1: /*-
2: * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3: *
4: * Copyright (c) 2022 Michael Pounov <misho@elwix.org>, CloudSigma AG
5: *
6: * Redistribution and use in source and binary forms, with or without
7: * modification, are permitted provided that the following conditions
8: * are met:
9: * 1. Redistributions of source code must retain the above copyright
10: * notice, this list of conditions and the following disclaimer.
11: * 2. Redistributions in binary form must reproduce the above copyright
12: * notice, this list of conditions and the following disclaimer in the
13: * documentation and/or other materials provided with the distribution.
14: *
15: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25: * SUCH DAMAGE.
26: */
27: #include "fwsync.h"
28:
29:
30: int
31: fwsync_add_state(const struct fws_proto *pkt)
32: {
33: struct fws_sndpkt *p;
34:
35: DTRACE();
36:
37: if (!pkt || pkt->fws_addrtype == 1)
38: return 0; /* skip ethernet packet */
39:
40: p = malloc(sizeof(struct fws_sndpkt), M_FWSYNC, M_NOWAIT | M_ZERO);
41: if (!p) {
42: return ENOMEM;
43: } else
44: memcpy(&p->sp_proto, pkt, sizeof(struct fws_proto));
45:
46: mtx_lock(&fws_mtx_u);
47: TAILQ_INSERT_TAIL(&fwsync_updpkt, p, sp_next);
48: mtx_unlock(&fws_mtx_u);
49: return 0;
50: }
51:
52:
53: int
54: fwsync_add_alias(const struct fws_proto *pkt)
55: {
56: struct fws_sndpkt *p;
57:
58: DTRACE();
59:
60: if (!pkt || pkt->fws_addrtype == 1)
61: return 0; /* skip ethernet packet */
62:
63: p = malloc(sizeof(struct fws_sndpkt), M_FWSYNC, M_NOWAIT | M_ZERO);
64: if (!p) {
65: return ENOMEM;
66: } else
67: memcpy(&p->sp_proto, pkt, sizeof(struct fws_proto));
68:
69: mtx_lock(&fws_mtx_n);
70: TAILQ_INSERT_TAIL(&fwsync_natpkt, p, sp_next);
71: mtx_unlock(&fws_mtx_n);
72: return 0;
73: }
74:
75:
76: void
77: fwsync_sndpkt_handler(void *context, int pending)
78: {
79: struct fws_sndpkt *pkt;
80: struct mbuf *m2, *m;
81: int e;
82:
83: DTRACE();
84:
85: do {
86: mtx_lock(&fws_mtx_c);
87: pkt = TAILQ_FIRST(&fwsync_sndpkt);
88: if (pkt)
89: TAILQ_REMOVE(&fwsync_sndpkt, pkt, sp_next);
90: mtx_unlock(&fws_mtx_c);
91:
92: if (!pkt) /* sending queue is empty */
93: break;
94:
95: if (!(fws_cfg.cfg.on & CFG_SYNC_COLLECTOR)) {
96: free(pkt, M_FWSYNC);
97: continue;
98: }
99:
100: m = m_gethdr(M_NOWAIT, MT_DATA);
101: if (!m) {
102: free(pkt, M_FWSYNC);
103: continue;
104: }
105:
106: memcpy(mtod(m, struct fws_proto *), &pkt->sp_proto, sizeof pkt->sp_proto);
107: m->m_len = sizeof pkt->sp_proto;
108: m_fixhdr(m);
109:
110: if ((fws_ctx.config & (CTX_COLLECTOR_2_ONLINE | CTX_COLLECTOR_2_READY)) ==
111: (CTX_COLLECTOR_2_ONLINE | CTX_COLLECTOR_2_READY)) {
112: m2 = m_copypacket(m, M_NOWAIT);
113: if (!m2) {
114: printf("error in copypacket for second collector\n");
115: goto out;
116: }
117: e = sosend(fws_ctx.sockz[CFG_SYNC_ADDR_COLLECTOR_2],
118: &fws_cfg.cfg_addr[CFG_SYNC_ADDR_COLLECTOR_2].addr, NULL,
119: m2, NULL, 0, curthread);
120: if (e && e != EAGAIN)
