfd_frame or;
89 struct canfd_frame xor; 90 struct canfd_frame xor;
90 struct canfd_frame set; 91 struct canfd_frame set;
91 } modframe; 92 } modframe;
92 struct { 93 struct {
93 u8 and; 94 u8 and;
94 u8 or; 95 u8 or;
95 u8 xor; 96 u8 xor;
96 u8 set; 97 u8 set;
97 } modtype; 98 } modtype;
98 void (*modfunc[MAX_MODFUNCTIONS])(stru 99 void (*modfunc[MAX_MODFUNCTIONS])(struct canfd_frame *cf,
99 stru 100 struct cf_mod *mod);
100 101
101 /* CAN frame checksum calculation afte 102 /* CAN frame checksum calculation after CAN frame modifications */
102 struct { 103 struct {
103 struct cgw_csum_xor xor; 104 struct cgw_csum_xor xor;
104 struct cgw_csum_crc8 crc8; 105 struct cgw_csum_crc8 crc8;
105 } csum; 106 } csum;
106 struct { 107 struct {
107 void (*xor)(struct canfd_frame 108 void (*xor)(struct canfd_frame *cf,
108 struct cgw_csum_xo 109 struct cgw_csum_xor *xor);
109 void (*crc8)(struct canfd_fram 110 void (*crc8)(struct canfd_frame *cf,
110 struct cgw_csum_c 111 struct cgw_csum_crc8 *crc8);
111 } csumfunc; 112 } csumfunc;
112 u32 uid; 113 u32 uid;
113 }; 114 };
114 115
115 /* So far we just support CAN -> CAN routing a 116 /* So far we just support CAN -> CAN routing and frame modifications.
116 * 117 *
117 * The internal can_can_gw structure contains 118 * The internal can_can_gw structure contains data and attributes for
118 * a CAN -> CAN gateway job. 119 * a CAN -> CAN gateway job.
119 */ 120 */
120 struct can_can_gw { 121 struct can_can_gw {
121 struct can_filter filter; 122 struct can_filter filter;
122 int src_idx; 123 int src_idx;
123 int dst_idx; 124 int dst_idx;
124 }; 125 };
125 126
126 /* list entry for CAN gateways jobs */ 127 /* list entry for CAN gateways jobs */
127 struct cgw_job { 128 struct cgw_job {
128 struct hlist_node list; 129 struct hlist_node list;
129 struct rcu_head rcu; 130 struct rcu_head rcu;
130 u32 handled_frames; 131 u32 handled_frames;
131 u32 dropped_frames; 132 u32 dropped_frames;
132 u32 deleted_frames; 133 u32 deleted_frames;
133 struct cf_mod mod; 134 struct cf_mod mod;
134 union { 135 union {
135 /* CAN frame data source */ 136 /* CAN frame data source */
136 struct net_device *dev; 137 struct net_device *dev;
137 } src; 138 } src;
138 union { 139 union {
139 /* CAN frame data destination 140 /* CAN frame data destination */
140 struct net_device *dev; 141 struct net_device *dev;
141 } dst; 142 } dst;
142 union { 143 union {
143 struct can_can_gw ccgw; 144 struct can_can_gw ccgw;
144 /* tbc */ 145 /* tbc */
145 }; 146 };
146 u8 gwtype; 147 u8 gwtype;
147 u8 limit_hops; 148 u8 limit_hops;
148 u16 flags; 149 u16 flags;
149 }; 150 };
150 151
151 /* modification functions that are invoked in 152 /* modification functions that are invoked in the hot path in can_can_gw_rcv */
152 153
153 #define MODFUNC(func, op) static void func(str 154 #define MODFUNC(func, op) static void func(struct canfd_frame *cf, \
154 str 155 struct cf_mod *mod) { op ; }
155 156
156 MODFUNC(mod_and_id, cf->can_id &= mod->modfram 157 MODFUNC(mod_and_id, cf->can_id &= mod->modframe.and.can_id)
157 MODFUNC(mod_and_len, cf->len &= mod->modframe. 158 MODFUNC(mod_and_len, cf->len &= mod->modframe.and.len)
158 MODFUNC(mod_and_flags, cf->flags &= mod->modfr 159 MODFUNC(mod_and_flags, cf->flags &= mod->modframe.and.flags)
159 MODFUNC(mod_and_data, *(u64 *)cf->data &= *(u6 160 MODFUNC(mod_and_data, *(u64 *)cf->data &= *(u64 *)mod->modframe.and.data)
160 MODFUNC(mod_or_id, cf->can_id |= mod->modframe 161 MODFUNC(mod_or_id, cf->can_id |= mod->modframe.or.can_id)
161 MODFUNC(mod_or_len, cf->len |= mod->modframe.o 162 MODFUNC(mod_or_len, cf->len |= mod->modframe.or.len)
162 MODFUNC(mod_or_flags, cf->flags |= mod->modfra 163 MODFUNC(mod_or_flags, cf->flags |= mod->modframe.or.flags)
163 MODFUNC(mod_or_data, *(u64 *)cf->data |= *(u64 164 MODFUNC(mod_or_data, *(u64 *)cf->data |= *(u64 *)mod->modframe.or.data)
164 MODFUNC(mod_xor_id, cf->can_id ^= mod->modfram 165 MODFUNC(mod_xor_id, cf->can_id ^= mod->modframe.xor.can_id)
165 MODFUNC(mod_xor_len, cf->len ^= mod->modframe. 166 MODFUNC(mod_xor_len, cf->len ^= mod->modframe.xor.len)
166 MODFUNC(mod_xor_flags, cf->flags ^= mod->modfr 167 MODFUNC(mod_xor_flags, cf->flags ^= mod->modframe.xor.flags)
167 MODFUNC(mod_xor_data, *(u64 *)cf->data ^= *(u6 168 MODFUNC(mod_xor_data, *(u64 *)cf->data ^= *(u64 *)mod->modframe.xor.data)
168 MODFUNC(mod_set_id, cf->can_id = mod->modframe 169 MODFUNC(mod_set_id, cf->can_id = mod->modframe.set.can_id)
169 MODFUNC(mod_set_len, cf->len = mod->modframe.s 170 MODFUNC(mod_set_len, cf->len = mod->modframe.set.len)
170 MODFUNC(mod_set_flags, cf->flags = mod->modfra 171 MODFUNC(mod_set_flags, cf->flags = mod->modframe.set.flags)
171 MODFUNC(mod_set_data, *(u64 *)cf->data = *(u64 172 MODFUNC(mod_set_data, *(u64 *)cf->data = *(u64 *)mod->modframe.set.data)
172 173
173 static void mod_and_fddata(struct canfd_frame 174 static void mod_and_fddata(struct canfd_frame *cf, struct cf_mod *mod)
174 { 175 {
175 int i; 176 int i;
176 177
177 for (i = 0; i < CANFD_MAX_DLEN; i += 8 178 for (i = 0; i < CANFD_MAX_DLEN; i += 8)
178 *(u64 *)(cf->data + i) &= *(u6 179 *(u64 *)(cf->data + i) &= *(u64 *)(mod->modframe.and.data + i);
179 } 180 }
180 181
181 static void mod_or_fddata(struct canfd_frame * 182 static void mod_or_fddata(struct canfd_frame *cf, struct cf_mod *mod)
182 { 183 {
183 int i; 184 int i;
184 185
185 for (i = 0; i < CANFD_MAX_DLEN; i += 8 186 for (i = 0; i < CANFD_MAX_DLEN; i += 8)
186 *(u64 *)(cf->data + i) |= *(u6 187 *(u64 *)(cf->data + i) |= *(u64 *)(mod->modframe.or.data + i);
187 } 188 }
188 189
189 static void mod_xor_fddata(struct canfd_frame 190 static void mod_xor_fddata(struct canfd_frame *cf, struct cf_mod *mod)
190 { 191 {
191 int i; 192 int i;
192 193
193 for (i = 0; i < CANFD_MAX_DLEN; i += 8 194 for (i = 0; i < CANFD_MAX_DLEN; i += 8)
194 *(u64 *)(cf->data + i) ^= *(u6 195 *(u64 *)(cf->data + i) ^= *(u64 *)(mod->modframe.xor.data + i);
195 } 196 }
196 197
197 static void mod_set_fddata(struct canfd_frame 198 static void mod_set_fddata(struct canfd_frame *cf, struct cf_mod *mod)
198 { 199 {
199 memcpy(cf->data, mod->modframe.set.dat 200 memcpy(cf->data, mod->modframe.set.data, CANFD_MAX_DLEN);
200 } 201 }
201 202
202 /* retrieve valid CC DLC value and store it in <<
203 static void mod_retrieve_ccdlc(struct canfd_fr <<
204 { <<
205 struct can_frame *ccf = (struct can_fr <<
206 <<
207 /* len8_dlc is only valid if len == CA <<
208 if (ccf->len != CAN_MAX_DLEN) <<
209 return; <<
210 <<
211 /* do we have a valid len8_dlc value f <<
212 if (ccf->len8_dlc > CAN_MAX_DLEN && cc <<
213 ccf->len = ccf->len8_dlc; <<
214 } <<
215 <<
216 /* convert valid CC DLC value in 'len' into st <<
217 static void mod_store_ccdlc(struct canfd_frame <<
218 { <<
219 struct can_frame *ccf = (struct can_fr <<
220 <<
221 /* clear potential leftovers */ <<
222 ccf->len8_dlc = 0; <<
223 <<
224 /* plain data length 0 .. 8 - that was <<
225 if (ccf->len <= CAN_MAX_DLEN) <<
226 return; <<
227 <<
228 /* potentially broken values are caugh <<
229 if (ccf->len > CAN_MAX_RAW_DLC) <<
230 return; <<
231 <<
232 /* we have a valid dlc value from 9 .. <<
233 ccf->len8_dlc = ccf->len; <<
234 ccf->len = CAN_MAX_DLEN; <<
235 } <<
236 <<
237 static void mod_and_ccdlc(struct canfd_frame * <<
238 { <<
239 mod_retrieve_ccdlc(cf); <<
240 mod_and_len(cf, mod); <<
241 mod_store_ccdlc(cf); <<
242 } <<
243 <<
244 static void mod_or_ccdlc(struct canfd_frame *c <<
245 { <<
246 mod_retrieve_ccdlc(cf); <<
247 mod_or_len(cf, mod); <<
248 mod_store_ccdlc(cf); <<
249 } <<
250 <<
251 static void mod_xor_ccdlc(struct canfd_frame * <<
252 { <<
253 mod_retrieve_ccdlc(cf); <<
254 mod_xor_len(cf, mod); <<
255 mod_store_ccdlc(cf); <<
256 } <<
257 <<
258 static void mod_set_ccdlc(struct canfd_frame * <<
259 { <<
260 mod_set_len(cf, mod); <<
261 mod_store_ccdlc(cf); <<
262 } <<
263 <<
264 static void canframecpy(struct canfd_frame *ds 203 static void canframecpy(struct canfd_frame *dst, struct can_frame *src)
265 { 204 {
266 /* Copy the struct members separately 205 /* Copy the struct members separately to ensure that no uninitialized
267 * data are copied in the 3 bytes hole 206 * data are copied in the 3 bytes hole of the struct. This is needed
268 * to make easy compares of the data i 207 * to make easy compares of the data in the struct cf_mod.
