mirror of
https://git.kernel.org/pub/scm/network/iproute2/iproute2.git
synced 2024-11-16 06:25:35 +08:00
d17b136f7d
This big patch was compiled by vimgrepping for memset calls and changing to C99 initializer if applicable. One notable exception is the initialization of union bpf_attr in tc/tc_bpf.c: changing it would break for older gcc versions (at least <=3.4.6). Calls to memset for struct rtattr pointer fields for parse_rtattr*() were just dropped since they are not needed. The changes here allowed the compiler to discover some unused variables, so get rid of them, too. Signed-off-by: Phil Sutter <phil@nwl.cc> Acked-by: David Ahern <dsa@cumulusnetworks.com>
142 lines
3.4 KiB
C
142 lines
3.4 KiB
C
/*
|
|
* em_nbyte.c N-Byte Ematch
|
|
*
|
|
* This program is free software; you can distribute 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: Thomas Graf <tgraf@suug.ch>
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <syslog.h>
|
|
#include <fcntl.h>
|
|
#include <sys/socket.h>
|
|
#include <netinet/in.h>
|
|
#include <arpa/inet.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
|
|
#include "m_ematch.h"
|
|
#include <linux/tc_ematch/tc_em_nbyte.h>
|
|
|
|
extern struct ematch_util nbyte_ematch_util;
|
|
|
|
static void nbyte_print_usage(FILE *fd)
|
|
{
|
|
fprintf(fd,
|
|
"Usage: nbyte(NEEDLE at OFFSET [layer LAYER])\n" \
|
|
"where: NEEDLE := { string | \"c-escape-sequence\" }\n" \
|
|
" OFFSET := int\n" \
|
|
" LAYER := { link | network | transport | 0..%d }\n" \
|
|
"\n" \
|
|
"Example: nbyte(\"ababa\" at 12 layer 1)\n",
|
|
TCF_LAYER_MAX);
|
|
}
|
|
|
|
static int nbyte_parse_eopt(struct nlmsghdr *n, struct tcf_ematch_hdr *hdr,
|
|
struct bstr *args)
|
|
{
|
|
struct bstr *a;
|
|
struct bstr *needle = args;
|
|
unsigned long offset = 0, layer = TCF_LAYER_NETWORK;
|
|
int offset_present = 0;
|
|
struct tcf_em_nbyte nb = {};
|
|
|
|
#define PARSE_ERR(CARG, FMT, ARGS...) \
|
|
em_parse_error(EINVAL, args, CARG, &nbyte_ematch_util, FMT, ##ARGS)
|
|
|
|
if (args == NULL)
|
|
return PARSE_ERR(args, "nbyte: missing arguments");
|
|
|
|
if (needle->len <= 0)
|
|
return PARSE_ERR(args, "nbyte: needle length is 0");
|
|
|
|
for (a = bstr_next(args); a; a = bstr_next(a)) {
|
|
if (!bstrcmp(a, "at")) {
|
|
if (a->next == NULL)
|
|
return PARSE_ERR(a, "nbyte: missing argument");
|
|
a = bstr_next(a);
|
|
|
|
offset = bstrtoul(a);
|
|
if (offset == ULONG_MAX)
|
|
return PARSE_ERR(a, "nbyte: invalid offset, " \
|
|
"must be numeric");
|
|
|
|
offset_present = 1;
|
|
} else if (!bstrcmp(a, "layer")) {
|
|
if (a->next == NULL)
|
|
return PARSE_ERR(a, "nbyte: missing argument");
|
|
a = bstr_next(a);
|
|
|
|
layer = parse_layer(a);
|
|
if (layer == INT_MAX) {
|
|
layer = bstrtoul(a);
|
|
if (layer == ULONG_MAX)
|
|
return PARSE_ERR(a, "nbyte: invalid " \
|
|
"layer");
|
|
}
|
|
|
|
if (layer > TCF_LAYER_MAX)
|
|
return PARSE_ERR(a, "nbyte: illegal layer, " \
|
|
"must be in 0..%d", TCF_LAYER_MAX);
|
|
} else
|
|
return PARSE_ERR(a, "nbyte: unknown parameter");
|
|
}
|
|
|
|
if (offset_present == 0)
|
|
return PARSE_ERR(a, "nbyte: offset required");
|
|
|
|
nb.len = needle->len;
|
|
nb.layer = (__u8) layer;
|
|
nb.off = (__u16) offset;
|
|
|
|
addraw_l(n, MAX_MSG, hdr, sizeof(*hdr));
|
|
addraw_l(n, MAX_MSG, &nb, sizeof(nb));
|
|
addraw_l(n, MAX_MSG, needle->data, needle->len);
|
|
|
|
#undef PARSE_ERR
|
|
return 0;
|
|
}
|
|
|
|
static int nbyte_print_eopt(FILE *fd, struct tcf_ematch_hdr *hdr, void *data,
|
|
int data_len)
|
|
{
|
|
int i;
|
|
struct tcf_em_nbyte *nb = data;
|
|
__u8 *needle;
|
|
|
|
if (data_len < sizeof(*nb)) {
|
|
fprintf(stderr, "NByte header size mismatch\n");
|
|
return -1;
|
|
}
|
|
|
|
if (data_len < sizeof(*nb) + nb->len) {
|
|
fprintf(stderr, "NByte payload size mismatch\n");
|
|
return -1;
|
|
}
|
|
|
|
needle = data + sizeof(*nb);
|
|
|
|
for (i = 0; i < nb->len; i++)
|
|
fprintf(fd, "%02x ", needle[i]);
|
|
|
|
fprintf(fd, "\"");
|
|
for (i = 0; i < nb->len; i++)
|
|
fprintf(fd, "%c", isprint(needle[i]) ? needle[i] : '.');
|
|
fprintf(fd, "\" at %d layer %d", nb->off, nb->layer);
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct ematch_util nbyte_ematch_util = {
|
|
.kind = "nbyte",
|
|
.kind_num = TCF_EM_NBYTE,
|
|
.parse_eopt = nbyte_parse_eopt,
|
|
.print_eopt = nbyte_print_eopt,
|
|
.print_usage = nbyte_print_usage
|
|
};
|