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81b365eb50
iproute2/tc/f_u32.c
Jakub Kicinski 9c5f4251d6 tc: f_u32: allow skip_hw and skip_sw flags to be last 
u32 uses NEXT_ARG() incorrectly when parsing skip_hw and skip_sw
flags.  NEXT_ARG() ensures there is another argument on the command
line, and is used in handling <keyword> <value> syntax to move past
<keyword> and ensure there is a <value> to read.

Commit 5e5b3008d1 ("tc: f_u32: Add support for skip_hw and skip_sw
flags") seems to have copy pasted the handling from the previous
command - "police", which needs an extra parameter and is kind of
special due to the use of parse_police() helper.

The combination of NEXT_ARG() and continue worked fine as long as
skip_sw/skip_hw wasn't last, e.g.:

$ tc filter add dev dummy0 ingress prio 101 protocol ipv6 \
    u32 match ip6 priority 0xa0 0xe0 skip_hw action pass

But would fail if it was last:

$ tc filter add dev dummy0 ingress prio 101 protocol ipv6 \
    u32 match ip6 priority 0xa0 0xe0 flowid :1 skip_hw
Command line is not complete. Try option "help"

Remove the NEXT_ARG()s and the continues, and let the argc--; argv++;
at the end of the loop do its job.

Fixes: 5e5b3008d1 ("tc: f_u32: Add support for skip_hw and skip_sw flags")
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
2018-11-09 08:12:29 -08:00

1341 lines
28 KiB
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/*
* q_u32.c U32 filter.
*
* This program is free software; you can u32istribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
* Match mark added by Catalin(ux aka Dino) BOIE <catab at umbrella.ro> [5 nov 2004]
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <linux/if.h>
#include <linux/if_ether.h>
#include "utils.h"
#include "tc_util.h"
static void explain(void)
{
fprintf(stderr,
"Usage: ... u32 [ match SELECTOR ... ] [ link HTID ] [ classid CLASSID ]\n"
" [ action ACTION_SPEC ] [ offset OFFSET_SPEC ]\n"
" [ ht HTID ] [ hashkey HASHKEY_SPEC ]\n"
" [ sample SAMPLE ] [skip_hw | skip_sw]\n"
"or u32 divisor DIVISOR\n"
"\n"
"Where: SELECTOR := SAMPLE SAMPLE ...\n"
" SAMPLE := { ip | ip6 | udp | tcp | icmp | u{32|16|8} | mark }\n"
" SAMPLE_ARGS [ divisor DIVISOR ]\n"
" FILTERID := X:Y:Z\n"
"\nNOTE: CLASSID is parsed at hexadecimal input.\n");
}
static int get_u32_handle(__u32 *handle, const char *str)
{
__u32 htid = 0, hash = 0, nodeid = 0;
char *tmp = strchr(str, ':');
if (tmp == NULL) {
if (memcmp("0x", str, 2) == 0)
return get_u32(handle, str, 16);
return -1;
}
htid = strtoul(str, &tmp, 16);
if (tmp == str && *str != ':' && *str != 0)
return -1;
if (htid >= 0x1000)
return -1;
if (*tmp) {
str = tmp + 1;
hash = strtoul(str, &tmp, 16);
if (tmp == str && *str != ':' && *str != 0)
return -1;
if (hash >= 0x100)
return -1;
if (*tmp) {
str = tmp + 1;
nodeid = strtoul(str, &tmp, 16);
if (tmp == str && *str != 0)
return -1;
if (nodeid >= 0x1000)
return -1;
}
}
*handle = (htid<<20)|(hash<<12)|nodeid;
return 0;
}
static char *sprint_u32_handle(__u32 handle, char *buf)
{
int bsize = SPRINT_BSIZE-1;
__u32 htid = TC_U32_HTID(handle);
__u32 hash = TC_U32_HASH(handle);
__u32 nodeid = TC_U32_NODE(handle);
char *b = buf;
if (handle == 0) {
snprintf(b, bsize, "none");
return b;
}
if (htid) {
int l = snprintf(b, bsize, "%x:", htid>>20);
bsize -= l;
b += l;
}
if (nodeid|hash) {
if (hash) {
int l = snprintf(b, bsize, "%x", hash);
bsize -= l;
b += l;
}
if (nodeid) {
int l = snprintf(b, bsize, ":%x", nodeid);
bsize -= l;
b += l;
