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https://gitlab.nic.cz/labs/bird.git
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Filter: Optimize IPv4 prefix sets
Use separate IPv4 and IPv6 implementation of prefix sets. Just this change makes IPv4 prefix sets 60% smaller and 50% faster.
This commit is contained in:
Ondrej Zajicek (work)
parent
d516c68ad8
commit
2755002890
@ -775,8 +775,8 @@ fprefix:
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;
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fprefix_set:
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fprefix { $$ = f_new_trie(cfg_mem, sizeof(struct f_trie_node)); trie_add_prefix($$, &($1.net), $1.lo, $1.hi); }
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| fprefix_set ',' fprefix { $$ = $1; trie_add_prefix($$, &($3.net), $3.lo, $3.hi); }
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fprefix { $$ = f_new_trie(cfg_mem, 0); trie_add_prefix($$, &($1.net), $1.lo, $1.hi); }
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| fprefix_set ',' fprefix { $$ = $1; if (!trie_add_prefix($$, &($3.net), $3.lo, $3.hi)) cf_error("Mixed IPv4/IPv6 prefixes in prefix set"); }
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;
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switch_body: /* EMPTY */ { $$ = NULL; }
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@ -138,19 +138,35 @@ struct f_tree {
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void *data;
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};
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struct f_trie_node4
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{
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ip4_addr addr, mask, accept;
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uint plen;
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struct f_trie_node4 *c[2];
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};
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struct f_trie_node6
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{
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ip6_addr addr, mask, accept;
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uint plen;
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struct f_trie_node6 *c[2];
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};
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struct f_trie_node
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{
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ip_addr addr, mask, accept;
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uint plen;
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struct f_trie_node *c[2];
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union {
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struct f_trie_node4 v4;
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struct f_trie_node6 v6;
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};
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};
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struct f_trie
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{
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linpool *lp;
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int zero;
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uint node_size;
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struct f_trie_node root[0]; /* Root trie node follows */
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u8 zero;
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s8 ipv4; /* -1 for undefined / empty */
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u16 data_size; /* Additional data for each trie node */
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struct f_trie_node root; /* Root trie node */
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};
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struct f_tree *f_new_tree(void);
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@ -159,7 +175,7 @@ const struct f_tree *find_tree(const struct f_tree *t, const struct f_val *val);
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int same_tree(const struct f_tree *t0, const struct f_tree *t2);
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void tree_format(const struct f_tree *t, buffer *buf);
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struct f_trie *f_new_trie(linpool *lp, uint node_size);
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struct f_trie *f_new_trie(linpool *lp, uint data_size);
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void *trie_add_prefix(struct f_trie *t, const net_addr *n, uint l, uint h);
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int trie_match_net(const struct f_trie *t, const net_addr *n);
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int trie_same(const struct f_trie *t1, const struct f_trie *t2);
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265
filter/trie.c
265
filter/trie.c
@ -77,9 +77,10 @@
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/*
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* In the trie code, the prefix length is internally treated as for the whole
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* ip_addr, regardless whether it contains an IPv4 or IPv6 address. Therefore,
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* remaining definitions make sense.
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* In the trie_add_prefix(), we use ip_addr (assuming that it is the same as
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* ip6_addr) to handle both IPv4 and IPv6 prefixes. In contrast to rest of the
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* BIRD, IPv4 addresses are just zero-padded from right. That is why we have
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* ipt_from_ip4() and ipt_to_ip4() macros below.
