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Date: Sat, 4 Sep 2021 10:18:48 +0800
From: kernel test robot <lkp@...el.com>
To: Toms Atteka <cpp.code.lv@...il.com>, netdev@...r.kernel.org
Cc: llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
Toms Atteka <cpp.code.lv@...il.com>
Subject: Re: [PATCH net-next v3] net: openvswitch: IPv6: Add IPv6 extension
header support
Hi Toms,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on net-next/master]
url: https://github.com/0day-ci/linux/commits/Toms-Atteka/net-openvswitch-IPv6-Add-IPv6-extension-header-support/20210904-045602
base: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git 29ce8f9701072fc221d9c38ad952de1a9578f95c
config: i386-randconfig-a012-20210904 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 1104e3258b5064e7110cc297e2cec60ac9acfc0a)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://github.com/0day-ci/linux/commit/dbd8852a931c7418829a31dcd51d8b2245f27f79
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Toms-Atteka/net-openvswitch-IPv6-Add-IPv6-extension-header-support/20210904-045602
git checkout dbd8852a931c7418829a31dcd51d8b2245f27f79
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=i386
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>
All warnings (new ones prefixed by >>):
>> net/openvswitch/flow.c:268:6: warning: no previous prototype for function 'get_ipv6_ext_hdrs' [-Wmissing-prototypes]
void get_ipv6_ext_hdrs(struct sk_buff *skb, struct ipv6hdr *nh, u16 *ext_hdrs)
^
net/openvswitch/flow.c:268:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void get_ipv6_ext_hdrs(struct sk_buff *skb, struct ipv6hdr *nh, u16 *ext_hdrs)
^
static
1 warning generated.
vim +/get_ipv6_ext_hdrs +268 net/openvswitch/flow.c
241
242 /**
243 * Parses packet and sets IPv6 extension header flags.
244 *
245 * skb buffer where extension header data starts in packet
246 * nh ipv6 header
247 * ext_hdrs flags are stored here
248 *
249 * OFPIEH12_UNREP is set if more than one of a given IPv6 extension header
250 * is unexpectedly encountered. (Two destination options headers may be
251 * expected and would not cause this bit to be set.)
252 *
253 * OFPIEH12_UNSEQ is set if IPv6 extension headers were not in the order
254 * preferred (but not required) by RFC 2460:
255 *
256 * When more than one extension header is used in the same packet, it is
257 * recommended that those headers appear in the following order:
258 * IPv6 header
259 * Hop-by-Hop Options header
260 * Destination Options header
261 * Routing header
262 * Fragment header
263 * Authentication header
264 * Encapsulating Security Payload header
265 * Destination Options header
266 * upper-layer header
267 */
> 268 void get_ipv6_ext_hdrs(struct sk_buff *skb, struct ipv6hdr *nh, u16 *ext_hdrs)
269 {
270 u8 next_type = nh->nexthdr;
271 unsigned int start = skb_network_offset(skb) + sizeof(struct ipv6hdr);
272 int dest_options_header_count = 0;
273
274 *ext_hdrs = 0;
275
276 while (ipv6_ext_hdr(next_type)) {
277 struct ipv6_opt_hdr _hdr, *hp;
278
279 switch (next_type) {
280 case IPPROTO_NONE:
281 *ext_hdrs |= OFPIEH12_NONEXT;
282 /* stop parsing */
283 return;
284
285 case IPPROTO_ESP:
286 if (*ext_hdrs & OFPIEH12_ESP)
287 *ext_hdrs |= OFPIEH12_UNREP;
288 if ((*ext_hdrs & ~(OFPIEH12_HOP | OFPIEH12_DEST |
289 OFPIEH12_ROUTER | IPPROTO_FRAGMENT |
290 OFPIEH12_AUTH | OFPIEH12_UNREP)) ||
291 dest_options_header_count >= 2) {
292 *ext_hdrs |= OFPIEH12_UNSEQ;
293 }
294 *ext_hdrs |= OFPIEH12_ESP;
295 break;
296
297 case IPPROTO_AH:
298 if (*ext_hdrs & OFPIEH12_AUTH)
299 *ext_hdrs |= OFPIEH12_UNREP;
300 if ((*ext_hdrs &
301 ~(OFPIEH12_HOP | OFPIEH12_DEST | OFPIEH12_ROUTER |
302 IPPROTO_FRAGMENT | OFPIEH12_UNREP)) ||
303 dest_options_header_count >= 2) {
304 *ext_hdrs |= OFPIEH12_UNSEQ;
305 }
306 *ext_hdrs |= OFPIEH12_AUTH;
307 break;
308
309 case IPPROTO_DSTOPTS:
310 if (dest_options_header_count == 0) {
311 if (*ext_hdrs &
312 ~(OFPIEH12_HOP | OFPIEH12_UNREP))
313 *ext_hdrs |= OFPIEH12_UNSEQ;
314 *ext_hdrs |= OFPIEH12_DEST;
315 } else if (dest_options_header_count == 1) {
316 if (*ext_hdrs &
317 ~(OFPIEH12_HOP | OFPIEH12_DEST |
318 OFPIEH12_ROUTER | OFPIEH12_FRAG |
319 OFPIEH12_AUTH | OFPIEH12_ESP |
320 OFPIEH12_UNREP)) {
321 *ext_hdrs |= OFPIEH12_UNSEQ;
322 }
323 } else {
324 *ext_hdrs |= OFPIEH12_UNREP;
325 }
326 dest_options_header_count++;
327 break;
328
329 case IPPROTO_FRAGMENT:
330 if (*ext_hdrs & OFPIEH12_FRAG)
331 *ext_hdrs |= OFPIEH12_UNREP;
332 if ((*ext_hdrs & ~(OFPIEH12_HOP |
333 OFPIEH12_DEST |
334 OFPIEH12_ROUTER |
335 OFPIEH12_UNREP)) ||
336 dest_options_header_count >= 2) {
337 *ext_hdrs |= OFPIEH12_UNSEQ;
338 }
339 *ext_hdrs |= OFPIEH12_FRAG;
340 break;
341
342 case IPPROTO_ROUTING:
343 if (*ext_hdrs & OFPIEH12_ROUTER)
344 *ext_hdrs |= OFPIEH12_UNREP;
345 if ((*ext_hdrs & ~(OFPIEH12_HOP |
346 OFPIEH12_DEST |
347 OFPIEH12_UNREP)) ||
348 dest_options_header_count >= 2) {
349 *ext_hdrs |= OFPIEH12_UNSEQ;
350 }
351 *ext_hdrs |= OFPIEH12_ROUTER;
352 break;
353
354 case IPPROTO_HOPOPTS:
355 if (*ext_hdrs & OFPIEH12_HOP)
356 *ext_hdrs |= OFPIEH12_UNREP;
357 /* OFPIEH12_HOP is set to 1 if a hop-by-hop IPv6
358 * extension header is present as the first
359 * extension header in the packet.
360 */
361 if (*ext_hdrs == 0)
362 *ext_hdrs |= OFPIEH12_HOP;
363 else
364 *ext_hdrs |= OFPIEH12_UNSEQ;
365 break;
366
367 default:
368 return;
369 }
370
371 hp = skb_header_pointer(skb, start, sizeof(_hdr), &_hdr);
372 if (!hp)
373 break;
374 next_type = hp->nexthdr;
375 start += ipv6_optlen(hp);
376 };
377 }
378
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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