}
}
if (show_raw)
snprintf(b, bsize, "[%08x] ", handle);
return buf;
}
static int pack_key(struct tc_u32_sel *sel, __u32 key, __u32 mask,
int off, int offmask)
{
int i;
int hwm = sel->nkeys;
key &= mask;
for (i = 0; i < hwm; i++) {
if (sel->keys[i].off == off && sel->keys[i].offmask == offmask) {
__u32 intersect = mask & sel->keys[i].mask;
if ((key ^ sel->keys[i].val) & intersect)
return -1;
sel->keys[i].val |= key;
sel->keys[i].mask |= mask;
return 0;
}
}
if (hwm >= 128)
return -1;
if (off % 4)
return -1;
sel->keys[hwm].val = key;
sel->keys[hwm].mask = mask;
sel->keys[hwm].off = off;
sel->keys[hwm].offmask = offmask;
sel->nkeys++;
return 0;
}
static int pack_key32(struct tc_u32_sel *sel, __u32 key, __u32 mask,
int off, int offmask)
{
key = htonl(key);
mask = htonl(mask);
return pack_key(sel, key, mask, off, offmask);
}
static int pack_key16(struct tc_u32_sel *sel, __u32 key, __u32 mask,
int off, int offmask)
{
if (key > 0xFFFF || mask > 0xFFFF)
return -1;
if ((off & 3) == 0) {
key <<= 16;
mask <<= 16;
}
off &= ~3;
key = htonl(key);
mask = htonl(mask);
return pack_key(sel, key, mask, off, offmask);
}
static int pack_key8(struct tc_u32_sel *sel, __u32 key, __u32 mask, int off,
int offmask)
{
if (key > 0xFF || mask > 0xFF)
return -1;
if ((off & 3) == 0) {
key <<= 24;
mask <<= 24;
} else if ((off & 3) == 1) {
key <<= 16;
mask <<= 16;
} else if ((off & 3) == 2) {
key <<= 8;
mask <<= 8;
}
off &= ~3;
key = htonl(key);
mask = htonl(mask);
return pack_key(sel, key, mask, off, offmask);
}
static int parse_at(int *argc_p, char ***argv_p, int *off, int *offmask)
{
int argc = *argc_p;
char **argv = *argv_p;
char *p = *argv;
if (argc <= 0)
return -1;
if (strlen(p) > strlen("nexthdr+") &&
memcmp(p, "nexthdr+", strlen("nexthdr+")) == 0) {
*offmask = -1;
p += strlen("nexthdr+");
} else if (matches(*argv, "nexthdr+") == 0) {
NEXT_ARG();
*offmask = -1;
p = *argv;
}
if (get_integer(off, p, 0))
return -1;
argc--; argv++;
*argc_p = argc;
*argv_p = argv;
return 0;
}
static int parse_u32(int *argc_p, char ***argv_p, struct tc_u32_sel *sel,
int off, int offmask)
{
int res = -1;
int argc = *argc_p;
char **argv = *argv_p;
__u32 key;
__u32 mask;
if (argc < 2)
return -1;
if (get_u32(&key, *argv, 0))
return -1;
argc--; argv++;
if (get_u32(&mask, *argv, 16))
return -1;
argc--; argv++;
if (argc > 0 && strcmp(argv[0], "at") == 0) {
NEXT_ARG();
if (parse_at(&argc, &argv, &off, &offmask))
return -1;
}
res = pack_key32(sel, key, mask, off, offmask);
*argc_p = argc;
*argv_p = argv;
return res;
}
static int parse_u16(int *argc_p, char ***argv_p, struct tc_u32_sel *sel,
int off, int offmask)
{
int res = -1;
int argc = *argc_p;
char **argv = *argv_p;
__u32 key;
__u32 mask;
if (argc < 2)
return -1;
if (get_u32(&key, *argv, 0))
return -1;
argc--; argv++;
if (get_u32(&mask, *argv, 16))
return -1;
argc--; argv++;
if (argc > 0 && strcmp(argv[0], "at") == 0) {
NEXT_ARG();
if (parse_at(&argc, &argv, &off, &offmask))
return -1;
}
res = pack_key16(sel, key, mask, off, offmask);
*argc_p = argc;
*argv_p = argv;
return res;
}
static int parse_u8(int *argc_p, char ***argv_p, struct tc_u32_sel *sel,
int off, int offmask)
{
int res = -1;
int argc = *argc_p;
char **argv = *argv_p;
__u32 key;
__u32 mask;
if (argc < 2)
return -1;
if (get_u32(&key, *argv, 0))
return -1;
argc--; argv++;
if (get_u32(&mask, *argv, 16))
return -1;
argc--; argv++;
if (key > 0xFF || mask > 0xFF)
return -1;
if (argc > 0 && strcmp(argv[0], "at") == 0) {
NEXT_ARG();
