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![David S. Miller](/assets/img/avatar_default.png)
Pablo Neira Ayuso says: ==================== Netfilter/IPVS fixes for net The following patchset contains Netfilter/IPVS fixes for your net tree: 1) Fix crash when dumping rules after conversion to RCU, from Florian Westphal. 2) Fix incorrect hook reinjection from nf_queue in case NF_REPEAT, from Jagdish Motwani. 3) Fix check for route existence in fib extension, from Phil Sutter. 4) Fix use after free in ip_vs_in() hook, from YueHaibing. 5) Check for veth existence from netfilter selftests, from Jeffrin Jose T. 6) Checksum corruption in UDP NAT helpers due to typo, from Florian Westphal. 7) Pass up packets to classic forwarding path regardless of IPv4 DF bit, patch for the flowtable infrastructure from Florian. 8) Set liberal TCP tracking for flows that are placed in the flowtable, in case they need to go back to classic forwarding path, also from Florian. 9) Don't add flow with sequence adjustment to flowtable, from Florian. 10) Skip IPv4 options from IPv6 datapath in flowtable, from Florian. 11) Add selftest for the flowtable infrastructure, from Florian. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
259 lines
6 KiB
C
259 lines
6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/netlink.h>
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#include <linux/netfilter.h>
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#include <linux/workqueue.h>
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#include <linux/spinlock.h>
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#include <linux/netfilter/nf_tables.h>
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#include <net/ip.h> /* for ipv4 options. */
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#include <net/netfilter/nf_tables.h>
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#include <net/netfilter/nf_tables_core.h>
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#include <net/netfilter/nf_conntrack_core.h>
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#include <linux/netfilter/nf_conntrack_common.h>
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#include <net/netfilter/nf_flow_table.h>
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struct nft_flow_offload {
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struct nft_flowtable *flowtable;
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};
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static int nft_flow_route(const struct nft_pktinfo *pkt,
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const struct nf_conn *ct,
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struct nf_flow_route *route,
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enum ip_conntrack_dir dir)
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{
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struct dst_entry *this_dst = skb_dst(pkt->skb);
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struct dst_entry *other_dst = NULL;
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struct flowi fl;
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memset(&fl, 0, sizeof(fl));
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switch (nft_pf(pkt)) {
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case NFPROTO_IPV4:
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fl.u.ip4.daddr = ct->tuplehash[dir].tuple.src.u3.ip;
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fl.u.ip4.flowi4_oif = nft_in(pkt)->ifindex;
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break;
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case NFPROTO_IPV6:
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fl.u.ip6.daddr = ct->tuplehash[dir].tuple.src.u3.in6;
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fl.u.ip6.flowi6_oif = nft_in(pkt)->ifindex;
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break;
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}
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nf_route(nft_net(pkt), &other_dst, &fl, false, nft_pf(pkt));
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if (!other_dst)
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return -ENOENT;
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route->tuple[dir].dst = this_dst;
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route->tuple[!dir].dst = other_dst;
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return 0;
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}
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static bool nft_flow_offload_skip(struct sk_buff *skb, int family)
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{
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if (skb_sec_path(skb))
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return true;
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if (family == NFPROTO_IPV4) {
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const struct ip_options *opt;
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opt = &(IPCB(skb)->opt);
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if (unlikely(opt->optlen))
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return true;
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}
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return false;
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}
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static void nft_flow_offload_eval(const struct nft_expr *expr,
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struct nft_regs *regs,
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const struct nft_pktinfo *pkt)
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{
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struct nft_flow_offload *priv = nft_expr_priv(expr);
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struct nf_flowtable *flowtable = &priv->flowtable->data;
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enum ip_conntrack_info ctinfo;
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struct nf_flow_route route;
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struct flow_offload *flow;
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enum ip_conntrack_dir dir;
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bool is_tcp = false;
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struct nf_conn *ct;
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int ret;
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if (nft_flow_offload_skip(pkt->skb, nft_pf(pkt)))
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goto out;
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ct = nf_ct_get(pkt->skb, &ctinfo);
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if (!ct)
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goto out;
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switch (ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum) {
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case IPPROTO_TCP:
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is_tcp = true;
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break;
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case IPPROTO_UDP:
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break;
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default:
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goto out;
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}
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if (nf_ct_ext_exist(ct, NF_CT_EXT_HELPER) ||
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ct->status & IPS_SEQ_ADJUST)
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goto out;
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if (!nf_ct_is_confirmed(ct))
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goto out;
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if (test_and_set_bit(IPS_OFFLOAD_BIT, &ct->status))
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goto out;
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dir = CTINFO2DIR(ctinfo);
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if (nft_flow_route(pkt, ct, &route, dir) < 0)
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goto err_flow_route;
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flow = flow_offload_alloc(ct, &route);
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if (!flow)
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goto err_flow_alloc;
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if (is_tcp) {
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ct->proto.tcp.seen[0].flags |= IP_CT_TCP_FLAG_BE_LIBERAL;
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ct->proto.tcp.seen[1].flags |= IP_CT_TCP_FLAG_BE_LIBERAL;
