summaryrefslogtreecommitdiffstats
path: root/netlink/parser.c
diff options
context:
space:
mode:
Diffstat (limited to 'netlink/parser.c')
-rw-r--r--netlink/parser.c1141
1 files changed, 1141 insertions, 0 deletions
diff --git a/netlink/parser.c b/netlink/parser.c
new file mode 100644
index 0000000..6f86361
--- /dev/null
+++ b/netlink/parser.c
@@ -0,0 +1,1141 @@
+/*
+ * parser.c - netlink command line parser
+ *
+ * Implementation of command line parser used by netlink code.
+ */
+
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <ctype.h>
+
+#include "../internal.h"
+#include "../common.h"
+#include "netlink.h"
+#include "parser.h"
+
+static void parser_err_unknown_param(struct nl_context *nlctx)
+{
+ fprintf(stderr, "ethtool (%s): unknown parameter '%s'\n", nlctx->cmd,
+ nlctx->param);
+}
+
+static void parser_err_dup_param(struct nl_context *nlctx)
+{
+ fprintf(stderr, "ethtool (%s): duplicate parameter '%s'\n", nlctx->cmd,
+ nlctx->param);
+}
+
+static void parser_err_min_argc(struct nl_context *nlctx, unsigned int min_argc)
+{
+ if (min_argc == 1)
+ fprintf(stderr, "ethtool (%s): no value for parameter '%s'\n",
+ nlctx->cmd, nlctx->param);
+ else
+ fprintf(stderr,
+ "ethtool (%s): parameter '%s' requires %u words\n",
+ nlctx->cmd, nlctx->param, min_argc);
+}
+
+static void parser_err_invalid_value(struct nl_context *nlctx, const char *val)
+{
+ fprintf(stderr, "ethtool (%s): invalid value '%s' for parameter '%s'\n",
+ nlctx->cmd, val, nlctx->param);
+}
+
+static void parser_err_invalid_flag(struct nl_context *nlctx, const char *flag)
+{
+ fprintf(stderr, "ethtool (%s): flag '%s' for parameter '%s' is not followed by 'on' or 'off'\n",
+ nlctx->cmd, flag, nlctx->param);
+}
+
+static bool __prefix_0x(const char *p)
+{
+ return p[0] == '0' && (p[1] == 'x' || p[1] == 'X');
+}
+
+static float parse_float(const char *arg, float *result, float min,
+ float max)
+{
+ char *endptr;
+ float val;
+
+ if (!arg || !arg[0])
+ return -EINVAL;
+ val = strtof(arg, &endptr);
+ if (*endptr || val < min || val > max)
+ return -EINVAL;
+
+ *result = val;
+ return 0;
+}
+
+static int __parse_u32(const char *arg, uint32_t *result, uint32_t min,
+ uint32_t max, int base)
+{
+ unsigned long long val;
+ char *endptr;
+
+ if (!arg || !arg[0])
+ return -EINVAL;
+ val = strtoul(arg, &endptr, base);
+ if (*endptr || val < min || val > max)
+ return -EINVAL;
+
+ *result = (uint32_t)val;
+ return 0;
+}
+
+static int parse_u32d(const char *arg, uint32_t *result)
+{
+ return __parse_u32(arg, result, 0, 0xffffffff, 10);
+}
+
+static int parse_x32(const char *arg, uint32_t *result)
+{
+ return __parse_u32(arg, result, 0, 0xffffffff, 16);
+}
+
+int parse_u32(const char *arg, uint32_t *result)
+{
+ if (!arg)
+ return -EINVAL;
+ if (__prefix_0x(arg))
+ return parse_x32(arg + 2, result);
+ else
+ return parse_u32d(arg, result);
+}
+
+static int parse_u8(const char *arg, uint8_t *result)
+{
+ uint32_t val;
+ int ret = parse_u32(arg, &val);
+
+ if (ret < 0)
+ return ret;
+ if (val > UINT8_MAX)
+ return -EINVAL;
+
+ *result = (uint8_t)val;
+ return 0;
+}
+
+static int lookup_u32(const char *arg, uint32_t *result,
+ const struct lookup_entry_u32 *tbl)
+{
+ if (!arg)
+ return -EINVAL;
+ while (tbl->arg) {
+ if (!strcmp(tbl->arg, arg)) {
+ *result = tbl->val;
+ return 0;
+ }
+ tbl++;
+ }
+
+ return -EINVAL;
+}
+
+static int lookup_u8(const char *arg, uint8_t *result,
+ const struct lookup_entry_u8 *tbl)
+{
+ if (!arg)
+ return -EINVAL;
+ while (tbl->arg) {
+ if (!strcmp(tbl->arg, arg)) {
+ *result = tbl->val;
+ return 0;
+ }
+ tbl++;
+ }
+
+ return -EINVAL;
+}
+
+/* Parser handler for a flag. Expects a name (with no additional argument),
+ * generates NLA_FLAG or sets a bool (if the name was present).
