636 строки
16 KiB
C
636 строки
16 KiB
C
/*
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* Copyright (c) 2016, Amir Vadai <amir@vadai.me>
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* Copyright (c) 2016, Mellanox Technologies. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/skbuff.h>
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#include <linux/rtnetlink.h>
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#include <net/geneve.h>
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#include <net/netlink.h>
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#include <net/pkt_sched.h>
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#include <net/dst.h>
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#include <net/pkt_cls.h>
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#include <linux/tc_act/tc_tunnel_key.h>
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#include <net/tc_act/tc_tunnel_key.h>
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static unsigned int tunnel_key_net_id;
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static struct tc_action_ops act_tunnel_key_ops;
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static int tunnel_key_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_tunnel_key *t = to_tunnel_key(a);
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struct tcf_tunnel_key_params *params;
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int action;
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params = rcu_dereference_bh(t->params);
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tcf_lastuse_update(&t->tcf_tm);
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bstats_cpu_update(this_cpu_ptr(t->common.cpu_bstats), skb);
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action = READ_ONCE(t->tcf_action);
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switch (params->tcft_action) {
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case TCA_TUNNEL_KEY_ACT_RELEASE:
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skb_dst_drop(skb);
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break;
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case TCA_TUNNEL_KEY_ACT_SET:
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skb_dst_drop(skb);
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skb_dst_set(skb, dst_clone(¶ms->tcft_enc_metadata->dst));
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break;
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default:
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WARN_ONCE(1, "Bad tunnel_key action %d.\n",
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params->tcft_action);
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break;
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}
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return action;
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}
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static const struct nla_policy
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enc_opts_policy[TCA_TUNNEL_KEY_ENC_OPTS_MAX + 1] = {
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[TCA_TUNNEL_KEY_ENC_OPTS_GENEVE] = { .type = NLA_NESTED },
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};
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static const struct nla_policy
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geneve_opt_policy[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_MAX + 1] = {
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[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_CLASS] = { .type = NLA_U16 },
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[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_TYPE] = { .type = NLA_U8 },
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[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA] = { .type = NLA_BINARY,
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.len = 128 },
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};
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static int
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tunnel_key_copy_geneve_opt(const struct nlattr *nla, void *dst, int dst_len,
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struct netlink_ext_ack *extack)
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{
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struct nlattr *tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_MAX + 1];
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int err, data_len, opt_len;
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u8 *data;
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err = nla_parse_nested_deprecated(tb,
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TCA_TUNNEL_KEY_ENC_OPT_GENEVE_MAX,
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nla, geneve_opt_policy, extack);
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if (err < 0)
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return err;
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if (!tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_CLASS] ||
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!tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_TYPE] ||
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!tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA]) {
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NL_SET_ERR_MSG(extack, "Missing tunnel key geneve option class, type or data");
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return -EINVAL;
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}
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data = nla_data(tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA]);
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data_len = nla_len(tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA]);
