Use libmnl and libnetfilter_conntrack mnl helpers to update the conntrack
table entries.
Signed-off-by: Mikhail Sennikovsky <mikhail.sennikovskii@xxxxxxxxx>
---
src/conntrack.c | 248 ++++++++++++++++++++++++++++--------------------
1 file changed, 143 insertions(+), 105 deletions(-)
diff --git a/src/conntrack.c b/src/conntrack.c
index 0949f6a..327ca55 100644
--- a/src/conntrack.c
+++ b/src/conntrack.c
@@ -68,10 +68,13 @@
#include <linux/netfilter/nf_conntrack_common.h>
#include <libnetfilter_conntrack/libnetfilter_conntrack.h>
-static struct nfct_mnl_socket {
+struct nfct_mnl_socket {
struct mnl_socket *mnl;
uint32_t portid;
-} sock;
+};
+
+static struct nfct_mnl_socket sock;
+static struct nfct_mnl_socket modifier_sock;
struct u32_mask {
uint32_t value;
@@ -2073,33 +2076,6 @@ done:
return NFCT_CB_CONTINUE;
}
-static int print_cb(enum nf_conntrack_msg_type type,
- struct nf_conntrack *ct,
- void *data)
-{
- char buf[1024];
- unsigned int op_type = NFCT_O_DEFAULT;
- unsigned int op_flags = 0;
-
- if (output_mask & _O_SAVE) {
- ct_save_snprintf(buf, sizeof(buf), ct, labelmap, NFCT_T_NEW);
- goto done;
- }
-
- if (output_mask & _O_XML)
- op_type = NFCT_O_XML;
- if (output_mask & _O_EXT)
- op_flags = NFCT_OF_SHOW_LAYER3;
- if (output_mask & _O_ID)
- op_flags |= NFCT_OF_ID;
-
- nfct_snprintf_labels(buf, sizeof(buf), ct, NFCT_T_UNKNOWN, op_type, op_flags, labelmap);
-done:
- printf("%s\n", buf);
-
- return NFCT_CB_CONTINUE;
-}
-
static void copy_mark(const struct ct_cmd *cmd, struct nf_conntrack *tmp,
const struct nf_conntrack *ct,
const struct u32_mask *m)
@@ -2190,73 +2166,6 @@ static void copy_label(const struct ct_cmd *cmd, struct nf_conntrack *tmp,
}
}
-static int update_cb(enum nf_conntrack_msg_type type,
- struct nf_conntrack *ct,
- void *data)
-{
- struct ct_cmd *cmd = data;
- struct nf_conntrack *obj = cmd->tmpl.ct, *tmp;
- int res;
-
- if (filter_nat(cmd, ct) ||
- filter_label(ct, cur_tmpl) ||
- filter_network(cmd, ct))
- return NFCT_CB_CONTINUE;
-
- if (nfct_attr_is_set(obj, ATTR_ID) && nfct_attr_is_set(ct, ATTR_ID) &&
- nfct_get_attr_u32(obj, ATTR_ID) != nfct_get_attr_u32(ct, ATTR_ID))
- return NFCT_CB_CONTINUE;
-
- if (cmd->options & CT_OPT_TUPLE_ORIG &&
- !nfct_cmp(obj, ct, NFCT_CMP_ORIG))
- return NFCT_CB_CONTINUE;
- if (cmd->options & CT_OPT_TUPLE_REPL &&
- !nfct_cmp(obj, ct, NFCT_CMP_REPL))
- return NFCT_CB_CONTINUE;
-
- tmp = nfct_new();
- if (tmp == NULL)
- exit_error(OTHER_PROBLEM, "out of memory");
-
- nfct_copy(tmp, ct, NFCT_CP_ORIG);
- nfct_copy(tmp, obj, NFCT_CP_META);
- copy_mark(cmd, tmp, ct, &cur_tmpl->mark);
- copy_status(cmd, tmp, ct);
- copy_label(cmd, tmp, ct, cur_tmpl);
-
- /* do not send NFCT_Q_UPDATE if ct appears unchanged */
- if (nfct_cmp(tmp, ct, NFCT_CMP_ALL | NFCT_CMP_MASK)) {
- nfct_destroy(tmp);
- return NFCT_CB_CONTINUE;
- }
-
- res = nfct_query(ith, NFCT_Q_UPDATE, tmp);
- if (res < 0)
- fprintf(stderr,
- "Operation failed: %s\n",
- err2str(errno, CT_UPDATE));
- nfct_callback_register(ith, NFCT_T_ALL, print_cb, NULL);
-
- res = nfct_query(ith, NFCT_Q_GET, tmp);
- if (res < 0) {
- nfct_destroy(tmp);
- /* the entry has vanish in middle of the update */
- if (errno == ENOENT) {
- nfct_callback_unregister(ith);
- return NFCT_CB_CONTINUE;
- }
- exit_error(OTHER_PROBLEM,
- "Operation failed: %s",
- err2str(errno, CT_UPDATE));
- }
- nfct_destroy(tmp);
- nfct_callback_unregister(ith);
-
- counter++;
-
- return NFCT_CB_CONTINUE;
-}
-
static int dump_exp_cb(enum nf_conntrack_msg_type type,
struct nf_expect *exp,
void *data)
@@ -2519,6 +2428,29 @@ nfct_mnl_create(struct nfct_mnl_socket *socket,
NULL, NULL);
}
+static int
+nfct_mnl_update(struct nfct_mnl_socket *socket,
+ uint16_t subsys, uint16_t type, const struct nf_conntrack *ct)
+{
+ return nfct_mnl_call(socket, subsys, type,
+ NLM_F_REQUEST|NLM_F_ACK,
+ ct, 0,
+ NULL,
+ NULL, NULL);
+}
+
+static int
+nfct_mnl_print(struct nfct_mnl_socket *socket,
+ uint16_t subsys, uint16_t type, const struct nf_conntrack *ct,
+ mnl_cb_t cb)
+{
+ return nfct_mnl_call(socket, subsys, type,
+ NLM_F_REQUEST|NLM_F_ACK,
+ ct, 0,
+ NULL,
+ cb, NULL);
+}
+
#define UNKNOWN_STATS_NUM 4
static int nfct_stats_attr_cb(const struct nlattr *attr, void *data)
@@ -2707,6 +2639,113 @@ done:
return MNL_CB_OK;
}
+static int mnl_nfct_print_cb(const struct nlmsghdr *nlh, void *data)
+{
+ char buf[1024];
+ unsigned int op_type = NFCT_O_DEFAULT;
+ unsigned int op_flags = 0;
+ struct nf_conntrack *ct;
+
+ ct = nfct_new();
+ if (ct == NULL)
+ return MNL_CB_OK;
+
+ nfct_nlmsg_parse(nlh, ct);
+
+ if (output_mask & _O_SAVE) {
+ ct_save_snprintf(buf, sizeof(buf), ct, labelmap, NFCT_T_NEW);
+ goto done;
+ }
+
+ if (output_mask & _O_XML)
+ op_type = NFCT_O_XML;
+ if (output_mask & _O_EXT)
+ op_flags = NFCT_OF_SHOW_LAYER3;
+ if (output_mask & _O_ID)
+ op_flags |= NFCT_OF_ID;
+
+ nfct_snprintf_labels(buf, sizeof(buf), ct, NFCT_T_UNKNOWN, op_type, op_flags, labelmap);
+done:
+ printf("%s\n", buf);
+
+ return MNL_CB_OK;
+}
+
+static int mnl_nfct_update_cb(const struct nlmsghdr *nlh, void *data)
+{
+ struct ct_cmd *cmd = data;