+ */
+int nl_parse_flag(struct nl_context *nlctx __maybe_unused, uint16_t type,
+ const void *data __maybe_unused, struct nl_msg_buff *msgbuff,
+ void *dest)
+{
+ if (dest)
+ *(bool *)dest = true;
+ return (type && ethnla_put_flag(msgbuff, type, true)) ? -EMSGSIZE : 0;
+}
+
+/* Parser handler for null terminated string. Expects a string argument,
+ * generates NLA_NUL_STRING or fills const char *
+ */
+int nl_parse_string(struct nl_context *nlctx, uint16_t type,
+ const void *data __maybe_unused,
+ struct nl_msg_buff *msgbuff, void *dest)
+{
+ const char *arg = *nlctx->argp;
+
+ nlctx->argp++;
+ nlctx->argc--;
+
+ if (dest)
+ *(const char **)dest = arg;
+ return (type && ethnla_put_strz(msgbuff, type, arg)) ? -EMSGSIZE : 0;
+}
+
+/* Parser handler for unsigned 32-bit integer. Expects a numeric argument
+ * (may use 0x prefix), generates NLA_U32 or fills an uint32_t.
+ */
+int nl_parse_direct_u32(struct nl_context *nlctx, uint16_t type,
+ const void *data __maybe_unused,
+ struct nl_msg_buff *msgbuff, void *dest)
+{
+ const char *arg = *nlctx->argp;
+ uint32_t val;
+ int ret;
+
+ nlctx->argp++;
+ nlctx->argc--;
+ ret = parse_u32(arg, &val);
+ if (ret < 0) {
+ parser_err_invalid_value(nlctx, arg);
+ return ret;
+ }
+
+ if (dest)
+ *(uint32_t *)dest = val;
+ return (type && ethnla_put_u32(msgbuff, type, val)) ? -EMSGSIZE : 0;
+}
+
+/* Parser handler for unsigned 32-bit integer. Expects a numeric argument
+ * (may use 0x prefix), generates NLA_U32 or fills an uint32_t.
+ */
+int nl_parse_direct_u8(struct nl_context *nlctx, uint16_t type,
+ const void *data __maybe_unused,
+ struct nl_msg_buff *msgbuff, void *dest)
+{
+ const char *arg = *nlctx->argp;
+ uint8_t val;
+ int ret;
+
+ nlctx->argp++;
+ nlctx->argc--;
+ ret = parse_u8(arg, &val);
+ if (ret < 0) {
+ parser_err_invalid_value(nlctx, arg);
+ return ret;
+ }
+
+ if (dest)
+ *(uint8_t *)dest = val;
+ return (type && ethnla_put_u8(msgbuff, type, val)) ? -EMSGSIZE : 0;
+}
+
+/* Parser handler for float meters and convert it to cm. Generates
+ * NLA_U32 or fills an uint32_t.
+ */
+int nl_parse_direct_m2cm(struct nl_context *nlctx, uint16_t type,
+ const void *data __maybe_unused,
+ struct nl_msg_buff *msgbuff, void *dest)
+{
+ const char *arg = *nlctx->argp;
+ float meters = 0.0;
+ uint32_t cm;
+ int ret;
+
+ nlctx->argp++;
+ nlctx->argc--;
+ ret = parse_float(arg, &meters, 0, 150);
+ if (ret < 0) {
+ parser_err_invalid_value(nlctx, arg);
+ return ret;
+ }
+
+ cm = (uint32_t)(meters * 100 + 0.5);
+ if (dest)
+ *(uint32_t *)dest = cm;
+ return (type && ethnla_put_u32(msgbuff, type, cm)) ? -EMSGSIZE : 0;
+}
+
+/* Parser handler for (tri-state) bool. Expects "name on|off", generates
+ * NLA_U8 which is 1 for "on" and 0 for "off".
+ */
+int nl_parse_u8bool(struct nl_context *nlctx, uint16_t type,
+ const void *data __maybe_unused,
+ struct nl_msg_buff *msgbuff, void *dest)
+{
+ const char *arg = *nlctx->argp;
+ int ret;
+
+ nlctx->argp++;
+ nlctx->argc--;
+ if (!strcmp(arg, "on")) {
+ if (dest)
+ *(uint8_t *)dest = 1;
+ ret = type ? ethnla_put_u8(msgbuff, type, 1) : 0;
+ } else if (!strcmp(arg, "off")) {
+ if (dest)
+ *(uint8_t *)dest = 0;
+ ret = type ? ethnla_put_u8(msgbuff, type, 0) : 0;
+ } else {
+ parser_err_invalid_value(nlctx, arg);
+ return -EINVAL;
+ }
+
+ return ret ? -EMSGSIZE : 0;
+}
+
+/* Parser handler for 32-bit lookup value. Expects a string argument, looks it
+ * up in a table, generates NLA_U32 or fills uint32_t variable. The @data
+ * parameter is a null terminated array of struct lookup_entry_u32.
