Adding upstream version 1.2.6.upstream/1.2.6upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 257 insertions, 0 deletions

diff --git a/src/expr/log.c b/src/expr/log.c
new file mode 100644
index 0000000..180d839
--- /dev/null
+++ b/src/expr/log.c
@@ -0,0 +1,257 @@
+/*
+ * (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 <stdio.h>
+#include <stdint.h>
+#include <string.h>
+#include <arpa/inet.h>
+#include <errno.h>
+#include <linux/netfilter/nf_tables.h>
+#include <linux/netfilter/nf_log.h>
+
+#include "internal.h"
+#include <libmnl/libmnl.h>
+#include <libnftnl/expr.h>
+#include <libnftnl/rule.h>
+
+struct nftnl_expr_log {
+	uint32_t		snaplen;
+	uint16_t		group;
+	uint16_t		qthreshold;
+	uint32_t		level;
+	uint32_t		flags;
+	const char		*prefix;
+};
+
+static int nftnl_expr_log_set(struct nftnl_expr *e, uint16_t type,
+				 const void *data, uint32_t data_len)
+{
+	struct nftnl_expr_log *log = nftnl_expr_data(e);
+
+	switch(type) {
+	case NFTNL_EXPR_LOG_PREFIX:
+		if (log->flags & (1 << NFTNL_EXPR_LOG_PREFIX))
+			xfree(log->prefix);
+
+		log->prefix = strdup(data);
+		if (!log->prefix)
+			return -1;
+		break;
+	case NFTNL_EXPR_LOG_GROUP:
+		memcpy(&log->group, data, sizeof(log->group));
+		break;
+	case NFTNL_EXPR_LOG_SNAPLEN:
+		memcpy(&log->snaplen, data, sizeof(log->snaplen));
+		break;
+	case NFTNL_EXPR_LOG_QTHRESHOLD:
+		memcpy(&log->qthreshold, data, sizeof(log->qthreshold));
+		break;
+	case NFTNL_EXPR_LOG_LEVEL:
+		memcpy(&log->level, data, sizeof(log->level));
+		break;
+	case NFTNL_EXPR_LOG_FLAGS:
+		memcpy(&log->flags, data, sizeof(log->flags));
+		break;
+	default:
+		return -1;
+	}
+	return 0;
+}
+
+static const void *
+nftnl_expr_log_get(const struct nftnl_expr *e, uint16_t type,
+		      uint32_t *data_len)
+{
+	struct nftnl_expr_log *log = nftnl_expr_data(e);
+
+	switch(type) {
+	case NFTNL_EXPR_LOG_PREFIX:
+		*data_len = strlen(log->prefix)+1;
+		return log->prefix;
+	case NFTNL_EXPR_LOG_GROUP:
+		*data_len = sizeof(log->group);
+		return &log->group;
+	case NFTNL_EXPR_LOG_SNAPLEN:
+		*data_len = sizeof(log->snaplen);
+		return &log->snaplen;
+	case NFTNL_EXPR_LOG_QTHRESHOLD:
+		*data_len = sizeof(log->qthreshold);
+		return &log->qthreshold;
+	case NFTNL_EXPR_LOG_LEVEL:
+		*data_len = sizeof(log->level);
+		return &log->level;
+	case NFTNL_EXPR_LOG_FLAGS:
+		*data_len = sizeof(log->flags);
+		return &log->flags;
+	}
+	return NULL;
+}
+
+static int nftnl_expr_log_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_LOG_MAX) < 0)
+		return MNL_CB_OK;
+
+	switch(type) {
+	case NFTA_LOG_PREFIX:
+		if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0)
+			abi_breakage();
+		break;
+	case NFTA_LOG_GROUP:
+	case NFTA_LOG_QTHRESHOLD:
+		if (mnl_attr_validate(attr, MNL_TYPE_U16) < 0)
+			abi_breakage();
+		break;
+	case NFTA_LOG_SNAPLEN:
+	case NFTA_LOG_LEVEL:
+	case NFTA_LOG_FLAGS:
+		if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
+			abi_breakage();
+		break;
+	}
+
+	tb[type] = attr;
+	return MNL_CB_OK;
+}
+
+static void
+nftnl_expr_log_build(struct nlmsghdr *nlh, const struct nftnl_expr *e)
+{
+	struct nftnl_expr_log *log = nftnl_expr_data(e);
+
+	if (e->flags & (1 << NFTNL_EXPR_LOG_PREFIX))
+		mnl_attr_put_strz(nlh, NFTA_LOG_PREFIX, log->prefix);
+	if (e->flags & (1 << NFTNL_EXPR_LOG_GROUP))
+		mnl_attr_put_u16(nlh, NFTA_LOG_GROUP, htons(log->group));
+	if (e->flags & (1 << NFTNL_EXPR_LOG_SNAPLEN))
+		mnl_attr_put_u32(nlh, NFTA_LOG_SNAPLEN, htonl(log->snaplen));
+	if (e->flags & (1 << NFTNL_EXPR_LOG_QTHRESHOLD))
+		mnl_attr_put_u16(nlh, NFTA_LOG_QTHRESHOLD, htons(log->qthreshold));
