diff options
8 files changed, 443 insertions, 0 deletions
diff --git a/target/linux/generic/patches-2.6.39/610-netfilter_match_bypass_default_checks.patch b/target/linux/generic/patches-2.6.39/610-netfilter_match_bypass_default_checks.patch new file mode 100644 index 0000000000..ac0fd151cd --- /dev/null +++ b/target/linux/generic/patches-2.6.39/610-netfilter_match_bypass_default_checks.patch @@ -0,0 +1,90 @@ +--- a/include/linux/netfilter_ipv4/ip_tables.h ++++ b/include/linux/netfilter_ipv4/ip_tables.h +@@ -93,6 +93,7 @@ struct ipt_ip { + #define IPT_F_FRAG 0x01 /* Set if rule is a fragment rule */ + #define IPT_F_GOTO 0x02 /* Set if jump is a goto */ + #define IPT_F_MASK 0x03 /* All possible flag bits mask. */ ++#define IPT_F_NO_DEF_MATCH 0x80 /* Internal: no default match rules present */ + + /* Values for "inv" field in struct ipt_ip. */ + #define IPT_INV_VIA_IN 0x01 /* Invert the sense of IN IFACE. */ +--- a/net/ipv4/netfilter/ip_tables.c ++++ b/net/ipv4/netfilter/ip_tables.c +@@ -90,6 +90,9 @@ ip_packet_match(const struct iphdr *ip, + + #define FWINV(bool, invflg) ((bool) ^ !!(ipinfo->invflags & (invflg))) + ++ if (ipinfo->flags & IPT_F_NO_DEF_MATCH) ++ return true; ++ + if (FWINV((ip->saddr&ipinfo->smsk.s_addr) != ipinfo->src.s_addr, + IPT_INV_SRCIP) || + FWINV((ip->daddr&ipinfo->dmsk.s_addr) != ipinfo->dst.s_addr, +@@ -143,6 +146,26 @@ ip_packet_match(const struct iphdr *ip, + return true; + } + ++static void ++ip_checkdefault(struct ipt_ip *ip) ++{ ++ static const char iface_mask[IFNAMSIZ] = {}; ++ ++ if (ip->invflags || ip->flags & IPT_F_FRAG) ++ return; ++ ++ if (memcmp(ip->iniface_mask, iface_mask, IFNAMSIZ) != 0) ++ return; ++ ++ if (memcmp(ip->outiface_mask, iface_mask, IFNAMSIZ) != 0) ++ return; ++ ++ if (ip->proto) ++ return; ++ ++ ip->flags |= IPT_F_NO_DEF_MATCH; ++} ++ + static bool + ip_checkentry(const struct ipt_ip *ip) + { +@@ -566,7 +589,7 @@ static void cleanup_match(struct xt_entr + } + + static int +-check_entry(const struct ipt_entry *e, const char *name) ++check_entry(struct ipt_entry *e, const char *name) + { + const struct xt_entry_target *t; + +@@ -575,6 +598,8 @@ check_entry(const struct ipt_entry *e, c + return -EINVAL; + } + ++ ip_checkdefault(&e->ip); ++ + if (e->target_offset + sizeof(struct xt_entry_target) > + e->next_offset) + return -EINVAL; +@@ -936,6 +961,7 @@ copy_entries_to_user(unsigned int total_ + const struct xt_table_info *private = table->private; + int ret = 0; + const void *loc_cpu_entry; ++ u8 flags; + + counters = alloc_counters(table); + if (IS_ERR(counters)) +@@ -967,6 +993,14 @@ copy_entries_to_user(unsigned int total_ + goto free_counters; + } + ++ flags = e->ip.flags & IPT_F_MASK; ++ if (copy_to_user(userptr + off ++ + offsetof(struct ipt_entry, ip.flags), ++ &flags, sizeof(flags)) != 0) { ++ ret = -EFAULT; ++ goto free_counters; ++ } ++ + for (i = sizeof(struct ipt_entry); + i < e->target_offset; + i += m->u.match_size) { diff --git a/target/linux/generic/patches-2.6.39/611-netfilter_match_bypass_default_table.patch b/target/linux/generic/patches-2.6.39/611-netfilter_match_bypass_default_table.patch new file mode 100644 index 0000000000..f2004a6b12 --- /dev/null +++ b/target/linux/generic/patches-2.6.39/611-netfilter_match_bypass_default_table.patch @@ -0,0 +1,78 @@ +--- a/net/ipv4/netfilter/ip_tables.c ++++ b/net/ipv4/netfilter/ip_tables.c +@@ -316,6 +316,33 @@ struct ipt_entry *ipt_next_entry(const s + return (void *)entry + entry->next_offset; + } + ++static bool ++ipt_handle_default_rule(struct ipt_entry *e, unsigned int *verdict) ++{ ++ struct xt_entry_target *t; ++ struct xt_standard_target *st; ++ ++ if (e->target_offset != sizeof(struct ipt_entry)) ++ return false; ++ ++ if (!(e->ip.flags & IPT_F_NO_DEF_MATCH)) ++ return false; ++ ++ t = ipt_get_target(e); ++ if (t->u.kernel.target->target) ++ return false; ++ ++ st = (struct xt_standard_target *) t; ++ if (st->verdict == XT_RETURN) ++ return false; ++ ++ if (st->verdict >= 0) ++ return false; ++ ++ *verdict = (unsigned)(-st->verdict) - 1; ++ return true; ++} ++ + /* Returns one of the generic firewall policies, like NF_ACCEPT. */ + unsigned int + ipt_do_table(struct sk_buff *skb, +@@ -339,6 +366,23 @@ ipt_do_table(struct sk_buff *skb, + ip = ip_hdr(skb); + indev = in ? in->name : nulldevname; + outdev = out ? out->name : nulldevname; ++ ++ IP_NF_ASSERT(table->valid_hooks & (1 << hook)); ++ xt_info_rdlock_bh(); ++ private = table->private; ++ cpu = smp_processor_id(); ++ table_base = private->entries[cpu]; ++ jumpstack = (struct ipt_entry **)private->jumpstack[cpu]; ++ stackptr = per_cpu_ptr(private->stackptr, cpu); ++ origptr = *stackptr; ++ ++ e = get_entry(table_base, private->hook_entry[hook]); ++ if (ipt_handle_default_rule(e, &verdict)) { ++ ADD_COUNTER(e->counters, skb->len, 1); ++ xt_info_rdunlock_bh(); ++ return verdict; ++ } ++ + /* We handle fragments by dealing with the first fragment as + * if it was a normal packet. All other fragments are treated + * normally, except that they will NEVER match rules that ask +@@ -353,17 +397,6 @@ ipt_do_table(struct sk_buff *skb, + acpar.family = NFPROTO_IPV4; + acpar.hooknum = hook; + +- IP_NF_ASSERT(table->valid_hooks & (1 << hook)); +- xt_info_rdlock_bh(); +- private = table->private; +- cpu = smp_processor_id(); +- table_base = private->entries[cpu]; +- jumpstack = (struct ipt_entry **)private->jumpstack[cpu]; +- stackptr = per_cpu_ptr(private->stackptr, cpu); +- origptr = *stackptr; +- +- e = get_entry(table_base, private->hook_entry[hook]); +- + pr_debug("Entering %s(hook %u); sp at %u (UF %p)\n", + table->name, hook, origptr, + get_entry(table_base, private->underflow[hook])); diff --git a/target/linux/generic/patches-2.6.39/612-netfilter_match_reduce_memory_access.patch b/target/linux/generic/patches-2.6.39/612-netfilter_match_reduce_memory_access.patch new file mode 100644 index 0000000000..a36a1728d1 --- /dev/null +++ b/target/linux/generic/patches-2.6.39/612-netfilter_match_reduce_memory_access.patch @@ -0,0 +1,16 @@ +--- a/net/ipv4/netfilter/ip_tables.c ++++ b/net/ipv4/netfilter/ip_tables.c +@@ -93,9 +93,11 @@ ip_packet_match(const struct iphdr *ip, + if (ipinfo->flags & IPT_F_NO_DEF_MATCH) + return true; + +- if (FWINV((ip->saddr&ipinfo->smsk.s_addr) != ipinfo->src.s_addr, ++ if (FWINV(ipinfo->smsk.s_addr && ++ (ip->saddr&ipinfo->smsk.s_addr) != ipinfo->src.s_addr, + IPT_INV_SRCIP) || +- FWINV((ip->daddr&ipinfo->dmsk.s_addr) != ipinfo->dst.s_addr, ++ FWINV(ipinfo->smsk.s_addr && ++ (ip->daddr&ipinfo->dmsk.s_addr) != ipinfo->dst.s_addr, + IPT_INV_DSTIP)) { + dprintf("Source or dest mismatch.