+ */
+int nl_parse_lookup_u32(struct nl_context *nlctx, uint16_t type,
+ const void *data, struct nl_msg_buff *msgbuff,
+ void *dest)
+{
+ const char *arg = *nlctx->argp;
+ uint32_t val;
+ int ret;
+
+ nlctx->argp++;
+ nlctx->argc--;
+ ret = lookup_u32(arg, &val, data);
+ if (ret < 0) {
+ parser_err_invalid_value(nlctx, arg);
+ return ret;
+ }
+
+ if (dest)
+ *(uint32_t *)dest = val;
+ return (type && ethnla_put_u32(msgbuff, type, val)) ? -EMSGSIZE : 0;
+}
+
+/* Parser handler for 8-bit lookup value. Expects a string argument, looks it
+ * up in a table, generates NLA_U8 or fills uint8_t variable. The @data
+ * parameter is a null terminated array of struct lookup_entry_u8.
+ */
+int nl_parse_lookup_u8(struct nl_context *nlctx, uint16_t type,
+ const void *data, struct nl_msg_buff *msgbuff,
+ void *dest)
+{
+ const char *arg = *nlctx->argp;
+ uint8_t val;
+ int ret;
+
+ nlctx->argp++;
+ nlctx->argc--;
+ ret = lookup_u8(arg, &val, data);
+ if (ret < 0) {
+ parser_err_invalid_value(nlctx, arg);
+ return ret;
+ }
+
+ if (dest)
+ *(uint8_t *)dest = val;
+ return (type && ethnla_put_u8(msgbuff, type, val)) ? -EMSGSIZE : 0;
+}
+
+/* number of significant bits */
+static unsigned int __nsb(uint32_t x)
+{
+ unsigned int ret = 0;
+
+ if (x & 0xffff0000U) {
+ x >>= 16;
+ ret += 16;
+ }
+ if (x & 0xff00U) {
+ x >>= 8;
+ ret += 8;
+ }
+ if (x & 0xf0U) {
+ x >>= 4;
+ ret += 4;
+ }
+ if (x & 0xcU) {
+ x >>= 2;
+ ret += 2;
+ }
+ if (x & 0x2U) {
+ x >>= 1;
+ ret += 1;
+ }
+
+ return ret + x;
+}
+
+static bool __is_hex(char c)
+{
+ if (isdigit(c))
+ return true;
+ else
+ return (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F');
+}
+
+static unsigned int __hex_val(char c)
+{
+ if (c >= '0' && c <= '9')
+ return c - '0';
+ if (c >= 'a' && c <= 'f')
+ return c - 'a' + 0xa;
+ if (c >= 'A' && c <= 'F')
+ return c - 'A' + 0xa;
+ return 0;
+}
+
+static bool __bytestr_delim(const char *p, char delim)
+{
+ return !*p || (delim ? (*p == delim) : !__is_hex(*p));
+}
+
+/* Parser handler for generic byte string in MAC-like format. Expects string
+ * argument in the "[[:xdigit:]]{2}(:[[:xdigit:]]{2})*" format, generates
+ * NLA_BINARY or fills a struct byte_str_value (if @dest is not null and the
+ * handler succeeds, caller is responsible for freeing the value). The @data
+ * parameter points to struct byte_str_parser_data.
+ */
+int nl_parse_byte_str(struct nl_context *nlctx, uint16_t type, const void *data,
+ struct nl_msg_buff *msgbuff, void *dest)
+{
+ const struct byte_str_parser_data *pdata = data;
+ struct byte_str_value *dest_value = dest;
+ const char *arg = *nlctx->argp;
+ uint8_t *val = NULL;
+ unsigned int len, i;
+ const char *p;
+ int ret;
+
+ nlctx->argp++;
+ nlctx->argc--;
+
+ len = 0;
+ p = arg;
+ if (!*p)
+ goto err;
+ while (true) {
+ len++;
+ if (!__bytestr_delim(p, pdata->delim))
+ p++;
+ if (!__bytestr_delim(p, pdata->delim))
+ p++;
+ if (!__bytestr_delim(p, pdata->delim))
+ goto err;
+ if (!*p)
+ break;
+ p++;
+ if (*p && __bytestr_delim(p, pdata->delim))
+ goto err;
+ }
+ if (len < pdata->min_len || (pdata->max_len && len > pdata->max_len))
+ goto err;
+ val = malloc(len);
+ if (!val)
+ return -ENOMEM;
+
+ p = arg;
+ for (i = 0; i < len; i++) {
+ uint8_t byte = 0;
+
+ if (!__is_hex(*p))
+ goto err;
+ while (__is_hex(*p))
+ byte = 16 * byte + __hex_val(*p++);
+ if (!__bytestr_delim(p, pdata->delim))
+ goto err;
+ val[i] = byte;
+ if (*p)
+ p++;
+ }
+ ret = type ? ethnla_put(msgbuff, type, len, val) : 0;
+ if (dest) {
+ dest_value->len = len;
+ dest_value->data = val;
+ } else {
+ free(val);
+ }
+ return ret;
+
+err:
+ free(val);
+ fprintf(stderr, "ethtool (%s): invalid value '%s' of parameter '%s'\n",
+ nlctx->cmd, arg, nlctx->param);
+ return -EINVAL;
+}
+
+/* Parser handler for parameters recognized for backward compatibility but
+ * supposed to fail without passing to kernel. Does not generate any netlink
+ * attributes of fill any variable. The @data parameter points to struct
+ * error_parser_params (error message, return value and number of extra
+ * arguments to skip).
