+++ /dev/null
-/*
- * m_ematch.c Extended Matches
- *
- * 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 <dlfcn.h>
-#include <stdarg.h>
-#include <errno.h>
-
-#include "utils.h"
-#include "tc_util.h"
-#include "m_ematch.h"
-
-#define EMATCH_MAP "/etc/iproute2/ematch_map"
-
-static struct ematch_util *ematch_list;
-
-/* export to bison parser */
-int ematch_argc;
-char **ematch_argv;
-char *ematch_err = NULL;
-struct ematch *ematch_root;
-
-static int begin_argc;
-static char **begin_argv;
-
-static inline void map_warning(int num, char *kind)
-{
- fprintf(stderr,
- "Error: Unable to find ematch \"%s\" in %s\n" \
- "Please assign a unique ID to the ematch kind the suggested " \
- "entry is:\n" \
- "\t%d\t%s\n",
- kind, EMATCH_MAP, num, kind);
-}
-
-static int lookup_map(__u16 num, char *dst, int len, const char *file)
-{
- int err = -EINVAL;
- char buf[512];
- FILE *fd = fopen(file, "r");
-
- if (fd == NULL)
- return -errno;
-
- while (fgets(buf, sizeof(buf), fd)) {
- char namebuf[512], *p = buf;
- int id;
-
- while (*p == ' ' || *p == '\t')
- p++;
- if (*p == '#' || *p == '\n' || *p == 0)
- continue;
-
- if (sscanf(p, "%d %s", &id, namebuf) != 2) {
- fprintf(stderr, "ematch map %s corrupted at %s\n",
- file, p);
- goto out;
- }
-
- if (id == num) {
- if (dst)
- strncpy(dst, namebuf, len - 1);
- err = 0;
- goto out;
- }
- }
-
- err = -ENOENT;
-out:
- fclose(fd);
- return err;
-}
-
-static int lookup_map_id(char *kind, int *dst, const char *file)
-{
- int err = -EINVAL;
- char buf[512];
- FILE *fd = fopen(file, "r");
-
- if (fd == NULL)
- return -errno;
-
- while (fgets(buf, sizeof(buf), fd)) {
- char namebuf[512], *p = buf;
- int id;
-
- while (*p == ' ' || *p == '\t')
- p++;
- if (*p == '#' || *p == '\n' || *p == 0)
- continue;
-
- if (sscanf(p, "%d %s", &id, namebuf) != 2) {
- fprintf(stderr, "ematch map %s corrupted at %s\n",
- file, p);
- goto out;
- }
-
- if (!strcasecmp(namebuf, kind)) {
- if (dst)
- *dst = id;
- err = 0;
- goto out;
- }
- }
-
- err = -ENOENT;
- *dst = 0;
-out:
- fclose(fd);
- return err;
-}
-
-static struct ematch_util *get_ematch_kind(char *kind)
-{
- static void *body;
- void *dlh;
- char buf[256];
- struct ematch_util *e;
-
- for (e = ematch_list; e; e = e->next) {
- if (strcmp(e->kind, kind) == 0)
- return e;
- }
-
- snprintf(buf, sizeof(buf), "em_%s.so", kind);
- dlh = dlopen(buf, RTLD_LAZY);
- if (dlh == NULL) {
- dlh = body;
- if (dlh == NULL) {
- dlh = body = dlopen(NULL, RTLD_LAZY);
- if (dlh == NULL)
- return NULL;
- }
- }
-
- snprintf(buf, sizeof(buf), "%s_ematch_util", kind);
- e = dlsym(dlh, buf);
- if (e == NULL)
- return NULL;
-
- e->next = ematch_list;
- ematch_list = e;
-
- return e;
-}
-
-static struct ematch_util *get_ematch_kind_num(__u16 kind)
-{
- char name[32];
-
- if (lookup_map(kind, name, sizeof(name), EMATCH_MAP) < 0)
- return NULL;
-
- return get_ematch_kind(name);
-
- return NULL;
-}
-
-static int parse_tree(struct nlmsghdr *n, struct ematch *tree)
-{
- int index = 1;
- struct ematch *t;
-
- for (t = tree; t; t = t->next) {
- struct rtattr *tail = NLMSG_TAIL(n);
- struct tcf_ematch_hdr hdr = {
