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Diffstat (limited to '')
| -rw-r--r-- | src/table.c | 523 |
1 files changed, 523 insertions, 0 deletions
diff --git a/src/table.c b/src/table.c new file mode 100644 index 0000000..59e7053 --- /dev/null +++ b/src/table.c @@ -0,0 +1,523 @@ +/* + * (C) 2012-2013 by Pablo Neira Ayuso <pablo@netfilter.org> + * + * 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. + * + * This code has been sponsored by Sophos Astaro <http://www.sophos.com> + */ +#include "internal.h" + +#include <time.h> +#include <endian.h> +#include <stdint.h> +#include <limits.h> +#include <stdlib.h> +#include <string.h> +#include <netinet/in.h> +#include <errno.h> + +#include <libmnl/libmnl.h> +#include <linux/netfilter/nfnetlink.h> +#include <linux/netfilter/nf_tables.h> + +#include <libnftnl/table.h> + +struct nftnl_table { + struct list_head head; + + const char *name; + uint32_t family; + uint32_t table_flags; + uint64_t handle; + uint32_t use; + uint32_t flags; + uint32_t owner; + struct { + void *data; + uint32_t len; + } user; +}; + +EXPORT_SYMBOL(nftnl_table_alloc); +struct nftnl_table *nftnl_table_alloc(void) +{ + return calloc(1, sizeof(struct nftnl_table)); +} + +EXPORT_SYMBOL(nftnl_table_free); +void nftnl_table_free(const struct nftnl_table *t) +{ + if (t->flags & (1 << NFTNL_TABLE_NAME)) + xfree(t->name); + if (t->flags & (1 << NFTNL_TABLE_USERDATA)) + xfree(t->user.data); + + xfree(t); +} + +EXPORT_SYMBOL(nftnl_table_is_set); +bool nftnl_table_is_set(const struct nftnl_table *t, uint16_t attr) +{ + return t->flags & (1 << attr); +} + +EXPORT_SYMBOL(nftnl_table_unset); +void nftnl_table_unset(struct nftnl_table *t, uint16_t attr) +{ + if (!(t->flags & (1 << attr))) + return; + + switch (attr) { + case NFTNL_TABLE_NAME: + xfree(t->name); + break; + case NFTNL_TABLE_FLAGS: + case NFTNL_TABLE_HANDLE: + case NFTNL_TABLE_FAMILY: + case NFTNL_TABLE_USE: + case NFTNL_TABLE_OWNER: + break; + } + t->flags &= ~(1 << attr); +} + +static uint32_t nftnl_table_validate[NFTNL_TABLE_MAX + 1] = { + [NFTNL_TABLE_FLAGS] = sizeof(uint32_t), + [NFTNL_TABLE_FAMILY] = sizeof(uint32_t), + [NFTNL_TABLE_HANDLE] = sizeof(uint64_t), +}; + +EXPORT_SYMBOL(nftnl_table_set_data); +int nftnl_table_set_data(struct nftnl_table *t, uint16_t attr, + const void *data, uint32_t data_len) +{ + nftnl_assert_attr_exists(attr, NFTNL_TABLE_MAX); + nftnl_assert_validate(data, nftnl_table_validate, attr, data_len); + + switch (attr) { + case NFTNL_TABLE_NAME: + if (t->flags & (1 << NFTNL_TABLE_NAME)) + xfree(t->name); + + t->name = strdup(data); + if (!t->name) + return -1; + break; + case NFTNL_TABLE_HANDLE: + memcpy(&t->handle, data, sizeof(t->handle)); + break; + case NFTNL_TABLE_FLAGS: + memcpy(&t->table_flags, data, sizeof(t->table_flags)); + break; + case NFTNL_TABLE_FAMILY: + memcpy(&t->family, data, sizeof(t->family)); + break; + case NFTNL_TABLE_USE: + memcpy(&t->use, data, sizeof(t->use)); + break; + case NFTNL_TABLE_USERDATA: + if (t->flags & (1 << NFTNL_TABLE_USERDATA)) + xfree(t->user.data); + + t->user.data = malloc(data_len); + if (!t->user.data) + return -1; + memcpy(t->user.data, data, data_len); + t->user.len = data_len; + break; + case NFTNL_TABLE_OWNER: + memcpy(&t->owner, data, sizeof(t->owner)); + break; + } + t->flags |= (1 << attr); + return 0; +} + +void nftnl_table_set(struct nftnl_table *t, uint16_t attr, const void *data) __visible; +void nftnl_table_set(struct nftnl_table *t, uint16_t attr, const void *data) +{ + nftnl_table_set_data(t, attr, data, nftnl_table_validate[attr]); +} + +EXPORT_SYMBOL(nftnl_table_set_u32); +void nftnl_table_set_u32(struct nftnl_table *t, uint16_t attr, uint32_t val) +{ + nftnl_table_set_data(t, attr, &val, sizeof(uint32_t)); +} + +EXPORT_SYMBOL(nftnl_table_set_u64); +void nftnl_table_set_u64(struct nftnl_table *t, uint16_t attr, uint64_t val) +{ + nftnl_table_set_data(t, attr, &val, sizeof(uint64_t)); +} + +EXPORT_SYMBOL(nftnl_table_set_u8); +void nftnl_table_set_u8(struct nftnl_table *t, uint16_t attr, uint8_t val) +{ + nftnl_table_set_data(t, attr, &val, sizeof(uint8_t)); +} + +EXPORT_SYMBOL(nftnl_table_set_str); +int nftnl_table_set_str(struct nftnl_table *t, uint16_t attr, const char *str) +{ + return nftnl_table_set_data(t, attr, str, strlen(str) + 1); +} + +EXPORT_SYMBOL(nftnl_table_get_data); +const void *nftnl_table_get_data(const struct nftnl_table *t, uint16_t attr, + uint32_t *data_len) +{ + if (!(t->flags & (1 << attr))) + return NULL; + + switch(attr) { + case NFTNL_TABLE_NAME: + *data_len = strlen(t->name) + 1; + return t->name; + case NFTNL_TABLE_HANDLE: + *data_len = sizeof(uint64_t); + return &t->handle; + case NFTNL_TABLE_FLAGS: + *data_len = sizeof(uint32_t); + return &t->table_flags; + case NFTNL_TABLE_FAMILY: + *data_len = sizeof(uint32_t); + return &t->family; + case NFTNL_TABLE_USE: + *data_len = sizeof(uint32_t); + return &t->use; + case NFTNL_TABLE_USERDATA: + *data_len = t->user.len; + return t->user.data; + case NFTNL_TABLE_OWNER: + *data_len = sizeof(uint32_t); + return &t->owner; + } + return NULL; +} + +EXPORT_SYMBOL(nftnl_table_get); +const void *nftnl_table_get(const struct nftnl_table *t, uint16_t attr) +{ + uint32_t data_len; + return nftnl_table_get_data(t, attr, &data_len); +} + +EXPORT_SYMBOL(nftnl_table_get_u32); +uint32_t nftnl_table_get_u32(const struct nftnl_table *t, uint16_t attr) +{ + const void *ret = nftnl_table_get(t, attr); + return ret == NULL ? 0 : *((uint32_t *)ret); +} + +EXPORT_SYMBOL(nftnl_table_get_u64); +uint64_t nftnl_table_get_u64(const struct nftnl_table *t, uint16_t attr) +{ + const void *ret = nftnl_table_get(t, attr); + return ret == NULL ? 0 : *((uint64_t *)ret); +} + +EXPORT_SYMBOL(nftnl_table_get_u8); +uint8_t nftnl_table_get_u8(const struct nftnl_table *t, uint16_t attr) +{ + const void *ret = nftnl_table_get(t, attr); + return ret == NULL ? 0 : *((uint8_t *)ret); +} + +EXPORT_SYMBOL(nftnl_table_get_str); +const char *nftnl_table_get_str(const struct nftnl_table *t, uint16_t attr) +{ + return nftnl_table_get(t, attr); +} + +EXPORT_SYMBOL(nftnl_table_nlmsg_build_payload); +void nftnl_table_nlmsg_build_payload(struct nlmsghdr *nlh, const struct nftnl_table *t) +{ + if (t->flags & (1 << NFTNL_TABLE_NAME)) + mnl_attr_put_strz(nlh, NFTA_TABLE_NAME, t->name); + if (t->flags & (1 << NFTNL_TABLE_HANDLE)) + mnl_attr_put_u64(nlh, NFTA_TABLE_HANDLE, htobe64(t->handle)); + if (t->flags & (1 << NFTNL_TABLE_FLAGS)) + mnl_attr_put_u32(nlh, NFTA_TABLE_FLAGS, htonl(t->table_flags)); + if (t->flags & (1 << NFTNL_TABLE_USERDATA)) + mnl_attr_put(nlh, NFTA_TABLE_USERDATA, t->user.len, t->user.data); +} + +static int nftnl_table_parse_attr_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_TABLE_MAX) < 0) + return