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if (data_len < 4) {
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NL_SET_ERR_MSG(extack, "Tunnel key geneve option data is less than 4 bytes long");
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return -ERANGE;
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}
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if (data_len % 4) {
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NL_SET_ERR_MSG(extack, "Tunnel key geneve option data is not a multiple of 4 bytes long");
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return -ERANGE;
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}
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opt_len = sizeof(struct geneve_opt) + data_len;
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if (dst) {
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struct geneve_opt *opt = dst;
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WARN_ON(dst_len < opt_len);
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opt->opt_class =
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nla_get_be16(tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_CLASS]);
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opt->type = nla_get_u8(tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_TYPE]);
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opt->length = data_len / 4; /* length is in units of 4 bytes */
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opt->r1 = 0;
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opt->r2 = 0;
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opt->r3 = 0;
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memcpy(opt + 1, data, data_len);
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}
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return opt_len;
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}
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static int tunnel_key_copy_opts(const struct nlattr *nla, u8 *dst,
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int dst_len, struct netlink_ext_ack *extack)
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{
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int err, rem, opt_len, len = nla_len(nla), opts_len = 0;
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const struct nlattr *attr, *head = nla_data(nla);
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err = nla_validate_deprecated(head, len, TCA_TUNNEL_KEY_ENC_OPTS_MAX,
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enc_opts_policy, extack);
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if (err)
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return err;
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nla_for_each_attr(attr, head, len, rem) {
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switch (nla_type(attr)) {
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case TCA_TUNNEL_KEY_ENC_OPTS_GENEVE:
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opt_len = tunnel_key_copy_geneve_opt(attr, dst,
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dst_len, extack);
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if (opt_len < 0)
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return opt_len;
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opts_len += opt_len;
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if (dst) {
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dst_len -= opt_len;
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dst += opt_len;
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}
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break;
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}
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}
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if (!opts_len) {
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NL_SET_ERR_MSG(extack, "Empty list of tunnel options");
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return -EINVAL;
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}
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if (rem > 0) {
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NL_SET_ERR_MSG(extack, "Trailing data after parsing tunnel key options attributes");
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return -EINVAL;
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}
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return opts_len;
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}
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static int tunnel_key_get_opts_len(struct nlattr *nla,
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struct netlink_ext_ack *extack)
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{
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return tunnel_key_copy_opts(nla, NULL, 0, extack);
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}
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static int tunnel_key_opts_set(struct nlattr *nla, struct ip_tunnel_info *info,
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int opts_len, struct netlink_ext_ack *extack)
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{
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info->options_len = opts_len;
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switch (nla_type(nla_data(nla))) {
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case TCA_TUNNEL_KEY_ENC_OPTS_GENEVE:
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#if IS_ENABLED(CONFIG_INET)
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info->key.tun_flags |= TUNNEL_GENEVE_OPT;
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return tunnel_key_copy_opts(nla, ip_tunnel_info_opts(info),
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opts_len, extack);
