u-boot/net/net.c
Joe Hershberger 60304592b9 net: Improve error handling
Take a pass at plumbing errors through to the users of the network stack

Currently only the start() function errors will be returned from
NetLoop(). recv() tends not to have errors, so that is likely not worth
adding. send() certainly can return errors, but this patch does not
attempt to plumb them yet. halt() is not expected to error.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2015-04-18 11:11:14 -06:00

1489 lines
34 KiB
C

/*
* Copied from Linux Monitor (LiMon) - Networking.
*
* Copyright 1994 - 2000 Neil Russell.
* (See License)
* Copyright 2000 Roland Borde
* Copyright 2000 Paolo Scaffardi
* Copyright 2000-2002 Wolfgang Denk, wd@denx.de
* SPDX-License-Identifier: GPL-2.0
*/
/*
* General Desription:
*
* The user interface supports commands for BOOTP, RARP, and TFTP.
* Also, we support ARP internally. Depending on available data,
* these interact as follows:
*
* BOOTP:
*
* Prerequisites: - own ethernet address
* We want: - own IP address
* - TFTP server IP address
* - name of bootfile
* Next step: ARP
*
* LINK_LOCAL:
*
* Prerequisites: - own ethernet address
* We want: - own IP address
* Next step: ARP
*
* RARP:
*
* Prerequisites: - own ethernet address
* We want: - own IP address
* - TFTP server IP address
* Next step: ARP
*
* ARP:
*
* Prerequisites: - own ethernet address
* - own IP address
* - TFTP server IP address
* We want: - TFTP server ethernet address
* Next step: TFTP
*
* DHCP:
*
* Prerequisites: - own ethernet address
* We want: - IP, Netmask, ServerIP, Gateway IP
* - bootfilename, lease time
* Next step: - TFTP
*
* TFTP:
*
* Prerequisites: - own ethernet address
* - own IP address
* - TFTP server IP address
* - TFTP server ethernet address
* - name of bootfile (if unknown, we use a default name
* derived from our own IP address)
* We want: - load the boot file
* Next step: none
*
* NFS:
*
* Prerequisites: - own ethernet address
* - own IP address
* - name of bootfile (if unknown, we use a default name
* derived from our own IP address)
* We want: - load the boot file
* Next step: none
*
* SNTP:
*
* Prerequisites: - own ethernet address
* - own IP address
* We want: - network time
* Next step: none
*/
#include <common.h>
#include <command.h>
#include <environment.h>
#include <errno.h>
#include <net.h>
#if defined(CONFIG_STATUS_LED)
#include <miiphy.h>
#include <status_led.h>
#endif
#include <watchdog.h>
#include <linux/compiler.h>
#include "arp.h"
#include "bootp.h"
#include "cdp.h"
#if defined(CONFIG_CMD_DNS)
#include "dns.h"
#endif
#include "link_local.h"
#include "nfs.h"
#include "ping.h"
#include "rarp.h"
#if defined(CONFIG_CMD_SNTP)
#include "sntp.h"
#endif
#include "tftp.h"
DECLARE_GLOBAL_DATA_PTR;
/** BOOTP EXTENTIONS **/
/* Our subnet mask (0=unknown) */
IPaddr_t NetOurSubnetMask;
/* Our gateways IP address */
IPaddr_t NetOurGatewayIP;
/* Our DNS IP address */
IPaddr_t NetOurDNSIP;
#if defined(CONFIG_BOOTP_DNS2)
/* Our 2nd DNS IP address */
IPaddr_t NetOurDNS2IP;
#endif
/* Our NIS domain */
char NetOurNISDomain[32] = {0,};
/* Our hostname */
char NetOurHostName[32] = {0,};
/* Our bootpath */
char NetOurRootPath[64] = {0,};
/* Our bootfile size in blocks */
ushort NetBootFileSize;
#ifdef CONFIG_MCAST_TFTP /* Multicast TFTP */
IPaddr_t Mcast_addr;
#endif
/** END OF BOOTP EXTENTIONS **/
/* The actual transferred size of the bootfile (in bytes) */
ulong NetBootFileXferSize;
/* Our ethernet address */
uchar NetOurEther[6];
/* Boot server enet address */
uchar NetServerEther[6];
/* Our IP addr (0 = unknown) */
IPaddr_t NetOurIP;
/* Server IP addr (0 = unknown) */
IPaddr_t NetServerIP;
/* Current receive packet */
uchar *NetRxPacket;
/* Current rx packet length */
int NetRxPacketLen;
/* IP packet ID */
unsigned NetIPID;
/* Ethernet bcast address */
uchar NetBcastAddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
uchar NetEtherNullAddr[6];
#ifdef CONFIG_API
void (*push_packet)(void *, int len) = 0;
#endif
/* Network loop state */
enum net_loop_state net_state;
/* Tried all network devices */
int NetRestartWrap;
/* Network loop restarted */
