cregit-Linux how code gets into the kernel

Release 4.11 drivers/net/ipvlan/ipvlan_core.c

/* Copyright (c) 2014 Mahesh Bandewar <maheshb@google.com>
 *
 * 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.
 *
 */

#include "ipvlan.h"


static u32 ipvlan_jhash_secret __read_mostly;


void ipvlan_init_secret(void) { net_get_random_once(&ipvlan_jhash_secret, sizeof(ipvlan_jhash_secret)); }

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void ipvlan_count_rx(const struct ipvl_dev *ipvlan, unsigned int len, bool success, bool mcast) { if (likely(success)) { struct ipvl_pcpu_stats *pcptr; pcptr = this_cpu_ptr(ipvlan->pcpu_stats); u64_stats_update_begin(&pcptr->syncp); pcptr->rx_pkts++; pcptr->rx_bytes += len; if (mcast) pcptr->rx_mcast++; u64_stats_update_end(&pcptr->syncp); } else { this_cpu_inc(ipvlan->pcpu_stats->rx_errs); } }

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EXPORT_SYMBOL_GPL(ipvlan_count_rx);
static u8 ipvlan_get_v6_hash(const void *iaddr) { const struct in6_addr *ip6_addr = iaddr; return __ipv6_addr_jhash(ip6_addr, ipvlan_jhash_secret) & IPVLAN_HASH_MASK; }

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static u8 ipvlan_get_v4_hash(const void *iaddr) { const struct in_addr *ip4_addr = iaddr; return jhash_1word(ip4_addr->s_addr, ipvlan_jhash_secret) & IPVLAN_HASH_MASK; }

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static struct ipvl_addr *ipvlan_ht_addr_lookup(const struct ipvl_port *port, const void *iaddr, bool is_v6) { struct ipvl_addr *addr; u8 hash; hash = is_v6 ? ipvlan_get_v6_hash(iaddr) : ipvlan_get_v4_hash(iaddr); hlist_for_each_entry_rcu(addr, &port->hlhead[hash], hlnode) { if (is_v6 && addr->atype == IPVL_IPV6 && ipv6_addr_equal(&addr->ip6addr, iaddr)) return addr; else if (!is_v6 && addr->atype == IPVL_IPV4 && addr->ip4addr.s_addr == ((struct in_addr *)iaddr)->s_addr) return addr; } return NULL; }

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void ipvlan_ht_addr_add(struct ipvl_dev *ipvlan, struct ipvl_addr *addr) { struct ipvl_port *port = ipvlan->port; u8 hash; hash = (addr->atype == IPVL_IPV6) ? ipvlan_get_v6_hash(&addr->ip6addr) : ipvlan_get_v4_hash(&addr->ip4addr); if (hlist_unhashed(&addr->hlnode)) hlist_add_head_rcu(&addr->hlnode, &port->hlhead[hash]); }

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void ipvlan_ht_addr_del(struct ipvl_addr *addr) { hlist_del_init_rcu(&addr->hlnode); }

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struct ipvl_addr *ipvlan_find_addr(const struct ipvl_dev *ipvlan, const void *iaddr, bool is_v6) { struct ipvl_addr *addr; list_for_each_entry(addr, &ipvlan->addrs, anode) { if ((is_v6 && addr->atype == IPVL_IPV6 && ipv6_addr_equal(&addr->ip6addr, iaddr)) || (!is_v6 && addr->atype == IPVL_IPV4 && addr->ip4addr.s_addr == ((struct in_addr *)iaddr)->s_addr)) return addr; } return NULL; }

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bool ipvlan_addr_busy(struct ipvl_port *port, void *iaddr, bool is_v6) { struct ipvl_dev *ipvlan; ASSERT_RTNL(); list_for_each_entry(ipvlan, &port->ipvlans, pnode) { if (ipvlan_find_addr(ipvlan, iaddr, is_v6)) return true; } return false; }

