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tcp: add 2 hooks to add custom options to outgoing tcp segments

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Signed-off-by: goldsimon <goldsimon@gmx.de>
This commit is contained in:
goldsimon
2018-01-31 21:59:18 +01:00
parent 77d0ee0961
commit fa9082116f
2 changed files with 122 additions and 43 deletions
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44
src/include/lwip/opt.h
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@@ -2725,6 +2725,50 @@
#define LWIP_HOOK_TCP_INPACKET_PCB(pcb, hdr, optlen, opt1len, opt2, p)
#endif
/**
* LWIP_HOOK_TCP_OUT_TCPOPT_LENGTH:
* Hook for increasing the size of the options allocated with a tcp header.
* Together with LWIP_HOOK_TCP_OUT_ADD_TCPOPTS, this can be used to add custom
* options to outgoing tcp segments.
* Signature:
* u8_t my_hook_tcp_out_tcpopt_length(const struct tcp_pcb *pcb, u8_t internal_option_length);
* Arguments:
* - pcb: tcp_pcb that transmits (ATTENTION: this may be NULL or
* struct tcp_pcb_listen if pcb->state == LISTEN)
* - internal_option_length: tcp option length used by the stack internally
* Return value:
* - a number of bytes to allocate for tcp options (internal_option_length <= ret <= 40)
*
* ATTENTION: don't call any tcp api functions that might change tcp state (pcb
* state or any pcb lists) from this callback!
*/
#ifdef __DOXYGEN__
#define LWIP_HOOK_TCP_OUT_TCPOPT_LENGTH(pcb, internal_len)
#endif
/**
* LWIP_HOOK_TCP_OUT_ADD_TCPOPTS:
* Hook for adding custom options to outgoing tcp segments.
* Space for these custom options has to be reserved via LWIP_HOOK_TCP_OUT_TCPOPT_LENGTH.
* Signature:
* u32_t *my_hook_tcp_out_add_tcpopts(struct pbuf *p, struct tcp_hdr *hdr, const struct tcp_pcb *pcb, u32_t *opts);
* Arguments:
* - p: output packet, p->payload pointing to tcp header, data follows
* - hdr: tcp header
* - pcb: tcp_pcb that transmits (ATTENTION: this may be NULL or
* struct tcp_pcb_listen if pcb->state == LISTEN)
* - opts: pointer where to add the custom options (there may already be options
* between the header and these)
* Return value:
* - pointer pointing directly after the inserted options
*
* ATTENTION: don't call any tcp api functions that might change tcp state (pcb
* state or any pcb lists) from this callback!
*/
#ifdef __DOXYGEN__
#define LWIP_HOOK_TCP_OUT_ADD_TCPOPTS(p, hdr, pcb, opts)
#endif
/**
* LWIP_HOOK_IP4_INPUT(pbuf, input_netif):
* Called from ip_input() (IPv4)