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Diffstat (limited to 'net')
-rw-r--r--net/net.c188
-rw-r--r--net/nfs.h10
-rw-r--r--net/tftp.c51
3 files changed, 238 insertions, 11 deletions
diff --git a/net/net.c b/net/net.c
index d1cc9b2..cab4b2d 100644
--- a/net/net.c
+++ b/net/net.c
@@ -1107,6 +1107,176 @@ static void CDPStart(void)
}
#endif
+#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_NO_UDP)
+
+/*
+ * 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 IP_t *__NetDefragment(IP_t *ip, int *lenp)
+{
+ static uchar pkt_buff[IP_PKTSIZE] __attribute__((aligned(PKTALIGN)));
+ static u16 first_hole, total_len;
+ struct hole *payload, *thisfrag, *h, *newh;
+ IP_t *localip = (IP_t *)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_NO_UDP);
+ offset8 = (ip_off & IP_OFFS);
+ thisfrag = payload + offset8;
+ start = offset8 * 8;
+ len = ntohs(ip->ip_len) - IP_HDR_SIZE_NO_UDP;
+
+ 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_NO_UDP);
+ }
+
+ /*
+ * 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;
+ }
+
+ if (offset8 + (len / 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_NO_UDP, len);
+ if (!done)
+ return NULL;
+
+ localip->ip_len = htons(total_len);
+ *lenp = total_len + IP_HDR_SIZE_NO_UDP;
+ return localip;
+}
+
+static inline IP_t *NetDefragment(IP_t *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 IP_t *NetDefragment(IP_t *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
void
NetReceive(volatile uchar * inpkt, int len)
@@ -1333,10 +1503,12 @@ NetReceive(volatile uchar * inpkt, int len)
case PROT_IP:
debug("Got IP\n");
+ /* Before we start poking the header, make sure it is there */
if (len < IP_HDR_SIZE) {
debug("len bad %d < %lu\n", len, (ulong)IP_HDR_SIZE);
return;
}
+ /* Check the packet length */
if (len < ntohs(ip->ip_len)) {
printf("len bad %d < %d\n", len, ntohs(ip->ip_len));
return;
@@ -1344,21 +1516,20 @@ NetReceive(volatile uchar * inpkt, int len)
len = ntohs(ip->ip_len);
debug("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 fragments */
- if (ip->ip_off & htons(IP_OFFS | IP_FLAGS_MFRAG)) {
- return;
- }
- /* can't deal with headers > 20 bytes */
+ /* Can't deal with IP options (headers != 20 bytes) */
if ((ip->ip_hl_v & 0x0f) > 0x05) {
return;
}
+ /* Check the Checksum of the header */
if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) {
puts ("checksum bad\n");
return;
}
+ /* If it is not for us, ignore it */
tmp = NetReadIP(&ip->ip_dst);
if (NetOurIP && tmp != NetOurIP && tmp != 0xFFFFFFFF) {
#ifdef CONFIG_MCAST_TFTP
@@ -1367,6 +1538,13 @@ NetReceive(volatile uchar * inpkt, int len)
return;
}
/*
+ * 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)
+ */
+ if (!(ip = NetDefragment(ip, &len)))
+ return;
+ /*
* watch for ICMP host redirects
*
* There is no real handler code (yet). We just watch
diff --git a/net/nfs.h b/net/nfs.h
index 712afa0..de8a0c6 100644
--- a/net/nfs.h
+++ b/net/nfs.h
@@ -38,8 +38,14 @@
/* Block size used for NFS read accesses. A RPC reply packet (including all
* headers) must fit within a single Ethernet frame to avoid fragmentation.
- * Chosen to be a power of two, as most NFS servers are optimized for this. */
-#define NFS_READ_SIZE 1024
+ * However, if CONFIG_IP_DEFRAG is set, the config file may want to use a
+ * bigger value. In any case, most NFS servers are optimized for a power of 2.
+ */
+#ifdef CONFIG_NFS_READ_SIZE
+#define NFS_READ_SIZE CONFIG_NFS_READ_SIZE
+#else
+#define NFS_READ_SIZE 1024 /* biggest power of two that fits Ether frame */
+#endif
#define NFS_MAXLINKDEPTH 16
diff --git a/net/tftp.c b/net/tftp.c
index fb98a34..cc60a3b 100644
--- a/net/tftp.c
+++ b/net/tftp.c
@@ -56,6 +56,10 @@ static ulong TftpLastBlock; /* last packet sequence number received */
static ulong TftpBlockWrap; /* count of sequence number wraparounds */
static ulong TftpBlockWrapOffset; /* memory offset due to wrapping */
static int TftpState;
+#ifdef CONFIG_TFTP_TSIZE
+static int TftpTsize; /* The file size reported by the server */
+static short TftpNumchars; /* The number of hashes we printed */
+#endif
#define STATE_RRQ 1
#define STATE_DATA 2
@@ -84,8 +88,14 @@ extern flash_info_t flash_info[];
/* 512 is poor choice for ethernet, MTU is typically 1500.