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*/
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#define ipa_mkmask(x) ip6_mkmask(x)
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@ -87,26 +88,30 @@
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#define ipa_pxlen(x,y) ip6_pxlen(x,y)
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#define ipa_getbit(x,n) ip6_getbit(x,n)
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#define ipt_from_ip4(x) _MI6(_I(x), 0, 0, 0)
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#define ipt_to_ip4(x) _MI4(_I0(x))
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/**
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* f_new_trie - allocates and returns a new empty trie
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* @lp: linear pool to allocate items from
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* @node_size: node size to be used (&f_trie_node and user data)
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* @data_size: user data attached to node
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*/
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struct f_trie *
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f_new_trie(linpool *lp, uint node_size)
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f_new_trie(linpool *lp, uint data_size)
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{
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struct f_trie * ret;
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ret = lp_allocz(lp, sizeof(struct f_trie) + node_size);
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ret = lp_allocz(lp, sizeof(struct f_trie) + data_size);
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ret->lp = lp;
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ret->node_size = node_size;
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ret->ipv4 = -1;
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ret->data_size = data_size;
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return ret;
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}
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static inline struct f_trie_node *
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new_node(struct f_trie *t, int plen, ip_addr paddr, ip_addr pmask, ip_addr amask)
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static inline struct f_trie_node4 *
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new_node4(struct f_trie *t, int plen, ip4_addr paddr, ip4_addr pmask, ip4_addr amask)
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{
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struct f_trie_node *n = lp_allocz(t->lp, t->node_size);
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struct f_trie_node4 *n = lp_allocz(t->lp, sizeof(struct f_trie_node4) + t->data_size);
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n->plen = plen;
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n->addr = paddr;
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n->mask = pmask;
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@ -114,12 +119,51 @@ new_node(struct f_trie *t, int plen, ip_addr paddr, ip_addr pmask, ip_addr amask
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return n;
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}
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static inline void
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attach_node(struct f_trie_node *parent, struct f_trie_node *child)
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static inline struct f_trie_node6 *
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new_node6(struct f_trie *t, int plen, ip6_addr paddr, ip6_addr pmask, ip6_addr amask)
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{
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parent->c[ipa_getbit(child->addr, parent->plen) ? 1 : 0] = child;
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struct f_trie_node6 *n = lp_allocz(t->lp, sizeof(struct f_trie_node6) + t->data_size);
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n->plen = plen;
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n->addr = paddr;
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n->mask = pmask;
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n->accept = amask;
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return n;
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}
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static inline struct f_trie_node *
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new_node(struct f_trie *t, int plen, ip_addr paddr, ip_addr pmask, ip_addr amask)
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{
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if (t->ipv4)
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return (struct f_trie_node *) new_node4(t, plen, ipt_to_ip4(paddr), ipt_to_ip4(pmask), ipt_to_ip4(amask));
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else
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return (struct f_trie_node *) new_node6(t, plen, ipa_to_ip6(paddr), ipa_to_ip6(pmask), ipa_to_ip6(amask));
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}
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static inline void
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attach_node4(struct f_trie_node4 *parent, struct f_trie_node4 *child)
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{
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parent->c[ip4_getbit(child->addr, parent->plen) ? 1 : 0] = child;
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}
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static inline void
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attach_node6(struct f_trie_node6 *parent, struct f_trie_node6 *child)
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{
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parent->c[ip6_getbit(child->addr, parent->plen) ? 1 : 0] = child;
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}
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static inline void
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attach_node(struct f_trie_node *parent, struct f_trie_node *child, int v4)
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{
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if (v4)
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attach_node4(&parent->v4, &child->v4);
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else
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attach_node6(&parent->v6, &child->v6);
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}
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#define GET_ADDR(N,F,X) ((X) ? ipt_from_ip4((N)->v4.F) : ipa_from_ip6((N)->v6.F))
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#define SET_ADDR(N,F,X,V) ({ if (X) (N)->v4.F =ipt_to_ip4(V); else (N)->v6.F =ipa_to_ip6(V); })
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#define GET_CHILD(N,F,X,I) ((X) ? (struct f_trie_node *) (N)->v4.c[I] : (struct f_trie_node *) (N)->v6.c[I])
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/**
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* trie_add_prefix
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* @t: trie to add to
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@ -133,21 +177,30 @@ attach_node(struct f_trie_node *parent, struct f_trie_node *child)
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*
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* Returns a pointer to the allocated node. The function can return a pointer to
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* an existing node if @px and @plen are the same. If px/plen == 0/0 (or ::/0),
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* a pointer to the root node is returned.
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* a pointer to the root node is returned. Returns NULL when called with
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* mismatched IPv4/IPv6 net type.