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#else
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return -EAFNOSUPPORT;
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#endif
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default:
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NL_SET_ERR_MSG(extack, "Cannot set tunnel options for unknown tunnel type");
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return -EINVAL;
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}
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}
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static const struct nla_policy tunnel_key_policy[TCA_TUNNEL_KEY_MAX + 1] = {
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[TCA_TUNNEL_KEY_PARMS] = { .len = sizeof(struct tc_tunnel_key) },
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[TCA_TUNNEL_KEY_ENC_IPV4_SRC] = { .type = NLA_U32 },
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[TCA_TUNNEL_KEY_ENC_IPV4_DST] = { .type = NLA_U32 },
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[TCA_TUNNEL_KEY_ENC_IPV6_SRC] = { .len = sizeof(struct in6_addr) },
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[TCA_TUNNEL_KEY_ENC_IPV6_DST] = { .len = sizeof(struct in6_addr) },
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[TCA_TUNNEL_KEY_ENC_KEY_ID] = { .type = NLA_U32 },
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[TCA_TUNNEL_KEY_ENC_DST_PORT] = {.type = NLA_U16},
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[TCA_TUNNEL_KEY_NO_CSUM] = { .type = NLA_U8 },
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[TCA_TUNNEL_KEY_ENC_OPTS] = { .type = NLA_NESTED },
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[TCA_TUNNEL_KEY_ENC_TOS] = { .type = NLA_U8 },
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[TCA_TUNNEL_KEY_ENC_TTL] = { .type = NLA_U8 },
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};
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static void tunnel_key_release_params(struct tcf_tunnel_key_params *p)
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{
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if (!p)
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return;
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if (p->tcft_action == TCA_TUNNEL_KEY_ACT_SET)
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dst_release(&p->tcft_enc_metadata->dst);
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kfree_rcu(p, rcu);
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}
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static int tunnel_key_init(struct net *net, struct nlattr *nla,
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struct nlattr *est, struct tc_action **a,
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int ovr, int bind, bool rtnl_held,
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struct tcf_proto *tp,
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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, tunnel_key_net_id);
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struct nlattr *tb[TCA_TUNNEL_KEY_MAX + 1];
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struct tcf_tunnel_key_params *params_new;
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struct metadata_dst *metadata = NULL;
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struct tcf_chain *goto_ch = NULL;
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struct tc_tunnel_key *parm;
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struct tcf_tunnel_key *t;
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bool exists = false;
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__be16 dst_port = 0;
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__be64 key_id = 0;
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int opts_len = 0;
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__be16 flags = 0;
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u8 tos, ttl;
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int ret = 0;
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int err;
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if (!nla) {
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NL_SET_ERR_MSG(extack, "Tunnel requires attributes to be passed");
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return -EINVAL;
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}
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err = nla_parse_nested_deprecated(tb, TCA_TUNNEL_KEY_MAX, nla,
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tunnel_key_policy, extack);
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if (err < 0) {
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NL_SET_ERR_MSG(extack, "Failed to parse nested tunnel key attributes");
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return err;
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}
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if (!tb[TCA_TUNNEL_KEY_PARMS]) {
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NL_SET_ERR_MSG(extack, "Missing tunnel key parameters");
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return -EINVAL;
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}
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parm = nla_data(tb[TCA_TUNNEL_KEY_PARMS]);
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err = tcf_idr_check_alloc(tn, &parm->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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switch (parm->t_action) {
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case TCA_TUNNEL_KEY_ACT_RELEASE:
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break;
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case TCA_TUNNEL_KEY_ACT_SET:
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if (tb[TCA_TUNNEL_KEY_ENC_KEY_ID]) {
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__be32 key32;
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key32 = nla_get_be32(tb[TCA_TUNNEL_KEY_ENC_KEY_ID]);
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key_id = key32_to_tunnel_id(key32);
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flags = TUNNEL_KEY;
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}
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flags |= TUNNEL_CSUM;
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if (tb[TCA_TUNNEL_KEY_NO_CSUM] &&
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nla_get_u8(tb[TCA_TUNNEL_KEY_NO_CSUM]))
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flags &= ~TUNNEL_CSUM;
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if (tb[TCA_TUNNEL_KEY_ENC_DST_PORT])
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dst_port = nla_get_be16(tb[TCA_TUNNEL_KEY_ENC_DST_PORT]);
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if (tb[TCA_TUNNEL_KEY_ENC_OPTS]) {
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opts_len = tunnel_key_get_opts_len(tb[TCA_TUNNEL_KEY_ENC_OPTS],
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extack);
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if (opts_len < 0) {
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ret = opts_len;
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goto err_out;
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}
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}
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tos = 0;
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if (tb[TCA_TUNNEL_KEY_ENC_TOS])
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tos = nla_get_u8(tb[TCA_TUNNEL_KEY_ENC_TOS]);
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ttl = 0;
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if (tb[TCA_TUNNEL_KEY_ENC_TTL])
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ttl = nla_get_u8(tb[TCA_TUNNEL_KEY_ENC_TTL]);
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if (tb[TCA_TUNNEL_KEY_ENC_IPV4_SRC] &&
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tb[TCA_TUNNEL_KEY_ENC_IPV4_DST]) {
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__be32 saddr;
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__be32 daddr;
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saddr = nla_get_in_addr(tb[TCA_TUNNEL_KEY_ENC_IPV4_SRC]);
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daddr = nla_get_in_addr(tb[TCA_TUNNEL_KEY_ENC_IPV4_DST]);
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metadata = __ip_tun_set_dst(saddr, daddr, tos, ttl,
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dst_port, flags,
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key_id, opts_len);
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} else if (tb[TCA_TUNNEL_KEY_ENC_IPV6_SRC] &&
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tb[TCA_TUNNEL_KEY_ENC_IPV6_DST]) {
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struct in6_addr saddr;
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struct in6_addr daddr;
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saddr = nla_get_in6_addr(tb[TCA_TUNNEL_KEY_ENC_IPV6_SRC]);
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daddr = nla_get_in6_addr(tb[TCA_TUNNEL_KEY_ENC_IPV6_DST]);
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metadata = __ipv6_tun_set_dst(&saddr, &daddr, tos, ttl, dst_port,
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0, flags,
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key_id, 0);
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} else {
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NL_SET_ERR_MSG(extack, "Missing either ipv4 or ipv6 src and dst");
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ret = -EINVAL;
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goto err_out;
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}
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if (!metadata) {
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NL_SET_ERR_MSG(extack, "Cannot allocate tunnel metadata dst");
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ret = -ENOMEM;
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goto err_out;
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}
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#ifdef CONFIG_DST_CACHE
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ret = dst_cache_init(&metadata->u.tun_info.dst_cache, GFP_KERNEL);
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if (ret)
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goto release_tun_meta;
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#endif
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if (opts_len) {
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ret = tunnel_key_opts_set(tb[TCA_TUNNEL_KEY_ENC_OPTS],
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&metadata->u.tun_info,
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opts_len, extack);
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if (ret < 0)
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goto release_tun_meta;
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}
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metadata->u.tun_info.mode |= IP_TUNNEL_INFO_TX;
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break;
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default:
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NL_SET_ERR_MSG(extack, "Unknown tunnel key action");
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ret = -EINVAL;
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goto err_out;
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}
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if (!exists) {
