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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * Copyright (c) 2013 Nicira, Inc.
- */
- #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
- #include <linux/types.h>
- #include <linux/kernel.h>
- #include <linux/skbuff.h>
- #include <linux/netdevice.h>
- #include <linux/in.h>
- #include <linux/if_arp.h>
- #include <linux/init.h>
- #include <linux/in6.h>
- #include <linux/inetdevice.h>
- #include <linux/netfilter_ipv4.h>
- #include <linux/etherdevice.h>
- #include <linux/if_ether.h>
- #include <linux/if_vlan.h>
- #include <linux/static_key.h>
- #include <net/ip.h>
- #include <net/icmp.h>
- #include <net/protocol.h>
- #include <net/ip_tunnels.h>
- #include <net/ip6_tunnel.h>
- #include <net/ip6_checksum.h>
- #include <net/arp.h>
- #include <net/checksum.h>
- #include <net/dsfield.h>
- #include <net/inet_ecn.h>
- #include <net/xfrm.h>
- #include <net/net_namespace.h>
- #include <net/netns/generic.h>
- #include <net/rtnetlink.h>
- #include <net/dst_metadata.h>
- #include <net/geneve.h>
- #include <net/vxlan.h>
- #include <net/erspan.h>
- const struct ip_tunnel_encap_ops __rcu *
- iptun_encaps[MAX_IPTUN_ENCAP_OPS] __read_mostly;
- EXPORT_SYMBOL(iptun_encaps);
- const struct ip6_tnl_encap_ops __rcu *
- ip6tun_encaps[MAX_IPTUN_ENCAP_OPS] __read_mostly;
- EXPORT_SYMBOL(ip6tun_encaps);
- void iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
- __be32 src, __be32 dst, __u8 proto,
- __u8 tos, __u8 ttl, __be16 df, bool xnet)
- {
- int pkt_len = skb->len - skb_inner_network_offset(skb);
- struct net *net = dev_net(rt->dst.dev);
- struct net_device *dev = skb->dev;
- struct iphdr *iph;
- int err;
- skb_scrub_packet(skb, xnet);
- skb_clear_hash_if_not_l4(skb);
- skb_dst_set(skb, &rt->dst);
- memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
- /* Push down and install the IP header. */
- skb_push(skb, sizeof(struct iphdr));
- skb_reset_network_header(skb);
- iph = ip_hdr(skb);
- iph->version = 4;
- iph->ihl = sizeof(struct iphdr) >> 2;
- iph->frag_off = ip_mtu_locked(&rt->dst) ? 0 : df;
- iph->protocol = proto;
- iph->tos = tos;
- iph->daddr = dst;
- iph->saddr = src;
- iph->ttl = ttl;
- __ip_select_ident(net, iph, skb_shinfo(skb)->gso_segs ?: 1);
- err = ip_local_out(net, sk, skb);
- if (dev) {
- if (unlikely(net_xmit_eval(err)))
- pkt_len = 0;
- iptunnel_xmit_stats(dev, pkt_len);
- }
- }
- EXPORT_SYMBOL_GPL(iptunnel_xmit);
- int __iptunnel_pull_header(struct sk_buff *skb, int hdr_len,
- __be16 inner_proto, bool raw_proto, bool xnet)
- {
- if (unlikely(!pskb_may_pull(skb, hdr_len)))
- return -ENOMEM;
- skb_pull_rcsum(skb, hdr_len);
- if (!raw_proto && inner_proto == htons(ETH_P_TEB)) {
- struct ethhdr *eh;
- if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
- return -ENOMEM;
- eh = (struct ethhdr *)skb->data;
- if (likely(eth_proto_is_802_3(eh->h_proto)))
- skb->protocol = eh->h_proto;
- else
- skb->protocol = htons(ETH_P_802_2);
- } else {
- skb->protocol = inner_proto;
- }
- skb_clear_hash_if_not_l4(skb);
- __vlan_hwaccel_clear_tag(skb);
- skb_set_queue_mapping(skb, 0);
- skb_scrub_packet(skb, xnet);
- return iptunnel_pull_offloads(skb);
- }
- EXPORT_SYMBOL_GPL(__iptunnel_pull_header);
- struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md,
- gfp_t flags)
- {
- struct metadata_dst *res;
- struct ip_tunnel_info *dst, *src;
- if (!md || md->type != METADATA_IP_TUNNEL ||
- md->u.tun_info.mode & IP_TUNNEL_INFO_TX)
- return NULL;
- src = &md->u.tun_info;
- res = metadata_dst_alloc(src->options_len, METADATA_IP_TUNNEL, flags);
- if (!res)
- return NULL;
- dst = &res->u.tun_info;
- dst->key.tun_id = src->key.tun_id;
- if (src->mode & IP_TUNNEL_INFO_IPV6)
- memcpy(&dst->key.u.ipv6.dst, &src->key.u.ipv6.src,
- sizeof(struct in6_addr));
- else
- dst->key.u.ipv4.dst = src->key.u.ipv4.src;
- dst->key.tun_flags = src->key.tun_flags;
- dst->mode = src->mode | IP_TUNNEL_INFO_TX;
- ip_tunnel_info_opts_set(dst, ip_tunnel_info_opts(src),
- src->options_len, 0);
- return res;
- }
- EXPORT_SYMBOL_GPL(iptunnel_metadata_reply);
- int iptunnel_handle_offloads(struct sk_buff *skb,
- int gso_type_mask)
- {
- int err;
- if (likely(!skb->encapsulation)) {
- skb_reset_inner_headers(skb);
- skb->encapsulation = 1;
- }
- if (skb_is_gso(skb)) {
- err = skb_header_unclone(skb, GFP_ATOMIC);
- if (unlikely(err))
- return err;
- skb_shinfo(skb)->gso_type |= gso_type_mask;
- return 0;
- }
- if (skb->ip_summed != CHECKSUM_PARTIAL) {
- skb->ip_summed = CHECKSUM_NONE;
- /* We clear encapsulation here to prevent badly-written
- * drivers potentially deciding to offload an inner checksum
- * if we set CHECKSUM_PARTIAL on the outer header.