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static void *ipvlan_get_L3_hdr(struct sk_buff *skb, int *type) { void *lyr3h = NULL; switch (skb->protocol) { case htons(ETH_P_ARP): { struct arphdr *arph; if (unlikely(!pskb_may_pull(skb, sizeof(*arph)))) return NULL; arph = arp_hdr(skb); *type = IPVL_ARP; lyr3h = arph; break; } case htons(ETH_P_IP): { u32 pktlen; struct iphdr *ip4h; if (unlikely(!pskb_may_pull(skb, sizeof(*ip4h)))) return NULL; ip4h = ip_hdr(skb); pktlen = ntohs(ip4h->tot_len); if (ip4h->ihl < 5 || ip4h->version != 4) return NULL; if (skb->len < pktlen || pktlen < (ip4h->ihl * 4)) return NULL; *type = IPVL_IPV4; lyr3h = ip4h; break; } case htons(ETH_P_IPV6): { struct ipv6hdr *ip6h; if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h)))) return NULL; ip6h = ipv6_hdr(skb); if (ip6h->version != 6) return NULL; *type = IPVL_IPV6; lyr3h = ip6h; /* Only Neighbour Solicitation pkts need different treatment */ if (ipv6_addr_any(&ip6h->saddr) && ip6h->nexthdr == NEXTHDR_ICMP) { *type = IPVL_ICMPV6; lyr3h = ip6h + 1; } break; } default: return NULL; } return lyr3h; }

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unsigned int ipvlan_mac_hash(const unsigned char *addr) { u32 hash = jhash_1word(__get_unaligned_cpu32(addr+2), ipvlan_jhash_secret); return hash & IPVLAN_MAC_FILTER_MASK; }

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void ipvlan_process_multicast(struct work_struct *work) { struct ipvl_port *port = container_of(work, struct ipvl_port, wq); struct ethhdr *ethh; struct ipvl_dev *ipvlan; struct sk_buff *skb, *nskb; struct sk_buff_head list; unsigned int len; unsigned int mac_hash; int ret; u8 pkt_type; bool tx_pkt; __skb_queue_head_init(&list); spin_lock_bh(&port->backlog.lock); skb_queue_splice_tail_init(&port->backlog, &list); spin_unlock_bh(&port->backlog.lock); while ((skb = __skb_dequeue(&list)) != NULL) { struct net_device *dev = skb->dev; bool consumed = false; ethh = eth_hdr(skb); tx_pkt = IPVL_SKB_CB(skb)->tx_pkt; mac_hash = ipvlan_mac_hash(ethh->h_dest); if (ether_addr_equal(ethh->h_dest, port->dev->broadcast)) pkt_type = PACKET_BROADCAST; else pkt_type = PACKET_MULTICAST; rcu_read_lock(); list_for_each_entry_rcu(ipvlan, &port->ipvlans, pnode) { if (tx_pkt && (ipvlan->dev == skb->dev)) continue; if (!test_bit(mac_hash, ipvlan->mac_filters)) continue; if (!(ipvlan->dev->flags & IFF_UP)) continue; ret = NET_RX_DROP; len = skb->len + ETH_HLEN; nskb = skb_clone(skb, GFP_ATOMIC); local_bh_disable(); if (nskb) { consumed = true; nskb->pkt_type = pkt_type; nskb->dev = ipvlan->dev; if (tx_pkt) ret = dev_forward_skb(ipvlan->dev, nskb); else ret = netif_rx(nskb); } ipvlan_count_rx(ipvlan, len, ret == NET_RX_SUCCESS, true); local_bh_enable(); } rcu_read_unlock(); if (tx_pkt) { /* If the packet originated here, send it out. */ skb->dev = port->dev; skb->pkt_type = pkt_type; dev_queue_xmit(skb); } else { if (consumed) consume_skb(skb); else kfree_skb(skb); } if (dev) dev_put(dev); } }