MNL_CB_OK; + + switch(type) { + case NFTA_TABLE_NAME: + if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0) + abi_breakage(); + break; + case NFTA_TABLE_HANDLE: + if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0) + abi_breakage(); + break; + case NFTA_TABLE_FLAGS: + case NFTA_TABLE_USE: + case NFTA_TABLE_OWNER: + if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) + abi_breakage(); + break; + case NFTA_TABLE_USERDATA: + if (mnl_attr_validate(attr, MNL_TYPE_BINARY) < 0) + abi_breakage(); + break; + } + + tb[type] = attr; + return MNL_CB_OK; +} + +EXPORT_SYMBOL(nftnl_table_nlmsg_parse); +int nftnl_table_nlmsg_parse(const struct nlmsghdr *nlh, struct nftnl_table *t) +{ + struct nlattr *tb[NFTA_TABLE_MAX+1] = {}; + struct nfgenmsg *nfg = mnl_nlmsg_get_payload(nlh); + int ret; + + if (mnl_attr_parse(nlh, sizeof(*nfg), nftnl_table_parse_attr_cb, tb) < 0) + return -1; + + if (tb[NFTA_TABLE_NAME]) { + if (t->flags & (1 << NFTNL_TABLE_NAME)) + xfree(t->name); + t->name = strdup(mnl_attr_get_str(tb[NFTA_TABLE_NAME])); + if (!t->name) + return -1; + t->flags |= (1 << NFTNL_TABLE_NAME); + } + if (tb[NFTA_TABLE_FLAGS]) { + t->table_flags = ntohl(mnl_attr_get_u32(tb[NFTA_TABLE_FLAGS])); + t->flags |= (1 << NFTNL_TABLE_FLAGS); + } + if (tb[NFTA_TABLE_USE]) { + t->use = ntohl(mnl_attr_get_u32(tb[NFTA_TABLE_USE])); + t->flags |= (1 << NFTNL_TABLE_USE); + } + if (tb[NFTA_TABLE_HANDLE]) { + t->handle = be64toh(mnl_attr_get_u64(tb[NFTA_TABLE_HANDLE])); + t->flags |= (1 << NFTNL_TABLE_HANDLE); + } + if (tb[NFTA_TABLE_USERDATA]) { + ret = nftnl_table_set_data(t, NFTNL_TABLE_USERDATA, + mnl_attr_get_payload(tb[NFTA_TABLE_USERDATA]), + mnl_attr_get_payload_len(tb[NFTA_TABLE_USERDATA])); + if (ret < 0) + return ret; + } + if (tb[NFTA_TABLE_OWNER]) { + t->owner = ntohl(mnl_attr_get_u32(tb[NFTA_TABLE_OWNER])); + t->flags |= (1 << NFTNL_TABLE_OWNER); + } + + t->family = nfg->nfgen_family; + t->flags |= (1 << NFTNL_TABLE_FAMILY); + + return 0; +} + +static int nftnl_table_do_parse(struct nftnl_table *t, enum nftnl_parse_type type, + const void *data, struct nftnl_parse_err *err, + enum nftnl_parse_input input) +{ + int ret; + + switch (type) { + case NFTNL_PARSE_JSON: + case NFTNL_PARSE_XML: + default: + ret = -1; + errno = EOPNOTSUPP; + break; + } + + return ret; +} + +EXPORT_SYMBOL(nftnl_table_parse); +int nftnl_table_parse(struct nftnl_table *t, enum nftnl_parse_type type, + const char *data, struct nftnl_parse_err *err) +{ + return nftnl_table_do_parse(t, type, data, err, NFTNL_PARSE_BUFFER); +} + +EXPORT_SYMBOL(nftnl_table_parse_file); +int nftnl_table_parse_file(struct nftnl_table *t, enum nftnl_parse_type type, + FILE *fp, struct nftnl_parse_err *err) +{ + return nftnl_table_do_parse(t, type, fp, err, NFTNL_PARSE_FILE); +} + +static int nftnl_table_snprintf_default(char *buf, size_t size, + const struct nftnl_table *t) +{ + return snprintf(buf, size, "table %s %s flags %x use %d handle %llu", + t->name, nftnl_family2str(t->family), + t->table_flags, t->use, (unsigned long long)t->handle); +} + +static int nftnl_table_cmd_snprintf(char *buf, size_t remain, + const struct nftnl_table *t, uint32_t cmd, + uint32_t type, uint32_t flags) +{ + int ret, offset = 0; + + if (type != NFTNL_OUTPUT_DEFAULT) + return -1; + + ret = nftnl_table_snprintf_default(buf + offset, remain, t); + SNPRINTF_BUFFER_SIZE(ret, remain, offset); + return