269 */ 208 */
270 209
271 dst->can_id = src->can_id; 210 dst->can_id = src->can_id;
272 dst->len = src->len; !! 211 dst->len = src->can_dlc;
273 *(u64 *)dst->data = *(u64 *)src->data; 212 *(u64 *)dst->data = *(u64 *)src->data;
274 } 213 }
275 214
276 static void canfdframecpy(struct canfd_frame * 215 static void canfdframecpy(struct canfd_frame *dst, struct canfd_frame *src)
277 { 216 {
278 /* Copy the struct members separately 217 /* Copy the struct members separately to ensure that no uninitialized
279 * data are copied in the 2 bytes hole 218 * data are copied in the 2 bytes hole of the struct. This is needed
280 * to make easy compares of the data i 219 * to make easy compares of the data in the struct cf_mod.
281 */ 220 */
282 221
283 dst->can_id = src->can_id; 222 dst->can_id = src->can_id;
284 dst->flags = src->flags; 223 dst->flags = src->flags;
285 dst->len = src->len; 224 dst->len = src->len;
286 memcpy(dst->data, src->data, CANFD_MAX 225 memcpy(dst->data, src->data, CANFD_MAX_DLEN);
287 } 226 }
288 227
289 static int cgw_chk_csum_parms(s8 fr, s8 to, s8 228 static int cgw_chk_csum_parms(s8 fr, s8 to, s8 re, struct rtcanmsg *r)
290 { 229 {
291 s8 dlen = CAN_MAX_DLEN; 230 s8 dlen = CAN_MAX_DLEN;
292 231
293 if (r->flags & CGW_FLAGS_CAN_FD) 232 if (r->flags & CGW_FLAGS_CAN_FD)
294 dlen = CANFD_MAX_DLEN; 233 dlen = CANFD_MAX_DLEN;
295 234
296 /* absolute dlc values 0 .. 7 => 0 .. 235 /* absolute dlc values 0 .. 7 => 0 .. 7, e.g. data [0]
297 * relative to received dlc -1 .. -8 : 236 * relative to received dlc -1 .. -8 :
298 * e.g. for received dlc = 8 237 * e.g. for received dlc = 8
299 * -1 => index = 7 (data[7]) 238 * -1 => index = 7 (data[7])
300 * -3 => index = 5 (data[5]) 239 * -3 => index = 5 (data[5])
301 * -8 => index = 0 (data[0]) 240 * -8 => index = 0 (data[0])
302 */ 241 */
303 242
304 if (fr >= -dlen && fr < dlen && 243 if (fr >= -dlen && fr < dlen &&
305 to >= -dlen && to < dlen && 244 to >= -dlen && to < dlen &&
306 re >= -dlen && re < dlen) 245 re >= -dlen && re < dlen)
307 return 0; 246 return 0;
308 else 247 else
309 return -EINVAL; 248 return -EINVAL;
310 } 249 }
311 250
312 static inline int calc_idx(int idx, int rx_len 251 static inline int calc_idx(int idx, int rx_len)
313 { 252 {
314 if (idx < 0) 253 if (idx < 0)
315 return rx_len + idx; 254 return rx_len + idx;
316 else 255 else
317 return idx; 256 return idx;
318 } 257 }
319 258
320 static void cgw_csum_xor_rel(struct canfd_fram 259 static void cgw_csum_xor_rel(struct canfd_frame *cf, struct cgw_csum_xor *xor)
321 { 260 {
322 int from = calc_idx(xor->from_idx, cf- 261 int from = calc_idx(xor->from_idx, cf->len);
323 int to = calc_idx(xor->to_idx, cf->len 262 int to = calc_idx(xor->to_idx, cf->len);
324 int res = calc_idx(xor->result_idx, cf 263 int res = calc_idx(xor->result_idx, cf->len);
325 u8 val = xor->init_xor_val; 264 u8 val = xor->init_xor_val;
326 int i; 265 int i;
327 266
328 if (from < 0 || to < 0 || res < 0) 267 if (from < 0 || to < 0 || res < 0)
329 return; 268 return;
330 269
331 if (from <= to) { 270 if (from <= to) {
332 for (i = from; i <= to; i++) 271 for (i = from; i <= to; i++)
333 val ^= cf->data[i]; 272 val ^= cf->data[i];
334 } else { 273 } else {
335 for (i = from; i >= to; i--) 274 for (i = from; i >= to; i--)
336 val ^= cf->data[i]; 275 val ^= cf->data[i];
337 } 276 }
338 277
339 cf->data[res] = val; 278 cf->data[res] = val;
340 } 279 }
341 280
342 static void cgw_csum_xor_pos(struct canfd_fram 281 static void cgw_csum_xor_pos(struct canfd_frame *cf, struct cgw_csum_xor *xor)
343 { 282 {
344 u8 val = xor->init_xor_val; 283 u8 val = xor->init_xor_val;
345 int i; 284 int i;
346 285
347 for (i = xor->from_idx; i <= xor->to_i 286 for (i = xor->from_idx; i <= xor->to_idx; i++)
348 val ^= cf->data[i]; 287 val ^= cf->data[i];
349 288
350 cf->data[xor->result_idx] = val; 289 cf->data[xor->result_idx] = val;
351 } 290 }
352 291
353 static void cgw_csum_xor_neg(struct canfd_fram 292 static void cgw_csum_xor_neg(struct canfd_frame *cf, struct cgw_csum_xor *xor)
354 { 293 {
355 u8 val = xor->init_xor_val; 294 u8 val = xor->init_xor_val;
356 int i; 295 int i;
357 296
358 for (i = xor->from_idx; i >= xor->to_i 297 for (i = xor->from_idx; i >= xor->to_idx; i--)
359 val ^= cf->data[i]; 298 val ^= cf->data[i];
360 299
361 cf->data[xor->result_idx] = val; 300 cf->data[xor->result_idx] = val;
362 } 301 }
363 302
364 static void cgw_csum_crc8_rel(struct canfd_fra 303 static void cgw_csum_crc8_rel(struct canfd_frame *cf,
365 struct cgw_csum_ 304 struct cgw_csum_crc8 *crc8)
366 { 305 {
367 int from = calc_idx(crc8->from_idx, cf 306 int from = calc_idx(crc8->from_idx, cf->len);
368 int to = calc_idx(crc8->to_idx, cf->le 307 int to = calc_idx(crc8->to_idx, cf->len);
369 int res = calc_idx(crc8->result_idx, c 308 int res = calc_idx(crc8->result_idx, cf->len);
370 u8 crc = crc8->init_crc_val; 309 u8 crc = crc8->init_crc_val;
371 int i; 310 int i;
372 311
373 if (from < 0 || to < 0 || res < 0) 312 if (from < 0 || to < 0 || res < 0)
374 return; 313 return;
375 314
376 if (from <= to) { 315 if (from <= to) {
377 for (i = crc8->from_idx; i <= 316 for (i = crc8->from_idx; i <= crc8->to_idx; i++)
378 crc = crc8->crctab[crc 317 crc = crc8->crctab[crc ^ cf->data[i]];
379 } else { 318 } else {
380 for (i = crc8->from_idx; i >= 319 for (i = crc8->from_idx; i >= crc8->to_idx; i--)
381 crc = crc8->crctab[crc 320 crc = crc8->crctab[crc ^ cf->data[i]];
382 } 321 }
383 322
384 switch (crc8->profile) { 323 switch (crc8->profile) {
385 case CGW_CRC8PRF_1U8: 324 case CGW_CRC8PRF_1U8:
386 crc = crc8->crctab[crc ^ crc8- 325 crc = crc8->crctab[crc ^ crc8->profile_data[0]];
387 break; 326 break;
388 327
389 case CGW_CRC8PRF_16U8: 328 case CGW_CRC8PRF_16U8:
390 crc = crc8->crctab[crc ^ crc8- 329 crc = crc8->crctab[crc ^ crc8->profile_data[cf->data[1] & 0xF]];
391 break; 330 break;
392 331
393 case CGW_CRC8PRF_SFFID_XOR: 332 case CGW_CRC8PRF_SFFID_XOR:
394 crc = crc8->crctab[crc ^ (cf-> 333 crc = crc8->crctab[crc ^ (cf->can_id & 0xFF) ^
395 (cf->can_id 334 (cf->can_id >> 8 & 0xFF)];
396 break; 335 break;
397 } 336 }
398 337
399 cf->data[crc8->result_idx] = crc ^ crc 338 cf->data[crc8->result_idx] = crc ^ crc8->final_xor_val;
400 } 339 }
401 340
402 static void cgw_csum_crc8_pos(struct canfd_fra 341 static void cgw_csum_crc8_pos(struct canfd_frame *cf,
403 struct cgw_csum_ 342 struct cgw_csum_crc8 *crc8)
404 { 343 {
405 u8 crc = crc8->init_crc_val; 344 u8 crc = crc8->init_crc_val;
406 int i; 345 int i;
407 346
408 for (i = crc8->from_idx; i <= crc8->to 347 for (i = crc8->from_idx; i <= crc8->to_idx; i++)
409 crc = crc8->crctab[crc ^ cf->d 348 crc = crc8->crctab[crc ^ cf->data[i]];
410 349
411 switch (crc8->profile) { 350 switch (crc8->profile) {
412 case CGW_CRC8PRF_1U8: 351 case CGW_CRC8PRF_1U8:
413 crc = crc8->crctab[crc ^ crc8- 352 crc = crc8->crctab[crc ^ crc8->profile_data[0]];
414 break; 353 break;
415 354
416 case CGW_CRC8PRF_16U8: 355 case CGW_CRC8PRF_16U8:
417 crc = crc8->crctab[crc ^ crc8- 356 crc = crc8->crctab[crc ^ crc8->profile_data[cf->data[1] & 0xF]];
418 break; 357 break;
419 358
420 case CGW_CRC8PRF_SFFID_XOR: 359 case CGW_CRC8PRF_SFFID_XOR:
421 crc = crc8->crctab[crc ^ (cf-> 360 crc = crc8->crctab[crc ^ (cf->can_id & 0xFF) ^
422 (cf->can_id 361 (cf->can_id >> 8 & 0xFF)];
423 break; 362 break;
424 } 363 }
425 364
426 cf->data[crc8->result_idx] = crc ^ crc 365 cf->data[crc8->result_idx] = crc ^ crc8->final_xor_val;
427 } 366 }
428 367
429 static void cgw_csum_crc8_neg(struct canfd_fra 368 static void cgw_csum_crc8_neg(struct canfd_frame *cf,
430 struct cgw_csum_ 369 struct cgw_csum_crc8 *crc8)
431 { 370 {
432 u8 crc = crc8->init_crc_val; 371 u8 crc = crc8->init_crc_val;
433 int i; 372 int i;
434 373
435 for (i = crc8->from_idx; i >= crc8->to 374 for (i = crc8->from_idx; i >= crc8->to_idx; i--)
436 crc = crc8->crctab[crc ^ cf->d 375 crc = crc8->crctab[crc ^ cf->data[i]];
437 376
438 switch (crc8->profile) { 377 switch (crc8->profile) {
439 case CGW_CRC8PRF_1U8: 378 case CGW_CRC8PRF_1U8:
440 crc = crc8->crctab[crc ^ crc8- 379 crc = crc8->crctab[crc ^ crc8->profile_data[0]];
441 break; 380 break;
442 381
443 case CGW_CRC8PRF_16U8: 382 case CGW_CRC8PRF_16U8:
444 crc = crc8->crctab[crc ^ crc8- 383 crc = crc8->crctab[crc ^ crc8->profile_data[cf->data[1] & 0xF]];
445 break; 384 break;
446 385
447 case CGW_CRC8PRF_SFFID_XOR: 386 case CGW_CRC8PRF_SFFID_XOR:
448 crc = crc8->crctab[crc ^ (cf-> 387 crc = crc8->crctab[crc ^ (cf->can_id & 0xFF) ^
449 (cf->can_id 388 (cf->can_id >> 8 & 0xFF)];
450 break; 389 break;
451 } 390 }
452 391
453 cf->data[crc8->result_idx] = crc ^ crc 392 cf->data[crc8->result_idx] = crc ^ crc8->final_xor_val;
454 } 393 }
455 394
456 /* the receive & process & send function */ 395 /* the receive & process & send function */
457 static void can_can_gw_rcv(struct sk_buff *skb 396 static void can_can_gw_rcv(struct sk_buff *skb, void *data)
458 { 397 {
459 struct cgw_job *gwj = (struct cgw_job 398 struct cgw_job *gwj = (struct cgw_job *)data;
460 struct canfd_frame *cf; 399 struct canfd_frame *cf;
461 struct sk_buff *nskb; 400 struct sk_buff *nskb;
462 int modidx = 0; 401 int modidx = 0;
463 402
464 /* process strictly Classic CAN or CAN 403 /* process strictly Classic CAN or CAN FD frames */
465 if (gwj->flags & CGW_FLAGS_CAN_FD) { 404 if (gwj->flags & CGW_FLAGS_CAN_FD) {
466 if (!can_is_canfd_skb(skb)) !! 405 if (skb->len != CANFD_MTU)
467 return; 406 return;
468 } else { 407 } else {
469 if (!can_is_can_skb(skb)) !! 408 if (skb->len != CAN_MTU)
470 return; 409 return;
471 } 410 }
472 411
473 /* Do not handle CAN frames routed mor 412 /* Do not handle CAN frames routed more than 'max_hops' times.
474 * In general we should never catch th 413 * In general we should never catch this delimiter which is intended
475 * to cover a misconfiguration protect 414 * to cover a misconfiguration protection (e.g. circular CAN routes).
476 * 415 *
477 * The Controller Area Network control 416 * The Controller Area Network controllers only accept CAN frames with
478 * correct CRCs - which are not visibl 417 * correct CRCs - which are not visible in the controller registers.
479 * According to skbuff.h documentation 418 * According to skbuff.h documentation the csum_start element for IP
480 * checksums is undefined/unused when 419 * checksums is undefined/unused when ip_summed == CHECKSUM_UNNECESSARY.
481 * Only CAN skbs can be processed here 420 * Only CAN skbs can be processed here which already have this property.
482 */ 421 */
483 422
484 #define cgw_hops(skb) ((skb)->csum_start) 423 #define cgw_hops(skb) ((skb)->csum_start)
485 424
486 BUG_ON(skb->ip_summed != CHECKSUM_UNNE 425 BUG_ON(skb->ip_summed != CHECKSUM_UNNECESSARY);
487 426
488 if (cgw_hops(skb) >= max_hops) { 427 if (cgw_hops(skb) >= max_hops) {
489 /* indicate deleted frames due 428 /* indicate deleted frames due to misconfiguration */
490 gwj->deleted_frames++; 429 gwj->deleted_frames++;
491 return; 430 return;
492 } 431 }
493 432
494 if (!(gwj->dst.dev->flags & IFF_UP)) { 433 if (!(gwj->dst.dev->flags & IFF_UP)) {
495 gwj->dropped_frames++; 434 gwj->dropped_frames++;
496 return; 435 return;
497 } 436 }
498 437
499 /* is sending the skb back to the inco 438 /* is sending the skb back to the incoming interface not allowed? */
500 if (!(gwj->flags & CGW_FLAGS_CAN_IIF_T 439 if (!(gwj->flags & CGW_FLAGS_CAN_IIF_TX_OK) &&
501 can_skb_prv(skb)->ifindex == gwj-> 440 can_skb_prv(skb)->ifindex == gwj->dst.dev->ifindex)
502 return; 441 return;
503 442
504 /* clone the given skb, which has not 443 /* clone the given skb, which has not been done in can_rcv()
505 * 444 *
506 * When there is at least one modifica 445 * When there is at least one modification function activated,
507 * we need to copy the skb as we want 446 * we need to copy the skb as we want to modify skb->data.
508 */ 447 */
509 if (gwj->mod.modfunc[0]) 448 if (gwj->mod.modfunc[0])
510 nskb = skb_copy(skb, GFP_ATOMI 449 nskb = skb_copy(skb, GFP_ATOMIC);
511 else 450 else
512 nskb = skb_clone(skb, GFP_ATOM 451 nskb = skb_clone(skb, GFP_ATOMIC);
513 452
514 if (!nskb) { 453 if (!nskb) {
515 gwj->dropped_frames++; 454 gwj->dropped_frames++;
516 return; 455 return;
517 } 456 }
518 457
519 /* put the incremented hop counter in 458 /* put the incremented hop counter in the cloned skb */
520 cgw_hops(nskb) = cgw_hops(skb) + 1; 459 cgw_hops(nskb) = cgw_hops(skb) + 1;
521 460
522 /* first processing of this CAN frame 461 /* first processing of this CAN frame -> adjust to private hop limit */
523 if (gwj->limit_hops && cgw_hops(nskb) 462 if (gwj->limit_hops && cgw_hops(nskb) == 1)
524 cgw_hops(nskb) = max_hops - gw 463 cgw_hops(nskb) = max_hops - gwj->limit_hops + 1;
525 464
526 nskb->dev = gwj->dst.dev; 465 nskb->dev = gwj->dst.dev;
527 466
528 /* pointer to modifiable CAN frame */ 467 /* pointer to modifiable CAN frame */
529 cf = (struct canfd_frame *)nskb->data; 468 cf = (struct canfd_frame *)nskb->data;
530 469
531 /* perform preprocessed modification f 470 /* perform preprocessed modification functions if there are any */
532 while (modidx < MAX_MODFUNCTIONS && gw 471 while (modidx < MAX_MODFUNCTIONS && gwj->mod.modfunc[modidx])
533 (*gwj->mod.modfunc[modidx++])( 472 (*gwj->mod.modfunc[modidx++])(cf, &gwj->mod);
534 473
535 /* Has the CAN frame been modified? */ 474 /* Has the CAN frame been modified? */
536 if (modidx) { 475 if (modidx) {
537 /* get available space for the 476 /* get available space for the processed CAN frame type */
538 int max_len = nskb->len - offs 477 int max_len = nskb->len - offsetof(struct canfd_frame, data);
539 478
540 /* dlc may have changed, make 479 /* dlc may have changed, make sure it fits to the CAN frame */
541 if (cf->len > max_len) { 480 if (cf->len > max_len) {
542 /* delete frame due to 481 /* delete frame due to misconfiguration */
543 gwj->deleted_frames++; 482 gwj->deleted_frames++;
544 kfree_skb(nskb); 483 kfree_skb(nskb);
545 return; 484 return;
546 } 485 }
547 486
548 /* check for checksum updates 487 /* check for checksum updates */
549 if (gwj->mod.csumfunc.crc8) 488 if (gwj->mod.csumfunc.crc8)
550 (*gwj->mod.csumfunc.cr 489 (*gwj->mod.csumfunc.crc8)(cf, &gwj->mod.csum.crc8);
551 490
552 if (gwj->mod.csumfunc.xor) 491 if (gwj->mod.csumfunc.xor)