if (parse_at(&argc, &argv, &off, &offmask))
return -1;
}
res = pack_key8(sel, key, mask, off, offmask);
*argc_p = argc;
*argv_p = argv;
return res;
}
static int parse_ip_addr(int *argc_p, char ***argv_p, struct tc_u32_sel *sel,
int off)
{
int res = -1;
int argc = *argc_p;
char **argv = *argv_p;
inet_prefix addr;
__u32 mask;
int offmask = 0;
if (argc < 1)
return -1;
if (get_prefix_1(&addr, *argv, AF_INET))
return -1;
argc--; argv++;
if (argc > 0 && strcmp(argv[0], "at") == 0) {
NEXT_ARG();
if (parse_at(&argc, &argv, &off, &offmask))
return -1;
}
mask = 0;
if (addr.bitlen)
mask = htonl(0xFFFFFFFF << (32 - addr.bitlen));
if (pack_key(sel, addr.data[0], mask, off, offmask) < 0)
return -1;
res = 0;
*argc_p = argc;
*argv_p = argv;
return res;
}
static int parse_ip6_addr(int *argc_p, char ***argv_p,
struct tc_u32_sel *sel, int off)
{
int res = -1;
int argc = *argc_p;
char **argv = *argv_p;
int plen = 128;
int i;
inet_prefix addr;
int offmask = 0;
if (argc < 1)
return -1;
if (get_prefix_1(&addr, *argv, AF_INET6))
return -1;
argc--; argv++;
if (argc > 0 && strcmp(argv[0], "at") == 0) {
NEXT_ARG();
if (parse_at(&argc, &argv, &off, &offmask))
return -1;
}
plen = addr.bitlen;
for (i = 0; i < plen; i += 32) {
if (i + 31 < plen) {
res = pack_key(sel, addr.data[i / 32],
0xFFFFFFFF, off + 4 * (i / 32), offmask);
if (res < 0)
return -1;
} else if (i < plen) {
__u32 mask = htonl(0xFFFFFFFF << (32 - (plen - i)));
res = pack_key(sel, addr.data[i / 32],
mask, off + 4 * (i / 32), offmask);
if (res < 0)
return -1;
}
}
res = 0;
*argc_p = argc;
*argv_p = argv;
return res;
}
static int parse_ip6_class(int *argc_p, char ***argv_p, struct tc_u32_sel *sel)
{
int res = -1;
int argc = *argc_p;
char **argv = *argv_p;
__u32 key;
__u32 mask;
int off = 0;
int offmask = 0;
if (argc < 2)
return -1;
if (get_u32(&key, *argv, 0))
return -1;
argc--; argv++;
if (get_u32(&mask, *argv, 16))
return -1;
argc--; argv++;
if (key > 0xFF || mask > 0xFF)
return -1;
key <<= 20;
mask <<= 20;
key = htonl(key);
mask = htonl(mask);
res = pack_key(sel, key, mask, off, offmask);
if (res < 0)
return -1;
*argc_p = argc;
*argv_p = argv;
return 0;
}
static int parse_ether_addr(int *argc_p, char ***argv_p,
struct tc_u32_sel *sel, int off)
{
int res = -1;
int argc = *argc_p;
char **argv = *argv_p;
__u8 addr[6];
int offmask = 0;
int i;
if (argc < 1)
return -1;
if (sscanf(*argv, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
addr + 0, addr + 1, addr + 2,
addr + 3, addr + 4, addr + 5) != 6) {
fprintf(stderr, "parse_ether_addr: improperly formed address '%s'\n",
*argv);
return -1;
}
argc--; argv++;
if (argc > 0 && strcmp(argv[0], "at") == 0) {
NEXT_ARG();
if (parse_at(&argc, &argv, &off, &offmask))
return -1;
}
for (i = 0; i < 6; i++) {
res = pack_key8(sel, addr[i], 0xFF, off + i, offmask);
if (res < 0)
return -1;
}
*argc_p = argc;
*argv_p = argv;
return res;
}
static int parse_ip(int *argc_p, char ***argv_p, struct tc_u32_sel *sel)
{
int res = -1;
int argc = *argc_p;
char **argv = *argv_p;
if (argc < 2)
return -1;
if (strcmp(*argv, "src") == 0) {
NEXT_ARG();
res = parse_ip_addr(&argc, &argv, sel, 12);
} else if (strcmp(*argv, "dst") == 0) {
NEXT_ARG();
res = parse_ip_addr(&argc, &argv, sel, 16);
} else if (strcmp(*argv, "tos") == 0 ||
matches(*argv, "dsfield") == 0 ||
matches(*argv, "precedence") == 0) {
NEXT_ARG();
res = parse_u8(&argc, &argv, sel, 1, 0);
} else if (strcmp(*argv, "ihl") == 0) {
NEXT_ARG();
res = parse_u8(&argc, &argv, sel, 0, 0);
} else if (strcmp(*argv, "protocol") == 0) {
