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https://github.com/brain-hackers/u-boot-brain
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![Tom Rini](/assets/img/avatar_default.png)
With more recent gcc versions we otherwise get an error like: note: expected 'const struct sockaddr *' but argument is of type 'struct sockaddr_in *' and the common solution here is to cast, rather than re-work the code. Cc: Joe Hershberger <joe.hershberger@ni.com> Cc: Simon Glass <sjg@chromium.org> Signed-off-by: Tom Rini <trini@konsulko.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Acked-by: Joe Hershberger <joe.hershberger@ni.com>
255 lines
6.8 KiB
C
255 lines
6.8 KiB
C
/*
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* Copyright (c) 2015 National Instruments
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*
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* (C) Copyright 2015
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* Joe Hershberger <joe.hershberger@ni.com>
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*
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* SPDX-License-Identifier: GPL-2.0
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*/
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#include <asm/eth-raw-os.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netinet/ip.h>
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#include <netinet/udp.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <unistd.h>
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#include <arpa/inet.h>
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#include <linux/if_ether.h>
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#include <linux/if_packet.h>
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static int _raw_packet_start(const char *ifname, unsigned char *ethmac,
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struct eth_sandbox_raw_priv *priv)
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{
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struct sockaddr_ll *device;
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struct packet_mreq mr;
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int ret;
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int flags;
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/* Prepare device struct */
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priv->device = malloc(sizeof(struct sockaddr_ll));
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if (priv->device == NULL)
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return -ENOMEM;
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device = priv->device;
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memset(device, 0, sizeof(struct sockaddr_ll));
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device->sll_ifindex = if_nametoindex(ifname);
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device->sll_family = AF_PACKET;
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memcpy(device->sll_addr, ethmac, 6);
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device->sll_halen = htons(6);
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/* Open socket */
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priv->sd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
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if (priv->sd < 0) {
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printf("Failed to open socket: %d %s\n", errno,
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strerror(errno));
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return -errno;
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}
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/* Bind to the specified interface */
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ret = setsockopt(priv->sd, SOL_SOCKET, SO_BINDTODEVICE, ifname,
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strlen(ifname) + 1);
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if (ret < 0) {
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printf("Failed to bind to '%s': %d %s\n", ifname, errno,
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strerror(errno));
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return -errno;
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}
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/* Make the socket non-blocking */
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flags = fcntl(priv->sd, F_GETFL, 0);
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fcntl(priv->sd, F_SETFL, flags | O_NONBLOCK);
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/* Enable promiscuous mode to receive responses meant for us */
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mr.mr_ifindex = device->sll_ifindex;
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mr.mr_type = PACKET_MR_PROMISC;
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ret = setsockopt(priv->sd, SOL_PACKET, PACKET_ADD_MEMBERSHIP,
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&mr, sizeof(mr));
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if (ret < 0) {
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struct ifreq ifr;
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printf("Failed to set promiscuous mode: %d %s\n"
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"Falling back to the old \"flags\" way...\n",
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errno, strerror(errno));
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if (strlen(ifname) >= IFNAMSIZ) {
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printf("Interface name %s is too long.\n", ifname);
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return -EINVAL;
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}
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strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
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if (ioctl(priv->sd, SIOCGIFFLAGS, &ifr) < 0) {
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printf("Failed to read flags: %d %s\n", errno,
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strerror(errno));
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return -errno;
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}
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ifr.ifr_flags |= IFF_PROMISC;
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if (ioctl(priv->sd, SIOCSIFFLAGS, &ifr) < 0) {
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printf("Failed to write flags: %d %s\n", errno,
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strerror(errno));
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return -errno;
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}
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}
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return 0;
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}
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static int _local_inet_start(struct eth_sandbox_raw_priv *priv)
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{
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struct sockaddr_in *device;
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int ret;
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int flags;
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int one = 1;
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/* Prepare device struct */
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priv->device = malloc(sizeof(struct sockaddr_in));
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if (priv->device == NULL)
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return -ENOMEM;
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device = priv->device;
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memset(device, 0, sizeof(struct sockaddr_in));
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device->sin_family = AF_INET;
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device->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
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/**
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* Open socket
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* Since we specify UDP here, any incoming ICMP packets will
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* not be received, so things like ping will not work on this
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* localhost interface.
