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[204.195.22.127]) by smtp.gmail.com with ESMTPSA id j24sm6834346pji.20.2020.04.06.08.03.51 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Apr 2020 08:03:52 -0700 (PDT) Date: Mon, 6 Apr 2020 08:03:43 -0700 From: Stephen Hemminger To: netdev@vger.kernel.org Subject: Fw: [Bug 207097] New: recvmsg returning buffer filled with zeros Message-ID: <20200406080343.2a0c4e7b@hermes.lan> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This is most likely just a programming error in the sample application. Someone want to investigate it? Begin forwarded message: Date: Sat, 04 Apr 2020 11:00:23 +0000 From: bugzilla-daemon@bugzilla.kernel.org To: stephen@networkplumber.org Subject: [Bug 207097] New: recvmsg returning buffer filled with zeros https://bugzilla.kernel.org/show_bug.cgi?id=207097 Bug ID: 207097 Summary: recvmsg returning buffer filled with zeros Product: Networking Version: 2.5 Kernel Version: 5.3.0-46-generic Hardware: All OS: Linux Tree: Mainline Status: NEW Severity: blocking Priority: P1 Component: Other Assignee: stephen@networkplumber.org Reporter: Lvenkatakumarchakka@gmail.com Regression: No I am creating socket as follows: ============================= static void create_new_read_socket( const uint64_t card_pos ) { const int read_sock = available_cards[card_pos].read_socket = socket( PF_PACKET, SOCK_RAW|SOCK_NONBLOCK, htons( ETH_P_ALL ) ); if( read_sock < 0 ) { fprintf( stderr, "%s %d Unable to create read_sock", __func__, __LINE__ ); return; } struct ifreq ifr; strncpy( ifr.ifr_name, available_cards[card_pos].card_name, IFNAMSIZ ); if( ioctl( read_sock, SIOCGIFFLAGS, &ifr ) == -1 ) { fprintf( stderr, "%s %d Unable to get flag", __func__, __LINE__ ); return; } available_cards[card_pos].ifr_flags_backup = ifr.ifr_flags; ifr.ifr_flags |= ( IFF_PROMISC | IFF_UP ); if( ioctl( read_sock, SIOCSIFFLAGS, &ifr ) == -1 ) { fprintf( stderr, "%s %d Unable to set promiscious flag", __func__, __LINE__ ); return; } struct sockaddr_ll ll = { .sll_family = PF_PACKET, .sll_protocol = htons(ETH_P_ALL), .sll_ifindex = (int)available_cards[card_pos].index }; if( bind( read_sock, (struct sockaddr *) &ll, sizeof(ll) ) < 0 ) { fprintf( stderr, "%s %d Unable to bind", __func__, __LINE__ ); return; } const int one = 1; if( setsockopt( read_sock, SOL_PACKET, PACKET_AUXDATA, &one, sizeof(one)) < 0 ) { fprintf( stderr, "%s %d Unable to setsockopt PACKET_AUXDATA", __func__, __LINE__ ); return; } } ============================= reading the packet as follows: ============================= read_return = recvmsg( read_socket, &msg, MSG_DONTWAIT ); ============================= I am seeing recvmsg is returning buffer filled with zeros but returning size is accurate. -- You are receiving this mail because: You are the assignee for the bug.