+ struct nf_conntrack *ct, *obj = cmd->tmpl.ct, *tmp = NULL;
+ int res;
+
+ ct = nfct_new();
+ if (ct == NULL)
+ return MNL_CB_OK;
+
+ nfct_nlmsg_parse(nlh, ct);
+
+ if (filter_nat(cmd, ct) ||
+ filter_label(ct, cur_tmpl) ||
+ filter_network(cmd, ct))
+ goto destroy_ok;
+
+ if (nfct_attr_is_set(obj, ATTR_ID) && nfct_attr_is_set(ct, ATTR_ID) &&
+ nfct_get_attr_u32(obj, ATTR_ID) != nfct_get_attr_u32(ct, ATTR_ID))
+ goto destroy_ok;
+
+ if (cmd->options & CT_OPT_TUPLE_ORIG &&
+ !nfct_cmp(obj, ct, NFCT_CMP_ORIG))
+ goto destroy_ok;
+ if (cmd->options & CT_OPT_TUPLE_REPL &&
+ !nfct_cmp(obj, ct, NFCT_CMP_REPL))
+ goto destroy_ok;
+
+ tmp = nfct_new();
+ if (tmp == NULL)
+ exit_error(OTHER_PROBLEM, "out of memory");
+
+ nfct_copy(tmp, ct, NFCT_CP_ORIG);
+ nfct_copy(tmp, obj, NFCT_CP_META);
+ copy_mark(cmd, tmp, ct, &cur_tmpl->mark);
+ copy_status(cmd, tmp, ct);
+ copy_label(cmd, tmp, ct, cur_tmpl);
+
+ /* do not send NFCT_Q_UPDATE if ct appears unchanged */
+ if (nfct_cmp(tmp, ct, NFCT_CMP_ALL | NFCT_CMP_MASK))
+ goto destroy_ok;
+
+ res = nfct_mnl_update(&modifier_sock,
+ NFNL_SUBSYS_CTNETLINK,
+ IPCTNL_MSG_CT_NEW,
+ tmp);
+ if (res < 0)
+ fprintf(stderr,
+ "Operation failed: %s\n",
+ err2str(errno, CT_UPDATE));
+
+ res = nfct_mnl_print(&modifier_sock,
+ NFNL_SUBSYS_CTNETLINK,
+ IPCTNL_MSG_CT_GET,
+ tmp,
+ mnl_nfct_print_cb);
+ if (res < 0) {
+ /* the entry has vanish in middle of the update */
+ if (errno == ENOENT)
+ goto destroy_ok;
+ exit_error(OTHER_PROBLEM,
+ "Operation failed: %s",
+ err2str(errno, CT_UPDATE));
+ }
+
+ counter++;
+
+destroy_ok:
+ if (tmp)
+ nfct_destroy(tmp);
+ nfct_destroy(ct);
+
+ return MNL_CB_OK;
+}
+
static struct ctproto_handler *h;
static void labelmap_init(void)
@@ -3368,19 +3407,18 @@ static int do_command_ct(const char *progname, struct ct_cmd *cmd)
break;
case CT_UPDATE:
- cth = nfct_open(CONNTRACK, 0);
- /* internal handler for delete_cb, otherwise we hit EILSEQ */
- ith = nfct_open(CONNTRACK, 0);
- if (!cth || !ith)
+ if (nfct_mnl_socket_open(&sock, 0) < 0
+ || nfct_mnl_socket_open(&modifier_sock, 0) < 0)
exit_error(OTHER_PROBLEM, "Can't open handler");
nfct_filter_init(cmd);
- nfct_callback_register(cth, NFCT_T_ALL, update_cb, cmd);
-
- res = nfct_query(cth, NFCT_Q_DUMP, &cmd->family);
- nfct_close(ith);
- nfct_close(cth);
+ res = nfct_mnl_dump(&sock,
+ NFNL_SUBSYS_CTNETLINK,
+ IPCTNL_MSG_CT_GET,
+ mnl_nfct_update_cb, cmd, NULL);
+ nfct_mnl_socket_close(&modifier_sock);
+ nfct_mnl_socket_close(&sock);
break;
case CT_DELETE:
--
2.25.1
