![Andy Zhou](/assets/img/avatar_default.png)
Fix a sparse warning introduced by Commit0b5e8b8eea
(net: Add Geneve tunneling protocol driver) caught by kbuild test robot: # apt-get install sparse # git checkout0b5e8b8eea
# make ARCH=x86_64 allmodconfig # make C=1 CF=-D__CHECK_ENDIAN__ # # # sparse warnings: (new ones prefixed by >>) # # >> net/ipv4/geneve.c:230:42: sparse: incorrect type in assignment (different base types) # net/ipv4/geneve.c:230:42: expected restricted __be32 [addressable] [assigned] [usertype] s_addr # net/ipv4/geneve.c:230:42: got unsigned long [unsigned] <noident> # Reported-by: kbuild test robot <fengguang.wu@intel.com> Signed-off-by: Andy Zhou <azhou@nicira.com> Signed-off-by: David S. Miller <davem@davemloft.net>
374 lines
8.7 KiB
C
374 lines
8.7 KiB
C
/*
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* Geneve: Generic Network Virtualization Encapsulation
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*
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* Copyright (c) 2014 Nicira, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/skbuff.h>
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#include <linux/rculist.h>
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#include <linux/netdevice.h>
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#include <linux/in.h>
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#include <linux/ip.h>
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#include <linux/udp.h>
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#include <linux/igmp.h>
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#include <linux/etherdevice.h>
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#include <linux/if_ether.h>
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#include <linux/if_vlan.h>
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#include <linux/hash.h>
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#include <linux/ethtool.h>
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#include <net/arp.h>
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#include <net/ndisc.h>
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#include <net/ip.h>
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#include <net/ip_tunnels.h>
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#include <net/icmp.h>
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#include <net/udp.h>
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#include <net/rtnetlink.h>
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#include <net/route.h>
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#include <net/dsfield.h>
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#include <net/inet_ecn.h>
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#include <net/net_namespace.h>
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#include <net/netns/generic.h>
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#include <net/geneve.h>
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#include <net/protocol.h>
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#include <net/udp_tunnel.h>
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#if IS_ENABLED(CONFIG_IPV6)
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#include <net/ipv6.h>
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#include <net/addrconf.h>
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#include <net/ip6_tunnel.h>
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#include <net/ip6_checksum.h>
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#endif
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#define PORT_HASH_BITS 8
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#define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
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/* per-network namespace private data for this module */
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struct geneve_net {
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struct hlist_head sock_list[PORT_HASH_SIZE];
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spinlock_t sock_lock; /* Protects sock_list */
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};
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static int geneve_net_id;
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static struct workqueue_struct *geneve_wq;
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static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
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{
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return (struct genevehdr *)(udp_hdr(skb) + 1);
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}
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static struct hlist_head *gs_head(struct net *net, __be16 port)
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{
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struct geneve_net *gn = net_generic(net, geneve_net_id);
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return &gn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
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}
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/* Find geneve socket based on network namespace and UDP port */
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static struct geneve_sock *geneve_find_sock(struct net *net, __be16 port)
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{
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struct geneve_sock *gs;
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hlist_for_each_entry_rcu(gs, gs_head(net, port), hlist) {
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if (inet_sk(gs->sock->sk)->inet_sport == port)
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return gs;
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}
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return NULL;
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}
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static void geneve_build_header(struct genevehdr *geneveh,
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__be16 tun_flags, u8 vni[3],
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u8 options_len, u8 *options)
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{
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geneveh->ver = GENEVE_VER;
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geneveh->opt_len = options_len / 4;
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geneveh->oam = !!(tun_flags & TUNNEL_OAM);
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geneveh->critical = !!(tun_flags & TUNNEL_CRIT_OPT);
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geneveh->rsvd1 = 0;
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memcpy(geneveh->vni, vni, 3);
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geneveh->proto_type = htons(ETH_P_TEB);
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geneveh->rsvd2 = 0;
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memcpy(geneveh->options, options, options_len);
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}
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/* Transmit a fully formated Geneve frame.
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*
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* When calling this function. The skb->data should point
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* to the geneve header which is fully formed.
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*
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* This function will add other UDP tunnel headers.
