parse.c

/*
 * (C) 2006-2007 by Pablo Neira Ayuso <pablo@netfilter.org>
 *
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 */

#include "internal/internal.h"

int __parse_expect_message_type(const struct nlmsghdr *nlh)
{
        u_int16_t type = NFNL_MSG_TYPE(nlh->nlmsg_type);
        u_int16_t flags = nlh->nlmsg_flags;
        int ret = NFCT_T_UNKNOWN;

        if (type == IPCTNL_MSG_EXP_NEW) {
                if (flags & (NLM_F_CREATE|NLM_F_EXCL))
                        ret = NFCT_T_NEW;
                else
                        ret = NFCT_T_UPDATE;
        } else if (type == IPCTNL_MSG_EXP_DELETE)
                ret = NFCT_T_DESTROY;

        return ret;
}

void __parse_expect(const struct nlmsghdr *nlh,
                    struct nfattr *cda[],
                    struct nf_expect *exp)
{
        struct nfgenmsg *nfhdr = NLMSG_DATA(nlh);

        /* XXX: this is ugly, clean it up, please */
        exp->expected.tuple[__DIR_ORIG].l3protonum = nfhdr->nfgen_family;
        set_bit(ATTR_ORIG_L3PROTO, exp->expected.set);

        exp->mask.tuple[__DIR_REPL].l3protonum = nfhdr->nfgen_family;
        set_bit(ATTR_ORIG_L3PROTO, exp->mask.set);

        if (cda[CTA_EXPECT_TUPLE-1])
                __parse_tuple(cda[CTA_EXPECT_TUPLE-1], 
                              &exp->expected.tuple[__DIR_ORIG],
                              __DIR_ORIG,
                              exp->set);

        if (cda[CTA_EXPECT_MASK-1])
                __parse_tuple(cda[CTA_EXPECT_MASK-1], 
                              &exp->mask.tuple[__DIR_ORIG], 
                              __DIR_ORIG,
                              exp->set);

        if (cda[CTA_EXPECT_TIMEOUT-1]) {
                exp->timeout = 
                      ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_EXPECT_TIMEOUT-1]));
                set_bit(ATTR_EXP_TIMEOUT, exp->set);
        }

        if (cda[CTA_EXPECT_ZONE-1]) {
                exp->zone =
                      ntohs(*(u_int16_t *)NFA_DATA(cda[CTA_EXPECT_ZONE-1]));
                set_bit(ATTR_EXP_ZONE, exp->set);
        }
        if (cda[CTA_EXPECT_FLAGS-1]) {
                exp->flags =
                      ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_EXPECT_FLAGS-1]));
                set_bit(ATTR_EXP_FLAGS, exp->set);
        }
}