Signed-off-by: Florian Westphal <f...@strlen.de>
---
include/libnftnl/expr.h | 8 +
include/linux/netfilter/nf_tables.h | 29 ++++
src/Makefile.am | 1 +
src/expr/xfrm.c | 325 ++++++++++++++++++++++++++++++++++++
src/expr_ops.c | 2 +
5 files changed, 365 insertions(+)
create mode 100644 src/expr/xfrm.c
diff --git a/include/libnftnl/expr.h b/include/libnftnl/expr.h
index b0a0a851766d..6285c6fc8722 100644
--- a/include/libnftnl/expr.h
+++ b/include/libnftnl/expr.h
@@ -283,6 +283,14 @@ enum {
NFTNL_EXPR_OSF_DREG = NFTNL_EXPR_BASE,
};
+enum {
+ NFTNL_EXPR_XFRM_DREG = NFTNL_EXPR_BASE,
+ NFTNL_EXPR_XFRM_SREG,
+ NFTNL_EXPR_XFRM_KEY,
+ NFTNL_EXPR_XFRM_DIR,
+ NFTNL_EXPR_XFRM_SPNUM,
+};
+
#ifdef __cplusplus
} /* extern "C" */
#endif
diff --git a/include/linux/netfilter/nf_tables.h
b/include/linux/netfilter/nf_tables.h
index da2dda9760eb..da2c2917bd03 100644
--- a/include/linux/netfilter/nf_tables.h
+++ b/include/linux/netfilter/nf_tables.h
@@ -1495,6 +1495,35 @@ enum nft_devices_attributes {
};
#define NFTA_DEVICE_MAX (__NFTA_DEVICE_MAX - 1)
+/*
+ * enum nft_xfrm_attributes - nf_tables xfrm expr netlink attributes
+ *
+ * @NFTA_XFRM_DREG: destination register (NLA_U32)
+ * @NFTA_XFRM_KEY: enum nft_xfrm_keys (NLA_U32)
+ * @NFTA_XFRM_DIR: direction (NLA_U8)
+ * @NFTA_XFRM_SPNUM: index in secpath array (NLA_U32)
+ */
+enum nft_xfrm_attributes {
+ NFTA_XFRM_UNSPEC,
+ NFTA_XFRM_DREG,
+ NFTA_XFRM_KEY,
+ NFTA_XFRM_DIR,
+ NFTA_XFRM_SPNUM,
+ __NFTA_XFRM_MAX
+};
+#define NFTA_XFRM_MAX (__NFTA_XFRM_MAX - 1)
+
+enum nft_xfrm_keys {
+ NFT_XFRM_KEY_UNSPEC,
+ NFT_XFRM_KEY_DADDR_IP4,
+ NFT_XFRM_KEY_DADDR_IP6,
+ NFT_XFRM_KEY_SADDR_IP4,
+ NFT_XFRM_KEY_SADDR_IP6,
+ NFT_XFRM_KEY_REQID,
+ NFT_XFRM_KEY_SPI,
+ __NFT_XFRM_KEY_MAX,
+};
+#define NFT_XFRM_KEY_MAX (__NFT_XFRM_KEY_MAX - 1)
/**
* enum nft_trace_attributes - nf_tables trace netlink attributes
diff --git a/src/Makefile.am b/src/Makefile.am
index b5ec07970cd7..05dbeaa4ed92 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -59,6 +59,7 @@ libnftnl_la_SOURCES = utils.c \
expr/hash.c \
expr/socket.c \
expr/osf.c \
+ expr/xfrm.c \
obj/counter.c \
obj/ct_helper.c \
obj/quota.c \
diff --git a/src/expr/xfrm.c b/src/expr/xfrm.c
new file mode 100644
index 000000000000..b159d60d1e3f
--- /dev/null
+++ b/src/expr/xfrm.c
@@ -0,0 +1,325 @@
+/*
+ * This program is free software; you can redistribute 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.
