pdmnetinline.h revision 6dd8f5023a9ba7588212331db90059553136fe33
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * PDM - Networking Helpers, Inlined Code. (DEV,++)
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * This is all inlined because it's too tedious to create 2-3 libraries to
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * contain it all (same bad excuse as for intnetinline.h). C++ only because of
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * mixed code and variables.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * Copyright (C) 2010 Sun Microsystems, Inc.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * This file is part of VirtualBox Open Source Edition (OSE), as
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * available from http://www.virtualbox.org. This file is free software;
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * you can redistribute it and/or modify it under the terms of the GNU
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * General Public License (GPL) as published by the Free Software
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * Foundation, in version 2 as it comes in the "COPYING" file of the
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * Clara, CA 95054 USA or visit http://www.sun.com if you need
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * additional information or have any questions.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync/*******************************************************************************
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync* Header Files *
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync*******************************************************************************/
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * Validates the GSO context.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @returns true if valid, false if not (not asserted or logged).
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @param pGso The GSO context.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @param cbGsoMax The max size of the GSO context.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @param cbFrame The max size of the GSO frame (use to validate
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * the MSS).
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsyncDECLINLINE(bool) PDMNetGsoIsValid(PCPDMNETWORKGSO pGso, size_t cbGsoMax, size_t cbFrame)
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync return false;
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync PDMNETWORKGSOTYPE const enmType = (PDMNETWORKGSOTYPE)pGso->u8Type;
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync if (RT_UNLIKELY(enmType <= PDMNETWORKGSOTYPE_INVALID || enmType >= PDMNETWORKGSOTYPE_END))
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync return false;
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync /* all types requires both headers. */
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync if (RT_UNLIKELY(pGso->offHdr1 < sizeof(RTNETETHERHDR)))
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync return false;
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync if (RT_UNLIKELY(pGso->offHdr2 < sizeof(RTNETETHERHDR)))
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync return false;
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync if (RT_UNLIKELY(pGso->offHdr2 < (unsigned)pGso->offHdr1 + pGso->cbHdr1))
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync return false;
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync if (RT_UNLIKELY(pGso->cbHdrs < (unsigned)pGso->offHdr2 + pGso->cbHdr2))
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync return false;
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync /* min size of the 1st header(s). */
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync if (RT_UNLIKELY(pGso->cbHdr1 < sizeof(RTNETIPV4_MIN_LEN)))
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync return false;
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync if (RT_UNLIKELY(pGso->cbHdr1 < sizeof(RTNETIPV4_MIN_LEN)))
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync return false;
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync if (RT_UNLIKELY(pGso->offHdr1 + pGso->cbHdr1 + RTNETIPV6_MIN_LEN > pGso->offHdr2))
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync return false;
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync if (RT_UNLIKELY(pGso->cbHdr1 < sizeof(RTNETIPV6_MIN_LEN)))
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync return false;
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync /* no default case! want gcc warnings. */
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync /* min size of the 2nd header. */
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync if (RT_UNLIKELY(pGso->cbHdr2 < sizeof(RTNETTCP_MIN_LEN)))
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync return false;
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync if (RT_UNLIKELY(pGso->cbHdr2 < sizeof(RTNETUDP_MIN_LEN)))
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync return false;
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync /* no default case! want gcc warnings. */
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync /* There must be at more than one segment. */
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync return false;
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync if (RT_UNLIKELY(cbFrame - pGso->cbHdrs < pGso->cbMaxSeg))
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync return false;
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync return true;
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * Calculates the number of segements a GSO frame will be segmented into.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @returns Segment count.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @param pGso The GSO context.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @param cbFrame The GSO frame size (header proto + payload).
