/* $NetBSD: in_offload.c,v 1.7 2016/04/26 09:30:01 ozaki-r Exp $ */ /*- * Copyright (c)2005, 2006 YAMAMOTO Takashi, * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include __KERNEL_RCSID(0, "$NetBSD: in_offload.c,v 1.7 2016/04/26 09:30:01 ozaki-r Exp $"); #include #include #include #include #include #include #include #include #include struct ip_tso_output_args { struct ifnet *ifp; const struct sockaddr *sa; struct rtentry *rt; }; static int ip_tso_output_callback(void *, struct mbuf *); static int ip_tso_output_callback(void *vp, struct mbuf *m) { struct ip_tso_output_args *args = vp; struct ifnet *ifp = args->ifp; return ip_if_output(ifp, m, args->sa, args->rt); } int ip_tso_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa, struct rtentry *rt) { struct ip_tso_output_args args; args.ifp = ifp; args.sa = sa; args.rt = rt; return tcp4_segment(m, ip_tso_output_callback, &args); } /* * tcp4_segment: handle M_CSUM_TSOv4 by software. * * => always consume m. * => call output_func with output_arg for each segments. */ int tcp4_segment(struct mbuf *m, int (*output_func)(void *, struct mbuf *), void *output_arg) { int mss; int iphlen; int thlen; int hlen; int len; struct ip *iph; struct tcphdr *th; uint16_t ipid; uint32_t tcpseq; struct mbuf *hdr = NULL; struct mbuf *t; int error = 0; KASSERT((m->m_flags & M_PKTHDR) != 0); KASSERT((m->m_pkthdr.csum_flags & M_CSUM_TSOv4) != 0); m->m_pkthdr.csum_flags = 0; len = m->m_pkthdr.len; KASSERT(len >= sizeof(*iph) + sizeof(*th)); if (m->m_len < sizeof(*iph)) { m = m_pullup(m, sizeof(*iph)); if (m == NULL) { error = ENOMEM; goto quit; } } iph = mtod(m, struct ip *); iphlen = iph->ip_hl * 4; KASSERT(iph->ip_v == IPVERSION); KASSERT(iphlen >= sizeof(*iph)); KASSERT(iph->ip_p == IPPROTO_TCP); ipid = ntohs(iph->ip_id); hlen = iphlen + sizeof(*th); if (m->m_len < hlen) { m = m_pullup(m, hlen); if (m == NULL) { error = ENOMEM; goto quit; } } th = (void *)(mtod(m, char *) + iphlen); tcpseq = ntohl(th->th_seq); thlen = th->th_off * 4; hlen = iphlen + thlen; mss = m->m_pkthdr.segsz; KASSERT(mss != 0); KASSERT(len > hlen); t = m_split(m, hlen, M_NOWAIT); if (t == NULL) { error = ENOMEM; goto quit; } hdr = m; m = t; len -= hlen; KASSERT(len % mss == 0); while (len > 0) { struct mbuf *n; n = m_dup(hdr, 0, hlen, M_NOWAIT); if (n == NULL) { error = ENOMEM; goto quit; } KASSERT(n->m_len == hlen); /* XXX */ t = m_split(m, mss, M_NOWAIT); if (t == NULL) { m_freem(n); error = ENOMEM; goto quit; } m_cat(n, m); m = t; KASSERT(n->m_len >= hlen); /* XXX */ n->m_pkthdr.len = hlen + mss; iph = mtod(n, struct ip *); KASSERT(iph->ip_v == IPVERSION); iph->ip_len = htons(n->m_pkthdr.len); iph->ip_id = htons(ipid); th = (void *)(mtod(n, char *) + iphlen); th->th_seq = htonl(tcpseq); iph->ip_sum = 0; iph->ip_sum = in_cksum(n, iphlen); th->th_sum = 0; th->th_sum = in4_cksum(n, IPPROTO_TCP, iphlen, thlen + mss); error = (*output_func)(output_arg, n); if (error) { goto quit; } tcpseq += mss; ipid++; len -= mss; } quit: if (hdr != NULL) { m_freem(hdr); } if (m != NULL) { m_freem(m); } return error; } void ip_undefer_csum(struct mbuf *m, size_t hdrlen, int csum_flags) { const size_t iphdrlen = M_CSUM_DATA_IPv4_IPHL(m->m_pkthdr.csum_data); uint16_t csum; uint16_t ip_len; uint16_t *csump; KASSERT(m->m_flags & M_PKTHDR); KASSERT((m->m_pkthdr.csum_flags & csum_flags) == csum_flags); if (__predict_true(hdrlen + sizeof(struct ip) <= m->m_len)) { struct ip *ip = (struct ip *)(mtod(m, uint8_t *) + hdrlen); ip_len = ip->ip_len; csump = &ip->ip_sum; } else { const size_t ip_len_offset = hdrlen + offsetof(struct ip, ip_len); m_copydata(m, ip_len_offset, sizeof(ip_len), &ip_len); csump = NULL; } ip_len = ntohs(ip_len); if (csum_flags & M_CSUM_IPv4) { csum = in4_cksum(m, 0, hdrlen, iphdrlen); if (csump != NULL) { *csump = csum; } else { const size_t offset = hdrlen + offsetof(struct ip, ip_sum); m_copyback(m, offset, sizeof(uint16_t), &csum); } } if (csum_flags & (M_CSUM_UDPv4|M_CSUM_TCPv4)) { size_t l4offset = hdrlen + iphdrlen; csum = in4_cksum(m, 0, l4offset, ip_len - l4offset - hdrlen); if (csum == 0 && (csum_flags & M_CSUM_UDPv4) != 0) csum = 0xffff; l4offset += M_CSUM_DATA_IPv4_OFFSET(m->m_pkthdr.csum_data); if (__predict_true(l4offset + sizeof(uint16_t) <= m->m_len)) { *(uint16_t *)(mtod(m, char *) + l4offset) = csum; } else { m_copyback(m, l4offset, sizeof(csum), (void *) &csum); } } m->m_pkthdr.csum_flags ^= csum_flags; }