- * This should go away when the drivers are all fixed.
- */
- skb->encapsulation = 0;
- }
- return 0;
- }
- EXPORT_SYMBOL_GPL(iptunnel_handle_offloads);
- /**
- * iptunnel_pmtud_build_icmp() - Build ICMP error message for PMTUD
- * @skb: Original packet with L2 header
- * @mtu: MTU value for ICMP error
- *
- * Return: length on success, negative error code if message couldn't be built.
- */
- static int iptunnel_pmtud_build_icmp(struct sk_buff *skb, int mtu)
- {
- const struct iphdr *iph = ip_hdr(skb);
- struct icmphdr *icmph;
- struct iphdr *niph;
- struct ethhdr eh;
- int len, err;
- if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct iphdr)))
- return -EINVAL;
- skb_copy_bits(skb, skb_mac_offset(skb), &eh, ETH_HLEN);
- pskb_pull(skb, ETH_HLEN);
- skb_reset_network_header(skb);
- err = pskb_trim(skb, 576 - sizeof(*niph) - sizeof(*icmph));
- if (err)
- return err;
- len = skb->len + sizeof(*icmph);
- err = skb_cow(skb, sizeof(*niph) + sizeof(*icmph) + ETH_HLEN);
- if (err)
- return err;
- icmph = skb_push(skb, sizeof(*icmph));
- *icmph = (struct icmphdr) {
- .type = ICMP_DEST_UNREACH,
- .code = ICMP_FRAG_NEEDED,
- .checksum = 0,
- .un.frag.__unused = 0,
- .un.frag.mtu = ntohs(mtu),
- };
- icmph->checksum = ip_compute_csum(icmph, len);
- skb_reset_transport_header(skb);
- niph = skb_push(skb, sizeof(*niph));
- *niph = (struct iphdr) {
- .ihl = sizeof(*niph) / 4u,
- .version = 4,
- .tos = 0,
- .tot_len = htons(len + sizeof(*niph)),
- .id = 0,
- .frag_off = htons(IP_DF),
- .ttl = iph->ttl,
- .protocol = IPPROTO_ICMP,
- .saddr = iph->daddr,
- .daddr = iph->saddr,
- };
- ip_send_check(niph);
- skb_reset_network_header(skb);
- skb->ip_summed = CHECKSUM_NONE;
- eth_header(skb, skb->dev, htons(eh.h_proto), eh.h_source, eh.h_dest, 0);
- skb_reset_mac_header(skb);
- return skb->len;
- }
- /**
- * iptunnel_pmtud_check_icmp() - Trigger ICMP reply if needed and allowed
- * @skb: Buffer being sent by encapsulation, L2 headers expected
- * @mtu: Network MTU for path
- *
- * Return: 0 for no ICMP reply, length if built, negative value on error.
- */
- static int iptunnel_pmtud_check_icmp(struct sk_buff *skb, int mtu)
- {
- const struct icmphdr *icmph = icmp_hdr(skb);
- const struct iphdr *iph = ip_hdr(skb);
- if (mtu < 576 || iph->frag_off != htons(IP_DF))
- return 0;
- if (ipv4_is_lbcast(iph->daddr) || ipv4_is_multicast(iph->daddr) ||
- ipv4_is_zeronet(iph->saddr) || ipv4_is_loopback(iph->saddr) ||
- ipv4_is_lbcast(iph->saddr) || ipv4_is_multicast(iph->saddr))
- return 0;
- if (iph->protocol == IPPROTO_ICMP && icmp_is_err(icmph->type))
- return 0;
- return iptunnel_pmtud_build_icmp(skb, mtu);
- }
- #if IS_ENABLED(CONFIG_IPV6)
- /**
- * iptunnel_pmtud_build_icmpv6() - Build ICMPv6 error message for PMTUD
- * @skb: Original packet with L2 header
- * @mtu: MTU value for ICMPv6 error
- *
- * Return: length on success, negative error code if message couldn't be built.
