Re: [PATCH ipsec-next,v2] xfrm: support sending NAT keepalives in ESP in UDP states

[kernel test robot <lkp@intel.com>]

Hi Eyal,

kernel test robot noticed the following build errors:

[auto build test ERROR on netfilter-nf/main]
[also build test ERROR on linus/master v6.7-rc5 next-20231214]
[cannot apply to horms-ipvs/master]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Eyal-Birger/xfrm-support-sending-NAT-keepalives-in-ESP-in-UDP-states/20231211-020238
base:   git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf.git main
patch link:    https://lore.kernel.org/r/20231210180116.1737411-1-eyal.birger%40gmail.com
patch subject: [PATCH ipsec-next,v2] xfrm: support sending NAT keepalives in ESP in UDP states
config: x86_64-rhel-8.3-ltp (https://download.01.org/0day-ci/archive/20231215/202312150227.iYQMDIJT-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231215/202312150227.iYQMDIJT-lkp@intel.com/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 <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202312150227.iYQMDIJT-lkp@intel.com/

All errors (new ones prefixed by >>):

   net/xfrm/xfrm_nat_keepalive.c: In function 'nat_keepalive_send_ipv6':
>> net/xfrm/xfrm_nat_keepalive.c:78:21: error: implicit declaration of function 'csum_ipv6_magic'; did you mean 'csum_tcpudp_magic'? [-Werror=implicit-function-declaration]
      78 |         uh->check = csum_ipv6_magic(&ka->saddr.in6, &ka->daddr.in6,
         |                     ^~~~~~~~~~~~~~~
         |                     csum_tcpudp_magic
   cc1: some warnings being treated as errors


vim +78 net/xfrm/xfrm_nat_keepalive.c

    64	
    65	#if IS_ENABLED(CONFIG_IPV6)
    66	static int nat_keepalive_send_ipv6(struct sk_buff *skb,
    67					   struct nat_keepalive *ka,
    68					   struct udphdr *uh)
    69	{
    70		struct net *net = ka->net;
    71		struct dst_entry *dst;
    72		struct flowi6 fl6;
    73		struct sock *sk;
    74		__wsum csum;
    75		int err;
    76	
    77		csum = skb_checksum(skb, 0, skb->len, 0);
  > 78		uh->check = csum_ipv6_magic(&ka->saddr.in6, &ka->daddr.in6,
    79					    skb->len, IPPROTO_UDP, csum);
    80		if (uh->check == 0)
    81			uh->check = CSUM_MANGLED_0;
    82	
    83		memset(&fl6, 0, sizeof(fl6));
    84		fl6.flowi6_mark = skb->mark;
    85		fl6.saddr = ka->saddr.in6;
    86		fl6.daddr = ka->daddr.in6;
    87		fl6.flowi6_proto = IPPROTO_UDP;
    88		fl6.fl6_sport = ka->encap_sport;
    89		fl6.fl6_dport = ka->encap_dport;
    90	
    91		sk = *this_cpu_ptr(&nat_keepalive_sk_ipv6);
    92		sock_net_set(sk, net);
    93		dst = ipv6_stub->ipv6_dst_lookup_flow(net, sk, &fl6, NULL);
    94		if (IS_ERR(dst))
    95			return PTR_ERR(dst);
    96	
    97		skb_dst_set(skb, dst);
    98		err = ipv6_stub->ip6_xmit(sk, skb, &fl6, skb->mark, NULL, 0, 0);
    99		sock_net_set(sk, &init_net);
   100		return err;
   101	}
   102	#endif
   103	

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