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2018-08-07curve25519-hacl64: correct u64_gte_maskSamuel Neves
Remove signed right shifts. Previously u64_gte_mask was only correct for x < 2^63. Z3 script proving correctness: >>> from z3 import * >>> >>> x = BitVec("x", 64) >>> y = BitVec("y", 64) >>> >>> t = LShR(x^((x^y)|((x-y)^y)), 63) - 1 >>> >>> prove(If(UGE(x, y), BitVecVal(-1, 64), BitVecVal(0, 64)) == t) proved Signed-off-by: Samuel Neves <sneves@dei.uc.pt> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-08-07curve25519-hacl64: simplify u64_eq_maskSamuel Neves
Avoid signed right shift. Z3 script showing equivalence: >>> from z3 import * >>> >>> x = BitVec("x", 64) >>> y = BitVec("y", 64) >>> >>> # Before ... x_ = ~(x ^ y) >>> x_ &= x_ << 32 >>> x_ &= x_ << 16 >>> x_ &= x_ << 8 >>> x_ &= x_ << 4 >>> x_ &= x_ << 2 >>> x_ &= x_ << 1 >>> x_ >>= 63 >>> >>> # After ... y_ = x ^ y >>> y_ = y_ | -y_ >>> y_ = LShR(y_, 63) - 1 >>> >>> prove(x_ == y_) proved Signed-off-by: Samuel Neves <sneves@dei.uc.pt> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-08-07chacha20: use memmove in case buffers overlapJason A. Donenfeld
Suggested-by: Samuel Neves <sneves@dei.uc.pt> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-08-07curve25519-x86_64: avoid use of r12Jason A. Donenfeld
This causes problems with RAP and KERNEXEC for PaX, as r12 is a reserved register. Suggested-by: PaX Team <pageexec@freemail.hu> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-08-06qemu: add easy git harnessJason A. Donenfeld
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-08-06chacha20poly1305: selftest: use arrays for test vectorsJason A. Donenfeld
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-08-06crypto: move simd context to specific typeJason A. Donenfeld
Suggested-by: Andy Lutomirski <luto@kernel.org> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-08-04compat: better atomic acquire/release backportJason A. Donenfeld
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-08-04send: switch handshake stamp to an atomicJason A. Donenfeld
Rather than abusing the handshake lock, we're much better off just using a boring atomic64 for this. It's simpler and performs better. Also, while we're at it, we set the handshake stamp both before and after the calculations, in case the calculations block for a really long time waiting for the RNG to initialize. Otherwise it's possible that when the RNG finally initializes, two handshakes are sent back to back, which isn't sensible. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-08-03version: bump snapshotJason A. Donenfeld
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-08-03allowedips: use different macro names so as to avoid confusionJason A. Donenfeld
A mailing list interlocutor argues that sharing the same macro name might lead to errors down the road. Suggested-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-08-03peer: ensure destruction doesn't raceJason A. Donenfeld
Completely rework peer removal to ensure peers don't jump between contexts and create races. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-08-02noise: free peer references on failureJason A. Donenfeld
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-08-02cookie: returned keypair might disappear if rcu lock not heldJason A. Donenfeld
And in general it's good to prefer dereferencing entry.peer from a handshake object rather than a keypair object, when possible, since keypairs could disappear before their underlying peer. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-08-02queueing: ensure strictly ordered loads and storesJason A. Donenfeld
We don't want a consumer to read plaintext when it's supposed to be reading ciphertext, which means we need to synchronize across cores. Suggested-by: Jann Horn <jann@thejh.net> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-08-01queueing: document double-adding and reference conditionsJason A. Donenfeld
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-08-01peer: ensure resources are freed when creation failsJason A. Donenfeld
And in general tighten up the logic of peer creation. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-08-01queueing: keep reference to peer after setting atomic state bitJason A. Donenfeld
After we atomic_set, the peer is allowed to be freed, which means if we want to continue to reference it, we need to bump the reference count. This was introduced a few commits ago by b713ab0e when implementing some simplification suggestions. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-08-01allowedips: free root inside of RCU callbackJason A. Donenfeld
This reduces the amount of call_rcu invocations considerably. Suggested-by: Stephen Hemminger <stephen@networkplumber.org> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-08-01hashtables: document immediate zeroing semanticsJason A. Donenfeld
Suggested-by: Jann Horn <jann@thejh.net> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-08-01allowedips: avoid window of disappeared peerJann Horn
If a peer is removed, it's possible for a lookup to momentarily return NULL, resulting in needless -ENOKEY returns. Signed-off-by: Jann Horn <jannh@google.com> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-08-01allowedips: prevent double read in krefJason A. Donenfeld
Blocks like: if (node_placement(*trie, key, cidr, bits, &node, lock)) { node->peer = peer; return 0; } May result in a double read when adjusting the refcount, in the highly unlikely case of LTO and an overly smart compiler. While we're at it, replace rcu_assign_pointer(X, NULL); with RCU_INIT_POINTER. Reported-by: Jann Horn <jann@thejh.net> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-07-31chacha20poly1305: selftest: split up test vector constantsJason A. Donenfeld