121: printf("error in collector %d handler #%d\n", CFG_SYNC_ADDR_COLLECTOR_2, e);
122: }
123:
124: if ((fws_ctx.config & (CTX_COLLECTOR_1_ONLINE | CTX_COLLECTOR_1_READY)) ==
125: (CTX_COLLECTOR_1_ONLINE | CTX_COLLECTOR_1_READY)) {
126: m2 = m_copypacket(m, M_NOWAIT);
127: if (!m2) {
128: printf("error in copypacket for first collector\n");
129: goto out;
130: }
131: e = sosend(fws_ctx.sockz[CFG_SYNC_ADDR_COLLECTOR_1],
132: &fws_cfg.cfg_addr[CFG_SYNC_ADDR_COLLECTOR_1].addr, NULL,
133: m2, NULL, 0, curthread);
134: if (e && e != EAGAIN)
135: printf("error in collector %d handler #%d\n", CFG_SYNC_ADDR_COLLECTOR_1, e);
136: }
137: out:
138: m_freem(m);
139: free(pkt, M_FWSYNC);
140: } while (--pending);
141: }
142:
143: int
144: fwsync_state_handler(const void *arg, const void *extdata)
145: {
146: const struct ipfw_flow_id *pkt = arg;
147: const struct ipfw_dyn_hook_extdata *edata = extdata;
148: struct fws_proto *spkt;
149: struct fws_sndpkt *p;
150:
151: DTRACE();
152:
153: if (!pkt || pkt->addr_type == 1)
154: return 0; /* skip ethernet packet */
155:
156: mtx_lock(&fws_mtx_c);
157:
158: p = malloc(sizeof(struct fws_sndpkt), M_FWSYNC, M_NOWAIT | M_ZERO);
159: if (!p) {
160: mtx_unlock(&fws_mtx_c);
161: return 0;
162: } else
163: spkt = &p->sp_proto;
164:
165: spkt->fws_version = FWS_PKTVER_STATE;
166: spkt->fws_fib = pkt->fib;
167: spkt->fws_cmdtype = edata->cmdtype;
168: spkt->fws_kidx = edata->kidx;
169: spkt->fws_ruleid = edata->ruleid;
170: spkt->fws_rulenum = edata->rulenum;
171: spkt->fws_proto = pkt->proto;
172: spkt->fws_addrtype = pkt->addr_type;
173: spkt->fws_sport = pkt->src_port;
174: spkt->fws_dport = pkt->dst_port;
175:
176: switch (pkt->addr_type) {
177: case 4:
178: spkt->fws_saddr.s_addr = pkt->src_ip;
179: spkt->fws_daddr.s_addr = pkt->dst_ip;
180: spkt->fws_scopeid = 0;
181: break;
182: case 6:
183: memcpy(&spkt->fws_saddr6, &pkt->src_ip6, sizeof spkt->fws_saddr6);
184: memcpy(&spkt->fws_daddr6, &pkt->dst_ip6, sizeof spkt->fws_daddr6);
185: spkt->fws_scopeid = pkt->flow_id6;
186: break;
187: default:
188: free(p, M_FWSYNC);
189: mtx_unlock(&fws_mtx_c);
190: return EINVAL;
191: }
192:
193: TAILQ_INSERT_TAIL(&fwsync_sndpkt, p, sp_next);
194:
195: mtx_unlock(&fws_mtx_c);
196:
197: taskqueue_enqueue(fws_tq, &fws_sndpkt_task);
198: return 0;
199: }
200:
201: int
202: fwsync_alias_handler(const void *arg, const void *extdata)
203: {
204: const struct alias_link *lnk = arg;
205: struct fws_proto *spkt;
206: struct fws_sndpkt *p;
207:
208: DTRACE();
209:
210: if (!lnk || lnk->link_type >= IPPROTO_MAX)
211: return 0;
212:
213: mtx_lock(&fws_mtx_c);
214:
215: p = malloc(sizeof(struct fws_sndpkt), M_FWSYNC, M_NOWAIT | M_ZERO);
216: if (!p) {
217: mtx_unlock(&fws_mtx_c);
218: return 0;
219: } else
220: spkt = &p->sp_proto;
221:
222: spkt->fws_version = FWS_PKTVER_ALIAS;
223: spkt->fws_proto = lnk->link_type;
224: spkt->fws_addrtype = 4;
225: spkt->fws_sport = lnk->src_port;
226: spkt->fws_dport = lnk->dst_port;
227: spkt->fws_aport = lnk->alias_port;
