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net.c
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// SPDX-License-Identifier: GPL-2.0
/*
* 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, [email protected]
*/
/*
* 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
*
*
* WOL:
*
* Prerequisites: - own ethernet address
* We want: - magic packet or timeout
* Next step: none
*/
#include <common.h>
#include <bootstage.h>
#include <command.h>
#include <console.h>
#include <env.h>
#include <env_internal.h>
#include <errno.h>
#include <image.h>
#include <log.h>
#include <net.h>
#include <net/fastboot.h>
#include <net/tftp.h>
#include <net/ncsi.h>
#if defined(CONFIG_CMD_PCAP)
#include <net/pcap.h>
#endif
#include <net/udp.h>
#if defined(CONFIG_LED_STATUS)
#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_WOL)
#include "wol.h"
#endif
/** BOOTP EXTENTIONS **/
/* Our subnet mask (0=unknown) */
struct in_addr net_netmask;
/* Our gateways IP address */
struct in_addr net_gateway;
/* Our DNS IP address */
struct in_addr net_dns_server;
#if defined(CONFIG_BOOTP_DNS2)
/* Our 2nd DNS IP address */
struct in_addr net_dns_server2;
#endif
/** END OF BOOTP EXTENTIONS **/
/* Our ethernet address */
u8 net_ethaddr[6];
/* Boot server enet address */
u8 net_server_ethaddr[6];
/* Our IP addr (0 = unknown) */
struct in_addr net_ip;
/* Server IP addr (0 = unknown) */
struct in_addr net_server_ip;
/* Current receive packet */
uchar *net_rx_packet;
/* Current rx packet length */
int net_rx_packet_len;
/* IP packet ID */
static unsigned net_ip_id;
/* Ethernet bcast address */
const u8 net_bcast_ethaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
const u8 net_null_ethaddr[6];
#if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER)
void (*push_packet)(void *, int len) = 0;
#endif
/* Network loop state */
enum net_loop_state net_state;
/* Tried all network devices */
int net_restart_wrap;
/* Network loop restarted */
static int net_restarted;
/* At least one device configured */
static int net_dev_exists;
/* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
/* default is without VLAN */
ushort net_our_vlan = 0xFFFF;
/* ditto */
ushort net_native_vlan = 0xFFFF;
/* Boot File name */
char net_boot_file_name[1024];
/* Indicates whether the file name was specified on the command line */
bool net_boot_file_name_explicit;
/* The actual transferred size of the bootfile (in bytes) */
u32 net_boot_file_size;
/* Boot file size in blocks as reported by the DHCP server */
u32 net_boot_file_expected_size_in_blocks;
static uchar net_pkt_buf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
/* Receive packets */
uchar *net_rx_packets[PKTBUFSRX];
/* 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 *time_handler;
/* Time base value */
static ulong time_start;
/* Current timeout value */
static ulong time_delta;
/* THE transmit packet */
uchar *net_tx_packet;
static int net_check_prereq(enum proto_t protocol);
static int net_try_count;
int __maybe_unused net_busy_flag;
/**********************************************************************/
static int on_ipaddr(const char *name, const char *value, enum env_op op,
int flags)
{
if (flags & H_PROGRAMMATIC)
return 0;
net_ip = string_to_ip(value);
return 0;
}
U_BOOT_ENV_CALLBACK(ipaddr, on_ipaddr);
