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


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FreeBSD/Linux Kernel Cross Reference
sys/netinet/in_offload.c

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    1 /*      $NetBSD: in_offload.c,v 1.2 2007/04/24 23:43:50 dyoung Exp $    */
    2 
    3 /*-
    4  * Copyright (c)2005, 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: in_offload.c,v 1.2 2007/04/24 23:43:50 dyoung 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/ip.h>
   40 #include <netinet/tcp.h>
   41 #include <netinet/in_offload.h>
   42 
   43 struct ip_tso_output_args {
   44         struct ifnet *ifp;
   45         const struct sockaddr *sa;
   46         struct rtentry *rt;
   47 };
   48 
   49 static int ip_tso_output_callback(void *, struct mbuf *);
   50 
   51 static int
   52 ip_tso_output_callback(void *vp, struct mbuf *m)
   53 {
   54         struct ip_tso_output_args *args = vp;
   55         struct ifnet *ifp = args->ifp;
   56 
   57         return (*ifp->if_output)(ifp, m, args->sa, args->rt);
   58 }
   59 
   60 int
   61 ip_tso_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa,
   62     struct rtentry *rt)
   63 {
   64         struct ip_tso_output_args args;
   65 
   66         args.ifp = ifp;
   67         args.sa = sa;
   68         args.rt = rt;
   69 
   70         return tcp4_segment(m, ip_tso_output_callback, &args);
   71 }
   72 
   73 /*
   74  * tcp4_segment: handle M_CSUM_TSOv4 by software.
   75  *
   76  * => always consume m.
   77  * => call output_func with output_arg for each segments.
   78  */
   79 
   80 int
   81 tcp4_segment(struct mbuf *m, int (*output_func)(void *, struct mbuf *),
   82     void *output_arg)
   83 {
   84         int mss;
   85         int iphlen;
   86         int thlen;
   87         int hlen;
   88         int len;
   89         struct ip *iph;
   90         struct tcphdr *th;
   91         uint16_t ipid;
   92         uint32_t tcpseq;
   93         struct mbuf *hdr = NULL;
   94         struct mbuf *t;
   95         int error = 0;
   96 
   97         KASSERT((m->m_flags & M_PKTHDR) != 0);
   98         KASSERT((m->m_pkthdr.csum_flags & M_CSUM_TSOv4) != 0);
   99 
  100         m->m_pkthdr.csum_flags = 0;
  101 
  102         len = m->m_pkthdr.len;
  103         KASSERT(len >= sizeof(*iph) + sizeof(*th));
  104 
  105         if (m->m_len < sizeof(*iph)) {
  106                 m = m_pullup(m, sizeof(*iph));
  107                 if (m == NULL) {
  108                         error = ENOMEM;
  109                         goto quit;
  110                 }
  111         }
  112         iph = mtod(m, struct ip *);
  113         iphlen = iph->ip_hl * 4;
  114         KASSERT(iph->ip_v == IPVERSION);
  115         KASSERT(iphlen >= sizeof(*iph));
  116         KASSERT(iph->ip_p == IPPROTO_TCP);
  117         ipid = ntohs(iph->ip_id);
  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 ip *);
  168                 KASSERT(iph->ip_v == IPVERSION);
  169                 iph->ip_len = htons(n->m_pkthdr.len);
  170                 iph->ip_id = htons(ipid);
  171                 th = (void *)(mtod(n, char *) + iphlen);
  172                 th->th_seq = htonl(tcpseq);
  173                 iph->ip_sum = 0;
  174                 iph->ip_sum = in_cksum(n, iphlen);
  175                 th->th_sum = 0;
  176                 th->th_sum = in4_cksum(n, IPPROTO_TCP, iphlen, thlen + mss);
  177 
  178                 error = (*output_func)(output_arg, n);
  179                 if (error) {
  180                         goto quit;
  181                 }
  182 
  183                 tcpseq += mss;
  184                 ipid++;
  185                 len -= mss;
  186         }
  187 
  188 quit:
  189         if (hdr != NULL) {
  190                 m_freem(hdr);
  191         }
  192         if (m != NULL) {
  193                 m_freem(m);
  194         }
  195 
  196         return error;
  197 }

Cache object: ae2a2a111c125b0f64e30f5c6a29a5df


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