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authorPablo Neira Ayuso <pablo@netfilter.org>2007-03-14 16:45:39 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-04-25 22:25:58 -0700
commitac6d141dc7d1d0eeec850d1b451dca83ce649684 (patch)
tree300a223d61740d9d61561cd755f2adc1d050c1ff
parentc8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4 (diff)
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[NETFILTER]: nfnetlink: parse attributes with nfattr_parse in nfnetlink_check_attribute
Use nfattr_parse to parse attributes, this patch also modifies the default behaviour since unknown attributes will be ignored instead of returning EINVAL. This ensure backward compatibility: new libraries with new attributes and old kernels can work. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/netfilter/nfnetlink.c16
1 files changed, 2 insertions, 14 deletions
diff --git a/net/netfilter/nfnetlink.c b/net/netfilter/nfnetlink.c
index 9ba6aa4..dec36ab 100644
--- a/net/netfilter/nfnetlink.c
+++ b/net/netfilter/nfnetlink.c
@@ -151,26 +151,14 @@ nfnetlink_check_attributes(struct nfnetlink_subsystem *subsys,
struct nlmsghdr *nlh, struct nfattr *cda[])
{
int min_len = NLMSG_SPACE(sizeof(struct nfgenmsg));
- u_int16_t attr_count;
u_int8_t cb_id = NFNL_MSG_TYPE(nlh->nlmsg_type);
-
- attr_count = subsys->cb[cb_id].attr_count;
- memset(cda, 0, sizeof(struct nfattr *) * attr_count);
+ u_int16_t attr_count = subsys->cb[cb_id].attr_count;
/* check attribute lengths. */
if (likely(nlh->nlmsg_len > min_len)) {
struct nfattr *attr = NFM_NFA(NLMSG_DATA(nlh));
int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
-
- while (NFA_OK(attr, attrlen)) {
- unsigned flavor = NFA_TYPE(attr);
- if (flavor) {
- if (flavor > attr_count)
- return -EINVAL;
- cda[flavor - 1] = attr;
- }
- attr = NFA_NEXT(attr, attrlen);
- }
+ nfattr_parse(cda, attr_count, attr, attrlen);
}
/* implicit: if nlmsg_len == min_len, we return 0, and an empty