NEXT_ARG();
res = parse_u8(&argc, &argv, sel, 9, 0);
} else if (strcmp(*argv, "nofrag") == 0) {
argc--; argv++;
res = pack_key16(sel, 0, 0x3FFF, 6, 0);
} else if (strcmp(*argv, "firstfrag") == 0) {
argc--; argv++;
res = pack_key16(sel, 0x2000, 0x3FFF, 6, 0);
} else if (strcmp(*argv, "df") == 0) {
argc--; argv++;
res = pack_key16(sel, 0x4000, 0x4000, 6, 0);
} else if (strcmp(*argv, "mf") == 0) {
argc--; argv++;
res = pack_key16(sel, 0x2000, 0x2000, 6, 0);
} else if (strcmp(*argv, "dport") == 0) {
NEXT_ARG();
res = parse_u16(&argc, &argv, sel, 22, 0);
} else if (strcmp(*argv, "sport") == 0) {
NEXT_ARG();
res = parse_u16(&argc, &argv, sel, 20, 0);
} else if (strcmp(*argv, "icmp_type") == 0) {
NEXT_ARG();
res = parse_u8(&argc, &argv, sel, 20, 0);
} else if (strcmp(*argv, "icmp_code") == 0) {
NEXT_ARG();
res = parse_u8(&argc, &argv, sel, 21, 0);
} else
return -1;
*argc_p = argc;
*argv_p = argv;
return res;
}
static int parse_ip6(int *argc_p, char ***argv_p, struct tc_u32_sel *sel)
{
int res = -1;
int argc = *argc_p;
char **argv = *argv_p;
if (argc < 2)
return -1;
if (strcmp(*argv, "src") == 0) {
NEXT_ARG();
res = parse_ip6_addr(&argc, &argv, sel, 8);
} else if (strcmp(*argv, "dst") == 0) {
NEXT_ARG();
res = parse_ip6_addr(&argc, &argv, sel, 24);
} else if (strcmp(*argv, "priority") == 0) {
NEXT_ARG();
res = parse_ip6_class(&argc, &argv, sel);
} else if (strcmp(*argv, "protocol") == 0) {
NEXT_ARG();
res = parse_u8(&argc, &argv, sel, 6, 0);
} else if (strcmp(*argv, "flowlabel") == 0) {
NEXT_ARG();
res = parse_u32(&argc, &argv, sel, 0, 0);
} else if (strcmp(*argv, "dport") == 0) {
NEXT_ARG();
res = parse_u16(&argc, &argv, sel, 42, 0);
} else if (strcmp(*argv, "sport") == 0) {
NEXT_ARG();
res = parse_u16(&argc, &argv, sel, 40, 0);
} else if (strcmp(*argv, "icmp_type") == 0) {
NEXT_ARG();
res = parse_u8(&argc, &argv, sel, 40, 0);
} else if (strcmp(*argv, "icmp_code") == 0) {
NEXT_ARG();
res = parse_u8(&argc, &argv, sel, 41, 1);
} else
return -1;
*argc_p = argc;
*argv_p = argv;
return res;
}
static int parse_ether(int *argc_p, char ***argv_p, struct tc_u32_sel *sel)
{
int res = -1;
int argc = *argc_p;
char **argv = *argv_p;
if (argc < 2)
return -1;
if (strcmp(*argv, "src") == 0) {
NEXT_ARG();
res = parse_ether_addr(&argc, &argv, sel, -8);
} else if (strcmp(*argv, "dst") == 0) {
NEXT_ARG();
res = parse_ether_addr(&argc, &argv, sel, -14);
} else {
fprintf(stderr, "Unknown match: ether %s\n", *argv);
return -1;
}
*argc_p = argc;
*argv_p = argv;
return res;
}
#define parse_tcp parse_udp
static int parse_udp(int *argc_p, char ***argv_p, struct tc_u32_sel *sel)
{
int res = -1;
int argc = *argc_p;
char **argv = *argv_p;
if (argc < 2)
return -1;
if (strcmp(*argv, "src") == 0) {
NEXT_ARG();
res = parse_u16(&argc, &argv, sel, 0, -1);
} else if (strcmp(*argv, "dst") == 0) {
NEXT_ARG();
res = parse_u16(&argc, &argv, sel, 2, -1);
} else
return -1;
*argc_p = argc;
*argv_p = argv;
return res;
}
static int parse_icmp(int *argc_p, char ***argv_p, struct tc_u32_sel *sel)
{
int res = -1;
int argc = *argc_p;
char **argv = *argv_p;
if (argc < 2)
return -1;
if (strcmp(*argv, "type") == 0) {
NEXT_ARG();
res = parse_u8(&argc, &argv, sel, 0, -1);
} else if (strcmp(*argv, "code") == 0) {
NEXT_ARG();
res = parse_u8(&argc, &argv, sel, 1, -1);
} else
return -1;
*argc_p = argc;
*argv_p = argv;
return res;
}
static int parse_mark(int *argc_p, char ***argv_p, struct nlmsghdr *n)
{
int res = -1;
int argc = *argc_p;
