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/*
* src/nl-pktloc-lookup.c Lookup packet location alias
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation version 2.1
* of the License.
*
* Copyright (c) 2010 Thomas Graf <tgraf@suug.ch>
*/
#include <netlink/cli/utils.h>
#include <netlink/route/pktloc.h>
static void print_usage(void)
{
printf(
"Usage: nl-pktloc-lookup [OPTIONS] <name>\n"
"\n"
"OPTIONS\n"
" -h, --help Show this help text.\n"
" -v, --version Show versioning information.\n"
" -l, --list List all packet location definitions.\n"
" --u32=VALUE Print in iproute2's u32 selector style\n"
"\n"
"\n"
"EXAMPLE\n"
" $ nl-pktloc-lookup ip.dst\n"
" $ nl-pktloc-lookup --list\n"
"\n"
);
exit(0);
}
static const char *align_txt[] = {
[TCF_EM_ALIGN_U8] = "u8",
[TCF_EM_ALIGN_U16] = "u16",
[TCF_EM_ALIGN_U32] = "u32"
};
static uint32_t align_mask[] = {
[TCF_EM_ALIGN_U8] = 0xff,
[TCF_EM_ALIGN_U16] = 0xffff,
[TCF_EM_ALIGN_U32] = 0xffffffff,
};
static const char *layer_txt[] = {
[TCF_LAYER_LINK] = "eth",
[TCF_LAYER_NETWORK] = "ip",
[TCF_LAYER_TRANSPORT] = "tcp"
};
static void dump_u32_style(struct rtnl_pktloc *loc, uint32_t value)
{
if (loc->align > 4)
nl_cli_fatal(EINVAL, "u32 only supports alignments u8|u16|u32.");
if (loc->layer == TCF_LAYER_LINK)
nl_cli_fatal(EINVAL, "u32 does not support link "
"layer locations.");
if (loc->shift > 0)
nl_cli_fatal(EINVAL, "u32 does not support shifting.");
printf("%s %x %x at %s%u\n",
align_txt[loc->align],
value, loc->mask ? loc->mask : align_mask[loc->align],
loc->layer == TCF_LAYER_TRANSPORT ? "nexthdr+" : "",
loc->offset);
}
static char *get_align_txt(struct rtnl_pktloc *loc)
{
static char buf[16];
if (loc->align <= 4)
strcpy(buf, align_txt[loc->align]);
else
snprintf(buf, sizeof(buf), "%u", loc->align);
return buf;
}
static void dump_loc(struct rtnl_pktloc *loc)
{
printf("%s = %s at %s+%u & %#x >> %u\n",
loc->name, get_align_txt(loc), layer_txt[loc->layer],
loc->offset, loc->mask, loc->shift);
}
static void list_cb(struct rtnl_pktloc *loc, void *arg)
{
printf("%-26s %-5s %3s+%-4u %#-10x %-8u %u\n",
loc->name, get_align_txt(loc), layer_txt[loc->layer],
loc->offset, loc->mask, loc->shift, loc->refcnt);
}
static void do_list(void)
{
printf(
"name align offset mask shift refcnt\n");
printf("---------------------------------------------------------\n");
rtnl_pktloc_foreach(&list_cb, NULL);
}
int main(int argc, char *argv[])
{
struct rtnl_pktloc *loc;
int err, ustyle = 0;
uint32_t uvalue = 0;
for (;;) {
int c, optidx = 0;
enum {
ARG_U32 = 257,
};
static struct option long_opts[] = {
{ "help", 0, 0, 'h' },
{ "version", 0, 0, 'v' },
{ "list", 0, 0, 'l' },
{ "u32", 1, 0, ARG_U32 },
{ 0, 0, 0, 0 }
};
c = getopt_long(argc, argv, "hvl", long_opts, &optidx);
if (c == -1)
break;
switch (c) {
case 'h': print_usage(); break;
case 'v': nl_cli_print_version(); break;
case 'l': do_list(); exit(0);
case ARG_U32:
ustyle = 1;
uvalue = nl_cli_parse_u32(optarg);
break;
}
}
if (optind >= argc)
print_usage();
if ((err = rtnl_pktloc_lookup(argv[optind++], &loc)) < 0)
nl_cli_fatal(err, "Unable to lookup packet location: %s",
nl_geterror(err));
if (ustyle)
dump_u32_style(loc, uvalue);
else
dump_loc(loc);
return 0;
}
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