diff options
Diffstat (limited to 'net/ipv6/seg6_local.c')
| -rw-r--r-- | net/ipv6/seg6_local.c | 2310 |
1 files changed, 2310 insertions, 0 deletions
diff --git a/net/ipv6/seg6_local.c b/net/ipv6/seg6_local.c new file mode 100644 index 000000000..8370726ae --- /dev/null +++ b/net/ipv6/seg6_local.c @@ -0,0 +1,2310 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * SR-IPv6 implementation + * + * Authors: + * David Lebrun <david.lebrun@uclouvain.be> + * eBPF support: Mathieu Xhonneux <m.xhonneux@gmail.com> + */ + +#include <linux/filter.h> +#include <linux/types.h> +#include <linux/skbuff.h> +#include <linux/net.h> +#include <linux/module.h> +#include <net/ip.h> +#include <net/lwtunnel.h> +#include <net/netevent.h> +#include <net/netns/generic.h> +#include <net/ip6_fib.h> +#include <net/route.h> +#include <net/seg6.h> +#include <linux/seg6.h> +#include <linux/seg6_local.h> +#include <net/addrconf.h> +#include <net/ip6_route.h> +#include <net/dst_cache.h> +#include <net/ip_tunnels.h> +#ifdef CONFIG_IPV6_SEG6_HMAC +#include <net/seg6_hmac.h> +#endif +#include <net/seg6_local.h> +#include <linux/etherdevice.h> +#include <linux/bpf.h> +#include <linux/netfilter.h> + +#define SEG6_F_ATTR(i) BIT(i) + +struct seg6_local_lwt; + +/* callbacks used for customizing the creation and destruction of a behavior */ +struct seg6_local_lwtunnel_ops { + int (*build_state)(struct seg6_local_lwt *slwt, const void *cfg, + struct netlink_ext_ack *extack); + void (*destroy_state)(struct seg6_local_lwt *slwt); +}; + +struct seg6_action_desc { + int action; + unsigned long attrs; + + /* The optattrs field is used for specifying all the optional + * attributes supported by a specific behavior. + * It means that if one of these attributes is not provided in the + * netlink message during the behavior creation, no errors will be + * returned to the userspace. + * + * Each attribute can be only of two types (mutually exclusive): + * 1) required or 2) optional. + * Every user MUST obey to this rule! If you set an attribute as + * required the same attribute CANNOT be set as optional and vice + * versa. + */ + unsigned long optattrs; + + int (*input)(struct sk_buff *skb, struct seg6_local_lwt *slwt); + int static_headroom; + + struct seg6_local_lwtunnel_ops slwt_ops; +}; + +struct bpf_lwt_prog { + struct bpf_prog *prog; + char *name; +}; + +/* default length values (expressed in bits) for both Locator-Block and + * Locator-Node Function. + * + * Both SEG6_LOCAL_LCBLOCK_DBITS and SEG6_LOCAL_LCNODE_FN_DBITS *must* be: + * i) greater than 0; + * ii) evenly divisible by 8. In other terms, the lengths of the + * Locator-Block and Locator-Node Function must be byte-aligned (we can + * relax this constraint in the future if really needed). + * + * Moreover, a third condition must hold: + * iii) SEG6_LOCAL_LCBLOCK_DBITS + SEG6_LOCAL_LCNODE_FN_DBITS <= 128. + * + * The correctness of SEG6_LOCAL_LCBLOCK_DBITS and SEG6_LOCAL_LCNODE_FN_DBITS + * values are checked during the kernel compilation. If the compilation stops, + * check the value of these parameters to see if they meet conditions (i), (ii) + * and (iii). + */ +#define SEG6_LOCAL_LCBLOCK_DBITS 32 +#define SEG6_LOCAL_LCNODE_FN_DBITS 16 + +/* The following next_csid_chk_{cntr,lcblock,lcblock_fn}_bits macros can be + * used directly to check whether the lengths (in bits) of Locator-Block and + * Locator-Node Function are valid according to (i), (ii), (iii). + */ +#define next_csid_chk_cntr_bits(blen, flen) \ + ((blen) + (flen) > 128) + +#define next_csid_chk_lcblock_bits(blen) \ +({ \ + typeof(blen) __tmp = blen; \ + (!__tmp || __tmp > 120 || (__tmp & 0x07)); \ +}) + +#define next_csid_chk_lcnode_fn_bits(flen) \ + next_csid_chk_lcblock_bits(flen) + +/* Supported Flavor operations are reported in this bitmask */ +#define SEG6_LOCAL_FLV_SUPP_OPS (BIT(SEG6_LOCAL_FLV_OP_NEXT_CSID)) + +struct seg6_flavors_info { + /* Flavor operations */ + __u32 flv_ops; + + /* Locator-Block length, expressed in bits */ + __u8 lcblock_bits; + /* Locator-Node Function length, expressed in bits*/ + __u8 lcnode_func_bits; +}; + +enum seg6_end_dt_mode { + DT_INVALID_MODE = -EINVAL, + DT_LEGACY_MODE = 0, + DT_VRF_MODE = 1, +}; + +struct seg6_end_dt_info { + enum seg6_end_dt_mode mode; + + struct net *net; + /* VRF device associated to the routing table used by the SRv6 + * End.DT4/DT6 behavior for routing IPv4/IPv6 packets. + */ + int vrf_ifindex; + int vrf_table; + + /* tunneled packet family (IPv4 or IPv6). + * Protocol and header length are inferred from family. + */ + u16 family; +}; + +struct pcpu_seg6_local_counters { + u64_stats_t packets; + u64_stats_t bytes; + u64_stats_t errors; + + struct u64_stats_sync syncp; +}; + +/* This struct groups all the SRv6 Behavior counters supported so far. + * + * put_nla_counters() makes use of this data structure to collect all counter + * values after the per-CPU counter evaluation has been performed. + * Finally, each counter value (in seg6_local_counters) is stored in the + * corresponding netlink attribute and sent to user space. + * + * NB: we don't want to expose this structure to user space! + */ +struct seg6_local_counters { + __u64 packets; + __u64 bytes; + __u64 errors; +}; + +#define seg6_local_alloc_pcpu_counters(__gfp) \ + __netdev_alloc_pcpu_stats(struct pcpu_seg6_local_counters, \ + ((__gfp) | __GFP_ZERO)) + +#define SEG6_F_LOCAL_COUNTERS SEG6_F_ATTR(SEG6_LOCAL_COUNTERS) + +struct seg6_local_lwt { + int action; + struct ipv6_sr_hdr *srh; + int table; + struct in_addr nh4; + struct in6_addr nh6; + int iif; + int oif; + struct bpf_lwt_prog bpf; +#ifdef CONFIG_NET_L3_MASTER_DEV + struct seg6_end_dt_info dt_info; +#endif + struct seg6_flavors_info flv_info; + + struct pcpu_seg6_local_counters __percpu *pcpu_counters; + + int headroom; + struct seg6_action_desc *desc; + /* unlike the required attrs, we have to track the optional attributes + * that have been effectively parsed. + */ + unsigned long parsed_optattrs; +}; + +static struct seg6_local_lwt *seg6_local_lwtunnel(struct lwtunnel_state *lwt) +{ + return (struct seg6_local_lwt *)lwt->data; +} + +static struct ipv6_sr_hdr *get_and_validate_srh(struct sk_buff *skb) +{ + struct ipv6_sr_hdr *srh; + + srh = seg6_get_srh(skb, IP6_FH_F_SKIP_RH); + if (!srh) + return NULL; + +#ifdef CONFIG_IPV6_SEG6_HMAC + if (!seg6_hmac_validate_skb(skb)) + return NULL; +#endif + + return srh; +} + +static bool decap_and_validate(struct sk_buff *skb, int proto) +{ + struct ipv6_sr_hdr *srh; + unsigned int off = 0; + + srh = seg6_get_srh(skb, 0); + if (srh && srh->segments_left > 0) + return false; + +#ifdef CONFIG_IPV6_SEG6_HMAC + if (srh && !seg6_hmac_validate_skb(skb)) + return false; +#endif + + if (ipv6_find_hdr(skb, &off, proto, NULL, NULL) < 0) + return false; + + if (!pskb_pull(skb, off)) + return false; + + skb_postpull_rcsum(skb, skb_network_header(skb), off); + + skb_reset_network_header(skb); + skb_reset_transport_header(skb); + if (iptunnel_pull_offloads(skb)) + return false; + + return true; +} + +static void advance_nextseg(struct ipv6_sr_hdr *srh, struct in6_addr *daddr) +{ + struct in6_addr *addr; + + srh->segments_left--; + addr = srh->segments + srh->segments_left; + *daddr = *addr; +} + +static int +seg6_lookup_any_nexthop(struct sk_buff *skb, struct