// 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/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); /* 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) { int i; netdev_stats_to_stats64(tot, &dev->stats); for_each_possible_cpu(i) { const struct pcpu_sw_netstats *tstats = per_cpu_ptr(dev->tstats, i); u64 rx_packets, rx_bytes, tx_packets, tx_bytes; unsigned int start; do { start = u64_stats_fetch_begin_irq(&tstats->syncp); rx_packets = tstats->rx_packets; tx_packets = tstats->tx_packets; rx_bytes = tstats->rx_bytes; tx_bytes = tstats->tx_bytes; } while (u64_stats_fetch_retry_irq(&tstats->syncp, start)); tot->rx_packets += rx_packets; tot->tx_packets += tx_packets; tot->rx_bytes += rx_bytes; tot->tx_bytes += tx_bytes; } } 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); 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);