static int on_gatewayip(const char *name, const char *value, enum env_op op,
int flags)
{
if (flags & H_PROGRAMMATIC)
return 0;
net_gateway = string_to_ip(value);
return 0;
}
U_BOOT_ENV_CALLBACK(gatewayip, on_gatewayip);
static int on_netmask(const char *name, const char *value, enum env_op op,
int flags)
{
if (flags & H_PROGRAMMATIC)
return 0;
net_netmask = string_to_ip(value);
return 0;
}
U_BOOT_ENV_CALLBACK(netmask, on_netmask);
static int on_serverip(const char *name, const char *value, enum env_op op,
int flags)
{
if (flags & H_PROGRAMMATIC)
return 0;
net_server_ip = string_to_ip(value);
return 0;
}
U_BOOT_ENV_CALLBACK(serverip, on_serverip);
static int on_nvlan(const char *name, const char *value, enum env_op op,
int flags)
{
if (flags & H_PROGRAMMATIC)
return 0;
net_native_vlan = string_to_vlan(value);
return 0;
}
U_BOOT_ENV_CALLBACK(nvlan, on_nvlan);
static int on_vlan(const char *name, const char *value, enum env_op op,
int flags)
{
if (flags & H_PROGRAMMATIC)
return 0;
net_our_vlan = string_to_vlan(value);
return 0;
}
U_BOOT_ENV_CALLBACK(vlan, on_vlan);
#if defined(CONFIG_CMD_DNS)
static int on_dnsip(const char *name, const char *value, enum env_op op,
int flags)
{
if (flags & H_PROGRAMMATIC)
return 0;
net_dns_server = string_to_ip(value);
return 0;
}
U_BOOT_ENV_CALLBACK(dnsip, on_dnsip);
#endif
/*
* 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) && !defined(CONFIG_SPL_BUILD)
const char *s = env_get("autoload");
if (s != NULL && strcmp(s, "NFS") == 0) {
if (net_check_prereq(NFS)) {
/* We aren't expecting to get a serverip, so just accept the assigned IP */
if (IS_ENABLED(CONFIG_BOOTP_SERVERIP)) {
net_set_state(NETLOOP_SUCCESS);
} else {
printf("Cannot autoload with NFS\n");
net_set_state(NETLOOP_FAIL);
}
return;
}
/*
* Use NFS to load the bootfile.
*/
nfs_start();
return;
}
#endif
if (env_get_yesno("autoload") == 0) {
/*
* Just use BOOTP/RARP to configure system;
* Do not use TFTP to load the bootfile.
*/
net_set_state(NETLOOP_SUCCESS);
return;
}
if (net_check_prereq(TFTPGET)) {
/* We aren't expecting to get a serverip, so just accept the assigned IP */
if (IS_ENABLED(CONFIG_BOOTP_SERVERIP)) {
net_set_state(NETLOOP_SUCCESS);
} else {
printf("Cannot autoload with TFTPGET\n");
net_set_state(NETLOOP_FAIL);
}
return;
}
tftp_start(TFTPGET);
}
static int net_init_loop(void)
{
if (eth_get_dev())
memcpy(net_ethaddr, eth_get_ethaddr(), 6);
else
/*
* Not ideal, but there's no way to get the actual error, and I
* don't feel like fixing all the users of eth_get_dev to deal
* with errors.
*/
return -ENONET;
return 0;
}
static void net_clear_handlers(void)
{
net_set_udp_handler(NULL);
net_set_arp_handler(NULL);
net_set_timeout_handler(0, NULL);
}
static void net_cleanup_loop(void)
{
net_clear_handlers();
}
int net_init(void)
{
static int first_call = 1;
if (first_call) {
/*
* Setup packet buffers, aligned correctly.
*/
int i;
net_tx_packet = &net_pkt_buf[0] + (PKTALIGN - 1);
net_tx_packet -= (ulong)net_tx_packet % PKTALIGN;
for (i = 0; i < PKTBUFSRX; i++) {
net_rx_packets[i] = net_tx_packet +
(i + 1) * PKTSIZE_ALIGN;
}
arp_init();
net_clear_handlers();
/* Only need to setup buffer pointers once. */
first_call = 0;
}
return net_init_loop();
}
/**********************************************************************/
/*
* Main network processing loop.
