1 // SPDX-License-Identifier: GPL-2.0-or-later
30 static unsigned int mpls_encap_size(struct mpls_iptunnel_encap *en)  in mpls_encap_size()  argument
33 	return en->labels * sizeof(struct mpls_shim_hdr);  in mpls_encap_size()
55 	out_dev = dst->dev;  in mpls_xmit()
61 	    !dst->lwtstate || skb_warn_if_lro(skb))  in mpls_xmit()
66 	tun_encap_info = mpls_lwtunnel_encap(dst->lwtstate);  in mpls_xmit()
71 	 *  - disabled => use default TTL value from LWT  in mpls_xmit()
72 	 *  - enabled  => use TTL value from IPv4/IPv6 header  in mpls_xmit()
73 	 *  - default  =>  in mpls_xmit()
74 	 *   Global ttl propagation setting:  in mpls_xmit()
75 	 *    - disabled => use default TTL value from global setting  in mpls_xmit()
76 	 *    - enabled => use TTL value from IPv4/IPv6 header  in mpls_xmit()
78 	if (dst->ops->family == AF_INET) {  in mpls_xmit()
79 		if (tun_encap_info->ttl_propagate == MPLS_TTL_PROP_DISABLED)  in mpls_xmit()
80 			ttl = tun_encap_info->default_ttl;  in mpls_xmit()
81 		else if (tun_encap_info->ttl_propagate == MPLS_TTL_PROP_DEFAULT &&  in mpls_xmit()
82 			 !net->mpls.ip_ttl_propagate)  in mpls_xmit()
83 			ttl = net->mpls.default_ttl;  in mpls_xmit()
85 			ttl = ip_hdr(skb)->ttl;  in mpls_xmit()
87 	} else if (dst->ops->family == AF_INET6) {  in mpls_xmit()
88 		if (tun_encap_info->ttl_propagate == MPLS_TTL_PROP_DISABLED)  in mpls_xmit()
89 			ttl = tun_encap_info->default_ttl;  in mpls_xmit()
90 		else if (tun_encap_info->ttl_propagate == MPLS_TTL_PROP_DEFAULT &&  in mpls_xmit()
91 			 !net->mpls.ip_ttl_propagate)  in mpls_xmit()
92 			ttl = net->mpls.default_ttl;  in mpls_xmit()
94 			ttl = ipv6_hdr(skb)->hop_limit;  in mpls_xmit()
103 	if (mpls_pkt_too_big(skb, mtu - new_header_size))  in mpls_xmit()
107 	if (!out_dev->header_ops)  in mpls_xmit()
114 	skb_set_inner_protocol(skb, skb->protocol);  in mpls_xmit()
121 	skb->dev = out_dev;  in mpls_xmit()
122 	skb->protocol = htons(ETH_P_MPLS_UC);  in mpls_xmit()
127 	for (i = tun_encap_info->labels - 1; i >= 0; i--) {  in mpls_xmit()
128 		hdr[i] = mpls_entry_encode(tun_encap_info->label[i],  in mpls_xmit()
136 		if (rt->rt_gw_family == AF_INET6)  in mpls_xmit()
137 			err = neigh_xmit(NEIGH_ND_TABLE, out_dev, &rt->rt_gw6,  in mpls_xmit()
140 			err = neigh_xmit(NEIGH_ARP_TABLE, out_dev, &rt->rt_gw4,  in mpls_xmit()
143 		if (ipv6_addr_v4mapped(&rt6->rt6i_gateway)) {  in mpls_xmit()
145 			err = neigh_xmit(NEIGH_ARP_TABLE, out_dev, &rt6->rt6i_gateway.s6_addr32[3],  in mpls_xmit()
148 			err = neigh_xmit(NEIGH_ND_TABLE, out_dev, &rt6->rt6i_gateway,  in mpls_xmit()
162 	return -EINVAL;  in mpls_xmit()
183 		return -EINVAL;  in mpls_build_state()
189 		return -EINVAL;  in mpls_build_state()
194 		return -ENOMEM;  in mpls_build_state()
198 			     &tun_encap_info->labels, tun_encap_info->label,  in mpls_build_state()
203 	tun_encap_info->ttl_propagate = MPLS_TTL_PROP_DEFAULT;  in mpls_build_state()
206 		tun_encap_info->default_ttl = nla_get_u8(tb[MPLS_IPTUNNEL_TTL]);  in mpls_build_state()
208 		tun_encap_info->ttl_propagate = tun_encap_info->default_ttl ?  in mpls_build_state()
213 	newts->type = LWTUNNEL_ENCAP_MPLS;  in mpls_build_state()
214 	newts->flags |= LWTUNNEL_STATE_XMIT_REDIRECT;  in mpls_build_state()
215 	newts->headroom = mpls_encap_size(tun_encap_info);  in mpls_build_state()
235 	if (nla_put_labels(skb, MPLS_IPTUNNEL_DST, tun_encap_info->labels,  in mpls_fill_encap_info()
236 			   tun_encap_info->label))  in mpls_fill_encap_info()
239 	if (tun_encap_info->ttl_propagate != MPLS_TTL_PROP_DEFAULT &&  in mpls_fill_encap_info()
240 	    nla_put_u8(skb, MPLS_IPTUNNEL_TTL, tun_encap_info->default_ttl))  in mpls_fill_encap_info()
246 	return -EMSGSIZE;  in mpls_fill_encap_info()
256 	nlsize = nla_total_size(tun_encap_info->labels * 4);  in mpls_encap_nlsize()
258 	if (tun_encap_info->ttl_propagate != MPLS_TTL_PROP_DEFAULT)  in mpls_encap_nlsize()
270 	if (a_hdr->labels != b_hdr->labels ||  in mpls_encap_cmp()
271 	    a_hdr->ttl_propagate != b_hdr->ttl_propagate ||  in mpls_encap_cmp()
272 	    a_hdr->default_ttl != b_hdr->default_ttl)  in mpls_encap_cmp()
275 	for (l = 0; l < a_hdr->labels; l++)  in mpls_encap_cmp()
276 		if (a_hdr->label[l] != b_hdr->label[l])  in mpls_encap_cmp()