| // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) |
| /* Copyright (C) 2019 Netronome Systems, Inc. */ |
| |
| #include <linux/if_arp.h> |
| #include <linux/init.h> |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/mpls.h> |
| #include <linux/rtnetlink.h> |
| #include <linux/skbuff.h> |
| #include <linux/tc_act/tc_mpls.h> |
| #include <net/mpls.h> |
| #include <net/netlink.h> |
| #include <net/pkt_sched.h> |
| #include <net/pkt_cls.h> |
| #include <net/tc_act/tc_mpls.h> |
| #include <net/tc_wrapper.h> |
| |
| static struct tc_action_ops act_mpls_ops; |
| |
| #define ACT_MPLS_TTL_DEFAULT 255 |
| |
| static __be32 tcf_mpls_get_lse(struct mpls_shim_hdr *lse, |
| struct tcf_mpls_params *p, bool set_bos) |
| { |
| u32 new_lse = 0; |
| |
| if (lse) |
| new_lse = be32_to_cpu(lse->label_stack_entry); |
| |
| if (p->tcfm_label != ACT_MPLS_LABEL_NOT_SET) { |
| new_lse &= ~MPLS_LS_LABEL_MASK; |
| new_lse |= p->tcfm_label << MPLS_LS_LABEL_SHIFT; |
| } |
| if (p->tcfm_ttl) { |
| new_lse &= ~MPLS_LS_TTL_MASK; |
| new_lse |= p->tcfm_ttl << MPLS_LS_TTL_SHIFT; |
| } |
| if (p->tcfm_tc != ACT_MPLS_TC_NOT_SET) { |
| new_lse &= ~MPLS_LS_TC_MASK; |
| new_lse |= p->tcfm_tc << MPLS_LS_TC_SHIFT; |
| } |
| if (p->tcfm_bos != ACT_MPLS_BOS_NOT_SET) { |
| new_lse &= ~MPLS_LS_S_MASK; |
| new_lse |= p->tcfm_bos << MPLS_LS_S_SHIFT; |
| } else if (set_bos) { |
| new_lse |= 1 << MPLS_LS_S_SHIFT; |
| } |
| |
| return cpu_to_be32(new_lse); |
| } |
| |
| TC_INDIRECT_SCOPE int tcf_mpls_act(struct sk_buff *skb, |
| const struct tc_action *a, |
| struct tcf_result *res) |
| { |
| struct tcf_mpls *m = to_mpls(a); |
| struct tcf_mpls_params *p; |
| __be32 new_lse; |
| int ret, mac_len; |
| |
| tcf_lastuse_update(&m->tcf_tm); |
| bstats_update(this_cpu_ptr(m->common.cpu_bstats), skb); |
| |
| /* Ensure 'data' points at mac_header prior calling mpls manipulating |
| * functions. |
| */ |
| if (skb_at_tc_ingress(skb)) { |
| skb_push_rcsum(skb, skb->mac_len); |
| mac_len = skb->mac_len; |
| } else { |
| mac_len = skb_network_header(skb) - skb_mac_header(skb); |
| } |
| |
| ret = READ_ONCE(m->tcf_action); |
| |
| p = rcu_dereference_bh(m->mpls_p); |
| |
| switch (p->tcfm_action) { |
| case TCA_MPLS_ACT_POP: |
| if (skb_mpls_pop(skb, p->tcfm_proto, mac_len, |
| skb->dev && skb->dev->type == ARPHRD_ETHER)) |
| goto drop; |
| break; |
| case TCA_MPLS_ACT_PUSH: |
| new_lse = tcf_mpls_get_lse(NULL, p, !eth_p_mpls(skb_protocol(skb, true))); |
| if (skb_mpls_push(skb, new_lse, p->tcfm_proto, mac_len, |
| skb->dev && skb->dev->type == ARPHRD_ETHER)) |
| goto drop; |
| break; |
| case TCA_MPLS_ACT_MAC_PUSH: |
| if (skb_vlan_tag_present(skb)) { |
| if (__vlan_insert_inner_tag(skb, skb->vlan_proto, |
| skb_vlan_tag_get(skb), |
| ETH_HLEN) < 0) |
| goto drop; |
| |
| skb->protocol = skb->vlan_proto; |
| __vlan_hwaccel_clear_tag(skb); |
| } |
| |
| new_lse = tcf_mpls_get_lse(NULL, p, mac_len || |
| !eth_p_mpls(skb->protocol)); |
| |
| if (skb_mpls_push(skb, new_lse, p->tcfm_proto, 0, false)) |
| goto drop; |
| break; |
| case TCA_MPLS_ACT_MODIFY: |
| if (!pskb_may_pull(skb, |
| skb_network_offset(skb) + MPLS_HLEN)) |
| goto drop; |
| new_lse = tcf_mpls_get_lse(mpls_hdr(skb), p, false); |
| if (skb_mpls_update_lse(skb, new_lse)) |
| goto drop; |
| break; |
| case TCA_MPLS_ACT_DEC_TTL: |
| if (skb_mpls_dec_ttl(skb)) |
| goto drop; |
| break; |
| } |
| |
| if (skb_at_tc_ingress(skb)) |
| skb_pull_rcsum(skb, skb->mac_len); |
| |
| return ret; |
| |
| drop: |
| qstats_drop_inc(this_cpu_ptr(m->common.cpu_qstats)); |
| return TC_ACT_SHOT; |
| } |
| |
| static int valid_label(const struct nlattr *attr, |
| struct netlink_ext_ack *extack) |
| { |
| const u32 *label = nla_data(attr); |
| |
| if (*label & ~MPLS_LABEL_MASK || *label == MPLS_LABEL_IMPLNULL) { |
| NL_SET_ERR_MSG_MOD(extack, "MPLS label out of range"); |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static const struct nla_policy mpls_policy[TCA_MPLS_MAX + 1] = { |
| [TCA_MPLS_PARMS] = NLA_POLICY_EXACT_LEN(sizeof(struct tc_mpls)), |
| [TCA_MPLS_PROTO] = { .type = NLA_U16 }, |
| [TCA_MPLS_LABEL] = NLA_POLICY_VALIDATE_FN(NLA_U32, valid_label), |
| [TCA_MPLS_TC] = NLA_POLICY_RANGE(NLA_U8, 0, 7), |
| [TCA_MPLS_TTL] = NLA_POLICY_MIN(NLA_U8, 1), |
| [TCA_MPLS_BOS] = NLA_POLICY_RANGE(NLA_U8, 0, 1), |
| }; |
| |
| static int tcf_mpls_init(struct net *net, struct nlattr *nla, |
| struct nlattr *est, struct tc_action **a, |
| struct tcf_proto *tp, u32 flags, |
| struct netlink_ext_ack *extack) |
| { |
| struct tc_action_net *tn = net_generic(net, act_mpls_ops.net_id); |
| bool bind = flags & TCA_ACT_FLAGS_BIND; |
| struct nlattr *tb[TCA_MPLS_MAX + 1]; |
| struct tcf_chain *goto_ch = NULL; |
| struct tcf_mpls_params *p; |
| struct tc_mpls *parm; |
| bool exists = false; |
| struct tcf_mpls *m; |
| int ret = 0, err; |
| u8 mpls_ttl = 0; |
| u32 index; |
| |
| if (!nla) { |
| NL_SET_ERR_MSG_MOD(extack, "Missing netlink attributes"); |
| return -EINVAL; |
| } |
| |
| err = nla_parse_nested(tb, TCA_MPLS_MAX, nla, mpls_policy, extack); |
| if (err < 0) |
| return err; |
| |
| if (!tb[TCA_MPLS_PARMS]) { |
| NL_SET_ERR_MSG_MOD(extack, "No MPLS params"); |
| return -EINVAL; |
| } |
| parm = nla_data(tb[TCA_MPLS_PARMS]); |
| index = parm->index; |
| |
| /* Verify parameters against action type. */ |
| switch (parm->m_action) { |
| case TCA_MPLS_ACT_POP: |
| if (!tb[TCA_MPLS_PROTO]) { |
| NL_SET_ERR_MSG_MOD(extack, "Protocol must be set for MPLS pop"); |
| return -EINVAL; |
| } |
