tests/net/bpf/t_bpf.c

   1 /*      $NetBSD: t_bpf.c,v 1.5 2012/08/14 19:40:30 alnsn Exp $  */
   2
   3 /*-
   4  * Copyright (c) 2010 Antti Kantee.  All Rights Reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
  16  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  18  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  */
  27 #include <sys/cdefs.h>
  28 __RCSID("$NetBSD: t_bpf.c,v 1.5 2012/08/14 19:40:30 alnsn Exp $");
  29
  30 #include <sys/param.h>
  31 #include <sys/ioctl.h>
  32 #include <sys/socket.h>
  33 #include <sys/mbuf.h>
  34 #include <sys/sysctl.h>
  35 #include <sys/mman.h>
  36 #include <unistd.h>
  37
  38 #include <net/if.h>
  39 #include <net/bpf.h>
  40
  41 #include <fcntl.h>
  42 #include <stdio.h>
  43 #include <string.h>
  44
  45 #include <rump/rump.h>
  46 #include <rump/rump_syscalls.h>
  47
  48 /* XXX: atf-c.h has collisions with mbuf */
  49 #undef m_type
  50 #undef m_data
  51 #include <atf-c.h>
  52
  53 #include "../../h_macros.h"
  54 #include "../config/netconfig.c"
  55
  56 ATF_TC(bpfwriteleak);
  57 ATF_TC_HEAD(bpfwriteleak, tc)
  58 {
  59
  60         atf_tc_set_md_var(tc, "descr", "Checks that writing to /dev/bpf "
  61             "does not leak mbufs");
  62 }
  63
  64 static int
  65 getmtdata(void)
  66 {
  67         struct mbstat mbstat;
  68         size_t mbstatlen = sizeof(mbstat);
  69         const int mbstat_mib[] = { CTL_KERN, KERN_MBUF, MBUF_STATS };
  70
  71         RL(rump_sys___sysctl(mbstat_mib, __arraycount(mbstat_mib),
  72             &mbstat, &mbstatlen, NULL, 0));
  73         return mbstat.m_mtypes[MT_DATA];
  74 }
  75
  76 ATF_TC_BODY(bpfwriteleak, tc)
  77 {
  78         char buf[28]; /* sizeof(garbage) > etherhdrlen */
  79         struct ifreq ifr;
  80         int ifnum, bpfd;
  81
  82         RZ(rump_init());
  83         RZ(rump_pub_shmif_create(NULL, &ifnum));
  84         sprintf(ifr.ifr_name, "shmif%d", ifnum);
  85
  86         RL(bpfd = rump_sys_open("/dev/bpf", O_RDWR));
  87         RL(rump_sys_ioctl(bpfd, BIOCSETIF, &ifr));
  88         RL(rump_sys_ioctl(bpfd, BIOCSFEEDBACK, &ifr));
  89
  90         if (getmtdata() != 0)
  91                 atf_tc_fail("test precondition failed: MT_DATA mbufs != 0");
  92
  93         ATF_REQUIRE_ERRNO(ENETDOWN, rump_sys_write(bpfd, buf, sizeof(buf))==-1);
  94
  95         ATF_REQUIRE_EQ(getmtdata(), 0);
  96 }
  97
  98 #if (SIZE_MAX > UINT_MAX)
  99 ATF_TC(bpfwritetrunc);
 100 ATF_TC_HEAD(bpfwritetrunc, tc)
 101 {
 102         atf_tc_set_md_var(tc, "descr", "Checks that write to /dev/bpf "
 103             "does not truncate size_t to int");
 104 }
 105
 106 ATF_TC_BODY(bpfwritetrunc, tc)
 107 {
 108         int bpfd;
 109         struct ifreq ifr;
 110         struct iovec *iov;
 111         size_t iovlen, sz;
 112         const size_t extra_bytes = 28;
 113         const size_t total = extra_bytes + UINT_MAX + 1;
 114         long iov_max, vm_page_size; /* round_page wants vm_page_size variable */
 115
 116         memset(&ifr, 0, sizeof(ifr));
 117
 118         iov_max      = sysconf(_SC_IOV_MAX);
 119         vm_page_size = sysconf(_SC_PAGE_SIZE);
 120         ATF_REQUIRE(iov_max > 1 && vm_page_size > 1);
 121
 122         /*
 123          * Minimize memory consumption by using many iovecs
 124          * all pointing to one memory region.
 125          */
 126         iov = calloc(iov_max, sizeof(struct iovec));
 127         ATF_REQUIRE(iov != NULL);
 128
 129         sz = round_page((total + (iov_max - 1)) / iov_max);
 130
 131         iov[0].iov_len = sz;
 132         iov[0].iov_base = mmap(NULL, sz, PROT_READ, MAP_ANON, -1, 0);
 133         ATF_REQUIRE(iov[0].iov_base != MAP_FAILED);
 134
 135         iovlen = 1;
 136         while (sz + iov[0].iov_len <= total)
 137         {
 138                 iov[iovlen].iov_len  = iov[0].iov_len;
 139                 iov[iovlen].iov_base = iov[0].iov_base;
 140                 sz += iov[0].iov_len;
 141                 iovlen++;
 142         }
 143
 144         if (sz < total)
 145         {
 146                 iov[iovlen].iov_len = total - sz;
 147                 iov[iovlen].iov_base = iov[0].iov_base;
 148                 iovlen++;
 149         }
 150
 151         /* Sanity checks */
 152         ATF_REQUIRE(iovlen >= 1 && iovlen <= (size_t)iov_max);
 153         ATF_REQUIRE_EQ(iov[iovlen-1].iov_len, total % iov[0].iov_len);
 154
 155         RZ(rump_init());
 156         netcfg_rump_makeshmif("bpfwritetrunc", ifr.ifr_name);
 157         netcfg_rump_if(ifr.ifr_name, "10.1.1.1", "255.0.0.0");
 158
 159         RL(bpfd = rump_sys_open("/dev/bpf", O_RDWR));
 160         RL(rump_sys_ioctl(bpfd, BIOCSETIF, &ifr));
 161
 162         ATF_CHECK_ERRNO(EMSGSIZE, rump_sys_writev(bpfd, iov, iovlen) == -1);
 163
 164         munmap(iov[0].iov_base, iov[0].iov_len);
 165         free(iov);
 166 }
 167 #endif /* #if (SIZE_MAX > UINT_MAX) */
 168
 169 ATF_TP_ADD_TCS(tp)
 170 {
 171
 172         ATF_TP_ADD_TC(tp, bpfwriteleak);
 173 #if (SIZE_MAX > UINT_MAX)
 174         ATF_TP_ADD_TC(tp, bpfwritetrunc);
 175 #endif
 176         return atf_no_error();
 177 }