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| author | Pablo Neira Ayuso <pablo@netfilter.org> | 2007-03-14 16:45:39 -0700 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-04-25 22:25:58 -0700 |
| commit | ac6d141dc7d1d0eeec850d1b451dca83ce649684 (patch) | |
| tree | 300a223d61740d9d61561cd755f2adc1d050c1ff /net | |
| parent | c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4 (diff) | |
| download | linux-ac6d141dc7d1d0eeec850d1b451dca83ce649684.tar.gz linux-ac6d141dc7d1d0eeec850d1b451dca83ce649684.tar.bz2 linux-ac6d141dc7d1d0eeec850d1b451dca83ce649684.zip | |
[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>
Diffstat (limited to 'net')
| -rw-r--r-- | net/netfilter/nfnetlink.c | 16 |
1 files changed, 2 insertions, 14 deletions
diff --git a/net/netfilter/nfnetlink.c b/net/netfilter/nfnetlink.c index 9ba6aa486f35..dec36abdf949 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 |