- .flags = t->relation
- };
-
- if (t->inverted)
- hdr.flags |= TCF_EM_INVERT;
-
- addattr_l(n, MAX_MSG, index++, NULL, 0);
-
- if (t->child) {
- __u32 r = t->child_ref;
- addraw_l(n, MAX_MSG, &hdr, sizeof(hdr));
- addraw_l(n, MAX_MSG, &r, sizeof(r));
- } else {
- int num = 0, err;
- char buf[64];
- struct ematch_util *e;
-
- if (t->args == NULL)
- return -1;
-
- strncpy(buf, (char*) t->args->data, sizeof(buf)-1);
- e = get_ematch_kind(buf);
- if (e == NULL) {
- fprintf(stderr, "Unknown ematch \"%s\"\n",
- buf);
- return -1;
- }
-
- err = lookup_map_id(buf, &num, EMATCH_MAP);
- if (err < 0) {
- if (err == -ENOENT)
- map_warning(e->kind_num, buf);
- return err;
- }
-
- hdr.kind = num;
- if (e->parse_eopt(n, &hdr, t->args->next) < 0)
- return -1;
- }
-
- tail->rta_len = (void*) NLMSG_TAIL(n) - (void*) tail;
- }
-
- return 0;
-}
-
-static int flatten_tree(struct ematch *head, struct ematch *tree)
-{
- int i, count = 0;
- struct ematch *t;
-
- for (;;) {
- count++;
-
- if (tree->child) {
- for (t = head; t->next; t = t->next);
- t->next = tree->child;
- count += flatten_tree(head, tree->child);
- }
-
- if (tree->relation == 0)
- break;
-
- tree = tree->next;
- }
-
- for (i = 0, t = head; t; t = t->next, i++)
- t->index = i;
-
- for (t = head; t; t = t->next)
- if (t->child)
- t->child_ref = t->child->index;
-
- return count;
-}
-
-int em_parse_error(int err, struct bstr *args, struct bstr *carg,
- struct ematch_util *e, char *fmt, ...)
-{
- va_list a;
-
- va_start(a, fmt);
- vfprintf(stderr, fmt, a);
- va_end(a);
-
- if (ematch_err)
- fprintf(stderr, ": %s\n... ", ematch_err);
- else
- fprintf(stderr, "\n... ");
-
- while (ematch_argc < begin_argc) {
- if (ematch_argc == (begin_argc - 1))
- fprintf(stderr, ">>%s<< ", *begin_argv);
- else
- fprintf(stderr, "%s ", *begin_argv);
- begin_argv++;
- begin_argc--;
- }
-
- fprintf(stderr, "...\n");
-
- if (args) {
- fprintf(stderr, "... %s(", e->kind);
- while (args) {
- fprintf(stderr, "%s", args == carg ? ">>" : "");
- bstr_print(stderr, args, 1);
- fprintf(stderr, "%s%s", args == carg ? "<<" : "",
- args->next ? " " : "");
- args = args->next;
- }
- fprintf(stderr, ")...\n");
-
- }
-
- if (e == NULL) {
- fprintf(stderr,
- "Usage: EXPR\n" \
- "where: EXPR := TERM [ { and | or } EXPR ]\n" \
- " TERM := [ not ] { MATCH | '(' EXPR ')' }\n" \
- " MATCH := module '(' ARGS ')'\n" \
- " ARGS := ARG1 ARG2 ...\n" \
- "\n" \
- "Example: a(x y) and not (b(x) or c(x y z))\n");
- } else
- e->print_usage(stderr);
-
- return -err;
-}
-
-static inline void free_ematch_err(void)
-{
- if (ematch_err) {
- free(ematch_err);
- ematch_err = NULL;
- }
-}
-
-extern int ematch_parse(void);
-
-int parse_ematch(int *argc_p, char ***argv_p, int tca_id, struct nlmsghdr *n)
-{
- begin_argc = ematch_argc = *argc_p;
- begin_argv = ematch_argv = *argv_p;
-
- if (ematch_parse()) {
- int err = em_parse_error(EINVAL, NULL, NULL, NULL,
- "Parse error");
- free_ematch_err();
- return err;
- }
-
- free_ematch_err();
-
- /* undo look ahead by parser */
- ematch_argc++;
- ematch_argv--;
-
- if (ematch_root) {
- struct rtattr *tail, *tail_list;
