diff options
| -rw-r--r-- | drivers/net/geneve.c | 356 | ||||
| -rw-r--r-- | include/net/geneve.h | 3 | ||||
| -rw-r--r-- | include/uapi/linux/if_link.h | 1 |
3 files changed, 275 insertions, 85 deletions
diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c index 0a6d9741d956..d05150cc25d4 100644 --- a/drivers/net/geneve.c +++ b/drivers/net/geneve.c @@ -15,6 +15,7 @@ #include <linux/netdevice.h> #include <linux/etherdevice.h> #include <linux/hash.h> +#include <net/dst_metadata.h> #include <net/rtnetlink.h> #include <net/geneve.h> @@ -36,6 +37,7 @@ MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); struct geneve_net { struct list_head geneve_list; struct hlist_head vni_list[VNI_HASH_SIZE]; + struct geneve_dev __rcu *collect_md_tun; }; /* Pseudo network device */ @@ -50,6 +52,7 @@ struct geneve_dev { struct sockaddr_in remote; /* IPv4 address for link partner */ struct list_head next; /* geneve's per namespace list */ __be16 dst_port; + bool collect_md; }; static int geneve_net_id; @@ -62,48 +65,95 @@ static inline __u32 geneve_net_vni_hash(u8 vni[3]) return hash_32(vnid, VNI_HASH_BITS); } -/* geneve receive/decap routine */ -static void geneve_rx(struct geneve_sock *gs, struct sk_buff *skb) +static __be64 vni_to_tunnel_id(const __u8 *vni) +{ +#ifdef __BIG_ENDIAN + return (vni[0] << 16) | (vni[1] << 8) | vni[2]; +#else + return (__force __be64)(((__force u64)vni[0] << 40) | + ((__force u64)vni[1] << 48) | + ((__force u64)vni[2] << 56)); +#endif +} + +static struct geneve_dev *geneve_lookup(struct geneve_net *gn, + struct geneve_sock *gs, + struct iphdr *iph, + struct genevehdr *gnvh) { struct inet_sock *sk = inet_sk(gs->sock->sk); - struct genevehdr *gnvh = geneve_hdr(skb); - struct geneve_dev *dummy, *geneve = NULL; - struct geneve_net *gn; - struct iphdr *iph = NULL; - struct pcpu_sw_netstats *stats; struct hlist_head *vni_list_head; - int err = 0; + struct geneve_dev *geneve; __u32 hash; - iph = ip_hdr(skb); /* Still outer IP header... */ - - gn = gs->rcv_data; + geneve = rcu_dereference(gn->collect_md_tun); + if (geneve) + return geneve; /* Find the device for this VNI */ hash = geneve_net_vni_hash(gnvh->vni); vni_list_head = &gn->vni_list[hash]; - hlist_for_each_entry_rcu(dummy, vni_list_head, hlist) { - if (!memcmp(gnvh->vni, dummy->vni, sizeof(dummy->vni)) && - iph->saddr == dummy->remote.sin_addr.s_addr && - sk->inet_sport == dummy->dst_port) { - geneve = dummy; - break; + 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) { + return geneve; } } + return NULL; +} + +/* geneve receive/decap routine */ +static void geneve_rx(struct geneve_sock *gs, struct sk_buff *skb) +{ + struct genevehdr *gnvh = geneve_hdr(skb); + struct metadata_dst *tun_dst = NULL; + struct geneve_dev *geneve = NULL; + struct pcpu_sw_netstats *stats; + struct geneve_net *gn; + struct iphdr *iph; + int err; + + iph = ip_hdr(skb); /* Still outer IP header... */ + gn = gs->rcv_data; + geneve = geneve_lookup(gn, gs, iph, gnvh); if (!geneve) goto drop; - /* Drop packets w/ critical options, - * since we don't support any... - */ - if (gnvh->critical) - goto drop; + if (ip_tunnel_collect_metadata() || geneve->collect_md) { + __be16 flags; + void *opts; + + flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT | + (gnvh->oam ? TUNNEL_OAM : 0) | + (gnvh->critical ? TUNNEL_CRIT_OPT : 0); + + tun_dst = udp_tun_rx_dst(skb, AF_INET, flags, + vni_to_tunnel_id(gnvh->vni), + gnvh->opt_len * 4); + if (!tun_dst) + goto drop; + + /* Update tunnel dst according to Geneve options. */ + opts = ip_tunnel_info_opts(&tun_dst->u.tun_info, + gnvh->opt_len * 4); + memcpy(opts, gnvh->options, gnvh->opt_len * 4); + } else { + /* Drop packets w/ critical options, + * since we don't support any... + */ + if (gnvh->critical) + goto drop; + } skb_reset_mac_header(skb); skb_scrub_packet(skb, !net_eq(geneve->net, dev_net(geneve->dev))); skb->protocol = eth_type_trans(skb, geneve->dev); skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); + if (tun_dst) + skb_dst_set(skb, &tun_dst->dst); + /* Ignore packet loops (and multicast echo) */ if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr)) goto drop; @@ -131,7 +181,6 @@ static void geneve_rx(struct geneve_sock *gs, struct sk_buff *skb) u64_stats_update_end(&stats->syncp); netif_rx(skb); - return; drop: /* Consume bad packet */ @@ -144,7 +193,6 @@ static int geneve_init(struct net_device *dev) dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); if (!dev->tstats) return -ENOMEM; - return 0; } @@ -180,69 +228,137 @@ static int geneve_stop(struct net_device *dev) return 0; } +static struct rtable *geneve_get_rt(struct sk_buff *skb, + struct net_device *dev, + struct flowi4 *fl4, + struct ip_tunnel_info *info) +{ + struct geneve_dev *geneve = netdev_priv(dev); + struct rtable *rt = NULL; + __u8 tos; + + memset(fl4, 0, sizeof(*fl4)); + fl4->flowi4_mark = skb->mark; + fl4->flowi4_proto = IPPROTO_UDP; + + if (info) { + fl4->daddr = info->key.u.ipv4.dst; + fl4->saddr = info->key.u.ipv4.src; + fl4->flowi4_tos = RT_TOS(info->key.tos); + } else { + tos = geneve->tos; + if (tos == 1) { + const struct iphdr *iip = ip_hdr(skb); + + tos = ip_tunnel_get_dsfield(iip, skb); + } + + fl4->flowi4_tos = RT_TOS(tos); + fl4->daddr = geneve->remote.sin_addr.s_addr; + } + + rt = ip_route_output_key(geneve->net, fl4); + if (IS_ERR(rt)) { + netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr); + dev->stats.tx_carrier_errors++; + return rt; + } + if (rt->dst.dev == dev) { /* is this necessary? */ + netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr); + dev->stats.collisions++; + ip_rt_put(rt); + return ERR_PTR(-EINVAL); + } + + return rt; +} + +/* Convert 64 bit tunnel ID to 24 bit VNI. */ +static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni) +{ +#ifdef __BIG_ENDIAN + vni[0] = (__force __u8)(tun_id >> 16); + vni[1] = (__force __u8)(tun_id >> 8); + vni[2] = (__force __u8)tun_id; +#else + vni[0] = (__force __u8)((__force u64)tun_id >> 40); + vni[1] = (__force __u8)((__force u64)tun_id >> 48); + vni[2] = (__force __u8)((__force u64)tun_id >> 56); +#endif +} + static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev) { struct geneve_dev *geneve = netdev_priv(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; - int err; - __be16 sport; __u8 tos, ttl; + __be16 sport; + bool xnet; + int err; - iip = ip_hdr(skb); - - skb_reset_mac_header(skb); - - /* TODO: port min/max limits should be