Subject: Re: [PATCH net-next v2 04/12] flow_dissector: UDP encap infrastructure

From: kernel test robot <[email-masked]>
Date: Sat, 17 Aug 2024 22:01:04 +0800

Hi Tom,

kernel test robot noticed the following build errors:

[auto build test ERROR on net-next/main]

url:    https://github.com/intel-lab-lkp/linux/commits/Tom-Herbert/flow_dissector-Parse-ETH_P_TEB-and-move-out-of-GRE/20240816-102659
base:   net-next/main
patch link:    https://lore.kernel.org/r/20240815214527.2100137-5-tom%40herbertland.com
patch subject: [PATCH net-next v2 04/12] flow_dissector: UDP encap infrastructure
config: loongarch-randconfig-002-20240817 (https://download.01.org/0day-ci/archive/20240817/[email-masked]/config)
compiler: loongarch64-linux-gcc (GCC) 14.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240817/[email-masked]/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <[email-masked]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email-masked]/

All errors (new ones prefixed by >>):

   loongarch64-linux-ld: net/core/flow_dissector.o: in function `__skb_flow_dissect_udp':
>> net/core/flow_dissector.c:844:(.text+0x13e8): undefined reference to `__udp4_lib_lookup'

vim +844 net/core/flow_dissector.c

   809	
   810	static enum flow_dissect_ret
   811	__skb_flow_dissect_udp(const struct sk_buff *skb, const struct net *net,
   812			       struct flow_dissector *flow_dissector,
   813			       void *target_container, const void *data,
   814			       int *p_nhoff, int hlen, __be16 *p_proto,
   815			       u8 *p_ip_proto, int base_nhoff, unsigned int flags)
   816	{
   817		enum flow_dissect_ret ret;
   818		const struct udphdr *udph;
   819		struct udphdr _udph;
   820		struct sock *sk;
   821		__u8 encap_type;
   822		int nhoff;
   823	
   824		if (!(flags & FLOW_DISSECTOR_F_PARSE_UDP_ENCAPS))
   825			return FLOW_DISSECT_RET_OUT_GOOD;
   826	
   827		switch (*p_proto) {
   828		case htons(ETH_P_IP): {
   829			const struct iphdr *iph;
   830			struct iphdr _iph;
   831	
   832			iph = __skb_header_pointer(skb, base_nhoff, sizeof(_iph), data,
   833						   hlen, &_iph);
   834			if (!iph)
   835				return FLOW_DISSECT_RET_OUT_BAD;
   836	
   837			udph = __skb_header_pointer(skb, *p_nhoff, sizeof(_udph), data,
   838						    hlen, &_udph);
   839			if (!udph)
   840				return FLOW_DISSECT_RET_OUT_BAD;
   841	
   842			rcu_read_lock();
   843			/* Look up the UDPv4 socket and get the encap_type */
 > 844			sk = __udp4_lib_lookup(net, iph->saddr, udph->source,
   845					       iph->daddr, udph->dest,
   846					       inet_iif(skb), inet_sdif(skb),
   847					       net->ipv4.udp_table, NULL);
   848			if (!sk || !udp_sk(sk)->encap_type) {
   849				rcu_read_unlock();
   850				return FLOW_DISSECT_RET_OUT_GOOD;
   851			}
   852	
   853			encap_type = udp_sk(sk)->encap_type;
   854			rcu_read_unlock();
   855	
   856			break;
   857		}
   858	#if IS_ENABLED(CONFIG_IPV6)
   859		case htons(ETH_P_IPV6): {
   860			const struct ipv6hdr *iph;
   861			struct ipv6hdr _iph;
   862	
   863			if (!likely(ipv6_bpf_stub))
   864				return FLOW_DISSECT_RET_OUT_GOOD;
   865	
   866			iph = __skb_header_pointer(skb, base_nhoff, sizeof(_iph), data,
   867						   hlen, &_iph);
   868			if (!iph)
   869				return FLOW_DISSECT_RET_OUT_BAD;
   870	
   871			udph = __skb_header_pointer(skb, *p_nhoff, sizeof(_udph), data,
   872						    hlen, &_udph);
   873			if (!udph)
   874				return FLOW_DISSECT_RET_OUT_BAD;
   875	
   876			rcu_read_lock();
   877			/* Look up the UDPv6 socket and get the encap_type */
   878			sk = ipv6_bpf_stub->udp6_lib_lookup(net,
   879					&iph->saddr, udph->source,
   880					&iph->daddr, udph->dest,
   881					inet_iif(skb), inet_sdif(skb),
   882					net->ipv4.udp_table, NULL);
   883	
   884			if (!sk || !udp_sk(sk)->encap_type) {
   885				rcu_read_unlock();
   886				return FLOW_DISSECT_RET_OUT_GOOD;
   887			}
   888	
   889			encap_type = udp_sk(sk)->encap_type;
   890			rcu_read_unlock();
   891	
   892			break;
   893		}
   894	#endif /* CONFIG_IPV6 */
   895		default:
   896			return FLOW_DISSECT_RET_OUT_GOOD;
   897		}
   898	
   899		nhoff = *p_nhoff + sizeof(struct udphdr);
   900		ret = FLOW_DISSECT_RET_OUT_GOOD;
   901	
   902		switch (encap_type) {
   903		default:
   904			break;
   905		}
   906	
   907		switch (ret) {
   908		case FLOW_DISSECT_RET_PROTO_AGAIN:
   909			*p_ip_proto = 0;
   910			fallthrough;
   911		case FLOW_DISSECT_RET_IPPROTO_AGAIN:
   912			*p_nhoff = nhoff;
   913			break;
   914		default:
   915			break;
   916		}
   917	
   918		return ret;
   919	}
   920	

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