mirror of
https://github.com/lgcosta/pf-linux-port.git
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M1: compat layer + pf.ko skeleton builds against Linux 7.3.4
- pfk.h: BSD types/ioctl encoding (OpenBSD bit layout), locks (NET_LOCK=rwsem), pools, timeouts, mbuf shim over sk_buff, ifnet registry, toeplitz/siphash - pfk_mod/pfk_hooks: misc /dev/pf (0600), IPv4 netfilter hook skeleton, DIOCGETSTATUS answered (M1 skeleton; engine ioctls land with pf_ioctl.c) - vendorize/stage-port scripts: deterministic upstream staging with seds (struct renames, IFF_*->PFIFF_*, sa_len drops) logged to docs/porting-notes - fixes: modules_prepare+Module.symvers for out-of-tree builds
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@@ -0,0 +1,945 @@
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/* PFLINUX port of OpenBSD 8.0 net/pf_lb.c — see docs/porting-notes.md */
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#include <pfk.h>
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u_int64_t pf_hash(struct pf_addr *, struct pf_addr *,
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struct pf_poolhashkey *, sa_family_t);
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int pf_get_sport(struct pf_pdesc *, struct pf_rule *,
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struct pf_addr *, u_int16_t *, u_int16_t,
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u_int16_t, struct pf_src_node **);
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int pf_map_addr_states_increase(sa_family_t,
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struct pf_pool *, struct pf_addr *);
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int pf_get_transaddr_af(struct pf_rule *,
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struct pf_pdesc *, struct pf_src_node **);
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int pf_map_addr_sticky(sa_family_t, struct pf_rule *,
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struct pf_addr *, struct pf_addr *,
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struct pf_src_node **, struct pf_pool *,
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enum pf_sn_types);
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int pf_pool_states_decrease_addr(struct pf_pool *, int,
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struct pf_addr *);
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u_int64_t
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pf_hash(struct pf_addr *inaddr, struct pf_addr *hash,
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struct pf_poolhashkey *key, sa_family_t af)
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{
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uint64_t res = 0;
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#ifdef INET6
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union {
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uint64_t hash64;
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uint32_t hash32[2];
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} h;
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#endif /* INET6 */
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switch (af) {
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case AF_INET:
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res = SipHash24((SIPHASH_KEY *)key,
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&inaddr->addr32[0], sizeof(inaddr->addr32[0]));
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hash->addr32[0] = res;
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break;
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#ifdef INET6
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case AF_INET6:
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res = SipHash24((SIPHASH_KEY *)key, &inaddr->addr32[0],
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4 * sizeof(inaddr->addr32[0]));
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h.hash64 = res;
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hash->addr32[0] = h.hash32[0];
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hash->addr32[1] = h.hash32[1];
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/*
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* siphash isn't big enough, but flipping it around is
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* good enough here.
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*/
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hash->addr32[2] = ~h.hash32[1];
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hash->addr32[3] = ~h.hash32[0];
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break;
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#endif /* INET6 */
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default:
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unhandled_af(af);
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}
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return (res);
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}
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int
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pf_get_sport(struct pf_pdesc *pd, struct pf_rule *r,
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struct pf_addr *naddr, u_int16_t *nport, u_int16_t low, u_int16_t high,
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struct pf_src_node **sn)
