--- /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(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