* This file is part of the lwIP TCP/IP stack.
*
* Author: Adam Dunkels <adam@sics.se>
+ * Author: H. Peter Anvin <hpa@@zytor.com>
+ * Author: Eric Biederman <ebiederm@xmission.com>
*
*/
#include <syslinux/pxe_api.h>
#include <dprintf.h>
+#if LWIP_AUTOIP
+#error "AUTOIP not supported"
+#endif
+#if ETH_PAD_SIZE
+#error "ETH_PAD_SIZE not supported"
+#endif
+
+/** the time an ARP entry stays valid after its last update,
+ * for ARP_TMR_INTERVAL = 5000, this is
+ * (240 * 5) seconds = 20 minutes.
+ */
+#define UNDIARP_MAXAGE 240
+/** the time an ARP entry stays pending after first request,
+ * for ARP_TMR_INTERVAL = 5000, this is
+ * (2 * 5) seconds = 10 seconds.
+ *
+ * @internal Keep this number at least 2, otherwise it might
+ * run out instantly if the timeout occurs directly after a request.
+ */
+#define UNDIARP_MAXPENDING 2
+
+typedef u8_t hwaddr_t[NETIF_MAX_HWADDR_LEN];
+
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/bpstruct.h"
+#endif
+PACK_STRUCT_BEGIN
+/** the ARP message */
+struct arp_hdr {
+ PACK_STRUCT_FIELD(u16_t hwtype);
+ PACK_STRUCT_FIELD(u16_t proto);
+ PACK_STRUCT_FIELD(u16_t _hwlen_protolen);
+ PACK_STRUCT_FIELD(u16_t opcode);
+} PACK_STRUCT_STRUCT;
+PACK_STRUCT_END
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/epstruct.h"
+#endif
+
+static inline int arp_hdr_len(struct netif *netif)
+{
+ return sizeof(struct arp_hdr) + (netif->hwaddr_len + sizeof(uint32_t))*2;
+}
+
+enum undiarp_state {
+ UNDIARP_STATE_EMPTY = 0,
+ UNDIARP_STATE_PENDING,
+ UNDIARP_STATE_STABLE
+};
+
+struct undiarp_entry {
+#if ARP_QUEUEING
+ /**
+ * Pointer to queue of pending outgoing packets on this ARP entry.
+ */
+ struct etharp_q_entry *q;
+#endif
+ struct ip_addr ipaddr;
+ u8_t hwaddr[NETIF_MAX_HWADDR_LEN];
+ enum undiarp_state state;
+ u8_t ctime;
+ struct netif *netif;
+};
+
#define PKTBUF_SIZE 2048
/* Define those to better describe your network interface. */
#define IFNAME0 'u'
#define IFNAME1 'n'
+static uint16_t undi_hw_type;
static struct netif undi_netif;
+static struct undiarp_entry arp_table[ARP_TABLE_SIZE];
+#if !LWIP_NETIF_HWADDRHINT
+static u8_t undiarp_cached_entry;
+#endif
+
+/**
+ * Try hard to create a new entry - we want the IP address to appear in
+ * the cache (even if this means removing an active entry or so). */
+#define UNDIARP_TRY_HARD 1
+#define UNDIARP_FIND_ONLY 2
+
+
+static inline bool undi_is_ethernet(struct netif *netif)
+{
+ (void)netif;
+ return undi_hw_type == ETHER_TYPE;
+}
/**
* In this function, the hardware should be initialized.
undi_info.BaseIo, undi_info.IntNumber, undi_info.MaxTranUnit,
undi_info.HwType);
+ /* Remember the hardware type for arp */
+ undi_hw_type = undi_info.HwType;
+
/* set MAC hardware address length */
netif->hwaddr_len = undi_info.HwAddrLen;
dprintf("\n");
/* device capabilities */
+ netif->flags = NETIF_FLAG_BROADCAST | NETIF_FLAG_LINK_UP;
/* don't set NETIF_FLAG_ETHARP if this device is not an ethernet one */
- netif->flags = NETIF_FLAG_BROADCAST | NETIF_FLAG_ETHARP | NETIF_FLAG_LINK_UP;
+ if (undi_is_ethernet(netif))
+ netif->flags |= NETIF_FLAG_ETHARP;
/* Install the interrupt vector */
pxe_irq_vector = undi_info.IntNumber;
* to become availale since the stack doesn't retry to send a packet
* dropped because of memory failure (except for the TCP timers).
*/
-
-/*
- * XXX: This assumes an Ethernet media type.
- */
static err_t
-low_level_output(struct netif *netif, struct pbuf *p)
+undi_transmit(struct netif *netif, struct pbuf *pbuf,
+ hwaddr_t *dest, uint16_t undi_protocol)
{
struct pxe_xmit {
t_PXENV_UNDI_TRANSMIT xmit;
t_PXENV_UNDI_TBD tbd;
};
static __lowmem struct pxe_xmit pxe;
+ static __lowmem hwaddr_t low_dest;
static __lowmem char pkt_buf[PKTBUF_SIZE];
- char *r;
- /* struct undiif *undiif = netif->state; */
- struct pbuf *q;
- static char eth_broadcast[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
- (void)netif;
+ /* Drop jumbo frames */
+ if ((pbuf->tot_len > sizeof(pkt_buf)) || (pbuf->tot_len > netif->mtu))
+ return ERR_ARG;
-#if ETH_PAD_SIZE
- pbuf_header(p, -ETH_PAD_SIZE); /* drop the padding word */
+ pbuf_copy_partial( pbuf, pkt_buf, pbuf->tot_len, 0);
+ if (dest)
+ memcpy(low_dest, dest, netif->hwaddr_len);
+
+ do {
+ memset(&pxe, 0, sizeof pxe);
+
+ pxe.xmit.Protocol = undi_protocol;
+ pxe.xmit.XmitFlag = dest? XMT_DESTADDR : XMT_BROADCAST;
+ pxe.xmit.DestAddr = FAR_PTR(&low_dest);
+ pxe.xmit.TBD = FAR_PTR(&pxe.tbd);
+ pxe.tbd.ImmedLength = pbuf->tot_len;
+ pxe.tbd.Xmit = FAR_PTR(pkt_buf);
+
+ pxe_call(PXENV_UNDI_TRANSMIT, &pxe.xmit);
+ } while (pxe.xmit.Status == PXENV_STATUS_OUT_OF_RESOURCES);
+
+ LINK_STATS_INC(link.xmit);
+
+ return ERR_OK;
+}
+
+static err_t
+undi_send_unknown(struct netif *netif, struct pbuf *pbuf)
+{
+ return undi_transmit(netif, pbuf, NULL, P_UNKNOWN);
+}
+
+static err_t
+undi_send_ip(struct netif *netif, struct pbuf *pbuf, hwaddr_t *dst)
+{
+ return undi_transmit(netif, pbuf, dst, P_IP);
+}
+
+static err_t
+undi_send_arp(struct netif *netif, struct pbuf *pbuf, hwaddr_t *dst)
+{
+ return undi_transmit(netif, pbuf, dst, P_ARP);
+}
+
+/**
+ * Send an ARP request packet asking for ipaddr.