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{
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struct pf_state_key_cmp key;
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struct pf_addr init_addr;
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u_int16_t cut;
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int dir = (pd->dir == PF_IN) ? PF_OUT : PF_IN;
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int sidx = pd->sidx;
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int didx = pd->didx;
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memset(&init_addr, 0, sizeof(init_addr));
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if (pf_map_addr(pd->naf, r, &pd->nsaddr, naddr, &init_addr, sn, &r->nat,
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PF_SN_NAT))
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return (1);
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if (pd->proto == IPPROTO_ICMP) {
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if (pd->ndport == htons(ICMP_ECHO)) {
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low = 1;
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high = 65535;
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} else
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return (0); /* Don't try to modify non-echo ICMP */
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}
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#ifdef INET6
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if (pd->proto == IPPROTO_ICMPV6) {
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if (pd->ndport == htons(ICMP6_ECHO_REQUEST)) {
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low = 1;
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high = 65535;
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} else
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return (0); /* Don't try to modify non-echo ICMP */
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}
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#endif /* INET6 */
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do {
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key.af = pd->naf;
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key.proto = pd->proto;
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key.rdomain = pd->rdomain;
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pf_addrcpy(&key.addr[didx], &pd->ndaddr, key.af);
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pf_addrcpy(&key.addr[sidx], naddr, key.af);
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key.port[didx] = pd->ndport;
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/*
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* port search; start random, step;
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* similar 2 portloop in in_pcbbind
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*/
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if (!(pd->proto == IPPROTO_TCP || pd->proto == IPPROTO_UDP ||
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pd->proto == IPPROTO_ICMP || pd->proto == IPPROTO_ICMPV6)) {
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/* XXX bug: icmp states dont use the id on both
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* XXX sides (traceroute -I through nat) */
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key.port[sidx] = pd->nsport;
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key.hash = pf_pkt_hash(key.af, key.proto, &key.addr[0],
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&key.addr[1], key.port[0], key.port[1]);
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if (pf_find_state_all(&key, dir, NULL) == NULL) {
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*nport = pd->nsport;
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return (0);
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}
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} else if (low == 0 && high == 0) {
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key.port[sidx] = pd->nsport;
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key.hash = pf_pkt_hash(key.af, key.proto, &key.addr[0],
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&key.addr[1], key.port[0], key.port[1]);
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if (pf_find_state_all(&key, dir, NULL) == NULL) {
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*nport = pd->nsport;
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return (0);
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}
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} else if (low == high) {
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key.port[sidx] = htons(low);
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key.hash = pf_pkt_hash(key.af, key.proto, &key.addr[0],
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&key.addr[1], key.port[0], key.port[1]);
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if (pf_find_state_all(&key, dir, NULL) == NULL) {
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*nport = htons(low);
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return (0);
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}
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} else {
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u_int32_t tmp;