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static void ipvlan_skb_crossing_ns(struct sk_buff *skb, struct net_device *dev) { bool xnet = true; if (dev) xnet = !net_eq(dev_net(skb->dev), dev_net(dev)); skb_scrub_packet(skb, xnet); if (dev) skb->dev = dev; }

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static int ipvlan_rcv_frame(struct ipvl_addr *addr, struct sk_buff **pskb, bool local) { struct ipvl_dev *ipvlan = addr->master; struct net_device *dev = ipvlan->dev; unsigned int len; rx_handler_result_t ret = RX_HANDLER_CONSUMED; bool success = false; struct sk_buff *skb = *pskb; len = skb->len + ETH_HLEN; /* Only packets exchanged between two local slaves need to have * device-up check as well as skb-share check. */ if (local) { if (unlikely(!(dev->flags & IFF_UP))) { kfree_skb(skb); goto out; } skb = skb_share_check(skb, GFP_ATOMIC); if (!skb) goto out; *pskb = skb; } ipvlan_skb_crossing_ns(skb, dev); if (local) { skb->pkt_type = PACKET_HOST; if (dev_forward_skb(ipvlan->dev, skb) == NET_RX_SUCCESS) success = true; } else { ret = RX_HANDLER_ANOTHER; success = true; } out: ipvlan_count_rx(ipvlan, len, success, false); return ret; }

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static struct ipvl_addr *ipvlan_addr_lookup(struct ipvl_port *port, void *lyr3h, int addr_type, bool use_dest) { struct ipvl_addr *addr = NULL; if (addr_type == IPVL_IPV6) { struct ipv6hdr *ip6h; struct in6_addr *i6addr; ip6h = (struct ipv6hdr *)lyr3h; i6addr = use_dest ? &ip6h->daddr : &ip6h->saddr; addr = ipvlan_ht_addr_lookup(port, i6addr, true); } else if (addr_type == IPVL_ICMPV6) { struct nd_msg *ndmh; struct in6_addr *i6addr; /* Make sure that the NeighborSolicitation ICMPv6 packets * are handled to avoid DAD issue. */ ndmh = (struct nd_msg *)lyr3h; if (ndmh->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) { i6addr = &ndmh->target; addr = ipvlan_ht_addr_lookup(port, i6addr, true); } } else if (addr_type == IPVL_IPV4) { struct iphdr *ip4h; __be32 *i4addr; ip4h = (struct iphdr *)lyr3h; i4addr = use_dest ? &ip4h->daddr : &ip4h->saddr; addr = ipvlan_ht_addr_lookup(port, i4addr, false); } else if (addr_type == IPVL_ARP) { struct arphdr *arph; unsigned char *arp_ptr; __be32 dip; arph = (struct arphdr *)lyr3h; arp_ptr = (unsigned char *)(arph + 1); if (use_dest) arp_ptr += (2 * port->dev->addr_len) + 4; else arp_ptr += port->dev->addr_len; memcpy(&dip, arp_ptr, 4); addr = ipvlan_ht_addr_lookup(port, &dip, false); } return addr; }

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static int ipvlan_process_v4_outbound(struct sk_buff *skb) { const struct iphdr *ip4h = ip_hdr(skb); struct net_device *dev = skb->dev; struct net *net = dev_net(dev); struct rtable *rt; int err, ret = NET_XMIT_DROP; struct flowi4 fl4 = { .flowi4_oif = dev->ifindex, .flowi4_tos = RT_TOS(ip4h->tos), .flowi4_flags = FLOWI_FLAG_ANYSRC, .daddr = ip4h->daddr, .saddr = ip4h->saddr, }; rt = ip_route_output_flow(net, &fl4, NULL); if (IS_ERR(rt)) goto err; if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) { ip_rt_put(rt); goto err; } skb_dst_set(skb, &rt->dst); err = ip_local_out(net, skb->sk, skb); if (unlikely(net_xmit_eval(err))) dev->stats.tx_errors++; else ret = NET_XMIT_SUCCESS; goto out; err: dev->stats.tx_errors++; kfree_skb(skb); out: return ret; }