+ *
+ * @param netif the lwip network interface on which to send the request
+ * @param ipaddr the IP address for which to ask
+ * @return ERR_OK if the request has been sent
+ * ERR_MEM if the ARP packet couldn't be allocated
+ * any other err_t on failure
+ */
+static err_t
+undiarp_request(struct netif *netif, struct ip_addr *ipaddr)
+{
+ struct pbuf *p;
+ err_t result = ERR_OK;
+ struct arp_hdr *hdr;
+ u8_t *hdr_ptr;
+
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_request: sending ARP request.\n"));
+
+ /* allocate a pbuf for the outgoing ARP request packet */
+ p = pbuf_alloc(PBUF_RAW, arp_hdr_len(netif), PBUF_RAM);
+ /* could allocate a pbuf for an ARP request? */
+ if (p == NULL) {
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
+ ("etharp_raw: could not allocate pbuf for ARP request.\n"));
+ ETHARP_STATS_INC(etharp.memerr);
+ return ERR_MEM;
+ }
+ LWIP_ASSERT("check that first pbuf can hold arp_hdr_len bytesr",
+ (p->len >= arp_hdr_len(netif)));
+
+ hdr = p->payload;
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("undiarp_request: sending raw ARP packet.\n"));
+ hdr->opcode = htons(ARP_REQUEST);
+ hdr->hwtype = htons(undi_hw_type);
+ hdr->proto = htons(ETHTYPE_IP);
+ /* set hwlen and protolen together */
+ hdr->_hwlen_protolen = htons((netif->hwaddr_len << 8) | sizeof(struct ip_addr));
+
+ hdr_ptr = (unsigned char *)(hdr + 1);
+ memcpy(hdr_ptr, netif->hwaddr, netif->hwaddr_len);
+ hdr_ptr += netif->hwaddr_len;
+ memcpy(hdr_ptr, &netif->ip_addr, 4);
+ hdr_ptr += 4;
+ memset(hdr_ptr, 0, netif->hwaddr_len);
+ hdr_ptr += netif->hwaddr_len;
+ memcpy(hdr_ptr, ipaddr, 4);
+
+ /* send ARP query */
+ result = undi_send_arp(netif, p, NULL);
+ ETHARP_STATS_INC(etharp.xmit);
+ /* free ARP query packet */
+ pbuf_free(p);
+ p = NULL;
+ /* could not allocate pbuf for ARP request */
+
+ return result;
+}
+
+#if ARP_QUEUEING
+/**
+ * Free a complete queue of etharp entries
+ *
+ * @param q a qeueue of etharp_q_entry's to free
+ */
+static void
+free_undiarp_q(struct etharp_q_entry *q)
+{
+ struct etharp_q_entry *r;
+ LWIP_ASSERT("q != NULL", q != NULL);
+ LWIP_ASSERT("q->p != NULL", q->p != NULL);
+ while (q) {
+ r = q;
+ q = q->next;
+ LWIP_ASSERT("r->p != NULL", (r->p != NULL));
+ pbuf_free(r->p);
+ memp_free(MEMP_ARP_QUEUE, r);
+ }
+}
#endif
- r = pkt_buf;
- for (q = p; q != NULL; q = q->next) {
- /* Send the data from the pbuf to the interface, one pbuf at a
- time. The size of the data in each pbuf is kept in the ->len
- variable. */
- memcpy(r, q->payload, q->len);
- r += q->len;
+/**
+ * Clears expired entries in the ARP table.
+ *
+ * This function should be called every ETHARP_TMR_INTERVAL microseconds (5 seconds),
+ * in order to expire entries in the ARP table.
+ */
+void
+undiarp_tmr(void)
+{
+ u8_t i;
+
+ LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer\n"));
+ /* remove expired entries from the ARP table */
+ for (i = 0; i < ARP_TABLE_SIZE; ++i) {
+ arp_table[i].ctime++;
+ if (((arp_table[i].state == UNDIARP_STATE_STABLE) &&
+ (arp_table[i].ctime >= UNDIARP_MAXAGE)) ||
+ ((arp_table[i].state == UNDIARP_STATE_PENDING) &&
+ (arp_table[i].ctime >= UNDIARP_MAXPENDING))) {
+ /* pending or stable entry has become old! */
+ LWIP_DEBUGF(UNDIARP_DEBUG, ("etharp_timer: expired %s entry %"U16_F".\n",
+ arp_table[i].state == UNDIARP_STATE_STABLE ? "stable" : "pending", (u16_t)i));
+ /* clean up entries that have just been expired */
+ /* remove from SNMP ARP index tree */
+ snmp_delete_arpidx_tree(arp_table[i].netif, &arp_table[i].ipaddr);
+#if ARP_QUEUEING
+ /* and empty packet queue */
+ if (arp_table[i].q != NULL) {
+ /* remove all queued packets */
+ LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: freeing entry %"U16_F", packet queue %p.\n", (u16_t)i, (void *)(arp_table[i].q)));
+ free_undiarp_q(arp_table[i].q);
+ arp_table[i].q = NULL;
+ }
+#endif
+ /* recycle entry for re-use */
+ arp_table[i].state = UNDIARP_STATE_EMPTY;
+ }
+#if ARP_QUEUEING
+ /* still pending entry? (not expired) */
+ if (arp_table[i].state == UNDIARP_STATE_PENDING) {
+ /* resend an ARP query here? */
+ }
+#endif
}
+}
+
+/**
+ * Search the ARP table for a matching or new entry.