in6_addr *nhaddr, + u32 tbl_id, bool local_delivery) +{ + struct net *net = dev_net(skb->dev); + struct ipv6hdr *hdr = ipv6_hdr(skb); + int flags = RT6_LOOKUP_F_HAS_SADDR; + struct dst_entry *dst = NULL; + struct rt6_info *rt; + struct flowi6 fl6; + int dev_flags = 0; + + memset(&fl6, 0, sizeof(fl6)); + fl6.flowi6_iif = skb->dev->ifindex; + fl6.daddr = nhaddr ? *nhaddr : hdr->daddr; + fl6.saddr = hdr->saddr; + fl6.flowlabel = ip6_flowinfo(hdr); + fl6.flowi6_mark = skb->mark; + fl6.flowi6_proto = hdr->nexthdr; + + if (nhaddr) + fl6.flowi6_flags = FLOWI_FLAG_KNOWN_NH; + + if (!tbl_id) { + dst = ip6_route_input_lookup(net, skb->dev, &fl6, skb, flags); + } else { + struct fib6_table *table; + + table = fib6_get_table(net, tbl_id); + if (!table) + goto out; + + rt = ip6_pol_route(net, table, 0, &fl6, skb, flags); + dst = &rt->dst; + } + + /* we want to discard traffic destined for local packet processing, + * if @local_delivery is set to false. + */ + if (!local_delivery) + dev_flags |= IFF_LOOPBACK; + + if (dst && (dst->dev->flags & dev_flags) && !dst->error) { + dst_release(dst); + dst = NULL; + } + +out: + if (!dst) { + rt = net->ipv6.ip6_blk_hole_entry; + dst = &rt->dst; + dst_hold(dst); + } + + skb_dst_drop(skb); + skb_dst_set(skb, dst); + return dst->error; +} + +int seg6_lookup_nexthop(struct sk_buff *skb, + struct in6_addr *nhaddr, u32 tbl_id) +{ + return seg6_lookup_any_nexthop(skb, nhaddr, tbl_id, false); +} + +static __u8 seg6_flv_lcblock_octects(const struct seg6_flavors_info *finfo) +{ + return finfo->lcblock_bits >> 3; +} + +static __u8 seg6_flv_lcnode_func_octects(const struct seg6_flavors_info *finfo) +{ + return finfo->lcnode_func_bits >> 3; +} + +static bool seg6_next_csid_is_arg_zero(const struct in6_addr *addr, + const struct seg6_flavors_info *finfo) +{ + __u8 fnc_octects = seg6_flv_lcnode_func_octects(finfo); + __u8 blk_octects = seg6_flv_lcblock_octects(finfo); + __u8 arg_octects; + int i; + + arg_octects = 16 - blk_octects - fnc_octects; + for (i = 0; i < arg_octects; ++i) { + if (addr->s6_addr[blk_octects + fnc_octects + i] != 0x00) + return false; + } + + return true; +} + +/* assume that DA.Argument length > 0 */ +static void seg6_next_csid_advance_arg(struct in6_addr *addr, + const struct seg6_flavors_info *finfo) +{ + __u8 fnc_octects = seg6_flv_lcnode_func_octects(finfo); + __u8 blk_octects = seg6_flv_lcblock_octects(finfo); + + /* advance DA.Argument */ + memmove(&addr->s6_addr[blk_octects], + &addr->s6_addr[blk_octects + fnc_octects], + 16 - blk_octects - fnc_octects); + + memset(&addr->s6_addr[16 - fnc_octects], 0x00, fnc_octects); +} + +static int input_action_end_core(struct sk_buff *skb, + struct seg6_local_lwt *slwt) +{ + struct ipv6_sr_hdr *srh; + + srh = get_and_validate_srh(skb); + if (!srh) + goto drop; + + advance_nextseg(srh, &ipv6_hdr(skb)->daddr); + + seg6_lookup_nexthop(skb, NULL, 0); + + return dst_input(skb); + +drop: + kfree_skb(skb); + return -EINVAL; +} + +static int end_next_csid_core(struct sk_buff *skb, struct seg6_local_lwt *slwt) +{ + const struct seg6_flavors_info *finfo = &slwt->flv_info; + struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; + + if (seg6_next_csid_is_arg_zero(daddr, finfo)) + return input_action_end_core(skb, slwt); + + /* update DA */ + seg6_next_csid_advance_arg(daddr, finfo); + + seg6_lookup_nexthop(skb, NULL, 0); + + return dst_input(skb); +} + +static bool seg6_next_csid_enabled(__u32 fops) +{ + return fops & BIT(SEG6_LOCAL_FLV_OP_NEXT_CSID); +} + +/* regular endpoint function */ +static int input_action_end(struct sk_buff *skb, struct seg6_local_lwt *slwt) +{ + const struct seg6_flavors_info *finfo = &slwt->flv_info; + + if (seg6_next_csid_enabled(finfo->flv_ops)) + return end_next_csid_core(skb, slwt); + + return input_action_end_core(skb, slwt); +} + +/* regular endpoint, and forward to specified nexthop */ +static int input_action_end_x(struct sk_buff *skb, struct seg6_local_lwt *slwt) +{ + struct ipv6_sr_hdr *srh; + + srh = get_and_validate_srh(skb); + if (!srh) + goto drop; + + advance_nextseg(srh, &ipv6_hdr(skb)->daddr); + + seg6_lookup_nexthop(skb, &slwt->nh6, 0); + + return dst_input(skb); + +drop: + kfree_skb(skb); + return -EINVAL; +} + +static int input_action_end_t(struct sk_buff *skb, struct seg6_local_lwt *slwt) +{ + struct ipv6_sr_hdr *srh; + + srh = get_and_validate_srh(skb); + if (!srh) + goto drop; + + advance_nextseg(srh, &ipv6_hdr(skb)->daddr); + + seg6_lookup_nexthop(skb, NULL, slwt->table); + + return dst_input(skb); + +drop: + kfree_skb(skb); + return -EINVAL; +} + +/* decapsulate and forward inner L2 frame on specified interface */ +static int input_action_end_dx2(struct sk_buff *skb, + struct seg6_local_lwt *slwt) +{ + struct net *net = dev_net(skb->dev); + struct net_device *odev; + struct ethhdr *eth; + + if (!decap_and_validate(skb, IPPROTO_ETHERNET)) + goto drop; + + if (!pskb_may_pull(skb, ETH_HLEN)) + goto drop; + + skb_reset_mac_header(skb); + eth = (struct ethhdr *)skb->data; + + /* To determine the frame's protocol, we assume it is 802.3. This avoids + * a call to eth_type_trans(), which is not really relevant for our + * use case. + */ + if (!eth_proto_is_802_3(eth->h_proto)) + goto drop; + + odev = dev_get_by_index_rcu(net, slwt->oif); + if (!odev) + goto drop; + + /* As we accept Ethernet frames, make sure the egress device is of + * the correct type. + */ + if (odev->type != ARPHRD_ETHER) + goto drop; + + if (!(odev->flags & IFF_UP) || !netif_carrier_ok(odev)) + goto drop; + + skb_orphan(skb); + + if (skb_warn_if_lro(skb)) + goto drop; + + skb_forward_csum(skb); + + if (skb->len - ETH_HLEN > odev->mtu) + goto drop; + + skb->dev = odev; + skb->protocol = eth->h_proto; + + return dev_queue_xmit(skb); + +drop: + kfree_skb(skb); + return -EINVAL; +} + +static int input_action_end_dx6_finish(struct net *net, struct sock *sk, + struct sk_buff *skb) +{ + struct dst_entry *orig_dst = skb_dst(skb); + struct in6_addr *nhaddr = NULL; + struct seg6_local_lwt *slwt; + + slwt = seg6_local_lwtunnel(orig_dst->lwtstate); + + /* The inner packet is not associated to any local interface, + * so we do not call netif_rx(). + * + * If slwt->nh6 is set to ::, then lookup the nexthop for the + * inner packet's DA. Otherwise, use the specified nexthop. + */ + if (!ipv6_addr_any(&slwt->nh6)) + nhaddr = &slwt->nh6; + + seg6_lookup_nexthop(skb, nhaddr, 0); + + return dst_input(skb); +} + +/* decapsulate and forward to specified nexthop */ +static int input_action_end_dx6(struct sk_buff *skb, + struct seg6_local_lwt *slwt) +{ + /* this function accepts IPv6 encapsulated packets, with either + * an SRH with SL=0, or no SRH. + */ + + if (!decap_and_validate(skb, IPPROTO_IPV6)) + goto drop; + + if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) + goto drop; + + skb_set_transport_header(skb, sizeof(struct ipv6hdr)); + nf_reset_ct(skb); + + if (static_branch_unlikely(&nf_hooks_lwtunnel_enabled)) + return NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING, + dev_net(skb->dev), NULL, skb, NULL, + skb_dst(skb)->dev, input_action_end_dx6_finish); + + return input_action_end_dx6_finish(dev_net(skb->dev), NULL, skb); +drop: + kfree_skb(skb); + return -EINVAL; +} + +static int input_action_end_dx4_finish(struct net *net, struct sock *sk, + struct sk_buff *skb) +{ + struct dst_entry *orig_dst = skb_dst(skb); + struct seg6_local_lwt *slwt; + struct iphdr *iph; + __be32 nhaddr; + int err; + + slwt = seg6_local_lwtunnel(orig_dst->lwtstate); + + iph = ip_hdr(skb); + + nhaddr = slwt->nh4.s_addr ?: iph->daddr; + + skb_dst_drop(skb); + + err = ip_route_input(skb, nhaddr, iph->saddr, 0, skb->dev); + if (err) { + kfree_skb(skb); + return -EINVAL; + } + + return dst_input(skb); +} + +static int input_action_end_dx4(struct sk_buff *skb, + struct seg6_local_lwt *slwt) +{ + if (!decap_and_validate(skb, IPPROTO_IPIP)) + goto drop; + + if (!pskb_may_pull(skb, sizeof(struct iphdr))) + goto drop; + + skb->protocol = htons(ETH_P_IP); + skb_set_transport_header(skb, sizeof(struct iphdr)); + nf_reset_ct(skb); + + if (static_branch_unlikely(&nf_hooks_lwtunnel_enabled)) + return NF_HOOK(NFPROTO_IPV4, NF_INET_PRE_ROUTING, + dev_net(skb->dev), NULL, skb, NULL, + skb_dst(skb)->dev, input_action_end_dx4_finish); + + return input_action_end_dx4_finish(dev_net(skb->dev), NULL, skb); +drop: + kfree_skb(skb); + return -EINVAL; +} + +#ifdef CONFIG_NET_L3_MASTER_DEV +static struct net *fib6_config_get_net(const struct fib6_config *fib6_cfg) +{ + const struct nl_info *nli = &fib6_cfg->fc_nlinfo; + + return nli->nl_net; +} + +static int __seg6_end_dt_vrf_build(struct seg6_local_lwt *slwt, const void *cfg, + u16 family, struct netlink_ext_ack *extack) +{ + struct seg6_end_dt_info *info = &slwt->dt_info; + int vrf_ifindex; + struct net *net; + + net = fib6_config_get_net(cfg); + + /* note that vrf_table was already set by parse_nla_vrftable() */ + vrf_ifindex = l3mdev_ifindex_lookup_by_table_id(L3MDEV_TYPE_VRF, net, + info->vrf_table); + if (vrf_ifindex < 0) { + if (vrf_ifindex == -EPERM) { + NL_SET_ERR_MSG(extack, + "Strict mode for VRF is disabled"); + } else if (vrf_ifindex == -ENODEV) { + NL_SET_ERR_MSG(extack, + "Table has no associated VRF device"); + } else { + pr_debug("seg6local: SRv6 End.DT* creation error=%d\n", + vrf_ifindex); + } + + return vrf_ifindex; + } + + info->net = net; + info->vrf_ifindex = vrf_ifindex; + + info->family = family; + info->mode = DT_VRF_MODE; + + return 0; +} + +/* The SRv6 End.DT4/DT6 behavior extracts the inner (IPv4/IPv6) packet and + * routes the IPv4/IPv6 packet by looking at the configured routing table. + * + * In the SRv6 End.DT4/DT6 use case, we can receive traffic (IPv6+Segment + * Routing Header packets) from several interfaces and the outer IPv6 + * destination address (DA) is used for retrieving the specific instance of the + * End.DT4/DT6 behavior that should process the packets. + * + * However, the inner IPv4/IPv6 packet is not really bound to any receiving + * interface and thus the End.DT4/DT6 sets the VRF (associated with the + * corresponding routing table) as the *receiving* interface. + * In other words, the End.DT4/DT6 processes a packet as if it has been received + * directly by the VRF (and not by one of its slave devices, if any). + * In this way, the VRF interface is used for routing the IPv4/IPv6 packet in + * according to the routing table configured by the End.DT4/DT6 instance. + * + * This design allows you to get some interesting features like: + * 1) the statistics on rx packets; + * 2) the possibility to install a packet sniffer on the receiving interface + * (the VRF one) for looking at the incoming packets; + * 3) the possibility to leverage the netfilter prerouting hook for the inner + * IPv4 packet. + * + * This function returns: + * - the sk_buff* when the VRF rcv handler has processed the packet correctly; + * - NULL when the skb is consumed by the VRF rcv handler; + * - a pointer which encodes a negative error number in case of error. + * Note that in this case, the function takes care of freeing the skb. + */ +static struct sk_buff *end_dt_vrf_rcv(struct sk_buff *skb, u16 family, + struct net_device *dev) +{ + /* based on l3mdev_ip_rcv; we are only interested in the master */ + if (unlikely(!netif_is_l3_master(dev) && !netif_has_l3_rx_handler(dev))) + goto drop; + + if (unlikely(!dev->l3mdev_ops->l3mdev_l3_rcv)) + goto drop; + + /* the decap packet IPv4/IPv6 does not come with any mac header info. + * We must unset the mac header to allow the VRF device to rebuild it, + * just in case there is a sniffer attached on the device. + */ + skb_unset_mac_header(skb); + + skb = dev->l3mdev_ops->l3mdev_l3_rcv(dev, skb, family); + if (!skb) + /* the skb buffer was consumed by the handler */ + return NULL; + + /* when a packet is received by a VRF or by one of its slaves, the + * master device reference is set into the skb. + */ + if (unlikely(skb->dev != dev || skb->skb_iif != dev->ifindex)) + goto drop; + + return skb; + +drop: + kfree_skb(skb); + return ERR_PTR(-EINVAL); +} + +static struct net_device *end_dt_get_vrf_rcu(struct sk_buff *skb, + struct seg6_end_dt_info *info) +{ + int vrf_ifindex = info->vrf_ifindex; + struct net *net = info->net; + + if (unlikely(vrf_ifindex < 0)) + goto error; + + if (unlikely(!net_eq(dev_net(skb->dev), net))) + goto error; + + return dev_get_by_index_rcu(net, vrf_ifindex); + +error: + return NULL; +} + +static struct sk_buff *end_dt_vrf_core(struct sk_buff *skb, + struct seg6_local_lwt *slwt, u16 family) +{ + struct seg6_end_dt_info *info = &slwt->dt_info; + struct net_device *vrf; + __be16 protocol; + int hdrlen; + + vrf = end_dt_get_vrf_rcu(skb, info); + if (unlikely(!vrf)) + goto drop; + + switch (family) { + case AF_INET: + protocol = htons(ETH_P_IP); + hdrlen = sizeof(struct iphdr); + break; + case AF_INET6: + protocol = htons(ETH_P_IPV6); + hdrlen = sizeof(struct ipv6hdr); + break; + case AF_UNSPEC: + fallthrough; + default: + goto drop; + } + + if (unlikely(info->family != AF_UNSPEC && info->family != family)) { + pr_warn_once("seg6local: SRv6 End.DT* family mismatch"); + goto drop; + } + + skb->protocol = protocol; + + skb_dst_drop(skb); + + skb_set_transport_header(skb, hdrlen); + nf_reset_ct(skb); + + return end_dt_vrf_rcv(skb, family, vrf); + +drop: + kfree_skb(skb); + return ERR_PTR(-EINVAL); +} + +static int input_action_end_dt4(struct sk_buff *skb, + struct seg6_local_lwt *slwt) +{ + struct iphdr *iph; + int err; + + if (!decap_and_validate(skb, IPPROTO_IPIP)) + goto drop; + + if (!pskb_may_pull(skb, sizeof(struct iphdr))) + goto drop; + + skb = end_dt_vrf_core(skb, slwt, AF_INET); + if (!skb) + /* packet has been processed and consumed by the VRF */ + return 0; + + if (IS_ERR(skb)) + return PTR_ERR(skb); + + iph = ip_hdr(skb); + + err = ip_route_input(skb, iph->daddr, iph->saddr, 0, skb->dev); + if (unlikely(err)) + goto drop; + + return dst_input(skb); + +drop: + kfree_skb(skb); + return -EINVAL; +} + +static int seg6_end_dt4_build(struct seg6_local_lwt *slwt, const void *cfg, + struct netlink_ext_ack *extack) +{ + return __seg6_end_dt_vrf_build(slwt, cfg, AF_INET, extack); +} + +static enum +seg6_end_dt_mode seg6_end_dt6_parse_mode(struct seg6_local_lwt *slwt) +{ + unsigned long parsed_optattrs = slwt->parsed_optattrs; + bool legacy, vrfmode; + + legacy = !!(parsed_optattrs & SEG6_F_ATTR(SEG6_LOCAL_TABLE)); + vrfmode = !!(parsed_optattrs & SEG6_F_ATTR(SEG6_LOCAL_VRFTABLE)); + + if (!