diff options
| -rw-r--r-- | drivers/net/Kconfig | 4 | ||||
| -rw-r--r-- | drivers/net/geneve.c | 507 | ||||
| -rw-r--r-- | include/net/geneve.h | 34 | ||||
| -rw-r--r-- | net/ipv4/Kconfig | 14 | ||||
| -rw-r--r-- | net/ipv4/Makefile | 1 | ||||
| -rw-r--r-- | net/ipv4/geneve_core.c | 447 |
6 files changed, 421 insertions, 586 deletions
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig index 770483b..d18eb60 100644 --- a/drivers/net/Kconfig +++ b/drivers/net/Kconfig @@ -180,8 +180,8 @@ config VXLAN will be called vxlan. config GENEVE - tristate "Generic Network Virtualization Encapsulation netdev" - depends on INET && GENEVE_CORE + tristate "Generic Network Virtualization Encapsulation" + depends on INET && NET_UDP_TUNNEL select NET_IP_TUNNEL ---help--- This allows one to create geneve virtual interfaces that provide diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c index d05150c..90d4d43 100644 --- a/drivers/net/geneve.c +++ b/drivers/net/geneve.c @@ -18,6 +18,7 @@ #include <net/dst_metadata.h> #include <net/rtnetlink.h> #include <net/geneve.h> +#include <net/protocol.h> #define GENEVE_NETDEV_VER "0.6" @@ -33,13 +34,18 @@ static bool log_ecn_error = true; module_param(log_ecn_error, bool, 0644); MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); +#define GENEVE_VER 0 +#define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr)) + /* per-network namespace private data for this module */ struct geneve_net { - struct list_head geneve_list; - struct hlist_head vni_list[VNI_HASH_SIZE]; - struct geneve_dev __rcu *collect_md_tun; + struct list_head geneve_list; + struct hlist_head vni_list[VNI_HASH_SIZE]; + struct list_head sock_list; }; +static int geneve_net_id; + /* Pseudo network device */ struct geneve_dev { struct hlist_node hlist; /* vni hash table */ @@ -55,7 +61,15 @@ struct geneve_dev { bool collect_md; }; -static int geneve_net_id; +struct geneve_sock { + bool collect_md; + struct geneve_net *gn; + struct list_head list; + struct socket *sock; + struct rcu_head rcu; + int refcnt; + struct udp_offload udp_offloads; +}; static inline __u32 geneve_net_vni_hash(u8 vni[3]) { @@ -76,51 +90,62 @@ static __be64 vni_to_tunnel_id(const __u8 *vni) #endif } -static struct geneve_dev *geneve_lookup(struct geneve_net *gn, - struct geneve_sock *gs, - struct iphdr *iph, - struct genevehdr *gnvh) +static struct geneve_dev *geneve_lookup(struct geneve_net *gn, __be16 port, + __be32 addr, u8 vni[]) { - struct inet_sock *sk = inet_sk(gs->sock->sk); struct hlist_head *vni_list_head; struct geneve_dev *geneve; __u32 hash; - geneve = rcu_dereference(gn->collect_md_tun); - if (geneve) - return geneve; - /* Find the device for this VNI */ - hash = geneve_net_vni_hash(gnvh->vni); + hash = geneve_net_vni_hash(vni); vni_list_head = &gn->vni_list[hash]; hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) { - if (!memcmp(gnvh->vni, geneve->vni, sizeof(geneve->vni)) && - iph->saddr == geneve->remote.sin_addr.s_addr && - sk->inet_sport == geneve->dst_port) { + if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) && + addr == geneve->remote.sin_addr.s_addr && + port == geneve->dst_port) { return geneve; } } return NULL; } +static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb) +{ + return (struct genevehdr *)(udp_hdr(skb) + 1); +} + /* geneve receive/decap routine */ static void geneve_rx(struct geneve_sock *gs, struct sk_buff *skb) { + struct inet_sock *sk = inet_sk(gs->sock->sk); struct genevehdr *gnvh = geneve_hdr(skb); + struct geneve_net *gn = gs->gn; struct metadata_dst *tun_dst = NULL; struct geneve_dev *geneve = NULL; struct pcpu_sw_netstats *stats; - struct geneve_net *gn; struct iphdr *iph; + u8 *vni; + __be32 addr; int err; iph = ip_hdr(skb); /* Still outer IP header... */ - gn = gs->rcv_data; - geneve = geneve_lookup(gn, gs, iph, gnvh); + + if (gs->collect_md) { + static u8 