+ *
+ * If an IP address is given, return a pending or stable ARP entry that matches
+ * the address. If no match is found, create a new entry with this address set,
+ * but in state ETHARP_EMPTY. The caller must check and possibly change the
+ * state of the returned entry.
+ *
+ * If ipaddr is NULL, return a initialized new entry in state ETHARP_EMPTY.
+ *
+ * In all cases, attempt to create new entries from an empty entry. If no
+ * empty entries are available and UNDIARP_TRY_HARD flag is set, recycle
+ * old entries. Heuristic choose the least important entry for recycling.
+ *
+ * @param ipaddr IP address to find in ARP cache, or to add if not found.
+ * @param flags
+ * - UNDIARP_TRY_HARD: Try hard to create a entry by allowing recycling of
+ * active (stable or pending) entries.
+ *
+ * @return The ARP entry index that matched or is created, ERR_MEM if no
+ * entry is found or could be recycled.
+ */
+static s8_t
+#if LWIP_NETIF_HWADDRHINT
+find_entry(struct ip_addr *ipaddr, u8_t flags, struct netif *netif)
+#else /* LWIP_NETIF_HWADDRHINT */
+find_entry(struct ip_addr *ipaddr, u8_t flags)
+#endif /* LWIP_NETIF_HWADDRHINT */
+{
+ s8_t old_pending = ARP_TABLE_SIZE, old_stable = ARP_TABLE_SIZE;
+ s8_t empty = ARP_TABLE_SIZE;
+ u8_t i = 0, age_pending = 0, age_stable = 0;
+#if ARP_QUEUEING
+ /* oldest entry with packets on queue */
+ s8_t old_queue = ARP_TABLE_SIZE;
+ /* its age */
+ u8_t age_queue = 0;
+#endif
- //printf("undiif_output, len = %d ", r - pkt_buf);
+ /* First, test if the last call to this function asked for the
+ * same address. If so, we're really fast! */
+ if (ipaddr) {
+ /* ipaddr to search for was given */
+#if LWIP_NETIF_HWADDRHINT
+ if ((netif != NULL) && (netif->addr_hint != NULL)) {
+ /* per-pcb cached entry was given */
+ u8_t per_pcb_cache = *(netif->addr_hint);
+ if ((per_pcb_cache < ARP_TABLE_SIZE) && arp_table[per_pcb_cache].state == UNDIARP_STATE_STABLE) {
+ /* the per-pcb-cached entry is stable */
+ if (ip_addr_cmp(ipaddr, &arp_table[per_pcb_cache].ipaddr)) {
+ /* per-pcb cached entry was the right one! */
+ ETHARP_STATS_INC(etharp.cachehit);
+ return per_pcb_cache;
+ }
+ }
+ }
+#else /* #if LWIP_NETIF_HWADDRHINT */
+ if (arp_table[undiarp_cached_entry].state == UNDIARP_STATE_STABLE) {
+ /* the cached entry is stable */
+ if (ip_addr_cmp(ipaddr, &arp_table[undiarp_cached_entry].ipaddr)) {
+ /* cached entry was the right one! */
+ ETHARP_STATS_INC(etharp.cachehit);
+ return undiarp_cached_entry;
+ }
+ }
+#endif /* #if LWIP_NETIF_HWADDRHINT */
+ }
- do {
- memset(&pxe, 0, sizeof pxe);
+ /**
+ * a) do a search through the cache, remember candidates
+ * b) select candidate entry
+ * c) create new entry
+ */
- pxe.xmit.Protocol = 0; /* XXX: P_UNKNOWN: MAC layer */
- pxe.xmit.XmitFlag = !memcmp(pkt_buf, eth_broadcast, sizeof eth_broadcast);
- pxe.xmit.DestAddr = FAR_PTR(&pxe.tbd); /* This is what gPXE does?? */
- pxe.xmit.TBD = FAR_PTR(&pxe.tbd);
- pxe.tbd.ImmedLength = r - pkt_buf;
- pxe.tbd.Xmit = FAR_PTR(pkt_buf);
+ /* a) in a single search sweep, do all of this
+ * 1) remember the first empty entry (if any)
+ * 2) remember the oldest stable entry (if any)
+ * 3) remember the oldest pending entry without queued packets (if any)
+ * 4) remember the oldest pending entry with queued packets (if any)
+ * 5) search for a matching IP entry, either pending or stable
+ * until 5 matches, or all entries are searched for.