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdint.h>
+#include <arpa/inet.h>
+#include <errno.h>
+#include <linux/netfilter/nf_tables.h>
+#include <linux/xfrm.h>
+
+#include "internal.h"
+#include <libmnl/libmnl.h>
+#include <libnftnl/expr.h>
+#include <libnftnl/rule.h>
+
+struct nftnl_expr_xfrm {
+ enum nft_registers dreg;
+ enum nft_xfrm_keys key;
+ uint32_t spnum;
+ uint8_t dir;
+};
+
+static int
+nftnl_expr_xfrm_set(struct nftnl_expr *e, uint16_t type,
+ const void *data, uint32_t data_len)
+{
+ struct nftnl_expr_xfrm *x = nftnl_expr_data(e);
+
+ switch(type) {
+ case NFTNL_EXPR_XFRM_KEY:
+ x->key = *((uint32_t *)data);
+ break;
+ case NFTNL_EXPR_XFRM_DIR:
+ x->dir = *((uint8_t *)data);
+ break;
+ case NFTNL_EXPR_XFRM_SPNUM:
+ x->spnum = *((uint32_t *)data);
+ break;
+ case NFTNL_EXPR_XFRM_DREG:
+ x->dreg = *((uint32_t *)data);
+ break;
+ default:
+ return -1;
+ }
+ return 0;
+}
+
+static const void *
+nftnl_expr_xfrm_get(const struct nftnl_expr *e, uint16_t type,
+ uint32_t *data_len)
+{
+ struct nftnl_expr_xfrm *x = nftnl_expr_data(e);
+
+ switch(type) {
+ case NFTNL_EXPR_XFRM_KEY:
+ *data_len = sizeof(x->key);
+ return &x->key;
+ case NFTNL_EXPR_XFRM_DIR:
+ *data_len = sizeof(x->dir);
+ return &x->dir;
+ case NFTNL_EXPR_XFRM_SPNUM:
+ *data_len = sizeof(x->spnum);
+ return &x->spnum;
+ case NFTNL_EXPR_XFRM_DREG:
+ *data_len = sizeof(x->dreg);
+ return &x->dreg;
+ }
+ return NULL;
+}
+
+static int nftnl_expr_xfrm_cb(const struct nlattr *attr, void *data)
+{
+ const struct nlattr **tb = data;
+ int type = mnl_attr_get_type(attr);
+
+ if (mnl_attr_type_valid(attr, NFTA_XFRM_MAX) < 0)
+ return MNL_CB_OK;
+
+ switch (type) {
+ case NFTA_XFRM_DREG:
+ case NFTA_XFRM_KEY:
+ case NFTA_XFRM_SPNUM:
+ if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
+ abi_breakage();
+ break;
+ case NFTA_XFRM_DIR:
+ if (mnl_attr_validate(attr, MNL_TYPE_U8) < 0)
+ abi_breakage();
+ break;
+ }
+
+ tb[type] = attr;
+ return MNL_CB_OK;
+}
+
+static void
+nftnl_expr_xfrm_build(struct nlmsghdr *nlh, const struct nftnl_expr *e)
+{
+ struct nftnl_expr_xfrm *x = nftnl_expr_data(e);
+
+ if (e->flags & (1 << NFTNL_EXPR_XFRM_KEY))
+ mnl_attr_put_u32(nlh, NFTA_XFRM_KEY, htonl(x->key));
+ if (e->flags & (1 << NFTNL_EXPR_XFRM_DIR))
+ mnl_attr_put_u8(nlh, NFTA_XFRM_DIR, x->dir);
+ if (e->flags & (1 << NFTNL_EXPR_XFRM_SPNUM))
+ mnl_attr_put_u32(nlh, NFTA_XFRM_SPNUM, htonl(x->spnum));
+ if (e->flags & (1 << NFTNL_EXPR_XFRM_DREG))
+ mnl_attr_put_u32(nlh, NFTA_XFRM_DREG, htonl(x->dreg));
+}
+
+static int
+nftnl_expr_xfrm_parse(struct nftnl_expr *e, struct nlattr *attr)
+{
+ struct nftnl_expr_xfrm *x = nftnl_expr_data(e);
+ struct nlattr *tb[NFTA_XFRM_MAX+1] = {};
+
+ if (mnl_attr_parse_nested(attr, nftnl_expr_xfrm_cb, tb) < 0)
+ return -1;
+
