Re: [PATCH net-next] inet: remove races in inet{6}_getname()

Hi Eric,

I love your patch! Yet something to improve:

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

url:    https://github.com/0day-ci/linux/commits/Eric-Dumazet/inet-remove-races-in-inet-6-_getname/20211027-013901
base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git 6b3671746a8a3aa05316b829e1357060f35009c1
config: csky-defconfig (attached as .config)
compiler: csky-linux-gcc (GCC) 11.2.0
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/337791bc53db80fb5982e0f66be795a2d37c3d8d
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Eric-Dumazet/inet-remove-races-in-inet-6-_getname/20211027-013901
        git checkout 337791bc53db80fb5982e0f66be795a2d37c3d8d
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=csky 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <redacted>

All errors (new ones prefixed by >>):

   net/ipv6/af_inet6.c: In function 'inet6_getname':

quoted

net/ipv6/af_inet6.c:536:17: error: implicit declaration of function 'BPF_CGROUP_RUN_SA_PROG'; did you mean 'BPF_CGROUP_RUN_SA_PROG_LOCK'? [-Werror=implicit-function-declaration]

     536 |                 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin,
         |                 ^~~~~~~~~~~~~~~~~~~~~~
         |                 BPF_CGROUP_RUN_SA_PROG_LOCK

quoted

net/ipv6/af_inet6.c:537:40: error: 'CGROUP_INET6_GETPEERNAME' undeclared (first use in this function); did you mean 'BPF_CGROUP_INET6_GETPEERNAME'?

     537 |                                        CGROUP_INET6_GETPEERNAME);
         |                                        ^~~~~~~~~~~~~~~~~~~~~~~~
         |                                        BPF_CGROUP_INET6_GETPEERNAME
   net/ipv6/af_inet6.c:537:40: note: each undeclared identifier is reported only once for each function it appears in

quoted

net/ipv6/af_inet6.c:545:40: error: 'CGROUP_INET6_GETSOCKNAME' undeclared (first use in this function); did you mean 'BPF_CGROUP_INET6_GETSOCKNAME'?

     545 |                                        CGROUP_INET6_GETSOCKNAME);
         |                                        ^~~~~~~~~~~~~~~~~~~~~~~~
         |                                        BPF_CGROUP_INET6_GETSOCKNAME
   cc1: some warnings being treated as errors


vim +536 net/ipv6/af_inet6.c

   509	
   510	/*
   511	 *	This does both peername and sockname.
   512	 */
   513	int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
   514			  int peer)
   515	{
   516		struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
   517		struct sock *sk = sock->sk;
   518		struct inet_sock *inet = inet_sk(sk);
   519		struct ipv6_pinfo *np = inet6_sk(sk);
   520	
   521		sin->sin6_family = AF_INET6;
   522		sin->sin6_flowinfo = 0;
   523		sin->sin6_scope_id = 0;
   524		lock_sock(sk);
   525		if (peer) {
   526			if (!inet->inet_dport ||
   527			    (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
   528			    peer == 1)) {
   529				release_sock(sk);
   530				return -ENOTCONN;
   531			}
   532			sin->sin6_port = inet->inet_dport;
   533			sin->sin6_addr = sk->sk_v6_daddr;
   534			if (np->sndflow)
   535				sin->sin6_flowinfo = np->flow_label;
 > 536			BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin,
 > 537					       CGROUP_INET6_GETPEERNAME);
   538		} else {
   539			if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
   540				sin->sin6_addr = np->saddr;
   541			else
   542				sin->sin6_addr = sk->sk_v6_rcv_saddr;
   543			sin->sin6_port = inet->inet_sport;
   544			BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin,
 > 545					       CGROUP_INET6_GETSOCKNAME);
   546		}
   547		sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
   548							 sk->sk_bound_dev_if);
   549		release_sock(sk);
   550		return sizeof(*sin);
   551	}
   552	EXPORT_SYMBOL(inet6_getname);
   553	

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0-DAY CI Kernel Test Service, Intel Corporation
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