iptc_zero_counter/ip6tc_zero_counter are functions available in libiptc to zero counters for a rule in a given chain. However, this is not exposed in iptables/ip6tables. The patch below exposes the underlying function to the user to zero out packet and byte counters for a specific rule.
build-vm-jenner:/jenner/pkgs/iptables# git diff -u 039683e8958bb161d3eaece4853898ee575bc0f5 iptables.c ip6tables.c
diff --git a/ip6tables.c b/ip6tables.c
index e146114..22612b6 100644
--- a/ip6tables.c
+++ b/ip6tables.c
@@ -79,9 +79,10 @@
#define CMD_SET_POLICY 0x0400U
#define CMD_RENAME_CHAIN 0x0800U
#define CMD_LIST_RULES 0x1000U
-#define NUMBER_OF_CMD 14
+#define CMD_ZERO_NUM 0x2000U
+#define NUMBER_OF_CMD 15
static const char cmdflags[] = { 'I', 'D', 'D', 'R', 'A', 'L', 'F', 'Z',
- 'N', 'X', 'P', 'E', 'S' };
+ 'Z', 'N', 'X', 'P', 'E', 'S' };
#define OPTION_OFFSET 256
@@ -165,6 +166,7 @@ static char commands_v_options[NUMBER_OF_CMD][NUMBER_OF_OPT] =
/*LIST*/ {' ','x','x','x','x',' ',' ','x','x',' ','x'},
/*FLUSH*/ {'x','x','x','x','x',' ','x','x','x','x','x'},
/*ZERO*/ {'x','x','x','x','x',' ','x','x','x','x','x'},
+/*ZERO_NUM*/ {'x','x','x','x','x',' ','x','x','x','x','x'},
/*NEW_CHAIN*/ {'x','x','x','x','x',' ','x','x','x','x','x'},
/*DEL_CHAIN*/ {'x','x','x','x','x',' ','x','x','x','x','x'},
/*SET_POLICY*/{'x','x','x','x','x',' ','x','x','x','x',' '},
@@ -308,7 +310,8 @@ exit_printhelp(struct ip6tables_rule_match *matches)
" --list-rules -S [chain [rulenum]]\n"
" Print the rules in a chain or all chains\n"
" --flush -F [chain] Delete all rules in chain or all chains\n"
-" --zero -Z [chain] Zero counters in chain or all chains\n"
+" --zero -Z [chain[rulenum]]\n"
+" Zero counters in chain or all chains\n"
" --new -N chain Create a new user-defined chain\n"
" --delete-chain\n"
" -X [chain] Delete a user-defined chain\n"
@@ -1494,7 +1497,7 @@ int do_command6(int argc, char *argv[], char **table, ip6tc_handle_t *handle)
break;
case 'L':
- add_command(&command, CMD_LIST, CMD_ZERO,
+ add_command(&command, CMD_LIST, CMD_ZERO|CMD_ZERO_NUM,
invert);
if (optarg) chain = optarg;
else if (optind < argc && argv[optind][0] != '-'
@@ -1506,8 +1509,8 @@ int do_command6(int argc, char *argv[], char **table, ip6tc_handle_t *handle)
break;
case 'S':
- add_command(&command, CMD_LIST_RULES, CMD_ZERO,
- invert);
+ add_command(&command, CMD_LIST_RULES,
+ CMD_ZERO|CMD_ZERO_NUM, invert);
if (optarg) chain = optarg;
else if (optind < argc && argv[optind][0] != '-'
&& argv[optind][0] != '!')
@@ -1533,6 +1536,11 @@ int do_command6(int argc, char *argv[], char **table, ip6tc_handle_t *handle)
else if (optind < argc && argv[optind][0] != '-'
&& argv[optind][0] != '!')
chain = argv[optind++];
+ if (optind < argc && argv[optind][0] != '-'
+ && argv[optind][0] != '!') {
+ rulenum = parse_rulenumber(argv[optind++]);
+ command = CMD_ZERO_NUM;
+ }
break;
case 'N':
@@ -2035,8 +2043,12 @@ int do_command6(int argc, char *argv[], char **table, ip6tc_handle_t *handle)
case CMD_ZERO:
ret = zero_entries(chain, options&OPT_VERBOSE, handle);
break;
+ case CMD_ZERO_NUM:
+ ret = ip6tc_zero_counter(chain, rulenum, handle);
+ break;
case CMD_LIST:
case CMD_LIST|CMD_ZERO:
+ case CMD_LIST|CMD_ZERO_NUM:
ret = list_entries(chain,
rulenum,
options&OPT_VERBOSE,
@@ -2047,9 +2059,12 @@ int do_command6(int argc, char *argv[], char **table, ip6tc_handle_t *handle)
if (ret && (command & CMD_ZERO))
ret = zero_entries(chain,
options&OPT_VERBOSE, handle);
+ if (ret && (command & CMD_ZERO_NUM))
+ ret = ip6tc_zero_counter(chain, rulenum, handle);
break;
case CMD_LIST_RULES:
case CMD_LIST_RULES|CMD_ZERO:
+ case CMD_LIST_RULES|CMD_ZERO_NUM:
ret = list_rules(chain,
rulenum,
options&OPT_VERBOSE,
@@ -2057,6 +2072,8 @@ int do_command6(int argc, char *argv[], char **table, ip6tc_handle_t *handle)
if (ret && (command & CMD_ZERO))
ret = zero_entries(chain,
options&OPT_VERBOSE, handle);
+ if (ret && (command & CMD_ZERO_NUM))
