141 				    struct sk_buff *skb, unsigned int mtu)  in ip6_finish_output_gso_slowpath_drop()  argument
149 	 * egress MTU.  in ip6_finish_output_gso_slowpath_drop()
174 	unsigned int mtu;  in __ip6_finish_output()  local
184 	mtu = ip6_skb_dst_mtu(skb);  in __ip6_finish_output()
187 	    !skb_gso_validate_network_len(skb, mtu))  in __ip6_finish_output()
188 		return ip6_finish_output_gso_slowpath_drop(net, sk, skb, mtu);  in __ip6_finish_output()
190 	if ((skb->len > mtu && !skb_is_gso(skb)) ||  in __ip6_finish_output()
264 	u32 mtu;  in ip6_xmit()  local
329 	mtu = dst_mtu(dst);  in ip6_xmit()
330 	if ((skb->len <= mtu) || skb->ignore_df || skb_is_gso(skb)) {  in ip6_xmit()
352 	ipv6_local_error((struct sock *)sk, EMSGSIZE, fl6, mtu);  in ip6_xmit()
466 static bool ip6_pkt_too_big(const struct sk_buff *skb, unsigned int mtu)  in ip6_pkt_too_big()  argument
468 	if (skb->len <= mtu)  in ip6_pkt_too_big()
472 	if (IP6CB(skb)->frag_max_size && IP6CB(skb)->frag_max_size > mtu)  in ip6_pkt_too_big()
478 	if (skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu))  in ip6_pkt_too_big()
492 	u32 mtu;  in ip6_forward()  local
609 	mtu = ip6_dst_mtu_maybe_forward(dst, true);  in ip6_forward()
610 	if (mtu < IPV6_MIN_MTU)  in ip6_forward()
611 		mtu = IPV6_MIN_MTU;  in ip6_forward()
613 	if (ip6_pkt_too_big(skb, mtu)) {  in ip6_forward()
616 		icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);  in ip6_forward()
734 void ip6_frag_init(struct sk_buff *skb, unsigned int hlen, unsigned int mtu,  in ip6_frag_init()  argument
743 	state->mtu = mtu;  in ip6_frag_init()
763 	/* IF: it doesn't fit, use 'mtu' - the data space left */  in ip6_frag_next()
764 	if (len > state->mtu)  in ip6_frag_next()
765 		len = state->mtu;  in ip6_frag_next()
840 	unsigned int mtu, hlen, nexthdr_offset;  in ip6_fragment()  local
853 	mtu = ip6_skb_dst_mtu(skb);  in ip6_fragment()
855 	/* We must not fragment if the socket is set to force MTU discovery  in ip6_fragment()
858 	if (unlikely(!skb->ignore_df && skb->len > mtu))  in ip6_fragment()
862 		if (IP6CB(skb)->frag_max_size > mtu)  in ip6_fragment()
866 		mtu = IP6CB(skb)->frag_max_size;  in ip6_fragment()
867 		if (mtu < IPV6_MIN_MTU)  in ip6_fragment()
868 			mtu = IPV6_MIN_MTU;  in ip6_fragment()
871 	if (np && np->frag_size < mtu) {  in ip6_fragment()
873 			mtu = np->frag_size;  in ip6_fragment()
875 	if (mtu < hlen + sizeof(struct frag_hdr) + 8)  in ip6_fragment()
877 	mtu -= hlen + sizeof(struct frag_hdr);  in ip6_fragment()
893 		if (first_len - hlen > mtu ||  in ip6_fragment()
901 			if (frag->len > mtu ||  in ip6_fragment()
975 	ip6_frag_init(skb, hlen, mtu, rt->dst.dev->needed_tailroom,  in ip6_fragment()
1010 	icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);  in ip6_fragment()
1353 static void ip6_append_data_mtu(unsigned int *mtu,  in ip6_append_data_mtu()  argument
1363 			*mtu = orig_mtu - rt->dst.header_len;  in ip6_append_data_mtu()
1370 			*mtu = orig_mtu;  in ip6_append_data_mtu()
1372 		*maxfraglen = ((*mtu - fragheaderlen) & ~7)  in ip6_append_data_mtu()
1382 	unsigned int mtu;  in ip6_setup_cork()  local
1426 		mtu = np->pmtudisc >= IPV6_PMTUDISC_PROBE ?  in ip6_setup_cork()
1427 		      READ_ONCE(rt->dst.dev->mtu) : dst_mtu(&rt->dst);  in ip6_setup_cork()
1429 		mtu = np->pmtudisc >= IPV6_PMTUDISC_PROBE ?  in ip6_setup_cork()
1430 			READ_ONCE(rt->dst.dev->mtu) : dst_mtu(xfrm_dst_path(&rt->dst));  in ip6_setup_cork()
1431 	if (np->frag_size < mtu) {  in ip6_setup_cork()
1433 			mtu = np->frag_size;  in ip6_setup_cork()
1435 	cork->base.fragsize = mtu;  in ip6_setup_cork()
1463 	unsigned int maxfraglen, fragheaderlen, mtu, orig_mtu, pmtu;  in __ip6_append_data()  local
1487 	mtu = cork->gso_size ? IP6_MAX_MTU : cork->fragsize;  in __ip6_append_data()
1488 	orig_mtu = mtu;  in __ip6_append_data()
1505 	if (mtu <= fragheaderlen ||  in __ip6_append_data()
1506 	    ((mtu - fragheaderlen) & ~7) + fragheaderlen <= sizeof(struct frag_hdr))  in __ip6_append_data()
1509 	maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen -  in __ip6_append_data()
1515 	if (headersize + transhdrlen > mtu)  in __ip6_append_data()
1518 	if (cork->length + length > mtu - headersize && ipc6->dontfrag &&  in __ip6_append_data()
1522 		ipv6_local_rxpmtu(sk, fl6, mtu - headersize +  in __ip6_append_data()
1530 		maxnonfragsize = mtu;  in __ip6_append_data()
1534 		pmtu = max_t(int, mtu - headersize + sizeof(struct ipv6hdr), 0);  in __ip6_append_data()
1544 	    length <= mtu - headersize &&  in __ip6_append_data()
1583 	 * Use MTU if total length of the message fits into the MTU.  in __ip6_append_data()
1603 		copy = (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - skb->len;  in __ip6_append_data()
1620 			/* update mtu and maxfraglen if necessary */  in __ip6_append_data()
1622 				ip6_append_data_mtu(&mtu, &maxfraglen,  in __ip6_append_data()
1629 			 * If remaining data exceeds the mtu,  in __ip6_append_data()
1634 …if (datalen > (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - fraghe…  in __ip6_append_data()
1645 			 * (without MSG_MORE) fits into the MTU.  in __ip6_append_data()
1651 				alloclen = mtu;  in __ip6_append_data()