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if (low > high) {
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tmp = low;
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low = high;
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high = tmp;
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}
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/* low < high */
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cut = arc4random_uniform(1 + high - low) + low;
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/* low <= cut <= high */
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for (tmp = cut; tmp <= high && tmp <= 0xffff; ++tmp) {
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key.port[sidx] = htons(tmp);
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key.hash = pf_pkt_hash(key.af, key.proto,
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&key.addr[0], &key.addr[1], key.port[0],
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key.port[1]);
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if (pf_find_state_all(&key, dir, NULL) ==
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NULL && !in_baddynamic(tmp, pd->proto)) {
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*nport = htons(tmp);
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return (0);
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}
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}
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tmp = cut;
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for (tmp -= 1; tmp >= low && tmp <= 0xffff; --tmp) {
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key.port[sidx] = htons(tmp);
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key.hash = pf_pkt_hash(key.af, key.proto,
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&key.addr[0], &key.addr[1], key.port[0],
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key.port[1]);
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if (pf_find_state_all(&key, dir, NULL) ==
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NULL && !in_baddynamic(tmp, pd->proto)) {
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*nport = htons(tmp);
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return (0);
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}
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}
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}
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switch (r->nat.opts & PF_POOL_TYPEMASK) {
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case PF_POOL_RANDOM:
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case PF_POOL_ROUNDROBIN:
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case PF_POOL_LEASTSTATES:
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/*
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* pick a different source address since we're out
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* of free port choices for the current one.
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*/
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if (pf_map_addr(pd->naf, r, &pd->nsaddr, naddr,
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&init_addr, sn, &r->nat, PF_SN_NAT))
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return (1);
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break;
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case PF_POOL_NONE:
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case PF_POOL_SRCHASH:
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case PF_POOL_BITMASK:
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default:
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return (1);
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}
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} while (! PF_AEQ(&init_addr, naddr, pd->naf) );
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return (1); /* none available */
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}
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int
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pf_map_addr_sticky(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr,
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struct pf_addr *naddr, struct pf_src_node **sns, struct pf_pool *rpool,
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enum pf_sn_types type)
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{
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struct pf_addr *raddr, *rmask, *cached;
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struct pf_state *s;
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struct pf_src_node k;
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int valid;
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k.af = af;
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k.type = type;
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pf_addrcpy(&k.addr, saddr, af);
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k.rule.ptr = r;
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pf_status.scounters[SCNT_SRC_NODE_SEARCH]++;
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sns[type] = RB_FIND(pf_src_tree, &tree_src_tracking, &k);
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if (sns[type] == NULL)
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return (-1);
