gpxe/src/net/icmpv6.c

   1 #include <stdint.h>
   2 #include <string.h>
   3 #include <byteswap.h>
   4 #include <errno.h>
   5 #include <gpxe/in.h>
   6 #include <gpxe/ip6.h>
   7 #include <gpxe/if_ether.h>
   8 #include <gpxe/iobuf.h>
   9 #include <gpxe/ndp.h>
  10 #include <gpxe/icmp6.h>
  11 #include <gpxe/tcpip.h>
  12 #include <gpxe/netdevice.h>
  13
  14 struct tcpip_protocol icmp6_protocol;
  15
  16 /**
  17  * Send neighbour solicitation packet
  18  *
  19  * @v netdev    Network device
  20  * @v src       Source address
  21  * @v dest      Destination address
  22  *
  23  * This function prepares a neighbour solicitation packet and sends it to the
  24  * network layer.
  25  */
  26 int icmp6_send_solicit ( struct net_device *netdev, struct in6_addr *src __unused,
  27                          struct in6_addr *dest ) {
  28         union {
  29                 struct sockaddr_in6 sin6;
  30                 struct sockaddr_tcpip st;
  31         } st_dest;
  32         struct ll_protocol *ll_protocol = netdev->ll_protocol;
  33         struct neighbour_solicit *nsolicit;
  34         struct io_buffer *iobuf = alloc_iob ( sizeof ( *nsolicit ) + MIN_IOB_LEN );
  35         iob_reserve ( iobuf, MAX_HDR_LEN );
  36         nsolicit = iob_put ( iobuf, sizeof ( *nsolicit ) );
  37
  38         /* Fill up the headers */
  39         memset ( nsolicit, 0, sizeof ( *nsolicit ) );
  40         nsolicit->type = ICMP6_NSOLICIT;
  41         nsolicit->code = 0;
  42         nsolicit->target = *dest;
  43         nsolicit->opt_type = 1;
  44         nsolicit->opt_len = ( 2 + ll_protocol->ll_addr_len ) / 8;
  45         memcpy ( nsolicit->opt_ll_addr, netdev->ll_addr,
  46                                 netdev->ll_protocol->ll_addr_len );
  47         /* Partial checksum */
  48         nsolicit->csum = 0;
  49         nsolicit->csum = tcpip_chksum ( nsolicit, sizeof ( *nsolicit ) );
  50
  51         /* Solicited multicast address */
  52         st_dest.sin6.sin_family = AF_INET6;
  53         st_dest.sin6.sin6_addr.in6_u.u6_addr8[0] = 0xff;
  54         st_dest.sin6.sin6_addr.in6_u.u6_addr8[2] = 0x02;
  55         st_dest.sin6.sin6_addr.in6_u.u6_addr16[1] = 0x0000;
  56         st_dest.sin6.sin6_addr.in6_u.u6_addr32[1] = 0x00000000;
  57         st_dest.sin6.sin6_addr.in6_u.u6_addr16[4] = 0x0000;
  58         st_dest.sin6.sin6_addr.in6_u.u6_addr16[5] = 0x0001;
  59         st_dest.sin6.sin6_addr.in6_u.u6_addr32[3] = dest->in6_u.u6_addr32[3];
  60         st_dest.sin6.sin6_addr.in6_u.u6_addr8[13] = 0xff;
  61
  62         /* Send packet over IP6 */
  63         return tcpip_tx ( iobuf, &icmp6_protocol, NULL, &st_dest.st,
  64                           NULL, &nsolicit->csum );
  65 }
  66
  67 /**
  68  * Process ICMP6 headers
  69  *
  70  * @v iobuf     I/O buffer
  71  * @v st_src    Source address
  72  * @v st_dest   Destination address
  73  */
  74 static int icmp6_rx ( struct io_buffer *iobuf, struct sockaddr_tcpip *st_src,
  75                       struct sockaddr_tcpip *st_dest, __unused uint16_t pshdr_csum ) {
  76         struct icmp6_header *icmp6hdr = iobuf->data;
  77
  78         /* Sanity check */
  79         if ( iob_len ( iobuf ) < sizeof ( *icmp6hdr ) ) {
  80                 DBG ( "Packet too short (%zd bytes)\n", iob_len ( iobuf ) );
  81                 free_iob ( iobuf );
  82                 return -EINVAL;
  83         }
  84
  85         /* TODO: Verify checksum */
  86
  87         /* Process the ICMP header */
  88         switch ( icmp6hdr->type ) {
  89         case ICMP6_NADVERT:
  90                 return ndp_process_advert ( iobuf, st_src, st_dest );
  91         }
  92         return -ENOSYS;
  93 }
  94
  95 #if 0
  96 void icmp6_test_nadvert (struct net_device *netdev, struct sockaddr_in6 *server_p, char *ll_addr) {
  97
  98                 struct sockaddr_in6 server;
  99                 memcpy ( &server, server_p, sizeof ( server ) );
 100                 struct io_buffer *rxiobuf = alloc_iob ( 500 );
 101                 iob_reserve ( rxiobuf, MAX_HDR_LEN );
 102                 struct neighbour_advert *nadvert = iob_put ( rxiobuf, sizeof ( *nadvert ) );
 103                 nadvert->type = 136;
 104                 nadvert->code = 0;
 105                 nadvert->flags = ICMP6_FLAGS_SOLICITED;
 106                 nadvert->csum = 0xffff;
 107                 nadvert->target = server.sin6_addr;
 108                 nadvert->opt_type = 2;
 109                 nadvert->opt_len = 1;
 110                 memcpy ( nadvert->opt_ll_addr, ll_addr, 6 );
 111                 struct ip6_header *ip6hdr = iob_push ( rxiobuf, sizeof ( *ip6hdr ) );
 112                 ip6hdr->ver_traffic_class_flow_label = htonl ( 0x60000000 );
 113                 ip6hdr->hop_limit = 255;
 114                 ip6hdr->nxt_hdr = 58;
 115                 ip6hdr->payload_len = htons ( sizeof ( *nadvert ) );
 116                 ip6hdr->src = server.sin6_addr;
 117                 ip6hdr->dest = server.sin6_addr;
 118                 hex_dump ( rxiobuf->data, iob_len ( rxiobuf ) );
 119                 net_rx ( rxiobuf, netdev, htons ( ETH_P_IPV6 ), ll_addr );
 120 }
 121 #endif
 122
 123 /** ICMP6 protocol */
 124 struct tcpip_protocol icmp6_protocol __tcpip_protocol = {
 125         .name = "ICMP6",
 126         .rx = icmp6_rx,
 127         .tcpip_proto = IP_ICMP6, // 58
 128 };