#ifndef _DCCP_FEAT_H #define _DCCP_FEAT_H /* * net/dccp/feat.h * * Feature negotiation for the DCCP protocol (RFC 4340, section 6) * Copyright (c) 2008 Gerrit Renker * Copyright (c) 2005 Andrea Bittau * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include #include "dccp.h" /* * Known limit values */ /* Ack Ratio takes 2-byte integer values (11.3) */ #define DCCPF_ACK_RATIO_MAX 0xFFFF /* Wmin=32 and Wmax=2^46-1 from 7.5.2 */ #define DCCPF_SEQ_WMIN 32 #define DCCPF_SEQ_WMAX 0x3FFFFFFFFFFFull /* Maximum number of SP values that fit in a single (Confirm) option */ #define DCCP_FEAT_MAX_SP_VALS (DCCP_SINGLE_OPT_MAXLEN - 2) enum dccp_feat_type { FEAT_AT_RX = 1, /* located at RX side of half-connection */ FEAT_AT_TX = 2, /* located at TX side of half-connection */ FEAT_SP = 4, /* server-priority reconciliation (6.3.1) */ FEAT_NN = 8, /* non-negotiable reconciliation (6.3.2) */ FEAT_UNKNOWN = 0xFF /* not understood or invalid feature */ }; enum dccp_feat_state { FEAT_DEFAULT = 0, /* using default values from 6.4 */ FEAT_INITIALISING, /* feature is being initialised */ FEAT_CHANGING, /* Change sent but not confirmed yet */ FEAT_UNSTABLE, /* local modification in state CHANGING */ FEAT_STABLE /* both ends (think they) agree */ }; /** * dccp_feat_val - Container for SP or NN feature values * @nn: single NN value * @sp.vec: single SP value plus optional preference list * @sp.len: length of @sp.vec in bytes */ typedef union { u64 nn; struct { u8 *vec; u8 len; } sp; } dccp_feat_val; /** * struct feat_entry - Data structure to perform feature negotiation * @val: feature's current value (SP features may have preference list) * @state: feature's current state * @feat_num: one of %dccp_feature_numbers * @needs_mandatory: whether Mandatory options should be sent * @needs_confirm: whether to send a Confirm instead of a Change * @empty_confirm: whether to send an empty Confirm (depends on @needs_confirm) * @is_local: feature location (1) or feature-remote (0) * @node: list pointers, entries arranged in FIFO order */ struct dccp_feat_entry { dccp_feat_val val; enum dccp_feat_state state:8; u8 feat_num; bool needs_mandatory, needs_confirm, empty_confirm, is_local; struct list_head node; }; static inline u8 dccp_feat_genopt(struct dccp_feat_entry *entry) { if (entry->needs_confirm) return entry->is_local ? DCCPO_CONFIRM_L : DCCPO_CONFIRM_R; return entry->is_local ? DCCPO_CHANGE_L : DCCPO_CHANGE_R; } /** * struct ccid_dependency - Track changes resulting from choosing a CCID * @dependent_feat: one of %dccp_feature_numbers * @is_local: local (1) or remote (0) @dependent_feat * @is_mandatory: whether presence of @dependent_feat is mission-critical or not * @val: corresponding default value for @dependent_feat (u8 is sufficient here) */ struct ccid_dependency { u8 dependent_feat; bool is_local:1, is_mandatory:1; u8 val; }; /* * Sysctls to seed defaults for feature negotiation */ extern unsigned long sysctl_dccp_sequence_window; extern int sysctl_dccp_rx_ccid; extern int sysctl_dccp_tx_ccid; int dccp_feat_init(struct sock *sk); void dccp_feat_initialise_sysctls(void); int dccp_feat_register_sp(struct sock *sk, u8 feat, u8 is_local, u8 const *list, u8 len); int dccp_feat_parse_options(struct sock *, struct dccp_request_sock *, u8 mand, u8 opt, u8 feat, u8 *val, u8 len); int dccp_feat_clone_list(struct list_head const *, struct list_head *); /* * Encoding variable-length options and their maximum length. * * This affects NN options (SP options are all u8) and other variable-length * options (see table 3 in RFC 4340). The limit is currently given the Sequence * Window NN value (sec. 7.5.2) and the NDP count (sec. 7.7) option, all other * options consume less than 6 bytes (timestamps are 4 bytes). * When updating this constant (e.g. due to new internet drafts / RFCs), make * sure that you also update all code which refers to it. */ #define DCCP_OPTVAL_MAXLEN 6 void dccp_encode_value_var(const u64 value, u8 *to, const u8 len); u64 dccp_decode_value_var(const u8 *bf, const u8 len); u64 dccp_feat_nn_get(struct sock *sk, u8 feat); int dccp_insert_option_mandatory(struct sk_buff *skb); int dccp_insert_fn_opt(struct sk_buff *skb, u8 type, u8 feat, u8 *val, u8 len, bool repeat_first); #endif /* _DCCP_FEAT_H */ Pull networking fixes from David Miller: 1) Fix handling of interrupt status in stmmac driver. Just because we have masked the event from generating interrupts, doesn't mean the bit won't still be set in the interrupt status register. From Alexey Brodkin. 