553 (*gwj->mod.csumfunc.xo 492 (*gwj->mod.csumfunc.xor)(cf, &gwj->mod.csum.xor);
554 } 493 }
555 494
556 /* clear the skb timestamp if not conf 495 /* clear the skb timestamp if not configured the other way */
557 if (!(gwj->flags & CGW_FLAGS_CAN_SRC_T 496 if (!(gwj->flags & CGW_FLAGS_CAN_SRC_TSTAMP))
558 nskb->tstamp = 0; 497 nskb->tstamp = 0;
559 498
560 /* send to netdevice */ 499 /* send to netdevice */
561 if (can_send(nskb, gwj->flags & CGW_FL 500 if (can_send(nskb, gwj->flags & CGW_FLAGS_CAN_ECHO))
562 gwj->dropped_frames++; 501 gwj->dropped_frames++;
563 else 502 else
564 gwj->handled_frames++; 503 gwj->handled_frames++;
565 } 504 }
566 505
567 static inline int cgw_register_filter(struct n 506 static inline int cgw_register_filter(struct net *net, struct cgw_job *gwj)
568 { 507 {
569 return can_rx_register(net, gwj->src.d 508 return can_rx_register(net, gwj->src.dev, gwj->ccgw.filter.can_id,
570 gwj->ccgw.filte 509 gwj->ccgw.filter.can_mask, can_can_gw_rcv,
571 gwj, "gw", NULL 510 gwj, "gw", NULL);
572 } 511 }
573 512
574 static inline void cgw_unregister_filter(struc 513 static inline void cgw_unregister_filter(struct net *net, struct cgw_job *gwj)
575 { 514 {
576 can_rx_unregister(net, gwj->src.dev, g 515 can_rx_unregister(net, gwj->src.dev, gwj->ccgw.filter.can_id,
577 gwj->ccgw.filter.can 516 gwj->ccgw.filter.can_mask, can_can_gw_rcv, gwj);
578 } 517 }
579 518
580 static void cgw_job_free_rcu(struct rcu_head * <<
581 { <<
582 struct cgw_job *gwj = container_of(rcu <<
583 <<
584 kmem_cache_free(cgw_cache, gwj); <<
585 } <<
586 <<
587 static int cgw_notifier(struct notifier_block 519 static int cgw_notifier(struct notifier_block *nb,
588 unsigned long msg, voi 520 unsigned long msg, void *ptr)
589 { 521 {
590 struct net_device *dev = netdev_notifi 522 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
591 struct net *net = dev_net(dev); 523 struct net *net = dev_net(dev);
592 524
593 if (dev->type != ARPHRD_CAN) 525 if (dev->type != ARPHRD_CAN)
594 return NOTIFY_DONE; 526 return NOTIFY_DONE;
595 527
596 if (msg == NETDEV_UNREGISTER) { 528 if (msg == NETDEV_UNREGISTER) {
597 struct cgw_job *gwj = NULL; 529 struct cgw_job *gwj = NULL;
598 struct hlist_node *nx; 530 struct hlist_node *nx;
599 531
600 ASSERT_RTNL(); 532 ASSERT_RTNL();
601 533
602 hlist_for_each_entry_safe(gwj, 534 hlist_for_each_entry_safe(gwj, nx, &net->can.cgw_list, list) {
603 if (gwj->src.dev == de 535 if (gwj->src.dev == dev || gwj->dst.dev == dev) {
604 hlist_del(&gwj 536 hlist_del(&gwj->list);
605 cgw_unregister 537 cgw_unregister_filter(net, gwj);
606 call_rcu(&gwj- !! 538 kmem_cache_free(cgw_cache, gwj);
607 } 539 }
608 } 540 }
609 } 541 }
610 542
611 return NOTIFY_DONE; 543 return NOTIFY_DONE;
612 } 544 }
613 545
614 static int cgw_put_job(struct sk_buff *skb, st 546 static int cgw_put_job(struct sk_buff *skb, struct cgw_job *gwj, int type,
615 u32 pid, u32 seq, int f 547 u32 pid, u32 seq, int flags)
616 { 548 {
617 struct rtcanmsg *rtcan; 549 struct rtcanmsg *rtcan;
618 struct nlmsghdr *nlh; 550 struct nlmsghdr *nlh;
619 551
620 nlh = nlmsg_put(skb, pid, seq, type, s 552 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtcan), flags);
621 if (!nlh) 553 if (!nlh)
622 return -EMSGSIZE; 554 return -EMSGSIZE;
623 555
624 rtcan = nlmsg_data(nlh); 556 rtcan = nlmsg_data(nlh);
625 rtcan->can_family = AF_CAN; 557 rtcan->can_family = AF_CAN;
626 rtcan->gwtype = gwj->gwtype; 558 rtcan->gwtype = gwj->gwtype;
627 rtcan->flags = gwj->flags; 559 rtcan->flags = gwj->flags;
628 560
629 /* add statistics if available */ 561 /* add statistics if available */
630 562
631 if (gwj->handled_frames) { 563 if (gwj->handled_frames) {
632 if (nla_put_u32(skb, CGW_HANDL 564 if (nla_put_u32(skb, CGW_HANDLED, gwj->handled_frames) < 0)
633 goto cancel; 565 goto cancel;
634 } 566 }
635 567
636 if (gwj->dropped_frames) { 568 if (gwj->dropped_frames) {
637 if (nla_put_u32(skb, CGW_DROPP 569 if (nla_put_u32(skb, CGW_DROPPED, gwj->dropped_frames) < 0)
638 goto cancel; 570 goto cancel;
639 } 571 }
640 572
641 if (gwj->deleted_frames) { 573 if (gwj->deleted_frames) {
642 if (nla_put_u32(skb, CGW_DELET 574 if (nla_put_u32(skb, CGW_DELETED, gwj->deleted_frames) < 0)
643 goto cancel; 575 goto cancel;
644 } 576 }
645 577
646 /* check non default settings of attri 578 /* check non default settings of attributes */
647 579
648 if (gwj->limit_hops) { 580 if (gwj->limit_hops) {
649 if (nla_put_u8(skb, CGW_LIM_HO 581 if (nla_put_u8(skb, CGW_LIM_HOPS, gwj->limit_hops) < 0)
650 goto cancel; 582 goto cancel;
651 } 583 }
652 584
653 if (gwj->flags & CGW_FLAGS_CAN_FD) { 585 if (gwj->flags & CGW_FLAGS_CAN_FD) {
654 struct cgw_fdframe_mod mb; 586 struct cgw_fdframe_mod mb;
655 587
656 if (gwj->mod.modtype.and) { 588 if (gwj->mod.modtype.and) {
657 memcpy(&mb.cf, &gwj->m 589 memcpy(&mb.cf, &gwj->mod.modframe.and, sizeof(mb.cf));
658 mb.modtype = gwj->mod. 590 mb.modtype = gwj->mod.modtype.and;
659 if (nla_put(skb, CGW_F 591 if (nla_put(skb, CGW_FDMOD_AND, sizeof(mb), &mb) < 0)
660 goto cancel; 592 goto cancel;
661 } 593 }
662 594
663 if (gwj->mod.modtype.or) { 595 if (gwj->mod.modtype.or) {
664 memcpy(&mb.cf, &gwj->m 596 memcpy(&mb.cf, &gwj->mod.modframe.or, sizeof(mb.cf));
665 mb.modtype = gwj->mod. 597 mb.modtype = gwj->mod.modtype.or;
666 if (nla_put(skb, CGW_F 598 if (nla_put(skb, CGW_FDMOD_OR, sizeof(mb), &mb) < 0)
667 goto cancel; 599 goto cancel;
668 } 600 }
669 601
670 if (gwj->mod.modtype.xor) { 602 if (gwj->mod.modtype.xor) {
671 memcpy(&mb.cf, &gwj->m 603 memcpy(&mb.cf, &gwj->mod.modframe.xor, sizeof(mb.cf));
672 mb.modtype = gwj->mod. 604 mb.modtype = gwj->mod.modtype.xor;
673 if (nla_put(skb, CGW_F 605 if (nla_put(skb, CGW_FDMOD_XOR, sizeof(mb), &mb) < 0)
674 goto cancel; 606 goto cancel;
675 } 607 }
676 608
677 if (gwj->mod.modtype.set) { 609 if (gwj->mod.modtype.set) {
678 memcpy(&mb.cf, &gwj->m 610 memcpy(&mb.cf, &gwj->mod.modframe.set, sizeof(mb.cf));
679 mb.modtype = gwj->mod. 611 mb.modtype = gwj->mod.modtype.set;
680 if (nla_put(skb, CGW_F 612 if (nla_put(skb, CGW_FDMOD_SET, sizeof(mb), &mb) < 0)
681 goto cancel; 613 goto cancel;
682 } 614 }
683 } else { 615 } else {
684 struct cgw_frame_mod mb; 616 struct cgw_frame_mod mb;
685 617
686 if (gwj->mod.modtype.and) { 618 if (gwj->mod.modtype.and) {
687 memcpy(&mb.cf, &gwj->m 619 memcpy(&mb.cf, &gwj->mod.modframe.and, sizeof(mb.cf));
688 mb.modtype = gwj->mod. 620 mb.modtype = gwj->mod.modtype.and;
689 if (nla_put(skb, CGW_M 621 if (nla_put(skb, CGW_MOD_AND, sizeof(mb), &mb) < 0)
690 goto cancel; 622 goto cancel;
691 } 623 }
692 624
693 if (gwj->mod.modtype.or) { 625 if (gwj->mod.modtype.or) {
694 memcpy(&mb.cf, &gwj->m 626 memcpy(&mb.cf, &gwj->mod.modframe.or, sizeof(mb.cf));
695 mb.modtype = gwj->mod. 627 mb.modtype = gwj->mod.modtype.or;
696 if (nla_put(skb, CGW_M 628 if (nla_put(skb, CGW_MOD_OR, sizeof(mb), &mb) < 0)
697 goto cancel; 629 goto cancel;
698 } 630 }
699 631
700 if (gwj->mod.modtype.xor) { 632 if (gwj->mod.modtype.xor) {
701 memcpy(&mb.cf, &gwj->m 633 memcpy(&mb.cf, &gwj->mod.modframe.xor, sizeof(mb.cf));
702 mb.modtype = gwj->mod. 634 mb.modtype = gwj->mod.modtype.xor;
