86 static int tcf_nat(struct sk_buff *skb, const struct tc_action *a,  in tcf_nat()  argument
109 	bstats_update(&p->tcf_bstats, skb);  in tcf_nat()
116 	noff = skb_network_offset(skb);  in tcf_nat()
117 	if (!pskb_may_pull(skb, sizeof(*iph) + noff))  in tcf_nat()
120 	iph = ip_hdr(skb);  in tcf_nat()
128 		if (skb_cloned(skb) &&  in tcf_nat()
129 		    !skb_clone_writable(skb, sizeof(*iph) + noff) &&  in tcf_nat()
130 		    pskb_expand_head(skb, 0, 0, GFP_ATOMIC))  in tcf_nat()
137 		iph = ip_hdr(skb);  in tcf_nat()
157 		if (!pskb_may_pull(skb, ihl + sizeof(*tcph) + noff) ||  in tcf_nat()
158 		    (skb_cloned(skb) &&  in tcf_nat()
159 		     !skb_clone_writable(skb, ihl + sizeof(*tcph) + noff) &&  in tcf_nat()
160 		     pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))  in tcf_nat()
163 		tcph = (void *)(skb_network_header(skb) + ihl);  in tcf_nat()
164 		inet_proto_csum_replace4(&tcph->check, skb, addr, new_addr, 1);  in tcf_nat()
171 		if (!pskb_may_pull(skb, ihl + sizeof(*udph) + noff) ||  in tcf_nat()
172 		    (skb_cloned(skb) &&  in tcf_nat()
173 		     !skb_clone_writable(skb, ihl + sizeof(*udph) + noff) &&  in tcf_nat()
174 		     pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))  in tcf_nat()
177 		udph = (void *)(skb_network_header(skb) + ihl);  in tcf_nat()
178 		if (udph->check || skb->ip_summed == CHECKSUM_PARTIAL) {  in tcf_nat()
179 			inet_proto_csum_replace4(&udph->check, skb, addr,  in tcf_nat()
190 		if (!pskb_may_pull(skb, ihl + sizeof(*icmph) + noff))  in tcf_nat()
193 		icmph = (void *)(skb_network_header(skb) + ihl);  in tcf_nat()
200 		if (!pskb_may_pull(skb, ihl + sizeof(*icmph) + sizeof(*iph) +  in tcf_nat()
204 		icmph = (void *)(skb_network_header(skb) + ihl);  in tcf_nat()
214 		if (skb_cloned(skb) &&  in tcf_nat()
215 		    !skb_clone_writable(skb, ihl + sizeof(*icmph) +  in tcf_nat()
217 		    pskb_expand_head(skb, 0, 0, GFP_ATOMIC))  in tcf_nat()
220 		icmph = (void *)(skb_network_header(skb) + ihl);  in tcf_nat()
232 		inet_proto_csum_replace4(&icmph->checksum, skb, addr, new_addr,  in tcf_nat()
250 static int tcf_nat_dump(struct sk_buff *skb, struct tc_action *a,  in tcf_nat_dump()  argument
253 	unsigned char *b = skb_tail_pointer(skb);  in tcf_nat_dump()
268 	if (nla_put(skb, TCA_NAT_PARMS, sizeof(opt), &opt))  in tcf_nat_dump()
273 	if (nla_put(skb, TCA_NAT_TM, sizeof(t), &t))  in tcf_nat_dump()
276 	return skb->len;  in tcf_nat_dump()
279 	nlmsg_trim(skb, b);  in tcf_nat_dump()