/** @file * PDM - Networking Helpers, Inlined Code. (DEV,++) * * This is all inlined because it's too tedious to create 2-3 libraries to * contain it all (same bad excuse as for intnetinline.h). */ /* * Copyright (C) 2010 Oracle Corporation * * This file is part of VirtualBox Open Source Edition (OSE), as * available from http://www.virtualbox.org. This file is free software; * you can redistribute it and/or modify it under the terms of the GNU * General Public License (GPL) as published by the Free Software * Foundation, in version 2 as it comes in the "COPYING" file of the * VirtualBox OSE distribution. VirtualBox OSE is distributed in the * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. * * The contents of this file may alternatively be used under the terms * of the Common Development and Distribution License Version 1.0 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the * VirtualBox OSE distribution, in which case the provisions of the * CDDL are applicable instead of those of the GPL. * * You may elect to license modified versions of this file under the * terms and conditions of either the GPL or the CDDL or both. */ /******************************************************************************* * Header Files * *******************************************************************************/ #include #include #include #include #include #include /** * Checksum type. */ typedef enum PDMNETCSUMTYPE { /** No checksum. */ PDMNETCSUMTYPE_NONE = 0, /** Normal TCP checksum. */ PDMNETCSUMTYPE_COMPLETE, /** Checksum on pseudo header (used with GSO). */ PDMNETCSUMTYPE_PSEUDO, /** The usual 32-bit hack. */ PDMNETCSUMTYPE_32_BIT_HACK = 0x7fffffff } PDMNETCSUMTYPE; /** * Validates the GSO context. * * @returns true if valid, false if not (not asserted or logged). * @param pGso The GSO context. * @param cbGsoMax The max size of the GSO context. * @param cbFrame The max size of the GSO frame (use to validate * the MSS). */ DECLINLINE(bool) PDMNetGsoIsValid(PCPDMNETWORKGSO pGso, size_t cbGsoMax, size_t cbFrame) { PDMNETWORKGSOTYPE enmType; if (RT_UNLIKELY(cbGsoMax < sizeof(*pGso))) return false; enmType = (PDMNETWORKGSOTYPE)pGso->u8Type; if (RT_UNLIKELY( enmType <= PDMNETWORKGSOTYPE_INVALID || enmType >= PDMNETWORKGSOTYPE_END )) return false; /* all types requires both headers. */ if (RT_UNLIKELY( pGso->offHdr1 < sizeof(RTNETETHERHDR) )) return false; if (RT_UNLIKELY( pGso->offHdr2 <= pGso->offHdr1 )) return false; if (RT_UNLIKELY( pGso->cbHdrsTotal <= pGso->offHdr2 )) return false; /* min size of the 1st header(s). */ switch (enmType) { case PDMNETWORKGSOTYPE_IPV4_TCP: case PDMNETWORKGSOTYPE_IPV4_UDP: if (RT_UNLIKELY( (unsigned)pGso->offHdr2 - pGso->offHdr1 < RTNETIPV4_MIN_LEN )) return false; break; case PDMNETWORKGSOTYPE_IPV6_TCP: case PDMNETWORKGSOTYPE_IPV6_UDP: if (RT_UNLIKELY( (unsigned)pGso->offHdr2 - pGso->offHdr1 < RTNETIPV6_MIN_LEN )) return false; break; case PDMNETWORKGSOTYPE_IPV4_IPV6_TCP: case PDMNETWORKGSOTYPE_IPV4_IPV6_UDP: if (RT_UNLIKELY( (unsigned)pGso->offHdr2 - pGso->offHdr1 < RTNETIPV4_MIN_LEN + RTNETIPV6_MIN_LEN )) return false; break; case PDMNETWORKGSOTYPE_INVALID: case PDMNETWORKGSOTYPE_END: break; /* no default case! want gcc warnings. */ } /* min size of the 2nd header. */ switch (enmType) { case PDMNETWORKGSOTYPE_IPV4_TCP: case PDMNETWORKGSOTYPE_IPV6_TCP: case PDMNETWORKGSOTYPE_IPV4_IPV6_TCP: if (RT_UNLIKELY( (unsigned)pGso->cbHdrsTotal - pGso->offHdr2 < RTNETTCP_MIN_LEN )) return false; break; case PDMNETWORKGSOTYPE_IPV4_UDP: case PDMNETWORKGSOTYPE_IPV6_UDP: case PDMNETWORKGSOTYPE_IPV4_IPV6_UDP: if (RT_UNLIKELY( (unsigned)pGso->cbHdrsTotal - pGso->offHdr2 < RTNETUDP_MIN_LEN )) return false; break; case PDMNETWORKGSOTYPE_INVALID: case PDMNETWORKGSOTYPE_END: break; /* no default case! want gcc warnings. */ } /* There must be at more than one segment. */ if (RT_UNLIKELY( cbFrame <= pGso->cbHdrsTotal )) return false; if (RT_UNLIKELY( cbFrame - pGso->cbHdrsTotal < pGso->cbMaxSeg )) return false; return true; } /** * Returns the length of header for a particular segment/fragment. * * We cannot simply treat UDP header as a part of payload because we do not * want to modify the payload but still need to modify the checksum field in * UDP header. So we want to include UDP header when calculating the length * of headers in the first segment getting it copied to a temporary buffer * along with other headers. * * @returns Length of headers (including UDP header for the first fragment). * @param pGso The GSO context. * @param iSeg The segment index. */ DECLINLINE(uint8_t) pdmNetSegHdrLen(PCPDMNETWORKGSO pGso, uint32_t iSeg) { return iSeg ? pGso->cbHdrsSeg : pGso->cbHdrsTotal; } /** * Returns the length of payload for a particular segment/fragment. * * The first segment does not contain UDP header. The size of UDP header is * determined as the difference between the total headers size and the size * used during segmentation. * * @returns Length of payload (including UDP header for the first fragment). * @param pGso The GSO context. * @param iSeg The segment that we're carving out (0-based). * @param cSegs The number of segments in the GSO frame. * @param cbFrame The size of the GSO frame. */ DECLINLINE(uint32_t) pdmNetSegPayloadLen(PCPDMNETWORKGSO pGso, uint32_t iSeg, uint32_t cSegs, uint32_t cbFrame) { if (iSeg + 1 == cSegs) return cbFrame - iSeg * pGso->cbMaxSeg - pdmNetSegHdrLen(pGso, iSeg); else return pGso->cbMaxSeg - (iSeg ? 0 : pGso->cbHdrsTotal - pGso->cbHdrsSeg); } /** * Calculates the number of segments a GSO frame will be segmented into. * * @returns Segment count. * @param pGso The GSO context. * @param cbFrame The GSO frame size (header proto + payload). */ DECLINLINE(uint32_t) PDMNetGsoCalcSegmentCount(PCPDMNETWORKGSO pGso, size_t cbFrame) { size_t cbPayload; Assert(PDMNetGsoIsValid(pGso, sizeof(*pGso), cbFrame)); cbPayload = cbFrame - pGso->cbHdrsSeg; return (uint32_t)((cbPayload + pGso->cbMaxSeg - 1) / pGso->cbMaxSeg); } /** * Used to find the IPv6 header when handling 4to6 tunneling. * * @returns Offset