From 85dfe7dcd20c54e6d75d66a400f7ae038a52239b Mon Sep 17 00:00:00 2001
From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Date: Mon, 29 Dec 2014 15:31:40 +0100
Subject: [PATCH 1/2] Rename xfree() to libnftnl_xfree() to avoid symbol naming
 conflict

When ELF binaries and shared libraries are used, the internal
functions of libnftnl such as xfree() are not visible to the outside
world (their visibility is 'hidden'). Therefore, the fact that other
programs (especially nftables) may have symbols with the same name
does not cause any problem.

However, when doing static linking on a non-ELF platform (such as
Blackfin, which uses the FLAT binary format), there is no way of
encoding this visibility. Therefore, the xfree() symbols of libnftnl
becomes visible to the outside world, causing a conflict with the
xfree() symbol defined by nftables.

To solve this, this patch renames the libnftnl xfree() function to
libnftnl_xfree().

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
[Gustavo: update for version 1.0.3]

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
---
 src/chain.c          | 18 +++++++++---------
 src/common.c         |  2 +-
 src/expr.c           |  2 +-
 src/expr/data_reg.c  |  2 +-
 src/expr/immediate.c |  2 +-
 src/expr/log.c       |  6 +++---
 src/expr/match.c     |  6 +++---
 src/expr/target.c    |  6 +++---
 src/gen.c            |  2 +-
 src/internal.h       |  2 +-
 src/mxml.c           |  2 +-
 src/rule.c           | 24 ++++++++++++------------
 src/ruleset.c        |  2 +-
 src/set.c            | 18 +++++++++---------
 src/set_elem.c       | 10 +++++-----
 src/table.c          | 12 ++++++------
 src/utils.c          |  2 +-
 17 files changed, 59 insertions(+), 59 deletions(-)

diff --git a/src/chain.c b/src/chain.c
index b67385e..9ccde54 100644
--- a/src/chain.c
+++ b/src/chain.c
@@ -89,11 +89,11 @@ EXPORT_SYMBOL(nft_chain_alloc);
 void nft_chain_free(struct nft_chain *c)
 {
 	if (c->table != NULL)
-		xfree(c->table);
+		nftnl_xfree(c->table);
 	if (c->type != NULL)
-		xfree(c->type);
+		nftnl_xfree(c->type);
 
-	xfree(c);
+	nftnl_xfree(c);
 }
 EXPORT_SYMBOL(nft_chain_free);
 
@@ -111,7 +111,7 @@ void nft_chain_attr_unset(struct nft_chain *c, uint16_t attr)
 	switch (attr) {
 	case NFT_CHAIN_ATTR_TABLE:
 		if (c->table) {
-			xfree(c->table);
+			nftnl_xfree(c->table);
 			c->table = NULL;
 		}
 		break;
@@ -119,7 +119,7 @@ void nft_chain_attr_unset(struct nft_chain *c, uint16_t attr)
 		break;
 	case NFT_CHAIN_ATTR_TYPE:
 		if (c->type) {
-			xfree(c->type);
+			nftnl_xfree(c->type);
 			c->type = NULL;
 		}
 		break;
@@ -164,7 +164,7 @@ void nft_chain_attr_set_data(struct nft_chain *c, uint16_t attr,
 		break;
 	case NFT_CHAIN_ATTR_TABLE:
 		if (c->table)
-			xfree(c->table);
+			nftnl_xfree(c->table);
 
 		c->table = strdup(data);
 		break;
@@ -194,7 +194,7 @@ void nft_chain_attr_set_data(struct nft_chain *c, uint16_t attr,
 		break;
 	case NFT_CHAIN_ATTR_TYPE:
 		if (c->type)
-			xfree(c->type);
+			nftnl_xfree(c->type);
 
 		c->type = strdup(data);
 		break;
@@ -915,7 +915,7 @@ void nft_chain_list_free(struct nft_chain_list *list)
 		list_del(&r->head);
 		nft_chain_free(r);
 	}
-	xfree(list);
+	nftnl_xfree(list);
 }
 EXPORT_SYMBOL(nft_chain_list_free);
 
