cregit-Linux how code gets into the kernel

Release 4.8 net/bridge/br_mdb.c

Directory: net/bridge
#include <linux/err.h>
#include <linux/igmp.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/rculist.h>
#include <linux/skbuff.h>
#include <linux/if_ether.h>
#include <net/ip.h>
#include <net/netlink.h>
#include <net/switchdev.h>
#if IS_ENABLED(CONFIG_IPV6)
#include <net/ipv6.h>
#include <net/addrconf.h>
#endif

#include "br_private.h"


static int br_rports_fill_info(struct sk_buff *skb, struct netlink_callback *cb, struct net_device *dev) { struct net_bridge *br = netdev_priv(dev); struct net_bridge_port *p; struct nlattr *nest, *port_nest; if (!br->multicast_router || hlist_empty(&br->router_list)) return 0; nest = nla_nest_start(skb, MDBA_ROUTER); if (nest == NULL) return -EMSGSIZE; hlist_for_each_entry_rcu(p, &br->router_list, rlist) { if (!p) continue; port_nest = nla_nest_start(skb, MDBA_ROUTER_PORT); if (!port_nest) goto fail; if (nla_put_nohdr(skb, sizeof(u32), &p->dev->ifindex) || nla_put_u32(skb, MDBA_ROUTER_PATTR_TIMER, br_timer_value(&p->multicast_router_timer)) || nla_put_u8(skb, MDBA_ROUTER_PATTR_TYPE, p->multicast_router)) { nla_nest_cancel(skb, port_nest); goto fail; } nla_nest_end(skb, port_nest); } nla_nest_end(skb, nest); return 0; fail: nla_nest_cancel(skb, nest); return -EMSGSIZE; }

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americo wangamerico wang12964.18%150.00%
nikolay aleksandrovnikolay aleksandrov7235.82%150.00%
Total201100.00%2100.00%


static void __mdb_entry_fill_flags(struct br_mdb_entry *e, unsigned char flags) { e->state = flags & MDB_PG_FLAGS_PERMANENT; e->flags = 0; if (flags & MDB_PG_FLAGS_OFFLOAD) e->flags |= MDB_FLAGS_OFFLOAD; }

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elad razelad raz41100.00%1100.00%
Total41100.00%1100.00%


static void __mdb_entry_to_br_ip(struct br_mdb_entry *entry, struct br_ip *ip) { memset(ip, 0, sizeof(struct br_ip)); ip->vid = entry->vid; ip->proto = entry->addr.proto; if (ip->proto == htons(ETH_P_IP)) ip->u.ip4 = entry->addr.u.ip4; #if IS_ENABLED(CONFIG_IPV6) else ip->u.ip6 = entry->addr.u.ip6; #endif }

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elad razelad raz95100.00%1100.00%
Total95100.00%1100.00%


static int br_mdb_fill_info(struct sk_buff *skb, struct netlink_callback *cb, struct net_device *dev) { struct net_bridge *br = netdev_priv(dev); struct net_bridge_mdb_htable *mdb; struct nlattr *nest, *nest2; int i, err = 0; int idx = 0, s_idx = cb->args[1]; if (br->multicast_disabled) return 0; mdb = rcu_dereference(br->mdb); if (!mdb) return 0; nest = nla_nest_start(skb, MDBA_MDB); if (nest == NULL) return -EMSGSIZE; for (i = 0; i < mdb->max; i++) { struct net_bridge_mdb_entry *mp; struct net_bridge_port_group *p; struct net_bridge_port_group __rcu **pp; struct net_bridge_port *port; hlist_for_each_entry_rcu(mp, &mdb->mhash[i], hlist[mdb->ver]) { if (idx < s_idx) goto skip; nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY); if (nest2 == NULL) { err = -EMSGSIZE; goto out; } for (pp = &mp->ports; (p = rcu_dereference(*pp)) != NULL; pp = &p->next) { struct nlattr *nest_ent; struct br_mdb_entry e; port = p->port; if (!port) continue; memset(&e, 0, sizeof(e)); e.ifindex = port->dev->ifindex; e.vid = p->addr.vid; __mdb_entry_fill_flags(&e, p->flags); if (p->addr.proto == htons(ETH_P_IP)) e.addr.u.ip4 = p->addr.u.ip4; #if IS_ENABLED(CONFIG_IPV6) if (p->addr.proto == htons(ETH_P_IPV6)) e.addr.u.ip6 = p->addr.u.ip6; #endif e.addr.proto = p->addr.proto; nest_ent = nla_nest_start(skb, MDBA_MDB_ENTRY_INFO); if (!nest_ent) { nla_nest_cancel(skb, nest2); err = -EMSGSIZE; goto out; } if (nla_put_nohdr(skb, sizeof(e), &e) || nla_put_u32(skb, MDBA_MDB_EATTR_TIMER, br_timer_value(&p->timer))) { nla_nest_cancel(skb, nest_ent); nla_nest_cancel(skb, nest2); err = -EMSGSIZE; goto out; } nla_nest_end(skb, nest_ent); } nla_nest_end(skb, nest2); skip: idx++; } } out: cb->args[1] = idx; nla_nest_end(skb, nest); return err; }