- */
- static int iptunnel_pmtud_build_icmpv6(struct sk_buff *skb, int mtu)
- {
- const struct ipv6hdr *ip6h = ipv6_hdr(skb);
- struct icmp6hdr *icmp6h;
- struct ipv6hdr *nip6h;
- struct ethhdr eh;
- int len, err;
- __wsum csum;
- if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct ipv6hdr)))
- return -EINVAL;
- skb_copy_bits(skb, skb_mac_offset(skb), &eh, ETH_HLEN);
- pskb_pull(skb, ETH_HLEN);
- skb_reset_network_header(skb);
- err = pskb_trim(skb, IPV6_MIN_MTU - sizeof(*nip6h) - sizeof(*icmp6h));
- if (err)
- return err;
- len = skb->len + sizeof(*icmp6h);
- err = skb_cow(skb, sizeof(*nip6h) + sizeof(*icmp6h) + ETH_HLEN);
- if (err)
- return err;
- icmp6h = skb_push(skb, sizeof(*icmp6h));
- *icmp6h = (struct icmp6hdr) {
- .icmp6_type = ICMPV6_PKT_TOOBIG,
- .icmp6_code = 0,
- .icmp6_cksum = 0,
- .icmp6_mtu = htonl(mtu),
- };
- skb_reset_transport_header(skb);
- nip6h = skb_push(skb, sizeof(*nip6h));
- *nip6h = (struct ipv6hdr) {
- .priority = 0,
- .version = 6,
- .flow_lbl = { 0 },
- .payload_len = htons(len),
- .nexthdr = IPPROTO_ICMPV6,
- .hop_limit = ip6h->hop_limit,
- .saddr = ip6h->daddr,
- .daddr = ip6h->saddr,
- };
- skb_reset_network_header(skb);
- csum = csum_partial(icmp6h, len, 0);
- icmp6h->icmp6_cksum = csum_ipv6_magic(&nip6h->saddr, &nip6h->daddr, len,
- IPPROTO_ICMPV6, csum);
- skb->ip_summed = CHECKSUM_NONE;
- eth_header(skb, skb->dev, htons(eh.h_proto), eh.h_source, eh.h_dest, 0);
- skb_reset_mac_header(skb);
- return skb->len;
- }
- /**
- * iptunnel_pmtud_check_icmpv6() - Trigger ICMPv6 reply if needed and allowed
- * @skb: Buffer being sent by encapsulation, L2 headers expected
- * @mtu: Network MTU for path
- *
- * Return: 0 for no ICMPv6 reply, length if built, negative value on error.
- */
- static int iptunnel_pmtud_check_icmpv6(struct sk_buff *skb, int mtu)
- {
- const struct ipv6hdr *ip6h = ipv6_hdr(skb);
- int stype = ipv6_addr_type(&ip6h->saddr);
- u8 proto = ip6h->nexthdr;
- __be16 frag_off;
- int offset;
- if (mtu < IPV6_MIN_MTU)
- return 0;
- if (stype == IPV6_ADDR_ANY || stype == IPV6_ADDR_MULTICAST ||
- stype == IPV6_ADDR_LOOPBACK)
- return 0;
- offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &proto,
- &frag_off);
- if (offset < 0 || (frag_off & htons(~0x7)))
- return 0;
- if (proto == IPPROTO_ICMPV6) {
- struct icmp6hdr *icmp6h;
- if (!pskb_may_pull(skb, skb_network_header(skb) +
- offset + 1 - skb->data))
- return 0;
- icmp6h = (struct icmp6hdr *)(skb_network_header(skb) + offset);
- if (icmpv6_is_err(icmp6h->icmp6_type) ||
- icmp6h->icmp6_type == NDISC_REDIRECT)
- return 0;
- }
- return iptunnel_pmtud_build_icmpv6(skb, mtu);
- }
- #endif /* IS_ENABLED(CONFIG_IPV6) */
- /**
- * skb_tunnel_check_pmtu() - Check, update PMTU and trigger ICMP reply as needed
- * @skb: Buffer being sent by encapsulation, L2 headers expected
- * @encap_dst: Destination for tunnel encapsulation (outer IP)
- * @headroom: Encapsulation header size, bytes
- * @reply: Build matching ICMP or ICMPv6 message as a result
- *
- * L2 tunnel implementations that can carry IP and can be directly bridged
- * (currently UDP tunnels) can't always rely on IP forwarding paths to handle
- * PMTU discovery. In the bridged case, ICMP or ICMPv6 messages need to be built
- * based on payload and sent back by the encapsulation itself.
- *
- * For routable interfaces, we just need to update the PMTU for the destination.
