Make the behavior of the send function reusable.
Signed-off-by: Joe Hershberger joe.hershberger@ni.com
---
Changes in v2: - Added parameter comments - Changed return value to use typical error approach - In test, stop calling reply functions when one matches
arch/sandbox/include/asm/eth.h | 26 ++++++ drivers/net/sandbox.c | 180 ++++++++++++++++++++++++----------------- 2 files changed, 132 insertions(+), 74 deletions(-)
diff --git a/arch/sandbox/include/asm/eth.h b/arch/sandbox/include/asm/eth.h index bfcd11b593..3dc84f0e4b 100644 --- a/arch/sandbox/include/asm/eth.h +++ b/arch/sandbox/include/asm/eth.h @@ -13,4 +13,30 @@ void sandbox_eth_disable_response(int index, bool disable);
void sandbox_eth_skip_timeout(void);
+/* + * sandbox_eth_arp_req_to_reply() + * + * Check for an arp request to be sent. If so, inject a reply + * + * @dev: device that received the packet + * @packet: pointer to the received pacaket buffer + * @len: length of received packet + * @return 0 if injected, -EAGAIN if not + */ +int sandbox_eth_arp_req_to_reply(struct udevice *dev, void *packet, + unsigned int len); + +/* + * sandbox_eth_ping_req_to_reply() + * + * Check for a ping request to be sent. If so, inject a reply + * + * @dev: device that received the packet + * @packet: pointer to the received pacaket buffer + * @len: length of received packet + * @return 0 if injected, -EAGAIN if not + */ +int sandbox_eth_ping_req_to_reply(struct udevice *dev, void *packet, + unsigned int len); + #endif /* __ETH_H */ diff --git a/drivers/net/sandbox.c b/drivers/net/sandbox.c index 60fe065ee5..c472261568 100644 --- a/drivers/net/sandbox.c +++ b/drivers/net/sandbox.c @@ -63,6 +63,108 @@ void sandbox_eth_skip_timeout(void) skip_timeout = true; }
+/* + * sandbox_eth_arp_req_to_reply() + * + * Check for an arp request to be sent. If so, inject a reply + * + * returns 0 if injected, -EAGAIN if not + */ +int sandbox_eth_arp_req_to_reply(struct udevice *dev, void *packet, + unsigned int len) +{ + struct eth_sandbox_priv *priv = dev_get_priv(dev); + struct ethernet_hdr *eth = packet; + struct arp_hdr *arp; + struct ethernet_hdr *eth_recv; + struct arp_hdr *arp_recv; + + if (ntohs(eth->et_protlen) != PROT_ARP) + return -EAGAIN; + + arp = packet + ETHER_HDR_SIZE; + + if (ntohs(arp->ar_op) != ARPOP_REQUEST) + return -EAGAIN; + + /* store this as the assumed IP of the fake host */ + priv->fake_host_ipaddr = net_read_ip(&arp->ar_tpa); + + /* Formulate a fake response */ + eth_recv = (void *)priv->recv_packet_buffer; + memcpy(eth_recv->et_dest, eth->et_src, ARP_HLEN); + memcpy(eth_recv->et_src, priv->fake_host_hwaddr, ARP_HLEN); + eth_recv->et_protlen = htons(PROT_ARP); + + arp_recv = (void *)eth_recv + ETHER_HDR_SIZE; + arp_recv->ar_hrd = htons(ARP_ETHER); + arp_recv->ar_pro = htons(PROT_IP); + arp_recv->ar_hln = ARP_HLEN; + arp_recv->ar_pln = ARP_PLEN; + arp_recv->ar_op = htons(ARPOP_REPLY); + memcpy(&arp_recv->ar_sha, priv->fake_host_hwaddr, ARP_HLEN); + net_write_ip(&arp_recv->ar_spa, priv->fake_host_ipaddr); + memcpy(&arp_recv->ar_tha, &arp->ar_sha, ARP_HLEN); + net_copy_ip(&arp_recv->ar_tpa, &arp->ar_spa); + + priv->recv_packet_length = ETHER_HDR_SIZE + ARP_HDR_SIZE; + + return 0; +} + +/* + * sandbox_eth_ping_req_to_reply() + * + * Check for a ping request to be sent. If so, inject a reply + * + * returns 0 if injected, -EAGAIN if not + */ +int sandbox_eth_ping_req_to_reply(struct udevice *dev, void *packet, + unsigned int len) +{ + struct eth_sandbox_priv *priv = dev_get_priv(dev); + struct ethernet_hdr *eth = packet; + struct ip_udp_hdr *ip; + struct icmp_hdr *icmp; + struct ethernet_hdr *eth_recv; + struct ip_udp_hdr *ipr; + struct icmp_hdr *icmpr; + + if (ntohs(eth->et_protlen) != PROT_IP) + return -EAGAIN; + + ip = packet + ETHER_HDR_SIZE; + + if (ip->ip_p != IPPROTO_ICMP) + return -EAGAIN; + + icmp = (struct icmp_hdr *)&ip->udp_src; + + if (icmp->type != ICMP_ECHO_REQUEST) + return -EAGAIN; + + /* reply to the ping */ + eth_recv = (void *)priv->recv_packet_buffer; + memcpy(eth_recv, packet, len); + ipr = (void *)eth_recv + ETHER_HDR_SIZE; + icmpr = (struct icmp_hdr *)&ipr->udp_src; + memcpy(eth_recv->et_dest, eth->et_src, ARP_HLEN); + memcpy(eth_recv->et_src, priv->fake_host_hwaddr, ARP_HLEN); + ipr->ip_sum = 0; + ipr->ip_off = 0; + net_copy_ip((void *)&ipr->ip_dst, &ip->ip_src); + net_write_ip((void *)&ipr->ip_src, priv->fake_host_ipaddr); + ipr->ip_sum = compute_ip_checksum(ipr, IP_HDR_SIZE); + + icmpr->type = ICMP_ECHO_REPLY; + icmpr->checksum = 0; + icmpr->checksum = compute_ip_checksum(icmpr, ICMP_HDR_SIZE); + + priv->recv_packet_length = len; + + return 0; +} + static int sb_eth_start(struct udevice *dev) { struct eth_sandbox_priv *priv = dev_get_priv(dev); @@ -77,86 +179,16 @@ static int sb_eth_start(struct udevice *dev) static int sb_eth_send(struct udevice *dev, void *packet, int length) { struct eth_sandbox_priv *priv = dev_get_priv(dev); - struct ethernet_hdr *eth = packet;
debug("eth_sandbox: Send packet %d\n", length);
if (priv->disabled) return 0;
- if (ntohs(eth->et_protlen) == PROT_ARP) { - struct arp_hdr *arp = packet + ETHER_HDR_SIZE; - - if (ntohs(arp->ar_op) == ARPOP_REQUEST) { - struct ethernet_hdr *eth_recv; - struct arp_hdr *arp_recv; - - /* store this as the assumed IP of the fake host */ - priv->fake_host_ipaddr = net_read_ip(&arp->ar_tpa); - /* Formulate a fake response */ - eth_recv = (void *)priv->recv_packet_buffer; - memcpy(eth_recv->et_dest, eth->et_src, ARP_HLEN); - memcpy(eth_recv->et_src, priv->fake_host_hwaddr, - ARP_HLEN); - eth_recv->et_protlen = htons(PROT_ARP); - - arp_recv = (void *)priv->recv_packet_buffer + - ETHER_HDR_SIZE; - arp_recv->ar_hrd = htons(ARP_ETHER); - arp_recv->ar_pro = htons(PROT_IP); - arp_recv->ar_hln = ARP_HLEN; - arp_recv->ar_pln = ARP_PLEN; - arp_recv->ar_op = htons(ARPOP_REPLY); - memcpy(&arp_recv->ar_sha, priv->fake_host_hwaddr, - ARP_HLEN); - net_write_ip(&arp_recv->ar_spa, priv->fake_host_ipaddr); - memcpy(&arp_recv->ar_tha, &arp->ar_sha, ARP_HLEN); - net_copy_ip(&arp_recv->ar_tpa, &arp->ar_spa); - - priv->recv_packet_length = ETHER_HDR_SIZE + - ARP_HDR_SIZE; - } - } else if (ntohs(eth->et_protlen) == PROT_IP) { - struct ip_udp_hdr *ip = packet + ETHER_HDR_SIZE; - - if (ip->ip_p == IPPROTO_ICMP) { - struct icmp_hdr *icmp = (struct icmp_hdr *)&ip->udp_src; - - if (icmp->type == ICMP_ECHO_REQUEST) { - struct ethernet_hdr *eth_recv; - struct ip_udp_hdr *ipr; - struct icmp_hdr *icmpr; - - /* reply to the ping */ - memcpy(priv->recv_packet_buffer, packet, - length); - eth_recv = (void *)priv->recv_packet_buffer; - ipr = (void *)priv->recv_packet_buffer + - ETHER_HDR_SIZE; - icmpr = (struct icmp_hdr *)&ipr->udp_src; - memcpy(eth_recv->et_dest, eth->et_src, - ARP_HLEN); - memcpy(eth_recv->et_src, priv->fake_host_hwaddr, - ARP_HLEN); - ipr->ip_sum = 0; - ipr->ip_off = 0; - net_copy_ip((void *)&ipr->ip_dst, &ip->ip_src); - net_write_ip((void *)&ipr->ip_src, - priv->fake_host_ipaddr); - ipr->ip_sum = compute_ip_checksum(ipr, - IP_HDR_SIZE); - - icmpr->type = ICMP_ECHO_REPLY; - icmpr->checksum = 0; - icmpr->checksum = compute_ip_checksum(icmpr, - ICMP_HDR_SIZE); - - priv->recv_packet_length = length; - } - } - } - - return 0; + if (!sandbox_eth_arp_req_to_reply(dev, packet, length)) + return 0; + if (!sandbox_eth_ping_req_to_reply(dev, packet, length)) + return 0; }
static int sb_eth_recv(struct udevice *dev, int flags, uchar **packetp)