*/
int net_loop(enum proto_t protocol)
{
int ret = -EINVAL;
enum net_loop_state prev_net_state = net_state;
#if defined(CONFIG_CMD_PING)
if (protocol != PING)
net_ping_ip.s_addr = 0;
#endif
net_restarted = 0;
net_dev_exists = 0;
net_try_count = 1;
debug_cond(DEBUG_INT_STATE, "--- net_loop Entry\n");
#ifdef CONFIG_PHY_NCSI
if (phy_interface_is_ncsi() && protocol != NCSI && !ncsi_active()) {
printf("%s: configuring NCSI first\n", __func__);
if (net_loop(NCSI) < 0)
return ret;
eth_init_state_only();
goto restart;
}
#endif
bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start");
net_init();
if (eth_is_on_demand_init()) {
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, "--- net_loop Init\n");
net_init_loop();
switch (net_check_prereq(protocol)) {
case 1:
/* network not configured */
eth_halt();
net_set_state(prev_net_state);
return -ENODEV;
case 2:
/* network device not configured */
break;
case 0:
net_dev_exists = 1;
net_boot_file_size = 0;
switch (protocol) {
#ifdef CONFIG_CMD_TFTPBOOT
case TFTPGET:
#ifdef CONFIG_CMD_TFTPPUT
case TFTPPUT:
#endif
/* always use ARP to get server ethernet address */
tftp_start(protocol);
break;
#endif
#ifdef CONFIG_CMD_TFTPSRV
case TFTPSRV:
tftp_start_server();
break;
#endif
#ifdef CONFIG_UDP_FUNCTION_FASTBOOT
case FASTBOOT:
fastboot_start_server();
break;
#endif
#if defined(CONFIG_CMD_DHCP)
case DHCP:
bootp_reset();
net_ip.s_addr = 0;
dhcp_request(); /* Basically same as BOOTP */
break;
#endif
#if defined(CONFIG_CMD_BOOTP)
case BOOTP:
bootp_reset();
net_ip.s_addr = 0;
bootp_request();
break;
#endif
#if defined(CONFIG_CMD_RARP)
case RARP:
rarp_try = 0;
net_ip.s_addr = 0;
rarp_request();
break;
#endif
#if defined(CONFIG_CMD_PING)
case PING:
ping_start();
break;
#endif
#if defined(CONFIG_CMD_NFS) && !defined(CONFIG_SPL_BUILD)
case NFS:
nfs_start();
break;
#endif
#if defined(CONFIG_CMD_CDP)
case CDP:
cdp_start();
break;
#endif
#if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_SPL_BUILD)
case NETCONS:
nc_start();
break;
#endif
#if defined(CONFIG_CMD_DNS)
case DNS:
dns_start();
break;
#endif
#if defined(CONFIG_CMD_LINK_LOCAL)
case LINKLOCAL:
link_local_start();
break;
#endif
#if defined(CONFIG_CMD_WOL)
case WOL:
wol_start();
break;
#endif
#if defined(CONFIG_PHY_NCSI)
case NCSI:
ncsi_probe_packages();
break;
#endif
default:
break;
}
if (IS_ENABLED(CONFIG_PROT_UDP) && protocol == UDP)
udp_start();
break;
}
#if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
#if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \
defined(CONFIG_LED_STATUS) && \
defined(CONFIG_LED_STATUS_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(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_OFF);
else
status_led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_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 (;;) {
schedule();
if (arp_timeout_check() > 0)
time_start = get_timer(0);
/*
* 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 */
net_arp_wait_packet_ip.s_addr = 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, "--- net_loop Abort!\n");
ret = -EINTR;
goto done;
}
/*
* Check for a timeout, and run the timeout handler
* if we have one.