@@ -994,6 +994,6 @@ EXPORT_SYMBOL(nft_chain_list_iter_next);
 
 void nft_chain_list_iter_destroy(struct nft_chain_list_iter *iter)
 {
-	xfree(iter);
+	nftnl_xfree(iter);
 }
 EXPORT_SYMBOL(nft_chain_list_iter_destroy);
diff --git a/src/common.c b/src/common.c
index a6f2508..735b098 100644
--- a/src/common.c
+++ b/src/common.c
@@ -48,7 +48,7 @@ EXPORT_SYMBOL(nft_parse_err_alloc);
 
 void nft_parse_err_free(struct nft_parse_err *err)
 {
-	xfree(err);
+	nftnl_xfree(err);
 }
 EXPORT_SYMBOL(nft_parse_err_free);
 
diff --git a/src/expr.c b/src/expr.c
index 55557da..d23af01 100644
--- a/src/expr.c
+++ b/src/expr.c
@@ -52,7 +52,7 @@ void nft_rule_expr_free(struct nft_rule_expr *expr)
 	if (expr->ops->free)
 		expr->ops->free(expr);
 
-	xfree(expr);
+	nftnl_xfree(expr);
 }
 EXPORT_SYMBOL(nft_rule_expr_free);
 
diff --git a/src/expr/data_reg.c b/src/expr/data_reg.c
index 33b3346..a217d77 100644
--- a/src/expr/data_reg.c
+++ b/src/expr/data_reg.c
@@ -130,7 +130,7 @@ static int nft_data_reg_verdict_xml_parse(union nft_data_reg *reg,
 				   NFT_XML_OPT, err);
 	if (chain != NULL) {
 		if (reg->chain)
-			xfree(reg->chain);
+			nftnl_xfree(reg->chain);
 
 		reg->chain = strdup(chain);
 	}
diff --git a/src/expr/immediate.c b/src/expr/immediate.c
index 3d4e48c..d48a4e1 100644
--- a/src/expr/immediate.c
+++ b/src/expr/immediate.c
@@ -47,7 +47,7 @@ nft_rule_expr_immediate_set(struct nft_rule_expr *e, uint16_t type,
 		break;
 	case NFT_EXPR_IMM_CHAIN:
 		if (imm->data.chain)
-			xfree(imm->data.chain);
+			nftnl_xfree(imm->data.chain);
 
 		imm->data.chain = strdup(data);
 		break;
diff --git a/src/expr/log.c b/src/expr/log.c
index 0a324c4..0eec1dc 100644
--- a/src/expr/log.c
+++ b/src/expr/log.c
@@ -40,7 +40,7 @@ static int nft_rule_expr_log_set(struct nft_rule_expr *e, uint16_t type,
 	switch(type) {
 	case NFT_EXPR_LOG_PREFIX:
 		if (log->prefix)
-			xfree(log->prefix);
+			nftnl_xfree(log->prefix);
 
 		log->prefix = strdup(data);
 		break;
@@ -154,7 +154,7 @@ nft_rule_expr_log_parse(struct nft_rule_expr *e, struct nlattr *attr)
 
 	if (tb[NFTA_LOG_PREFIX]) {
 		if (log->prefix)
-			xfree(log->prefix);
+			nftnl_xfree(log->prefix);
 
 		log->prefix = strdup(mnl_attr_get_str(tb[NFTA_LOG_PREFIX]));
 		e->flags |= (1 << NFT_EXPR_LOG_PREFIX);
@@ -331,7 +331,7 @@ static void nft_rule_expr_log_free(struct nft_rule_expr *e)
 {
 	struct nft_expr_log *log = nft_expr_data(e);
 
-	xfree(log->prefix);
+	nftnl_xfree(log->prefix);
 }
 
 struct expr_ops expr_ops_log = {
diff --git a/src/expr/match.c b/src/expr/match.c
index 26a368f..b452d06 100644
--- a/src/expr/match.c
+++ b/src/expr/match.c
@@ -53,7 +53,7 @@ nft_rule_expr_match_set(struct nft_rule_expr *e, uint16_t type,
 		break;
 	case NFT_EXPR_MT_INFO:
 		if (mt->data)
-			xfree(mt->data);
+			nftnl_xfree(mt->data);
 
 		mt->data = data;
 		mt->data_len = data_len;
@@ -150,7 +150,7 @@ static int nft_rule_expr_match_parse(struct nft_rule_expr *e, struct nlattr *att
 		void *match_data;
 
 		if (match->data)
-			xfree(match->data);
+			nftnl_xfree(match->data);
 
 		match_data = calloc(1, len);
 		if (match_data == NULL)
@@ -240,7 +240,7 @@ static void nft_rule_expr_match_free(struct nft_rule_expr *e)
 {
 	struct nft_expr_match *match = nft_expr_data(e);
 