+ ret = ip6tc_zero_counter(chain, rulenum, handle);
break;
case CMD_NEW_CHAIN:
ret = ip6tc_create_chain(chain, handle);
diff --git a/iptables.c b/iptables.c
index bf3cbca..4e67925 100644
--- a/iptables.c
+++ b/iptables.c
@@ -76,9 +76,10 @@
#define CMD_SET_POLICY 0x0400U
#define CMD_RENAME_CHAIN 0x0800U
#define CMD_LIST_RULES 0x1000U
-#define NUMBER_OF_CMD 14
+#define CMD_ZERO_NUM 0x2000U
+#define NUMBER_OF_CMD 15
static const char cmdflags[] = { 'I', 'D', 'D', 'R', 'A', 'L', 'F', 'Z',
- 'N', 'X', 'P', 'E', 'S' };
+ 'Z', 'N', 'X', 'P', 'E', 'S' };
#define OPTION_OFFSET 256
@@ -165,6 +166,7 @@ static char commands_v_options[NUMBER_OF_CMD][NUMBER_OF_OPT] =
/*LIST*/ {' ','x','x','x','x',' ',' ','x','x','x',' ','x'},
/*FLUSH*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'},
/*ZERO*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'},
+/*ZERO_NUM*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'},
/*NEW_CHAIN*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'},
/*DEL_CHAIN*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'},
/*SET_POLICY*/{'x','x','x','x','x',' ','x','x','x','x','x',' '},
@@ -311,7 +313,8 @@ exit_printhelp(struct iptables_rule_match *matches)
" --list-rules -S [chain [rulenum]]\n"
" Print the rules in a chain or all chains\n"
" --flush -F [chain] Delete all rules in chain or all chains\n"
-" --zero -Z [chain] Zero counters in chain or all chains\n"
+" --zero -Z [chain [rulenum]]\n"
+" Zero counters in chain or all chains\n"
" --new -N chain Create a new user-defined chain\n"
" --delete-chain\n"
" -X [chain] Delete a user-defined chain\n"
@@ -1521,7 +1524,7 @@ int do_command(int argc, char *argv[], char **table, iptc_handle_t *handle)
break;
case 'L':
- add_command(&command, CMD_LIST, CMD_ZERO,
+ add_command(&command, CMD_LIST, CMD_ZERO|CMD_ZERO_NUM,
invert);
if (optarg) chain = optarg;
else if (optind < argc && argv[optind][0] != '-'
@@ -1533,8 +1536,8 @@ int do_command(int argc, char *argv[], char **table, iptc_handle_t *handle)
break;
case 'S':
- add_command(&command, CMD_LIST_RULES, CMD_ZERO,
- invert);
+ add_command(&command, CMD_LIST_RULES,
+ CMD_ZERO|CMD_ZERO_NUM, invert);
if (optarg) chain = optarg;
else if (optind < argc && argv[optind][0] != '-'
&& argv[optind][0] != '!')
@@ -1560,6 +1563,11 @@ int do_command(int argc, char *argv[], char **table, iptc_handle_t *handle)
else if (optind < argc && argv[optind][0] != '-'
&& argv[optind][0] != '!')
chain = argv[optind++];
+ if (optind < argc && argv[optind][0] != '-'
+ && argv[optind][0] != '!') {
+ rulenum = parse_rulenumber(argv[optind++]);
+ command = CMD_ZERO_NUM;
+ }
break;
case 'N':
@@ -2087,8 +2095,12 @@ int do_command(int argc, char *argv[], char **table, iptc_handle_t *handle)
case CMD_ZERO:
ret = zero_entries(chain, options&OPT_VERBOSE, handle);
break;
+ case CMD_ZERO_NUM:
+ ret = iptc_zero_counter(chain, rulenum, handle);
+ break;
case CMD_LIST:
case CMD_LIST|CMD_ZERO:
+ case CMD_LIST|CMD_ZERO_NUM:
ret = list_entries(chain,
rulenum,
options&OPT_VERBOSE,
@@ -2099,9 +2111,12 @@ int do_command(int argc, char *argv[], char **table, iptc_handle_t *handle)
if (ret && (command & CMD_ZERO))
ret = zero_entries(chain,
options&OPT_VERBOSE, handle);
+ if (ret && (command & CMD_ZERO_NUM))
+ ret = iptc_zero_counter(chain, rulenum, handle);
break;
case CMD_LIST_RULES:
case CMD_LIST_RULES|CMD_ZERO:
+ case CMD_LIST_RULES|CMD_ZERO_NUM:
ret = list_rules(chain,
rulenum,
options&OPT_VERBOSE,
@@ -2109,6 +2124,8 @@ int do_command(int argc, char *argv[], char **table, iptc_handle_t *handle)
if (ret && (command & CMD_ZERO))
ret = zero_entries(chain,
options&OPT_VERBOSE, handle);
+ if (ret && (command & CMD_ZERO_NUM))
+ ret = iptc_zero_counter(chain, rulenum, handle);
break;
case CMD_NEW_CHAIN:
ret = iptc_create_chain(chain, handle);
build-vm-jenner:/jenner/pkgs/iptables#
Mohit Mehta
Vyatta Inc.
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