Get interface MAC address in sys_accept4() syscall
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From: Guram Z. Savinov on 29 Jul 2010 19:50 Hi all, in net/socket.c is syscall sys_accept4(). In it syscall I need to get MAC address of interface, from connection is come. For example it is two interfaces eth0 and eth1. I want to know, from what interface connection is come to sys_accept4(). Please help me, how I can do it. Thank's for attention for my question. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Guram Z. Savinov on 29 Jul 2010 20:00 30.07.2010 03:42, Guram Z. Savinov пишет: > Hi all, > > in net/socket.c is syscall sys_accept4(). In it syscall I need to get > MAC address of interface, from connection is come. > For example it is two interfaces eth0 and eth1. I want to know, from > what interface connection is come to sys_accept4(). > Please help me, how I can do it. > > Thank's for attention for my question. I forget tell: kernel version: 2.6.28 Here is code of sys_accept4() syscall, in it I need get MAC address of interface: /* * For accept, we attempt to create a new socket, set up the link * with the client, wake up the client, then return the new * connected fd. We collect the address of the connector in kernel * space and move it to user at the very end. This is unclean because * we open the socket then return an error. * * 1003.1g adds the ability to recvmsg() to query connection pending * status to recvmsg. We need to add that support in a way thats * clean when we restucture accept also. */ asmlinkage long sys_accept4(int fd, struct sockaddr __user *upeer_sockaddr, int __user *upeer_addrlen, int flags) { struct socket *sock, *newsock; struct file *newfile; int err, len, newfd, fput_needed; struct sockaddr_storage address; if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) return -EINVAL; if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; sock = sockfd_lookup_light(fd, &err, &fput_needed); if (!sock) goto out; err = -ENFILE; if (!(newsock = sock_alloc())) goto out_put; newsock->type = sock->type; newsock->ops = sock->ops; /* * We don't need try_module_get here, as the listening socket (sock) * has the protocol module (sock->ops->owner) held. */ __module_get(newsock->ops->owner); newfd = sock_alloc_fd(&newfile, flags & O_CLOEXEC); if (unlikely(newfd < 0)) { err = newfd; sock_release(newsock); goto out_put; } err = sock_attach_fd(newsock, newfile, flags & O_NONBLOCK); if (err < 0) goto out_fd_simple; err = security_socket_accept(sock, newsock); if (err) goto out_fd; err = sock->ops->accept(sock, newsock, sock->file->f_flags); if (err < 0) goto out_fd; if (upeer_sockaddr) { if (newsock->ops->getname(newsock, (struct sockaddr *)&address, &len, 2) < 0) { err = -ECONNABORTED; goto out_fd; } err = move_addr_to_user((struct sockaddr *)&address, len, upeer_sockaddr, upeer_addrlen); if (err < 0) goto out_fd; } /* File flags are not inherited via accept() unlike another OSes. */ fd_install(newfd, newfile); err = newfd; security_socket_post_accept(sock, newsock); out_put: fput_light(sock->file, fput_needed); out: return err; out_fd_simple: sock_release(newsock); put_filp(newfile); put_unused_fd(newfd); goto out_put; out_fd: fput(newfile); put_unused_fd(newfd); goto out_put; } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Américo Wang on 30 Jul 2010 03:20 On Fri, Jul 30, 2010 at 03:42:14AM +0400, Guram Z. Savinov wrote: >Hi all, > >in net/socket.c is syscall sys_accept4(). In it syscall I need to get >MAC address of interface, from connection is come. >For example it is two interfaces eth0 and eth1. I want to know, from >what interface connection is come to sys_accept4(). >Please help me, how I can do it. > It is not obtained from accept(2), you get it with ioctl SIOCGIFHWADDR. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Américo Wang on 30 Jul 2010 06:00 On Fri, Jul 30, 2010 at 01:56:06PM +0400, Гурам Савинов wrote: >I want to change syscall sys_accept4(), to return MAC address. >It is possible to get MAC from incomming socket in sys_accept4(), with help >ioctl SIOCGIFHWADDR? > The problem is that it doesn't make sense to do this. accept(2) works on high level sockets, should not bother low level MAC addresses. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Guram Z. Savinov on 30 Jul 2010 06:30
Yes, I know, but sys_accept4() have int fd argument, that is socket descriptor, can I work with it like raw socket and get MAC from ethernet frame? 2010/7/30 Américo Wang <xiyou.wangcong(a)gmail.com> > > On Fri, Jul 30, 2010 at 01:56:06PM +0400, Гурам Савинов wrote: > >I want to change syscall sys_accept4(), to return MAC address. > >It is possible to get MAC from incomming socket in sys_accept4(), with help > >ioctl SIOCGIFHWADDR? > > > > The problem is that it doesn't make sense to do this. > > accept(2) works on high level sockets, should not bother low level > MAC addresses. > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |