+++ /dev/null
-/*
- * m_pedit.c generic packet editor actions module
- *
- * 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: J Hadi Salim (hadi@cyberus.ca)
- *
- * TODO:
- * 1) Big endian broken in some spots
- * 2) A lot of this stuff was added on the fly; get a big double-double
- * and clean it up at some point.
- *
- */
-
-#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 "utils.h"
-#include "tc_util.h"
-#include "m_pedit.h"
-
-static struct m_pedit_util *pedit_list;
-int pedit_debug = 1;
-
-static void
-p_explain(void)
-{
- fprintf(stderr, "Usage: ... pedit <MUNGE>\n");
- fprintf(stderr,
- "Where: MUNGE := <RAW>|<LAYERED>\n"
- "<RAW>:= <OFFSETC>[ATC]<CMD>\n "
- "OFFSETC:= offset <offval> <u8|u16|u32>\n "
- "ATC:= at <atval> offmask <maskval> shift <shiftval>\n "
- "NOTE: offval is byte offset, must be multiple of 4\n "
- "NOTE: maskval is a 32 bit hex number\n "
- "NOTE: shiftval is a is a shift value\n "
- "CMD:= clear | invert | set <setval>| retain\n "
- "<LAYERED>:= ip <ipdata> | ip6 <ip6data> \n "
- " | udp <udpdata> | tcp <tcpdata> | icmp <icmpdata> \n"
- "For Example usage look at the examples directory");
-
-}
-
-#define usage() return(-1)
-
-static int
-pedit_parse_nopopt (int *argc_p, char ***argv_p,struct tc_pedit_sel *sel,struct tc_pedit_key *tkey)
-{
- int argc = *argc_p;
- char **argv = *argv_p;
-
- if (argc) {
- fprintf(stderr, "Unknown action hence option \"%s\" is unparsable\n", *argv);
- return -1;
- }
-
- return 0;
-
-}
-
-struct m_pedit_util
-*get_pedit_kind(char *str)
-{
- static void *pBODY;
- void *dlh;
- char buf[256];
- struct m_pedit_util *p;
-
- for (p = pedit_list; p; p = p->next) {
- if (strcmp(p->id, str) == 0)
- return p;
- }
-
- snprintf(buf, sizeof(buf), "p_%s.so", str);
- dlh = dlopen(buf, RTLD_LAZY);
- if (dlh == NULL) {
- dlh = pBODY;
- if (dlh == NULL) {
- dlh = pBODY = dlopen(NULL, RTLD_LAZY);
- if (dlh == NULL)
- goto noexist;
- }
- }
-
- snprintf(buf, sizeof(buf), "p_pedit_%s", str);
- p = dlsym(dlh, buf);
- if (p == NULL)
- goto noexist;
-
-reg:
- p->next = pedit_list;
- pedit_list = p;
- return p;
-
-noexist:
- p = malloc(sizeof(*p));
- if (p) {
- memset(p, 0, sizeof(*p));
- strncpy(p->id, str, sizeof(p->id)-1);
- p->parse_peopt = pedit_parse_nopopt;
- goto reg;
- }
- return p;
-}
-
-int
-pack_key(struct tc_pedit_sel *sel,struct tc_pedit_key *tkey)
-{
- int hwm = sel->nkeys;
-
- if (hwm >= MAX_OFFS)
- return -1;
-
- if (tkey->off % 4) {
- fprintf(stderr, "offsets MUST be in 32 bit boundaries\n");
- return -1;
- }
-
- sel->keys[hwm].val = tkey->val;
- sel->keys[hwm].mask = tkey->mask;
- sel->keys[hwm].off = tkey->off;
- sel->keys[hwm].at = tkey->at;
- sel->keys[hwm].offmask = tkey->offmask;
- sel->keys[hwm].shift = tkey->shift;
- sel->nkeys++;
- return 0;
-}
-
-
-int
-pack_key32(__u32 retain,struct tc_pedit_sel *sel,struct tc_pedit_key *tkey)
-{
- if (tkey->off > (tkey->off & ~3)) {
- fprintf(stderr,
- "pack_key32: 32 bit offsets must begin in 32bit boundaries\n");
- return -1;
- }
-
