From 8a2a96237249db7816218b9cbed1457a5d51a3ad Mon Sep 17 00:00:00 2001 From: Pablo Neira Ayuso Date: Thu, 31 May 2018 17:46:13 +0200 Subject: expr: add connlimit support Signed-off-by: Pablo Neira Ayuso --- src/expr/connlimit.c | 207 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 207 insertions(+) create mode 100644 src/expr/connlimit.c (limited to 'src/expr') diff --git a/src/expr/connlimit.c b/src/expr/connlimit.c new file mode 100644 index 0000000..60965b5 --- /dev/null +++ b/src/expr/connlimit.c @@ -0,0 +1,207 @@ +/* + * (C) 2018 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. + */ + +#include +#include +#include +#include +#include + +#include + +#include "internal.h" +#include +#include +#include + +struct nftnl_expr_connlimit { + uint32_t count; + uint32_t flags; +}; + +static int +nftnl_expr_connlimit_set(struct nftnl_expr *e, uint16_t type, + const void *data, uint32_t data_len) +{ + struct nftnl_expr_connlimit *connlimit = nftnl_expr_data(e); + + switch(type) { + case NFTNL_EXPR_CONNLIMIT_COUNT: + connlimit->count = *((uint32_t *)data); + break; + case NFTNL_EXPR_CONNLIMIT_FLAGS: + connlimit->flags = *((uint32_t *)data); + break; + default: + return -1; + } + return 0; +} + +static const void * +nftnl_expr_connlimit_get(const struct nftnl_expr *e, uint16_t type, + uint32_t *data_len) +{ + struct nftnl_expr_connlimit *connlimit = nftnl_expr_data(e); + + switch(type) { + case NFTNL_EXPR_CONNLIMIT_COUNT: + *data_len = sizeof(connlimit->count); + return &connlimit->count; + case NFTNL_EXPR_CONNLIMIT_FLAGS: + *data_len = sizeof(connlimit->flags); + return &connlimit->flags; + } + return NULL; +} + +static int nftnl_expr_connlimit_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_CONNLIMIT_MAX) < 0) + return MNL_CB_OK; + + switch(type) { + case NFTA_CONNLIMIT_COUNT: + case NFTA_CONNLIMIT_FLAGS: + if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) + abi_breakage(); + break; + } + + tb[type] = attr; + return MNL_CB_OK; +} + +static void +nftnl_expr_connlimit_build(struct nlmsghdr *nlh, const struct nftnl_expr *e) +{ + struct nftnl_expr_connlimit *connlimit = nftnl_expr_data(e); + + if (e->flags & (1 << NFTNL_EXPR_CONNLIMIT_COUNT)) + mnl_attr_put_u32(nlh, NFTA_CONNLIMIT_COUNT, + htonl(connlimit->count)); + if (e->flags & (1 << NFTNL_EXPR_CONNLIMIT_FLAGS)) + mnl_attr_put_u32(nlh, NFTA_CONNLIMIT_FLAGS, + htonl(connlimit->flags)); +} + +static int +nftnl_expr_connlimit_parse(struct nftnl_expr *e, struct nlattr *attr) +{ + struct nftnl_expr_connlimit *connlimit = nftnl_expr_data(e); + struct nlattr *tb[NFTA_CONNLIMIT_MAX+1] = {}; + + if (mnl_attr_parse_nested(attr, nftnl_expr_connlimit_cb, tb) < 0) + return -1; + + if (tb[NFTA_CONNLIMIT_COUNT]) { + connlimit->count = + ntohl(mnl_attr_get_u32(tb[NFTA_CONNLIMIT_COUNT])); + e->flags |= (1 << NFTNL_EXPR_CONNLIMIT_COUNT); + } + if (tb[NFTA_CONNLIMIT_FLAGS]) { + connlimit->flags = + ntohl(mnl_attr_get_u32(tb[NFTA_CONNLIMIT_FLAGS])); + e->flags |= (1 << NFTNL_EXPR_CONNLIMIT_FLAGS); + } + + return 0; +} + +static int +nftnl_expr_connlimit_json_parse(struct nftnl_expr *e, json_t *root, + struct nftnl_parse_err *err) +{ +#ifdef JSON_PARSING + uint32_t uval32; + + if (nftnl_jansson_parse_val(root, "count", NFTNL_TYPE_U32, &uval32, + err) == 0) + nftnl_expr_set_u32(e, NFTNL_EXPR_CONNLIMIT_COUNT, uval32); + + if (nftnl_jansson_parse_val(root, "flags", NFTNL_TYPE_U32, &uval32, + err) == 0) + nftnl_expr_set_u32(e, NFTNL_EXPR_CONNLIMIT_FLAGS, uval32); + + return 0; +#else + errno = EOPNOTSUPP; + return -1; +#endif +} + +static int nftnl_expr_connlimit_export(char *buf, size_t size, + const struct nftnl_expr *e, int type) +{ + struct nftnl_expr_connlimit *connlimit = nftnl_expr_data(e); + NFTNL_BUF_INIT(b, buf, size); + + if (e->flags & (1 << NFTNL_EXPR_CONNLIMIT_COUNT)) + nftnl_buf_u32(&b, type, connlimit->count, COUNT); + if (e->flags & (1 << NFTNL_EXPR_CONNLIMIT_FLAGS)) + nftnl_buf_u32(&b, type, connlimit->flags, FLAGS); + + return nftnl_buf_done(&b); +} + +static int nftnl_expr_connlimit_snprintf_default(char *buf, size_t len, + const struct nftnl_expr *e) +{ + struct nftnl_expr_connlimit *connlimit = nftnl_expr_data(e); + + return snprintf(buf, len, "count %u flags %x ", + connlimit->count, connlimit->flags); +} + +static int nftnl_expr_connlimit_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_connlimit_snprintf_default(buf, len, e); + case NFTNL_OUTPUT_XML: + case NFTNL_OUTPUT_JSON: + return nftnl_expr_connlimit_export(buf, len, e, type); + default: + break; + } + return -1; +} + +static bool nftnl_expr_connlimit_cmp(const struct nftnl_expr *e1, + const struct nftnl_expr *e2) +{ + struct nftnl_expr_connlimit *c1 = nftnl_expr_data(e1); + struct nftnl_expr_connlimit *c2 = nftnl_expr_data(e2); + bool eq = true; + + if (e1->flags & (1 << NFTNL_EXPR_CONNLIMIT_COUNT)) + eq &= (c1->count == c2->count); + if (e1->flags & (1 << NFTNL_EXPR_CONNLIMIT_FLAGS)) + eq &= (c1->flags == c2->flags); + + return eq; +} + +struct expr_ops expr_ops_connlimit = { + .name = "connlimit", + .alloc_len = sizeof(struct nftnl_expr_connlimit), + .max_attr = NFTA_CONNLIMIT_MAX, + .cmp = nftnl_expr_connlimit_cmp, + .set = nftnl_expr_connlimit_set, + .get = nftnl_expr_connlimit_get, + .parse = nftnl_expr_connlimit_parse, + .build = nftnl_expr_connlimit_build, + .snprintf = nftnl_expr_connlimit_snprintf, + .json_parse = nftnl_expr_connlimit_json_parse, +}; -- cgit v1.2.3