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ret = tcf_idr_create(tn, parm->index, est, a,
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&act_tunnel_key_ops, bind, true);
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if (ret) {
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NL_SET_ERR_MSG(extack, "Cannot create TC IDR");
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goto release_tun_meta;
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}
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ret = ACT_P_CREATED;
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} else if (!ovr) {
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NL_SET_ERR_MSG(extack, "TC IDR already exists");
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ret = -EEXIST;
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goto release_tun_meta;
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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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ret = err;
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exists = true;
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goto release_tun_meta;
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}
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t = to_tunnel_key(*a);
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params_new = kzalloc(sizeof(*params_new), GFP_KERNEL);
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if (unlikely(!params_new)) {
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NL_SET_ERR_MSG(extack, "Cannot allocate tunnel key parameters");
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ret = -ENOMEM;
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exists = true;
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goto put_chain;
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}
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params_new->tcft_action = parm->t_action;
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params_new->tcft_enc_metadata = metadata;
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spin_lock_bh(&t->tcf_lock);
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goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
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rcu_swap_protected(t->params, params_new,
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lockdep_is_held(&t->tcf_lock));
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spin_unlock_bh(&t->tcf_lock);
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tunnel_key_release_params(params_new);
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if (goto_ch)
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tcf_chain_put_by_act(goto_ch);
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if (ret == ACT_P_CREATED)
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tcf_idr_insert(tn, *a);
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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_tun_meta:
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if (metadata)
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dst_release(&metadata->dst);
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err_out:
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if (exists)
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tcf_idr_release(*a, bind);
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else
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tcf_idr_cleanup(tn, parm->index);
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return ret;
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}
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static void tunnel_key_release(struct tc_action *a)
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{
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struct tcf_tunnel_key *t = to_tunnel_key(a);
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struct tcf_tunnel_key_params *params;
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params = rcu_dereference_protected(t->params, 1);
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tunnel_key_release_params(params);
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}
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static int tunnel_key_geneve_opts_dump(struct sk_buff *skb,
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const struct ip_tunnel_info *info)
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{
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int len = info->options_len;
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u8 *src = (u8 *)(info + 1);
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struct nlattr *start;
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start = nla_nest_start_noflag(skb, TCA_TUNNEL_KEY_ENC_OPTS_GENEVE);
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if (!start)
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return -EMSGSIZE;
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while (len > 0) {
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struct geneve_opt *opt = (struct geneve_opt *)src;
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if (nla_put_be16(skb, TCA_TUNNEL_KEY_ENC_OPT_GENEVE_CLASS,
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opt->opt_class) ||
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nla_put_u8(skb, TCA_TUNNEL_KEY_ENC_OPT_GENEVE_TYPE,
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opt->type) ||
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nla_put(skb, TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA,
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opt->length * 4, opt + 1)) {
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nla_nest_cancel(skb, start);
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return -EMSGSIZE;