static int NetRestarted;
/* At least one device configured */
static int NetDevExists;
/* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
/* default is without VLAN */
ushort NetOurVLAN = 0xFFFF;
/* ditto */
ushort NetOurNativeVLAN = 0xFFFF;
/* Boot File name */
char BootFile[128];
#if defined(CONFIG_CMD_SNTP)
/* NTP server IP address */
IPaddr_t NetNtpServerIP;
/* offset time from UTC */
int NetTimeOffset;
#endif
static uchar PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
#ifdef CONFIG_DM_ETH
/* Receive packets */
uchar *net_rx_packets[PKTBUFSRX];
#else
/* Receive packet */
uchar *NetRxPackets[PKTBUFSRX];
#endif
/* Current UDP RX packet handler */
static rxhand_f *udp_packet_handler;
/* Current ARP RX packet handler */
static rxhand_f *arp_packet_handler;
#ifdef CONFIG_CMD_TFTPPUT
/* Current ICMP rx handler */
static rxhand_icmp_f *packet_icmp_handler;
#endif
/* Current timeout handler */
static thand_f *timeHandler;
/* Time base value */
static ulong timeStart;
/* Current timeout value */
static ulong timeDelta;
/* THE transmit packet */
uchar *NetTxPacket;
static int net_check_prereq(enum proto_t protocol);
static int NetTryCount;
int __maybe_unused net_busy_flag;
/**********************************************************************/
static int on_bootfile(const char *name, const char *value, enum env_op op,
int flags)
{
switch (op) {
case env_op_create:
case env_op_overwrite:
copy_filename(BootFile, value, sizeof(BootFile));
break;
default:
break;
}
return 0;
}
U_BOOT_ENV_CALLBACK(bootfile, on_bootfile);
/*
* Check if autoload is enabled. If so, use either NFS or TFTP to download
* the boot file.
*/
void net_auto_load(void)
{
#if defined(CONFIG_CMD_NFS)
const char *s = getenv("autoload");
if (s != NULL && strcmp(s, "NFS") == 0) {
/*
* Use NFS to load the bootfile.
*/
NfsStart();
return;
}
#endif
if (getenv_yesno("autoload") == 0) {
/*
* Just use BOOTP/RARP to configure system;
* Do not use TFTP to load the bootfile.
*/
net_set_state(NETLOOP_SUCCESS);
return;
}
TftpStart(TFTPGET);
}
static void NetInitLoop(void)
{
static int env_changed_id;
int env_id = get_env_id();
/* update only when the environment has changed */
if (env_changed_id != env_id) {
NetOurIP = getenv_IPaddr("ipaddr");
NetOurGatewayIP = getenv_IPaddr("gatewayip");
NetOurSubnetMask = getenv_IPaddr("netmask");
NetServerIP = getenv_IPaddr("serverip");
NetOurNativeVLAN = getenv_VLAN("nvlan");
NetOurVLAN = getenv_VLAN("vlan");
#if defined(CONFIG_CMD_DNS)
NetOurDNSIP = getenv_IPaddr("dnsip");
#endif
env_changed_id = env_id;
}
if (eth_get_dev())
memcpy(NetOurEther, eth_get_ethaddr(), 6);
return;
}
static void net_clear_handlers(void)
{
net_set_udp_handler(NULL);
net_set_arp_handler(NULL);
NetSetTimeout(0, NULL);
}
static void net_cleanup_loop(void)
{
net_clear_handlers();
}
void net_init(void)
{
static int first_call = 1;
if (first_call) {
/*
* Setup packet buffers, aligned correctly.
*/
int i;
NetTxPacket = &PktBuf[0] + (PKTALIGN - 1);
NetTxPacket -= (ulong)NetTxPacket % PKTALIGN;
#ifdef CONFIG_DM_ETH
for (i = 0; i < PKTBUFSRX; i++) {
net_rx_packets[i] = NetTxPacket + (i + 1) *
PKTSIZE_ALIGN;
}
#else
for (i = 0; i < PKTBUFSRX; i++)
NetRxPackets[i] = NetTxPacket + (i + 1) * PKTSIZE_ALIGN;
#endif
ArpInit();
net_clear_handlers();
/* Only need to setup buffer pointers once. */
first_call = 0;
}
NetInitLoop();
}
/**********************************************************************/
/*
* Main network processing loop.
*/
int NetLoop(enum proto_t protocol)
{
int ret = -EINVAL;
NetRestarted = 0;
NetDevExists = 0;
NetTryCount = 1;
debug_cond(DEBUG_INT_STATE, "--- NetLoop Entry\n");
bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start");
net_init();
if (eth_is_on_demand_init() || protocol != NETCONS) {
eth_halt();
eth_set_current();
ret = eth_init();
if (ret < 0) {
eth_halt();
return ret;
}
} else
eth_init_state_only();
restart:
#ifdef CONFIG_USB_KEYBOARD
net_busy_flag = 0;
#endif
net_set_state(NETLOOP_CONTINUE);
/*
* Start the ball rolling with the given start function. From
* here on, this code is a state machine driven by received
* packets and timer events.