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/* check if the cached entry is still valid */
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cached = &(sns[type])->raddr;
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valid = 0;
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if (PF_AZERO(cached, af)) {
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valid = 1;
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} else if (rpool->addr.type == PF_ADDR_DYNIFTL) {
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if (pfr_kentry_byaddr(rpool->addr.p.dyn->pfid_kt, cached,
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af, 0))
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valid = 1;
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} else if (rpool->addr.type == PF_ADDR_TABLE) {
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if (pfr_kentry_byaddr(rpool->addr.p.tbl, cached, af, 0))
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valid = 1;
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} else if (rpool->addr.type != PF_ADDR_NOROUTE) {
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raddr = &rpool->addr.v.a.addr;
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rmask = &rpool->addr.v.a.mask;
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valid = pf_match_addr(0, raddr, rmask, cached, af);
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}
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if (!valid) {
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if (pf_status.debug >= LOG_DEBUG) {
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log(LOG_DEBUG, "pf: pf_map_addr: "
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"stale src tracking (%u) ", type);
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pf_print_host(&k.addr, 0, af);
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addlog(" to ");
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pf_print_host(cached, 0, af);
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addlog("\n");
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}
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if (sns[type]->states != 0) {
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/* XXX expensive */
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RBT_FOREACH(s, pf_state_tree_id, &tree_id)
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pf_state_rm_src_node(s, sns[type]);
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}
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sns[type]->expire = 1;
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pf_remove_src_node(sns[type]);
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sns[type] = NULL;
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return (-1);
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}
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if (!PF_AZERO(cached, af)) {
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pf_addrcpy(naddr, cached, af);
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if ((rpool->opts & PF_POOL_TYPEMASK) == PF_POOL_LEASTSTATES &&
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pf_map_addr_states_increase(af, rpool, cached) == -1)
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return (-1);
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}
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if (pf_status.debug >= LOG_DEBUG) {
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log(LOG_DEBUG, "pf: pf_map_addr: "
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"src tracking (%u) maps ", type);
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pf_print_host(&k.addr, 0, af);
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addlog(" to ");
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pf_print_host(naddr, 0, af);
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addlog("\n");
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}
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if (sns[type]->kif != NULL)
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rpool->kif = sns[type]->kif;
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return (0);
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}
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uint32_t
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pf_rand_addr(uint32_t mask)
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{
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uint32_t addr;
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mask = ~ntohl(mask);
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addr = arc4random_uniform(mask + 1);
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return (htonl(addr));
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}
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int
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pf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr,
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struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sns,
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struct pf_pool *rpool, enum pf_sn_types type)
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{
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struct pf_addr hash;
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struct pf_addr faddr;
