diff options
Diffstat (limited to 'usr/src/uts/common/os/ip_cksum.c')
| -rw-r--r-- | usr/src/uts/common/os/ip_cksum.c | 134 |
1 files changed, 1 insertions, 133 deletions
diff --git a/usr/src/uts/common/os/ip_cksum.c b/usr/src/uts/common/os/ip_cksum.c index 51a93dfa24..862b33cd11 100644 --- a/usr/src/uts/common/os/ip_cksum.c +++ b/usr/src/uts/common/os/ip_cksum.c @@ -22,6 +22,7 @@ * Copyright 2009 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. * Copyright 2021 Joyent, Inc. + * Copyright 2022 Garrett D'Amore */ /* Copyright (c) 1990 Mentat Inc. */ @@ -37,9 +38,6 @@ #include <inet/ip.h> #include <inet/ip6.h> -#include <sys/multidata.h> -#include <sys/multidata_impl.h> - extern unsigned int ip_ocsum(ushort_t *, int, unsigned int); /* @@ -401,136 +399,6 @@ sctp_cksum(mblk_t *mp, int offset) return (crc32); } -/* - * Routine to compute Internet checksum (16-bit 1's complement) of a given - * Multidata packet descriptor. As in the non-Multidata routine, this doesn't - * 1's complement the result, such that it may be used to compute partial - * checksums. Since it works on buffer spans rather than mblks, this routine - * does not handle existing partial checksum value as in the STRUIO_IP special - * mblk case (supporting this is rather trivial, but is perhaps of no use at - * the moment unless synchronous streams and delayed checksum calculation are - * revived.) - * - * Note also here that the given Multidata packet descriptor must refer to - * a header buffer, i.e. it must have a header fragment. In addition, the - * offset must lie within the boundary of the header fragment. For the - * outbound tcp (MDT) case, this will not be an issue because the stack - * ensures that such conditions are met, and that there is no need whatsoever - * to compute partial checksums on an arbitrary offset that is not part of - * the header fragment. We may need to revisit this routine to handle all - * cases of the inbound (MDR) case, especially when we need to perform partial - * checksum calculation due to padded bytes (non-zeroes) in the frame. - */ -uint_t -ip_md_cksum(pdesc_t *pd, int offset, uint_t sum) -{ - pdescinfo_t *pdi = &pd->pd_pdi; - uchar_t *reg_start, *reg_end; - ssize_t mlen, i; - ushort_t *w; - boolean_t byteleft = B_FALSE; - - ASSERT((pdi->flags & PDESC_HAS_REF) != 0); - ASSERT(pdi->hdr_rptr != NULL && pdi->hdr_wptr != NULL); - ASSERT(offset <= PDESC_HDRL(pdi)); - - for (i = 0; i < pdi->pld_cnt + 1; i++) { - if (i == 0) { - reg_start = pdi->hdr_rptr; - reg_end = pdi->hdr_wptr; - } else { - reg_start = pdi->pld_ary[i - 1].pld_rptr; - reg_end = pdi->pld_ary[i - 1].pld_wptr; - offset = 0; - } - - w = (ushort_t *)(reg_start + offset); - mlen = reg_end - (uchar_t *)w; - - if (mlen > 0 && byteleft) { - /* - * There is a byte left from the last - * segment; add it into the checksum. - * Don't have to worry about a carry- - * out here because we make sure that - * high part of (32 bit) sum is small - * below. - */ -#ifdef _LITTLE_ENDIAN - sum += *(uchar_t *)w << 8; -#else - sum += *(uchar_t *)w; -#endif - w = (ushort_t *)((char *)w + 1); - mlen--; - byteleft = B_FALSE; - } - - if (mlen == 0) - continue; - - if (is_even(w)) { - sum = ip_ocsum(w, mlen >> 1, sum); - w += mlen >> 1; - /* - * If we had an odd number of bytes, - * then the last byte goes in the high - * part of the sum, and we take the - * first byte to the low part of the sum - * the next time around the loop. - */ - if (is_odd(mlen)) { -#ifdef _LITTLE_ENDIAN - sum += *(uchar_t *)w; -#else - sum += *(uchar_t *)w << 8; -#endif - byteleft = B_TRUE; - } - } else { - ushort_t swsum; -#ifdef _LITTLE_ENDIAN - sum += *(uchar_t *)w; -#else - sum += *(uchar_t *)w << 8; -#endif - mlen--; - w = (ushort_t *)(1 + (uintptr_t)w); - - /* Do a separate checksum and copy operation */ - swsum = ip_ocsum(w, mlen >> 1, 0); - sum += ((swsum << 8) & 0xffff) | (swsum >> 8); - w += mlen >> 1; - /* - * If we had an even number of bytes, - * then the last byte goes in the low - * part of the sum. Otherwise we had an - * odd number of bytes and we take the first - * byte to the low part of the sum the - * next time around the loop. - */ - if (is_odd(mlen)) { -#ifdef _LITTLE_ENDIAN - sum += *(uchar_t *)w << 8; -#else - sum += *(uchar_t *)w; -#endif - } else { - byteleft = B_TRUE; - } - } - } - - /* - * Add together high and low parts of sum and carry to get cksum. - * Have to be careful to not drop the last carry here. - */ - sum = (sum & 0xffff) + (sum >> 16); - sum = (sum & 0xffff) + (sum >> 16); - - return (sum); -} - /* Return the IP checksum for the IP header at "iph". */ uint16_t ip_csum_hdr(ipha_t *ipha) |