703 if (nla_put(skb, CGW_M 635 if (nla_put(skb, CGW_MOD_XOR, sizeof(mb), &mb) < 0)
704 goto cancel; 636 goto cancel;
705 } 637 }
706 638
707 if (gwj->mod.modtype.set) { 639 if (gwj->mod.modtype.set) {
708 memcpy(&mb.cf, &gwj->m 640 memcpy(&mb.cf, &gwj->mod.modframe.set, sizeof(mb.cf));
709 mb.modtype = gwj->mod. 641 mb.modtype = gwj->mod.modtype.set;
710 if (nla_put(skb, CGW_M 642 if (nla_put(skb, CGW_MOD_SET, sizeof(mb), &mb) < 0)
711 goto cancel; 643 goto cancel;
712 } 644 }
713 } 645 }
714 646
715 if (gwj->mod.uid) { 647 if (gwj->mod.uid) {
716 if (nla_put_u32(skb, CGW_MOD_U 648 if (nla_put_u32(skb, CGW_MOD_UID, gwj->mod.uid) < 0)
717 goto cancel; 649 goto cancel;
718 } 650 }
719 651
720 if (gwj->mod.csumfunc.crc8) { 652 if (gwj->mod.csumfunc.crc8) {
721 if (nla_put(skb, CGW_CS_CRC8, 653 if (nla_put(skb, CGW_CS_CRC8, CGW_CS_CRC8_LEN,
722 &gwj->mod.csum.crc 654 &gwj->mod.csum.crc8) < 0)
723 goto cancel; 655 goto cancel;
724 } 656 }
725 657
726 if (gwj->mod.csumfunc.xor) { 658 if (gwj->mod.csumfunc.xor) {
727 if (nla_put(skb, CGW_CS_XOR, C 659 if (nla_put(skb, CGW_CS_XOR, CGW_CS_XOR_LEN,
728 &gwj->mod.csum.xor 660 &gwj->mod.csum.xor) < 0)
729 goto cancel; 661 goto cancel;
730 } 662 }
731 663
732 if (gwj->gwtype == CGW_TYPE_CAN_CAN) { 664 if (gwj->gwtype == CGW_TYPE_CAN_CAN) {
733 if (gwj->ccgw.filter.can_id || 665 if (gwj->ccgw.filter.can_id || gwj->ccgw.filter.can_mask) {
734 if (nla_put(skb, CGW_F 666 if (nla_put(skb, CGW_FILTER, sizeof(struct can_filter),
735 &gwj->ccgw 667 &gwj->ccgw.filter) < 0)
736 goto cancel; 668 goto cancel;
737 } 669 }
738 670
739 if (nla_put_u32(skb, CGW_SRC_I 671 if (nla_put_u32(skb, CGW_SRC_IF, gwj->ccgw.src_idx) < 0)
740 goto cancel; 672 goto cancel;
741 673
742 if (nla_put_u32(skb, CGW_DST_I 674 if (nla_put_u32(skb, CGW_DST_IF, gwj->ccgw.dst_idx) < 0)
743 goto cancel; 675 goto cancel;
744 } 676 }
745 677
746 nlmsg_end(skb, nlh); 678 nlmsg_end(skb, nlh);
747 return 0; 679 return 0;
748 680
749 cancel: 681 cancel:
750 nlmsg_cancel(skb, nlh); 682 nlmsg_cancel(skb, nlh);
751 return -EMSGSIZE; 683 return -EMSGSIZE;
752 } 684 }
753 685
754 /* Dump information about all CAN gateway jobs 686 /* Dump information about all CAN gateway jobs, in response to RTM_GETROUTE */
755 static int cgw_dump_jobs(struct sk_buff *skb, 687 static int cgw_dump_jobs(struct sk_buff *skb, struct netlink_callback *cb)
756 { 688 {
757 struct net *net = sock_net(skb->sk); 689 struct net *net = sock_net(skb->sk);
758 struct cgw_job *gwj = NULL; 690 struct cgw_job *gwj = NULL;
759 int idx = 0; 691 int idx = 0;
760 int s_idx = cb->args[0]; 692 int s_idx = cb->args[0];
761 693
762 rcu_read_lock(); 694 rcu_read_lock();
763 hlist_for_each_entry_rcu(gwj, &net->ca 695 hlist_for_each_entry_rcu(gwj, &net->can.cgw_list, list) {
764 if (idx < s_idx) 696 if (idx < s_idx)
765 goto cont; 697 goto cont;
766 698
767 if (cgw_put_job(skb, gwj, RTM_ 699 if (cgw_put_job(skb, gwj, RTM_NEWROUTE,
768 NETLINK_CB(cb- 700 NETLINK_CB(cb->skb).portid,
769 cb->nlh->nlmsg 701 cb->nlh->nlmsg_seq, NLM_F_MULTI) < 0)
770 break; 702 break;
771 cont: 703 cont:
772 idx++; 704 idx++;
773 } 705 }
774 rcu_read_unlock(); 706 rcu_read_unlock();
775 707
776 cb->args[0] = idx; 708 cb->args[0] = idx;
777 709
778 return skb->len; 710 return skb->len;
779 } 711 }
780 712
781 static const struct nla_policy cgw_policy[CGW_ 713 static const struct nla_policy cgw_policy[CGW_MAX + 1] = {
782 [CGW_MOD_AND] = { .len = sizeof(stru 714 [CGW_MOD_AND] = { .len = sizeof(struct cgw_frame_mod) },
783 [CGW_MOD_OR] = { .len = sizeof(stru 715 [CGW_MOD_OR] = { .len = sizeof(struct cgw_frame_mod) },
784 [CGW_MOD_XOR] = { .len = sizeof(stru 716 [CGW_MOD_XOR] = { .len = sizeof(struct cgw_frame_mod) },
785 [CGW_MOD_SET] = { .len = sizeof(stru 717 [CGW_MOD_SET] = { .len = sizeof(struct cgw_frame_mod) },
786 [CGW_CS_XOR] = { .len = sizeof(stru 718 [CGW_CS_XOR] = { .len = sizeof(struct cgw_csum_xor) },
787 [CGW_CS_CRC8] = { .len = sizeof(stru 719 [CGW_CS_CRC8] = { .len = sizeof(struct cgw_csum_crc8) },
788 [CGW_SRC_IF] = { .type = NLA_U32 }, 720 [CGW_SRC_IF] = { .type = NLA_U32 },
789 [CGW_DST_IF] = { .type = NLA_U32 }, 721 [CGW_DST_IF] = { .type = NLA_U32 },
790 [CGW_FILTER] = { .len = sizeof(stru 722 [CGW_FILTER] = { .len = sizeof(struct can_filter) },
791 [CGW_LIM_HOPS] = { .type = NLA_U8 }, 723 [CGW_LIM_HOPS] = { .type = NLA_U8 },
792 [CGW_MOD_UID] = { .type = NLA_U32 }, 724 [CGW_MOD_UID] = { .type = NLA_U32 },
793 [CGW_FDMOD_AND] = { .len = sizeof(stru 725 [CGW_FDMOD_AND] = { .len = sizeof(struct cgw_fdframe_mod) },
794 [CGW_FDMOD_OR] = { .len = sizeof(stru 726 [CGW_FDMOD_OR] = { .len = sizeof(struct cgw_fdframe_mod) },
795 [CGW_FDMOD_XOR] = { .len = sizeof(stru 727 [CGW_FDMOD_XOR] = { .len = sizeof(struct cgw_fdframe_mod) },
796 [CGW_FDMOD_SET] = { .len = sizeof(stru 728 [CGW_FDMOD_SET] = { .len = sizeof(struct cgw_fdframe_mod) },
797 }; 729 };
798 730
799 /* check for common and gwtype specific attrib 731 /* check for common and gwtype specific attributes */
800 static int cgw_parse_attr(struct nlmsghdr *nlh 732 static int cgw_parse_attr(struct nlmsghdr *nlh, struct cf_mod *mod,
801 u8 gwtype, void *gwt 733 u8 gwtype, void *gwtypeattr, u8 *limhops)
802 { 734 {
803 struct nlattr *tb[CGW_MAX + 1]; 735 struct nlattr *tb[CGW_MAX + 1];
804 struct rtcanmsg *r = nlmsg_data(nlh); 736 struct rtcanmsg *r = nlmsg_data(nlh);
805 int modidx = 0; 737 int modidx = 0;
806 int err = 0; 738 int err = 0;
807 739
808 /* initialize modification & checksum 740 /* initialize modification & checksum data space */
809 memset(mod, 0, sizeof(*mod)); 741 memset(mod, 0, sizeof(*mod));
810 742
811 err = nlmsg_parse_deprecated(nlh, size 743 err = nlmsg_parse_deprecated(nlh, sizeof(struct rtcanmsg), tb,
812 CGW_MAX, 744 CGW_MAX, cgw_policy, NULL);
813 if (err < 0) 745 if (err < 0)
814 return err; 746 return err;
815 747
816 if (tb[CGW_LIM_HOPS]) { 748 if (tb[CGW_LIM_HOPS]) {
817 *limhops = nla_get_u8(tb[CGW_L 749 *limhops = nla_get_u8(tb[CGW_LIM_HOPS]);
818 750
819 if (*limhops < 1 || *limhops > 751 if (*limhops < 1 || *limhops > max_hops)
820 return -EINVAL; 752 return -EINVAL;
821 } 753 }
822 754
823 /* check for AND/OR/XOR/SET modificati 755 /* check for AND/OR/XOR/SET modifications */
824 if (r->flags & CGW_FLAGS_CAN_FD) { 756 if (r->flags & CGW_FLAGS_CAN_FD) {
825 struct cgw_fdframe_mod mb; 757 struct cgw_fdframe_mod mb;
826 758
827 if (tb[CGW_FDMOD_AND]) { 759 if (tb[CGW_FDMOD_AND]) {
828 nla_memcpy(&mb, tb[CGW 760 nla_memcpy(&mb, tb[CGW_FDMOD_AND], CGW_FDMODATTR_LEN);
829 761
830 canfdframecpy(&mod->mo 762 canfdframecpy(&mod->modframe.and, &mb.cf);
831 mod->modtype.and = mb. 763 mod->modtype.and = mb.modtype;
832 764
833 if (mb.modtype & CGW_M 765 if (mb.modtype & CGW_MOD_ID)
834 mod->modfunc[m 766 mod->modfunc[modidx++] = mod_and_id;
835 767
836 if (mb.modtype & CGW_M 768 if (mb.modtype & CGW_MOD_LEN)
837 mod->modfunc[m 769 mod->modfunc[modidx++] = mod_and_len;
838 770
839 if (mb.modtype & CGW_M 771 if (mb.modtype & CGW_MOD_FLAGS)
840 mod->modfunc[m 772 mod->modfunc[modidx++] = mod_and_flags;
841 773
842 if (mb.modtype & CGW_M 774 if (mb.modtype & CGW_MOD_DATA)
843 mod->modfunc[m 775 mod->modfunc[modidx++] = mod_and_fddata;