- *
- * Return: 0 if ICMP error not needed, length if built, negative value on error
- */
- int skb_tunnel_check_pmtu(struct sk_buff *skb, struct dst_entry *encap_dst,
- int headroom, bool reply)
- {
- u32 mtu = dst_mtu(encap_dst) - headroom;
- if ((skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu)) ||
- (!skb_is_gso(skb) && (skb->len - skb_mac_header_len(skb)) <= mtu))
- return 0;
- skb_dst_update_pmtu_no_confirm(skb, mtu);
- if (!reply || skb->pkt_type == PACKET_HOST)
- return 0;
- if (skb->protocol == htons(ETH_P_IP))
- return iptunnel_pmtud_check_icmp(skb, mtu);
- #if IS_ENABLED(CONFIG_IPV6)
- if (skb->protocol == htons(ETH_P_IPV6))
- return iptunnel_pmtud_check_icmpv6(skb, mtu);
- #endif
- return 0;
- }
- EXPORT_SYMBOL(skb_tunnel_check_pmtu);
- /* Often modified stats are per cpu, other are shared (netdev->stats) */
- void ip_tunnel_get_stats64(struct net_device *dev,
- struct rtnl_link_stats64 *tot)
- {
- netdev_stats_to_stats64(tot, &dev->stats);
- dev_fetch_sw_netstats(tot, dev->tstats);
- }
- EXPORT_SYMBOL_GPL(ip_tunnel_get_stats64);
- static const struct nla_policy ip_tun_policy[LWTUNNEL_IP_MAX + 1] = {
- [LWTUNNEL_IP_UNSPEC] = { .strict_start_type = LWTUNNEL_IP_OPTS },
- [LWTUNNEL_IP_ID] = { .type = NLA_U64 },
- [LWTUNNEL_IP_DST] = { .type = NLA_U32 },
- [LWTUNNEL_IP_SRC] = { .type = NLA_U32 },
- [LWTUNNEL_IP_TTL] = { .type = NLA_U8 },
- [LWTUNNEL_IP_TOS] = { .type = NLA_U8 },
- [LWTUNNEL_IP_FLAGS] = { .type = NLA_U16 },
- [LWTUNNEL_IP_OPTS] = { .type = NLA_NESTED },
- };
- static const struct nla_policy ip_opts_policy[LWTUNNEL_IP_OPTS_MAX + 1] = {
- [LWTUNNEL_IP_OPTS_GENEVE] = { .type = NLA_NESTED },
- [LWTUNNEL_IP_OPTS_VXLAN] = { .type = NLA_NESTED },
- [LWTUNNEL_IP_OPTS_ERSPAN] = { .type = NLA_NESTED },
- };
- static const struct nla_policy
- geneve_opt_policy[LWTUNNEL_IP_OPT_GENEVE_MAX + 1] = {
- [LWTUNNEL_IP_OPT_GENEVE_CLASS] = { .type = NLA_U16 },
- [LWTUNNEL_IP_OPT_GENEVE_TYPE] = { .type = NLA_U8 },
- [LWTUNNEL_IP_OPT_GENEVE_DATA] = { .type = NLA_BINARY, .len = 128 },
- };
- static const struct nla_policy
- vxlan_opt_policy[LWTUNNEL_IP_OPT_VXLAN_MAX + 1] = {
- [LWTUNNEL_IP_OPT_VXLAN_GBP] = { .type = NLA_U32 },
- };
- static const struct nla_policy
- erspan_opt_policy[LWTUNNEL_IP_OPT_ERSPAN_MAX + 1] = {
- [LWTUNNEL_IP_OPT_ERSPAN_VER] = { .type = NLA_U8 },
- [LWTUNNEL_IP_OPT_ERSPAN_INDEX] = { .type = NLA_U32 },
- [LWTUNNEL_IP_OPT_ERSPAN_DIR] = { .type = NLA_U8 },
- [LWTUNNEL_IP_OPT_ERSPAN_HWID] = { .type = NLA_U8 },
- };
- static int ip_tun_parse_opts_geneve(struct nlattr *attr,
- struct ip_tunnel_info *info, int opts_len,
- struct netlink_ext_ack *extack)
- {
- struct nlattr *tb[LWTUNNEL_IP_OPT_GENEVE_MAX + 1];
- int data_len, err;
- err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_GENEVE_MAX, attr,
- geneve_opt_policy, extack);
- if (err)
- return err;
- if (!tb[LWTUNNEL_IP_OPT_GENEVE_CLASS] ||
- !tb[LWTUNNEL_IP_OPT_GENEVE_TYPE] ||
- !tb[LWTUNNEL_IP_OPT_GENEVE_DATA])
- return -EINVAL;
- attr = tb[LWTUNNEL_IP_OPT_GENEVE_DATA];
- data_len = nla_len(attr);
- if (data_len % 4)
- return -EINVAL;
- if (info) {
- struct geneve_opt *opt = ip_tunnel_info_opts(info) + opts_len;
- memcpy(opt->opt_data, nla_data(attr), data_len);
- opt->length = data_len / 4;
- attr = tb[LWTUNNEL_IP_OPT_GENEVE_CLASS];
- opt->opt_class = nla_get_be16(attr);
- attr = tb[LWTUNNEL_IP_OPT_GENEVE_TYPE];
- opt->type = nla_get_u8(attr);
- info->key.tun_flags |= TUNNEL_GENEVE_OPT;
- }
- return sizeof(struct geneve_opt) + data_len;
- }
- static int ip_tun_parse_opts_vxlan(struct nlattr *attr,
- struct ip_tunnel_info *info, int opts_len,
- struct netlink_ext_ack *extack)
- {
- struct nlattr *tb[LWTUNNEL_IP_OPT_VXLAN_MAX + 1];
- int err;
- err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_VXLAN_MAX, attr,
- vxlan_opt_policy, extack);
- if (err)
- return err;
- if (!tb[LWTUNNEL_IP_OPT_VXLAN_GBP])
- return -EINVAL;