of the IPv6 header. * @param pbSegHdrs The headers / frame start. * @param offIpHdr The offset of the IPv4 header. */ DECLINLINE(uint8_t) pgmNetGsoCalcIpv6Offset(uint8_t *pbSegHdrs, uint8_t offIPv4Hdr) { PCRTNETIPV4 pIPv4Hdr = (PCRTNETIPV4)&pbSegHdrs[offIPv4Hdr]; return offIPv4Hdr + pIPv4Hdr->ip_hl * 4; } /** * Update an UDP header after carving out a segment * * @param u32PseudoSum The pseudo checksum. * @param pbSegHdrs Pointer to the header bytes / frame start. * @param offUdpHdr The offset into @a pbSegHdrs of the UDP header. * @param pbPayload Pointer to the payload bytes. * @param cbPayload The amount of payload. * @param cbHdrs The size of all the headers. * @param enmCsumType Whether to checksum the payload, the pseudo * header or nothing. * @internal */ DECLINLINE(void) pdmNetGsoUpdateUdpHdr(uint32_t u32PseudoSum, uint8_t *pbSegHdrs, uint8_t offUdpHdr, uint8_t const *pbPayload, uint32_t cbPayload, uint8_t cbHdrs, PDMNETCSUMTYPE enmCsumType) { PRTNETUDP pUdpHdr = (PRTNETUDP)&pbSegHdrs[offUdpHdr]; pUdpHdr->uh_ulen = RT_H2N_U16(cbPayload + cbHdrs - offUdpHdr); switch (enmCsumType) { case PDMNETCSUMTYPE_NONE: pUdpHdr->uh_sum = 0; break; case PDMNETCSUMTYPE_COMPLETE: pUdpHdr->uh_sum = RTNetUDPChecksum(u32PseudoSum, pUdpHdr); break; case PDMNETCSUMTYPE_PSEUDO: pUdpHdr->uh_sum = ~RTNetIPv4FinalizeChecksum(u32PseudoSum); break; default: AssertFailed(); break; } } /** * Update an UDP header after carving out an IP fragment * * @param u32PseudoSum The pseudo checksum. * @param pbSegHdrs Pointer to the header bytes copy * @param pbFrame Pointer to the frame start. * @param offUdpHdr The offset into @a pbSegHdrs of the UDP header. * * @internal */ DECLINLINE(void) pdmNetGsoUpdateUdpHdrUfo(uint32_t u32PseudoSum, uint8_t *pbSegHdrs, const uint8_t *pbFrame, uint8_t offUdpHdr) { PCRTNETUDP pcUdpHdrOrig = (PCRTNETUDP)&pbFrame[offUdpHdr]; PRTNETUDP pUdpHdr = (PRTNETUDP)&pbSegHdrs[offUdpHdr]; pUdpHdr->uh_sum = RTNetUDPChecksum(u32PseudoSum, pcUdpHdrOrig); } /** * Update a TCP header after carving out a segment. * * @param u32PseudoSum The pseudo checksum. * @param pbSegHdrs Pointer to the header bytes / frame start. * @param offTcpHdr The offset into @a pbSegHdrs of the TCP header. * @param pbPayload Pointer to the payload bytes. * @param cbPayload The amount of payload. * @param offPayload The offset into the payload that we're splitting * up. We're ASSUMING that the payload follows * immediately after the TCP header w/ options. * @param cbHdrs The size of all the headers. * @param fLastSeg Set if this is the last segment. * @param enmCsumType Whether to checksum the payload, the pseudo * header or nothing. * @internal */ DECLINLINE(void) pdmNetGsoUpdateTcpHdr(uint32_t u32PseudoSum, uint8_t *pbSegHdrs, uint8_t offTcpHdr, uint8_t const *pbPayload, uint32_t cbPayload, uint32_t offPayload, uint8_t cbHdrs, bool fLastSeg, PDMNETCSUMTYPE enmCsumType) { PRTNETTCP pTcpHdr = (PRTNETTCP)&pbSegHdrs[offTcpHdr]; pTcpHdr->th_seq = RT_H2N_U32(RT_N2H_U32(pTcpHdr->th_seq) + offPayload); if (!fLastSeg) pTcpHdr->th_flags &= ~(RTNETTCP_F_FIN | RTNETTCP_F_PSH); switch (enmCsumType) { case PDMNETCSUMTYPE_NONE: pTcpHdr->th_sum = 0; break; case PDMNETCSUMTYPE_COMPLETE: pTcpHdr->th_sum = RTNetTCPChecksum(u32PseudoSum, pTcpHdr, pbPayload, cbPayload); break; case PDMNETCSUMTYPE_PSEUDO: pTcpHdr->th_sum = ~RTNetIPv4FinalizeChecksum(u32PseudoSum); break; default: AssertFailed(); break; } } /** * Updates a IPv6 header after carving out a segment. * * @returns 32-bit intermediary checksum value for the pseudo header. * @param pbSegHdrs Pointer to the header bytes. * @param offIpHdr The offset into @a pbSegHdrs of the IP header. * @param cbSegPayload The amount of segmented payload. Not to be * confused with the IP payload. * @param cbHdrs The size of all the headers. * @param offPktHdr Offset of the protocol packet header. For the * pseudo header checksum calulation. * @param bProtocol The protocol type. For the pseudo header. * @internal */ DECLINLINE(uint32_t) pdmNetGsoUpdateIPv6Hdr(uint8_t *pbSegHdrs, uint8_t offIpHdr, uint32_t cbSegPayload, uint8_t cbHdrs, uint8_t offPktHdr, uint8_t bProtocol) { PRTNETIPV6 pIpHdr = (PRTNETIPV6)&pbSegHdrs[offIpHdr]; uint16_t cbPayload = (uint16_t)(cbHdrs - (offIpHdr + sizeof(RTNETIPV6)) + cbSegPayload); pIpHdr->ip6_plen = RT_H2N_U16(cbPayload); return RTNetIPv6PseudoChecksumEx(pIpHdr, bProtocol, (uint16_t)(cbHdrs - offPktHdr + cbSegPayload)); } /** * Updates a IPv4 header after carving out a segment. * * @returns 32-bit intermediary checksum value for the pseudo header. * @param pbSegHdrs Pointer to the header bytes. * @param offIpHdr The offset into @a pbSegHdrs of the IP header. * @param cbSegPayload The amount of segmented payload. * @param iSeg The segment index. * @param cbHdrs The size of all the headers. * @internal */ DECLINLINE(uint32_t) pdmNetGsoUpdateIPv4Hdr(uint8_t *pbSegHdrs, uint8_t offIpHdr, uint32_t cbSegPayload, uint32_t iSeg, uint8_t cbHdrs) { PRTNETIPV4 pIpHdr = (PRTNETIPV4)&pbSegHdrs[offIpHdr]; pIpHdr->ip_len = RT_H2N_U16(cbHdrs - offIpHdr + cbSegPayload); pIpHdr->ip_id = RT_H2N_U16(RT_N2H_U16(pIpHdr->ip_id) + iSeg); pIpHdr->ip_sum = RTNetIPv4HdrChecksum(pIpHdr); return RTNetIPv4PseudoChecksum(pIpHdr); } /** * Updates a IPv4 header after carving out an IP fragment. * * @param pbSegHdrs Pointer to the header bytes. * @param offIpHdr The offset into @a pbSegHdrs of the IP header. * @param cbSegPayload The amount of segmented payload. * @param offFragment The offset of this fragment for reassembly. * @param iSeg The segment index. * @param cbHdrs The size of all the headers. * @param fLastFragment True if this is the last fragment of datagram. * @internal */ DECLINLINE(void) pdmNetGsoUpdateIPv4HdrUfo(uint8_t *pbSegHdrs, uint8_t offIpHdr, uint32_t cbSegPayload, uint32_t offFragment, uint8_t cbHdrs, bool fLastFragment) { PRTNETIPV4 pIpHdr = (PRTNETIPV4)&pbSegHdrs[offIpHdr]; pIpHdr->ip_len = RT_H2N_U16(cbHdrs - offIpHdr + cbSegPayload); pIpHdr->ip_off = RT_H2N_U16((offFragment / 8) | (fLastFragment ? 