(legacy ^ vrfmode)) + /* both are absent or present: invalid DT6 mode */ + return DT_INVALID_MODE; + + return legacy ? DT_LEGACY_MODE : DT_VRF_MODE; +} + +static enum seg6_end_dt_mode seg6_end_dt6_get_mode(struct seg6_local_lwt *slwt) +{ + struct seg6_end_dt_info *info = &slwt->dt_info; + + return info->mode; +} + +static int seg6_end_dt6_build(struct seg6_local_lwt *slwt, const void *cfg, + struct netlink_ext_ack *extack) +{ + enum seg6_end_dt_mode mode = seg6_end_dt6_parse_mode(slwt); + struct seg6_end_dt_info *info = &slwt->dt_info; + + switch (mode) { + case DT_LEGACY_MODE: + info->mode = DT_LEGACY_MODE; + return 0; + case DT_VRF_MODE: + return __seg6_end_dt_vrf_build(slwt, cfg, AF_INET6, extack); + default: + NL_SET_ERR_MSG(extack, "table or vrftable must be specified"); + return -EINVAL; + } +} +#endif + +static int input_action_end_dt6(struct sk_buff *skb, + struct seg6_local_lwt *slwt) +{ + if (!decap_and_validate(skb, IPPROTO_IPV6)) + goto drop; + + if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) + goto drop; + +#ifdef CONFIG_NET_L3_MASTER_DEV + if (seg6_end_dt6_get_mode(slwt) == DT_LEGACY_MODE) + goto legacy_mode; + + /* DT6_VRF_MODE */ + skb = end_dt_vrf_core(skb, slwt, AF_INET6); + if (!skb) + /* packet has been processed and consumed by the VRF */ + return 0; + + if (IS_ERR(skb)) + return PTR_ERR(skb); + + /* note: this time we do not need to specify the table because the VRF + * takes care of selecting the correct table. + */ + seg6_lookup_any_nexthop(skb, NULL, 0, true); + + return dst_input(skb); + +legacy_mode: +#endif + skb_set_transport_header(skb, sizeof(struct ipv6hdr)); + + seg6_lookup_any_nexthop(skb, NULL, slwt->table, true); + + return dst_input(skb); + +drop: + kfree_skb(skb); + return -EINVAL; +} + +#ifdef CONFIG_NET_L3_MASTER_DEV +static int seg6_end_dt46_build(struct seg6_local_lwt *slwt, const void *cfg, + struct netlink_ext_ack *extack) +{ + return __seg6_end_dt_vrf_build(slwt, cfg, AF_UNSPEC, extack); +} + +static int input_action_end_dt46(struct sk_buff *skb, + struct seg6_local_lwt *slwt) +{ + unsigned int off = 0; + int nexthdr; + + nexthdr = ipv6_find_hdr(skb, &off, -1, NULL, NULL); + if (unlikely(nexthdr < 0)) + goto drop; + + switch (nexthdr) { + case IPPROTO_IPIP: + return input_action_end_dt4(skb, slwt); + case IPPROTO_IPV6: + return input_action_end_dt6(skb, slwt); + } + +drop: + kfree_skb(skb); + return -EINVAL; +} +#endif + +/* push an SRH on top of the current one */ +static int input_action_end_b6(struct sk_buff *skb, struct seg6_local_lwt *slwt) +{ + struct ipv6_sr_hdr *srh; + int err = -EINVAL; + + srh = get_and_validate_srh(skb); + if (!srh) + goto drop; + + err = seg6_do_srh_inline(skb, slwt->srh); + if (err) + goto drop; + + skb_set_transport_header(skb, sizeof(struct ipv6hdr)); + + seg6_lookup_nexthop(skb, NULL, 0); + + return dst_input(skb); + +drop: + kfree_skb(skb); + return err; +} + +/* encapsulate within an outer IPv6 header and a specified SRH */ +static int input_action_end_b6_encap(struct sk_buff *skb, + struct seg6_local_lwt *slwt) +{ + struct ipv6_sr_hdr *srh; + int err = -EINVAL; + + srh = get_and_validate_srh(skb); + if (!srh) + goto drop; + + advance_nextseg(srh, &ipv6_hdr(skb)->daddr); + + skb_reset_inner_headers(skb); + skb->encapsulation = 1; + + err = seg6_do_srh_encap(skb, slwt->srh, IPPROTO_IPV6); + if (err) + goto drop; + + skb_set_transport_header(skb, sizeof(struct ipv6hdr)); + + seg6_lookup_nexthop(skb, NULL, 0); + + return dst_input(skb); + +drop: + kfree_skb(skb); + return err; +} + +DEFINE_PER_CPU(struct seg6_bpf_srh_state, seg6_bpf_srh_states); + +bool seg6_bpf_has_valid_srh(struct sk_buff *skb) +{ + struct seg6_bpf_srh_state *srh_state = + this_cpu_ptr(&seg6_bpf_srh_states); + struct ipv6_sr_hdr *srh = srh_state->srh; + + if (unlikely(srh == NULL)) + return false; + + if (unlikely(!srh_state->valid)) { + if ((srh_state->hdrlen & 7) != 0) + return false; + + srh->hdrlen = (u8)(srh_state->hdrlen >> 3); + if (!seg6_validate_srh(srh, (srh->hdrlen + 1) << 3, true)) + return false; + + srh_state->valid = true; + } + + return true; +} + +static int input_action_end_bpf(struct sk_buff *skb, + struct seg6_local_lwt *slwt) +{ + struct seg6_bpf_srh_state *srh_state = + this_cpu_ptr(&seg6_bpf_srh_states); + struct ipv6_sr_hdr *srh; + int ret; + + srh = get_and_validate_srh(skb); + if (!srh) { + kfree_skb(skb); + return -EINVAL; + } + advance_nextseg(srh, &ipv6_hdr(skb)->daddr); + + /* preempt_disable is needed to protect the per-CPU buffer srh_state, + * which is also accessed by the bpf_lwt_seg6_* helpers + */ + preempt_disable(); + srh_state->srh = srh; + srh_state->hdrlen = srh->hdrlen << 3; + srh_state->valid = true; + + rcu_read_lock(); + bpf_compute_data_pointers(skb); + ret = bpf_prog_run_save_cb(slwt->bpf.prog, skb); + rcu_read_unlock(); + + switch (ret) { + case BPF_OK: + case BPF_REDIRECT: + break; + case BPF_DROP: + goto drop; + default: + pr_warn_once("bpf-seg6local: Illegal return value %u\n", ret); + goto drop; + } + + if (srh_state->srh && !seg6_bpf_has_valid_srh(skb)) + goto drop; + + preempt_enable(); + if (ret != BPF_REDIRECT) + seg6_lookup_nexthop(skb, NULL, 0); + + return dst_input(skb); + +drop: + preempt_enable(); + kfree_skb(skb); + return -EINVAL; +} + +static struct seg6_action_desc seg6_action_table[] = { + { + .action = SEG6_LOCAL_ACTION_END, + .attrs = 0, + .optattrs = SEG6_F_LOCAL_COUNTERS | + SEG6_F_ATTR(SEG6_LOCAL_FLAVORS), + .input = input_action_end, + }, + { + .action = SEG6_LOCAL_ACTION_END_X, + .attrs = SEG6_F_ATTR(SEG6_LOCAL_NH6), + .optattrs = SEG6_F_LOCAL_COUNTERS, + .input = input_action_end_x, + }, + { + .action = SEG6_LOCAL_ACTION_END_T, + .attrs = SEG6_F_ATTR(SEG6_LOCAL_TABLE), + .optattrs = SEG6_F_LOCAL_COUNTERS, + .input = input_action_end_t, + }, + { + .action = SEG6_LOCAL_ACTION_END_DX2, + .attrs = SEG6_F_ATTR(SEG6_LOCAL_OIF), + .optattrs = SEG6_F_LOCAL_COUNTERS, + .input = input_action_end_dx2, + }, + { + .action = SEG6_LOCAL_ACTION_END_DX6, + .attrs = SEG6_F_ATTR(SEG6_LOCAL_NH6), + .optattrs = SEG6_F_LOCAL_COUNTERS, + .input = input_action_end_dx6, + }, + { + .action = SEG6_LOCAL_ACTION_END_DX4, + .attrs = SEG6_F_ATTR(SEG6_LOCAL_NH4), + .optattrs = SEG6_F_LOCAL_COUNTERS, + .input = input_action_end_dx4, + }, + { + .action = SEG6_LOCAL_ACTION_END_DT4, + .attrs = SEG6_F_ATTR(SEG6_LOCAL_VRFTABLE), + .optattrs = SEG6_F_LOCAL_COUNTERS, +#ifdef CONFIG_NET_L3_MASTER_DEV + .input = input_action_end_dt4, + .slwt_ops = { + .build_state = seg6_end_dt4_build, + }, +#endif + }, + { + .action = SEG6_LOCAL_ACTION_END_DT6, +#ifdef CONFIG_NET_L3_MASTER_DEV + .attrs = 0, + .optattrs = SEG6_F_LOCAL_COUNTERS | + SEG6_F_ATTR(SEG6_LOCAL_TABLE) | + SEG6_F_ATTR(SEG6_LOCAL_VRFTABLE), + .slwt_ops = { + .build_state = seg6_end_dt6_build, + }, +#else + .attrs = SEG6_F_ATTR(SEG6_LOCAL_TABLE), + .optattrs = SEG6_F_LOCAL_COUNTERS, +#endif + .input = input_action_end_dt6, + }, + { + .action = SEG6_LOCAL_ACTION_END_DT46, + .attrs = SEG6_F_ATTR(SEG6_LOCAL_VRFTABLE), + .optattrs = SEG6_F_LOCAL_COUNTERS, +#ifdef CONFIG_NET_L3_MASTER_DEV + .input = input_action_end_dt46, + .slwt_ops = { + .build_state = seg6_end_dt46_build, + }, +#endif + }, + { + .action = SEG6_LOCAL_ACTION_END_B6, + .attrs = SEG6_F_ATTR(SEG6_LOCAL_SRH), + .optattrs = SEG6_F_LOCAL_COUNTERS, + .input = input_action_end_b6, + }, + { + .action = SEG6_LOCAL_ACTION_END_B6_ENCAP, + .attrs = SEG6_F_ATTR(SEG6_LOCAL_SRH), + .optattrs = SEG6_F_LOCAL_COUNTERS, + .input = input_action_end_b6_encap, + .static_headroom = sizeof(struct ipv6hdr), + }, + { + .action = SEG6_LOCAL_ACTION_END_BPF, + .attrs = SEG6_F_ATTR(SEG6_LOCAL_BPF), + .optattrs = SEG6_F_LOCAL_COUNTERS, + .input = input_action_end_bpf, + }, + +}; + +static struct seg6_action_desc *__get_action_desc(int action) +{ + struct seg6_action_desc *desc; + int i, count; + + count = ARRAY_SIZE(seg6_action_table); + for (i = 0; i < count; i++) { + desc = &seg6_action_table[i]; + if (desc->action == action) + return desc; + } + + return NULL; +} + +static bool seg6_lwtunnel_counters_enabled(struct seg6_local_lwt *slwt) +{ + return slwt->parsed_optattrs & SEG6_F_LOCAL_COUNTERS; +} + +static void seg6_local_update_counters(struct seg6_local_lwt *slwt, + unsigned int len, int err) +{ + struct pcpu_seg6_local_counters *pcounters; + + pcounters = this_cpu_ptr(slwt->pcpu_counters); + u64_stats_update_begin(&pcounters->syncp); + + if (likely(!err)) { + u64_stats_inc(&pcounters->packets); + u64_stats_add(&pcounters->bytes, len); + } else { + u64_stats_inc(&pcounters->errors); + } + + u64_stats_update_end(&pcounters->syncp); +} + +static int seg6_local_input_core(struct net *net, struct sock *sk, + struct sk_buff *skb) +{ + struct dst_entry *orig_dst = skb_dst(skb); + struct seg6_action_desc *desc; + struct seg6_local_lwt *slwt; + unsigned int len = skb->len; + int rc; + + slwt = seg6_local_lwtunnel(orig_dst->lwtstate); + desc = slwt->desc; + + rc = desc->input(skb, slwt); + + if (!seg6_lwtunnel_counters_enabled(slwt)) + return rc; + + seg6_local_update_counters(slwt, len, rc); + + return rc; +} + +static int seg6_local_input(struct sk_buff *skb) +{ + if (skb->protocol != htons(ETH_P_IPV6)) { + kfree_skb(skb); + return -EINVAL; + } + + if (static_branch_unlikely(&nf_hooks_lwtunnel_enabled)) + return NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_IN, + dev_net(skb->dev), NULL, skb, skb->dev, NULL, + seg6_local_input_core); + + return seg6_local_input_core(dev_net(skb->dev), NULL, skb); +} + +static const struct nla_policy seg6_local_policy[SEG6_LOCAL_MAX + 1] = { + [SEG6_LOCAL_ACTION] = { .type = NLA_U32 }, + [SEG6_LOCAL_SRH] = { .type = NLA_BINARY }, + [SEG6_LOCAL_TABLE] = { .type = NLA_U32 }, + [SEG6_LOCAL_VRFTABLE] = { .type = NLA_U32 }, + [SEG6_LOCAL_NH4] = { .type = NLA_BINARY, + .len = sizeof(struct in_addr) }, + [SEG6_LOCAL_NH6] = { .type = NLA_BINARY, + .len = sizeof(struct in6_addr) }, + [SEG6_LOCAL_IIF] = { .type = NLA_U32 }, + [SEG6_LOCAL_OIF] = { .type = NLA_U32 }, + [SEG6_LOCAL_BPF] = { .type = NLA_NESTED }, + [SEG6_LOCAL_COUNTERS] = { .type = NLA_NESTED }, + [SEG6_LOCAL_FLAVORS] = { .type = NLA_NESTED }, +}; + +static int parse_nla_srh(struct nlattr **attrs, struct seg6_local_lwt *slwt, + struct netlink_ext_ack *extack) +{ + struct ipv6_sr_hdr *srh; + int len; + + srh = nla_data(attrs[SEG6_LOCAL_SRH]); + len = nla_len(attrs[SEG6_LOCAL_SRH]); + + /* SRH must contain at least one segment */ + if (len < sizeof(*srh) + sizeof(struct in6_addr)) + return -EINVAL; + + if (!seg6_validate_srh(srh, len, false)) + return -EINVAL; + + slwt->srh = kmemdup(srh, len, GFP_KERNEL); + if (!slwt->srh) + return -ENOMEM; + + slwt->headroom += len; + + return 0; +} + +static int put_nla_srh(struct sk_buff *skb, struct seg6_local_lwt *slwt) +{ + struct ipv6_sr_hdr *srh; + struct nlattr *nla; + int len; + + srh = slwt->srh; + len = (srh->hdrlen + 1) << 3; + + nla = nla_reserve(skb, SEG6_LOCAL_SRH, len); + if (!nla) + return -EMSGSIZE; + + memcpy(nla_data(nla), srh, len); + + return 0; +} + +static int cmp_nla_srh(struct seg6_local_lwt *a, struct seg6_local_lwt *b) +{ + int len = (a->srh->hdrlen + 1) << 3; + + if (len != ((b->srh->hdrlen + 1) << 3)) + return 1; + + return memcmp(a->srh, b->srh, len); +} + +static void destroy_attr_srh(struct seg6_local_lwt *slwt) +{ + kfree(slwt->srh); +} + +static int parse_nla_table(struct nlattr **attrs, struct seg6_local_lwt *slwt, + struct netlink_ext_ack *extack) +{ + slwt->table = nla_get_u32(attrs[SEG6_LOCAL_TABLE]); + + return 0; +} + +static int put_nla_table(struct sk_buff *skb, struct seg6_local_lwt *slwt) +{ + if (nla_put_u32(skb, SEG6_LOCAL_TABLE, slwt->table)) + return -EMSGSIZE; + + return 0; +} + +static int cmp_nla_table(struct seg6_local_lwt *a, struct seg6_local_lwt *b) +{ + if (a->table != b->table) + return 1; + + return 0; +} + +static struct +seg6_end_dt_info *seg6_possible_end_dt_info(struct seg6_local_lwt *slwt) +{ +#ifdef CONFIG_NET_L3_MASTER_DEV + return &slwt->dt_info; +#else + return ERR_PTR(-EOPNOTSUPP); +#endif +} + +static int parse_nla_vrftable(struct nlattr **attrs, + struct seg6_local_lwt *slwt, + struct netlink_ext_ack *extack) +{ + struct seg6_end_dt_info *info = seg6_possible_end_dt_info(slwt); + + if (IS_ERR(info)) + return PTR_ERR(info); + + info->vrf_table = nla_get_u32(attrs[SEG6_LOCAL_VRFTABLE]); + + return 0; +} + +static int put_nla_vrftable(struct sk_buff *skb, struct seg6_local_lwt *slwt) +{ + struct seg6_end_dt_info *info = seg6_possible_end_dt_info(slwt); + + if (IS_ERR(info)) + return PTR_ERR(info); + + if (nla_put_u32(skb, SEG6_LOCAL_VRFTABLE, info->vrf_table)) + return -EMSGSIZE; + + return 0; +} + +static int cmp_nla_vrftable(struct seg6_local_lwt *a, struct seg6_local_lwt *b) +{ + struct seg6_end_dt_info *info_a = seg6_possible_end_dt_info(a); + struct seg6_end_dt_info *info_b = seg6_possible_end_dt_info(b); + + if (info_a->vrf_table != info_b->vrf_table) + return 1; + + return 0; +} + +static int parse_nla_nh4(struct nlattr **attrs, struct seg6_local_lwt *slwt, + struct netlink_ext_ack *extack) +{ + memcpy(&slwt->nh4, nla_data(attrs[SEG6_LOCAL_NH4]), + sizeof(struct in_addr)); + + return 0; +} + +static int put_nla_nh4(struct sk_buff *skb, struct seg6_local_lwt *slwt) +{ + struct nlattr *nla; + + nla = nla_reserve(skb, SEG6_LOCAL_NH4, sizeof(struct in_addr)); + if (!nla) + return -EMSGSIZE; + + memcpy(nla_data(nla), &slwt->nh4, sizeof(struct in_addr)); + + return 0; +} + +static int cmp_nla_nh4(struct seg6_local_lwt *a, struct seg6_local_lwt *b) +{ + return memcmp(&a->nh4, &b->nh4, sizeof(struct in_addr)); +} + +static int parse_nla_nh6(struct nlattr **attrs, struct seg6_local_lwt *slwt, + struct netlink_ext_ack *extack) +{ + memcpy(&slwt->nh6, nla_data(attrs[SEG6_LOCAL_NH6]), + sizeof(struct in6_addr)); + + return 0; +} + +static int put_nla_nh6(struct sk_buff *skb, struct seg6_local_lwt *slwt) +{ + struct nlattr *nla; + + nla = nla_reserve(skb, SEG6_LOCAL_NH6, sizeof(struct in6_addr)); + if (!nla) + return -EMSGSIZE; + + memcpy(nla_data(nla), &slwt->nh6, sizeof(struct in6_addr)); + + return 0; +} + +static int cmp_nla_nh6(struct seg6_local_lwt *a, struct seg6_local_lwt *b) +{ + return memcmp(&a->nh6, &b->nh6, sizeof(struct in6_addr)); +} + +static int parse_nla_iif(struct nlattr **attrs, struct seg6_local_lwt *slwt, + struct netlink_ext_ack *extack) +{ + slwt->iif = nla_get_u32(attrs[SEG6_LOCAL_IIF]); + + return 0; +} + +static int put_nla_iif(struct sk_buff *skb, struct seg6_local_lwt *slwt) +{ + if (nla_put_u32(skb, SEG6_LOCAL_IIF, slwt->iif)) + return -EMSGSIZE; + + return 0; +} + +static int cmp_nla_iif(struct seg6_local_lwt *a, struct seg6_local_lwt *b) +{ + if (a->iif != b->iif) + return 1; + + return 0; +} + +static int