+ */
- pxe_call(PXENV_UNDI_TRANSMIT, &pxe.xmit);
- } while (pxe.xmit.Status == PXENV_STATUS_OUT_OF_RESOURCES);
+ for (i = 0; i < ARP_TABLE_SIZE; ++i) {
+ /* no empty entry found yet and now we do find one? */
+ if ((empty == ARP_TABLE_SIZE) && (arp_table[i].state == UNDIARP_STATE_EMPTY)) {
+ LWIP_DEBUGF(ETHARP_DEBUG, ("find_entry: found empty entry %"U16_F"\n", (u16_t)i));
+ /* remember first empty entry */
+ empty = i;
+ }
+ /* pending entry? */
+ else if (arp_table[i].state == UNDIARP_STATE_PENDING) {
+ /* if given, does IP address match IP address in ARP entry? */
+ if (ipaddr && ip_addr_cmp(ipaddr, &arp_table[i].ipaddr)) {
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: found matching pending entry %"U16_F"\n", (u16_t)i));
+ /* found exact IP address match, simply bail out */
+#if LWIP_NETIF_HWADDRHINT
+ NETIF_SET_HINT(netif, i);
+#else /* #if LWIP_NETIF_HWADDRHINT */
+ undiarp_cached_entry = i;
+#endif /* #if LWIP_NETIF_HWADDRHINT */
+ return i;
+#if ARP_QUEUEING
+ /* pending with queued packets? */
+ } else if (arp_table[i].q != NULL) {
+ if (arp_table[i].ctime >= age_queue) {
+ old_queue = i;
+ age_queue = arp_table[i].ctime;
+ }
+#endif
+ /* pending without queued packets? */
+ } else {
+ if (arp_table[i].ctime >= age_pending) {
+ old_pending = i;
+ age_pending = arp_table[i].ctime;
+ }
+ }
+ }
+ /* stable entry? */
+ else if (arp_table[i].state == UNDIARP_STATE_STABLE) {
+ /* if given, does IP address match IP address in ARP entry? */
+ if (ipaddr && ip_addr_cmp(ipaddr, &arp_table[i].ipaddr)) {
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: found matching stable entry %"U16_F"\n", (u16_t)i));
+ /* found exact IP address match, simply bail out */
+#if LWIP_NETIF_HWADDRHINT
+ NETIF_SET_HINT(netif, i);
+#else /* #if LWIP_NETIF_HWADDRHINT */
+ undiarp_cached_entry = i;
+#endif /* #if LWIP_NETIF_HWADDRHINT */
+ return i;
+ /* remember entry with oldest stable entry in oldest, its age in maxtime */
+ } else if (arp_table[i].ctime >= age_stable) {
+ old_stable = i;
+ age_stable = arp_table[i].ctime;
+ }
+ }
+ }
+ /* { we have no match } => try to create a new entry */
+
+ /* no empty entry found and not allowed to recycle? */
+ if (((empty == ARP_TABLE_SIZE) && ((flags & UNDIARP_TRY_HARD) == 0))
+ /* or don't create new entry, only search? */
+ || ((flags & UNDIARP_FIND_ONLY) != 0)) {
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: no empty entry found and not allowed to recycle\n"));
+ return (s8_t)ERR_MEM;
+ }
+
+ /* b) choose the least destructive entry to recycle:
+ * 1) empty entry
+ * 2) oldest stable entry
+ * 3) oldest pending entry without queued packets
+ * 4) oldest pending entry with queued packets
+ *
+ * { UNDIARP_TRY_HARD is set at this point }
+ */
-#if ETH_PAD_SIZE
- pbuf_header(p, ETH_PAD_SIZE); /* reclaim the padding word */
+ /* 1) empty entry available? */
+ if (empty < ARP_TABLE_SIZE) {
+ i = empty;
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: selecting empty entry %"U16_F"\n", (u16_t)i));
+ }
+ /* 2) found recyclable stable entry? */
+ else if (old_stable < ARP_TABLE_SIZE) {
+ /* recycle oldest stable*/
+ i = old_stable;
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: selecting oldest stable entry %"U16_F"\n", (u16_t)i));
+#if ARP_QUEUEING
+ /* no queued packets should exist on stable entries */
+ LWIP_ASSERT("arp_table[i].q == NULL", arp_table[i].q == NULL);
+#endif
+ /* 3) found recyclable pending entry without queued packets? */
+ } else if (old_pending < ARP_TABLE_SIZE) {
+ /* recycle oldest pending */
+ i = old_pending;
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: selecting oldest pending entry %"U16_F" (without queue)\n", (u16_t)i));
+#if ARP_QUEUEING
+ /* 4) found recyclable pending entry with queued packets? */
+ } else if (old_queue < ARP_TABLE_SIZE) {
+ /* recycle oldest pending */
+ i = old_queue;
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: selecting oldest pending entry %"U16_F", freeing packet queue %p\n", (u16_t)i, (void *)(arp_table[i].q)));
+ free_undiarp_q(arp_table[i].q);
+ arp_table[i].q = NULL;
#endif
+ /* no empty or recyclable entries found */
+ } else {
+ return (s8_t)ERR_MEM;
+ }
- LINK_STATS_INC(link.xmit);
+ /* { empty or recyclable entry found } */
+ LWIP_ASSERT("i < ARP_TABLE_SIZE", i < ARP_TABLE_SIZE);
- return ERR_OK;
+ if (arp_table[i].state != UNDIARP_STATE_EMPTY)
+ {
+ snmp_delete_arpidx_tree(arp_table[i].netif, &arp_table[i].ipaddr);
+ }
+ /* recycle entry (no-op for an already empty entry) */
+ arp_table[i].state = UNDIARP_STATE_EMPTY;
+
+ /* IP address given? */
+ if (ipaddr != NULL) {
+ /* set IP address */
+ ip_addr_set(&arp_table[i].ipaddr, ipaddr);
+ }
+ arp_table[i].ctime = 0;
+#if LWIP_NETIF_HWADDRHINT
+ NETIF_SET_HINT(netif, i);
+#else /* #if LWIP_NETIF_HWADDRHINT */
+ undiarp_cached_entry = i;
+#endif /* #if LWIP_NETIF_HWADDRHINT */
+ return (err_t)i;
+}
+
+
+/**
+ * Send an ARP request for the given IP address and/or queue a packet.
+ *
+ * If the IP address was not yet in the cache, a pending ARP cache entry
+ * is added and an ARP request is sent for the given address. The packet
+ * is queued on this entry.
+ *
+ * If the IP address was already pending in the cache, a new ARP request
+ * is sent for the given address. The packet is queued on this entry.
+ *
+ * If the IP address was already stable in the cache, and a packet is
+ * given, it is directly sent and no ARP request is sent out.
+ *
+ * If the IP address was already stable in the cache, and no packet is
+ * given, an ARP request is sent out.
+ *
+ * @param netif The lwIP network interface on which ipaddr
+ * must be queried for.