*/
debug_cond(DEBUG_INT_STATE, "--- NetLoop Init\n");
NetInitLoop();
switch (net_check_prereq(protocol)) {
case 1:
/* network not configured */
eth_halt();
return -ENODEV;
case 2:
/* network device not configured */
break;
case 0:
NetDevExists = 1;
NetBootFileXferSize = 0;
switch (protocol) {
case TFTPGET:
#ifdef CONFIG_CMD_TFTPPUT
case TFTPPUT:
#endif
/* always use ARP to get server ethernet address */
TftpStart(protocol);
break;
#ifdef CONFIG_CMD_TFTPSRV
case TFTPSRV:
TftpStartServer();
break;
#endif
#if defined(CONFIG_CMD_DHCP)
case DHCP:
BootpReset();
NetOurIP = 0;
DhcpRequest(); /* Basically same as BOOTP */
break;
#endif
case BOOTP:
BootpReset();
NetOurIP = 0;
BootpRequest();
break;
#if defined(CONFIG_CMD_RARP)
case RARP:
RarpTry = 0;
NetOurIP = 0;
RarpRequest();
break;
#endif
#if defined(CONFIG_CMD_PING)
case PING:
ping_start();
break;
#endif
#if defined(CONFIG_CMD_NFS)
case NFS:
NfsStart();
break;
#endif
#if defined(CONFIG_CMD_CDP)
case CDP:
CDPStart();
break;
#endif
#if defined (CONFIG_NETCONSOLE) && !(CONFIG_SPL_BUILD)
case NETCONS:
NcStart();
break;
#endif
#if defined(CONFIG_CMD_SNTP)
case SNTP:
SntpStart();
break;
#endif
#if defined(CONFIG_CMD_DNS)
case DNS:
DnsStart();
break;
#endif
#if defined(CONFIG_CMD_LINK_LOCAL)
case LINKLOCAL:
link_local_start();
break;
#endif
default:
break;
}
break;
}
#if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
#if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \
defined(CONFIG_STATUS_LED) && \
defined(STATUS_LED_RED)
/*
* Echo the inverted link state to the fault LED.
*/
if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR))
status_led_set(STATUS_LED_RED, STATUS_LED_OFF);
else
status_led_set(STATUS_LED_RED, STATUS_LED_ON);
#endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
#endif /* CONFIG_MII, ... */
#ifdef CONFIG_USB_KEYBOARD
net_busy_flag = 1;
#endif
/*
* Main packet reception loop. Loop receiving packets until
* someone sets `net_state' to a state that terminates.
*/
for (;;) {
WATCHDOG_RESET();
#ifdef CONFIG_SHOW_ACTIVITY
show_activity(1);
#endif
/*
* Check the ethernet for a new packet. The ethernet
* receive routine will process it.
* Most drivers return the most recent packet size, but not
* errors that may have happened.
*/
eth_rx();
/*
* Abort if ctrl-c was pressed.
*/
if (ctrlc()) {
/* cancel any ARP that may not have completed */
NetArpWaitPacketIP = 0;
net_cleanup_loop();
eth_halt();
/* Invalidate the last protocol */
eth_set_last_protocol(BOOTP);
puts("\nAbort\n");
/* include a debug print as well incase the debug
messages are directed to stderr */
debug_cond(DEBUG_INT_STATE, "--- NetLoop Abort!\n");
goto done;
}
ArpTimeoutCheck();
/*
* Check for a timeout, and run the timeout handler
* if we have one.
*/
if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) {
thand_f *x;
#if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
#if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \
defined(CONFIG_STATUS_LED) && \
defined(STATUS_LED_RED)
/*
* Echo the inverted link state to the fault LED.
*/
if (miiphy_link(eth_get_dev()->name,
CONFIG_SYS_FAULT_MII_ADDR)) {
status_led_set(STATUS_LED_RED, STATUS_LED_OFF);
} else {
status_led_set(STATUS_LED_RED, STATUS_LED_ON);
}
#endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
#endif /* CONFIG_MII, ... */
debug_cond(DEBUG_INT_STATE, "--- NetLoop timeout\n");
x = timeHandler;
timeHandler = (thand_f *)0;
(*x)();
}
if (net_state == NETLOOP_FAIL)
ret = NetStartAgain();
switch (net_state) {
case NETLOOP_RESTART:
NetRestarted = 1;
goto restart;
case NETLOOP_SUCCESS:
net_cleanup_loop();
if (NetBootFileXferSize > 0) {
printf("Bytes transferred = %ld (%lx hex)\n",
NetBootFileXferSize,
NetBootFileXferSize);
setenv_hex("filesize", NetBootFileXferSize);
setenv_hex("fileaddr", load_addr);
}
if (protocol != NETCONS)
eth_halt();
else
eth_halt_state_only();
eth_set_last_protocol(protocol);
ret = NetBootFileXferSize;
debug_cond(DEBUG_INT_STATE, "--- NetLoop Success!\n");
goto done;
case NETLOOP_FAIL:
net_cleanup_loop();
/* Invalidate the last protocol */
eth_set_last_protocol(BOOTP);
debug_cond(DEBUG_INT_STATE, "--- NetLoop Fail!\n");
goto done;
case NETLOOP_CONTINUE:
continue;
}
}
done:
#ifdef CONFIG_USB_KEYBOARD
net_busy_flag = 0;
#endif
#ifdef CONFIG_CMD_TFTPPUT
/* Clear out the handlers */
net_set_udp_handler(NULL);
net_set_icmp_handler(NULL);
#endif
return ret;
}
/**********************************************************************/
static void
startAgainTimeout(void)
{
net_set_state(NETLOOP_RESTART);
}
int NetStartAgain(void)
{
char *nretry;
int retry_forever = 0;
unsigned long retrycnt = 0;
int ret;
nretry = getenv("netretry");
if (nretry) {
if (!strcmp(nretry, "yes"))
retry_forever = 1;
else if (!strcmp(nretry, "no"))
retrycnt = 0;
else if (!strcmp(nretry, "once"))
retrycnt = 1;
else
retrycnt = simple_strtoul(nretry, NULL, 0);
} else {
retrycnt = 0;
retry_forever = 0;
}
if ((!retry_forever) && (NetTryCount >= retrycnt)) {
eth_halt();
net_set_state(NETLOOP_FAIL);
/*
* We don't provide a way for the protocol to return an error,
* but this is almost always the reason.