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americo wangamerico wang35873.06%222.22%
nikolay aleksandrovnikolay aleksandrov7916.12%333.33%
vlad yasevichvlad yasevich265.31%111.11%
mathias krausemathias krause132.65%111.11%
elad razelad raz102.04%111.11%
stephen hemmingerstephen hemminger40.82%111.11%
Total490100.00%9100.00%


static int br_mdb_dump(struct sk_buff *skb, struct netlink_callback *cb) { struct net_device *dev; struct net *net = sock_net(skb->sk); struct nlmsghdr *nlh = NULL; int idx = 0, s_idx; s_idx = cb->args[0]; rcu_read_lock(); /* In theory this could be wrapped to 0... */ cb->seq = net->dev_base_seq + br_mdb_rehash_seq; for_each_netdev_rcu(net, dev) { if (dev->priv_flags & IFF_EBRIDGE) { struct br_port_msg *bpm; if (idx < s_idx) goto skip; nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, RTM_GETMDB, sizeof(*bpm), NLM_F_MULTI); if (nlh == NULL) break; bpm = nlmsg_data(nlh); memset(bpm, 0, sizeof(*bpm)); bpm->ifindex = dev->ifindex; if (br_mdb_fill_info(skb, cb, dev) < 0) goto out; if (br_rports_fill_info(skb, cb, dev) < 0) goto out; cb->args[1] = 0; nlmsg_end(skb, nlh); skip: idx++; } } out: if (nlh) nlmsg_end(skb, nlh); rcu_read_unlock(); cb->args[0] = idx; return skb->len; }

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americo wangamerico wang23994.84%266.67%
mathias krausemathias krause135.16%133.33%
Total252100.00%3100.00%


static int nlmsg_populate_mdb_fill(struct sk_buff *skb, struct net_device *dev, struct br_mdb_entry *entry, u32 pid, u32 seq, int type, unsigned int flags) { struct nlmsghdr *nlh; struct br_port_msg *bpm; struct nlattr *nest, *nest2; nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), 0); if (!nlh) return -EMSGSIZE; bpm = nlmsg_data(nlh); memset(bpm, 0, sizeof(*bpm)); bpm->family = AF_BRIDGE; bpm->ifindex = dev->ifindex; nest = nla_nest_start(skb, MDBA_MDB); if (nest == NULL) goto cancel; nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY); if (nest2 == NULL) goto end; if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(*entry), entry)) goto end; nla_nest_end(skb, nest2); nla_nest_end(skb, nest); nlmsg_end(skb, nlh); return 0; end: nla_nest_end(skb, nest); cancel: nlmsg_cancel(skb, nlh); return -EMSGSIZE; }

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americo wangamerico wang20192.20%125.00%
mathias krausemathias krause135.96%125.00%
johannes bergjohannes berg31.38%125.00%
nicolas dichtelnicolas dichtel10.46%125.00%
Total218100.00%4100.00%


static inline size_t rtnl_mdb_nlmsg_size(void) { return NLMSG_ALIGN(sizeof(struct br_port_msg)) + nla_total_size(sizeof(struct br_mdb_entry)); }

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americo wangamerico wang28100.00%1100.00%
Total28100.00%1100.00%

struct br_mdb_complete_info { struct net_bridge_port *port; struct br_ip ip; };
static void br_mdb_complete(struct net_device *dev, int err, void *priv) { struct br_mdb_complete_info *data = priv; struct net_bridge_port_group __rcu **pp; struct net_bridge_port_group *p; struct net_bridge_mdb_htable *mdb; struct net_bridge_mdb_entry *mp; struct net_bridge_port *port = data->port; struct net_bridge *br = port->br; if (err) goto err; spin_lock_bh(&br->multicast_lock); mdb = mlock_dereference(br->mdb, br); mp = br_mdb_ip_get(mdb, &data->ip); if (!mp) goto out; for (pp = &mp->ports; (p = mlock_dereference(*pp, br)) != NULL; pp = &p->next) { if (p->port != port) continue; p->flags |= MDB_PG_FLAGS_OFFLOAD; } out: spin_unlock_bh(&br->multicast_lock); err: kfree(priv); }