char **argv = *argv_p;
struct tc_u32_mark mark;
if (argc <= 1)
return -1;
if (get_u32(&mark.val, *argv, 0)) {
fprintf(stderr, "Illegal \"mark\" value\n");
return -1;
}
NEXT_ARG();
if (get_u32(&mark.mask, *argv, 0)) {
fprintf(stderr, "Illegal \"mark\" mask\n");
return -1;
}
NEXT_ARG();
if ((mark.val & mark.mask) != mark.val) {
fprintf(stderr, "Illegal \"mark\" (impossible combination)\n");
return -1;
}
addattr_l(n, MAX_MSG, TCA_U32_MARK, &mark, sizeof(mark));
res = 0;
*argc_p = argc;
*argv_p = argv;
return res;
}
static int parse_selector(int *argc_p, char ***argv_p,
struct tc_u32_sel *sel, struct nlmsghdr *n)
{
int argc = *argc_p;
char **argv = *argv_p;
int res = -1;
if (argc <= 0)
return -1;
if (matches(*argv, "u32") == 0) {
NEXT_ARG();
res = parse_u32(&argc, &argv, sel, 0, 0);
} else if (matches(*argv, "u16") == 0) {
NEXT_ARG();
res = parse_u16(&argc, &argv, sel, 0, 0);
} else if (matches(*argv, "u8") == 0) {
NEXT_ARG();
res = parse_u8(&argc, &argv, sel, 0, 0);
} else if (matches(*argv, "ip") == 0) {
NEXT_ARG();
res = parse_ip(&argc, &argv, sel);
} else if (matches(*argv, "ip6") == 0) {
NEXT_ARG();
res = parse_ip6(&argc, &argv, sel);
} else if (matches(*argv, "udp") == 0) {
NEXT_ARG();
res = parse_udp(&argc, &argv, sel);
} else if (matches(*argv, "tcp") == 0) {
NEXT_ARG();
res = parse_tcp(&argc, &argv, sel);
} else if (matches(*argv, "icmp") == 0) {
NEXT_ARG();
res = parse_icmp(&argc, &argv, sel);
} else if (matches(*argv, "mark") == 0) {
NEXT_ARG();
res = parse_mark(&argc, &argv, n);
} else if (matches(*argv, "ether") == 0) {
NEXT_ARG();
res = parse_ether(&argc, &argv, sel);
} else
return -1;
*argc_p = argc;
*argv_p = argv;
return res;
}
static int parse_offset(int *argc_p, char ***argv_p, struct tc_u32_sel *sel)
{
int argc = *argc_p;
char **argv = *argv_p;
while (argc > 0) {
if (matches(*argv, "plus") == 0) {
int off;
NEXT_ARG();
if (get_integer(&off, *argv, 0))
return -1;
sel->off = off;
sel->flags |= TC_U32_OFFSET;
} else if (matches(*argv, "at") == 0) {
int off;
NEXT_ARG();
if (get_integer(&off, *argv, 0))
return -1;
sel->offoff = off;
if (off%2) {
fprintf(stderr, "offset \"at\" must be even\n");
return -1;
}
sel->flags |= TC_U32_VAROFFSET;
} else if (matches(*argv, "mask") == 0) {
NEXT_ARG();
if (get_be16(&sel->offmask, *argv, 16))
return -1;
sel->flags |= TC_U32_VAROFFSET;
} else if (matches(*argv, "shift") == 0) {
int shift;
NEXT_ARG();
if (get_integer(&shift, *argv, 0))
return -1;
sel->offshift = shift;
sel->flags |= TC_U32_VAROFFSET;
} else if (matches(*argv, "eat") == 0) {
sel->flags |= TC_U32_EAT;
} else {
break;
}
argc--; argv++;
}
*argc_p = argc;
*argv_p = argv;
return 0;
}
static int parse_hashkey(int *argc_p, char ***argv_p, struct tc_u32_sel *sel)
{
int argc = *argc_p;
char **argv = *argv_p;
while (argc > 0) {
if (matches(*argv, "mask") == 0) {
NEXT_ARG();
if (get_be32(&sel->hmask, *argv, 16))
return -1;
} else if (matches(*argv, "at") == 0) {
int num;
NEXT_ARG();
if (get_integer(&num, *argv, 0))
return -1;
if (num%4)
return -1;
sel->hoff = num;
} else {
break;
}
argc--; argv++;
}
*argc_p = argc;
*argv_p = argv;
return 0;
}
static void print_ipv4(FILE *f, const struct tc_u32_key *key)
{
char abuf[256];
switch (key->off) {
case 0:
switch (ntohl(key->mask)) {
case 0x0f000000:
fprintf(f, "\n match IP ihl %u",
ntohl(key->val) >> 24);
return;
case 0x00ff0000:
fprintf(f, "\n match IP dsfield %#x",
ntohl(key->val) >> 16);
return;
}
break;
case 8:
if (ntohl(key->mask) == 0x00ff0000) {