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static int ipvlan_process_v6_outbound(struct sk_buff *skb) { const struct ipv6hdr *ip6h = ipv6_hdr(skb); struct net_device *dev = skb->dev; struct net *net = dev_net(dev); struct dst_entry *dst; int err, ret = NET_XMIT_DROP; struct flowi6 fl6 = { .flowi6_iif = dev->ifindex, .daddr = ip6h->daddr, .saddr = ip6h->saddr, .flowi6_flags = FLOWI_FLAG_ANYSRC, .flowlabel = ip6_flowinfo(ip6h), .flowi6_mark = skb->mark, .flowi6_proto = ip6h->nexthdr, }; dst = ip6_route_output(net, NULL, &fl6); if (dst->error) { ret = dst->error; dst_release(dst); goto err; } skb_dst_set(skb, dst); err = ip6_local_out(net, skb->sk, skb); if (unlikely(net_xmit_eval(err))) dev->stats.tx_errors++; else ret = NET_XMIT_SUCCESS; goto out; err: dev->stats.tx_errors++; kfree_skb(skb); out: return ret; }

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static int ipvlan_process_outbound(struct sk_buff *skb) { struct ethhdr *ethh = eth_hdr(skb); int ret = NET_XMIT_DROP; /* In this mode we dont care about multicast and broadcast traffic */ if (is_multicast_ether_addr(ethh->h_dest)) { pr_warn_ratelimited("Dropped {multi|broad}cast of type= [%x]\n", ntohs(skb->protocol)); kfree_skb(skb); goto out; } /* The ipvlan is a pseudo-L2 device, so the packets that we receive * will have L2; which need to discarded and processed further * in the net-ns of the main-device. */ if (skb_mac_header_was_set(skb)) { skb_pull(skb, sizeof(*ethh)); skb->mac_header = (typeof(skb->mac_header))~0U; skb_reset_network_header(skb); } if (skb->protocol == htons(ETH_P_IPV6)) ret = ipvlan_process_v6_outbound(skb); else if (skb->protocol == htons(ETH_P_IP)) ret = ipvlan_process_v4_outbound(skb); else { pr_warn_ratelimited("Dropped outbound packet type=%x\n", ntohs(skb->protocol)); kfree_skb(skb); } out: return ret; }

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static void ipvlan_multicast_enqueue(struct ipvl_port *port, struct sk_buff *skb, bool tx_pkt) { if (skb->protocol == htons(ETH_P_PAUSE)) { kfree_skb(skb); return; } /* Record that the deferred packet is from TX or RX path. By * looking at mac-addresses on packet will lead to erronus decisions. * (This would be true for a loopback-mode on master device or a * hair-pin mode of the switch.) */ IPVL_SKB_CB(skb)->tx_pkt = tx_pkt; spin_lock(&port->backlog.lock); if (skb_queue_len(&port->backlog) < IPVLAN_QBACKLOG_LIMIT) { if (skb->dev) dev_hold(skb->dev); __skb_queue_tail(&port->backlog, skb); spin_unlock(&port->backlog.lock); schedule_work(&port->wq); } else { spin_unlock(&port->backlog.lock); atomic_long_inc(&skb->dev->rx_dropped); kfree_skb(skb); } }

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static int ipvlan_xmit_mode_l3(struct sk_buff *skb, struct net_device *dev) { const struct ipvl_dev *ipvlan = netdev_priv(dev); void *lyr3h; struct ipvl_addr *addr; int addr_type; lyr3h = ipvlan_get_L3_hdr(skb, &addr_type); if (!lyr3h) goto out; addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true); if (addr) return ipvlan_rcv_frame(addr, &skb, true); out: ipvlan_skb_crossing_ns(skb, ipvlan->phy_dev); return ipvlan_process_outbound(skb); }

