X-Git-Url: http://git.archive.openwrt.org/?p=project%2Ffirewall3.git;a=blobdiff_plain;f=defaults.c;h=ec95ec918e7e116bfdf0e5338690e5c06795d1bc;hp=498e5d5bbd40c4cae244089472d9a5a39e04747e;hb=e7b6234df3d34d82b909f1e7367a89d322f87814;hpb=8fee8f9c520c58d07772cc6bd8f65d9eb1776a56 diff --git a/defaults.c b/defaults.c index 498e5d5..ec95ec9 100644 --- a/defaults.c +++ b/defaults.c @@ -19,7 +19,33 @@ #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_chain_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, MANGLE, UNSPEC, "fwmark"), + + C(ANY, RAW, UNSPEC, "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 +59,6 @@ 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 +66,26 @@ static struct fw3_option default_opts[] = { FW3_OPT("custom_chains", bool, defaults, custom_chains), FW3_OPT("disable_ipv6", bool, defaults, disable_ipv6), + + FW3_OPT("__flags_v4", int, defaults, flags[0]), + FW3_OPT("__flags_v6", int, defaults, flags[1]), + + { } }; 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 +117,7 @@ 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"); @@ -97,187 +126,315 @@ 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_ipt_handle *handle, struct fw3_state *state, + bool reload) { struct fw3_defaults *defs = &state->defaults; - const char *policy[] = { - "(bug)", - "ACCEPT", - "DROP", - "DROP", - "(bug)", - "(bug)", - "(bug)", - }; + const struct fw3_chain_spec *c; + +#define policy(t) \ + ((t == FW3_FLAG_REJECT) ? FW3_FLAG_DROP : t) - switch (table) + if (handle->family == FW3_FAMILY_V6 && defs->disable_ipv6) + return; + + if (handle->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_ipt_set_policy(handle, "INPUT", policy(defs->policy_input)); + fw3_ipt_set_policy(handle, "OUTPUT", policy(defs->policy_output)); + fw3_ipt_set_policy(handle, "FORWARD", policy(defs->policy_forward)); + } - 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"); - } + if (defs->custom_chains) + set(defs->flags, handle->family, 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->syn_flood) + set(defs->flags, handle->family, FW3_FLAG_SYN_FLOOD); - case FW3_TABLE_NAT: - if (defs->custom_chains) - { - fw3_pr(":prerouting_rule - [0:0]\n"); - fw3_pr(":postrouting_rule - [0:0]\n"); - } - break; + for (c = default_chains; c->format; c++) + { + /* don't touch user chains on selective stop */ + if (reload && c->flag == FW3_FLAG_CUSTOM_CHAINS) + continue; - case FW3_TABLE_MANGLE: - fw3_pr(":mssfix - [0:0]\n"); - break; + if (!fw3_is_family(c, handle->family)) + continue; - case FW3_TABLE_RAW: - if (!defs->drop_invalid) - fw3_pr(":notrack - [0:0]\n"); - break; + if (c->table != handle->table) + continue; + + if (c->flag && + !hasbit(defs->flags[handle->family == FW3_FAMILY_V6], c->flag)) + continue; + + fw3_ipt_create_chain(handle, c->format); } + + set(defs->flags, handle->family, handle->table); } + +struct toplevel_rule { + enum fw3_table table; + const char *chain; + const char *target; +}; + void -fw3_print_default_rules(enum fw3_table table, enum fw3_family family, - struct fw3_state *state) +fw3_print_default_head_rules(struct fw3_ipt_handle *handle, + struct fw3_state *state, bool reload) { int i; struct fw3_defaults *defs = &state->defaults; + struct fw3_device lodev = { .set = true }; + struct fw3_protocol tcp = { .protocol = 6 }; + struct fw3_ipt_rule *r; + struct toplevel_rule *tr; + const char *chains[] = { - "INPUT", - "OUTPUT", - "FORWARD", + "delegate_input", "input", + "delegate_output", "output", + "delegate_forward", "forwarding", }; - switch (table) + struct toplevel_rule rules[] = { + { FW3_TABLE_FILTER, "INPUT", "delegate_input" }, + { FW3_TABLE_FILTER, "OUTPUT", "delegate_output" }, + { FW3_TABLE_FILTER, "FORWARD", "delegate_forward" }, + + { FW3_TABLE_NAT, "PREROUTING", "delegate_prerouting" }, + { FW3_TABLE_NAT, "POSTROUTING", "delegate_postrouting" }, + + { FW3_TABLE_MANGLE, "FORWARD", "mssfix" }, + { FW3_TABLE_MANGLE, "PREROUTING", "fwmark" }, + + { FW3_TABLE_RAW, "PREROUTING", "notrack" }, + + { 0, NULL }, + }; + + for (tr = rules; tr->chain; tr++) + { + if (tr->table != handle->table) + continue; + + r = fw3_ipt_rule_new(handle); + fw3_ipt_rule_target(r, tr->target); + fw3_ipt_rule_append(r, tr->chain); + } + + switch (handle->table) { case FW3_TABLE_FILTER: - fw3_pr("-A INPUT -i lo -j ACCEPT\n"); - fw3_pr("-A OUTPUT -o lo -j ACCEPT\n"); - for (i = 0; i < ARRAY_SIZE(chains); i++) - { - fw3_pr("-A %s -m conntrack --ctstate RELATED,ESTABLISHED " - "-j ACCEPT\n", chains[i]); + sprintf(lodev.name, "lo"); - if (defs->drop_invalid) + r = fw3_ipt_rule_create(handle, NULL, &lodev, NULL, NULL, NULL); + fw3_ipt_rule_target(r, "ACCEPT"); + fw3_ipt_rule_append(r, "delegate_input"); + + r = fw3_ipt_rule_create(handle, NULL, NULL, &lodev, NULL, NULL); + fw3_ipt_rule_target(r, "ACCEPT"); + fw3_ipt_rule_append(r, "delegate_output"); + + if (defs->custom_chains) + { + for (i = 0; i < ARRAY_SIZE(chains); i += 2) { - fw3_pr("-A %s -m conntrack --ctstate INVALID -j DROP\n", - chains[i]); + r = fw3_ipt_rule_new(handle); + fw3_ipt_rule_comment(r, "user chain for %s", chains[i+1]); + fw3_ipt_rule_target(r, "%s_rule", chains[i+1]); + fw3_ipt_rule_append(r, chains[i]); } } - if (defs->syn_flood) + for (i = 0; i < ARRAY_SIZE(chains); i += 2) { - fw3_pr("-A syn_flood -p tcp --syn"); - fw3_format_limit(&defs->syn_flood_rate); - fw3_pr(" -j RETURN\n"); + r = fw3_ipt_rule_new(handle); + fw3_ipt_rule_extra(r, "-m conntrack --ctstate RELATED,ESTABLISHED"); + fw3_ipt_rule_target(r, "ACCEPT"); + fw3_ipt_rule_append(r, chains[i]); - fw3_pr("-A syn_flood -j DROP\n"); - fw3_pr("-A INPUT -p tcp --syn -j syn_flood\n"); + if (defs->drop_invalid) + { + r = fw3_ipt_rule_new(handle); + fw3_ipt_rule_extra(r, "-m conntrack --ctstate INVALID"); + fw3_ipt_rule_target(r, "DROP"); + fw3_ipt_rule_append(r, chains[i]); + } } - if (defs->custom_chains) + if (defs->syn_flood) { - fw3_pr("-A INPUT -j input_rule\n"); - fw3_pr("-A OUTPUT -j output_rule\n"); - fw3_pr("-A FORWARD -j forwarding_rule\n"); + r = fw3_ipt_rule_create(handle, &tcp, NULL, NULL, NULL, NULL); + fw3_ipt_rule_extra(r, "--syn"); + fw3_ipt_rule_limit(r, &defs->syn_flood_rate); + fw3_ipt_rule_target(r, "RETURN"); + fw3_ipt_rule_append(r, "syn_flood"); + + r = fw3_ipt_rule_new(handle); + fw3_ipt_rule_target(r, "DROP"); + fw3_ipt_rule_append(r, "syn_flood"); + + r = fw3_ipt_rule_create(handle, &tcp, NULL, NULL, NULL, NULL); + fw3_ipt_rule_extra(r, "--syn"); + fw3_ipt_rule_target(r, "syn_flood"); + fw3_ipt_rule_append(r, "delegate_input"); } - 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"); + r = fw3_ipt_rule_create(handle, &tcp, NULL, NULL, NULL, NULL); + fw3_ipt_rule_target(r, "REJECT"); + fw3_ipt_rule_addarg(r, false, "--reject-with", "tcp-reset"); + fw3_ipt_rule_append(r, "reject"); - 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"); + r = fw3_ipt_rule_new(handle); + fw3_ipt_rule_target(r, "REJECT"); + fw3_ipt_rule_addarg(r, false, "--reject-with", "port-unreach"); + fw3_ipt_rule_append(r, "reject"); 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"); + r = fw3_ipt_rule_new(handle); + fw3_ipt_rule_comment(r, "user chain for prerouting"); + fw3_ipt_rule_target(r, "prerouting_rule"); + fw3_ipt_rule_append(r, "delegate_prerouting"); + + r = fw3_ipt_rule_new(handle); + fw3_ipt_rule_comment(r, "user chain for postrouting"); + fw3_ipt_rule_target(r, "postrouting_rule"); + fw3_ipt_rule_append(r, "delegate_postrouting"); } 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_ipt_handle *handle, + struct fw3_state *state, bool reload) +{ + struct fw3_defaults *defs = &state->defaults; + struct fw3_ipt_rule *r; + + if (handle->table != FW3_TABLE_FILTER) + return; + + if (defs->policy_input == FW3_FLAG_REJECT) + { + r = fw3_ipt_rule_new(handle); + + if (!r) + return; + + fw3_ipt_rule_target(r, "reject"); + fw3_ipt_rule_append(r, "delegate_input"); + } + + if (defs->policy_output == FW3_FLAG_REJECT) + { + r = fw3_ipt_rule_new(handle); + + if (!r) + return; + + fw3_ipt_rule_target(r, "reject"); + fw3_ipt_rule_append(r, "delegate_output"); + } + + if (defs->policy_forward == FW3_FLAG_REJECT) + { + r = fw3_ipt_rule_new(handle); + + if (!r) + return; + + fw3_ipt_rule_target(r, "reject"); + fw3_ipt_rule_append(r, "delegate_forward"); } } +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); +} + +void +fw3_flush_rules(struct fw3_ipt_handle *handle, struct fw3_state *state, + bool reload) +{ + enum fw3_flag policy = reload ? FW3_FLAG_DROP : FW3_FLAG_ACCEPT; + struct fw3_defaults *defs = &state->defaults; + const struct fw3_chain_spec *c; + + if (!has(defs->flags, handle->family, handle->table)) + return; + + if (handle->table == FW3_TABLE_FILTER) { - 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 */ + fw3_ipt_set_policy(handle, "INPUT", policy); + fw3_ipt_set_policy(handle, "OUTPUT", policy); + fw3_ipt_set_policy(handle, "FORWARD", policy); + } - case FW3_TABLE_NAT: - fw3_pr("-F\n"); - fw3_pr("-X\n"); - break; + for (c = default_chains; c->format; c++) + { + /* don't touch user chains on selective stop */ + if (reload && c->flag == FW3_FLAG_CUSTOM_CHAINS) + continue; - 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; + if (!fw3_is_family(c, handle->family)) + continue; - 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; + if (c->table != handle->table) + continue; + + if (c->flag && !has(defs->flags, handle->family, c->flag)) + continue; + + fw3_ipt_delete_rules(handle, c->format); + fw3_ipt_delete_chain(handle, c->format); } + + del(defs->flags, handle->family, handle->table); +} + +void +fw3_flush_all(struct fw3_ipt_handle *handle) +{ + if (handle->table == FW3_TABLE_FILTER) + { + fw3_ipt_set_policy(handle, "INPUT", FW3_FLAG_ACCEPT); + fw3_ipt_set_policy(handle, "OUTPUT", FW3_FLAG_ACCEPT); + fw3_ipt_set_policy(handle, "FORWARD", FW3_FLAG_ACCEPT); + } + + fw3_ipt_flush(handle); }