/* * (C) 2012-2013 by Pablo Neira Ayuso * * 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 */ #include #include #include #include #include #include #include "internal.h" #include #include #include struct nftnl_expr_ct { enum nft_ct_keys key; enum nft_registers dreg; enum nft_registers sreg; uint8_t dir; }; #define IP_CT_DIR_ORIGINAL 0 #define IP_CT_DIR_REPLY 1 static int nftnl_expr_ct_set(struct nftnl_expr *e, uint16_t type, const void *data, uint32_t data_len) { struct nftnl_expr_ct *ct = nftnl_expr_data(e); switch(type) { case NFTNL_EXPR_CT_KEY: memcpy(&ct->key, data, sizeof(ct->key)); break; case NFTNL_EXPR_CT_DIR: memcpy(&ct->dir, data, sizeof(ct->dir)); break; case NFTNL_EXPR_CT_DREG: memcpy(&ct->dreg, data, sizeof(ct->dreg)); break; case NFTNL_EXPR_CT_SREG: memcpy(&ct->sreg, data, sizeof(ct->sreg)); break; default: return -1; } return 0; } static const void * nftnl_expr_ct_get(const struct nftnl_expr *e, uint16_t type, uint32_t *data_len) { struct nftnl_expr_ct *ct = nftnl_expr_data(e); switch(type) { case NFTNL_EXPR_CT_KEY: *data_len = sizeof(ct->key); return &ct->key; case NFTNL_EXPR_CT_DIR: *data_len = sizeof(ct->dir); return &ct->dir; case NFTNL_EXPR_CT_DREG: *data_len = sizeof(ct->dreg); return &ct->dreg; case NFTNL_EXPR_CT_SREG: *data_len = sizeof(ct->sreg); return &ct->sreg; } return NULL; } static int nftnl_expr_ct_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_CT_MAX) < 0) return MNL_CB_OK; switch(type) { case NFTA_CT_KEY: case NFTA_CT_DREG: case NFTA_CT_SREG: if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) abi_breakage(); break; case NFTA_CT_DIRECTION: if (mnl_attr_validate(attr, MNL_TYPE_U8) < 0) abi_breakage(); break; } tb[type] = attr; return MNL_CB_OK; } static void nftnl_expr_ct_build(struct nlmsghdr *nlh, const struct nftnl_expr *e) { struct nftnl_expr_ct *ct = nftnl_expr_data(e); if (e->flags & (1 << NFTNL_EXPR_CT_KEY)) mnl_attr_put_u32(nlh, NFTA_CT_KEY, htonl(ct->key)); if (e->flags & (1 << NFTNL_EXPR_CT_DREG)) mnl_attr_put_u32(nlh, NFTA_CT_DREG, htonl(ct->dreg)); if (e->flags & (1 << NFTNL_EXPR_CT_DIR)) mnl_attr_put_u8(nlh, NFTA_CT_DIRECTION, ct->dir); if (e->flags & (1 << NFTNL_EXPR_CT_SREG)) mnl_attr_put_u32(nlh, NFTA_CT_SREG, htonl(ct->sreg)); } static int nftnl_expr_ct_parse(struct nftnl_expr *e, struct nlattr *attr) { struct nftnl_expr_ct *ct = nftnl_expr_data(e); struct nlattr *tb[NFTA_CT_MAX+1] = {}; if (mnl_attr_parse_nested(attr, nftnl_expr_ct_cb, tb) < 0) return -1; if (tb[NFTA_CT_KEY]) { ct->key = ntohl(mnl_attr_get_u32(tb[NFTA_CT_KEY])); e->flags |= (1 << NFTNL_EXPR_CT_KEY); } if (tb[NFTA_CT_DREG]) { ct->dreg = ntohl(mnl_attr_get_u32(tb[NFTA_CT_DREG])); e->flags |= (1 << NFTNL_EXPR_CT_DREG); } if (tb[NFTA_CT_SREG]) { ct->sreg = ntohl(mnl_attr_get_u32(tb[NFTA_CT_SREG])); e->flags |= (1 << NFTNL_EXPR_CT_SREG); } if (tb[NFTA_CT_DIRECTION]) { ct->dir = mnl_attr_get_u8(tb[NFTA_CT_DIRECTION]); e->flags |= (1 << NFTNL_EXPR_CT_DIR); } return 0; } static const char *ctkey2str_array[NFT_CT_MAX + 1] = { [NFT_CT_STATE] = "state", [NFT_CT_DIRECTION] = "direction", [NFT_CT_STATUS] = "status", [NFT_CT_MARK] = "mark", [NFT_CT_SECMARK] = "secmark", [NFT_CT_EXPIRATION] = "expiration", [NFT_CT_HELPER] = "helper", [NFT_CT_L3PROTOCOL] = "l3protocol", [NFT_CT_PROTOCOL] = "protocol", [NFT_CT_SRC] = "src", [NFT_CT_DST] = "dst", [NFT_CT_PROTO_SRC] = "proto_src", [NFT_CT_PROTO_DST] = "proto_dst", [NFT_CT_LABELS] = "label", [NFT_CT_PKTS] = "packets", [NFT_CT_BYTES] = "bytes", [NFT_CT_AVGPKT] = "avgpkt", [NFT_CT_ZONE] = "zone", [NFT_CT_EVENTMASK] = "event", [NFT_CT_SRC_IP] = "src_ip", [NFT_CT_DST_IP] = "dst_ip", [NFT_CT_SRC_IP6] = "src_ip6", [NFT_CT_DST_IP6] = "dst_ip6", }; static const char *ctkey2str(uint32_t ctkey) { if (ctkey >= NFT_CT_MAX) return "unknown"; return ctkey2str_array[ctkey]; } static inline int str2ctkey(const char *ctkey) { int i; for (i = 0; i < NFT_CT_MAX; i++) { if (strcmp(ctkey2str_array[i], ctkey) == 0) return i; } return -1; } static const char *ctdir2str(uint8_t ctdir) { switch (ctdir) { case IP_CT_DIR_ORIGINAL: return "original"; case IP_CT_DIR_REPLY: return "reply"; default: return "unknown"; } } static inline int str2ctdir(const char *str, uint8_t *ctdir) { if (strcmp(str, "original") == 0) { *ctdir = IP_CT_DIR_ORIGINAL; return 0; } if (strcmp(str, "reply") == 0) { *ctdir = IP_CT_DIR_REPLY; return 0; } return -1; } static int nftnl_expr_ct_snprintf_default(char *buf, size_t size, const struct nftnl_expr *e) { int ret, remain = size, offset = 0; struct nftnl_expr_ct *ct = nftnl_expr_data(e); if (e->flags & (1 << NFTNL_EXPR_CT_SREG)) { ret = snprintf(buf, size, "set %s with reg %u ", ctkey2str(ct->key), ct->sreg); SNPRINTF_BUFFER_SIZE(ret, remain, offset); } if (e->flags & (1 << NFTNL_EXPR_CT_DREG)) { ret = snprintf(buf, remain, "load %s => reg %u ", ctkey2str(ct->key), ct->dreg); SNPRINTF_BUFFER_SIZE(ret, remain, offset); } if (nftnl_expr_is_set(e, NFTNL_EXPR_CT_DIR)) { ret = snprintf(buf + offset, remain, ", dir %s ", ctdir2str(ct->dir)); SNPRINTF_BUFFER_SIZE(ret, remain, offset); } return offset; } static int nftnl_expr_ct_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_ct_snprintf_default(buf, len, e); case NFTNL_OUTPUT_XML: case NFTNL_OUTPUT_JSON: default: break; } return -1; } struct expr_ops expr_ops_ct = { .name = "ct", .alloc_len = sizeof(struct nftnl_expr_ct), .max_attr = NFTA_CT_MAX, .set = nftnl_expr_ct_set, .get = nftnl_expr_ct_get, .parse = nftnl_expr_ct_parse, .build = nftnl_expr_ct_build, .snprintf = nftnl_expr_ct_snprintf, };