-
- struct tcf_ematch_tree_hdr hdr = {
- .nmatches = flatten_tree(ematch_root, ematch_root),
- .progid = TCF_EM_PROG_TC
- };
-
- tail = NLMSG_TAIL(n);
- addattr_l(n, MAX_MSG, tca_id, NULL, 0);
- addattr_l(n, MAX_MSG, TCA_EMATCH_TREE_HDR, &hdr, sizeof(hdr));
-
- tail_list = NLMSG_TAIL(n);
- addattr_l(n, MAX_MSG, TCA_EMATCH_TREE_LIST, NULL, 0);
-
- if (parse_tree(n, ematch_root) < 0)
- return -1;
-
- tail_list->rta_len = (void*) NLMSG_TAIL(n) - (void*) tail_list;
- tail->rta_len = (void*) NLMSG_TAIL(n) - (void*) tail;
- }
-
- *argc_p = ematch_argc;
- *argv_p = ematch_argv;
-
- return 0;
-}
-
-static int print_ematch_seq(FILE *fd, struct rtattr **tb, int start,
- int prefix)
-{
- int n, i = start;
- struct tcf_ematch_hdr *hdr;
- int dlen;
- void *data;
-
- for (;;) {
- if (tb[i] == NULL)
- return -1;
-
- dlen = RTA_PAYLOAD(tb[i]) - sizeof(*hdr);
- data = (void *) RTA_DATA(tb[i]) + sizeof(*hdr);
-
- if (dlen < 0)
- return -1;
-
- hdr = RTA_DATA(tb[i]);
-
- if (hdr->flags & TCF_EM_INVERT)
- fprintf(fd, "NOT ");
-
- if (hdr->kind == 0) {
- __u32 ref;
-
- if (dlen < sizeof(__u32))
- return -1;
-
- ref = *(__u32 *) data;
- fprintf(fd, "(\n");
- for (n = 0; n <= prefix; n++)
- fprintf(fd, " ");
- if (print_ematch_seq(fd, tb, ref + 1, prefix + 1) < 0)
- return -1;
- for (n = 0; n < prefix; n++)
- fprintf(fd, " ");
- fprintf(fd, ") ");
-
- } else {
- struct ematch_util *e;
-
- e = get_ematch_kind_num(hdr->kind);
- if (e == NULL)
- fprintf(fd, "[unknown ematch %d]\n",
- hdr->kind);
- else {
- fprintf(fd, "%s(", e->kind);
- if (e->print_eopt(fd, hdr, data, dlen) < 0)
- return -1;
- fprintf(fd, ")\n");
- }
- if (hdr->flags & TCF_EM_REL_MASK)
- for (n = 0; n < prefix; n++)
- fprintf(fd, " ");
- }
-
- switch (hdr->flags & TCF_EM_REL_MASK) {
- case TCF_EM_REL_AND:
- fprintf(fd, "AND ");
- break;
-
- case TCF_EM_REL_OR:
- fprintf(fd, "OR ");
- break;
-
- default:
- return 0;
- }
-
- i++;
- }
-
- return 0;
-}
-
-static int print_ematch_list(FILE *fd, struct tcf_ematch_tree_hdr *hdr,
- struct rtattr *rta)
-{
- int err = -1;
- struct rtattr **tb;
-
- tb = malloc((hdr->nmatches + 1) * sizeof(struct rtattr *));
- if (tb == NULL)
- return -1;
-
- if (parse_rtattr_nested(tb, hdr->nmatches, rta) < 0)
- goto errout;
-
- fprintf(fd, "\n ");
- if (print_ematch_seq(fd, tb, 1, 1) < 0)
- goto errout;
-
- err = 0;
-errout:
- free(tb);
- return err;
-}
-
-int print_ematch(FILE *fd, const struct rtattr *rta)
-{
- struct rtattr *tb[TCA_EMATCH_TREE_MAX+1];
- struct tcf_ematch_tree_hdr *hdr;
-
- if (parse_rtattr_nested(tb, TCA_EMATCH_TREE_MAX, rta) < 0)
- return -1;
-
- if (tb[TCA_EMATCH_TREE_HDR] == NULL) {
- fprintf(stderr, "Missing ematch tree header\n");
- return -1;
- }
-
- if (tb[TCA_EMATCH_TREE_LIST] == NULL) {
- fprintf(stderr, "Missing ematch tree list\n");
- return -1;
- }
-
- if (RTA_PAYLOAD(tb[TCA_EMATCH_TREE_HDR]) < sizeof(*hdr)) {
- fprintf(stderr, "Ematch tree header size mismatch\n");
- return -1;
- }
-
- hdr = RTA_DATA(tb[TCA_EMATCH_TREE_HDR]);
-
- return print_ematch_list(fd, hdr, tb[TCA_EMATCH_TREE_LIST]);
-}
git://git.onelab.eu / iproute2.git / blobdiff