| /* |
| * 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; |
| } |