net: Move MAC-seeded rand out of bootp.c
Make the MAC-seeded random number generator available to /net in
general. MAC-seeded rand will be needed by link-local as well, so
give it an interface.
Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/net/bootp.c b/net/bootp.c
index d0a7da2..0185e56 100644
--- a/net/bootp.c
+++ b/net/bootp.c
@@ -12,6 +12,7 @@
#include <command.h>
#include <net.h>
#include "bootp.h"
+#include "net_rand.h"
#include "tftp.h"
#include "nfs.h"
#ifdef CONFIG_STATUS_LED
@@ -37,9 +38,6 @@
ulong BootpID;
int BootpTry;
-#ifdef CONFIG_BOOTP_RANDOM_DELAY
-ulong seed1, seed2;
-#endif
#if defined(CONFIG_CMD_DHCP)
dhcp_state_t dhcp_state = INIT;
@@ -584,6 +582,9 @@
uchar *pkt, *iphdr;
struct Bootp_t *bp;
int ext_len, pktlen, iplen;
+#ifdef CONFIG_BOOTP_RANDOM_DELAY
+ ulong i, rand_ms;
+#endif
bootstage_mark_name(BOOTSTAGE_ID_BOOTP_START, "bootp_start");
#if defined(CONFIG_CMD_DHCP)
@@ -591,60 +592,16 @@
#endif
#ifdef CONFIG_BOOTP_RANDOM_DELAY /* Random BOOTP delay */
- unsigned char bi_enetaddr[6];
- int reg;
- ulong tst1, tst2, sum, m_mask, m_value = 0;
+ if (BootpTry == 0)
+ srand_mac();
- if (BootpTry == 0) {
- /* get our mac */
- eth_getenv_enetaddr("ethaddr", bi_enetaddr);
+ if (BootpTry <= 2) /* Start with max 1024 * 1ms */
+ rand_ms = rand() >> (22 - BootpTry);
+ else /* After 3rd BOOTP request max 8192 * 1ms */
+ rand_ms = rand() >> 19;
- debug("BootpRequest => Our Mac: ");
- for (reg = 0; reg < 6; reg++)
- debug("%x%c", bi_enetaddr[reg], reg == 5 ? '\n' : ':');
-
- /* Mac-Manipulation 2 get seed1 */
- tst1 = 0;
- tst2 = 0;
- for (reg = 2; reg < 6; reg++) {
- tst1 = tst1 << 8;
- tst1 = tst1 | bi_enetaddr[reg];
- }
- for (reg = 0; reg < 2; reg++) {
- tst2 = tst2 | bi_enetaddr[reg];
- tst2 = tst2 << 8;
- }
-
- seed1 = tst1^tst2;
-
- /* Mirror seed1*/
- m_mask = 0x1;
- for (reg = 1; reg <= 32; reg++) {
- m_value |= (m_mask & seed1);
- seed1 = seed1 >> 1;
- m_value = m_value << 1;
- }
- seed1 = m_value;
- seed2 = 0xB78D0945;
- }
-
- /* Random Number Generator */
- for (reg = 0; reg <= 0; reg++) {
- sum = seed1 + seed2;
- if (sum < seed1 || sum < seed2)
- sum++;
- seed2 = seed1;
- seed1 = sum;
-
- if (BootpTry <= 2) { /* Start with max 1024 * 1ms */
- sum = sum >> (22-BootpTry);
- } else { /*After 3rd BOOTP request max 8192 * 1ms */
- sum = sum >> 19;
- }
- }
-
- printf("Random delay: %ld ms...\n", sum);
- for (reg = 0; reg < sum; reg++)
+ printf("Random delay: %ld ms...\n", rand_ms);
+ for (i = 0; i < rand_ms; i++)
udelay(1000); /*Wait 1ms*/
#endif /* CONFIG_BOOTP_RANDOM_DELAY */