fprintf(f, "\n match IP protocol %d",
ntohl(key->val) >> 16);
return;
}
break;
case 12:
case 16: {
int bits = mask2bits(key->mask);
if (bits >= 0) {
fprintf(f, "\n %s %s/%d",
key->off == 12 ? "match IP src" : "match IP dst",
inet_ntop(AF_INET, &key->val,
abuf, sizeof(abuf)),
bits);
return;
}
}
break;
case 20:
switch (ntohl(key->mask)) {
case 0x0000ffff:
fprintf(f, "\n match dport %u",
ntohl(key->val) & 0xffff);
return;
case 0xffff0000:
fprintf(f, "\n match sport %u",
ntohl(key->val) >> 16);
return;
case 0xffffffff:
fprintf(f, "\n match dport %u, match sport %u",
ntohl(key->val) & 0xffff,
ntohl(key->val) >> 16);
return;
}
/* XXX: Default print_raw */
}
}
static void print_ipv6(FILE *f, const struct tc_u32_key *key)
{
char abuf[256];
switch (key->off) {
case 0:
switch (ntohl(key->mask)) {
case 0x0f000000:
fprintf(f, "\n match IP ihl %u",
ntohl(key->val) >> 24);
return;
case 0x00ff0000:
fprintf(f, "\n match IP dsfield %#x",
ntohl(key->val) >> 16);
return;
}
break;
case 8:
if (ntohl(key->mask) == 0x00ff0000) {
fprintf(f, "\n match IP protocol %d",
ntohl(key->val) >> 16);
return;
}
break;
case 12:
case 16: {
int bits = mask2bits(key->mask);
if (bits >= 0) {
fprintf(f, "\n %s %s/%d",
key->off == 12 ? "match IP src" : "match IP dst",
inet_ntop(AF_INET, &key->val,
abuf, sizeof(abuf)),
bits);
return;
}
}
break;
case 20:
switch (ntohl(key->mask)) {
case 0x0000ffff:
fprintf(f, "\n match sport %u",
ntohl(key->val) & 0xffff);
return;
case 0xffff0000:
fprintf(f, "\n match dport %u",
ntohl(key->val) >> 16);
return;
case 0xffffffff:
fprintf(f, "\n match sport %u, match dport %u",
ntohl(key->val) & 0xffff,
ntohl(key->val) >> 16);
return;
}
/* XXX: Default print_raw */
}
}
static void print_raw(FILE *f, const struct tc_u32_key *key)
{
fprintf(f, "\n match %08x/%08x at %s%d",
(unsigned int)ntohl(key->val),
(unsigned int)ntohl(key->mask),
key->offmask ? "nexthdr+" : "",
key->off);
}
static const struct {
__u16 proto;
__u16 pad;
void (*pprinter)(FILE *f, const struct tc_u32_key *key);
} u32_pprinters[] = {
{0, 0, print_raw},
{ETH_P_IP, 0, print_ipv4},
{ETH_P_IPV6, 0, print_ipv6},
};
static void show_keys(FILE *f, const struct tc_u32_key *key)
{
int i = 0;
if (!pretty)
goto show_k;
for (i = 0; i < ARRAY_SIZE(u32_pprinters); i++) {
if (u32_pprinters[i].proto == ntohs(f_proto)) {
show_k:
u32_pprinters[i].pprinter(f, key);
return;
}
}
i = 0;
goto show_k;
}
static int u32_parse_opt(struct filter_util *qu, char *handle,
int argc, char **argv, struct nlmsghdr *n)
{
struct {
struct tc_u32_sel sel;
struct tc_u32_key keys[128];
} sel = {};
struct tcmsg *t = NLMSG_DATA(n);
struct rtattr *tail;
int sel_ok = 0, terminal_ok = 0;
int sample_ok = 0;
__u32 htid = 0;
__u32 order = 0;
__u32 flags = 0;
if (handle && get_u32_handle(&t->tcm_handle, handle)) {
fprintf(stderr, "Illegal filter ID\n");
return -1;
}
if (argc == 0)
return 0;
tail = addattr_nest(n, MAX_MSG, TCA_OPTIONS);
while (argc > 0) {
if (matches(*argv, "match") == 0) {
NEXT_ARG();
if (parse_selector(&argc, &argv, &sel.sel, n)) {
fprintf(stderr, "Illegal \"match\"\n");
return -1;
}
sel_ok++;
continue;
} else if (matches(*argv, "offset") == 0) {
NEXT_ARG();
if (parse_offset(&argc, &argv, &sel.sel)) {
fprintf(stderr, "Illegal \"offset\"\n");
return -1;
}
continue;
} else if (matches(*argv, "hashkey") == 0) {
NEXT_ARG();
if (parse_hashkey(&argc, &argv, &sel.sel)) {
fprintf(stderr, "Illegal \"hashkey\"\n");
return -1;
}
continue;
} else if (matches(*argv, "classid") == 0 ||