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*/
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void *
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trie_add_prefix(struct f_trie *t, const net_addr *net, uint l, uint h)
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{
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ip_addr px = net_prefix(net);
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uint plen = net_pxlen(net);
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ip_addr px;
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int v4;
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if (net->type == NET_IP4)
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switch (net->type)
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{
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const uint delta = IP6_MAX_PREFIX_LENGTH - IP4_MAX_PREFIX_LENGTH;
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plen += delta;
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l += delta;
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h += delta;
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case NET_IP4: px = ipt_from_ip4(net4_prefix(net)); v4 = 1; break;
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case NET_IP6: px = ipa_from_ip6(net6_prefix(net)); v4 = 0; break;
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default: bug("invalid type");
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}
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if (t->ipv4 != v4)
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{
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if (t->ipv4 < 0)
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t->ipv4 = v4;
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else
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return NULL;
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}
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if (l == 0)
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@ -162,86 +215,92 @@ trie_add_prefix(struct f_trie *t, const net_addr *net, uint l, uint h)
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ip_addr pmask = ipa_mkmask(plen);
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ip_addr paddr = ipa_and(px, pmask);
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struct f_trie_node *o = NULL;
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struct f_trie_node *n = t->root;
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struct f_trie_node *n = &t->root;
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while (n)
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{
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ip_addr cmask = ipa_and(n->mask, pmask);
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ip_addr naddr = GET_ADDR(n, addr, v4);
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ip_addr nmask = GET_ADDR(n, mask, v4);
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ip_addr accept = GET_ADDR(n, accept, v4);
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ip_addr cmask = ipa_and(nmask, pmask);
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uint nlen = v4 ? n->v4.plen : n->v6.plen;
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if (ipa_compare(ipa_and(paddr, cmask), ipa_and(n->addr, cmask)))
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if (ipa_compare(ipa_and(paddr, cmask), ipa_and(naddr, cmask)))
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{
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/* We are out of path - we have to add branching node 'b'
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between node 'o' and node 'n', and attach new node 'a'
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as the other child of 'b'. */
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int blen = ipa_pxlen(paddr, n->addr);
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int blen = ipa_pxlen(paddr, naddr);
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ip_addr bmask = ipa_mkmask(blen);
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ip_addr baddr = ipa_and(px, bmask);
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/* Merge accept masks from children to get accept mask for node 'b' */
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ip_addr baccm = ipa_and(ipa_or(amask, n->accept), bmask);
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ip_addr baccm = ipa_and(ipa_or(amask, accept), bmask);
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struct f_trie_node *a = new_node(t, plen, paddr, pmask, amask);
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struct f_trie_node *b = new_node(t, blen, baddr, bmask, baccm);
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attach_node(o, b);
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attach_node(b, n);
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attach_node(b, a);
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attach_node(o, b, v4);
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attach_node(b, n, v4);
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attach_node(b, a, v4);
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return a;
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}
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if (plen < n->plen)
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if (plen < nlen)
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{
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/* We add new node 'a' between node 'o' and node 'n' */
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amask = ipa_or(amask, ipa_and(n->accept, pmask));
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amask = ipa_or(amask, ipa_and(accept, pmask));
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struct f_trie_node *a = new_node(t, plen, paddr, pmask, amask);
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attach_node(o, a);
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attach_node(a, n);
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attach_node(o, a, v4);
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attach_node(a, n, v4);
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return a;
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}
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if (plen == n->plen)
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if (plen == nlen)
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{
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/* We already found added node in trie. Just update accept mask */
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n->accept = ipa_or(n->accept, amask);