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struct pf_addr *raddr = &rpool->addr.v.a.addr;
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struct pf_addr *rmask = &rpool->addr.v.a.mask;
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struct pfr_ktable *kt;
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struct pfi_kif *kif;
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u_int64_t states;
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u_int16_t weight;
|
||||
u_int64_t load;
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u_int64_t cload;
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u_int64_t hashidx;
|
||||
int cnt;
|
||||
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||||
if (sns[type] == NULL && rpool->opts & PF_POOL_STICKYADDR &&
|
||||
(rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE &&
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||||
pf_map_addr_sticky(af, r, saddr, naddr, sns, rpool, type) == 0)
|
||||
return (0);
|
||||
|
||||
if (rpool->addr.type == PF_ADDR_NOROUTE)
|
||||
return (1);
|
||||
if (rpool->addr.type == PF_ADDR_DYNIFTL) {
|
||||
switch (af) {
|
||||
case AF_INET:
|
||||
if (rpool->addr.p.dyn->pfid_acnt4 < 1 &&
|
||||
!PF_POOL_DYNTYPE(rpool->opts))
|
||||
return (1);
|
||||
raddr = &rpool->addr.p.dyn->pfid_addr4;
|
||||
rmask = &rpool->addr.p.dyn->pfid_mask4;
|
||||
break;
|
||||
#ifdef INET6
|
||||
case AF_INET6:
|
||||
if (rpool->addr.p.dyn->pfid_acnt6 < 1 &&
|
||||
!PF_POOL_DYNTYPE(rpool->opts))
|
||||
return (1);
|
||||
raddr = &rpool->addr.p.dyn->pfid_addr6;
|
||||
rmask = &rpool->addr.p.dyn->pfid_mask6;
|
||||
break;
|
||||
#endif /* INET6 */
|
||||
default:
|
||||
unhandled_af(af);
|
||||
}
|
||||
} else if (rpool->addr.type == PF_ADDR_TABLE) {
|
||||
if (!PF_POOL_DYNTYPE(rpool->opts))
|
||||
return (1); /* unsupported */
|
||||
} else {
|
||||
raddr = &rpool->addr.v.a.addr;
|
||||
rmask = &rpool->addr.v.a.mask;
|
||||
}
|
||||
|
||||
switch (rpool->opts & PF_POOL_TYPEMASK) {
|
||||
case PF_POOL_NONE:
|
||||
pf_addrcpy(naddr, raddr, af);
|
||||
break;
|
||||
case PF_POOL_BITMASK:
|
||||
pf_poolmask(naddr, raddr, rmask, saddr, af);
|
||||
break;
|
||||
case PF_POOL_RANDOM:
|
||||
if (rpool->addr.type == PF_ADDR_TABLE ||
|
||||
rpool->addr.type == PF_ADDR_DYNIFTL) {
|
||||
if (rpool->addr.type == PF_ADDR_TABLE)
|
||||
kt = rpool->addr.p.tbl;
|
||||
else
|
||||
kt = rpool->addr.p.dyn->pfid_kt;
|
||||
kt = pfr_ktable_select_active(kt);
|
||||
if (kt == NULL)
|
||||
return (1);
|
||||
|
||||
cnt = kt->pfrkt_cnt;
|
||||
if (cnt == 0)
|
||||
rpool->tblidx = 0;
|
||||
else
|
||||
rpool->tblidx = (int)arc4random_uniform(cnt);
|
||||
memset(&rpool->counter, 0, sizeof(rpool->counter));
|
||||
if (pfr_pool_get(rpool, &raddr, &rmask, af))
|
||||
return (1);
|
||||
pf_addrcpy(naddr, &rpool->counter, af);
|
||||
} else if (init_addr != NULL && PF_AZERO(init_addr, af)) {
|
||||
switch (af) {
|
||||
case AF_INET:
|
||||
rpool->counter.addr32[0] = pf_rand_addr(
|
||||
rmask->addr32[0]);
|
||||
break;
|
||||
#ifdef INET6
|
||||
case AF_INET6:
|
||||
if (rmask->addr32[3] != 0xffffffff)
|
||||
rpool->counter.addr32[3] = pf_rand_addr(
|
||||
rmask->addr32[3]);
|
||||
else
|
||||
break;
|
||||
if (rmask->addr32[2] != 0xffffffff)
|
||||
rpool->counter.addr32[2] = pf_rand_addr(
|
||||
rmask->addr32[2]);
|
||||
else
|
||||
break;
|
||||
if (rmask->addr32[1] != 0xffffffff)
|
||||
rpool->counter.addr32[1] = pf_rand_addr(
|
||||
rmask->addr32[1]);
|
||||
else
|
||||
break;
|
||||
if (rmask->addr32[0] != 0xffffffff)
|
||||
rpool->counter.addr32[0] = pf_rand_addr(
|
||||
rmask->addr32[0]);
|
||||
break;
|
||||
#endif /* INET6 */
|
||||
default:
|
||||
unhandled_af(af);
|
||||
}
|
||||
pf_poolmask(naddr, raddr, rmask, &rpool->counter, af);
|
||||
pf_addrcpy(init_addr, naddr, af);
|
||||
|
||||
} else {
|
||||
pf_addr_inc(&rpool->counter, af);
|
||||
pf_poolmask(naddr, raddr, rmask, &rpool->counter, af);
|
||||
}
|
||||
break;
|
||||
case PF_POOL_SRCHASH:
|
||||
hashidx = pf_hash(saddr, &hash, &rpool->key, af);
|
||||
|
||||
if (rpool->addr.type == PF_ADDR_TABLE ||
|
||||
rpool->addr.type == PF_ADDR_DYNIFTL) {
|
||||
if (rpool->addr.type == PF_ADDR_TABLE)
|
||||
kt = rpool->addr.p.tbl;
|
||||
else
|
||||
kt = rpool->addr.p.dyn->pfid_kt;
|
||||
kt = pfr_ktable_select_active(kt);
|
||||
if (kt == NULL)
|
||||
return (1);
|
||||
|
||||
cnt = kt->pfrkt_cnt;
|
||||
if (cnt == 0)
|
||||
rpool->tblidx = 0;
|
||||
else
|
||||
rpool->tblidx = (int)(hashidx % cnt);
|
||||
memset(&rpool->counter, 0, sizeof(rpool->counter));
|
||||
if (pfr_pool_get(rpool, &raddr, &rmask, af))
|
||||
return (1);
|
||||
pf_addrcpy(naddr, &rpool->counter, af);
|
||||
} else {
|
||||
pf_poolmask(naddr, raddr, rmask, &hash, af);
|
||||
}
|
||||
break;
|
||||
case PF_POOL_ROUNDROBIN:
|
||||
if (rpool->addr.type == PF_ADDR_TABLE ||
|
||||
rpool->addr.type == PF_ADDR_DYNIFTL) {
|
||||
if (pfr_pool_get(rpool, &raddr, &rmask, af)) {
|
||||
/*
|
||||
* reset counter in case its value
|
||||
* has been removed from the pool.
|
||||
*/
|
||||
memset(&rpool->counter, 0,
|
||||
sizeof(rpool->counter));
|
||||
if (pfr_pool_get(rpool, &raddr, &rmask, af))
|
||||
return (1);
|
||||
}
|
||||
} else if (PF_AZERO(&rpool->counter, af)) {
|
||||
/*
|
||||
* fall back to POOL_NONE if there is a single host
|
||||
* address in pool.
|
||||
*/
|
||||
if (af == AF_INET &&
|
||||
rmask->addr32[0] == INADDR_BROADCAST) {
|
||||
pf_addrcpy(naddr, raddr, af);
|
||||
break;
|
||||
}
|
||||
#ifdef INET6
|
||||
if (af == AF_INET6 &&
|
||||
IN6_ARE_ADDR_EQUAL(&rmask->v6, &in6mask128)) {
|
||||
pf_addrcpy(naddr, raddr, af);
|
||||
break;
|
||||
}
|
||||
#endif
|
||||
} else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af))
|
||||
return (1);
|
||||
|
||||
/* iterate over table if it contains entries which are weighted */
|
||||
if ((rpool->addr.type == PF_ADDR_TABLE &&
|
||||
rpool->addr.p.tbl->pfrkt_refcntcost > 0) ||
|
||||
(rpool->addr.type == PF_ADDR_DYNIFTL &&
|
||||
rpool->addr.p.dyn->pfid_kt->pfrkt_refcntcost > 0)) {
|
||||
do {
|
||||
if (rpool->addr.type == PF_ADDR_TABLE ||
|
||||
rpool->addr.type == PF_ADDR_DYNIFTL) {
|
||||
if (pfr_pool_get(rpool,
|
||||
&raddr, &rmask, af))
|
||||
return (1);
|
||||
} else {
|
||||
log(LOG_ERR, "pf: pf_map_addr: "
|
||||
"weighted RR failure");
|
||||
return (1);
|
||||
}
|
||||
if (rpool->weight >= rpool->curweight)
|
||||
break;
|
||||
pf_addr_inc(&rpool->counter, af);
|
||||
} while (1);
|
||||
|
||||
weight = rpool->weight;
|
||||
}
|
||||
|
||||
pf_poolmask(naddr, raddr, rmask, &rpool->counter, af);
|
||||
if (init_addr != NULL && PF_AZERO(init_addr, af))
|
||||
pf_addrcpy(init_addr, &rpool->counter, af);
|
||||
pf_addr_inc(&rpool->counter, af);
|
||||
break;
|
||||
case PF_POOL_LEASTSTATES:
|
||||
/* retrieve an address first */
|
||||
if (rpool->addr.type == PF_ADDR_TABLE ||
|
||||
rpool->addr.type == PF_ADDR_DYNIFTL) {
|
||||
if (pfr_pool_get(rpool, &raddr, &rmask, af)) {
|
||||
/* see PF_POOL_ROUNDROBIN */
|
||||
memset(&rpool->counter, 0,
|
||||
sizeof(rpool->counter));
|
||||
if (pfr_pool_get(rpool, &raddr, &rmask, af))
|
||||
return (1);
|
||||
}
|
||||
} else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af))
|
||||
return (1);
|
||||
|
||||
states = rpool->states;
|
||||
weight = rpool->weight;
|
||||
kif = rpool->kif;
|
||||
|
||||
if ((rpool->addr.type == PF_ADDR_TABLE &&
|
||||
rpool->addr.p.tbl->pfrkt_refcntcost > 0) ||
|
||||
(rpool->addr.type == PF_ADDR_DYNIFTL &&
|
||||
rpool->addr.p.dyn->pfid_kt->pfrkt_refcntcost > 0))
|
||||
load = ((UINT16_MAX * rpool->states) / rpool->weight);
|
||||
else
|
||||
load = states;
|
||||
|
||||
pf_addrcpy(&faddr, &rpool->counter, af);
|
||||
|
||||
pf_addrcpy(naddr, &rpool->counter, af);
|
||||
if (init_addr != NULL && PF_AZERO(init_addr, af))
|
||||
pf_addrcpy(init_addr, naddr, af);
|
||||
|
||||
/*
|
||||
* iterate *once* over whole table and find destination with
|
||||
* least connection
|
||||
*/
|
||||
do {
|
||||
pf_addr_inc(&rpool->counter, af);
|
||||
if (rpool->addr.type == PF_ADDR_TABLE ||
|
||||
rpool->addr.type == PF_ADDR_DYNIFTL) {
|
||||
if (pfr_pool_get(rpool, &raddr, &rmask, af))
|
||||
return (1);
|
||||
} else if (pf_match_addr(0, raddr, rmask,
|
||||
&rpool->counter, af))
|
||||
return (1);
|
||||
|
||||
if ((rpool->addr.type == PF_ADDR_TABLE &&
|
||||
rpool->addr.p.tbl->pfrkt_refcntcost > 0) ||
|
||||
(rpool->addr.type == PF_ADDR_DYNIFTL &&
|
||||
rpool->addr.p.dyn->pfid_kt->pfrkt_refcntcost > 0))
|
||||
cload = ((UINT16_MAX * rpool->states)
|
||||
/ rpool->weight);
|
||||
else
|
||||
cload = rpool->states;
|
||||
|
||||
/* find lc minimum */
|
||||
if (cload < load) {
|
||||
states = rpool->states;
|
||||
weight = rpool->weight;
|
||||
kif = rpool->kif;
|
||||
load = cload;
|
||||
|
||||
pf_addrcpy(naddr, &rpool->counter, af);
|
||||
if (init_addr != NULL &&
|
||||
PF_AZERO(init_addr, af))
|
||||
pf_addrcpy(init_addr, naddr, af);
|
||||
}
|
||||
} while (pf_match_addr(1, &faddr, rmask, &rpool->counter, af) &&
|
||||
(states > 0));
|
||||
|
||||
if (pf_map_addr_states_increase(af, rpool, naddr) == -1)
|
||||
return (1);
|
||||
/* revert the kif which was set by pfr_pool_get() */
|
||||
rpool->kif = kif;
|
||||
break;
|
||||
}
|
||||
|
||||
if (rpool->opts & PF_POOL_STICKYADDR) {
|
||||
if (sns[type] != NULL) {
|
||||
pf_remove_src_node(sns[type]);
|
||||
sns[type] = NULL;
|
||||
}
|
||||
if (pf_insert_src_node(&sns[type], r, type, af, saddr, naddr,
|
||||
rpool->kif))
|
||||
return (1);
|
||||
}
|
||||
|
||||
if (pf_status.debug >= LOG_INFO &&
|
||||
(rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
|
||||
log(LOG_INFO, "pf: pf_map_addr: selected address ");
|
||||
pf_print_host(naddr, 0, af);
|
||||
if ((rpool->opts & PF_POOL_TYPEMASK) ==
|
||||
PF_POOL_LEASTSTATES)
|
||||
addlog(" with state count %llu", states);
|
||||
if ((rpool->addr.type == PF_ADDR_TABLE &&
|
||||
rpool->addr.p.tbl->pfrkt_refcntcost > 0) ||
|
||||
(rpool->addr.type == PF_ADDR_DYNIFTL &&
|
||||
rpool->addr.p.dyn->pfid_kt->pfrkt_refcntcost > 0))
|
||||
addlog(" with weight %u", weight);
|
||||
addlog("\n");
|
||||
}
|
||||
|
||||
return (0);
|
||||
}
|
||||
|
||||
int
|
||||
pf_map_addr_states_increase(sa_family_t af, struct pf_pool *rpool,
|
||||
struct pf_addr *naddr)
|
||||
{
|
||||
if (rpool->addr.type == PF_ADDR_TABLE) {
|
||||
if (pfr_states_increase(rpool->addr.p.tbl,
|
||||
naddr, af) == -1) {
|
||||
if (pf_status.debug >= LOG_DEBUG) {
|
||||
log(LOG_DEBUG,
|
||||
"pf: pf_map_addr_states_increase: "
|
||||
"selected address ");
|
||||
pf_print_host(naddr, 0, af);
|
||||
addlog(". Failed to increase count!\n");
|
||||
}
|
||||
return (-1);
|
||||
}
|
||||
} else if (rpool->addr.type == PF_ADDR_DYNIFTL) {
|
||||
if (pfr_states_increase(rpool->addr.p.dyn->pfid_kt,
|
||||
naddr, af) == -1) {
|
||||
if (pf_status.debug >= LOG_DEBUG) {
|
||||
log(LOG_DEBUG,
|
||||
"pf: pf_map_addr_states_increase: "
|
||||
"selected address ");
|
||||
pf_print_host(naddr, 0, af);
|
||||
addlog(". Failed to increase count!\n");
|
||||
}
|
||||
return (-1);
|
||||
}
|
||||
}
|
||||
return (0);
|
||||
}
|
||||
|
||||
int
|
||||
pf_get_transaddr(struct pf_rule *r, struct pf_pdesc *pd,
|
||||
struct pf_src_node **sns, struct pf_rule **nr)
|
||||
{
|
||||
struct pf_addr naddr;
|
||||
u_int16_t nport;
|
||||
|
||||
#ifdef INET6
|
||||
if (pd->af != pd->naf)
|
||||
return (pf_get_transaddr_af(r, pd, sns));
|
||||
#endif /* INET6 */
|
||||
|
||||
if (r->nat.addr.type != PF_ADDR_NONE) {
|
||||
/* XXX is this right? what if rtable is changed at the same
|
||||
* XXX time? where do I need to figure out the sport? */
|
||||
nport = 0;
|
||||
if (pf_get_sport(pd, r, &naddr, &nport,
|
||||
r->nat.proxy_port[0], r->nat.proxy_port[1], sns)) {
|
||||
DPFPRINTF(LOG_NOTICE,
|
||||
"pf: NAT proxy port allocation (%u-%u) failed",
|
||||
r->nat.proxy_port[0],
|
||||
r->nat.proxy_port[1]);
|
||||
return (-1);
|
||||
}
|
||||
/* decrease least-connection state counter of the previous */
|
||||
if ((*nr) != NULL && (*nr)->nat.addr.type != PF_ADDR_NONE &&
|
||||
((*nr)->nat.opts & PF_POOL_TYPEMASK) ==
|
||||
PF_POOL_LEASTSTATES)
|
||||
pf_pool_states_decrease_addr(&(*nr)->nat, pd->af,
|
||||
&pd->nsaddr);
|
||||
*nr = r;
|
||||
pf_addrcpy(&pd->nsaddr, &naddr, pd->af);
|
||||
pd->nsport = nport;
|
||||
}
|
||||
if (r->rdr.addr.type != PF_ADDR_NONE) {
|
||||
if (pf_map_addr(pd->af, r, &pd->nsaddr, &naddr, NULL, sns,
|
||||
&r->rdr, PF_SN_RDR))
|
||||
return (-1);
|
||||
if ((r->rdr.opts & PF_POOL_TYPEMASK) == PF_POOL_BITMASK)
|
||||
pf_poolmask(&naddr, &naddr, &r->rdr.addr.v.a.mask,
|
||||
&pd->ndaddr, pd->af);
|
||||
|
||||
nport = 0;
|
||||
if (r->rdr.proxy_port[1]) {
|
||||
u_int32_t tmp_nport;
|
||||
u_int16_t div;
|
||||
|
||||
div = r->rdr.proxy_port[1] - r->rdr.proxy_port[0] + 1;
|
||||
div = (div == 0) ? 1 : div;
|
||||
|
||||
tmp_nport = ((ntohs(pd->ndport) - ntohs(r->dst.port[0])) % div) +
|
||||
r->rdr.proxy_port[0];
|
||||
|
||||
/* wrap around if necessary */
|
||||
if (tmp_nport > 65535)
|
||||
tmp_nport -= 65535;
|
||||
nport = htons((u_int16_t)tmp_nport);
|
||||
} else if (r->rdr.proxy_port[0])
|
||||
nport = htons(r->rdr.proxy_port[0]);
|
||||
/* decrease least-connection state counter of the previous */
|
||||
if ((*nr) != NULL && (*nr)->rdr.addr.type != PF_ADDR_NONE &&
|
||||
((*nr)->rdr.opts & PF_POOL_TYPEMASK) ==
|
||||
PF_POOL_LEASTSTATES)
|
||||
pf_pool_states_decrease_addr(&(*nr)->rdr, pd->af,
|
||||
&pd->ndaddr);
|
||||
*nr = r;
|
||||
pf_addrcpy(&pd->ndaddr, &naddr, pd->af);
|
||||
if (nport)
|
||||
pd->ndport = nport;
|
||||
}
|
||||
|
||||
return (0);
|
||||
}
|
||||
|
||||
#ifdef INET6
|
||||
int
|
||||
pf_get_transaddr_af(struct pf_rule *r, struct pf_pdesc *pd,
|
||||
struct pf_src_node **sns)
|
||||
{
|
||||
struct pf_addr ndaddr, nsaddr, naddr;
|
||||
u_int16_t nport;
|
||||
int prefixlen = 96;
|
||||
|
||||
if (pf_status.debug >= LOG_INFO) {
|
||||
log(LOG_INFO, "pf: af-to %s %s, ",
|
||||
pd->naf == AF_INET ? "inet" : "inet6",
|
||||
r->rdr.addr.type == PF_ADDR_NONE ? "nat" : "rdr");
|
||||
pf_print_host(&pd->nsaddr, pd->nsport, pd->af);
|
||||
addlog(" -> ");
|
||||
pf_print_host(&pd->ndaddr, pd->ndport, pd->af);
|
||||
addlog("\n");
|
||||
}
|
||||
|
||||
if (r->nat.addr.type == PF_ADDR_NONE)
|
||||
panic("pf_get_transaddr_af: no nat pool for source address");
|
||||
|
||||
/* get source address and port */
|
||||
nport = 0;
|
||||
if (pf_get_sport(pd, r, &nsaddr, &nport,
|
||||
r->nat.proxy_port[0], r->nat.proxy_port[1], sns)) {
|
||||
DPFPRINTF(LOG_NOTICE,
|
||||
"pf: af-to NAT proxy port allocation (%u-%u) failed",
|
||||
r->nat.proxy_port[0],
|
||||
r->nat.proxy_port[1]);
|
||||
return (-1);
|
||||
}
|
||||
pd->nsport = nport;
|
||||
|
||||
if (pd->proto == IPPROTO_ICMPV6 && pd->naf == AF_INET) {
|
||||
if (pd->dir == PF_IN) {
|
||||
pd->ndport = ntohs(pd->ndport);
|
||||
if (pd->ndport == ICMP6_ECHO_REQUEST)
|
||||
pd->ndport = ICMP_ECHO;
|
||||
else if (pd->ndport == ICMP6_ECHO_REPLY)
|
||||
pd->ndport = ICMP_ECHOREPLY;
|
||||
pd->ndport = htons(pd->ndport);
|
||||
} else {
|
||||
pd->nsport = ntohs(pd->nsport);
|
||||
if (pd->nsport == ICMP6_ECHO_REQUEST)
|
||||
pd->nsport = ICMP_ECHO;
|
||||
else if (pd->nsport == ICMP6_ECHO_REPLY)
|
||||
pd->nsport = ICMP_ECHOREPLY;
|
||||
pd->nsport = htons(pd->nsport);
|
||||
}
|
||||
} else if (pd->proto == IPPROTO_ICMP && pd->naf == AF_INET6) {
|
||||
if (pd->dir == PF_IN) {
|
||||
pd->ndport = ntohs(pd->ndport);
|
||||
if (pd->ndport == ICMP_ECHO)
|
||||
pd->ndport = ICMP6_ECHO_REQUEST;
|
||||
else if (pd->ndport == ICMP_ECHOREPLY)
|
||||
pd->ndport = ICMP6_ECHO_REPLY;
|
||||
pd->ndport = htons(pd->ndport);
|
||||
} else {
|
||||
pd->nsport = ntohs(pd->nsport);
|
||||
if (pd->nsport == ICMP_ECHO)
|
||||
pd->nsport = ICMP6_ECHO_REQUEST;
|
||||
else if (pd->nsport == ICMP_ECHOREPLY)
|
||||
pd->nsport = ICMP6_ECHO_REPLY;
|
||||
pd->nsport = htons(pd->nsport);
|
||||
}
|
||||
}
|
||||
|
||||
/* get the destination address and port */
|
||||
if (r->rdr.addr.type != PF_ADDR_NONE) {
|
||||
if (pf_map_addr(pd->naf, r, &nsaddr, &naddr, NULL, sns,
|
||||
&r->rdr, PF_SN_RDR))
|
||||
return (-1);
|
||||
if (r->rdr.proxy_port[0])
|
||||
pd->ndport = htons(r->rdr.proxy_port[0]);
|
||||
|
||||