+ * @param ipaddr The IP address to be resolved.
+ * @param q If non-NULL, a pbuf that must be delivered to the IP address.
+ * q is not freed by this function.
+ *
+ * @note q must only be ONE packet, not a packet queue!
+ *
+ * @return
+ * - ERR_BUF Could not make room for Ethernet header.
+ * - ERR_MEM Hardware address unknown, and no more ARP entries available
+ * to query for address or queue the packet.
+ * - ERR_MEM Could not queue packet due to memory shortage.
+ * - ERR_RTE No route to destination (no gateway to external networks).
+ * - ERR_ARG Non-unicast address given, those will not appear in ARP cache.
+ *
+ */
+static err_t
+undiarp_query(struct netif *netif, struct ip_addr *ipaddr, struct pbuf *q)
+{
+ err_t result = ERR_MEM;
+ s8_t i; /* ARP entry index */
+
+ /* non-unicast address? */
+ if (ip_addr_isbroadcast(ipaddr, netif) ||
+ ip_addr_ismulticast(ipaddr) ||
+ ip_addr_isany(ipaddr)) {
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("undiarp_query: will not add non-unicast IP address to ARP cache\n"));
+ return ERR_ARG;
+ }
+
+ /* find entry in ARP cache, ask to create entry if queueing packet */
+#if LWIP_NETIF_HWADDRHINT
+ i = find_entry(ipaddr, UNDIARP_TRY_HARD, netif);
+#else /* LWIP_NETIF_HWADDRHINT */
+ i = find_entry(ipaddr, UNDIARP_TRY_HARD);
+#endif /* LWIP_NETIF_HWADDRHINT */
+
+ /* could not find or create entry? */
+ if (i < 0) {
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("undiarp_query: could not create ARP entry\n"));
+ if (q) {
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("undiarp_query: packet dropped\n"));
+ ETHARP_STATS_INC(etharp.memerr);
+ }
+ return (err_t)i;
+ }
+
+ /* mark a fresh entry as pending (we just sent a request) */
+ if (arp_table[i].state == UNDIARP_STATE_EMPTY) {
+ arp_table[i].state = UNDIARP_STATE_PENDING;
+ }
+
+ /* { i is either a STABLE or (new or existing) PENDING entry } */
+ LWIP_ASSERT("arp_table[i].state == PENDING or STABLE",
+ ((arp_table[i].state == UNDIARP_STATE_PENDING) ||
+ (arp_table[i].state == UNDIARP_STATE_STABLE)));
+
+ /* do we have a pending entry? or an implicit query request? */
+ if ((arp_table[i].state == UNDIARP_STATE_PENDING) || (q == NULL)) {
+ /* try to resolve it; send out ARP request */
+ result = undiarp_request(netif, ipaddr);
+ if (result != ERR_OK) {
+ /* ARP request couldn't be sent */
+ /* We don't re-send arp request in undiarp_tmr, but we still queue packets,
+ since this failure could be temporary, and the next packet calling
+ etharp_query again could lead to sending the queued packets. */
+ }
+ }
+
+ /* packet given? */
+ if (q != NULL) {
+ /* stable entry? */
+ if (arp_table[i].state == UNDIARP_STATE_STABLE) {
+ /* we have a valid IP->hardware address mapping */
+ /* send the packet */
+ result = undi_send_ip(netif, q, &(arp_table[i].hwaddr));
+ /* pending entry? (either just created or already pending */
+ } else if (arp_table[i].state == UNDIARP_STATE_PENDING) {
+#if ARP_QUEUEING /* queue the given q packet */
+ struct pbuf *p;
+ int copy_needed = 0;
+ /* IF q includes a PBUF_REF, PBUF_POOL or PBUF_RAM, we have no choice but
+ * to copy the whole queue into a new PBUF_RAM (see bug #11400)
+ * PBUF_ROMs can be left as they are, since ROM must not get changed. */
+ p = q;
+ while (p) {
+ LWIP_ASSERT("no packet queues allowed!", (p->len != p->tot_len) || (p->next == 0));
+ if(p->type != PBUF_ROM) {
+ copy_needed = 1;
+ break;
+ }
+ p = p->next;
+ }
+ if(copy_needed) {
+ /* copy the whole packet into new pbufs */
+ p = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
+ if(p != NULL) {
+ if (pbuf_copy(p, q) != ERR_OK) {
+ pbuf_free(p);
+ p = NULL;
+ }
+ }
+ } else {
+ /* referencing the old pbuf is enough */
+ p = q;
+ pbuf_ref(p);
+ }
+ /* packet could be taken over? */
+ if (p != NULL) {
+ /* queue packet ... */
+ struct etharp_q_entry *new_entry;
+ /* allocate a new arp queue entry */
+ new_entry = memp_malloc(MEMP_ARP_QUEUE);
+ if (new_entry != NULL) {
+ new_entry->next = 0;
+ new_entry->p = p;
+ if(arp_table[i].q != NULL) {
+ /* queue was already existent, append the new entry to the end */
+ struct etharp_q_entry *r;
+ r = arp_table[i].q;
+ while (r->next != NULL) {
+ r = r->next;
+ }
+ r->next = new_entry;
+ } else {
+ /* queue did not exist, first item in queue */
+ arp_table[i].q = new_entry;
+ }
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("undiarp_query: queued packet %p on ARP entry %"S16_F"\n", (void *)q, (s16_t)i));
+ result = ERR_OK;
+ } else {
+ /* the pool MEMP_ARP_QUEUE is empty */
+ pbuf_free(p);
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: could not queue a copy of PBUF_REF packet %p (out of memory)\n", (void *)q));
+ /* { result == ERR_MEM } through initialization */
+ }
+ } else {
+ ETHARP_STATS_INC(etharp.memerr);
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: could not queue a copy of PBUF_REF packet %p (out of memory)\n", (void *)q));
+ /* { result == ERR_MEM } through initialization */
+ }
+#else /* ARP_QUEUEING == 0 */
+ /* q && state == PENDING && ARP_QUEUEING == 0 => result = ERR_MEM */
+ /* { result == ERR_MEM } through initialization */
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: Ethernet destination address unknown, queueing disabled, packet %p dropped\n", (void *)q));
+#endif
+ }
+ }
+ return result;
+}
+
+/**
+ * Resolve and fill-in address header for outgoing IP packet.