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-07-31version: bump snapshotJason A. Donenfeld
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-07-31device: adjust commentJason A. Donenfeld
Suggested-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-07-31noise: use hex constant for tai64n offsetJason A. Donenfeld
Suggested-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-07-31main: properly name labelJason A. Donenfeld
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-07-31noise: remove outdated commentJason A. Donenfeld
docs/protocol.md hasn't existed for 3 years. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-07-31send: address of variable is never nullJason A. Donenfeld
Reported-by: Jann Horn <jann@thejh.net> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-07-31peer: simplify rcu reference countsJason A. Donenfeld
Use RCU reference counts only when we must, and otherwise use a more reasonably named function. Reported-by: Jann Horn <jann@thejh.net> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-07-31ratelimiter: prevent init/uninit raceJason A. Donenfeld
Fixes a classic ABA problem that isn't actually reachable because of rtnl_lock, but it's good to be correct anyway. Reported-by: Jann Horn <jann@thejh.net> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-07-31main: add missing chacha20poly1305 headerJason A. Donenfeld
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-07-28curve25519-x86_64: tighten reductions modulo 2^256-38Samuel Neves
At this stage the value if C[4] is at most ((2^256-1) + 38*(2^256-1)) / 2^256 = 38, so there is no need to use a wide multiplication. Change inspired by Andy Polyakov's OpenSSL implementation. Signed-off-by: Samuel Neves <sneves@dei.uc.pt> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-07-28curve25519-x86_64: simplify the final reduction by adding 19 beforehandSamuel Neves
Correctness can be quickly verified with the following z3py script: >>> from z3 import * >>> x = BitVec("x", 256) # any 256-bit value >>> ref = URem(x, 2**255 - 19) # correct value >>> t = Extract(255, 255, x); x &= 2**255 - 1; # btrq $63, %3 >>> u = If(t != 0, BitVecVal(38, 256), BitVecVal(19, 256)) # cmovncl %k5, %k4 >>> x += u # addq %4, %0; adcq $0, %1; adcq $0, %2; adcq $0, %3; >>> t = Extract(255, 255, x); x &= 2**255 - 1; # btrq $63, %3 >>> u = If(t != 0, BitVecVal(0, 256), BitVecVal(19, 256)) # cmovncl %k5, %k4 >>> x -= u # subq %4, %0; sbbq $0, %1; sbbq $0, %2; sbbq $0, %3; >>> prove(x == ref) proved Change inspired by Andy Polyakov's OpenSSL implementation. Signed-off-by: Samuel Neves <sneves@dei.uc.pt> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-07-28curve25519-x86_64: tighten the x25519 assemblySamuel Neves
The wide multiplication by 38 in mul_a24_eltfp25519_1w is redundant: (2^256-1) * 121666 / 2^256 is at most 121665, and therefore a 64-bit multiplication can never overflow. Change inspired by Andy Polyakov's OpenSSL implementation. Signed-off-by: Samuel Neves <sneves@dei.uc.pt> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-07-24qemu: update musl and kernelJason A. Donenfeld
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-07-24qemu: show log if process crashesJason A. Donenfeld
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-07-24receive: check against proper return value typeJason A. Donenfeld
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-07-18version: bump snapshotJason A. Donenfeld
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-07-18recieve: disable NAPI busy pollingThomas Gschwantner
This avoids adding one reference per peer to the napi_hash hashtable, as normally done by netif_napi_add(). Since we potentially could have up to 2^20 peers this would make busy polling very slow globally. This approach is preferable to having only a single napi struct because we get one gro_list per peer, which means packets can be combined nicely even if we have a large number of peers. This is also done by gro_cells_init() in net/core/gro_cells.c . Signed-off-by: Thomas Gschwantner <tharre3@gmail.com> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-07-18device: destroy workqueue before freeing queueJason A. Donenfeld
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-07-12receive: use gro call instead of plain callJason A. Donenfeld
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-07-11receive: account for zero or negative budgetJason A. Donenfeld
Suggested-by: Thomas Gschwantner <tharre3@gmail.com> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-07-08version: bump snapshotJason A. Donenfeld
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-07-08receive: use NAPI on the receive pathJonathan Neuschäfer
Suggested-by: Jason A. Donenfeld <Jason@zx2c4.com> [Jason: fixed up the flushing of the rx_queue in peer_remove] Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-07-06qemu: decide debug kernel based on KERNEL_VERSIONJason A. Donenfeld
If KERNEL_VERSION ends in -debug, then automatically set DEBUG_KERNEL If DEBUG_KERNEL is set, now the debug kernel will be built in a separate directory from the normal kernel, so that it's easy to toggle back and forth. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-07-06qemu: bump default kernel versionJason A. Donenfeld
This fixes DEBUG_KERNEL=yes due to dd275caf4a0d9b219fffe49288b6cc33cd564312 being backported to 4.17.4. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-07-06selftest: ratelimiter: improve chance of success via retryJason A. Donenfeld
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-07-04receive: styleJason A. Donenfeld
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2018-07-04device: print daddr not saddr in missing peer errorJason A. Donenfeld
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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