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsyncDECLINLINE(uint32_t) PDMNetGsoCalcSegmentCount(PCPDMNETWORKGSO pGso, size_t cbFrame)
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync Assert(PDMNetGsoIsValid(pGso, sizeof(*pGso), cbFrame));
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync return (uint32_t)((cbPayload + pGso->cbMaxSeg - 1) / pGso->cbMaxSeg);
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * Used to find the IPv6 header when handling 4to6 tunneling.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @returns Offset of the IPv6 header.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @param pbSegHdrs The headers / frame start.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @param offIpHdr The offset of the IPv4 header.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsyncDECLINLINE(uint8_t) pgmNetGsoCalcIpv6Offset(uint8_t *pbSegHdrs, uint8_t offIPv4Hdr)
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync PCRTNETIPV4 pIPv4Hdr = (PCRTNETIPV4)&pbSegHdrs[offIPv4Hdr];
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * Update an UDP header after carving out a segment
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @param u32PsudoSum The pseudo checksum.
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync * @param pbSegHdrs Pointer to the header bytes / frame start.
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync * @param offUdpHdr The offset into @a pbSegHdrs of the UDP header.
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync * @param pbPayload Pointer to the payload bytes.
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync * @param cbPayload The amount of payload.
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync * @param cbHdrs The size of all the headers.
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync * @internal
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsyncDECLINLINE(void) pdmNetGsoUpdateUdpHdr(uint32_t u32PsudoSum, uint8_t *pbSegHdrs, uint8_t offUdpHdr,
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync uint8_t const *pbPayload, uint32_t cbPayload, uint8_t cbHdrs)
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync PRTNETUDP pUdpHdr = (PRTNETUDP)&pbSegHdrs[offUdpHdr];
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync pUdpHdr->uh_sum = RTNetUDPChecksum(u32PsudoSum, pUdpHdr);
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * Update a TCP header after carving out a segment.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @param u32PsudoSum The pseudo checksum.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @param pbSegHdrs Pointer to the header bytes / frame start.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @param offTcpHdr The offset into @a pbSegHdrs of the TCP header.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @param pbPayload Pointer to the payload bytes.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @param cbPayload The amount of payload.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @param offPayload The offset into the payload that we're splitting
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * up. We're ASSUMING that the payload follows
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * immediately after the TCP header w/ options.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @param cbHdrs The size of all the headers.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @param fLastSeg Set if this is the last segment.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @internal
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsyncDECLINLINE(void) pdmNetGsoUpdateTcpHdr(uint32_t u32PsudoSum, uint8_t *pbSegHdrs, uint8_t offTcpHdr,
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync uint8_t const *pbPayload, uint32_t cbPayload, uint32_t offPayload, uint8_t cbHdrs, bool fLastSeg)
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync PRTNETTCP pTcpHdr = (PRTNETTCP)&pbSegHdrs[offTcpHdr];
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync pTcpHdr->th_seq = RT_H2N_U32(RT_N2H_U32(pTcpHdr->th_seq) + offPayload);
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync pTcpHdr->th_flags &= ~(RTNETTCP_F_FIN | RTNETTCP_F_PSH);
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync pTcpHdr->th_sum = RTNetTCPChecksum(u32PsudoSum, pTcpHdr, pbPayload, cbPayload);
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * Updates a IPv6 header after carving out a segment.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @returns 32-bit intermediary checksum value for the pseudo header.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @param pbSegHdrs Pointer to the header bytes.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @param offIpHdr The offset into @a pbSegHdrs of the IP header.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @param cbSegPayload The amount of segmented payload. Not to be