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accept = ipa_or(accept, amask);
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SET_ADDR(n, accept, v4, accept);
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return n;
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}
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/* Update accept mask part M2 and go deeper */
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n->accept = ipa_or(n->accept, ipa_and(amask, n->mask));
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accept = ipa_or(accept, ipa_and(amask, nmask));
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SET_ADDR(n, accept, v4, accept);
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/* n->plen < plen and plen <= 32 (128) */
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o = n;
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n = n->c[ipa_getbit(paddr, n->plen) ? 1 : 0];
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n = GET_CHILD(n, c, v4, ipa_getbit(paddr, nlen) ? 1 : 0);
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}
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/* We add new tail node 'a' after node 'o' */
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struct f_trie_node *a = new_node(t, plen, paddr, pmask, amask);
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attach_node(o, a);
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attach_node(o, a, v4);
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return a;
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}
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static int
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trie_match_prefix(const struct f_trie *t, ip_addr px, uint plen)
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trie_match_net4(const struct f_trie *t, ip4_addr px, uint plen)
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{
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ip_addr pmask = ipa_mkmask(plen);
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ip_addr paddr = ipa_and(px, pmask);
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ip4_addr pmask = ip4_mkmask(plen);
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ip4_addr paddr = ip4_and(px, pmask);
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if (plen == 0)
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return t->zero;
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int plentest = plen - 1;
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const struct f_trie_node *n = t->root;
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const struct f_trie_node4 *n = &t->root.v4;
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while (n)
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{
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ip_addr cmask = ipa_and(n->mask, pmask);
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ip4_addr cmask = ip4_and(n->mask, pmask);
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/* We are out of path */
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if (ipa_compare(ipa_and(paddr, cmask), ipa_and(n->addr, cmask)))
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if (ip4_compare(ip4_and(paddr, cmask), ip4_and(n->addr, cmask)))
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return 0;
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/* Check accept mask */
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if (ipa_getbit(n->accept, plentest))
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if (ip4_getbit(n->accept, plentest))
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return 1;
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/* We finished trie walk and still no match */
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@ -249,7 +308,42 @@ trie_match_prefix(const struct f_trie *t, ip_addr px, uint plen)
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return 0;
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/* Choose children */
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n = n->c[(ipa_getbit(paddr, n->plen)) ? 1 : 0];
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n = n->c[(ip4_getbit(paddr, n->plen)) ? 1 : 0];
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}
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return 0;
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}
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static int
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trie_match_net6(const struct f_trie *t, ip6_addr px, uint plen)
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{
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ip6_addr pmask = ip6_mkmask(plen);
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ip6_addr paddr = ip6_and(px, pmask);
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if (plen == 0)
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return t->zero;
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int plentest = plen - 1;
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const struct f_trie_node6 *n = &t->root.v6;
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while (n)
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{
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ip6_addr cmask = ip6_and(n->mask, pmask);
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/* We are out of path */
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if (ip6_compare(ip6_and(paddr, cmask), ip6_and(n->addr, cmask)))
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return 0;
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/* Check accept mask */
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if (ip6_getbit(n->accept, plentest))
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return 1;
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/* We finished trie walk and still no match */
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if (plen <= n->plen)
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return 0;
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/* Choose children */
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n = n->c[(ip6_getbit(paddr, n->plen)) ? 1 : 0];
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}
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return 0;
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@ -267,20 +361,25 @@ trie_match_prefix(const struct f_trie *t, ip_addr px, uint plen)
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int
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trie_match_net(const struct f_trie *t, const net_addr *n)