\n"); + diff --git a/target/linux/generic/patches-2.6.39/613-netfilter_optional_tcp_window_check.patch b/target/linux/generic/patches-2.6.39/613-netfilter_optional_tcp_window_check.patch new file mode 100644 index 0000000000..1c259d4f0c --- /dev/null +++ b/target/linux/generic/patches-2.6.39/613-netfilter_optional_tcp_window_check.patch @@ -0,0 +1,36 @@ +--- a/net/netfilter/nf_conntrack_proto_tcp.c ++++ b/net/netfilter/nf_conntrack_proto_tcp.c +@@ -29,6 +29,9 @@ + #include <net/netfilter/ipv4/nf_conntrack_ipv4.h> + #include <net/netfilter/ipv6/nf_conntrack_ipv6.h> + ++/* Do not check the TCP window for incoming packets */ ++static int nf_ct_tcp_no_window_check __read_mostly = 1; ++ + /* "Be conservative in what you do, + be liberal in what you accept from others." + If it's non-zero, we mark only out of window RST segments as INVALID. */ +@@ -524,6 +527,9 @@ static bool tcp_in_window(const struct n + s16 receiver_offset; + bool res; + ++ if (nf_ct_tcp_no_window_check) ++ return true; ++ + /* + * Get the required data from the packet. + */ +@@ -1321,6 +1327,13 @@ static struct ctl_table tcp_sysctl_table + .proc_handler = proc_dointvec, + }, + { ++ .procname = "nf_conntrack_tcp_no_window_check", ++ .data = &nf_ct_tcp_no_window_check, ++ .maxlen = sizeof(unsigned int), ++ .mode = 0644, ++ .proc_handler = proc_dointvec, ++ }, ++ { + .procname = "nf_conntrack_tcp_be_liberal", + .data = &nf_ct_tcp_be_liberal, + .maxlen = sizeof(unsigned int), diff --git a/target/linux/generic/patches-3.0/610-netfilter_match_bypass_default_checks.patch b/target/linux/generic/patches-3.0/610-netfilter_match_bypass_default_checks.patch new file mode 100644 index 0000000000..b8ba5f7dc6 --- /dev/null +++ b/target/linux/generic/patches-3.0/610-netfilter_match_bypass_default_checks.patch @@ -0,0 +1,90 @@ +--- a/include/linux/netfilter_ipv4/ip_tables.h ++++ b/include/linux/netfilter_ipv4/ip_tables.h +@@ -93,6 +93,7 @@ struct ipt_ip { + #define IPT_F_FRAG 0x01 /* Set if rule is a fragment rule */ + #define IPT_F_GOTO 0x02 /* Set if jump is a goto */ + #define IPT_F_MASK 0x03 /* All possible flag bits mask. */ ++#define IPT_F_NO_DEF_MATCH 0x80 /* Internal: no default match rules present */ + + /* Values for "inv" field in struct ipt_ip. */ + #define IPT_INV_VIA_IN 0x01 /* Invert the sense of IN IFACE. */ +--- a/net/ipv4/netfilter/ip_tables.c ++++ b/net/ipv4/netfilter/ip_tables.c +@@ -81,6 +81,9 @@ ip_packet_match(const struct iphdr *ip, + + #define FWINV(bool, invflg) ((bool) ^ !!(ipinfo->invflags & (invflg))) + ++ if (ipinfo->flags & IPT_F_NO_DEF_MATCH) ++ return true; ++ + if (FWINV((ip->saddr&ipinfo->smsk.s_addr) != ipinfo->src.s_addr, + IPT_INV_SRCIP) || + FWINV((ip->daddr&ipinfo->dmsk.s_addr) != ipinfo->dst.s_addr, +@@ -134,6 +137,26 @@ ip_packet_match(const struct iphdr *ip, + return true; + } + ++static void ++ip_checkdefault(struct ipt_ip *ip) ++{ ++ static const char iface_mask[IFNAMSIZ] = {}; ++ ++ if (ip->invflags || ip->flags & IPT_F_FRAG) ++ return; ++ ++ if (memcmp(ip->iniface_mask, iface_mask, IFNAMSIZ) != 0) ++ return; ++ ++ if (memcmp(ip->outiface_mask, iface_mask, IFNAMSIZ) != 0) ++ return; ++ ++ if (ip->proto) ++ return; ++ ++ ip->flags |= IPT_F_NO_DEF_MATCH; ++} ++ + static bool + ip_checkentry(const struct ipt_ip *ip) + { +@@ -561,7 +584,7 @@ static void cleanup_match(struct xt_entr + } + + static int +-check_entry(const struct ipt_entry *e, const char *name) ++check_entry(struct ipt_entry *e, const char *name) + { + const struct xt_entry_target *t; + +@@ -570,6 +593,8 @@ check_entry(const struct ipt_entry *e, c + return -EINVAL; + } + ++ ip_checkdefault(&e->ip); ++ + if (e->target_offset + sizeof(struct xt_entry_target) > + e->next_offset) + return -EINVAL; +@@ -931,6 +956,7 @@ copy_entries_to_user(unsigned int total_ + const struct xt_table_info *private = table->private; + int ret = 0; + const void *loc_cpu_entry; ++ u8 flags; + + counters = alloc_counters(table); + if (IS_ERR(counters)) +@@ -962,6 +988,14 @@ copy_entries_to_user(unsigned int total_ + goto free_counters; + } + ++ flags = e->ip.flags & IPT_F_MASK; ++ if (copy_to_user(userptr + off ++ + offsetof(struct ipt_entry, ip.flags), ++ &flags, sizeof(flags)) != 0) { ++ ret = -EFAULT; ++ goto free_counters; ++ } ++ + for (i = sizeof(struct ipt_entry); + i < e->target_offset; + i += m->u.match_size) { diff --git a/target/linux/generic/patches-3.0/611-netfilter_match_bypass_default_table.patch b/target/linux/generic/patches-3.0/611-netfilter_match_bypass_default_table.patch new file mode 100644 index 0000000000..113f140123 --- /dev/null +++ b/target/linux/generic/patches-3.0/611-netfilter_match_bypass_default_table.patch @@ -0,0 +1,81 @@ +--- a/net/ipv4/netfilter/ip_tables.c ++++ b/net/ipv4/netfilter/ip_tables.c +@@ -307,6 +307,33 @@ struct ipt_entry *ipt_next_entry(const s + return (void *)entry + entry->next_offset; + } + ++static bool ++ipt_handle_default_rule(struct ipt_entry *e, unsigned int *verdict) ++{ ++ struct xt_entry_target *t; ++ struct xt_standard_target *st; ++ ++ if (e->target_offset != sizeof(struct ipt_entry)) ++ return false; ++ ++ if (!(e->ip.flags & IPT_F_NO_DEF_MATCH)) ++ return false; ++ ++ t = ipt_get_target(e); ++ if (t->u.kernel.target->target) ++ return false; ++ ++ st = (struct xt_standard_target *) t; ++ if (st->verdict == XT_RETURN) ++ return false; ++ ++ if (st->verdict >= 0) ++ return false; ++ ++ *verdict = (unsigned)(-st->verdict) - 1; ++ return true; ++} ++ + /* Returns one of the generic firewall policies, like NF_ACCEPT. */ + unsigned int + ipt_do_table(struct sk_buff *skb, +@@ -331,6 +358,25 @@ ipt_do_table(struct sk_buff *skb, + ip = ip_hdr(skb); + indev = in ? in->name : nulldevname; + outdev = out ? out->name : nulldevname; ++ ++ IP_NF_ASSERT(table->valid_hooks & (1 << hook)); ++ local_bh_disable(); ++ addend = xt_write_recseq_begin(); ++ private = table->private; ++ cpu = smp_processor_id(); ++ table_base = private->entries[cpu]; ++ jumpstack = (struct ipt_entry **)private->jumpstack[cpu]; ++ stackptr = per_cpu_ptr(private->stackptr, cpu); ++ origptr = *stackptr; ++ ++ e = get_entry(table_base, private->hook_entry[hook]); ++ if (ipt_handle_default_rule(e, &verdict)) { ++ ADD_COUNTER(e->counters, skb->len, 1); ++ xt_write_recseq_end(addend); ++ local_bh_enable(); ++ return verdict; ++ } ++ + /* We