net/proto-socket.c

   1 #include <stdlib.h>
   2 #include <linux/filter.h>
   3 #include "net.h"
   4 #include "maps.h"       // page_rand
   5 #include "compat.h"
   6 #include "utils.h"      // ARRAY_SIZE
   7
   8 #define NR_SOL_SOCKET_OPTS ARRAY_SIZE(socket_opts)
   9 static const unsigned int socket_opts[] = { SO_DEBUG, SO_REUSEADDR, SO_TYPE, SO_ERROR,
  10         SO_DONTROUTE, SO_BROADCAST, SO_SNDBUF, SO_RCVBUF,
  11         SO_SNDBUFFORCE, SO_RCVBUFFORCE, SO_KEEPALIVE, SO_OOBINLINE,
  12         SO_NO_CHECK, SO_PRIORITY, SO_LINGER, SO_BSDCOMPAT,
  13         SO_REUSEPORT, SO_PASSCRED, SO_PEERCRED, SO_RCVLOWAT, SO_SNDLOWAT,
  14         SO_RCVTIMEO, SO_SNDTIMEO, SO_SECURITY_AUTHENTICATION, SO_SECURITY_ENCRYPTION_TRANSPORT,
  15         SO_SECURITY_ENCRYPTION_NETWORK, SO_BINDTODEVICE, SO_ATTACH_FILTER, SO_DETACH_FILTER,
  16         SO_PEERNAME, SO_TIMESTAMP, SO_ACCEPTCONN, SO_PEERSEC,
  17         SO_PASSSEC, SO_TIMESTAMPNS, SO_MARK, SO_TIMESTAMPING,
  18         SO_PROTOCOL, SO_DOMAIN, SO_RXQ_OVFL, SO_WIFI_STATUS,
  19         SO_PEEK_OFF, SO_NOFCS, SO_LOCK_FILTER, SO_SELECT_ERR_QUEUE,
  20         SO_BUSY_POLL, SO_MAX_PACING_RATE, SO_BPF_EXTENSIONS };
  21
  22 void socket_setsockopt(struct sockopt *so)
  23 {
  24         unsigned char val;
  25
  26         so->level = SOL_SOCKET;
  27
  28         val = rand() % NR_SOL_SOCKET_OPTS;
  29         so->optname = socket_opts[val];
  30
  31         /* Adjust length according to operation set. */
  32         switch (so->optname) {
  33
  34         case SO_LINGER:
  35                 so->optlen = sizeof(struct linger);
  36                 break;
  37
  38         case SO_RCVTIMEO:
  39         case SO_SNDTIMEO:
  40                 so->optlen = sizeof(struct timeval);
  41                 break;
  42
  43         case SO_ATTACH_FILTER: {
  44                 unsigned long *optval = NULL, optlen = 0;
  45
  46                 bpf_gen_filter(&optval, &optlen);
  47
  48                 so->optval = (unsigned long) optval;
  49                 so->optlen = optlen;
  50                 break;
  51         }
  52         default:
  53                 break;
  54         }
  55 }