2) Fix DMA API debugging splats in gianfar driver, from Arseny Solokha. 3) Fix off-by-one error in __ip6_append_data(), from Vlad Yasevich. 4) cls_flow does not match on icmpv6 codes properly, from Simon Horman. 5) Initial MAC address can be set incorrectly in some scenerios, from Ivan Vecera. 6) Packet header pointer arithmetic fix in ip6_tnl_parse_tlv_end_lim(), from Dan Carpenter. 7) Fix divide by zero in __tcp_select_window(), from Eric Dumazet. 8) Fix crash in iwlwifi when unregistering thermal zone, from Jens Axboe. 9) Check for DMA mapping errors in starfire driver, from Alexey Khoroshilov. * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (31 commits) tcp: fix 0 divide in __tcp_select_window() ipv6: pointer math error in ip6_tnl_parse_tlv_enc_lim() net: fix ndo_features_check/ndo_fix_features comment ordering net/sched: matchall: Fix configuration race be2net: fix initial MAC setting ipv6: fix flow labels when the traffic class is non-0 net: thunderx: avoid dereferencing xcv when NULL net/sched: cls_flower: Correct matching on ICMPv6 code ipv6: Paritially checksum full MTU frames net/mlx4_core: Avoid command timeouts during VF driver device shutdown gianfar: synchronize DMA API usage by free_skb_rx_queue w/ gfar_new_page net: ethtool: add support for 2500BaseT and 5000BaseT link modes can: bcm: fix hrtimer/tasklet termination in bcm op removal net: adaptec: starfire: add checks for dma mapping errors net: phy: micrel: KSZ8795 do not set SUPPORTED_[Asym_]Pause can: Fix kernel panic at security_sock_rcv_skb net: macb: Fix 64 bit addressing support for GEM stmmac: Discard masked flags in interrupt status register net/mlx5e: Check ets capability before ets query FW command net/mlx5e: Fix update of hash function/key via ethtool ... 2017-02-01tcp: fix 0 divide in __tcp_select_window()Eric Dumazet1-2/+4 syszkaller fuzzer was able to trigger a divide by zero, when TCP window scaling is not enabled. SO_RCVBUF can be used not only to increase sk_rcvbuf, also to decrease it below current receive buffers utilization. If mss is negative or 0, just return a zero TCP window. Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: Dmitry Vyukov <dvyukov@google.com> Acked-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: David S. Miller <davem@davemloft.net> 2017-02-01ipv6: pointer math error in ip6_tnl_parse_tlv_enc_lim()Dan Carpenter1-1/+1 Casting is a high precedence operation but "off" and "i" are in terms of bytes so we need to have some parenthesis here. Fixes: fbfa743a9d2a ("ipv6: fix ip6_tnl_parse_tlv_enc_lim()") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net> 2017-02-01net/sched: matchall: Fix configuration raceYotam Gigi1-82/+45 In the current version, the matchall internal state is split into two structs: cls_matchall_head and cls_matchall_filter. This makes little sense, as matchall instance supports only one filter, and there is no situation where one exists and the other does not. In addition, that led to some races when filter was deleted while packet was processed. Unify that two structs into one, thus simplifying the process of matchall creation and deletion. As a result, the new, delete and get callbacks have a dummy implementation where all the work is done in destroy and change callbacks, as was done in cls_cgroup. Fixes: bf3994d2ed31 ("net/sched: introduce Match-all classifier") Reported-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: Yotam Gigi <yotamg@mellanox.com> Acked-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>