handle fragments by dealing with the first fragment as + * if it was a normal packet. All other fragments are treated + * normally, except that they will NEVER match rules that ask +@@ -345,18 +391,6 @@ ipt_do_table(struct sk_buff *skb, + acpar.family = NFPROTO_IPV4; + acpar.hooknum = hook; + +- IP_NF_ASSERT(table->valid_hooks & (1 << hook)); +- local_bh_disable(); +- addend = xt_write_recseq_begin(); +- private = table->private; +- cpu = smp_processor_id(); +- table_base = private->entries[cpu]; +- jumpstack = (struct ipt_entry **)private->jumpstack[cpu]; +- stackptr = per_cpu_ptr(private->stackptr, cpu); +- origptr = *stackptr; +- +- e = get_entry(table_base, private->hook_entry[hook]); +- + pr_debug("Entering %s(hook %u); sp at %u (UF %p)\n", + table->name, hook, origptr, + get_entry(table_base, private->underflow[hook])); diff --git a/target/linux/generic/patches-3.0/612-netfilter_match_reduce_memory_access.patch b/target/linux/generic/patches-3.0/612-netfilter_match_reduce_memory_access.patch new file mode 100644 index 0000000000..817b37efd1 --- /dev/null +++ b/target/linux/generic/patches-3.0/612-netfilter_match_reduce_memory_access.patch @@ -0,0 +1,16 @@ +--- a/net/ipv4/netfilter/ip_tables.c ++++ b/net/ipv4/netfilter/ip_tables.c +@@ -84,9 +84,11 @@ ip_packet_match(const struct iphdr *ip, + if (ipinfo->flags & IPT_F_NO_DEF_MATCH) + return true; + +- if (FWINV((ip->saddr&ipinfo->smsk.s_addr) != ipinfo->src.s_addr, ++ if (FWINV(ipinfo->smsk.s_addr && ++ (ip->saddr&ipinfo->smsk.s_addr) != ipinfo->src.s_addr, + IPT_INV_SRCIP) || +- FWINV((ip->daddr&ipinfo->dmsk.s_addr) != ipinfo->dst.s_addr, ++ FWINV(ipinfo->smsk.s_addr && ++ (ip->daddr&ipinfo->dmsk.s_addr) != ipinfo->dst.s_addr, + IPT_INV_DSTIP)) { + dprintf("Source or dest mismatch.\n"); + diff --git a/target/linux/generic/patches-3.0/613-netfilter_optional_tcp_window_check.patch b/target/linux/generic/patches-3.0/613-netfilter_optional_tcp_window_check.patch new file mode 100644 index 0000000000..1c259d4f0c --- /dev/null +++ b/target/linux/generic/patches-3.0/613-netfilter_optional_tcp_window_check.patch @@ -0,0 +1,36 @@ +--- a/net/netfilter/nf_conntrack_proto_tcp.c ++++ b/net/netfilter/nf_conntrack_proto_tcp.c +@@ -29,6 +29,9 @@ + #include <net/netfilter/ipv4/nf_conntrack_ipv4.h> + #include <net/netfilter/ipv6/nf_conntrack_ipv6.h> + ++/* Do not check the TCP window for incoming packets */ ++static int nf_ct_tcp_no_window_check __read_mostly = 1; ++ + /* "Be conservative in what you do, + be liberal in what you accept from others." + If it's non-zero, we mark only out of window RST segments as INVALID. */ +@@ -524,6 +527,9 @@ static bool tcp_in_window(const struct n + s16 receiver_offset; + bool res; + ++ if (nf_ct_tcp_no_window_check) ++ return true; ++ + /* + * Get the required data from the packet. + */ +@@ -1321,6 +1327,13 @@ static struct ctl_table tcp_sysctl_table + .proc_handler = proc_dointvec, + }, + { ++ .procname = "nf_conntrack_tcp_no_window_check", ++ .data = &nf_ct_tcp_no_window_check, ++ .maxlen = sizeof(unsigned int), ++ .mode = 0644, ++ .proc_handler = proc_dointvec, ++ }, ++ { + .procname = "nf_conntrack_tcp_be_liberal", + .data = &nf_ct_tcp_be_liberal, + .maxlen = sizeof(unsigned int), |