+ */
+int nl_parse_error(struct nl_context *nlctx, uint16_t type __maybe_unused,
+ const void *data, struct nl_msg_buff *msgbuff __maybe_unused,
+ void *dest __maybe_unused)
+{
+ const struct error_parser_data *parser_data = data;
+ unsigned int skip = parser_data->extra_args;
+
+ fprintf(stderr, "ethtool (%s): ", nlctx->cmd);
+ fprintf(stderr, parser_data->err_msg, nlctx->param);
+ if (nlctx->argc < skip) {
+ fprintf(stderr, "ethtool (%s): too few arguments for parameter '%s' (expected %u)\n",
+ nlctx->cmd, nlctx->param, skip);
+ } else {
+ nlctx->argp += skip;
+ nlctx->argc -= skip;
+ }
+
+ return parser_data->ret_val;
+}
+
+/* bitset parser handlers */
+
+/* Return true if a bitset argument should be parsed as numeric, i.e.
+ * (a) it starts with '0x'
+ * (b) it consists only of hex digits and at most one slash which can be
+ * optionally followed by "0x"; if no_mask is true, slash is not allowed
+ */
+static bool is_numeric_bitset(const char *arg, bool no_mask)
+{
+ const char *p = arg;
+ bool has_slash = false;
+
+ if (!arg)
+ return false;
+ if (__prefix_0x(arg))
+ return true;
+ while (*p) {
+ if (*p == '/') {
+ if (has_slash || no_mask)
+ return false;
+ has_slash = true;
+ p++;
+ if (__prefix_0x(p))
+ p += 2;
+ continue;
+ }
+ if (!__is_hex(*p))
+ return false;
+ p++;
+ }
+ return true;
+}
+
+#define __MAX_U32_DIGITS 10
+
+/* Parse hex string (without leading "0x") into a bitmap consisting of 32-bit
+ * words. Caller must make sure arg is at least len characters long and dst has
+ * place for at least (len + 7) / 8 32-bit words. If force_hex is false, allow
+ * also base 10 unsigned 32-bit value.
+ *
+ * Returns number of significant bits in the bitmap on success and negative
+ * value on error.
+ */
+static int __parse_num_string(const char *arg, unsigned int len, uint32_t *dst,
+ bool force_hex)
+{
+ char buff[__MAX_U32_DIGITS + 1] = {};
+ unsigned int nbits = 0;
+ const char *p = arg;
+
+ if (!len)
+ return -EINVAL;
+ if (!force_hex && len <= __MAX_U32_DIGITS) {
+ strncpy(buff, arg, len);
+ if (!buff[__MAX_U32_DIGITS]) {
+ u32 val;
+ int ret;
+
+ ret = parse_u32d(buff, &val);
+ if (!ret) {
+ *dst = val;
+ return __nsb(val);
+ }
+ }
+ }
+
+ dst += (len - 1) / 8;
+ while (len > 0) {
+ unsigned int chunk = (len % 8) ?: 8;
+ unsigned long val;
+ char *endp;
+
+ memcpy(buff, p, chunk);
+ buff[chunk] = '\0';
+ val = strtoul(buff, &endp, 16);
+ if (*endp)
+ return -EINVAL;
+ *dst-- = (uint32_t)val;
+ if (nbits)
+ nbits += 4 * chunk;
+ else
+ nbits = __nsb(val);
+
+ p += chunk;
+ len -= chunk;
+ }
+ return nbits;
+}
+
+/* Parse bitset provided as a base 16 numeric value (@no_mask is true) or pair
+ * of base 16 numeric values separated by '/' (@no_mask is false). The "0x"
+ * prefix is optional. Generates bitset nested attribute in compact form.
