netdev - Re: commit b9ef5513c99b breaks ping to ipv6 linklocal addresses on debian buster

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Message-ID: <153de016-8274-5d62-83fe-ce7d8218f906@i-love.sakura.ne.jp>
Date:   Tue, 7 Jan 2020 06:03:44 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
To:     David Ahern <dsahern@...il.com>
Cc:     Casey Schaufler <casey@...aufler-ca.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: commit b9ef5513c99b breaks ping to ipv6 linklocal addresses on
 debian buster

On 2020/01/07 1:41, David Ahern wrote:
>>>  #ifdef SMACK_IPV6_SECMARK_LABELING
>>>                 rsp = smack_ipv6host_label(sip);
>>>
>>>
>>> ie., if the socket family is AF_INET6 the address length should be an
>>> IPv6 address. The family in the sockaddr is not as important.
>>>
>>
>> Commit b9ef5513c99b was wrong, but we need to also fix commit c673944347ed ?
>>
> 
> not sure. I have not seen a problem related to it yet.
> 

A sample program shown below is expected to return 0.
Casey, what does smack wants to do for IPv4 address on IPv6 socket case?

----------
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <arpa/inet.h>
#include <unistd.h>

int main(int argc, char *argv[])
{
        const int fd1 = socket(PF_INET6, SOCK_DGRAM, 0);
        const int fd2 = socket(PF_INET, SOCK_DGRAM, 0);
        struct sockaddr_in addr1 = {
                .sin_family = AF_INET,
                .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
                .sin_port = htons(10000)
        };
        struct sockaddr_in addr2 = { };
        char c = 0;
        struct iovec iov1 = { "", 1 };
        struct iovec iov2 = { &c, 1 };
        const struct msghdr msg1 = {
                .msg_iov = &iov1,
                .msg_iovlen = 1,
                .msg_name = &addr1,
                .msg_namelen = sizeof(addr1)
        };
        struct msghdr msg2 = {
                .msg_iov = &iov2,
                .msg_iovlen = 1,
                .msg_name = &addr2,
                .msg_namelen = sizeof(addr2)
        };
        if (bind(fd2, (struct sockaddr *) &addr1, sizeof(addr1)))
                return 1;
        if (sendmsg(fd1, &msg1, 0) != 1 || recvmsg(fd2, &msg2, 0) != 1)
                return 1;
        if (connect(fd1, (struct sockaddr *) &addr1, sizeof(addr1)))
                return 1;
        if (send(fd1, "", 1, 0) != 1 || recv(fd2, &c, 1, 0) != 1)
                return 1;
        return 0;
}
----------