351 lines
8.8 KiB
C
351 lines
8.8 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/netlink.h>
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#include <net/pkt_sched.h>
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#include <net/dst.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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#define TUNNEL_KEY_TAB_MASK 15
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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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rcu_read_lock();
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params = rcu_dereference(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 = params->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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rcu_read_unlock();
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return action;
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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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};
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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)
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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_old;
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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 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;
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int ret = 0;
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int err;
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if (!nla)
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return -EINVAL;
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err = nla_parse_nested(tb, TCA_TUNNEL_KEY_MAX, nla, tunnel_key_policy,
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NULL);
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if (err < 0)
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return err;
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if (!tb[TCA_TUNNEL_KEY_PARMS])
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return -EINVAL;
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parm = nla_data(tb[TCA_TUNNEL_KEY_PARMS]);
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exists = tcf_hash_check(tn, parm->index, a, bind);
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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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ret = -EINVAL;
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goto err_out;
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}
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key_id = key32_to_tunnel_id(nla_get_be32(tb[TCA_TUNNEL_KEY_ENC_KEY_ID]));
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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_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, 0, 0,
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dst_port, TUNNEL_KEY,
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key_id, 0);
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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, 0, 0, dst_port,
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0, TUNNEL_KEY,
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key_id, 0);
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}
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if (!metadata) {
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ret = -EINVAL;
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goto err_out;
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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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goto err_out;
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}
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if (!exists) {
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ret = tcf_hash_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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return ret;
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ret = ACT_P_CREATED;
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} else {
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tcf_hash_release(*a, bind);
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if (!ovr)
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return -EEXIST;
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}
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t = to_tunnel_key(*a);
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ASSERT_RTNL();
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params_new = kzalloc(sizeof(*params_new), GFP_KERNEL);
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if (unlikely(!params_new)) {
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if (ret == ACT_P_CREATED)
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tcf_hash_release(*a, bind);
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return -ENOMEM;
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}
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params_old = rtnl_dereference(t->params);
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params_new->action = parm->action;
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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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rcu_assign_pointer(t->params, params_new);
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if (params_old)
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kfree_rcu(params_old, rcu);
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if (ret == ACT_P_CREATED)
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tcf_hash_insert(tn, *a);
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return ret;
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err_out:
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if (exists)
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tcf_hash_release(*a, bind);
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return ret;
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}
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static void tunnel_key_release(struct tc_action *a, int bind)
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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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if (params->tcft_action == TCA_TUNNEL_KEY_ACT_SET)
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dst_release(¶ms->tcft_enc_metadata->dst);
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kfree_rcu(params, rcu);
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}
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static int tunnel_key_dump_addresses(struct sk_buff *skb,
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const struct ip_tunnel_info *info)
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{
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unsigned short family = ip_tunnel_info_af(info);
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if (family == AF_INET) {
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__be32 saddr = info->key.u.ipv4.src;
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__be32 daddr = info->key.u.ipv4.dst;
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if (!nla_put_in_addr(skb, TCA_TUNNEL_KEY_ENC_IPV4_SRC, saddr) &&
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!nla_put_in_addr(skb, TCA_TUNNEL_KEY_ENC_IPV4_DST, daddr))
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return 0;
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}
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if (family == AF_INET6) {
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const struct in6_addr *saddr6 = &info->key.u.ipv6.src;
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const struct in6_addr *daddr6 = &info->key.u.ipv6.dst;
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if (!nla_put_in6_addr(skb,
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TCA_TUNNEL_KEY_ENC_IPV6_SRC, saddr6) &&
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!nla_put_in6_addr(skb,
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TCA_TUNNEL_KEY_ENC_IPV6_DST, daddr6))
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return 0;
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}
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return -EINVAL;
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}
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static int tunnel_key_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_tunnel_key *t = to_tunnel_key(a);
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struct tcf_tunnel_key_params *params;
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struct tc_tunnel_key opt = {
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.index = t->tcf_index,
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.refcnt = t->tcf_refcnt - ref,
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.bindcnt = t->tcf_bindcnt - bind,
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};
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struct tcf_t tm;
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params = rtnl_dereference(t->params);
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opt.t_action = params->tcft_action;
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opt.action = params->action;
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if (nla_put(skb, TCA_TUNNEL_KEY_PARMS, sizeof(opt), &opt))
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goto nla_put_failure;
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if (params->tcft_action == TCA_TUNNEL_KEY_ACT_SET) {
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struct ip_tunnel_key *key =
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¶ms->tcft_enc_metadata->u.tun_info.key;
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__be32 key_id = tunnel_id_to_key32(key->tun_id);
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if (nla_put_be32(skb, TCA_TUNNEL_KEY_ENC_KEY_ID, key_id) ||
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tunnel_key_dump_addresses(skb,
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¶ms->tcft_enc_metadata->u.tun_info) ||
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nla_put_be16(skb, TCA_TUNNEL_KEY_ENC_DST_PORT, key->tp_dst))
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goto nla_put_failure;
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}
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tcf_tm_dump(&tm, &t->tcf_tm);
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if (nla_put_64bit(skb, TCA_TUNNEL_KEY_TM, sizeof(tm),
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&tm, TCA_TUNNEL_KEY_PAD))
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goto nla_put_failure;
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return skb->len;
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nla_put_failure:
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nlmsg_trim(skb, b);
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return -1;
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}
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static int tunnel_key_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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{
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struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
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return tcf_generic_walker(tn, skb, cb, type, ops);
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}
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static int tunnel_key_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, tunnel_key_net_id);
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return tcf_hash_search(tn, a, index);
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}
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static struct tc_action_ops act_tunnel_key_ops = {
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.kind = "tunnel_key",
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.type = TCA_ACT_TUNNEL_KEY,
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.owner = THIS_MODULE,
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.act = tunnel_key_act,
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.dump = tunnel_key_dump,
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.init = tunnel_key_init,
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.cleanup = tunnel_key_release,
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.walk = tunnel_key_walker,
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.lookup = tunnel_key_search,
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.size = sizeof(struct tcf_tunnel_key),
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};
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static __net_init int tunnel_key_init_net(struct net *net)
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{
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struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
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return tc_action_net_init(tn, &act_tunnel_key_ops, TUNNEL_KEY_TAB_MASK);
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}
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static void __net_exit tunnel_key_exit_net(struct net *net)
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{
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struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
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tc_action_net_exit(tn);
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}
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static struct pernet_operations tunnel_key_net_ops = {
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.init = tunnel_key_init_net,
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.exit = tunnel_key_exit_net,
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.id = &tunnel_key_net_id,
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.size = sizeof(struct tc_action_net),
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};
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static int __init tunnel_key_init_module(void)
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{
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return tcf_register_action(&act_tunnel_key_ops, &tunnel_key_net_ops);
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}
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static void __exit tunnel_key_cleanup_module(void)
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{
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tcf_unregister_action(&act_tunnel_key_ops, &tunnel_key_net_ops);
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}
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module_init(tunnel_key_init_module);
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module_exit(tunnel_key_cleanup_module);
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MODULE_AUTHOR("Amir Vadai <amir@vadai.me>");
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MODULE_DESCRIPTION("ip tunnel manipulation actions");
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MODULE_LICENSE("GPL v2");
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