844 } 776 }
845 777
846 if (tb[CGW_FDMOD_OR]) { 778 if (tb[CGW_FDMOD_OR]) {
847 nla_memcpy(&mb, tb[CGW 779 nla_memcpy(&mb, tb[CGW_FDMOD_OR], CGW_FDMODATTR_LEN);
848 780
849 canfdframecpy(&mod->mo 781 canfdframecpy(&mod->modframe.or, &mb.cf);
850 mod->modtype.or = mb.m 782 mod->modtype.or = mb.modtype;
851 783
852 if (mb.modtype & CGW_M 784 if (mb.modtype & CGW_MOD_ID)
853 mod->modfunc[m 785 mod->modfunc[modidx++] = mod_or_id;
854 786
855 if (mb.modtype & CGW_M 787 if (mb.modtype & CGW_MOD_LEN)
856 mod->modfunc[m 788 mod->modfunc[modidx++] = mod_or_len;
857 789
858 if (mb.modtype & CGW_M 790 if (mb.modtype & CGW_MOD_FLAGS)
859 mod->modfunc[m 791 mod->modfunc[modidx++] = mod_or_flags;
860 792
861 if (mb.modtype & CGW_M 793 if (mb.modtype & CGW_MOD_DATA)
862 mod->modfunc[m 794 mod->modfunc[modidx++] = mod_or_fddata;
863 } 795 }
864 796
865 if (tb[CGW_FDMOD_XOR]) { 797 if (tb[CGW_FDMOD_XOR]) {
866 nla_memcpy(&mb, tb[CGW 798 nla_memcpy(&mb, tb[CGW_FDMOD_XOR], CGW_FDMODATTR_LEN);
867 799
868 canfdframecpy(&mod->mo 800 canfdframecpy(&mod->modframe.xor, &mb.cf);
869 mod->modtype.xor = mb. 801 mod->modtype.xor = mb.modtype;
870 802
871 if (mb.modtype & CGW_M 803 if (mb.modtype & CGW_MOD_ID)
872 mod->modfunc[m 804 mod->modfunc[modidx++] = mod_xor_id;
873 805
874 if (mb.modtype & CGW_M 806 if (mb.modtype & CGW_MOD_LEN)
875 mod->modfunc[m 807 mod->modfunc[modidx++] = mod_xor_len;
876 808
877 if (mb.modtype & CGW_M 809 if (mb.modtype & CGW_MOD_FLAGS)
878 mod->modfunc[m 810 mod->modfunc[modidx++] = mod_xor_flags;
879 811
880 if (mb.modtype & CGW_M 812 if (mb.modtype & CGW_MOD_DATA)
881 mod->modfunc[m 813 mod->modfunc[modidx++] = mod_xor_fddata;
882 } 814 }
883 815
884 if (tb[CGW_FDMOD_SET]) { 816 if (tb[CGW_FDMOD_SET]) {
885 nla_memcpy(&mb, tb[CGW 817 nla_memcpy(&mb, tb[CGW_FDMOD_SET], CGW_FDMODATTR_LEN);
886 818
887 canfdframecpy(&mod->mo 819 canfdframecpy(&mod->modframe.set, &mb.cf);
888 mod->modtype.set = mb. 820 mod->modtype.set = mb.modtype;
889 821
890 if (mb.modtype & CGW_M 822 if (mb.modtype & CGW_MOD_ID)
891 mod->modfunc[m 823 mod->modfunc[modidx++] = mod_set_id;
892 824
893 if (mb.modtype & CGW_M 825 if (mb.modtype & CGW_MOD_LEN)
894 mod->modfunc[m 826 mod->modfunc[modidx++] = mod_set_len;
895 827
896 if (mb.modtype & CGW_M 828 if (mb.modtype & CGW_MOD_FLAGS)
897 mod->modfunc[m 829 mod->modfunc[modidx++] = mod_set_flags;
898 830
899 if (mb.modtype & CGW_M 831 if (mb.modtype & CGW_MOD_DATA)
900 mod->modfunc[m 832 mod->modfunc[modidx++] = mod_set_fddata;
901 } 833 }
902 } else { 834 } else {
903 struct cgw_frame_mod mb; 835 struct cgw_frame_mod mb;
904 836
905 if (tb[CGW_MOD_AND]) { 837 if (tb[CGW_MOD_AND]) {
906 nla_memcpy(&mb, tb[CGW 838 nla_memcpy(&mb, tb[CGW_MOD_AND], CGW_MODATTR_LEN);
907 839
908 canframecpy(&mod->modf 840 canframecpy(&mod->modframe.and, &mb.cf);
909 mod->modtype.and = mb. 841 mod->modtype.and = mb.modtype;
910 842
911 if (mb.modtype & CGW_M 843 if (mb.modtype & CGW_MOD_ID)
912 mod->modfunc[m 844 mod->modfunc[modidx++] = mod_and_id;
913 845
914 if (mb.modtype & CGW_M !! 846 if (mb.modtype & CGW_MOD_LEN)
915 mod->modfunc[m !! 847 mod->modfunc[modidx++] = mod_and_len;
916 848
917 if (mb.modtype & CGW_M 849 if (mb.modtype & CGW_MOD_DATA)
918 mod->modfunc[m 850 mod->modfunc[modidx++] = mod_and_data;
919 } 851 }
920 852
921 if (tb[CGW_MOD_OR]) { 853 if (tb[CGW_MOD_OR]) {
922 nla_memcpy(&mb, tb[CGW 854 nla_memcpy(&mb, tb[CGW_MOD_OR], CGW_MODATTR_LEN);
923 855
924 canframecpy(&mod->modf 856 canframecpy(&mod->modframe.or, &mb.cf);
925 mod->modtype.or = mb.m 857 mod->modtype.or = mb.modtype;
926 858
927 if (mb.modtype & CGW_M 859 if (mb.modtype & CGW_MOD_ID)
928 mod->modfunc[m 860 mod->modfunc[modidx++] = mod_or_id;
929 861
930 if (mb.modtype & CGW_M !! 862 if (mb.modtype & CGW_MOD_LEN)
931 mod->modfunc[m !! 863 mod->modfunc[modidx++] = mod_or_len;
932 864
933 if (mb.modtype & CGW_M 865 if (mb.modtype & CGW_MOD_DATA)
934 mod->modfunc[m 866 mod->modfunc[modidx++] = mod_or_data;
935 } 867 }
936 868
937 if (tb[CGW_MOD_XOR]) { 869 if (tb[CGW_MOD_XOR]) {
938 nla_memcpy(&mb, tb[CGW 870 nla_memcpy(&mb, tb[CGW_MOD_XOR], CGW_MODATTR_LEN);
939 871
940 canframecpy(&mod->modf 872 canframecpy(&mod->modframe.xor, &mb.cf);
941 mod->modtype.xor = mb. 873 mod->modtype.xor = mb.modtype;
942 874
943 if (mb.modtype & CGW_M 875 if (mb.modtype & CGW_MOD_ID)
944 mod->modfunc[m 876 mod->modfunc[modidx++] = mod_xor_id;
945 877
946 if (mb.modtype & CGW_M !! 878 if (mb.modtype & CGW_MOD_LEN)
947 mod->modfunc[m !! 879 mod->modfunc[modidx++] = mod_xor_len;
948 880
949 if (mb.modtype & CGW_M 881 if (mb.modtype & CGW_MOD_DATA)
950 mod->modfunc[m 882 mod->modfunc[modidx++] = mod_xor_data;
951 } 883 }
952 884
953 if (tb[CGW_MOD_SET]) { 885 if (tb[CGW_MOD_SET]) {
954 nla_memcpy(&mb, tb[CGW 886 nla_memcpy(&mb, tb[CGW_MOD_SET], CGW_MODATTR_LEN);
955 887
956 canframecpy(&mod->modf 888 canframecpy(&mod->modframe.set, &mb.cf);
957 mod->modtype.set = mb. 889 mod->modtype.set = mb.modtype;
958 890
959 if (mb.modtype & CGW_M 891 if (mb.modtype & CGW_MOD_ID)
960 mod->modfunc[m 892 mod->modfunc[modidx++] = mod_set_id;
961 893
962 if (mb.modtype & CGW_M !! 894 if (mb.modtype & CGW_MOD_LEN)
963 mod->modfunc[m !! 895 mod->modfunc[modidx++] = mod_set_len;
964 896
965 if (mb.modtype & CGW_M 897 if (mb.modtype & CGW_MOD_DATA)
966 mod->modfunc[m 898 mod->modfunc[modidx++] = mod_set_data;
967 } 899 }
968 } 900 }
969 901
970 /* check for checksum operations after 902 /* check for checksum operations after CAN frame modifications */
971 if (modidx) { 903 if (modidx) {
972 if (tb[CGW_CS_CRC8]) { 904 if (tb[CGW_CS_CRC8]) {
973 struct cgw_csum_crc8 * 905 struct cgw_csum_crc8 *c = nla_data(tb[CGW_CS_CRC8]);
974 906
975 err = cgw_chk_csum_par 907 err = cgw_chk_csum_parms(c->from_idx, c->to_idx,
976 908 c->result_idx, r);
977 if (err) 909 if (err)
978 return err; 910 return err;
979 911
980 nla_memcpy(&mod->csum. 912 nla_memcpy(&mod->csum.crc8, tb[CGW_CS_CRC8],
981 CGW_CS_CRC8 913 CGW_CS_CRC8_LEN);
982 914
983 /* select dedicated pr 915 /* select dedicated processing function to reduce
984 * runtime operations 916 * runtime operations in receive hot path.
985 */ 917 */
986 if (c->from_idx < 0 || 918 if (c->from_idx < 0 || c->to_idx < 0 ||
987 c->result_idx < 0) 919 c->result_idx < 0)
988 mod->csumfunc. 920 mod->csumfunc.crc8 = cgw_csum_crc8_rel;
989 else if (c->from_idx < 921 else if (c->from_idx <= c->to_idx)
990 mod->csumfunc. 922 mod->csumfunc.crc8 = cgw_csum_crc8_pos;
991 else 923 else
992 mod->csumfunc. 924 mod->csumfunc.crc8 = cgw_csum_crc8_neg;
993 } 925 }
994 926
995 if (tb[CGW_CS_XOR]) { 927 if (tb[CGW_CS_XOR]) {
996 struct cgw_csum_xor *c 928 struct cgw_csum_xor *c = nla_data(tb[CGW_CS_XOR]);
997 929
998 err = cgw_chk_csum_par 930 err = cgw_chk_csum_parms(c->from_idx, c->to_idx,
999 931 c->result_idx, r);
1000 if (err) 932 if (err)
1001 return err; 933 return err;
1002 934
1003 nla_memcpy(&mod->csum 935 nla_memcpy(&mod->csum.xor, tb[CGW_CS_XOR],
1004 CGW_CS_XOR 936 CGW_CS_XOR_LEN);
1005 937
1006 /* select dedicated p 938 /* select dedicated processing function to reduce
1007 * runtime operations 939 * runtime operations in receive hot path.