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elad razelad raz175100.00%1100.00%
Total175100.00%1100.00%


static void __br_mdb_notify(struct net_device *dev, struct net_bridge_port *p, struct br_mdb_entry *entry, int type) { struct br_mdb_complete_info *complete_info; struct switchdev_obj_port_mdb mdb = { .obj = { .id = SWITCHDEV_OBJ_ID_PORT_MDB, .flags = SWITCHDEV_F_DEFER, }, .vid = entry->vid, }; struct net_device *port_dev; struct net *net = dev_net(dev); struct sk_buff *skb; int err = -ENOBUFS; port_dev = __dev_get_by_index(net, entry->ifindex); if (entry->addr.proto == htons(ETH_P_IP)) ip_eth_mc_map(entry->addr.u.ip4, mdb.addr); #if IS_ENABLED(CONFIG_IPV6) else ipv6_eth_mc_map(&entry->addr.u.ip6, mdb.addr); #endif mdb.obj.orig_dev = port_dev; if (port_dev && type == RTM_NEWMDB) { complete_info = kmalloc(sizeof(*complete_info), GFP_ATOMIC); if (complete_info) { complete_info->port = p; __mdb_entry_to_br_ip(entry, &complete_info->ip); mdb.obj.complete_priv = complete_info; mdb.obj.complete = br_mdb_complete; switchdev_port_obj_add(port_dev, &mdb.obj); } } else if (port_dev && type == RTM_DELMDB) { switchdev_port_obj_del(port_dev, &mdb.obj); } skb = nlmsg_new(rtnl_mdb_nlmsg_size(), GFP_ATOMIC); if (!skb) goto errout; err = nlmsg_populate_mdb_fill(skb, dev, entry, 0, 0, type, NTF_SELF); if (err < 0) { kfree_skb(skb); goto errout; } rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC); return; errout: rtnl_set_sk_err(net, RTNLGRP_MDB, err); }

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elad razelad raz20763.30%375.00%
americo wangamerico wang12036.70%125.00%
Total327100.00%4100.00%


void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port, struct br_ip *group, int type, u8 flags) { struct br_mdb_entry entry; memset(&entry, 0, sizeof(entry)); entry.ifindex = port->dev->ifindex; entry.addr.proto = group->proto; entry.addr.u.ip4 = group->u.ip4; #if IS_ENABLED(CONFIG_IPV6) entry.addr.u.ip6 = group->u.ip6; #endif entry.vid = group->vid; __mdb_entry_fill_flags(&entry, flags); __br_mdb_notify(dev, port, &entry, type); }

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americo wangamerico wang8365.35%116.67%
elad razelad raz2418.90%233.33%
mathias krausemathias krause1310.24%116.67%
nikolay aleksandrovnikolay aleksandrov75.51%233.33%
Total127100.00%6100.00%


static int nlmsg_populate_rtr_fill(struct sk_buff *skb, struct net_device *dev, int ifindex, u32 pid, u32 seq, int type, unsigned int flags) { struct br_port_msg *bpm; struct nlmsghdr *nlh; struct nlattr *nest; nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), NLM_F_MULTI); if (!nlh) return -EMSGSIZE; bpm = nlmsg_data(nlh); memset(bpm, 0, sizeof(*bpm)); bpm->family = AF_BRIDGE; bpm->ifindex = dev->ifindex; nest = nla_nest_start(skb, MDBA_ROUTER); if (!nest) goto cancel; if (nla_put_u32(skb, MDBA_ROUTER_PORT, ifindex)) goto end; nla_nest_end(skb, nest); nlmsg_end(skb, nlh); return 0; end: nla_nest_end(skb, nest); cancel: nlmsg_cancel(skb, nlh); return -EMSGSIZE; }

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satish ashoksatish ashok181100.00%1100.00%
Total181100.00%1100.00%


static inline size_t rtnl_rtr_nlmsg_size(void) { return NLMSG_ALIGN(sizeof(struct br_port_msg)) + nla_total_size(sizeof(__u32)); }