zero_vni[3]; + + vni = zero_vni; + addr = 0; + } else { + vni = gnvh->vni; + addr = iph->saddr; + } + + geneve = geneve_lookup(gn, sk->inet_sport, addr, vni); if (!geneve) goto drop; - if (ip_tunnel_collect_metadata() || geneve->collect_md) { + if (ip_tunnel_collect_metadata() || gs->collect_md) { __be16 flags; void *opts; @@ -201,31 +226,326 @@ static void geneve_uninit(struct net_device *dev) free_percpu(dev->tstats); } +/* Callback from net/ipv4/udp.c to receive packets */ +static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb) +{ + struct genevehdr *geneveh; + struct geneve_sock *gs; + int opts_len; + + /* Need Geneve and inner Ethernet header to be present */ + if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN))) + goto error; + + /* Return packets with reserved bits set */ + geneveh = geneve_hdr(skb); + if (unlikely(geneveh->ver != GENEVE_VER)) + goto error; + + if (unlikely(geneveh->proto_type != htons(ETH_P_TEB))) + goto error; + + opts_len = geneveh->opt_len * 4; + if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len, + htons(ETH_P_TEB))) + goto drop; + + gs = rcu_dereference_sk_user_data(sk); + if (!gs) + goto drop; + + geneve_rx(gs, skb); + return 0; + +drop: + /* Consume bad packet */ + kfree_skb(skb); + return 0; + +error: + /* Let the UDP layer deal with the skb */ + return 1; +} + +static struct socket *geneve_create_sock(struct net *net, bool ipv6, + __be16 port) +{ + struct socket *sock; + struct udp_port_cfg udp_conf; + int err; + + memset(&udp_conf, 0, sizeof(udp_conf)); + + if (ipv6) { + udp_conf.family = AF_INET6; + } else { + udp_conf.family = AF_INET; + udp_conf.local_ip.s_addr = htonl(INADDR_ANY); + } + + udp_conf.local_udp_port = port; + + /* Open UDP socket */ + err = udp_sock_create(net, &udp_conf, &sock); + if (err < 0) + return ERR_PTR(err); + + return sock; +} + +static void geneve_notify_add_rx_port(struct geneve_sock *gs) +{ + struct sock *sk = gs->sock->sk; + sa_family_t sa_family = sk->sk_family; + int err; + + if (sa_family == AF_INET) { + err = udp_add_offload(&gs->udp_offloads); + if (err) + pr_warn("geneve: udp_add_offload failed with status %d\n", + err); + } +} + +static int geneve_hlen(struct genevehdr *gh) +{ + return sizeof(*gh) + gh->opt_len * 4; +} + +static struct sk_buff **geneve_gro_receive(struct sk_buff **head, + struct sk_buff *skb, + struct udp_offload *uoff) +{ + struct sk_buff *p, **pp = NULL; + struct genevehdr *gh, *gh2; + unsigned int hlen, gh_len, off_gnv; + const struct packet_offload *ptype; + __be16 type; + int flush = 1; + + off_gnv = skb_gro_offset(skb); + hlen = off_gnv + sizeof(*gh); + gh = skb_gro_header_fast(skb, off_gnv); + if (skb_gro_header_hard(skb, hlen)) { + gh = skb_gro_header_slow(skb, hlen, off_gnv); + if (unlikely(!gh)) + goto out; + } + + if (gh->ver != GENEVE_VER || gh->oam) + goto out; + gh_len = geneve_hlen(gh); + + hlen = off_gnv + gh_len; + if (skb_gro_header_hard(skb, hlen)) { + gh = skb_gro_header_slow(skb, hlen, off_gnv); + if (unlikely(!gh)) + goto out; + } + + flush = 0; + + for (p = *head; p; p = p->next) { + if (!NAPI_GRO_CB(p)->same_flow) + continue; + + gh2 = (struct genevehdr *)(p->data + off_gnv); + if (gh->opt_len != gh2->opt_len || + memcmp(gh, gh2, gh_len)) { + NAPI_GRO_CB(p)->same_flow = 0; + continue; + } + } + + type = gh->proto_type; + + rcu_read_lock(); + ptype = gro_find_receive_by_type(type); + if (!ptype) { + flush = 1; + goto out_unlock; + } + + skb_gro_pull(skb, gh_len); + skb_gro_postpull_rcsum(skb, gh, gh_len); + pp = ptype->callbacks.gro_receive(head, skb); + +out_unlock: + rcu_read_unlock(); +out: + NAPI_GRO_CB(skb)->flush |= flush; + + return pp; +} + +static int geneve_gro_complete(struct sk_buff *skb, int nhoff, + struct udp_offload *uoff) +{ + struct genevehdr *gh; + struct packet_offload *ptype; + __be16 type; + int gh_len; + int err = -ENOSYS; + + udp_tunnel_gro_complete(skb, nhoff); + + gh = (struct genevehdr *)(skb->data + nhoff); + gh_len = geneve_hlen(gh); + type = gh->proto_type; + + rcu_read_lock(); + ptype = gro_find_complete_by_type(type); + if (ptype) + err = ptype->callbacks.gro_complete(skb, nhoff + gh_len); + + rcu_read_unlock(); + return err; +} + +/* Create new listen socket if needed */ +static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port, + bool ipv6) +{ + struct geneve_net *gn = net_generic(net, geneve_net_id); + struct geneve_sock *gs; + struct socket *sock; + struct udp_tunnel_sock_cfg tunnel_cfg; + + gs = kzalloc(sizeof(*gs), GFP_KERNEL); + if (!gs) + return ERR_PTR(-ENOMEM); + + sock = geneve_create_sock(net, ipv6, port); + if (IS_ERR(sock)) { + kfree(gs); + return ERR_CAST(sock); + } + + gs->sock = sock; + gs->refcnt = 1; + gs->gn = gn; + + /* Initialize the geneve udp offloads structure */ + gs->udp_offloads.port = port; + gs->udp_offloads.callbacks.gro_receive = geneve_gro_receive; + gs->udp_offloads.callbacks.gro_complete = geneve_gro_complete; + geneve_notify_add_rx_port(gs); + + /* Mark socket as an encapsulation socket */ + tunnel_cfg.sk_user_data = gs; + tunnel_cfg.encap_type = 1; + tunnel_cfg.encap_rcv = geneve_udp_encap_recv; + tunnel_cfg.encap_destroy = NULL; + setup_udp_tunnel_sock(net, sock, &tunnel_cfg); + + list_add(&gs->list, &gn->sock_list); + return gs; +} + +static void geneve_notify_del_rx_port(struct geneve_sock *gs) +{ + struct sock *sk = gs->sock->sk; + sa_family_t sa_family = sk->sk_family; + + if (sa_family == AF_INET) + udp_del_offload(&gs->udp_offloads); +} + +static void geneve_sock_release(struct geneve_sock *gs) +{ + if (--gs->refcnt) + return; + + list_del(&gs->list); + geneve_notify_del_rx_port(gs); + udp_tunnel_sock_release(gs->sock); + kfree_rcu(gs, rcu); +} + +static struct geneve_sock *geneve_find_sock(struct geneve_net *gn, + __be16 dst_port) +{ + struct geneve_sock *gs; + + list_for_each_entry(gs, &gn->sock_list, list) { + if (inet_sk(gs->sock->sk)->inet_sport == dst_port && + inet_sk(gs->sock->sk)->sk.sk_family == AF_INET) { + return gs; + } + } + return NULL; +} + static int geneve_open(struct net_device *dev) { struct geneve_dev *geneve = netdev_priv(dev); struct net *net = geneve->net; - struct geneve_net *gn = net_generic(geneve->net, geneve_net_id); + struct geneve_net *gn = net_generic(net, geneve_net_id); struct geneve_sock *gs; - gs = geneve_sock_add(net, geneve->dst_port, geneve_rx, gn, - false, false); + gs = geneve_find_sock(gn, geneve->dst_port); + if (gs) { + gs->refcnt++; + goto out; + } + + gs = geneve_socket_create(net, geneve->dst_port, false); if (IS_ERR(gs)) return PTR_ERR(gs); +out: + gs->collect_md = geneve->collect_md; geneve->sock = gs; - return 0; } static int geneve_stop(struct net_device *dev) { struct geneve_dev *geneve = netdev_priv(dev); - struct geneve_sock *gs = geneve->sock; - geneve_sock_release(gs); + geneve_sock_release(geneve->sock); + return 0; +} + +static int geneve_build_skb(struct rtable *rt, struct sk_buff *skb, + __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt, + bool csum) +{ + struct genevehdr *gnvh; + int min_headroom; + int err; + min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len + + GENEVE_BASE_HLEN + opt_len + sizeof(struct iphdr); + err = skb_cow_head(skb, min_headroom); + if (unlikely(err)) { + kfree_skb(skb); + goto free_rt; + } + + skb = udp_tunnel_handle_offloads(skb, csum); + if (IS_ERR(skb)) { + err = PTR_ERR(skb); + goto free_rt; + } + + gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len); + gnvh->ver = GENEVE_VER; + gnvh->opt_len = opt_len / 4; + gnvh->oam = !!(tun_flags & TUNNEL_OAM); + gnvh->critical = !!