- if (info) {
- struct vxlan_metadata *md =
- ip_tunnel_info_opts(info) + opts_len;
- attr = tb[LWTUNNEL_IP_OPT_VXLAN_GBP];
- md->gbp = nla_get_u32(attr);
- md->gbp &= VXLAN_GBP_MASK;
- info->key.tun_flags |= TUNNEL_VXLAN_OPT;
- }
- return sizeof(struct vxlan_metadata);
- }
- static int ip_tun_parse_opts_erspan(struct nlattr *attr,
- struct ip_tunnel_info *info, int opts_len,
- struct netlink_ext_ack *extack)
- {
- struct nlattr *tb[LWTUNNEL_IP_OPT_ERSPAN_MAX + 1];
- int err;
- u8 ver;
- err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_ERSPAN_MAX, attr,
- erspan_opt_policy, extack);
- if (err)
- return err;
- if (!tb[LWTUNNEL_IP_OPT_ERSPAN_VER])
- return -EINVAL;
- ver = nla_get_u8(tb[LWTUNNEL_IP_OPT_ERSPAN_VER]);
- if (ver == 1) {
- if (!tb[LWTUNNEL_IP_OPT_ERSPAN_INDEX])
- return -EINVAL;
- } else if (ver == 2) {
- if (!tb[LWTUNNEL_IP_OPT_ERSPAN_DIR] ||
- !tb[LWTUNNEL_IP_OPT_ERSPAN_HWID])
- return -EINVAL;
- } else {
- return -EINVAL;
- }
- if (info) {
- struct erspan_metadata *md =
- ip_tunnel_info_opts(info) + opts_len;
- md->version = ver;
- if (ver == 1) {
- attr = tb[LWTUNNEL_IP_OPT_ERSPAN_INDEX];
- md->u.index = nla_get_be32(attr);
- } else {
- attr = tb[LWTUNNEL_IP_OPT_ERSPAN_DIR];
- md->u.md2.dir = nla_get_u8(attr);
- attr = tb[LWTUNNEL_IP_OPT_ERSPAN_HWID];
- set_hwid(&md->u.md2, nla_get_u8(attr));
- }
- info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
- }
- return sizeof(struct erspan_metadata);
- }
- static int ip_tun_parse_opts(struct nlattr *attr, struct ip_tunnel_info *info,
- struct netlink_ext_ack *extack)
- {
- int err, rem, opt_len, opts_len = 0, type = 0;
- struct nlattr *nla;
- if (!attr)
- return 0;
- err = nla_validate(nla_data(attr), nla_len(attr), LWTUNNEL_IP_OPTS_MAX,
- ip_opts_policy, extack);
- if (err)
- return err;
- nla_for_each_attr(nla, nla_data(attr), nla_len(attr), rem) {
- switch (nla_type(nla)) {
- case LWTUNNEL_IP_OPTS_GENEVE:
- if (type && type != TUNNEL_GENEVE_OPT)
- return -EINVAL;
- opt_len = ip_tun_parse_opts_geneve(nla, info, opts_len,
- extack);
- if (opt_len < 0)
- return opt_len;
- opts_len += opt_len;
- if (opts_len > IP_TUNNEL_OPTS_MAX)
- return -EINVAL;
- type = TUNNEL_GENEVE_OPT;
- break;
- case LWTUNNEL_IP_OPTS_VXLAN:
- if (type)
- return -EINVAL;
- opt_len = ip_tun_parse_opts_vxlan(nla, info, opts_len,
- extack);
- if (opt_len < 0)
- return opt_len;
- opts_len += opt_len;
- type = TUNNEL_VXLAN_OPT;
- break;
- case LWTUNNEL_IP_OPTS_ERSPAN:
- if (type)
- return -EINVAL;
- opt_len = ip_tun_parse_opts_erspan(nla, info, opts_len,
- extack);
- if (opt_len < 0)
- return opt_len;
- opts_len += opt_len;
- type = TUNNEL_ERSPAN_OPT;
- break;
- default:
- return -EINVAL;
- }
- }
- return opts_len;
- }
- static int ip_tun_get_optlen(struct nlattr *attr,
- struct netlink_ext_ack *extack)
- {
- return ip_tun_parse_opts(attr, NULL, extack);
- }
- static int ip_tun_set_opts(struct nlattr *attr, struct ip_tunnel_info *info,
- struct netlink_ext_ack *extack)
- {
- return ip_tun_parse_opts(attr, info, extack);
- }
- static int ip_tun_build_state(struct net *net, struct nlattr *attr,
- unsigned int family, const void *cfg,
- struct lwtunnel_state **ts,
- struct netlink_ext_ack *extack)
- {
- struct nlattr *tb[LWTUNNEL_IP_MAX + 1];
- struct lwtunnel_state *new_state;
- struct ip_tunnel_info *tun_info;
- int err, opt_len;
- err = nla_parse_nested_deprecated(tb, LWTUNNEL_IP_MAX, attr,
- ip_tun_policy, extack);
- if (err < 0)
- return err;
- opt_len = ip_tun_get_optlen(tb[LWTUNNEL_IP_OPTS], extack);
- if (opt_len < 0)
- return opt_len;
- new_state = lwtunnel_state_alloc(sizeof(*tun_info) + opt_len);
- if (!new_state)
- return -ENOMEM;
- new_state->type = LWTUNNEL_ENCAP_IP;
- tun_info = lwt_tun_info(new_state);
- err = ip_tun_set_opts(tb[LWTUNNEL_IP_OPTS], tun_info, extack);
- if (err < 0) {
- lwtstate_free(new_state);
- return err;
- }
- #ifdef CONFIG_DST_CACHE
- err = dst_cache_init(&tun_info->dst_cache, GFP_KERNEL);
- if (err) {
- lwtstate_free(new_state);
- return err;
- }
- #endif
- if (tb[LWTUNNEL_IP_ID])
- tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP_ID]);
- if (tb[LWTUNNEL_IP_DST])
- tun_info->key.u.ipv4.dst = nla_get_in_addr(tb[LWTUNNEL_IP_DST]);
- if (tb[LWTUNNEL_IP_SRC])
- tun_info->key.u.ipv4.src = nla_get_in_addr(tb[LWTUNNEL_IP_SRC]);
- if (tb[LWTUNNEL_IP_TTL])
- tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP_TTL]);
- if (tb[LWTUNNEL_IP_TOS])
- tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP_TOS]);
- if (tb[LWTUNNEL_IP_FLAGS])
- tun_info->key.tun_flags |=
- (nla_get_be16(tb[LWTUNNEL_IP_FLAGS]) &
- ~TUNNEL_OPTIONS_PRESENT);
- tun_info->mode = IP_TUNNEL_INFO_TX;
- tun_info->options_len = opt_len;
- *ts = new_state;
- return 0;
- }
- static void ip_tun_destroy_state(struct lwtunnel_state *lwtstate)
- {
- #ifdef CONFIG_DST_CACHE
- struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
- dst_cache_destroy(&tun_info->dst_cache);
- #endif
- }
- static int ip_tun_fill_encap_opts_geneve(struct sk_buff *skb,
- struct ip_tunnel_info *tun_info)
- {
- struct geneve_opt *opt;
- struct nlattr *nest;
- int offset = 0;
- nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_GENEVE);
- if (!nest)
- return -ENOMEM;
- while (tun_info->options_len > offset) {
- opt = ip_tunnel_info_opts(tun_info) + offset;
- if (nla_put_be16(skb, LWTUNNEL_IP_OPT_GENEVE_CLASS,
- opt->opt_class) ||
- nla_put_u8(skb, LWTUNNEL_IP_OPT_GENEVE_TYPE, opt->type) ||
- nla_put(skb, LWTUNNEL_IP_OPT_GENEVE_DATA, opt->length * 4,
- opt->opt_data)) {
- nla_nest_cancel(skb, nest);
- return -ENOMEM;
- }
- offset += sizeof(*opt) + opt->length * 4;
- }
- nla_nest_end(skb, nest);
- return 0;
- }
- static int ip_tun_fill_encap_opts_vxlan(struct sk_buff *skb,
- struct ip_tunnel_info *tun_info)
- {
- struct vxlan_metadata *md;
- struct nlattr *nest;
- nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_VXLAN);
- if (!nest)
- return -ENOMEM;
- md = ip_tunnel_info_opts(tun_info);
- if (nla_put_u32(skb, LWTUNNEL_IP_OPT_VXLAN_GBP, md->gbp)) {
- nla_nest_cancel(skb, nest);
- return -ENOMEM;
- }
- nla_nest_end(skb, nest);
- return 0;
- }
- static int ip_tun_fill_encap_opts_erspan(struct sk_buff *skb,
- struct ip_tunnel_info *tun_info)
- {
- struct erspan_metadata *md;
- struct nlattr *nest;
- nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_ERSPAN);
- if (!nest)
- return -ENOMEM;
- md = ip_tunnel_info_opts(tun_info);
- if (nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_VER, md->version))
- goto err;
- if (md->version == 1 &&
- nla_put_be32(skb, LWTUNNEL_IP_OPT_ERSPAN_INDEX, md->u.index))
- goto err;
- if (md->version == 2 &&
- (nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_DIR, md->u.md2.dir) ||
- nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_HWID,
- get_hwid(&md->u.md2))))
- goto err;
- nla_nest_end(skb, nest);
- return 0;
- err:
- nla_nest_cancel(skb, nest);
- return -ENOMEM;
- }
- static int ip_tun_fill_encap_opts(struct sk_buff *skb, int type,
- struct ip_tunnel_info *tun_info)
- {
- struct nlattr *nest;
- int err = 0;
- if (!(tun_info->key.tun_flags & TUNNEL_OPTIONS_PRESENT))
- return 0;
- nest = nla_nest_start_noflag(skb, type);
- if (!nest)
- return -ENOMEM;
- if (tun_info->key.tun_flags & TUNNEL_GENEVE_OPT)
- err = ip_tun_fill_encap_opts_geneve(skb, tun_info);
- else if (tun_info->key.tun_flags & TUNNEL_VXLAN_OPT)
- err = ip_tun_fill_encap_opts_vxlan(skb, tun_info);
- else if (tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT)
- err = ip_tun_fill_encap_opts_erspan(skb, tun_info);
- if (err) {
- nla_nest_cancel(skb, nest);
- return err;
- }
- nla_nest_end(skb, nest);
- return 0;
- }
- static int ip_tun_fill_encap_info(struct sk_buff *skb,
- struct lwtunnel_state *lwtstate)
- {
- struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