1008 */ 940 */
1009 if (c->from_idx < 0 | 941 if (c->from_idx < 0 || c->to_idx < 0 ||
1010 c->result_idx < 0 942 c->result_idx < 0)
1011 mod->csumfunc 943 mod->csumfunc.xor = cgw_csum_xor_rel;
1012 else if (c->from_idx 944 else if (c->from_idx <= c->to_idx)
1013 mod->csumfunc 945 mod->csumfunc.xor = cgw_csum_xor_pos;
1014 else 946 else
1015 mod->csumfunc 947 mod->csumfunc.xor = cgw_csum_xor_neg;
1016 } 948 }
1017 949
1018 if (tb[CGW_MOD_UID]) 950 if (tb[CGW_MOD_UID])
1019 nla_memcpy(&mod->uid, 951 nla_memcpy(&mod->uid, tb[CGW_MOD_UID], sizeof(u32));
1020 } 952 }
1021 953
1022 if (gwtype == CGW_TYPE_CAN_CAN) { 954 if (gwtype == CGW_TYPE_CAN_CAN) {
1023 /* check CGW_TYPE_CAN_CAN spe 955 /* check CGW_TYPE_CAN_CAN specific attributes */
1024 struct can_can_gw *ccgw = (st 956 struct can_can_gw *ccgw = (struct can_can_gw *)gwtypeattr;
1025 957
1026 memset(ccgw, 0, sizeof(*ccgw) 958 memset(ccgw, 0, sizeof(*ccgw));
1027 959
1028 /* check for can_filter in at 960 /* check for can_filter in attributes */
1029 if (tb[CGW_FILTER]) 961 if (tb[CGW_FILTER])
1030 nla_memcpy(&ccgw->fil 962 nla_memcpy(&ccgw->filter, tb[CGW_FILTER],
1031 sizeof(str 963 sizeof(struct can_filter));
1032 964
1033 err = -ENODEV; 965 err = -ENODEV;
1034 966
1035 /* specifying two interfaces 967 /* specifying two interfaces is mandatory */
1036 if (!tb[CGW_SRC_IF] || !tb[CG 968 if (!tb[CGW_SRC_IF] || !tb[CGW_DST_IF])
1037 return err; 969 return err;
1038 970
1039 ccgw->src_idx = nla_get_u32(t 971 ccgw->src_idx = nla_get_u32(tb[CGW_SRC_IF]);
1040 ccgw->dst_idx = nla_get_u32(t 972 ccgw->dst_idx = nla_get_u32(tb[CGW_DST_IF]);
1041 973
1042 /* both indices set to 0 for 974 /* both indices set to 0 for flushing all routing entries */
1043 if (!ccgw->src_idx && !ccgw-> 975 if (!ccgw->src_idx && !ccgw->dst_idx)
1044 return 0; 976 return 0;
1045 977
1046 /* only one index set to 0 is 978 /* only one index set to 0 is an error */
1047 if (!ccgw->src_idx || !ccgw-> 979 if (!ccgw->src_idx || !ccgw->dst_idx)
1048 return err; 980 return err;
1049 } 981 }
1050 982
1051 /* add the checks for other gwtypes h 983 /* add the checks for other gwtypes here */
1052 984
1053 return 0; 985 return 0;
1054 } 986 }
1055 987
1056 static int cgw_create_job(struct sk_buff *skb 988 static int cgw_create_job(struct sk_buff *skb, struct nlmsghdr *nlh,
1057 struct netlink_ext_ 989 struct netlink_ext_ack *extack)
1058 { 990 {
1059 struct net *net = sock_net(skb->sk); 991 struct net *net = sock_net(skb->sk);
1060 struct rtcanmsg *r; 992 struct rtcanmsg *r;
1061 struct cgw_job *gwj; 993 struct cgw_job *gwj;
1062 struct cf_mod mod; 994 struct cf_mod mod;
1063 struct can_can_gw ccgw; 995 struct can_can_gw ccgw;
1064 u8 limhops = 0; 996 u8 limhops = 0;
1065 int err = 0; 997 int err = 0;
1066 998
1067 if (!netlink_capable(skb, CAP_NET_ADM 999 if (!netlink_capable(skb, CAP_NET_ADMIN))
1068 return -EPERM; 1000 return -EPERM;
1069 1001
1070 if (nlmsg_len(nlh) < sizeof(*r)) 1002 if (nlmsg_len(nlh) < sizeof(*r))
1071 return -EINVAL; 1003 return -EINVAL;
1072 1004
1073 r = nlmsg_data(nlh); 1005 r = nlmsg_data(nlh);
1074 if (r->can_family != AF_CAN) 1006 if (r->can_family != AF_CAN)
1075 return -EPFNOSUPPORT; 1007 return -EPFNOSUPPORT;
1076 1008
1077 /* so far we only support CAN -> CAN 1009 /* so far we only support CAN -> CAN routings */
1078 if (r->gwtype != CGW_TYPE_CAN_CAN) 1010 if (r->gwtype != CGW_TYPE_CAN_CAN)
1079 return -EINVAL; 1011 return -EINVAL;
1080 1012
1081 err = cgw_parse_attr(nlh, &mod, CGW_T 1013 err = cgw_parse_attr(nlh, &mod, CGW_TYPE_CAN_CAN, &ccgw, &limhops);
1082 if (err < 0) 1014 if (err < 0)
1083 return err; 1015 return err;
1084 1016
1085 if (mod.uid) { 1017 if (mod.uid) {
1086 ASSERT_RTNL(); 1018 ASSERT_RTNL();
1087 1019
1088 /* check for updating an exis 1020 /* check for updating an existing job with identical uid */
1089 hlist_for_each_entry(gwj, &ne 1021 hlist_for_each_entry(gwj, &net->can.cgw_list, list) {
1090 if (gwj->mod.uid != m 1022 if (gwj->mod.uid != mod.uid)
1091 continue; 1023 continue;
1092 1024
1093 /* interfaces & filte 1025 /* interfaces & filters must be identical */
1094 if (memcmp(&gwj->ccgw 1026 if (memcmp(&gwj->ccgw, &ccgw, sizeof(ccgw)))
1095 return -EINVA 1027 return -EINVAL;
1096 1028
1097 /* update modificatio 1029 /* update modifications with disabled softirq & quit */
1098 local_bh_disable(); 1030 local_bh_disable();
1099 memcpy(&gwj->mod, &mo 1031 memcpy(&gwj->mod, &mod, sizeof(mod));
1100 local_bh_enable(); 1032 local_bh_enable();
1101 return 0; 1033 return 0;
1102 } 1034 }
1103 } 1035 }
1104 1036
1105 /* ifindex == 0 is not allowed for jo 1037 /* ifindex == 0 is not allowed for job creation */
1106 if (!ccgw.src_idx || !ccgw.dst_idx) 1038 if (!ccgw.src_idx || !ccgw.dst_idx)
1107 return -ENODEV; 1039 return -ENODEV;
1108 1040
1109 gwj = kmem_cache_alloc(cgw_cache, GFP 1041 gwj = kmem_cache_alloc(cgw_cache, GFP_KERNEL);
1110 if (!gwj) 1042 if (!gwj)
1111 return -ENOMEM; 1043 return -ENOMEM;
1112 1044
1113 gwj->handled_frames = 0; 1045 gwj->handled_frames = 0;
1114 gwj->dropped_frames = 0; 1046 gwj->dropped_frames = 0;
1115 gwj->deleted_frames = 0; 1047 gwj->deleted_frames = 0;
1116 gwj->flags = r->flags; 1048 gwj->flags = r->flags;
1117 gwj->gwtype = r->gwtype; 1049 gwj->gwtype = r->gwtype;
1118 gwj->limit_hops = limhops; 1050 gwj->limit_hops = limhops;
1119 1051
1120 /* insert already parsed information 1052 /* insert already parsed information */
1121 memcpy(&gwj->mod, &mod, sizeof(mod)); 1053 memcpy(&gwj->mod, &mod, sizeof(mod));
1122 memcpy(&gwj->ccgw, &ccgw, sizeof(ccgw 1054 memcpy(&gwj->ccgw, &ccgw, sizeof(ccgw));
1123 1055
1124 err = -ENODEV; 1056 err = -ENODEV;
1125 1057
1126 gwj->src.dev = __dev_get_by_index(net 1058 gwj->src.dev = __dev_get_by_index(net, gwj->ccgw.src_idx);
1127 1059
1128 if (!gwj->src.dev) 1060 if (!gwj->src.dev)
1129 goto out; 1061 goto out;
1130 1062
1131 if (gwj->src.dev->type != ARPHRD_CAN) 1063 if (gwj->src.dev->type != ARPHRD_CAN)
1132 goto out; 1064 goto out;
1133 1065
1134 gwj->dst.dev = __dev_get_by_index(net 1066 gwj->dst.dev = __dev_get_by_index(net, gwj->ccgw.dst_idx);
1135 1067
1136 if (!gwj->dst.dev) 1068 if (!gwj->dst.dev)
1137 goto out; 1069 goto out;
1138 1070
1139 if (gwj->dst.dev->type != ARPHRD_CAN) 1071 if (gwj->dst.dev->type != ARPHRD_CAN)
1140 goto out; 1072 goto out;
1141 1073
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(); 1074 ASSERT_RTNL();
1150 1075
1151 err = cgw_register_filter(net, gwj); 1076 err = cgw_register_filter(net, gwj);
1152 if (!err) 1077 if (!err)
1153 hlist_add_head_rcu(&gwj->list 1078 hlist_add_head_rcu(&gwj->list, &net->can.cgw_list);
1154 out: 1079 out:
1155 if (err) 1080 if (err)
1156 kmem_cache_free(cgw_cache, gw 1081 kmem_cache_free(cgw_cache, gwj);
1157 1082
1158 return err; 1083 return err;
1159 } 1084 }
1160 1085
1161 static void cgw_remove_all_jobs(struct net *n 1086 static void cgw_remove_all_jobs(struct net *net)
1162 { 1087 {
1163 struct cgw_job *gwj = NULL; 1088 struct cgw_job *gwj = NULL;
1164 struct hlist_node *nx; 1089 struct hlist_node *nx;
1165 1090
1166 ASSERT_RTNL(); 1091 ASSERT_RTNL();
1167 1092
1168 hlist_for_each_entry_safe(gwj, nx, &n 1093 hlist_for_each_entry_safe(gwj, nx, &net->can.cgw_list, list) {
1169 hlist_del(&gwj->list); 1094 hlist_del(&gwj->list);
1170 cgw_unregister_filter(net, gw 1095 cgw_unregister_filter(net, gwj);
1171 call_rcu(&gwj->rcu, cgw_job_f !! 1096 kmem_cache_free(cgw_cache, gwj);
1172 } 1097 }
1173 } 1098 }
1174 1099
1175 static int cgw_remove_job(struct sk_buff *skb 1100 static int cgw_remove_job(struct sk_buff *skb, struct nlmsghdr *nlh,
1176 struct netlink_ext_ 1101 struct netlink_ext_ack *extack)
1177 { 1102 {
1178 struct net *net = sock_net(skb->sk); 1103 struct net *net = sock_net(skb->sk);