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satish ashoksatish ashok27100.00%1100.00%
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void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port, int type) { struct net *net = dev_net(dev); struct sk_buff *skb; int err = -ENOBUFS; int ifindex; ifindex = port ? port->dev->ifindex : 0; skb = nlmsg_new(rtnl_rtr_nlmsg_size(), GFP_ATOMIC); if (!skb) goto errout; err = nlmsg_populate_rtr_fill(skb, dev, ifindex, 0, 0, type, NTF_SELF); if (err < 0) { kfree_skb(skb); goto errout; } rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC); return; errout: rtnl_set_sk_err(net, RTNLGRP_MDB, err); }

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satish ashoksatish ashok134100.00%1100.00%
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static bool is_valid_mdb_entry(struct br_mdb_entry *entry) { if (entry->ifindex == 0) return false; if (entry->addr.proto == htons(ETH_P_IP)) { if (!ipv4_is_multicast(entry->addr.u.ip4)) return false; if (ipv4_is_local_multicast(entry->addr.u.ip4)) return false; #if IS_ENABLED(CONFIG_IPV6) } else if (entry->addr.proto == htons(ETH_P_IPV6)) { if (ipv6_addr_is_ll_all_nodes(&entry->addr.u.ip6)) return false; #endif } else return false; if (entry->state != MDB_PERMANENT && entry->state != MDB_TEMPORARY) return false; if (entry->vid >= VLAN_VID_MASK) return false; return true; }

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americo wangamerico wang13491.78%360.00%
nikolay aleksandrovnikolay aleksandrov117.53%120.00%
linus lussinglinus lussing10.68%120.00%
Total146100.00%5100.00%


static int br_mdb_parse(struct sk_buff *skb, struct nlmsghdr *nlh, struct net_device **pdev, struct br_mdb_entry **pentry) { struct net *net = sock_net(skb->sk); struct br_mdb_entry *entry; struct br_port_msg *bpm; struct nlattr *tb[MDBA_SET_ENTRY_MAX+1]; struct net_device *dev; int err; err = nlmsg_parse(nlh, sizeof(*bpm), tb, MDBA_SET_ENTRY_MAX, NULL); if (err < 0) return err; bpm = nlmsg_data(nlh); if (bpm->ifindex == 0) { pr_info("PF_BRIDGE: br_mdb_parse() with invalid ifindex\n"); return -EINVAL; } dev = __dev_get_by_index(net, bpm->ifindex); if (dev == NULL) { pr_info("PF_BRIDGE: br_mdb_parse() with unknown ifindex\n"); return -ENODEV; } if (!(dev->priv_flags & IFF_EBRIDGE)) { pr_info("PF_BRIDGE: br_mdb_parse() with non-bridge\n"); return -EOPNOTSUPP; } *pdev = dev; if (!tb[MDBA_SET_ENTRY] || nla_len(tb[MDBA_SET_ENTRY]) != sizeof(struct br_mdb_entry)) { pr_info("PF_BRIDGE: br_mdb_parse() with invalid attr\n"); return -EINVAL; } entry = nla_data(tb[MDBA_SET_ENTRY]); if (!is_valid_mdb_entry(entry)) { pr_info("PF_BRIDGE: br_mdb_parse() with invalid entry\n"); return -EINVAL; } *pentry = entry; return 0; }

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americo wangamerico wang24699.60%266.67%
nicolas dichtelnicolas dichtel10.40%133.33%
Total247100.00%3100.00%


static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port, struct br_ip *group, unsigned char state) { struct net_bridge_mdb_entry *mp; struct net_bridge_port_group *p; struct net_bridge_port_group __rcu **pp; struct net_bridge_mdb_htable *mdb; unsigned long now = jiffies; int err; mdb = mlock_dereference(br->mdb, br); mp = br_mdb_ip_get(mdb, group); if (!mp) { mp = br_multicast_new_group(br, port, group); err = PTR_ERR_OR_ZERO(mp); if (err) return err; } for (pp = &mp->ports; (p = mlock_dereference(*pp, br)) != NULL; pp = &p->next) { if (p->port == port) return -EEXIST; if ((unsigned long)p->port < (unsigned long)port) break; } p = br_multicast_new_port_group(port, group, *pp, state); if (unlikely(!p)) return -ENOMEM; rcu_assign_pointer(*pp, p); if (state == MDB_TEMPORARY) mod_timer(&