(tun_flags & TUNNEL_CRIT_OPT); + gnvh->rsvd1 = 0; + memcpy(gnvh->vni, vni, 3); + gnvh->proto_type = htons(ETH_P_TEB); + gnvh->rsvd2 = 0; + memcpy(gnvh->options, opt, opt_len); + + skb_set_inner_protocol(skb, htons(ETH_P_TEB)); return 0; + +free_rt: + ip_rt_put(rt); + return err; } static struct rtable *geneve_get_rt(struct sk_buff *skb, @@ -269,7 +589,6 @@ static struct rtable *geneve_get_rt(struct sk_buff *skb, ip_rt_put(rt); return ERR_PTR(-EINVAL); } - return rt; } @@ -293,15 +612,13 @@ static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev) struct geneve_sock *gs = geneve->sock; struct ip_tunnel_info *info = NULL; struct rtable *rt = NULL; - const struct iphdr *iip; /* interior IP header */ struct flowi4 fl4; __u8 tos, ttl; __be16 sport; - bool xnet; + bool udp_csum; + __be16 df; int err; - sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); - if (geneve->collect_md) { info = skb_tunnel_info(skb); if (unlikely(info && info->mode != IP_TUNNEL_INFO_TX)) { @@ -316,52 +633,57 @@ static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev) dev->stats.tx_carrier_errors++; goto tx_error; } + + sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); skb_reset_mac_header(skb); - xnet = !net_eq(geneve->net, dev_net(geneve->dev)); if (info) { const struct ip_tunnel_key *key = &info->key; - bool udp_csum; u8 *opts = NULL; u8 vni[3]; - __be16 df; tunnel_id_to_vni(key->tun_id, vni); - df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; - udp_csum = !!(key->tun_flags & TUNNEL_CSUM); - if (key->tun_flags & TUNNEL_GENEVE_OPT) opts = ip_tunnel_info_opts(info, info->options_len); - err = geneve_xmit_skb(gs, rt, skb, fl4.saddr, fl4.daddr, - key->tos, key->ttl, df, - sport, geneve->dst_port, - key->tun_flags, vni, - info->options_len, opts, udp_csum, xnet); + udp_csum = !!(key->tun_flags & TUNNEL_CSUM); + err = geneve_build_skb(rt, skb, key->tun_flags, vni, + info->options_len, opts, udp_csum); + if (unlikely(err)) + goto err; + + tos = key->tos; + ttl = key->ttl; + df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; } else { + const struct iphdr *iip; /* interior IP header */ + + udp_csum = false; + err = geneve_build_skb(rt, skb, 0, geneve->vni, + 0, NULL, udp_csum); + if (unlikely(err)) + goto err; + iip = ip_hdr(skb); tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, iip, skb); - ttl = geneve->ttl; if (!ttl && IN_MULTICAST(ntohl(fl4.daddr))) ttl = 1; - ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); - - /* no need to handle local destination and encap bypass...yet... */ - err = geneve_xmit_skb(gs, rt, skb, fl4.saddr, fl4.daddr, tos, - ttl, 0, sport, geneve->dst_port, 0, - geneve->vni, 0, NULL, false, xnet); + df = 0; } - if (err < 0) - ip_rt_put(rt); + err = udp_tunnel_xmit_skb(rt, gs->sock->sk, skb, fl4.saddr, fl4.daddr, + tos, ttl, df, sport, geneve->dst_port, + !net_eq(geneve->net, dev_net(geneve->dev)), + !udp_csum); iptunnel_xmit_stats(err, &dev->stats, dev->tstats); return NETDEV_TX_OK; tx_error: - dev->stats.tx_errors++; dev_kfree_skb(skb); +err: + dev->stats.tx_errors++; return NETDEV_TX_OK; } @@ -454,25 +776,44 @@ static int geneve_validate(struct nlattr *tb[], struct nlattr *data[]) return 0; } +static struct geneve_dev *geneve_find_dev(struct geneve_net *gn, + __be16 dst_port, + __be32 rem_addr, + u8 vni[], + bool *tun_on_same_port, + bool *tun_collect_md) +{ + struct geneve_dev *geneve, *t; + + *tun_on_same_port = false; + *tun_collect_md = false; + t = NULL; + list_for_each_entry(geneve, &gn->geneve_list, next) { + if (geneve->dst_port == dst_port) { + *tun_collect_md = geneve->collect_md; + *tun_on_same_port = true; + } + if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) && + rem_addr == geneve->remote.sin_addr.s_addr && + dst_port == geneve->dst_port) + t = geneve; + } + return t; +} + static int geneve_configure(struct net *net, struct net_device *dev, __be32 rem_addr, __u32 vni, __u8 ttl, __u8 tos, __u16 dst_port, bool metadata) { struct geneve_net *gn = net_generic(net, geneve_net_id); - struct geneve_dev *dummy, *geneve = netdev_priv(dev); - struct hlist_head *vni_list_head; - struct sockaddr_in remote; /* IPv4 address for link partner */ + struct geneve_dev *t, *geneve = netdev_priv(dev); + bool tun_collect_md, tun_on_same_port; __u32 hash; int err; if (metadata) { - if (rtnl_dereference(gn->collect_md_tun)) - return -EEXIST; - if (!list_empty(&gn->geneve_list)) - return -EPERM; - } else { - if (rtnl_dereference(gn->collect_md_tun)) - return -EPERM; + if (rem_addr || vni || tos || ttl) + return -EINVAL; } geneve->net = net; @@ -486,36 +827,31 @@ static int geneve_configure(struct net *net, struct net_device *dev, if (IN_MULTICAST(ntohl(geneve->remote.sin_addr.s_addr))) return -EINVAL; - remote = geneve->remote; - if (metadata) { - if (rem_addr || vni || tos || ttl) - return -EINVAL; - } - - hash = geneve_net_vni_hash(geneve->vni); - vni_list_head = &gn->vni_list[hash]; - hlist_for_each_entry_rcu(dummy, vni_list_head, hlist) { - if (!memcmp(geneve->vni, dummy->vni, sizeof(dummy->vni)) && - !memcmp(&remote, &dummy->remote, sizeof(dummy->remote)) && - htons(dst_port) == dummy->dst_port) { - return -EBUSY; - } - } - geneve->ttl = ttl; geneve->tos = tos; geneve->dst_port = htons(dst_port); geneve->collect_md = metadata; + t = geneve_find_dev(gn, htons(dst_port), rem_addr, geneve->vni, + &tun_on_same_port, &tun_collect_md); + if (t) + return -EBUSY; + + if (metadata) { + if (tun_on_same_port) + return -EPERM; + } else { + if (tun_collect_md) + return -EPERM; + } + err = register_netdevice(dev); if (err) return err; list_add(&geneve->next, &gn->geneve_list); + hash = geneve_net_vni_hash(geneve->vni); hlist_add_head_rcu(&geneve->hlist, &gn->vni_list[hash]); - - if (geneve->collect_md) - rcu_assign_pointer(gn->collect_md_tun, geneve); return 0; } @@ -554,12 +890,6 @@ static void geneve_dellink(struct net_device *dev, struct list_head *head) { struct geneve_dev *geneve = netdev_priv(dev); - if (geneve->collect_md) { - struct geneve_net *gn = net_generic(geneve->net, geneve_net_id); - - rcu_assign_pointer(gn->collect_md_tun, NULL); - } - if (!hlist_unhashed(&geneve->hlist)) hlist_del_rcu(&geneve->hlist); @@ -651,6 +981,7 @@ static __net_init int geneve_init_net(struct net *net) INIT_LIST_HEAD(&gn->geneve_list); + INIT_LIST_HEAD(&gn->sock_list); for (h = 0; h < VNI_HASH_SIZE; ++h) INIT_HLIST_HEAD(&gn->vni_list[h]); diff --git a/include/net/geneve.h b/include/net/geneve.h index 4245e1d..3106ed6 100644 --- a/include/net/geneve.h +++ b/include/net/geneve.h @@ -62,41 +62,7 @@ struct genevehdr { struct geneve_opt options[]; }; -static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb) -{ - return (struct genevehdr *)(udp_hdr(skb) + 1); -} - #ifdef CONFIG_INET -struct geneve_sock; - -typedef void (geneve_rcv_t)(struct geneve_sock *gs, struct sk_buff *skb); - -struct geneve_sock { - struct list_head list; - geneve_rcv_t *rcv; - void *rcv_data; - struct socket *sock; - struct rcu_head rcu; - int refcnt; - struct udp_offload udp_offloads; -}; - -#define GENEVE_VER 0 -#define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr)) - -struct geneve_sock *geneve_sock_add(struct net *net, __be16 port, - geneve_rcv_t *rcv, void *data, - bool no_share, bool ipv6); - -void geneve_sock_release(struct geneve_sock *vs); - -int geneve_xmit_skb(struct geneve_sock *gs, struct rtable *rt, - struct sk_buff *skb, __be32 src, __be32 dst, __u8 tos, - __u8 ttl, __be16 df, __be16 src_port, __be16 dst_port, - __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt, - bool csum, bool xnet); - struct net_device *geneve_dev_create_fb(struct net *net, const char *name, u8 name_assign_type, u16 dst_port); #endif /*ifdef CONFIG_INET */ diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig index 6fb3c90..416dfa0 100644 --- a/net/ipv4/Kconfig +++ b/net/ipv4/Kconfig @@ -331,20 +331,6 @@ config NET_FOU_IP_TUNNELS When this option is enabled IP tunnels can be