Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * mpls tunnels	An implementation mpls tunnels using the light weight tunnel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *		infrastructure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * Authors:	Roopa Prabhu, <roopa@cumulusnetworks.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/net.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/mpls.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/vmalloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <net/ip.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <net/dst.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <net/lwtunnel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <net/netevent.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <net/netns/generic.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <net/ip6_fib.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <net/route.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <net/mpls_iptunnel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <linux/mpls_iptunnel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include "internal.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) static const struct nla_policy mpls_iptunnel_policy[MPLS_IPTUNNEL_MAX + 1] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	[MPLS_IPTUNNEL_DST]	= { .len = sizeof(u32) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	[MPLS_IPTUNNEL_TTL]	= { .type = NLA_U8 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) static unsigned int mpls_encap_size(struct mpls_iptunnel_encap *en)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	/* The size of the layer 2.5 labels to be added for this route */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	return en->labels * sizeof(struct mpls_shim_hdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) static int mpls_xmit(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	struct mpls_iptunnel_encap *tun_encap_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	struct mpls_shim_hdr *hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	struct net_device *out_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	unsigned int hh_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	unsigned int new_header_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	unsigned int mtu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	struct dst_entry *dst = skb_dst(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	struct rtable *rt = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	struct rt6_info *rt6 = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	struct mpls_dev *out_mdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	struct net *net;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	bool bos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	unsigned int ttl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	/* Find the output device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	out_dev = dst->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	net = dev_net(out_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	skb_orphan(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	if (!mpls_output_possible(out_dev) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	    !dst->lwtstate || skb_warn_if_lro(skb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 		goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	skb_forward_csum(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	tun_encap_info = mpls_lwtunnel_encap(dst->lwtstate);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	/* Obtain the ttl using the following set of rules.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	 * LWT ttl propagation setting:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	 *  - disabled => use default TTL value from LWT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	 *  - enabled  => use TTL value from IPv4/IPv6 header
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	 *  - default  =>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	 *   Global ttl propagation setting:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	 *    - disabled => use default TTL value from global setting
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	 *    - enabled => use TTL value from IPv4/IPv6 header
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	if (dst->ops->family == AF_INET) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		if (tun_encap_info->ttl_propagate == MPLS_TTL_PROP_DISABLED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 			ttl = tun_encap_info->default_ttl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 		else if (tun_encap_info->ttl_propagate == MPLS_TTL_PROP_DEFAULT &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 			 !net->mpls.ip_ttl_propagate)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 			ttl = net->mpls.default_ttl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 			ttl = ip_hdr(skb)->ttl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 		rt = (struct rtable *)dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	} else if (dst->ops->family == AF_INET6) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 		if (tun_encap_info->ttl_propagate == MPLS_TTL_PROP_DISABLED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 			ttl = tun_encap_info->default_ttl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		else if (tun_encap_info->ttl_propagate == MPLS_TTL_PROP_DEFAULT &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 			 !net->mpls.ip_ttl_propagate)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 			ttl = net->mpls.default_ttl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 			ttl = ipv6_hdr(skb)->hop_limit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 		rt6 = (struct rt6_info *)dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 		goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	/* Verify the destination can hold the packet */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	new_header_size = mpls_encap_size(tun_encap_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	mtu = mpls_dev_mtu(out_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	if (mpls_pkt_too_big(skb, mtu - new_header_size))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	hh_len = LL_RESERVED_SPACE(out_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	if (!out_dev->header_ops)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 		hh_len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	/* Ensure there is enough space for the headers in the skb */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	if (skb_cow(skb, hh_len + new_header_size))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 		goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	skb_set_inner_protocol(skb, skb->protocol);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	skb_reset_inner_network_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	skb_push(skb, new_header_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	skb_reset_network_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	skb->dev = out_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	skb->protocol = htons(ETH_P_MPLS_UC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	/* Push the new labels */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	hdr = mpls_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	bos = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	for (i = tun_encap_info->labels - 1; i >= 0; i--) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 		hdr[i] = mpls_entry_encode(tun_encap_info->label[i],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 					   ttl, 0, bos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		bos = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	mpls_stats_inc_outucastpkts(out_dev, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	if (rt) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 		if (rt->rt_gw_family == AF_INET6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 			err = neigh_xmit(NEIGH_ND_TABLE, out_dev, &rt->rt_gw6,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 					 skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 			err = neigh_xmit(NEIGH_ARP_TABLE, out_dev, &rt->rt_gw4,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 					 skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	} else if (rt6) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 		if (ipv6_addr_v4mapped(&rt6->rt6i_gateway)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 			/* 6PE (RFC 4798) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 			err = neigh_xmit(NEIGH_ARP_TABLE, out_dev, &rt6->rt6i_gateway.s6_addr32[3],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 					 skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 		} else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 			err = neigh_xmit(NEIGH_ND_TABLE, out_dev, &rt6->rt6i_gateway,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 					 skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		net_dbg_ratelimited("%s: packet transmission failed: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 				    __func__, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	return LWTUNNEL_XMIT_DONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) drop:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	out_mdev = out_dev ? mpls_dev_get(out_dev) : NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	if (out_mdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 		MPLS_INC_STATS(out_mdev, tx_errors);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) static int mpls_build_state(struct net *net, struct nlattr *nla,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 			    unsigned int family, const void *cfg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 			    struct lwtunnel_state **ts,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 			    struct netlink_ext_ack *extack)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	struct mpls_iptunnel_encap *tun_encap_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	struct nlattr *tb[MPLS_IPTUNNEL_MAX + 1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	struct lwtunnel_state *newts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	u8 n_labels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	ret = nla_parse_nested_deprecated(tb, MPLS_IPTUNNEL_MAX, nla,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 					  mpls_iptunnel_policy, extack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	if (!tb[MPLS_IPTUNNEL_DST]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		NL_SET_ERR_MSG(extack, "MPLS_IPTUNNEL_DST attribute is missing");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	/* determine number of labels */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	if (nla_get_labels(tb[MPLS_IPTUNNEL_DST], MAX_NEW_LABELS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 			   &n_labels, NULL, extack))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	newts = lwtunnel_state_alloc(struct_size(tun_encap_info, label,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 						 n_labels));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	if (!newts)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	tun_encap_info = mpls_lwtunnel_encap(newts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	ret = nla_get_labels(tb[MPLS_IPTUNNEL_DST], n_labels,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 			     &tun_encap_info->labels, tun_encap_info->label,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 			     extack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		goto errout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	tun_encap_info->ttl_propagate = MPLS_TTL_PROP_DEFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	if (tb[MPLS_IPTUNNEL_TTL]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 		tun_encap_info->default_ttl = nla_get_u8(tb[MPLS_IPTUNNEL_TTL]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		/* TTL 0 implies propagate from IP header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 		tun_encap_info->ttl_propagate = tun_encap_info->default_ttl ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 			MPLS_TTL_PROP_DISABLED :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 			MPLS_TTL_PROP_ENABLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	newts->type = LWTUNNEL_ENCAP_MPLS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	newts->flags |= LWTUNNEL_STATE_XMIT_REDIRECT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	newts->headroom = mpls_encap_size(tun_encap_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	*ts = newts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) errout:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	kfree(newts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	*ts = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) static int mpls_fill_encap_info(struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 				struct lwtunnel_state *lwtstate)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	struct mpls_iptunnel_encap *tun_encap_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	tun_encap_info = mpls_lwtunnel_encap(lwtstate);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	if (nla_put_labels(skb, MPLS_IPTUNNEL_DST, tun_encap_info->labels,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 			   tun_encap_info->label))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 		goto nla_put_failure;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	if (tun_encap_info->ttl_propagate != MPLS_TTL_PROP_DEFAULT &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	    nla_put_u8(skb, MPLS_IPTUNNEL_TTL, tun_encap_info->default_ttl))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 		goto nla_put_failure;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) nla_put_failure:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	return -EMSGSIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) static int mpls_encap_nlsize(struct lwtunnel_state *lwtstate)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	struct mpls_iptunnel_encap *tun_encap_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	int nlsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	tun_encap_info = mpls_lwtunnel_encap(lwtstate);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	nlsize = nla_total_size(tun_encap_info->labels * 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	if (tun_encap_info->ttl_propagate != MPLS_TTL_PROP_DEFAULT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 		nlsize += nla_total_size(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	return nlsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) static int mpls_encap_cmp(struct lwtunnel_state *a, struct lwtunnel_state *b)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	struct mpls_iptunnel_encap *a_hdr = mpls_lwtunnel_encap(a);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	struct mpls_iptunnel_encap *b_hdr = mpls_lwtunnel_encap(b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	int l;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	if (a_hdr->labels != b_hdr->labels ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	    a_hdr->ttl_propagate != b_hdr->ttl_propagate ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	    a_hdr->default_ttl != b_hdr->default_ttl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	for (l = 0; l < a_hdr->labels; l++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 		if (a_hdr->label[l] != b_hdr->label[l])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 			return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) static const struct lwtunnel_encap_ops mpls_iptun_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	.build_state = mpls_build_state,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	.xmit = mpls_xmit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	.fill_encap = mpls_fill_encap_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	.get_encap_size = mpls_encap_nlsize,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	.cmp_encap = mpls_encap_cmp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	.owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) static int __init mpls_iptunnel_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	return lwtunnel_encap_add_ops(&mpls_iptun_ops, LWTUNNEL_ENCAP_MPLS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) module_init(mpls_iptunnel_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) static void __exit mpls_iptunnel_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	lwtunnel_encap_del_ops(&mpls_iptun_ops, LWTUNNEL_ENCAP_MPLS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) module_exit(mpls_iptunnel_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) MODULE_ALIAS_RTNL_LWT(MPLS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) MODULE_SOFTDEP("post: mpls_gso");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) MODULE_DESCRIPTION("MultiProtocol Label Switching IP Tunnels");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) MODULE_LICENSE("GPL v2");