1179 struct cgw_job *gwj = NULL; 1104 struct cgw_job *gwj = NULL;
1180 struct hlist_node *nx; 1105 struct hlist_node *nx;
1181 struct rtcanmsg *r; 1106 struct rtcanmsg *r;
1182 struct cf_mod mod; 1107 struct cf_mod mod;
1183 struct can_can_gw ccgw; 1108 struct can_can_gw ccgw;
1184 u8 limhops = 0; 1109 u8 limhops = 0;
1185 int err = 0; 1110 int err = 0;
1186 1111
1187 if (!netlink_capable(skb, CAP_NET_ADM 1112 if (!netlink_capable(skb, CAP_NET_ADMIN))
1188 return -EPERM; 1113 return -EPERM;
1189 1114
1190 if (nlmsg_len(nlh) < sizeof(*r)) 1115 if (nlmsg_len(nlh) < sizeof(*r))
1191 return -EINVAL; 1116 return -EINVAL;
1192 1117
1193 r = nlmsg_data(nlh); 1118 r = nlmsg_data(nlh);
1194 if (r->can_family != AF_CAN) 1119 if (r->can_family != AF_CAN)
1195 return -EPFNOSUPPORT; 1120 return -EPFNOSUPPORT;
1196 1121
1197 /* so far we only support CAN -> CAN 1122 /* so far we only support CAN -> CAN routings */
1198 if (r->gwtype != CGW_TYPE_CAN_CAN) 1123 if (r->gwtype != CGW_TYPE_CAN_CAN)
1199 return -EINVAL; 1124 return -EINVAL;
1200 1125
1201 err = cgw_parse_attr(nlh, &mod, CGW_T 1126 err = cgw_parse_attr(nlh, &mod, CGW_TYPE_CAN_CAN, &ccgw, &limhops);
1202 if (err < 0) 1127 if (err < 0)
1203 return err; 1128 return err;
1204 1129
1205 /* two interface indices both set to 1130 /* two interface indices both set to 0 => remove all entries */
1206 if (!ccgw.src_idx && !ccgw.dst_idx) { 1131 if (!ccgw.src_idx && !ccgw.dst_idx) {
1207 cgw_remove_all_jobs(net); 1132 cgw_remove_all_jobs(net);
1208 return 0; 1133 return 0;
1209 } 1134 }
1210 1135
1211 err = -EINVAL; 1136 err = -EINVAL;
1212 1137
1213 ASSERT_RTNL(); 1138 ASSERT_RTNL();
1214 1139
1215 /* remove only the first matching ent 1140 /* remove only the first matching entry */
1216 hlist_for_each_entry_safe(gwj, nx, &n 1141 hlist_for_each_entry_safe(gwj, nx, &net->can.cgw_list, list) {
1217 if (gwj->flags != r->flags) 1142 if (gwj->flags != r->flags)
1218 continue; 1143 continue;
1219 1144
1220 if (gwj->limit_hops != limhop 1145 if (gwj->limit_hops != limhops)
1221 continue; 1146 continue;
1222 1147
1223 /* we have a match when uid i 1148 /* we have a match when uid is enabled and identical */
1224 if (gwj->mod.uid || mod.uid) 1149 if (gwj->mod.uid || mod.uid) {
1225 if (gwj->mod.uid != m 1150 if (gwj->mod.uid != mod.uid)
1226 continue; 1151 continue;
1227 } else { 1152 } else {
1228 /* no uid => check fo 1153 /* no uid => check for identical modifications */
1229 if (memcmp(&gwj->mod, 1154 if (memcmp(&gwj->mod, &mod, sizeof(mod)))
1230 continue; 1155 continue;
1231 } 1156 }
1232 1157
1233 /* if (r->gwtype == CGW_TYPE_ 1158 /* if (r->gwtype == CGW_TYPE_CAN_CAN) - is made sure here */
1234 if (memcmp(&gwj->ccgw, &ccgw, 1159 if (memcmp(&gwj->ccgw, &ccgw, sizeof(ccgw)))
1235 continue; 1160 continue;
1236 1161
1237 hlist_del(&gwj->list); 1162 hlist_del(&gwj->list);
1238 cgw_unregister_filter(net, gw 1163 cgw_unregister_filter(net, gwj);
1239 call_rcu(&gwj->rcu, cgw_job_f !! 1164 kmem_cache_free(cgw_cache, gwj);
1240 err = 0; 1165 err = 0;
1241 break; 1166 break;
1242 } 1167 }
1243 1168
1244 return err; 1169 return err;
1245 } 1170 }
1246 1171
1247 static int __net_init cangw_pernet_init(struc 1172 static int __net_init cangw_pernet_init(struct net *net)
1248 { 1173 {
1249 INIT_HLIST_HEAD(&net->can.cgw_list); 1174 INIT_HLIST_HEAD(&net->can.cgw_list);
1250 return 0; 1175 return 0;
1251 } 1176 }
1252 1177
1253 static void __net_exit cangw_pernet_exit_batc !! 1178 static void __net_exit cangw_pernet_exit(struct net *net)
1254 { 1179 {
1255 struct net *net; <<
1256 <<
1257 rtnl_lock(); 1180 rtnl_lock();
1258 list_for_each_entry(net, net_list, ex !! 1181 cgw_remove_all_jobs(net);
1259 cgw_remove_all_jobs(net); <<
1260 rtnl_unlock(); 1182 rtnl_unlock();
1261 } 1183 }
1262 1184
1263 static struct pernet_operations cangw_pernet_ 1185 static struct pernet_operations cangw_pernet_ops = {
1264 .init = cangw_pernet_init, 1186 .init = cangw_pernet_init,
1265 .exit_batch = cangw_pernet_exit_batch !! 1187 .exit = cangw_pernet_exit,
1266 }; 1188 };
1267 1189
1268 static __init int cgw_module_init(void) 1190 static __init int cgw_module_init(void)
1269 { 1191 {
1270 int ret; 1192 int ret;
1271 1193
1272 /* sanitize given module parameter */ 1194 /* sanitize given module parameter */
1273 max_hops = clamp_t(unsigned int, max_ 1195 max_hops = clamp_t(unsigned int, max_hops, CGW_MIN_HOPS, CGW_MAX_HOPS);
1274 1196
1275 pr_info("can: netlink gateway - max_h !! 1197 pr_info("can: netlink gateway (rev " CAN_GW_VERSION ") max_hops=%d\n",
>> 1198 max_hops);
1276 1199
1277 ret = register_pernet_subsys(&cangw_p 1200 ret = register_pernet_subsys(&cangw_pernet_ops);
1278 if (ret) 1201 if (ret)
1279 return ret; 1202 return ret;
1280 1203
1281 ret = -ENOMEM; 1204 ret = -ENOMEM;
1282 cgw_cache = kmem_cache_create("can_gw 1205 cgw_cache = kmem_cache_create("can_gw", sizeof(struct cgw_job),
1283 0, 0, N 1206 0, 0, NULL);
1284 if (!cgw_cache) 1207 if (!cgw_cache)
1285 goto out_cache_create; 1208 goto out_cache_create;
1286 1209
1287 /* set notifier */ 1210 /* set notifier */
1288 notifier.notifier_call = cgw_notifier 1211 notifier.notifier_call = cgw_notifier;
1289 ret = register_netdevice_notifier(&no 1212 ret = register_netdevice_notifier(¬ifier);
1290 if (ret) 1213 if (ret)
1291 goto out_register_notifier; 1214 goto out_register_notifier;
1292 1215
1293 ret = rtnl_register_module(THIS_MODUL 1216 ret = rtnl_register_module(THIS_MODULE, PF_CAN, RTM_GETROUTE,
1294 NULL, cgw_ 1217 NULL, cgw_dump_jobs, 0);
1295 if (ret) 1218 if (ret)
1296 goto out_rtnl_register1; 1219 goto out_rtnl_register1;
1297 1220
1298 ret = rtnl_register_module(THIS_MODUL 1221 ret = rtnl_register_module(THIS_MODULE, PF_CAN, RTM_NEWROUTE,
1299 cgw_create 1222 cgw_create_job, NULL, 0);
1300 if (ret) 1223 if (ret)
1301 goto out_rtnl_register2; 1224 goto out_rtnl_register2;
1302 ret = rtnl_register_module(THIS_MODUL 1225 ret = rtnl_register_module(THIS_MODULE, PF_CAN, RTM_DELROUTE,
1303 cgw_remove 1226 cgw_remove_job, NULL, 0);
1304 if (ret) 1227 if (ret)
1305 goto out_rtnl_register3; 1228 goto out_rtnl_register3;
1306 1229
1307 return 0; 1230 return 0;
1308 1231
1309 out_rtnl_register3: 1232 out_rtnl_register3:
1310 rtnl_unregister(PF_CAN, RTM_NEWROUTE) 1233 rtnl_unregister(PF_CAN, RTM_NEWROUTE);
1311 out_rtnl_register2: 1234 out_rtnl_register2:
1312 rtnl_unregister(PF_CAN, RTM_GETROUTE) 1235 rtnl_unregister(PF_CAN, RTM_GETROUTE);
1313 out_rtnl_register1: 1236 out_rtnl_register1:
1314 unregister_netdevice_notifier(¬ifi 1237 unregister_netdevice_notifier(¬ifier);
1315 out_register_notifier: 1238 out_register_notifier:
1316 kmem_cache_destroy(cgw_cache); 1239 kmem_cache_destroy(cgw_cache);
1317 out_cache_create: 1240 out_cache_create:
1318 unregister_pernet_subsys(&cangw_perne 1241 unregister_pernet_subsys(&cangw_pernet_ops);
1319 1242
1320 return ret; 1243 return ret;
1321 } 1244 }
1322 1245
1323 static __exit void cgw_module_exit(void) 1246 static __exit void cgw_module_exit(void)
1324 { 1247 {
1325 rtnl_unregister_all(PF_CAN); 1248 rtnl_unregister_all(PF_CAN);
1326 1249
1327 unregister_netdevice_notifier(¬ifi 1250 unregister_netdevice_notifier(¬ifier);
1328 1251
1329 unregister_pernet_subsys(&cangw_perne 1252 unregister_pernet_subsys(&cangw_pernet_ops);
1330 rcu_barrier(); /* Wait for completion 1253 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1331 1254
1332 kmem_cache_destroy(cgw_cache); 1255 kmem_cache_destroy(cgw_cache);
1333 } 1256 }
1334 1257
1335 module_init(cgw_module_init); 1258 module_init(cgw_module_init);
1336 module_exit(cgw_module_exit); 1259 module_exit(cgw_module_exit);
1337 1260
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