parse_nla_oif(struct nlattr **attrs, struct seg6_local_lwt *slwt, + struct netlink_ext_ack *extack) +{ + slwt->oif = nla_get_u32(attrs[SEG6_LOCAL_OIF]); + + return 0; +} + +static int put_nla_oif(struct sk_buff *skb, struct seg6_local_lwt *slwt) +{ + if (nla_put_u32(skb, SEG6_LOCAL_OIF, slwt->oif)) + return -EMSGSIZE; + + return 0; +} + +static int cmp_nla_oif(struct seg6_local_lwt *a, struct seg6_local_lwt *b) +{ + if (a->oif != b->oif) + return 1; + + return 0; +} + +#define MAX_PROG_NAME 256 +static const struct nla_policy bpf_prog_policy[SEG6_LOCAL_BPF_PROG_MAX + 1] = { + [SEG6_LOCAL_BPF_PROG] = { .type = NLA_U32, }, + [SEG6_LOCAL_BPF_PROG_NAME] = { .type = NLA_NUL_STRING, + .len = MAX_PROG_NAME }, +}; + +static int parse_nla_bpf(struct nlattr **attrs, struct seg6_local_lwt *slwt, + struct netlink_ext_ack *extack) +{ + struct nlattr *tb[SEG6_LOCAL_BPF_PROG_MAX + 1]; + struct bpf_prog *p; + int ret; + u32 fd; + + ret = nla_parse_nested_deprecated(tb, SEG6_LOCAL_BPF_PROG_MAX, + attrs[SEG6_LOCAL_BPF], + bpf_prog_policy, NULL); + if (ret < 0) + return ret; + + if (!tb[SEG6_LOCAL_BPF_PROG] || !tb[SEG6_LOCAL_BPF_PROG_NAME]) + return -EINVAL; + + slwt->bpf.name = nla_memdup(tb[SEG6_LOCAL_BPF_PROG_NAME], GFP_KERNEL); + if (!slwt->bpf.name) + return -ENOMEM; + + fd = nla_get_u32(tb[SEG6_LOCAL_BPF_PROG]); + p = bpf_prog_get_type(fd, BPF_PROG_TYPE_LWT_SEG6LOCAL); + if (IS_ERR(p)) { + kfree(slwt->bpf.name); + return PTR_ERR(p); + } + + slwt->bpf.prog = p; + return 0; +} + +static int put_nla_bpf(struct sk_buff *skb, struct seg6_local_lwt *slwt) +{ + struct nlattr *nest; + + if (!slwt->bpf.prog) + return 0; + + nest = nla_nest_start_noflag(skb, SEG6_LOCAL_BPF); + if (!nest) + return -EMSGSIZE; + + if (nla_put_u32(skb, SEG6_LOCAL_BPF_PROG, slwt->bpf.prog->aux->id)) + return -EMSGSIZE; + + if (slwt->bpf.name && + nla_put_string(skb, SEG6_LOCAL_BPF_PROG_NAME, slwt->bpf.name)) + return -EMSGSIZE; + + return nla_nest_end(skb, nest); +} + +static int cmp_nla_bpf(struct seg6_local_lwt *a, struct seg6_local_lwt *b) +{ + if (!a->bpf.name && !b->bpf.name) + return 0; + + if (!a->bpf.name || !b->bpf.name) + return 1; + + return strcmp(a->bpf.name, b->bpf.name); +} + +static void destroy_attr_bpf(struct seg6_local_lwt *slwt) +{ + kfree(slwt->bpf.name); + if (slwt->bpf.prog) + bpf_prog_put(slwt->bpf.prog); +} + +static const struct +nla_policy seg6_local_counters_policy[SEG6_LOCAL_CNT_MAX + 1] = { + [SEG6_LOCAL_CNT_PACKETS] = { .type = NLA_U64 }, + [SEG6_LOCAL_CNT_BYTES] = { .type = NLA_U64 }, + [SEG6_LOCAL_CNT_ERRORS] = { .type = NLA_U64 }, +}; + +static int parse_nla_counters(struct nlattr **attrs, + struct seg6_local_lwt *slwt, + struct netlink_ext_ack *extack) +{ + struct pcpu_seg6_local_counters __percpu *pcounters; + struct nlattr *tb[SEG6_LOCAL_CNT_MAX + 1]; + int ret; + + ret = nla_parse_nested_deprecated(tb, SEG6_LOCAL_CNT_MAX, + attrs[SEG6_LOCAL_COUNTERS], + seg6_local_counters_policy, NULL); + if (ret < 0) + return ret; + + /* basic support for SRv6 Behavior counters requires at least: + * packets, bytes and errors. + */ + if (!tb[SEG6_LOCAL_CNT_PACKETS] || !tb[SEG6_LOCAL_CNT_BYTES] || + !tb[SEG6_LOCAL_CNT_ERRORS]) + return -EINVAL; + + /* counters are always zero initialized */ + pcounters = seg6_local_alloc_pcpu_counters(GFP_KERNEL); + if (!pcounters) + return -ENOMEM; + + slwt->pcpu_counters = pcounters; + + return 0; +} + +static int seg6_local_fill_nla_counters(struct sk_buff *skb, + struct seg6_local_counters *counters) +{ + if (nla_put_u64_64bit(skb, SEG6_LOCAL_CNT_PACKETS, counters->packets, + SEG6_LOCAL_CNT_PAD)) + return -EMSGSIZE; + + if (nla_put_u64_64bit(skb, SEG6_LOCAL_CNT_BYTES, counters->bytes, + SEG6_LOCAL_CNT_PAD)) + return -EMSGSIZE; + + if (nla_put_u64_64bit(skb, SEG6_LOCAL_CNT_ERRORS, counters->errors, + SEG6_LOCAL_CNT_PAD)) + return -EMSGSIZE; + + return 0; +} + +static int put_nla_counters(struct sk_buff *skb, struct seg6_local_lwt *slwt) +{ + struct seg6_local_counters counters = { 0, 0, 0 }; + struct nlattr *nest; + int rc, i; + + nest = nla_nest_start(skb, SEG6_LOCAL_COUNTERS); + if (!nest) + return -EMSGSIZE; + + for_each_possible_cpu(i) { + struct pcpu_seg6_local_counters *pcounters; + u64 packets, bytes, errors; + unsigned int start; + + pcounters = per_cpu_ptr(slwt->pcpu_counters, i); + do { + start = u64_stats_fetch_begin_irq(&pcounters->syncp); + + packets = u64_stats_read(&pcounters->packets); + bytes = u64_stats_read(&pcounters->bytes); + errors = u64_stats_read(&pcounters->errors); + + } while (u64_stats_fetch_retry_irq(&pcounters->syncp, start)); + + counters.packets += packets; + counters.bytes += bytes; + counters.errors += errors; + } + + rc = seg6_local_fill_nla_counters(skb, &counters); + if (rc < 0) { + nla_nest_cancel(skb, nest); + return rc; + } + + return nla_nest_end(skb, nest); +} + +static int cmp_nla_counters(struct seg6_local_lwt *a, struct seg6_local_lwt *b) +{ + /* a and b are equal if both have pcpu_counters set or not */ + return (!!((unsigned long)a->pcpu_counters)) ^ + (!!((unsigned long)b->pcpu_counters)); +} + +static void destroy_attr_counters(struct seg6_local_lwt *slwt) +{ + free_percpu(slwt->pcpu_counters); +} + +static const +struct nla_policy seg6_local_flavors_policy[SEG6_LOCAL_FLV_MAX + 1] = { + [SEG6_LOCAL_FLV_OPERATION] = { .type = NLA_U32 }, + [SEG6_LOCAL_FLV_LCBLOCK_BITS] = { .type = NLA_U8 }, + [SEG6_LOCAL_FLV_LCNODE_FN_BITS] = { .type = NLA_U8 }, +}; + +/* check whether the lengths of the Locator-Block and Locator-Node Function + * are compatible with the dimension of a C-SID container. + */ +static int seg6_chk_next_csid_cfg(__u8 block_len, __u8 func_len) +{ + /* Locator-Block and Locator-Node Function cannot exceed 128 bits + * (i.e. C-SID container lenghts). + */ + if (next_csid_chk_cntr_bits(block_len, func_len)) + return -EINVAL; + + /* Locator-Block length must be greater than zero and evenly divisible + * by 8. There must be room for a Locator-Node Function, at least. + */ + if (next_csid_chk_lcblock_bits(block_len)) + return -EINVAL; + + /* Locator-Node Function length must be greater than zero and evenly + * divisible by 8. There must be room for the Locator-Block. + */ + if (next_csid_chk_lcnode_fn_bits(func_len)) + return -EINVAL; + + return 0; +} + +static int seg6_parse_nla_next_csid_cfg(struct nlattr **tb, + struct seg6_flavors_info *finfo, + struct netlink_ext_ack *extack) +{ + __u8 func_len = SEG6_LOCAL_LCNODE_FN_DBITS; + __u8 block_len = SEG6_LOCAL_LCBLOCK_DBITS; + int rc; + + if (tb[SEG6_LOCAL_FLV_LCBLOCK_BITS]) + block_len = nla_get_u8(tb[SEG6_LOCAL_FLV_LCBLOCK_BITS]); + + if (tb[SEG6_LOCAL_FLV_LCNODE_FN_BITS]) + func_len = nla_get_u8(tb[SEG6_LOCAL_FLV_LCNODE_FN_BITS]); + + rc = seg6_chk_next_csid_cfg(block_len, func_len); + if (rc < 0) { + NL_SET_ERR_MSG(extack, + "Invalid Locator Block/Node Function lengths"); + return rc; + } + + finfo->lcblock_bits = block_len; + finfo->lcnode_func_bits = func_len; + + return 0; +} + +static int parse_nla_flavors(struct nlattr **attrs, struct seg6_local_lwt *slwt, + struct netlink_ext_ack *extack) +{ + struct seg6_flavors_info *finfo = &slwt->flv_info; + struct nlattr *tb[SEG6_LOCAL_FLV_MAX + 1]; + unsigned long fops; + int rc; + + rc = nla_parse_nested_deprecated(tb, SEG6_LOCAL_FLV_MAX, + attrs[SEG6_LOCAL_FLAVORS], + seg6_local_flavors_policy, NULL); + if (rc < 0) + return rc; + + /* this attribute MUST always be present since it represents the Flavor + * operation(s) to be carried out. + */ + if (!tb[SEG6_LOCAL_FLV_OPERATION]) + return -EINVAL; + + fops = nla_get_u32(tb[SEG6_LOCAL_FLV_OPERATION]); + if (fops & ~SEG6_LOCAL_FLV_SUPP_OPS) { + NL_SET_ERR_MSG(extack, "Unsupported Flavor operation(s)"); + return -EOPNOTSUPP; + } + + finfo->flv_ops = fops; + + if (seg6_next_csid_enabled(fops)) { + /* Locator-Block and Locator-Node Function lengths can be + * provided by the user space. Otherwise, default values are + * applied. + */ + rc = seg6_parse_nla_next_csid_cfg(tb, finfo, extack); + if (rc < 0) + return rc; + } + + return 0; +} + +static int seg6_fill_nla_next_csid_cfg(struct sk_buff *skb, + struct seg6_flavors_info *finfo) +{ + if (nla_put_u8(skb, SEG6_LOCAL_FLV_LCBLOCK_BITS, finfo->lcblock_bits)) + return -EMSGSIZE; + + if (nla_put_u8(skb, SEG6_LOCAL_FLV_LCNODE_FN_BITS, + finfo->lcnode_func_bits)) + return -EMSGSIZE; + + return 0; +} + +static int put_nla_flavors(struct sk_buff *skb, struct seg6_local_lwt *slwt) +{ + struct seg6_flavors_info *finfo = &slwt->flv_info; + __u32 fops = finfo->flv_ops; + struct nlattr *nest; + int rc; + + nest = nla_nest_start(skb, SEG6_LOCAL_FLAVORS); + if (!nest) + return -EMSGSIZE; + + if (nla_put_u32(skb, SEG6_LOCAL_FLV_OPERATION, fops)) { + rc = -EMSGSIZE; + goto err; + } + + if (seg6_next_csid_enabled(fops)) { + rc = seg6_fill_nla_next_csid_cfg(skb, finfo); + if (rc < 0) + goto err; + } + + return nla_nest_end(skb, nest); + +err: + nla_nest_cancel(skb, nest); + return rc; +} + +static int seg6_cmp_nla_next_csid_cfg(struct seg6_flavors_info *finfo_a, + struct seg6_flavors_info *finfo_b) +{ + if (finfo_a->lcblock_bits != finfo_b->lcblock_bits) + return 1; + + if (finfo_a->lcnode_func_bits != finfo_b->lcnode_func_bits) + return 1; + + return 0; +} + +static int cmp_nla_flavors(struct seg6_local_lwt *a, struct seg6_local_lwt *b) +{ + struct seg6_flavors_info *finfo_a = &a->flv_info; + struct seg6_flavors_info *finfo_b = &b->flv_info; + + if (finfo_a->flv_ops != finfo_b->flv_ops) + return 1; + + if (seg6_next_csid_enabled(finfo_a->flv_ops)) { + if (seg6_cmp_nla_next_csid_cfg(finfo_a, finfo_b)) + return 1; + } + + return 0; +} + +static int encap_size_flavors(struct seg6_local_lwt *slwt) +{ + struct seg6_flavors_info *finfo = &slwt->flv_info; + int nlsize; + + nlsize = nla_total_size(0) + /* nest SEG6_LOCAL_FLAVORS */ + nla_total_size(4); /* SEG6_LOCAL_FLV_OPERATION */ + + if (seg6_next_csid_enabled(finfo->flv_ops)) + nlsize += nla_total_size(1) + /* SEG6_LOCAL_FLV_LCBLOCK_BITS */ + nla_total_size(1); /* SEG6_LOCAL_FLV_LCNODE_FN_BITS */ + + return nlsize; +} + +struct seg6_action_param { + int (*parse)(struct nlattr **attrs, struct seg6_local_lwt *slwt, + struct netlink_ext_ack *extack); + int (*put)(struct sk_buff *skb, struct seg6_local_lwt *slwt); + int (*cmp)(struct seg6_local_lwt *a, struct seg6_local_lwt *b); + + /* optional destroy() callback useful for releasing resources which + * have been previously acquired in the corresponding parse() + * function. + */ + void (*destroy)(struct seg6_local_lwt *slwt); +}; + +static struct seg6_action_param seg6_action_params[SEG6_LOCAL_MAX + 1] = { + [SEG6_LOCAL_SRH] = { .parse = parse_nla_srh, + .put = put_nla_srh, + .cmp = cmp_nla_srh, + .destroy = destroy_attr_srh }, + + [SEG6_LOCAL_TABLE] = { .parse = parse_nla_table, + .put = put_nla_table, + .cmp = cmp_nla_table }, + + [SEG6_LOCAL_NH4] = { .parse = parse_nla_nh4, + .put = put_nla_nh4, + .cmp = cmp_nla_nh4 }, + + [SEG6_LOCAL_NH6] = { .parse = parse_nla_nh6, + .put = put_nla_nh6, + .cmp = cmp_nla_nh6 }, + + [SEG6_LOCAL_IIF] = { .parse = parse_nla_iif, + .put = put_nla_iif, + .cmp = cmp_nla_iif }, + + [SEG6_LOCAL_OIF] = { .parse = parse_nla_oif, + .put = put_nla_oif, + .cmp = cmp_nla_oif }, + + [SEG6_LOCAL_BPF] = { .parse = parse_nla_bpf, + .put = put_nla_bpf, + .cmp = cmp_nla_bpf, + .destroy = destroy_attr_bpf }, + + [SEG6_LOCAL_VRFTABLE] = { .parse = parse_nla_vrftable, + .put = put_nla_vrftable, + .cmp = cmp_nla_vrftable }, + + [SEG6_LOCAL_COUNTERS] = { .parse = parse_nla_counters, + .put = put_nla_counters, + .cmp = cmp_nla_counters, + .destroy = destroy_attr_counters }, + + [SEG6_LOCAL_FLAVORS] = { .parse = parse_nla_flavors, + .put = put_nla_flavors, + .cmp = cmp_nla_flavors }, +}; + +/* call the destroy() callback (if available) for each set attribute in + * @parsed_attrs, starting from the first attribute up to the @max_parsed + * (excluded) attribute. + */ +static void __destroy_attrs(unsigned long parsed_attrs, int max_parsed, + struct seg6_local_lwt *slwt) +{ + struct seg6_action_param *param; + int i; + + /* Every required seg6local attribute is identified by an ID which is + * encoded as a flag (i.e: 1 << ID) in the 'attrs' bitmask; + * + * We scan the 'parsed_attrs' bitmask, starting from the first attribute + * up to the @max_parsed (excluded) attribute. + * For each set attribute, we retrieve the corresponding destroy() + * callback. If the callback is not available, then we skip to the next + * attribute; otherwise, we call the destroy() callback. + */ + for (i = SEG6_LOCAL_SRH; i < max_parsed; ++i) { + if (!(parsed_attrs & SEG6_F_ATTR(i))) + continue; + + param = &seg6_action_params[i]; + + if (param->destroy) + param->destroy(slwt); + } +} + +/* release all the resources that may have been acquired during parsing + * operations. + */ +static void destroy_attrs(struct seg6_local_lwt *slwt) +{ + unsigned long attrs = slwt->desc->attrs | slwt->parsed_optattrs; + + __destroy_attrs(attrs, SEG6_LOCAL_MAX + 1, slwt); +} + +static int parse_nla_optional_attrs(struct nlattr **attrs, + struct seg6_local_lwt *slwt, + struct netlink_ext_ack *extack) +{ + struct seg6_action_desc *desc = slwt->desc; + unsigned long parsed_optattrs = 0; + struct seg6_action_param *param; + int err, i; + + for (i = SEG6_LOCAL_SRH; i < SEG6_LOCAL_MAX + 1; ++i) { + if (!(desc->optattrs & SEG6_F_ATTR(i)) || !attrs[i]) + continue; + + /* once here, the i-th attribute is provided by the + * userspace AND it is identified optional as well. + */ + param = &seg6_action_params[i]; + + err = param->parse(attrs, slwt, extack); + if (err < 0) + goto parse_optattrs_err; + + /* current attribute has been correctly parsed */ + parsed_optattrs |= SEG6_F_ATTR(i); + } + + /* store in the tunnel state all the optional attributed successfully + * parsed. + */ + slwt->parsed_optattrs = parsed_optattrs; + + return 0; + +parse_optattrs_err: + __destroy_attrs(parsed_optattrs, i, slwt); + + return err; +} + +/* call the custom constructor of the behavior during its initialization phase + * and after that all its attributes have been parsed successfully. + */ +static int +seg6_local_lwtunnel_build_state(struct seg6_local_lwt *slwt, const void *cfg, + struct netlink_ext_ack *extack) +{ + struct seg6_action_desc *desc = slwt->desc; + struct seg6_local_lwtunnel_ops *ops; + + ops = &desc->slwt_ops; + if (!ops->build_state) + return 0; + + return ops->build_state(slwt, cfg, extack); +} + +/* call the custom destructor of the behavior which is invoked before the + * tunnel is going to be destroyed. + */ +static void seg6_local_lwtunnel_destroy_state(struct seg6_local_lwt *slwt) +{ + struct seg6_action_desc *desc = slwt->desc; + struct seg6_local_lwtunnel_ops *ops; + + ops = &desc->slwt_ops; + if (!ops->destroy_state) + return; + + ops->destroy_state(slwt); +} + +static int parse_nla_action(struct nlattr **attrs, struct seg6_local_lwt *slwt, + struct netlink_ext_ack *extack) +{ + struct seg6_action_param *param; + struct seg6_action_desc *desc; + unsigned long invalid_attrs; + int i, err; + + desc = __get_action_desc(slwt->action); + if (!desc) + return -EINVAL; + + if (!desc->input) + return -EOPNOTSUPP; + + slwt->desc = desc; + slwt->headroom += desc->static_headroom; + + /* Forcing the desc->optattrs *set* and the desc->attrs *set* to be + * disjoined, this allow us to release acquired resources by optional + * attributes and by required attributes independently from each other + * without any interference. + * In other terms, we are sure that we do not release some the acquired + * resources twice. + * + * Note that if an attribute is configured both as required and as + * optional, it means that the user has messed something up in the + * seg6_action_table. Therefore, this check is required for SRv6 + * behaviors to work properly. + */ + invalid_attrs = desc->attrs & desc->optattrs; + if (invalid_attrs) { + WARN_ONCE(1, + "An attribute cannot be both required AND optional"); + return -EINVAL; + } + + /* parse the required attributes */ + for (i = SEG6_LOCAL_SRH; i < SEG6_LOCAL_MAX + 1; i++) { + if (desc->attrs & SEG6_F_ATTR(i)) { + if (!attrs[i]) + return -EINVAL; + + param = &seg6_action_params[i]; + + err = param->parse(attrs, slwt, extack); + if (err < 0) + goto parse_attrs_err; + } + } + + /* parse the optional attributes, if any */ + err = parse_nla_optional_attrs(attrs, slwt, extack); + if (err < 0) + goto parse_attrs_err; + + return 0; + +parse_attrs_err: + /* release any resource that may have been acquired during the i-1 + * parse() operations. + */ + __destroy_attrs(desc->attrs, i, slwt); + + return err; +} + +static int seg6_local_build_state(struct net *net, struct nlattr *nla, + unsigned int family, const void *cfg, + struct lwtunnel_state **ts, + struct netlink_ext_ack *extack) +{ + struct nlattr *tb[SEG6_LOCAL_MAX + 1]; + struct lwtunnel_state *newts; + struct seg6_local_lwt *slwt; + int err; + + if (family != AF_INET6) + return -EINVAL; + + err = nla_parse_nested_deprecated(tb, SEG6_LOCAL_MAX, nla, + seg6_local_policy, extack); + + if (err < 0) + return err; + + if (!tb[SEG6_LOCAL_ACTION]) + return -EINVAL; + + newts = lwtunnel_state_alloc(sizeof(*slwt)); + if (!newts) + return -ENOMEM; + + slwt = seg6_local_lwtunnel(newts); + slwt->action = nla_get_u32(tb[SEG6_LOCAL_ACTION]); + + err = parse_nla_action(tb, slwt, extack); + if (err < 0) + goto out_free; + + err = seg6_local_lwtunnel_build_state(slwt, cfg, extack); + if (err < 0) + goto out_destroy_attrs; + + newts->type = LWTUNNEL_ENCAP_SEG6_LOCAL; + newts->flags = LWTUNNEL_STATE_INPUT_REDIRECT; + newts->headroom = slwt->headroom; + + *ts = newts; + + return 0; + +out_destroy_attrs: + destroy_attrs(slwt); +out_free: + kfree(newts); + return err; +} + +static void seg6_local_destroy_state(struct lwtunnel_state *lwt) +{ + struct seg6_local_lwt *slwt = seg6_local_lwtunnel(lwt); + + seg6_local_lwtunnel_destroy_state(slwt); + + destroy_attrs(slwt); + + return; +} + +static int seg6_local_fill_encap(struct sk_buff *skb, + struct lwtunnel_state *lwt) +{ + struct seg6_local_lwt *slwt = seg6_local_lwtunnel(lwt); + struct seg6_action_param *param; + unsigned long attrs; + int i, err; + + if (nla_put_u32(skb, SEG6_LOCAL_ACTION, slwt->action)) + return -EMSGSIZE; + + attrs = slwt->desc->attrs | slwt->parsed_optattrs; + + for (i = SEG6_LOCAL_SRH; i < SEG6_LOCAL_MAX + 1; i++) { + if (attrs & SEG6_F_ATTR(i)) { + param = &seg6_action_params[i]; + err = param->put(skb, slwt); + if (err < 0) + return err; + } + } + + return 0; +} + +static int seg6_local_get_encap_size(struct lwtunnel_state *lwt) +{ + struct seg6_local_lwt *slwt = seg6_local_lwtunnel(lwt); + unsigned long attrs; + int nlsize; + + nlsize = nla_total_size(4); /* action */ + + attrs = slwt->desc->attrs | slwt->parsed_optattrs; + + if (attrs & SEG6_F_ATTR(SEG6_LOCAL_SRH)) + nlsize += nla_total_size((slwt->srh->hdrlen + 1) << 3); + + if (attrs & SEG6_F_ATTR(SEG6_LOCAL_TABLE)) + nlsize += nla_total_size(4); + + if (attrs & SEG6_F_ATTR(SEG6_LOCAL_NH4)) + nlsize += nla_total_size(4); + + if (attrs & SEG6_F_ATTR(SEG6_LOCAL_NH6)) + nlsize += nla_total_size(16); + + if (attrs & SEG6_F_ATTR(SEG6_LOCAL_IIF)) + nlsize += nla_total_size(4); + + if (attrs & SEG6_F_ATTR(SEG6_LOCAL_OIF)) + nlsize += nla_total_size(4); + + if (attrs & SEG6_F_ATTR(SEG6_LOCAL_BPF)) + nlsize += nla_total_size(sizeof(struct nlattr)) + + nla_total_size(MAX_PROG_NAME) + + nla_total_size(4); + + if (attrs & SEG6_F_ATTR(SEG6_LOCAL_VRFTABLE)) + nlsize += nla_total_size(4); + + if (attrs & SEG6_F_LOCAL_COUNTERS) + nlsize += nla_total_size(0) + /* nest SEG6_LOCAL_COUNTERS */ + /* SEG6_LOCAL_CNT_PACKETS */ + nla_total_size_64bit(sizeof(__u64)) + + /* SEG6_LOCAL_CNT_BYTES */ + nla_total_size_64bit(sizeof(__u64)) + + /* SEG6_LOCAL_CNT_ERRORS */ + nla_total_size_64bit(sizeof(__u64)); + + if (attrs & SEG6_F_ATTR(SEG6_LOCAL_FLAVORS)) + nlsize += encap_size_flavors(slwt); + + return nlsize; +} + +static int seg6_local_cmp_encap(struct lwtunnel_state *a, + struct lwtunnel_state *b) +{ + struct seg6_local_lwt *slwt_a, *slwt_b; + struct seg6_action_param *param; + unsigned long attrs_a, attrs_b; + int i; + + slwt_a = seg6_local_lwtunnel(a); + slwt_b = seg6_local_lwtunnel(b); + + if (slwt_a->action != slwt_b->action) + return 1; + + attrs_a = slwt_a->desc->attrs | slwt_a->parsed_optattrs; + attrs_b = slwt_b->desc->attrs | slwt_b->parsed_optattrs; + + if (attrs_a != attrs_b) + return 1; + + for (i = SEG6_LOCAL_SRH; i < SEG6_LOCAL_MAX + 1; i++) { + if (attrs_a & SEG6_F_ATTR(i)) { + param = &seg6_action_params[i]; + if (param->cmp(slwt_a, slwt_b)) + return 1; + } + } + + return 0; +} + +static const struct lwtunnel_encap_ops seg6_local_ops = { + .build_state = seg6_local_build_state, + .destroy_state = seg6_local_destroy_state, + .input = seg6_local_input, + .fill_encap = seg6_local_fill_encap, + .get_encap_size = seg6_local_get_encap_size, + .cmp_encap = seg6_local_cmp_encap, + .owner = THIS_MODULE, +}; + +int __init seg6_local_init(void) +{ + /* If the max total number of defined attributes is reached, then your + * kernel build stops here. + * + * This check is required to avoid arithmetic overflows when processing + * behavior attributes and the maximum number of defined attributes + * exceeds the allowed value. + */ + BUILD_BUG_ON(SEG6_LOCAL_MAX + 1 > BITS_PER_TYPE(unsigned long)); + + /* If the default NEXT-C-SID Locator-Block/Node Function lengths (in + * bits) have been changed with invalid values, kernel build stops + * here. + */ + BUILD_BUG_ON(next_csid_chk_cntr_bits(SEG6_LOCAL_LCBLOCK_DBITS, + SEG6_LOCAL_LCNODE_FN_DBITS)); + BUILD_BUG_ON(next_csid_chk_lcblock_bits(SEG6_LOCAL_LCBLOCK_DBITS)); + BUILD_BUG_ON(next_csid_chk_lcnode_fn_bits(SEG6_LOCAL_LCNODE_FN_DBITS)); + + return lwtunnel_encap_add_ops(&seg6_local_ops, + LWTUNNEL_ENCAP_SEG6_LOCAL); +} + +void seg6_local_exit(void) +{ + lwtunnel_encap_del_ops(&seg6_local_ops, LWTUNNEL_ENCAP_SEG6_LOCAL); +} |