From f4621a6f870644af934869d52bf24137c76910db Mon Sep 17 00:00:00 2001 From: Florian Westphal Date: Wed, 5 Sep 2018 11:16:41 +0200 Subject: expr: add xfrm support MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Joint work with Máté Eckl. Signed-off-by: Florian Westphal Acked-by: Pablo Neira Ayuso --- src/Makefile.am | 1 + src/expr/xfrm.c | 325 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ src/expr_ops.c | 2 + 3 files changed, 328 insertions(+) create mode 100644 src/expr/xfrm.c (limited to 'src') diff --git a/src/Makefile.am b/src/Makefile.am index b5ec079..05dbeaa 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 0000000..b159d60 --- /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 +#include +#include +#include +#include +#include +#include + +#include "internal.h" +#include +#include +#include + +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 d418c3e..051140f 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, }; -- cgit v1.2.3