0 : RTNETIPV4_FLAGS_MF)); pIpHdr->ip_sum = RTNetIPv4HdrChecksum(pIpHdr); } /** * Carves out the specified segment in a destructive manner. * * This is for sequentially carving out segments and pushing them along for * processing or sending. To avoid allocating a temporary buffer for * constructing the segment in, we trash the previous frame by putting the * header at the end of it. * * @returns Pointer to the segment frame that we've carved out. * @param pGso The GSO context data. * @param pbFrame Pointer to the GSO frame. * @param cbFrame The size of the GSO frame. * @param pbHdrScatch Pointer to a pGso->cbHdrs sized area where we * can save the original header prototypes on the * first call (@a iSeg is 0) and retrieve it on * susequent calls. (Just use a 256 bytes * buffer to make life easy.) * @param iSeg The segment that we're carving out (0-based). * @param cSegs The number of segments in the GSO frame. Use * PDMNetGsoCalcSegmentCount to find this. * @param pcbSegFrame Where to return the size of the returned segment * frame. */ DECLINLINE(void *) PDMNetGsoCarveSegmentQD(PCPDMNETWORKGSO pGso, uint8_t *pbFrame, size_t cbFrame, uint8_t *pbHdrScatch, uint32_t iSeg, uint32_t cSegs, uint32_t *pcbSegFrame) { /* * Figure out where the payload is and where the header starts before we * do the protocol specific carving. */ uint8_t * const pbSegHdrs = pbFrame + pGso->cbMaxSeg * iSeg; uint8_t * const pbSegPayload = pbSegHdrs + pGso->cbHdrsSeg; uint32_t const cbSegPayload = pdmNetSegPayloadLen(pGso, iSeg, cSegs, (uint32_t)cbFrame); uint32_t const cbSegFrame = cbSegPayload + pGso->cbHdrsSeg; /* * Check assumptions (doing it after declaring the variables because of C). */ Assert(iSeg < cSegs); Assert(cSegs == PDMNetGsoCalcSegmentCount(pGso, cbFrame)); Assert(PDMNetGsoIsValid(pGso, sizeof(*pGso), cbFrame)); /* * Copy the header and do the protocol specific massaging of it. */ if (iSeg != 0) memcpy(pbSegHdrs, pbHdrScatch, pGso->cbHdrsSeg); else memcpy(pbHdrScatch, pbSegHdrs, pGso->cbHdrsSeg); /* There is no need to save UDP header */ switch ((PDMNETWORKGSOTYPE)pGso->u8Type) { case PDMNETWORKGSOTYPE_IPV4_TCP: pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv4Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, iSeg, pGso->cbHdrsSeg), pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, iSeg * pGso->cbMaxSeg, pGso->cbHdrsSeg, iSeg + 1 == cSegs, PDMNETCSUMTYPE_COMPLETE); break; case PDMNETWORKGSOTYPE_IPV4_UDP: if (iSeg == 0) pdmNetGsoUpdateUdpHdrUfo(RTNetIPv4PseudoChecksum((PRTNETIPV4)&pbFrame[pGso->offHdr1]), pbSegHdrs, pbFrame, pGso->offHdr2); pdmNetGsoUpdateIPv4HdrUfo(pbSegHdrs, pGso->offHdr1, cbSegPayload, iSeg * pGso->cbMaxSeg, pdmNetSegHdrLen(pGso, iSeg), iSeg + 1 == cSegs); break; case PDMNETWORKGSOTYPE_IPV6_TCP: pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv6Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, pGso->cbHdrsSeg, pGso->offHdr2, RTNETIPV4_PROT_TCP), pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, iSeg * pGso->cbMaxSeg, pGso->cbHdrsSeg, iSeg + 1 == cSegs, PDMNETCSUMTYPE_COMPLETE); break; case PDMNETWORKGSOTYPE_IPV6_UDP: pdmNetGsoUpdateUdpHdr(pdmNetGsoUpdateIPv6Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, pGso->cbHdrsSeg, pGso->offHdr2, RTNETIPV4_PROT_UDP), pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, pGso->cbHdrsSeg, PDMNETCSUMTYPE_COMPLETE); break; case PDMNETWORKGSOTYPE_IPV4_IPV6_TCP: pdmNetGsoUpdateIPv4Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, iSeg, pGso->cbHdrsSeg); pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv6Hdr(pbSegHdrs, pgmNetGsoCalcIpv6Offset(pbSegHdrs, pGso->offHdr1), cbSegPayload, pGso->cbHdrsSeg, pGso->offHdr2, RTNETIPV4_PROT_TCP), pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, iSeg * pGso->cbMaxSeg, pGso->cbHdrsSeg, iSeg + 1 == cSegs, PDMNETCSUMTYPE_COMPLETE); break; case PDMNETWORKGSOTYPE_IPV4_IPV6_UDP: pdmNetGsoUpdateIPv4Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, iSeg, pGso->cbHdrsSeg); pdmNetGsoUpdateUdpHdr(pdmNetGsoUpdateIPv6Hdr(pbSegHdrs, pgmNetGsoCalcIpv6Offset(pbSegHdrs, pGso->offHdr1), cbSegPayload, pGso->cbHdrsSeg, pGso->offHdr2, RTNETIPV4_PROT_UDP), pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, pGso->cbHdrsSeg, PDMNETCSUMTYPE_COMPLETE); break; case PDMNETWORKGSOTYPE_INVALID: case PDMNETWORKGSOTYPE_END: /* no default! wnat gcc warnings. */ break; } *pcbSegFrame = cbSegFrame; return pbSegHdrs; } /** * Carves out the specified segment in a non-destructive manner. * * The segment headers and segment payload is kept separate here. The GSO frame * is still expected to be one linear chunk of data, but we don't modify any of * it. * * @returns The offset into the GSO frame of the payload. * @param pGso The GSO context data. * @param pbFrame Pointer to the GSO frame. Used for retrieving * the header prototype and for checksumming the * payload. The buffer is not modified. * @param cbFrame The size of the GSO frame. * @param iSeg The segment that we're carving out (0-based). * @param cSegs The number of segments in the GSO frame. Use * PDMNetGsoCalcSegmentCount to find this. * @param pbSegHdrs Where to return the headers for the segment * that's been carved out. The buffer must be at * least pGso->cbHdrs in size, using a 256 byte * buffer is a recommended simplification. * @param pcbSegHdrs Where to return the size of the returned * segment headers. * @param pcbSegPayload Where to return the size of the returned * segment payload. */ DECLINLINE(uint32_t) PDMNetGsoCarveSegment(PCPDMNETWORKGSO pGso, const uint8_t *pbFrame, size_t cbFrame, uint32_t iSeg, uint32_t cSegs, uint8_t *pbSegHdrs, uint32_t *pcbSegHdrs, uint32_t *pcbSegPayload) { /* * Figure out where the payload is and where the header starts before we * do the protocol specific carving. */ uint32_t const cbSegHdrs = pdmNetSegHdrLen(pGso, iSeg); uint8_t const * const pbSegPayload = pbFrame + cbSegHdrs + iSeg * pGso->cbMaxSeg; uint32_t const cbSegPayload = pdmNetSegPayloadLen(pGso, iSeg, cSegs, (uint32_t)cbFrame); /* * Check assumptions (doing it after declaring the variables