strcmp(*argv, "flowid") == 0) {
unsigned int flowid;
NEXT_ARG();
if (get_tc_classid(&flowid, *argv)) {
fprintf(stderr, "Illegal \"classid\"\n");
return -1;
}
addattr_l(n, MAX_MSG, TCA_U32_CLASSID, &flowid, 4);
sel.sel.flags |= TC_U32_TERMINAL;
} else if (matches(*argv, "divisor") == 0) {
unsigned int divisor;
NEXT_ARG();
if (get_unsigned(&divisor, *argv, 0) ||
divisor == 0 ||
divisor > 0x100 || ((divisor - 1) & divisor)) {
fprintf(stderr, "Illegal \"divisor\"\n");
return -1;
}
addattr_l(n, MAX_MSG, TCA_U32_DIVISOR, &divisor, 4);
} else if (matches(*argv, "order") == 0) {
NEXT_ARG();
if (get_u32(&order, *argv, 0)) {
fprintf(stderr, "Illegal \"order\"\n");
return -1;
}
} else if (strcmp(*argv, "link") == 0) {
unsigned int linkid;
NEXT_ARG();
if (get_u32_handle(&linkid, *argv)) {
fprintf(stderr, "Illegal \"link\"\n");
return -1;
}
if (linkid && TC_U32_NODE(linkid)) {
fprintf(stderr, "\"link\" must be a hash table.\n");
return -1;
}
addattr_l(n, MAX_MSG, TCA_U32_LINK, &linkid, 4);
} else if (strcmp(*argv, "ht") == 0) {
unsigned int ht;
NEXT_ARG();
if (get_u32_handle(&ht, *argv)) {
fprintf(stderr, "Illegal \"ht\"\n");
return -1;
}
if (handle && TC_U32_NODE(ht)) {
fprintf(stderr, "\"ht\" must be a hash table.\n");
return -1;
}
if (sample_ok)
htid = (htid & 0xFF000) | (ht & 0xFFF00000);
else
htid = (ht & 0xFFFFF000);
} else if (strcmp(*argv, "sample") == 0) {
__u32 hash;
unsigned int divisor = 0x100;
struct {
struct tc_u32_sel sel;
struct tc_u32_key keys[4];
} sel2 = {};
NEXT_ARG();
if (parse_selector(&argc, &argv, &sel2.sel, n)) {
fprintf(stderr, "Illegal \"sample\"\n");
return -1;
}
if (sel2.sel.nkeys != 1) {
fprintf(stderr, "\"sample\" must contain exactly ONE key.\n");
return -1;
}
if (*argv != 0 && strcmp(*argv, "divisor") == 0) {
NEXT_ARG();
if (get_unsigned(&divisor, *argv, 0) ||
divisor == 0 || divisor > 0x100 ||
((divisor - 1) & divisor)) {
fprintf(stderr, "Illegal sample \"divisor\"\n");
return -1;
}
NEXT_ARG();
}
hash = sel2.sel.keys[0].val & sel2.sel.keys[0].mask;
hash ^= hash >> 16;
hash ^= hash >> 8;
htid = ((hash % divisor) << 12) | (htid & 0xFFF00000);
sample_ok = 1;
continue;
} else if (strcmp(*argv, "indev") == 0) {
char ind[IFNAMSIZ + 1] = {};
argc--;
argv++;
if (argc < 1) {
fprintf(stderr, "Illegal indev\n");
return -1;
}
strncpy(ind, *argv, sizeof(ind) - 1);
addattr_l(n, MAX_MSG, TCA_U32_INDEV, ind,
strlen(ind) + 1);
} else if (matches(*argv, "action") == 0) {
NEXT_ARG();
if (parse_action(&argc, &argv, TCA_U32_ACT, n)) {
fprintf(stderr, "Illegal \"action\"\n");
return -1;
}
terminal_ok++;
continue;
} else if (matches(*argv, "police") == 0) {
NEXT_ARG();
if (parse_police(&argc, &argv, TCA_U32_POLICE, n)) {
fprintf(stderr, "Illegal \"police\"\n");
return -1;
}
terminal_ok++;
continue;
} else if (strcmp(*argv, "skip_hw") == 0) {
flags |= TCA_CLS_FLAGS_SKIP_HW;
} else if (strcmp(*argv, "skip_sw") == 0) {
flags |= TCA_CLS_FLAGS_SKIP_SW;
} else if (strcmp(*argv, "help") == 0) {
explain();
return -1;
} else {
fprintf(stderr, "What is \"%s\"?\n", *argv);
explain();
return -1;
}
argc--; argv++;
}
/* We don't necessarily need class/flowids */
if (terminal_ok)
sel.sel.flags |= TC_U32_TERMINAL;
if (order) {
if (TC_U32_NODE(t->tcm_handle) &&
order != TC_U32_NODE(t->tcm_handle)) {
fprintf(stderr, "\"order\" contradicts \"handle\"\n");
return -1;
}
t->tcm_handle |= order;
}
if (htid)
addattr_l(n, MAX_MSG, TCA_U32_HASH, &htid, 4);
if (sel_ok)
addattr_l(n, MAX_MSG, TCA_U32_SEL, &sel,
sizeof(sel.sel) +