if (pd->naf == AF_INET) {
|
||||
/* The prefix is the IPv4 rdr address */
|
||||
prefixlen = in_mask2len((struct in_addr *)
|
||||
&r->rdr.addr.v.a.mask);
|
||||
inet_nat46(pd->naf, &pd->ndaddr,
|
||||
&ndaddr, &naddr, prefixlen);
|
||||
} else {
|
||||
/* The prefix is the IPv6 rdr address */
|
||||
prefixlen =
|
||||
in6_mask2len((struct in6_addr *)
|
||||
&r->rdr.addr.v.a.mask, NULL);
|
||||
inet_nat64(pd->naf, &pd->ndaddr,
|
||||
&ndaddr, &naddr, prefixlen);
|
||||
}
|
||||
} else {
|
||||
if (pd->naf == AF_INET) {
|
||||
/* The prefix is the IPv6 dst address */
|
||||
prefixlen =
|
||||
in6_mask2len((struct in6_addr *)
|
||||
&r->dst.addr.v.a.mask, NULL);
|
||||
if (prefixlen < 32)
|
||||
prefixlen = 96;
|
||||
inet_nat64(pd->naf, &pd->ndaddr,
|
||||
&ndaddr, &pd->ndaddr, prefixlen);
|
||||
} else {
|
||||
/*
|
||||
* The prefix is the IPv6 nat address
|
||||
* (that was stored in pd->nsaddr)
|
||||
*/
|
||||
prefixlen = in6_mask2len((struct in6_addr *)
|
||||
&r->nat.addr.v.a.mask, NULL);
|
||||
if (prefixlen > 96)
|
||||
prefixlen = 96;
|
||||
inet_nat64(pd->naf, &pd->ndaddr,
|
||||
&ndaddr, &nsaddr, prefixlen);
|
||||
}
|
||||
}
|
||||
|
||||
pf_addrcpy(&pd->nsaddr, &nsaddr, pd->naf);
|
||||
pf_addrcpy(&pd->ndaddr, &ndaddr, pd->naf);
|
||||
|
||||
if (pf_status.debug >= LOG_INFO) {
|
||||
log(LOG_INFO, "pf: af-to %s %s done, prefixlen %d, ",
|
||||
pd->naf == AF_INET ? "inet" : "inet6",
|
||||
r->rdr.addr.type == PF_ADDR_NONE ? "nat" : "rdr",
|
||||
prefixlen);
|
||||
pf_print_host(&pd->nsaddr, pd->nsport, pd->naf);
|
||||
addlog(" -> ");
|
||||
pf_print_host(&pd->ndaddr, pd->ndport, pd->naf);
|
||||
addlog("\n");
|
||||
}
|
||||
|
||||
return (0);
|
||||
}
|
||||
#endif /* INET6 */
|
||||
|
||||
int
|
||||
pf_postprocess_addr(struct pf_state *cur)
|
||||
{
|
||||
struct pf_state_key *sks;
|
||||
struct pf_addr *addr;
|
||||
struct pf_pool *rpool, *natpl = NULL, *rdrpl = NULL;
|
||||
struct pf_rule_item *ri;
|
||||
int ret = 0;
|
||||
|
||||
/* decrease the states counter in pool for "least-states" */
|
||||
if (cur->natrule.ptr != NULL) { /* this is the final */
|
||||
if (cur->natrule.ptr->nat.addr.type != PF_ADDR_NONE)
|
||||
natpl = &cur->natrule.ptr->nat;
|
||||
if (cur->natrule.ptr->rdr.addr.type != PF_ADDR_NONE)
|
||||
rdrpl = &cur->natrule.ptr->rdr;
|
||||
}
|
||||
if (natpl == NULL || rdrpl == NULL) {
|
||||
/* nat or rdr might be done by a previous "match" */
|
||||
SLIST_FOREACH(ri, &cur->match_rules, entry) {
|
||||
/* first match since the list order is reversed */
|
||||
if (natpl == NULL &&
|
||||
ri->r->nat.addr.type != PF_ADDR_NONE)
|
||||
natpl = &ri->r->nat;
|
||||
if (rdrpl == NULL &&
|
||||
ri->r->rdr.addr.type != PF_ADDR_NONE)
|
||||
rdrpl = &ri->r->rdr;
|
||||
if (natpl != NULL && rdrpl != NULL)
|
||||
break;
|
||||
}
|
||||
}
|
||||
if (natpl != NULL &&
|
||||
(natpl->opts & PF_POOL_TYPEMASK) == PF_POOL_LEASTSTATES) {
|
||||
/* nat-to <table> least-state */
|
||||
if (cur->direction == PF_IN) {
|
||||
sks = cur->key[PF_SK_STACK];
|
||||
addr = &sks->addr[0];
|
||||
} else {
|
||||
sks = cur->key[PF_SK_WIRE];
|
||||
addr = &sks->addr[1];
|
||||
}
|
||||
if (pf_pool_states_decrease_addr(natpl, sks->af, addr) != 0)
|
||||
ret = 1;
|
||||
}
|
||||
if (rdrpl != NULL &&
|
||||
(rdrpl->opts & PF_POOL_TYPEMASK) == PF_POOL_LEASTSTATES) {
|
||||
/* rdr <table> least-state */
|
||||
if (cur->direction == PF_IN) {
|
||||
sks = cur->key[PF_SK_STACK];
|
||||
addr = &sks->addr[1];
|
||||
} else {
|
||||
sks = cur->key[PF_SK_WIRE];
|
||||
addr = &sks->addr[0];
|
||||
}
|
||||
if (pf_pool_states_decrease_addr(rdrpl, sks->af, addr) != 0)
|
||||
ret = 1;
|
||||
}
|
||||
if (cur->rule.ptr != NULL) {
|
||||
/* route-to <table> least-state */
|
||||
rpool = &cur->rule.ptr->route;
|
||||
if (rpool->addr.type != PF_ADDR_NONE &&
|
||||
(rpool->opts & PF_POOL_TYPEMASK) == PF_POOL_LEASTSTATES) {
|
||||
sks = cur->key[(cur->direction == PF_IN)
|
||||
? PF_SK_STACK : PF_SK_WIRE];
|
||||
addr = &cur->rt_addr;
|
||||
KASSERT(sks != NULL);
|
||||
if (pf_pool_states_decrease_addr(rpool, sks->af, addr)
|
||||
!= 0)
|
||||
ret = 1;
|
||||
}
|
||||
}
|
||||
|
||||
return (ret);
|
||||
}
|
||||
|
||||
int
|
||||
pf_pool_states_decrease_addr(struct pf_pool *rpool, int af,
|
||||
struct pf_addr *addr)
|
||||
{
|
||||
int slbcount = -1;
|
||||
|
||||
if (rpool->addr.type == PF_ADDR_TABLE) {
|
||||
if ((slbcount = pfr_states_decrease(
|
||||
rpool->addr.p.tbl, addr, af)) == -1) {
|
||||
if (pf_status.debug >= LOG_DEBUG) {
|
||||
log(LOG_DEBUG, "pf: %s: selected address ",
|
||||
__func__);
|
||||
pf_print_host(addr, 0, af);
|
||||
addlog(". Failed to "
|
||||
"decrease count!\n");
|
||||
}
|
||||
return (1);
|
||||
}
|
||||
} else if (rpool->addr.type == PF_ADDR_DYNIFTL) {
|
||||
if ((slbcount = pfr_states_decrease(
|
||||
rpool->addr.p.dyn->pfid_kt, addr, af)) == -1) {
|
||||
if (pf_status.debug >= LOG_DEBUG) {
|
||||
log(LOG_DEBUG, "pf: %s: selected address ",
|
||||
__func__);
|
||||
pf_print_host(addr, 0, af);
|
||||
addlog(". Failed to "
|
||||
"decrease count!\n");
|
||||
}
|
||||
return (1);
|
||||
}
|
||||
}
|
||||
if (slbcount > -1) {
|
||||
if (pf_status.debug >= LOG_INFO) {
|
||||
log(LOG_INFO, "pf: %s: selected address ", __func__);
|
||||
pf_print_host(addr, 0, af);
|
||||
addlog(" decreased state count to %u\n",
|
||||
slbcount);
|
||||
}
|
||||
}
|
||||
|
||||
return (0);
|
||||
}
|
||||
Reference in new issue
Block a user