configured to use FOU or GUE encapsulation. -config GENEVE_CORE - tristate "Generic Network Virtualization Encapsulation library" - depends on INET - select NET_UDP_TUNNEL - ---help--- - This allows one to create Geneve virtual interfaces that provide - Layer 2 Networks over Layer 3 Networks. Geneve is often used - to tunnel virtual network infrastructure in virtualized environments. - For more information see: - http://tools.ietf.org/html/draft-gross-geneve-01 - - To compile this driver as a module, choose M here: the module - - config INET_AH tristate "IP: AH transformation" select XFRM_ALGO diff --git a/net/ipv4/Makefile b/net/ipv4/Makefile index efc43f3..89aacb6 100644 --- a/net/ipv4/Makefile +++ b/net/ipv4/Makefile @@ -57,7 +57,6 @@ obj-$(CONFIG_TCP_CONG_YEAH) += tcp_yeah.o obj-$(CONFIG_TCP_CONG_ILLINOIS) += tcp_illinois.o obj-$(CONFIG_MEMCG_KMEM) += tcp_memcontrol.o obj-$(CONFIG_NETLABEL) += cipso_ipv4.o -obj-$(CONFIG_GENEVE_CORE) += geneve_core.o obj-$(CONFIG_XFRM) += xfrm4_policy.o xfrm4_state.o xfrm4_input.o \ xfrm4_output.o xfrm4_protocol.o diff --git a/net/ipv4/geneve_core.c b/net/ipv4/geneve_core.c deleted file mode 100644 index 311a4ba..0000000 --- a/net/ipv4/geneve_core.c +++ /dev/null @@ -1,447 +0,0 @@ -/* - * Geneve: Generic Network Virtualization Encapsulation - * - * Copyright (c) 2014 Nicira, Inc. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. - */ - -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt - -#include <linux/kernel.h> -#include <linux/types.h> -#include <linux/module.h> -#include <linux/errno.h> -#include <linux/slab.h> -#include <linux/skbuff.h> -#include <linux/list.h> -#include <linux/netdevice.h> -#include <linux/in.h> -#include <linux/ip.h> -#include <linux/udp.h> -#include <linux/igmp.h> -#include <linux/etherdevice.h> -#include <linux/if_ether.h> -#include <linux/if_vlan.h> -#include <linux/ethtool.h> -#include <linux/mutex.h> -#include <net/arp.h> -#include <net/ndisc.h> -#include <net/ip.h> -#include <net/ip_tunnels.h> -#include <net/icmp.h> -#include <net/udp.h> -#include <net/rtnetlink.h> -#include <net/route.h> -#include <net/dsfield.h> -#include <net/inet_ecn.h> -#include <net/net_namespace.h> -#include <net/netns/generic.h> -#include <net/geneve.h> -#include <net/protocol.h> -#include <net/udp_tunnel.h> -#if IS_ENABLED(CONFIG_IPV6) -#include <net/ipv6.h> -#include <net/addrconf.h> -#include <net/ip6_tunnel.h> -#include <net/ip6_checksum.h> -#endif - -/* Protects sock_list and refcounts. */ -static DEFINE_MUTEX(geneve_mutex); - -/* per-network namespace private data for this module */ -struct geneve_net { - struct list_head sock_list; -}; - -static int geneve_net_id; - -static struct geneve_sock *geneve_find_sock(struct net *net, - sa_family_t family, __be16 port) -{ - struct geneve_net *gn = net_generic(net, geneve_net_id); - struct geneve_sock *gs; - - list_for_each_entry(gs, &gn->sock_list, list) { - if (inet_sk(gs->sock->sk)->inet_sport == port && - inet_sk(gs->sock->sk)->sk.sk_family == family) - return gs; - } - - return NULL; -} - -static void geneve_build_header(struct genevehdr *geneveh, - __be16 tun_flags, u8 vni[3], - u8 options_len, u8 *options) -{ - geneveh->ver = GENEVE_VER; - geneveh->opt_len = options_len / 4; - geneveh->oam = !!(tun_flags & TUNNEL_OAM); - geneveh->critical = !!