| if (!eth_proto_is_802_3(nla_get_be16(tb[TCA_MPLS_PROTO]))) { |
| NL_SET_ERR_MSG_MOD(extack, "Invalid protocol type for MPLS pop"); |
| return -EINVAL; |
| } |
| if (tb[TCA_MPLS_LABEL] || tb[TCA_MPLS_TTL] || tb[TCA_MPLS_TC] || |
| tb[TCA_MPLS_BOS]) { |
| NL_SET_ERR_MSG_MOD(extack, "Label, TTL, TC or BOS cannot be used with MPLS pop"); |
| return -EINVAL; |
| } |
| break; |
| case TCA_MPLS_ACT_DEC_TTL: |
| if (tb[TCA_MPLS_PROTO] || tb[TCA_MPLS_LABEL] || |
| tb[TCA_MPLS_TTL] || tb[TCA_MPLS_TC] || tb[TCA_MPLS_BOS]) { |
| NL_SET_ERR_MSG_MOD(extack, "Label, TTL, TC, BOS or protocol cannot be used with MPLS dec_ttl"); |
| return -EINVAL; |
| } |
| break; |
| case TCA_MPLS_ACT_PUSH: |
| case TCA_MPLS_ACT_MAC_PUSH: |
| if (!tb[TCA_MPLS_LABEL]) { |
| NL_SET_ERR_MSG_MOD(extack, "Label is required for MPLS push"); |
| return -EINVAL; |
| } |
| if (tb[TCA_MPLS_PROTO] && |
| !eth_p_mpls(nla_get_be16(tb[TCA_MPLS_PROTO]))) { |
| NL_SET_ERR_MSG_MOD(extack, "Protocol must be an MPLS type for MPLS push"); |
| return -EPROTONOSUPPORT; |
| } |
| /* Push needs a TTL - if not specified, set a default value. */ |
| if (!tb[TCA_MPLS_TTL]) { |
| #if IS_ENABLED(CONFIG_MPLS) |
| mpls_ttl = net->mpls.default_ttl ? |
| net->mpls.default_ttl : ACT_MPLS_TTL_DEFAULT; |
| #else |
| mpls_ttl = ACT_MPLS_TTL_DEFAULT; |
| #endif |
| } |
| break; |
| case TCA_MPLS_ACT_MODIFY: |
| if (tb[TCA_MPLS_PROTO]) { |
| NL_SET_ERR_MSG_MOD(extack, "Protocol cannot be used with MPLS modify"); |
| return -EINVAL; |
| } |
| break; |
| default: |
| NL_SET_ERR_MSG_MOD(extack, "Unknown MPLS action"); |
| return -EINVAL; |
| } |
| |
| err = tcf_idr_check_alloc(tn, &index, a, bind); |
| if (err < 0) |
| return err; |
| exists = err; |
| if (exists && bind) |
| return 0; |
| |
| if (!exists) { |
| ret = tcf_idr_create(tn, index, est, a, |
| &act_mpls_ops, bind, true, flags); |
| if (ret) { |
| tcf_idr_cleanup(tn, index); |
| return ret; |
| } |
| |
| ret = ACT_P_CREATED; |
| } else if (!(flags & TCA_ACT_FLAGS_REPLACE)) { |
| tcf_idr_release(*a, bind); |
| return -EEXIST; |
| } |
| |
| err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack); |
| if (err < 0) |
| goto release_idr; |
| |
| m = to_mpls(*a); |
| |
| p = kzalloc(sizeof(*p), GFP_KERNEL); |
| if (!p) { |
| err = -ENOMEM; |
| goto put_chain; |
| } |
| |
| p->tcfm_action = parm->m_action; |
| p->tcfm_label = tb[TCA_MPLS_LABEL] ? nla_get_u32(tb[TCA_MPLS_LABEL]) : |
| ACT_MPLS_LABEL_NOT_SET; |
| p->tcfm_tc = tb[TCA_MPLS_TC] ? nla_get_u8(tb[TCA_MPLS_TC]) : |
| ACT_MPLS_TC_NOT_SET; |
| p->tcfm_ttl = tb[TCA_MPLS_TTL] ? nla_get_u8(tb[TCA_MPLS_TTL]) : |
| mpls_ttl; |
| p->tcfm_bos = tb[TCA_MPLS_BOS] ? nla_get_u8(tb[TCA_MPLS_BOS]) : |
| ACT_MPLS_BOS_NOT_SET; |
| p->tcfm_proto = tb[TCA_MPLS_PROTO] ? nla_get_be16(tb[TCA_MPLS_PROTO]) : |