- tkey->val = htonl(tkey->val & retain);
- tkey->mask = htonl(tkey->mask | ~retain);
- /* jamal remove this - it is not necessary given the if check above */
- tkey->off &= ~3;
- return pack_key(sel,tkey);
-}
-
-int
-pack_key16(__u32 retain,struct tc_pedit_sel *sel,struct tc_pedit_key *tkey)
-{
- int ind = 0, stride = 0;
- __u32 m[4] = {0xFFFF0000,0xFF0000FF,0x0000FFFF};
-
- if (0 > tkey->off) {
- ind = tkey->off + 1;
- if (0 > ind)
- ind = -1*ind;
- } else {
- ind = tkey->off;
- }
-
- if (tkey->val > 0xFFFF || tkey->mask > 0xFFFF) {
- fprintf(stderr, "pack_key16 bad value\n");
- return -1;
- }
-
- ind = tkey->off & 3;
-
- if (0 > ind || 2 < ind) {
- fprintf(stderr, "pack_key16 bad index value %d\n",ind);
- return -1;
- }
-
- stride = 8 * ind;
- tkey->val = htons(tkey->val);
- if (stride > 0) {
- tkey->val <<= stride;
- tkey->mask <<= stride;
- retain <<= stride;
- }
- tkey->mask = retain|m[ind];
-
- tkey->off &= ~3;
-
- if (pedit_debug)
- printf("pack_key16: Final val %08x mask %08x \n",tkey->val,tkey->mask);
- return pack_key(sel,tkey);
-
-}
-
-int
-pack_key8(__u32 retain,struct tc_pedit_sel *sel,struct tc_pedit_key *tkey)
-{
- int ind = 0, stride = 0;
- __u32 m[4] = {0xFFFFFF00,0xFFFF00FF,0xFF00FFFF,0x00FFFFFF};
-
- if (0 > tkey->off) {
- ind = tkey->off + 1;
- if (0 > ind)
- ind = -1*ind;
- } else {
- ind = tkey->off;
- }
-
- if (tkey->val > 0xFF || tkey->mask > 0xFF) {
- fprintf(stderr, "pack_key8 bad value (val %x mask %x\n", tkey->val, tkey->mask);
- return -1;
- }
-
- ind = tkey->off & 3;
- stride = 8 * ind;
- tkey->val <<= stride;
- tkey->mask <<= stride;
- retain <<= stride;
- tkey->mask = retain|m[ind];
- tkey->off &= ~3;
-
- if (pedit_debug)
- printf("pack_key8: Final word off %d val %08x mask %08x \n",tkey->off , tkey->val,tkey->mask);
- return pack_key(sel,tkey);
-}
-
-int
-parse_val(int *argc_p, char ***argv_p, __u32 * val, int type)
-{
- int argc = *argc_p;
- char **argv = *argv_p;
-
- if (argc <= 0)
- return -1;
-
- if (TINT == type)
- return get_integer((int *) val, *argv, 0);
-
- if (TU32 == type)
- return get_u32(val, *argv, 0);
-
- if (TIPV4 == type) {
- inet_prefix addr;
- if (get_prefix_1(&addr, *argv, AF_INET)) {
- return -1;
- }
- *val=addr.data[0];
- return 0;
- }
- if (TIPV6 == type) {
- /* not implemented yet */
- return -1;
- }
-
- return -1;
-}
-
-int
-parse_cmd(int *argc_p, char ***argv_p, __u32 len, int type,__u32 retain,struct tc_pedit_sel *sel,struct tc_pedit_key *tkey)
-{
- __u32 mask = 0, val = 0;
- __u32 o = 0xFF;
- int res = -1;
- int argc = *argc_p;
- char **argv = *argv_p;
-
- if (argc <= 0)
- return -1;
-
- if (pedit_debug)
- printf("parse_cmd argc %d %s offset %d length %d\n",argc,*argv,tkey->off,len);
-
- if (len == 2)
- o = 0xFFFF;
- if (len == 4)
- o = 0xFFFFFFFF;
-
- if (matches(*argv, "invert") == 0) {
- retain = val = mask = o;
- } else if (matches(*argv, "set") == 0) {
- NEXT_ARG();
- if (parse_val(&argc, &argv, &val, type))
- return -1;
- } else if (matches(*argv, "preserve") == 0) {
- retain = mask = o;
