[sr-dev] [kamailio/kamailio] IMS, P-CSCF: fix issues with UEs and ipsec tunnel (PR #3094)

[Kristiyan Peychev]

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#### Type Of Change
- [ ] Small bug fix (non-breaking change which fixes an issue)
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- [ ] Breaking change (fix or feature that would change existing functionality)

#### Checklist:
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- [ ] PR should be backported to stable branches
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- [ ] Related to issue #XXXX (replace XXXX with an open issue number)

#### Description
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Implement reuse of IPSec tunnels when UEs are re-registering or de-registering, optimizing tunnel creations and key exchanges, and (hopefully) performance. This is a refactored version of PR #3029. I hope that all the issues @alexyosifov found have been fixed.
You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/3094

-- Commit Summary --

  * ims_ipsec_pcscf: fix issues with UEs and ipsec tunnel

-- File Changes --

    M src/modules/ims_ipsec_pcscf/cmd.c (151)
    M src/modules/ims_ipsec_pcscf/ims_ipsec_pcscf_mod.c (12)
    M src/modules/ims_ipsec_pcscf/ipsec.c (29)
    D src/modules/ims_ipsec_pcscf/port_gen.c (227)
    D src/modules/ims_ipsec_pcscf/port_gen.h (41)
    M src/modules/ims_ipsec_pcscf/sec_agree.c (33)
    M src/modules/ims_ipsec_pcscf/spi_gen.c (112)
    M src/modules/ims_ipsec_pcscf/spi_gen.h (6)
    M src/modules/ims_ipsec_pcscf/spi_list.c (62)
    M src/modules/ims_ipsec_pcscf/spi_list.h (12)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/3094.patch
https://github.com/kamailio/kamailio/pull/3094.diff

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