*/
return -ETIMEDOUT;
}
NetTryCount++;
eth_halt();
#if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
eth_try_another(!NetRestarted);
#endif
ret = eth_init();
if (NetRestartWrap) {
NetRestartWrap = 0;
if (NetDevExists) {
NetSetTimeout(10000UL, startAgainTimeout);
net_set_udp_handler(NULL);
} else {
net_set_state(NETLOOP_FAIL);
}
} else {
net_set_state(NETLOOP_RESTART);
}
return ret;
}
/**********************************************************************/
/*
* Miscelaneous bits.
*/
static void dummy_handler(uchar *pkt, unsigned dport,
IPaddr_t sip, unsigned sport,
unsigned len)
{
}
rxhand_f *net_get_udp_handler(void)
{
return udp_packet_handler;
}
void net_set_udp_handler(rxhand_f *f)
{
debug_cond(DEBUG_INT_STATE, "--- NetLoop UDP handler set (%p)\n", f);
if (f == NULL)
udp_packet_handler = dummy_handler;
else
udp_packet_handler = f;
}
rxhand_f *net_get_arp_handler(void)
{
return arp_packet_handler;
}
void net_set_arp_handler(rxhand_f *f)
{
debug_cond(DEBUG_INT_STATE, "--- NetLoop ARP handler set (%p)\n", f);
if (f == NULL)
arp_packet_handler = dummy_handler;
else
arp_packet_handler = f;
}
#ifdef CONFIG_CMD_TFTPPUT
void net_set_icmp_handler(rxhand_icmp_f *f)
{
packet_icmp_handler = f;
}
#endif
void
NetSetTimeout(ulong iv, thand_f *f)
{
if (iv == 0) {
debug_cond(DEBUG_INT_STATE,
"--- NetLoop timeout handler cancelled\n");
timeHandler = (thand_f *)0;
} else {
debug_cond(DEBUG_INT_STATE,
"--- NetLoop timeout handler set (%p)\n", f);
timeHandler = f;
timeStart = get_timer(0);
timeDelta = iv * CONFIG_SYS_HZ / 1000;
}
}
int NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport,
int payload_len)
{
uchar *pkt;
int eth_hdr_size;
int pkt_hdr_size;
/* make sure the NetTxPacket is initialized (NetInit() was called) */
assert(NetTxPacket != NULL);
if (NetTxPacket == NULL)
return -1;
/* convert to new style broadcast */
if (dest == 0)
dest = 0xFFFFFFFF;
/* if broadcast, make the ether address a broadcast and don't do ARP */
if (dest == 0xFFFFFFFF)
ether = NetBcastAddr;
pkt = (uchar *)NetTxPacket;
eth_hdr_size = NetSetEther(pkt, ether, PROT_IP);
pkt += eth_hdr_size;
net_set_udp_header(pkt, dest, dport, sport, payload_len);
pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE;
/* if MAC address was not discovered yet, do an ARP request */
if (memcmp(ether, NetEtherNullAddr, 6) == 0) {
debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &dest);
/* save the ip and eth addr for the packet to send after arp */
NetArpWaitPacketIP = dest;
NetArpWaitPacketMAC = ether;
/* size of the waiting packet */
NetArpWaitTxPacketSize = pkt_hdr_size + payload_len;
/* and do the ARP request */
NetArpWaitTry = 1;
NetArpWaitTimerStart = get_timer(0);
ArpRequest();
return 1; /* waiting */
} else {
debug_cond(DEBUG_DEV_PKT, "sending UDP to %pI4/%pM\n",
&dest, ether);
NetSendPacket(NetTxPacket, pkt_hdr_size + payload_len);
return 0; /* transmitted */
}
}
#ifdef CONFIG_IP_DEFRAG
/*
* This function collects fragments in a single packet, according
* to the algorithm in RFC815. It returns NULL or the pointer to
* a complete packet, in static storage
*/
#ifndef CONFIG_NET_MAXDEFRAG
#define CONFIG_NET_MAXDEFRAG 16384
#endif
/*
* MAXDEFRAG, above, is chosen in the config file and is real data
* so we need to add the NFS overhead, which is more than TFTP.