because of C). */ Assert(iSeg < cSegs); Assert(cSegs == PDMNetGsoCalcSegmentCount(pGso, cbFrame)); Assert(PDMNetGsoIsValid(pGso, sizeof(*pGso), cbFrame)); /* * Copy the header and do the protocol specific massaging of it. */ memcpy(pbSegHdrs, pbFrame, pGso->cbHdrsTotal); /* include UDP header */ switch ((PDMNETWORKGSOTYPE)pGso->u8Type) { case PDMNETWORKGSOTYPE_IPV4_TCP: pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv4Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, iSeg, cbSegHdrs), pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, iSeg * pGso->cbMaxSeg, cbSegHdrs, iSeg + 1 == cSegs, PDMNETCSUMTYPE_COMPLETE); break; case PDMNETWORKGSOTYPE_IPV4_UDP: if (iSeg == 0) pdmNetGsoUpdateUdpHdrUfo(RTNetIPv4PseudoChecksum((PRTNETIPV4)&pbFrame[pGso->offHdr1]), pbSegHdrs, pbFrame, pGso->offHdr2); pdmNetGsoUpdateIPv4HdrUfo(pbSegHdrs, pGso->offHdr1, cbSegPayload, iSeg * pGso->cbMaxSeg, cbSegHdrs, iSeg + 1 == cSegs); break; case PDMNETWORKGSOTYPE_IPV6_TCP: pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv6Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, cbSegHdrs, pGso->offHdr2, RTNETIPV4_PROT_TCP), pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, iSeg * pGso->cbMaxSeg, cbSegHdrs, iSeg + 1 == cSegs, PDMNETCSUMTYPE_COMPLETE); break; case PDMNETWORKGSOTYPE_IPV6_UDP: pdmNetGsoUpdateUdpHdr(pdmNetGsoUpdateIPv6Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, cbSegHdrs, pGso->offHdr2, RTNETIPV4_PROT_UDP), pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, cbSegHdrs, PDMNETCSUMTYPE_COMPLETE); break; case PDMNETWORKGSOTYPE_IPV4_IPV6_TCP: pdmNetGsoUpdateIPv4Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, iSeg, cbSegHdrs); pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv6Hdr(pbSegHdrs, pgmNetGsoCalcIpv6Offset(pbSegHdrs, pGso->offHdr1), cbSegPayload, cbSegHdrs, pGso->offHdr2, RTNETIPV4_PROT_TCP), pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, iSeg * pGso->cbMaxSeg, cbSegHdrs, iSeg + 1 == cSegs, PDMNETCSUMTYPE_COMPLETE); break; case PDMNETWORKGSOTYPE_IPV4_IPV6_UDP: pdmNetGsoUpdateIPv4Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, iSeg, cbSegHdrs); pdmNetGsoUpdateUdpHdr(pdmNetGsoUpdateIPv6Hdr(pbSegHdrs, pgmNetGsoCalcIpv6Offset(pbSegHdrs, pGso->offHdr1), cbSegPayload, cbSegHdrs, pGso->offHdr2, RTNETIPV4_PROT_UDP), pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, cbSegHdrs, PDMNETCSUMTYPE_COMPLETE); break; case PDMNETWORKGSOTYPE_INVALID: case PDMNETWORKGSOTYPE_END: /* no default! wnat gcc warnings. */ break; } *pcbSegHdrs = cbSegHdrs; *pcbSegPayload = cbSegPayload; return cbSegHdrs + iSeg * pGso->cbMaxSeg; } /** * Prepares the GSO frame for direct use without any segmenting. * * @param pGso The GSO context. * @param pvFrame The frame to prepare. * @param cbFrame The frame size. * @param enmCsumType Whether to checksum the payload, the pseudo * header or nothing. */ DECLINLINE(void) PDMNetGsoPrepForDirectUse(PCPDMNETWORKGSO pGso, void *pvFrame, size_t cbFrame, PDMNETCSUMTYPE enmCsumType) { /* * Figure out where the