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Also clamp MSS on IPv6

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Some routers erratically drop "Packet too big" icmp messages, and PMTU
discovery then doesn't work. We can however easily clamp MSS on IPv6 too.
This commit is contained in:
Samuel Thibault 2023-11-05 17:21:14 +01:00
parent 7514eecf68
commit 3667bdfe80
3 changed files with 42 additions and 10 deletions
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4
l2tpns.h
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@ -969,7 +969,8 @@ void filter_session(sessionidt s, int filter_in, int filter_out);
void send_garp(in_addr_t ip);
void tunnelsend(uint8_t *buf, uint16_t l, tunnelidt t);
int tun_write(uint8_t *data, int size);
void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp);
void adjust_tcp4_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp);
void adjust_tcp6_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp);
void sendipcp(sessionidt s, tunnelidt t);
void sendipv6cp(sessionidt s, tunnelidt t);
void processudp(uint8_t *buf, int len, struct sockaddr_in *addr, uint16_t indexudpfd);
@ -1054,6 +1055,7 @@ struct event_data {
extern uint16_t MRU;
extern uint16_t MSS;
extern uint16_t MSS6;
// macros for handling help in cli commands
#define CLI_HELP_REQUESTED (argc > 0 && argv[argc-1][strlen(argv[argc-1])-1] == '?')