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Elsukov" Date: Mon, 5 Aug 2019 07:49:02 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org Subject: svn commit: r350582 - stable/12/sys/netpfil/ipfw X-SVN-Group: stable-12 X-SVN-Commit-Author: ae X-SVN-Commit-Paths: stable/12/sys/netpfil/ipfw X-SVN-Commit-Revision: 350582 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-stable-12@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: SVN commit messages for only the 12-stable src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 05 Aug 2019 07:49:04 -0000 Author: ae Date: Mon Aug 5 07:49:02 2019 New Revision: 350582 URL: https://svnweb.freebsd.org/changeset/base/350582 Log: MFC r350417: Add ipfw_get_action() function to get the pointer to action opcode. ACTION_PTR() returns pointer to the start of rule action section, but rule can keep several rule modifiers like O_LOG, O_TAG and O_ALTQ, and only then real action opcode is stored. ipfw_get_action() function inspects the rule action section, skips all modifiers and returns action opcode. Use this function in ipfw_reset_eaction() and flush_nat_ptrs(). Modified: stable/12/sys/netpfil/ipfw/ip_fw_eaction.c stable/12/sys/netpfil/ipfw/ip_fw_nat.c stable/12/sys/netpfil/ipfw/ip_fw_private.h stable/12/sys/netpfil/ipfw/ip_fw_sockopt.c Directory Properties: stable/12/ (props changed) Modified: stable/12/sys/netpfil/ipfw/ip_fw_eaction.c ============================================================================== --- stable/12/sys/netpfil/ipfw/ip_fw_eaction.c Mon Aug 5 06:01:29 2019 (r350581) +++ stable/12/sys/netpfil/ipfw/ip_fw_eaction.c Mon Aug 5 07:49:02 2019 (r350582) @@ -377,33 +377,30 @@ ipfw_reset_eaction(struct ip_fw_chain *ch, struct ip_f uint16_t eaction_id, uint16_t default_id, uint16_t instance_id) { ipfw_insn *cmd, *icmd; - int l, cmdlen; + int l; IPFW_UH_WLOCK_ASSERT(ch); IPFW_WLOCK_ASSERT(ch); - cmd = ACTION_PTR(rule); - l = rule->cmd_len - rule->act_ofs; - while (l > 0) { - cmdlen = F_LEN(cmd); - l -= cmdlen; - if (cmd->opcode == O_EXTERNAL_ACTION || l <= 0) - break; - cmd += cmdlen; - } /* * Return if there is not O_EXTERNAL_ACTION or its id is * different. */ + cmd = ipfw_get_action(rule); if (cmd->opcode != O_EXTERNAL_ACTION || cmd->arg1 != eaction_id) return (0); /* * If instance_id is specified, we need to truncate the * rule length. Check if there is O_EXTERNAL_INSTANCE opcode. + * + * NOTE: F_LEN(cmd) must be 1 for O_EXTERNAL_ACTION opcode, + * and rule length should be enough to keep O_EXTERNAL_INSTANCE + * opcode, thus we do check for l > 1. */ - if (instance_id != 0 && l > 0) { - MPASS(cmdlen == 1); + l = rule->cmd + rule->cmd_len - cmd; + if (instance_id != 0 && l > 1) { + MPASS(F_LEN(cmd) == 1); icmd = cmd + 1; if (icmd->opcode != O_EXTERNAL_INSTANCE || icmd->arg1 != instance_id) @@ -415,8 +412,9 @@ ipfw_reset_eaction(struct ip_fw_chain *ch, struct ip_f * opcode. */ EACTION_DEBUG("truncate rule %d: len %u -> %u", - rule->rulenum, rule->cmd_len, rule->cmd_len - l); - rule->cmd_len -= l; + rule->rulenum, rule->cmd_len, + rule->cmd_len - F_LEN(icmd)); + rule->cmd_len -= F_LEN(icmd); MPASS(((uint32_t *)icmd - (uint32_t *)rule->cmd) == rule->cmd_len); } Modified: stable/12/sys/netpfil/ipfw/ip_fw_nat.c ============================================================================== --- stable/12/sys/netpfil/ipfw/ip_fw_nat.c Mon Aug 5 06:01:29 2019 (r350581) +++ stable/12/sys/netpfil/ipfw/ip_fw_nat.c Mon Aug 5 07:49:02 2019 (r350582) @@ -141,13 +141,12 @@ ifaddr_change(void *arg __unused, struct ifnet *ifp) static void flush_nat_ptrs(struct ip_fw_chain *chain, const int ix) { - int i; ipfw_insn_nat *cmd; + int i; IPFW_WLOCK_ASSERT(chain); for (i = 0; i < chain->n_rules; i++) { - cmd = (ipfw_insn_nat *)ACTION_PTR(chain->map[i]); - /* XXX skip log and the like ? */ + cmd = (ipfw_insn_nat *)ipfw_get_action(chain->map[i]); if (cmd->o.opcode == O_NAT && cmd->nat != NULL && (ix < 0 || cmd->nat->id == ix)) cmd->nat = NULL; Modified: stable/12/sys/netpfil/ipfw/ip_fw_private.h ============================================================================== --- stable/12/sys/netpfil/ipfw/ip_fw_private.h Mon Aug 5 06:01:29 2019 (r350581) +++ stable/12/sys/netpfil/ipfw/ip_fw_private.h Mon Aug 5 07:49:02 2019 (r350582) @@ -676,6 +676,7 @@ struct ip_fw *ipfw_alloc_rule(struct ip_fw_chain *chai void ipfw_free_rule(struct ip_fw *rule); int ipfw_match_range(struct ip_fw *rule, ipfw_range_tlv *rt); int ipfw_mark_object_kidx(uint32_t *bmask, uint16_t etlv, uint16_t kidx); +ipfw_insn *ipfw_get_action(struct ip_fw *); typedef int (sopt_handler_f)(struct ip_fw_chain *ch, ip_fw3_opheader *op3, struct sockopt_data *sd); Modified: stable/12/sys/netpfil/ipfw/ip_fw_sockopt.c ============================================================================== --- stable/12/sys/netpfil/ipfw/ip_fw_sockopt.c Mon Aug 5 06:01:29 2019 (r350581) +++ stable/12/sys/netpfil/ipfw/ip_fw_sockopt.c Mon Aug 5 07:49:02 2019 (r350582) @@ -1219,6 +1219,35 @@ move_range(struct ip_fw_chain *chain, ipfw_range_tlv * } /* + * Returns pointer to action instruction, skips all possible rule + * modifiers like O_LOG, O_TAG, O_ALTQ. + */ +ipfw_insn * +ipfw_get_action(struct ip_fw *rule) +{ + ipfw_insn *cmd; + int l, cmdlen; + + cmd = ACTION_PTR(rule); + l = rule->cmd_len - rule->act_ofs; + while (l > 0) { + switch (cmd->opcode) { + case O_ALTQ: + case O_LOG: + case O_TAG: + break; + default: + return (cmd); + } + cmdlen = F_LEN(cmd); + l -= cmdlen; + cmd += cmdlen; + } + panic("%s: rule (%p) has not action opcode", __func__, rule); + return (NULL); +} + +/* * Clear counters for a specific rule. * Normally run under IPFW_UH_RLOCK, but these are idempotent ops * so we only care that rules do not disappear.