+	if (e->flags & (1 << NFTNL_EXPR_LOG_LEVEL))
+		mnl_attr_put_u32(nlh, NFTA_LOG_LEVEL, htonl(log->level));
+	if (e->flags & (1 << NFTNL_EXPR_LOG_FLAGS))
+		mnl_attr_put_u32(nlh, NFTA_LOG_FLAGS, htonl(log->flags));
+}
+
+static int
+nftnl_expr_log_parse(struct nftnl_expr *e, struct nlattr *attr)
+{
+	struct nftnl_expr_log *log = nftnl_expr_data(e);
+	struct nlattr *tb[NFTA_LOG_MAX+1] = {};
+
+	if (mnl_attr_parse_nested(attr, nftnl_expr_log_cb, tb) < 0)
+		return -1;
+
+	if (tb[NFTA_LOG_PREFIX]) {
+		if (log->prefix)
+			xfree(log->prefix);
+
+		log->prefix = strdup(mnl_attr_get_str(tb[NFTA_LOG_PREFIX]));
+		if (!log->prefix)
+			return -1;
+		e->flags |= (1 << NFTNL_EXPR_LOG_PREFIX);
+	}
+	if (tb[NFTA_LOG_GROUP]) {
+		log->group = ntohs(mnl_attr_get_u16(tb[NFTA_LOG_GROUP]));
+		e->flags |= (1 << NFTNL_EXPR_LOG_GROUP);
+	}
+	if (tb[NFTA_LOG_SNAPLEN]) {
+		log->snaplen = ntohl(mnl_attr_get_u32(tb[NFTA_LOG_SNAPLEN]));
+		e->flags |= (1 << NFTNL_EXPR_LOG_SNAPLEN);
+	}
+	if (tb[NFTA_LOG_QTHRESHOLD]) {
+		log->qthreshold = ntohs(mnl_attr_get_u16(tb[NFTA_LOG_QTHRESHOLD]));
+		e->flags |= (1 << NFTNL_EXPR_LOG_QTHRESHOLD);
+	}
+	if (tb[NFTA_LOG_LEVEL]) {
+		log->level = ntohl(mnl_attr_get_u32(tb[NFTA_LOG_LEVEL]));
+		e->flags |= (1 << NFTNL_EXPR_LOG_LEVEL);
+	}
+	if (tb[NFTA_LOG_FLAGS]) {
+		log->flags = ntohl(mnl_attr_get_u32(tb[NFTA_LOG_FLAGS]));
+		e->flags |= (1 << NFTNL_EXPR_LOG_FLAGS);
+	}
+
+	return 0;
+}
+
+static int
+nftnl_expr_log_snprintf(char *buf, size_t remain,
+			uint32_t flags, const struct nftnl_expr *e)
+{
+	struct nftnl_expr_log *log = nftnl_expr_data(e);
+	int ret, offset = 0;
+
+	if (e->flags & (1 << NFTNL_EXPR_LOG_PREFIX)) {
+		ret = snprintf(buf, remain, "prefix %s ", log->prefix);
+		SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+	}
+
+	if (e->flags & (1 << NFTNL_EXPR_LOG_GROUP)) {
+		ret = snprintf(buf + offset, remain,
+			       "group %u snaplen %u qthreshold %u ",
+			       log->group, log->snaplen, log->qthreshold);
+		SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+	} else {
+		if (e->flags & (1 << NFTNL_EXPR_LOG_LEVEL)) {
+			ret = snprintf(buf + offset, remain, "level %u ",
+				       log->level);
+			SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+		}
+		if (e->flags & (1 << NFTNL_EXPR_LOG_FLAGS)) {
+			if (log->flags & NF_LOG_TCPSEQ) {
+				ret = snprintf(buf + offset, remain, "tcpseq ");
+				SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+			}
+			if (log->flags & NF_LOG_TCPOPT) {
+				ret = snprintf(buf + offset, remain, "tcpopt ");
+				SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+			}
+			if (log->flags & NF_LOG_IPOPT) {
+				ret = snprintf(buf + offset, remain, "ipopt ");
+				SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+			}
+			if (log->flags & NF_LOG_UID) {
+				ret = snprintf(buf + offset, remain, "uid ");
+				SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+			}
+			if (log->flags & NF_LOG_MACDECODE) {
+				ret = snprintf(buf + offset, remain,
+					       "macdecode ");
+				SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+			}
+		}
+	}
+
+	return offset;
+}
+
+static void nftnl_expr_log_free(const struct nftnl_expr *e)
+{
+	struct nftnl_expr_log *log = nftnl_expr_data(e);
+
+	xfree(log->prefix);
+}
+
+struct expr_ops expr_ops_log = {
+	.name		= "log",
+	.alloc_len	= sizeof(struct nftnl_expr_log),
+	.max_attr	= NFTA_LOG_MAX,
+	.free		= nftnl_expr_log_free,
+	.set		= nftnl_expr_log_set,
+	.get		= nftnl_expr_log_get,
+	.parse		= nftnl_expr_log_parse,
+	.build		= nftnl_expr_log_build,
+	.output		= nftnl_expr_log_snprintf,
+};