- } else {
- if (matches(*argv, "clear") != 0)
- return -1;
- }
-
- argc--; argv++;
-
- if (argc && matches(*argv, "retain") == 0) {
- NEXT_ARG();
- if (parse_val(&argc, &argv, &retain, TU32))
- return -1;
- argc--; argv++;
- }
-
- tkey->val = val;
-
- if (len == 1) {
- tkey->mask = 0xFF;
- res = pack_key8(retain,sel,tkey);
- goto done;
- }
- if (len == 2) {
- tkey->mask = mask;
- res = pack_key16(retain,sel,tkey);
- goto done;
- }
- if (len == 4) {
- tkey->mask = mask;
- res = pack_key32(retain,sel,tkey);
- goto done;
- }
-
- return -1;
-done:
- if (pedit_debug)
- printf("parse_cmd done argc %d %s offset %d length %d\n",argc,*argv,tkey->off,len);
- *argc_p = argc;
- *argv_p = argv;
- return res;
-
-}
-
-int
-parse_offset(int *argc_p, char ***argv_p,struct tc_pedit_sel *sel,struct tc_pedit_key *tkey)
-{
- int off;
- __u32 len, retain;
- int argc = *argc_p;
- char **argv = *argv_p;
- int res = -1;
-
- if (argc <= 0)
- return -1;
-
- if (get_integer(&off, *argv, 0))
- return -1;
- tkey->off = off;
-
- argc--;
- argv++;
-
- if (argc <= 0)
- return -1;
-
-
- if (matches(*argv, "u32") == 0) {
- len = 4;
- retain = 0xFFFFFFFF;
- goto done;
- }
- if (matches(*argv, "u16") == 0) {
- len = 2;
- retain = 0x0;
- goto done;
- }
- if (matches(*argv, "u8") == 0) {
- len = 1;
- retain = 0x0;
- goto done;
- }
-
- return -1;
-
-done:
-
- NEXT_ARG();
-
- /* [at <someval> offmask <maskval> shift <shiftval>] */
- if (matches(*argv, "at") == 0) {
-
- __u32 atv=0,offmask=0x0,shift=0;
-
- NEXT_ARG();
- if (get_u32(&atv, *argv, 0))
- return -1;
- tkey->at = atv;
-
- NEXT_ARG();
-
- if (get_u32(&offmask, *argv, 16))
- return -1;
- tkey->offmask = offmask;
-
- NEXT_ARG();
-
- if (get_u32(&shift, *argv, 0))
- return -1;
- tkey->shift = shift;
-
- NEXT_ARG();
- }
-
- res = parse_cmd(&argc, &argv, len, TU32,retain,sel,tkey);
-
- *argc_p = argc;
- *argv_p = argv;
- return res;
-}
-
-int
-parse_munge(int *argc_p, char ***argv_p,struct tc_pedit_sel *sel)
-{
- struct tc_pedit_key tkey;
- int argc = *argc_p;
- char **argv = *argv_p;
- int res = -1;
-
- if (argc <= 0)
- return -1;
-
- memset(&tkey, 0, sizeof(tkey));
-
- if (matches(*argv, "offset") == 0) {
- NEXT_ARG();
- res = parse_offset(&argc, &argv,sel,&tkey);
- goto done;
-#if jamal
- } else if (strcmp(*argv, "help") == 0) {
- p_explain();
- return -1;
-#endif
- } else {
- char k[16];
- struct m_pedit_util *p = NULL;
-
- strncpy(k, *argv, sizeof (k) - 1);
-
- if (argc > 0 ) {
- p = get_pedit_kind(k);
- if (NULL == p)
- goto bad_val;
- res = p->parse_peopt(&argc, &argv, sel,&tkey);
- if (res < 0) {
- fprintf(stderr,"bad pedit parsing\n");
- goto bad_val;
- }
- goto done;
- }
- }
-
-bad_val:
- return -1;
-
-done:
-
- *argc_p = argc;
- *argv_p = argv;
- return res;
-}
-
-int
-parse_pedit(struct action_util *a, int *argc_p, char ***argv_p, int tca_id, struct nlmsghdr *n)
-{
- struct {
- struct tc_pedit_sel sel;
- struct tc_pedit_key keys[MAX_OFFS];
- } sel;
-
- int argc = *argc_p;
- char **argv = *argv_p;
- int ok = 0, iok = 0;