offset; +} + +EXPORT_SYMBOL(nftnl_table_snprintf); +int nftnl_table_snprintf(char *buf, size_t size, const struct nftnl_table *t, + uint32_t type, uint32_t flags) +{ + if (size) + buf[0] = '\0'; + + return nftnl_table_cmd_snprintf(buf, size, t, nftnl_flag2cmd(flags), type, + flags); +} + +static int nftnl_table_do_snprintf(char *buf, size_t size, const void *t, + uint32_t cmd, uint32_t type, uint32_t flags) +{ + return nftnl_table_snprintf(buf, size, t, type, flags); +} + +EXPORT_SYMBOL(nftnl_table_fprintf); +int nftnl_table_fprintf(FILE *fp, const struct nftnl_table *t, uint32_t type, + uint32_t flags) +{ + return nftnl_fprintf(fp, t, NFTNL_CMD_UNSPEC, type, flags, + nftnl_table_do_snprintf); +} + +struct nftnl_table_list { + struct list_head list; +}; + +EXPORT_SYMBOL(nftnl_table_list_alloc); +struct nftnl_table_list *nftnl_table_list_alloc(void) +{ + struct nftnl_table_list *list; + + list = calloc(1, sizeof(struct nftnl_table_list)); + if (list == NULL) + return NULL; + + INIT_LIST_HEAD(&list->list); + + return list; +} + +EXPORT_SYMBOL(nftnl_table_list_free); +void nftnl_table_list_free(struct nftnl_table_list *list) +{ + struct nftnl_table *r, *tmp; + + list_for_each_entry_safe(r, tmp, &list->list, head) { + list_del(&r->head); + nftnl_table_free(r); + } + xfree(list); +} + +EXPORT_SYMBOL(nftnl_table_list_is_empty); +int nftnl_table_list_is_empty(const struct nftnl_table_list *list) +{ + return list_empty(&list->list); +} + +EXPORT_SYMBOL(nftnl_table_list_add); +void nftnl_table_list_add(struct nftnl_table *r, struct nftnl_table_list *list) +{ + list_add(&r->head, &list->list); +} + +EXPORT_SYMBOL(nftnl_table_list_add_tail); +void nftnl_table_list_add_tail(struct nftnl_table *r, struct nftnl_table_list *list) +{ + list_add_tail(&r->head, &list->list); +} + +EXPORT_SYMBOL(nftnl_table_list_del); +void nftnl_table_list_del(struct nftnl_table *t) +{ + list_del(&t->head); +} + +EXPORT_SYMBOL(nftnl_table_list_foreach); +int nftnl_table_list_foreach(struct nftnl_table_list *table_list, + int (*cb)(struct nftnl_table *t, void *data), + void *data) +{ + struct nftnl_table *cur, *tmp; + int ret; + + list_for_each_entry_safe(cur, tmp, &table_list->list, head) { + ret = cb(cur, data); + if (ret < 0) + return ret; + } + return 0; +} + +struct nftnl_table_list_iter { + const struct nftnl_table_list *list; + struct nftnl_table *cur; +}; + +EXPORT_SYMBOL(nftnl_table_list_iter_create); +struct nftnl_table_list_iter * +nftnl_table_list_iter_create(const struct nftnl_table_list *l) +{ + struct nftnl_table_list_iter *iter; + + iter = calloc(1, sizeof(struct nftnl_table_list_iter)); + if (iter == NULL) + return NULL; + + iter->list = l; + if (nftnl_table_list_is_empty(l)) + iter->cur = NULL; + else + iter->cur = list_entry(l->list.next, struct nftnl_table, head); + + return iter; +} + +EXPORT_SYMBOL(nftnl_table_list_iter_next); +struct nftnl_table *nftnl_table_list_iter_next(struct nftnl_table_list_iter *iter) +{ + struct nftnl_table *r = iter->cur; + + if (r == NULL) + return NULL; + + /* get next table, if any */ + iter->cur = list_entry(iter->cur->head.next, struct nftnl_table, head); + if (&iter->cur->head == iter->list->list.next) + return NULL; + + return r; +} + +EXPORT_SYMBOL(nftnl_table_list_iter_destroy); +void nftnl_table_list_iter_destroy(const struct nftnl_table_list_iter *iter) +{ + xfree(iter); +} |