diff options
Diffstat (limited to 'net/ipv4/ip_tunnel_core.c')
-rw-r--r-- | net/ipv4/ip_tunnel_core.c | 1148 |
1 files changed, 1148 insertions, 0 deletions
diff --git a/net/ipv4/ip_tunnel_core.c b/net/ipv4/ip_tunnel_core.c new file mode 100644 index 0000000000..586b1b3e35 --- /dev/null +++ b/net/ipv4/ip_tunnel_core.c @@ -0,0 +1,1148 @@ +// 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 = htons(mtu), + }; + icmph->checksum = csum_fold(skb_checksum(skb, 0, len, 0)); + 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, ntohs(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, ntohs(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_network_offset(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); + +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; + struct nlattr *nla; + __be16 type = 0; + + 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); + +/* This function returns true when ENCAP attributes are present in the nl msg */ +bool ip_tunnel_netlink_encap_parms(struct nlattr *data[], + struct ip_tunnel_encap *encap) +{ + bool ret = false; + + memset(encap, 0, sizeof(*encap)); + + if (!data) + return ret; + + if (data[IFLA_IPTUN_ENCAP_TYPE]) { + ret = true; + encap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); + } + + if (data[IFLA_IPTUN_ENCAP_FLAGS]) { + ret = true; + encap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); + } + + if (data[IFLA_IPTUN_ENCAP_SPORT]) { + ret = true; + encap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]); + } + + if (data[IFLA_IPTUN_ENCAP_DPORT]) { + ret = true; + encap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]); + } + + return ret; +} +EXPORT_SYMBOL_GPL(ip_tunnel_netlink_encap_parms); + +void ip_tunnel_netlink_parms(struct nlattr *data[], + struct ip_tunnel_parm *parms) +{ + if (data[IFLA_IPTUN_LINK]) + parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); + + if (data[IFLA_IPTUN_LOCAL]) + parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]); + + if (data[IFLA_IPTUN_REMOTE]) + parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]); + + if (data[IFLA_IPTUN_TTL]) { + parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]); + if (parms->iph.ttl) + parms->iph.frag_off = htons(IP_DF); + } + + if (data[IFLA_IPTUN_TOS]) + parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]); + + if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC])) + parms->iph.frag_off = htons(IP_DF); + + if (data[IFLA_IPTUN_FLAGS]) + parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]); + + if (data[IFLA_IPTUN_PROTO]) + parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]); +} +EXPORT_SYMBOL_GPL(ip_tunnel_netlink_parms); |