* To use sizeof in the internal unnamed structures, we need a real
* instance (can't do "sizeof(struct rpc_t.u.reply))", unfortunately).
* The compiler doesn't complain nor allocates the actual structure
*/
static struct rpc_t rpc_specimen;
#define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG + sizeof(rpc_specimen.u.reply))
#define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE)
/*
* this is the packet being assembled, either data or frag control.
* Fragments go by 8 bytes, so this union must be 8 bytes long
*/
struct hole {
/* first_byte is address of this structure */
u16 last_byte; /* last byte in this hole + 1 (begin of next hole) */
u16 next_hole; /* index of next (in 8-b blocks), 0 == none */
u16 prev_hole; /* index of prev, 0 == none */
u16 unused;
};
static struct ip_udp_hdr *__NetDefragment(struct ip_udp_hdr *ip, int *lenp)
{
static uchar pkt_buff[IP_PKTSIZE] __aligned(PKTALIGN);
static u16 first_hole, total_len;
struct hole *payload, *thisfrag, *h, *newh;
struct ip_udp_hdr *localip = (struct ip_udp_hdr *)pkt_buff;
uchar *indata = (uchar *)ip;
int offset8, start, len, done = 0;
u16 ip_off = ntohs(ip->ip_off);
/* payload starts after IP header, this fragment is in there */
payload = (struct hole *)(pkt_buff + IP_HDR_SIZE);
offset8 = (ip_off & IP_OFFS);
thisfrag = payload + offset8;
start = offset8 * 8;
len = ntohs(ip->ip_len) - IP_HDR_SIZE;
if (start + len > IP_MAXUDP) /* fragment extends too far */
return NULL;
if (!total_len || localip->ip_id != ip->ip_id) {
/* new (or different) packet, reset structs */
total_len = 0xffff;
payload[0].last_byte = ~0;
payload[0].next_hole = 0;
payload[0].prev_hole = 0;
first_hole = 0;
/* any IP header will work, copy the first we received */
memcpy(localip, ip, IP_HDR_SIZE);
}
/*
* What follows is the reassembly algorithm. We use the payload
* array as a linked list of hole descriptors, as each hole starts
* at a multiple of 8 bytes. However, last byte can be whatever value,
* so it is represented as byte count, not as 8-byte blocks.
*/
h = payload + first_hole;
while (h->last_byte < start) {
if (!h->next_hole) {
/* no hole that far away */
return NULL;
}
h = payload + h->next_hole;
}
/* last fragment may be 1..7 bytes, the "+7" forces acceptance */
if (offset8 + ((len + 7) / 8) <= h - payload) {
/* no overlap with holes (dup fragment?) */
return NULL;
}
if (!(ip_off & IP_FLAGS_MFRAG)) {
/* no more fragmentss: truncate this (last) hole */
total_len = start + len;
h->last_byte = start + len;
}
/*
* There is some overlap: fix the hole list. This code doesn't
* deal with a fragment that overlaps with two different holes
* (thus being a superset of a previously-received fragment).
*/
if ((h >= thisfrag) && (h->last_byte <= start + len)) {
/* complete overlap with hole: remove hole */
if (!h->prev_hole && !h->next_hole) {
/* last remaining hole */
done = 1;
} else if (!h->prev_hole) {
/* first hole */
first_hole = h->next_hole;
payload[h->next_hole].prev_hole = 0;
} else if (!h->next_hole) {
/* last hole */
payload[h->prev_hole].next_hole = 0;
} else {
/* in the middle of the list */
payload[h->next_hole].prev_hole = h->prev_hole;
payload[h->prev_hole].next_hole = h->next_hole;
}
} else if (h->last_byte <= start + len) {
/* overlaps with final part of the hole: shorten this hole */
h->last_byte = start;
} else if (h >= thisfrag) {
/* overlaps with initial part of the hole: move this hole */
newh = thisfrag + (len / 8);
*newh = *h;
h = newh;
if (h->next_hole)
payload[h->next_hole].prev_hole = (h - payload);
if (h->prev_hole)
payload[h->prev_hole].next_hole = (h - payload);
else
first_hole = (h - payload);
} else {
/* fragment sits in the middle: split the hole */
newh = thisfrag + (len / 8);
*newh = *h;
h->last_byte = start;
h->next_hole = (newh - payload);
newh->prev_hole = (h - payload);
if (newh->next_hole)
payload[newh->next_hole].prev_hole = (newh - payload);
}
/* finally copy this fragment and possibly return whole packet */
memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE, len);
if (!done)
return NULL;
localip->ip_len = htons(total_len);
*lenp = total_len + IP_HDR_SIZE;
return localip;
}
static inline struct ip_udp_hdr *NetDefragment(struct ip_udp_hdr *ip, int *lenp)
{
u16 ip_off = ntohs(ip->ip_off);
if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
return ip; /* not a fragment */
return __NetDefragment(ip, lenp);
}
#else /* !CONFIG_IP_DEFRAG */
static inline struct ip_udp_hdr *NetDefragment(struct ip_udp_hdr *ip, int *lenp)
{
u16 ip_off = ntohs(ip->ip_off);
if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
return ip; /* not a fragment */
return NULL;
}
#endif
/**
* Receive an ICMP packet. We deal with REDIRECT and PING here, and silently
* drop others.