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*/
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int geneve_xmit_skb(struct geneve_sock *gs, struct rtable *rt,
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struct sk_buff *skb, __be32 src, __be32 dst, __u8 tos,
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__u8 ttl, __be16 df, __be16 src_port, __be16 dst_port,
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__be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt,
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bool xnet)
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{
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struct genevehdr *gnvh;
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int min_headroom;
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int err;
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skb = udp_tunnel_handle_offloads(skb, !gs->sock->sk->sk_no_check_tx);
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min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
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+ GENEVE_BASE_HLEN + opt_len + sizeof(struct iphdr)
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+ (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
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err = skb_cow_head(skb, min_headroom);
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if (unlikely(err))
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return err;
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if (vlan_tx_tag_present(skb)) {
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if (unlikely(!__vlan_put_tag(skb,
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skb->vlan_proto,
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vlan_tx_tag_get(skb)))) {
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err = -ENOMEM;
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return err;
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}
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skb->vlan_tci = 0;
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}
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gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len);
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geneve_build_header(gnvh, tun_flags, vni, opt_len, opt);
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return udp_tunnel_xmit_skb(gs->sock, rt, skb, src, dst,
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tos, ttl, df, src_port, dst_port, xnet);
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}
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EXPORT_SYMBOL_GPL(geneve_xmit_skb);
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static void geneve_notify_add_rx_port(struct geneve_sock *gs)
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{
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struct sock *sk = gs->sock->sk;
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sa_family_t sa_family = sk->sk_family;
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int err;
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if (sa_family == AF_INET) {
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err = udp_add_offload(&gs->udp_offloads);
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if (err)
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pr_warn("geneve: udp_add_offload failed with status %d\n",
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err);
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}
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}
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/* Callback from net/ipv4/udp.c to receive packets */
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static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
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{
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struct genevehdr *geneveh;
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struct geneve_sock *gs;
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int opts_len;
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/* Need Geneve and inner Ethernet header to be present */
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if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
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goto error;
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/* Return packets with reserved bits set */
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geneveh = geneve_hdr(skb);
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if (unlikely(geneveh->ver != GENEVE_VER))
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goto error;
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if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
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goto error;
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opts_len = geneveh->opt_len * 4;
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if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
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htons(ETH_P_TEB)))
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goto drop;
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gs = rcu_dereference_sk_user_data(sk);
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if (!gs)
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goto drop;
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gs->rcv(gs, skb);
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return 0;
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drop:
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/* Consume bad packet */
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kfree_skb(skb);
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return 0;
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error:
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/* Let the UDP layer deal with the skb */
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return 1;
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}
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static void geneve_del_work(struct work_struct *work)
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{
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struct geneve_sock *gs = container_of(work, struct geneve_sock,
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del_work);
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udp_tunnel_sock_release(gs->sock);
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kfree_rcu(gs, rcu);
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}
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static struct socket *geneve_create_sock(struct net *net, bool ipv6,
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__be16 port)
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{
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struct socket *sock;
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struct udp_port_cfg udp_conf;
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int err;
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memset(&udp_conf, 0, sizeof(udp_conf));
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if (ipv6) {
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udp_conf.family = AF_INET6;
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} else {
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udp_conf.family = AF_INET;
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udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
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}
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udp_conf.local_udp_port = port;
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/* Open UDP socket */
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err = udp_sock_create(net, &udp_conf, &sock);
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if (err < 0)
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return ERR_PTR(err);
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return sock;
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}
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/* Create new listen socket if needed */
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static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
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geneve_rcv_t *rcv, void *data,
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bool ipv6)
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{
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struct geneve_net *gn = net_generic(net, geneve_net_id);
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struct geneve_sock *gs;
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struct socket *sock;
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struct udp_tunnel_sock_cfg tunnel_cfg;
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gs = kzalloc(sizeof(*gs), GFP_KERNEL);
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if (!gs)
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return ERR_PTR(-ENOMEM);
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INIT_WORK(&gs->del_work, geneve_del_work);
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sock = geneve_create_sock(net, ipv6, port);
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if (IS_ERR(sock)) {
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kfree(gs);
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return ERR_CAST(sock);
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}
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gs->sock = sock;
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atomic_set(&gs->refcnt, 1);
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gs->rcv = rcv;
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gs->rcv_data = data;
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/* Initialize the geneve udp offloads structure */
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gs->udp_offloads.port = port;
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gs->udp_offloads.callbacks.gro_receive = NULL;
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gs->udp_offloads.callbacks.gro_complete = NULL;
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spin_lock(&gn->sock_lock);
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hlist_add_head_rcu(&gs->hlist, gs_head(net, port));
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geneve_notify_add_rx_port(gs);
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spin_unlock(&gn->sock_lock);
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/* Mark socket as an encapsulation socket */
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tunnel_cfg.sk_user_data = gs;
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tunnel_cfg.encap_type = 1;
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tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
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tunnel_cfg.encap_destroy = NULL;
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setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
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return gs;
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}
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struct geneve_sock *geneve_sock_add(struct net *net, __be16 port,
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geneve_rcv_t *rcv, void *data,
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bool no_share, bool ipv6)
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{
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struct geneve_sock *gs;
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gs = geneve_socket_create(net, port, rcv, data, ipv6);
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if (!IS_ERR(gs))
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return gs;
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if (no_share) /* Return error if sharing is not allowed. */
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return ERR_PTR(-EINVAL);
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gs = geneve_find_sock(net, port);
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if (gs) {
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if (gs->rcv == rcv)
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atomic_inc(&gs->refcnt);
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else
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gs = ERR_PTR(-EBUSY);
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} else {
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gs = ERR_PTR(-EINVAL);
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}
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return gs;
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}
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EXPORT_SYMBOL_GPL(geneve_sock_add);
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void geneve_sock_release(struct geneve_sock *gs)
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{
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if (!atomic_dec_and_test(&gs->refcnt))
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return;
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queue_work(geneve_wq, &gs->del_work);
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}
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EXPORT_SYMBOL_GPL(geneve_sock_release);
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static __net_init int geneve_init_net(struct net *net)
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{
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struct geneve_net *gn = net_generic(net, geneve_net_id);
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unsigned int h;
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spin_lock_init(&gn->sock_lock);
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for (h = 0; h < PORT_HASH_SIZE; ++h)
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INIT_HLIST_HEAD(&gn->sock_list[h]);
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return 0;
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}
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static struct pernet_operations geneve_net_ops = {
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.init = geneve_init_net,
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.exit = NULL,
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.id = &geneve_net_id,
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.size = sizeof(struct geneve_net),
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};
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static int __init geneve_init_module(void)
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{
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int rc;
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geneve_wq = alloc_workqueue("geneve", 0, 0);
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if (!geneve_wq)
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return -ENOMEM;
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rc = register_pernet_subsys(&geneve_net_ops);
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if (rc)
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return rc;
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pr_info("Geneve driver\n");
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return 0;
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}
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late_initcall(geneve_init_module);
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static void __exit geneve_cleanup_module(void)
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{
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destroy_workqueue(geneve_wq);
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}
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module_exit(geneve_cleanup_module);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Jesse Gross <jesse@nicira.com>");
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MODULE_DESCRIPTION("Driver for GENEVE encapsulated traffic");
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MODULE_ALIAS_RTNL_LINK("geneve");
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