228: spkt->fws_pport = lnk->proxy_port;
229: spkt->fws_saddr.s_addr = lnk->src_addr.s_addr;
230: spkt->fws_daddr.s_addr = lnk->dst_addr.s_addr;
231: spkt->fws_aaddr.s_addr = lnk->alias_addr.s_addr;
232: spkt->fws_paddr.s_addr = lnk->proxy_addr.s_addr;
233:
234: TAILQ_INSERT_TAIL(&fwsync_sndpkt, p, sp_next);
235:
236: mtx_unlock(&fws_mtx_c);
237:
238: taskqueue_enqueue(fws_tq, &fws_sndpkt_task);
239: return 0;
240: }
241:
242: int
243: fwsync_state_sync(const void *arg, const void *extdata)
244: {
245: struct fws_sndpkt *pkt;
246: struct ipfw_flow_id fid;
247: struct ip_fw *rule;
248: int f_pos;
249: struct ip_fw_chain *chain = &V_layer3_chain;
250:
251: DTRACE();
252:
253: mtx_lock(&fws_mtx_u);
254: pkt = TAILQ_FIRST(&fwsync_updpkt);
255: if (pkt)
256: TAILQ_REMOVE(&fwsync_updpkt, pkt, sp_next);
257: mtx_unlock(&fws_mtx_u);
258:
259: if (!pkt) /* update queue is empty */
260: return 0;
261:
262: if (!(fws_cfg.cfg.on & CFG_SYNC_EDGE)) {
263: free(pkt, M_FWSYNC);
264: return EAGAIN;
265: }
266:
267: memset(&fid, 0, sizeof fid);
268: fid.fib = pkt->sp_proto.fws_fib;
269: fid.proto = pkt->sp_proto.fws_proto;
270: fid.addr_type = pkt->sp_proto.fws_addrtype;
271: fid.src_port = pkt->sp_proto.fws_sport;
272: fid.dst_port = pkt->sp_proto.fws_dport;
273: switch (pkt->sp_proto.fws_addrtype) {
274: case 4:
275: fid.src_ip = pkt->sp_proto.fws_saddr.s_addr;
276: fid.dst_ip = pkt->sp_proto.fws_daddr.s_addr;
277: break;
278: case 6:
279: memcpy(&fid.src_ip6, &pkt->sp_proto.fws_saddr6, sizeof fid.src_ip6);
280: memcpy(&fid.dst_ip6, &pkt->sp_proto.fws_daddr6, sizeof fid.dst_ip6);
281: fid.flow_id6 = pkt->sp_proto.fws_scopeid;
282: break;
283: default:
284: free(pkt, M_FWSYNC);
285: return EINVAL;
286: }
287:
288: f_pos = ipfw_find_rule(chain, pkt->sp_proto.fws_ruleid, pkt->sp_proto.fws_rulenum);
289: rule = chain->map[f_pos];
290: ipfw_dyn_install_sync_state(&fid, rule,
291: pkt->sp_proto.fws_ruleid, pkt->sp_proto.fws_rulenum,
292: pkt->sp_proto.fws_kidx, pkt->sp_proto.fws_cmdtype);
293:
294: free(pkt, M_FWSYNC);
295: return 0;
296: }
297:
298: int
299: fwsync_alias_sync(const void *arg, const void *extdata)
300: {
301: struct fws_sndpkt *pkt;
302: const struct cfg_nat *t = arg;
303:
304: DTRACE();
305:
306: mtx_lock(&fws_mtx_n);
307: pkt = TAILQ_FIRST(&fwsync_natpkt);
308: if (pkt)
309: TAILQ_REMOVE(&fwsync_natpkt, pkt, sp_next);
310: mtx_unlock(&fws_mtx_n);
311:
312: if (!pkt) /* update queue is empty */
313: return 0;
314:
315: if (!(fws_cfg.cfg.on & CFG_SYNC_EDGE)) {
316: free(pkt, M_FWSYNC);
317: return EAGAIN;
318: }
319:
320: printf("%s: pkt=%p t=%p\n", __func__, pkt, t->if_name);
321:
322: LIBALIAS_LOCK(t->lib);
323: AddLink(t->lib, pkt->sp_proto.fws_saddr, pkt->sp_proto.fws_daddr, pkt->sp_proto.fws_aaddr,
324: pkt->sp_proto.fws_sport, pkt->sp_proto.fws_dport, pkt->sp_proto.fws_aport,
325: pkt->sp_proto.fws_linktype | LINK_SYNC_MASK);
326: LIBALIAS_UNLOCK(t->lib);
327:
328: free(pkt, M_FWSYNC);
329: return 0;
330: }
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