diff options
Diffstat (limited to 'libexec/bootpd')
| -rw-r--r-- | libexec/bootpd/bootp.h | 2 | ||||
| -rw-r--r-- | libexec/bootpd/bootpd.c | 4 |
2 files changed, 4 insertions, 2 deletions
diff --git a/libexec/bootpd/bootp.h b/libexec/bootpd/bootp.h index 479dd3b..c3a3909 100644 --- a/libexec/bootpd/bootp.h +++ b/libexec/bootpd/bootp.h @@ -38,6 +38,8 @@ SOFTWARE. #define BP_FILE_LEN 128 #define BP_VEND_LEN 64 #define BP_MINPKTSZ 300 /* to check sizeof(struct bootp) */ +/* Overhead to fit a bootp message into an Ethernet packet. */ +#define BP_MSG_OVERHEAD (14 + 20 + 8) /* Ethernet + IP + UDP headers */ struct bootp { unsigned char bp_op; /* packet opcode type */ diff --git a/libexec/bootpd/bootpd.c b/libexec/bootpd/bootpd.c index aac6263..54de708 100644 --- a/libexec/bootpd/bootpd.c +++ b/libexec/bootpd/bootpd.c @@ -1292,10 +1292,10 @@ dovend_rfc1048(bp, hp, bootsize) p += len; } - if (msgsz > sizeof(*bp)) { + if (msgsz > sizeof(*bp) + BP_MSG_OVERHEAD) { if (debug > 1) report(LOG_INFO, "request has DHCP msglen=%d", msgsz); - pktlen = msgsz; + pktlen = msgsz - BP_MSG_OVERHEAD; } } } |