configurable */ - sport = udp_flow_src_port(dev_net(dev), skb, 0, 0, true); - - tos = geneve->tos; - if (tos == 1) - tos = ip_tunnel_get_dsfield(iip, skb); + sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); - memset(&fl4, 0, sizeof(fl4)); - fl4.flowi4_tos = RT_TOS(tos); - fl4.daddr = geneve->remote.sin_addr.s_addr; - fl4.flowi4_mark = skb->mark; - fl4.flowi4_proto = IPPROTO_UDP; + if (geneve->collect_md) { + info = skb_tunnel_info(skb); + if (unlikely(info && info->mode != IP_TUNNEL_INFO_TX)) { + netdev_dbg(dev, "no tunnel metadata\n"); + goto tx_error; + } + } - rt = ip_route_output_key(geneve->net, &fl4); + rt = geneve_get_rt(skb, dev, &fl4, info); if (IS_ERR(rt)) { netdev_dbg(dev, "no route to %pI4\n", &fl4.daddr); dev->stats.tx_carrier_errors++; goto tx_error; } - if (rt->dst.dev == dev) { /* is this necessary? */ - netdev_dbg(dev, "circular route to %pI4\n", &fl4.daddr); - dev->stats.collisions++; - goto rt_tx_error; + 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); + } else { + 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); } - - tos = ip_tunnel_ecn_encap(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, - !net_eq(geneve->net, dev_net(geneve->dev))); if (err < 0) ip_rt_put(rt); iptunnel_xmit_stats(err, &dev->stats, dev->tstats); - return NETDEV_TX_OK; -rt_tx_error: - ip_rt_put(rt); tx_error: dev->stats.tx_errors++; dev_kfree_skb(skb); @@ -312,6 +428,7 @@ static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = { [IFLA_GENEVE_TTL] = { .type = NLA_U8 }, [IFLA_GENEVE_TOS] = { .type = NLA_U8 }, [IFLA_GENEVE_PORT] = { .type = NLA_U16 }, + [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG }, }; static int geneve_validate(struct nlattr *tb[], struct nlattr *data[]) @@ -337,71 +454,112 @@ static int geneve_validate(struct nlattr *tb[], struct nlattr *data[]) return 0; } -static int geneve_newlink(struct net *net, struct net_device *dev, - struct nlattr *tb[], struct nlattr *data[]) +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 */ - __u32 vni, hash; - __be16 dst_port; + __u32 hash; int err; - if (!data[IFLA_GENEVE_ID] || !data[IFLA_GENEVE_REMOTE]) - return -EINVAL; + 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; + } geneve->net = net; geneve->dev = dev; - vni = nla_get_u32(data[IFLA_GENEVE_ID]); geneve->vni[0] = (vni & 0x00ff0000) >> 16; geneve->vni[1] = (vni & 0x0000ff00) >> 8; geneve->vni[2] = vni & 0x000000ff; - geneve->remote.sin_addr.s_addr = - nla_get_in_addr(data[IFLA_GENEVE_REMOTE]); + geneve->remote.sin_addr.s_addr = rem_addr; if (IN_MULTICAST(ntohl(geneve->remote.sin_addr.s_addr))) return -EINVAL; - if (data[IFLA_GENEVE_PORT]) - dst_port = htons(nla_get_u16(data[IFLA_GENEVE_PORT])); - else - dst_port = htons(GENEVE_UDP_PORT); - 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)) && - dst_port == dummy->dst_port) { + htons(dst_port) == dummy->dst_port) { return -EBUSY; } } + geneve->ttl = ttl; + geneve->tos = tos; + geneve->dst_port = htons(dst_port); + geneve->collect_md = metadata; + err = register_netdevice(dev); if (err) return err; + list_add(&geneve->next, &gn->geneve_list); + hlist_add_head_rcu(&geneve->hlist, &gn->vni_list[hash]); + + if (geneve->collect_md) + rcu_assign_pointer(gn->collect_md_tun, geneve); + return 