*
* @parma ip IP packet containing the ICMP
*/
static void receive_icmp(struct ip_udp_hdr *ip, int len,
IPaddr_t src_ip, struct ethernet_hdr *et)
{
struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src;
switch (icmph->type) {
case ICMP_REDIRECT:
if (icmph->code != ICMP_REDIR_HOST)
return;
printf(" ICMP Host Redirect to %pI4 ",
&icmph->un.gateway);
break;
default:
#if defined(CONFIG_CMD_PING)
ping_receive(et, ip, len);
#endif
#ifdef CONFIG_CMD_TFTPPUT
if (packet_icmp_handler)
packet_icmp_handler(icmph->type, icmph->code,
ntohs(ip->udp_dst), src_ip, ntohs(ip->udp_src),
icmph->un.data, ntohs(ip->udp_len));
#endif
break;
}
}
void net_process_received_packet(uchar *in_packet, int len)
{
struct ethernet_hdr *et;
struct ip_udp_hdr *ip;
IPaddr_t dst_ip;
IPaddr_t src_ip;
int eth_proto;
#if defined(CONFIG_CMD_CDP)
int iscdp;
#endif
ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
debug_cond(DEBUG_NET_PKT, "packet received\n");
NetRxPacket = in_packet;
NetRxPacketLen = len;
et = (struct ethernet_hdr *)in_packet;
/* too small packet? */
if (len < ETHER_HDR_SIZE)
return;
#ifdef CONFIG_API
if (push_packet) {
(*push_packet)(in_packet, len);
return;
}
#endif
#if defined(CONFIG_CMD_CDP)
/* keep track if packet is CDP */
iscdp = is_cdp_packet(et->et_dest);
#endif
myvlanid = ntohs(NetOurVLAN);
if (myvlanid == (ushort)-1)
myvlanid = VLAN_NONE;
mynvlanid = ntohs(NetOurNativeVLAN);
if (mynvlanid == (ushort)-1)
mynvlanid = VLAN_NONE;
eth_proto = ntohs(et->et_protlen);
if (eth_proto < 1514) {
struct e802_hdr *et802 = (struct e802_hdr *)et;
/*
* Got a 802.2 packet. Check the other protocol field.
* XXX VLAN over 802.2+SNAP not implemented!
*/
eth_proto = ntohs(et802->et_prot);
ip = (struct ip_udp_hdr *)(in_packet + E802_HDR_SIZE);
len -= E802_HDR_SIZE;
} else if (eth_proto != PROT_VLAN) { /* normal packet */
ip = (struct ip_udp_hdr *)(in_packet + ETHER_HDR_SIZE);
len -= ETHER_HDR_SIZE;
} else { /* VLAN packet */
struct vlan_ethernet_hdr *vet =
(struct vlan_ethernet_hdr *)et;
debug_cond(DEBUG_NET_PKT, "VLAN packet received\n");
/* too small packet? */
if (len < VLAN_ETHER_HDR_SIZE)
return;
/* if no VLAN active */
if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE
#if defined(CONFIG_CMD_CDP)
&& iscdp == 0
#endif
)
return;
cti = ntohs(vet->vet_tag);
vlanid = cti & VLAN_IDMASK;
eth_proto = ntohs(vet->vet_type);
ip = (struct ip_udp_hdr *)(in_packet + VLAN_ETHER_HDR_SIZE);
len -= VLAN_ETHER_HDR_SIZE;
}
debug_cond(DEBUG_NET_PKT, "Receive from protocol 0x%x\n", eth_proto);
#if defined(CONFIG_CMD_CDP)
if (iscdp) {
cdp_receive((uchar *)ip, len);
return;
}
#endif
if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
if (vlanid == VLAN_NONE)
vlanid = (mynvlanid & VLAN_IDMASK);
/* not matched? */
if (vlanid != (myvlanid & VLAN_IDMASK))
return;
}
switch (eth_proto) {
case PROT_ARP:
ArpReceive(et, ip, len);
break;
#ifdef CONFIG_CMD_RARP
case PROT_RARP:
rarp_receive(ip, len);
break;
#endif
case PROT_IP:
debug_cond(DEBUG_NET_PKT, "Got IP\n");
/* Before we start poking the header, make sure it is there */
if (len < IP_UDP_HDR_SIZE) {
debug("len bad %d < %lu\n", len,
(ulong)IP_UDP_HDR_SIZE);
return;
}
/* Check the packet length */
if (len < ntohs(ip->ip_len)) {
debug("len bad %d < %d\n", len, ntohs(ip->ip_len));
return;
}
len = ntohs(ip->ip_len);
debug_cond(DEBUG_NET_PKT, "len=%d, v=%02x\n",
len, ip->ip_hl_v & 0xff);
/* Can't deal with anything except IPv4 */
if ((ip->ip_hl_v & 0xf0) != 0x40)
return;
/* Can't deal with IP options (headers != 20 bytes) */
if ((ip->ip_hl_v & 0x0f) > 0x05)
return;
/* Check the Checksum of the header */
if (!ip_checksum_ok((uchar *)ip, IP_HDR_SIZE)) {
debug("checksum bad\n");
return;
}
/* If it is not for us, ignore it */
dst_ip = NetReadIP(&ip->ip_dst);
if (NetOurIP && dst_ip != NetOurIP && dst_ip != 0xFFFFFFFF) {
#ifdef CONFIG_MCAST_TFTP
if (Mcast_addr != dst_ip)
#endif
return;
}
/* Read source IP address for later use */
src_ip = NetReadIP(&ip->ip_src);
/*
* The function returns the unchanged packet if it's not
* a fragment, and either the complete packet or NULL if
* it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL)
*/
ip = NetDefragment(ip, &len);
if (!ip)
return;
/*
* watch for ICMP host redirects
*
* There is no real handler code (yet). We just watch
* for ICMP host redirect messages. In case anybody
* sees these messages: please contact me
* (wd@denx.de), or - even better - send me the
* necessary fixes :-)
*
* Note: in all cases where I have seen this so far
* it was a problem with the router configuration,
* for instance when a router was configured in the
* BOOTP reply, but the TFTP server was on the same
* subnet. So this is probably a warning that your
* configuration might be wrong. But I'm not really
* sure if there aren't any other situations.