(tun_flags & TUNNEL_CRIT_OPT); - geneveh->rsvd1 = 0; - memcpy(geneveh->vni, vni, 3); - geneveh->proto_type = htons(ETH_P_TEB); - geneveh->rsvd2 = 0; - - memcpy(geneveh->options, options, options_len); -} - -/* Transmit a fully formatted Geneve frame. - * - * When calling this function. The skb->data should point - * to the geneve header which is fully formed. - * - * This function will add other UDP tunnel headers. - */ -int geneve_xmit_skb(struct geneve_sock *gs, struct rtable *rt, - struct sk_buff *skb, __be32 src, __be32 dst, __u8 tos, - __u8 ttl, __be16 df, __be16 src_port, __be16 dst_port, - __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt, - bool csum, bool xnet) -{ - struct genevehdr *gnvh; - int min_headroom; - int err; - - min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len - + GENEVE_BASE_HLEN + opt_len + sizeof(struct iphdr) - + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0); - - err = skb_cow_head(skb, min_headroom); - if (unlikely(err)) { - kfree_skb(skb); - return err; - } - - skb = vlan_hwaccel_push_inside(skb); - if (unlikely(!skb)) - return -ENOMEM; - - skb = udp_tunnel_handle_offloads(skb, csum); - if (IS_ERR(skb)) - return PTR_ERR(skb); - - gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len); - geneve_build_header(gnvh, tun_flags, vni, opt_len, opt); - - skb_set_inner_protocol(skb, htons(ETH_P_TEB)); - - return udp_tunnel_xmit_skb(rt, gs->sock->sk, skb, src, dst, - tos, ttl, df, src_port, dst_port, xnet, - !csum); -} -EXPORT_SYMBOL_GPL(geneve_xmit_skb); - -static int geneve_hlen(struct genevehdr *gh) -{ - return sizeof(*gh) + gh->opt_len * 4; -} - -static struct sk_buff **geneve_gro_receive(struct sk_buff **head, - struct sk_buff *skb, - struct udp_offload *uoff) -{ - struct sk_buff *p, **pp = NULL; - struct genevehdr *gh, *gh2; - unsigned int hlen, gh_len, off_gnv; - const struct packet_offload *ptype; - __be16 type; - int flush = 1; - - off_gnv = skb_gro_offset(skb); - hlen = off_gnv + sizeof(*gh); - gh = skb_gro_header_fast(skb, off_gnv); - if (skb_gro_header_hard(skb, hlen)) { - gh = skb_gro_header_slow(skb, hlen, off_gnv); - if (unlikely(!gh)) - goto out; - } - - if (gh->ver != GENEVE_VER || gh->oam) - goto out; - gh_len = geneve_hlen(gh); - - hlen = off_gnv + gh_len; - if (skb_gro_header_hard(skb, hlen)) { - gh = skb_gro_header_slow(skb, hlen, off_gnv); - if (unlikely(!gh)) - goto out; - } - - flush = 0; - - for (p = *head; p; p = p->next) { - if (!NAPI_GRO_CB(p)->same_flow) - continue; - - gh2 = (struct genevehdr *)(p->data + off_gnv); - if (gh->opt_len != gh2->opt_len || - memcmp(gh, gh2, gh_len)) { - NAPI_GRO_CB(p)->same_flow = 0; - continue; - } - } - - type = gh->proto_type; - - rcu_read_lock(); - ptype = gro_find_receive_by_type(type); - if (!ptype) { - flush = 1; - goto out_unlock; - } - - skb_gro_pull(skb, gh_len); - skb_gro_postpull_rcsum(skb, gh, gh_len); - pp = ptype->callbacks.gro_receive(head, skb); - -out_unlock: - rcu_read_unlock(); -out: - NAPI_GRO_CB(skb)->flush |= flush; - - return pp; -} - -static int geneve_gro_complete(struct sk_buff *skb, int nhoff, - struct udp_offload *uoff) -{ - struct genevehdr *gh; - struct packet_offload *ptype; - __be16 type; - int gh_len; - int err = -ENOSYS; - - udp_tunnel_gro_complete(skb, nhoff); - - gh = (struct genevehdr *)(skb->data + nhoff); - gh_len = geneve_hlen(gh); - type = gh->proto_type; - - rcu_read_lock(); - ptype = gro_find_complete_by_type(type); - if (ptype) - err = ptype->callbacks.gro_complete(skb, nhoff + gh_len); - - rcu_read_unlock(); - return err; -} - -static void geneve_notify_add_rx_port(struct geneve_sock *gs) -{ - struct sock *sk = gs->sock->sk; - sa_family_t sa_family = sk->sk_family; - int err; - - if (sa_family == AF_INET) { - err = udp_add_offload(&gs->udp_offloads); - if (err) - pr_warn("geneve: udp_add_offload failed with status %d\n", - err); - } -} - -static void geneve_notify_del_rx_port(struct geneve_sock *gs) -{ - struct sock *sk = gs->sock->sk; - sa_family_t sa_family = sk->sk_family; - - if (sa_family == AF_INET) - udp_del_offload(&gs->udp_offloads); -} - -/* Callback from net/ipv4/udp.c to receive packets */ -static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb) -{ - struct genevehdr *geneveh; - struct geneve_sock *gs; - int opts_len; - - /* Need Geneve and inner Ethernet header to be present */ - if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN))) - goto error; - - /* Return packets