From fd54772c51144696cd5b8e57b1754a9842d103c1 Mon Sep 17 00:00:00 2001 From: Pablo Neira Ayuso Date: Wed, 12 Jun 2013 12:21:10 +0200 Subject: expr: add ct This patch adds the ct expression. Signed-off-by: Pablo Neira Ayuso --- src/Makefile.am | 1 + src/expr/ct.c | 247 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ src/expr_ops.c | 2 + 3 files changed, 250 insertions(+) create mode 100644 src/expr/ct.c (limited to 'src') diff --git a/src/Makefile.am b/src/Makefile.am index f317e03..7fbb0f4 100644 --- a/src/Makefile.am +++ b/src/Makefile.am @@ -14,6 +14,7 @@ libnftables_la_SOURCES = table.c \ expr/bitwise.c \ expr/cmp.c \ expr/counter.c \ + expr/ct.c \ expr/data_reg.c \ expr/exthdr.c \ expr/log.c \ diff --git a/src/expr/ct.c b/src/expr/ct.c new file mode 100644 index 0000000..4042926 --- /dev/null +++ b/src/expr/ct.c @@ -0,0 +1,247 @@ +/* + * (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 "internal.h" +#include +#include +#include +#include "expr_ops.h" + +struct nft_expr_ct { + enum nft_ct_keys key; + uint32_t dreg; /* enum nft_registers */ + uint8_t dir; +}; + +static int +nft_rule_expr_ct_set(struct nft_rule_expr *e, uint16_t type, + const void *data, size_t data_len) +{ + struct nft_expr_ct *ct = (struct nft_expr_ct *)e->data; + + switch(type) { + case NFT_EXPR_CT_KEY: + ct->key = *((uint32_t *)data); + break; + case NFT_EXPR_CT_DIR: + ct->dreg = *((uint8_t *)data); + break; + case NFT_EXPR_CT_DREG: + ct->dreg = *((uint32_t *)data); + break; + default: + return -1; + } + return 0; +} + +static const void * +nft_rule_expr_ct_get(struct nft_rule_expr *e, uint16_t type, size_t *data_len) +{ + struct nft_expr_ct *ct = (struct nft_expr_ct *)e->data; + + switch(type) { + case NFT_EXPR_CT_KEY: + if (e->flags & (1 << NFT_EXPR_CT_KEY)) { + *data_len = sizeof(ct->key); + return &ct->key; + } else + return NULL; + break; + case NFT_EXPR_CT_DIR: + if (e->flags & (1 << NFT_EXPR_CT_DIR)) { + *data_len = sizeof(ct->dir); + return &ct->dir; + } else + return NULL; + break; + case NFT_EXPR_CT_DREG: + if (e->flags & (1 << NFT_EXPR_CT_DREG)) { + *data_len = sizeof(ct->dreg); + return &ct->dreg; + } else + return NULL; + break; + default: + break; + } + return NULL; +} + +static int nft_rule_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: + if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) { + perror("mnl_attr_validate"); + return MNL_CB_ERROR; + } + break; + case NFTA_CT_DIRECTION: + if (mnl_attr_validate(attr, MNL_TYPE_U8) < 0) { + perror("mnl_attr_validate"); + return MNL_CB_ERROR; + } + break; + } + + tb[type] = attr; + return MNL_CB_OK; +} + +static void +nft_rule_expr_ct_build(struct nlmsghdr *nlh, struct nft_rule_expr *e) +{ + struct nft_expr_ct *ct = (struct nft_expr_ct *)e->data; + + if (e->flags & (1 << NFT_EXPR_CT_KEY)) + mnl_attr_put_u32(nlh, NFTA_CT_KEY, htonl(ct->key)); + if (e->flags & (1 << NFT_EXPR_CT_DREG)) + mnl_attr_put_u32(nlh, NFTA_CT_DREG, htonl(ct->dreg)); + if (e->flags & (1 << NFT_EXPR_CT_DIR)) + mnl_attr_put_u8(nlh, NFTA_CT_DIRECTION, ct->dir); +} + +static int +nft_rule_expr_ct_parse(struct nft_rule_expr *e, struct nlattr *attr) +{ + struct nft_expr_ct *ct = (struct nft_expr_ct *)e->data; + struct nlattr *tb[NFTA_CT_MAX+1] = {}; + + if (mnl_attr_parse_nested(attr, nft_rule_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 << NFT_EXPR_CT_KEY); + } + if (tb[NFTA_CT_DREG]) { + ct->dreg = ntohl(mnl_attr_get_u32(tb[NFTA_CT_DREG])); + e->flags |= (1 << NFT_EXPR_CT_DREG); + } + if (tb[NFTA_CT_DIRECTION]) { + ct->dir = mnl_attr_get_u8(tb[NFTA_CT_DIRECTION]); + e->flags |= (1 << NFT_EXPR_CT_DIR); + } + + return 0; +} + +static int nft_rule_expr_ct_xml_parse(struct nft_rule_expr *e, char *xml) +{ +#ifdef XML_PARSING + struct nft_expr_ct *ct = (struct nft_expr_ct *)e->data; + mxml_node_t *tree = NULL; + mxml_node_t *node = NULL; + uint64_t tmp; + char *endptr; + + tree = mxmlLoadString(NULL, xml, MXML_OPAQUE_CALLBACK); + if (tree == NULL) + return -1; + + if (mxmlElementGetAttr(tree, "type") == NULL) + goto err; + + if (strcmp("ct", mxmlElementGetAttr(tree, "type")) != 0) + goto err; + + node = mxmlFindElement(tree, tree, "dreg", NULL, NULL, + MXML_DESCEND_FIRST); + if (node == NULL) + goto err; + + tmp = strtoull(node->child->value.opaque, &endptr, 10); + if (tmp > UINT8_MAX || tmp < 0 || *endptr) + goto err; + + ct->dreg = tmp; + e->flags |= (1 << NFT_EXPR_CT_DREG); + + node = mxmlFindElement(tree, tree, "key", NULL, NULL, MXML_DESCEND); + if (node == NULL) + goto err; + + tmp = strtoull(node->child->value.opaque, &endptr, 10); + if (tmp > UINT8_MAX || tmp < 0 || *endptr) + goto err; + + ct->key = tmp; + e->flags |= (1 << NFT_EXPR_CT_KEY); + + node = mxmlFindElement(tree, tree, "dir", NULL, NULL, MXML_DESCEND); + if (node == NULL) + goto err; + + tmp = strtoull(node->child->value.opaque, &endptr, 10); + if (tmp > UINT8_MAX || tmp < 0 || *endptr) + goto err; + + ct->dir = tmp; + e->flags |= (1 << NFT_EXPR_CT_DIR); + + mxmlDelete(tree); + return 0; +err: + mxmlDelete(tree); + errno = EINVAL; + return -1; +#else + errno = EOPNOTSUPP; + return -1; +#endif +} + +static int +nft_rule_expr_ct_snprintf(char *buf, size_t len, uint32_t type, + uint32_t flags, struct nft_rule_expr *e) +{ + struct nft_expr_ct *ct = (struct nft_expr_ct *)e->data; + + switch(type) { + case NFT_RULE_O_DEFAULT: + return snprintf(buf, len, "dreg=%u key=%u dir=%u ", + ct->dreg, ct->key, ct->dir); + case NFT_RULE_O_XML: + return snprintf(buf, len, "%u" + "%u" + "%u", + ct->dreg, ct->key, ct->dir); + default: + break; + } + return -1; +} + +struct expr_ops expr_ops_ct = { + .name = "ct", + .alloc_len = sizeof(struct nft_expr_ct), + .max_attr = NFTA_CT_MAX, + .set = nft_rule_expr_ct_set, + .get = nft_rule_expr_ct_get, + .parse = nft_rule_expr_ct_parse, + .build = nft_rule_expr_ct_build, + .snprintf = nft_rule_expr_ct_snprintf, + .xml_parse = nft_rule_expr_ct_xml_parse, +}; diff --git a/src/expr_ops.c b/src/expr_ops.c index 891f901..0a2547d 100644 --- a/src/expr_ops.c +++ b/src/expr_ops.c @@ -5,6 +5,7 @@ extern struct expr_ops expr_ops_bitwise; extern struct expr_ops expr_ops_cmp; extern struct expr_ops expr_ops_counter; +extern struct expr_ops expr_ops_ct; extern struct expr_ops expr_ops_exthdr; extern struct expr_ops expr_ops_immediate; extern struct expr_ops expr_ops_log; @@ -19,6 +20,7 @@ struct expr_ops *expr_ops[] = { &expr_ops_bitwise, &expr_ops_cmp, &expr_ops_counter, + &expr_ops_ct, &expr_ops_exthdr, &expr_ops_immediate, &expr_ops_match, -- cgit v1.2.3