*/
if (time_handler &&
((get_timer(0) - time_start) > time_delta)) {
thand_f *x;
#if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
#if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \
defined(CONFIG_LED_STATUS) && \
defined(CONFIG_LED_STATUS_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(CONFIG_LED_STATUS_RED,
CONFIG_LED_STATUS_OFF);
else
status_led_set(CONFIG_LED_STATUS_RED,
CONFIG_LED_STATUS_ON);
#endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
#endif /* CONFIG_MII, ... */
debug_cond(DEBUG_INT_STATE, "--- net_loop timeout\n");
x = time_handler;
time_handler = (thand_f *)0;
(*x)();
}
if (net_state == NETLOOP_FAIL)
ret = net_start_again();
switch (net_state) {
case NETLOOP_RESTART:
net_restarted = 1;
goto restart;
case NETLOOP_SUCCESS:
net_cleanup_loop();
if (net_boot_file_size > 0) {
printf("Bytes transferred = %d (%x hex)\n",
net_boot_file_size, net_boot_file_size);
env_set_hex("filesize", net_boot_file_size);
env_set_hex("fileaddr", image_load_addr);
}
if (protocol != NETCONS && protocol != NCSI)
eth_halt();
else
eth_halt_state_only();
eth_set_last_protocol(protocol);
ret = net_boot_file_size;
debug_cond(DEBUG_INT_STATE, "--- net_loop Success!\n");
goto done;
case NETLOOP_FAIL:
net_cleanup_loop();
/* Invalidate the last protocol */
eth_set_last_protocol(BOOTP);
debug_cond(DEBUG_INT_STATE, "--- net_loop Fail!\n");
ret = -ENONET;
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
net_set_state(prev_net_state);
#if defined(CONFIG_CMD_PCAP)
if (pcap_active())
pcap_print_status();
#endif
return ret;
}
/**********************************************************************/
static void start_again_timeout_handler(void)
{
net_set_state(NETLOOP_RESTART);
}
int net_start_again(void)
{
char *nretry;
int retry_forever = 0;
unsigned long retrycnt = 0;
int ret;
nretry = env_get("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) && (net_try_count > 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;
}
net_try_count++;
eth_halt();
#if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
eth_try_another(!net_restarted);
#endif
ret = eth_init();
if (net_restart_wrap) {
net_restart_wrap = 0;
if (net_dev_exists) {
net_set_timeout_handler(10000UL,
start_again_timeout_handler);
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,
struct in_addr 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, "--- net_loop 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, "--- net_loop 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 net_set_timeout_handler(ulong iv, thand_f *f)
{
if (iv == 0) {
debug_cond(DEBUG_INT_STATE,
"--- net_loop timeout handler cancelled\n");
time_handler = (thand_f *)0;
} else {
debug_cond(DEBUG_INT_STATE,
"--- net_loop timeout handler set (%p)\n", f);
time_handler = f;
time_start = get_timer(0);
time_delta = iv * CONFIG_SYS_HZ / 1000;
}
}
uchar *net_get_async_tx_pkt_buf(void)
{
if (arp_is_waiting())
return arp_tx_packet; /* If we are waiting, we already sent */
else
return net_tx_packet;
}
int net_send_udp_packet(uchar *ether, struct in_addr dest, int dport, int sport,
int payload_len)
{
return net_send_ip_packet(ether, dest, dport, sport, payload_len,
IPPROTO_UDP, 0, 0, 0);
}
int net_send_ip_packet(uchar *ether, struct in_addr dest, int dport, int sport,
int payload_len, int proto, u8 action, u32 tcp_seq_num,
u32 tcp_ack_num)
{
uchar *pkt;
int eth_hdr_size;
int pkt_hdr_size;
/* make sure the net_tx_packet is initialized (net_init() was called) */
assert(net_tx_packet != NULL);
if (net_tx_packet == NULL)
return -1;
/* convert to new style broadcast */
if (dest.s_addr == 0)
dest.s_addr = 0xFFFFFFFF;
/* if broadcast, make the ether address a broadcast and don't do ARP */
if (dest.s_addr == 0xFFFFFFFF)
ether = (uchar *)net_bcast_ethaddr;
pkt = (uchar *)net_tx_packet;
eth_hdr_size = net_set_ether(pkt, ether, PROT_IP);
switch (proto) {
case IPPROTO_UDP:
net_set_udp_header(pkt + eth_hdr_size, dest, dport, sport,
payload_len);
pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE;
break;
default:
return -EINVAL;
}
/* if MAC address was not discovered yet, do an ARP request */
if (memcmp(ether, net_null_ethaddr, 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 */
net_arp_wait_packet_ip = dest;
arp_wait_packet_ethaddr = ether;
/* size of the waiting packet */
arp_wait_tx_packet_size = pkt_hdr_size + payload_len;
/* and do the ARP request */
arp_wait_try = 1;
arp_wait_timer_start = get_timer(0);
arp_request();
return 1; /* waiting */
} else {
debug_cond(DEBUG_DEV_PKT, "sending UDP to %pI4/%pM\n",
&dest, ether);
net_send_packet(net_tx_packet, 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
*/
#define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG)
#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 *__net_defragment(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);
if (ip->ip_len < IP_MIN_FRAG_DATAGRAM_SIZE)
return NULL;
/* 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;