diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/Makefile.am | 1 | ||||
| -rw-r--r-- | src/expr/byteorder.c | 348 | ||||
| -rw-r--r-- | src/expr_ops.c | 2 |
3 files changed, 351 insertions, 0 deletions
diff --git a/src/Makefile.am b/src/Makefile.am index 7fbb0f4..5872cce 100644 --- a/src/Makefile.am +++ b/src/Makefile.am @@ -12,6 +12,7 @@ libnftables_la_SOURCES = table.c \ expr.c \ expr_ops.c \ expr/bitwise.c \ + expr/byteorder.c \ expr/cmp.c \ expr/counter.c \ expr/ct.c \ diff --git a/src/expr/byteorder.c b/src/expr/byteorder.c new file mode 100644 index 0000000..9d75824 --- /dev/null +++ b/src/expr/byteorder.c @@ -0,0 +1,348 @@ +/* + * (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 <stdio.h> +#include <stdint.h> +#include <string.h> /* for memcpy */ +#include <arpa/inet.h> +#include <errno.h> +#include <libmnl/libmnl.h> +#include <linux/netfilter/nf_tables.h> +#include <libnftables/expr.h> +#include <libnftables/rule.h> +#include "data_reg.h" +#include "expr_ops.h" + +struct nft_expr_byteorder { + enum nft_registers sreg; + enum nft_registers dreg; + enum nft_byteorder_ops op; + unsigned int len; + unsigned int size; +}; + +static int +nft_rule_expr_byteorder_set(struct nft_rule_expr *e, uint16_t type, + const void *data, size_t data_len) +{ + struct nft_expr_byteorder *byteorder = + (struct nft_expr_byteorder *)e->data; + + switch(type) { + case NFT_EXPR_BYTEORDER_SREG: + byteorder->sreg = *((uint32_t *)data); + break; + case NFT_EXPR_BYTEORDER_DREG: + byteorder->dreg = *((uint32_t *)data); + break; + case NFT_EXPR_BYTEORDER_OP: + byteorder->op = *((uint32_t *)data); + break; + case NFT_EXPR_BYTEORDER_LEN: + byteorder->len = *((unsigned int *)data); + break; + case NFT_EXPR_BYTEORDER_SIZE: + byteorder->size = *((unsigned int *)data); + break; + default: + return -1; + } + return 0; +} + +static const void * +nft_rule_expr_byteorder_get(struct nft_rule_expr *e, uint16_t type, + size_t *data_len) +{ + struct nft_expr_byteorder *byteorder = + (struct nft_expr_byteorder *)e->data; + + switch(type) { + case NFT_EXPR_BYTEORDER_SREG: + if (e->flags & (1 << NFT_EXPR_BYTEORDER_SREG)) { + *data_len = sizeof(byteorder->sreg); + return &byteorder->sreg; + } + break; + case NFT_EXPR_BYTEORDER_DREG: + if (e->flags & (1 << NFT_EXPR_BYTEORDER_DREG)) { + *data_len = sizeof(byteorder->dreg); + return &byteorder->dreg; + } + break; + case NFT_EXPR_BYTEORDER_OP: + if (e->flags & (1 << NFT_EXPR_BYTEORDER_OP)) { + *data_len = sizeof(byteorder->op); + return &byteorder->op; + } + break; + case NFT_EXPR_BYTEORDER_LEN: + if (e->flags & (1 << NFT_EXPR_BYTEORDER_LEN)) { + *data_len = sizeof(byteorder->len); + return &byteorder->len; + } + break; + case NFT_EXPR_BYTEORDER_SIZE: + if (e->flags & (1 << NFT_EXPR_BYTEORDER_SIZE)) { + *data_len = sizeof(byteorder->size); + return &byteorder->size; + } + break; + default: + break; + } + return NULL; +} + +static int nft_rule_expr_byteorder_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_BYTEORDER_MAX) < 0) + return MNL_CB_OK; + + switch(type) { + case NFTA_BYTEORDER_SREG: + case NFTA_BYTEORDER_DREG: + case NFTA_BYTEORDER_OP: + case NFTA_BYTEORDER_LEN: + case NFTA_BYTEORDER_SIZE: + if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) { + perror("mnl_attr_validate"); + return MNL_CB_ERROR; + } + break; + } + + tb[type] = attr; + return MNL_CB_OK; +} + +static void +nft_rule_expr_byteorder_build(struct nlmsghdr *nlh, struct nft_rule_expr *e) +{ + struct nft_expr_byteorder *byteorder = + (struct nft_expr_byteorder *)e->data; + + if (e->flags & (1 << NFT_EXPR_BYTEORDER_SREG)) { + mnl_attr_put_u32(nlh, NFTA_BYTEORDER_SREG, + htonl(byteorder->sreg)); + } + if (e->flags & (1 << NFT_EXPR_BYTEORDER_DREG)) { + mnl_attr_put_u32(nlh, NFTA_BYTEORDER_DREG, + htonl(byteorder->dreg)); + } + if (e->flags & (1 << NFT_EXPR_BYTEORDER_OP)) { + mnl_attr_put_u32(nlh, NFTA_BYTEORDER_OP, + htonl(byteorder->op)); + } + if (e->flags & (1 << NFT_EXPR_BYTEORDER_LEN)) { + mnl_attr_put_u32(nlh, NFTA_BYTEORDER_LEN, + htonl(byteorder->len)); + } + if (e->flags & (1 << NFT_EXPR_BYTEORDER_SIZE)) { + mnl_attr_put_u32(nlh, NFTA_BYTEORDER_SIZE, + htonl(byteorder->size)); + } +} + +static int +nft_rule_expr_byteorder_parse(struct nft_rule_expr *e, struct nlattr *attr) +{ + struct nft_expr_byteorder *byteorder = (struct nft_expr_byteorder *)e->data; + struct nlattr *tb[NFTA_BYTEORDER_MAX+1] = {}; + int ret = 0; + + if (mnl_attr_parse_nested(attr, nft_rule_expr_byteorder_cb, tb) < 0) + return -1; + + if (tb[NFTA_BYTEORDER_SREG]) { + byteorder->sreg = + ntohl(mnl_attr_get_u32(tb[NFTA_BYTEORDER_SREG])); + e->flags |= (1 << NFT_EXPR_BYTEORDER_SREG); + } + if (tb[NFTA_BYTEORDER_DREG]) { + byteorder->dreg = + ntohl(mnl_attr_get_u32(tb[NFTA_BYTEORDER_DREG])); + e->flags |= (1 << NFT_EXPR_BYTEORDER_DREG); + } + if (tb[NFTA_BYTEORDER_OP]) { + byteorder->op = + ntohl(mnl_attr_get_u32(tb[NFTA_BYTEORDER_OP])); + e->flags |= (1 << NFT_EXPR_BYTEORDER_OP); + } + if (tb[NFTA_BYTEORDER_LEN]) { + byteorder->len = + ntohl(mnl_attr_get_u32(tb[NFTA_BYTEORDER_LEN])); + e->flags |= (1 << NFT_EXPR_BYTEORDER_LEN); + } + if (tb[NFTA_BYTEORDER_SIZE]) { + byteorder->size = + ntohl(mnl_attr_get_u32(tb[NFTA_BYTEORDER_SIZE])); + e->flags |= (1 << NFT_EXPR_BYTEORDER_SIZE); + } + + return ret; +} + +static int +nft_rule_expr_byteorder_xml_parse(struct nft_rule_expr *e, char *xml) +{ +#ifdef XML_PARSING + struct nft_expr_byteorder *byteorder = (struct nft_expr_byteorder *)e; + mxml_node_t *tree = NULL; + mxml_node_t *node = NULL; + uint64_t tmp; + char *endptr = NULL; + + tree = mxmlLoadString(NULL, xml, MXML_OPAQUE_CALLBACK); + if (tree == NULL) + return -1; + + if (mxmlElementGetAttr(tree, "type") == NULL) + goto err; + + if (strcmp("byteorder", mxmlElementGetAttr(tree, "type")) != 0) + goto err; + + node = mxmlFindElement(tree, tree, "sreg", NULL, NULL, + MXML_DESCEND_FIRST); + if (node == NULL) + goto err; + + tmp = strtoull(node->child->value.opaque, &endptr, 10); + if (tmp > UINT32_MAX || tmp < 0 || *endptr) + goto err; + + byteorder->sreg = tmp; + e->flags |= (1 << NFT_EXPR_BYTEORDER_SREG); + + node = mxmlFindElement(tree, tree, "dreg", NULL, NULL, MXML_DESCEND); + if (node == NULL) + goto