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}
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ret = flow_offload_add(flowtable, flow);
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if (ret < 0)
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goto err_flow_add;
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dst_release(route.tuple[!dir].dst);
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return;
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err_flow_add:
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flow_offload_free(flow);
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err_flow_alloc:
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dst_release(route.tuple[!dir].dst);
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err_flow_route:
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clear_bit(IPS_OFFLOAD_BIT, &ct->status);
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out:
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regs->verdict.code = NFT_BREAK;
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}
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static int nft_flow_offload_validate(const struct nft_ctx *ctx,
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const struct nft_expr *expr,
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const struct nft_data **data)
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{
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unsigned int hook_mask = (1 << NF_INET_FORWARD);
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return nft_chain_validate_hooks(ctx->chain, hook_mask);
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}
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static int nft_flow_offload_init(const struct nft_ctx *ctx,
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const struct nft_expr *expr,
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const struct nlattr * const tb[])
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{
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struct nft_flow_offload *priv = nft_expr_priv(expr);
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u8 genmask = nft_genmask_next(ctx->net);
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struct nft_flowtable *flowtable;
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if (!tb[NFTA_FLOW_TABLE_NAME])
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return -EINVAL;
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flowtable = nft_flowtable_lookup(ctx->table, tb[NFTA_FLOW_TABLE_NAME],
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genmask);
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if (IS_ERR(flowtable))
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return PTR_ERR(flowtable);
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priv->flowtable = flowtable;
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flowtable->use++;
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return nf_ct_netns_get(ctx->net, ctx->family);
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}
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static void nft_flow_offload_destroy(const struct nft_ctx *ctx,
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const struct nft_expr *expr)
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{
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struct nft_flow_offload *priv = nft_expr_priv(expr);
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priv->flowtable->use--;
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nf_ct_netns_put(ctx->net, ctx->family);
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}
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static int nft_flow_offload_dump(struct sk_buff *skb, const struct nft_expr *expr)
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{
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struct nft_flow_offload *priv = nft_expr_priv(expr);
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if (nla_put_string(skb, NFTA_FLOW_TABLE_NAME, priv->flowtable->name))
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goto nla_put_failure;
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return 0;
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nla_put_failure:
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return -1;
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}
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static struct nft_expr_type nft_flow_offload_type;
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static const struct nft_expr_ops nft_flow_offload_ops = {
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.type = &nft_flow_offload_type,
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.size = NFT_EXPR_SIZE(sizeof(struct nft_flow_offload)),
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.eval = nft_flow_offload_eval,
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.init = nft_flow_offload_init,
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.destroy = nft_flow_offload_destroy,
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.validate = nft_flow_offload_validate,
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.dump = nft_flow_offload_dump,
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};
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static struct nft_expr_type nft_flow_offload_type __read_mostly = {
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.name = "flow_offload",
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.ops = &nft_flow_offload_ops,
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.maxattr = NFTA_FLOW_MAX,
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.owner = THIS_MODULE,
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};
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static int flow_offload_netdev_event(struct notifier_block *this,
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unsigned long event, void *ptr)
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{
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struct net_device *dev = netdev_notifier_info_to_dev(ptr);
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if (event != NETDEV_DOWN)
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return NOTIFY_DONE;
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nf_flow_table_cleanup(dev);
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return NOTIFY_DONE;
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}
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static struct notifier_block flow_offload_netdev_notifier = {
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.notifier_call = flow_offload_netdev_event,
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};
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static int __init nft_flow_offload_module_init(void)
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{
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int err;
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err = register_netdevice_notifier(&flow_offload_netdev_notifier);
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if (err)
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goto err;
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err = nft_register_expr(&nft_flow_offload_type);
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if (err < 0)
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goto register_expr;
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return 0;
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register_expr:
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unregister_netdevice_notifier(&flow_offload_netdev_notifier);
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err:
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return err;
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}
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static void __exit nft_flow_offload_module_exit(void)
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{
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nft_unregister_expr(&nft_flow_offload_type);
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unregister_netdevice_notifier(&flow_offload_netdev_notifier);
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}
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module_init(nft_flow_offload_module_init);
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module_exit(nft_flow_offload_module_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
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MODULE_ALIAS_NFT_EXPR("flow_offload");
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