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linux 内核协议栈之路由添加

  • 2026-07-01 02:52:18
linux 内核协议栈之路由添加

目录

  1. 数据结构背景
  2. 关键数据结构
  3. 核心逻辑详解

数据结构背景

  • Trie 结构:Linux[1] 使用压缩 Trie(也称“LC-trie”变种)存储路由前缀。
  • 每个节点是  struct key_vector。内部节点(非叶子)包含子节点指针数组 tnode[]。
  • 叶子节点(IS_LEAF(n) 为真)包含一个 hlist 的 fib_alias,每个 fib_alias 对应一条具有相同前缀但不同 TOS/Type 的路由。
  • key = ntohl(flp->daddr):将网络字节序的目标 IP 转为主机字节序的 32 位整数,作为 Trie 查找键。
  • 为了便于理解,可以把Trie想像成一个压缩的二叉树,正常的二叉树,每个中间节点只表示一位,要么是0,要么是1,但是Trie的中间节点可以包含多个值,比如1011,它表示与1011相同前缀的路由可以从此节点的子节点下找。
  • 每个中间节点n->key的掩码长度32 - n->pos - n->bits,因此(key ^ n->key)>>n->pos表示节点n对应的n->bits子节点索引 ,叶子节点key的掩码长度是32 - n->slen

关键数据结构

structkey_vector { t_key key;   //该节点代表的前缀(主机序)unsignedchar pos;  // 该节点从第 pos 位开始分叉(0~31),即从高往低unsignedchar bits;  //本次分叉使用 bits 位,(即子节点数 = 2^bits)unsignedchar slen;     // 32-掩码长度,即子网掩码剩余的长度union {/* This list pointer if valid if (pos | bits) == 0 (LEAF) */structhlist_headleaf;//叶子节点/* This array is valid if (pos | bits) > 0 (TNODE) */structkey_vector __rcu *tnode[0];//中间节点 };};

核心逻辑详解

fib_table_insert是向压缩 Trie 插入新路由节点的核心函数,它首先以key为前缀,从trie树的根节点开始,调用fib_find_node查找与key进行最长匹配的路由信息。初次添加路由时,fib_find_node返回为NULL,tp返回与key最长匹配的父节点。接着它会调用fib_insert_alias->fib_insert_node来进行真正的插入。

intfib_table_insert(struct net *net, struct fib_table *tb,       struct fib_config *cfg, struct netlink_ext_ack *extack){structtrie *t = (structtrie *)tb->tb_data;structfib_alias *fa, *new_fa;structkey_vector *l, *tp; u16 nlflags = NLM_F_EXCL;structfib_info *fi; u8 plen = cfg->fc_dst_len; u8 slen = KEYLENGTH - plen; u8 tos = cfg->fc_tos; u32 key;int err; key = ntohl(cfg->fc_dst);if (!fib_valid_key_len(key, plen, extack))return -EINVAL; pr_debug("Insert table=%u %08x/%d\n", tb->tb_id, key, plen); fi = fib_create_info(cfg, extack);if (IS_ERR(fi)) {  err = PTR_ERR(fi);goto err; } l = fib_find_node(t, &tp, key); fa = l ? fib_find_alias(&l->leaf, slen, tos, fi->fib_priority,    tb->tb_id, false) : NULL; ………… nlflags |= NLM_F_CREATE; err = -ENOBUFS; new_fa = kmem_cache_alloc(fn_alias_kmem, GFP_KERNEL);if (!new_fa)goto out; new_fa->fa_info = fi;//fi 表示路由信息,里面包含路由类型,下一跳等信息 new_fa->fa_tos = tos; new_fa->fa_type = cfg->fc_type; new_fa->fa_state = 0; new_fa->fa_slen = slen;//  32 - 掩码长度 new_fa->tb_id = tb->tb_id; new_fa->fa_default = -1; new_fa->offload = 0; new_fa->trap = 0;/* Insert new entry to the list. */ err = fib_insert_alias(t, tp, l, new_fa, fa, key);//插入核心流程if (err)goto out_free_new_fa; …………succeeded:return0;out_remove_new_fa: fib_remove_alias(t, tp, l, new_fa);out_free_new_fa: kmem_cache_free(fn_alias_kmem, new_fa);out: fib_release_info(fi);err:return err;}

fib_insert_node 插入过程:

  • 生成叶子节点l。
  • 根据 tp->pos 和 tp->bits,从 key 中提取对应位作为子索引,获取 tp->tnode[idx] 指向的子节点 n。此时 n 可能是NULL,该槽位空,可直接插入叶子。如果n不为空,则说明新生成的叶子节点与n可以提取共同的前缀,然后将共同的前缀key赋值给新生成的节点tn。n与l成为tn的两个子节点,tp成为tn的父节点。
  • 调用node_push_suffix将叶子节点的剩余掩码长度(slen)冒泡到所有父节点中,方便以后路由查询时进行回溯。
  • 调用trie_rebalance进行压缩或展开,可以忽略,对于理解trie树没有帮助。
staticintfib_insert_node(struct trie *t, struct key_vector *tp,      struct fib_alias *new, t_key key){structkey_vector *n, *l; l = leaf_new(key, new);//生成路由叶子节点if (!l)goto noleaf;/* retrieve child from parent node */ n = get_child(tp, get_index(key, tp));/* Case 2: n is a LEAF or a TNODE and the key doesn't match.  *  *  Add a new tnode here  *  first tnode need some special handling  *  leaves us in position for handling as case 3  */if (n) {structkey_vector *tn;  tn = tnode_new(key, __fls(key ^ n->key), 1);if (!tn)goto notnode;/* initialize routes out of node */  NODE_INIT_PARENT(tn, tp);  put_child(tn, get_index(key, tn) ^ 1, n);/* start adding routes into the node */  put_child_root(tp, key, tn);  node_set_parent(n, tn);/* parent now has a NULL spot where the leaf can go */  tp = tn; }/* Case 3: n is NULL, and will just insert a new leaf */ node_push_suffix(tp, new->fa_slen); NODE_INIT_PARENT(l, tp); put_child_root(tp, key, l); trie_rebalance(t, tp);return0;notnode: node_free(l);noleaf:return -ENOMEM;}

参考资料

[1] 

linux内核版本: linux5.7.8,

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  1. CONNECT:[ UseTime:0.001021s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001507s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000682s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000670s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001413s ]
  6. SELECT * FROM `set` [ RunTime:0.000632s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001486s ]
  8. SELECT * FROM `article` WHERE `id` = 494100 LIMIT 1 [ RunTime:0.000990s ]
  9. UPDATE `article` SET `lasttime` = 1783073435 WHERE `id` = 494100 [ RunTime:0.016122s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000711s ]
  11. SELECT * FROM `article` WHERE `id` < 494100 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001157s ]
  12. SELECT * FROM `article` WHERE `id` > 494100 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001087s ]
  13. SELECT * FROM `article` WHERE `id` < 494100 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002367s ]
  14. SELECT * FROM `article` WHERE `id` < 494100 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003257s ]
  15. SELECT * FROM `article` WHERE `id` < 494100 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006948s ]
0.205950s