+ *
+ * For IP multicast and broadcast, corresponding Ethernet addresses
+ * are selected and the packet is transmitted on the link.
+ *
+ * For unicast addresses, the packet is submitted to etharp_query(). In
+ * case the IP address is outside the local network, the IP address of
+ * the gateway is used.
+ *
+ * @param netif The lwIP network interface which the IP packet will be sent on.
+ * @param q The pbuf(s) containing the IP packet to be sent.
+ * @param ipaddr The IP address of the packet destination.
+ *
+ * @return
+ * - ERR_RTE No route to destination (no gateway to external networks),
+ * or the return type of either etharp_query() or etharp_send_ip().
+ */
+static err_t
+undiarp_output(struct netif *netif, struct pbuf *q, struct ip_addr *ipaddr)
+{
+ static __lowmem t_PXENV_UNDI_GET_MCAST_ADDR get_mcast;
+ hwaddr_t *dest;
+
+ if (undi_is_ethernet(netif))
+ return etharp_output(netif, q, ipaddr);
+
+ /* Assume unresolved hardware address */
+ dest = NULL;
+
+ /* Determine on destination hardware address. Broadcasts and multicasts
+ * are special, other IP addresses are looked up in the ARP table.
+ */
+ if (ip_addr_isbroadcast(ipaddr, netif)) {
+ dest = NULL;
+ }
+ else if (ip_addr_ismulticast(ipaddr)) {
+ memset(&get_mcast, 0, sizeof get_mcast);
+ memcpy(&get_mcast.InetAddr, ipaddr, sizeof(get_mcast.InetAddr));
+ pxe_call(PXENV_UNDI_GET_MCAST_ADDR, &get_mcast);
+ dest = (hwaddr_t *)&get_mcast.MediaAddr;
+ }
+ else {
+ /* outside local network? */
+ if (!ip_addr_netcmp(ipaddr, &netif->ip_addr, &netif->netmask)) {
+ /* interface has default gateway? */
+ if (netif->gw.addr != 0) {
+ /* send to hardware address of default gateway IP address */
+ ipaddr = &(netif->gw);
+ /* no default gateway available */
+ } else {
+ /* no route to destination error (default gateway missing) */
+ return ERR_RTE;
+ }
+ }
+ /* queue on destination Ethernet address belonging to ipaddr */
+ return undiarp_query(netif, ipaddr, q);
+ }
+
+ /* continuation for multicast/broadcast destinations */
+ /* obtain source Ethernet address of the given interface */
+ /* send packet directly on the link */
+ return undi_send_ip(netif, q, dest);
}
static void get_packet_fragment(t_PXENV_UNDI_ISR *isr)
//printf("undiif_input, len = %d\n", len);
-#if ETH_PAD_SIZE
- len += ETH_PAD_SIZE; /* allow room for Ethernet padding */
-#endif
-
/* We allocate a pbuf chain of pbufs from the pool. */
p = pbuf_alloc(PBUF_RAW, len, PBUF_POOL);
if (p != NULL) {
-#if ETH_PAD_SIZE
- pbuf_header(p, -ETH_PAD_SIZE); /* drop the padding word */
-#endif
-
/*
* We iterate over the pbuf chain until we have read the entire
* packet into the pbuf.
}
}
-#if ETH_PAD_SIZE
- pbuf_header(p, ETH_PAD_SIZE); /* reclaim the padding word */
-#endif
-
LINK_STATS_INC(link.recv);
} else {
/*
return p;
}
+
+/**
+ * Update (or insert) a IP/MAC address pair in the ARP cache.
+ *
+ * If a pending entry is resolved, any queued packets will be sent
+ * at this point.
+ *
+ * @param ipaddr IP address of the inserted ARP entry.
+ * @param ethaddr Ethernet address of the inserted ARP entry.
+ * @param flags Defines behaviour:
+ * - ETHARP_TRY_HARD Allows ARP to insert this as a new item. If not specified,
+ * only existing ARP entries will be updated.
+ *
+ * @return
+ * - ERR_OK Succesfully updated ARP cache.
+ * - ERR_MEM If we could not add a new ARP entry when ETHARP_TRY_HARD was set.
+ * - ERR_ARG Non-unicast address given, those will not appear in ARP cache.
+ *
+ * @see pbuf_free()
+ */
+static err_t
+update_arp_entry(struct netif *netif, struct ip_addr *ipaddr,
+ hwaddr_t *lladdr, u8_t flags)
+{
+ s8_t i;
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("update_arp_entry()\n"));
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("update_arp_entry: %"U16_F".%"U16_F".%"U16_F".%"U16_F" - %02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F"\n",
+ ip4_addr1(ipaddr), ip4_addr2(ipaddr), ip4_addr3(ipaddr), ip4_addr4(ipaddr),
+ lladdr->addr[0], lladdr->addr[1], lladdr->addr[2],
+ lladdr->addr[3], lladdr->addr[4], lladdr->addr[5]));
+ /* non-unicast address? */
+ if (ip_addr_isany(ipaddr) ||
+ ip_addr_isbroadcast(ipaddr, netif) ||
+ ip_addr_ismulticast(ipaddr)) {
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("update_arp_entry: will not add non-unicast IP address to ARP cache\n"));
+ return ERR_ARG;
+ }
+ /* find or create ARP entry */
+#if LWIP_NETIF_HWADDRHINT
+ i = find_entry(ipaddr, flags, netif);
+#else /* LWIP_NETIF_HWADDRHINT */
+ i = find_entry(ipaddr, flags);
+#endif /* LWIP_NETIF_HWADDRHINT */
+ /* bail out if no entry could be found */
+ if (i < 0)
+ return (err_t)i;
+
+ /* mark it stable */
+ arp_table[i].state = UNDIARP_STATE_STABLE;
+ /* record network interface */
+ arp_table[i].netif = netif;
+
+ /* insert in SNMP ARP index tree */
+ snmp_insert_arpidx_tree(netif, &arp_table[i].ipaddr);
+
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("update_arp_entry: updating stable entry %"S16_F"\n", (s16_t)i));
+ /* update address */
+ memcpy(arp_table[i].hwaddr, lladdr, netif->hwaddr_len);
+
+ /* reset time stamp */
+ arp_table[i].ctime = 0;
+#if ARP_QUEUEING
+ /* this is where we will send out queued packets! */
+ while (arp_table[i].q != NULL) {
+ struct pbuf *p;
+ /* remember remainder of queue */
+ struct etharp_q_entry *q = arp_table[i].q;
+ /* pop first item off the queue */
+ arp_table[i].q = q->next;
+ /* get the packet pointer */
+ p = q->p;
+ /* now queue entry can be freed */
+ memp_free(MEMP_ARP_QUEUE, q);
+ /* send the queued IP packet */
+ undi_send_ip(netif, p, lladdr);
+ /* free the queued IP packet */
+ pbuf_free(p);
+ }
+#endif
+ return ERR_OK;
+}
+
+/**
+ * Responds to ARP requests to us. Upon ARP replies to us, add entry to cache
+ * send out queued IP packets. Updates cache with snooped address pairs.