err; + + tmp = strtoull(node->child->value.opaque, &endptr, 10); + if (tmp > UINT32_MAX || tmp < 0 || *endptr) + goto err; + + byteorder->dreg = tmp; + e->flags |= (1 << NFT_EXPR_BYTEORDER_DREG); + + node = mxmlFindElement(tree, tree, "op", 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; + + byteorder->op = tmp; + e->flags |= (1 << NFT_EXPR_BYTEORDER_OP); + + node = mxmlFindElement(tree, tree, "len", 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; + + byteorder->len = tmp; + e->flags |= (1 << NFT_EXPR_BYTEORDER_LEN); + + node = mxmlFindElement(tree, tree, "size", 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; + + byteorder->size = tmp; + e->flags |= (1 << NFT_EXPR_BYTEORDER_SIZE); + + mxmlDelete(tree); + return 0; +err: + mxmlDelete(tree); + errno = EINVAL; + return -1; +#else + errno = EOPNOTSUPP; + return -1; +#endif +} + +static int +nft_rule_expr_byteorder_snprintf_xml(char *buf, size_t size, + struct nft_expr_byteorder *byteorder) +{ + int len = size, offset = 0, ret; + + ret = snprintf(buf, len, "<sreg>%u</sreg>" + "<dreg>%u</dreg>" + "<op>%u</op>" + "<len>%u</len>" + "<size>%u</size>", + byteorder->sreg, byteorder->dreg, byteorder->op, + byteorder->len, byteorder->size); + SNPRINTF_BUFFER_SIZE(ret, size, len, offset); + + return offset; +} + +static int +nft_rule_expr_byteorder_snprintf_default(char *buf, size_t size, + struct nft_expr_byteorder *byteorder) +{ + int len = size, offset = 0, ret; + + ret = snprintf(buf, len, "sreg=%u dreg=%u op=%u len=%u size=%u ", + byteorder->sreg, byteorder->dreg, byteorder->op, + byteorder->len, byteorder->size); + SNPRINTF_BUFFER_SIZE(ret, size, len, offset); + + return offset; +} + +static int +nft_rule_expr_byteorder_snprintf(char *buf, size_t size, uint32_t type, + uint32_t flags, struct nft_rule_expr *e) +{ + struct nft_expr_byteorder *byteorder = (struct nft_expr_byteorder *)e->data; + + switch(type) { + case NFT_RULE_O_DEFAULT: + return nft_rule_expr_byteorder_snprintf_default(buf, size, + byteorder); + case NFT_RULE_O_XML: + return nft_rule_expr_byteorder_snprintf_xml(buf, size, + byteorder); + default: + break; + } + return -1; +} + +struct expr_ops expr_ops_byteorder = { + .name = "byteorder", + .alloc_len = sizeof(struct nft_expr_byteorder), + .max_attr = NFTA_BYTEORDER_MAX, + .set = nft_rule_expr_byteorder_set, + .get = nft_rule_expr_byteorder_get, + .parse = nft_rule_expr_byteorder_parse, + .build = nft_rule_expr_byteorder_build, + .snprintf = nft_rule_expr_byteorder_snprintf, + .xml_parse = nft_rule_expr_byteorder_xml_parse, +}; diff --git a/src/expr_ops.c b/src/expr_ops.c index 0a2547d..3d0d653 100644 --- a/src/expr_ops.c +++ b/src/expr_ops.c @@ -3,6 +3,7 @@ #include "expr_ops.h" extern struct expr_ops expr_ops_bitwise; +extern struct expr_ops expr_ops_byteorder; extern struct expr_ops expr_ops_cmp; extern struct expr_ops expr_ops_counter; extern struct expr_ops expr_ops_ct; @@ -18,6 +19,7 @@ extern struct expr_ops expr_ops_target; struct expr_ops *expr_ops[] = { &expr_ops_bitwise, + &expr_ops_byteorder, &expr_ops_cmp, &expr_ops_counter, &expr_ops_ct, |