payload is and where the header starts before we * do the protocol bits. */ uint8_t * const pbHdrs = (uint8_t *)pvFrame; uint8_t * const pbPayload = pbHdrs + pGso->cbHdrsTotal; uint32_t const cbFrame32 = (uint32_t)cbFrame; uint32_t const cbPayload = cbFrame32 - pGso->cbHdrsTotal; /* * Check assumptions (doing it after declaring the variables because of C). */ Assert(PDMNetGsoIsValid(pGso, sizeof(*pGso), cbFrame)); /* * Get down to busienss. */ switch ((PDMNETWORKGSOTYPE)pGso->u8Type) { case PDMNETWORKGSOTYPE_IPV4_TCP: pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv4Hdr(pbHdrs, pGso->offHdr1, cbFrame32 - pGso->cbHdrsTotal, 0, pGso->cbHdrsTotal), pbHdrs, pGso->offHdr2, pbPayload, cbPayload, 0, pGso->cbHdrsTotal, true, enmCsumType); break; case PDMNETWORKGSOTYPE_IPV4_UDP: pdmNetGsoUpdateUdpHdr(pdmNetGsoUpdateIPv4Hdr(pbHdrs, pGso->offHdr1, cbFrame32 - pGso->cbHdrsTotal, 0, pGso->cbHdrsTotal), pbHdrs, pGso->offHdr2, pbPayload, cbPayload, pGso->cbHdrsTotal, enmCsumType); break; case PDMNETWORKGSOTYPE_IPV6_TCP: pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv6Hdr(pbHdrs, pGso->offHdr1, cbPayload, pGso->cbHdrsTotal, pGso->offHdr2, RTNETIPV4_PROT_TCP), pbHdrs, pGso->offHdr2, pbPayload, cbPayload, 0, pGso->cbHdrsTotal, true, enmCsumType); break; case PDMNETWORKGSOTYPE_IPV6_UDP: pdmNetGsoUpdateUdpHdr(pdmNetGsoUpdateIPv6Hdr(pbHdrs, pGso->offHdr1, cbPayload, pGso->cbHdrsTotal, pGso->offHdr2, RTNETIPV4_PROT_UDP), pbHdrs, pGso->offHdr2, pbPayload, cbPayload, pGso->cbHdrsTotal, enmCsumType); break; case PDMNETWORKGSOTYPE_IPV4_IPV6_TCP: pdmNetGsoUpdateIPv4Hdr(pbHdrs, pGso->offHdr1, cbPayload, 0, pGso->cbHdrsTotal); pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv6Hdr(pbHdrs, pgmNetGsoCalcIpv6Offset(pbHdrs, pGso->offHdr1), cbPayload, pGso->cbHdrsTotal, pGso->offHdr2, RTNETIPV4_PROT_TCP), pbHdrs, pGso->offHdr2, pbPayload, cbPayload, 0, pGso->cbHdrsTotal, true, enmCsumType); break; case PDMNETWORKGSOTYPE_IPV4_IPV6_UDP: pdmNetGsoUpdateIPv4Hdr(pbHdrs, pGso->offHdr1, cbPayload, 0, pGso->cbHdrsTotal); pdmNetGsoUpdateUdpHdr(pdmNetGsoUpdateIPv6Hdr(pbHdrs, pgmNetGsoCalcIpv6Offset(pbHdrs, pGso->offHdr1), cbPayload, pGso->cbHdrsTotal, pGso->offHdr2, RTNETIPV4_PROT_UDP), pbHdrs, pGso->offHdr2, pbPayload, cbPayload, pGso->cbHdrsTotal, enmCsumType); break; case PDMNETWORKGSOTYPE_INVALID: case PDMNETWORKGSOTYPE_END: /* no default! wnat gcc warnings. */ break; } } /** * Gets the GSO type name string. * * @returns Pointer to read only name string. * @param enmType The type. */ DECLINLINE(const char *) PDMNetGsoTypeName(PDMNETWORKGSOTYPE enmType) { switch (enmType) { case PDMNETWORKGSOTYPE_IPV4_TCP: return "TCPv4"; case PDMNETWORKGSOTYPE_IPV6_TCP: return "TCPv6"; case PDMNETWORKGSOTYPE_IPV4_UDP: return "UDPv4"; case PDMNETWORKGSOTYPE_IPV6_UDP: return "UDPv6"; case PDMNETWORKGSOTYPE_IPV4_IPV6_TCP: return "4to6TCP"; case PDMNETWORKGSOTYPE_IPV4_IPV6_UDP: return "4to6UDP"; case PDMNETWORKGSOTYPE_INVALID: return "invalid"; case PDMNETWORKGSOTYPE_END: return "end"; } return "bad-gso-type"; }