+ *
+ * Should be called for incoming ARP packets. The pbuf in the argument
+ * is freed by this function.
+ *
+ * @param netif The lwIP network interface on which the ARP packet pbuf arrived.
+ * @param ethaddr Ethernet address of netif.
+ * @param p The ARP packet that arrived on netif. Is freed by this function.
+ *
+ * @return NULL
+ *
+ * @see pbuf_free()
+ */
+static void
+undiarp_input(struct netif *netif, struct pbuf *p)
+{
+ struct arp_hdr *hdr;
+ /* these are aligned properly, whereas the ARP header fields might not be */
+ struct ip_addr sipaddr, dipaddr;
+ hwaddr_t hwaddr_remote;
+ u8_t *hdr_ptr;
+ u8_t for_us;
+
+ LWIP_ERROR("netif != NULL", (netif != NULL), return;);
+
+ /* drop short ARP packets: we have to check for p->len instead of p->tot_len here
+ since a struct arp_hdr is pointed to p->payload, so it musn't be chained! */
+ if (p->len < arp_hdr_len(netif)) {
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
+ ("undiarp_input: packet dropped, too short (%"S16_F"/%"S16_F")\n", p->tot_len,
+ (s16_t)SIZEOF_ETHARP_PACKET));
+ printf("short arp packet\n");
+ ETHARP_STATS_INC(etharp.lenerr);
+ ETHARP_STATS_INC(etharp.drop);
+ pbuf_free(p);
+ return;
+ }
+
+ hdr = p->payload;
+ /* RFC 826 "Packet Reception": */
+ if ((hdr->hwtype != htons(undi_hw_type)) ||
+ (hdr->_hwlen_protolen != htons((netif->hwaddr_len << 8) | sizeof(struct ip_addr))) ||
+ (hdr->proto != htons(ETHTYPE_IP))) {
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
+ ("undiarp_input: packet dropped, wrong hw type, hwlen, proto, or protolen (%"U16_F"/%"U16_F"/%"U16_F"/%"U16_F"/%"U16_F")\n",
+ hdr->hwtype, ARPH_HWLEN(hdr), hdr->proto, ARPH_PROTOLEN(hdr)));
+ ETHARP_STATS_INC(etharp.proterr);
+ ETHARP_STATS_INC(etharp.drop);
+ printf("malformed arp packet\n");
+ pbuf_free(p);
+ return;
+ }
+ ETHARP_STATS_INC(etharp.recv);
+
+ /* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
+ * structure packing (not using structure copy which breaks strict-aliasing rules). */
+ hdr_ptr = (unsigned char *)(hdr + 1);
+ memcpy(hwaddr_remote, hdr_ptr, netif->hwaddr_len);
+ hdr_ptr += netif->hwaddr_len;
+ memcpy(&sipaddr, hdr_ptr, sizeof(sipaddr));
+ hdr_ptr += sizeof(sipaddr);
+ hdr_ptr += netif->hwaddr_len;
+ memcpy(&dipaddr, hdr_ptr, sizeof(dipaddr));
+
+ /* this interface is not configured? */
+ if (netif->ip_addr.addr == 0) {
+ for_us = 0;
+ } else {
+ /* ARP packet directed to us? */
+ for_us = ip_addr_cmp(&dipaddr, &(netif->ip_addr));
+ }
+
+ /* ARP message directed to us? */
+ if (for_us) {
+ /* add IP address in ARP cache; assume requester wants to talk to us.
+ * can result in directly sending the queued packets for this host. */
+ update_arp_entry(netif, &sipaddr, &hwaddr_remote, UNDIARP_TRY_HARD);
+ /* ARP message not directed to us? */
+ } else {
+ /* update the source IP address in the cache, if present */
+ update_arp_entry(netif, &sipaddr, &hwaddr_remote, 0);
+ }
+
+ /* now act on the message itself */
+ switch (htons(hdr->opcode)) {
+ /* ARP request? */
+ case ARP_REQUEST:
+ /* ARP request. If it asked for our address, we send out a
+ * reply. In any case, we time-stamp any existing ARP entry,
+ * and possiby send out an IP packet that was queued on it. */
+
+ LWIP_DEBUGF (ETHARP_DEBUG | LWIP_DBG_TRACE, ("undiarp_input: incoming ARP request\n"));
+ /* ARP request for our address? */
+ if (for_us) {
+
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("undiarp_input: replying to ARP request for our IP address\n"));
+ /* Re-use pbuf to send ARP reply.