- if (nla_put_be64(skb, LWTUNNEL_IP_ID, tun_info->key.tun_id,
- LWTUNNEL_IP_PAD) ||
- nla_put_in_addr(skb, LWTUNNEL_IP_DST, tun_info->key.u.ipv4.dst) ||
- nla_put_in_addr(skb, LWTUNNEL_IP_SRC, tun_info->key.u.ipv4.src) ||
- nla_put_u8(skb, LWTUNNEL_IP_TOS, tun_info->key.tos) ||
- nla_put_u8(skb, LWTUNNEL_IP_TTL, tun_info->key.ttl) ||
- nla_put_be16(skb, LWTUNNEL_IP_FLAGS, tun_info->key.tun_flags) ||
- ip_tun_fill_encap_opts(skb, LWTUNNEL_IP_OPTS, tun_info))
- return -ENOMEM;
- return 0;
- }
- static int ip_tun_opts_nlsize(struct ip_tunnel_info *info)
- {
- int opt_len;
- if (!(info->key.tun_flags & TUNNEL_OPTIONS_PRESENT))
- return 0;
- opt_len = nla_total_size(0); /* LWTUNNEL_IP_OPTS */
- if (info->key.tun_flags & TUNNEL_GENEVE_OPT) {
- struct geneve_opt *opt;
- int offset = 0;
- opt_len += nla_total_size(0); /* LWTUNNEL_IP_OPTS_GENEVE */
- while (info->options_len > offset) {
- opt = ip_tunnel_info_opts(info) + offset;
- opt_len += nla_total_size(2) /* OPT_GENEVE_CLASS */
- + nla_total_size(1) /* OPT_GENEVE_TYPE */
- + nla_total_size(opt->length * 4);
- /* OPT_GENEVE_DATA */
- offset += sizeof(*opt) + opt->length * 4;
- }
- } else if (info->key.tun_flags & TUNNEL_VXLAN_OPT) {
- opt_len += nla_total_size(0) /* LWTUNNEL_IP_OPTS_VXLAN */
- + nla_total_size(4); /* OPT_VXLAN_GBP */
- } else if (info->key.tun_flags & TUNNEL_ERSPAN_OPT) {
- struct erspan_metadata *md = ip_tunnel_info_opts(info);
- opt_len += nla_total_size(0) /* LWTUNNEL_IP_OPTS_ERSPAN */
- + nla_total_size(1) /* OPT_ERSPAN_VER */
- + (md->version == 1 ? nla_total_size(4)
- /* OPT_ERSPAN_INDEX (v1) */
- : nla_total_size(1) +
- nla_total_size(1));
- /* OPT_ERSPAN_DIR + HWID (v2) */
- }
- return opt_len;
- }
- static int ip_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
- {
- return nla_total_size_64bit(8) /* LWTUNNEL_IP_ID */
- + nla_total_size(4) /* LWTUNNEL_IP_DST */
- + nla_total_size(4) /* LWTUNNEL_IP_SRC */
- + nla_total_size(1) /* LWTUNNEL_IP_TOS */
- + nla_total_size(1) /* LWTUNNEL_IP_TTL */
- + nla_total_size(2) /* LWTUNNEL_IP_FLAGS */
- + ip_tun_opts_nlsize(lwt_tun_info(lwtstate));
- /* LWTUNNEL_IP_OPTS */
- }
- static int ip_tun_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b)
- {
- struct ip_tunnel_info *info_a = lwt_tun_info(a);
- struct ip_tunnel_info *info_b = lwt_tun_info(b);
- return memcmp(info_a, info_b, sizeof(info_a->key)) ||
- info_a->mode != info_b->mode ||
- info_a->options_len != info_b->options_len ||
- memcmp(ip_tunnel_info_opts(info_a),
- ip_tunnel_info_opts(info_b), info_a->options_len);
- }
- static const struct lwtunnel_encap_ops ip_tun_lwt_ops = {
- .build_state = ip_tun_build_state,
- .destroy_state = ip_tun_destroy_state,
- .fill_encap = ip_tun_fill_encap_info,
- .get_encap_size = ip_tun_encap_nlsize,
- .cmp_encap = ip_tun_cmp_encap,
- .owner = THIS_MODULE,
- };
- static const struct nla_policy ip6_tun_policy[LWTUNNEL_IP6_MAX + 1] = {
- [LWTUNNEL_IP6_UNSPEC] = { .strict_start_type = LWTUNNEL_IP6_OPTS },
- [LWTUNNEL_IP6_ID] = { .type = NLA_U64 },
- [LWTUNNEL_IP6_DST] = { .len = sizeof(struct in6_addr) },
- [LWTUNNEL_IP6_SRC] = { .len = sizeof(struct in6_addr) },
- [LWTUNNEL_IP6_HOPLIMIT] = { .type = NLA_U8 },
- [LWTUNNEL_IP6_TC] = { .type = NLA_U8 },
- [LWTUNNEL_IP6_FLAGS] = { .type = NLA_U16 },
- [LWTUNNEL_IP6_OPTS] = { .type = NLA_NESTED },
- };
- static int ip6_tun_build_state(struct net *net, struct nlattr *attr,
- unsigned int family, const void *cfg,
- struct lwtunnel_state **ts,
- struct netlink_ext_ack *extack)
- {
- struct nlattr *tb[LWTUNNEL_IP6_MAX + 1];
- struct lwtunnel_state *new_state;
- struct ip_tunnel_info *tun_info;
- int err, opt_len;
- err = nla_parse_nested_deprecated(tb, LWTUNNEL_IP6_MAX, attr,
- ip6_tun_policy, extack);
- if (err < 0)
- return err;
- opt_len = ip_tun_get_optlen(tb[LWTUNNEL_IP6_OPTS], extack);
- if (opt_len < 0)
- return opt_len;
- new_state = lwtunnel_state_alloc(sizeof(*tun_info) + opt_len);