-	xfree(match->data);
+	nftnl_xfree(match->data);
 }
 
 struct expr_ops expr_ops_match = {
diff --git a/src/expr/target.c b/src/expr/target.c
index a79bc9e..bf836b7 100644
--- a/src/expr/target.c
+++ b/src/expr/target.c
@@ -53,7 +53,7 @@ nft_rule_expr_target_set(struct nft_rule_expr *e, uint16_t type,
 		break;
 	case NFT_EXPR_TG_INFO:
 		if (tg->data)
-			xfree(tg->data);
+			nftnl_xfree(tg->data);
 
 		tg->data = data;
 		tg->data_len = data_len;
@@ -150,7 +150,7 @@ static int nft_rule_expr_target_parse(struct nft_rule_expr *e, struct nlattr *at
 		void *target_data;
 
 		if (target->data)
-			xfree(target->data);
+			nftnl_xfree(target->data);
 
 		target_data = calloc(1, len);
 		if (target_data == NULL)
@@ -241,7 +241,7 @@ static void nft_rule_expr_target_free(struct nft_rule_expr *e)
 {
 	struct nft_expr_target *target = nft_expr_data(e);
 
-	xfree(target->data);
+	nftnl_xfree(target->data);
 }
 
 struct expr_ops expr_ops_target = {
diff --git a/src/gen.c b/src/gen.c
index 21d3a49..515abc4 100644
--- a/src/gen.c
+++ b/src/gen.c
@@ -37,7 +37,7 @@ EXPORT_SYMBOL(nft_gen_alloc);
 
 void nft_gen_free(struct nft_gen *gen)
 {
-	xfree(gen);
+	nftnl_xfree(gen);
 }
 EXPORT_SYMBOL(nft_gen_free);
 
diff --git a/src/internal.h b/src/internal.h
index db9af11..898a7e7 100644
--- a/src/internal.h
+++ b/src/internal.h
@@ -16,7 +16,7 @@
 #include <libnftnl/common.h>
 #include <linux/netfilter/nf_tables.h>
 
-#define xfree(ptr)	free((void *)ptr);
+#define nftnl_xfree(ptr)	free((void *)ptr);
 
 #define BASE_DEC 10
 #define BASE_HEX 16
diff --git a/src/mxml.c b/src/mxml.c
index a97d380..f4b5a05 100644
--- a/src/mxml.c
+++ b/src/mxml.c
@@ -84,7 +84,7 @@ struct nft_rule_expr *nft_mxml_expr_parse(mxml_node_t *node,
 		goto err_expr;
 
 	tree = mxmlLoadString(NULL, xml_text, MXML_OPAQUE_CALLBACK);
-	xfree(xml_text);
+	nftnl_xfree(xml_text);
 
 	if (tree == NULL)
 		goto err_expr;
diff --git a/src/rule.c b/src/rule.c
index c974f8b..56bf6ef 100644
--- a/src/rule.c
+++ b/src/rule.c
@@ -75,11 +75,11 @@ void nft_rule_free(struct nft_rule *r)
 		nft_rule_expr_free(e);
 
 	if (r->table != NULL)
-		xfree(r->table);
+		nftnl_xfree(r->table);
 	if (r->chain != NULL)
-		xfree(r->chain);
+		nftnl_xfree(r->chain);
 
-	xfree(r);
+	nftnl_xfree(r);
 }
 EXPORT_SYMBOL(nft_rule_free);
 
@@ -97,13 +97,13 @@ void nft_rule_attr_unset(struct nft_rule *r, uint16_t attr)
 	switch (attr) {
 	case NFT_RULE_ATTR_TABLE:
 		if (r->table) {
-			xfree(r->table);
+			nftnl_xfree(r->table);
 			r->table = NULL;
 		}
 		break;
 	case NFT_RULE_ATTR_CHAIN:
 		if (r->chain) {
-			xfree(r->chain);
+			nftnl_xfree(r->chain);
 			r->chain = NULL;
 		}
 		break;
@@ -139,13 +139,13 @@ void nft_rule_attr_set_data(struct nft_rule *r, uint16_t attr,
 	switch(attr) {
 	case NFT_RULE_ATTR_TABLE:
 		if (r->table)
-			xfree(r->table);
+			nftnl_xfree(r->table);
 
 		r->table = strdup(data);
 		break;
 	case NFT_RULE_ATTR_CHAIN:
 		if (r->chain)
-			xfree(r->chain);
+			nftnl_xfree(r->chain);
 
 		r->chain = strdup(data);
 		break;
@@ -395,7 +395,7 @@ static int nft_rule_parse_expr2(struct nlattr *attr, struct nft_rule *r)
 
 	if (tb[NFTA_EXPR_DATA]) {
 		if (expr->ops->parse(expr, tb[NFTA_EXPR_DATA]) < 0) {
-			xfree(expr);
+			nftnl_xfree(expr);
 			return -1;
 		}
 	}
@@ -491,7 +491,7 @@ int nft_rule_nlmsg_parse(const struct nlmsghdr *nlh, struct nft_rule *r)
 			mnl_attr_get_payload(tb[NFTA_RULE_USERDATA]);
 
 		if (r->user.data)
-			xfree(r->user.data);
+			nftnl_xfree(r->user.data);
 
 		r->user.len = mnl_attr_get_payload_len(tb[NFTA_RULE_USERDATA]);
 
