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