| htons(ETH_P_MPLS_UC); |
| |
| spin_lock_bh(&m->tcf_lock); |
| goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch); |
| p = rcu_replace_pointer(m->mpls_p, p, lockdep_is_held(&m->tcf_lock)); |
| spin_unlock_bh(&m->tcf_lock); |
| |
| if (goto_ch) |
| tcf_chain_put_by_act(goto_ch); |
| if (p) |
| kfree_rcu(p, rcu); |
| |
| return ret; |
| put_chain: |
| if (goto_ch) |
| tcf_chain_put_by_act(goto_ch); |
| release_idr: |
| tcf_idr_release(*a, bind); |
| return err; |
| } |
| |
| static void tcf_mpls_cleanup(struct tc_action *a) |
| { |
| struct tcf_mpls *m = to_mpls(a); |
| struct tcf_mpls_params *p; |
| |
| p = rcu_dereference_protected(m->mpls_p, 1); |
| if (p) |
| kfree_rcu(p, rcu); |
| } |
| |
| static int tcf_mpls_dump(struct sk_buff *skb, struct tc_action *a, |
| int bind, int ref) |
| { |
| unsigned char *b = skb_tail_pointer(skb); |
| struct tcf_mpls *m = to_mpls(a); |
| struct tcf_mpls_params *p; |
| struct tc_mpls opt = { |
| .index = m->tcf_index, |
| .refcnt = refcount_read(&m->tcf_refcnt) - ref, |
| .bindcnt = atomic_read(&m->tcf_bindcnt) - bind, |
| }; |
| struct tcf_t t; |
| |
| spin_lock_bh(&m->tcf_lock); |
| opt.action = m->tcf_action; |
| p = rcu_dereference_protected(m->mpls_p, lockdep_is_held(&m->tcf_lock)); |
| opt.m_action = p->tcfm_action; |
| |
| if (nla_put(skb, TCA_MPLS_PARMS, sizeof(opt), &opt)) |
| goto nla_put_failure; |
| |
| if (p->tcfm_label != ACT_MPLS_LABEL_NOT_SET && |
| nla_put_u32(skb, TCA_MPLS_LABEL, p->tcfm_label)) |
| goto nla_put_failure; |
| |
| if (p->tcfm_tc != ACT_MPLS_TC_NOT_SET && |
| nla_put_u8(skb, TCA_MPLS_TC, p->tcfm_tc)) |
| goto nla_put_failure; |
| |
| if (p->tcfm_ttl && nla_put_u8(skb, TCA_MPLS_TTL, p->tcfm_ttl)) |
| goto nla_put_failure; |
| |
| if (p->tcfm_bos != ACT_MPLS_BOS_NOT_SET && |
| nla_put_u8(skb, TCA_MPLS_BOS, p->tcfm_bos)) |
| goto nla_put_failure; |
| |
| if (nla_put_be16(skb, TCA_MPLS_PROTO, p->tcfm_proto)) |
| goto nla_put_failure; |
| |
| tcf_tm_dump(&t, &m->tcf_tm); |
| |
| if (nla_put_64bit(skb, TCA_MPLS_TM, sizeof(t), &t, TCA_MPLS_PAD)) |
| goto nla_put_failure; |
| |
| spin_unlock_bh(&m->tcf_lock); |
| |
| return skb->len; |
| |
| nla_put_failure: |
| spin_unlock_bh(&m->tcf_lock); |
| nlmsg_trim(skb, b); |
| return -EMSGSIZE; |
| } |
| |
| static int tcf_mpls_offload_act_setup(struct tc_action *act, void *entry_data, |
| u32 *index_inc, bool bind, |
| struct netlink_ext_ack *extack) |
| { |
| if (bind) { |
| struct flow_action_entry *entry = entry_data; |
| |
| switch (tcf_mpls_action(act)) { |
| case TCA_MPLS_ACT_PUSH: |
| entry->id = FLOW_ACTION_MPLS_PUSH; |
| entry->mpls_push.proto = tcf_mpls_proto(act); |
| entry->mpls_push.label = tcf_mpls_label(act); |
| entry->mpls_push.tc = tcf_mpls_tc(act); |
