The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

FreeBSD/Linux Kernel Cross Reference
sys/netinet6/in6_offload.c

Version: -  FREEBSD  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-2  -  FREEBSD-11-1  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-4  -  FREEBSD-10-3  -  FREEBSD-10-2  -  FREEBSD-10-1  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-3  -  FREEBSD-9-2  -  FREEBSD-9-1  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-4  -  FREEBSD-8-3  -  FREEBSD-8-2  -  FREEBSD-8-1  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-4  -  FREEBSD-7-3  -  FREEBSD-7-2  -  FREEBSD-7-1  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-4  -  FREEBSD-6-3  -  FREEBSD-6-2  -  FREEBSD-6-1  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-5  -  FREEBSD-5-4  -  FREEBSD-5-3  -  FREEBSD-5-2  -  FREEBSD-5-1  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  linux-2.6  -  linux-2.4.22  -  MK83  -  MK84  -  PLAN9  -  DFBSD  -  NETBSD  -  NETBSD5  -  NETBSD4  -  NETBSD3  -  NETBSD20  -  OPENBSD  -  xnu-517  -  xnu-792  -  xnu-792.6.70  -  xnu-1228  -  xnu-1456.1.26  -  xnu-1699.24.8  -  xnu-2050.18.24  -  OPENSOLARIS  -  minix-3-1-1 
SearchContext: -  none  -  3  -  10 

    1 /*      $NetBSD: in6_offload.c,v 1.1 2006/11/25 18:41:36 yamt Exp $     */
    2 
    3 /*-
    4  * Copyright (c)2006 YAMAMOTO Takashi,
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __KERNEL_RCSID(0, "$NetBSD: in6_offload.c,v 1.1 2006/11/25 18:41:36 yamt Exp $");
   31 
   32 #include <sys/param.h>
   33 #include <sys/mbuf.h>
   34 
   35 #include <net/if.h>
   36 
   37 #include <netinet/in.h>
   38 #include <netinet/in_systm.h>
   39 #include <netinet/ip6.h>
   40 #include <netinet/tcp.h>
   41 #include <netinet6/in6_var.h>
   42 #include <netinet6/nd6.h>
   43 #include <netinet6/in6_offload.h>
   44 
   45 struct ip6_tso_output_args {
   46         struct ifnet *ifp;
   47         struct ifnet *origifp;
   48         struct sockaddr_in6 *dst;
   49         struct rtentry *rt;
   50 };
   51 
   52 static int ip6_tso_output_callback(void *, struct mbuf *);
   53 
   54 static int
   55 ip6_tso_output_callback(void *vp, struct mbuf *m)
   56 {
   57         struct ip6_tso_output_args *args = vp;
   58 
   59         return nd6_output(args->ifp, args->origifp, m, args->dst, args->rt);
   60 }
   61 
   62 int
   63 ip6_tso_output(struct ifnet *ifp, struct ifnet *origifp, struct mbuf *m,
   64     struct sockaddr_in6 *dst, struct rtentry *rt)
   65 {
   66         struct ip6_tso_output_args args;
   67 
   68         args.ifp = ifp;
   69         args.origifp = origifp;
   70         args.dst = dst;
   71         args.rt = rt;
   72 
   73         return tcp6_segment(m, ip6_tso_output_callback, &args);
   74 }
   75 
   76 /*
   77  * tcp6_segment: handle M_CSUM_TSOv6 by software.
   78  *
   79  * => always consume m.
   80  * => call output_func with output_arg for each segments.
   81  */
   82 
   83 int
   84 tcp6_segment(struct mbuf *m, int (*output_func)(void *, struct mbuf *),
   85     void *output_arg)
   86 {
   87         int mss;
   88         int iphlen;
   89         int thlen;
   90         int hlen;
   91         int len;
   92         struct ip6_hdr *iph;
   93         struct tcphdr *th;
   94         uint32_t tcpseq;
   95         struct mbuf *hdr = NULL;
   96         struct mbuf *t;
   97         int error = 0;
   98 
   99         KASSERT((m->m_flags & M_PKTHDR) != 0);
  100         KASSERT((m->m_pkthdr.csum_flags & M_CSUM_TSOv6) != 0);
  101 
  102         m->m_pkthdr.csum_flags = 0;
  103 
  104         len = m->m_pkthdr.len;
  105         KASSERT(len >= sizeof(*iph) + sizeof(*th));
  106 
  107         if (m->m_len < sizeof(*iph)) {
  108                 m = m_pullup(m, sizeof(*iph));
  109                 if (m == NULL) {
  110                         error = ENOMEM;
  111                         goto quit;
  112                 }
  113         }
  114         iph = mtod(m, struct ip6_hdr *);
  115         iphlen = sizeof(*iph);
  116         KASSERT((iph->ip6_vfc & IPV6_VERSION_MASK) == IPV6_VERSION);
  117         KASSERT(iph->ip6_nxt == IPPROTO_TCP);
  118 
  119         hlen = iphlen + sizeof(*th);
  120         if (m->m_len < hlen) {
  121                 m = m_pullup(m, hlen);
  122                 if (m == NULL) {
  123                         error = ENOMEM;
  124                         goto quit;
  125                 }
  126         }
  127         th = (void *)(mtod(m, char *) + iphlen);
  128         tcpseq = ntohl(th->th_seq);
  129         thlen = th->th_off * 4;
  130         hlen = iphlen + thlen;
  131 
  132         mss = m->m_pkthdr.segsz;
  133         KASSERT(mss != 0);
  134         KASSERT(len > hlen);
  135 
  136         t = m_split(m, hlen, M_NOWAIT);
  137         if (t == NULL) {
  138                 error = ENOMEM;
  139                 goto quit;
  140         }
  141         hdr = m;
  142         m = t;
  143         len -= hlen;
  144         KASSERT(len % mss == 0);
  145         while (len > 0) {
  146                 struct mbuf *n;
  147 
  148                 n = m_dup(hdr, 0, hlen, M_NOWAIT);
  149                 if (n == NULL) {
  150                         error = ENOMEM;
  151                         goto quit;
  152                 }
  153                 KASSERT(n->m_len == hlen); /* XXX */
  154 
  155                 t = m_split(m, mss, M_NOWAIT);
  156                 if (t == NULL) {
  157                         m_freem(n);
  158                         error = ENOMEM;
  159                         goto quit;
  160                 }
  161                 m_cat(n, m);
  162                 m = t;
  163 
  164                 KASSERT(n->m_len >= hlen); /* XXX */
  165 
  166                 n->m_pkthdr.len = hlen + mss;
  167                 iph = mtod(n, struct ip6_hdr *);
  168                 KASSERT((iph->ip6_vfc & IPV6_VERSION_MASK) == IPV6_VERSION);
  169                 iph->ip6_plen = htons(thlen + mss);
  170                 th = (void *)(mtod(n, char *) + iphlen);
  171                 th->th_seq = htonl(tcpseq);
  172                 th->th_sum = 0;
  173                 th->th_sum = in6_cksum(n, IPPROTO_TCP, iphlen, thlen + mss);
  174 
  175                 error = (*output_func)(output_arg, n);
  176                 if (error) {
  177                         goto quit;
  178                 }
  179 
  180                 tcpseq += mss;
  181                 len -= mss;
  182         }
  183 
  184 quit:
  185         if (hdr != NULL) {
  186                 m_freem(hdr);
  187         }
  188         if (m != NULL) {
  189                 m_freem(m);
  190         }
  191 
  192         return error;
  193 }

Cache object: 17957e520e9c87b151c0dff3e71530f7


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.