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * confused with the IP payload.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @param cbHdrs The size of all the headers.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @param offPktHdr Offset of the protocol packet header. For the
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * pseudo header checksum calulation.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @param bProtocol The protocol type. For the pseudo header.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @internal
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsyncDECLINLINE(uint32_t) pdmNetGsoUpdateIPv6Hdr(uint8_t *pbSegHdrs, uint8_t offIpHdr, uint32_t cbSegPayload, uint8_t cbHdrs,
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync PRTNETIPV6 pIpHdr = (PRTNETIPV6)&pbSegHdrs[offIpHdr];
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync uint32_t cbPayload = cbHdrs - offIpHdr + sizeof(*pIpHdr) + cbSegPayload;
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync return RTNetIPv6PseudoChecksumEx(pIpHdr, bProtocol, cbPayload - (offPktHdr - offPktHdr - sizeof(*pIpHdr)));
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * Updates a IPv4 header after carving out a segment.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @returns 32-bit intermediary checksum value for the pseudo header.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @param pbSegHdrs Pointer to the header bytes.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @param offIpHdr The offset into @a pbSegHdrs of the IP header.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @param cbSegPayload The amount of segmented payload.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @param iSeg The segment index.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @param cbHdrs The size of all the headers.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @internal
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsyncDECLINLINE(uint32_t) pdmNetGsoUpdateIPv4Hdr(uint8_t *pbSegHdrs, uint8_t offIpHdr, uint32_t cbSegPayload,
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync PRTNETIPV4 pIpHdr = (PRTNETIPV4)&pbSegHdrs[offIpHdr];
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync pIpHdr->ip_len = RT_H2N_U16(cbHdrs - offIpHdr + cbSegPayload);
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync pIpHdr->ip_id = RT_H2N_U16(RT_N2H_U16(pIpHdr->ip_id) + iSeg);
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync pIpHdr->ip_sum = RT_H2N_U16(RTNetIPv4HdrChecksum(pIpHdr));
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync * Carves out the specified segment in a destructive manner.
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync * This is for sequentially carving out segments and pushing them along for
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync * processing or sending. To avoid allocating a temporary buffer for
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync * constructing the segment in, we trash the previous frame by putting the
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync * header at the end of it.
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync * @returns Pointer to the segment frame that we've carved out.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @param pGso The GSO context data.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @param pbFrame Pointer to the GSO frame.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @param cbFrame The size of the GSO frame.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @param pbHdrScatch Pointer to a pGso->cbHdrs sized area where we
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync * can save the original header prototypes on the
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * first call (@a iSeg is 0) and retrieve it on
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync * susequent calls. (Just use a 256 bytes
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * buffer to make life easy.)
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync * @param iSeg The segment that we're carving out (0-based).
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync * @param cSegs The number of segments in the GSO frame. Use
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * PDMNetGsoCalcSegmentCount to find this.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @param pcbSegFrame Where to return the size of the returned segment
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsyncDECLINLINE(void *) PDMNetGsoCarveSegmentQD(PCPDMNETWORKGSO pGso, uint8_t *pbFrame, size_t cbFrame, uint8_t *pbHdrScatch,
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync uint32_t iSeg, uint32_t cSegs, uint32_t *pcbSegFrame)
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * Check assumptions.
