X-Git-Url: http://git.archive.openwrt.org/?p=project%2Ffirewall3.git;a=blobdiff_plain;f=defaults.c;h=10b11637c81482e0018d1ae68609161ea2425413;hp=498e5d5bbd40c4cae244089472d9a5a39e04747e;hb=eb2a20924afd979feb485298111ced679de42aa0;hpb=8fee8f9c520c58d07772cc6bd8f65d9eb1776a56 diff --git a/defaults.c b/defaults.c index 498e5d5..10b1163 100644 --- a/defaults.c +++ b/defaults.c @@ -19,7 +19,45 @@ #include "defaults.h" -static struct fw3_option default_opts[] = { +#define C(f, tbl, def, fmt) \ + { FW3_FAMILY_##f, FW3_TABLE_##tbl, FW3_FLAG_##def, fmt } + +static const struct fw3_rule_spec default_chains[] = { + C(ANY, FILTER, UNSPEC, "delegate_input"), + C(ANY, FILTER, UNSPEC, "delegate_output"), + C(ANY, FILTER, UNSPEC, "delegate_forward"), + C(ANY, FILTER, UNSPEC, "reject"), + C(ANY, FILTER, CUSTOM_CHAINS, "input_rule"), + C(ANY, FILTER, CUSTOM_CHAINS, "output_rule"), + C(ANY, FILTER, CUSTOM_CHAINS, "forwarding_rule"), + C(ANY, FILTER, SYN_FLOOD, "syn_flood"), + + C(V4, NAT, UNSPEC, "delegate_prerouting"), + C(V4, NAT, UNSPEC, "delegate_postrouting"), + C(V4, NAT, CUSTOM_CHAINS, "prerouting_rule"), + C(V4, NAT, CUSTOM_CHAINS, "postrouting_rule"), + + C(ANY, MANGLE, UNSPEC, "mssfix"), + C(ANY, RAW, UNSPEC, "notrack"), + + { } +}; + +static const struct fw3_rule_spec toplevel_rules[] = { + C(ANY, FILTER, UNSPEC, "INPUT -j delegate_input"), + C(ANY, FILTER, UNSPEC, "OUTPUT -j delegate_output"), + C(ANY, FILTER, UNSPEC, "FORWARD -j delegate_forward"), + + C(V4, NAT, UNSPEC, "PREROUTING -j delegate_prerouting"), + C(V4, NAT, UNSPEC, "POSTROUTING -j delegate_postrouting"), + + C(ANY, MANGLE, UNSPEC, "FORWARD -j mssfix"), + C(ANY, RAW, UNSPEC, "PREROUTING -j notrack"), + + { } +}; + +const struct fw3_option fw3_flag_opts[] = { FW3_OPT("input", target, defaults, policy_input), FW3_OPT("forward", target, defaults, policy_forward), FW3_OPT("output", target, defaults, policy_output), @@ -33,7 +71,6 @@ static struct fw3_option default_opts[] = { FW3_OPT("tcp_syncookies", bool, defaults, tcp_syncookies), FW3_OPT("tcp_ecn", bool, defaults, tcp_ecn), - FW3_OPT("tcp_westwood", bool, defaults, tcp_westwood), FW3_OPT("tcp_window_scaling", bool, defaults, tcp_window_scaling), FW3_OPT("accept_redirects", bool, defaults, accept_redirects), @@ -41,21 +78,23 @@ static struct fw3_option default_opts[] = { FW3_OPT("custom_chains", bool, defaults, custom_chains), FW3_OPT("disable_ipv6", bool, defaults, disable_ipv6), + + { } }; static void -check_policy(struct uci_element *e, enum fw3_target *pol, const char *name) +check_policy(struct uci_element *e, enum fw3_flag *pol, const char *name) { - if (*pol == FW3_TARGET_UNSPEC) + if (*pol == FW3_FLAG_UNSPEC) { warn_elem(e, "has no %s policy specified, defaulting to DROP", name); - *pol = FW3_TARGET_DROP; + *pol = FW3_FLAG_DROP; } - else if (*pol > FW3_TARGET_DROP) + else if (*pol > FW3_FLAG_DROP) { warn_elem(e, "has invalid %s policy, defaulting to DROP", name); - *pol = FW3_TARGET_DROP; + *pol = FW3_FLAG_DROP; } } @@ -87,8 +126,7 @@ fw3_load_defaults(struct fw3_state *state, struct uci_package *p) continue; } - fw3_parse_options(&state->defaults, - default_opts, ARRAY_SIZE(default_opts), s); + fw3_parse_options(&state->defaults, fw3_flag_opts, s); check_policy(e, &defs->policy_input, "input"); check_policy(e, &defs->policy_output, "output"); @@ -97,86 +135,81 @@ fw3_load_defaults(struct fw3_state *state, struct uci_package *p) } void -fw3_print_default_chains(enum fw3_table table, enum fw3_family family, - struct fw3_state *state) +fw3_print_default_chains(struct fw3_state *state, enum fw3_family family, + enum fw3_table table, bool reload) { + bool rv; struct fw3_defaults *defs = &state->defaults; - const char *policy[] = { - "(bug)", - "ACCEPT", - "DROP", - "DROP", - "(bug)", - "(bug)", - "(bug)", - }; + uint32_t custom_mask = ~0; - switch (table) +#define policy(t) \ + ((t == FW3_FLAG_REJECT) ? "DROP" : fw3_flag_names[t]) + + if (family == FW3_FAMILY_V6 && defs->disable_ipv6) + return; + + if (table == FW3_TABLE_FILTER) { - case FW3_TABLE_FILTER: - fw3_pr(":INPUT %s [0:0]\n", policy[defs->policy_input]); - fw3_pr(":FORWARD %s [0:0]\n", policy[defs->policy_forward]); - fw3_pr(":OUTPUT %s [0:0]\n", policy[defs->policy_output]); + fw3_pr(":INPUT %s [0:0]\n", policy(defs->policy_input)); + fw3_pr(":FORWARD %s [0:0]\n", policy(defs->policy_forward)); + fw3_pr(":OUTPUT %s [0:0]\n", policy(defs->policy_output)); + } - if (defs->custom_chains) - { - fw3_pr(":input_rule - [0:0]\n"); - fw3_pr(":output_rule - [0:0]\n"); - fw3_pr(":forwarding_rule - [0:0]\n"); - } + /* Don't touch user chains on reload */ + if (reload) + delbit(custom_mask, FW3_FLAG_CUSTOM_CHAINS); - fw3_pr(":delegate_input - [0:0]\n"); - fw3_pr(":delegate_output - [0:0]\n"); - fw3_pr(":delegate_forward - [0:0]\n"); - fw3_pr(":reject - [0:0]\n"); - fw3_pr(":syn_flood - [0:0]\n"); - break; + if (defs->custom_chains) + set(defs->flags, family, FW3_FLAG_CUSTOM_CHAINS); - case FW3_TABLE_NAT: - if (defs->custom_chains) - { - fw3_pr(":prerouting_rule - [0:0]\n"); - fw3_pr(":postrouting_rule - [0:0]\n"); - } - break; + if (defs->syn_flood) + set(defs->flags, family, FW3_FLAG_SYN_FLOOD); - case FW3_TABLE_MANGLE: - fw3_pr(":mssfix - [0:0]\n"); - break; + rv = fw3_pr_rulespec(table, family, defs->flags, custom_mask, + default_chains, ":%s - [0:0]\n"); - case FW3_TABLE_RAW: - if (!defs->drop_invalid) - fw3_pr(":notrack - [0:0]\n"); - break; - } + if (rv) + set(defs->flags, family, table); } void -fw3_print_default_rules(enum fw3_table table, enum fw3_family family, - struct fw3_state *state) +fw3_print_default_head_rules(struct fw3_state *state, enum fw3_family family, + enum fw3_table table, bool reload) { int i; struct fw3_defaults *defs = &state->defaults; const char *chains[] = { - "INPUT", - "OUTPUT", - "FORWARD", + "input", "input", + "output", "output", + "forward", "forwarding", }; + fw3_pr_rulespec(table, family, NULL, 0, toplevel_rules, "-A %s\n"); + switch (table) { case FW3_TABLE_FILTER: - fw3_pr("-A INPUT -i lo -j ACCEPT\n"); - fw3_pr("-A OUTPUT -o lo -j ACCEPT\n"); + fw3_pr("-A delegate_input -i lo -j ACCEPT\n"); + fw3_pr("-A delegate_output -o lo -j ACCEPT\n"); + + if (defs->custom_chains) + { + for (i = 0; i < ARRAY_SIZE(chains); i += 2) + { + fw3_pr("-A delegate_%s -m comment " + "--comment \"user chain for %s\" -j %s_rule\n", + chains[i], chains[i+1], chains[i+1]); + } + } - for (i = 0; i < ARRAY_SIZE(chains); i++) + for (i = 0; i < ARRAY_SIZE(chains); i += 2) { - fw3_pr("-A %s -m conntrack --ctstate RELATED,ESTABLISHED " + fw3_pr("-A delegate_%s -m conntrack --ctstate RELATED,ESTABLISHED " "-j ACCEPT\n", chains[i]); if (defs->drop_invalid) { - fw3_pr("-A %s -m conntrack --ctstate INVALID -j DROP\n", + fw3_pr("-A delegate_%s -m conntrack --ctstate INVALID -j DROP\n", chains[i]); } } @@ -188,96 +221,128 @@ fw3_print_default_rules(enum fw3_table table, enum fw3_family family, fw3_pr(" -j RETURN\n"); fw3_pr("-A syn_flood -j DROP\n"); - fw3_pr("-A INPUT -p tcp --syn -j syn_flood\n"); - } - - if (defs->custom_chains) - { - fw3_pr("-A INPUT -j input_rule\n"); - fw3_pr("-A OUTPUT -j output_rule\n"); - fw3_pr("-A FORWARD -j forwarding_rule\n"); + fw3_pr("-A delegate_input -p tcp --syn -j syn_flood\n"); } - fw3_pr("-A INPUT -j delegate_input\n"); - fw3_pr("-A OUTPUT -j delegate_output\n"); - fw3_pr("-A FORWARD -j delegate_forward\n"); - fw3_pr("-A reject -p tcp -j REJECT --reject-with tcp-reset\n"); fw3_pr("-A reject -j REJECT --reject-with port-unreach\n"); - if (defs->policy_input == FW3_TARGET_REJECT) - fw3_pr("-A INPUT -j reject\n"); - - if (defs->policy_output == FW3_TARGET_REJECT) - fw3_pr("-A OUTPUT -j reject\n"); - - if (defs->policy_forward == FW3_TARGET_REJECT) - fw3_pr("-A FORWARD -j reject\n"); - break; case FW3_TABLE_NAT: if (defs->custom_chains) { - fw3_pr("-A PREROUTING -j prerouting_rule\n"); - fw3_pr("-A POSTROUTING -j postrouting_rule\n"); + fw3_pr("-A delegate_prerouting " + "-m comment --comment \"user chain for prerouting\" " + "-j prerouting_rule\n"); + + fw3_pr("-A delegate_postrouting " + "-m comment --comment \"user chain for postrouting\" " + "-j postrouting_rule\n"); } break; - case FW3_TABLE_MANGLE: - fw3_pr("-A FORWARD -j mssfix\n"); + default: break; + } +} - case FW3_TABLE_RAW: - if (!defs->drop_invalid) - fw3_pr("-A PREROUTING -j notrack\n"); - break; +void +fw3_print_default_tail_rules(struct fw3_state *state, enum fw3_family family, + enum fw3_table table, bool reload) +{ + struct fw3_defaults *defs = &state->defaults; + + if (table != FW3_TABLE_FILTER) + return; + + if (defs->policy_input == FW3_FLAG_REJECT) + fw3_pr("-A delegate_input -j reject\n"); + + if (defs->policy_output == FW3_FLAG_REJECT) + fw3_pr("-A delegate_output -j reject\n"); + + if (defs->policy_forward == FW3_FLAG_REJECT) + fw3_pr("-A delegate_forward -j reject\n"); +} + +static void +set_default(const char *name, bool set) +{ + FILE *f; + char path[sizeof("/proc/sys/net/ipv4/tcp_window_scaling\0")]; + + snprintf(path, sizeof(path), "/proc/sys/net/ipv4/tcp_%s", name); + + info(" * Set tcp_%s to %s", name, set ? "on" : "off", name); + + if (!(f = fopen(path, "w"))) + { + info(" ! Unable to write value: %s", strerror(errno)); + return; } + + fprintf(f, "%u\n", set); + fclose(f); } void -fw3_print_flush_rules(enum fw3_table table, enum fw3_family family, - struct fw3_state *state, bool complete) +fw3_set_defaults(struct fw3_state *state) { - switch (table) + set_default("ecn", state->defaults.tcp_ecn); + set_default("syncookies", state->defaults.tcp_syncookies); + set_default("window_scaling", state->defaults.tcp_window_scaling); +} + +static void +reset_policy(enum fw3_table table, enum fw3_flag policy) +{ + if (table != FW3_TABLE_FILTER) + return; + + fw3_pr(":INPUT %s [0:0]\n", fw3_flag_names[policy]); + fw3_pr(":OUTPUT %s [0:0]\n", fw3_flag_names[policy]); + fw3_pr(":FORWARD %s [0:0]\n", fw3_flag_names[policy]); +} + +void +fw3_flush_rules(struct fw3_state *state, enum fw3_family family, + enum fw3_table table, bool reload, bool pass2) +{ + struct fw3_defaults *defs = &state->defaults; + uint32_t custom_mask = ~0; + + if (!has(defs->flags, family, table)) + return; + + /* don't touch user chains on selective stop */ + if (reload) + delbit(custom_mask, FW3_FLAG_CUSTOM_CHAINS); + + if (!pass2) { - case FW3_TABLE_FILTER: - fw3_pr(":INPUT ACCEPT [0:0]\n"); - fw3_pr(":OUTPUT ACCEPT [0:0]\n"); - fw3_pr(":FORWARD ACCEPT [0:0]\n"); - /* fall through */ + reset_policy(table, reload ? FW3_FLAG_DROP : FW3_FLAG_ACCEPT); - case FW3_TABLE_NAT: - fw3_pr("-F\n"); - fw3_pr("-X\n"); - break; + fw3_pr_rulespec(table, family, defs->flags, custom_mask, + toplevel_rules, "-D %s\n"); - case FW3_TABLE_MANGLE: - if (complete) - { - fw3_pr("-F\n"); - fw3_pr("-X\n"); - } - else - { - fw3_pr("-D FORWARD -j mssfix\n"); - fw3_pr("-F mssfix\n"); - fw3_pr("-X mssfix\n"); - } - break; + fw3_pr_rulespec(table, family, defs->flags, custom_mask, + default_chains, "-F %s\n"); + } + else + { + fw3_pr_rulespec(table, family, defs->flags, custom_mask, + default_chains, "-X %s\n"); - case FW3_TABLE_RAW: - if (complete) - { - fw3_pr("-F\n"); - fw3_pr("-X\n"); - } - else - { - fw3_pr("-D PREROUTING -j notrack\n"); - fw3_pr("-F notrack\n"); - fw3_pr("-X notrack\n"); - } - break; + del(defs->flags, family, table); } } + +void +fw3_flush_all(enum fw3_table table) +{ + reset_policy(table, FW3_FLAG_ACCEPT); + + fw3_pr("-F\n"); + fw3_pr("-X\n"); +}