167 	u32 mtu;  in ip6_xmit()  local
223 	mtu = dst_mtu(dst);  in ip6_xmit()
224 	if ((skb->len <= mtu) || skb->ignore_df || skb_is_gso(skb)) {  in ip6_xmit()
232 	ipv6_local_error(sk, EMSGSIZE, fl6, mtu);  in ip6_xmit()
328 	unsigned int mtu;  in ip6_dst_mtu_forward()  local
332 		mtu = dst_metric_raw(dst, RTAX_MTU);  in ip6_dst_mtu_forward()
333 		if (mtu)  in ip6_dst_mtu_forward()
334 			return mtu;  in ip6_dst_mtu_forward()
337 	mtu = IPV6_MIN_MTU;  in ip6_dst_mtu_forward()
341 		mtu = idev->cnf.mtu6;  in ip6_dst_mtu_forward()
344 	return mtu;  in ip6_dst_mtu_forward()
347 static bool ip6_pkt_too_big(const struct sk_buff *skb, unsigned int mtu)  in ip6_pkt_too_big()  argument
349 	if (skb->len <= mtu)  in ip6_pkt_too_big()
353 	if (IP6CB(skb)->frag_max_size && IP6CB(skb)->frag_max_size > mtu)  in ip6_pkt_too_big()
359 	if (skb_is_gso(skb) && skb_gso_network_seglen(skb) <= mtu)  in ip6_pkt_too_big()
371 	u32 mtu;  in ip6_forward()  local
488 	mtu = ip6_dst_mtu_forward(dst);  in ip6_forward()
489 	if (mtu < IPV6_MIN_MTU)  in ip6_forward()
490 		mtu = IPV6_MIN_MTU;  in ip6_forward()
492 	if (ip6_pkt_too_big(skb, mtu)) {  in ip6_forward()
495 		icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);  in ip6_forward()
555 	unsigned int mtu, hlen, left, len;  in ip6_fragment()  local
565 	mtu = ip6_skb_dst_mtu(skb);  in ip6_fragment()
570 	if (unlikely(!skb->ignore_df && skb->len > mtu) ||  in ip6_fragment()
572 		      IP6CB(skb)->frag_max_size > mtu)) {  in ip6_fragment()
577 		icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);  in ip6_fragment()
584 	if (np && np->frag_size < mtu) {  in ip6_fragment()
586 			mtu = np->frag_size;  in ip6_fragment()
588 	mtu -= hlen + sizeof(struct frag_hdr);  in ip6_fragment()
594 		if (first_len - hlen > mtu ||  in ip6_fragment()
601 			if (frag->len > mtu ||  in ip6_fragment()
737 		if (len > mtu)  in ip6_fragment()
738 			len = mtu;  in ip6_fragment()
1069 			int transhdrlen, int mtu, unsigned int flags,  in ip6_ufo_append_data()  argument
1113 	skb_shinfo(skb)->gso_size = (mtu - fragheaderlen -  in ip6_ufo_append_data()
1136 static void ip6_append_data_mtu(unsigned int *mtu,  in ip6_append_data_mtu()  argument
1146 			*mtu = orig_mtu - rt->dst.header_len;  in ip6_append_data_mtu()
1153 			*mtu = orig_mtu;  in ip6_append_data_mtu()
1155 		*maxfraglen = ((*mtu - fragheaderlen) & ~7)  in ip6_append_data_mtu()
1166 	unsigned int mtu;  in ip6_setup_cork()  local
1211 		mtu = np->pmtudisc >= IPV6_PMTUDISC_PROBE ?  in ip6_setup_cork()
1212 		      rt->dst.dev->mtu : dst_mtu(&rt->dst);  in ip6_setup_cork()
1214 		mtu = np->pmtudisc >= IPV6_PMTUDISC_PROBE ?  in ip6_setup_cork()
1215 		      rt->dst.dev->mtu : dst_mtu(rt->dst.path);  in ip6_setup_cork()
1216 	if (np->frag_size < mtu) {  in ip6_setup_cork()
1218 			mtu = np->frag_size;  in ip6_setup_cork()
1220 	cork->base.fragsize = mtu;  in ip6_setup_cork()
1240 	unsigned int maxfraglen, fragheaderlen, mtu, orig_mtu;  in __ip6_append_data()  local
1259 	mtu = cork->fragsize;  in __ip6_append_data()
1260 	orig_mtu = mtu;  in __ip6_append_data()
1266 	maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen -  in __ip6_append_data()
1269 	if (mtu <= sizeof(struct ipv6hdr) + IPV6_MAXPLEN) {  in __ip6_append_data()
1281 			maxnonfragsize = mtu;  in __ip6_append_data()
1284 		if ((cork->length + length > mtu - headersize) && dontfrag &&  in __ip6_append_data()
1287 			ipv6_local_rxpmtu(sk, fl6, mtu - headersize +  in __ip6_append_data()
1295 					 mtu - headersize +  in __ip6_append_data()
1314 	    length + fragheaderlen < mtu &&  in __ip6_append_data()
1335 	if (((length > mtu) ||  in __ip6_append_data()
1342 					  transhdrlen, mtu, flags, rt);  in __ip6_append_data()
1353 		copy = (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - skb->len;  in __ip6_append_data()
1371 				ip6_append_data_mtu(&mtu, &maxfraglen,  in __ip6_append_data()
1383 …if (datalen > (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - fraghe…  in __ip6_append_data()
1387 				alloclen = mtu;  in __ip6_append_data()