| entry->mpls_push.bos = tcf_mpls_bos(act); |
| entry->mpls_push.ttl = tcf_mpls_ttl(act); |
| break; |
| case TCA_MPLS_ACT_POP: |
| entry->id = FLOW_ACTION_MPLS_POP; |
| entry->mpls_pop.proto = tcf_mpls_proto(act); |
| break; |
| case TCA_MPLS_ACT_MODIFY: |
| entry->id = FLOW_ACTION_MPLS_MANGLE; |
| entry->mpls_mangle.label = tcf_mpls_label(act); |
| entry->mpls_mangle.tc = tcf_mpls_tc(act); |
| entry->mpls_mangle.bos = tcf_mpls_bos(act); |
| entry->mpls_mangle.ttl = tcf_mpls_ttl(act); |
| break; |
| case TCA_MPLS_ACT_DEC_TTL: |
| NL_SET_ERR_MSG_MOD(extack, "Offload not supported when \"dec_ttl\" option is used"); |
| return -EOPNOTSUPP; |
| case TCA_MPLS_ACT_MAC_PUSH: |
| NL_SET_ERR_MSG_MOD(extack, "Offload not supported when \"mac_push\" option is used"); |
| return -EOPNOTSUPP; |
| default: |
| NL_SET_ERR_MSG_MOD(extack, "Unsupported MPLS mode offload"); |
| return -EOPNOTSUPP; |
| } |
| *index_inc = 1; |
| } else { |
| struct flow_offload_action *fl_action = entry_data; |
| |
| switch (tcf_mpls_action(act)) { |
| case TCA_MPLS_ACT_PUSH: |
| fl_action->id = FLOW_ACTION_MPLS_PUSH; |
| break; |
| case TCA_MPLS_ACT_POP: |
| fl_action->id = FLOW_ACTION_MPLS_POP; |
| break; |
| case TCA_MPLS_ACT_MODIFY: |
| fl_action->id = FLOW_ACTION_MPLS_MANGLE; |
| break; |
| default: |
| return -EOPNOTSUPP; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static struct tc_action_ops act_mpls_ops = { |
| .kind = "mpls", |
| .id = TCA_ID_MPLS, |
| .owner = THIS_MODULE, |
| .act = tcf_mpls_act, |
| .dump = tcf_mpls_dump, |
| .init = tcf_mpls_init, |
| .cleanup = tcf_mpls_cleanup, |
| .offload_act_setup = tcf_mpls_offload_act_setup, |
| .size = sizeof(struct tcf_mpls), |
| }; |
| |
| static __net_init int mpls_init_net(struct net *net) |
| { |
| struct tc_action_net *tn = net_generic(net, act_mpls_ops.net_id); |
| |
| return tc_action_net_init(net, tn, &act_mpls_ops); |
| } |
| |
| static void __net_exit mpls_exit_net(struct list_head *net_list) |
| { |
| tc_action_net_exit(net_list, act_mpls_ops.net_id); |
| } |
| |
| static struct pernet_operations mpls_net_ops = { |
| .init = mpls_init_net, |
| .exit_batch = mpls_exit_net, |
| .id = &act_mpls_ops.net_id, |
| .size = sizeof(struct tc_action_net), |
| }; |
| |
| static int __init mpls_init_module(void) |
| { |
| return tcf_register_action(&act_mpls_ops, &mpls_net_ops); |
| } |
| |
| static void __exit mpls_cleanup_module(void) |
| { |
| tcf_unregister_action(&act_mpls_ops, &mpls_net_ops); |
| } |
| |
| module_init(mpls_init_module); |
| module_exit(mpls_cleanup_module); |
| |
| MODULE_SOFTDEP("post: mpls_gso"); |
| MODULE_AUTHOR("Netronome Systems <oss-drivers@netronome.com>"); |
| MODULE_LICENSE("GPL"); |
| MODULE_DESCRIPTION("MPLS manipulation actions"); |