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}
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len -= sizeof(struct geneve_opt) + opt->length * 4;
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src += sizeof(struct geneve_opt) + opt->length * 4;
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}
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nla_nest_end(skb, start);
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return 0;
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}
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static int tunnel_key_opts_dump(struct sk_buff *skb,
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const struct ip_tunnel_info *info)
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{
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struct nlattr *start;
|
|
int err = -EINVAL;
|
|
|
|
if (!info->options_len)
|
|
return 0;
|
|
|
|
start = nla_nest_start_noflag(skb, TCA_TUNNEL_KEY_ENC_OPTS);
|
|
if (!start)
|
|
return -EMSGSIZE;
|
|
|
|
if (info->key.tun_flags & TUNNEL_GENEVE_OPT) {
|
|
err = tunnel_key_geneve_opts_dump(skb, info);
|
|
if (err)
|
|
goto err_out;
|
|
} else {
|
|
err_out:
|
|
nla_nest_cancel(skb, start);
|
|
return err;
|
|
}
|
|
|
|
nla_nest_end(skb, start);
|
|
return 0;
|
|
}
|
|
|
|
static int tunnel_key_dump_addresses(struct sk_buff *skb,
|
|
const struct ip_tunnel_info *info)
|
|
{
|
|
unsigned short family = ip_tunnel_info_af(info);
|
|
|
|
if (family == AF_INET) {
|
|
__be32 saddr = info->key.u.ipv4.src;
|
|
__be32 daddr = info->key.u.ipv4.dst;
|
|
|
|
if (!nla_put_in_addr(skb, TCA_TUNNEL_KEY_ENC_IPV4_SRC, saddr) &&
|
|
!nla_put_in_addr(skb, TCA_TUNNEL_KEY_ENC_IPV4_DST, daddr))
|
|
return 0;
|
|
}
|
|
|
|
if (family == AF_INET6) {
|
|
const struct in6_addr *saddr6 = &info->key.u.ipv6.src;
|
|
const struct in6_addr *daddr6 = &info->key.u.ipv6.dst;
|
|
|
|
if (!nla_put_in6_addr(skb,
|
|
TCA_TUNNEL_KEY_ENC_IPV6_SRC, saddr6) &&
|
|
!nla_put_in6_addr(skb,
|
|
TCA_TUNNEL_KEY_ENC_IPV6_DST, daddr6))
|
|
return 0;
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int tunnel_key_dump(struct sk_buff *skb, struct tc_action *a,
|
|
int bind, int ref)
|
|
{
|
|
unsigned char *b = skb_tail_pointer(skb);
|
|
struct tcf_tunnel_key *t = to_tunnel_key(a);
|
|
struct tcf_tunnel_key_params *params;
|
|
struct tc_tunnel_key opt = {
|
|
.index = t->tcf_index,
|
|
.refcnt = refcount_read(&t->tcf_refcnt) - ref,
|
|
.bindcnt = atomic_read(&t->tcf_bindcnt) - bind,
|
|
};
|
|
struct tcf_t tm;
|
|
|
|
spin_lock_bh(&t->tcf_lock);
|
|
params = rcu_dereference_protected(t->params,
|
|
lockdep_is_held(&t->tcf_lock));
|
|
opt.action = t->tcf_action;
|
|
opt.t_action = params->tcft_action;
|
|
|
|
if (nla_put(skb, TCA_TUNNEL_KEY_PARMS, sizeof(opt), &opt))
|
|
goto nla_put_failure;
|
|
|
|
if (params->tcft_action == TCA_TUNNEL_KEY_ACT_SET) {
|
|
struct ip_tunnel_info *info =
|
|
¶ms->tcft_enc_metadata->u.tun_info;
|
|
struct ip_tunnel_key *key = &info->key;
|
|
__be32 key_id = tunnel_id_to_key32(key->tun_id);
|
|
|
|
if (((key->tun_flags & TUNNEL_KEY) &&
|
|
nla_put_be32(skb, TCA_TUNNEL_KEY_ENC_KEY_ID, key_id)) ||
|
|
tunnel_key_dump_addresses(skb,
|
|
¶ms->tcft_enc_metadata->u.tun_info) ||
|
|
(key->tp_dst &&
|
|
nla_put_be16(skb, TCA_TUNNEL_KEY_ENC_DST_PORT,
|
|
key->tp_dst)) ||
|
|
nla_put_u8(skb, TCA_TUNNEL_KEY_NO_CSUM,
|
|
!(key->tun_flags & TUNNEL_CSUM)) ||
|
|
tunnel_key_opts_dump(skb, info))
|
|
goto nla_put_failure;
|
|
|
|
if (key->tos && nla_put_u8(skb, TCA_TUNNEL_KEY_ENC_TOS, key->tos))
|
|
goto nla_put_failure;
|
|
|
|
if (key->ttl && nla_put_u8(skb, TCA_TUNNEL_KEY_ENC_TTL, key->ttl))
|
|
goto nla_put_failure;
|
|
}
|
|
|
|
tcf_tm_dump(&tm, &t->tcf_tm);
|
|
if (nla_put_64bit(skb, TCA_TUNNEL_KEY_TM, sizeof(tm),
|
|
&tm, TCA_TUNNEL_KEY_PAD))
|
|
goto nla_put_failure;
|
|
spin_unlock_bh(&t->tcf_lock);
|
|
|
|
return skb->len;
|
|
|
|
nla_put_failure:
|
|
spin_unlock_bh(&t->tcf_lock);
|
|
nlmsg_trim(skb, b);
|
|
return -1;
|
|
}
|
|
|
|
static int tunnel_key_walker(struct net *net, struct sk_buff *skb,
|
|
struct netlink_callback *cb, int type,
|
|
const struct tc_action_ops *ops,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
|
|
|
|
return tcf_generic_walker(tn, skb, cb, type, ops, extack);
|
|
}
|
|
|
|
static int tunnel_key_search(struct net *net, struct tc_action **a, u32 index)
|
|
{
|
|
struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
|
|
|
|
return tcf_idr_search(tn, a, index);
|
|
}
|
|
|
|
static struct tc_action_ops act_tunnel_key_ops = {
|
|
.kind = "tunnel_key",
|
|
.id = TCA_ID_TUNNEL_KEY,
|
|
.owner = THIS_MODULE,
|
|
.act = tunnel_key_act,
|
|
.dump = tunnel_key_dump,
|
|
.init = tunnel_key_init,
|
|
.cleanup = tunnel_key_release,
|
|
.walk = tunnel_key_walker,
|
|
.lookup = tunnel_key_search,
|
|
.size = sizeof(struct tcf_tunnel_key),
|
|
};
|
|
|
|
static __net_init int tunnel_key_init_net(struct net *net)
|
|
{
|
|
struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
|
|
|
|
return tc_action_net_init(tn, &act_tunnel_key_ops);
|
|
}
|
|
|
|
static void __net_exit tunnel_key_exit_net(struct list_head *net_list)
|
|
{
|
|
tc_action_net_exit(net_list, tunnel_key_net_id);
|
|
}
|
|
|
|
static struct pernet_operations tunnel_key_net_ops = {
|
|
.init = tunnel_key_init_net,
|
|
.exit_batch = tunnel_key_exit_net,
|
|
.id = &tunnel_key_net_id,
|
|
.size = sizeof(struct tc_action_net),
|
|
};
|
|
|
|
static int __init tunnel_key_init_module(void)
|
|
{
|
|
return tcf_register_action(&act_tunnel_key_ops, &tunnel_key_net_ops);
|
|
}
|
|
|
|
static void __exit tunnel_key_cleanup_module(void)
|
|
{
|
|
tcf_unregister_action(&act_tunnel_key_ops, &tunnel_key_net_ops);
|
|
}
|
|
|
|
module_init(tunnel_key_init_module);
|
|
module_exit(tunnel_key_cleanup_module);
|
|
|
|
MODULE_AUTHOR("Amir Vadai <amir@vadai.me>");
|
|
MODULE_DESCRIPTION("ip tunnel manipulation actions");
|
|
MODULE_LICENSE("GPL v2");
|