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static int ipvlan_xmit_mode_l2(struct sk_buff *skb, struct net_device *dev) { const struct ipvl_dev *ipvlan = netdev_priv(dev); struct ethhdr *eth = eth_hdr(skb); struct ipvl_addr *addr; void *lyr3h; int addr_type; if (ether_addr_equal(eth->h_dest, eth->h_source)) { lyr3h = ipvlan_get_L3_hdr(skb, &addr_type); if (lyr3h) { addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true); if (addr) return ipvlan_rcv_frame(addr, &skb, true); } skb = skb_share_check(skb, GFP_ATOMIC); if (!skb) return NET_XMIT_DROP; /* Packet definitely does not belong to any of the * virtual devices, but the dest is local. So forward * the skb for the main-dev. At the RX side we just return * RX_PASS for it to be processed further on the stack. */ return dev_forward_skb(ipvlan->phy_dev, skb); } else if (is_multicast_ether_addr(eth->h_dest)) { ipvlan_skb_crossing_ns(skb, NULL); ipvlan_multicast_enqueue(ipvlan->port, skb, true); return NET_XMIT_SUCCESS; } ipvlan_skb_crossing_ns(skb, ipvlan->phy_dev); return dev_queue_xmit(skb); }

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int ipvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev) { struct ipvl_dev *ipvlan = netdev_priv(dev); struct ipvl_port *port = ipvlan_port_get_rcu_bh(ipvlan->phy_dev); if (!port) goto out; if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr)))) goto out; switch(port->mode) { case IPVLAN_MODE_L2: return ipvlan_xmit_mode_l2(skb, dev); case IPVLAN_MODE_L3: case IPVLAN_MODE_L3S: return ipvlan_xmit_mode_l3(skb, dev); } /* Should not reach here */ WARN_ONCE(true, "ipvlan_queue_xmit() called for mode = [%hx]\n", port->mode); out: kfree_skb(skb); return NET_XMIT_DROP; }

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static bool ipvlan_external_frame(struct sk_buff *skb, struct ipvl_port *port) { struct ethhdr *eth = eth_hdr(skb); struct ipvl_addr *addr; void *lyr3h; int addr_type; if (ether_addr_equal(eth->h_source, skb->dev->dev_addr)) { lyr3h = ipvlan_get_L3_hdr(skb, &addr_type); if (!lyr3h) return true; addr = ipvlan_addr_lookup(port, lyr3h, addr_type, false); if (addr) return false; } return true; }

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Mahesh Bandewar96100.00%1100.00%
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static rx_handler_result_t ipvlan_handle_mode_l3(struct sk_buff **pskb, struct ipvl_port *port) { void *lyr3h; int addr_type; struct ipvl_addr *addr; struct sk_buff *skb = *pskb; rx_handler_result_t ret = RX_HANDLER_PASS; lyr3h = ipvlan_get_L3_hdr(skb, &addr_type); if (!lyr3h) goto out; addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true); if (addr) ret = ipvlan_rcv_frame(addr, pskb, false); out: return ret; }

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static rx_handler_result_t ipvlan_handle_mode_l2(struct sk_buff **pskb, struct ipvl_port *port) { struct sk_buff *skb = *pskb; struct ethhdr *eth = eth_hdr(skb); rx_handler_result_t ret = RX_HANDLER_PASS; void *lyr3h; int addr_type; if (is_multicast_ether_addr(eth->h_dest)) { if (ipvlan_external_frame(skb, port)) { struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); /* External frames are queued for device local * distribution, but a copy is given to master * straight away to avoid sending duplicates later * when work-queue processes this frame. This is * achieved by returning RX_HANDLER_PASS. */ if (nskb) { ipvlan_skb_crossing_ns(nskb, NULL); ipvlan_multicast_enqueue(port, nskb, false); } } } else { struct ipvl_addr *addr; lyr3h = ipvlan_get_L3_hdr(skb, &addr_type); if (!lyr3h) return ret; addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true); if (addr) ret = ipvlan_rcv_frame(addr, pskb, false); } return ret; }