*
* Simon Glass <sjg@chromium.org>: We get an ICMP when
* we send a tftp packet to a dead connection, or when
* there is no server at the other end.
*/
if (ip->ip_p == IPPROTO_ICMP) {
receive_icmp(ip, len, src_ip, et);
return;
} else if (ip->ip_p != IPPROTO_UDP) { /* Only UDP packets */
return;
}
debug_cond(DEBUG_DEV_PKT,
"received UDP (to=%pI4, from=%pI4, len=%d)\n",
&dst_ip, &src_ip, len);
#ifdef CONFIG_UDP_CHECKSUM
if (ip->udp_xsum != 0) {
ulong xsum;
ushort *sumptr;
ushort sumlen;
xsum = ip->ip_p;
xsum += (ntohs(ip->udp_len));
xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff;
xsum += (ntohl(ip->ip_src) >> 0) & 0x0000ffff;
xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff;
xsum += (ntohl(ip->ip_dst) >> 0) & 0x0000ffff;
sumlen = ntohs(ip->udp_len);
sumptr = (ushort *) &(ip->udp_src);
while (sumlen > 1) {
ushort sumdata;
sumdata = *sumptr++;
xsum += ntohs(sumdata);
sumlen -= 2;
}
if (sumlen > 0) {
ushort sumdata;
sumdata = *(unsigned char *) sumptr;
sumdata = (sumdata << 8) & 0xff00;
xsum += sumdata;
}
while ((xsum >> 16) != 0) {
xsum = (xsum & 0x0000ffff) +
((xsum >> 16) & 0x0000ffff);
}
if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
printf(" UDP wrong checksum %08lx %08x\n",
xsum, ntohs(ip->udp_xsum));
return;
}
}
#endif
#if defined (CONFIG_NETCONSOLE) && !(CONFIG_SPL_BUILD)
nc_input_packet((uchar *)ip + IP_UDP_HDR_SIZE,
src_ip,
ntohs(ip->udp_dst),
ntohs(ip->udp_src),
ntohs(ip->udp_len) - UDP_HDR_SIZE);
#endif
/*
* IP header OK. Pass the packet to the current handler.
*/
(*udp_packet_handler)((uchar *)ip + IP_UDP_HDR_SIZE,
ntohs(ip->udp_dst),
src_ip,
ntohs(ip->udp_src),
ntohs(ip->udp_len) - UDP_HDR_SIZE);
break;
}
}
/**********************************************************************/
static int net_check_prereq(enum proto_t protocol)
{
switch (protocol) {
/* Fall through */
#if defined(CONFIG_CMD_PING)
case PING:
if (NetPingIP == 0) {
puts("*** ERROR: ping address not given\n");
return 1;
}
goto common;
#endif
#if defined(CONFIG_CMD_SNTP)
case SNTP:
if (NetNtpServerIP == 0) {
puts("*** ERROR: NTP server address not given\n");
return 1;
}
goto common;
#endif
#if defined(CONFIG_CMD_DNS)
case DNS:
if (NetOurDNSIP == 0) {
puts("*** ERROR: DNS server address not given\n");
return 1;
}
goto common;
#endif
#if defined(CONFIG_CMD_NFS)
case NFS:
#endif
case TFTPGET:
case TFTPPUT:
if (NetServerIP == 0) {
puts("*** ERROR: `serverip' not set\n");
return 1;
}
#if defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \
defined(CONFIG_CMD_DNS)
common:
#endif
/* Fall through */
case NETCONS:
case TFTPSRV:
if (NetOurIP == 0) {
puts("*** ERROR: `ipaddr' not set\n");
return 1;
}
/* Fall through */
#ifdef CONFIG_CMD_RARP
case RARP:
#endif
case BOOTP:
case CDP:
case DHCP:
case LINKLOCAL:
if (memcmp(NetOurEther, "\0\0\0\0\0\0", 6) == 0) {
int num = eth_get_dev_index();
switch (num) {
case -1:
puts("*** ERROR: No ethernet found.\n");
return 1;
case 0:
puts("*** ERROR: `ethaddr' not set\n");
break;
default:
printf("*** ERROR: `eth%daddr' not set\n",
num);
break;
}
NetStartAgain();
return 2;
}
/* Fall through */
default:
return 0;
}
return 0; /* OK */
}
/**********************************************************************/
int
NetEthHdrSize(void)
{
ushort myvlanid;
myvlanid = ntohs(NetOurVLAN);
if (myvlanid == (ushort)-1)
myvlanid = VLAN_NONE;
return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE :
VLAN_ETHER_HDR_SIZE;
}
int