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*/
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priv->sd = socket(AF_INET, SOCK_RAW, IPPROTO_UDP);
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if (priv->sd < 0) {
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printf("Failed to open socket: %d %s\n", errno,
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strerror(errno));
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return -errno;
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}
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/* Make the socket non-blocking */
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flags = fcntl(priv->sd, F_GETFL, 0);
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fcntl(priv->sd, F_SETFL, flags | O_NONBLOCK);
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/* Include the UDP/IP headers on send and receive */
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ret = setsockopt(priv->sd, IPPROTO_IP, IP_HDRINCL, &one,
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sizeof(one));
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if (ret < 0) {
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printf("Failed to set header include option: %d %s\n", errno,
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strerror(errno));
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return -errno;
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}
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priv->local_bind_sd = -1;
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priv->local_bind_udp_port = 0;
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return 0;
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}
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int sandbox_eth_raw_os_start(const char *ifname, unsigned char *ethmac,
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struct eth_sandbox_raw_priv *priv)
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{
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if (priv->local)
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return _local_inet_start(priv);
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else
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return _raw_packet_start(ifname, ethmac, priv);
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}
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int sandbox_eth_raw_os_send(void *packet, int length,
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struct eth_sandbox_raw_priv *priv)
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{
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int retval;
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struct udphdr *udph = packet + sizeof(struct iphdr);
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if (!priv->sd || !priv->device)
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return -EINVAL;
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/*
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* This block of code came about when testing tftp on the localhost
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* interface. When using the RAW AF_INET API, the network stack is still
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* in play responding to incoming traffic based on open "ports". Since
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* it is raw (at the IP layer, no Ethernet) the network stack tells the
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* TFTP server that the port it responded to is closed. This causes the
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* TFTP transfer to be aborted. This block of code inspects the outgoing
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* packet as formulated by the u-boot network stack to determine the
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* source port (that the TFTP server will send packets back to) and
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* opens a typical UDP socket on that port, thus preventing the network
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* stack from sending that ICMP message claiming that the port has no
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* bound socket.
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*/
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if (priv->local && (priv->local_bind_sd == -1 ||
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priv->local_bind_udp_port != udph->source)) {
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struct iphdr *iph = packet;
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struct sockaddr_in addr;
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if (priv->local_bind_sd != -1)
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close(priv->local_bind_sd);
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/* A normal UDP socket is required to bind */
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priv->local_bind_sd = socket(AF_INET, SOCK_DGRAM, 0);
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if (priv->local_bind_sd < 0) {
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printf("Failed to open bind sd: %d %s\n", errno,
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strerror(errno));
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return -errno;
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}
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priv->local_bind_udp_port = udph->source;
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/**
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* Bind the UDP port that we intend to use as our source port
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* so that the kernel will not send an ICMP port unreachable
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* message to the server
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*/
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addr.sin_family = AF_INET;
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addr.sin_port = udph->source;
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addr.sin_addr.s_addr = iph->saddr;
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retval = bind(priv->local_bind_sd, (struct sockaddr *)&addr,
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sizeof(addr));
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if (retval < 0)
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printf("Failed to bind: %d %s\n", errno,
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strerror(errno));
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}
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retval = sendto(priv->sd, packet, length, 0,
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(struct sockaddr *)priv->device,
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sizeof(struct sockaddr_ll));
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if (retval < 0) {
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printf("Failed to send packet: %d %s\n", errno,
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strerror(errno));
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return -errno;
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}
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return retval;
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}
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int sandbox_eth_raw_os_recv(void *packet, int *length,
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const struct eth_sandbox_raw_priv *priv)
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{
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int retval;
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int saddr_size;
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if (!priv->sd || !priv->device)
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return -EINVAL;
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saddr_size = sizeof(struct sockaddr);
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retval = recvfrom(priv->sd, packet, 1536, 0,
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(struct sockaddr *)priv->device,
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(socklen_t *)&saddr_size);
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*length = 0;
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if (retval >= 0) {
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*length = retval;
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return 0;
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}
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/* The socket is non-blocking, so expect EAGAIN when there is no data */
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if (errno == EAGAIN)
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return 0;
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return -errno;
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}
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void sandbox_eth_raw_os_stop(struct eth_sandbox_raw_priv *priv)
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{
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free(priv->device);
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priv->device = NULL;
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close(priv->sd);
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priv->sd = -1;
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if (priv->local) {
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if (priv->local_bind_sd != -1)
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close(priv->local_bind_sd);
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priv->local_bind_sd = -1;
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priv->local_bind_udp_port = 0;
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}
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}
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