linux-user: convert /proc/net/route when endianess differs
This patch allows to have IP addresses in correct order
in the case of "netstat -nr" when the endianess of the
guest differs from one of the host.
For instance, an m68k guest on an x86_64 host:
WITHOUT this patch:
$ netstat -nr
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
0.0.0.0 1.3.0.10 0.0.0.0 UG 0 0 0 eth0
0.3.0.10 0.0.0.0 0.255.255.255 U 0 0 0 eth0
$ cat /proc/net/route
Iface Destination Gateway Flags RefCnt Use Metric Mask MTU Window IRTT
eth0 00000000 0103000A 0003 0 0 0 000000000 0 0
eth0 0003000A 00000000 0001 0 0 0 00FFFFFF0 0 0
WITH this patch:
$ netstat -nr
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
0.0.0.0 10.0.3.1 0.0.0.0 UG 0 0 0 eth0
10.0.3.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
$ cat /proc/net/route
Iface Destination Gateway Flags RefCnt Use Metric Mask MTU Window IRTT
eth0 00000000 0a000301 0003 0 0 0 000000000 0 0
eth0 0a000300 00000000 0001 0 0 0 ffffff000 0 0
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 5c33e44..251c116 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -5071,22 +5071,70 @@
return 0;
}
+#if defined(HOST_WORDS_BIGENDIAN) != defined(TARGET_WORDS_BIGENDIAN)
+static int is_proc(const char *filename, const char *entry)
+{
+ return strcmp(filename, entry) == 0;
+}
+
+static int open_net_route(void *cpu_env, int fd)
+{
+ FILE *fp;
+ char *line = NULL;
+ size_t len = 0;
+ ssize_t read;
+
+ fp = fopen("/proc/net/route", "r");
+ if (fp == NULL) {
+ return -EACCES;
+ }
+
+ /* read header */
+
+ read = getline(&line, &len, fp);
+ dprintf(fd, "%s", line);
+
+ /* read routes */
+
+ while ((read = getline(&line, &len, fp)) != -1) {
+ char iface[16];
+ uint32_t dest, gw, mask;
+ unsigned int flags, refcnt, use, metric, mtu, window, irtt;
+ sscanf(line, "%s\t%08x\t%08x\t%04x\t%d\t%d\t%d\t%08x\t%d\t%u\t%u\n",
+ iface, &dest, &gw, &flags, &refcnt, &use, &metric,
+ &mask, &mtu, &window, &irtt);
+ dprintf(fd, "%s\t%08x\t%08x\t%04x\t%d\t%d\t%d\t%08x\t%d\t%u\t%u\n",
+ iface, tswap32(dest), tswap32(gw), flags, refcnt, use,
+ metric, tswap32(mask), mtu, window, irtt);
+ }
+
+ free(line);
+ fclose(fp);
+
+ return 0;
+}
+#endif
+
static int do_open(void *cpu_env, const char *pathname, int flags, mode_t mode)
{
struct fake_open {
const char *filename;
int (*fill)(void *cpu_env, int fd);
+ int (*cmp)(const char *s1, const char *s2);
};
const struct fake_open *fake_open;
static const struct fake_open fakes[] = {
- { "maps", open_self_maps },
- { "stat", open_self_stat },
- { "auxv", open_self_auxv },
- { NULL, NULL }
+ { "maps", open_self_maps, is_proc_myself },
+ { "stat", open_self_stat, is_proc_myself },
+ { "auxv", open_self_auxv, is_proc_myself },
+#if defined(HOST_WORDS_BIGENDIAN) != defined(TARGET_WORDS_BIGENDIAN)
+ { "/proc/net/route", open_net_route, is_proc },
+#endif
+ { NULL, NULL, NULL }
};
for (fake_open = fakes; fake_open->filename; fake_open++) {
- if (is_proc_myself(pathname, fake_open->filename)) {
+ if (fake_open->cmp(pathname, fake_open->filename)) {
break;
}
}
