168 	u32 mtu;  in ip6_xmit()  local
227 	mtu = dst_mtu(dst);  in ip6_xmit()
228 	if ((skb->len <= mtu) || skb->ignore_df || skb_is_gso(skb)) {  in ip6_xmit()
243 	ipv6_local_error((struct sock *)sk, EMSGSIZE, fl6, mtu);  in ip6_xmit()
341 	unsigned int mtu;  in ip6_dst_mtu_forward()  local
345 		mtu = dst_metric_raw(dst, RTAX_MTU);  in ip6_dst_mtu_forward()
346 		if (mtu)  in ip6_dst_mtu_forward()
347 			return mtu;  in ip6_dst_mtu_forward()
350 	mtu = IPV6_MIN_MTU;  in ip6_dst_mtu_forward()
354 		mtu = idev->cnf.mtu6;  in ip6_dst_mtu_forward()
357 	return mtu;  in ip6_dst_mtu_forward()
360 static bool ip6_pkt_too_big(const struct sk_buff *skb, unsigned int mtu)  in ip6_pkt_too_big()  argument
362 	if (skb->len <= mtu)  in ip6_pkt_too_big()
366 	if (IP6CB(skb)->frag_max_size && IP6CB(skb)->frag_max_size > mtu)  in ip6_pkt_too_big()
372 	if (skb_is_gso(skb) && skb_gso_network_seglen(skb) <= mtu)  in ip6_pkt_too_big()
384 	u32 mtu;  in ip6_forward()  local
501 	mtu = ip6_dst_mtu_forward(dst);  in ip6_forward()
502 	if (mtu < IPV6_MIN_MTU)  in ip6_forward()
503 		mtu = IPV6_MIN_MTU;  in ip6_forward()
505 	if (ip6_pkt_too_big(skb, mtu)) {  in ip6_forward()
508 		icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);  in ip6_forward()
568 	unsigned int mtu, hlen, left, len;  in ip6_fragment()  local
577 	mtu = ip6_skb_dst_mtu(skb);  in ip6_fragment()
582 	if (unlikely(!skb->ignore_df && skb->len > mtu))  in ip6_fragment()
586 		if (IP6CB(skb)->frag_max_size > mtu)  in ip6_fragment()
590 		mtu = IP6CB(skb)->frag_max_size;  in ip6_fragment()
591 		if (mtu < IPV6_MIN_MTU)  in ip6_fragment()
592 			mtu = IPV6_MIN_MTU;  in ip6_fragment()
595 	if (np && np->frag_size < mtu) {  in ip6_fragment()
597 			mtu = np->frag_size;  in ip6_fragment()
599 	if (mtu < hlen + sizeof(struct frag_hdr) + 8)  in ip6_fragment()
601 	mtu -= hlen + sizeof(struct frag_hdr);  in ip6_fragment()
615 		if (first_len - hlen > mtu ||  in ip6_fragment()
623 			if (frag->len > mtu ||  in ip6_fragment()
754 		if (len > mtu)  in ip6_fragment()
755 			len = mtu;  in ip6_fragment()
839 	icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);  in ip6_fragment()
1089 			int exthdrlen, int transhdrlen, int mtu,  in ip6_ufo_append_data()  argument
1132 	skb_shinfo(skb)->gso_size = (mtu - fragheaderlen -  in ip6_ufo_append_data()
1156 static void ip6_append_data_mtu(unsigned int *mtu,  in ip6_append_data_mtu()  argument
1166 			*mtu = orig_mtu - rt->dst.header_len;  in ip6_append_data_mtu()
1173 			*mtu = orig_mtu;  in ip6_append_data_mtu()
1175 		*maxfraglen = ((*mtu - fragheaderlen) & ~7)  in ip6_append_data_mtu()
1186 	unsigned int mtu;  in ip6_setup_cork()  local
1231 		mtu = np->pmtudisc >= IPV6_PMTUDISC_PROBE ?  in ip6_setup_cork()
1232 		      rt->dst.dev->mtu : dst_mtu(&rt->dst);  in ip6_setup_cork()
1234 		mtu = np->pmtudisc >= IPV6_PMTUDISC_PROBE ?  in ip6_setup_cork()
1235 		      rt->dst.dev->mtu : dst_mtu(rt->dst.path);  in ip6_setup_cork()
1236 	if (np->frag_size < mtu) {  in ip6_setup_cork()
1238 			mtu = np->frag_size;  in ip6_setup_cork()
1240 	cork->base.fragsize = mtu;  in ip6_setup_cork()
1260 	unsigned int maxfraglen, fragheaderlen, mtu, orig_mtu;  in __ip6_append_data()  local
1280 	mtu = cork->fragsize;  in __ip6_append_data()
1281 	orig_mtu = mtu;  in __ip6_append_data()
1287 	maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen -  in __ip6_append_data()
1296 	if (cork->length + length > mtu - headersize && dontfrag &&  in __ip6_append_data()
1299 		ipv6_local_rxpmtu(sk, fl6, mtu - headersize +  in __ip6_append_data()
1307 		maxnonfragsize = mtu;  in __ip6_append_data()
1312 				 mtu - headersize +  in __ip6_append_data()
1322 	    length < mtu - headersize &&  in __ip6_append_data()
1351 	if (((length > mtu) ||  in __ip6_append_data()
1358 					  transhdrlen, mtu, flags, fl6);  in __ip6_append_data()
1369 		copy = (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - skb->len;  in __ip6_append_data()
1387 				ip6_append_data_mtu(&mtu, &maxfraglen,  in __ip6_append_data()
1399 …if (datalen > (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - fraghe…  in __ip6_append_data()
1403 				alloclen = mtu;  in __ip6_append_data()