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync Assert(cSegs == PDMNetGsoCalcSegmentCount(pGso, cbFrame));
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync Assert(PDMNetGsoIsValid(pGso, sizeof(*pGso), cbFrame));
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * Figure out where the payload is and where the header starts before we
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * do the protocol specific carving.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync uint8_t * const pbSegHdrs = pbFrame + pGso->cbMaxSeg * iSeg;
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync uint8_t * const pbSegPayload = pbSegHdrs + pGso->cbHdrs;
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync uint32_t const cbSegPayload = iSeg + 1 != cSegs ? pGso->cbMaxSeg : cbFrame - iSeg * pGso->cbMaxSeg - pGso->cbHdrs;
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync uint32_t const cbSegFrame = cbSegPayload + pGso->cbHdrs;
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * Copy the header and do the protocol specific massaging of it.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv4Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, iSeg, pGso->cbHdrs),
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, iSeg * pGso->cbMaxSeg,
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync pdmNetGsoUpdateUdpHdr(pdmNetGsoUpdateIPv4Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, iSeg, pGso->cbHdrs),
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, pGso->cbHdrs);
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv6Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, pGso->cbHdrs,
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, iSeg * pGso->cbMaxSeg,
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync pdmNetGsoUpdateUdpHdr(pdmNetGsoUpdateIPv6Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, pGso->cbHdrs,
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, pGso->cbHdrs);
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync pdmNetGsoUpdateIPv4Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, iSeg, pGso->cbHdrs);
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv6Hdr(pbSegHdrs, pgmNetGsoCalcIpv6Offset(pbSegHdrs, pGso->offHdr1),
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync cbSegPayload, pGso->cbHdrs, pGso->cbHdr2, RTNETIPV4_PROT_TCP),
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, iSeg * pGso->cbMaxSeg,
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync pdmNetGsoUpdateIPv4Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, iSeg, pGso->cbHdrs);
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync pdmNetGsoUpdateUdpHdr(pdmNetGsoUpdateIPv6Hdr(pbSegHdrs, pgmNetGsoCalcIpv6Offset(pbSegHdrs, pGso->offHdr1),
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync cbSegPayload, pGso->cbHdrs, pGso->cbHdr2, RTNETIPV4_PROT_UDP),
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, pGso->cbHdrs);
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync /* no default! wnat gcc warnings. */
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * Carves out the specified segment in a non-destructive manner.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * The segment headers and segment payload is kept separate here. The GSO frame
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * is still expected to be one linear chunk of data, but we don't modify any of
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync * @returns The offset into the GSO frame of the payload.
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync * @param pGso The GSO context data.
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync * @param pbFrame Pointer to the GSO frame. Used for retriving
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync * the header prototype and for checksumming the
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync * payload. The buffer is not modified.
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync * @param cbFrame The size of the GSO frame.
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync * @param iSeg The segment that we're carving out (0-based).
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync * @param cSegs The number of segments in the GSO frame. Use
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync * PDMNetGsoCalcSegmentCount to find this.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @param pbSegHdrs Where to return the headers for the segment
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * that's been carved out. The buffer must be at
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * least pGso->cbHdrs in size, using a 256 byte
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * buffer is a recommended simplification.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * @param pcbSegPayload Where to return the size of the returned
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync * segment payload.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsyncDECLINLINE(uint32_t) PDMNetGsoCarveSegment(PCPDMNETWORKGSO pGso, const uint8_t *pbFrame, size_t cbFrame,
5bbb9454328dfeedc25e69918425996f1f8eae60vboxsync uint32_t iSeg, uint32_t cSegs, uint8_t *pbSegHdrs, uint32_t *pcbSegPayload)
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * Check assumptions.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync Assert(cSegs == PDMNetGsoCalcSegmentCount(pGso, cbFrame));
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync Assert(PDMNetGsoIsValid(pGso, sizeof(*pGso), cbFrame));
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * Figure out where the payload is and where the header starts before we
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync * do the protocol specific carving.
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync uint8_t const * const pbSegPayload = pbFrame + pGso->cbHdrs + iSeg * pGso->cbMaxSeg;
cf22150eaeeb72431bf1cf65c309a431454fb22bvboxsync uint32_t const cbSegPayload = iSeg + 1 != cSegs ? pGso->cbMaxSeg : cbFrame - iSeg * pGso->cbMaxSeg - pGso->cbHdrs;
pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv4Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, iSeg, pGso->cbHdrs),
pdmNetGsoUpdateUdpHdr(pdmNetGsoUpdateIPv4Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, iSeg, pGso->cbHdrs),
pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv6Hdr(pbSegHdrs, pgmNetGsoCalcIpv6Offset(pbSegHdrs, pGso->offHdr1),
pdmNetGsoUpdateUdpHdr(pdmNetGsoUpdateIPv6Hdr(pbSegHdrs, pgmNetGsoCalcIpv6Offset(pbSegHdrs, pGso->offHdr1),
case PDMNETWORKGSOTYPE_END: