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-rw-r--r--firmware/zpu/lib/net_common.c479
1 files changed, 479 insertions, 0 deletions
diff --git a/firmware/zpu/lib/net_common.c b/firmware/zpu/lib/net_common.c
new file mode 100644
index 000000000..42e365393
--- /dev/null
+++ b/firmware/zpu/lib/net_common.c
@@ -0,0 +1,479 @@
+/*
+ * Copyright 2009-2011 Ettus Research LLC
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include "net_common.h"
+#include "banal.h"
+#include <hal_io.h>
+#include <memory_map.h>
+#include <memcpy_wa.h>
+#include <ethernet.h>
+#include <net/padded_eth_hdr.h>
+#include <lwip/ip.h>
+#include <lwip/udp.h>
+#include <lwip/icmp.h>
+#include <stdlib.h>
+#include <nonstdio.h>
+#include "arp_cache.h"
+#include "if_arp.h"
+#include <ethertype.h>
+#include <string.h>
+#include "pkt_ctrl.h"
+
+/***********************************************************************
+ * Constants + Globals
+ **********************************************************************/
+static const bool debug = false;
+static const size_t out_buff_size = 2048;
+static const eth_mac_addr_t BCAST_MAC_ADDR = {{0xff, 0xff, 0xff, 0xff, 0xff, 0xff}};
+#define MAX_UDP_LISTENERS 10
+
+/***********************************************************************
+ * 16-bit one's complement sum
+ **********************************************************************/
+static uint32_t chksum_buffer(
+ uint16_t *buf, size_t nshorts,
+ uint32_t initial_chksum
+){
+ uint32_t chksum = initial_chksum;
+ for (size_t i = 0; i < nshorts; i++) chksum += buf[i];
+
+ while (chksum >> 16) chksum = (chksum & 0xffff) + (chksum >> 16);
+
+ return chksum;
+}
+
+/***********************************************************************
+ * Listener registry
+ **********************************************************************/
+static eth_mac_addr_t _local_mac_addr;
+static struct ip_addr _local_ip_addr;
+void register_addrs(const eth_mac_addr_t *mac_addr, const struct ip_addr *ip_addr){
+ _local_mac_addr = *mac_addr;
+ _local_ip_addr = *ip_addr;
+}
+
+struct listener_entry {
+ unsigned short port;
+ udp_receiver_t rcvr;
+};
+
+static struct listener_entry listeners[MAX_UDP_LISTENERS];
+
+void init_udp_listeners(void){
+ for (int i = 0; i < MAX_UDP_LISTENERS; i++){
+ listeners[i].rcvr = NULL;
+ }
+}
+
+static struct listener_entry *
+find_listener_by_port(unsigned short port)
+{
+ for (int i = 0; i < MAX_UDP_LISTENERS; i++){
+ if (port == listeners[i].port)
+ return &listeners[i];
+ }
+ return 0;
+}
+
+static struct listener_entry *
+find_free_listener(void)
+{
+ for (int i = 0; i < MAX_UDP_LISTENERS; i++){
+ if (listeners[i].rcvr == NULL)
+ return &listeners[i];
+ }
+ abort();
+}
+
+void
+register_udp_listener(int port, udp_receiver_t rcvr)
+{
+ struct listener_entry *lx = find_listener_by_port(port);
+ if (lx)
+ lx->rcvr = rcvr;
+ else {
+ lx = find_free_listener();
+ lx->port = port;
+ lx->rcvr = rcvr;
+ }
+}
+
+/***********************************************************************
+ * Protocol framer
+ **********************************************************************/
+void setup_framer(
+ eth_mac_addr_t eth_dst,
+ eth_mac_addr_t eth_src,
+ struct socket_address sock_dst,
+ struct socket_address sock_src,
+ size_t which
+){
+ struct {
+ padded_eth_hdr_t eth;
+ struct ip_hdr ip;
+ struct udp_hdr udp;
+ } frame;
+
+ //-- load Ethernet header --//
+ frame.eth.dst = eth_dst;
+ frame.eth.src = eth_src;
+ frame.eth.ethertype = ETHERTYPE_IPV4;
+
+ //-- load IPv4 header --//
+ IPH_VHLTOS_SET(&frame.ip, 4, 5, 0);
+ IPH_LEN_SET(&frame.ip, 0);
+ IPH_ID_SET(&frame.ip, 0);
+ IPH_OFFSET_SET(&frame.ip, IP_DF); // don't fragment
+ IPH_TTL_SET(&frame.ip, 32);
+ IPH_PROTO_SET(&frame.ip, IP_PROTO_UDP);
+ IPH_CHKSUM_SET(&frame.ip, 0);
+ frame.ip.src = sock_src.addr;
+ frame.ip.dest = sock_dst.addr;
+ IPH_CHKSUM_SET(&frame.ip, chksum_buffer(
+ (unsigned short *) &frame.ip,
+ sizeof(frame.ip)/sizeof(short), 0
+ ));
+
+ //-- load UDP header --//
+ frame.udp.src = sock_src.port;
+ frame.udp.dest = sock_dst.port;
+ frame.udp.len = 0;
+ frame.udp.chksum = 0;
+
+ //copy into the framer table registers
+ memcpy_wa((void *)(sr_proto_framer_regs->table[which].entry + 1), &frame, sizeof(frame));
+}
+
+/***********************************************************************
+ * Slow-path packet framing and transmission
+ **********************************************************************/
+/*!