+ */
+static int parse_numeric_bitset(struct nl_context *nlctx, uint16_t type,
+ bool no_mask, bool force_hex,
+ struct nl_msg_buff *msgbuff)
+{
+ unsigned int nwords, len1, len2;
+ const char *arg = *nlctx->argp;
+ bool force_hex1 = force_hex;
+ bool force_hex2 = force_hex;
+ uint32_t *value = NULL;
+ uint32_t *mask = NULL;
+ struct nlattr *nest;
+ const char *maskptr;
+ int ret = 0;
+ int nbits;
+
+ if (__prefix_0x(arg)) {
+ force_hex1 = true;
+ arg += 2;
+ }
+
+ maskptr = strchr(arg, '/');
+ if (maskptr && no_mask) {
+ parser_err_invalid_value(nlctx, arg);
+ return -EINVAL;
+ }
+ len1 = maskptr ? (unsigned int)(maskptr - arg) : strlen(arg);
+ nwords = DIV_ROUND_UP(len1, 8);
+ nbits = 0;
+
+ if (maskptr) {
+ maskptr++;
+ if (__prefix_0x(maskptr)) {
+ maskptr += 2;
+ force_hex2 = true;
+ }
+ len2 = strlen(maskptr);
+ if (len2 > len1)
+ nwords = DIV_ROUND_UP(len2, 8);
+ mask = calloc(nwords, sizeof(uint32_t));
+ if (!mask)
+ return -ENOMEM;
+ ret = __parse_num_string(maskptr, strlen(maskptr), mask,
+ force_hex2);
+ if (ret < 0) {
+ parser_err_invalid_value(nlctx, arg);
+ goto out_free;
+ }
+ nbits = ret;
+ }
+
+ value = calloc(nwords, sizeof(uint32_t));
+ if (!value) {
+ free(mask);
+ return -ENOMEM;
+ }
+ ret = __parse_num_string(arg, len1, value, force_hex1);
+ if (ret < 0) {
+ parser_err_invalid_value(nlctx, arg);
+ goto out_free;
+ }
+ nbits = (nbits < ret) ? ret : nbits;
+ nwords = (nbits + 31) / 32;
+
+ ret = 0;
+ if (!type)
+ goto out_free;
+ ret = -EMSGSIZE;
+ nest = ethnla_nest_start(msgbuff, type);
+ if (!nest)
+ goto out_free;
+ if (ethnla_put_flag(msgbuff, ETHTOOL_A_BITSET_NOMASK, !mask) ||
+ ethnla_put_u32(msgbuff, ETHTOOL_A_BITSET_SIZE, nbits) ||
+ ethnla_put(msgbuff, ETHTOOL_A_BITSET_VALUE,
+ nwords * sizeof(uint32_t), value) ||
+ (mask &&
+ ethnla_put(msgbuff, ETHTOOL_A_BITSET_MASK,
+ nwords * sizeof(uint32_t), mask)))
+ goto out_free;
+ ethnla_nest_end(msgbuff, nest);
+ ret = 0;
+
+out_free:
+ free(value);
+ free(mask);
+ nlctx->argp++;
+ nlctx->argc--;
+ return ret;
+}
+
+/* Parse bitset provided as series of "name on|off" pairs (@no_mask is false)
+ * or names (@no_mask is true). Generates bitset nested attribute in verbose
+ * form with names from command line.
+ */
+static int parse_name_bitset(struct nl_context *nlctx, uint16_t type,
+ bool no_mask, struct nl_msg_buff *msgbuff)
+{
+ struct nlattr *bitset_attr;
+ struct nlattr *bits_attr;
+ struct nlattr *bit_attr;
+ int ret;
+
+ bitset_attr = ethnla_nest_start(msgbuff, type);
+ if (!bitset_attr)
+ return -EMSGSIZE;
+ ret = -EMSGSIZE;
+ if (no_mask && ethnla_put_flag(msgbuff, ETHTOOL_A_BITSET_NOMASK, true))
+ goto err;
+ bits_attr = ethnla_nest_start(msgbuff, ETHTOOL_A_BITSET_BITS);
+ if (!bits_attr)
+ goto err;
+
+ while (nlctx->argc > 0) {
+ bool bit_val = true;
+
+ if (!strcmp(*nlctx->argp, "--")) {
+ nlctx->argp++;
+ nlctx->argc--;
+ break;
+ }
+ ret = -EINVAL;
+ if (!no_mask) {
+ if (nlctx->argc < 2 ||
+ (strcmp(nlctx->argp[1], "on") &&
+ strcmp(nlctx->argp[1], "off"))) {
+ parser_err_invalid_flag(nlctx, *nlctx->argp);
+ goto err;
+ }
+ bit_val = !strcmp(nlctx->argp[1], "on");
+ }
+
+ ret = -EMSGSIZE;
+ bit_attr = ethnla_nest_start(msgbuff,
+ ETHTOOL_A_BITSET_BITS_BIT);
+ if (!bit_attr)
+ goto err;
+ if (ethnla_put_strz(msgbuff, ETHTOOL_A_BITSET_BIT_NAME,
+ nlctx->argp[0]))
+ goto err;
+ if (!no_mask &&
+ ethnla_put_flag(msgbuff, ETHTOOL_A_BITSET_BIT_VALUE,
+ bit_val))
+ goto err;
+ ethnla_nest_end(msgbuff, bit_attr);
+
+ nlctx->argp += (no_mask ? 1 : 2);
+ nlctx->argc -= (no_mask ? 1 : 2);
+ }
+
+ ethnla_nest_end(msgbuff, bits_attr);
+ ethnla_nest_end(msgbuff, bitset_attr);
+ return 0;
+err:
+ ethnla_nest_cancel(msgbuff, bitset_attr);
+ return ret;
+}
+
+static bool is_char_bitset(const char *arg,
+ const struct char_bitset_parser_data *data)
+{
+ bool mask = (arg[0] == '+' || arg[0] == '-');
+ unsigned int i;
+ const char *p;
+
+ for (p = arg; *p; p++) {
+ if (*p == data->reset_char)
+ continue;
+ if (mask && (*p == '+' || *p == '-'))
+ continue;
+ for (i = 0; i < data->nbits; i++)
+ if (*p == data->bit_chars[i])
+ goto found;
+ return false;
+found:
+ ;
+ }
+
+ return true;
+}
+
+/* Parse bitset provided as a string consisting of characters corresponding to
+ * bit indices. The "reset character" resets the no-mask bitset to empty. If
+ * the first character is '+' or '-', generated bitset has mask and '+' and
+ * '-' switch between enabling and disabling the following bits (i.e. their
+ * value being true/false). In such case, "reset character" is not allowed.