with reserved bits set */ - geneveh = geneve_hdr(skb); - - if (unlikely(geneveh->ver != GENEVE_VER)) - goto error; - - if (unlikely(geneveh->proto_type != htons(ETH_P_TEB))) - goto error; - - opts_len = geneveh->opt_len * 4; - if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len, - htons(ETH_P_TEB))) - goto drop; - - gs = rcu_dereference_sk_user_data(sk); - if (!gs) - goto drop; - - gs->rcv(gs, skb); - return 0; - -drop: - /* Consume bad packet */ - kfree_skb(skb); - return 0; - -error: - /* Let the UDP layer deal with the skb */ - return 1; -} - -static struct socket *geneve_create_sock(struct net *net, bool ipv6, - __be16 port) -{ - struct socket *sock; - struct udp_port_cfg udp_conf; - int err; - - memset(&udp_conf, 0, sizeof(udp_conf)); - - if (ipv6) { - udp_conf.family = AF_INET6; - } else { - udp_conf.family = AF_INET; - udp_conf.local_ip.s_addr = htonl(INADDR_ANY); - } - - udp_conf.local_udp_port = port; - - /* Open UDP socket */ - err = udp_sock_create(net, &udp_conf, &sock); - if (err < 0) - return ERR_PTR(err); - - return sock; -} - -/* Create new listen socket if needed */ -static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port, - geneve_rcv_t *rcv, void *data, - bool ipv6) -{ - struct geneve_net *gn = net_generic(net, geneve_net_id); - struct geneve_sock *gs; - struct socket *sock; - struct udp_tunnel_sock_cfg tunnel_cfg; - - gs = kzalloc(sizeof(*gs), GFP_KERNEL); - if (!gs) - return ERR_PTR(-ENOMEM); - - sock = geneve_create_sock(net, ipv6, port); - if (IS_ERR(sock)) { - kfree(gs); - return ERR_CAST(sock); - } - - gs->sock = sock; - gs->refcnt = 1; - gs->rcv = rcv; - gs->rcv_data = data; - - /* Initialize the geneve udp offloads structure */ - gs->udp_offloads.port = port; - gs->udp_offloads.callbacks.gro_receive = geneve_gro_receive; - gs->udp_offloads.callbacks.gro_complete = geneve_gro_complete; - geneve_notify_add_rx_port(gs); - - /* Mark socket as an encapsulation socket */ - tunnel_cfg.sk_user_data = gs; - tunnel_cfg.encap_type = 1; - tunnel_cfg.encap_rcv = geneve_udp_encap_recv; - tunnel_cfg.encap_destroy = NULL; - setup_udp_tunnel_sock(net, sock, &tunnel_cfg); - - list_add(&gs->list, &gn->sock_list); - - return gs; -} - -struct geneve_sock *geneve_sock_add(struct net *net, __be16 port, - geneve_rcv_t *rcv, void *data, - bool no_share, bool ipv6) -{ - struct geneve_sock *gs; - - mutex_lock(&geneve_mutex); - - gs = geneve_find_sock(net, ipv6 ? AF_INET6 : AF_INET, port); - if (gs) { - if (!no_share && gs->rcv == rcv) - gs->refcnt++; - else - gs = ERR_PTR(-EBUSY); - } else { - gs = geneve_socket_create(net, port, rcv, data, ipv6); - } - - mutex_unlock(&geneve_mutex); - - return gs; -} -EXPORT_SYMBOL_GPL(geneve_sock_add); - -void geneve_sock_release(struct geneve_sock *gs) -{ - mutex_lock(&geneve_mutex); - - if (--gs->refcnt) - goto unlock; - - list_del(&gs->list); - geneve_notify_del_rx_port(gs); - udp_tunnel_sock_release(gs->sock); - kfree_rcu(gs, rcu); - -unlock: - mutex_unlock(&geneve_mutex); -} -EXPORT_SYMBOL_GPL(geneve_sock_release); - -static __net_init int geneve_init_net(struct net *net) -{ - struct geneve_net *gn = net_generic(net, geneve_net_id); - - INIT_LIST_HEAD(&gn->sock_list); - - return 0; -} - -static struct pernet_operations geneve_net_ops = { - .init = geneve_init_net, - .id = &geneve_net_id, - .size = sizeof(struct geneve_net), -}; - -static int __init geneve_init_module(void) -{ - int rc; - - rc = register_pernet_subsys(&geneve_net_ops); - if (rc) - return rc; - - pr_info("Geneve core logic\n"); - - return 0; -} -module_init(geneve_init_module); - -static void __exit geneve_cleanup_module(void) -{ - unregister_pernet_subsys(&geneve_net_ops); -} -module_exit(geneve_cleanup_module); - -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Jesse Gross <jesse@nicira.com>"); -MODULE_DESCRIPTION("Driver library for GENEVE encapsulated traffic"); |