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{
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uint add = 0;
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switch (n->type) {
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switch (n->type)
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{
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case NET_IP4:
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case NET_VPN4:
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case NET_ROA4:
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add = IP6_MAX_PREFIX_LENGTH - IP4_MAX_PREFIX_LENGTH;
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}
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return t->ipv4 ? trie_match_net4(t, net4_prefix(n), net_pxlen(n)) : 0;
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return trie_match_prefix(t, net_prefix(n), net_pxlen(n) + add);
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case NET_IP6:
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case NET_VPN6:
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case NET_ROA6:
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return !t->ipv4 ? trie_match_net6(t, net6_prefix(n), net_pxlen(n)) : 0;
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default:
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return 0;
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}
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}
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static int
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trie_node_same(const struct f_trie_node *t1, const struct f_trie_node *t2)
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trie_node_same4(const struct f_trie_node4 *t1, const struct f_trie_node4 *t2)
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{
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if ((t1 == NULL) && (t2 == NULL))
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return 1;
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@ -289,11 +388,28 @@ trie_node_same(const struct f_trie_node *t1, const struct f_trie_node *t2)
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return 0;
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if ((t1->plen != t2->plen) ||
|
||||
(! ipa_equal(t1->addr, t2->addr)) ||
|
||||
(! ipa_equal(t1->accept, t2->accept)))
|
||||
(! ip4_equal(t1->addr, t2->addr)) ||
|
||||
(! ip4_equal(t1->accept, t2->accept)))
|
||||
return 0;
|
||||
|
||||
return trie_node_same(t1->c[0], t2->c[0]) && trie_node_same(t1->c[1], t2->c[1]);
|
||||
return trie_node_same4(t1->c[0], t2->c[0]) && trie_node_same4(t1->c[1], t2->c[1]);
|
||||
}
|
||||
|
||||
static int
|
||||
trie_node_same6(const struct f_trie_node6 *t1, const struct f_trie_node6 *t2)
|
||||
{
|
||||
if ((t1 == NULL) && (t2 == NULL))
|
||||
return 1;
|
||||
|
||||
if ((t1 == NULL) || (t2 == NULL))
|
||||
return 0;
|
||||
|
||||
if ((t1->plen != t2->plen) ||
|
||||
(! ip6_equal(t1->addr, t2->addr)) ||
|
||||
(! ip6_equal(t1->accept, t2->accept)))
|
||||
return 0;
|
||||
|
||||
return trie_node_same6(t1->c[0], t2->c[0]) && trie_node_same6(t1->c[1], t2->c[1]);
|
||||
}
|
||||
|
||||
/**
|
||||
@ -306,20 +422,39 @@ trie_node_same(const struct f_trie_node *t1, const struct f_trie_node *t2)
|
||||
int
|
||||
trie_same(const struct f_trie *t1, const struct f_trie *t2)
|
||||
{
|
||||
return (t1->zero == t2->zero) && trie_node_same(t1->root, t2->root);
|
||||
if ((t1->zero != t2->zero) || (t1->ipv4 != t2->ipv4))
|
||||
return 0;
|
||||
|
||||
if (t1->ipv4)
|
||||
return trie_node_same4(&t1->root.v4, &t2->root.v4);
|
||||
else
|
||||
return trie_node_same6(&t1->root.v6, &t2->root.v6);
|
||||
}
|
||||
|
||||
static void
|
||||
trie_node_format(const struct f_trie_node *t, buffer *buf)
|
||||
trie_node_format4(const struct f_trie_node4 *t, buffer *buf)
|
||||
{
|
||||
if (t == NULL)
|
||||
return;
|
||||
|
||||
if (ipa_nonzero(t->accept))
|
||||
buffer_print(buf, "%I/%d{%I}, ", t->addr, t->plen, t->accept);
|
||||
if (ip4_nonzero(t->accept))
|
||||
buffer_print(buf, "%4I/%d{%4I}, ", t->addr, t->plen, t->accept);
|
||||
|
||||
trie_node_format(t->c[0], buf);
|
||||
trie_node_format(t->c[1], buf);
|
||||
trie_node_format4(t->c[0], buf);
|
||||
trie_node_format4(t->c[1], buf);
|
||||
}
|
||||
|
||||
static void
|
||||
trie_node_format6(const struct f_trie_node6 *t, buffer *buf)
|
||||
{
|
||||
if (t == NULL)
|
||||
return;
|
||||
|
||||
if (ip6_nonzero(t->accept))
|
||||
buffer_print(buf, "%6I/%d{%6I}, ", t->addr, t->plen, t->accept);
|
||||
|
||||
trie_node_format6(t->c[0], buf);
|
||||
trie_node_format6(t->c[1], buf);
|
||||
}
|
||||
|
||||
/**
|
||||
@ -335,8 +470,12 @@ trie_format(const struct f_trie *t, buffer *buf)
|
||||
buffer_puts(buf, "[");
|
||||
|
||||
if (t->zero)
|
||||
buffer_print(buf, "%I/%d, ", IPA_NONE, 0);
|
||||
trie_node_format(t->root, buf);
|
||||
buffer_print(buf, "%I/%d, ", t->ipv4 ? IPA_NONE4 : IPA_NONE6, 0);
|
||||
|
||||
if (t->ipv4)
|
||||
trie_node_format4(&t->root.v4, buf);
|
||||
else
|
||||
trie_node_format6(&t->root.v6, buf);
|
||||
|
||||
if (buf->pos == buf->end)
|
||||
return;
|
||||
|
||||
@ -103,7 +103,7 @@ t_match_net(void)
|
||||
{
|
||||
list prefixes; /* of structs f_extended_prefix */
|
||||
init_list(&prefixes);
|
||||
struct f_trie *trie = f_new_trie(config->mem, sizeof(struct f_trie_node));
|
||||
struct f_trie *trie = f_new_trie(config->mem, 0);
|
||||
|
||||
generate_random_ipv6_prefixes(&prefixes);
|
||||
struct f_prefix_node *n;
|
||||
@ -143,8 +143,8 @@ t_trie_same(void)
|
||||
int round;
|
||||
for (round = 0; round < TESTS_NUM*4; round++)
|
||||
{
|
||||
struct f_trie * trie1 = f_new_trie(config->mem, sizeof(struct f_trie_node));
|
||||
struct f_trie * trie2 = f_new_trie(config->mem, sizeof(struct f_trie_node));
|
||||
struct f_trie * trie1 = f_new_trie(config->mem, 0);
|
||||
struct f_trie * trie2 = f_new_trie(config->mem, 0);
|
||||
|
||||
list prefixes; /* a list of f_extended_prefix structures */
|
||||
init_list(&prefixes);
|
||||
|
||||
@ -2789,7 +2789,7 @@ rt_init_hostcache(rtable *tab)
|
||||
hc->slab = sl_new(rt_table_pool, sizeof(struct hostentry));
|
||||
|
||||
hc->lp = lp_new(rt_table_pool, LP_GOOD_SIZE(1024));
|
||||
hc->trie = f_new_trie(hc->lp, sizeof(struct f_trie_node));
|
||||
hc->trie = f_new_trie(hc->lp, 0);
|
||||
|
||||
tab->hostcache = hc;
|
||||
}
|
||||
@ -2943,7 +2943,7 @@ rt_update_hostcache(rtable *tab)
|
||||
|
||||
/* Reset the trie */
|
||||
lp_flush(hc->lp);
|
||||
hc->trie = f_new_trie(hc->lp, sizeof(struct f_trie_node));
|
||||
hc->trie = f_new_trie(hc->lp, 0);
|
||||
|
||||
WALK_LIST_DELSAFE(n, x, hc->hostentries)
|
||||
{
|
||||
|
||||
Loading…
Reference in New Issue
Block a user