0; +} + +static int geneve_newlink(struct net *net, struct net_device *dev, + struct nlattr *tb[], struct nlattr *data[]) +{ + __u16 dst_port = GENEVE_UDP_PORT; + __u8 ttl = 0, tos = 0; + bool metadata = false; + __be32 rem_addr; + __u32 vni; + + if (!data[IFLA_GENEVE_ID] || !data[IFLA_GENEVE_REMOTE]) + return -EINVAL; + + vni = nla_get_u32(data[IFLA_GENEVE_ID]); + rem_addr = nla_get_in_addr(data[IFLA_GENEVE_REMOTE]); + if (data[IFLA_GENEVE_TTL]) - geneve->ttl = nla_get_u8(data[IFLA_GENEVE_TTL]); + ttl = nla_get_u8(data[IFLA_GENEVE_TTL]); if (data[IFLA_GENEVE_TOS]) - geneve->tos = nla_get_u8(data[IFLA_GENEVE_TOS]); + tos = nla_get_u8(data[IFLA_GENEVE_TOS]); - geneve->dst_port = dst_port; - list_add(&geneve->next, &gn->geneve_list); + if (data[IFLA_GENEVE_PORT]) + dst_port = nla_get_u16(data[IFLA_GENEVE_PORT]); - hlist_add_head_rcu(&geneve->hlist, &gn->vni_list[hash]); + if (data[IFLA_GENEVE_COLLECT_METADATA]) + metadata = true; - return 0; + return geneve_configure(net, dev, rem_addr, vni, + ttl, tos, dst_port, metadata); } 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); @@ -416,6 +574,7 @@ static size_t geneve_get_size(const struct net_device *dev) nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */ nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */ nla_total_size(sizeof(__u16)) + /* IFLA_GENEVE_PORT */ + nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */ 0; } @@ -439,6 +598,11 @@ static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev) if (nla_put_u16(skb, IFLA_GENEVE_PORT, ntohs(geneve->dst_port))) goto nla_put_failure; + if (geneve->collect_md) { + if (nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA)) + goto nla_put_failure; + } + return 0; nla_put_failure: @@ -458,6 +622,28 @@ static struct rtnl_link_ops geneve_link_ops __read_mostly = { .fill_info = geneve_fill_info, }; +struct net_device *geneve_dev_create_fb(struct net *net, const char *name, + u8 name_assign_type, u16 dst_port) +{ + struct nlattr *tb[IFLA_MAX + 1]; + struct net_device *dev; + int err; + + memset(tb, 0, sizeof(tb)); + dev = rtnl_create_link(net, name, name_assign_type, + &geneve_link_ops, tb); + if (IS_ERR(dev)) + return dev; + + err = geneve_configure(net, dev, 0, 0, 0, 0, dst_port, true); + if (err) { + free_netdev(dev); + return ERR_PTR(err); + } + return dev; +} +EXPORT_SYMBOL_GPL(geneve_dev_create_fb); + static __net_init int geneve_init_net(struct net *net) { struct geneve_net *gn = net_generic(net, geneve_net_id); diff --git a/include/net/geneve.h b/include/net/geneve.h index 2a0543a1899d..4245e1d23b9b 100644 --- a/include/net/geneve.h +++ b/include/net/geneve.h @@ -96,6 +96,9 @@ int geneve_xmit_skb(struct geneve_sock *gs, struct rtable *rt, __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 */ #endif /*ifdef__NET_GENEVE_H */ diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h index 9d73c31896d0..3a5f263cfc2f 100644 --- a/include/uapi/linux/if_link.h +++ b/include/uapi/linux/if_link.h @@ -411,6 +411,7 @@ enum { IFLA_GENEVE_TTL, IFLA_GENEVE_TOS, IFLA_GENEVE_PORT, /* destination port */ + IFLA_GENEVE_COLLECT_METADATA, __IFLA_GENEVE_MAX }; #define IFLA_GENEVE_MAX (__IFLA_GENEVE_MAX - 1) |