1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * mpls tunnels	An implementation mpls tunnels using the light weight tunnel
33 	return en->labels * sizeof(struct mpls_shim_hdr);  in mpls_encap_size()
55 	out_dev = dst->dev;  in mpls_xmit()
59 	    !dst->lwtstate || skb_warn_if_lro(skb))  in mpls_xmit()
64 	tun_encap_info = mpls_lwtunnel_encap(dst->lwtstate);  in mpls_xmit()
69 	 *  - disabled => use default TTL value from LWT  in mpls_xmit()
70 	 *  - enabled  => use TTL value from IPv4/IPv6 header  in mpls_xmit()
71 	 *  - default  =>  in mpls_xmit()
73 	 *    - disabled => use default TTL value from global setting  in mpls_xmit()
74 	 *    - enabled => use TTL value from IPv4/IPv6 header  in mpls_xmit()
76 	if (dst->ops->family == AF_INET) {  in mpls_xmit()
77 		if (tun_encap_info->ttl_propagate == MPLS_TTL_PROP_DISABLED)  in mpls_xmit()
78 			ttl = tun_encap_info->default_ttl;  in mpls_xmit()
79 		else if (tun_encap_info->ttl_propagate == MPLS_TTL_PROP_DEFAULT &&  in mpls_xmit()
80 			 !net->mpls.ip_ttl_propagate)  in mpls_xmit()
81 			ttl = net->mpls.default_ttl;  in mpls_xmit()
83 			ttl = ip_hdr(skb)->ttl;  in mpls_xmit()
85 	} else if (dst->ops->family == AF_INET6) {  in mpls_xmit()
86 		if (tun_encap_info->ttl_propagate == MPLS_TTL_PROP_DISABLED)  in mpls_xmit()
87 			ttl = tun_encap_info->default_ttl;  in mpls_xmit()
88 		else if (tun_encap_info->ttl_propagate == MPLS_TTL_PROP_DEFAULT &&  in mpls_xmit()
89 			 !net->mpls.ip_ttl_propagate)  in mpls_xmit()
90 			ttl = net->mpls.default_ttl;  in mpls_xmit()
92 			ttl = ipv6_hdr(skb)->hop_limit;  in mpls_xmit()
101 	if (mpls_pkt_too_big(skb, mtu - new_header_size))  in mpls_xmit()
105 	if (!out_dev->header_ops)  in mpls_xmit()
112 	skb_set_inner_protocol(skb, skb->protocol);  in mpls_xmit()
119 	skb->dev = out_dev;  in mpls_xmit()
120 	skb->protocol = htons(ETH_P_MPLS_UC);  in mpls_xmit()
125 	for (i = tun_encap_info->labels - 1; i >= 0; i--) {  in mpls_xmit()
126 		hdr[i] = mpls_entry_encode(tun_encap_info->label[i],  in mpls_xmit()
134 		if (rt->rt_gw_family == AF_INET6)  in mpls_xmit()
135 			err = neigh_xmit(NEIGH_ND_TABLE, out_dev, &rt->rt_gw6,  in mpls_xmit()
138 			err = neigh_xmit(NEIGH_ARP_TABLE, out_dev, &rt->rt_gw4,  in mpls_xmit()
141 		if (ipv6_addr_v4mapped(&rt6->rt6i_gateway)) {  in mpls_xmit()
143 			err = neigh_xmit(NEIGH_ARP_TABLE, out_dev, &rt6->rt6i_gateway.s6_addr32[3],  in mpls_xmit()
146 			err = neigh_xmit(NEIGH_ND_TABLE, out_dev, &rt6->rt6i_gateway,  in mpls_xmit()
160 	return -EINVAL;  in mpls_xmit()
181 		return -EINVAL;  in mpls_build_state()
187 		return -EINVAL;  in mpls_build_state()
192 		return -ENOMEM;  in mpls_build_state()
196 			     &tun_encap_info->labels, tun_encap_info->label,  in mpls_build_state()
201 	tun_encap_info->ttl_propagate = MPLS_TTL_PROP_DEFAULT;  in mpls_build_state()
204 		tun_encap_info->default_ttl = nla_get_u8(tb[MPLS_IPTUNNEL_TTL]);  in mpls_build_state()
206 		tun_encap_info->ttl_propagate = tun_encap_info->default_ttl ?  in mpls_build_state()
211 	newts->type = LWTUNNEL_ENCAP_MPLS;  in mpls_build_state()
212 	newts->flags |= LWTUNNEL_STATE_XMIT_REDIRECT;  in mpls_build_state()
213 	newts->headroom = mpls_encap_size(tun_encap_info);  in mpls_build_state()
233 	if (nla_put_labels(skb, MPLS_IPTUNNEL_DST, tun_encap_info->labels,  in mpls_fill_encap_info()
234 			   tun_encap_info->label))  in mpls_fill_encap_info()
237 	if (tun_encap_info->ttl_propagate != MPLS_TTL_PROP_DEFAULT &&  in mpls_fill_encap_info()
238 	    nla_put_u8(skb, MPLS_IPTUNNEL_TTL, tun_encap_info->default_ttl))  in mpls_fill_encap_info()
244 	return -EMSGSIZE;  in mpls_fill_encap_info()
254 	nlsize = nla_total_size(tun_encap_info->labels * 4);  in mpls_encap_nlsize()
256 	if (tun_encap_info->ttl_propagate != MPLS_TTL_PROP_DEFAULT)  in mpls_encap_nlsize()
268 	if (a_hdr->labels != b_hdr->labels ||  in mpls_encap_cmp()
269 	    a_hdr->ttl_propagate != b_hdr->ttl_propagate ||  in mpls_encap_cmp()
270 	    a_hdr->default_ttl != b_hdr->default_ttl)  in mpls_encap_cmp()
273 	for (l = 0; l < a_hdr->labels; l++)  in mpls_encap_cmp()
274 		if (a_hdr->label[l] != b_hdr->label[l])  in mpls_encap_cmp()