| 1 | // Copyright (C) Microsoft Corporation. All rights reserved. |
| 2 | #pragma once |
| 3 | |
| 4 | #include <functional> |
| 5 | #include "NetlinkChannel.h" |
| 6 | #include "Rule.h" |
| 7 | #include "Operation.h" |
| 8 | |
| 9 | struct RuleMessage |
| 10 | { |
| 11 | rtmsg rule; |
| 12 | utils::IntegerAttribute tableId; |
| 13 | } __attribute__((packed)); |
| 14 | |
| 15 | // The below a means to ensure that messages have a common set of fields. It just means |
| 16 | // that a type T must inherit from RuleMessage, and any functions that reference |
| 17 | // DerivedRuleMessage can be assured that they can safely access the fields in RuleMessage. |
| 18 | template <typename TMessage> |
| 19 | concept DerivedRuleMessage = std::is_base_of<RuleMessage, TMessage>::value; |
| 20 | |
| 21 | class IpRuleManager |
| 22 | { |
| 23 | public: |
| 24 | /* |
| 25 | Implements netlink equivalent of "ip rule <operation> iif <interface> ipproto <protocol> prio <priority> table <table>". |
| 26 | */ |
| 27 | void ModifyLoopbackRule(const Rule& rule, Operation operation); |
| 28 | |
| 29 | /* |
| 30 | Implements netlink equivalent of "ip rule <operation> from <source IP> iif lo ipproto <protocol> prio <priority> table <table>". |
| 31 | */ |
| 32 | void ModifyLoopbackRuleWithSourceAddress(const Rule& rule, Operation operation); |
| 33 | |
| 34 | /* |
| 35 | Implements netlink equivalent of "ip rule <operation> ipproto <protocol> prio <priority> table <table>". |
| 36 | */ |
| 37 | void ModifyRoutingTablePriorityWithProtocol(const Rule& rule, Operation operation); |
| 38 | |
| 39 | /* |
| 40 | Implements netlink equivalent of "ip rule <operation> prio <priority> table <table>". |
| 41 | */ |
| 42 | void ModifyRoutingTablePriority(const Rule& rule, Operation operation); |
| 43 | |
| 44 | /* |
| 45 | Implements netlink equivalent of "ip rule show". |
| 46 | */ |
| 47 | std::vector<Rule> ListRules(int family = AF_INET, int tableId = RT_TABLE_UNSPEC); |
| 48 | |
| 49 | private: |
| 50 | /* |
| 51 | Creates the message using the routine, then sends the message via netlink. |
| 52 | */ |
| 53 | template <DerivedRuleMessage TMessage> |
| 54 | void SendMessage(unsigned char family, int routingTable, int operation, int flags, const std::function<void(TMessage&)>& routine = [](auto&) {}); |
| 55 | |
| 56 | template <typename TAddr> |
| 57 | void ModifyLoopbackRuleWithSourceAddressImpl(const Rule& rule, Operation operation); |
| 58 | |
| 59 | NetlinkChannel m_channel; |
| 60 | }; |