@@ -1064,7 +1064,7 @@ EXPORT_SYMBOL(nft_rule_expr_iter_next);
 
 void nft_rule_expr_iter_destroy(struct nft_rule_expr_iter *iter)
 {
-	xfree(iter);
+	nftnl_xfree(iter);
 }
 EXPORT_SYMBOL(nft_rule_expr_iter_destroy);
 
@@ -1094,7 +1094,7 @@ void nft_rule_list_free(struct nft_rule_list *list)
 		list_del(&r->head);
 		nft_rule_free(r);
 	}
-	xfree(list);
+	nftnl_xfree(list);
 }
 EXPORT_SYMBOL(nft_rule_list_free);
 
@@ -1179,6 +1179,6 @@ EXPORT_SYMBOL(nft_rule_list_iter_next);
 
 void nft_rule_list_iter_destroy(struct nft_rule_list_iter *iter)
 {
-	xfree(iter);
+	nftnl_xfree(iter);
 }
 EXPORT_SYMBOL(nft_rule_list_iter_destroy);
diff --git a/src/ruleset.c b/src/ruleset.c
index 6bb7582..e482e18 100644
--- a/src/ruleset.c
+++ b/src/ruleset.c
@@ -48,7 +48,7 @@ void nft_ruleset_free(struct nft_ruleset *r)
 		nft_set_list_free(r->set_list);
 	if (r->flags & (1 << NFT_RULESET_ATTR_RULELIST))
 		nft_rule_list_free(r->rule_list);
-	xfree(r);
+	nftnl_xfree(r);
 }
 EXPORT_SYMBOL(nft_ruleset_free);
 
diff --git a/src/set.c b/src/set.c
index 2385031..0355f99 100644
--- a/src/set.c
+++ b/src/set.c
@@ -47,15 +47,15 @@ void nft_set_free(struct nft_set *s)
 	struct nft_set_elem *elem, *tmp;
 
 	if (s->table != NULL)
-		xfree(s->table);
+		nftnl_xfree(s->table);
 	if (s->name != NULL)
-		xfree(s->name);
+		nftnl_xfree(s->name);
 
 	list_for_each_entry_safe(elem, tmp, &s->element_list, head) {
 		list_del(&elem->head);
 		nft_set_elem_free(elem);
 	}
-	xfree(s);
+	nftnl_xfree(s);
 }
 EXPORT_SYMBOL(nft_set_free);
 
@@ -71,14 +71,14 @@ void nft_set_attr_unset(struct nft_set *s, uint16_t attr)
 	case NFT_SET_ATTR_TABLE:
 		if (s->flags & (1 << NFT_SET_ATTR_TABLE))
 			if (s->table) {
-				xfree(s->table);
+				nftnl_xfree(s->table);
 				s->table = NULL;
 			}
 		break;
 	case NFT_SET_ATTR_NAME:
 		if (s->flags & (1 << NFT_SET_ATTR_NAME))
 			if (s->name) {
-				xfree(s->name);
+				nftnl_xfree(s->name);
 				s->name = NULL;
 			}
 		break;
@@ -122,13 +122,13 @@ void nft_set_attr_set_data(struct nft_set *s, uint16_t attr, const void *data,
 	switch(attr) {
 	case NFT_SET_ATTR_TABLE:
 		if (s->table)
-			xfree(s->table);
+			nftnl_xfree(s->table);
 
 		s->table = strdup(data);
 		break;
 	case NFT_SET_ATTR_NAME:
 		if (s->name)
-			xfree(s->name);
+			nftnl_xfree(s->name);
 
 		s->name = strdup(data);
 		break;
@@ -963,7 +963,7 @@ void nft_set_list_free(struct nft_set_list *list)
 		list_del(&s->head);
 		nft_set_free(s);
 	}
-	xfree(list);
+	nftnl_xfree(list);
 }
 EXPORT_SYMBOL(nft_set_list_free);
 