sel.sel.nkeys * sizeof(struct tc_u32_key));
if (flags) {
if (!(flags ^ (TCA_CLS_FLAGS_SKIP_HW |
TCA_CLS_FLAGS_SKIP_SW))) {
fprintf(stderr,
"skip_hw and skip_sw are mutually exclusive\n");
return -1;
}
addattr_l(n, MAX_MSG, TCA_U32_FLAGS, &flags, 4);
}
addattr_nest_end(n, tail);
return 0;
}
static int u32_print_opt(struct filter_util *qu, FILE *f, struct rtattr *opt,
__u32 handle)
{
struct rtattr *tb[TCA_U32_MAX + 1];
struct tc_u32_sel *sel = NULL;
struct tc_u32_pcnt *pf = NULL;
if (opt == NULL)
return 0;
parse_rtattr_nested(tb, TCA_U32_MAX, opt);
if (handle) {
SPRINT_BUF(b1);
fprintf(f, "fh %s ", sprint_u32_handle(handle, b1));
}
if (TC_U32_NODE(handle))
fprintf(f, "order %d ", TC_U32_NODE(handle));
if (tb[TCA_U32_SEL]) {
if (RTA_PAYLOAD(tb[TCA_U32_SEL]) < sizeof(*sel))
return -1;
sel = RTA_DATA(tb[TCA_U32_SEL]);
}
if (tb[TCA_U32_DIVISOR]) {
fprintf(f, "ht divisor %d ",
rta_getattr_u32(tb[TCA_U32_DIVISOR]));
} else if (tb[TCA_U32_HASH]) {
__u32 htid = rta_getattr_u32(tb[TCA_U32_HASH]);
fprintf(f, "key ht %x bkt %x ", TC_U32_USERHTID(htid),
TC_U32_HASH(htid));
} else {
fprintf(f, "??? ");
}
if (tb[TCA_U32_CLASSID]) {
SPRINT_BUF(b1);
fprintf(f, "%sflowid %s ",
!sel || !(sel->flags & TC_U32_TERMINAL) ? "*" : "",
sprint_tc_classid(rta_getattr_u32(tb[TCA_U32_CLASSID]),
b1));
} else if (sel && sel->flags & TC_U32_TERMINAL) {
fprintf(f, "terminal flowid ??? ");
}
if (tb[TCA_U32_LINK]) {
SPRINT_BUF(b1);
fprintf(f, "link %s ",
sprint_u32_handle(rta_getattr_u32(tb[TCA_U32_LINK]),
b1));
}
if (tb[TCA_U32_FLAGS]) {
__u32 flags = rta_getattr_u32(tb[TCA_U32_FLAGS]);
if (flags & TCA_CLS_FLAGS_SKIP_HW)
fprintf(f, "skip_hw ");
if (flags & TCA_CLS_FLAGS_SKIP_SW)
fprintf(f, "skip_sw ");
if (flags & TCA_CLS_FLAGS_IN_HW)
fprintf(f, "in_hw ");
else if (flags & TCA_CLS_FLAGS_NOT_IN_HW)
fprintf(f, "not_in_hw ");
}
if (tb[TCA_U32_PCNT]) {
if (RTA_PAYLOAD(tb[TCA_U32_PCNT]) < sizeof(*pf)) {
fprintf(f, "Broken perf counters\n");
return -1;
}
pf = RTA_DATA(tb[TCA_U32_PCNT]);
}
if (sel && show_stats && NULL != pf)
fprintf(f, " (rule hit %llu success %llu)",
(unsigned long long) pf->rcnt,
(unsigned long long) pf->rhit);
if (tb[TCA_U32_MARK]) {
struct tc_u32_mark *mark = RTA_DATA(tb[TCA_U32_MARK]);
if (RTA_PAYLOAD(tb[TCA_U32_MARK]) < sizeof(*mark)) {
fprintf(f, "\n Invalid mark (kernel&iproute2 mismatch)\n");
} else {
fprintf(f, "\n mark 0x%04x 0x%04x (success %d)",
mark->val, mark->mask, mark->success);
}
}
if (sel) {
if (sel->nkeys) {
int i;
for (i = 0; i < sel->nkeys; i++) {
show_keys(f, sel->keys + i);
if (show_stats && NULL != pf)
fprintf(f, " (success %llu ) ",
(unsigned long long) pf->kcnts[i]);
}
}
if (sel->flags & (TC_U32_VAROFFSET | TC_U32_OFFSET)) {
fprintf(f, "\n offset ");
if (sel->flags & TC_U32_VAROFFSET)
fprintf(f, "%04x>>%d at %d ",
ntohs(sel->offmask),
sel->offshift, sel->offoff);
if (sel->off)
fprintf(f, "plus %d ", sel->off);
}
if (sel->flags & TC_U32_EAT)
fprintf(f, " eat ");
if (sel->hmask) {
fprintf(f, "\n hash mask %08x at %d ",
(unsigned int)htonl(sel->hmask), sel->hoff);
}
}
if (tb[TCA_U32_POLICE]) {
fprintf(f, "\n");
tc_print_police(f, tb[TCA_U32_POLICE]);
}
if (tb[TCA_U32_INDEV]) {
struct rtattr *idev = tb[TCA_U32_INDEV];
fprintf(f, "\n input dev %s\n", rta_getattr_str(idev));
}
if (tb[TCA_U32_ACT])
tc_print_action(f, tb[TCA_U32_ACT], 0);
return 0;
}
struct filter_util u32_filter_util = {
.id = "u32",
.parse_fopt = u32_parse_opt,
.print_fopt = u32_print_opt,
};
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