+ if (tb[NFTA_XFRM_KEY]) {
+ x->key = ntohl(mnl_attr_get_u32(tb[NFTA_XFRM_KEY]));
+ e->flags |= (1 << NFTNL_EXPR_XFRM_KEY);
+ }
+ if (tb[NFTA_XFRM_DIR]) {
+ x->dir = mnl_attr_get_u8(tb[NFTA_XFRM_DIR]);
+ e->flags |= (1 << NFTNL_EXPR_XFRM_DIR);
+ }
+ if (tb[NFTA_XFRM_SPNUM]) {
+ x->spnum = ntohl(mnl_attr_get_u32(tb[NFTA_XFRM_SPNUM]));
+ e->flags |= (1 << NFTNL_EXPR_XFRM_SPNUM);
+ }
+ if (tb[NFTA_XFRM_DREG]) {
+ x->dreg = ntohl(mnl_attr_get_u32(tb[NFTA_XFRM_DREG]));
+ e->flags |= (1 << NFTNL_EXPR_XFRM_DREG);
+ }
+ return 0;
+}
+
+static const char *xfrmkey2str_array[] = {
+ [NFT_XFRM_KEY_DADDR_IP4] = "daddr4",
+ [NFT_XFRM_KEY_SADDR_IP4] = "saddr4",
+ [NFT_XFRM_KEY_DADDR_IP6] = "daddr6",
+ [NFT_XFRM_KEY_SADDR_IP6] = "saddr6",
+ [NFT_XFRM_KEY_REQID] = "reqid",
+ [NFT_XFRM_KEY_SPI] = "spi",
+};
+
+static const char *xfrmkey2str(uint32_t key)
+{
+ if (key >= sizeof(xfrmkey2str_array) / sizeof(xfrmkey2str_array[0]))
+ return "unknown";
+
+ return xfrmkey2str_array[key];
+}
+
+static const char *xfrmdir2str_array[] = {
+ [XFRM_POLICY_IN] = "in",
+ [XFRM_POLICY_OUT] = "out",
+};
+
+static const char *xfrmdir2str(uint8_t dir)
+{
+ if (dir >= sizeof(xfrmdir2str_array) / sizeof(xfrmdir2str_array[0]))
+ return "unknown";
+
+ return xfrmdir2str_array[dir];
+}
+
+#ifdef JSON_PARSING
+static uint32_t str2xfrmkey(const char *s)
+{
+ int i;
+
+ for (i = 0;
+ i < sizeof(xfrmkey2str_array) / sizeof(xfrmkey2str_array[0]);
+ i++) {
+ if (strcmp(xfrmkey2str_array[i], s) == 0)
+ return i;
+ }
+ return -1;
+}
+
+static int str2xfmrdir(const char *s)
+{
+ int i;
+
+ for (i = 0;
+ i < sizeof(xfrmdir2str_array) / sizeof(xfrmdir2str_array[0]);
+ i++) {
+ if (strcmp(xfrmkey2str_array[i], s) == 0)
+ return i;
+ }
+ return -1;
+}
+#endif
+
+static int nftnl_expr_xfrm_json_parse(struct nftnl_expr *e, json_t *root,
+ struct nftnl_parse_err *err)
+{
+#ifdef JSON_PARSING
+ const char *key_str, *dir_str;
+ uint32_t reg, key, spnum;
+ uint8_t dir;
+
+ if (nftnl_jansson_parse_reg(root, "dreg", NFTNL_TYPE_U32, ®, err) ==
0)
+ nftnl_expr_set_u32(e, NFTNL_EXPR_XFRM_DREG, reg);
+
+ key_str = nftnl_jansson_parse_str(root, "key", err);
+ if (key_str != NULL) {
+ key = str2xfrmkey(key_str);
+ if (key < 0)
+ return -1;
+
+ nftnl_expr_set_u32(e, NFTNL_EXPR_XFRM_KEY, key);
+ }
+
+ dir_str = nftnl_jansson_parse_str(root, "dir", err);
+ if (dir_str != NULL) {
+ dir = str2xfmrdir(dir_str);
+ if (dir == -1) {
+ err->node_name = "dir";
+ err->error = NFTNL_PARSE_EBADTYPE;
+ goto err;
+ }
+ nftnl_expr_set_u8(e, NFTNL_EXPR_XFRM_DIR, dir);
+ }
+
+ return 0;
+err:
+ errno = EINVAL;
+ return -1;
+#else
+ errno = EOPNOTSUPP;
+ return -1;
+#endif
+}
+
+static int
+nftnl_expr_xfrm_export(char *buf, size_t size, const struct nftnl_expr *e,
+ int type)
+{