- struct rtattr *tail;
-
- memset(&sel, 0, sizeof(sel));
-
- while (argc > 0) {
- if (pedit_debug > 1)
- fprintf(stderr, "while pedit (%d:%s)\n",argc, *argv);
- if (matches(*argv, "pedit") == 0) {
- NEXT_ARG();
- ok++;
- continue;
- } else if (matches(*argv, "munge") == 0) {
- if (!ok) {
- fprintf(stderr, "Illegal pedit construct (%s) \n", *argv);
- p_explain();
- return -1;
- }
- NEXT_ARG();
- if (parse_munge(&argc, &argv,&sel.sel)) {
- fprintf(stderr, "Illegal pedit construct (%s) \n", *argv);
- p_explain();
- return -1;
- }
- ok++;
- } else {
- break;
- }
-
- }
-
- if (!ok) {
- p_explain();
- return -1;
- }
-
- if (argc) {
- if (matches(*argv, "reclassify") == 0) {
- sel.sel.action = TC_ACT_RECLASSIFY;
- NEXT_ARG();
- } else if (matches(*argv, "pipe") == 0) {
- sel.sel.action = TC_ACT_PIPE;
- NEXT_ARG();
- } else if (matches(*argv, "drop") == 0 ||
- matches(*argv, "shot") == 0) {
- sel.sel.action = TC_ACT_SHOT;
- NEXT_ARG();
- } else if (matches(*argv, "continue") == 0) {
- sel.sel.action = TC_ACT_UNSPEC;
- NEXT_ARG();
- } else if (matches(*argv, "pass") == 0) {
- sel.sel.action = TC_ACT_OK;
- NEXT_ARG();
- }
- }
-
- if (argc) {
- if (matches(*argv, "index") == 0) {
- NEXT_ARG();
- if (get_u32(&sel.sel.index, *argv, 10)) {
- fprintf(stderr, "Pedit: Illegal \"index\"\n");
- return -1;
- }
- argc--;
- argv++;
- iok++;
- }
- }
-
- tail = NLMSG_TAIL(n);
- addattr_l(n, MAX_MSG, tca_id, NULL, 0);
- addattr_l(n, MAX_MSG, TCA_PEDIT_PARMS,&sel, sizeof(sel.sel)+sel.sel.nkeys*sizeof(struct tc_pedit_key));
- tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
-
- *argc_p = argc;
- *argv_p = argv;
- return 0;
-}
-
-int
-print_pedit(struct action_util *au,FILE * f, struct rtattr *arg)
-{
- struct tc_pedit_sel *sel;
- struct rtattr *tb[TCA_PEDIT_MAX + 1];
- SPRINT_BUF(b1);
-
- if (arg == NULL)
- return -1;
-
- parse_rtattr_nested(tb, TCA_PEDIT_MAX, arg);
-
- if (tb[TCA_PEDIT_PARMS] == NULL) {
- fprintf(f, "[NULL pedit parameters]");
- return -1;
- }
- sel = RTA_DATA(tb[TCA_PEDIT_PARMS]);
-
- fprintf(f, " pedit action %s keys %d\n ", action_n2a(sel->action, b1, sizeof (b1)),sel->nkeys);
- fprintf(f, "\t index %d ref %d bind %d", sel->index,sel->refcnt, sel->bindcnt);
-
- if (show_stats) {
- if (tb[TCA_PEDIT_TM]) {
- struct tcf_t *tm = RTA_DATA(tb[TCA_PEDIT_TM]);
- print_tm(f,tm);
- }
- }
- if (sel->nkeys) {
- int i;
- struct tc_pedit_key *key = sel->keys;
-
- for (i=0; i<sel->nkeys; i++, key++) {
- fprintf(f, "\n\t key #%d",i);
- fprintf(f, " at %d: val %08x mask %08x",
- (unsigned int)key->off,
- (unsigned int)ntohl(key->val),
- (unsigned int)ntohl(key->mask));
- }
- } else {
- fprintf(f, "\npedit %x keys %d is not LEGIT", sel->index,sel->nkeys);
- }
-
-
- fprintf(f, "\n ");
- return 0;
-}
-
-int
-pedit_print_xstats(struct action_util *au, FILE *f, struct rtattr *xstats)
-{
- return 0;
-}
-
-struct action_util pedit_action_util = {
- .id = "pedit",
- .parse_aopt = parse_pedit,
- .print_aopt = print_pedit,
-};
git://git.onelab.eu / iproute2.git / blobdiff