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rx_handler_result_t ipvlan_handle_frame(struct sk_buff **pskb) { struct sk_buff *skb = *pskb; struct ipvl_port *port = ipvlan_port_get_rcu(skb->dev); if (!port) return RX_HANDLER_PASS; switch (port->mode) { case IPVLAN_MODE_L2: return ipvlan_handle_mode_l2(pskb, port); case IPVLAN_MODE_L3: return ipvlan_handle_mode_l3(pskb, port); case IPVLAN_MODE_L3S: return RX_HANDLER_PASS; } /* Should not reach here */ WARN_ONCE(true, "ipvlan_handle_frame() called for mode = [%hx]\n", port->mode); kfree_skb(skb); return RX_HANDLER_CONSUMED; }

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static struct ipvl_addr *ipvlan_skb_to_addr(struct sk_buff *skb, struct net_device *dev) { struct ipvl_addr *addr = NULL; struct ipvl_port *port; void *lyr3h; int addr_type; if (!dev || !netif_is_ipvlan_port(dev)) goto out; port = ipvlan_port_get_rcu(dev); if (!port || port->mode != IPVLAN_MODE_L3S) goto out; lyr3h = ipvlan_get_L3_hdr(skb, &addr_type); if (!lyr3h) goto out; addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true); out: return addr; }

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struct sk_buff *ipvlan_l3_rcv(struct net_device *dev, struct sk_buff *skb, u16 proto) { struct ipvl_addr *addr; struct net_device *sdev; addr = ipvlan_skb_to_addr(skb, dev); if (!addr) goto out; sdev = addr->master->dev; switch (proto) { case AF_INET: { int err; struct iphdr *ip4h = ip_hdr(skb); err = ip_route_input_noref(skb, ip4h->daddr, ip4h->saddr, ip4h->tos, sdev); if (unlikely(err)) goto out; break; } case AF_INET6: { struct dst_entry *dst; struct ipv6hdr *ip6h = ipv6_hdr(skb); int flags = RT6_LOOKUP_F_HAS_SADDR; struct flowi6 fl6 = { .flowi6_iif = sdev->ifindex, .daddr = ip6h->daddr, .saddr = ip6h->saddr, .flowlabel = ip6_flowinfo(ip6h), .flowi6_mark = skb->mark, .flowi6_proto = ip6h->nexthdr, }; skb_dst_drop(skb); dst = ip6_route_input_lookup(dev_net(sdev), sdev, &fl6, flags); skb_dst_set(skb, dst); break; } default: break; } out: return skb; }

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Mahesh Bandewar222100.00%1100.00%
Total222100.00%1100.00%


unsigned int ipvlan_nf_input(void *priv, struct sk_buff *skb, const struct nf_hook_state *state) { struct ipvl_addr *addr; unsigned int len; addr = ipvlan_skb_to_addr(skb, skb->dev); if (!addr) goto out; skb->dev = addr->master->dev; len = skb->len + ETH_HLEN; ipvlan_count_rx(addr->master, len, true, false); out: return NF_ACCEPT; }

Contributors

PersonTokensPropCommitsCommitProp
Mahesh Bandewar85100.00%1100.00%
Total85100.00%1100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Mahesh Bandewar354594.71%836.36%
Eric Dumazet721.92%14.55%
Jiri Benc631.68%313.64%
Eric W. Biedermann340.91%418.18%
Sabrina Dubroca200.53%29.09%
Sainath Grandhi50.13%14.55%
Brenden Blanco20.05%14.55%
Américo Wang10.03%14.55%
Daniel Borkmann10.03%14.55%
Total3743100.00%22100.00%
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