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Viewing changes to src/nl-pktloc-lookup.c

  • Committer: Bazaar Package Importer
  • Author(s): Heiko Stuebner
  • Date: 2011-05-21 19:25:13 UTC
  • Revision ID: james.westby@ubuntu.com-20110521192513-1ieyu9w9kym4bt16
Tags: upstream-3.0
Import upstream version 3.0

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src/nl-pktloc-lookup.c
 
1
/*
 
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 * src/nl-pktloc-lookup.c     Lookup packet location alias
 
3
 *
 
4
 *      This library is free software; you can redistribute it and/or
 
5
 *      modify it under the terms of the GNU Lesser General Public
 
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 *      License as published by the Free Software Foundation version 2.1
 
7
 *      of the License.
 
8
 *
 
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 * Copyright (c) 2010 Thomas Graf <tgraf@suug.ch>
 
10
 */
 
11
 
 
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#include <netlink/cli/utils.h>
 
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#include <netlink/route/pktloc.h>
 
14
 
 
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static void print_usage(void)
 
16
{
 
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printf(
 
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"Usage: nl-pktloc-lookup [OPTIONS] <name>\n"
 
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"\n"
 
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"OPTIONS\n"
 
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" -h, --help                Show this help text.\n"
 
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" -v, --version             Show versioning information.\n"
 
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" -l, --list                List all packet location definitions.\n"
 
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"     --u32=VALUE           Print in iproute2's u32 selector style\n"
 
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"\n"
 
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"\n"
 
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"EXAMPLE\n"
 
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"   $ nl-pktloc-lookup ip.dst\n"
 
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"   $ nl-pktloc-lookup --list\n"
 
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"\n"
 
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);
 
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        exit(0);
 
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}
 
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static const char *align_txt[] = {
 
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        [TCF_EM_ALIGN_U8] = "u8",
 
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        [TCF_EM_ALIGN_U16] = "u16",
 
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        [TCF_EM_ALIGN_U32] = "u32"
 
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};
 
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static uint32_t align_mask[] = {
 
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        [TCF_EM_ALIGN_U8] = 0xff,
 
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        [TCF_EM_ALIGN_U16] = 0xffff,
 
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        [TCF_EM_ALIGN_U32] = 0xffffffff,
 
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};
 
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static const char *layer_txt[] = {
 
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        [TCF_LAYER_LINK] = "eth",
 
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        [TCF_LAYER_NETWORK] = "ip",
 
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        [TCF_LAYER_TRANSPORT] = "tcp"
 
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};
 
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static void dump_u32_style(struct rtnl_pktloc *loc, uint32_t value)
 
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{
 
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        if (loc->align > 4)
 
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                nl_cli_fatal(EINVAL, "u32 only supports alignments u8|u16|u32.");
 
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        if (loc->layer == TCF_LAYER_LINK)
 
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                nl_cli_fatal(EINVAL, "u32 does not support link "
 
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                                "layer locations.");
 
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        if (loc->shift > 0)
 
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                nl_cli_fatal(EINVAL, "u32 does not support shifting.");
 
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        printf("%s %x %x at %s%u\n",
 
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                align_txt[loc->align],
 
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                value, loc->mask ? loc->mask : align_mask[loc->align],
 
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                loc->layer == TCF_LAYER_TRANSPORT ? "nexthdr+" : "",
 
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                loc->offset);
 
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}
 
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static char *get_align_txt(struct rtnl_pktloc *loc)
 
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{
 
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        static char buf[16];
 
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        if (loc->align <= 4)
 
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                strcpy(buf, align_txt[loc->align]);
 
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        else
 
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                snprintf(buf, sizeof(buf), "%u", loc->align);
 
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        return buf;
 
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}
 
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static void dump_loc(struct rtnl_pktloc *loc)
 
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{
 
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        printf("%s = %s at %s+%u & %#x >> %u\n",
 
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                loc->name, get_align_txt(loc), layer_txt[loc->layer],
 
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                loc->offset, loc->mask, loc->shift);
 
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}
 
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static void list_cb(struct rtnl_pktloc *loc, void *arg)
 
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{
 
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        printf("%-26s %-5s %3s+%-4u %#-10x %-8u %u\n",
 
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                loc->name, get_align_txt(loc), layer_txt[loc->layer],
 
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                loc->offset, loc->mask, loc->shift, loc->refcnt);
 
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}
 
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static void do_list(void)
 
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{
 
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        printf(
 
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"name                      align  offset  mask     shift    refcnt\n");
 
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        printf("---------------------------------------------------------\n");
 
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        rtnl_pktloc_foreach(&list_cb, NULL);
 
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}
 
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int main(int argc, char *argv[])
 
108
{
 
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        struct rtnl_pktloc *loc;
 
110
        int err, ustyle = 0;
 
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        uint32_t uvalue = 0;
 
112
 
 
113
        for (;;) {
 
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                int c, optidx = 0;
 
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                enum {
 
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                        ARG_U32 = 257,
 
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                };
 
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                static struct option long_opts[] = {
 
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                        { "help", 0, 0, 'h' },
 
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                        { "version", 0, 0, 'v' },
 
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                        { "list", 0, 0, 'l' },
 
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                        { "u32", 1, 0, ARG_U32 },
 
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                        { 0, 0, 0, 0 }
 
124
                };
 
125
        
 
126
                c = getopt_long(argc, argv, "hvl", long_opts, &optidx);
 
127
                if (c == -1)
 
128
                        break;
 
129
 
 
130
                switch (c) {
 
131
                case 'h': print_usage(); break;
 
132
                case 'v': nl_cli_print_version(); break;
 
133
                case 'l': do_list(); exit(0);
 
134
                case ARG_U32:
 
135
                        ustyle = 1;
 
136
                        uvalue = nl_cli_parse_u32(optarg);
 
137
                        break;
 
138
                }
 
139
        }
 
140
 
 
141
        if (optind >= argc)
 
142
                print_usage();
 
143
 
 
144
        if ((err = rtnl_pktloc_lookup(argv[optind++], &loc)) < 0)
 
145
                nl_cli_fatal(err, "Unable to lookup packet location: %s",
 
146
                        nl_geterror(err));
 
147
 
 
148
        if (ustyle)
 
149
                dump_u32_style(loc, uvalue);
 
150
        else
 
151
                dump_loc(loc);
 
152
 
 
153
        return 0;
 
154
}