+ * low level routine to assembly an ethernet frame and send it.
+ *
+ * \param dst destination mac address
+ * \param ethertype ethertype field
+ * \param buf0 first part of data
+ * \param len0 length of first part of data
+ * \param buf1 second part of data
+ * \param len1 length of second part of data
+ * \param buf2 third part of data
+ * \param len2 length of third part of data
+ */
+static void
+send_pkt(
+ eth_mac_addr_t dst, int ethertype,
+ const void *buf0, size_t len0,
+ const void *buf1, size_t len1,
+ const void *buf2, size_t len2
+){
+
+ //control word for framed data
+ uint32_t ctrl_word = 0x0;
+
+ //assemble the ethernet header
+ padded_eth_hdr_t ehdr;
+ ehdr.pad = 0;
+ ehdr.dst = dst;
+ ehdr.src = _local_mac_addr;
+ ehdr.ethertype = ethertype;
+
+ //grab an out buffer and pointer
+ uint8_t *buff = (uint8_t *)pkt_ctrl_claim_outgoing_buffer();
+ uint8_t *p = buff;
+ size_t total_len = 0;
+
+ //create a list of all buffers to copy
+ const void *buffs[] = {&ctrl_word, &ehdr, buf0, buf1, buf2};
+ size_t lens[] = {sizeof(ctrl_word), sizeof(ehdr), len0, len1, (len2 + 3) & ~3};
+
+ //copy each buffer into the out buffer
+ for (size_t i = 0; i < sizeof(buffs)/sizeof(buffs[0]); i++){
+ total_len += lens[i]; //use full length (not clipped)
+ size_t bytes_remaining = out_buff_size - (size_t)(p - buff);
+ if (lens[i] > bytes_remaining) lens[i] = bytes_remaining;
+ if (lens[i] && ((lens[i] & 0x3) || (intptr_t) buffs[i] & 0x3))
+ printf("send_pkt: bad alignment of len and/or buf\n");
+ memcpy_wa(p, buffs[i], lens[i]);
+ p += lens[i];
+ }
+
+ //ensure that minimum length requirements are met
+ if (total_len < 64) total_len = 64; //60 + ctrl word
+
+ pkt_ctrl_commit_outgoing_buffer(total_len/sizeof(uint32_t));
+ if (debug) printf("sent %d bytes\n", (int)total_len);
+}
+
+void
+send_ip_pkt(struct ip_addr dst, int protocol,
+ const void *buf0, size_t len0,
+ const void *buf1, size_t len1)
+{
+ struct ip_hdr ip;
+ IPH_VHLTOS_SET(&ip, 4, 5, 0);
+ IPH_LEN_SET(&ip, IP_HLEN + len0 + len1);
+ IPH_ID_SET(&ip, 0);
+ IPH_OFFSET_SET(&ip, IP_DF); /* don't fragment */
+ IPH_TTL_SET(&ip, 32);
+ IPH_PROTO_SET(&ip, protocol);
+ IPH_CHKSUM_SET(&ip, 0);
+ ip.src = _local_ip_addr;
+ ip.dest = dst;
+
+ IPH_CHKSUM_SET(&ip, ~chksum_buffer(
+ (unsigned short *) &ip, sizeof(ip)/sizeof(short), 0
+ ));
+
+ eth_mac_addr_t dst_mac;
+ bool found = arp_cache_lookup_mac(&ip.dest, &dst_mac);
+ if (!found){
+ printf("net_common: failed to hit cache looking for ");
+ print_ip_addr(&ip.dest);
+ newline();
+ return;
+ }
+
+ send_pkt(dst_mac, ETHERTYPE_IPV4,
+ &ip, sizeof(ip), buf0, len0, buf1, len1);
+}
+
+void
+send_udp_pkt(int src_port, struct socket_address dst,
+ const void *buf, size_t len)
+{
+ struct udp_hdr udp _AL4;
+ udp.src = src_port;
+ udp.dest = dst.port;
+ udp.len = UDP_HLEN + len;
+ udp.chksum = 0;
+
+ send_ip_pkt(dst.addr, IP_PROTO_UDP,
+ &udp, sizeof(udp), buf, len);
+}
+
+static void
+handle_udp_packet(struct ip_addr src_ip, struct ip_addr dst_ip,
