diff options
Diffstat (limited to 'src/obj/ct_helper.c')
| -rw-r--r-- | src/obj/ct_helper.c | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/src/obj/ct_helper.c b/src/obj/ct_helper.c new file mode 100644 index 0000000..a31bd6f --- /dev/null +++ b/src/obj/ct_helper.c @@ -0,0 +1,154 @@ +/* + * (C) 2017 Red Hat GmbH + * Author: Florian Westphal <fw@strlen.de> + * + * 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 <stdint.h> +#include <arpa/inet.h> +#include <errno.h> +#include <inttypes.h> + +#include <linux/netfilter/nf_tables.h> + +#include "internal.h" +#include <libmnl/libmnl.h> +#include <libnftnl/object.h> + +#include "obj.h" + +static int nftnl_obj_ct_helper_set(struct nftnl_obj *e, uint16_t type, + const void *data, uint32_t data_len) +{ + struct nftnl_obj_ct_helper *helper = nftnl_obj_data(e); + + switch (type) { + case NFTNL_OBJ_CT_HELPER_NAME: + snprintf(helper->name, sizeof(helper->name), "%s", (const char *)data); + break; + case NFTNL_OBJ_CT_HELPER_L3PROTO: + memcpy(&helper->l3proto, data, sizeof(helper->l3proto)); + break; + case NFTNL_OBJ_CT_HELPER_L4PROTO: + memcpy(&helper->l4proto, data, sizeof(helper->l4proto)); + break; + default: + return -1; + } + return 0; +} + +static const void *nftnl_obj_ct_helper_get(const struct nftnl_obj *e, + uint16_t type, uint32_t *data_len) +{ + struct nftnl_obj_ct_helper *helper = nftnl_obj_data(e); + + switch (type) { + case NFTNL_OBJ_CT_HELPER_NAME: + *data_len = strlen(helper->name); + return helper->name; + case NFTNL_OBJ_CT_HELPER_L3PROTO: + *data_len = sizeof(helper->l3proto); + return &helper->l3proto; + case NFTNL_OBJ_CT_HELPER_L4PROTO: + *data_len = sizeof(helper->l4proto); + return &helper->l4proto; + } + return NULL; +} + +static int nftnl_obj_ct_helper_cb(const struct nlattr *attr, void *data) +{ + const struct nftnl_obj_ct_helper *helper = NULL; + int type = mnl_attr_get_type(attr); + const struct nlattr **tb = data; + + if (mnl_attr_type_valid(attr, NFTA_CT_HELPER_MAX) < 0) + return MNL_CB_OK; + + switch (type) { + case NFTA_CT_HELPER_NAME: + if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0) + abi_breakage(); + if (mnl_attr_get_payload_len(attr) >= sizeof(helper->name)) + abi_breakage(); + break; + case NFTA_CT_HELPER_L3PROTO: + if (mnl_attr_validate(attr, MNL_TYPE_U16) < 0) + abi_breakage(); + break; + case NFTA_CT_HELPER_L4PROTO: + if (mnl_attr_validate(attr, MNL_TYPE_U8) < 0) + abi_breakage(); + break; + } + + tb[type] = attr; + return MNL_CB_OK; +} + +static void +nftnl_obj_ct_helper_build(struct nlmsghdr *nlh, const struct nftnl_obj *e) +{ + struct nftnl_obj_ct_helper *helper = nftnl_obj_data(e); + + if (e->flags & (1 << NFTNL_OBJ_CT_HELPER_NAME)) + mnl_attr_put_str(nlh, NFTA_CT_HELPER_NAME, helper->name); + if (e->flags & (1 << NFTNL_OBJ_CT_HELPER_L3PROTO)) + mnl_attr_put_u16(nlh, NFTA_CT_HELPER_L3PROTO, htons(helper->l3proto)); + if (e->flags & (1 << NFTNL_OBJ_CT_HELPER_L4PROTO)) + mnl_attr_put_u8(nlh, NFTA_CT_HELPER_L4PROTO, helper->l4proto); +} + +static int +nftnl_obj_ct_helper_parse(struct nftnl_obj *e, struct nlattr *attr) +{ + struct nftnl_obj_ct_helper *helper = nftnl_obj_data(e); + struct nlattr *tb[NFTA_CT_HELPER_MAX + 1] = {}; + + if (mnl_attr_parse_nested(attr, nftnl_obj_ct_helper_cb, tb) < 0) + return -1; + + if (tb[NFTA_CT_HELPER_NAME]) { + snprintf(helper->name, sizeof(helper->name), "%s", + mnl_attr_get_str(tb[NFTA_CT_HELPER_NAME])); + e->flags |= (1 << NFTNL_OBJ_CT_HELPER_NAME); + } + if (tb[NFTA_CT_HELPER_L3PROTO]) { + helper->l3proto = ntohs(mnl_attr_get_u16(tb[NFTA_CT_HELPER_L3PROTO])); + e->flags |= (1 << NFTNL_OBJ_CT_HELPER_L3PROTO); + } + if (tb[NFTA_CT_HELPER_L4PROTO]) { + helper->l4proto = mnl_attr_get_u8(tb[NFTA_CT_HELPER_L4PROTO]); + e->flags |= (1 << NFTNL_OBJ_CT_HELPER_L4PROTO); + } + + return 0; +} + +static int nftnl_obj_ct_helper_snprintf(char *buf, size_t len, + uint32_t flags, + const struct nftnl_obj *e) +{ + struct nftnl_obj_ct_helper *helper = nftnl_obj_data(e); + + return snprintf(buf, len, "name %s family %d protocol %d ", + helper->name, helper->l3proto, helper->l4proto); +} + +struct obj_ops obj_ops_ct_helper = { + .name = "ct_helper", + .type = NFT_OBJECT_CT_HELPER, + .alloc_len = sizeof(struct nftnl_obj_ct_helper), + .max_attr = NFTA_CT_HELPER_MAX, + .set = nftnl_obj_ct_helper_set, + .get = nftnl_obj_ct_helper_get, + .parse = nftnl_obj_ct_helper_parse, + .build = nftnl_obj_ct_helper_build, + .output = nftnl_obj_ct_helper_snprintf, +}; |