- if (!new_state)
- return -ENOMEM;
- new_state->type = LWTUNNEL_ENCAP_IP6;
- tun_info = lwt_tun_info(new_state);
- err = ip_tun_set_opts(tb[LWTUNNEL_IP6_OPTS], tun_info, extack);
- if (err < 0) {
- lwtstate_free(new_state);
- return err;
- }
- if (tb[LWTUNNEL_IP6_ID])
- tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP6_ID]);
- if (tb[LWTUNNEL_IP6_DST])
- tun_info->key.u.ipv6.dst = nla_get_in6_addr(tb[LWTUNNEL_IP6_DST]);
- if (tb[LWTUNNEL_IP6_SRC])
- tun_info->key.u.ipv6.src = nla_get_in6_addr(tb[LWTUNNEL_IP6_SRC]);
- if (tb[LWTUNNEL_IP6_HOPLIMIT])
- tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP6_HOPLIMIT]);
- if (tb[LWTUNNEL_IP6_TC])
- tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP6_TC]);
- if (tb[LWTUNNEL_IP6_FLAGS])
- tun_info->key.tun_flags |=
- (nla_get_be16(tb[LWTUNNEL_IP6_FLAGS]) &
- ~TUNNEL_OPTIONS_PRESENT);
- tun_info->mode = IP_TUNNEL_INFO_TX | IP_TUNNEL_INFO_IPV6;
- tun_info->options_len = opt_len;
- *ts = new_state;
- return 0;
- }
- static int ip6_tun_fill_encap_info(struct sk_buff *skb,
- struct lwtunnel_state *lwtstate)
- {
- struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
- if (nla_put_be64(skb, LWTUNNEL_IP6_ID, tun_info->key.tun_id,
- LWTUNNEL_IP6_PAD) ||
- nla_put_in6_addr(skb, LWTUNNEL_IP6_DST, &tun_info->key.u.ipv6.dst) ||
- nla_put_in6_addr(skb, LWTUNNEL_IP6_SRC, &tun_info->key.u.ipv6.src) ||
- nla_put_u8(skb, LWTUNNEL_IP6_TC, tun_info->key.tos) ||
- nla_put_u8(skb, LWTUNNEL_IP6_HOPLIMIT, tun_info->key.ttl) ||
- nla_put_be16(skb, LWTUNNEL_IP6_FLAGS, tun_info->key.tun_flags) ||
- ip_tun_fill_encap_opts(skb, LWTUNNEL_IP6_OPTS, tun_info))
- return -ENOMEM;
- return 0;
- }
- static int ip6_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
- {
- return nla_total_size_64bit(8) /* LWTUNNEL_IP6_ID */
- + nla_total_size(16) /* LWTUNNEL_IP6_DST */
- + nla_total_size(16) /* LWTUNNEL_IP6_SRC */
- + nla_total_size(1) /* LWTUNNEL_IP6_HOPLIMIT */
- + nla_total_size(1) /* LWTUNNEL_IP6_TC */
- + nla_total_size(2) /* LWTUNNEL_IP6_FLAGS */
- + ip_tun_opts_nlsize(lwt_tun_info(lwtstate));
- /* LWTUNNEL_IP6_OPTS */
- }
- static const struct lwtunnel_encap_ops ip6_tun_lwt_ops = {
- .build_state = ip6_tun_build_state,
- .fill_encap = ip6_tun_fill_encap_info,
- .get_encap_size = ip6_tun_encap_nlsize,
- .cmp_encap = ip_tun_cmp_encap,
- .owner = THIS_MODULE,
- };
- void __init ip_tunnel_core_init(void)
- {
- /* If you land here, make sure whether increasing ip_tunnel_info's
- * options_len is a reasonable choice with its usage in front ends
- * (f.e., it's part of flow keys, etc).
- */
- BUILD_BUG_ON(IP_TUNNEL_OPTS_MAX != 255);
- lwtunnel_encap_add_ops(&ip_tun_lwt_ops, LWTUNNEL_ENCAP_IP);
- lwtunnel_encap_add_ops(&ip6_tun_lwt_ops, LWTUNNEL_ENCAP_IP6);
- }
- DEFINE_STATIC_KEY_FALSE(ip_tunnel_metadata_cnt);
- EXPORT_SYMBOL(ip_tunnel_metadata_cnt);
- void ip_tunnel_need_metadata(void)
- {
- static_branch_inc(&ip_tunnel_metadata_cnt);
- }
- EXPORT_SYMBOL_GPL(ip_tunnel_need_metadata);
- void ip_tunnel_unneed_metadata(void)
- {
- static_branch_dec(&ip_tunnel_metadata_cnt);
- }
- EXPORT_SYMBOL_GPL(ip_tunnel_unneed_metadata);
- /* Returns either the correct skb->protocol value, or 0 if invalid. */
- __be16 ip_tunnel_parse_protocol(const struct sk_buff *skb)
- {
- if (skb_network_header(skb) >= skb->head &&
- (skb_network_header(skb) + sizeof(struct iphdr)) <= skb_tail_pointer(skb) &&
- ip_hdr(skb)->version == 4)
- return htons(ETH_P_IP);
- if (skb_network_header(skb) >= skb->head &&
- (skb_network_header(skb) + sizeof(struct ipv6hdr)) <= skb_tail_pointer(skb) &&
- ipv6_hdr(skb)->version == 6)
- return htons(ETH_P_IPV6);
- return 0;
- }
- EXPORT_SYMBOL(ip_tunnel_parse_protocol);
- const struct header_ops ip_tunnel_header_ops = { .parse_protocol = ip_tunnel_parse_protocol };
- EXPORT_SYMBOL(ip_tunnel_header_ops);
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