+ */
+static int parse_char_bitset(struct nl_context *nlctx, uint16_t type,
+ const struct char_bitset_parser_data *data,
+ struct nl_msg_buff *msgbuff)
+{
+ const char *arg = *nlctx->argp;
+ struct nlattr *bitset_attr;
+ struct nlattr *saved_pos;
+ struct nlattr *bits_attr;
+ struct nlattr *bit_attr;
+ unsigned int idx;
+ bool val = true;
+ const char *p;
+ bool no_mask;
+ int ret;
+
+ no_mask = data->no_mask || !(arg[0] == '+' || arg[0] == '-');
+ bitset_attr = ethnla_nest_start(msgbuff, type);
+ if (!bitset_attr)
+ return -EMSGSIZE;
+ ret = -EMSGSIZE;
+ if (no_mask && ethnla_put_flag(msgbuff, ETHTOOL_A_BITSET_NOMASK, true))
+ goto err;
+ bits_attr = ethnla_nest_start(msgbuff, ETHTOOL_A_BITSET_BITS);
+ if (!bits_attr)
+ goto err;
+ saved_pos = mnl_nlmsg_get_payload_tail(msgbuff->nlhdr);
+
+ for (p = arg; *p; p++) {
+ if (*p == '+' || *p == '-') {
+ if (no_mask) {
+ parser_err_invalid_value(nlctx, arg);
+ ret = -EINVAL;
+ goto err;
+ }
+ val = (*p == '+');
+ continue;
+ }
+ if (*p == data->reset_char) {
+ if (no_mask) {
+ mnl_attr_nest_cancel(msgbuff->nlhdr, saved_pos);
+ continue;
+ }
+ fprintf(stderr, "ethtool (%s): invalid char '%c' in '%s' for parameter '%s'\n",
+ nlctx->cmd, *p, arg, nlctx->param);
+ ret = -EINVAL;
+ goto err;
+ }
+
+ for (idx = 0; idx < data->nbits; idx++) {
+ if (data->bit_chars[idx] == *p)
+ break;
+ }
+ if (idx >= data->nbits) {
+ fprintf(stderr, "ethtool (%s): invalid char '%c' in '%s' for parameter '%s'\n",
+ nlctx->cmd, *p, arg, nlctx->param);
+ ret = -EINVAL;
+ goto err;
+ }
+ bit_attr = ethnla_nest_start(msgbuff,
+ ETHTOOL_A_BITSET_BITS_BIT);
+ if (!bit_attr)
+ goto err;
+ if (ethnla_put_u32(msgbuff, ETHTOOL_A_BITSET_BIT_INDEX, idx))
+ goto err;
+ if (!no_mask &&
+ ethnla_put_flag(msgbuff, ETHTOOL_A_BITSET_BIT_VALUE, val))
+ goto err;
+ ethnla_nest_end(msgbuff, bit_attr);
+ }
+
+ ethnla_nest_end(msgbuff, bits_attr);
+ ethnla_nest_end(msgbuff, bitset_attr);
+ nlctx->argp++;
+ nlctx->argc--;
+ return 0;
+err:
+ ethnla_nest_cancel(msgbuff, bitset_attr);
+ return ret;
+}
+
+/* Parser handler for bitset. Expects either a numeric value (base 16 or 10
+ * (unless force_hex is set)), optionally followed by '/' and another numeric
+ * value (mask, unless no_mask is set), or a series of "name on|off" pairs
+ * (no_mask not set) or names (no_mask set). In the latter case, names are
+ * passed on as they are and kernel performs their interpretation and
+ * validation. The @data parameter points to struct bitset_parser_data.
+ * Generates only a bitset nested attribute. Fails if @type is zero or @dest
+ * is not null.