* Minus eth.hdrs thats 1468. Can get 2x better throughput with
* almost-MTU block sizes. At least try... fall back to 512 if need be.
+ * (but those using CONFIG_IP_DEFRAG may want to set a larger block in cfg file)
*/
+#ifdef CONFIG_TFTP_BLOCKSIZE
+#define TFTP_MTU_BLOCKSIZE CONFIG_TFTP_BLOCKSIZE
+#else
#define TFTP_MTU_BLOCKSIZE 1468
+#endif
+
static unsigned short TftpBlkSize=TFTP_BLOCK_SIZE;
static unsigned short TftpBlkSizeOption=TFTP_MTU_BLOCKSIZE;
@@ -196,6 +206,10 @@ TftpSend (void)
sprintf((char *)pkt, "%lu", TIMEOUT / 1000);
debug("send option \"timeout %s\"\n", (char *)pkt);
pkt += strlen((char *)pkt) + 1;
+#ifdef CONFIG_TFTP_TSIZE
+ memcpy((char *)pkt, "tsize\0000\0", 8);
+ pkt += 8;
+#endif
/* try for more effic. blk size */
pkt += sprintf((char *)pkt,"blksize%c%d%c",
0,TftpBlkSizeOption,0);
@@ -307,8 +321,14 @@ TftpHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
simple_strtoul((char*)pkt+i+8,NULL,10);
debug("Blocksize ack: %s, %d\n",
(char*)pkt+i+8,TftpBlkSize);
- break;
}
+#ifdef CONFIG_TFTP_TSIZE
+ if (strcmp ((char*)pkt+i,"tsize") == 0) {
+ TftpTsize = simple_strtoul((char*)pkt+i+6,NULL,10);
+ debug("size = %s, %d\n",
+ (char*)pkt+i+6, TftpTsize);
+ }
+#endif
}
#ifdef CONFIG_MCAST_TFTP
parse_multicast_oack((char *)pkt,len-1);
@@ -334,7 +354,16 @@ TftpHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
TftpBlockWrap++;
TftpBlockWrapOffset += TftpBlkSize * TFTP_SEQUENCE_SIZE;
printf ("\n\t %lu MB received\n\t ", TftpBlockWrapOffset>>20);
- } else {
+ }
+#ifdef CONFIG_TFTP_TSIZE
+ else if (TftpTsize) {
+ while (TftpNumchars < NetBootFileXferSize * 50 / TftpTsize) {
+ putc('#');
+ TftpNumchars++;
+ }
+ }
+#endif
+ else {
if (((TftpBlock - 1) % 10) == 0) {
putc ('#');
} else if ((TftpBlock % (10 * HASHES_PER_LINE)) == 0) {
@@ -428,6 +457,13 @@ TftpHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
* We received the whole thing. Try to
* run it.
*/
+#ifdef CONFIG_TFTP_TSIZE
+ /* Print out the hash marks for the last packet received */
+ while (TftpTsize && TftpNumchars < 49) {
+ putc('#');
+ TftpNumchars++;
+ }
+#endif
puts ("\ndone\n");
NetState = NETLOOP_SUCCESS;
}
@@ -466,9 +502,12 @@ TftpTimeout (void)
void
TftpStart (void)
{
-#ifdef CONFIG_TFTP_PORT
char *ep; /* Environment pointer */
-#endif
+
+ /* Allow the user to choose tftpblocksize */
+ if ((ep = getenv("tftpblocksize")) != NULL)
+ TftpBlkSizeOption = simple_strtol(ep, NULL, 10);
+ debug("tftp block size is %i\n", TftpBlkSizeOption);
TftpServerIP = NetServerIP;
if (BootFile[0] == '\0') {
@@ -554,6 +593,10 @@ TftpStart (void)
#ifdef CONFIG_MCAST_TFTP
mcast_cleanup();
#endif
+#ifdef CONFIG_TFTP_TSIZE
+ TftpTsize = 0;
+ TftpNumchars = 0;
+#endif
TftpSend ();
}
generated by cgit v1.1 at 2024-11-06 15:34:00 +0000