+ struct udp_hdr *udp, size_t len)
+{
+ if (len != udp->len){
+ printf("UDP inconsistent lengths: %d %d\n", (int)len, udp->len);
+ return;
+ }
+
+ unsigned char *payload = ((unsigned char *) udp) + UDP_HLEN;
+ int payload_len = len - UDP_HLEN;
+
+ if (0){
+ printf("\nUDP: src = %d dst = %d len = %d\n",
+ udp->src, udp->dest, udp->len);
+
+ //print_bytes(0, payload, payload_len);
+ }
+
+ struct listener_entry *lx = find_listener_by_port(udp->dest);
+ if (lx){
+ struct socket_address src = make_socket_address(src_ip, udp->src);
+ struct socket_address dst = make_socket_address(dst_ip, udp->dest);
+ lx->rcvr(src, dst, payload, payload_len);
+ }
+}
+
+static void
+handle_icmp_packet(struct ip_addr src, struct ip_addr dst,
+ struct icmp_echo_hdr *icmp, size_t len)
+{
+ switch (icmp->type){
+ case ICMP_DUR: // Destinatino Unreachable
+ if (icmp->code == ICMP_DUR_PORT){ // port unreachable
+ //handle destination port unreachable (the host ctrl+c'd the app):
+
+ //filter out non udp data response
+ struct ip_hdr *ip = (struct ip_hdr *)(((uint8_t*)icmp) + sizeof(struct icmp_echo_hdr));
+ struct udp_hdr *udp = (struct udp_hdr *)(((char *)ip) + IP_HLEN);
+ if (IPH_PROTO(ip) != IP_PROTO_UDP) break;
+
+ struct listener_entry *lx = find_listener_by_port(udp->src);
+ if (lx){
+ struct socket_address src = make_socket_address(ip->src, udp->src);
+ struct socket_address dst = make_socket_address(ip->dest, udp->dest);
+ lx->rcvr(src, dst, NULL, 0);
+ }
+
+ putchar('i');
+ }
+ else {
+ //printf("icmp dst unr (code: %d)", icmp->code);
+ putchar('i');
+ }
+ break;
+
+ case ICMP_ECHO:{
+ const void *icmp_data_buff = ((uint8_t*)icmp) + sizeof(struct icmp_echo_hdr);
+ size_t icmp_data_len = len - sizeof(struct icmp_echo_hdr);
+
+ struct icmp_echo_hdr echo_reply;
+ echo_reply.type = 0;
+ echo_reply.code = 0;
+ echo_reply.chksum = 0;
+ echo_reply.id = icmp->id;
+ echo_reply.seqno = icmp->seqno;
+ echo_reply.chksum = ~chksum_buffer( //data checksum
+ (unsigned short *)icmp_data_buff,
+ icmp_data_len/sizeof(short),
+ chksum_buffer( //header checksum
+ (unsigned short *)&echo_reply,
+ sizeof(echo_reply)/sizeof(short),
+ 0)
+ );
+
+ send_ip_pkt(
+ src, IP_PROTO_ICMP,
+ &echo_reply, sizeof(echo_reply),
+ icmp_data_buff, icmp_data_len
+ );
+ break;
+ }
+ default:
+ break;
+ }
+}
+
+static void
+send_arp_reply(struct arp_eth_ipv4 *req, eth_mac_addr_t our_mac)
+{
+ struct arp_eth_ipv4 reply _AL4;
+ reply.ar_hrd = req->ar_hrd;
+ reply.ar_pro = req->ar_pro;
+ reply.ar_hln = req->ar_hln;
+ reply.ar_pln = req->ar_pln;
+ reply.ar_op = ARPOP_REPLY;
+ memcpy(reply.ar_sha, &our_mac, 6);
+ memcpy(reply.ar_sip, req->ar_tip, 4);
+ memcpy(reply.ar_tha, req->ar_sha, 6);
+ memcpy(reply.ar_tip, req->ar_sip, 4);
+
+ eth_mac_addr_t t;
+ memcpy(t.addr, reply.ar_tha, 6);
+ send_pkt(t, ETHERTYPE_ARP, &reply, sizeof(reply), 0, 0, 0, 0);
+}
+
+void send_gratuitous_arp(void){
+ struct arp_eth_ipv4 req _AL4;
+ req.ar_hrd = ARPHRD_ETHER;
+ req.ar_pro = ETHERTYPE_IPV4;
+ req.ar_hln = sizeof(eth_mac_addr_t);
