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authorMichal Kubecek <mkubecek@suse.cz>2019-04-26 11:13:06 +0200
committerDavid S. Miller <davem@davemloft.net>2019-04-27 17:03:44 -0400
commitae0be8de9a53cda3505865c11826d8ff0640237c (patch)
tree43bc8a0d58965d57e4ed1bedf8d892c3fe72e8b5 /net/netlabel
parentc7881b4a97e21b617b8243094dfa4b62028b956c (diff)
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netlink: make nla_nest_start() add NLA_F_NESTED flag
Even if the NLA_F_NESTED flag was introduced more than 11 years ago, most netlink based interfaces (including recently added ones) are still not setting it in kernel generated messages. Without the flag, message parsers not aware of attribute semantics (e.g. wireshark dissector or libmnl's mnl_nlmsg_fprintf()) cannot recognize nested attributes and won't display the structure of their contents. Unfortunately we cannot just add the flag everywhere as there may be userspace applications which check nlattr::nla_type directly rather than through a helper masking out the flags. Therefore the patch renames nla_nest_start() to nla_nest_start_noflag() and introduces nla_nest_start() as a wrapper adding NLA_F_NESTED. The calls which add NLA_F_NESTED manually are rewritten to use nla_nest_start(). Except for changes in include/net/netlink.h, the patch was generated using this semantic patch: @@ expression E1, E2; @@ -nla_nest_start(E1, E2) +nla_nest_start_noflag(E1, E2) @@ expression E1, E2; @@ -nla_nest_start_noflag(E1, E2 | NLA_F_NESTED) +nla_nest_start(E1, E2) Signed-off-by: Michal Kubecek <mkubecek@suse.cz> Acked-by: Jiri Pirko <jiri@mellanox.com> Acked-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/netlabel')
-rw-r--r--net/netlabel/netlabel_cipso_v4.c14
-rw-r--r--net/netlabel/netlabel_mgmt.c8
2 files changed, 14 insertions, 8 deletions
diff --git a/net/netlabel/netlabel_cipso_v4.c b/net/netlabel/netlabel_cipso_v4.c
index ba7800f94ccc..c9775658fb98 100644
--- a/net/netlabel/netlabel_cipso_v4.c
+++ b/net/netlabel/netlabel_cipso_v4.c
@@ -498,7 +498,7 @@ list_start:
if (ret_val != 0)
goto list_failure_lock;
- nla_a = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_TAGLST);
+ nla_a = nla_nest_start_noflag(ans_skb, NLBL_CIPSOV4_A_TAGLST);
if (nla_a == NULL) {
ret_val = -ENOMEM;
goto list_failure_lock;
@@ -517,7 +517,8 @@ list_start:
switch (doi_def->type) {
case CIPSO_V4_MAP_TRANS:
- nla_a = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSLVLLST);
+ nla_a = nla_nest_start_noflag(ans_skb,
+ NLBL_CIPSOV4_A_MLSLVLLST);
if (nla_a == NULL) {
ret_val = -ENOMEM;
goto list_failure_lock;
@@ -529,7 +530,8 @@ list_start:
CIPSO_V4_INV_LVL)
continue;
- nla_b = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSLVL);
+ nla_b = nla_nest_start_noflag(ans_skb,
+ NLBL_CIPSOV4_A_MLSLVL);
if (nla_b == NULL) {
ret_val = -ENOMEM;
goto list_retry;
@@ -548,7 +550,8 @@ list_start:
}
nla_nest_end(ans_skb, nla_a);
- nla_a = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSCATLST);
+ nla_a = nla_nest_start_noflag(ans_skb,
+ NLBL_CIPSOV4_A_MLSCATLST);
if (nla_a == NULL) {
ret_val = -ENOMEM;
goto list_retry;
@@ -560,7 +563,8 @@ list_start:
CIPSO_V4_INV_CAT)
continue;
- nla_b = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSCAT);
+ nla_b = nla_nest_start_noflag(ans_skb,
+ NLBL_CIPSOV4_A_MLSCAT);
if (nla_b == NULL) {
ret_val = -ENOMEM;
goto list_retry;
diff --git a/net/netlabel/netlabel_mgmt.c b/net/netlabel/netlabel_mgmt.c
index a16eacfb2236..c6c8a101f2ff 100644
--- a/net/netlabel/netlabel_mgmt.c
+++ b/net/netlabel/netlabel_mgmt.c
@@ -315,7 +315,7 @@ static int netlbl_mgmt_listentry(struct sk_buff *skb,
switch (entry->def.type) {
case NETLBL_NLTYPE_ADDRSELECT:
- nla_a = nla_nest_start(skb, NLBL_MGMT_A_SELECTORLIST);
+ nla_a = nla_nest_start_noflag(skb, NLBL_MGMT_A_SELECTORLIST);
if (nla_a == NULL)
return -ENOMEM;
@@ -323,7 +323,8 @@ static int netlbl_mgmt_listentry(struct sk_buff *skb,
struct netlbl_domaddr4_map *map4;
struct in_addr addr_struct;
- nla_b = nla_nest_start(skb, NLBL_MGMT_A_ADDRSELECTOR);
+ nla_b = nla_nest_start_noflag(skb,
+ NLBL_MGMT_A_ADDRSELECTOR);
if (nla_b == NULL)
return -ENOMEM;
@@ -357,7 +358,8 @@ static int netlbl_mgmt_listentry(struct sk_buff *skb,
netlbl_af6list_foreach_rcu(iter6, &entry->def.addrsel->list6) {
struct netlbl_domaddr6_map *map6;
- nla_b = nla_nest_start(skb, NLBL_MGMT_A_ADDRSELECTOR);
+ nla_b = nla_nest_start_noflag(skb,
+ NLBL_MGMT_A_ADDRSELECTOR);
if (nla_b == NULL)
return -ENOMEM;