NetSetEther(uchar *xet, uchar * addr, uint prot)
{
struct ethernet_hdr *et = (struct ethernet_hdr *)xet;
ushort myvlanid;
myvlanid = ntohs(NetOurVLAN);
if (myvlanid == (ushort)-1)
myvlanid = VLAN_NONE;
memcpy(et->et_dest, addr, 6);
memcpy(et->et_src, NetOurEther, 6);
if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
et->et_protlen = htons(prot);
return ETHER_HDR_SIZE;
} else {
struct vlan_ethernet_hdr *vet =
(struct vlan_ethernet_hdr *)xet;
vet->vet_vlan_type = htons(PROT_VLAN);
vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
vet->vet_type = htons(prot);
return VLAN_ETHER_HDR_SIZE;
}
}
int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot)
{
ushort protlen;
memcpy(et->et_dest, addr, 6);
memcpy(et->et_src, NetOurEther, 6);
protlen = ntohs(et->et_protlen);
if (protlen == PROT_VLAN) {
struct vlan_ethernet_hdr *vet =
(struct vlan_ethernet_hdr *)et;
vet->vet_type = htons(prot);
return VLAN_ETHER_HDR_SIZE;
} else if (protlen > 1514) {
et->et_protlen = htons(prot);
return ETHER_HDR_SIZE;
} else {
/* 802.2 + SNAP */
struct e802_hdr *et802 = (struct e802_hdr *)et;
et802->et_prot = htons(prot);
return E802_HDR_SIZE;
}
}
void net_set_ip_header(uchar *pkt, IPaddr_t dest, IPaddr_t source)
{
struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
/*
* Construct an IP header.
*/
/* IP_HDR_SIZE / 4 (not including UDP) */
ip->ip_hl_v = 0x45;
ip->ip_tos = 0;
ip->ip_len = htons(IP_HDR_SIZE);
ip->ip_id = htons(NetIPID++);
ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */
ip->ip_ttl = 255;
ip->ip_sum = 0;
/* already in network byte order */
NetCopyIP((void *)&ip->ip_src, &source);
/* already in network byte order */
NetCopyIP((void *)&ip->ip_dst, &dest);
}
void net_set_udp_header(uchar *pkt, IPaddr_t dest, int dport, int sport,
int len)
{
struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
/*
* If the data is an odd number of bytes, zero the
* byte after the last byte so that the checksum
* will work.
*/
if (len & 1)
pkt[IP_UDP_HDR_SIZE + len] = 0;
net_set_ip_header(pkt, dest, NetOurIP);
ip->ip_len = htons(IP_UDP_HDR_SIZE + len);
ip->ip_p = IPPROTO_UDP;
ip->ip_sum = compute_ip_checksum(ip, IP_HDR_SIZE);
ip->udp_src = htons(sport);
ip->udp_dst = htons(dport);
ip->udp_len = htons(UDP_HDR_SIZE + len);
ip->udp_xsum = 0;
}
void copy_filename(char *dst, const char *src, int size)
{
if (*src && (*src == '"')) {
++src;
--size;
}
while ((--size > 0) && *src && (*src != '"'))
*dst++ = *src++;
*dst = '\0';
}
#if defined(CONFIG_CMD_NFS) || \
defined(CONFIG_CMD_SNTP) || \
defined(CONFIG_CMD_DNS)
/*
* make port a little random (1024-17407)
* This keeps the math somewhat trivial to compute, and seems to work with
* all supported protocols/clients/servers
*/
unsigned int random_port(void)
{
return 1024 + (get_timer(0) % 0x4000);
}
#endif
void ip_to_string(IPaddr_t x, char *s)
{
x = ntohl(x);
sprintf(s, "%d.%d.%d.%d",
(int) ((x >> 24) & 0xff),
(int) ((x >> 16) & 0xff),
(int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff)
);
}
void VLAN_to_string(ushort x, char *s)
{
x = ntohs(x);
if (x == (ushort)-1)
x = VLAN_NONE;
if (x == VLAN_NONE)
strcpy(s, "none");
else
sprintf(s, "%d", x & VLAN_IDMASK);
}
ushort string_to_VLAN(const char *s)
{
ushort id;
if (s == NULL)
return htons(VLAN_NONE);
if (*s < '0' || *s > '9')
id = VLAN_NONE;
else
id = (ushort)simple_strtoul(s, NULL, 10);
return htons(id);
}
ushort getenv_VLAN(char *var)
{
return string_to_VLAN(getenv(var));
}