+ req.ar_pln = sizeof(struct ip_addr);
+ req.ar_op = ARPOP_REQUEST;
+ memcpy(req.ar_sha, ethernet_mac_addr(), sizeof(eth_mac_addr_t));
+ memcpy(req.ar_sip, get_ip_addr(), sizeof(struct ip_addr));
+ memset(req.ar_tha, 0x00, sizeof(eth_mac_addr_t));
+ memcpy(req.ar_tip, get_ip_addr(), sizeof(struct ip_addr));
+
+ //send the request with a broadcast ethernet mac address
+ send_pkt(BCAST_MAC_ADDR, ETHERTYPE_ARP, &req, sizeof(req), 0, 0, 0, 0);
+}
+
+static void
+handle_arp_packet(struct arp_eth_ipv4 *p, size_t size)
+{
+ if (size < sizeof(struct arp_eth_ipv4)){
+ printf("\nhandle_arp: weird size = %d\n", (int)size);
+ return;
+ }
+
+ if (0){
+ printf("ar_hrd = %d\n", p->ar_hrd);
+ printf("ar_pro = %d\n", p->ar_pro);
+ printf("ar_hln = %d\n", p->ar_hln);
+ printf("ar_pln = %d\n", p->ar_pln);
+ printf("ar_op = %d\n", p->ar_op);
+ printf("ar_sha = "); print_mac_addr(p->ar_sha); newline();
+ printf("ar_sip = "); print_ip_addr (p->ar_sip); newline();
+ printf("ar_tha = "); print_mac_addr(p->ar_tha); newline();
+ printf("ar_tip = "); print_ip_addr (p->ar_tip); newline();
+ }
+
+ if (p->ar_hrd != ARPHRD_ETHER
+ || p->ar_pro != ETHERTYPE_IPV4
+ || p->ar_hln != 6
+ || p->ar_pln != 4)
+ return;
+
+ if (p->ar_op != ARPOP_REQUEST)
+ return;
+
+ struct ip_addr sip;
+ struct ip_addr tip;
+
+ sip.addr = get_int32(p->ar_sip);
+ tip.addr = get_int32(p->ar_tip);
+
+ if (memcmp(&tip, &_local_ip_addr, sizeof(_local_ip_addr)) == 0){ // They're looking for us...
+ send_arp_reply(p, _local_mac_addr);
+ }
+}
+
+void
+handle_eth_packet(uint32_t *p, size_t nlines)
+{
+ static size_t bcount = 0;
+ if (debug) printf("===> %d\n", (int)bcount++);
+ if (debug) print_buffer(p, nlines);
+
+ padded_eth_hdr_t *eth_hdr = (padded_eth_hdr_t *)p;
+
+ if (eth_hdr->ethertype == ETHERTYPE_ARP){
+ struct arp_eth_ipv4 *arp = (struct arp_eth_ipv4 *)(p + 4);
+ handle_arp_packet(arp, nlines*sizeof(uint32_t) - 14);
+ }
+ else if (eth_hdr->ethertype == ETHERTYPE_IPV4){
+ struct ip_hdr *ip = (struct ip_hdr *)(p + 4);
+ if (IPH_V(ip) != 4 || IPH_HL(ip) != 5) // ignore pkts w/ bad version or options
+ return;
+
+ if (IPH_OFFSET(ip) & (IP_MF | IP_OFFMASK)) // ignore fragmented packets
+ return;
+
+ // filter on dest ip addr (should be broadcast or for us)
+ bool is_bcast = memcmp(&eth_hdr->dst, &BCAST_MAC_ADDR, sizeof(BCAST_MAC_ADDR)) == 0;
+ bool is_my_ip = memcmp(&ip->dest, &_local_ip_addr, sizeof(_local_ip_addr)) == 0;
+ if (!is_bcast && !is_my_ip) return;
+
+ arp_cache_update(&ip->src, (eth_mac_addr_t *)(((char *)p)+8));
+
+ int protocol = IPH_PROTO(ip);
+ int len = IPH_LEN(ip) - IP_HLEN;
+
+ switch (protocol){
+ case IP_PROTO_UDP:
+ handle_udp_packet(ip->src, ip->dest, (struct udp_hdr *)(((char *)ip) + IP_HLEN), len);
+ break;
+
+ case IP_PROTO_ICMP:
+ handle_icmp_packet(ip->src, ip->dest, (struct icmp_echo_hdr *)(((char *)ip) + IP_HLEN), len);
+ break;
+
+ default: // ignore
+ break;
+ }
+ }
+ else
+ return; // Not ARP or IPV4, ignore
+}
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