@@ -1047,7 +1047,7 @@ EXPORT_SYMBOL(nft_set_list_iter_next);
 
 void nft_set_list_iter_destroy(struct nft_set_list_iter *iter)
 {
-	xfree(iter);
+	nftnl_xfree(iter);
 }
 EXPORT_SYMBOL(nft_set_list_iter_destroy);
 
diff --git a/src/set_elem.c b/src/set_elem.c
index 95f12bf..12d636e 100644
--- a/src/set_elem.c
+++ b/src/set_elem.c
@@ -44,11 +44,11 @@ void nft_set_elem_free(struct nft_set_elem *s)
 {
 	if (s->flags & (1 << NFT_SET_ELEM_ATTR_CHAIN)) {
 		if (s->data.chain) {
-			xfree(s->data.chain);
+			nftnl_xfree(s->data.chain);
 			s->data.chain = NULL;
 		}
 	}
-	xfree(s);
+	nftnl_xfree(s);
 }
 EXPORT_SYMBOL(nft_set_elem_free);
 
@@ -64,7 +64,7 @@ void nft_set_elem_attr_unset(struct nft_set_elem *s, uint16_t attr)
 	case NFT_SET_ELEM_ATTR_CHAIN:
 		if (s->flags & (1 << NFT_SET_ELEM_ATTR_CHAIN)) {
 			if (s->data.chain) {
-				xfree(s->data.chain);
+				nftnl_xfree(s->data.chain);
 				s->data.chain = NULL;
 			}
 		}
@@ -98,7 +98,7 @@ void nft_set_elem_attr_set(struct nft_set_elem *s, uint16_t attr,
 		break;
 	case NFT_SET_ELEM_ATTR_CHAIN:	/* NFTA_SET_ELEM_DATA */
 		if (s->data.chain)
-			xfree(s->data.chain);
+			nftnl_xfree(s->data.chain);
 
 		s->data.chain = strdup(data);
 		break;
@@ -716,7 +716,7 @@ EXPORT_SYMBOL(nft_set_elems_iter_next);
 
 void nft_set_elems_iter_destroy(struct nft_set_elems_iter *iter)
 {
-	xfree(iter);
+	nftnl_xfree(iter);
 }
 EXPORT_SYMBOL(nft_set_elems_iter_destroy);
 
diff --git a/src/table.c b/src/table.c
index c93e6fb..c89bca1 100644
--- a/src/table.c
+++ b/src/table.c
@@ -45,9 +45,9 @@ EXPORT_SYMBOL(nft_table_alloc);
 void nft_table_free(struct nft_table *t)
 {
 	if (t->flags & (1 << NFT_TABLE_ATTR_NAME))
-		xfree(t->name);
+		nftnl_xfree(t->name);
 
-	xfree(t);
+	nftnl_xfree(t);
 }
 EXPORT_SYMBOL(nft_table_free);
 
@@ -65,7 +65,7 @@ void nft_table_attr_unset(struct nft_table *t, uint16_t attr)
 	switch (attr) {
 	case NFT_TABLE_ATTR_NAME:
 		if (t->name) {
-			xfree(t->name);
+			nftnl_xfree(t->name);
 			t->name = NULL;
 		}
 		break;
@@ -95,7 +95,7 @@ void nft_table_attr_set_data(struct nft_table *t, uint16_t attr,
 	switch (attr) {
 	case NFT_TABLE_ATTR_NAME:
 		if (t->name)
-			xfree(t->name);
+			nftnl_xfree(t->name);
 
 		t->name = strdup(data);
 		break;
@@ -486,7 +486,7 @@ void nft_table_list_free(struct nft_table_list *list)
 		list_del(&r->head);
 		nft_table_free(r);
 	}
-	xfree(list);
+	nftnl_xfree(list);
 }
 EXPORT_SYMBOL(nft_table_list_free);
 
@@ -565,6 +565,6 @@ EXPORT_SYMBOL(nft_table_list_iter_next);
 
 void nft_table_list_iter_destroy(struct nft_table_list_iter *iter)
 {
-	xfree(iter);
+	nftnl_xfree(iter);
 }
 EXPORT_SYMBOL(nft_table_list_iter_destroy);
diff --git a/src/utils.c b/src/utils.c
index 9013b68..7058269 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -206,7 +206,7 @@ int nft_fprintf(FILE *fp, void *obj, uint32_t type, uint32_t flags,
 
 out:
 	if (buf != _buf)
-		xfree(buf);
+		nftnl_xfree(buf);
 
 	return ret;
 }
-- 
2.1.0