+ struct nftnl_expr_xfrm *x = nftnl_expr_data(e);
+ NFTNL_BUF_INIT(b, buf, size);
+
+ if (e->flags & (1 << NFTNL_EXPR_XFRM_DREG))
+ nftnl_buf_u32(&b, type, x->dreg, DREG);
+ if (e->flags & (1 << NFTNL_EXPR_XFRM_KEY))
+ nftnl_buf_str(&b, type, xfrmkey2str(x->key), KEY);
+ if (e->flags & (1 << NFTNL_EXPR_XFRM_DIR))
+ nftnl_buf_str(&b, type, xfrmdir2str(x->dir), DIR);
+ if (e->flags & (1 << NFTNL_EXPR_XFRM_SPNUM))
+ nftnl_buf_u32(&b, type, x->spnum, NUM);
+
+ return nftnl_buf_done(&b);
+}
+
+static int
+nftnl_expr_xfrm_snprintf_default(char *buf, size_t size,
+ const struct nftnl_expr *e)
+{
+ struct nftnl_expr_xfrm *x = nftnl_expr_data(e);
+ int ret, remain = size, offset = 0;
+
+ if (e->flags & (1 << NFTNL_EXPR_XFRM_DREG)) {
+ ret = snprintf(buf, remain, "load %s %u %s => reg %u ",
+ xfrmdir2str(x->dir),
+ x->spnum,
+ xfrmkey2str(x->key), x->dreg);
+ SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+ }
+ return offset;
+}
+
+static int
+nftnl_expr_xfrm_snprintf(char *buf, size_t len, uint32_t type,
+ uint32_t flags, const struct nftnl_expr *e)
+{
+ switch (type) {
+ case NFTNL_OUTPUT_DEFAULT:
+ return nftnl_expr_xfrm_snprintf_default(buf, len, e);
+ case NFTNL_OUTPUT_XML:
+ case NFTNL_OUTPUT_JSON:
+ return nftnl_expr_xfrm_export(buf, len, e, type);
+ default:
+ break;
+ }
+ return -1;
+}
+
+static bool nftnl_expr_xfrm_cmp(const struct nftnl_expr *e1,
+ const struct nftnl_expr *e2)
+{
+ struct nftnl_expr_xfrm *x1 = nftnl_expr_data(e1);
+ struct nftnl_expr_xfrm *x2 = nftnl_expr_data(e2);
+ bool eq = true;
+
+ if (e1->flags & (1 << NFTNL_EXPR_XFRM_KEY))
+ eq &= (x1->key == x2->key);
+ if (e1->flags & (1 << NFTNL_EXPR_XFRM_DIR))
+ eq &= (x1->dir == x2->dir);
+ if (e1->flags & (1 << NFTNL_EXPR_XFRM_SPNUM))
+ eq &= (x1->spnum == x2->spnum);
+ if (e1->flags & (1 << NFTNL_EXPR_XFRM_DREG))
+ eq &= (x1->dreg == x2->dreg);
+
+ return eq;
+}
+
+struct expr_ops expr_ops_xfrm = {
+ .name = "xfrm",
+ .alloc_len = sizeof(struct nftnl_expr_xfrm),
+ .max_attr = NFTA_XFRM_MAX,
+ .cmp = nftnl_expr_xfrm_cmp,
+ .set = nftnl_expr_xfrm_set,
+ .get = nftnl_expr_xfrm_get,
+ .parse = nftnl_expr_xfrm_parse,
+ .build = nftnl_expr_xfrm_build,
+ .snprintf = nftnl_expr_xfrm_snprintf,
+ .json_parse = nftnl_expr_xfrm_json_parse,
+};
diff --git a/src/expr_ops.c b/src/expr_ops.c
index d418c3e84501..051140fb1326 100644
--- a/src/expr_ops.c
+++ b/src/expr_ops.c
@@ -39,6 +39,7 @@ extern struct expr_ops expr_ops_flow;
extern struct expr_ops expr_ops_socket;
extern struct expr_ops expr_ops_tunnel;
extern struct expr_ops expr_ops_osf;
+extern struct expr_ops expr_ops_xfrm;
static struct expr_ops expr_ops_notrack = {
.name = "notrack",
@@ -81,6 +82,7 @@ static struct expr_ops *expr_ops[] = {
&expr_ops_socket,
&expr_ops_tunnel,
&expr_ops_osf,
+ &expr_ops_xfrm,
NULL,
};
--
2.16.4
