144 				    struct sk_buff *skb, unsigned int mtu)  in ip6_finish_output_gso_slowpath_drop()  argument
152 	 * egress MTU.  in ip6_finish_output_gso_slowpath_drop()
167 		/* Last GSO segment can be smaller than gso_size (and MTU).  in ip6_finish_output_gso_slowpath_drop()
171 		err = segs->len > mtu ?  in ip6_finish_output_gso_slowpath_drop()
182 				 struct sk_buff *skb, unsigned int mtu)  in ip6_finish_output_gso()  argument
185 	    !skb_gso_validate_network_len(skb, mtu))  in ip6_finish_output_gso()
186 		return ip6_finish_output_gso_slowpath_drop(net, sk, skb, mtu);  in ip6_finish_output_gso()
193 	unsigned int mtu;  in __ip6_finish_output()  local
203 	mtu = ip6_skb_dst_mtu(skb);  in __ip6_finish_output()
205 		return ip6_finish_output_gso(net, sk, skb, mtu);  in __ip6_finish_output()
207 	if (skb->len > mtu ||  in __ip6_finish_output()
279 	u32 mtu;  in ip6_xmit()  local
344 	mtu = dst_mtu(dst);  in ip6_xmit()
345 	if ((skb->len <= mtu) || skb->ignore_df || skb_is_gso(skb)) {  in ip6_xmit()
367 	ipv6_local_error((struct sock *)sk, EMSGSIZE, fl6, mtu);  in ip6_xmit()
475 static bool ip6_pkt_too_big(const struct sk_buff *skb, unsigned int mtu)  in ip6_pkt_too_big()  argument
477 	if (skb->len <= mtu)  in ip6_pkt_too_big()
481 	if (IP6CB(skb)->frag_max_size && IP6CB(skb)->frag_max_size > mtu)  in ip6_pkt_too_big()
487 	if (skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu))  in ip6_pkt_too_big()
501 	u32 mtu;  in ip6_forward()  local
633 	mtu = ip6_dst_mtu_maybe_forward(dst, true);  in ip6_forward()
634 	if (mtu < IPV6_MIN_MTU)  in ip6_forward()
635 		mtu = IPV6_MIN_MTU;  in ip6_forward()
637 	if (ip6_pkt_too_big(skb, mtu)) {  in ip6_forward()
640 		icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);  in ip6_forward()
758 void ip6_frag_init(struct sk_buff *skb, unsigned int hlen, unsigned int mtu,  in ip6_frag_init()  argument
767 	state->mtu = mtu;  in ip6_frag_init()
787 	/* IF: it doesn't fit, use 'mtu' - the data space left */  in ip6_frag_next()
788 	if (len > state->mtu)  in ip6_frag_next()
789 		len = state->mtu;  in ip6_frag_next()
864 	unsigned int mtu, hlen, nexthdr_offset;  in ip6_fragment()  local
877 	mtu = ip6_skb_dst_mtu(skb);  in ip6_fragment()
879 	/* We must not fragment if the socket is set to force MTU discovery  in ip6_fragment()
882 	if (unlikely(!skb->ignore_df && skb->len > mtu))  in ip6_fragment()
886 		if (IP6CB(skb)->frag_max_size > mtu)  in ip6_fragment()
890 		mtu = IP6CB(skb)->frag_max_size;  in ip6_fragment()
891 		if (mtu < IPV6_MIN_MTU)  in ip6_fragment()
892 			mtu = IPV6_MIN_MTU;  in ip6_fragment()
898 		if (frag_size && frag_size < mtu)  in ip6_fragment()
899 			mtu = frag_size;  in ip6_fragment()
901 	if (mtu < hlen + sizeof(struct frag_hdr) + 8)  in ip6_fragment()
903 	mtu -= hlen + sizeof(struct frag_hdr);  in ip6_fragment()
919 		if (first_len - hlen > mtu ||  in ip6_fragment()
927 			if (frag->len > mtu ||  in ip6_fragment()
1001 	ip6_frag_init(skb, hlen, mtu, rt->dst.dev->needed_tailroom,  in ip6_fragment()
1033 	icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);  in ip6_fragment()
1308 static void ip6_append_data_mtu(unsigned int *mtu,  in ip6_append_data_mtu()  argument
1318 			*mtu = orig_mtu - rt->dst.header_len;  in ip6_append_data_mtu()
1325 			*mtu = orig_mtu;  in ip6_append_data_mtu()
1327 		*maxfraglen = ((*mtu - fragheaderlen) & ~7)  in ip6_append_data_mtu()
1337 	unsigned int mtu, frag_size;  in ip6_setup_cork()  local
1381 		mtu = READ_ONCE(np->pmtudisc) >= IPV6_PMTUDISC_PROBE ?  in ip6_setup_cork()
1382 		      READ_ONCE(rt->dst.dev->mtu) : dst_mtu(&rt->dst);  in ip6_setup_cork()
1384 		mtu = READ_ONCE(np->pmtudisc) >= IPV6_PMTUDISC_PROBE ?  in ip6_setup_cork()
1385 			READ_ONCE(rt->dst.dev->mtu) : dst_mtu(xfrm_dst_path(&rt->dst));  in ip6_setup_cork()
1388 	if (frag_size && frag_size < mtu)  in ip6_setup_cork()
1389 		mtu = frag_size;  in ip6_setup_cork()
1391 	cork->base.fragsize = mtu;  in ip6_setup_cork()
1416 	unsigned int maxfraglen, fragheaderlen, mtu, orig_mtu, pmtu;  in __ip6_append_data()  local
1440 	mtu = cork->gso_size ? IP6_MAX_MTU : cork->fragsize;  in __ip6_append_data()
1441 	orig_mtu = mtu;  in __ip6_append_data()
1452 	if (mtu <= fragheaderlen ||  in __ip6_append_data()
1453 	    ((mtu - fragheaderlen) & ~7) + fragheaderlen <= sizeof(struct frag_hdr))  in __ip6_append_data()
1456 	maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen -  in __ip6_append_data()
1462 	if (headersize + transhdrlen > mtu)  in __ip6_append_data()
1465 	if (cork->length + length > mtu - headersize && ipc6->dontfrag &&  in __ip6_append_data()
1469 		ipv6_local_rxpmtu(sk, fl6, mtu - headersize +  in __ip6_append_data()
1477 		maxnonfragsize = mtu;  in __ip6_append_data()
1481 		pmtu = max_t(int, mtu - headersize + sizeof(struct ipv6hdr), 0);  in __ip6_append_data()
1491 	    length <= mtu - headersize &&  in __ip6_append_data()
1544 	 * Use MTU if total length of the message fits into the MTU.  in __ip6_append_data()
1564 		copy = (cork->length <= mtu ? mtu : maxfraglen) - skb->len;  in __ip6_append_data()
1581 			/* update mtu and maxfraglen if necessary */  in __ip6_append_data()
1583 				ip6_append_data_mtu(&mtu, &maxfraglen,  in __ip6_append_data()
1590 			 * If remaining data exceeds the mtu,  in __ip6_append_data()
1595 			if (datalen > (cork->length <= mtu ? mtu : maxfraglen) - fragheaderlen)  in __ip6_append_data()
1606 			 * (without MSG_MORE) fits into the MTU.  in __ip6_append_data()
1612 				alloclen = mtu;  in __ip6_append_data()