+ */
+int nl_parse_bitset(struct nl_context *nlctx, uint16_t type, const void *data,
+ struct nl_msg_buff *msgbuff, void *dest)
+{
+ const struct bitset_parser_data *parser_data = data;
+
+ if (!type || dest) {
+ fprintf(stderr, "ethtool (%s): internal error parsing '%s'\n",
+ nlctx->cmd, nlctx->param);
+ return -EFAULT;
+ }
+ if (is_numeric_bitset(*nlctx->argp, false))
+ return parse_numeric_bitset(nlctx, type, parser_data->no_mask,
+ parser_data->force_hex, msgbuff);
+ else
+ return parse_name_bitset(nlctx, type, parser_data->no_mask,
+ msgbuff);
+}
+
+/* Parser handler for bitset. Expects either a numeric value (base 10 or 16),
+ * optionally followed by '/' and another numeric value (mask, unless no_mask
+ * is set), or a string consisting of characters corresponding to bit indices.
+ * The @data parameter points to struct char_bitset_parser_data. Generates
+ * biset nested attribute. Fails if type is zero or if @dest is not null.
+ */
+int nl_parse_char_bitset(struct nl_context *nlctx, uint16_t type,
+ const void *data, struct nl_msg_buff *msgbuff,
+ void *dest)
+{
+ const struct char_bitset_parser_data *parser_data = data;
+
+ if (!type || dest) {
+ fprintf(stderr, "ethtool (%s): internal error parsing '%s'\n",
+ nlctx->cmd, nlctx->param);
+ return -EFAULT;
+ }
+ if (is_char_bitset(*nlctx->argp, data) ||
+ !is_numeric_bitset(*nlctx->argp, false))
+ return parse_char_bitset(nlctx, type, parser_data, msgbuff);
+ else
+ return parse_numeric_bitset(nlctx, type, parser_data->no_mask,
+ false, msgbuff);
+}
+
+/* parser implementation */
+
+static const struct param_parser *find_parser(const struct param_parser *params,
+ const char *arg)
+{
+ const struct param_parser *parser;
+
+ for (parser = params; parser->arg; parser++)
+ if (!strcmp(arg, parser->arg))
+ return parser;
+ return NULL;
+}
+
+static bool __parser_bit(const uint64_t *map, unsigned int idx)
+{
+ return map[idx / 64] & (1 << (idx % 64));
+}
+
+static void __parser_set(uint64_t *map, unsigned int idx)
+{
+ map[idx / 64] |= (1 << (idx % 64));
+}
+
+static void __parser_set_group(const struct param_parser *params,
+ uint64_t *map, unsigned int alt_group)
+{
+ const struct param_parser *parser;
+ unsigned int idx = 0;
+
+ for (parser = params; parser->arg; parser++, idx++)
+ if (parser->alt_group == alt_group)
+ __parser_set(map, idx);
+}
+
+struct tmp_buff {
+ struct nl_msg_buff *msgbuff;
+ unsigned int id;
+ unsigned int orig_len;
+ struct tmp_buff *next;
+};
+
+static struct tmp_buff *tmp_buff_find(struct tmp_buff *head, unsigned int id)
+{
+ struct tmp_buff *buff;
+
+ for (buff = head; buff; buff = buff->next)
+ if (buff->id == id)
+ break;
+
+ return buff;
+}
+
+static struct tmp_buff *tmp_buff_find_or_create(struct tmp_buff **phead,
+ unsigned int id)
+{
+ struct tmp_buff **pbuff;
+ struct tmp_buff *new_buff;
+
+ for (pbuff = phead; *pbuff; pbuff = &(*pbuff)->next)
+ if ((*pbuff)->id == id)
+ return *pbuff;
+
+ new_buff = malloc(sizeof(*new_buff));
+ if (!new_buff)
+ return NULL;
+ new_buff->id = id;
+ new_buff->msgbuff = malloc(sizeof(*new_buff->msgbuff));
+ if (!new_buff->msgbuff) {
+ free(new_buff);
+ return NULL;
+ }
+ msgbuff_init(new_buff->msgbuff);
+ new_buff->next = NULL;
+ *pbuff = new_buff;
+
+ return new_buff;
+}
+
+static void tmp_buff_destroy(struct tmp_buff *head)
+{
+ struct tmp_buff *buff = head;
+ struct tmp_buff *next;
+
+ while (buff) {
+ next = buff->next;
+ if (buff->msgbuff) {
+ msgbuff_done(buff->msgbuff);
+ free(buff->msgbuff);
+ }
+ free(buff);
+ buff = next;
+ }
+}
+
+/* Main entry point of parser implementation.
