1 /* SPDX-License-Identifier: LGPL-2.1-only */
2 /*
3 * Copyright (c) 2010 Thomas Graf <[email protected]>
4 */
5
6 #include "nl-default.h"
7
8 #include <linux/tc_ematch/tc_em_cmp.h>
9
10 #include <netlink/cli/utils.h>
11 #include <netlink/route/pktloc.h>
12
print_usage(void)13 static void print_usage(void)
14 {
15 printf(
16 "Usage: nl-pktloc-lookup [OPTIONS] <name>\n"
17 "\n"
18 "OPTIONS\n"
19 " -h, --help Show this help text.\n"
20 " -v, --version Show versioning information.\n"
21 " -l, --list List all packet location definitions.\n"
22 " --u32=VALUE Print in iproute2's u32 selector style\n"
23 "\n"
24 "\n"
25 "EXAMPLE\n"
26 " $ nl-pktloc-lookup ip.dst\n"
27 " $ nl-pktloc-lookup --list\n"
28 "\n"
29 );
30 exit(0);
31 }
32
33 static const char *align_txt[] = {
34 [TCF_EM_ALIGN_U8] = "u8",
35 [TCF_EM_ALIGN_U16] = "u16",
36 [TCF_EM_ALIGN_U32] = "u32"
37 };
38
39 static uint32_t align_mask[] = {
40 [TCF_EM_ALIGN_U8] = 0xff,
41 [TCF_EM_ALIGN_U16] = 0xffff,
42 [TCF_EM_ALIGN_U32] = 0xffffffff,
43 };
44
45 static const char *layer_txt[] = {
46 [TCF_LAYER_LINK] = "eth",
47 [TCF_LAYER_NETWORK] = "ip",
48 [TCF_LAYER_TRANSPORT] = "tcp"
49 };
50
get_align_txt(struct rtnl_pktloc * loc,char buf[static16])51 static const char *get_align_txt(struct rtnl_pktloc *loc, char buf[static 16])
52 {
53 if (loc->align < _NL_N_ELEMENTS(align_txt))
54 return align_txt[loc->align];
55
56 snprintf(buf, 16, "%u", loc->align);
57 return buf;
58 }
59
dump_u32_style(struct rtnl_pktloc * loc,uint32_t value)60 static void dump_u32_style(struct rtnl_pktloc *loc, uint32_t value)
61 {
62 char buf[16];
63
64 if (loc->align > 4)
65 nl_cli_fatal(EINVAL, "u32 only supports alignments u8|u16|u32.");
66
67 if (loc->layer == TCF_LAYER_LINK)
68 nl_cli_fatal(EINVAL, "u32 does not support link "
69 "layer locations.");
70
71 if (loc->shift > 0)
72 nl_cli_fatal(EINVAL, "u32 does not support shifting.");
73
74 printf("%s %x %x at %s%u\n", get_align_txt(loc, buf), value,
75 loc->mask ? loc->mask :
76 (loc->align < _NL_N_ELEMENTS(align_mask) ?
77 align_mask[loc->align] :
78 0),
79 loc->layer == TCF_LAYER_TRANSPORT ? "nexthdr+" : "",
80 loc->offset);
81 }
82
dump_loc(struct rtnl_pktloc * loc)83 static void dump_loc(struct rtnl_pktloc *loc)
84 {
85 char buf[16];
86
87 printf("%s = %s at %s+%u & %#x >> %u\n", loc->name,
88 get_align_txt(loc, buf),
89 loc->layer < _NL_N_ELEMENTS(layer_txt) ? layer_txt[loc->layer] :
90 "???",
91 loc->offset, loc->mask, loc->shift);
92 }
93
list_cb(struct rtnl_pktloc * loc,void * arg)94 static void list_cb(struct rtnl_pktloc *loc, void *arg)
95 {
96 char buf[16];
97
98 printf("%-26s %-5s %3s+%-4u %#-10x %-8u %u\n", loc->name,
99 get_align_txt(loc, buf),
100 loc->layer < _NL_N_ELEMENTS(layer_txt) ? layer_txt[loc->layer] :
101 "???",
102 loc->offset, loc->mask, loc->shift, loc->refcnt);
103 }
104
do_list(void)105 static void do_list(void)
106 {
107 printf(
108 "name align offset mask shift refcnt\n");
109 printf("---------------------------------------------------------\n");
110
111 rtnl_pktloc_foreach(&list_cb, NULL);
112 }
113
main(int argc,char * argv[])114 int main(int argc, char *argv[])
115 {
116 struct rtnl_pktloc *loc;
117 int err, ustyle = 0;
118 uint32_t uvalue = 0;
119
120 for (;;) {
121 int c, optidx = 0;
122 enum {
123 ARG_U32 = 257,
124 };
125 static struct option long_opts[] = {
126 { "help", 0, 0, 'h' },
127 { "version", 0, 0, 'v' },
128 { "list", 0, 0, 'l' },
129 { "u32", 1, 0, ARG_U32 },
130 { 0, 0, 0, 0 }
131 };
132
133 c = getopt_long(argc, argv, "hvl", long_opts, &optidx);
134 if (c == -1)
135 break;
136
137 switch (c) {
138 case 'h': print_usage(); break;
139 case 'v': nl_cli_print_version(); break;
140 case 'l': do_list(); exit(0);
141 case ARG_U32:
142 ustyle = 1;
143 uvalue = nl_cli_parse_u32(optarg);
144 break;
145 }
146 }
147
148 if (optind >= argc)
149 print_usage();
150
151 if ((err = rtnl_pktloc_lookup(argv[optind++], &loc)) < 0)
152 nl_cli_fatal(err, "Unable to lookup packet location: %s",
153 nl_geterror(err));
154
155 if (ustyle)
156 dump_u32_style(loc, uvalue);
157 else
158 dump_loc(loc);
159
160 return 0;
161 }
162