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Diffstat (limited to '')
| -rw-r--r-- | src/expr/socket.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/src/expr/socket.c b/src/expr/socket.c new file mode 100644 index 0000000..83045c0 --- /dev/null +++ b/src/expr/socket.c @@ -0,0 +1,169 @@ +/* + * Copyright (c) 2018 Máté Eckl <ecklm94@gmail.com> + * + * 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 <string.h> +#include <arpa/inet.h> +#include <errno.h> +#include <linux/netfilter/nf_tables.h> + +#include "internal.h" +#include <libmnl/libmnl.h> +#include <libnftnl/expr.h> +#include <libnftnl/rule.h> + +struct nftnl_expr_socket { + enum nft_socket_keys key; + enum nft_registers dreg; + uint32_t level; +}; + +static int +nftnl_expr_socket_set(struct nftnl_expr *e, uint16_t type, + const void *data, uint32_t data_len) +{ + struct nftnl_expr_socket *socket = nftnl_expr_data(e); + + switch (type) { + case NFTNL_EXPR_SOCKET_KEY: + memcpy(&socket->key, data, sizeof(socket->key)); + break; + case NFTNL_EXPR_SOCKET_DREG: + memcpy(&socket->dreg, data, sizeof(socket->dreg)); + break; + case NFTNL_EXPR_SOCKET_LEVEL: + memcpy(&socket->level, data, sizeof(socket->level)); + break; + default: + return -1; + } + return 0; +} + +static const void * +nftnl_expr_socket_get(const struct nftnl_expr *e, uint16_t type, + uint32_t *data_len) +{ + struct nftnl_expr_socket *socket = nftnl_expr_data(e); + + switch (type) { + case NFTNL_EXPR_SOCKET_KEY: + *data_len = sizeof(socket->key); + return &socket->key; + case NFTNL_EXPR_SOCKET_DREG: + *data_len = sizeof(socket->dreg); + return &socket->dreg; + case NFTNL_EXPR_SOCKET_LEVEL: + *data_len = sizeof(socket->level); + return &socket->level; + } + return NULL; +} + +static int nftnl_expr_socket_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_SOCKET_MAX) < 0) + return MNL_CB_OK; + + switch (type) { + case NFTA_SOCKET_KEY: + case NFTA_SOCKET_DREG: + case NFTA_SOCKET_LEVEL: + if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) + abi_breakage(); + break; + } + + tb[type] = attr; + return MNL_CB_OK; +} + +static void +nftnl_expr_socket_build(struct nlmsghdr *nlh, const struct nftnl_expr *e) +{ + struct nftnl_expr_socket *socket = nftnl_expr_data(e); + + if (e->flags & (1 << NFTNL_EXPR_SOCKET_KEY)) + mnl_attr_put_u32(nlh, NFTA_SOCKET_KEY, htonl(socket->key)); + if (e->flags & (1 << NFTNL_EXPR_SOCKET_DREG)) + mnl_attr_put_u32(nlh, NFTA_SOCKET_DREG, htonl(socket->dreg)); + if (e->flags & (1 << NFTNL_EXPR_SOCKET_LEVEL)) + mnl_attr_put_u32(nlh, NFTA_SOCKET_LEVEL, htonl(socket->level)); +} + +static int +nftnl_expr_socket_parse(struct nftnl_expr *e, struct nlattr *attr) +{ + struct nftnl_expr_socket *socket = nftnl_expr_data(e); + struct nlattr *tb[NFTA_SOCKET_MAX+1] = {}; + + if (mnl_attr_parse_nested(attr, nftnl_expr_socket_cb, tb) < 0) + return -1; + + if (tb[NFTA_SOCKET_KEY]) { + socket->key = ntohl(mnl_attr_get_u32(tb[NFTA_SOCKET_KEY])); + e->flags |= (1 << NFTNL_EXPR_SOCKET_KEY); + } + if (tb[NFTA_SOCKET_DREG]) { + socket->dreg = ntohl(mnl_attr_get_u32(tb[NFTA_SOCKET_DREG])); + e->flags |= (1 << NFTNL_EXPR_SOCKET_DREG); + } + if (tb[NFTA_SOCKET_LEVEL]) { + socket->level = ntohl(mnl_attr_get_u32(tb[NFTA_SOCKET_LEVEL])); + e->flags |= (1 << NFTNL_EXPR_SOCKET_LEVEL); + } + + return 0; +} + +static const char *socket_key2str_array[NFT_SOCKET_MAX + 1] = { + [NFT_SOCKET_TRANSPARENT] = "transparent", + [NFT_SOCKET_MARK] = "mark", + [NFT_SOCKET_WILDCARD] = "wildcard", + [NFT_SOCKET_CGROUPV2] = "cgroupv2", +}; + +static const char *socket_key2str(uint8_t key) +{ + if (key < NFT_SOCKET_MAX + 1) + return socket_key2str_array[key]; + + return "unknown"; +} + +static int +nftnl_expr_socket_snprintf(char *buf, size_t len, + uint32_t flags, const struct nftnl_expr *e) +{ + struct nftnl_expr_socket *socket = nftnl_expr_data(e); + + if (e->flags & (1 << NFTNL_EXPR_SOCKET_DREG)) { + return snprintf(buf, len, "load %s => reg %u ", + socket_key2str(socket->key), socket->dreg); + } + if (e->flags & (1 << NFTNL_EXPR_SOCKET_LEVEL)) + return snprintf(buf, len, "level %u ", socket->level); + + return 0; +} + +struct expr_ops expr_ops_socket = { + .name = "socket", + .alloc_len = sizeof(struct nftnl_expr_socket), + .max_attr = NFTA_SOCKET_MAX, + .set = nftnl_expr_socket_set, + .get = nftnl_expr_socket_get, + .parse = nftnl_expr_socket_parse, + .build = nftnl_expr_socket_build, + .output = nftnl_expr_socket_snprintf, +}; |