+ * @nlctx: netlink context
+ * @params: array of struct param_parser describing expected arguments
+ * and their handlers; the array must be terminated by null
+ * element {}
+ * @dest: optional destination to copy parsed data to (at
+ * param_parser::offset)
+ * @group_style: defines if identifiers in .group represent separate messages,
+ * nested attributes or are not allowed
+ * @msgbuffs: (only used for @group_style = PARSER_GROUP_MSG) array to store
+ * pointers to composed messages; caller must make sure this
+ * array is sufficient, i.e. that it has at least as many entries
+ * as the number of different .group values in params array;
+ * entries are filled from the start, remaining entries are not
+ * modified; caller should zero initialize the array before
+ * calling nl_parser()
+ */
+int nl_parser(struct nl_context *nlctx, const struct param_parser *params,
+ void *dest, enum parser_group_style group_style,
+ struct nl_msg_buff **msgbuffs)
+{
+ struct nl_socket *nlsk = nlctx->ethnl_socket;
+ const struct param_parser *parser;
+ struct tmp_buff *buffs = NULL;
+ unsigned int n_msgbuffs = 0;
+ struct tmp_buff *buff;
+ unsigned int n_params;
+ uint64_t *params_seen;
+ int ret;
+
+ n_params = 0;
+ for (parser = params; parser->arg; parser++) {
+ struct nl_msg_buff *msgbuff;
+ struct nlattr *nest;
+
+ n_params++;
+ if (group_style == PARSER_GROUP_NONE || !parser->group)
+ continue;
+ ret = -ENOMEM;
+ buff = tmp_buff_find_or_create(&buffs, parser->group);
+ if (!buff)
+ goto out_free_buffs;
+ msgbuff = buff->msgbuff;
+ ret = msg_init(nlctx, msgbuff, parser->group,
+ NLM_F_REQUEST | NLM_F_ACK);
+ if (ret < 0)
+ goto out_free_buffs;
+
+ switch (group_style) {
+ case PARSER_GROUP_NEST:
+ ret = -EMSGSIZE;
+ nest = ethnla_nest_start(buff->msgbuff, parser->group);
+ if (!nest)
+ goto out_free_buffs;
+ break;
+ case PARSER_GROUP_MSG:
+ if (ethnla_fill_header(msgbuff,
+ ETHTOOL_A_LINKINFO_HEADER,
+ nlctx->devname, 0))
+ goto out_free_buffs;
+ break;
+ default:
+ break;
+ }
+
+ buff->orig_len = msgbuff_len(msgbuff);
+ }
+ ret = -ENOMEM;
+ params_seen = calloc(DIV_ROUND_UP(n_params, 64), sizeof(uint64_t));
+ if (!params_seen)
+ goto out_free_buffs;
+
+ while (nlctx->argc > 0) {
+ struct nl_msg_buff *msgbuff;
+ void *param_dest;
+
+ nlctx->param = *nlctx->argp;
+ ret = -EINVAL;
+ parser = find_parser(params, nlctx->param);
+ if (!parser) {
+ parser_err_unknown_param(nlctx);
+ goto out_free;
+ }
+
+ /* check duplicates and minimum number of arguments */
+ if (__parser_bit(params_seen, parser - params)) {
+ parser_err_dup_param(nlctx);
+ goto out_free;
+ }
+ nlctx->argc--;
+ nlctx->argp++;
+ if (nlctx->argc < parser->min_argc) {
+ parser_err_min_argc(nlctx, parser->min_argc);
+ goto out_free;
+ }
+ if (parser->alt_group)
+ __parser_set_group(params, params_seen,
+ parser->alt_group);
+ else
+ __parser_set(params_seen, parser - params);
+
+ buff = NULL;
+ if (parser->group)
+ buff = tmp_buff_find(buffs, parser->group);
+ msgbuff = buff ? buff->msgbuff : &nlsk->msgbuff;
+
+ param_dest = dest ? ((char *)dest + parser->dest_offset) : NULL;
+ ret = parser->handler(nlctx, parser->type, parser->handler_data,
+ msgbuff, param_dest);
+ if (ret < 0)
+ goto out_free;
+ }
+
+ if (group_style == PARSER_GROUP_MSG) {
+ ret = -EOPNOTSUPP;
+ for (buff = buffs; buff; buff = buff->next)
+ if (msgbuff_len(buff->msgbuff) > buff->orig_len &&
+ netlink_cmd_check(nlctx->ctx, buff->id, false))
+ goto out_free;
+ }
+ for (buff = buffs; buff; buff = buff->next) {
+ struct nl_msg_buff *msgbuff = buff->msgbuff;
+
+ if (group_style == PARSER_GROUP_NONE ||
+ msgbuff_len(msgbuff) == buff->orig_len)
+ continue;
+ switch (group_style) {
+ case PARSER_GROUP_NEST:
+ ethnla_nest_end(msgbuff, msgbuff->payload);
+ ret = msgbuff_append(&nlsk->msgbuff, msgbuff);
+ if (ret < 0)
+ goto out_free;
+ break;
+ case PARSER_GROUP_MSG:
+ msgbuffs[n_msgbuffs++] = msgbuff;
+ buff->msgbuff = NULL;
+ break;
+ default:
+ break;
+ }
+ }
+
+ ret = 0;
+out_free:
+ free(params_seen);
+out_free_buffs:
+ tmp_buff_destroy(buffs);
+ return ret;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-15 02:56:37 +0000