+ Since we are re-using an existing pbuf, we can't call etharp_raw since
+ that would allocate a new pbuf. */
+ hdr->opcode = htons(ARP_REPLY);
+ hdr_ptr = (unsigned char *)(hdr + 1);
+ memcpy(hdr_ptr, &netif->hwaddr, netif->hwaddr_len);
+ hdr_ptr += netif->hwaddr_len;
+ memcpy(hdr_ptr, &dipaddr, sizeof(dipaddr));
+ hdr_ptr += sizeof(dipaddr);
+ memcpy(hdr_ptr, &hwaddr_remote, netif->hwaddr_len);
+ hdr_ptr += netif->hwaddr_len;
+ memcpy(hdr_ptr, &sipaddr, sizeof(sipaddr));
+
+ /* return ARP reply */
+ undi_send_arp(netif, p, &hwaddr_remote);
+ /* we are not configured? */
+ } else if (netif->ip_addr.addr == 0) {
+ /* { for_us == 0 and netif->ip_addr.addr == 0 } */
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("undiarp_input: we are unconfigured, ARP request ignored.\n"));
+ /* request was not directed to us */
+ } else {
+ /* { for_us == 0 and netif->ip_addr.addr != 0 } */
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("undiarp_input: ARP request was not for us.\n"));
+ }
+ break;
+ case ARP_REPLY:
+ /* ARP reply. We already updated the ARP cache earlier. */
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("undiarp_input: incoming ARP reply\n"));
+#if (LWIP_DHCP && DHCP_DOES_ARP_CHECK)
+ /* DHCP wants to know about ARP replies from any host with an
+ * IP address also offered to us by the DHCP server. We do not
+ * want to take a duplicate IP address on a single network.
+ * @todo How should we handle redundant (fail-over) interfaces? */
+ dhcp_arp_reply(netif, &sipaddr);
+#endif
+ break;
+ default:
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("undiarp_input: ARP unknown opcode type %"S16_F"\n", htons(hdr->opcode)));
+ ETHARP_STATS_INC(etharp.err);
+ break;
+ }
+ /* free ARP packet */
+ pbuf_free(p);
+}
+
/**
* This function should be called when a packet is ready to be read
* from the interface. It uses the function low_level_input() that
*/
void undiif_input(t_PXENV_UNDI_ISR *isr)
{
- struct eth_hdr *ethhdr;
struct pbuf *p;
+ u8_t undi_prot;
+ u16_t llhdr_len;
+
+ /* From the first isr capture the essential information */
+ undi_prot = isr->ProtType;
+ llhdr_len = isr->FrameHeaderLength;
/* move received packet into a new pbuf */
p = low_level_input(isr);
/* no packet could be read, silently ignore this */
if (p == NULL) return;
- /* points to packet payload, which starts with an Ethernet header */
- ethhdr = p->payload;
- switch (htons(ethhdr->type)) {
- /* IP or ARP packet? */
- case ETHTYPE_IP:
- case ETHTYPE_ARP:
+ if (undi_is_ethernet(&undi_netif)) {
+ /* points to packet payload, which starts with an Ethernet header */
+ struct eth_hdr *ethhdr = p->payload;
+
+ switch (htons(ethhdr->type)) {
+ /* IP or ARP packet? */
+ case ETHTYPE_IP:
+ case ETHTYPE_ARP:
#if PPPOE_SUPPORT
- /* PPPoE packet? */
- case ETHTYPE_PPPOEDISC:
- case ETHTYPE_PPPOE:
+ /* PPPoE packet? */
+ case ETHTYPE_PPPOEDISC:
+ case ETHTYPE_PPPOE:
#endif /* PPPOE_SUPPORT */
- /* full packet send to tcpip_thread to process */
- if (undi_netif.input(p, &undi_netif)!=ERR_OK)
- { LWIP_DEBUGF(NETIF_DEBUG, ("undiif_input: IP input error\n"));
- pbuf_free(p);
- p = NULL;
- }
- break;
+ /* full packet send to tcpip_thread to process */
+ if (ethernet_input(p, &undi_netif)!=ERR_OK)
+ { LWIP_DEBUGF(NETIF_DEBUG, ("undiif_input: IP input error\n"));
+ pbuf_free(p);
+ p = NULL;
+ }
+ break;
- default:
- pbuf_free(p);
- p = NULL;
- break;
+ default:
+ pbuf_free(p);
+ p = NULL;
+ break;
+ }
+ } else {
+ if (pbuf_header(p, -(s16_t)llhdr_len)) {
+ LWIP_ASSERT("Can't move link level header in packet", 0);
+ pbuf_free(p);
+ p = NULL;
+ } else {
+ switch(undi_prot) {
+ case P_IP:
+ /* pass to IP layer */
+ ip_input(p, &undi_netif);
+ break;
+
+ case P_ARP:
+ /* pass p to ARP module */
+ undiarp_input(&undi_netif, p);
+ break;
+
+ default:
+ ETHARP_STATS_INC(etharp.proterr);
+ ETHARP_STATS_INC(etharp.drop);
+ pbuf_free(p);
+ p = NULL;
+ break;
+ }
+ }
}
}
* ERR_MEM if private data couldn't be allocated
* any other err_t on error
*/
-static err_t
+err_t
undiif_init(struct netif *netif)
{
LWIP_ASSERT("netif != NULL", (netif != NULL));
netif->state = NULL; /* Private pointer if we need it */
netif->name[0] = IFNAME0;
netif->name[1] = IFNAME1;
- /* We directly use etharp_output() here to save a function call.
- * You can instead declare your own function an call etharp_output()
- * from it if you have to do some checks before sending (e.g. if link
- * is available...) */
- netif->output = etharp_output;
- netif->linkoutput = low_level_output;
+ netif->output = undiarp_output;
+ netif->linkoutput = undi_send_unknown;
/* initialize the hardware */
low_level_init(netif);
((uint8_t *)gw)[2],
((uint8_t *)gw)[3]);
err = netifapi_netif_add(&undi_netif, ipaddr, netmask, gw, NULL,
- undiif_init, ethernet_input);
+ undiif_init, ip_input);
if (err)
return err;